Merge branch 'fix/misc' into topic/misc

320 files changed, 17274 insertions, 6948 deletions

diff --git a/fs/9p/Kconfig b/fs/9p/Kconfig
index 74e0723e90bc..795233702a4e 100644
--- a/fs/9p/Kconfig
+++ b/fs/9p/Kconfig
@@ -8,3 +8,12 @@ config 9P_FS
           See <http://v9fs.sf.net> for more information.
 
           If unsure, say N.
+
+config 9P_FSCACHE
+        bool "Enable 9P client caching support (EXPERIMENTAL)"
+        depends on EXPERIMENTAL
+        depends on 9P_FS=m && FSCACHE || 9P_FS=y && FSCACHE=y
+        help
+          Choose Y here to enable persistent, read-only local
+          caching support for 9p clients using FS-Cache
+
diff --git a/fs/9p/Makefile b/fs/9p/Makefile
index bc7f0d1551e6..1a940ec7af61 100644
--- a/fs/9p/Makefile
+++ b/fs/9p/Makefile
@@ -8,5 +8,6 @@ obj-$(CONFIG_9P_FS) := 9p.o
         vfs_dir.o \
         vfs_dentry.o \
         v9fs.o \
-        fid.o \
+        fid.o
 
+9p-$(CONFIG_9P_FSCACHE) += cache.o
diff --git a/fs/9p/cache.c b/fs/9p/cache.c
new file mode 100644
index 000000000000..51c94e26a346
--- /dev/null
+++ b/fs/9p/cache.c
@@ -0,0 +1,474 @@
+/*
+ * V9FS cache definitions.
+ *
+ *  Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to:
+ *  Free Software Foundation
+ *  51 Franklin Street, Fifth Floor
+ *  Boston, MA  02111-1301  USA
+ *
+ */
+
+#include <linux/jiffies.h>
+#include <linux/file.h>
+#include <linux/stat.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <net/9p/9p.h>
+
+#include "v9fs.h"
+#include "cache.h"
+
+#define CACHETAG_LEN  11
+
+struct kmem_cache *vcookie_cache;
+
+struct fscache_netfs v9fs_cache_netfs = {
+        .name           = "9p",
+        .version        = 0,
+};
+
+static void init_once(void *foo)
+{
+        struct v9fs_cookie *vcookie = (struct v9fs_cookie *) foo;
+        vcookie->fscache = NULL;
+        vcookie->qid = NULL;
+        inode_init_once(&vcookie->inode);
+}
+
+/**
+ * v9fs_init_vcookiecache - initialize a cache for vcookies to maintain
+ *                          vcookie to inode mapping
+ *
+ * Returns 0 on success.
+ */
+
+static int v9fs_init_vcookiecache(void)
+{
+        vcookie_cache = kmem_cache_create("vcookie_cache",
+                                          sizeof(struct v9fs_cookie),
+                                          0, (SLAB_RECLAIM_ACCOUNT|
+                                              SLAB_MEM_SPREAD),
+                                          init_once);
+        if (!vcookie_cache)
+                return -ENOMEM;
+
+        return 0;
+}
+
+/**
+ * v9fs_destroy_vcookiecache - destroy the cache of vcookies
+ *
+ */
+
+static void v9fs_destroy_vcookiecache(void)
+{
+        kmem_cache_destroy(vcookie_cache);
+}
+
+int __v9fs_cache_register(void)
+{
+        int ret;
+        ret = v9fs_init_vcookiecache();
+        if (ret < 0)
+                return ret;
+
+        return fscache_register_netfs(&v9fs_cache_netfs);
+}
+
+void __v9fs_cache_unregister(void)
+{
+        v9fs_destroy_vcookiecache();
+        fscache_unregister_netfs(&v9fs_cache_netfs);
+}
+
+/**
+ * v9fs_random_cachetag - Generate a random tag to be associated
+ *                        with a new cache session.
+ *
+ * The value of jiffies is used for a fairly randomly cache tag.
+ */
+
+static
+int v9fs_random_cachetag(struct v9fs_session_info *v9ses)
+{
+        v9ses->cachetag = kmalloc(CACHETAG_LEN, GFP_KERNEL);
+        if (!v9ses->cachetag)
+                return -ENOMEM;
+
+        return scnprintf(v9ses->cachetag, CACHETAG_LEN, "%lu", jiffies);
+}
+
+static uint16_t v9fs_cache_session_get_key(const void *cookie_netfs_data,
+                                           void *buffer, uint16_t bufmax)
+{
+        struct v9fs_session_info *v9ses;
+        uint16_t klen = 0;
+
+        v9ses = (struct v9fs_session_info *)cookie_netfs_data;
+        P9_DPRINTK(P9_DEBUG_FSC, "session %p buf %p size %u", v9ses,
+                   buffer, bufmax);
+
+        if (v9ses->cachetag)
+                klen = strlen(v9ses->cachetag);
+
+        if (klen > bufmax)
+                return 0;
+
+        memcpy(buffer, v9ses->cachetag, klen);
+        P9_DPRINTK(P9_DEBUG_FSC, "cache session tag %s", v9ses->cachetag);
+        return klen;
+}
+
+const struct fscache_cookie_def v9fs_cache_session_index_def = {
+        .name           = "9P.session",
+        .type           = FSCACHE_COOKIE_TYPE_INDEX,
+        .get_key        = v9fs_cache_session_get_key,
+};
+
+void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses)
+{
+        /* If no cache session tag was specified, we generate a random one. */
+        if (!v9ses->cachetag)
+                v9fs_random_cachetag(v9ses);
+
+        v9ses->fscache = fscache_acquire_cookie(v9fs_cache_netfs.primary_index,
+                                                &v9fs_cache_session_index_def,
+                                                v9ses);
+        P9_DPRINTK(P9_DEBUG_FSC, "session %p get cookie %p", v9ses,
+                   v9ses->fscache);
+}
+
+void v9fs_cache_session_put_cookie(struct v9fs_session_info *v9ses)
+{
+        P9_DPRINTK(P9_DEBUG_FSC, "session %p put cookie %p", v9ses,
+                   v9ses->fscache);
+        fscache_relinquish_cookie(v9ses->fscache, 0);
+        v9ses->fscache = NULL;
+}
+
+
+static uint16_t v9fs_cache_inode_get_key(const void *cookie_netfs_data,
+                                         void *buffer, uint16_t bufmax)
+{
+        const struct v9fs_cookie *vcookie = cookie_netfs_data;
+        memcpy(buffer, &vcookie->qid->path, sizeof(vcookie->qid->path));
+
+        P9_DPRINTK(P9_DEBUG_FSC, "inode %p get key %llu", &vcookie->inode,
+                   vcookie->qid->path);
+        return sizeof(vcookie->qid->path);
+}
+
+static void v9fs_cache_inode_get_attr(const void *cookie_netfs_data,
+                                      uint64_t *size)
+{
+        const struct v9fs_cookie *vcookie = cookie_netfs_data;
+        *size = i_size_read(&vcookie->inode);
+
+        P9_DPRINTK(P9_DEBUG_FSC, "inode %p get attr %llu", &vcookie->inode,
+                   *size);
+}
+
+static uint16_t v9fs_cache_inode_get_aux(const void *cookie_netfs_data,
+                                         void *buffer, uint16_t buflen)
+{
+        const struct v9fs_cookie *vcookie = cookie_netfs_data;
+        memcpy(buffer, &vcookie->qid->version, sizeof(vcookie->qid->version));
+
+        P9_DPRINTK(P9_DEBUG_FSC, "inode %p get aux %u", &vcookie->inode,
+                   vcookie->qid->version);
+        return sizeof(vcookie->qid->version);
+}
+
+static enum
+fscache_checkaux v9fs_cache_inode_check_aux(void *cookie_netfs_data,
+                                            const void *buffer,
+                                            uint16_t buflen)
+{
+        const struct v9fs_cookie *vcookie = cookie_netfs_data;
+
+        if (buflen != sizeof(vcookie->qid->version))
+                return FSCACHE_CHECKAUX_OBSOLETE;
+
+        if (memcmp(buffer, &vcookie->qid->version,
+                   sizeof(vcookie->qid->version)))
+                return FSCACHE_CHECKAUX_OBSOLETE;
+
+        return FSCACHE_CHECKAUX_OKAY;
+}
+
+static void v9fs_cache_inode_now_uncached(void *cookie_netfs_data)
+{
+        struct v9fs_cookie *vcookie = cookie_netfs_data;
+        struct pagevec pvec;
+        pgoff_t first;
+        int loop, nr_pages;
+
+        pagevec_init(&pvec, 0);
+        first = 0;
+
+        for (;;) {
+                nr_pages = pagevec_lookup(&pvec, vcookie->inode.i_mapping,
+                                          first,
+                                          PAGEVEC_SIZE - pagevec_count(&pvec));
+                if (!nr_pages)
+                        break;
+
+                for (loop = 0; loop < nr_pages; loop++)
+                        ClearPageFsCache(pvec.pages[loop]);
+
+                first = pvec.pages[nr_pages - 1]->index + 1;
+
+                pvec.nr = nr_pages;
+                pagevec_release(&pvec);
+                cond_resched();
+        }
+}
+
+const struct fscache_cookie_def v9fs_cache_inode_index_def = {
+        .name           = "9p.inode",
+        .type           = FSCACHE_COOKIE_TYPE_DATAFILE,
+        .get_key        = v9fs_cache_inode_get_key,
+        .get_attr       = v9fs_cache_inode_get_attr,
+        .get_aux        = v9fs_cache_inode_get_aux,
+        .check_aux      = v9fs_cache_inode_check_aux,
+        .now_uncached   = v9fs_cache_inode_now_uncached,
+};
+
+void v9fs_cache_inode_get_cookie(struct inode *inode)
+{
+        struct v9fs_cookie *vcookie;
+        struct v9fs_session_info *v9ses;
+
+        if (!S_ISREG(inode->i_mode))
+                return;
+
+        vcookie = v9fs_inode2cookie(inode);
+        if (vcookie->fscache)
+                return;
+
+        v9ses = v9fs_inode2v9ses(inode);
+        vcookie->fscache = fscache_acquire_cookie(v9ses->fscache,
+                                                  &v9fs_cache_inode_index_def,
+                                                  vcookie);
+
+        P9_DPRINTK(P9_DEBUG_FSC, "inode %p get cookie %p", inode,
+                   vcookie->fscache);
+}
+
+void v9fs_cache_inode_put_cookie(struct inode *inode)
+{
+        struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
+
+        if (!vcookie->fscache)
+                return;
+        P9_DPRINTK(P9_DEBUG_FSC, "inode %p put cookie %p", inode,
+                   vcookie->fscache);
+
+        fscache_relinquish_cookie(vcookie->fscache, 0);
+        vcookie->fscache = NULL;
+}
+
+void v9fs_cache_inode_flush_cookie(struct inode *inode)
+{
+        struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
+
+        if (!vcookie->fscache)
+                return;
+        P9_DPRINTK(P9_DEBUG_FSC, "inode %p flush cookie %p", inode,
+                   vcookie->fscache);
+
+        fscache_relinquish_cookie(vcookie->fscache, 1);
+        vcookie->fscache = NULL;
+}
+
+void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *filp)
+{
+        struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
+        struct p9_fid *fid;
+
+        if (!vcookie->fscache)
+                return;
+
+        spin_lock(&vcookie->lock);
+        fid = filp->private_data;
+        if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
+                v9fs_cache_inode_flush_cookie(inode);
+        else
+                v9fs_cache_inode_get_cookie(inode);
+
+        spin_unlock(&vcookie->lock);
+}
+
+void v9fs_cache_inode_reset_cookie(struct inode *inode)
+{
+        struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
+        struct v9fs_session_info *v9ses;
+        struct fscache_cookie *old;
+
+        if (!vcookie->fscache)
+                return;
+
+        old = vcookie->fscache;
+
+        spin_lock(&vcookie->lock);
+        fscache_relinquish_cookie(vcookie->fscache, 1);
+
+        v9ses = v9fs_inode2v9ses(inode);
+        vcookie->fscache = fscache_acquire_cookie(v9ses->fscache,
+                                                  &v9fs_cache_inode_index_def,
+                                                  vcookie);
+
+        P9_DPRINTK(P9_DEBUG_FSC, "inode %p revalidating cookie old %p new %p",
+                   inode, old, vcookie->fscache);
+
+        spin_unlock(&vcookie->lock);
+}
+
+int __v9fs_fscache_release_page(struct page *page, gfp_t gfp)
+{
+        struct inode *inode = page->mapping->host;
+        struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
+
+        BUG_ON(!vcookie->fscache);
+
+        if (PageFsCache(page)) {
+                if (fscache_check_page_write(vcookie->fscache, page)) {
+                        if (!(gfp & __GFP_WAIT))
+                                return 0;
+                        fscache_wait_on_page_write(vcookie->fscache, page);
+                }
+
+                fscache_uncache_page(vcookie->fscache, page);
+                ClearPageFsCache(page);
+        }
+
+        return 1;
+}
+
+void __v9fs_fscache_invalidate_page(struct page *page)
+{
+        struct inode *inode = page->mapping->host;
+        struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
+
+        BUG_ON(!vcookie->fscache);
+
+        if (PageFsCache(page)) {
+                fscache_wait_on_page_write(vcookie->fscache, page);
+                BUG_ON(!PageLocked(page));
+                fscache_uncache_page(vcookie->fscache, page);
+                ClearPageFsCache(page);
+        }
+}
+
+static void v9fs_vfs_readpage_complete(struct page *page, void *data,
+                                       int error)
+{
+        if (!error)
+                SetPageUptodate(page);
+
+        unlock_page(page);
+}
+
+/**
+ * __v9fs_readpage_from_fscache - read a page from cache
+ *
+ * Returns 0 if the pages are in cache and a BIO is submitted,
+ * 1 if the pages are not in cache and -error otherwise.
+ */
+
+int __v9fs_readpage_from_fscache(struct inode *inode, struct page *page)
+{
+        int ret;
+        const struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
+
+        P9_DPRINTK(P9_DEBUG_FSC, "inode %p page %p", inode, page);
+        if (!vcookie->fscache)
+                return -ENOBUFS;
+
+        ret = fscache_read_or_alloc_page(vcookie->fscache,
+                                         page,
+                                         v9fs_vfs_readpage_complete,
+                                         NULL,
+                                         GFP_KERNEL);
+        switch (ret) {
+        case -ENOBUFS:
+        case -ENODATA:
+                P9_DPRINTK(P9_DEBUG_FSC, "page/inode not in cache %d", ret);
+                return 1;
+        case 0:
+                P9_DPRINTK(P9_DEBUG_FSC, "BIO submitted");
+                return ret;
+        default:
+                P9_DPRINTK(P9_DEBUG_FSC, "ret %d", ret);
+                return ret;
+        }
+}
+
+/**
+ * __v9fs_readpages_from_fscache - read multiple pages from cache
+ *
+ * Returns 0 if the pages are in cache and a BIO is submitted,
+ * 1 if the pages are not in cache and -error otherwise.
+ */
+
+int __v9fs_readpages_from_fscache(struct inode *inode,
+                                  struct address_space *mapping,
+                                  struct list_head *pages,
+                                  unsigned *nr_pages)
+{
+        int ret;
+        const struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
+
+        P9_DPRINTK(P9_DEBUG_FSC, "inode %p pages %u", inode, *nr_pages);
+        if (!vcookie->fscache)
+                return -ENOBUFS;
+
+        ret = fscache_read_or_alloc_pages(vcookie->fscache,
+                                          mapping, pages, nr_pages,
+                                          v9fs_vfs_readpage_complete,
+                                          NULL,
+                                          mapping_gfp_mask(mapping));
+        switch (ret) {
+        case -ENOBUFS:
+        case -ENODATA:
+                P9_DPRINTK(P9_DEBUG_FSC, "pages/inodes not in cache %d", ret);
+                return 1;
+        case 0:
+                BUG_ON(!list_empty(pages));
+                BUG_ON(*nr_pages != 0);
+                P9_DPRINTK(P9_DEBUG_FSC, "BIO submitted");
+                return ret;
+        default:
+                P9_DPRINTK(P9_DEBUG_FSC, "ret %d", ret);
+                return ret;
+        }
+}
+
+/**
+ * __v9fs_readpage_to_fscache - write a page to the cache
+ *
+ */
+
+void __v9fs_readpage_to_fscache(struct inode *inode, struct page *page)
+{
+        int ret;
+        const struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
+
+        P9_DPRINTK(P9_DEBUG_FSC, "inode %p page %p", inode, page);
+        ret = fscache_write_page(vcookie->fscache, page, GFP_KERNEL);
+        P9_DPRINTK(P9_DEBUG_FSC, "ret =  %d", ret);
+        if (ret != 0)
+                v9fs_uncache_page(inode, page);
+}
diff --git a/fs/9p/cache.h b/fs/9p/cache.h
new file mode 100644
index 000000000000..a94192bfaee8
--- /dev/null
+++ b/fs/9p/cache.h
@@ -0,0 +1,176 @@
+/*
+ * V9FS cache definitions.
+ *
+ *  Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to:
+ *  Free Software Foundation
+ *  51 Franklin Street, Fifth Floor
+ *  Boston, MA  02111-1301  USA
+ *
+ */
+
+#ifndef _9P_CACHE_H
+#ifdef CONFIG_9P_FSCACHE
+#include <linux/fscache.h>
+#include <linux/spinlock.h>
+
+extern struct kmem_cache *vcookie_cache;
+
+struct v9fs_cookie {
+        spinlock_t lock;
+        struct inode inode;
+        struct fscache_cookie *fscache;
+        struct p9_qid *qid;
+};
+
+static inline struct v9fs_cookie *v9fs_inode2cookie(const struct inode *inode)
+{
+        return container_of(inode, struct v9fs_cookie, inode);
+}
+
+extern struct fscache_netfs v9fs_cache_netfs;
+extern const struct fscache_cookie_def v9fs_cache_session_index_def;
+extern const struct fscache_cookie_def v9fs_cache_inode_index_def;
+
+extern void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses);
+extern void v9fs_cache_session_put_cookie(struct v9fs_session_info *v9ses);
+
+extern void v9fs_cache_inode_get_cookie(struct inode *inode);
+extern void v9fs_cache_inode_put_cookie(struct inode *inode);
+extern void v9fs_cache_inode_flush_cookie(struct inode *inode);
+extern void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *filp);
+extern void v9fs_cache_inode_reset_cookie(struct inode *inode);
+
+extern int __v9fs_cache_register(void);
+extern void __v9fs_cache_unregister(void);
+
+extern int __v9fs_fscache_release_page(struct page *page, gfp_t gfp);
+extern void __v9fs_fscache_invalidate_page(struct page *page);
+extern int __v9fs_readpage_from_fscache(struct inode *inode,
+                                        struct page *page);
+extern int __v9fs_readpages_from_fscache(struct inode *inode,
+                                         struct address_space *mapping,
+                                         struct list_head *pages,
+                                         unsigned *nr_pages);
+extern void __v9fs_readpage_to_fscache(struct inode *inode, struct page *page);
+
+
+/**
+ * v9fs_cache_register - Register v9fs file system with the cache
+ */
+static inline int v9fs_cache_register(void)
+{
+        return __v9fs_cache_register();
+}
+
+/**
+ * v9fs_cache_unregister - Unregister v9fs from the cache
+ */
+static inline void v9fs_cache_unregister(void)
+{
+        __v9fs_cache_unregister();
+}
+
+static inline int v9fs_fscache_release_page(struct page *page,
+                                            gfp_t gfp)
+{
+        return __v9fs_fscache_release_page(page, gfp);
+}
+
+static inline void v9fs_fscache_invalidate_page(struct page *page)
+{
+        __v9fs_fscache_invalidate_page(page);
+}
+
+static inline int v9fs_readpage_from_fscache(struct inode *inode,
+                                             struct page *page)
+{
+        return __v9fs_readpage_from_fscache(inode, page);
+}
+
+static inline int v9fs_readpages_from_fscache(struct inode *inode,
+                                              struct address_space *mapping,
+                                              struct list_head *pages,
+                                              unsigned *nr_pages)
+{
+        return __v9fs_readpages_from_fscache(inode, mapping, pages,
+                                             nr_pages);
+}
+
+static inline void v9fs_readpage_to_fscache(struct inode *inode,
+                                            struct page *page)
+{
+        if (PageFsCache(page))
+                __v9fs_readpage_to_fscache(inode, page);
+}
+
+static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
+{
+        struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
+        fscache_uncache_page(vcookie->fscache, page);
+        BUG_ON(PageFsCache(page));
+}
+
+static inline void v9fs_vcookie_set_qid(struct inode *inode,
+                                        struct p9_qid *qid)
+{
+        struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
+        spin_lock(&vcookie->lock);
+        vcookie->qid = qid;
+        spin_unlock(&vcookie->lock);
+}
+
+#else /* CONFIG_9P_FSCACHE */
+
+static inline int v9fs_cache_register(void)
+{
+        return 1;
+}
+
+static inline void v9fs_cache_unregister(void) {}
+
+static inline int v9fs_fscache_release_page(struct page *page,
+                                            gfp_t gfp) {
+        return 1;
+}
+
+static inline void v9fs_fscache_invalidate_page(struct page *page) {}
+
+static inline int v9fs_readpage_from_fscache(struct inode *inode,
+                                             struct page *page)
+{
+        return -ENOBUFS;
+}
+
+static inline int v9fs_readpages_from_fscache(struct inode *inode,
+                                              struct address_space *mapping,
+                                              struct list_head *pages,
+                                              unsigned *nr_pages)
+{
+        return -ENOBUFS;
+}
+
+static inline void v9fs_readpage_to_fscache(struct inode *inode,
+                                            struct page *page)
+{}
+
+static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
+{}
+
+static inline void v9fs_vcookie_set_qid(struct inode *inode,
+                                        struct p9_qid *qid)
+{}
+
+#endif /* CONFIG_9P_FSCACHE */
+#endif /* _9P_CACHE_H */
diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index f7003cfac63d..cf62b05e296a 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -34,21 +34,25 @@
 #include <net/9p/transport.h>
 #include "v9fs.h"
 #include "v9fs_vfs.h"
+#include "cache.h"
+
+static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
+static LIST_HEAD(v9fs_sessionlist);
 
 /*
-  * Option Parsing (code inspired by NFS code)
-  *  NOTE: each transport will parse its own options
-  */
+ * Option Parsing (code inspired by NFS code)
+ *  NOTE: each transport will parse its own options
+ */
 
 enum {
         /* Options that take integer arguments */
         Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid,
         /* String options */
-        Opt_uname, Opt_remotename, Opt_trans,
+        Opt_uname, Opt_remotename, Opt_trans, Opt_cache, Opt_cachetag,
         /* Options that take no arguments */
         Opt_nodevmap,
         /* Cache options */
-        Opt_cache_loose,
+        Opt_cache_loose, Opt_fscache,
         /* Access options */
         Opt_access,
         /* Error token */
@@ -63,8 +67,10 @@ static const match_table_t tokens = {
         {Opt_uname, "uname=%s"},
         {Opt_remotename, "aname=%s"},
         {Opt_nodevmap, "nodevmap"},
-        {Opt_cache_loose, "cache=loose"},
+        {Opt_cache, "cache=%s"},
         {Opt_cache_loose, "loose"},
+        {Opt_fscache, "fscache"},
+        {Opt_cachetag, "cachetag=%s"},
         {Opt_access, "access=%s"},
         {Opt_err, NULL}
 };
@@ -89,16 +95,16 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
         v9ses->afid = ~0;
         v9ses->debug = 0;
         v9ses->cache = 0;
+#ifdef CONFIG_9P_FSCACHE
+        v9ses->cachetag = NULL;
+#endif
 
         if (!opts)
                 return 0;
 
         options = kstrdup(opts, GFP_KERNEL);
-        if (!options) {
-                P9_DPRINTK(P9_DEBUG_ERROR,
-                           "failed to allocate copy of option string\n");
-                return -ENOMEM;
-        }
+        if (!options)
+                goto fail_option_alloc;
 
         while ((p = strsep(&options, ",")) != NULL) {
                 int token;
@@ -143,16 +149,33 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
                 case Opt_cache_loose:
                         v9ses->cache = CACHE_LOOSE;
                         break;
+                case Opt_fscache:
+                        v9ses->cache = CACHE_FSCACHE;
+                        break;
+                case Opt_cachetag:
+#ifdef CONFIG_9P_FSCACHE
+                        v9ses->cachetag = match_strdup(&args[0]);
+#endif
+                        break;
+                case Opt_cache:
+                        s = match_strdup(&args[0]);
+                        if (!s)
+                                goto fail_option_alloc;
+
+                        if (strcmp(s, "loose") == 0)
+                                v9ses->cache = CACHE_LOOSE;
+                        else if (strcmp(s, "fscache") == 0)
+                                v9ses->cache = CACHE_FSCACHE;
+                        else
+                                v9ses->cache = CACHE_NONE;
+                        kfree(s);
+                        break;
 
                 case Opt_access:
                         s = match_strdup(&args[0]);
-                        if (!s) {
-                                P9_DPRINTK(P9_DEBUG_ERROR,
-                                           "failed to allocate copy"
-                                           " of option argument\n");
-                                ret = -ENOMEM;
-                                break;
-                        }
+                        if (!s)
+                                goto fail_option_alloc;
+
                         v9ses->flags &= ~V9FS_ACCESS_MASK;
                         if (strcmp(s, "user") == 0)
                                 v9ses->flags |= V9FS_ACCESS_USER;
@@ -173,6 +196,11 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
         }
         kfree(options);
         return ret;
+
+fail_option_alloc:
+        P9_DPRINTK(P9_DEBUG_ERROR,
+                   "failed to allocate copy of option argument\n");
+        return -ENOMEM;
 }
 
 /**
@@ -200,6 +228,10 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
                 return ERR_PTR(-ENOMEM);
         }
 
+        spin_lock(&v9fs_sessionlist_lock);
+        list_add(&v9ses->slist, &v9fs_sessionlist);
+        spin_unlock(&v9fs_sessionlist_lock);
+
         v9ses->flags = V9FS_EXTENDED | V9FS_ACCESS_USER;
         strcpy(v9ses->uname, V9FS_DEFUSER);
         strcpy(v9ses->aname, V9FS_DEFANAME);
@@ -249,6 +281,11 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
         else
                 fid->uid = ~0;
 
+#ifdef CONFIG_9P_FSCACHE
+        /* register the session for caching */
+        v9fs_cache_session_get_cookie(v9ses);
+#endif
+
         return fid;
 
 error:
@@ -268,8 +305,18 @@ void v9fs_session_close(struct v9fs_session_info *v9ses)
                 v9ses->clnt = NULL;
         }
 
+#ifdef CONFIG_9P_FSCACHE
+        if (v9ses->fscache) {
+                v9fs_cache_session_put_cookie(v9ses);
+                kfree(v9ses->cachetag);
+        }
+#endif
         __putname(v9ses->uname);
         __putname(v9ses->aname);
+
+        spin_lock(&v9fs_sessionlist_lock);
+        list_del(&v9ses->slist);
+        spin_unlock(&v9fs_sessionlist_lock);
 }
 
 /**
@@ -286,25 +333,132 @@ void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
 
 extern int v9fs_error_init(void);
 
+static struct kobject *v9fs_kobj;
+
+#ifdef CONFIG_9P_FSCACHE
 /**
- * v9fs_init - Initialize module
+ * caches_show - list caches associated with a session
+ *
+ * Returns the size of buffer written.
+ */
+
+static ssize_t caches_show(struct kobject *kobj,
+                           struct kobj_attribute *attr,
+                           char *buf)
+{
+        ssize_t n = 0, count = 0, limit = PAGE_SIZE;
+        struct v9fs_session_info *v9ses;
+
+        spin_lock(&v9fs_sessionlist_lock);
+        list_for_each_entry(v9ses, &v9fs_sessionlist, slist) {
+                if (v9ses->cachetag) {
+                        n = snprintf(buf, limit, "%s\n", v9ses->cachetag);
+                        if (n < 0) {
+                                count = n;
+                                break;
+                        }
+
+                        count += n;
+                        limit -= n;
+                }
+        }
+
+        spin_unlock(&v9fs_sessionlist_lock);
+        return count;
+}
+
+static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches);
+#endif /* CONFIG_9P_FSCACHE */
+
+static struct attribute *v9fs_attrs[] = {
+#ifdef CONFIG_9P_FSCACHE
+        &v9fs_attr_cache.attr,
+#endif
+        NULL,
+};
+
+static struct attribute_group v9fs_attr_group = {
+        .attrs = v9fs_attrs,
+};
+
+/**
+ * v9fs_sysfs_init - Initialize the v9fs sysfs interface
+ *
+ */
+
+static int v9fs_sysfs_init(void)
+{
+        v9fs_kobj = kobject_create_and_add("9p", fs_kobj);
+        if (!v9fs_kobj)
+                return -ENOMEM;
+
+        if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) {
+                kobject_put(v9fs_kobj);
+                return -ENOMEM;
+        }
+
+        return 0;
+}
+
+/**
+ * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface
+ *
+ */
+
+static void v9fs_sysfs_cleanup(void)
+{
+        sysfs_remove_group(v9fs_kobj, &v9fs_attr_group);
+        kobject_put(v9fs_kobj);
+}
+
+/**
+ * init_v9fs - Initialize module
  *
  */
 
 static int __init init_v9fs(void)
 {
+        int err;
         printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
         /* TODO: Setup list of registered trasnport modules */
-        return register_filesystem(&v9fs_fs_type);
+        err = register_filesystem(&v9fs_fs_type);
+        if (err < 0) {
+                printk(KERN_ERR "Failed to register filesystem\n");
+                return err;
+        }
+
+        err = v9fs_cache_register();
+        if (err < 0) {
+                printk(KERN_ERR "Failed to register v9fs for caching\n");
+                goto out_fs_unreg;
+        }
+
+        err = v9fs_sysfs_init();
+        if (err < 0) {
+                printk(KERN_ERR "Failed to register with sysfs\n");
+                goto out_sysfs_cleanup;
+        }
+
+        return 0;
+
+out_sysfs_cleanup:
+        v9fs_sysfs_cleanup();
+
+out_fs_unreg:
+        unregister_filesystem(&v9fs_fs_type);
+
+        return err;
 }
 
 /**
- * v9fs_init - shutdown module
+ * exit_v9fs - shutdown module
  *
  */
 
 static void __exit exit_v9fs(void)
 {
+        v9fs_sysfs_cleanup();
+        v9fs_cache_unregister();
         unregister_filesystem(&v9fs_fs_type);
 }
 
diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
index 38762bf102a9..019f4ccb70c1 100644
--- a/fs/9p/v9fs.h
+++ b/fs/9p/v9fs.h
@@ -51,6 +51,7 @@ enum p9_session_flags {
 enum p9_cache_modes {
         CACHE_NONE,
         CACHE_LOOSE,
+        CACHE_FSCACHE,
 };
 
 /**
@@ -60,6 +61,8 @@ enum p9_cache_modes {
  * @debug: debug level
  * @afid: authentication handle
  * @cache: cache mode of type &p9_cache_modes
+ * @cachetag: the tag of the cache associated with this session
+ * @fscache: session cookie associated with FS-Cache
  * @options: copy of options string given by user
  * @uname: string user name to mount hierarchy as
  * @aname: mount specifier for remote hierarchy
@@ -68,7 +71,7 @@ enum p9_cache_modes {
  * @dfltgid: default numeric groupid to mount hierarchy as
  * @uid: if %V9FS_ACCESS_SINGLE, the numeric uid which mounted the hierarchy
  * @clnt: reference to 9P network client instantiated for this session
- * @debugfs_dir: reference to debugfs_dir which can be used for add'l debug
+ * @slist: reference to list of registered 9p sessions
  *
  * This structure holds state for each session instance established during
  * a sys_mount() .
@@ -84,6 +87,10 @@ struct v9fs_session_info {
         unsigned short debug;
         unsigned int afid;
         unsigned int cache;
+#ifdef CONFIG_9P_FSCACHE
+        char *cachetag;
+        struct fscache_cookie *fscache;
+#endif
 
         char *uname;            /* user name to mount as */
         char *aname;            /* name of remote hierarchy being mounted */
@@ -92,11 +99,9 @@ struct v9fs_session_info {
         unsigned int dfltgid;   /* default gid for legacy support */
         u32 uid;                /* if ACCESS_SINGLE, the uid that has access */
         struct p9_client *clnt; /* 9p client */
-        struct dentry *debugfs_dir;
+        struct list_head slist; /* list of sessions registered with v9fs */
 };
 
-extern struct dentry *v9fs_debugfs_root;
-
 struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *,
                                                                         char *);
 void v9fs_session_close(struct v9fs_session_info *v9ses);
diff --git a/fs/9p/v9fs_vfs.h b/fs/9p/v9fs_vfs.h
index f0c7de78e205..3a7560e35865 100644
--- a/fs/9p/v9fs_vfs.h
+++ b/fs/9p/v9fs_vfs.h
@@ -44,7 +44,13 @@ extern const struct file_operations v9fs_dir_operations;
 extern const struct dentry_operations v9fs_dentry_operations;
 extern const struct dentry_operations v9fs_cached_dentry_operations;
 
+#ifdef CONFIG_9P_FSCACHE
+struct inode *v9fs_alloc_inode(struct super_block *sb);
+void v9fs_destroy_inode(struct inode *inode);
+#endif
+
 struct inode *v9fs_get_inode(struct super_block *sb, int mode);
+void v9fs_clear_inode(struct inode *inode);
 ino_t v9fs_qid2ino(struct p9_qid *qid);
 void v9fs_stat2inode(struct p9_wstat *, struct inode *, struct super_block *);
 int v9fs_dir_release(struct inode *inode, struct file *filp);
diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c
index 92828281a30b..90e38449f4b3 100644
--- a/fs/9p/vfs_addr.c
+++ b/fs/9p/vfs_addr.c
@@ -38,6 +38,7 @@
 
 #include "v9fs.h"
 #include "v9fs_vfs.h"
+#include "cache.h"
 
 /**
  * v9fs_vfs_readpage - read an entire page in from 9P
@@ -52,18 +53,31 @@ static int v9fs_vfs_readpage(struct file *filp, struct page *page)
         int retval;
         loff_t offset;
         char *buffer;
+        struct inode *inode;
 
+        inode = page->mapping->host;
         P9_DPRINTK(P9_DEBUG_VFS, "\n");
+
+        BUG_ON(!PageLocked(page));
+
+        retval = v9fs_readpage_from_fscache(inode, page);
+        if (retval == 0)
+                return retval;
+
         buffer = kmap(page);
         offset = page_offset(page);
 
         retval = v9fs_file_readn(filp, buffer, NULL, PAGE_CACHE_SIZE, offset);
-        if (retval < 0)
+        if (retval < 0) {
+                v9fs_uncache_page(inode, page);
                 goto done;
+        }
 
         memset(buffer + retval, 0, PAGE_CACHE_SIZE - retval);
         flush_dcache_page(page);
         SetPageUptodate(page);
+
+        v9fs_readpage_to_fscache(inode, page);
         retval = 0;
 
 done:
@@ -72,6 +86,78 @@ done:
         return retval;
 }
 
+/**
+ * v9fs_vfs_readpages - read a set of pages from 9P
+ *
+ * @filp: file being read
+ * @mapping: the address space
+ * @pages: list of pages to read
+ * @nr_pages: count of pages to read
+ *
+ */
+
+static int v9fs_vfs_readpages(struct file *filp, struct address_space *mapping,
+                             struct list_head *pages, unsigned nr_pages)
+{
+        int ret = 0;
+        struct inode *inode;
+
+        inode = mapping->host;
+        P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, filp);
+
+        ret = v9fs_readpages_from_fscache(inode, mapping, pages, &nr_pages);
+        if (ret == 0)
+                return ret;
+
+        ret = read_cache_pages(mapping, pages, (void *)v9fs_vfs_readpage, filp);
+        P9_DPRINTK(P9_DEBUG_VFS, "  = %d\n", ret);
+        return ret;
+}
+
+/**
+ * v9fs_release_page - release the private state associated with a page
+ *
+ * Returns 1 if the page can be released, false otherwise.
+ */
+
+static int v9fs_release_page(struct page *page, gfp_t gfp)
+{
+        if (PagePrivate(page))
+                return 0;
+
+        return v9fs_fscache_release_page(page, gfp);
+}
+
+/**
+ * v9fs_invalidate_page - Invalidate a page completely or partially
+ *
+ * @page: structure to page
+ * @offset: offset in the page
+ */
+
+static void v9fs_invalidate_page(struct page *page, unsigned long offset)
+{
+        if (offset == 0)
+                v9fs_fscache_invalidate_page(page);
+}
+
+/**
+ * v9fs_launder_page - Writeback a dirty page
+ * Since the writes go directly to the server, we simply return a 0
+ * here to indicate success.
+ *
+ * Returns 0 on success.
+ */
+
+static int v9fs_launder_page(struct page *page)
+{
+        return 0;
+}
+
 const struct address_space_operations v9fs_addr_operations = {
       .readpage = v9fs_vfs_readpage,
+      .readpages = v9fs_vfs_readpages,
+      .releasepage = v9fs_release_page,
+      .invalidatepage = v9fs_invalidate_page,
+      .launder_page = v9fs_launder_page,
 };
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index 68bf2af6c389..3902bf43a088 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -32,6 +32,7 @@
 #include <linux/string.h>
 #include <linux/inet.h>
 #include <linux/list.h>
+#include <linux/pagemap.h>
 #include <asm/uaccess.h>
 #include <linux/idr.h>
 #include <net/9p/9p.h>
@@ -40,6 +41,7 @@
 #include "v9fs.h"
 #include "v9fs_vfs.h"
 #include "fid.h"
+#include "cache.h"
 
 static const struct file_operations v9fs_cached_file_operations;
 
@@ -72,7 +74,7 @@ int v9fs_file_open(struct inode *inode, struct file *file)
                         return err;
                 }
                 if (omode & P9_OTRUNC) {
-                        inode->i_size = 0;
+                        i_size_write(inode, 0);
                         inode->i_blocks = 0;
                 }
                 if ((file->f_flags & O_APPEND) && (!v9fs_extended(v9ses)))
@@ -85,6 +87,10 @@ int v9fs_file_open(struct inode *inode, struct file *file)
                 /* enable cached file options */
                 if(file->f_op == &v9fs_file_operations)
                         file->f_op = &v9fs_cached_file_operations;
+
+#ifdef CONFIG_9P_FSCACHE
+                v9fs_cache_inode_set_cookie(inode, file);
+#endif
         }
 
         return 0;
@@ -210,6 +216,7 @@ v9fs_file_write(struct file *filp, const char __user * data,
         struct p9_client *clnt;
         struct inode *inode = filp->f_path.dentry->d_inode;
         int origin = *offset;
+        unsigned long pg_start, pg_end;
 
         P9_DPRINTK(P9_DEBUG_VFS, "data %p count %d offset %x\n", data,
                 (int)count, (int)*offset);
@@ -225,7 +232,7 @@ v9fs_file_write(struct file *filp, const char __user * data,
                 if (count < rsize)
                         rsize = count;
 
-                n = p9_client_write(fid, NULL, data+total, *offset+total,
+                n = p9_client_write(fid, NULL, data+total, origin+total,
                                                                         rsize);
                 if (n <= 0)
                         break;
@@ -234,14 +241,14 @@ v9fs_file_write(struct file *filp, const char __user * data,
         } while (count > 0);
 
         if (total > 0) {
-                invalidate_inode_pages2_range(inode->i_mapping, origin,
-                                                                origin+total);
+                pg_start = origin >> PAGE_CACHE_SHIFT;
+                pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT;
+                if (inode->i_mapping && inode->i_mapping->nrpages)
+                        invalidate_inode_pages2_range(inode->i_mapping,
+                                                      pg_start, pg_end);
                 *offset += total;
-        }
-
-        if (*offset > inode->i_size) {
-                inode->i_size = *offset;
-                inode->i_blocks = (inode->i_size + 512 - 1) >> 9;
+                i_size_write(inode, i_size_read(inode) + total);
+                inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
         }
 
         if (n < 0)
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 06a223d50a81..5947628aefef 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -40,6 +40,7 @@
 #include "v9fs.h"
 #include "v9fs_vfs.h"
 #include "fid.h"
+#include "cache.h"
 
 static const struct inode_operations v9fs_dir_inode_operations;
 static const struct inode_operations v9fs_dir_inode_operations_ext;
@@ -197,6 +198,39 @@ v9fs_blank_wstat(struct p9_wstat *wstat)
         wstat->extension = NULL;
 }
 
+#ifdef CONFIG_9P_FSCACHE
+/**
+ * v9fs_alloc_inode - helper function to allocate an inode
+ * This callback is executed before setting up the inode so that we
+ * can associate a vcookie with each inode.
+ *
+ */
+
+struct inode *v9fs_alloc_inode(struct super_block *sb)
+{
+        struct v9fs_cookie *vcookie;
+        vcookie = (struct v9fs_cookie *)kmem_cache_alloc(vcookie_cache,
+                                                         GFP_KERNEL);
+        if (!vcookie)
+                return NULL;
+
+        vcookie->fscache = NULL;
+        vcookie->qid = NULL;
+        spin_lock_init(&vcookie->lock);
+        return &vcookie->inode;
+}
+
+/**
+ * v9fs_destroy_inode - destroy an inode
+ *
+ */
+
+void v9fs_destroy_inode(struct inode *inode)
+{
+        kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode));
+}
+#endif
+
 /**
  * v9fs_get_inode - helper function to setup an inode
  * @sb: superblock
@@ -326,6 +360,21 @@ error:
 }
 */
 
+
+/**
+ * v9fs_clear_inode - release an inode
+ * @inode: inode to release
+ *
+ */
+void v9fs_clear_inode(struct inode *inode)
+{
+        filemap_fdatawrite(inode->i_mapping);
+
+#ifdef CONFIG_9P_FSCACHE
+        v9fs_cache_inode_put_cookie(inode);
+#endif
+}
+
 /**
  * v9fs_inode_from_fid - populate an inode by issuing a attribute request
  * @v9ses: session information
@@ -356,8 +405,14 @@ v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 
         v9fs_stat2inode(st, ret, sb);
         ret->i_ino = v9fs_qid2ino(&st->qid);
+
+#ifdef CONFIG_9P_FSCACHE
+        v9fs_vcookie_set_qid(ret, &st->qid);
+        v9fs_cache_inode_get_cookie(ret);
+#endif
         p9stat_free(st);
         kfree(st);
+
         return ret;
 
 error:
@@ -751,7 +806,7 @@ v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
         P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
         err = -EPERM;
         v9ses = v9fs_inode2v9ses(dentry->d_inode);
-        if (v9ses->cache == CACHE_LOOSE)
+        if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
                 return simple_getattr(mnt, dentry, stat);
 
         fid = v9fs_fid_lookup(dentry);
@@ -872,10 +927,10 @@ v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
         } else
                 inode->i_rdev = 0;
 
-        inode->i_size = stat->length;
+        i_size_write(inode, stat->length);
 
         /* not real number of blocks, but 512 byte ones ... */
-        inode->i_blocks = (inode->i_size + 512 - 1) >> 9;
+        inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
 }
 
 /**
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index 8961f1a8f668..14a86448572c 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -44,21 +44,9 @@
 #include "v9fs_vfs.h"
 #include "fid.h"
 
-static void v9fs_clear_inode(struct inode *);
 static const struct super_operations v9fs_super_ops;
 
 /**
- * v9fs_clear_inode - release an inode
- * @inode: inode to release
- *
- */
-
-static void v9fs_clear_inode(struct inode *inode)
-{
-        filemap_fdatawrite(inode->i_mapping);
-}
-
-/**
  * v9fs_set_super - set the superblock
  * @s: super block
  * @data: file system specific data
@@ -220,6 +208,10 @@ v9fs_umount_begin(struct super_block *sb)
 }
 
 static const struct super_operations v9fs_super_ops = {
+#ifdef CONFIG_9P_FSCACHE
+        .alloc_inode = v9fs_alloc_inode,
+        .destroy_inode = v9fs_destroy_inode,
+#endif
         .statfs = simple_statfs,
         .clear_inode = v9fs_clear_inode,
         .show_options = generic_show_options,
diff --git a/fs/Kconfig b/fs/Kconfig
index 455aa207e67e..d4bf8caad8d0 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -109,6 +109,7 @@ source "fs/sysfs/Kconfig"
 
 config TMPFS
         bool "Virtual memory file system support (former shm fs)"
+        depends on SHMEM
         help
           Tmpfs is a file system which keeps all files in virtual memory.
 
diff --git a/fs/adfs/inode.c b/fs/adfs/inode.c
index 798cb071d132..3f57ce4bee5d 100644
--- a/fs/adfs/inode.c
+++ b/fs/adfs/inode.c
@@ -19,9 +19,6 @@ static int
 adfs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh,
                int create)
 {
-        if (block < 0)
-                goto abort_negative;
-
         if (!create) {
                 if (block >= inode->i_blocks)
                         goto abort_toobig;
@@ -34,10 +31,6 @@ adfs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh,
         /* don't support allocation of blocks yet */
         return -EIO;
 
-abort_negative:
-        adfs_error(inode->i_sb, "block %d < 0", block);
-        return -EIO;
-
 abort_toobig:
         return 0;
 }
diff --git a/fs/afs/cache.h b/fs/afs/cache.h
deleted file mode 100644
index 5c4f6b499e90..000000000000
--- a/fs/afs/cache.h
+++ /dev/null
@@ -1,12 +0,0 @@
-/* AFS local cache management interface
- *
- * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#include <linux/fscache.h>
diff --git a/fs/afs/flock.c b/fs/afs/flock.c
index 3ff8bdd18fb3..0931bc1325eb 100644
--- a/fs/afs/flock.c
+++ b/fs/afs/flock.c
@@ -21,7 +21,7 @@ static void afs_fl_release_private(struct file_lock *fl);
 static struct workqueue_struct *afs_lock_manager;
 static DEFINE_MUTEX(afs_lock_manager_mutex);
 
-static struct file_lock_operations afs_lock_ops = {
+static const struct file_lock_operations afs_lock_ops = {
         .fl_copy_lock           = afs_fl_copy_lock,
         .fl_release_private     = afs_fl_release_private,
 };
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 106be66dafd2..6ece2a13bf71 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -18,10 +18,10 @@
 #include <linux/key.h>
 #include <linux/workqueue.h>
 #include <linux/sched.h>
+#include <linux/fscache.h>
 
 #include "afs.h"
 #include "afs_vl.h"
-#include "cache.h"
 
 #define AFS_CELL_MAX_ADDRS 15
 
diff --git a/fs/afs/proc.c b/fs/afs/proc.c
index 8630615e57fe..852739d262a9 100644
--- a/fs/afs/proc.c
+++ b/fs/afs/proc.c
@@ -28,7 +28,7 @@ static int afs_proc_cells_show(struct seq_file *m, void *v);
 static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf,
                                     size_t size, loff_t *_pos);
 
-static struct seq_operations afs_proc_cells_ops = {
+static const struct seq_operations afs_proc_cells_ops = {
         .start  = afs_proc_cells_start,
         .next   = afs_proc_cells_next,
         .stop   = afs_proc_cells_stop,
@@ -70,7 +70,7 @@ static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
 static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v);
 static int afs_proc_cell_volumes_show(struct seq_file *m, void *v);
 
-static struct seq_operations afs_proc_cell_volumes_ops = {
+static const struct seq_operations afs_proc_cell_volumes_ops = {
         .start  = afs_proc_cell_volumes_start,
         .next   = afs_proc_cell_volumes_next,
         .stop   = afs_proc_cell_volumes_stop,
@@ -95,7 +95,7 @@ static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
 static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v);
 static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v);
 
-static struct seq_operations afs_proc_cell_vlservers_ops = {
+static const struct seq_operations afs_proc_cell_vlservers_ops = {
         .start  = afs_proc_cell_vlservers_start,
         .next   = afs_proc_cell_vlservers_next,
         .stop   = afs_proc_cell_vlservers_stop,
@@ -119,7 +119,7 @@ static void *afs_proc_cell_servers_next(struct seq_file *p, void *v,
 static void afs_proc_cell_servers_stop(struct seq_file *p, void *v);
 static int afs_proc_cell_servers_show(struct seq_file *m, void *v);
 
-static struct seq_operations afs_proc_cell_servers_ops = {
+static const struct seq_operations afs_proc_cell_servers_ops = {
         .start  = afs_proc_cell_servers_start,
         .next   = afs_proc_cell_servers_next,
         .stop   = afs_proc_cell_servers_stop,
diff --git a/fs/aio.c b/fs/aio.c
index d065b2c3273e..02a2c9340573 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -24,6 +24,7 @@
 #include <linux/file.h>
 #include <linux/mm.h>
 #include <linux/mman.h>
+#include <linux/mmu_context.h>
 #include <linux/slab.h>
 #include <linux/timer.h>
 #include <linux/aio.h>
@@ -34,7 +35,6 @@
 
 #include <asm/kmap_types.h>
 #include <asm/uaccess.h>
-#include <asm/mmu_context.h>
 
 #if DEBUG > 1
 #define dprintk         printk
@@ -78,6 +78,7 @@ static int __init aio_setup(void)
 
         return 0;
 }
+__initcall(aio_setup);
 
 static void aio_free_ring(struct kioctx *ctx)
 {
@@ -380,6 +381,7 @@ ssize_t wait_on_sync_kiocb(struct kiocb *iocb)
         __set_current_state(TASK_RUNNING);
         return iocb->ki_user_data;
 }
+EXPORT_SYMBOL(wait_on_sync_kiocb);
 
 /* exit_aio: called when the last user of mm goes away.  At this point, 
  * there is no way for any new requests to be submited or any of the 
@@ -573,6 +575,7 @@ int aio_put_req(struct kiocb *req)
         spin_unlock_irq(&ctx->ctx_lock);
         return ret;
 }
+EXPORT_SYMBOL(aio_put_req);
 
 static struct kioctx *lookup_ioctx(unsigned long ctx_id)
 {
@@ -595,51 +598,6 @@ static struct kioctx *lookup_ioctx(unsigned long ctx_id)
 }
 
 /*
- * use_mm
- *      Makes the calling kernel thread take on the specified
- *      mm context.
- *      Called by the retry thread execute retries within the
- *      iocb issuer's mm context, so that copy_from/to_user
- *      operations work seamlessly for aio.
- *      (Note: this routine is intended to be called only
- *      from a kernel thread context)
- */
-static void use_mm(struct mm_struct *mm)
-{
-        struct mm_struct *active_mm;
-        struct task_struct *tsk = current;
-
-        task_lock(tsk);
-        active_mm = tsk->active_mm;
-        atomic_inc(&mm->mm_count);
-        tsk->mm = mm;
-        tsk->active_mm = mm;
-        switch_mm(active_mm, mm, tsk);
-        task_unlock(tsk);
-
-        mmdrop(active_mm);
-}
-
-/*
- * unuse_mm
- *      Reverses the effect of use_mm, i.e. releases the
- *      specified mm context which was earlier taken on
- *      by the calling kernel thread
- *      (Note: this routine is intended to be called only
- *      from a kernel thread context)
- */
-static void unuse_mm(struct mm_struct *mm)
-{
-        struct task_struct *tsk = current;
-
-        task_lock(tsk);
-        tsk->mm = NULL;
-        /* active_mm is still 'mm' */
-        enter_lazy_tlb(mm, tsk);
-        task_unlock(tsk);
-}
-
-/*
  * Queue up a kiocb to be retried. Assumes that the kiocb
  * has already been marked as kicked, and places it on
  * the retry run list for the corresponding ioctx, if it
@@ -1037,6 +995,7 @@ put_rq:
         spin_unlock_irqrestore(&ctx->ctx_lock, flags);
         return ret;
 }
+EXPORT_SYMBOL(aio_complete);
 
 /* aio_read_evt
  *      Pull an event off of the ioctx's event ring.  Returns the number of 
@@ -1825,9 +1784,3 @@ SYSCALL_DEFINE5(io_getevents, aio_context_t, ctx_id,
         asmlinkage_protect(5, ret, ctx_id, min_nr, nr, events, timeout);
         return ret;
 }
-
-__initcall(aio_setup);
-
-EXPORT_SYMBOL(aio_complete);
-EXPORT_SYMBOL(aio_put_req);
-EXPORT_SYMBOL(wait_on_sync_kiocb);
diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
index 47d4a01c5393..2ca7a7cafdbf 100644
--- a/fs/anon_inodes.c
+++ b/fs/anon_inodes.c
@@ -8,8 +8,10 @@
  *
  */
 
+#include <linux/cred.h>
 #include <linux/file.h>
 #include <linux/poll.h>
+#include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/fs.h>
@@ -77,28 +79,24 @@ static const struct address_space_operations anon_aops = {
  *
  * Creates a new file by hooking it on a single inode. This is useful for files
  * that do not need to have a full-fledged inode in order to operate correctly.
- * All the files created with anon_inode_getfd() will share a single inode,
+ * All the files created with anon_inode_getfile() will share a single inode,
  * hence saving memory and avoiding code duplication for the file/inode/dentry
- * setup.  Returns new descriptor or -error.
+ * setup.  Returns the newly created file* or an error pointer.
  */
-int anon_inode_getfd(const char *name, const struct file_operations *fops,
-                     void *priv, int flags)
+struct file *anon_inode_getfile(const char *name,
+                                const struct file_operations *fops,
+                                void *priv, int flags)
 {
         struct qstr this;
         struct dentry *dentry;
         struct file *file;
-        int error, fd;
+        int error;
 
         if (IS_ERR(anon_inode_inode))
-                return -ENODEV;
+                return ERR_PTR(-ENODEV);
 
         if (fops->owner && !try_module_get(fops->owner))
-                return -ENOENT;
-
-        error = get_unused_fd_flags(flags);
-        if (error < 0)
-                goto err_module;
-        fd = error;
+                return ERR_PTR(-ENOENT);
 
         /*
          * Link the inode to a directory entry by creating a unique name
@@ -110,7 +108,7 @@ int anon_inode_getfd(const char *name, const struct file_operations *fops,
         this.hash = 0;
         dentry = d_alloc(anon_inode_mnt->mnt_sb->s_root, &this);
         if (!dentry)
-                goto err_put_unused_fd;
+                goto err_module;
 
         /*
          * We know the anon_inode inode count is always greater than zero,
@@ -136,16 +134,54 @@ int anon_inode_getfd(const char *name, const struct file_operations *fops,
         file->f_version = 0;
         file->private_data = priv;
 
+        return file;
+
+err_dput:
+        dput(dentry);
+err_module:
+        module_put(fops->owner);
+        return ERR_PTR(error);
+}
+EXPORT_SYMBOL_GPL(anon_inode_getfile);
+
+/**
+ * anon_inode_getfd - creates a new file instance by hooking it up to an
+ *                    anonymous inode, and a dentry that describe the "class"
+ *                    of the file
+ *
+ * @name:    [in]    name of the "class" of the new file
+ * @fops:    [in]    file operations for the new file
+ * @priv:    [in]    private data for the new file (will be file's private_data)
+ * @flags:   [in]    flags
+ *
+ * Creates a new file by hooking it on a single inode. This is useful for files
+ * that do not need to have a full-fledged inode in order to operate correctly.
+ * All the files created with anon_inode_getfd() will share a single inode,
+ * hence saving memory and avoiding code duplication for the file/inode/dentry
+ * setup.  Returns new descriptor or an error code.
+ */
+int anon_inode_getfd(const char *name, const struct file_operations *fops,
+                     void *priv, int flags)
+{
+        int error, fd;
+        struct file *file;
+
+        error = get_unused_fd_flags(flags);
+        if (error < 0)
+                return error;
+        fd = error;
+
+        file = anon_inode_getfile(name, fops, priv, flags);
+        if (IS_ERR(file)) {
+                error = PTR_ERR(file);
+                goto err_put_unused_fd;
+        }
         fd_install(fd, file);
 
         return fd;
 
-err_dput:
-        dput(dentry);
 err_put_unused_fd:
         put_unused_fd(fd);
-err_module:
-        module_put(fops->owner);
         return error;
 }
 EXPORT_SYMBOL_GPL(anon_inode_getfd);
diff --git a/fs/attr.c b/fs/attr.c
index 9fe1b1bd30a8..96d394bdaddf 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -18,7 +18,7 @@
 /* Taken over from the old code... */
 
 /* POSIX UID/GID verification for setting inode attributes. */
-int inode_change_ok(struct inode *inode, struct iattr *attr)
+int inode_change_ok(const struct inode *inode, struct iattr *attr)
 {
         int retval = -EPERM;
         unsigned int ia_valid = attr->ia_valid;
@@ -60,9 +60,51 @@ fine:
 error:
         return retval;
 }
-
 EXPORT_SYMBOL(inode_change_ok);
 
+/**
+ * inode_newsize_ok - may this inode be truncated to a given size
+ * @inode:      the inode to be truncated
+ * @offset:     the new size to assign to the inode
+ * @Returns:    0 on success, -ve errno on failure
+ *
+ * inode_newsize_ok will check filesystem limits and ulimits to check that the
+ * new inode size is within limits. inode_newsize_ok will also send SIGXFSZ
+ * when necessary. Caller must not proceed with inode size change if failure is
+ * returned. @inode must be a file (not directory), with appropriate
+ * permissions to allow truncate (inode_newsize_ok does NOT check these
+ * conditions).
+ *
+ * inode_newsize_ok must be called with i_mutex held.
+ */
+int inode_newsize_ok(const struct inode *inode, loff_t offset)
+{
+        if (inode->i_size < offset) {
+                unsigned long limit;
+
+                limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
+                if (limit != RLIM_INFINITY && offset > limit)
+                        goto out_sig;
+                if (offset > inode->i_sb->s_maxbytes)
+                        goto out_big;
+        } else {
+                /*
+                 * truncation of in-use swapfiles is disallowed - it would
+                 * cause subsequent swapout to scribble on the now-freed
+                 * blocks.
+                 */
+                if (IS_SWAPFILE(inode))
+                        return -ETXTBSY;
+        }
+
+        return 0;
+out_sig:
+        send_sig(SIGXFSZ, current, 0);
+out_big:
+        return -EFBIG;
+}
+EXPORT_SYMBOL(inode_newsize_ok);
+
 int inode_setattr(struct inode * inode, struct iattr * attr)
 {
         unsigned int ia_valid = attr->ia_valid;
diff --git a/fs/autofs/dirhash.c b/fs/autofs/dirhash.c
index 2316e944a109..e947915109e5 100644
--- a/fs/autofs/dirhash.c
+++ b/fs/autofs/dirhash.c
@@ -90,7 +90,7 @@ struct autofs_dir_ent *autofs_expire(struct super_block *sb,
                         DPRINTK(("autofs: not expirable (not a mounted directory): %s\n", ent->name));
                         continue;
                 }
-                while (d_mountpoint(path.dentry) && follow_down(&path));
+                while (d_mountpoint(path.dentry) && follow_down(&path))
                         ;
                 umount_ok = may_umount(path.mnt);
                 path_put(&path);
diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c
index 615d5496fe0f..33baf27fac78 100644
--- a/fs/befs/linuxvfs.c
+++ b/fs/befs/linuxvfs.c
@@ -737,12 +737,7 @@ befs_put_super(struct super_block *sb)
 {
         kfree(BEFS_SB(sb)->mount_opts.iocharset);
         BEFS_SB(sb)->mount_opts.iocharset = NULL;
-
-        if (BEFS_SB(sb)->nls) {
-                unload_nls(BEFS_SB(sb)->nls);
-                BEFS_SB(sb)->nls = NULL;
-        }
-
+        unload_nls(BEFS_SB(sb)->nls);
         kfree(sb->s_fs_info);
         sb->s_fs_info = NULL;
 }
@@ -842,7 +837,7 @@ befs_fill_super(struct super_block *sb, void *data, int silent)
         sb->s_magic = BEFS_SUPER_MAGIC;
         /* Set real blocksize of fs */
         sb_set_blocksize(sb, (ulong) befs_sb->block_size);
-        sb->s_op = (struct super_operations *) &befs_sops;
+        sb->s_op = &befs_sops;
         root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
         if (IS_ERR(root)) {
                 ret = PTR_ERR(root);
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 7c1e65d54872..b9b3bb51b1e4 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1280,9 +1280,6 @@ static int writenote(struct memelfnote *men, struct file *file,
 #define DUMP_WRITE(addr, nr)    \
         if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
                 goto end_coredump;
-#define DUMP_SEEK(off)  \
-        if (!dump_seek(file, (off))) \
-                goto end_coredump;
 
 static void fill_elf_header(struct elfhdr *elf, int segs,
                             u16 machine, u32 flags, u8 osabi)
@@ -1714,42 +1711,52 @@ struct elf_note_info {
         int numnote;
 };
 
-static int fill_note_info(struct elfhdr *elf, int phdrs,
-                          struct elf_note_info *info,
-                          long signr, struct pt_regs *regs)
+static int elf_note_info_init(struct elf_note_info *info)
 {
-#define NUM_NOTES       6
-        struct list_head *t;
-
-        info->notes = NULL;
-        info->prstatus = NULL;
-        info->psinfo = NULL;
-        info->fpu = NULL;
-#ifdef ELF_CORE_COPY_XFPREGS
-        info->xfpu = NULL;
-#endif
+        memset(info, 0, sizeof(*info));
         INIT_LIST_HEAD(&info->thread_list);
 
-        info->notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote),
-                              GFP_KERNEL);
+        /* Allocate space for six ELF notes */
+        info->notes = kmalloc(6 * sizeof(struct memelfnote), GFP_KERNEL);
         if (!info->notes)
                 return 0;
         info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL);
         if (!info->psinfo)
-                return 0;
+                goto notes_free;
         info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL);
         if (!info->prstatus)
-                return 0;
+                goto psinfo_free;
         info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL);
         if (!info->fpu)
-                return 0;
+                goto prstatus_free;
 #ifdef ELF_CORE_COPY_XFPREGS
         info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL);
         if (!info->xfpu)
-                return 0;
+                goto fpu_free;
+#endif
+        return 1;
+#ifdef ELF_CORE_COPY_XFPREGS
+ fpu_free:
+        kfree(info->fpu);
 #endif
+ prstatus_free:
+        kfree(info->prstatus);
+ psinfo_free:
+        kfree(info->psinfo);
+ notes_free:
+        kfree(info->notes);
+        return 0;
+}
+
+static int fill_note_info(struct elfhdr *elf, int phdrs,
+                          struct elf_note_info *info,
+                          long signr, struct pt_regs *regs)
+{
+        struct list_head *t;
+
+        if (!elf_note_info_init(info))
+                return 0;
 
-        info->thread_status_size = 0;
         if (signr) {
                 struct core_thread *ct;
                 struct elf_thread_status *ets;
@@ -1809,8 +1816,6 @@ static int fill_note_info(struct elfhdr *elf, int phdrs,
 #endif
 
         return 1;
-
-#undef NUM_NOTES
 }
 
 static size_t get_note_info_size(struct elf_note_info *info)
@@ -2016,7 +2021,8 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un
                 goto end_coredump;
 
         /* Align to page */
-        DUMP_SEEK(dataoff - foffset);
+        if (!dump_seek(file, dataoff - foffset))
+                goto end_coredump;
 
         for (vma = first_vma(current, gate_vma); vma != NULL;
                         vma = next_vma(vma, gate_vma)) {
@@ -2027,33 +2033,19 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un
 
                 for (addr = vma->vm_start; addr < end; addr += PAGE_SIZE) {
                         struct page *page;
-                        struct vm_area_struct *tmp_vma;
-
-                        if (get_user_pages(current, current->mm, addr, 1, 0, 1,
-                                                &page, &tmp_vma) <= 0) {
-                                DUMP_SEEK(PAGE_SIZE);
-                        } else {
-                                if (page == ZERO_PAGE(0)) {
-                                        if (!dump_seek(file, PAGE_SIZE)) {
-                                                page_cache_release(page);
-                                                goto end_coredump;
-                                        }
-                                } else {
-                                        void *kaddr;
-                                        flush_cache_page(tmp_vma, addr,
-                                                         page_to_pfn(page));
-                                        kaddr = kmap(page);
-                                        if ((size += PAGE_SIZE) > limit ||
-                                            !dump_write(file, kaddr,
-                                            PAGE_SIZE)) {
-                                                kunmap(page);
-                                                page_cache_release(page);
-                                                goto end_coredump;
-                                        }
-                                        kunmap(page);
-                                }
+                        int stop;
+
+                        page = get_dump_page(addr);
+                        if (page) {
+                                void *kaddr = kmap(page);
+                                stop = ((size += PAGE_SIZE) > limit) ||
+                                        !dump_write(file, kaddr, PAGE_SIZE);
+                                kunmap(page);
                                 page_cache_release(page);
-                        }
+                        } else
+                                stop = !dump_seek(file, PAGE_SIZE);
+                        if (stop)
+                                goto end_coredump;
                 }
         }
 
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index 20fbeced472b..38502c67987c 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -283,20 +283,23 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm,
         }
 
         stack_size = exec_params.stack_size;
-        if (stack_size < interp_params.stack_size)
-                stack_size = interp_params.stack_size;
-
         if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
                 executable_stack = EXSTACK_ENABLE_X;
         else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
                 executable_stack = EXSTACK_DISABLE_X;
-        else if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
-                executable_stack = EXSTACK_ENABLE_X;
-        else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
-                executable_stack = EXSTACK_DISABLE_X;
         else
                 executable_stack = EXSTACK_DEFAULT;
 
+        if (stack_size == 0) {
+                stack_size = interp_params.stack_size;
+                if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
+                        executable_stack = EXSTACK_ENABLE_X;
+                else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
+                        executable_stack = EXSTACK_DISABLE_X;
+                else
+                        executable_stack = EXSTACK_DEFAULT;
+        }
+
         retval = -ENOEXEC;
         if (stack_size == 0)
                 goto error;
@@ -1325,9 +1328,6 @@ static int writenote(struct memelfnote *men, struct file *file)
 #define DUMP_WRITE(addr, nr)    \
         if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
                 goto end_coredump;
-#define DUMP_SEEK(off)  \
-        if (!dump_seek(file, (off))) \
-                goto end_coredump;
 
 static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs)
 {
@@ -1518,6 +1518,7 @@ static int elf_fdpic_dump_segments(struct file *file, size_t *size,
                            unsigned long *limit, unsigned long mm_flags)
 {
         struct vm_area_struct *vma;
+        int err = 0;
 
         for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
                 unsigned long addr;
@@ -1525,43 +1526,26 @@ static int elf_fdpic_dump_segments(struct file *file, size_t *size,
                 if (!maydump(vma, mm_flags))
                         continue;
 
-                for (addr = vma->vm_start;
-                     addr < vma->vm_end;
-                     addr += PAGE_SIZE
-                     ) {
-                        struct vm_area_struct *vma;
-                        struct page *page;
-
-                        if (get_user_pages(current, current->mm, addr, 1, 0, 1,
-                                           &page, &vma) <= 0) {
-                                DUMP_SEEK(file->f_pos + PAGE_SIZE);
-                        }
-                        else if (page == ZERO_PAGE(0)) {
-                                page_cache_release(page);
-                                DUMP_SEEK(file->f_pos + PAGE_SIZE);
-                        }
-                        else {
-                                void *kaddr;
-
-                                flush_cache_page(vma, addr, page_to_pfn(page));
-                                kaddr = kmap(page);
-                                if ((*size += PAGE_SIZE) > *limit ||
-                                    !dump_write(file, kaddr, PAGE_SIZE)
-                                    ) {
-                                        kunmap(page);
-                                        page_cache_release(page);
-                                        return -EIO;
-                                }
+                for (addr = vma->vm_start; addr < vma->vm_end;
+                                                        addr += PAGE_SIZE) {
+                        struct page *page = get_dump_page(addr);
+                        if (page) {
+                                void *kaddr = kmap(page);
+                                *size += PAGE_SIZE;
+                                if (*size > *limit)
+                                        err = -EFBIG;
+                                else if (!dump_write(file, kaddr, PAGE_SIZE))
+                                        err = -EIO;
                                 kunmap(page);
                                 page_cache_release(page);
-                        }
+                        } else if (!dump_seek(file, file->f_pos + PAGE_SIZE))
+                                err = -EFBIG;
+                        if (err)
+                                goto out;
                 }
         }
-
-        return 0;
-
-end_coredump:
-        return -EFBIG;
+out:
+        return err;
 }
 #endif
 
@@ -1802,7 +1786,8 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
                                 goto end_coredump;
         }
 
-        DUMP_SEEK(dataoff);
+        if (!dump_seek(file, dataoff))
+                goto end_coredump;
 
         if (elf_fdpic_dump_segments(file, &size, &limit, mm_flags) < 0)
                 goto end_coredump;
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index e92f229e3c6e..a2796651e756 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -278,8 +278,6 @@ static int decompress_exec(
                 ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
                 if (ret <= 0)
                         break;
-                if (ret >= (unsigned long) -4096)
-                        break;
                 len -= ret;
 
                 strm.next_in = buf;
@@ -335,7 +333,7 @@ calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp)
                                         "(%d != %d)", (unsigned) r, curid, id);
                         goto failed;
                 } else if ( ! p->lib_list[id].loaded &&
-                                load_flat_shared_library(id, p) > (unsigned long) -4096) {
+                                IS_ERR_VALUE(load_flat_shared_library(id, p))) {
                         printk("BINFMT_FLAT: failed to load library %d", id);
                         goto failed;
                 }
@@ -545,7 +543,7 @@ static int load_flat_file(struct linux_binprm * bprm,
                 textpos = do_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC,
                                   MAP_PRIVATE|MAP_EXECUTABLE, 0);
                 up_write(&current->mm->mmap_sem);
-                if (!textpos  || textpos >= (unsigned long) -4096) {
+                if (!textpos || IS_ERR_VALUE(textpos)) {
                         if (!textpos)
                                 textpos = (unsigned long) -ENOMEM;
                         printk("Unable to mmap process text, errno %d\n", (int)-textpos);
@@ -560,7 +558,7 @@ static int load_flat_file(struct linux_binprm * bprm,
                         PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0);
                 up_write(&current->mm->mmap_sem);
 
-                if (realdatastart == 0 || realdatastart >= (unsigned long)-4096) {
+                if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) {
                         if (!realdatastart)
                                 realdatastart = (unsigned long) -ENOMEM;
                         printk("Unable to allocate RAM for process data, errno %d\n",
@@ -587,7 +585,7 @@ static int load_flat_file(struct linux_binprm * bprm,
                         result = bprm->file->f_op->read(bprm->file, (char *) datapos,
                                         data_len + (relocs * sizeof(unsigned long)), &fpos);
                 }
-                if (result >= (unsigned long)-4096) {
+                if (IS_ERR_VALUE(result)) {
                         printk("Unable to read data+bss, errno %d\n", (int)-result);
                         do_munmap(current->mm, textpos, text_len);
                         do_munmap(current->mm, realdatastart, data_len + extra);
@@ -607,7 +605,7 @@ static int load_flat_file(struct linux_binprm * bprm,
                         PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0);
                 up_write(&current->mm->mmap_sem);
 
-                if (!textpos  || textpos >= (unsigned long) -4096) {
+                if (!textpos || IS_ERR_VALUE(textpos)) {
                         if (!textpos)
                                 textpos = (unsigned long) -ENOMEM;
                         printk("Unable to allocate RAM for process text/data, errno %d\n",
@@ -641,7 +639,7 @@ static int load_flat_file(struct linux_binprm * bprm,
                         fpos = 0;
                         result = bprm->file->f_op->read(bprm->file,
                                         (char *) textpos, text_len, &fpos);
-                        if (result < (unsigned long) -4096)
+                        if (!IS_ERR_VALUE(result))
                                 result = decompress_exec(bprm, text_len, (char *) datapos,
                                                  data_len + (relocs * sizeof(unsigned long)), 0);
                 }
@@ -651,13 +649,13 @@ static int load_flat_file(struct linux_binprm * bprm,
                         fpos = 0;
                         result = bprm->file->f_op->read(bprm->file,
                                         (char *) textpos, text_len, &fpos);
-                        if (result < (unsigned long) -4096) {
+                        if (!IS_ERR_VALUE(result)) {
                                 fpos = ntohl(hdr->data_start);
                                 result = bprm->file->f_op->read(bprm->file, (char *) datapos,
                                         data_len + (relocs * sizeof(unsigned long)), &fpos);
                         }
                 }
-                if (result >= (unsigned long)-4096) {
+                if (IS_ERR_VALUE(result)) {
                         printk("Unable to read code+data+bss, errno %d\n",(int)-result);
                         do_munmap(current->mm, textpos, text_len + data_len + extra +
                                 MAX_SHARED_LIBS * sizeof(unsigned long));
@@ -835,7 +833,7 @@ static int load_flat_shared_library(int id, struct lib_info *libs)
 
         res = prepare_binprm(&bprm);
 
-        if (res <= (unsigned long)-4096)
+        if (!IS_ERR_VALUE(res))
                 res = load_flat_file(&bprm, libs, id, NULL);
 
         abort_creds(bprm.cred);
@@ -880,7 +878,7 @@ static int load_flat_binary(struct linux_binprm * bprm, struct pt_regs * regs)
         stack_len += FLAT_DATA_ALIGN - 1;  /* reserve for upcoming alignment */
         
         res = load_flat_file(bprm, &libinfo, 0, &stack_len);
-        if (res > (unsigned long)-4096)
+        if (IS_ERR_VALUE(res))
                 return res;
         
         /* Update data segment pointers for all libraries */
diff --git a/fs/bio.c b/fs/bio.c
index 76738005c8e8..402cb84a92a1 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -249,6 +249,7 @@ void bio_free(struct bio *bio, struct bio_set *bs)
 
         mempool_free(p, bs->bio_pool);
 }
+EXPORT_SYMBOL(bio_free);
 
 void bio_init(struct bio *bio)
 {
@@ -257,6 +258,7 @@ void bio_init(struct bio *bio)
         bio->bi_comp_cpu = -1;
         atomic_set(&bio->bi_cnt, 1);
 }
+EXPORT_SYMBOL(bio_init);
 
 /**
  * bio_alloc_bioset - allocate a bio for I/O
@@ -311,6 +313,7 @@ err_free:
         mempool_free(p, bs->bio_pool);
         return NULL;
 }
+EXPORT_SYMBOL(bio_alloc_bioset);
 
 static void bio_fs_destructor(struct bio *bio)
 {
@@ -337,6 +340,7 @@ struct bio *bio_alloc(gfp_t gfp_mask, int nr_iovecs)
 
         return bio;
 }
+EXPORT_SYMBOL(bio_alloc);
 
 static void bio_kmalloc_destructor(struct bio *bio)
 {
@@ -380,6 +384,7 @@ struct bio *bio_kmalloc(gfp_t gfp_mask, int nr_iovecs)
 
         return bio;
 }
+EXPORT_SYMBOL(bio_kmalloc);
 
 void zero_fill_bio(struct bio *bio)
 {
@@ -416,6 +421,7 @@ void bio_put(struct bio *bio)
                 bio->bi_destructor(bio);
         }
 }
+EXPORT_SYMBOL(bio_put);
 
 inline int bio_phys_segments(struct request_queue *q, struct bio *bio)
 {
@@ -424,6 +430,7 @@ inline int bio_phys_segments(struct request_queue *q, struct bio *bio)
 
         return bio->bi_phys_segments;
 }
+EXPORT_SYMBOL(bio_phys_segments);
 
 /**
  *      __bio_clone     -       clone a bio
@@ -451,6 +458,7 @@ void __bio_clone(struct bio *bio, struct bio *bio_src)
         bio->bi_size = bio_src->bi_size;
         bio->bi_idx = bio_src->bi_idx;
 }
+EXPORT_SYMBOL(__bio_clone);
 
 /**
  *      bio_clone       -       clone a bio
@@ -482,6 +490,7 @@ struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
 
         return b;
 }
+EXPORT_SYMBOL(bio_clone);
 
 /**
  *      bio_get_nr_vecs         - return approx number of vecs
@@ -505,6 +514,7 @@ int bio_get_nr_vecs(struct block_device *bdev)
 
         return nr_pages;
 }
+EXPORT_SYMBOL(bio_get_nr_vecs);
 
 static int __bio_add_page(struct request_queue *q, struct bio *bio, struct page
                           *page, unsigned int len, unsigned int offset,
@@ -635,6 +645,7 @@ int bio_add_pc_page(struct request_queue *q, struct bio *bio, struct page *page,
         return __bio_add_page(q, bio, page, len, offset,
                               queue_max_hw_sectors(q));
 }
+EXPORT_SYMBOL(bio_add_pc_page);
 
 /**
  *      bio_add_page    -       attempt to add page to bio
@@ -655,6 +666,7 @@ int bio_add_page(struct bio *bio, struct page *page, unsigned int len,
         struct request_queue *q = bdev_get_queue(bio->bi_bdev);
         return __bio_add_page(q, bio, page, len, offset, queue_max_sectors(q));
 }
+EXPORT_SYMBOL(bio_add_page);
 
 struct bio_map_data {
         struct bio_vec *iovecs;
@@ -776,6 +788,7 @@ int bio_uncopy_user(struct bio *bio)
         bio_put(bio);
         return ret;
 }
+EXPORT_SYMBOL(bio_uncopy_user);
 
 /**
  *      bio_copy_user_iov       -       copy user data to bio
@@ -920,6 +933,7 @@ struct bio *bio_copy_user(struct request_queue *q, struct rq_map_data *map_data,
 
         return bio_copy_user_iov(q, map_data, &iov, 1, write_to_vm, gfp_mask);
 }
+EXPORT_SYMBOL(bio_copy_user);
 
 static struct bio *__bio_map_user_iov(struct request_queue *q,
                                       struct block_device *bdev,
@@ -1050,6 +1064,7 @@ struct bio *bio_map_user(struct request_queue *q, struct block_device *bdev,
 
         return bio_map_user_iov(q, bdev, &iov, 1, write_to_vm, gfp_mask);
 }
+EXPORT_SYMBOL(bio_map_user);
 
 /**
  *      bio_map_user_iov - map user sg_iovec table into bio
@@ -1117,13 +1132,13 @@ void bio_unmap_user(struct bio *bio)
         __bio_unmap_user(bio);
         bio_put(bio);
 }
+EXPORT_SYMBOL(bio_unmap_user);
 
 static void bio_map_kern_endio(struct bio *bio, int err)
 {
         bio_put(bio);
 }
 
-
 static struct bio *__bio_map_kern(struct request_queue *q, void *data,
                                   unsigned int len, gfp_t gfp_mask)
 {
@@ -1189,6 +1204,7 @@ struct bio *bio_map_kern(struct request_queue *q, void *data, unsigned int len,
         bio_put(bio);
         return ERR_PTR(-EINVAL);
 }
+EXPORT_SYMBOL(bio_map_kern);
 
 static void bio_copy_kern_endio(struct bio *bio, int err)
 {
@@ -1250,6 +1266,7 @@ struct bio *bio_copy_kern(struct request_queue *q, void *data, unsigned int len,
 
         return bio;
 }
+EXPORT_SYMBOL(bio_copy_kern);
 
 /*
  * bio_set_pages_dirty() and bio_check_pages_dirty() are support functions
@@ -1400,6 +1417,7 @@ void bio_endio(struct bio *bio, int error)
         if (bio->bi_end_io)
                 bio->bi_end_io(bio, error);
 }
+EXPORT_SYMBOL(bio_endio);
 
 void bio_pair_release(struct bio_pair *bp)
 {
@@ -1410,6 +1428,7 @@ void bio_pair_release(struct bio_pair *bp)
                 mempool_free(bp, bp->bio2.bi_private);
         }
 }
+EXPORT_SYMBOL(bio_pair_release);
 
 static void bio_pair_end_1(struct bio *bi, int err)
 {
@@ -1477,6 +1496,7 @@ struct bio_pair *bio_split(struct bio *bi, int first_sectors)
 
         return bp;
 }
+EXPORT_SYMBOL(bio_split);
 
 /**
  *      bio_sector_offset - Find hardware sector offset in bio
@@ -1547,6 +1567,7 @@ void bioset_free(struct bio_set *bs)
 
         kfree(bs);
 }
+EXPORT_SYMBOL(bioset_free);
 
 /**
  * bioset_create  - Create a bio_set
@@ -1592,6 +1613,7 @@ bad:
         bioset_free(bs);
         return NULL;
 }
+EXPORT_SYMBOL(bioset_create);
 
 static void __init biovec_init_slabs(void)
 {
@@ -1636,29 +1658,4 @@ static int __init init_bio(void)
 
         return 0;
 }
-
 subsys_initcall(init_bio);
-
-EXPORT_SYMBOL(bio_alloc);
-EXPORT_SYMBOL(bio_kmalloc);
-EXPORT_SYMBOL(bio_put);
-EXPORT_SYMBOL(bio_free);
-EXPORT_SYMBOL(bio_endio);
-EXPORT_SYMBOL(bio_init);
-EXPORT_SYMBOL(__bio_clone);
-EXPORT_SYMBOL(bio_clone);
-EXPORT_SYMBOL(bio_phys_segments);
-EXPORT_SYMBOL(bio_add_page);
-EXPORT_SYMBOL(bio_add_pc_page);
-EXPORT_SYMBOL(bio_get_nr_vecs);
-EXPORT_SYMBOL(bio_map_user);
-EXPORT_SYMBOL(bio_unmap_user);
-EXPORT_SYMBOL(bio_map_kern);
-EXPORT_SYMBOL(bio_copy_kern);
-EXPORT_SYMBOL(bio_pair_release);
-EXPORT_SYMBOL(bio_split);
-EXPORT_SYMBOL(bio_copy_user);
-EXPORT_SYMBOL(bio_uncopy_user);
-EXPORT_SYMBOL(bioset_create);
-EXPORT_SYMBOL(bioset_free);
-EXPORT_SYMBOL(bio_alloc_bioset);
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 71e7e03ac343..9cf4b926f8e4 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -216,8 +216,6 @@ EXPORT_SYMBOL(fsync_bdev);
  * freeze_bdev  --  lock a filesystem and force it into a consistent state
  * @bdev:       blockdevice to lock
  *
- * This takes the block device bd_mount_sem to make sure no new mounts
- * happen on bdev until thaw_bdev() is called.
  * If a superblock is found on this device, we take the s_umount semaphore
  * on it to make sure nobody unmounts until the snapshot creation is done.
  * The reference counter (bd_fsfreeze_count) guarantees that only the last
@@ -232,46 +230,55 @@ struct super_block *freeze_bdev(struct block_device *bdev)
         int error = 0;
 
         mutex_lock(&bdev->bd_fsfreeze_mutex);
-        if (bdev->bd_fsfreeze_count > 0) {
-                bdev->bd_fsfreeze_count++;
+        if (++bdev->bd_fsfreeze_count > 1) {
+                /*
+                 * We don't even need to grab a reference - the first call
+                 * to freeze_bdev grab an active reference and only the last
+                 * thaw_bdev drops it.
+                 */
                 sb = get_super(bdev);
+                drop_super(sb);
                 mutex_unlock(&bdev->bd_fsfreeze_mutex);
                 return sb;
         }
-        bdev->bd_fsfreeze_count++;
-
-        down(&bdev->bd_mount_sem);
-        sb = get_super(bdev);
-        if (sb && !(sb->s_flags & MS_RDONLY)) {
-                sb->s_frozen = SB_FREEZE_WRITE;
-                smp_wmb();
-
-                sync_filesystem(sb);
-
-                sb->s_frozen = SB_FREEZE_TRANS;
-                smp_wmb();
-
-                sync_blockdev(sb->s_bdev);
-
-                if (sb->s_op->freeze_fs) {
-                        error = sb->s_op->freeze_fs(sb);
-                        if (error) {
-                                printk(KERN_ERR
-                                        "VFS:Filesystem freeze failed\n");
-                                sb->s_frozen = SB_UNFROZEN;
-                                drop_super(sb);
-                                up(&bdev->bd_mount_sem);
-                                bdev->bd_fsfreeze_count--;
-                                mutex_unlock(&bdev->bd_fsfreeze_mutex);
-                                return ERR_PTR(error);
-                        }
+
+        sb = get_active_super(bdev);
+        if (!sb)
+                goto out;
+        if (sb->s_flags & MS_RDONLY) {
+                deactivate_locked_super(sb);
+                mutex_unlock(&bdev->bd_fsfreeze_mutex);
+                return sb;
+        }
+
+        sb->s_frozen = SB_FREEZE_WRITE;
+        smp_wmb();
+
+        sync_filesystem(sb);
+
+        sb->s_frozen = SB_FREEZE_TRANS;
+        smp_wmb();
+
+        sync_blockdev(sb->s_bdev);
+
+        if (sb->s_op->freeze_fs) {
+                error = sb->s_op->freeze_fs(sb);
+                if (error) {
+                        printk(KERN_ERR
+                                "VFS:Filesystem freeze failed\n");
+                        sb->s_frozen = SB_UNFROZEN;
+                        deactivate_locked_super(sb);
+                        bdev->bd_fsfreeze_count--;
+                        mutex_unlock(&bdev->bd_fsfreeze_mutex);
+                        return ERR_PTR(error);
                 }
         }
+        up_write(&sb->s_umount);
 
+ out:
         sync_blockdev(bdev);
         mutex_unlock(&bdev->bd_fsfreeze_mutex);
-
-        return sb;      /* thaw_bdev releases s->s_umount and bd_mount_sem */
+        return sb;      /* thaw_bdev releases s->s_umount */
 }
 EXPORT_SYMBOL(freeze_bdev);
 
@@ -284,44 +291,44 @@ EXPORT_SYMBOL(freeze_bdev);
  */
 int thaw_bdev(struct block_device *bdev, struct super_block *sb)
 {
-        int error = 0;
+        int error = -EINVAL;
 
         mutex_lock(&bdev->bd_fsfreeze_mutex);
-        if (!bdev->bd_fsfreeze_count) {
-                mutex_unlock(&bdev->bd_fsfreeze_mutex);
-                return -EINVAL;
-        }
-
-        bdev->bd_fsfreeze_count--;
-        if (bdev->bd_fsfreeze_count > 0) {
-                if (sb)
-                        drop_super(sb);
-                mutex_unlock(&bdev->bd_fsfreeze_mutex);
-                return 0;
-        }
-
-        if (sb) {
-                BUG_ON(sb->s_bdev != bdev);
-                if (!(sb->s_flags & MS_RDONLY)) {
-                        if (sb->s_op->unfreeze_fs) {
-                                error = sb->s_op->unfreeze_fs(sb);
-                                if (error) {
-                                        printk(KERN_ERR
-                                                "VFS:Filesystem thaw failed\n");
-                                        sb->s_frozen = SB_FREEZE_TRANS;
-                                        bdev->bd_fsfreeze_count++;
-                                        mutex_unlock(&bdev->bd_fsfreeze_mutex);
-                                        return error;
-                                }
-                        }
-                        sb->s_frozen = SB_UNFROZEN;
-                        smp_wmb();
-                        wake_up(&sb->s_wait_unfrozen);
+        if (!bdev->bd_fsfreeze_count)
+                goto out_unlock;
+
+        error = 0;
+        if (--bdev->bd_fsfreeze_count > 0)
+                goto out_unlock;
+
+        if (!sb)
+                goto out_unlock;
+
+        BUG_ON(sb->s_bdev != bdev);
+        down_write(&sb->s_umount);
+        if (sb->s_flags & MS_RDONLY)
+                goto out_deactivate;
+
+        if (sb->s_op->unfreeze_fs) {
+                error = sb->s_op->unfreeze_fs(sb);
+                if (error) {
+                        printk(KERN_ERR
+                                "VFS:Filesystem thaw failed\n");
+                        sb->s_frozen = SB_FREEZE_TRANS;
+                        bdev->bd_fsfreeze_count++;
+                        mutex_unlock(&bdev->bd_fsfreeze_mutex);
+                        return error;
                 }
-                drop_super(sb);
         }
 
-        up(&bdev->bd_mount_sem);
+        sb->s_frozen = SB_UNFROZEN;
+        smp_wmb();
+        wake_up(&sb->s_wait_unfrozen);
+
+out_deactivate:
+        if (sb)
+                deactivate_locked_super(sb);
+out_unlock:
         mutex_unlock(&bdev->bd_fsfreeze_mutex);
         return 0;
 }
@@ -430,7 +437,6 @@ static void init_once(void *foo)
 
         memset(bdev, 0, sizeof(*bdev));
         mutex_init(&bdev->bd_mutex);
-        sema_init(&bdev->bd_mount_sem, 1);
         INIT_LIST_HEAD(&bdev->bd_inodes);
         INIT_LIST_HEAD(&bdev->bd_list);
 #ifdef CONFIG_SYSFS
@@ -1114,7 +1120,7 @@ EXPORT_SYMBOL(revalidate_disk);
 int check_disk_change(struct block_device *bdev)
 {
         struct gendisk *disk = bdev->bd_disk;
-        struct block_device_operations * bdops = disk->fops;
+        const struct block_device_operations *bdops = disk->fops;
 
         if (!bdops->media_changed)
                 return 0;
diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c
index f128427b995b..69b355ae7f49 100644
--- a/fs/btrfs/acl.c
+++ b/fs/btrfs/acl.c
@@ -27,7 +27,7 @@
 #include "btrfs_inode.h"
 #include "xattr.h"
 
-#ifdef CONFIG_FS_POSIX_ACL
+#ifdef CONFIG_BTRFS_POSIX_ACL
 
 static struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
 {
@@ -313,7 +313,7 @@ struct xattr_handler btrfs_xattr_acl_access_handler = {
         .set    = btrfs_xattr_acl_access_set,
 };
 
-#else /* CONFIG_FS_POSIX_ACL */
+#else /* CONFIG_BTRFS_POSIX_ACL */
 
 int btrfs_acl_chmod(struct inode *inode)
 {
@@ -325,4 +325,4 @@ int btrfs_init_acl(struct inode *inode, struct inode *dir)
         return 0;
 }
 
-#endif /* CONFIG_FS_POSIX_ACL */
+#endif /* CONFIG_BTRFS_POSIX_ACL */
diff --git a/fs/btrfs/async-thread.c b/fs/btrfs/async-thread.c
index 019e8af449ab..282ca085c2fb 100644
--- a/fs/btrfs/async-thread.c
+++ b/fs/btrfs/async-thread.c
@@ -48,6 +48,9 @@ struct btrfs_worker_thread {
         /* number of things on the pending list */
         atomic_t num_pending;
 
+        /* reference counter for this struct */
+        atomic_t refs;
+
         unsigned long sequence;
 
         /* protects the pending list. */
@@ -71,7 +74,12 @@ static void check_idle_worker(struct btrfs_worker_thread *worker)
                 unsigned long flags;
                 spin_lock_irqsave(&worker->workers->lock, flags);
                 worker->idle = 1;
-                list_move(&worker->worker_list, &worker->workers->idle_list);
+
+                /* the list may be empty if the worker is just starting */
+                if (!list_empty(&worker->worker_list)) {
+                        list_move(&worker->worker_list,
+                                 &worker->workers->idle_list);
+                }
                 spin_unlock_irqrestore(&worker->workers->lock, flags);
         }
 }
@@ -87,23 +95,49 @@ static void check_busy_worker(struct btrfs_worker_thread *worker)
                 unsigned long flags;
                 spin_lock_irqsave(&worker->workers->lock, flags);
                 worker->idle = 0;
-                list_move_tail(&worker->worker_list,
-                               &worker->workers->worker_list);
+
+                if (!list_empty(&worker->worker_list)) {
+                        list_move_tail(&worker->worker_list,
+                                      &worker->workers->worker_list);
+                }
                 spin_unlock_irqrestore(&worker->workers->lock, flags);
         }
 }
 
-static noinline int run_ordered_completions(struct btrfs_workers *workers,
-                                            struct btrfs_work *work)
+static void check_pending_worker_creates(struct btrfs_worker_thread *worker)
 {
+        struct btrfs_workers *workers = worker->workers;
         unsigned long flags;
 
+        rmb();
+        if (!workers->atomic_start_pending)
+                return;
+
+        spin_lock_irqsave(&workers->lock, flags);
+        if (!workers->atomic_start_pending)
+                goto out;
+
+        workers->atomic_start_pending = 0;
+        if (workers->num_workers >= workers->max_workers)
+                goto out;
+
+        spin_unlock_irqrestore(&workers->lock, flags);
+        btrfs_start_workers(workers, 1);
+        return;
+
+out:
+        spin_unlock_irqrestore(&workers->lock, flags);
+}
+
+static noinline int run_ordered_completions(struct btrfs_workers *workers,
+                                            struct btrfs_work *work)
+{
         if (!workers->ordered)
                 return 0;
 
         set_bit(WORK_DONE_BIT, &work->flags);
 
-        spin_lock_irqsave(&workers->lock, flags);
+        spin_lock(&workers->order_lock);
 
         while (1) {
                 if (!list_empty(&workers->prio_order_list)) {
@@ -126,45 +160,118 @@ static noinline int run_ordered_completions(struct btrfs_workers *workers,
                 if (test_and_set_bit(WORK_ORDER_DONE_BIT, &work->flags))
                         break;
 
-                spin_unlock_irqrestore(&workers->lock, flags);
+                spin_unlock(&workers->order_lock);
 
                 work->ordered_func(work);
 
                 /* now take the lock again and call the freeing code */
-                spin_lock_irqsave(&workers->lock, flags);
+                spin_lock(&workers->order_lock);
                 list_del(&work->order_list);
                 work->ordered_free(work);
         }
 
-        spin_unlock_irqrestore(&workers->lock, flags);
+        spin_unlock(&workers->order_lock);
         return 0;
 }
 
+static void put_worker(struct btrfs_worker_thread *worker)
+{
+        if (atomic_dec_and_test(&worker->refs))
+                kfree(worker);
+}
+
+static int try_worker_shutdown(struct btrfs_worker_thread *worker)
+{
+        int freeit = 0;
+
+        spin_lock_irq(&worker->lock);
+        spin_lock(&worker->workers->lock);
+        if (worker->workers->num_workers > 1 &&
+            worker->idle &&
+            !worker->working &&
+            !list_empty(&worker->worker_list) &&
+            list_empty(&worker->prio_pending) &&
+            list_empty(&worker->pending) &&
+            atomic_read(&worker->num_pending) == 0) {
+                freeit = 1;
+                list_del_init(&worker->worker_list);
+                worker->workers->num_workers--;
+        }
+        spin_unlock(&worker->workers->lock);
+        spin_unlock_irq(&worker->lock);
+
+        if (freeit)
+                put_worker(worker);
+        return freeit;
+}
+
+static struct btrfs_work *get_next_work(struct btrfs_worker_thread *worker,
+                                        struct list_head *prio_head,
+                                        struct list_head *head)
+{
+        struct btrfs_work *work = NULL;
+        struct list_head *cur = NULL;
+
+        if(!list_empty(prio_head))
+                cur = prio_head->next;
+
+        smp_mb();
+        if (!list_empty(&worker->prio_pending))
+                goto refill;
+
+        if (!list_empty(head))
+                cur = head->next;
+
+        if (cur)
+                goto out;
+
+refill:
+        spin_lock_irq(&worker->lock);
+        list_splice_tail_init(&worker->prio_pending, prio_head);
+        list_splice_tail_init(&worker->pending, head);
+
+        if (!list_empty(prio_head))
+                cur = prio_head->next;
+        else if (!list_empty(head))
+                cur = head->next;
+        spin_unlock_irq(&worker->lock);
+
+        if (!cur)
+                goto out_fail;
+
+out:
+        work = list_entry(cur, struct btrfs_work, list);
+
+out_fail:
+        return work;
+}
+
 /*
  * main loop for servicing work items
  */
 static int worker_loop(void *arg)
 {
         struct btrfs_worker_thread *worker = arg;
-        struct list_head *cur;
+        struct list_head head;
+        struct list_head prio_head;
         struct btrfs_work *work;
+
+        INIT_LIST_HEAD(&head);
+        INIT_LIST_HEAD(&prio_head);
+
         do {
-                spin_lock_irq(&worker->lock);
-again_locked:
+again:
                 while (1) {
-                        if (!list_empty(&worker->prio_pending))
-                                cur = worker->prio_pending.next;
-                        else if (!list_empty(&worker->pending))
-                                cur = worker->pending.next;
-                        else
+
+
+                        work = get_next_work(worker, &prio_head, &head);
+                        if (!work)
                                 break;
 
-                        work = list_entry(cur, struct btrfs_work, list);
                         list_del(&work->list);
                         clear_bit(WORK_QUEUED_BIT, &work->flags);
 
                         work->worker = worker;
-                        spin_unlock_irq(&worker->lock);
 
                         work->func(work);
 
@@ -175,9 +282,13 @@ again_locked:
                          */
                         run_ordered_completions(worker->workers, work);
 
-                        spin_lock_irq(&worker->lock);
-                        check_idle_worker(worker);
+                        check_pending_worker_creates(worker);
+
                 }
+
+                spin_lock_irq(&worker->lock);
+                check_idle_worker(worker);
+
                 if (freezing(current)) {
                         worker->working = 0;
                         spin_unlock_irq(&worker->lock);
@@ -216,8 +327,10 @@ again_locked:
                                 spin_lock_irq(&worker->lock);
                                 set_current_state(TASK_INTERRUPTIBLE);
                                 if (!list_empty(&worker->pending) ||
-                                    !list_empty(&worker->prio_pending))
-                                        goto again_locked;
+                                    !list_empty(&worker->prio_pending)) {
+                                        spin_unlock_irq(&worker->lock);
+                                        goto again;
+                                }
 
                                 /*
                                  * this makes sure we get a wakeup when someone
@@ -226,8 +339,13 @@ again_locked:
                                 worker->working = 0;
                                 spin_unlock_irq(&worker->lock);
 
-                                if (!kthread_should_stop())
-                                        schedule();
+                                if (!kthread_should_stop()) {
+                                        schedule_timeout(HZ * 120);
+                                        if (!worker->working &&
+                                            try_worker_shutdown(worker)) {
+                                                return 0;
+                                        }
+                                }
                         }
                         __set_current_state(TASK_RUNNING);
                 }
@@ -242,16 +360,30 @@ int btrfs_stop_workers(struct btrfs_workers *workers)
 {
         struct list_head *cur;
         struct btrfs_worker_thread *worker;
+        int can_stop;
 
+        spin_lock_irq(&workers->lock);
         list_splice_init(&workers->idle_list, &workers->worker_list);
         while (!list_empty(&workers->worker_list)) {
                 cur = workers->worker_list.next;
                 worker = list_entry(cur, struct btrfs_worker_thread,
                                     worker_list);
-                kthread_stop(worker->task);
-                list_del(&worker->worker_list);
-                kfree(worker);
+
+                atomic_inc(&worker->refs);
+                workers->num_workers -= 1;
+                if (!list_empty(&worker->worker_list)) {
+                        list_del_init(&worker->worker_list);
+                        put_worker(worker);
+                        can_stop = 1;
+                } else
+                        can_stop = 0;
+                spin_unlock_irq(&workers->lock);
+                if (can_stop)
+                        kthread_stop(worker->task);
+                spin_lock_irq(&workers->lock);
+                put_worker(worker);
         }
+        spin_unlock_irq(&workers->lock);
         return 0;
 }
 
@@ -266,10 +398,13 @@ void btrfs_init_workers(struct btrfs_workers *workers, char *name, int max)
         INIT_LIST_HEAD(&workers->order_list);
         INIT_LIST_HEAD(&workers->prio_order_list);
         spin_lock_init(&workers->lock);
+        spin_lock_init(&workers->order_lock);
         workers->max_workers = max;
         workers->idle_thresh = 32;
         workers->name = name;
         workers->ordered = 0;
+        workers->atomic_start_pending = 0;
+        workers->atomic_worker_start = 0;
 }
 
 /*
@@ -293,7 +428,9 @@ int btrfs_start_workers(struct btrfs_workers *workers, int num_workers)
                 INIT_LIST_HEAD(&worker->prio_pending);
                 INIT_LIST_HEAD(&worker->worker_list);
                 spin_lock_init(&worker->lock);
+
                 atomic_set(&worker->num_pending, 0);
+                atomic_set(&worker->refs, 1);
                 worker->workers = workers;
                 worker->task = kthread_run(worker_loop, worker,
                                            "btrfs-%s-%d", workers->name,
@@ -303,7 +440,6 @@ int btrfs_start_workers(struct btrfs_workers *workers, int num_workers)
                         kfree(worker);
                         goto fail;
                 }
-
                 spin_lock_irq(&workers->lock);
                 list_add_tail(&worker->worker_list, &workers->idle_list);
                 worker->idle = 1;
@@ -350,7 +486,6 @@ static struct btrfs_worker_thread *next_worker(struct btrfs_workers *workers)
          */
         next = workers->worker_list.next;
         worker = list_entry(next, struct btrfs_worker_thread, worker_list);
-        atomic_inc(&worker->num_pending);
         worker->sequence++;
 
         if (worker->sequence % workers->idle_thresh == 0)
@@ -367,28 +502,18 @@ static struct btrfs_worker_thread *find_worker(struct btrfs_workers *workers)
 {
         struct btrfs_worker_thread *worker;
         unsigned long flags;
+        struct list_head *fallback;
 
 again:
         spin_lock_irqsave(&workers->lock, flags);
         worker = next_worker(workers);
-        spin_unlock_irqrestore(&workers->lock, flags);
 
         if (!worker) {
-                spin_lock_irqsave(&workers->lock, flags);
                 if (workers->num_workers >= workers->max_workers) {
-                        struct list_head *fallback = NULL;
-                        /*
-                         * we have failed to find any workers, just
-                         * return the force one
-                         */
-                        if (!list_empty(&workers->worker_list))
-                                fallback = workers->worker_list.next;
-                        if (!list_empty(&workers->idle_list))
-                                fallback = workers->idle_list.next;
-                        BUG_ON(!fallback);
-                        worker = list_entry(fallback,
-                                  struct btrfs_worker_thread, worker_list);
-                        spin_unlock_irqrestore(&workers->lock, flags);
+                        goto fallback;
+                } else if (workers->atomic_worker_start) {
+                        workers->atomic_start_pending = 1;
+                        goto fallback;
                 } else {
                         spin_unlock_irqrestore(&workers->lock, flags);
                         /* we're below the limit, start another worker */
@@ -396,6 +521,28 @@ again:
                         goto again;
                 }
         }
+        goto found;
+
+fallback:
+        fallback = NULL;
+        /*
+         * we have failed to find any workers, just
+         * return the first one we can find.
+         */
+        if (!list_empty(&workers->worker_list))
+                fallback = workers->worker_list.next;
+        if (!list_empty(&workers->idle_list))
+                fallback = workers->idle_list.next;
+        BUG_ON(!fallback);
+        worker = list_entry(fallback,
+                  struct btrfs_worker_thread, worker_list);
+found:
+        /*
+         * this makes sure the worker doesn't exit before it is placed
+         * onto a busy/idle list
+         */
+        atomic_inc(&worker->num_pending);
+        spin_unlock_irqrestore(&workers->lock, flags);
         return worker;
 }
 
@@ -427,7 +574,7 @@ int btrfs_requeue_work(struct btrfs_work *work)
                 spin_lock(&worker->workers->lock);
                 worker->idle = 0;
                 list_move_tail(&worker->worker_list,
-                               &worker->workers->worker_list);
+                              &worker->workers->worker_list);
                 spin_unlock(&worker->workers->lock);
         }
         if (!worker->working) {
@@ -435,9 +582,9 @@ int btrfs_requeue_work(struct btrfs_work *work)
                 worker->working = 1;
         }
 
-        spin_unlock_irqrestore(&worker->lock, flags);
         if (wake)
                 wake_up_process(worker->task);
+        spin_unlock_irqrestore(&worker->lock, flags);
 out:
 
         return 0;
@@ -463,14 +610,18 @@ int btrfs_queue_worker(struct btrfs_workers *workers, struct btrfs_work *work)
 
         worker = find_worker(workers);
         if (workers->ordered) {
-                spin_lock_irqsave(&workers->lock, flags);
+                /*
+                 * you're not allowed to do ordered queues from an
+                 * interrupt handler
+                 */
+                spin_lock(&workers->order_lock);
                 if (test_bit(WORK_HIGH_PRIO_BIT, &work->flags)) {
                         list_add_tail(&work->order_list,
                                       &workers->prio_order_list);
                 } else {
                         list_add_tail(&work->order_list, &workers->order_list);
                 }
-                spin_unlock_irqrestore(&workers->lock, flags);
+                spin_unlock(&workers->order_lock);
         } else {
                 INIT_LIST_HEAD(&work->order_list);
         }
@@ -481,7 +632,6 @@ int btrfs_queue_worker(struct btrfs_workers *workers, struct btrfs_work *work)
                 list_add_tail(&work->list, &worker->prio_pending);
         else
                 list_add_tail(&work->list, &worker->pending);
-        atomic_inc(&worker->num_pending);
         check_busy_worker(worker);
 
         /*
@@ -492,10 +642,10 @@ int btrfs_queue_worker(struct btrfs_workers *workers, struct btrfs_work *work)
                 wake = 1;
         worker->working = 1;
 
-        spin_unlock_irqrestore(&worker->lock, flags);
-
         if (wake)
                 wake_up_process(worker->task);
+        spin_unlock_irqrestore(&worker->lock, flags);
+
 out:
         return 0;
 }
diff --git a/fs/btrfs/async-thread.h b/fs/btrfs/async-thread.h
index 1b511c109db6..fc089b95ec14 100644
--- a/fs/btrfs/async-thread.h
+++ b/fs/btrfs/async-thread.h
@@ -73,6 +73,15 @@ struct btrfs_workers {
         /* force completions in the order they were queued */
         int ordered;
 
+        /* more workers required, but in an interrupt handler */
+        int atomic_start_pending;
+
+        /*
+         * are we allowed to sleep while starting workers or are we required
+         * to start them at a later time?
+         */
+        int atomic_worker_start;
+
         /* list with all the work threads.  The workers on the idle thread
          * may be actively servicing jobs, but they haven't yet hit the
          * idle thresh limit above.
@@ -90,6 +99,9 @@ struct btrfs_workers {
         /* lock for finding the next worker thread to queue on */
         spinlock_t lock;
 
+        /* lock for the ordered lists */
+        spinlock_t order_lock;
+
         /* extra name for this worker, used for current->name */
         char *name;
 };
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index ea1ea0af8c0e..a54d354cefcb 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -128,6 +128,14 @@ struct btrfs_inode {
         u64 last_unlink_trans;
 
         /*
+         * These two counters are for delalloc metadata reservations.  We keep
+         * track of how many extents we've accounted for vs how many extents we
+         * have.
+         */
+        int delalloc_reserved_extents;
+        int delalloc_extents;
+
+        /*
          * ordered_data_close is set by truncate when a file that used
          * to have good data has been truncated to zero.  When it is set
          * the btrfs file release call will add this inode to the
@@ -138,6 +146,7 @@ struct btrfs_inode {
          * of these.
          */
         unsigned ordered_data_close:1;
+        unsigned dummy_inode:1;
 
         struct inode vfs_inode;
 };
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 9d8ba4d54a37..a11a32058b50 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -506,10 +506,10 @@ static noinline int add_ra_bio_pages(struct inode *inode,
                  */
                 set_page_extent_mapped(page);
                 lock_extent(tree, last_offset, end, GFP_NOFS);
-                spin_lock(&em_tree->lock);
+                read_lock(&em_tree->lock);
                 em = lookup_extent_mapping(em_tree, last_offset,
                                            PAGE_CACHE_SIZE);
-                spin_unlock(&em_tree->lock);
+                read_unlock(&em_tree->lock);
 
                 if (!em || last_offset < em->start ||
                     (last_offset + PAGE_CACHE_SIZE > extent_map_end(em)) ||
@@ -593,11 +593,11 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
         em_tree = &BTRFS_I(inode)->extent_tree;
 
         /* we need the actual starting offset of this extent in the file */
-        spin_lock(&em_tree->lock);
+        read_lock(&em_tree->lock);
         em = lookup_extent_mapping(em_tree,
                                    page_offset(bio->bi_io_vec->bv_page),
                                    PAGE_CACHE_SIZE);
-        spin_unlock(&em_tree->lock);
+        read_unlock(&em_tree->lock);
 
         compressed_len = em->block_len;
         cb = kmalloc(compressed_bio_size(root, compressed_len), GFP_NOFS);
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 3fdcc0512d3a..ec96f3a6d536 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -2853,6 +2853,12 @@ static noinline int split_leaf(struct btrfs_trans_handle *trans,
         int split;
         int num_doubles = 0;
 
+        l = path->nodes[0];
+        slot = path->slots[0];
+        if (extend && data_size + btrfs_item_size_nr(l, slot) +
+            sizeof(struct btrfs_item) > BTRFS_LEAF_DATA_SIZE(root))
+                return -EOVERFLOW;
+
         /* first try to make some room by pushing left and right */
         if (data_size && ins_key->type != BTRFS_DIR_ITEM_KEY) {
                 wret = push_leaf_right(trans, root, path, data_size, 0);
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 837435ce84ca..dd8ced9814c4 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -114,6 +114,10 @@ struct btrfs_ordered_sum;
  */
 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
 
+#define BTRFS_BTREE_INODE_OBJECTID 1
+
+#define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
+
 /*
  * we can actually store much bigger names, but lets not confuse the rest
  * of linux
@@ -670,18 +674,20 @@ struct btrfs_space_info {
         u64 bytes_reserved;     /* total bytes the allocator has reserved for
                                    current allocations */
         u64 bytes_readonly;     /* total bytes that are read only */
-
-        /* delalloc accounting */
-        u64 bytes_delalloc;     /* number of bytes reserved for allocation,
-                                   this space is not necessarily reserved yet
-                                   by the allocator */
+        u64 bytes_super;        /* total bytes reserved for the super blocks */
+        u64 bytes_root;         /* the number of bytes needed to commit a
+                                   transaction */
         u64 bytes_may_use;      /* number of bytes that may be used for
-                                   delalloc */
+                                   delalloc/allocations */
+        u64 bytes_delalloc;     /* number of bytes currently reserved for
+                                   delayed allocation */
 
         int full;               /* indicates that we cannot allocate any more
                                    chunks for this space */
         int force_alloc;        /* set if we need to force a chunk alloc for
                                    this space */
+        int force_delalloc;     /* make people start doing filemap_flush until
+                                   we're under a threshold */
 
         struct list_head list;
 
@@ -690,6 +696,9 @@ struct btrfs_space_info {
         spinlock_t lock;
         struct rw_semaphore groups_sem;
         atomic_t caching_threads;
+
+        int allocating_chunk;
+        wait_queue_head_t wait;
 };
 
 /*
@@ -726,6 +735,15 @@ enum btrfs_caching_type {
         BTRFS_CACHE_FINISHED    = 2,
 };
 
+struct btrfs_caching_control {
+        struct list_head list;
+        struct mutex mutex;
+        wait_queue_head_t wait;
+        struct btrfs_block_group_cache *block_group;
+        u64 progress;
+        atomic_t count;
+};
+
 struct btrfs_block_group_cache {
         struct btrfs_key key;
         struct btrfs_block_group_item item;
@@ -733,6 +751,7 @@ struct btrfs_block_group_cache {
         spinlock_t lock;
         u64 pinned;
         u64 reserved;
+        u64 bytes_super;
         u64 flags;
         u64 sectorsize;
         int extents_thresh;
@@ -742,8 +761,9 @@ struct btrfs_block_group_cache {
         int dirty;
 
         /* cache tracking stuff */
-        wait_queue_head_t caching_q;
         int cached;
+        struct btrfs_caching_control *caching_ctl;
+        u64 last_byte_to_unpin;
 
         struct btrfs_space_info *space_info;
 
@@ -782,13 +802,16 @@ struct btrfs_fs_info {
 
         /* the log root tree is a directory of all the other log roots */
         struct btrfs_root *log_root_tree;
+
+        spinlock_t fs_roots_radix_lock;
         struct radix_tree_root fs_roots_radix;
 
         /* block group cache stuff */
         spinlock_t block_group_cache_lock;
         struct rb_root block_group_cache_tree;
 
-        struct extent_io_tree pinned_extents;
+        struct extent_io_tree freed_extents[2];
+        struct extent_io_tree *pinned_extents;
 
         /* logical->physical extent mapping */
         struct btrfs_mapping_tree mapping_tree;
@@ -822,11 +845,7 @@ struct btrfs_fs_info {
         struct mutex transaction_kthread_mutex;
         struct mutex cleaner_mutex;
         struct mutex chunk_mutex;
-        struct mutex drop_mutex;
         struct mutex volume_mutex;
-        struct mutex tree_reloc_mutex;
-        struct rw_semaphore extent_commit_sem;
-
         /*
          * this protects the ordered operations list only while we are
          * processing all of the entries on it.  This way we make
@@ -835,10 +854,16 @@ struct btrfs_fs_info {
          * before jumping into the main commit.
          */
         struct mutex ordered_operations_mutex;
+        struct rw_semaphore extent_commit_sem;
+
+        struct rw_semaphore subvol_sem;
+
+        struct srcu_struct subvol_srcu;
 
         struct list_head trans_list;
         struct list_head hashers;
         struct list_head dead_roots;
+        struct list_head caching_block_groups;
 
         atomic_t nr_async_submits;
         atomic_t async_submit_draining;
@@ -996,10 +1021,12 @@ struct btrfs_root {
         u32 stripesize;
 
         u32 type;
-        u64 highest_inode;
-        u64 last_inode_alloc;
+
+        u64 highest_objectid;
         int ref_cows;
         int track_dirty;
+        int in_radix;
+
         u64 defrag_trans_start;
         struct btrfs_key defrag_progress;
         struct btrfs_key defrag_max;
@@ -1920,8 +1947,8 @@ void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
                            struct btrfs_root *root, unsigned long count);
 int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
-int btrfs_update_pinned_extents(struct btrfs_root *root,
-                                u64 bytenr, u64 num, int pin);
+int btrfs_pin_extent(struct btrfs_root *root,
+                     u64 bytenr, u64 num, int reserved);
 int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans,
                         struct btrfs_root *root, struct extent_buffer *leaf);
 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
@@ -1971,9 +1998,10 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans,
                       u64 root_objectid, u64 owner, u64 offset);
 
 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len);
+int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
+                                struct btrfs_root *root);
 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
-                               struct btrfs_root *root,
-                               struct extent_io_tree *unpin);
+                               struct btrfs_root *root);
 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
                          struct btrfs_root *root,
                          u64 bytenr, u64 num_bytes, u64 parent,
@@ -1984,6 +2012,7 @@ int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
 int btrfs_free_block_groups(struct btrfs_fs_info *info);
 int btrfs_read_block_groups(struct btrfs_root *root);
+int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr);
 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
                            struct btrfs_root *root, u64 bytes_used,
                            u64 type, u64 chunk_objectid, u64 chunk_offset,
@@ -1997,7 +2026,12 @@ u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
 void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde);
 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
 
-int btrfs_check_metadata_free_space(struct btrfs_root *root);
+int btrfs_reserve_metadata_space(struct btrfs_root *root, int num_items);
+int btrfs_unreserve_metadata_space(struct btrfs_root *root, int num_items);
+int btrfs_unreserve_metadata_for_delalloc(struct btrfs_root *root,
+                                          struct inode *inode, int num_items);
+int btrfs_reserve_metadata_for_delalloc(struct btrfs_root *root,
+                                        struct inode *inode, int num_items);
 int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode,
                                 u64 bytes);
 void btrfs_free_reserved_data_space(struct btrfs_root *root,
@@ -2006,7 +2040,6 @@ void btrfs_delalloc_reserve_space(struct btrfs_root *root, struct inode *inode,
                                  u64 bytes);
 void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode,
                               u64 bytes);
-void btrfs_free_pinned_extents(struct btrfs_fs_info *info);
 /* ctree.c */
 int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
                      int level, int *slot);
@@ -2100,12 +2133,15 @@ int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
                         struct extent_buffer *parent);
 /* root-item.c */
 int btrfs_find_root_ref(struct btrfs_root *tree_root,
-                   struct btrfs_path *path,
-                   u64 root_id, u64 ref_id);
+                        struct btrfs_path *path,
+                        u64 root_id, u64 ref_id);
 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
                        struct btrfs_root *tree_root,
-                       u64 root_id, u8 type, u64 ref_id,
-                       u64 dirid, u64 sequence,
+                       u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
+                       const char *name, int name_len);
+int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
+                       struct btrfs_root *tree_root,
+                       u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
                        const char *name, int name_len);
 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
                    struct btrfs_key *key);
@@ -2120,6 +2156,7 @@ int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
 int btrfs_search_root(struct btrfs_root *root, u64 search_start,
                       u64 *found_objectid);
 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid);
+int btrfs_find_orphan_roots(struct btrfs_root *tree_root);
 int btrfs_set_root_node(struct btrfs_root_item *item,
                         struct extent_buffer *node);
 /* dir-item.c */
@@ -2138,6 +2175,10 @@ btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
                             struct btrfs_path *path, u64 dir,
                             u64 objectid, const char *name, int name_len,
                             int mod);
+struct btrfs_dir_item *
+btrfs_search_dir_index_item(struct btrfs_root *root,
+                            struct btrfs_path *path, u64 dirid,
+                            const char *name, int name_len);
 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
                               struct btrfs_path *path,
                               const char *name, int name_len);
@@ -2160,6 +2201,7 @@ int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
                              struct btrfs_root *root, u64 offset);
 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
                           struct btrfs_root *root, u64 offset);
+int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
 
 /* inode-map.c */
 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
@@ -2232,6 +2274,10 @@ int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
 int btrfs_add_link(struct btrfs_trans_handle *trans,
                    struct inode *parent_inode, struct inode *inode,
                    const char *name, int name_len, int add_backref, u64 index);
+int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
+                        struct btrfs_root *root,
+                        struct inode *dir, u64 objectid,
+                        const char *name, int name_len);
 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
                                struct btrfs_root *root,
                                struct inode *inode, u64 new_size,
@@ -2242,7 +2288,7 @@ int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end);
 int btrfs_writepages(struct address_space *mapping,
                      struct writeback_control *wbc);
 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
-                             struct btrfs_root *new_root, struct dentry *dentry,
+                             struct btrfs_root *new_root,
                              u64 new_dirid, u64 alloc_hint);
 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
                          size_t size, struct bio *bio, unsigned long bio_flags);
@@ -2258,6 +2304,7 @@ int btrfs_write_inode(struct inode *inode, int wait);
 void btrfs_dirty_inode(struct inode *inode);
 struct inode *btrfs_alloc_inode(struct super_block *sb);
 void btrfs_destroy_inode(struct inode *inode);
+void btrfs_drop_inode(struct inode *inode);
 int btrfs_init_cachep(void);
 void btrfs_destroy_cachep(void);
 long btrfs_ioctl_trans_end(struct file *file);
@@ -2275,6 +2322,8 @@ int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
 int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode);
 void btrfs_orphan_cleanup(struct btrfs_root *root);
 int btrfs_cont_expand(struct inode *inode, loff_t size);
+int btrfs_invalidate_inodes(struct btrfs_root *root);
+extern struct dentry_operations btrfs_dentry_operations;
 
 /* ioctl.c */
 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
@@ -2286,11 +2335,11 @@ int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync);
 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
                             int skip_pinned);
 int btrfs_check_file(struct btrfs_root *root, struct inode *inode);
-extern struct file_operations btrfs_file_operations;
+extern const struct file_operations btrfs_file_operations;
 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
                        struct btrfs_root *root, struct inode *inode,
                        u64 start, u64 end, u64 locked_end,
-                       u64 inline_limit, u64 *hint_block);
+                       u64 inline_limit, u64 *hint_block, int drop_cache);
 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
                               struct btrfs_root *root,
                               struct inode *inode, u64 start, u64 end);
@@ -2317,7 +2366,7 @@ int btrfs_parse_options(struct btrfs_root *root, char *options);
 int btrfs_sync_fs(struct super_block *sb, int wait);
 
 /* acl.c */
-#ifdef CONFIG_FS_POSIX_ACL
+#ifdef CONFIG_BTRFS_POSIX_ACL
 int btrfs_check_acl(struct inode *inode, int mask);
 #else
 #define btrfs_check_acl NULL
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index 1d70236ba00c..f3a6075519cc 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -281,6 +281,53 @@ btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
         return btrfs_match_dir_item_name(root, path, name, name_len);
 }
 
+struct btrfs_dir_item *
+btrfs_search_dir_index_item(struct btrfs_root *root,
+                            struct btrfs_path *path, u64 dirid,
+                            const char *name, int name_len)
+{
+        struct extent_buffer *leaf;
+        struct btrfs_dir_item *di;
+        struct btrfs_key key;
+        u32 nritems;
+        int ret;
+
+        key.objectid = dirid;
+        key.type = BTRFS_DIR_INDEX_KEY;
+        key.offset = 0;
+
+        ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+        if (ret < 0)
+                return ERR_PTR(ret);
+
+        leaf = path->nodes[0];
+        nritems = btrfs_header_nritems(leaf);
+
+        while (1) {
+                if (path->slots[0] >= nritems) {
+                        ret = btrfs_next_leaf(root, path);
+                        if (ret < 0)
+                                return ERR_PTR(ret);
+                        if (ret > 0)
+                                break;
+                        leaf = path->nodes[0];
+                        nritems = btrfs_header_nritems(leaf);
+                        continue;
+                }
+
+                btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
+                if (key.objectid != dirid || key.type != BTRFS_DIR_INDEX_KEY)
+                        break;
+
+                di = btrfs_match_dir_item_name(root, path, name, name_len);
+                if (di)
+                        return di;
+
+                path->slots[0]++;
+        }
+        return NULL;
+}
+
 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
                                           struct btrfs_root *root,
                                           struct btrfs_path *path, u64 dir,
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 8b8192790011..af0435f79fa6 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -41,6 +41,7 @@
 
 static struct extent_io_ops btree_extent_io_ops;
 static void end_workqueue_fn(struct btrfs_work *work);
+static void free_fs_root(struct btrfs_root *root);
 
 static atomic_t btrfs_bdi_num = ATOMIC_INIT(0);
 
@@ -123,15 +124,15 @@ static struct extent_map *btree_get_extent(struct inode *inode,
         struct extent_map *em;
         int ret;
 
-        spin_lock(&em_tree->lock);
+        read_lock(&em_tree->lock);
         em = lookup_extent_mapping(em_tree, start, len);
         if (em) {
                 em->bdev =
                         BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
-                spin_unlock(&em_tree->lock);
+                read_unlock(&em_tree->lock);
                 goto out;
         }
-        spin_unlock(&em_tree->lock);
+        read_unlock(&em_tree->lock);
 
         em = alloc_extent_map(GFP_NOFS);
         if (!em) {
@@ -144,7 +145,7 @@ static struct extent_map *btree_get_extent(struct inode *inode,
         em->block_start = 0;
         em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
 
-        spin_lock(&em_tree->lock);
+        write_lock(&em_tree->lock);
         ret = add_extent_mapping(em_tree, em);
         if (ret == -EEXIST) {
                 u64 failed_start = em->start;
@@ -163,7 +164,7 @@ static struct extent_map *btree_get_extent(struct inode *inode,
                 free_extent_map(em);
                 em = NULL;
         }
-        spin_unlock(&em_tree->lock);
+        write_unlock(&em_tree->lock);
 
         if (ret)
                 em = ERR_PTR(ret);
@@ -772,7 +773,7 @@ static void btree_invalidatepage(struct page *page, unsigned long offset)
         }
 }
 
-static struct address_space_operations btree_aops = {
+static const struct address_space_operations btree_aops = {
         .readpage       = btree_readpage,
         .writepage      = btree_writepage,
         .writepages     = btree_writepages,
@@ -821,14 +822,14 @@ struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
 
 int btrfs_write_tree_block(struct extent_buffer *buf)
 {
-        return btrfs_fdatawrite_range(buf->first_page->mapping, buf->start,
-                                      buf->start + buf->len - 1, WB_SYNC_ALL);
+        return filemap_fdatawrite_range(buf->first_page->mapping, buf->start,
+                                        buf->start + buf->len - 1);
 }
 
 int btrfs_wait_tree_block_writeback(struct extent_buffer *buf)
 {
-        return btrfs_wait_on_page_writeback_range(buf->first_page->mapping,
-                                  buf->start, buf->start + buf->len - 1);
+        return filemap_fdatawait_range(buf->first_page->mapping,
+                                       buf->start, buf->start + buf->len - 1);
 }
 
 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
@@ -895,8 +896,7 @@ static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
         root->fs_info = fs_info;
         root->objectid = objectid;
         root->last_trans = 0;
-        root->highest_inode = 0;
-        root->last_inode_alloc = 0;
+        root->highest_objectid = 0;
         root->name = NULL;
         root->in_sysfs = 0;
         root->inode_tree.rb_node = NULL;
@@ -952,14 +952,16 @@ static int find_and_setup_root(struct btrfs_root *tree_root,
                      root, fs_info, objectid);
         ret = btrfs_find_last_root(tree_root, objectid,
                                    &root->root_item, &root->root_key);
+        if (ret > 0)
+                return -ENOENT;
         BUG_ON(ret);
 
         generation = btrfs_root_generation(&root->root_item);
         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
                                      blocksize, generation);
-        root->commit_root = btrfs_root_node(root);
         BUG_ON(!root->node);
+        root->commit_root = btrfs_root_node(root);
         return 0;
 }
 
@@ -1095,7 +1097,6 @@ struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
         struct btrfs_fs_info *fs_info = tree_root->fs_info;
         struct btrfs_path *path;
         struct extent_buffer *l;
-        u64 highest_inode;
         u64 generation;
         u32 blocksize;
         int ret = 0;
@@ -1110,7 +1111,7 @@ struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
                         kfree(root);
                         return ERR_PTR(ret);
                 }
-                goto insert;
+                goto out;
         }
 
         __setup_root(tree_root->nodesize, tree_root->leafsize,
@@ -1120,39 +1121,30 @@ struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
         path = btrfs_alloc_path();
         BUG_ON(!path);
         ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
-        if (ret != 0) {
-                if (ret > 0)
-                        ret = -ENOENT;
-                goto out;
+        if (ret == 0) {
+                l = path->nodes[0];
+                read_extent_buffer(l, &root->root_item,
+                                btrfs_item_ptr_offset(l, path->slots[0]),
+                                sizeof(root->root_item));
+                memcpy(&root->root_key, location, sizeof(*location));
         }
-        l = path->nodes[0];
-        read_extent_buffer(l, &root->root_item,
-               btrfs_item_ptr_offset(l, path->slots[0]),
-               sizeof(root->root_item));
-        memcpy(&root->root_key, location, sizeof(*location));
-        ret = 0;
-out:
-        btrfs_release_path(root, path);
         btrfs_free_path(path);
         if (ret) {
-                kfree(root);
+                if (ret > 0)
+                        ret = -ENOENT;
                 return ERR_PTR(ret);
         }
+
         generation = btrfs_root_generation(&root->root_item);
         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
                                      blocksize, generation);
         root->commit_root = btrfs_root_node(root);
         BUG_ON(!root->node);
-insert:
-        if (location->objectid != BTRFS_TREE_LOG_OBJECTID) {
+out:
+        if (location->objectid != BTRFS_TREE_LOG_OBJECTID)
                 root->ref_cows = 1;
-                ret = btrfs_find_highest_inode(root, &highest_inode);
-                if (ret == 0) {
-                        root->highest_inode = highest_inode;
-                        root->last_inode_alloc = highest_inode;
-                }
-        }
+
         return root;
 }
 
@@ -1187,39 +1179,66 @@ struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
                 return fs_info->dev_root;
         if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
                 return fs_info->csum_root;
-
+again:
+        spin_lock(&fs_info->fs_roots_radix_lock);
         root = radix_tree_lookup(&fs_info->fs_roots_radix,
                                  (unsigned long)location->objectid);
+        spin_unlock(&fs_info->fs_roots_radix_lock);
         if (root)
                 return root;
 
+        ret = btrfs_find_orphan_item(fs_info->tree_root, location->objectid);
+        if (ret == 0)
+                ret = -ENOENT;
+        if (ret < 0)
+                return ERR_PTR(ret);
+
         root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location);
         if (IS_ERR(root))
                 return root;
 
+        WARN_ON(btrfs_root_refs(&root->root_item) == 0);
         set_anon_super(&root->anon_super, NULL);
 
+        ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM);
+        if (ret)
+                goto fail;
+
+        spin_lock(&fs_info->fs_roots_radix_lock);
         ret = radix_tree_insert(&fs_info->fs_roots_radix,
                                 (unsigned long)root->root_key.objectid,
                                 root);
+        if (ret == 0)
+                root->in_radix = 1;
+        spin_unlock(&fs_info->fs_roots_radix_lock);
+        radix_tree_preload_end();
         if (ret) {
-                free_extent_buffer(root->node);
-                kfree(root);
-                return ERR_PTR(ret);
+                if (ret == -EEXIST) {
+                        free_fs_root(root);
+                        goto again;
+                }
+                goto fail;
         }
-        if (!(fs_info->sb->s_flags & MS_RDONLY)) {
-                ret = btrfs_find_dead_roots(fs_info->tree_root,
-                                            root->root_key.objectid);
-                BUG_ON(ret);
+
+        ret = btrfs_find_dead_roots(fs_info->tree_root,
+                                    root->root_key.objectid);
+        WARN_ON(ret);
+
+        if (!(fs_info->sb->s_flags & MS_RDONLY))
                 btrfs_orphan_cleanup(root);
-        }
+
         return root;
+fail:
+        free_fs_root(root);
+        return ERR_PTR(ret);
 }
 
 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
                                       struct btrfs_key *location,
                                       const char *name, int namelen)
 {
+        return btrfs_read_fs_root_no_name(fs_info, location);
+#if 0
         struct btrfs_root *root;
         int ret;
 
@@ -1236,7 +1255,7 @@ struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
                 kfree(root);
                 return ERR_PTR(ret);
         }
-#if 0
+
         ret = btrfs_sysfs_add_root(root);
         if (ret) {
                 free_extent_buffer(root->node);
@@ -1244,9 +1263,9 @@ struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
                 kfree(root);
                 return ERR_PTR(ret);
         }
-#endif
         root->in_sysfs = 1;
         return root;
+#endif
 }
 
 static int btrfs_congested_fn(void *congested_data, int bdi_bits)
@@ -1325,9 +1344,9 @@ static void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
         offset = page_offset(page);
 
         em_tree = &BTRFS_I(inode)->extent_tree;
-        spin_lock(&em_tree->lock);
+        read_lock(&em_tree->lock);
         em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
-        spin_unlock(&em_tree->lock);
+        read_unlock(&em_tree->lock);
         if (!em) {
                 __unplug_io_fn(bdi, page);
                 return;
@@ -1360,8 +1379,10 @@ static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
 
         err = bdi_register(bdi, NULL, "btrfs-%d",
                                 atomic_inc_return(&btrfs_bdi_num));
-        if (err)
+        if (err) {
+                bdi_destroy(bdi);
                 return err;
+        }
 
         bdi->ra_pages   = default_backing_dev_info.ra_pages;
         bdi->unplug_io_fn       = btrfs_unplug_io_fn;
@@ -1451,9 +1472,12 @@ static int cleaner_kthread(void *arg)
                         break;
 
                 vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE);
-                mutex_lock(&root->fs_info->cleaner_mutex);
-                btrfs_clean_old_snapshots(root);
-                mutex_unlock(&root->fs_info->cleaner_mutex);
+
+                if (!(root->fs_info->sb->s_flags & MS_RDONLY) &&
+                    mutex_trylock(&root->fs_info->cleaner_mutex)) {
+                        btrfs_clean_old_snapshots(root);
+                        mutex_unlock(&root->fs_info->cleaner_mutex);
+                }
 
                 if (freezing(current)) {
                         refrigerator();
@@ -1558,15 +1582,36 @@ struct btrfs_root *open_ctree(struct super_block *sb,
                 err = -ENOMEM;
                 goto fail;
         }
-        INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
+
+        ret = init_srcu_struct(&fs_info->subvol_srcu);
+        if (ret) {
+                err = ret;
+                goto fail;
+        }
+
+        ret = setup_bdi(fs_info, &fs_info->bdi);
+        if (ret) {
+                err = ret;
+                goto fail_srcu;
+        }
+
+        fs_info->btree_inode = new_inode(sb);
+        if (!fs_info->btree_inode) {
+                err = -ENOMEM;
+                goto fail_bdi;
+        }
+
+        INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
         INIT_LIST_HEAD(&fs_info->trans_list);
         INIT_LIST_HEAD(&fs_info->dead_roots);
         INIT_LIST_HEAD(&fs_info->hashers);
         INIT_LIST_HEAD(&fs_info->delalloc_inodes);
         INIT_LIST_HEAD(&fs_info->ordered_operations);
+        INIT_LIST_HEAD(&fs_info->caching_block_groups);
         spin_lock_init(&fs_info->delalloc_lock);
         spin_lock_init(&fs_info->new_trans_lock);
         spin_lock_init(&fs_info->ref_cache_lock);
+        spin_lock_init(&fs_info->fs_roots_radix_lock);
 
         init_completion(&fs_info->kobj_unregister);
         fs_info->tree_root = tree_root;
@@ -1585,12 +1630,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
         fs_info->sb = sb;
         fs_info->max_extent = (u64)-1;
         fs_info->max_inline = 8192 * 1024;
-        if (setup_bdi(fs_info, &fs_info->bdi))
-                goto fail_bdi;
-        fs_info->btree_inode = new_inode(sb);
-        fs_info->btree_inode->i_ino = 1;
-        fs_info->btree_inode->i_nlink = 1;
-        fs_info->metadata_ratio = 8;
+        fs_info->metadata_ratio = 0;
 
         fs_info->thread_pool_size = min_t(unsigned long,
                                           num_online_cpus() + 2, 8);
@@ -1602,6 +1642,8 @@ struct btrfs_root *open_ctree(struct super_block *sb,
         sb->s_blocksize_bits = blksize_bits(4096);
         sb->s_bdi = &fs_info->bdi;
 
+        fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID;
+        fs_info->btree_inode->i_nlink = 1;
         /*
          * we set the i_size on the btree inode to the max possible int.
          * the real end of the address space is determined by all of
@@ -1620,28 +1662,32 @@ struct btrfs_root *open_ctree(struct super_block *sb,
 
         BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops;
 
+        BTRFS_I(fs_info->btree_inode)->root = tree_root;
+        memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
+               sizeof(struct btrfs_key));
+        BTRFS_I(fs_info->btree_inode)->dummy_inode = 1;
+        insert_inode_hash(fs_info->btree_inode);
+
         spin_lock_init(&fs_info->block_group_cache_lock);
         fs_info->block_group_cache_tree.rb_node = NULL;
 
-        extent_io_tree_init(&fs_info->pinned_extents,
+        extent_io_tree_init(&fs_info->freed_extents[0],
                              fs_info->btree_inode->i_mapping, GFP_NOFS);
+        extent_io_tree_init(&fs_info->freed_extents[1],
+                             fs_info->btree_inode->i_mapping, GFP_NOFS);
+        fs_info->pinned_extents = &fs_info->freed_extents[0];
         fs_info->do_barriers = 1;
 
-        BTRFS_I(fs_info->btree_inode)->root = tree_root;
-        memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
-               sizeof(struct btrfs_key));
-        insert_inode_hash(fs_info->btree_inode);
 
         mutex_init(&fs_info->trans_mutex);
         mutex_init(&fs_info->ordered_operations_mutex);
         mutex_init(&fs_info->tree_log_mutex);
-        mutex_init(&fs_info->drop_mutex);
         mutex_init(&fs_info->chunk_mutex);
         mutex_init(&fs_info->transaction_kthread_mutex);
         mutex_init(&fs_info->cleaner_mutex);
         mutex_init(&fs_info->volume_mutex);
-        mutex_init(&fs_info->tree_reloc_mutex);
         init_rwsem(&fs_info->extent_commit_sem);
+        init_rwsem(&fs_info->subvol_sem);
 
         btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
         btrfs_init_free_cluster(&fs_info->data_alloc_cluster);
@@ -1700,7 +1746,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
                 err = -EINVAL;
                 goto fail_iput;
         }
-
+printk("thread pool is %d\n", fs_info->thread_pool_size);
         /*
          * we need to start all the end_io workers up front because the
          * queue work function gets called at interrupt time, and so it
@@ -1745,20 +1791,22 @@ struct btrfs_root *open_ctree(struct super_block *sb,
         fs_info->endio_workers.idle_thresh = 4;
         fs_info->endio_meta_workers.idle_thresh = 4;
 
-        fs_info->endio_write_workers.idle_thresh = 64;
-        fs_info->endio_meta_write_workers.idle_thresh = 64;
+        fs_info->endio_write_workers.idle_thresh = 2;
+        fs_info->endio_meta_write_workers.idle_thresh = 2;
+
+        fs_info->endio_workers.atomic_worker_start = 1;
+        fs_info->endio_meta_workers.atomic_worker_start = 1;
+        fs_info->endio_write_workers.atomic_worker_start = 1;
+        fs_info->endio_meta_write_workers.atomic_worker_start = 1;
 
         btrfs_start_workers(&fs_info->workers, 1);
         btrfs_start_workers(&fs_info->submit_workers, 1);
         btrfs_start_workers(&fs_info->delalloc_workers, 1);
         btrfs_start_workers(&fs_info->fixup_workers, 1);
-        btrfs_start_workers(&fs_info->endio_workers, fs_info->thread_pool_size);
-        btrfs_start_workers(&fs_info->endio_meta_workers,
-                            fs_info->thread_pool_size);
-        btrfs_start_workers(&fs_info->endio_meta_write_workers,
-                            fs_info->thread_pool_size);
-        btrfs_start_workers(&fs_info->endio_write_workers,
-                            fs_info->thread_pool_size);
+        btrfs_start_workers(&fs_info->endio_workers, 1);
+        btrfs_start_workers(&fs_info->endio_meta_workers, 1);
+        btrfs_start_workers(&fs_info->endio_meta_write_workers, 1);
+        btrfs_start_workers(&fs_info->endio_write_workers, 1);
 
         fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);
         fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages,
@@ -1918,6 +1966,9 @@ struct btrfs_root *open_ctree(struct super_block *sb,
                 }
         }
 
+        ret = btrfs_find_orphan_roots(tree_root);
+        BUG_ON(ret);
+
         if (!(sb->s_flags & MS_RDONLY)) {
                 ret = btrfs_recover_relocation(tree_root);
                 BUG_ON(ret);
@@ -1977,6 +2028,8 @@ fail_iput:
         btrfs_mapping_tree_free(&fs_info->mapping_tree);
 fail_bdi:
         bdi_destroy(&fs_info->bdi);
+fail_srcu:
+        cleanup_srcu_struct(&fs_info->subvol_srcu);
 fail:
         kfree(extent_root);
         kfree(tree_root);
@@ -2236,20 +2289,29 @@ int write_ctree_super(struct btrfs_trans_handle *trans,
 
 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
 {
-        WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
+        spin_lock(&fs_info->fs_roots_radix_lock);
         radix_tree_delete(&fs_info->fs_roots_radix,
                           (unsigned long)root->root_key.objectid);
+        spin_unlock(&fs_info->fs_roots_radix_lock);
+
+        if (btrfs_root_refs(&root->root_item) == 0)
+                synchronize_srcu(&fs_info->subvol_srcu);
+
+        free_fs_root(root);
+        return 0;
+}
+
+static void free_fs_root(struct btrfs_root *root)
+{
+        WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
         if (root->anon_super.s_dev) {
                 down_write(&root->anon_super.s_umount);
                 kill_anon_super(&root->anon_super);
         }
-        if (root->node)
-                free_extent_buffer(root->node);
-        if (root->commit_root)
-                free_extent_buffer(root->commit_root);
+        free_extent_buffer(root->node);
+        free_extent_buffer(root->commit_root);
         kfree(root->name);
         kfree(root);
-        return 0;
 }
 
 static int del_fs_roots(struct btrfs_fs_info *fs_info)
@@ -2258,6 +2320,20 @@ static int del_fs_roots(struct btrfs_fs_info *fs_info)
         struct btrfs_root *gang[8];
         int i;
 
+        while (!list_empty(&fs_info->dead_roots)) {
+                gang[0] = list_entry(fs_info->dead_roots.next,
+                                     struct btrfs_root, root_list);
+                list_del(&gang[0]->root_list);
+
+                if (gang[0]->in_radix) {
+                        btrfs_free_fs_root(fs_info, gang[0]);
+                } else {
+                        free_extent_buffer(gang[0]->node);
+                        free_extent_buffer(gang[0]->commit_root);
+                        kfree(gang[0]);
+                }
+        }
+
         while (1) {
                 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
                                              (void **)gang, 0,
@@ -2287,9 +2363,6 @@ int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
                 root_objectid = gang[ret - 1]->root_key.objectid + 1;
                 for (i = 0; i < ret; i++) {
                         root_objectid = gang[i]->root_key.objectid;
-                        ret = btrfs_find_dead_roots(fs_info->tree_root,
-                                                    root_objectid);
-                        BUG_ON(ret);
                         btrfs_orphan_cleanup(gang[i]);
                 }
                 root_objectid++;
@@ -2359,7 +2432,6 @@ int close_ctree(struct btrfs_root *root)
         free_extent_buffer(root->fs_info->csum_root->commit_root);
 
         btrfs_free_block_groups(root->fs_info);
-        btrfs_free_pinned_extents(root->fs_info);
 
         del_fs_roots(fs_info);
 
@@ -2378,6 +2450,7 @@ int close_ctree(struct btrfs_root *root)
         btrfs_mapping_tree_free(&fs_info->mapping_tree);
 
         bdi_destroy(&fs_info->bdi);
+        cleanup_srcu_struct(&fs_info->subvol_srcu);
 
         kfree(fs_info->extent_root);
         kfree(fs_info->tree_root);
diff --git a/fs/btrfs/export.c b/fs/btrfs/export.c
index 9596b40caa4e..ba5c3fd5ab8c 100644
--- a/fs/btrfs/export.c
+++ b/fs/btrfs/export.c
@@ -28,7 +28,7 @@ static int btrfs_encode_fh(struct dentry *dentry, u32 *fh, int *max_len,
         len  = BTRFS_FID_SIZE_NON_CONNECTABLE;
         type = FILEID_BTRFS_WITHOUT_PARENT;
 
-        fid->objectid = BTRFS_I(inode)->location.objectid;
+        fid->objectid = inode->i_ino;
         fid->root_objectid = BTRFS_I(inode)->root->objectid;
         fid->gen = inode->i_generation;
 
@@ -60,34 +60,61 @@ static int btrfs_encode_fh(struct dentry *dentry, u32 *fh, int *max_len,
 }
 
 static struct dentry *btrfs_get_dentry(struct super_block *sb, u64 objectid,
-                                       u64 root_objectid, u32 generation)
+                                       u64 root_objectid, u32 generation,
+                                       int check_generation)
 {
+        struct btrfs_fs_info *fs_info = btrfs_sb(sb)->fs_info;
         struct btrfs_root *root;
+        struct dentry *dentry;
         struct inode *inode;
         struct btrfs_key key;
+        int index;
+        int err = 0;
+
+        if (objectid < BTRFS_FIRST_FREE_OBJECTID)
+                return ERR_PTR(-ESTALE);
 
         key.objectid = root_objectid;
         btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
         key.offset = (u64)-1;
 
-        root = btrfs_read_fs_root_no_name(btrfs_sb(sb)->fs_info, &key);
-        if (IS_ERR(root))
-                return ERR_CAST(root);
+        index = srcu_read_lock(&fs_info->subvol_srcu);
+
+        root = btrfs_read_fs_root_no_name(fs_info, &key);
+        if (IS_ERR(root)) {
+                err = PTR_ERR(root);
+                goto fail;
+        }
+
+        if (btrfs_root_refs(&root->root_item) == 0) {
+                err = -ENOENT;
+                goto fail;
+        }
 
         key.objectid = objectid;
         btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
         key.offset = 0;
 
         inode = btrfs_iget(sb, &key, root);
-        if (IS_ERR(inode))
-                return (void *)inode;
+        if (IS_ERR(inode)) {
+                err = PTR_ERR(inode);
+                goto fail;
+        }
+
+        srcu_read_unlock(&fs_info->subvol_srcu, index);
 
-        if (generation != inode->i_generation) {
+        if (check_generation && generation != inode->i_generation) {
                 iput(inode);
                 return ERR_PTR(-ESTALE);
         }
 
-        return d_obtain_alias(inode);
+        dentry = d_obtain_alias(inode);
+        if (!IS_ERR(dentry))
+                dentry->d_op = &btrfs_dentry_operations;
+        return dentry;
+fail:
+        srcu_read_unlock(&fs_info->subvol_srcu, index);
+        return ERR_PTR(err);
 }
 
 static struct dentry *btrfs_fh_to_parent(struct super_block *sb, struct fid *fh,
@@ -111,7 +138,7 @@ static struct dentry *btrfs_fh_to_parent(struct super_block *sb, struct fid *fh,
         objectid = fid->parent_objectid;
         generation = fid->parent_gen;
 
-        return btrfs_get_dentry(sb, objectid, root_objectid, generation);
+        return btrfs_get_dentry(sb, objectid, root_objectid, generation, 1);
 }
 
 static struct dentry *btrfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
@@ -133,66 +160,76 @@ static struct dentry *btrfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
         root_objectid = fid->root_objectid;
         generation = fid->gen;
 
-        return btrfs_get_dentry(sb, objectid, root_objectid, generation);
+        return btrfs_get_dentry(sb, objectid, root_objectid, generation, 1);
 }
 
 static struct dentry *btrfs_get_parent(struct dentry *child)
 {
         struct inode *dir = child->d_inode;
+        static struct dentry *dentry;
         struct btrfs_root *root = BTRFS_I(dir)->root;
-        struct btrfs_key key;
         struct btrfs_path *path;
         struct extent_buffer *leaf;
-        int slot;
-        u64 objectid;
+        struct btrfs_root_ref *ref;
+        struct btrfs_key key;
+        struct btrfs_key found_key;
         int ret;
 
         path = btrfs_alloc_path();
 
-        key.objectid = dir->i_ino;
-        btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
-        key.offset = (u64)-1;
+        if (dir->i_ino == BTRFS_FIRST_FREE_OBJECTID) {
+                key.objectid = root->root_key.objectid;
+                key.type = BTRFS_ROOT_BACKREF_KEY;
+                key.offset = (u64)-1;
+                root = root->fs_info->tree_root;
+        } else {
+                key.objectid = dir->i_ino;
+                key.type = BTRFS_INODE_REF_KEY;
+                key.offset = (u64)-1;
+        }
 
         ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
-        if (ret < 0) {
-                /* Error */
-                btrfs_free_path(path);
-                return ERR_PTR(ret);
+        if (ret < 0)
+                goto fail;
+
+        BUG_ON(ret == 0);
+        if (path->slots[0] == 0) {
+                ret = -ENOENT;
+                goto fail;
         }
+
+        path->slots[0]--;
         leaf = path->nodes[0];
-        slot = path->slots[0];
-        if (ret) {
-                /* btrfs_search_slot() returns the slot where we'd want to
-                   insert a backref for parent inode #0xFFFFFFFFFFFFFFFF.
-                   The _real_ backref, telling us what the parent inode
-                   _actually_ is, will be in the slot _before_ the one
-                   that btrfs_search_slot() returns. */
-                if (!slot) {
-                        /* Unless there is _no_ key in the tree before... */
-                        btrfs_free_path(path);
-                        return ERR_PTR(-EIO);
-                }
-                slot--;
+
+        btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+        if (found_key.objectid != key.objectid || found_key.type != key.type) {
+                ret = -ENOENT;
+                goto fail;
         }
 
-        btrfs_item_key_to_cpu(leaf, &key, slot);
+        if (found_key.type == BTRFS_ROOT_BACKREF_KEY) {
+                ref = btrfs_item_ptr(leaf, path->slots[0],
+                                     struct btrfs_root_ref);
+                key.objectid = btrfs_root_ref_dirid(leaf, ref);
+        } else {
+                key.objectid = found_key.offset;
+        }
         btrfs_free_path(path);
 
-        if (key.objectid != dir->i_ino || key.type != BTRFS_INODE_REF_KEY)
-                return ERR_PTR(-EINVAL);
-
-        objectid = key.offset;
-
-        /* If we are already at the root of a subvol, return the real root */
-        if (objectid == dir->i_ino)
-                return dget(dir->i_sb->s_root);
+        if (found_key.type == BTRFS_ROOT_BACKREF_KEY) {
+                return btrfs_get_dentry(root->fs_info->sb, key.objectid,
+                                        found_key.offset, 0, 0);
+        }
 
-        /* Build a new key for the inode item */
-        key.objectid = objectid;
-        btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
+        key.type = BTRFS_INODE_ITEM_KEY;
         key.offset = 0;
-
-        return d_obtain_alias(btrfs_iget(root->fs_info->sb, &key, root));
+        dentry = d_obtain_alias(btrfs_iget(root->fs_info->sb, &key, root));
+        if (!IS_ERR(dentry))
+                dentry->d_op = &btrfs_dentry_operations;
+        return dentry;
+fail:
+        btrfs_free_path(path);
+        return ERR_PTR(ret);
 }
 
 const struct export_operations btrfs_export_ops = {
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 535f85ba104f..359a754c782c 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -32,12 +32,12 @@
 #include "locking.h"
 #include "free-space-cache.h"
 
-static int update_reserved_extents(struct btrfs_root *root,
-                                   u64 bytenr, u64 num, int reserve);
 static int update_block_group(struct btrfs_trans_handle *trans,
                               struct btrfs_root *root,
                               u64 bytenr, u64 num_bytes, int alloc,
                               int mark_free);
+static int update_reserved_extents(struct btrfs_block_group_cache *cache,
+                                   u64 num_bytes, int reserve);
 static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
                                 struct btrfs_root *root,
                                 u64 bytenr, u64 num_bytes, u64 parent,
@@ -57,10 +57,19 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
                                      u64 parent, u64 root_objectid,
                                      u64 flags, struct btrfs_disk_key *key,
                                      int level, struct btrfs_key *ins);
-
 static int do_chunk_alloc(struct btrfs_trans_handle *trans,
                           struct btrfs_root *extent_root, u64 alloc_bytes,
                           u64 flags, int force);
+static int pin_down_bytes(struct btrfs_trans_handle *trans,
+                          struct btrfs_root *root,
+                          struct btrfs_path *path,
+                          u64 bytenr, u64 num_bytes,
+                          int is_data, int reserved,
+                          struct extent_buffer **must_clean);
+static int find_next_key(struct btrfs_path *path, int level,
+                         struct btrfs_key *key);
+static void dump_space_info(struct btrfs_space_info *info, u64 bytes,
+                            int dump_block_groups);
 
 static noinline int
 block_group_cache_done(struct btrfs_block_group_cache *cache)
@@ -153,34 +162,34 @@ block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr,
         return ret;
 }
 
-/*
- * We always set EXTENT_LOCKED for the super mirror extents so we don't
- * overwrite them, so those bits need to be unset.  Also, if we are unmounting
- * with pinned extents still sitting there because we had a block group caching,
- * we need to clear those now, since we are done.
- */
-void btrfs_free_pinned_extents(struct btrfs_fs_info *info)
+static int add_excluded_extent(struct btrfs_root *root,
+                               u64 start, u64 num_bytes)
 {
-        u64 start, end, last = 0;
-        int ret;
+        u64 end = start + num_bytes - 1;
+        set_extent_bits(&root->fs_info->freed_extents[0],
+                        start, end, EXTENT_UPTODATE, GFP_NOFS);
+        set_extent_bits(&root->fs_info->freed_extents[1],
+                        start, end, EXTENT_UPTODATE, GFP_NOFS);
+        return 0;
+}
 
-        while (1) {
-                ret = find_first_extent_bit(&info->pinned_extents, last,
-                                            &start, &end,
-                                            EXTENT_LOCKED|EXTENT_DIRTY);
-                if (ret)
-                        break;
+static void free_excluded_extents(struct btrfs_root *root,
+                                  struct btrfs_block_group_cache *cache)
+{
+        u64 start, end;
 
-                clear_extent_bits(&info->pinned_extents, start, end,
-                                  EXTENT_LOCKED|EXTENT_DIRTY, GFP_NOFS);
-                last = end+1;
-        }
+        start = cache->key.objectid;
+        end = start + cache->key.offset - 1;
+
+        clear_extent_bits(&root->fs_info->freed_extents[0],
+                          start, end, EXTENT_UPTODATE, GFP_NOFS);
+        clear_extent_bits(&root->fs_info->freed_extents[1],
+                          start, end, EXTENT_UPTODATE, GFP_NOFS);
 }
 
-static int remove_sb_from_cache(struct btrfs_root *root,
-                                struct btrfs_block_group_cache *cache)
+static int exclude_super_stripes(struct btrfs_root *root,
+                                 struct btrfs_block_group_cache *cache)
 {
-        struct btrfs_fs_info *fs_info = root->fs_info;
         u64 bytenr;
         u64 *logical;
         int stripe_len;
@@ -192,17 +201,42 @@ static int remove_sb_from_cache(struct btrfs_root *root,
                                        cache->key.objectid, bytenr,
                                        0, &logical, &nr, &stripe_len);
                 BUG_ON(ret);
+
                 while (nr--) {
-                        try_lock_extent(&fs_info->pinned_extents,
-                                        logical[nr],
-                                        logical[nr] + stripe_len - 1, GFP_NOFS);
+                        cache->bytes_super += stripe_len;
+                        ret = add_excluded_extent(root, logical[nr],
+                                                  stripe_len);
+                        BUG_ON(ret);
                 }
+
                 kfree(logical);
         }
-
         return 0;
 }
 
+static struct btrfs_caching_control *
+get_caching_control(struct btrfs_block_group_cache *cache)
+{
+        struct btrfs_caching_control *ctl;
+
+        spin_lock(&cache->lock);
+        if (cache->cached != BTRFS_CACHE_STARTED) {
+                spin_unlock(&cache->lock);
+                return NULL;
+        }
+
+        ctl = cache->caching_ctl;
+        atomic_inc(&ctl->count);
+        spin_unlock(&cache->lock);
+        return ctl;
+}
+
+static void put_caching_control(struct btrfs_caching_control *ctl)
+{
+        if (atomic_dec_and_test(&ctl->count))
+                kfree(ctl);
+}
+
 /*
  * this is only called by cache_block_group, since we could have freed extents
  * we need to check the pinned_extents for any extents that can't be used yet
@@ -215,9 +249,9 @@ static u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
         int ret;
 
         while (start < end) {
-                ret = find_first_extent_bit(&info->pinned_extents, start,
+                ret = find_first_extent_bit(info->pinned_extents, start,
                                             &extent_start, &extent_end,
-                                            EXTENT_DIRTY|EXTENT_LOCKED);
+                                            EXTENT_DIRTY | EXTENT_UPTODATE);
                 if (ret)
                         break;
 
@@ -249,22 +283,27 @@ static int caching_kthread(void *data)
 {
         struct btrfs_block_group_cache *block_group = data;
         struct btrfs_fs_info *fs_info = block_group->fs_info;
-        u64 last = 0;
+        struct btrfs_caching_control *caching_ctl = block_group->caching_ctl;
+        struct btrfs_root *extent_root = fs_info->extent_root;
         struct btrfs_path *path;
-        int ret = 0;
-        struct btrfs_key key;
         struct extent_buffer *leaf;
-        int slot;
+        struct btrfs_key key;
         u64 total_found = 0;
-
-        BUG_ON(!fs_info);
+        u64 last = 0;
+        u32 nritems;
+        int ret = 0;
 
         path = btrfs_alloc_path();
         if (!path)
                 return -ENOMEM;
 
-        atomic_inc(&block_group->space_info->caching_threads);
+        exclude_super_stripes(extent_root, block_group);
+        spin_lock(&block_group->space_info->lock);
+        block_group->space_info->bytes_super += block_group->bytes_super;
+        spin_unlock(&block_group->space_info->lock);
+
         last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET);
+
         /*
          * We don't want to deadlock with somebody trying to allocate a new
          * extent for the extent root while also trying to search the extent
@@ -277,74 +316,64 @@ static int caching_kthread(void *data)
 
         key.objectid = last;
         key.offset = 0;
-        btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
+        key.type = BTRFS_EXTENT_ITEM_KEY;
 again:
+        mutex_lock(&caching_ctl->mutex);
         /* need to make sure the commit_root doesn't disappear */
         down_read(&fs_info->extent_commit_sem);
 
-        ret = btrfs_search_slot(NULL, fs_info->extent_root, &key, path, 0, 0);
+        ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
         if (ret < 0)
                 goto err;
 
+        leaf = path->nodes[0];
+        nritems = btrfs_header_nritems(leaf);
+
         while (1) {
                 smp_mb();
-                if (block_group->fs_info->closing > 1) {
+                if (fs_info->closing > 1) {
                         last = (u64)-1;
                         break;
                 }
 
-                leaf = path->nodes[0];
-                slot = path->slots[0];
-                if (slot >= btrfs_header_nritems(leaf)) {
-                        ret = btrfs_next_leaf(fs_info->extent_root, path);
-                        if (ret < 0)
-                                goto err;
-                        else if (ret)
+                if (path->slots[0] < nritems) {
+                        btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
+                } else {
+                        ret = find_next_key(path, 0, &key);
+                        if (ret)
                                 break;
 
-                        if (need_resched() ||
-                            btrfs_transaction_in_commit(fs_info)) {
-                                leaf = path->nodes[0];
-
-                                /* this shouldn't happen, but if the
-                                 * leaf is empty just move on.
-                                 */
-                                if (btrfs_header_nritems(leaf) == 0)
-                                        break;
-                                /*
-                                 * we need to copy the key out so that
-                                 * we are sure the next search advances
-                                 * us forward in the btree.
-                                 */
-                                btrfs_item_key_to_cpu(leaf, &key, 0);
-                                btrfs_release_path(fs_info->extent_root, path);
-                                up_read(&fs_info->extent_commit_sem);
+                        caching_ctl->progress = last;
+                        btrfs_release_path(extent_root, path);
+                        up_read(&fs_info->extent_commit_sem);
+                        mutex_unlock(&caching_ctl->mutex);
+                        if (btrfs_transaction_in_commit(fs_info))
                                 schedule_timeout(1);
-                                goto again;
-                        }
+                        else
+                                cond_resched();
+                        goto again;
+                }
 
+                if (key.objectid < block_group->key.objectid) {
+                        path->slots[0]++;
                         continue;
                 }
-                btrfs_item_key_to_cpu(leaf, &key, slot);
-                if (key.objectid < block_group->key.objectid)
-                        goto next;
 
                 if (key.objectid >= block_group->key.objectid +
                     block_group->key.offset)
                         break;
 
-                if (btrfs_key_type(&key) == BTRFS_EXTENT_ITEM_KEY) {
+                if (key.type == BTRFS_EXTENT_ITEM_KEY) {
                         total_found += add_new_free_space(block_group,
                                                           fs_info, last,
                                                           key.objectid);
                         last = key.objectid + key.offset;
-                }
 
-                if (total_found > (1024 * 1024 * 2)) {
-                        total_found = 0;
-                        wake_up(&block_group->caching_q);
+                        if (total_found > (1024 * 1024 * 2)) {
+                                total_found = 0;
+                                wake_up(&caching_ctl->wait);
+                        }
                 }
-next:
                 path->slots[0]++;
         }
         ret = 0;
@@ -352,33 +381,65 @@ next:
         total_found += add_new_free_space(block_group, fs_info, last,
                                           block_group->key.objectid +
                                           block_group->key.offset);
+        caching_ctl->progress = (u64)-1;
 
         spin_lock(&block_group->lock);
+        block_group->caching_ctl = NULL;
         block_group->cached = BTRFS_CACHE_FINISHED;
         spin_unlock(&block_group->lock);
 
 err:
         btrfs_free_path(path);
         up_read(&fs_info->extent_commit_sem);
-        atomic_dec(&block_group->space_info->caching_threads);
-        wake_up(&block_group->caching_q);
 
+        free_excluded_extents(extent_root, block_group);
+
+        mutex_unlock(&caching_ctl->mutex);
+        wake_up(&caching_ctl->wait);
+
+        put_caching_control(caching_ctl);
+        atomic_dec(&block_group->space_info->caching_threads);
         return 0;
 }
 
 static int cache_block_group(struct btrfs_block_group_cache *cache)
 {
+        struct btrfs_fs_info *fs_info = cache->fs_info;
+        struct btrfs_caching_control *caching_ctl;
         struct task_struct *tsk;
         int ret = 0;
 
+        smp_mb();
+        if (cache->cached != BTRFS_CACHE_NO)
+                return 0;
+
+        caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_KERNEL);
+        BUG_ON(!caching_ctl);
+
+        INIT_LIST_HEAD(&caching_ctl->list);
+        mutex_init(&caching_ctl->mutex);
+        init_waitqueue_head(&caching_ctl->wait);
+        caching_ctl->block_group = cache;
+        caching_ctl->progress = cache->key.objectid;
+        /* one for caching kthread, one for caching block group list */
+        atomic_set(&caching_ctl->count, 2);
+
         spin_lock(&cache->lock);
         if (cache->cached != BTRFS_CACHE_NO) {
                 spin_unlock(&cache->lock);
-                return ret;
+                kfree(caching_ctl);
+                return 0;
         }
+        cache->caching_ctl = caching_ctl;
         cache->cached = BTRFS_CACHE_STARTED;
         spin_unlock(&cache->lock);
 
+        down_write(&fs_info->extent_commit_sem);
+        list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups);
+        up_write(&fs_info->extent_commit_sem);
+
+        atomic_inc(&cache->space_info->caching_threads);
+
         tsk = kthread_run(caching_kthread, cache, "btrfs-cache-%llu\n",
                           cache->key.objectid);
         if (IS_ERR(tsk)) {
@@ -1657,7 +1718,6 @@ static int run_delayed_data_ref(struct btrfs_trans_handle *trans,
                                                  parent, ref_root, flags,
                                                  ref->objectid, ref->offset,
                                                  &ins, node->ref_mod);
-                update_reserved_extents(root, ins.objectid, ins.offset, 0);
         } else if (node->action == BTRFS_ADD_DELAYED_REF) {
                 ret = __btrfs_inc_extent_ref(trans, root, node->bytenr,
                                              node->num_bytes, parent,
@@ -1783,7 +1843,6 @@ static int run_delayed_tree_ref(struct btrfs_trans_handle *trans,
                                                 extent_op->flags_to_set,
                                                 &extent_op->key,
                                                 ref->level, &ins);
-                update_reserved_extents(root, ins.objectid, ins.offset, 0);
         } else if (node->action == BTRFS_ADD_DELAYED_REF) {
                 ret = __btrfs_inc_extent_ref(trans, root, node->bytenr,
                                              node->num_bytes, parent, ref_root,
@@ -1818,16 +1877,32 @@ static int run_one_delayed_ref(struct btrfs_trans_handle *trans,
                 BUG_ON(extent_op);
                 head = btrfs_delayed_node_to_head(node);
                 if (insert_reserved) {
+                        int mark_free = 0;
+                        struct extent_buffer *must_clean = NULL;
+
+                        ret = pin_down_bytes(trans, root, NULL,
+                                             node->bytenr, node->num_bytes,
+                                             head->is_data, 1, &must_clean);
+                        if (ret > 0)
+                                mark_free = 1;
+
+                        if (must_clean) {
+                                clean_tree_block(NULL, root, must_clean);
+                                btrfs_tree_unlock(must_clean);
+                                free_extent_buffer(must_clean);
+                        }
                         if (head->is_data) {
                                 ret = btrfs_del_csums(trans, root,
                                                       node->bytenr,
                                                       node->num_bytes);
                                 BUG_ON(ret);
                         }
-                        btrfs_update_pinned_extents(root, node->bytenr,
-                                                    node->num_bytes, 1);
-                        update_reserved_extents(root, node->bytenr,
-                                                node->num_bytes, 0);
+                        if (mark_free) {
+                                ret = btrfs_free_reserved_extent(root,
+                                                        node->bytenr,
+                                                        node->num_bytes);
+                                BUG_ON(ret);
+                        }
                 }
                 mutex_unlock(&head->mutex);
                 return 0;
@@ -2692,60 +2767,346 @@ void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *inode)
                                                        alloc_target);
 }
 
+static u64 calculate_bytes_needed(struct btrfs_root *root, int num_items)
+{
+        u64 num_bytes;
+        int level;
+
+        level = BTRFS_MAX_LEVEL - 2;
+        /*
+         * NOTE: these calculations are absolutely the worst possible case.
+         * This assumes that _every_ item we insert will require a new leaf, and
+         * that the tree has grown to its maximum level size.
+         */
+
+        /*
+         * for every item we insert we could insert both an extent item and a
+         * extent ref item.  Then for ever item we insert, we will need to cow
+         * both the original leaf, plus the leaf to the left and right of it.
+         *
+         * Unless we are talking about the extent root, then we just want the
+         * number of items * 2, since we just need the extent item plus its ref.
+         */
+        if (root == root->fs_info->extent_root)
+                num_bytes = num_items * 2;
+        else
+                num_bytes = (num_items + (2 * num_items)) * 3;
+
+        /*
+         * num_bytes is total number of leaves we could need times the leaf
+         * size, and then for every leaf we could end up cow'ing 2 nodes per
+         * level, down to the leaf level.
+         */
+        num_bytes = (num_bytes * root->leafsize) +
+                (num_bytes * (level * 2)) * root->nodesize;
+
+        return num_bytes;
+}
+
 /*
- * for now this just makes sure we have at least 5% of our metadata space free
- * for use.
+ * Unreserve metadata space for delalloc.  If we have less reserved credits than
+ * we have extents, this function does nothing.
  */
-int btrfs_check_metadata_free_space(struct btrfs_root *root)
+int btrfs_unreserve_metadata_for_delalloc(struct btrfs_root *root,
+                                          struct inode *inode, int num_items)
 {
         struct btrfs_fs_info *info = root->fs_info;
         struct btrfs_space_info *meta_sinfo;
-        u64 alloc_target, thresh;
-        int committed = 0, ret;
+        u64 num_bytes;
+        u64 alloc_target;
+        bool bug = false;
 
         /* get the space info for where the metadata will live */
         alloc_target = btrfs_get_alloc_profile(root, 0);
         meta_sinfo = __find_space_info(info, alloc_target);
 
-again:
+        num_bytes = calculate_bytes_needed(root->fs_info->extent_root,
+                                           num_items);
+
         spin_lock(&meta_sinfo->lock);
-        if (!meta_sinfo->full)
-                thresh = meta_sinfo->total_bytes * 80;
-        else
-                thresh = meta_sinfo->total_bytes * 95;
+        if (BTRFS_I(inode)->delalloc_reserved_extents <=
+            BTRFS_I(inode)->delalloc_extents) {
+                spin_unlock(&meta_sinfo->lock);
+                return 0;
+        }
+
+        BTRFS_I(inode)->delalloc_reserved_extents--;
+        BUG_ON(BTRFS_I(inode)->delalloc_reserved_extents < 0);
+
+        if (meta_sinfo->bytes_delalloc < num_bytes) {
+                bug = true;
+                meta_sinfo->bytes_delalloc = 0;
+        } else {
+                meta_sinfo->bytes_delalloc -= num_bytes;
+        }
+        spin_unlock(&meta_sinfo->lock);
+
+        BUG_ON(bug);
+
+        return 0;
+}
 
+static void check_force_delalloc(struct btrfs_space_info *meta_sinfo)
+{
+        u64 thresh;
+
+        thresh = meta_sinfo->bytes_used + meta_sinfo->bytes_reserved +
+                meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly +
+                meta_sinfo->bytes_super + meta_sinfo->bytes_root +
+                meta_sinfo->bytes_may_use;
+
+        thresh = meta_sinfo->total_bytes - thresh;
+        thresh *= 80;
         do_div(thresh, 100);
+        if (thresh <= meta_sinfo->bytes_delalloc)
+                meta_sinfo->force_delalloc = 1;
+        else
+                meta_sinfo->force_delalloc = 0;
+}
 
-        if (meta_sinfo->bytes_used + meta_sinfo->bytes_reserved +
-            meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly > thresh) {
-                struct btrfs_trans_handle *trans;
-                if (!meta_sinfo->full) {
-                        meta_sinfo->force_alloc = 1;
-                        spin_unlock(&meta_sinfo->lock);
+static int maybe_allocate_chunk(struct btrfs_root *root,
+                                 struct btrfs_space_info *info)
+{
+        struct btrfs_super_block *disk_super = &root->fs_info->super_copy;
+        struct btrfs_trans_handle *trans;
+        bool wait = false;
+        int ret = 0;
+        u64 min_metadata;
+        u64 free_space;
 
-                        trans = btrfs_start_transaction(root, 1);
-                        if (!trans)
-                                return -ENOMEM;
+        free_space = btrfs_super_total_bytes(disk_super);
+        /*
+         * we allow the metadata to grow to a max of either 5gb or 5% of the
+         * space in the volume.
+         */
+        min_metadata = min((u64)5 * 1024 * 1024 * 1024,
+                             div64_u64(free_space * 5, 100));
+        if (info->total_bytes >= min_metadata) {
+                spin_unlock(&info->lock);
+                return 0;
+        }
 
-                        ret = do_chunk_alloc(trans, root->fs_info->extent_root,
-                                             2 * 1024 * 1024, alloc_target, 0);
-                        btrfs_end_transaction(trans, root);
+        if (info->full) {
+                spin_unlock(&info->lock);
+                return 0;
+        }
+
+        if (!info->allocating_chunk) {
+                info->force_alloc = 1;
+                info->allocating_chunk = 1;
+                init_waitqueue_head(&info->wait);
+        } else {
+                wait = true;
+        }
+
+        spin_unlock(&info->lock);
+
+        if (wait) {
+                wait_event(info->wait,
+                           !info->allocating_chunk);
+                return 1;
+        }
+
+        trans = btrfs_start_transaction(root, 1);
+        if (!trans) {
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        ret = do_chunk_alloc(trans, root->fs_info->extent_root,
+                             4096 + 2 * 1024 * 1024,
+                             info->flags, 0);
+        btrfs_end_transaction(trans, root);
+        if (ret)
+                goto out;
+out:
+        spin_lock(&info->lock);
+        info->allocating_chunk = 0;
+        spin_unlock(&info->lock);
+        wake_up(&info->wait);
+
+        if (ret)
+                return 0;
+        return 1;
+}
+
+/*
+ * Reserve metadata space for delalloc.
+ */
+int btrfs_reserve_metadata_for_delalloc(struct btrfs_root *root,
+                                        struct inode *inode, int num_items)
+{
+        struct btrfs_fs_info *info = root->fs_info;
+        struct btrfs_space_info *meta_sinfo;
+        u64 num_bytes;
+        u64 used;
+        u64 alloc_target;
+        int flushed = 0;
+        int force_delalloc;
+
+        /* get the space info for where the metadata will live */
+        alloc_target = btrfs_get_alloc_profile(root, 0);
+        meta_sinfo = __find_space_info(info, alloc_target);
+
+        num_bytes = calculate_bytes_needed(root->fs_info->extent_root,
+                                           num_items);
+again:
+        spin_lock(&meta_sinfo->lock);
+
+        force_delalloc = meta_sinfo->force_delalloc;
+
+        if (unlikely(!meta_sinfo->bytes_root))
+                meta_sinfo->bytes_root = calculate_bytes_needed(root, 6);
+
+        if (!flushed)
+                meta_sinfo->bytes_delalloc += num_bytes;
+
+        used = meta_sinfo->bytes_used + meta_sinfo->bytes_reserved +
+                meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly +
+                meta_sinfo->bytes_super + meta_sinfo->bytes_root +
+                meta_sinfo->bytes_may_use + meta_sinfo->bytes_delalloc;
+
+        if (used > meta_sinfo->total_bytes) {
+                flushed++;
+
+                if (flushed == 1) {
+                        if (maybe_allocate_chunk(root, meta_sinfo))
+                                goto again;
+                        flushed++;
+                } else {
+                        spin_unlock(&meta_sinfo->lock);
+                }
+
+                if (flushed == 2) {
+                        filemap_flush(inode->i_mapping);
+                        goto again;
+                } else if (flushed == 3) {
+                        btrfs_start_delalloc_inodes(root);
+                        btrfs_wait_ordered_extents(root, 0);
                         goto again;
                 }
+                spin_lock(&meta_sinfo->lock);
+                meta_sinfo->bytes_delalloc -= num_bytes;
                 spin_unlock(&meta_sinfo->lock);
+                printk(KERN_ERR "enospc, has %d, reserved %d\n",
+                       BTRFS_I(inode)->delalloc_extents,
+                       BTRFS_I(inode)->delalloc_reserved_extents);
+                dump_space_info(meta_sinfo, 0, 0);
+                return -ENOSPC;
+        }
 
-                if (!committed) {
-                        committed = 1;
-                        trans = btrfs_join_transaction(root, 1);
-                        if (!trans)
-                                return -ENOMEM;
-                        ret = btrfs_commit_transaction(trans, root);
-                        if (ret)
-                                return ret;
+        BTRFS_I(inode)->delalloc_reserved_extents++;
+        check_force_delalloc(meta_sinfo);
+        spin_unlock(&meta_sinfo->lock);
+
+        if (!flushed && force_delalloc)
+                filemap_flush(inode->i_mapping);
+
+        return 0;
+}
+
+/*
+ * unreserve num_items number of items worth of metadata space.  This needs to
+ * be paired with btrfs_reserve_metadata_space.
+ *
+ * NOTE: if you have the option, run this _AFTER_ you do a
+ * btrfs_end_transaction, since btrfs_end_transaction will run delayed ref
+ * oprations which will result in more used metadata, so we want to make sure we
+ * can do that without issue.
+ */
+int btrfs_unreserve_metadata_space(struct btrfs_root *root, int num_items)
+{
+        struct btrfs_fs_info *info = root->fs_info;
+        struct btrfs_space_info *meta_sinfo;
+        u64 num_bytes;
+        u64 alloc_target;
+        bool bug = false;
+
+        /* get the space info for where the metadata will live */
+        alloc_target = btrfs_get_alloc_profile(root, 0);
+        meta_sinfo = __find_space_info(info, alloc_target);
+
+        num_bytes = calculate_bytes_needed(root, num_items);
+
+        spin_lock(&meta_sinfo->lock);
+        if (meta_sinfo->bytes_may_use < num_bytes) {
+                bug = true;
+                meta_sinfo->bytes_may_use = 0;
+        } else {
+                meta_sinfo->bytes_may_use -= num_bytes;
+        }
+        spin_unlock(&meta_sinfo->lock);
+
+        BUG_ON(bug);
+
+        return 0;
+}
+
+/*
+ * Reserve some metadata space for use.  We'll calculate the worste case number
+ * of bytes that would be needed to modify num_items number of items.  If we
+ * have space, fantastic, if not, you get -ENOSPC.  Please call
+ * btrfs_unreserve_metadata_space when you are done for the _SAME_ number of
+ * items you reserved, since whatever metadata you needed should have already
+ * been allocated.
+ *
+ * This will commit the transaction to make more space if we don't have enough
+ * metadata space.  THe only time we don't do this is if we're reserving space
+ * inside of a transaction, then we will just return -ENOSPC and it is the
+ * callers responsibility to handle it properly.
+ */
+int btrfs_reserve_metadata_space(struct btrfs_root *root, int num_items)
+{
+        struct btrfs_fs_info *info = root->fs_info;
+        struct btrfs_space_info *meta_sinfo;
+        u64 num_bytes;
+        u64 used;
+        u64 alloc_target;
+        int retries = 0;
+
+        /* get the space info for where the metadata will live */
+        alloc_target = btrfs_get_alloc_profile(root, 0);
+        meta_sinfo = __find_space_info(info, alloc_target);
+
+        num_bytes = calculate_bytes_needed(root, num_items);
+again:
+        spin_lock(&meta_sinfo->lock);
+
+        if (unlikely(!meta_sinfo->bytes_root))
+                meta_sinfo->bytes_root = calculate_bytes_needed(root, 6);
+
+        if (!retries)
+                meta_sinfo->bytes_may_use += num_bytes;
+
+        used = meta_sinfo->bytes_used + meta_sinfo->bytes_reserved +
+                meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly +
+                meta_sinfo->bytes_super + meta_sinfo->bytes_root +
+                meta_sinfo->bytes_may_use + meta_sinfo->bytes_delalloc;
+
+        if (used > meta_sinfo->total_bytes) {
+                retries++;
+                if (retries == 1) {
+                        if (maybe_allocate_chunk(root, meta_sinfo))
+                                goto again;
+                        retries++;
+                } else {
+                        spin_unlock(&meta_sinfo->lock);
+                }
+
+                if (retries == 2) {
+                        btrfs_start_delalloc_inodes(root);
+                        btrfs_wait_ordered_extents(root, 0);
                         goto again;
                 }
+                spin_lock(&meta_sinfo->lock);
+                meta_sinfo->bytes_may_use -= num_bytes;
+                spin_unlock(&meta_sinfo->lock);
+
+                dump_space_info(meta_sinfo, 0, 0);
                 return -ENOSPC;
         }
+
+        check_force_delalloc(meta_sinfo);
         spin_unlock(&meta_sinfo->lock);
 
         return 0;
@@ -2765,13 +3126,16 @@ int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode,
         bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
 
         data_sinfo = BTRFS_I(inode)->space_info;
+        if (!data_sinfo)
+                goto alloc;
+
 again:
         /* make sure we have enough space to handle the data first */
         spin_lock(&data_sinfo->lock);
         if (data_sinfo->total_bytes - data_sinfo->bytes_used -
             data_sinfo->bytes_delalloc - data_sinfo->bytes_reserved -
             data_sinfo->bytes_pinned - data_sinfo->bytes_readonly -
-            data_sinfo->bytes_may_use < bytes) {
+            data_sinfo->bytes_may_use - data_sinfo->bytes_super < bytes) {
                 struct btrfs_trans_handle *trans;
 
                 /*
@@ -2783,7 +3147,7 @@ again:
 
                         data_sinfo->force_alloc = 1;
                         spin_unlock(&data_sinfo->lock);
-
+alloc:
                         alloc_target = btrfs_get_alloc_profile(root, 1);
                         trans = btrfs_start_transaction(root, 1);
                         if (!trans)
@@ -2795,12 +3159,17 @@ again:
                         btrfs_end_transaction(trans, root);
                         if (ret)
                                 return ret;
+
+                        if (!data_sinfo) {
+                                btrfs_set_inode_space_info(root, inode);
+                                data_sinfo = BTRFS_I(inode)->space_info;
+                        }
                         goto again;
                 }
                 spin_unlock(&data_sinfo->lock);
 
                 /* commit the current transaction and try again */
-                if (!committed) {
+                if (!committed && !root->fs_info->open_ioctl_trans) {
                         committed = 1;
                         trans = btrfs_join_transaction(root, 1);
                         if (!trans)
@@ -2828,7 +3197,7 @@ again:
         BTRFS_I(inode)->reserved_bytes += bytes;
         spin_unlock(&data_sinfo->lock);
 
-        return btrfs_check_metadata_free_space(root);
+        return 0;
 }
 
 /*
@@ -2927,17 +3296,15 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
         BUG_ON(!space_info);
 
         spin_lock(&space_info->lock);
-        if (space_info->force_alloc) {
+        if (space_info->force_alloc)
                 force = 1;
-                space_info->force_alloc = 0;
-        }
         if (space_info->full) {
                 spin_unlock(&space_info->lock);
                 goto out;
         }
 
         thresh = space_info->total_bytes - space_info->bytes_readonly;
-        thresh = div_factor(thresh, 6);
+        thresh = div_factor(thresh, 8);
         if (!force &&
            (space_info->bytes_used + space_info->bytes_pinned +
             space_info->bytes_reserved + alloc_bytes) < thresh) {
@@ -2951,7 +3318,7 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
          * we keep a reasonable number of metadata chunks allocated in the
          * FS as well.
          */
-        if (flags & BTRFS_BLOCK_GROUP_DATA) {
+        if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) {
                 fs_info->data_chunk_allocations++;
                 if (!(fs_info->data_chunk_allocations %
                       fs_info->metadata_ratio))
@@ -2959,8 +3326,11 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
         }
 
         ret = btrfs_alloc_chunk(trans, extent_root, flags);
+        spin_lock(&space_info->lock);
         if (ret)
                 space_info->full = 1;
+        space_info->force_alloc = 0;
+        spin_unlock(&space_info->lock);
 out:
         mutex_unlock(&extent_root->fs_info->chunk_mutex);
         return ret;
@@ -3009,10 +3379,12 @@ static int update_block_group(struct btrfs_trans_handle *trans,
                 num_bytes = min(total, cache->key.offset - byte_in_group);
                 if (alloc) {
                         old_val += num_bytes;
+                        btrfs_set_block_group_used(&cache->item, old_val);
+                        cache->reserved -= num_bytes;
                         cache->space_info->bytes_used += num_bytes;
+                        cache->space_info->bytes_reserved -= num_bytes;
                         if (cache->ro)
                                 cache->space_info->bytes_readonly -= num_bytes;
-                        btrfs_set_block_group_used(&cache->item, old_val);
                         spin_unlock(&cache->lock);
                         spin_unlock(&cache->space_info->lock);
                 } else {
@@ -3057,127 +3429,136 @@ static u64 first_logical_byte(struct btrfs_root *root, u64 search_start)
         return bytenr;
 }
 
-int btrfs_update_pinned_extents(struct btrfs_root *root,
-                                u64 bytenr, u64 num, int pin)
+/*
+ * this function must be called within transaction
+ */
+int btrfs_pin_extent(struct btrfs_root *root,
+                     u64 bytenr, u64 num_bytes, int reserved)
 {
-        u64 len;
-        struct btrfs_block_group_cache *cache;
         struct btrfs_fs_info *fs_info = root->fs_info;
+        struct btrfs_block_group_cache *cache;
 
-        if (pin)
-                set_extent_dirty(&fs_info->pinned_extents,
-                                bytenr, bytenr + num - 1, GFP_NOFS);
-
-        while (num > 0) {
-                cache = btrfs_lookup_block_group(fs_info, bytenr);
-                BUG_ON(!cache);
-                len = min(num, cache->key.offset -
-                          (bytenr - cache->key.objectid));
-                if (pin) {
-                        spin_lock(&cache->space_info->lock);
-                        spin_lock(&cache->lock);
-                        cache->pinned += len;
-                        cache->space_info->bytes_pinned += len;
-                        spin_unlock(&cache->lock);
-                        spin_unlock(&cache->space_info->lock);
-                        fs_info->total_pinned += len;
-                } else {
-                        int unpin = 0;
+        cache = btrfs_lookup_block_group(fs_info, bytenr);
+        BUG_ON(!cache);
 
-                        /*
-                         * in order to not race with the block group caching, we
-                         * only want to unpin the extent if we are cached.  If
-                         * we aren't cached, we want to start async caching this
-                         * block group so we can free the extent the next time
-                         * around.
-                         */
-                        spin_lock(&cache->space_info->lock);
-                        spin_lock(&cache->lock);
-                        unpin = (cache->cached == BTRFS_CACHE_FINISHED);
-                        if (likely(unpin)) {
-                                cache->pinned -= len;
-                                cache->space_info->bytes_pinned -= len;
-                                fs_info->total_pinned -= len;
-                        }
-                        spin_unlock(&cache->lock);
-                        spin_unlock(&cache->space_info->lock);
+        spin_lock(&cache->space_info->lock);
+        spin_lock(&cache->lock);
+        cache->pinned += num_bytes;
+        cache->space_info->bytes_pinned += num_bytes;
+        if (reserved) {
+                cache->reserved -= num_bytes;
+                cache->space_info->bytes_reserved -= num_bytes;
+        }
+        spin_unlock(&cache->lock);
+        spin_unlock(&cache->space_info->lock);
 
-                        if (likely(unpin))
-                                clear_extent_dirty(&fs_info->pinned_extents,
-                                                   bytenr, bytenr + len -1,
-                                                   GFP_NOFS);
-                        else
-                                cache_block_group(cache);
+        btrfs_put_block_group(cache);
 
-                        if (unpin)
-                                btrfs_add_free_space(cache, bytenr, len);
-                }
-                btrfs_put_block_group(cache);
-                bytenr += len;
-                num -= len;
+        set_extent_dirty(fs_info->pinned_extents,
+                         bytenr, bytenr + num_bytes - 1, GFP_NOFS);
+        return 0;
+}
+
+static int update_reserved_extents(struct btrfs_block_group_cache *cache,
+                                   u64 num_bytes, int reserve)
+{
+        spin_lock(&cache->space_info->lock);
+        spin_lock(&cache->lock);
+        if (reserve) {
+                cache->reserved += num_bytes;
+                cache->space_info->bytes_reserved += num_bytes;
+        } else {
+                cache->reserved -= num_bytes;
+                cache->space_info->bytes_reserved -= num_bytes;
         }
+        spin_unlock(&cache->lock);
+        spin_unlock(&cache->space_info->lock);
         return 0;
 }
 
-static int update_reserved_extents(struct btrfs_root *root,
-                                   u64 bytenr, u64 num, int reserve)
+int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
+                                struct btrfs_root *root)
 {
-        u64 len;
-        struct btrfs_block_group_cache *cache;
         struct btrfs_fs_info *fs_info = root->fs_info;
+        struct btrfs_caching_control *next;
+        struct btrfs_caching_control *caching_ctl;
+        struct btrfs_block_group_cache *cache;
 
-        while (num > 0) {
-                cache = btrfs_lookup_block_group(fs_info, bytenr);
-                BUG_ON(!cache);
-                len = min(num, cache->key.offset -
-                          (bytenr - cache->key.objectid));
+        down_write(&fs_info->extent_commit_sem);
 
-                spin_lock(&cache->space_info->lock);
-                spin_lock(&cache->lock);
-                if (reserve) {
-                        cache->reserved += len;
-                        cache->space_info->bytes_reserved += len;
+        list_for_each_entry_safe(caching_ctl, next,
+                                 &fs_info->caching_block_groups, list) {
+                cache = caching_ctl->block_group;
+                if (block_group_cache_done(cache)) {
+                        cache->last_byte_to_unpin = (u64)-1;
+                        list_del_init(&caching_ctl->list);
+                        put_caching_control(caching_ctl);
                 } else {
-                        cache->reserved -= len;
-                        cache->space_info->bytes_reserved -= len;
+                        cache->last_byte_to_unpin = caching_ctl->progress;
                 }
-                spin_unlock(&cache->lock);
-                spin_unlock(&cache->space_info->lock);
-                btrfs_put_block_group(cache);
-                bytenr += len;
-                num -= len;
         }
+
+        if (fs_info->pinned_extents == &fs_info->freed_extents[0])
+                fs_info->pinned_extents = &fs_info->freed_extents[1];
+        else
+                fs_info->pinned_extents = &fs_info->freed_extents[0];
+
+        up_write(&fs_info->extent_commit_sem);
         return 0;
 }
 
-int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy)
+static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end)
 {
-        u64 last = 0;
-        u64 start;
-        u64 end;
-        struct extent_io_tree *pinned_extents = &root->fs_info->pinned_extents;
-        int ret;
+        struct btrfs_fs_info *fs_info = root->fs_info;
+        struct btrfs_block_group_cache *cache = NULL;
+        u64 len;
 
-        while (1) {
-                ret = find_first_extent_bit(pinned_extents, last,
-                                            &start, &end, EXTENT_DIRTY);
-                if (ret)
-                        break;
+        while (start <= end) {
+                if (!cache ||
+                    start >= cache->key.objectid + cache->key.offset) {
+                        if (cache)
+                                btrfs_put_block_group(cache);
+                        cache = btrfs_lookup_block_group(fs_info, start);
+                        BUG_ON(!cache);
+                }
+
+                len = cache->key.objectid + cache->key.offset - start;
+                len = min(len, end + 1 - start);
+
+                if (start < cache->last_byte_to_unpin) {
+                        len = min(len, cache->last_byte_to_unpin - start);
+                        btrfs_add_free_space(cache, start, len);
+                }
 
-                set_extent_dirty(copy, start, end, GFP_NOFS);
-                last = end + 1;
+                spin_lock(&cache->space_info->lock);
+                spin_lock(&cache->lock);
+                cache->pinned -= len;
+                cache->space_info->bytes_pinned -= len;
+                spin_unlock(&cache->lock);
+                spin_unlock(&cache->space_info->lock);
+
+                start += len;
         }
+
+        if (cache)
+                btrfs_put_block_group(cache);
         return 0;
 }
 
 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
-                               struct btrfs_root *root,
-                               struct extent_io_tree *unpin)
+                               struct btrfs_root *root)
 {
+        struct btrfs_fs_info *fs_info = root->fs_info;
+        struct extent_io_tree *unpin;
         u64 start;
         u64 end;
         int ret;
 
+        if (fs_info->pinned_extents == &fs_info->freed_extents[0])
+                unpin = &fs_info->freed_extents[1];
+        else
+                unpin = &fs_info->freed_extents[0];
+
         while (1) {
                 ret = find_first_extent_bit(unpin, 0, &start, &end,
                                             EXTENT_DIRTY);
@@ -3186,10 +3567,8 @@ int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
 
                 ret = btrfs_discard_extent(root, start, end + 1 - start);
 
-                /* unlocks the pinned mutex */
-                btrfs_update_pinned_extents(root, start, end + 1 - start, 0);
                 clear_extent_dirty(unpin, start, end, GFP_NOFS);
-
+                unpin_extent_range(root, start, end);
                 cond_resched();
         }
 
@@ -3199,7 +3578,8 @@ int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
 static int pin_down_bytes(struct btrfs_trans_handle *trans,
                           struct btrfs_root *root,
                           struct btrfs_path *path,
-                          u64 bytenr, u64 num_bytes, int is_data,
+                          u64 bytenr, u64 num_bytes,
+                          int is_data, int reserved,
                           struct extent_buffer **must_clean)
 {
         int err = 0;
@@ -3231,15 +3611,15 @@ static int pin_down_bytes(struct btrfs_trans_handle *trans,
         }
         free_extent_buffer(buf);
 pinit:
-        btrfs_set_path_blocking(path);
+        if (path)
+                btrfs_set_path_blocking(path);
         /* unlocks the pinned mutex */
-        btrfs_update_pinned_extents(root, bytenr, num_bytes, 1);
+        btrfs_pin_extent(root, bytenr, num_bytes, reserved);
 
         BUG_ON(err < 0);
         return 0;
 }
 
-
 static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
                                 struct btrfs_root *root,
                                 u64 bytenr, u64 num_bytes, u64 parent,
@@ -3413,7 +3793,7 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
                 }
 
                 ret = pin_down_bytes(trans, root, path, bytenr,
-                                     num_bytes, is_data, &must_clean);
+                                     num_bytes, is_data, 0, &must_clean);
                 if (ret > 0)
                         mark_free = 1;
                 BUG_ON(ret < 0);
@@ -3544,8 +3924,7 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans,
         if (root_objectid == BTRFS_TREE_LOG_OBJECTID) {
                 WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID);
                 /* unlocks the pinned mutex */
-                btrfs_update_pinned_extents(root, bytenr, num_bytes, 1);
-                update_reserved_extents(root, bytenr, num_bytes, 0);
+                btrfs_pin_extent(root, bytenr, num_bytes, 1);
                 ret = 0;
         } else if (owner < BTRFS_FIRST_FREE_OBJECTID) {
                 ret = btrfs_add_delayed_tree_ref(trans, bytenr, num_bytes,
@@ -3585,19 +3964,33 @@ static noinline int
 wait_block_group_cache_progress(struct btrfs_block_group_cache *cache,
                                 u64 num_bytes)
 {
+        struct btrfs_caching_control *caching_ctl;
         DEFINE_WAIT(wait);
 
-        prepare_to_wait(&cache->caching_q, &wait, TASK_UNINTERRUPTIBLE);
-
-        if (block_group_cache_done(cache)) {
-                finish_wait(&cache->caching_q, &wait);
+        caching_ctl = get_caching_control(cache);
+        if (!caching_ctl)
                 return 0;
-        }
-        schedule();
-        finish_wait(&cache->caching_q, &wait);
 
-        wait_event(cache->caching_q, block_group_cache_done(cache) ||
+        wait_event(caching_ctl->wait, block_group_cache_done(cache) ||
                    (cache->free_space >= num_bytes));
+
+        put_caching_control(caching_ctl);
+        return 0;
+}
+
+static noinline int
+wait_block_group_cache_done(struct btrfs_block_group_cache *cache)
+{
+        struct btrfs_caching_control *caching_ctl;
+        DEFINE_WAIT(wait);
+
+        caching_ctl = get_caching_control(cache);
+        if (!caching_ctl)
+                return 0;
+
+        wait_event(caching_ctl->wait, block_group_cache_done(cache));
+
+        put_caching_control(caching_ctl);
         return 0;
 }
 
@@ -3635,6 +4028,7 @@ static noinline int find_free_extent(struct btrfs_trans_handle *trans,
         int last_ptr_loop = 0;
         int loop = 0;
         bool found_uncached_bg = false;
+        bool failed_cluster_refill = false;
 
         WARN_ON(num_bytes < root->sectorsize);
         btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY);
@@ -3732,7 +4126,16 @@ have_block_group:
                 if (unlikely(block_group->ro))
                         goto loop;
 
-                if (last_ptr) {
+                /*
+                 * Ok we want to try and use the cluster allocator, so lets look
+                 * there, unless we are on LOOP_NO_EMPTY_SIZE, since we will
+                 * have tried the cluster allocator plenty of times at this
+                 * point and not have found anything, so we are likely way too
+                 * fragmented for the clustering stuff to find anything, so lets
+                 * just skip it and let the allocator find whatever block it can
+                 * find
+                 */
+                if (last_ptr && loop < LOOP_NO_EMPTY_SIZE) {
                         /*
                          * the refill lock keeps out other
                          * people trying to start a new cluster
@@ -3807,9 +4210,11 @@ refill_cluster:
                                         spin_unlock(&last_ptr->refill_lock);
                                         goto checks;
                                 }
-                        } else if (!cached && loop > LOOP_CACHING_NOWAIT) {
+                        } else if (!cached && loop > LOOP_CACHING_NOWAIT
+                                   && !failed_cluster_refill) {
                                 spin_unlock(&last_ptr->refill_lock);
 
+                                failed_cluster_refill = true;
                                 wait_block_group_cache_progress(block_group,
                                        num_bytes + empty_cluster + empty_size);
                                 goto have_block_group;
@@ -3821,13 +4226,9 @@ refill_cluster:
                          * cluster.  Free the cluster we've been trying
                          * to use, and go to the next block group
                          */
-                        if (loop < LOOP_NO_EMPTY_SIZE) {
-                                btrfs_return_cluster_to_free_space(NULL,
-                                                                   last_ptr);
-                                spin_unlock(&last_ptr->refill_lock);
-                                goto loop;
-                        }
+                        btrfs_return_cluster_to_free_space(NULL, last_ptr);
                         spin_unlock(&last_ptr->refill_lock);
+                        goto loop;
                 }
 
                 offset = btrfs_find_space_for_alloc(block_group, search_start,
@@ -3881,9 +4282,12 @@ checks:
                                              search_start - offset);
                 BUG_ON(offset > search_start);
 
+                update_reserved_extents(block_group, num_bytes, 1);
+
                 /* we are all good, lets return */
                 break;
 loop:
+                failed_cluster_refill = false;
                 btrfs_put_block_group(block_group);
         }
         up_read(&space_info->groups_sem);
@@ -3941,21 +4345,32 @@ loop:
         return ret;
 }
 
-static void dump_space_info(struct btrfs_space_info *info, u64 bytes)
+static void dump_space_info(struct btrfs_space_info *info, u64 bytes,
+                            int dump_block_groups)
 {
         struct btrfs_block_group_cache *cache;
 
+        spin_lock(&info->lock);
         printk(KERN_INFO "space_info has %llu free, is %sfull\n",
                (unsigned long long)(info->total_bytes - info->bytes_used -
-                                    info->bytes_pinned - info->bytes_reserved),
+                                    info->bytes_pinned - info->bytes_reserved -
+                                    info->bytes_super),
                (info->full) ? "" : "not ");
         printk(KERN_INFO "space_info total=%llu, pinned=%llu, delalloc=%llu,"
-               " may_use=%llu, used=%llu\n",
+               " may_use=%llu, used=%llu, root=%llu, super=%llu, reserved=%llu"
+               "\n",
                (unsigned long long)info->total_bytes,
                (unsigned long long)info->bytes_pinned,
                (unsigned long long)info->bytes_delalloc,
                (unsigned long long)info->bytes_may_use,
-               (unsigned long long)info->bytes_used);
+               (unsigned long long)info->bytes_used,
+               (unsigned long long)info->bytes_root,
+               (unsigned long long)info->bytes_super,
+               (unsigned long long)info->bytes_reserved);
+        spin_unlock(&info->lock);
+
+        if (!dump_block_groups)
+                return;
 
         down_read(&info->groups_sem);
         list_for_each_entry(cache, &info->block_groups, list) {
@@ -3973,12 +4388,12 @@ static void dump_space_info(struct btrfs_space_info *info, u64 bytes)
         up_read(&info->groups_sem);
 }
 
-static int __btrfs_reserve_extent(struct btrfs_trans_handle *trans,
-                                  struct btrfs_root *root,
-                                  u64 num_bytes, u64 min_alloc_size,
-                                  u64 empty_size, u64 hint_byte,
-                                  u64 search_end, struct btrfs_key *ins,
-                                  u64 data)
+int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
+                         struct btrfs_root *root,
+                         u64 num_bytes, u64 min_alloc_size,
+                         u64 empty_size, u64 hint_byte,
+                         u64 search_end, struct btrfs_key *ins,
+                         u64 data)
 {
         int ret;
         u64 search_start = 0;
@@ -4023,7 +4438,7 @@ again:
                 printk(KERN_ERR "btrfs allocation failed flags %llu, "
                        "wanted %llu\n", (unsigned long long)data,
                        (unsigned long long)num_bytes);
-                dump_space_info(sinfo, num_bytes);
+                dump_space_info(sinfo, num_bytes, 1);
         }
 
         return ret;
@@ -4044,25 +4459,8 @@ int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len)
         ret = btrfs_discard_extent(root, start, len);
 
         btrfs_add_free_space(cache, start, len);
+        update_reserved_extents(cache, len, 0);
         btrfs_put_block_group(cache);
-        update_reserved_extents(root, start, len, 0);
-
-        return ret;
-}
-
-int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
-                                  struct btrfs_root *root,
-                                  u64 num_bytes, u64 min_alloc_size,
-                                  u64 empty_size, u64 hint_byte,
-                                  u64 search_end, struct btrfs_key *ins,
-                                  u64 data)
-{
-        int ret;
-        ret = __btrfs_reserve_extent(trans, root, num_bytes, min_alloc_size,
-                                     empty_size, hint_byte, search_end, ins,
-                                     data);
-        if (!ret)
-                update_reserved_extents(root, ins->objectid, ins->offset, 1);
 
         return ret;
 }
@@ -4223,15 +4621,46 @@ int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
 {
         int ret;
         struct btrfs_block_group_cache *block_group;
+        struct btrfs_caching_control *caching_ctl;
+        u64 start = ins->objectid;
+        u64 num_bytes = ins->offset;
 
         block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid);
         cache_block_group(block_group);
-        wait_event(block_group->caching_q,
-                   block_group_cache_done(block_group));
+        caching_ctl = get_caching_control(block_group);
 
-        ret = btrfs_remove_free_space(block_group, ins->objectid,
-                                      ins->offset);
-        BUG_ON(ret);
+        if (!caching_ctl) {
+                BUG_ON(!block_group_cache_done(block_group));
+                ret = btrfs_remove_free_space(block_group, start, num_bytes);
+                BUG_ON(ret);
+        } else {
+                mutex_lock(&caching_ctl->mutex);
+
+                if (start >= caching_ctl->progress) {
+                        ret = add_excluded_extent(root, start, num_bytes);
+                        BUG_ON(ret);
+                } else if (start + num_bytes <= caching_ctl->progress) {
+                        ret = btrfs_remove_free_space(block_group,
+                                                      start, num_bytes);
+                        BUG_ON(ret);
+                } else {
+                        num_bytes = caching_ctl->progress - start;
+                        ret = btrfs_remove_free_space(block_group,
+                                                      start, num_bytes);
+                        BUG_ON(ret);
+
+                        start = caching_ctl->progress;
+                        num_bytes = ins->objectid + ins->offset -
+                                    caching_ctl->progress;
+                        ret = add_excluded_extent(root, start, num_bytes);
+                        BUG_ON(ret);
+                }
+
+                mutex_unlock(&caching_ctl->mutex);
+                put_caching_control(caching_ctl);
+        }
+
+        update_reserved_extents(block_group, ins->offset, 1);
         btrfs_put_block_group(block_group);
         ret = alloc_reserved_file_extent(trans, root, 0, root_objectid,
                                          0, owner, offset, ins, 1);
@@ -4255,9 +4684,9 @@ static int alloc_tree_block(struct btrfs_trans_handle *trans,
         int ret;
         u64 flags = 0;
 
-        ret = __btrfs_reserve_extent(trans, root, num_bytes, num_bytes,
-                                     empty_size, hint_byte, search_end,
-                                     ins, 0);
+        ret = btrfs_reserve_extent(trans, root, num_bytes, num_bytes,
+                                   empty_size, hint_byte, search_end,
+                                   ins, 0);
         if (ret)
                 return ret;
 
@@ -4268,7 +4697,6 @@ static int alloc_tree_block(struct btrfs_trans_handle *trans,
         } else
                 BUG_ON(parent > 0);
 
-        update_reserved_extents(root, ins->objectid, ins->offset, 1);
         if (root_objectid != BTRFS_TREE_LOG_OBJECTID) {
                 struct btrfs_delayed_extent_op *extent_op;
                 extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS);
@@ -4347,452 +4775,99 @@ struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
         return buf;
 }
 
-#if 0
-int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans,
-                        struct btrfs_root *root, struct extent_buffer *leaf)
-{
-        u64 disk_bytenr;
-        u64 num_bytes;
-        struct btrfs_key key;
-        struct btrfs_file_extent_item *fi;
-        u32 nritems;
-        int i;
-        int ret;
-
-        BUG_ON(!btrfs_is_leaf(leaf));
-        nritems = btrfs_header_nritems(leaf);
-
-        for (i = 0; i < nritems; i++) {
-                cond_resched();
-                btrfs_item_key_to_cpu(leaf, &key, i);
-
-                /* only extents have references, skip everything else */
-                if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
-                        continue;
-
-                fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item);
-
-                /* inline extents live in the btree, they don't have refs */
-                if (btrfs_file_extent_type(leaf, fi) ==
-                    BTRFS_FILE_EXTENT_INLINE)
-                        continue;
-
-                disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
-
-                /* holes don't have refs */
-                if (disk_bytenr == 0)
-                        continue;
-
-                num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
-                ret = btrfs_free_extent(trans, root, disk_bytenr, num_bytes,
-                                        leaf->start, 0, key.objectid, 0);
-                BUG_ON(ret);
-        }
-        return 0;
-}
-
-static noinline int cache_drop_leaf_ref(struct btrfs_trans_handle *trans,
-                                        struct btrfs_root *root,
-                                        struct btrfs_leaf_ref *ref)
-{
-        int i;
-        int ret;
-        struct btrfs_extent_info *info;
-        struct refsort *sorted;
-
-        if (ref->nritems == 0)
-                return 0;
-
-        sorted = kmalloc(sizeof(*sorted) * ref->nritems, GFP_NOFS);
-        for (i = 0; i < ref->nritems; i++) {
-                sorted[i].bytenr = ref->extents[i].bytenr;
-                sorted[i].slot = i;
-        }
-        sort(sorted, ref->nritems, sizeof(struct refsort), refsort_cmp, NULL);
-
-        /*
-         * the items in the ref were sorted when the ref was inserted
-         * into the ref cache, so this is already in order
-         */
-        for (i = 0; i < ref->nritems; i++) {
-                info = ref->extents + sorted[i].slot;
-                ret = btrfs_free_extent(trans, root, info->bytenr,
-                                          info->num_bytes, ref->bytenr,
-                                          ref->owner, ref->generation,
-                                          info->objectid, 0);
-
-                atomic_inc(&root->fs_info->throttle_gen);
-                wake_up(&root->fs_info->transaction_throttle);
-                cond_resched();
-
-                BUG_ON(ret);
-                info++;
-        }
-
-        kfree(sorted);
-        return 0;
-}
-
-
-static int drop_snap_lookup_refcount(struct btrfs_trans_handle *trans,
-                                     struct btrfs_root *root, u64 start,
-                                     u64 len, u32 *refs)
-{
-        int ret;
-
-        ret = btrfs_lookup_extent_refs(trans, root, start, len, refs);
-        BUG_ON(ret);
-
-#if 0 /* some debugging code in case we see problems here */
-        /* if the refs count is one, it won't get increased again.  But
-         * if the ref count is > 1, someone may be decreasing it at
-         * the same time we are.
-         */
-        if (*refs != 1) {
-                struct extent_buffer *eb = NULL;
-                eb = btrfs_find_create_tree_block(root, start, len);
-                if (eb)
-                        btrfs_tree_lock(eb);
-
-                mutex_lock(&root->fs_info->alloc_mutex);
-                ret = lookup_extent_ref(NULL, root, start, len, refs);
-                BUG_ON(ret);
-                mutex_unlock(&root->fs_info->alloc_mutex);
-
-                if (eb) {
-                        btrfs_tree_unlock(eb);
-                        free_extent_buffer(eb);
-                }
-                if (*refs == 1) {
-                        printk(KERN_ERR "btrfs block %llu went down to one "
-                               "during drop_snap\n", (unsigned long long)start);
-                }
-
-        }
-#endif
-
-        cond_resched();
-        return ret;
-}
+struct walk_control {
+        u64 refs[BTRFS_MAX_LEVEL];
+        u64 flags[BTRFS_MAX_LEVEL];
+        struct btrfs_key update_progress;
+        int stage;
+        int level;
+        int shared_level;
+        int update_ref;
+        int keep_locks;
+        int reada_slot;
+        int reada_count;
+};
 
+#define DROP_REFERENCE  1
+#define UPDATE_BACKREF  2
 
-/*
- * this is used while deleting old snapshots, and it drops the refs
- * on a whole subtree starting from a level 1 node.
- *
- * The idea is to sort all the leaf pointers, and then drop the
- * ref on all the leaves in order.  Most of the time the leaves
- * will have ref cache entries, so no leaf IOs will be required to
- * find the extents they have references on.
- *
- * For each leaf, any references it has are also dropped in order
- *
- * This ends up dropping the references in something close to optimal
- * order for reading and modifying the extent allocation tree.
- */
-static noinline int drop_level_one_refs(struct btrfs_trans_handle *trans,
-                                        struct btrfs_root *root,
-                                        struct btrfs_path *path)
+static noinline void reada_walk_down(struct btrfs_trans_handle *trans,
+                                     struct btrfs_root *root,
+                                     struct walk_control *wc,
+                                     struct btrfs_path *path)
 {
         u64 bytenr;
-        u64 root_owner;
-        u64 root_gen;
-        struct extent_buffer *eb = path->nodes[1];
-        struct extent_buffer *leaf;
-        struct btrfs_leaf_ref *ref;
-        struct refsort *sorted = NULL;
-        int nritems = btrfs_header_nritems(eb);
+        u64 generation;
+        u64 refs;
+        u64 last = 0;
+        u32 nritems;
+        u32 blocksize;
+        struct btrfs_key key;
+        struct extent_buffer *eb;
         int ret;
-        int i;
-        int refi = 0;
-        int slot = path->slots[1];
-        u32 blocksize = btrfs_level_size(root, 0);
-        u32 refs;
-
-        if (nritems == 0)
-                goto out;
-
-        root_owner = btrfs_header_owner(eb);
-        root_gen = btrfs_header_generation(eb);
-        sorted = kmalloc(sizeof(*sorted) * nritems, GFP_NOFS);
+        int slot;
+        int nread = 0;
 
-        /*
-         * step one, sort all the leaf pointers so we don't scribble
-         * randomly into the extent allocation tree
-         */
-        for (i = slot; i < nritems; i++) {
-                sorted[refi].bytenr = btrfs_node_blockptr(eb, i);
-                sorted[refi].slot = i;
-                refi++;
+        if (path->slots[wc->level] < wc->reada_slot) {
+                wc->reada_count = wc->reada_count * 2 / 3;
+                wc->reada_count = max(wc->reada_count, 2);
+        } else {
+                wc->reada_count = wc->reada_count * 3 / 2;
+                wc->reada_count = min_t(int, wc->reada_count,
+                                        BTRFS_NODEPTRS_PER_BLOCK(root));
         }
 
-        /*
-         * nritems won't be zero, but if we're picking up drop_snapshot
-         * after a crash, slot might be > 0, so double check things
-         * just in case.
-         */
-        if (refi == 0)
-                goto out;
+        eb = path->nodes[wc->level];
+        nritems = btrfs_header_nritems(eb);
+        blocksize = btrfs_level_size(root, wc->level - 1);
 
-        sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL);
+        for (slot = path->slots[wc->level]; slot < nritems; slot++) {
+                if (nread >= wc->reada_count)
+                        break;
 
-        /*
-         * the first loop frees everything the leaves point to
-         */
-        for (i = 0; i < refi; i++) {
-                u64 ptr_gen;
+                cond_resched();
+                bytenr = btrfs_node_blockptr(eb, slot);
+                generation = btrfs_node_ptr_generation(eb, slot);
 
-                bytenr = sorted[i].bytenr;
+                if (slot == path->slots[wc->level])
+                        goto reada;
 
-                /*
-                 * check the reference count on this leaf.  If it is > 1
-                 * we just decrement it below and don't update any
-                 * of the refs the leaf points to.
-                 */
-                ret = drop_snap_lookup_refcount(trans, root, bytenr,
-                                                blocksize, &refs);
-                BUG_ON(ret);
-                if (refs != 1)
+                if (wc->stage == UPDATE_BACKREF &&
+                    generation <= root->root_key.offset)
                         continue;
 
-                ptr_gen = btrfs_node_ptr_generation(eb, sorted[i].slot);
-
-                /*
-                 * the leaf only had one reference, which means the
-                 * only thing pointing to this leaf is the snapshot
-                 * we're deleting.  It isn't possible for the reference
-                 * count to increase again later
-                 *
-                 * The reference cache is checked for the leaf,
-                 * and if found we'll be able to drop any refs held by
-                 * the leaf without needing to read it in.
-                 */
-                ref = btrfs_lookup_leaf_ref(root, bytenr);
-                if (ref && ref->generation != ptr_gen) {
-                        btrfs_free_leaf_ref(root, ref);
-                        ref = NULL;
-                }
-                if (ref) {
-                        ret = cache_drop_leaf_ref(trans, root, ref);
-                        BUG_ON(ret);
-                        btrfs_remove_leaf_ref(root, ref);
-                        btrfs_free_leaf_ref(root, ref);
-                } else {
-                        /*
-                         * the leaf wasn't in the reference cache, so
-                         * we have to read it.
-                         */
-                        leaf = read_tree_block(root, bytenr, blocksize,
-                                               ptr_gen);
-                        ret = btrfs_drop_leaf_ref(trans, root, leaf);
+                if (wc->stage == DROP_REFERENCE) {
+                        ret = btrfs_lookup_extent_info(trans, root,
+                                                bytenr, blocksize,
+                                                &refs, NULL);
                         BUG_ON(ret);
-                        free_extent_buffer(leaf);
-                }
-                atomic_inc(&root->fs_info->throttle_gen);
-                wake_up(&root->fs_info->transaction_throttle);
-                cond_resched();
-        }
-
-        /*
-         * run through the loop again to free the refs on the leaves.
-         * This is faster than doing it in the loop above because
-         * the leaves are likely to be clustered together.  We end up
-         * working in nice chunks on the extent allocation tree.
-         */
-        for (i = 0; i < refi; i++) {
-                bytenr = sorted[i].bytenr;
-                ret = btrfs_free_extent(trans, root, bytenr,
-                                        blocksize, eb->start,
-                                        root_owner, root_gen, 0, 1);
-                BUG_ON(ret);
-
-                atomic_inc(&root->fs_info->throttle_gen);
-                wake_up(&root->fs_info->transaction_throttle);
-                cond_resched();
-        }
-out:
-        kfree(sorted);
-
-        /*
-         * update the path to show we've processed the entire level 1
-         * node.  This will get saved into the root's drop_snapshot_progress
-         * field so these drops are not repeated again if this transaction
-         * commits.
-         */
-        path->slots[1] = nritems;
-        return 0;
-}
-
-/*
- * helper function for drop_snapshot, this walks down the tree dropping ref
- * counts as it goes.
- */
-static noinline int walk_down_tree(struct btrfs_trans_handle *trans,
-                                   struct btrfs_root *root,
-                                   struct btrfs_path *path, int *level)
-{
-        u64 root_owner;
-        u64 root_gen;
-        u64 bytenr;
-        u64 ptr_gen;
-        struct extent_buffer *next;
-        struct extent_buffer *cur;
-        struct extent_buffer *parent;
-        u32 blocksize;
-        int ret;
-        u32 refs;
-
-        WARN_ON(*level < 0);
-        WARN_ON(*level >= BTRFS_MAX_LEVEL);
-        ret = drop_snap_lookup_refcount(trans, root, path->nodes[*level]->start,
-                                path->nodes[*level]->len, &refs);
-        BUG_ON(ret);
-        if (refs > 1)
-                goto out;
-
-        /*
-         * walk down to the last node level and free all the leaves
-         */
-        while (*level >= 0) {
-                WARN_ON(*level < 0);
-                WARN_ON(*level >= BTRFS_MAX_LEVEL);
-                cur = path->nodes[*level];
+                        BUG_ON(refs == 0);
+                        if (refs == 1)
+                                goto reada;
 
-                if (btrfs_header_level(cur) != *level)
-                        WARN_ON(1);
-
-                if (path->slots[*level] >=
-                    btrfs_header_nritems(cur))
-                        break;
-
-                /* the new code goes down to level 1 and does all the
-                 * leaves pointed to that node in bulk.  So, this check
-                 * for level 0 will always be false.
-                 *
-                 * But, the disk format allows the drop_snapshot_progress
-                 * field in the root to leave things in a state where
-                 * a leaf will need cleaning up here.  If someone crashes
-                 * with the old code and then boots with the new code,
-                 * we might find a leaf here.
-                 */
-                if (*level == 0) {
-                        ret = btrfs_drop_leaf_ref(trans, root, cur);
-                        BUG_ON(ret);
-                        break;
+                        if (!wc->update_ref ||
+                            generation <= root->root_key.offset)
+                                continue;
+                        btrfs_node_key_to_cpu(eb, &key, slot);
+                        ret = btrfs_comp_cpu_keys(&key,
+                                                  &wc->update_progress);
+                        if (ret < 0)
+                                continue;
                 }
-
-                /*
-                 * once we get to level one, process the whole node
-                 * at once, including everything below it.
-                 */
-                if (*level == 1) {
-                        ret = drop_level_one_refs(trans, root, path);
-                        BUG_ON(ret);
+reada:
+                ret = readahead_tree_block(root, bytenr, blocksize,
+                                           generation);
+                if (ret)
                         break;
-                }
-
-                bytenr = btrfs_node_blockptr(cur, path->slots[*level]);
-                ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]);
-                blocksize = btrfs_level_size(root, *level - 1);
-
-                ret = drop_snap_lookup_refcount(trans, root, bytenr,
-                                                blocksize, &refs);
-                BUG_ON(ret);
-
-                /*
-                 * if there is more than one reference, we don't need
-                 * to read that node to drop any references it has.  We
-                 * just drop the ref we hold on that node and move on to the
-                 * next slot in this level.
-                 */
-                if (refs != 1) {
-                        parent = path->nodes[*level];
-                        root_owner = btrfs_header_owner(parent);
-                        root_gen = btrfs_header_generation(parent);
-                        path->slots[*level]++;
-
-                        ret = btrfs_free_extent(trans, root, bytenr,
-                                                blocksize, parent->start,
-                                                root_owner, root_gen,
-                                                *level - 1, 1);
-                        BUG_ON(ret);
-
-                        atomic_inc(&root->fs_info->throttle_gen);
-                        wake_up(&root->fs_info->transaction_throttle);
-                        cond_resched();
-
-                        continue;
-                }
-
-                /*
-                 * we need to keep freeing things in the next level down.
-                 * read the block and loop around to process it
-                 */
-                next = read_tree_block(root, bytenr, blocksize, ptr_gen);
-                WARN_ON(*level <= 0);
-                if (path->nodes[*level-1])
-                        free_extent_buffer(path->nodes[*level-1]);
-                path->nodes[*level-1] = next;
-                *level = btrfs_header_level(next);
-                path->slots[*level] = 0;
-                cond_resched();
+                last = bytenr + blocksize;
+                nread++;
         }
-out:
-        WARN_ON(*level < 0);
-        WARN_ON(*level >= BTRFS_MAX_LEVEL);
-
-        if (path->nodes[*level] == root->node) {
-                parent = path->nodes[*level];
-                bytenr = path->nodes[*level]->start;
-        } else {
-                parent = path->nodes[*level + 1];
-                bytenr = btrfs_node_blockptr(parent, path->slots[*level + 1]);
-        }
-
-        blocksize = btrfs_level_size(root, *level);
-        root_owner = btrfs_header_owner(parent);
-        root_gen = btrfs_header_generation(parent);
-
-        /*
-         * cleanup and free the reference on the last node
-         * we processed
-         */
-        ret = btrfs_free_extent(trans, root, bytenr, blocksize,
-                                  parent->start, root_owner, root_gen,
-                                  *level, 1);
-        free_extent_buffer(path->nodes[*level]);
-        path->nodes[*level] = NULL;
-
-        *level += 1;
-        BUG_ON(ret);
-
-        cond_resched();
-        return 0;
+        wc->reada_slot = slot;
 }
-#endif
-
-struct walk_control {
-        u64 refs[BTRFS_MAX_LEVEL];
-        u64 flags[BTRFS_MAX_LEVEL];
-        struct btrfs_key update_progress;
-        int stage;
-        int level;
-        int shared_level;
-        int update_ref;
-        int keep_locks;
-};
-
-#define DROP_REFERENCE  1
-#define UPDATE_BACKREF  2
 
 /*
  * hepler to process tree block while walking down the tree.
  *
- * when wc->stage == DROP_REFERENCE, this function checks
- * reference count of the block. if the block is shared and
- * we need update back refs for the subtree rooted at the
- * block, this function changes wc->stage to UPDATE_BACKREF
- *
  * when wc->stage == UPDATE_BACKREF, this function updates
  * back refs for pointers in the block.
  *
@@ -4805,7 +4880,6 @@ static noinline int walk_down_proc(struct btrfs_trans_handle *trans,
 {
         int level = wc->level;
         struct extent_buffer *eb = path->nodes[level];
-        struct btrfs_key key;
         u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF;
         int ret;
 
@@ -4828,21 +4902,6 @@ static noinline int walk_down_proc(struct btrfs_trans_handle *trans,
                 BUG_ON(wc->refs[level] == 0);
         }
 
-        if (wc->stage == DROP_REFERENCE &&
-            wc->update_ref && wc->refs[level] > 1) {
-                BUG_ON(eb == root->node);
-                BUG_ON(path->slots[level] > 0);
-                if (level == 0)
-                        btrfs_item_key_to_cpu(eb, &key, path->slots[level]);
-                else
-                        btrfs_node_key_to_cpu(eb, &key, path->slots[level]);
-                if (btrfs_header_owner(eb) == root->root_key.objectid &&
-                    btrfs_comp_cpu_keys(&key, &wc->update_progress) >= 0) {
-                        wc->stage = UPDATE_BACKREF;
-                        wc->shared_level = level;
-                }
-        }
-
         if (wc->stage == DROP_REFERENCE) {
                 if (wc->refs[level] > 1)
                         return 1;
@@ -4879,6 +4938,123 @@ static noinline int walk_down_proc(struct btrfs_trans_handle *trans,
 }
 
 /*
+ * hepler to process tree block pointer.
+ *
+ * when wc->stage == DROP_REFERENCE, this function checks
+ * reference count of the block pointed to. if the block
+ * is shared and we need update back refs for the subtree
+ * rooted at the block, this function changes wc->stage to
+ * UPDATE_BACKREF. if the block is shared and there is no
+ * need to update back, this function drops the reference
+ * to the block.
+ *
+ * NOTE: return value 1 means we should stop walking down.
+ */
+static noinline int do_walk_down(struct btrfs_trans_handle *trans,
+                                 struct btrfs_root *root,
+                                 struct btrfs_path *path,
+                                 struct walk_control *wc)
+{
+        u64 bytenr;
+        u64 generation;
+        u64 parent;
+        u32 blocksize;
+        struct btrfs_key key;
+        struct extent_buffer *next;
+        int level = wc->level;
+        int reada = 0;
+        int ret = 0;
+
+        generation = btrfs_node_ptr_generation(path->nodes[level],
+                                               path->slots[level]);
+        /*
+         * if the lower level block was created before the snapshot
+         * was created, we know there is no need to update back refs
+         * for the subtree
+         */
+        if (wc->stage == UPDATE_BACKREF &&
+            generation <= root->root_key.offset)
+                return 1;
+
+        bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]);
+        blocksize = btrfs_level_size(root, level - 1);
+
+        next = btrfs_find_tree_block(root, bytenr, blocksize);
+        if (!next) {
+                next = btrfs_find_create_tree_block(root, bytenr, blocksize);
+                reada = 1;
+        }
+        btrfs_tree_lock(next);
+        btrfs_set_lock_blocking(next);
+
+        if (wc->stage == DROP_REFERENCE) {
+                ret = btrfs_lookup_extent_info(trans, root, bytenr, blocksize,
+                                               &wc->refs[level - 1],
+                                               &wc->flags[level - 1]);
+                BUG_ON(ret);
+                BUG_ON(wc->refs[level - 1] == 0);
+
+                if (wc->refs[level - 1] > 1) {
+                        if (!wc->update_ref ||
+                            generation <= root->root_key.offset)
+                                goto skip;
+
+                        btrfs_node_key_to_cpu(path->nodes[level], &key,
+                                              path->slots[level]);
+                        ret = btrfs_comp_cpu_keys(&key, &wc->update_progress);
+                        if (ret < 0)
+                                goto skip;
+
+                        wc->stage = UPDATE_BACKREF;
+                        wc->shared_level = level - 1;
+                }
+        }
+
+        if (!btrfs_buffer_uptodate(next, generation)) {
+                btrfs_tree_unlock(next);
+                free_extent_buffer(next);
+                next = NULL;
+        }
+
+        if (!next) {
+                if (reada && level == 1)
+                        reada_walk_down(trans, root, wc, path);
+                next = read_tree_block(root, bytenr, blocksize, generation);
+                btrfs_tree_lock(next);
+                btrfs_set_lock_blocking(next);
+        }
+
+        level--;
+        BUG_ON(level != btrfs_header_level(next));
+        path->nodes[level] = next;
+        path->slots[level] = 0;
+        path->locks[level] = 1;
+        wc->level = level;
+        if (wc->level == 1)
+                wc->reada_slot = 0;
+        return 0;
+skip:
+        wc->refs[level - 1] = 0;
+        wc->flags[level - 1] = 0;
+
+        if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) {
+                parent = path->nodes[level]->start;
+        } else {
+                BUG_ON(root->root_key.objectid !=
+                       btrfs_header_owner(path->nodes[level]));
+                parent = 0;
+        }
+
+        ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent,
+                                root->root_key.objectid, level - 1, 0);
+        BUG_ON(ret);
+
+        btrfs_tree_unlock(next);
+        free_extent_buffer(next);
+        return 1;
+}
+
+/*
  * hepler to process tree block while walking up the tree.
  *
  * when wc->stage == DROP_REFERENCE, this function drops
@@ -4905,7 +5081,6 @@ static noinline int walk_up_proc(struct btrfs_trans_handle *trans,
                 if (level < wc->shared_level)
                         goto out;
 
-                BUG_ON(wc->refs[level] <= 1);
                 ret = find_next_key(path, level + 1, &wc->update_progress);
                 if (ret > 0)
                         wc->update_ref = 0;
@@ -4936,8 +5111,6 @@ static noinline int walk_up_proc(struct btrfs_trans_handle *trans,
                                 path->locks[level] = 0;
                                 return 1;
                         }
-                } else {
-                        BUG_ON(level != 0);
                 }
         }
 
@@ -4990,17 +5163,13 @@ static noinline int walk_down_tree(struct btrfs_trans_handle *trans,
                                    struct btrfs_path *path,
                                    struct walk_control *wc)
 {
-        struct extent_buffer *next;
-        struct extent_buffer *cur;
-        u64 bytenr;
-        u64 ptr_gen;
-        u32 blocksize;
         int level = wc->level;
         int ret;
 
         while (level >= 0) {
-                cur = path->nodes[level];
-                BUG_ON(path->slots[level] >= btrfs_header_nritems(cur));
+                if (path->slots[level] >=
+                    btrfs_header_nritems(path->nodes[level]))
+                        break;
 
                 ret = walk_down_proc(trans, root, path, wc);
                 if (ret > 0)
@@ -5009,20 +5178,12 @@ static noinline int walk_down_tree(struct btrfs_trans_handle *trans,
                 if (level == 0)
                         break;
 
-                bytenr = btrfs_node_blockptr(cur, path->slots[level]);
-                blocksize = btrfs_level_size(root, level - 1);
-                ptr_gen = btrfs_node_ptr_generation(cur, path->slots[level]);
-
-                next = read_tree_block(root, bytenr, blocksize, ptr_gen);
-                btrfs_tree_lock(next);
-                btrfs_set_lock_blocking(next);
-
-                level--;
-                BUG_ON(level != btrfs_header_level(next));
-                path->nodes[level] = next;
-                path->slots[level] = 0;
-                path->locks[level] = 1;
-                wc->level = level;
+                ret = do_walk_down(trans, root, path, wc);
+                if (ret > 0) {
+                        path->slots[level]++;
+                        continue;
+                }
+                level = wc->level;
         }
         return 0;
 }
@@ -5112,9 +5273,7 @@ int btrfs_drop_snapshot(struct btrfs_root *root, int update_ref)
                         err = ret;
                         goto out;
                 }
-                btrfs_node_key_to_cpu(path->nodes[level], &key,
-                                      path->slots[level]);
-                WARN_ON(memcmp(&key, &wc->update_progress, sizeof(key)));
+                WARN_ON(ret > 0);
 
                 /*
                  * unlock our path, this is safe because only this
@@ -5149,6 +5308,7 @@ int btrfs_drop_snapshot(struct btrfs_root *root, int update_ref)
         wc->stage = DROP_REFERENCE;
         wc->update_ref = update_ref;
         wc->keep_locks = 0;
+        wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root);
 
         while (1) {
                 ret = walk_down_tree(trans, root, path, wc);
@@ -5201,9 +5361,24 @@ int btrfs_drop_snapshot(struct btrfs_root *root, int update_ref)
         ret = btrfs_del_root(trans, tree_root, &root->root_key);
         BUG_ON(ret);
 
-        free_extent_buffer(root->node);
-        free_extent_buffer(root->commit_root);
-        kfree(root);
+        if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) {
+                ret = btrfs_find_last_root(tree_root, root->root_key.objectid,
+                                           NULL, NULL);
+                BUG_ON(ret < 0);
+                if (ret > 0) {
+                        ret = btrfs_del_orphan_item(trans, tree_root,
+                                                    root->root_key.objectid);
+                        BUG_ON(ret);
+                }
+        }
+
+        if (root->in_radix) {
+                btrfs_free_fs_root(tree_root->fs_info, root);
+        } else {
+                free_extent_buffer(root->node);
+                free_extent_buffer(root->commit_root);
+                kfree(root);
+        }
 out:
         btrfs_end_transaction(trans, tree_root);
         kfree(wc);
@@ -5255,6 +5430,7 @@ int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
         wc->stage = DROP_REFERENCE;
         wc->update_ref = 0;
         wc->keep_locks = 1;
+        wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root);
 
         while (1) {
                 wret = walk_down_tree(trans, root, path, wc);
@@ -5397,9 +5573,9 @@ static noinline int relocate_data_extent(struct inode *reloc_inode,
         lock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS);
         while (1) {
                 int ret;
-                spin_lock(&em_tree->lock);
+                write_lock(&em_tree->lock);
                 ret = add_extent_mapping(em_tree, em);
-                spin_unlock(&em_tree->lock);
+                write_unlock(&em_tree->lock);
                 if (ret != -EEXIST) {
                         free_extent_map(em);
                         break;
@@ -6842,287 +7018,86 @@ int btrfs_prepare_block_group_relocation(struct btrfs_root *root,
         return 0;
 }
 
-#if 0
-static int __insert_orphan_inode(struct btrfs_trans_handle *trans,
-                                 struct btrfs_root *root,
-                                 u64 objectid, u64 size)
-{
-        struct btrfs_path *path;
-        struct btrfs_inode_item *item;
-        struct extent_buffer *leaf;
-        int ret;
-
-        path = btrfs_alloc_path();
-        if (!path)
-                return -ENOMEM;
-
-        path->leave_spinning = 1;
-        ret = btrfs_insert_empty_inode(trans, root, path, objectid);
-        if (ret)
-                goto out;
-
-        leaf = path->nodes[0];
-        item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item);
-        memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item));
-        btrfs_set_inode_generation(leaf, item, 1);
-        btrfs_set_inode_size(leaf, item, size);
-        btrfs_set_inode_mode(leaf, item, S_IFREG | 0600);
-        btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NOCOMPRESS);
-        btrfs_mark_buffer_dirty(leaf);
-        btrfs_release_path(root, path);
-out:
-        btrfs_free_path(path);
-        return ret;
-}
-
-static noinline struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info,
-                                        struct btrfs_block_group_cache *group)
+/*
+ * checks to see if its even possible to relocate this block group.
+ *
+ * @return - -1 if it's not a good idea to relocate this block group, 0 if its
+ * ok to go ahead and try.
+ */
+int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr)
 {
-        struct inode *inode = NULL;
-        struct btrfs_trans_handle *trans;
-        struct btrfs_root *root;
-        struct btrfs_key root_key;
-        u64 objectid = BTRFS_FIRST_FREE_OBJECTID;
-        int err = 0;
+        struct btrfs_block_group_cache *block_group;
+        struct btrfs_space_info *space_info;
+        struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
+        struct btrfs_device *device;
+        int full = 0;
+        int ret = 0;
 
-        root_key.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID;
-        root_key.type = BTRFS_ROOT_ITEM_KEY;
-        root_key.offset = (u64)-1;
-        root = btrfs_read_fs_root_no_name(fs_info, &root_key);
-        if (IS_ERR(root))
-                return ERR_CAST(root);
+        block_group = btrfs_lookup_block_group(root->fs_info, bytenr);
 
-        trans = btrfs_start_transaction(root, 1);
-        BUG_ON(!trans);
+        /* odd, couldn't find the block group, leave it alone */
+        if (!block_group)
+                return -1;
 
-        err = btrfs_find_free_objectid(trans, root, objectid, &objectid);
-        if (err)
+        /* no bytes used, we're good */
+        if (!btrfs_block_group_used(&block_group->item))
                 goto out;
 
-        err = __insert_orphan_inode(trans, root, objectid, group->key.offset);
-        BUG_ON(err);
-
-        err = btrfs_insert_file_extent(trans, root, objectid, 0, 0, 0,
-                                       group->key.offset, 0, group->key.offset,
-                                       0, 0, 0);
-        BUG_ON(err);
-
-        inode = btrfs_iget_locked(root->fs_info->sb, objectid, root);
-        if (inode->i_state & I_NEW) {
-                BTRFS_I(inode)->root = root;
-                BTRFS_I(inode)->location.objectid = objectid;
-                BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
-                BTRFS_I(inode)->location.offset = 0;
-                btrfs_read_locked_inode(inode);
-                unlock_new_inode(inode);
-                BUG_ON(is_bad_inode(inode));
-        } else {
-                BUG_ON(1);
-        }
-        BTRFS_I(inode)->index_cnt = group->key.objectid;
-
-        err = btrfs_orphan_add(trans, inode);
-out:
-        btrfs_end_transaction(trans, root);
-        if (err) {
-                if (inode)
-                        iput(inode);
-                inode = ERR_PTR(err);
-        }
-        return inode;
-}
-
-int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len)
-{
-
-        struct btrfs_ordered_sum *sums;
-        struct btrfs_sector_sum *sector_sum;
-        struct btrfs_ordered_extent *ordered;
-        struct btrfs_root *root = BTRFS_I(inode)->root;
-        struct list_head list;
-        size_t offset;
-        int ret;
-        u64 disk_bytenr;
-
-        INIT_LIST_HEAD(&list);
-
-        ordered = btrfs_lookup_ordered_extent(inode, file_pos);
-        BUG_ON(ordered->file_offset != file_pos || ordered->len != len);
-
-        disk_bytenr = file_pos + BTRFS_I(inode)->index_cnt;
-        ret = btrfs_lookup_csums_range(root->fs_info->csum_root, disk_bytenr,
-                                       disk_bytenr + len - 1, &list);
-
-        while (!list_empty(&list)) {
-                sums = list_entry(list.next, struct btrfs_ordered_sum, list);
-                list_del_init(&sums->list);
-
-                sector_sum = sums->sums;
-                sums->bytenr = ordered->start;
+        space_info = block_group->space_info;
+        spin_lock(&space_info->lock);
 
-                offset = 0;
-                while (offset < sums->len) {
-                        sector_sum->bytenr += ordered->start - disk_bytenr;
-                        sector_sum++;
-                        offset += root->sectorsize;
-                }
+        full = space_info->full;
 
-                btrfs_add_ordered_sum(inode, ordered, sums);
+        /*
+         * if this is the last block group we have in this space, we can't
+         * relocate it unless we're able to allocate a new chunk below.
+         *
+         * Otherwise, we need to make sure we have room in the space to handle
+         * all of the extents from this block group.  If we can, we're good
+         */
+        if ((space_info->total_bytes != block_group->key.offset) &&
+           (space_info->bytes_used + space_info->bytes_reserved +
+            space_info->bytes_pinned + space_info->bytes_readonly +
+            btrfs_block_group_used(&block_group->item) <
+            space_info->total_bytes)) {
+                spin_unlock(&space_info->lock);
+                goto out;
         }
-        btrfs_put_ordered_extent(ordered);
-        return 0;
-}
-
-int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start)
-{
-        struct btrfs_trans_handle *trans;
-        struct btrfs_path *path;
-        struct btrfs_fs_info *info = root->fs_info;
-        struct extent_buffer *leaf;
-        struct inode *reloc_inode;
-        struct btrfs_block_group_cache *block_group;
-        struct btrfs_key key;
-        u64 skipped;
-        u64 cur_byte;
-        u64 total_found;
-        u32 nritems;
-        int ret;
-        int progress;
-        int pass = 0;
-
-        root = root->fs_info->extent_root;
-
-        block_group = btrfs_lookup_block_group(info, group_start);
-        BUG_ON(!block_group);
-
-        printk(KERN_INFO "btrfs relocating block group %llu flags %llu\n",
-               (unsigned long long)block_group->key.objectid,
-               (unsigned long long)block_group->flags);
-
-        path = btrfs_alloc_path();
-        BUG_ON(!path);
-
-        reloc_inode = create_reloc_inode(info, block_group);
-        BUG_ON(IS_ERR(reloc_inode));
-
-        __alloc_chunk_for_shrink(root, block_group, 1);
-        set_block_group_readonly(block_group);
-
-        btrfs_start_delalloc_inodes(info->tree_root);
-        btrfs_wait_ordered_extents(info->tree_root, 0);
-again:
-        skipped = 0;
-        total_found = 0;
-        progress = 0;
-        key.objectid = block_group->key.objectid;
-        key.offset = 0;
-        key.type = 0;
-        cur_byte = key.objectid;
-
-        trans = btrfs_start_transaction(info->tree_root, 1);
-        btrfs_commit_transaction(trans, info->tree_root);
+        spin_unlock(&space_info->lock);
 
-        mutex_lock(&root->fs_info->cleaner_mutex);
-        btrfs_clean_old_snapshots(info->tree_root);
-        btrfs_remove_leaf_refs(info->tree_root, (u64)-1, 1);
-        mutex_unlock(&root->fs_info->cleaner_mutex);
+        /*
+         * ok we don't have enough space, but maybe we have free space on our
+         * devices to allocate new chunks for relocation, so loop through our
+         * alloc devices and guess if we have enough space.  However, if we
+         * were marked as full, then we know there aren't enough chunks, and we
+         * can just return.
+         */
+        ret = -1;
+        if (full)
+                goto out;
 
-        trans = btrfs_start_transaction(info->tree_root, 1);
-        btrfs_commit_transaction(trans, info->tree_root);
+        mutex_lock(&root->fs_info->chunk_mutex);
+        list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) {
+                u64 min_free = btrfs_block_group_used(&block_group->item);
+                u64 dev_offset, max_avail;
 
-        while (1) {
-                ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
-                if (ret < 0)
-                        goto out;
-next:
-                leaf = path->nodes[0];
-                nritems = btrfs_header_nritems(leaf);
-                if (path->slots[0] >= nritems) {
-                        ret = btrfs_next_leaf(root, path);
-                        if (ret < 0)
-                                goto out;
-                        if (ret == 1) {
-                                ret = 0;
+                /*
+                 * check to make sure we can actually find a chunk with enough
+                 * space to fit our block group in.
+                 */
+                if (device->total_bytes > device->bytes_used + min_free) {
+                        ret = find_free_dev_extent(NULL, device, min_free,
+                                                   &dev_offset, &max_avail);
+                        if (!ret)
                                 break;
-                        }
-                        leaf = path->nodes[0];
-                        nritems = btrfs_header_nritems(leaf);
-                }
-
-                btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
-
-                if (key.objectid >= block_group->key.objectid +
-                    block_group->key.offset)
-                        break;
-
-                if (progress && need_resched()) {
-                        btrfs_release_path(root, path);
-                        cond_resched();
-                        progress = 0;
-                        continue;
-                }
-                progress = 1;
-
-                if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY ||
-                    key.objectid + key.offset <= cur_byte) {
-                        path->slots[0]++;
-                        goto next;
-                }
-
-                total_found++;
-                cur_byte = key.objectid + key.offset;
-                btrfs_release_path(root, path);
-
-                __alloc_chunk_for_shrink(root, block_group, 0);
-                ret = relocate_one_extent(root, path, &key, block_group,
-                                          reloc_inode, pass);
-                BUG_ON(ret < 0);
-                if (ret > 0)
-                        skipped++;
-
-                key.objectid = cur_byte;
-                key.type = 0;
-                key.offset = 0;
-        }
-
-        btrfs_release_path(root, path);
-
-        if (pass == 0) {
-                btrfs_wait_ordered_range(reloc_inode, 0, (u64)-1);
-                invalidate_mapping_pages(reloc_inode->i_mapping, 0, -1);
-        }
-
-        if (total_found > 0) {
-                printk(KERN_INFO "btrfs found %llu extents in pass %d\n",
-                       (unsigned long long)total_found, pass);
-                pass++;
-                if (total_found == skipped && pass > 2) {
-                        iput(reloc_inode);
-                        reloc_inode = create_reloc_inode(info, block_group);
-                        pass = 0;
+                        ret = -1;
                 }
-                goto again;
         }
-
-        /* delete reloc_inode */
-        iput(reloc_inode);
-
-        /* unpin extents in this range */
-        trans = btrfs_start_transaction(info->tree_root, 1);
-        btrfs_commit_transaction(trans, info->tree_root);
-
-        spin_lock(&block_group->lock);
-        WARN_ON(block_group->pinned > 0);
-        WARN_ON(block_group->reserved > 0);
-        WARN_ON(btrfs_block_group_used(&block_group->item) > 0);
-        spin_unlock(&block_group->lock);
-        btrfs_put_block_group(block_group);
-        ret = 0;
+        mutex_unlock(&root->fs_info->chunk_mutex);
 out:
-        btrfs_free_path(path);
+        btrfs_put_block_group(block_group);
         return ret;
 }
-#endif
 
 static int find_first_block_group(struct btrfs_root *root,
                 struct btrfs_path *path, struct btrfs_key *key)
@@ -7165,8 +7140,18 @@ int btrfs_free_block_groups(struct btrfs_fs_info *info)
 {
         struct btrfs_block_group_cache *block_group;
         struct btrfs_space_info *space_info;
+        struct btrfs_caching_control *caching_ctl;
         struct rb_node *n;
 
+        down_write(&info->extent_commit_sem);
+        while (!list_empty(&info->caching_block_groups)) {
+                caching_ctl = list_entry(info->caching_block_groups.next,
+                                         struct btrfs_caching_control, list);
+                list_del(&caching_ctl->list);
+                put_caching_control(caching_ctl);
+        }
+        up_write(&info->extent_commit_sem);
+
         spin_lock(&info->block_group_cache_lock);
         while ((n = rb_last(&info->block_group_cache_tree)) != NULL) {
                 block_group = rb_entry(n, struct btrfs_block_group_cache,
@@ -7180,8 +7165,7 @@ int btrfs_free_block_groups(struct btrfs_fs_info *info)
                 up_write(&block_group->space_info->groups_sem);
 
                 if (block_group->cached == BTRFS_CACHE_STARTED)
-                        wait_event(block_group->caching_q,
-                                   block_group_cache_done(block_group));
+                        wait_block_group_cache_done(block_group);
 
                 btrfs_remove_free_space_cache(block_group);
 
@@ -7251,7 +7235,6 @@ int btrfs_read_block_groups(struct btrfs_root *root)
                 spin_lock_init(&cache->lock);
                 spin_lock_init(&cache->tree_lock);
                 cache->fs_info = info;
-                init_waitqueue_head(&cache->caching_q);
                 INIT_LIST_HEAD(&cache->list);
                 INIT_LIST_HEAD(&cache->cluster_list);
 
@@ -7273,8 +7256,6 @@ int btrfs_read_block_groups(struct btrfs_root *root)
                 cache->flags = btrfs_block_group_flags(&cache->item);
                 cache->sectorsize = root->sectorsize;
 
-                remove_sb_from_cache(root, cache);
-
                 /*
                  * check for two cases, either we are full, and therefore
                  * don't need to bother with the caching work since we won't
@@ -7283,13 +7264,19 @@ int btrfs_read_block_groups(struct btrfs_root *root)
                  * time, particularly in the full case.
                  */
                 if (found_key.offset == btrfs_block_group_used(&cache->item)) {
+                        exclude_super_stripes(root, cache);
+                        cache->last_byte_to_unpin = (u64)-1;
                         cache->cached = BTRFS_CACHE_FINISHED;
+                        free_excluded_extents(root, cache);
                 } else if (btrfs_block_group_used(&cache->item) == 0) {
+                        exclude_super_stripes(root, cache);
+                        cache->last_byte_to_unpin = (u64)-1;
                         cache->cached = BTRFS_CACHE_FINISHED;
                         add_new_free_space(cache, root->fs_info,
                                            found_key.objectid,
                                            found_key.objectid +
                                            found_key.offset);
+                        free_excluded_extents(root, cache);
                 }
 
                 ret = update_space_info(info, cache->flags, found_key.offset,
@@ -7297,6 +7284,10 @@ int btrfs_read_block_groups(struct btrfs_root *root)
                                         &space_info);
                 BUG_ON(ret);
                 cache->space_info = space_info;
+                spin_lock(&cache->space_info->lock);
+                cache->space_info->bytes_super += cache->bytes_super;
+                spin_unlock(&cache->space_info->lock);
+
                 down_write(&space_info->groups_sem);
                 list_add_tail(&cache->list, &space_info->block_groups);
                 up_write(&space_info->groups_sem);
@@ -7346,7 +7337,6 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans,
         atomic_set(&cache->count, 1);
         spin_lock_init(&cache->lock);
         spin_lock_init(&cache->tree_lock);
-        init_waitqueue_head(&cache->caching_q);
         INIT_LIST_HEAD(&cache->list);
         INIT_LIST_HEAD(&cache->cluster_list);
 
@@ -7355,15 +7345,23 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans,
         cache->flags = type;
         btrfs_set_block_group_flags(&cache->item, type);
 
+        cache->last_byte_to_unpin = (u64)-1;
         cache->cached = BTRFS_CACHE_FINISHED;
-        remove_sb_from_cache(root, cache);
+        exclude_super_stripes(root, cache);
 
         add_new_free_space(cache, root->fs_info, chunk_offset,
                            chunk_offset + size);
 
+        free_excluded_extents(root, cache);
+
         ret = update_space_info(root->fs_info, cache->flags, size, bytes_used,
                                 &cache->space_info);
         BUG_ON(ret);
+
+        spin_lock(&cache->space_info->lock);
+        cache->space_info->bytes_super += cache->bytes_super;
+        spin_unlock(&cache->space_info->lock);
+
         down_write(&cache->space_info->groups_sem);
         list_add_tail(&cache->list, &cache->space_info->block_groups);
         up_write(&cache->space_info->groups_sem);
@@ -7429,8 +7427,7 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
         up_write(&block_group->space_info->groups_sem);
 
         if (block_group->cached == BTRFS_CACHE_STARTED)
-                wait_event(block_group->caching_q,
-                           block_group_cache_done(block_group));
+                wait_block_group_cache_done(block_group);
 
         btrfs_remove_free_space_cache(block_group);
 
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 68260180f587..de1793ba004a 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -280,6 +280,14 @@ static struct extent_buffer *buffer_search(struct extent_io_tree *tree,
         return NULL;
 }
 
+static void merge_cb(struct extent_io_tree *tree, struct extent_state *new,
+                     struct extent_state *other)
+{
+        if (tree->ops && tree->ops->merge_extent_hook)
+                tree->ops->merge_extent_hook(tree->mapping->host, new,
+                                             other);
+}
+
 /*
  * utility function to look for merge candidates inside a given range.
  * Any extents with matching state are merged together into a single
@@ -303,6 +311,7 @@ static int merge_state(struct extent_io_tree *tree,
                 other = rb_entry(other_node, struct extent_state, rb_node);
                 if (other->end == state->start - 1 &&
                     other->state == state->state) {
+                        merge_cb(tree, state, other);
                         state->start = other->start;
                         other->tree = NULL;
                         rb_erase(&other->rb_node, &tree->state);
@@ -314,33 +323,37 @@ static int merge_state(struct extent_io_tree *tree,
                 other = rb_entry(other_node, struct extent_state, rb_node);
                 if (other->start == state->end + 1 &&
                     other->state == state->state) {
+                        merge_cb(tree, state, other);
                         other->start = state->start;
                         state->tree = NULL;
                         rb_erase(&state->rb_node, &tree->state);
                         free_extent_state(state);
+                        state = NULL;
                 }
         }
+
         return 0;
 }
 
-static void set_state_cb(struct extent_io_tree *tree,
+static int set_state_cb(struct extent_io_tree *tree,
                          struct extent_state *state,
                          unsigned long bits)
 {
         if (tree->ops && tree->ops->set_bit_hook) {
-                tree->ops->set_bit_hook(tree->mapping->host, state->start,
-                                        state->end, state->state, bits);
+                return tree->ops->set_bit_hook(tree->mapping->host,
+                                               state->start, state->end,
+                                               state->state, bits);
         }
+
+        return 0;
 }
 
 static void clear_state_cb(struct extent_io_tree *tree,
                            struct extent_state *state,
                            unsigned long bits)
 {
-        if (tree->ops && tree->ops->clear_bit_hook) {
-                tree->ops->clear_bit_hook(tree->mapping->host, state->start,
-                                          state->end, state->state, bits);
-        }
+        if (tree->ops && tree->ops->clear_bit_hook)
+                tree->ops->clear_bit_hook(tree->mapping->host, state, bits);
 }
 
 /*
@@ -358,6 +371,7 @@ static int insert_state(struct extent_io_tree *tree,
                         int bits)
 {
         struct rb_node *node;
+        int ret;
 
         if (end < start) {
                 printk(KERN_ERR "btrfs end < start %llu %llu\n",
@@ -365,12 +379,15 @@ static int insert_state(struct extent_io_tree *tree,
                        (unsigned long long)start);
                 WARN_ON(1);
         }
+        state->start = start;
+        state->end = end;
+        ret = set_state_cb(tree, state, bits);
+        if (ret)
+                return ret;
+
         if (bits & EXTENT_DIRTY)
                 tree->dirty_bytes += end - start + 1;
-        set_state_cb(tree, state, bits);
         state->state |= bits;
-        state->start = start;
-        state->end = end;
         node = tree_insert(&tree->state, end, &state->rb_node);
         if (node) {
                 struct extent_state *found;
@@ -387,6 +404,15 @@ static int insert_state(struct extent_io_tree *tree,
         return 0;
 }
 
+static int split_cb(struct extent_io_tree *tree, struct extent_state *orig,
+                     u64 split)
+{
+        if (tree->ops && tree->ops->split_extent_hook)
+                return tree->ops->split_extent_hook(tree->mapping->host,
+                                                    orig, split);
+        return 0;
+}
+
 /*
  * split a given extent state struct in two, inserting the preallocated
  * struct 'prealloc' as the newly created second half.  'split' indicates an
@@ -405,6 +431,9 @@ static int split_state(struct extent_io_tree *tree, struct extent_state *orig,
                        struct extent_state *prealloc, u64 split)
 {
         struct rb_node *node;
+
+        split_cb(tree, orig, split);
+
         prealloc->start = orig->start;
         prealloc->end = split - 1;
         prealloc->state = orig->state;
@@ -471,10 +500,14 @@ static int clear_state_bit(struct extent_io_tree *tree,
  * bits were already set, or zero if none of the bits were already set.
  */
 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
-                     int bits, int wake, int delete, gfp_t mask)
+                     int bits, int wake, int delete,
+                     struct extent_state **cached_state,
+                     gfp_t mask)
 {
         struct extent_state *state;
+        struct extent_state *cached;
         struct extent_state *prealloc = NULL;
+        struct rb_node *next_node;
         struct rb_node *node;
         u64 last_end;
         int err;
@@ -488,6 +521,17 @@ again:
         }
 
         spin_lock(&tree->lock);
+        if (cached_state) {
+                cached = *cached_state;
+                *cached_state = NULL;
+                cached_state = NULL;
+                if (cached && cached->tree && cached->start == start) {
+                        atomic_dec(&cached->refs);
+                        state = cached;
+                        goto hit_next;
+                }
+                free_extent_state(cached);
+        }
         /*
          * this search will find the extents that end after
          * our range starts
@@ -496,6 +540,7 @@ again:
         if (!node)
                 goto out;
         state = rb_entry(node, struct extent_state, rb_node);
+hit_next:
         if (state->start > end)
                 goto out;
         WARN_ON(state->end < start);
@@ -526,13 +571,11 @@ again:
                 if (err)
                         goto out;
                 if (state->end <= end) {
-                        set |= clear_state_bit(tree, state, bits,
-                                        wake, delete);
+                        set |= clear_state_bit(tree, state, bits, wake,
+                                               delete);
                         if (last_end == (u64)-1)
                                 goto out;
                         start = last_end + 1;
-                } else {
-                        start = state->start;
                 }
                 goto search_again;
         }
@@ -547,19 +590,30 @@ again:
                         prealloc = alloc_extent_state(GFP_ATOMIC);
                 err = split_state(tree, state, prealloc, end + 1);
                 BUG_ON(err == -EEXIST);
-
                 if (wake)
                         wake_up(&state->wq);
-                set |= clear_state_bit(tree, prealloc, bits,
-                                       wake, delete);
+
+                set |= clear_state_bit(tree, prealloc, bits, wake, delete);
+
                 prealloc = NULL;
                 goto out;
         }
 
+        if (state->end < end && prealloc && !need_resched())
+                next_node = rb_next(&state->rb_node);
+        else
+                next_node = NULL;
+
         set |= clear_state_bit(tree, state, bits, wake, delete);
         if (last_end == (u64)-1)
                 goto out;
         start = last_end + 1;
+        if (start <= end && next_node) {
+                state = rb_entry(next_node, struct extent_state,
+                                 rb_node);
+                if (state->start == start)
+                        goto hit_next;
+        }
         goto search_again;
 
 out:
@@ -641,40 +695,59 @@ out:
         return 0;
 }
 
-static void set_state_bits(struct extent_io_tree *tree,
+static int set_state_bits(struct extent_io_tree *tree,
                            struct extent_state *state,
                            int bits)
 {
+        int ret;
+
+        ret = set_state_cb(tree, state, bits);
+        if (ret)
+                return ret;
+
         if ((bits & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) {
                 u64 range = state->end - state->start + 1;
                 tree->dirty_bytes += range;
         }
-        set_state_cb(tree, state, bits);
         state->state |= bits;
+
+        return 0;
+}
+
+static void cache_state(struct extent_state *state,
+                        struct extent_state **cached_ptr)
+{
+        if (cached_ptr && !(*cached_ptr)) {
+                if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) {
+                        *cached_ptr = state;
+                        atomic_inc(&state->refs);
+                }
+        }
 }
 
 /*
- * set some bits on a range in the tree.  This may require allocations
- * or sleeping, so the gfp mask is used to indicate what is allowed.
+ * set some bits on a range in the tree.  This may require allocations or
+ * sleeping, so the gfp mask is used to indicate what is allowed.
  *
- * If 'exclusive' == 1, this will fail with -EEXIST if some part of the
- * range already has the desired bits set.  The start of the existing
- * range is returned in failed_start in this case.
+ * If any of the exclusive bits are set, this will fail with -EEXIST if some
+ * part of the range already has the desired bits set.  The start of the
+ * existing range is returned in failed_start in this case.
  *
- * [start, end] is inclusive
- * This takes the tree lock.
+ * [start, end] is inclusive This takes the tree lock.
  */
+
 static int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
-                          int bits, int exclusive, u64 *failed_start,
+                          int bits, int exclusive_bits, u64 *failed_start,
+                          struct extent_state **cached_state,
                           gfp_t mask)
 {
         struct extent_state *state;
         struct extent_state *prealloc = NULL;
         struct rb_node *node;
         int err = 0;
-        int set;
         u64 last_start;
         u64 last_end;
+
 again:
         if (!prealloc && (mask & __GFP_WAIT)) {
                 prealloc = alloc_extent_state(mask);
@@ -683,6 +756,13 @@ again:
         }
 
         spin_lock(&tree->lock);
+        if (cached_state && *cached_state) {
+                state = *cached_state;
+                if (state->start == start && state->tree) {
+                        node = &state->rb_node;
+                        goto hit_next;
+                }
+        }
         /*
          * this search will find all the extents that end after
          * our range starts.
@@ -694,8 +774,8 @@ again:
                 BUG_ON(err == -EEXIST);
                 goto out;
         }
-
         state = rb_entry(node, struct extent_state, rb_node);
+hit_next:
         last_start = state->start;
         last_end = state->end;
 
@@ -706,17 +786,32 @@ again:
          * Just lock what we found and keep going
          */
         if (state->start == start && state->end <= end) {
-                set = state->state & bits;
-                if (set && exclusive) {
+                struct rb_node *next_node;
+                if (state->state & exclusive_bits) {
                         *failed_start = state->start;
                         err = -EEXIST;
                         goto out;
                 }
-                set_state_bits(tree, state, bits);
+
+                err = set_state_bits(tree, state, bits);
+                if (err)
+                        goto out;
+
+                cache_state(state, cached_state);
                 merge_state(tree, state);
                 if (last_end == (u64)-1)
                         goto out;
+
                 start = last_end + 1;
+                if (start < end && prealloc && !need_resched()) {
+                        next_node = rb_next(node);
+                        if (next_node) {
+                                state = rb_entry(next_node, struct extent_state,
+                                                 rb_node);
+                                if (state->start == start)
+                                        goto hit_next;
+                        }
+                }
                 goto search_again;
         }
 
@@ -737,8 +832,7 @@ again:
          * desired bit on it.
          */
         if (state->start < start) {
-                set = state->state & bits;
-                if (exclusive && set) {
+                if (state->state & exclusive_bits) {
                         *failed_start = start;
                         err = -EEXIST;
                         goto out;
@@ -749,13 +843,14 @@ again:
                 if (err)
                         goto out;
                 if (state->end <= end) {
-                        set_state_bits(tree, state, bits);
+                        err = set_state_bits(tree, state, bits);
+                        if (err)
+                                goto out;
+                        cache_state(state, cached_state);
                         merge_state(tree, state);
                         if (last_end == (u64)-1)
                                 goto out;
                         start = last_end + 1;
-                } else {
-                        start = state->start;
                 }
                 goto search_again;
         }
@@ -774,10 +869,13 @@ again:
                         this_end = last_start - 1;
                 err = insert_state(tree, prealloc, start, this_end,
                                    bits);
-                prealloc = NULL;
                 BUG_ON(err == -EEXIST);
-                if (err)
+                if (err) {
+                        prealloc = NULL;
                         goto out;
+                }
+                cache_state(prealloc, cached_state);
+                prealloc = NULL;
                 start = this_end + 1;
                 goto search_again;
         }
@@ -788,8 +886,7 @@ again:
          * on the first half
          */
         if (state->start <= end && state->end > end) {
-                set = state->state & bits;
-                if (exclusive && set) {
+                if (state->state & exclusive_bits) {
                         *failed_start = start;
                         err = -EEXIST;
                         goto out;
@@ -797,7 +894,12 @@ again:
                 err = split_state(tree, state, prealloc, end + 1);
                 BUG_ON(err == -EEXIST);
 
-                set_state_bits(tree, prealloc, bits);
+                err = set_state_bits(tree, prealloc, bits);
+                if (err) {
+                        prealloc = NULL;
+                        goto out;
+                }
+                cache_state(prealloc, cached_state);
                 merge_state(tree, prealloc);
                 prealloc = NULL;
                 goto out;
@@ -826,86 +928,64 @@ int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
                      gfp_t mask)
 {
         return set_extent_bit(tree, start, end, EXTENT_DIRTY, 0, NULL,
-                              mask);
-}
-
-int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
-                       gfp_t mask)
-{
-        return set_extent_bit(tree, start, end, EXTENT_ORDERED, 0, NULL, mask);
+                              NULL, mask);
 }
 
 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
                     int bits, gfp_t mask)
 {
         return set_extent_bit(tree, start, end, bits, 0, NULL,
-                              mask);
+                              NULL, mask);
 }
 
 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
                       int bits, gfp_t mask)
 {
-        return clear_extent_bit(tree, start, end, bits, 0, 0, mask);
+        return clear_extent_bit(tree, start, end, bits, 0, 0, NULL, mask);
 }
 
 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
                      gfp_t mask)
 {
         return set_extent_bit(tree, start, end,
-                              EXTENT_DELALLOC | EXTENT_DIRTY,
-                              0, NULL, mask);
+                              EXTENT_DELALLOC | EXTENT_DIRTY | EXTENT_UPTODATE,
+                              0, NULL, NULL, mask);
 }
 
 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
                        gfp_t mask)
 {
         return clear_extent_bit(tree, start, end,
-                                EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, mask);
-}
-
-int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
-                         gfp_t mask)
-{
-        return clear_extent_bit(tree, start, end, EXTENT_ORDERED, 1, 0, mask);
+                                EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0,
+                                NULL, mask);
 }
 
 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
                      gfp_t mask)
 {
         return set_extent_bit(tree, start, end, EXTENT_NEW, 0, NULL,
-                              mask);
+                              NULL, mask);
 }
 
 static int clear_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
                        gfp_t mask)
 {
-        return clear_extent_bit(tree, start, end, EXTENT_NEW, 0, 0, mask);
+        return clear_extent_bit(tree, start, end, EXTENT_NEW, 0, 0,
+                                NULL, mask);
 }
 
 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
                         gfp_t mask)
 {
         return set_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, NULL,
-                              mask);
+                              NULL, mask);
 }
 
 static int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
                                  u64 end, gfp_t mask)
 {
-        return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, mask);
-}
-
-static int set_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end,
-                         gfp_t mask)
-{
-        return set_extent_bit(tree, start, end, EXTENT_WRITEBACK,
-                              0, NULL, mask);
-}
-
-static int clear_extent_writeback(struct extent_io_tree *tree, u64 start,
-                                  u64 end, gfp_t mask)
-{
-        return clear_extent_bit(tree, start, end, EXTENT_WRITEBACK, 1, 0, mask);
+        return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
+                                NULL, mask);
 }
 
 int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end)
@@ -917,13 +997,15 @@ int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end)
  * either insert or lock state struct between start and end use mask to tell
  * us if waiting is desired.
  */
-int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask)
+int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
+                     int bits, struct extent_state **cached_state, gfp_t mask)
 {
         int err;
         u64 failed_start;
         while (1) {
-                err = set_extent_bit(tree, start, end, EXTENT_LOCKED, 1,
-                                     &failed_start, mask);
+                err = set_extent_bit(tree, start, end, EXTENT_LOCKED | bits,
+                                     EXTENT_LOCKED, &failed_start,
+                                     cached_state, mask);
                 if (err == -EEXIST && (mask & __GFP_WAIT)) {
                         wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED);
                         start = failed_start;
@@ -935,27 +1017,40 @@ int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask)
         return err;
 }
 
+int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask)
+{
+        return lock_extent_bits(tree, start, end, 0, NULL, mask);
+}
+
 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
                     gfp_t mask)
 {
         int err;
         u64 failed_start;
 
-        err = set_extent_bit(tree, start, end, EXTENT_LOCKED, 1,
-                             &failed_start, mask);
+        err = set_extent_bit(tree, start, end, EXTENT_LOCKED, EXTENT_LOCKED,
+                             &failed_start, NULL, mask);
         if (err == -EEXIST) {
                 if (failed_start > start)
                         clear_extent_bit(tree, start, failed_start - 1,
-                                         EXTENT_LOCKED, 1, 0, mask);
+                                         EXTENT_LOCKED, 1, 0, NULL, mask);
                 return 0;
         }
         return 1;
 }
 
+int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
+                         struct extent_state **cached, gfp_t mask)
+{
+        return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
+                                mask);
+}
+
 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end,
                   gfp_t mask)
 {
-        return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, mask);
+        return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL,
+                                mask);
 }
 
 /*
@@ -974,7 +1069,6 @@ int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end)
                 page_cache_release(page);
                 index++;
         }
-        set_extent_dirty(tree, start, end, GFP_NOFS);
         return 0;
 }
 
@@ -994,7 +1088,6 @@ static int set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end)
                 page_cache_release(page);
                 index++;
         }
-        set_extent_writeback(tree, start, end, GFP_NOFS);
         return 0;
 }
 
@@ -1232,6 +1325,7 @@ static noinline u64 find_lock_delalloc_range(struct inode *inode,
         u64 delalloc_start;
         u64 delalloc_end;
         u64 found;
+        struct extent_state *cached_state = NULL;
         int ret;
         int loops = 0;
 
@@ -1269,6 +1363,7 @@ again:
                 /* some of the pages are gone, lets avoid looping by
                  * shortening the size of the delalloc range we're searching
                  */
+                free_extent_state(cached_state);
                 if (!loops) {
                         unsigned long offset = (*start) & (PAGE_CACHE_SIZE - 1);
                         max_bytes = PAGE_CACHE_SIZE - offset;
@@ -1282,18 +1377,21 @@ again:
         BUG_ON(ret);
 
         /* step three, lock the state bits for the whole range */
-        lock_extent(tree, delalloc_start, delalloc_end, GFP_NOFS);
+        lock_extent_bits(tree, delalloc_start, delalloc_end,
+                         0, &cached_state, GFP_NOFS);
 
         /* then test to make sure it is all still delalloc */
         ret = test_range_bit(tree, delalloc_start, delalloc_end,
-                             EXTENT_DELALLOC, 1);
+                             EXTENT_DELALLOC, 1, cached_state);
         if (!ret) {
-                unlock_extent(tree, delalloc_start, delalloc_end, GFP_NOFS);
+                unlock_extent_cached(tree, delalloc_start, delalloc_end,
+                                     &cached_state, GFP_NOFS);
                 __unlock_for_delalloc(inode, locked_page,
                               delalloc_start, delalloc_end);
                 cond_resched();
                 goto again;
         }
+        free_extent_state(cached_state);
         *start = delalloc_start;
         *end = delalloc_end;
 out_failed:
@@ -1307,7 +1405,8 @@ int extent_clear_unlock_delalloc(struct inode *inode,
                                 int clear_unlock,
                                 int clear_delalloc, int clear_dirty,
                                 int set_writeback,
-                                int end_writeback)
+                                int end_writeback,
+                                int set_private2)
 {
         int ret;
         struct page *pages[16];
@@ -1325,8 +1424,9 @@ int extent_clear_unlock_delalloc(struct inode *inode,
         if (clear_delalloc)
                 clear_bits |= EXTENT_DELALLOC;
 
-        clear_extent_bit(tree, start, end, clear_bits, 1, 0, GFP_NOFS);
-        if (!(unlock_pages || clear_dirty || set_writeback || end_writeback))
+        clear_extent_bit(tree, start, end, clear_bits, 1, 0, NULL, GFP_NOFS);
+        if (!(unlock_pages || clear_dirty || set_writeback || end_writeback ||
+              set_private2))
                 return 0;
 
         while (nr_pages > 0) {
@@ -1334,6 +1434,10 @@ int extent_clear_unlock_delalloc(struct inode *inode,
                                      min_t(unsigned long,
                                      nr_pages, ARRAY_SIZE(pages)), pages);
                 for (i = 0; i < ret; i++) {
+
+                        if (set_private2)
+                                SetPagePrivate2(pages[i]);
+
                         if (pages[i] == locked_page) {
                                 page_cache_release(pages[i]);
                                 continue;
@@ -1476,14 +1580,17 @@ out:
  * range is found set.
  */
 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
-                   int bits, int filled)
+                   int bits, int filled, struct extent_state *cached)
 {
         struct extent_state *state = NULL;
         struct rb_node *node;
         int bitset = 0;
 
         spin_lock(&tree->lock);
-        node = tree_search(tree, start);
+        if (cached && cached->tree && cached->start == start)
+                node = &cached->rb_node;
+        else
+                node = tree_search(tree, start);
         while (node && start <= end) {
                 state = rb_entry(node, struct extent_state, rb_node);
 
@@ -1503,6 +1610,10 @@ int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
                         bitset = 0;
                         break;
                 }
+
+                if (state->end == (u64)-1)
+                        break;
+
                 start = state->end + 1;
                 if (start > end)
                         break;
@@ -1526,7 +1637,7 @@ static int check_page_uptodate(struct extent_io_tree *tree,
 {
         u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
         u64 end = start + PAGE_CACHE_SIZE - 1;
-        if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1))
+        if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1, NULL))
                 SetPageUptodate(page);
         return 0;
 }
@@ -1540,7 +1651,7 @@ static int check_page_locked(struct extent_io_tree *tree,
 {
         u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
         u64 end = start + PAGE_CACHE_SIZE - 1;
-        if (!test_range_bit(tree, start, end, EXTENT_LOCKED, 0))
+        if (!test_range_bit(tree, start, end, EXTENT_LOCKED, 0, NULL))
                 unlock_page(page);
         return 0;
 }
@@ -1552,10 +1663,7 @@ static int check_page_locked(struct extent_io_tree *tree,
 static int check_page_writeback(struct extent_io_tree *tree,
                              struct page *page)
 {
-        u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
-        u64 end = start + PAGE_CACHE_SIZE - 1;
-        if (!test_range_bit(tree, start, end, EXTENT_WRITEBACK, 0))
-                end_page_writeback(page);
+        end_page_writeback(page);
         return 0;
 }
 
@@ -1613,13 +1721,11 @@ static void end_bio_extent_writepage(struct bio *bio, int err)
                 }
 
                 if (!uptodate) {
-                        clear_extent_uptodate(tree, start, end, GFP_ATOMIC);
+                        clear_extent_uptodate(tree, start, end, GFP_NOFS);
                         ClearPageUptodate(page);
                         SetPageError(page);
                 }
 
-                clear_extent_writeback(tree, start, end, GFP_ATOMIC);
-
                 if (whole_page)
                         end_page_writeback(page);
                 else
@@ -1983,7 +2089,8 @@ static int __extent_read_full_page(struct extent_io_tree *tree,
                         continue;
                 }
                 /* the get_extent function already copied into the page */
-                if (test_range_bit(tree, cur, cur_end, EXTENT_UPTODATE, 1)) {
+                if (test_range_bit(tree, cur, cur_end,
+                                   EXTENT_UPTODATE, 1, NULL)) {
                         check_page_uptodate(tree, page);
                         unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS);
                         cur = cur + iosize;
@@ -2078,6 +2185,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
         u64 iosize;
         u64 unlock_start;
         sector_t sector;
+        struct extent_state *cached_state = NULL;
         struct extent_map *em;
         struct block_device *bdev;
         int ret;
@@ -2124,6 +2232,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
         delalloc_end = 0;
         page_started = 0;
         if (!epd->extent_locked) {
+                u64 delalloc_to_write = 0;
                 /*
                  * make sure the wbc mapping index is at least updated
                  * to this page.
@@ -2143,8 +2252,24 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
                         tree->ops->fill_delalloc(inode, page, delalloc_start,
                                                  delalloc_end, &page_started,
                                                  &nr_written);
+                        /*
+                         * delalloc_end is already one less than the total
+                         * length, so we don't subtract one from
+                         * PAGE_CACHE_SIZE
+                         */
+                        delalloc_to_write += (delalloc_end - delalloc_start +
+                                              PAGE_CACHE_SIZE) >>
+                                              PAGE_CACHE_SHIFT;
                         delalloc_start = delalloc_end + 1;
                 }
+                if (wbc->nr_to_write < delalloc_to_write) {
+                        int thresh = 8192;
+
+                        if (delalloc_to_write < thresh * 2)
+                                thresh = delalloc_to_write;
+                        wbc->nr_to_write = min_t(u64, delalloc_to_write,
+                                                 thresh);
+                }
 
                 /* did the fill delalloc function already unlock and start
                  * the IO?
@@ -2160,15 +2285,10 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
                         goto done_unlocked;
                 }
         }
-        lock_extent(tree, start, page_end, GFP_NOFS);
-
-        unlock_start = start;
-
         if (tree->ops && tree->ops->writepage_start_hook) {
                 ret = tree->ops->writepage_start_hook(page, start,
                                                       page_end);
                 if (ret == -EAGAIN) {
-                        unlock_extent(tree, start, page_end, GFP_NOFS);
                         redirty_page_for_writepage(wbc, page);
                         update_nr_written(page, wbc, nr_written);
                         unlock_page(page);
@@ -2184,12 +2304,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
         update_nr_written(page, wbc, nr_written + 1);
 
         end = page_end;
-        if (test_range_bit(tree, start, page_end, EXTENT_DELALLOC, 0))
-                printk(KERN_ERR "btrfs delalloc bits after lock_extent\n");
-
         if (last_byte <= start) {
-                clear_extent_dirty(tree, start, page_end, GFP_NOFS);
-                unlock_extent(tree, start, page_end, GFP_NOFS);
                 if (tree->ops && tree->ops->writepage_end_io_hook)
                         tree->ops->writepage_end_io_hook(page, start,
                                                          page_end, NULL, 1);
@@ -2197,13 +2312,10 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
                 goto done;
         }
 
-        set_extent_uptodate(tree, start, page_end, GFP_NOFS);
         blocksize = inode->i_sb->s_blocksize;
 
         while (cur <= end) {
                 if (cur >= last_byte) {
-                        clear_extent_dirty(tree, cur, page_end, GFP_NOFS);
-                        unlock_extent(tree, unlock_start, page_end, GFP_NOFS);
                         if (tree->ops && tree->ops->writepage_end_io_hook)
                                 tree->ops->writepage_end_io_hook(page, cur,
                                                          page_end, NULL, 1);
@@ -2235,12 +2347,6 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
                  */
                 if (compressed || block_start == EXTENT_MAP_HOLE ||
                     block_start == EXTENT_MAP_INLINE) {
-                        clear_extent_dirty(tree, cur,
-                                           cur + iosize - 1, GFP_NOFS);
-
-                        unlock_extent(tree, unlock_start, cur + iosize - 1,
-                                      GFP_NOFS);
-
                         /*
                          * end_io notification does not happen here for
                          * compressed extents
@@ -2265,13 +2371,12 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
                 }
                 /* leave this out until we have a page_mkwrite call */
                 if (0 && !test_range_bit(tree, cur, cur + iosize - 1,
-                                   EXTENT_DIRTY, 0)) {
+                                   EXTENT_DIRTY, 0, NULL)) {
                         cur = cur + iosize;
                         pg_offset += iosize;
                         continue;
                 }
 
-                clear_extent_dirty(tree, cur, cur + iosize - 1, GFP_NOFS);
                 if (tree->ops && tree->ops->writepage_io_hook) {
                         ret = tree->ops->writepage_io_hook(page, cur,
                                                 cur + iosize - 1);
@@ -2309,12 +2414,12 @@ done:
                 set_page_writeback(page);
                 end_page_writeback(page);
         }
-        if (unlock_start <= page_end)
-                unlock_extent(tree, unlock_start, page_end, GFP_NOFS);
         unlock_page(page);
 
 done_unlocked:
 
+        /* drop our reference on any cached states */
+        free_extent_state(cached_state);
         return 0;
 }
 
@@ -2339,9 +2444,9 @@ static int extent_write_cache_pages(struct extent_io_tree *tree,
                              writepage_t writepage, void *data,
                              void (*flush_fn)(void *))
 {
-        struct backing_dev_info *bdi = mapping->backing_dev_info;
         int ret = 0;
         int done = 0;
+        int nr_to_write_done = 0;
         struct pagevec pvec;
         int nr_pages;
         pgoff_t index;
@@ -2361,7 +2466,7 @@ static int extent_write_cache_pages(struct extent_io_tree *tree,
                 scanned = 1;
         }
 retry:
-        while (!done && (index <= end) &&
+        while (!done && !nr_to_write_done && (index <= end) &&
                (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
                               PAGECACHE_TAG_DIRTY, min(end - index,
                                   (pgoff_t)PAGEVEC_SIZE-1) + 1))) {
@@ -2412,12 +2517,15 @@ retry:
                                 unlock_page(page);
                                 ret = 0;
                         }
-                        if (ret || wbc->nr_to_write <= 0)
-                                done = 1;
-                        if (wbc->nonblocking && bdi_write_congested(bdi)) {
-                                wbc->encountered_congestion = 1;
+                        if (ret)
                                 done = 1;
-                        }
+
+                        /*
+                         * the filesystem may choose to bump up nr_to_write.
+                         * We have to make sure to honor the new nr_to_write
+                         * at any time
+                         */
+                        nr_to_write_done = wbc->nr_to_write <= 0;
                 }
                 pagevec_release(&pvec);
                 cond_resched();
@@ -2604,10 +2712,10 @@ int extent_invalidatepage(struct extent_io_tree *tree,
                 return 0;
 
         lock_extent(tree, start, end, GFP_NOFS);
-        wait_on_extent_writeback(tree, start, end);
+        wait_on_page_writeback(page);
         clear_extent_bit(tree, start, end,
                          EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC,
-                         1, 1, GFP_NOFS);
+                         1, 1, NULL, GFP_NOFS);
         return 0;
 }
 
@@ -2687,7 +2795,7 @@ int extent_prepare_write(struct extent_io_tree *tree,
                     !isnew && !PageUptodate(page) &&
                     (block_off_end > to || block_off_start < from) &&
                     !test_range_bit(tree, block_start, cur_end,
-                                    EXTENT_UPTODATE, 1)) {
+                                    EXTENT_UPTODATE, 1, NULL)) {
                         u64 sector;
                         u64 extent_offset = block_start - em->start;
                         size_t iosize;
@@ -2701,7 +2809,7 @@ int extent_prepare_write(struct extent_io_tree *tree,
                          */
                         set_extent_bit(tree, block_start,
                                        block_start + iosize - 1,
-                                       EXTENT_LOCKED, 0, NULL, GFP_NOFS);
+                                       EXTENT_LOCKED, 0, NULL, NULL, GFP_NOFS);
                         ret = submit_extent_page(READ, tree, page,
                                          sector, iosize, page_offset, em->bdev,
                                          NULL, 1,
@@ -2742,13 +2850,18 @@ int try_release_extent_state(struct extent_map_tree *map,
         int ret = 1;
 
         if (test_range_bit(tree, start, end,
-                           EXTENT_IOBITS | EXTENT_ORDERED, 0))
+                           EXTENT_IOBITS, 0, NULL))
                 ret = 0;
         else {
                 if ((mask & GFP_NOFS) == GFP_NOFS)
                         mask = GFP_NOFS;
-                clear_extent_bit(tree, start, end, EXTENT_UPTODATE,
-                                 1, 1, mask);
+                /*
+                 * at this point we can safely clear everything except the
+                 * locked bit and the nodatasum bit
+                 */
+                clear_extent_bit(tree, start, end,
+                                 ~(EXTENT_LOCKED | EXTENT_NODATASUM),
+                                 0, 0, NULL, mask);
         }
         return ret;
 }
@@ -2771,29 +2884,28 @@ int try_release_extent_mapping(struct extent_map_tree *map,
                 u64 len;
                 while (start <= end) {
                         len = end - start + 1;
-                        spin_lock(&map->lock);
+                        write_lock(&map->lock);
                         em = lookup_extent_mapping(map, start, len);
                         if (!em || IS_ERR(em)) {
-                                spin_unlock(&map->lock);
+                                write_unlock(&map->lock);
                                 break;
                         }
                         if (test_bit(EXTENT_FLAG_PINNED, &em->flags) ||
                             em->start != start) {
-                                spin_unlock(&map->lock);
+                                write_unlock(&map->lock);
                                 free_extent_map(em);
                                 break;
                         }
                         if (!test_range_bit(tree, em->start,
                                             extent_map_end(em) - 1,
-                                            EXTENT_LOCKED | EXTENT_WRITEBACK |
-                                            EXTENT_ORDERED,
-                                            0)) {
+                                            EXTENT_LOCKED | EXTENT_WRITEBACK,
+                                            0, NULL)) {
                                 remove_extent_mapping(map, em);
                                 /* once for the rb tree */
                                 free_extent_map(em);
                         }
                         start = extent_map_end(em);
-                        spin_unlock(&map->lock);
+                        write_unlock(&map->lock);
 
                         /* once for us */
                         free_extent_map(em);
@@ -3203,7 +3315,7 @@ int extent_range_uptodate(struct extent_io_tree *tree,
         int uptodate;
         unsigned long index;
 
-        ret = test_range_bit(tree, start, end, EXTENT_UPTODATE, 1);
+        ret = test_range_bit(tree, start, end, EXTENT_UPTODATE, 1, NULL);
         if (ret)
                 return 1;
         while (start <= end) {
@@ -3233,7 +3345,7 @@ int extent_buffer_uptodate(struct extent_io_tree *tree,
                 return 1;
 
         ret = test_range_bit(tree, eb->start, eb->start + eb->len - 1,
-                           EXTENT_UPTODATE, 1);
+                           EXTENT_UPTODATE, 1, NULL);
         if (ret)
                 return ret;
 
@@ -3269,7 +3381,7 @@ int read_extent_buffer_pages(struct extent_io_tree *tree,
                 return 0;
 
         if (test_range_bit(tree, eb->start, eb->start + eb->len - 1,
-                           EXTENT_UPTODATE, 1)) {
+                           EXTENT_UPTODATE, 1, NULL)) {
                 return 0;
         }
 
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 5bc20abf3f3d..4794ec891fed 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -13,10 +13,8 @@
 #define EXTENT_DEFRAG (1 << 6)
 #define EXTENT_DEFRAG_DONE (1 << 7)
 #define EXTENT_BUFFER_FILLED (1 << 8)
-#define EXTENT_ORDERED (1 << 9)
-#define EXTENT_ORDERED_METADATA (1 << 10)
-#define EXTENT_BOUNDARY (1 << 11)
-#define EXTENT_NODATASUM (1 << 12)
+#define EXTENT_BOUNDARY (1 << 9)
+#define EXTENT_NODATASUM (1 << 10)
 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
 
 /* flags for bio submission */
@@ -62,8 +60,13 @@ struct extent_io_ops {
                                       struct extent_state *state, int uptodate);
         int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
                             unsigned long old, unsigned long bits);
-        int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
-                            unsigned long old, unsigned long bits);
+        int (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
+                              unsigned long bits);
+        int (*merge_extent_hook)(struct inode *inode,
+                                 struct extent_state *new,
+                                 struct extent_state *other);
+        int (*split_extent_hook)(struct inode *inode,
+                                 struct extent_state *orig, u64 split);
         int (*write_cache_pages_lock_hook)(struct page *page);
 };
 
@@ -81,10 +84,14 @@ struct extent_state {
         u64 start;
         u64 end; /* inclusive */
         struct rb_node rb_node;
+
+        /* ADD NEW ELEMENTS AFTER THIS */
         struct extent_io_tree *tree;
         wait_queue_head_t wq;
         atomic_t refs;
         unsigned long state;
+        u64 split_start;
+        u64 split_end;
 
         /* for use by the FS */
         u64 private;
@@ -142,6 +149,8 @@ int try_release_extent_state(struct extent_map_tree *map,
                              struct extent_io_tree *tree, struct page *page,
                              gfp_t mask);
 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
+int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
+                     int bits, struct extent_state **cached, gfp_t mask);
 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
                     gfp_t mask);
@@ -155,11 +164,12 @@ u64 count_range_bits(struct extent_io_tree *tree,
                      u64 max_bytes, unsigned long bits);
 
 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
-                   int bits, int filled);
+                   int bits, int filled, struct extent_state *cached_state);
 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
                       int bits, gfp_t mask);
 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
-                     int bits, int wake, int delete, gfp_t mask);
+                     int bits, int wake, int delete, struct extent_state **cached,
+                     gfp_t mask);
 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
                     int bits, gfp_t mask);
 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
@@ -282,5 +292,6 @@ int extent_clear_unlock_delalloc(struct inode *inode,
                                 int clear_unlock,
                                 int clear_delalloc, int clear_dirty,
                                 int set_writeback,
-                                int end_writeback);
+                                int end_writeback,
+                                int set_private2);
 #endif
diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index 30c9365861e6..2c726b7b9faa 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -36,7 +36,7 @@ void extent_map_exit(void)
 void extent_map_tree_init(struct extent_map_tree *tree, gfp_t mask)
 {
         tree->map.rb_node = NULL;
-        spin_lock_init(&tree->lock);
+        rwlock_init(&tree->lock);
 }
 
 /**
@@ -198,6 +198,56 @@ static int mergable_maps(struct extent_map *prev, struct extent_map *next)
         return 0;
 }
 
+int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len)
+{
+        int ret = 0;
+        struct extent_map *merge = NULL;
+        struct rb_node *rb;
+        struct extent_map *em;
+
+        write_lock(&tree->lock);
+        em = lookup_extent_mapping(tree, start, len);
+
+        WARN_ON(em->start != start || !em);
+
+        if (!em)
+                goto out;
+
+        clear_bit(EXTENT_FLAG_PINNED, &em->flags);
+
+        if (em->start != 0) {
+                rb = rb_prev(&em->rb_node);
+                if (rb)
+                        merge = rb_entry(rb, struct extent_map, rb_node);
+                if (rb && mergable_maps(merge, em)) {
+                        em->start = merge->start;
+                        em->len += merge->len;
+                        em->block_len += merge->block_len;
+                        em->block_start = merge->block_start;
+                        merge->in_tree = 0;
+                        rb_erase(&merge->rb_node, &tree->map);
+                        free_extent_map(merge);
+                }
+        }
+
+        rb = rb_next(&em->rb_node);
+        if (rb)
+                merge = rb_entry(rb, struct extent_map, rb_node);
+        if (rb && mergable_maps(em, merge)) {
+                em->len += merge->len;
+                em->block_len += merge->len;
+                rb_erase(&merge->rb_node, &tree->map);
+                merge->in_tree = 0;
+                free_extent_map(merge);
+        }
+
+        free_extent_map(em);
+out:
+        write_unlock(&tree->lock);
+        return ret;
+
+}
+
 /**
  * add_extent_mapping - add new extent map to the extent tree
  * @tree:       tree to insert new map in
@@ -222,7 +272,6 @@ int add_extent_mapping(struct extent_map_tree *tree,
                 ret = -EEXIST;
                 goto out;
         }
-        assert_spin_locked(&tree->lock);
         rb = tree_insert(&tree->map, em->start, &em->rb_node);
         if (rb) {
                 ret = -EEXIST;
@@ -285,7 +334,6 @@ struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
         struct rb_node *next = NULL;
         u64 end = range_end(start, len);
 
-        assert_spin_locked(&tree->lock);
         rb_node = __tree_search(&tree->map, start, &prev, &next);
         if (!rb_node && prev) {
                 em = rb_entry(prev, struct extent_map, rb_node);
@@ -319,6 +367,54 @@ out:
 }
 
 /**
+ * search_extent_mapping - find a nearby extent map
+ * @tree:       tree to lookup in
+ * @start:      byte offset to start the search
+ * @len:        length of the lookup range
+ *
+ * Find and return the first extent_map struct in @tree that intersects the
+ * [start, len] range.
+ *
+ * If one can't be found, any nearby extent may be returned
+ */
+struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
+                                         u64 start, u64 len)
+{
+        struct extent_map *em;
+        struct rb_node *rb_node;
+        struct rb_node *prev = NULL;
+        struct rb_node *next = NULL;
+
+        rb_node = __tree_search(&tree->map, start, &prev, &next);
+        if (!rb_node && prev) {
+                em = rb_entry(prev, struct extent_map, rb_node);
+                goto found;
+        }
+        if (!rb_node && next) {
+                em = rb_entry(next, struct extent_map, rb_node);
+                goto found;
+        }
+        if (!rb_node) {
+                em = NULL;
+                goto out;
+        }
+        if (IS_ERR(rb_node)) {
+                em = ERR_PTR(PTR_ERR(rb_node));
+                goto out;
+        }
+        em = rb_entry(rb_node, struct extent_map, rb_node);
+        goto found;
+
+        em = NULL;
+        goto out;
+
+found:
+        atomic_inc(&em->refs);
+out:
+        return em;
+}
+
+/**
  * remove_extent_mapping - removes an extent_map from the extent tree
  * @tree:       extent tree to remove from
  * @em:         extent map beeing removed
@@ -331,7 +427,6 @@ int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em)
         int ret = 0;
 
         WARN_ON(test_bit(EXTENT_FLAG_PINNED, &em->flags));
-        assert_spin_locked(&tree->lock);
         rb_erase(&em->rb_node, &tree->map);
         em->in_tree = 0;
         return ret;
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index fb6eeef06bb0..ab6d74b6e647 100644
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -31,7 +31,7 @@ struct extent_map {
 
 struct extent_map_tree {
         struct rb_root map;
-        spinlock_t lock;
+        rwlock_t lock;
 };
 
 static inline u64 extent_map_end(struct extent_map *em)
@@ -59,4 +59,7 @@ struct extent_map *alloc_extent_map(gfp_t mask);
 void free_extent_map(struct extent_map *em);
 int __init extent_map_init(void);
 void extent_map_exit(void);
+int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len);
+struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
+                                         u64 start, u64 len);
 #endif
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 4b833972273a..f19e1259a971 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -112,8 +112,6 @@ static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans,
         int err = 0;
         int i;
         struct inode *inode = fdentry(file)->d_inode;
-        struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
-        u64 hint_byte;
         u64 num_bytes;
         u64 start_pos;
         u64 end_of_last_block;
@@ -125,23 +123,10 @@ static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans,
                     root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
 
         end_of_last_block = start_pos + num_bytes - 1;
+        err = btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block);
+        if (err)
+                return err;
 
-        lock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS);
-        trans = btrfs_join_transaction(root, 1);
-        if (!trans) {
-                err = -ENOMEM;
-                goto out_unlock;
-        }
-        btrfs_set_trans_block_group(trans, inode);
-        hint_byte = 0;
-
-        set_extent_uptodate(io_tree, start_pos, end_of_last_block, GFP_NOFS);
-
-        /* check for reserved extents on each page, we don't want
-         * to reset the delalloc bit on things that already have
-         * extents reserved.
-         */
-        btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block);
         for (i = 0; i < num_pages; i++) {
                 struct page *p = pages[i];
                 SetPageUptodate(p);
@@ -155,9 +140,6 @@ static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans,
                  * at this time.
                  */
         }
-        err = btrfs_end_transaction(trans, root);
-out_unlock:
-        unlock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS);
         return err;
 }
 
@@ -189,18 +171,18 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
                 if (!split2)
                         split2 = alloc_extent_map(GFP_NOFS);
 
-                spin_lock(&em_tree->lock);
+                write_lock(&em_tree->lock);
                 em = lookup_extent_mapping(em_tree, start, len);
                 if (!em) {
-                        spin_unlock(&em_tree->lock);
+                        write_unlock(&em_tree->lock);
                         break;
                 }
                 flags = em->flags;
                 if (skip_pinned && test_bit(EXTENT_FLAG_PINNED, &em->flags)) {
-                        spin_unlock(&em_tree->lock);
                         if (em->start <= start &&
                             (!testend || em->start + em->len >= start + len)) {
                                 free_extent_map(em);
+                                write_unlock(&em_tree->lock);
                                 break;
                         }
                         if (start < em->start) {
@@ -210,6 +192,7 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
                                 start = em->start + em->len;
                         }
                         free_extent_map(em);
+                        write_unlock(&em_tree->lock);
                         continue;
                 }
                 compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
@@ -260,7 +243,7 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
                         free_extent_map(split);
                         split = NULL;
                 }
-                spin_unlock(&em_tree->lock);
+                write_unlock(&em_tree->lock);
 
                 /* once for us */
                 free_extent_map(em);
@@ -289,7 +272,7 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
 noinline int btrfs_drop_extents(struct btrfs_trans_handle *trans,
                        struct btrfs_root *root, struct inode *inode,
                        u64 start, u64 end, u64 locked_end,
-                       u64 inline_limit, u64 *hint_byte)
+                       u64 inline_limit, u64 *hint_byte, int drop_cache)
 {
         u64 extent_end = 0;
         u64 search_start = start;
@@ -314,7 +297,8 @@ noinline int btrfs_drop_extents(struct btrfs_trans_handle *trans,
         int ret;
 
         inline_limit = 0;
-        btrfs_drop_extent_cache(inode, start, end - 1, 0);
+        if (drop_cache)
+                btrfs_drop_extent_cache(inode, start, end - 1, 0);
 
         path = btrfs_alloc_path();
         if (!path)
@@ -936,21 +920,35 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
         start_pos = pos;
 
         vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
+
+        /* do the reserve before the mutex lock in case we have to do some
+         * flushing.  We wouldn't deadlock, but this is more polite.
+         */
+        err = btrfs_reserve_metadata_for_delalloc(root, inode, 1);
+        if (err)
+                goto out_nolock;
+
+        mutex_lock(&inode->i_mutex);
+
         current->backing_dev_info = inode->i_mapping->backing_dev_info;
         err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
         if (err)
-                goto out_nolock;
+                goto out;
+
         if (count == 0)
-                goto out_nolock;
+                goto out;
 
         err = file_remove_suid(file);
         if (err)
-                goto out_nolock;
+                goto out;
+
         file_update_time(file);
 
         pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL);
 
-        mutex_lock(&inode->i_mutex);
+        /* generic_write_checks can change our pos */
+        start_pos = pos;
+
         BTRFS_I(inode)->sequence++;
         first_index = pos >> PAGE_CACHE_SHIFT;
         last_index = (pos + count) >> PAGE_CACHE_SHIFT;
@@ -1024,9 +1022,8 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
                 }
 
                 if (will_write) {
-                        btrfs_fdatawrite_range(inode->i_mapping, pos,
-                                               pos + write_bytes - 1,
-                                               WB_SYNC_ALL);
+                        filemap_fdatawrite_range(inode->i_mapping, pos,
+                                                 pos + write_bytes - 1);
                 } else {
                         balance_dirty_pages_ratelimited_nr(inode->i_mapping,
                                                            num_pages);
@@ -1047,6 +1044,7 @@ out:
         mutex_unlock(&inode->i_mutex);
         if (ret)
                 err = ret;
+        btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
 
 out_nolock:
         kfree(pages);
@@ -1203,7 +1201,7 @@ out:
         return ret > 0 ? EIO : ret;
 }
 
-static struct vm_operations_struct btrfs_file_vm_ops = {
+static const struct vm_operations_struct btrfs_file_vm_ops = {
         .fault          = filemap_fault,
         .page_mkwrite   = btrfs_page_mkwrite,
 };
@@ -1215,7 +1213,7 @@ static int btrfs_file_mmap(struct file	*filp, struct vm_area_struct *vma)
         return 0;
 }
 
-struct file_operations btrfs_file_operations = {
+const struct file_operations btrfs_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = do_sync_read,
         .aio_read       = generic_file_aio_read,
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 5edcee3a617f..5c2caad76212 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -259,7 +259,9 @@ static int link_free_space(struct btrfs_block_group_cache *block_group,
 
 static void recalculate_thresholds(struct btrfs_block_group_cache *block_group)
 {
-        u64 max_bytes, possible_bytes;
+        u64 max_bytes;
+        u64 bitmap_bytes;
+        u64 extent_bytes;
 
         /*
          * The goal is to keep the total amount of memory used per 1gb of space
@@ -269,22 +271,27 @@ static void recalculate_thresholds(struct btrfs_block_group_cache *block_group)
         max_bytes = MAX_CACHE_BYTES_PER_GIG *
                 (div64_u64(block_group->key.offset, 1024 * 1024 * 1024));
 
-        possible_bytes = (block_group->total_bitmaps * PAGE_CACHE_SIZE) +
-                (sizeof(struct btrfs_free_space) *
-                 block_group->extents_thresh);
+        /*
+         * we want to account for 1 more bitmap than what we have so we can make
+         * sure we don't go over our overall goal of MAX_CACHE_BYTES_PER_GIG as
+         * we add more bitmaps.
+         */
+        bitmap_bytes = (block_group->total_bitmaps + 1) * PAGE_CACHE_SIZE;
 
-        if (possible_bytes > max_bytes) {
-                int extent_bytes = max_bytes -
-                        (block_group->total_bitmaps * PAGE_CACHE_SIZE);
+        if (bitmap_bytes >= max_bytes) {
+                block_group->extents_thresh = 0;
+                return;
+        }
 
-                if (extent_bytes <= 0) {
-                        block_group->extents_thresh = 0;
-                        return;
-                }
+        /*
+         * we want the extent entry threshold to always be at most 1/2 the maxw
+         * bytes we can have, or whatever is less than that.
+         */
+        extent_bytes = max_bytes - bitmap_bytes;
+        extent_bytes = min_t(u64, extent_bytes, div64_u64(max_bytes, 2));
 
-                block_group->extents_thresh = extent_bytes /
-                        (sizeof(struct btrfs_free_space));
-        }
+        block_group->extents_thresh =
+                div64_u64(extent_bytes, (sizeof(struct btrfs_free_space)));
 }
 
 static void bitmap_clear_bits(struct btrfs_block_group_cache *block_group,
@@ -403,6 +410,7 @@ static void add_new_bitmap(struct btrfs_block_group_cache *block_group,
         BUG_ON(block_group->total_bitmaps >= max_bitmaps);
 
         info->offset = offset_to_bitmap(block_group, offset);
+        info->bytes = 0;
         link_free_space(block_group, info);
         block_group->total_bitmaps++;
 
diff --git a/fs/btrfs/inode-item.c b/fs/btrfs/inode-item.c
index 6b627c611808..72ce3c173d6a 100644
--- a/fs/btrfs/inode-item.c
+++ b/fs/btrfs/inode-item.c
@@ -149,6 +149,8 @@ int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
                 ptr = (unsigned long)(ref + 1);
                 ret = 0;
         } else if (ret < 0) {
+                if (ret == -EOVERFLOW)
+                        ret = -EMLINK;
                 goto out;
         } else {
                 ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
@@ -177,8 +179,6 @@ int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
 
         ret = btrfs_insert_empty_item(trans, root, path, &key,
                                       sizeof(struct btrfs_inode_item));
-        if (ret == 0 && objectid > root->highest_inode)
-                root->highest_inode = objectid;
         return ret;
 }
 
diff --git a/fs/btrfs/inode-map.c b/fs/btrfs/inode-map.c
index 9abbced1123d..c56eb5909172 100644
--- a/fs/btrfs/inode-map.c
+++ b/fs/btrfs/inode-map.c
@@ -43,9 +43,10 @@ int btrfs_find_highest_inode(struct btrfs_root *root, u64 *objectid)
                 slot = path->slots[0] - 1;
                 l = path->nodes[0];
                 btrfs_item_key_to_cpu(l, &found_key, slot);
-                *objectid = found_key.objectid;
+                *objectid = max_t(u64, found_key.objectid,
+                                  BTRFS_FIRST_FREE_OBJECTID - 1);
         } else {
-                *objectid = BTRFS_FIRST_FREE_OBJECTID;
+                *objectid = BTRFS_FIRST_FREE_OBJECTID - 1;
         }
         ret = 0;
 error:
@@ -53,91 +54,27 @@ error:
         return ret;
 }
 
-/*
- * walks the btree of allocated inodes and find a hole.
- */
 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
                              struct btrfs_root *root,
                              u64 dirid, u64 *objectid)
 {
-        struct btrfs_path *path;
-        struct btrfs_key key;
         int ret;
-        int slot = 0;
-        u64 last_ino = 0;
-        int start_found;
-        struct extent_buffer *l;
-        struct btrfs_key search_key;
-        u64 search_start = dirid;
-
         mutex_lock(&root->objectid_mutex);
-        if (root->last_inode_alloc >= BTRFS_FIRST_FREE_OBJECTID &&
-            root->last_inode_alloc < BTRFS_LAST_FREE_OBJECTID) {
-                *objectid = ++root->last_inode_alloc;
-                mutex_unlock(&root->objectid_mutex);
-                return 0;
-        }
-        path = btrfs_alloc_path();
-        BUG_ON(!path);
-        search_start = max(search_start, (u64)BTRFS_FIRST_FREE_OBJECTID);
-        search_key.objectid = search_start;
-        search_key.type = 0;
-        search_key.offset = 0;
-
-        start_found = 0;
-        ret = btrfs_search_slot(trans, root, &search_key, path, 0, 0);
-        if (ret < 0)
-                goto error;
 
-        while (1) {
-                l = path->nodes[0];
-                slot = path->slots[0];
-                if (slot >= btrfs_header_nritems(l)) {
-                        ret = btrfs_next_leaf(root, path);
-                        if (ret == 0)
-                                continue;
-                        if (ret < 0)
-                                goto error;
-                        if (!start_found) {
-                                *objectid = search_start;
-                                start_found = 1;
-                                goto found;
-                        }
-                        *objectid = last_ino > search_start ?
-                                last_ino : search_start;
-                        goto found;
-                }
-                btrfs_item_key_to_cpu(l, &key, slot);
-                if (key.objectid >= search_start) {
-                        if (start_found) {
-                                if (last_ino < search_start)
-                                        last_ino = search_start;
-                                if (key.objectid > last_ino) {
-                                        *objectid = last_ino;
-                                        goto found;
-                                }
-                        } else if (key.objectid > search_start) {
-                                *objectid = search_start;
-                                goto found;
-                        }
-                }
-                if (key.objectid >= BTRFS_LAST_FREE_OBJECTID)
-                        break;
+        if (unlikely(root->highest_objectid < BTRFS_FIRST_FREE_OBJECTID)) {
+                ret = btrfs_find_highest_inode(root, &root->highest_objectid);
+                if (ret)
+                        goto out;
+        }
 
-                start_found = 1;
-                last_ino = key.objectid + 1;
-                path->slots[0]++;
+        if (unlikely(root->highest_objectid >= BTRFS_LAST_FREE_OBJECTID)) {
+                ret = -ENOSPC;
+                goto out;
         }
-        BUG_ON(1);
-found:
-        btrfs_release_path(root, path);
-        btrfs_free_path(path);
-        BUG_ON(*objectid < search_start);
-        mutex_unlock(&root->objectid_mutex);
-        return 0;
-error:
-        btrfs_release_path(root, path);
-        btrfs_free_path(path);
+
+        *objectid = ++root->highest_objectid;
+        ret = 0;
+out:
         mutex_unlock(&root->objectid_mutex);
         return ret;
 }
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 59cba180fe83..112e5aa85892 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -55,14 +55,14 @@ struct btrfs_iget_args {
         struct btrfs_root *root;
 };
 
-static struct inode_operations btrfs_dir_inode_operations;
-static struct inode_operations btrfs_symlink_inode_operations;
-static struct inode_operations btrfs_dir_ro_inode_operations;
-static struct inode_operations btrfs_special_inode_operations;
-static struct inode_operations btrfs_file_inode_operations;
-static struct address_space_operations btrfs_aops;
-static struct address_space_operations btrfs_symlink_aops;
-static struct file_operations btrfs_dir_file_operations;
+static const struct inode_operations btrfs_dir_inode_operations;
+static const struct inode_operations btrfs_symlink_inode_operations;
+static const struct inode_operations btrfs_dir_ro_inode_operations;
+static const struct inode_operations btrfs_special_inode_operations;
+static const struct inode_operations btrfs_file_inode_operations;
+static const struct address_space_operations btrfs_aops;
+static const struct address_space_operations btrfs_symlink_aops;
+static const struct file_operations btrfs_dir_file_operations;
 static struct extent_io_ops btrfs_extent_io_ops;
 
 static struct kmem_cache *btrfs_inode_cachep;
@@ -231,7 +231,8 @@ static noinline int cow_file_range_inline(struct btrfs_trans_handle *trans,
         }
 
         ret = btrfs_drop_extents(trans, root, inode, start,
-                                 aligned_end, aligned_end, start, &hint_byte);
+                                 aligned_end, aligned_end, start,
+                                 &hint_byte, 1);
         BUG_ON(ret);
 
         if (isize > actual_end)
@@ -240,7 +241,7 @@ static noinline int cow_file_range_inline(struct btrfs_trans_handle *trans,
                                    inline_len, compressed_size,
                                    compressed_pages);
         BUG_ON(ret);
-        btrfs_drop_extent_cache(inode, start, aligned_end, 0);
+        btrfs_drop_extent_cache(inode, start, aligned_end - 1, 0);
         return 0;
 }
 
@@ -425,7 +426,7 @@ again:
                         extent_clear_unlock_delalloc(inode,
                                                      &BTRFS_I(inode)->io_tree,
                                                      start, end, NULL, 1, 0,
-                                                     0, 1, 1, 1);
+                                                     0, 1, 1, 1, 0);
                         ret = 0;
                         goto free_pages_out;
                 }
@@ -611,9 +612,9 @@ static noinline int submit_compressed_extents(struct inode *inode,
                 set_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
 
                 while (1) {
-                        spin_lock(&em_tree->lock);
+                        write_lock(&em_tree->lock);
                         ret = add_extent_mapping(em_tree, em);
-                        spin_unlock(&em_tree->lock);
+                        write_unlock(&em_tree->lock);
                         if (ret != -EEXIST) {
                                 free_extent_map(em);
                                 break;
@@ -640,7 +641,7 @@ static noinline int submit_compressed_extents(struct inode *inode,
                                              async_extent->start,
                                              async_extent->start +
                                              async_extent->ram_size - 1,
-                                             NULL, 1, 1, 0, 1, 1, 0);
+                                             NULL, 1, 1, 0, 1, 1, 0, 0);
 
                 ret = btrfs_submit_compressed_write(inode,
                                     async_extent->start,
@@ -713,7 +714,7 @@ static noinline int cow_file_range(struct inode *inode,
                         extent_clear_unlock_delalloc(inode,
                                                      &BTRFS_I(inode)->io_tree,
                                                      start, end, NULL, 1, 1,
-                                                     1, 1, 1, 1);
+                                                     1, 1, 1, 1, 0);
                         *nr_written = *nr_written +
                              (end - start + PAGE_CACHE_SIZE) / PAGE_CACHE_SIZE;
                         *page_started = 1;
@@ -725,6 +726,15 @@ static noinline int cow_file_range(struct inode *inode,
         BUG_ON(disk_num_bytes >
                btrfs_super_total_bytes(&root->fs_info->super_copy));
 
+
+        read_lock(&BTRFS_I(inode)->extent_tree.lock);
+        em = search_extent_mapping(&BTRFS_I(inode)->extent_tree,
+                                   start, num_bytes);
+        if (em) {
+                alloc_hint = em->block_start;
+                free_extent_map(em);
+        }
+        read_unlock(&BTRFS_I(inode)->extent_tree.lock);
         btrfs_drop_extent_cache(inode, start, start + num_bytes - 1, 0);
 
         while (disk_num_bytes > 0) {
@@ -737,7 +747,6 @@ static noinline int cow_file_range(struct inode *inode,
                 em = alloc_extent_map(GFP_NOFS);
                 em->start = start;
                 em->orig_start = em->start;
-
                 ram_size = ins.offset;
                 em->len = ins.offset;
 
@@ -747,9 +756,9 @@ static noinline int cow_file_range(struct inode *inode,
                 set_bit(EXTENT_FLAG_PINNED, &em->flags);
 
                 while (1) {
-                        spin_lock(&em_tree->lock);
+                        write_lock(&em_tree->lock);
                         ret = add_extent_mapping(em_tree, em);
-                        spin_unlock(&em_tree->lock);
+                        write_unlock(&em_tree->lock);
                         if (ret != -EEXIST) {
                                 free_extent_map(em);
                                 break;
@@ -776,11 +785,14 @@ static noinline int cow_file_range(struct inode *inode,
                 /* we're not doing compressed IO, don't unlock the first
                  * page (which the caller expects to stay locked), don't
                  * clear any dirty bits and don't set any writeback bits
+                 *
+                 * Do set the Private2 bit so we know this page was properly
+                 * setup for writepage
                  */
                 extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree,
                                              start, start + ram_size - 1,
                                              locked_page, unlock, 1,
-                                             1, 0, 0, 0);
+                                             1, 0, 0, 0, 1);
                 disk_num_bytes -= cur_alloc_size;
                 num_bytes -= cur_alloc_size;
                 alloc_hint = ins.objectid + ins.offset;
@@ -853,7 +865,7 @@ static int cow_file_range_async(struct inode *inode, struct page *locked_page,
         int limit = 10 * 1024 * 1042;
 
         clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, EXTENT_LOCKED |
-                         EXTENT_DELALLOC, 1, 0, GFP_NOFS);
+                         EXTENT_DELALLOC, 1, 0, NULL, GFP_NOFS);
         while (start < end) {
                 async_cow = kmalloc(sizeof(*async_cow), GFP_NOFS);
                 async_cow->inode = inode;
@@ -1080,9 +1092,9 @@ out_check:
                         em->bdev = root->fs_info->fs_devices->latest_bdev;
                         set_bit(EXTENT_FLAG_PINNED, &em->flags);
                         while (1) {
-                                spin_lock(&em_tree->lock);
+                                write_lock(&em_tree->lock);
                                 ret = add_extent_mapping(em_tree, em);
-                                spin_unlock(&em_tree->lock);
+                                write_unlock(&em_tree->lock);
                                 if (ret != -EEXIST) {
                                         free_extent_map(em);
                                         break;
@@ -1101,7 +1113,7 @@ out_check:
 
                 extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree,
                                         cur_offset, cur_offset + num_bytes - 1,
-                                        locked_page, 1, 1, 1, 0, 0, 0);
+                                        locked_page, 1, 1, 1, 0, 0, 0, 1);
                 cur_offset = extent_end;
                 if (cur_offset > end)
                         break;
@@ -1147,6 +1159,83 @@ static int run_delalloc_range(struct inode *inode, struct page *locked_page,
         return ret;
 }
 
+static int btrfs_split_extent_hook(struct inode *inode,
+                                    struct extent_state *orig, u64 split)
+{
+        struct btrfs_root *root = BTRFS_I(inode)->root;
+        u64 size;
+
+        if (!(orig->state & EXTENT_DELALLOC))
+                return 0;
+
+        size = orig->end - orig->start + 1;
+        if (size > root->fs_info->max_extent) {
+                u64 num_extents;
+                u64 new_size;
+
+                new_size = orig->end - split + 1;
+                num_extents = div64_u64(size + root->fs_info->max_extent - 1,
+                                        root->fs_info->max_extent);
+
+                /*
+                 * if we break a large extent up then leave delalloc_extents be,
+                 * since we've already accounted for the large extent.
+                 */
+                if (div64_u64(new_size + root->fs_info->max_extent - 1,
+                              root->fs_info->max_extent) < num_extents)
+                        return 0;
+        }
+
+        BTRFS_I(inode)->delalloc_extents++;
+
+        return 0;
+}
+
+/*
+ * extent_io.c merge_extent_hook, used to track merged delayed allocation
+ * extents so we can keep track of new extents that are just merged onto old
+ * extents, such as when we are doing sequential writes, so we can properly
+ * account for the metadata space we'll need.
+ */
+static int btrfs_merge_extent_hook(struct inode *inode,
+                                   struct extent_state *new,
+                                   struct extent_state *other)
+{
+        struct btrfs_root *root = BTRFS_I(inode)->root;
+        u64 new_size, old_size;
+        u64 num_extents;
+
+        /* not delalloc, ignore it */
+        if (!(other->state & EXTENT_DELALLOC))
+                return 0;
+
+        old_size = other->end - other->start + 1;
+        if (new->start < other->start)
+                new_size = other->end - new->start + 1;
+        else
+                new_size = new->end - other->start + 1;
+
+        /* we're not bigger than the max, unreserve the space and go */
+        if (new_size <= root->fs_info->max_extent) {
+                BTRFS_I(inode)->delalloc_extents--;
+                return 0;
+        }
+
+        /*
+         * If we grew by another max_extent, just return, we want to keep that
+         * reserved amount.
+         */
+        num_extents = div64_u64(old_size + root->fs_info->max_extent - 1,
+                                root->fs_info->max_extent);
+        if (div64_u64(new_size + root->fs_info->max_extent - 1,
+                      root->fs_info->max_extent) > num_extents)
+                return 0;
+
+        BTRFS_I(inode)->delalloc_extents--;
+
+        return 0;
+}
+
 /*
  * extent_io.c set_bit_hook, used to track delayed allocation
  * bytes in this file, and to maintain the list of inodes that
@@ -1155,6 +1244,7 @@ static int run_delalloc_range(struct inode *inode, struct page *locked_page,
 static int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
                        unsigned long old, unsigned long bits)
 {
+
         /*
          * set_bit and clear bit hooks normally require _irqsave/restore
          * but in this case, we are only testeing for the DELALLOC
@@ -1162,6 +1252,8 @@ static int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
          */
         if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
                 struct btrfs_root *root = BTRFS_I(inode)->root;
+
+                BTRFS_I(inode)->delalloc_extents++;
                 btrfs_delalloc_reserve_space(root, inode, end - start + 1);
                 spin_lock(&root->fs_info->delalloc_lock);
                 BTRFS_I(inode)->delalloc_bytes += end - start + 1;
@@ -1178,22 +1270,27 @@ static int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
 /*
  * extent_io.c clear_bit_hook, see set_bit_hook for why
  */
-static int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
-                         unsigned long old, unsigned long bits)
+static int btrfs_clear_bit_hook(struct inode *inode,
+                                struct extent_state *state, unsigned long bits)
 {
         /*
          * set_bit and clear bit hooks normally require _irqsave/restore
          * but in this case, we are only testeing for the DELALLOC
          * bit, which is only set or cleared with irqs on
          */
-        if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
+        if ((state->state & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
                 struct btrfs_root *root = BTRFS_I(inode)->root;
 
+                BTRFS_I(inode)->delalloc_extents--;
+                btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
+
                 spin_lock(&root->fs_info->delalloc_lock);
-                if (end - start + 1 > root->fs_info->delalloc_bytes) {
+                if (state->end - state->start + 1 >
+                    root->fs_info->delalloc_bytes) {
                         printk(KERN_INFO "btrfs warning: delalloc account "
                                "%llu %llu\n",
-                               (unsigned long long)end - start + 1,
+                               (unsigned long long)
+                               state->end - state->start + 1,
                                (unsigned long long)
                                root->fs_info->delalloc_bytes);
                         btrfs_delalloc_free_space(root, inode, (u64)-1);
@@ -1201,9 +1298,12 @@ static int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
                         BTRFS_I(inode)->delalloc_bytes = 0;
                 } else {
                         btrfs_delalloc_free_space(root, inode,
-                                                  end - start + 1);
-                        root->fs_info->delalloc_bytes -= end - start + 1;
-                        BTRFS_I(inode)->delalloc_bytes -= end - start + 1;
+                                                  state->end -
+                                                  state->start + 1);
+                        root->fs_info->delalloc_bytes -= state->end -
+                                state->start + 1;
+                        BTRFS_I(inode)->delalloc_bytes -= state->end -
+                                state->start + 1;
                 }
                 if (BTRFS_I(inode)->delalloc_bytes == 0 &&
                     !list_empty(&BTRFS_I(inode)->delalloc_inodes)) {
@@ -1374,10 +1474,8 @@ again:
         lock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end, GFP_NOFS);
 
         /* already ordered? We're done */
-        if (test_range_bit(&BTRFS_I(inode)->io_tree, page_start, page_end,
-                             EXTENT_ORDERED, 0)) {
+        if (PagePrivate2(page))
                 goto out;
-        }
 
         ordered = btrfs_lookup_ordered_extent(inode, page_start);
         if (ordered) {
@@ -1413,11 +1511,9 @@ static int btrfs_writepage_start_hook(struct page *page, u64 start, u64 end)
         struct inode *inode = page->mapping->host;
         struct btrfs_writepage_fixup *fixup;
         struct btrfs_root *root = BTRFS_I(inode)->root;
-        int ret;
 
-        ret = test_range_bit(&BTRFS_I(inode)->io_tree, start, end,
-                             EXTENT_ORDERED, 0);
-        if (ret)
+        /* this page is properly in the ordered list */
+        if (TestClearPagePrivate2(page))
                 return 0;
 
         if (PageChecked(page))
@@ -1455,9 +1551,19 @@ static int insert_reserved_file_extent(struct btrfs_trans_handle *trans,
         BUG_ON(!path);
 
         path->leave_spinning = 1;
+
+        /*
+         * we may be replacing one extent in the tree with another.
+         * The new extent is pinned in the extent map, and we don't want
+         * to drop it from the cache until it is completely in the btree.
+         *
+         * So, tell btrfs_drop_extents to leave this extent in the cache.
+         * the caller is expected to unpin it and allow it to be merged
+         * with the others.
+         */
         ret = btrfs_drop_extents(trans, root, inode, file_pos,
                                  file_pos + num_bytes, locked_end,
-                                 file_pos, &hint);
+                                 file_pos, &hint, 0);
         BUG_ON(ret);
 
         ins.objectid = inode->i_ino;
@@ -1485,7 +1591,6 @@ static int insert_reserved_file_extent(struct btrfs_trans_handle *trans,
         btrfs_mark_buffer_dirty(leaf);
 
         inode_add_bytes(inode, num_bytes);
-        btrfs_drop_extent_cache(inode, file_pos, file_pos + num_bytes - 1, 0);
 
         ins.objectid = disk_bytenr;
         ins.offset = disk_num_bytes;
@@ -1596,6 +1701,9 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end)
                                                 ordered_extent->len,
                                                 compressed, 0, 0,
                                                 BTRFS_FILE_EXTENT_REG);
+                unpin_extent_cache(&BTRFS_I(inode)->extent_tree,
+                                   ordered_extent->file_offset,
+                                   ordered_extent->len);
                 BUG_ON(ret);
         }
         unlock_extent(io_tree, ordered_extent->file_offset,
@@ -1623,6 +1731,7 @@ nocow:
 static int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end,
                                 struct extent_state *state, int uptodate)
 {
+        ClearPagePrivate2(page);
         return btrfs_finish_ordered_io(page->mapping->host, start, end);
 }
 
@@ -1669,13 +1778,13 @@ static int btrfs_io_failed_hook(struct bio *failed_bio,
                 failrec->last_mirror = 0;
                 failrec->bio_flags = 0;
 
-                spin_lock(&em_tree->lock);
+                read_lock(&em_tree->lock);
                 em = lookup_extent_mapping(em_tree, start, failrec->len);
                 if (em->start > start || em->start + em->len < start) {
                         free_extent_map(em);
                         em = NULL;
                 }
-                spin_unlock(&em_tree->lock);
+                read_unlock(&em_tree->lock);
 
                 if (!em || IS_ERR(em)) {
                         kfree(failrec);
@@ -1794,7 +1903,7 @@ static int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
                 return 0;
 
         if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID &&
-            test_range_bit(io_tree, start, end, EXTENT_NODATASUM, 1)) {
+            test_range_bit(io_tree, start, end, EXTENT_NODATASUM, 1, NULL)) {
                 clear_extent_bits(io_tree, start, end, EXTENT_NODATASUM,
                                   GFP_NOFS);
                 return 0;
@@ -2352,6 +2461,69 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
         return ret;
 }
 
+int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
+                        struct btrfs_root *root,
+                        struct inode *dir, u64 objectid,
+                        const char *name, int name_len)
+{
+        struct btrfs_path *path;
+        struct extent_buffer *leaf;
+        struct btrfs_dir_item *di;
+        struct btrfs_key key;
+        u64 index;
+        int ret;
+
+        path = btrfs_alloc_path();
+        if (!path)
+                return -ENOMEM;
+
+        di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
+                                   name, name_len, -1);
+        BUG_ON(!di || IS_ERR(di));
+
+        leaf = path->nodes[0];
+        btrfs_dir_item_key_to_cpu(leaf, di, &key);
+        WARN_ON(key.type != BTRFS_ROOT_ITEM_KEY || key.objectid != objectid);
+        ret = btrfs_delete_one_dir_name(trans, root, path, di);
+        BUG_ON(ret);
+        btrfs_release_path(root, path);
+
+        ret = btrfs_del_root_ref(trans, root->fs_info->tree_root,
+                                 objectid, root->root_key.objectid,
+                                 dir->i_ino, &index, name, name_len);
+        if (ret < 0) {
+                BUG_ON(ret != -ENOENT);
+                di = btrfs_search_dir_index_item(root, path, dir->i_ino,
+                                                 name, name_len);
+                BUG_ON(!di || IS_ERR(di));
+
+                leaf = path->nodes[0];
+                btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
+                btrfs_release_path(root, path);
+                index = key.offset;
+        }
+
+        di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
+                                         index, name, name_len, -1);
+        BUG_ON(!di || IS_ERR(di));
+
+        leaf = path->nodes[0];
+        btrfs_dir_item_key_to_cpu(leaf, di, &key);
+        WARN_ON(key.type != BTRFS_ROOT_ITEM_KEY || key.objectid != objectid);
+        ret = btrfs_delete_one_dir_name(trans, root, path, di);
+        BUG_ON(ret);
+        btrfs_release_path(root, path);
+
+        btrfs_i_size_write(dir, dir->i_size - name_len * 2);
+        dir->i_mtime = dir->i_ctime = CURRENT_TIME;
+        ret = btrfs_update_inode(trans, root, dir);
+        BUG_ON(ret);
+        dir->i_sb->s_dirt = 1;
+
+        btrfs_free_path(path);
+        return 0;
+}
+
 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
 {
         struct inode *inode = dentry->d_inode;
@@ -2361,29 +2533,31 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
         struct btrfs_trans_handle *trans;
         unsigned long nr = 0;
 
-        /*
-         * the FIRST_FREE_OBJECTID check makes sure we don't try to rmdir
-         * the root of a subvolume or snapshot
-         */
         if (inode->i_size > BTRFS_EMPTY_DIR_SIZE ||
-            inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) {
+            inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
                 return -ENOTEMPTY;
-        }
 
         trans = btrfs_start_transaction(root, 1);
         btrfs_set_trans_block_group(trans, dir);
 
+        if (unlikely(inode->i_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) {
+                err = btrfs_unlink_subvol(trans, root, dir,
+                                          BTRFS_I(inode)->location.objectid,
+                                          dentry->d_name.name,
+                                          dentry->d_name.len);
+                goto out;
+        }
+
         err = btrfs_orphan_add(trans, inode);
         if (err)
-                goto fail_trans;
+                goto out;
 
         /* now the directory is empty */
         err = btrfs_unlink_inode(trans, root, dir, dentry->d_inode,
                                  dentry->d_name.name, dentry->d_name.len);
         if (!err)
                 btrfs_i_size_write(inode, 0);
-
-fail_trans:
+out:
         nr = trans->blocks_used;
         ret = btrfs_end_transaction_throttle(trans, root);
         btrfs_btree_balance_dirty(root, nr);
@@ -2864,7 +3038,12 @@ again:
                 goto again;
         }
 
-        btrfs_set_extent_delalloc(inode, page_start, page_end);
+        ret = btrfs_set_extent_delalloc(inode, page_start, page_end);
+        if (ret) {
+                unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
+                goto out_unlock;
+        }
+
         ret = 0;
         if (offset != PAGE_CACHE_SIZE) {
                 kaddr = kmap(page);
@@ -2895,15 +3074,11 @@ int btrfs_cont_expand(struct inode *inode, loff_t size)
         u64 last_byte;
         u64 cur_offset;
         u64 hole_size;
-        int err;
+        int err = 0;
 
         if (size <= hole_start)
                 return 0;
 
-        err = btrfs_check_metadata_free_space(root);
-        if (err)
-                return err;
-
         btrfs_truncate_page(inode->i_mapping, inode->i_size);
 
         while (1) {
@@ -2935,15 +3110,21 @@ int btrfs_cont_expand(struct inode *inode, loff_t size)
                                                  cur_offset,
                                                  cur_offset + hole_size,
                                                  block_end,
-                                                 cur_offset, &hint_byte);
+                                                 cur_offset, &hint_byte, 1);
                         if (err)
                                 break;
+
+                        err = btrfs_reserve_metadata_space(root, 1);
+                        if (err)
+                                break;
+
                         err = btrfs_insert_file_extent(trans, root,
                                         inode->i_ino, cur_offset, 0,
                                         0, hole_size, 0, hole_size,
                                         0, 0, 0);
                         btrfs_drop_extent_cache(inode, hole_start,
                                         last_byte - 1, 0);
+                        btrfs_unreserve_metadata_space(root, 1);
                 }
                 free_extent_map(em);
                 cur_offset = last_byte;
@@ -3003,6 +3184,11 @@ void btrfs_delete_inode(struct inode *inode)
         }
         btrfs_wait_ordered_range(inode, 0, (u64)-1);
 
+        if (inode->i_nlink > 0) {
+                BUG_ON(btrfs_root_refs(&root->root_item) != 0);
+                goto no_delete;
+        }
+
         btrfs_i_size_write(inode, 0);
         trans = btrfs_join_transaction(root, 1);
 
@@ -3070,29 +3256,67 @@ out_err:
  * is kind of like crossing a mount point.
  */
 static int fixup_tree_root_location(struct btrfs_root *root,
-                             struct btrfs_key *location,
-                             struct btrfs_root **sub_root,
-                             struct dentry *dentry)
+                                    struct inode *dir,
+                                    struct dentry *dentry,
+                                    struct btrfs_key *location,
+                                    struct btrfs_root **sub_root)
 {
-        struct btrfs_root_item *ri;
+        struct btrfs_path *path;
+        struct btrfs_root *new_root;
+        struct btrfs_root_ref *ref;
+        struct extent_buffer *leaf;
+        int ret;
+        int err = 0;
 
-        if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
-                return 0;
-        if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
-                return 0;
+        path = btrfs_alloc_path();
+        if (!path) {
+                err = -ENOMEM;
+                goto out;
+        }
 
-        *sub_root = btrfs_read_fs_root(root->fs_info, location,
-                                        dentry->d_name.name,
-                                        dentry->d_name.len);
-        if (IS_ERR(*sub_root))
-                return PTR_ERR(*sub_root);
+        err = -ENOENT;
+        ret = btrfs_find_root_ref(root->fs_info->tree_root, path,
+                                  BTRFS_I(dir)->root->root_key.objectid,
+                                  location->objectid);
+        if (ret) {
+                if (ret < 0)
+                        err = ret;
+                goto out;
+        }
 
-        ri = &(*sub_root)->root_item;
-        location->objectid = btrfs_root_dirid(ri);
-        btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
-        location->offset = 0;
+        leaf = path->nodes[0];
+        ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref);
+        if (btrfs_root_ref_dirid(leaf, ref) != dir->i_ino ||
+            btrfs_root_ref_name_len(leaf, ref) != dentry->d_name.len)
+                goto out;
 
-        return 0;
+        ret = memcmp_extent_buffer(leaf, dentry->d_name.name,
+                                   (unsigned long)(ref + 1),
+                                   dentry->d_name.len);
+        if (ret)
+                goto out;
+
+        btrfs_release_path(root->fs_info->tree_root, path);
+
+        new_root = btrfs_read_fs_root_no_name(root->fs_info, location);
+        if (IS_ERR(new_root)) {
+                err = PTR_ERR(new_root);
+                goto out;
+        }
+
+        if (btrfs_root_refs(&new_root->root_item) == 0) {
+                err = -ENOENT;
+                goto out;
+        }
+
+        *sub_root = new_root;
+        location->objectid = btrfs_root_dirid(&new_root->root_item);
+        location->type = BTRFS_INODE_ITEM_KEY;
+        location->offset = 0;
+        err = 0;
+out:
+        btrfs_free_path(path);
+        return err;
 }
 
 static void inode_tree_add(struct inode *inode)
@@ -3101,11 +3325,13 @@ static void inode_tree_add(struct inode *inode)
         struct btrfs_inode *entry;
         struct rb_node **p;
         struct rb_node *parent;
-
 again:
         p = &root->inode_tree.rb_node;
         parent = NULL;
 
+        if (hlist_unhashed(&inode->i_hash))
+                return;
+
         spin_lock(&root->inode_lock);
         while (*p) {
                 parent = *p;
@@ -3132,13 +3358,87 @@ again:
 static void inode_tree_del(struct inode *inode)
 {
         struct btrfs_root *root = BTRFS_I(inode)->root;
+        int empty = 0;
 
         spin_lock(&root->inode_lock);
         if (!RB_EMPTY_NODE(&BTRFS_I(inode)->rb_node)) {
                 rb_erase(&BTRFS_I(inode)->rb_node, &root->inode_tree);
                 RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node);
+                empty = RB_EMPTY_ROOT(&root->inode_tree);
+        }
+        spin_unlock(&root->inode_lock);
+
+        if (empty && btrfs_root_refs(&root->root_item) == 0) {
+                synchronize_srcu(&root->fs_info->subvol_srcu);
+                spin_lock(&root->inode_lock);
+                empty = RB_EMPTY_ROOT(&root->inode_tree);
+                spin_unlock(&root->inode_lock);
+                if (empty)
+                        btrfs_add_dead_root(root);
+        }
+}
+
+int btrfs_invalidate_inodes(struct btrfs_root *root)
+{
+        struct rb_node *node;
+        struct rb_node *prev;
+        struct btrfs_inode *entry;
+        struct inode *inode;
+        u64 objectid = 0;
+
+        WARN_ON(btrfs_root_refs(&root->root_item) != 0);
+
+        spin_lock(&root->inode_lock);
+again:
+        node = root->inode_tree.rb_node;
+        prev = NULL;
+        while (node) {
+                prev = node;
+                entry = rb_entry(node, struct btrfs_inode, rb_node);
+
+                if (objectid < entry->vfs_inode.i_ino)
+                        node = node->rb_left;
+                else if (objectid > entry->vfs_inode.i_ino)
+                        node = node->rb_right;
+                else
+                        break;
+        }
+        if (!node) {
+                while (prev) {
+                        entry = rb_entry(prev, struct btrfs_inode, rb_node);
+                        if (objectid <= entry->vfs_inode.i_ino) {
+                                node = prev;
+                                break;
+                        }
+                        prev = rb_next(prev);
+                }
+        }
+        while (node) {
+                entry = rb_entry(node, struct btrfs_inode, rb_node);
+                objectid = entry->vfs_inode.i_ino + 1;
+                inode = igrab(&entry->vfs_inode);
+                if (inode) {
+                        spin_unlock(&root->inode_lock);
+                        if (atomic_read(&inode->i_count) > 1)
+                                d_prune_aliases(inode);
+                        /*
+                         * btrfs_drop_inode will remove it from
+                         * the inode cache when its usage count
+                         * hits zero.
+                         */
+                        iput(inode);
+                        cond_resched();
+                        spin_lock(&root->inode_lock);
+                        goto again;
+                }
+
+                if (cond_resched_lock(&root->inode_lock))
+                        goto again;
+
+                node = rb_next(node);
         }
         spin_unlock(&root->inode_lock);
+        return 0;
 }
 
 static noinline void init_btrfs_i(struct inode *inode)
@@ -3225,15 +3525,41 @@ struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
         return inode;
 }
 
+static struct inode *new_simple_dir(struct super_block *s,
+                                    struct btrfs_key *key,
+                                    struct btrfs_root *root)
+{
+        struct inode *inode = new_inode(s);
+
+        if (!inode)
+                return ERR_PTR(-ENOMEM);
+
+        init_btrfs_i(inode);
+
+        BTRFS_I(inode)->root = root;
+        memcpy(&BTRFS_I(inode)->location, key, sizeof(*key));
+        BTRFS_I(inode)->dummy_inode = 1;
+
+        inode->i_ino = BTRFS_EMPTY_SUBVOL_DIR_OBJECTID;
+        inode->i_op = &simple_dir_inode_operations;
+        inode->i_fop = &simple_dir_operations;
+        inode->i_mode = S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO;
+        inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
+
+        return inode;
+}
+
 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry)
 {
         struct inode *inode;
-        struct btrfs_inode *bi = BTRFS_I(dir);
-        struct btrfs_root *root = bi->root;
+        struct btrfs_root *root = BTRFS_I(dir)->root;
         struct btrfs_root *sub_root = root;
         struct btrfs_key location;
+        int index;
         int ret;
 
+        dentry->d_op = &btrfs_dentry_operations;
+
         if (dentry->d_name.len > BTRFS_NAME_LEN)
                 return ERR_PTR(-ENAMETOOLONG);
 
@@ -3242,29 +3568,50 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry)
         if (ret < 0)
                 return ERR_PTR(ret);
 
-        inode = NULL;
-        if (location.objectid) {
-                ret = fixup_tree_root_location(root, &location, &sub_root,
-                                                dentry);
-                if (ret < 0)
-                        return ERR_PTR(ret);
-                if (ret > 0)
-                        return ERR_PTR(-ENOENT);
+        if (location.objectid == 0)
+                return NULL;
+
+        if (location.type == BTRFS_INODE_ITEM_KEY) {
+                inode = btrfs_iget(dir->i_sb, &location, root);
+                return inode;
+        }
+
+        BUG_ON(location.type != BTRFS_ROOT_ITEM_KEY);
+
+        index = srcu_read_lock(&root->fs_info->subvol_srcu);
+        ret = fixup_tree_root_location(root, dir, dentry,
+                                       &location, &sub_root);
+        if (ret < 0) {
+                if (ret != -ENOENT)
+                        inode = ERR_PTR(ret);
+                else
+                        inode = new_simple_dir(dir->i_sb, &location, sub_root);
+        } else {
                 inode = btrfs_iget(dir->i_sb, &location, sub_root);
-                if (IS_ERR(inode))
-                        return ERR_CAST(inode);
         }
+        srcu_read_unlock(&root->fs_info->subvol_srcu, index);
+
         return inode;
 }
 
+static int btrfs_dentry_delete(struct dentry *dentry)
+{
+        struct btrfs_root *root;
+
+        if (!dentry->d_inode)
+                return 0;
+
+        root = BTRFS_I(dentry->d_inode)->root;
+        if (btrfs_root_refs(&root->root_item) == 0)
+                return 1;
+        return 0;
+}
+
 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
                                    struct nameidata *nd)
 {
         struct inode *inode;
 
-        if (dentry->d_name.len > BTRFS_NAME_LEN)
-                return ERR_PTR(-ENAMETOOLONG);
-
         inode = btrfs_lookup_dentry(dir, dentry);
         if (IS_ERR(inode))
                 return ERR_CAST(inode);
@@ -3603,9 +3950,6 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
         if (ret != 0)
                 goto fail;
 
-        if (objectid > root->highest_inode)
-                root->highest_inode = objectid;
-
         inode->i_uid = current_fsuid();
 
         if (dir && (dir->i_mode & S_ISGID)) {
@@ -3673,26 +4017,35 @@ int btrfs_add_link(struct btrfs_trans_handle *trans,
                    struct inode *parent_inode, struct inode *inode,
                    const char *name, int name_len, int add_backref, u64 index)
 {
-        int ret;
+        int ret = 0;
         struct btrfs_key key;
         struct btrfs_root *root = BTRFS_I(parent_inode)->root;
 
-        key.objectid = inode->i_ino;
-        btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
-        key.offset = 0;
+        if (unlikely(inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)) {
+                memcpy(&key, &BTRFS_I(inode)->root->root_key, sizeof(key));
+        } else {
+                key.objectid = inode->i_ino;
+                btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
+                key.offset = 0;
+        }
+
+        if (unlikely(inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)) {
+                ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
+                                         key.objectid, root->root_key.objectid,
+                                         parent_inode->i_ino,
+                                         index, name, name_len);
+        } else if (add_backref) {
+                ret = btrfs_insert_inode_ref(trans, root,
+                                             name, name_len, inode->i_ino,
+                                             parent_inode->i_ino, index);
+        }
 
-        ret = btrfs_insert_dir_item(trans, root, name, name_len,
-                                    parent_inode->i_ino,
-                                    &key, btrfs_inode_type(inode),
-                                    index);
         if (ret == 0) {
-                if (add_backref) {
-                        ret = btrfs_insert_inode_ref(trans, root,
-                                                     name, name_len,
-                                                     inode->i_ino,
-                                                     parent_inode->i_ino,
-                                                     index);
-                }
+                ret = btrfs_insert_dir_item(trans, root, name, name_len,
+                                            parent_inode->i_ino, &key,
+                                            btrfs_inode_type(inode), index);
+                BUG_ON(ret);
+
                 btrfs_i_size_write(parent_inode, parent_inode->i_size +
                                    name_len * 2);
                 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
@@ -3732,11 +4085,18 @@ static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
         if (!new_valid_dev(rdev))
                 return -EINVAL;
 
-        err = btrfs_check_metadata_free_space(root);
+        /*
+         * 2 for inode item and ref
+         * 2 for dir items
+         * 1 for xattr if selinux is on
+         */
+        err = btrfs_reserve_metadata_space(root, 5);
         if (err)
-                goto fail;
+                return err;
 
         trans = btrfs_start_transaction(root, 1);
+        if (!trans)
+                goto fail;
         btrfs_set_trans_block_group(trans, dir);
 
         err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
@@ -3774,6 +4134,7 @@ out_unlock:
         nr = trans->blocks_used;
         btrfs_end_transaction_throttle(trans, root);
 fail:
+        btrfs_unreserve_metadata_space(root, 5);
         if (drop_inode) {
                 inode_dec_link_count(inode);
                 iput(inode);
@@ -3794,10 +4155,18 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
         u64 objectid;
         u64 index = 0;
 
-        err = btrfs_check_metadata_free_space(root);
+        /*
+         * 2 for inode item and ref
+         * 2 for dir items
+         * 1 for xattr if selinux is on
+         */
+        err = btrfs_reserve_metadata_space(root, 5);
         if (err)
-                goto fail;
+                return err;
+
         trans = btrfs_start_transaction(root, 1);
+        if (!trans)
+                goto fail;
         btrfs_set_trans_block_group(trans, dir);
 
         err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
@@ -3838,6 +4207,7 @@ out_unlock:
         nr = trans->blocks_used;
         btrfs_end_transaction_throttle(trans, root);
 fail:
+        btrfs_unreserve_metadata_space(root, 5);
         if (drop_inode) {
                 inode_dec_link_count(inode);
                 iput(inode);
@@ -3860,10 +4230,16 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
         if (inode->i_nlink == 0)
                 return -ENOENT;
 
-        btrfs_inc_nlink(inode);
-        err = btrfs_check_metadata_free_space(root);
+        /*
+         * 1 item for inode ref
+         * 2 items for dir items
+         */
+        err = btrfs_reserve_metadata_space(root, 3);
         if (err)
-                goto fail;
+                return err;
+
+        btrfs_inc_nlink(inode);
+
         err = btrfs_set_inode_index(dir, &index);
         if (err)
                 goto fail;
@@ -3875,20 +4251,19 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
 
         err = btrfs_add_nondir(trans, dentry, inode, 1, index);
 
-        if (err)
-                drop_inode = 1;
-
-        btrfs_update_inode_block_group(trans, dir);
-        err = btrfs_update_inode(trans, root, inode);
-
-        if (err)
+        if (err) {
                 drop_inode = 1;
+        } else {
+                btrfs_update_inode_block_group(trans, dir);
+                err = btrfs_update_inode(trans, root, inode);
+                BUG_ON(err);
+                btrfs_log_new_name(trans, inode, NULL, dentry->d_parent);
+        }
 
         nr = trans->blocks_used;
-
-        btrfs_log_new_name(trans, inode, NULL, dentry->d_parent);
         btrfs_end_transaction_throttle(trans, root);
 fail:
+        btrfs_unreserve_metadata_space(root, 3);
         if (drop_inode) {
                 inode_dec_link_count(inode);
                 iput(inode);
@@ -3908,17 +4283,21 @@ static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
         u64 index = 0;
         unsigned long nr = 1;
 
-        err = btrfs_check_metadata_free_space(root);
+        /*
+         * 2 items for inode and ref
+         * 2 items for dir items
+         * 1 for xattr if selinux is on
+         */
+        err = btrfs_reserve_metadata_space(root, 5);
         if (err)
-                goto out_unlock;
+                return err;
 
         trans = btrfs_start_transaction(root, 1);
-        btrfs_set_trans_block_group(trans, dir);
-
-        if (IS_ERR(trans)) {
-                err = PTR_ERR(trans);
+        if (!trans) {
+                err = -ENOMEM;
                 goto out_unlock;
         }
+        btrfs_set_trans_block_group(trans, dir);
 
         err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
         if (err) {
@@ -3967,6 +4346,7 @@ out_fail:
         btrfs_end_transaction_throttle(trans, root);
 
 out_unlock:
+        btrfs_unreserve_metadata_space(root, 5);
         if (drop_on_err)
                 iput(inode);
         btrfs_btree_balance_dirty(root, nr);
@@ -4064,11 +4444,11 @@ struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
         int compressed;
 
 again:
-        spin_lock(&em_tree->lock);
+        read_lock(&em_tree->lock);
         em = lookup_extent_mapping(em_tree, start, len);
         if (em)
                 em->bdev = root->fs_info->fs_devices->latest_bdev;
-        spin_unlock(&em_tree->lock);
+        read_unlock(&em_tree->lock);
 
         if (em) {
                 if (em->start > start || em->start + em->len <= start)
@@ -4215,6 +4595,11 @@ again:
                                 map = kmap(page);
                                 read_extent_buffer(leaf, map + pg_offset, ptr,
                                                    copy_size);
+                                if (pg_offset + copy_size < PAGE_CACHE_SIZE) {
+                                        memset(map + pg_offset + copy_size, 0,
+                                               PAGE_CACHE_SIZE - pg_offset -
+                                               copy_size);
+                                }
                                 kunmap(page);
                         }
                         flush_dcache_page(page);
@@ -4259,7 +4644,7 @@ insert:
         }
 
         err = 0;
-        spin_lock(&em_tree->lock);
+        write_lock(&em_tree->lock);
         ret = add_extent_mapping(em_tree, em);
         /* it is possible that someone inserted the extent into the tree
          * while we had the lock dropped.  It is also possible that
@@ -4299,7 +4684,7 @@ insert:
                         err = 0;
                 }
         }
-        spin_unlock(&em_tree->lock);
+        write_unlock(&em_tree->lock);
 out:
         if (path)
                 btrfs_free_path(path);
@@ -4398,13 +4783,21 @@ static void btrfs_invalidatepage(struct page *page, unsigned long offset)
         u64 page_start = page_offset(page);
         u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
 
+
+        /*
+         * we have the page locked, so new writeback can't start,
+         * and the dirty bit won't be cleared while we are here.
+         *
+         * Wait for IO on this page so that we can safely clear
+         * the PagePrivate2 bit and do ordered accounting
+         */
         wait_on_page_writeback(page);
+
         tree = &BTRFS_I(page->mapping->host)->io_tree;
         if (offset) {
                 btrfs_releasepage(page, GFP_NOFS);
                 return;
         }
-
         lock_extent(tree, page_start, page_end, GFP_NOFS);
         ordered = btrfs_lookup_ordered_extent(page->mapping->host,
                                            page_offset(page));
@@ -4415,16 +4808,21 @@ static void btrfs_invalidatepage(struct page *page, unsigned long offset)
                  */
                 clear_extent_bit(tree, page_start, page_end,
                                  EXTENT_DIRTY | EXTENT_DELALLOC |
-                                 EXTENT_LOCKED, 1, 0, GFP_NOFS);
-                btrfs_finish_ordered_io(page->mapping->host,
-                                        page_start, page_end);
+                                 EXTENT_LOCKED, 1, 0, NULL, GFP_NOFS);
+                /*
+                 * whoever cleared the private bit is responsible
+                 * for the finish_ordered_io
+                 */
+                if (TestClearPagePrivate2(page)) {
+                        btrfs_finish_ordered_io(page->mapping->host,
+                                                page_start, page_end);
+                }
                 btrfs_put_ordered_extent(ordered);
                 lock_extent(tree, page_start, page_end, GFP_NOFS);
         }
         clear_extent_bit(tree, page_start, page_end,
-                 EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC |
-                 EXTENT_ORDERED,
-                 1, 1, GFP_NOFS);
+                 EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC,
+                 1, 1, NULL, GFP_NOFS);
         __btrfs_releasepage(page, GFP_NOFS);
 
         ClearPageChecked(page);
@@ -4473,6 +4871,13 @@ int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
                 goto out;
         }
 
+        ret = btrfs_reserve_metadata_for_delalloc(root, inode, 1);
+        if (ret) {
+                btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE);
+                ret = VM_FAULT_SIGBUS;
+                goto out;
+        }
+
         ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */
 again:
         lock_page(page);
@@ -4504,7 +4909,23 @@ again:
                 goto again;
         }
 
-        btrfs_set_extent_delalloc(inode, page_start, page_end);
+        /*
+         * XXX - page_mkwrite gets called every time the page is dirtied, even
+         * if it was already dirty, so for space accounting reasons we need to
+         * clear any delalloc bits for the range we are fixing to save.  There
+         * is probably a better way to do this, but for now keep consistent with
+         * prepare_pages in the normal write path.
+         */
+        clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, page_end,
+                          EXTENT_DIRTY | EXTENT_DELALLOC, GFP_NOFS);
+
+        ret = btrfs_set_extent_delalloc(inode, page_start, page_end);
+        if (ret) {
+                unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
+                ret = VM_FAULT_SIGBUS;
+                btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE);
+                goto out_unlock;
+        }
         ret = 0;
 
         /* page is wholly or partially inside EOF */
@@ -4521,11 +4942,15 @@ again:
         }
         ClearPageChecked(page);
         set_page_dirty(page);
+        SetPageUptodate(page);
 
         BTRFS_I(inode)->last_trans = root->fs_info->generation + 1;
         unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
 
 out_unlock:
+        btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
+        if (!ret)
+                return VM_FAULT_LOCKED;
         unlock_page(page);
 out:
         return ret;
@@ -4594,11 +5019,11 @@ out:
  * create a new subvolume directory/inode (helper for the ioctl).
  */
 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
-                             struct btrfs_root *new_root, struct dentry *dentry,
+                             struct btrfs_root *new_root,
                              u64 new_dirid, u64 alloc_hint)
 {
         struct inode *inode;
-        int error;
+        int err;
         u64 index = 0;
 
         inode = btrfs_new_inode(trans, new_root, NULL, "..", 2, new_dirid,
@@ -4611,11 +5036,10 @@ int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
         inode->i_nlink = 1;
         btrfs_i_size_write(inode, 0);
 
-        error = btrfs_update_inode(trans, new_root, inode);
-        if (error)
-                return error;
+        err = btrfs_update_inode(trans, new_root, inode);
+        BUG_ON(err);
 
-        d_instantiate(dentry, inode);
+        iput(inode);
         return 0;
 }
 
@@ -4641,6 +5065,8 @@ struct inode *btrfs_alloc_inode(struct super_block *sb)
                 return NULL;
         ei->last_trans = 0;
         ei->logged_trans = 0;
+        ei->delalloc_extents = 0;
+        ei->delalloc_reserved_extents = 0;
         btrfs_ordered_inode_tree_init(&ei->ordered_tree);
         INIT_LIST_HEAD(&ei->i_orphan);
         INIT_LIST_HEAD(&ei->ordered_operations);
@@ -4693,6 +5119,16 @@ void btrfs_destroy_inode(struct inode *inode)
         kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
 }
 
+void btrfs_drop_inode(struct inode *inode)
+{
+        struct btrfs_root *root = BTRFS_I(inode)->root;
+
+        if (inode->i_nlink > 0 && btrfs_root_refs(&root->root_item) == 0)
+                generic_delete_inode(inode);
+        else
+                generic_drop_inode(inode);
+}
+
 static void init_once(void *foo)
 {
         struct btrfs_inode *ei = (struct btrfs_inode *) foo;
@@ -4761,31 +5197,37 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 {
         struct btrfs_trans_handle *trans;
         struct btrfs_root *root = BTRFS_I(old_dir)->root;
+        struct btrfs_root *dest = BTRFS_I(new_dir)->root;
         struct inode *new_inode = new_dentry->d_inode;
         struct inode *old_inode = old_dentry->d_inode;
         struct timespec ctime = CURRENT_TIME;
         u64 index = 0;
+        u64 root_objectid;
         int ret;
 
-        /* we're not allowed to rename between subvolumes */
-        if (BTRFS_I(old_inode)->root->root_key.objectid !=
-            BTRFS_I(new_dir)->root->root_key.objectid)
+        if (new_dir->i_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)
+                return -EPERM;
+
+        /* we only allow rename subvolume link between subvolumes */
+        if (old_inode->i_ino != BTRFS_FIRST_FREE_OBJECTID && root != dest)
                 return -EXDEV;
 
+        if (old_inode->i_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID ||
+            (new_inode && new_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID))
+                return -ENOTEMPTY;
+
         if (S_ISDIR(old_inode->i_mode) && new_inode &&
-            new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
+            new_inode->i_size > BTRFS_EMPTY_DIR_SIZE)
                 return -ENOTEMPTY;
-        }
 
-        /* to rename a snapshot or subvolume, we need to juggle the
-         * backrefs.  This isn't coded yet
+        /*
+         * 2 items for dir items
+         * 1 item for orphan entry
+         * 1 item for ref
          */
-        if (old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
-                return -EXDEV;
-
-        ret = btrfs_check_metadata_free_space(root);
+        ret = btrfs_reserve_metadata_space(root, 4);
         if (ret)
-                goto out_unlock;
+                return ret;
 
         /*
          * we're using rename to replace one file with another.
@@ -4796,8 +5238,40 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
             old_inode->i_size > BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT)
                 filemap_flush(old_inode->i_mapping);
 
+        /* close the racy window with snapshot create/destroy ioctl */
+        if (old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
+                down_read(&root->fs_info->subvol_sem);
+
         trans = btrfs_start_transaction(root, 1);
+        btrfs_set_trans_block_group(trans, new_dir);
+
+        if (dest != root)
+                btrfs_record_root_in_trans(trans, dest);
+
+        ret = btrfs_set_inode_index(new_dir, &index);
+        if (ret)
+                goto out_fail;
 
+        if (unlikely(old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)) {
+                /* force full log commit if subvolume involved. */
+                root->fs_info->last_trans_log_full_commit = trans->transid;
+        } else {
+                ret = btrfs_insert_inode_ref(trans, dest,
+                                             new_dentry->d_name.name,
+                                             new_dentry->d_name.len,
+                                             old_inode->i_ino,
+                                             new_dir->i_ino, index);
+                if (ret)
+                        goto out_fail;
+                /*
+                 * this is an ugly little race, but the rename is required
+                 * to make sure that if we crash, the inode is either at the
+                 * old name or the new one.  pinning the log transaction lets
+                 * us make sure we don't allow a log commit to come in after
+                 * we unlink the name but before we add the new name back in.
+                 */
+                btrfs_pin_log_trans(root);
+        }
         /*
          * make sure the inode gets flushed if it is replacing
          * something.
@@ -4807,18 +5281,6 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
                 btrfs_add_ordered_operation(trans, root, old_inode);
         }
 
-        /*
-         * this is an ugly little race, but the rename is required to make
-         * sure that if we crash, the inode is either at the old name
-         * or the new one.  pinning the log transaction lets us make sure
-         * we don't allow a log commit to come in after we unlink the
-         * name but before we add the new name back in.
-         */
-        btrfs_pin_log_trans(root);
-
-        btrfs_set_trans_block_group(trans, new_dir);
-
-        btrfs_inc_nlink(old_dentry->d_inode);
         old_dir->i_ctime = old_dir->i_mtime = ctime;
         new_dir->i_ctime = new_dir->i_mtime = ctime;
         old_inode->i_ctime = ctime;
@@ -4826,47 +5288,60 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
         if (old_dentry->d_parent != new_dentry->d_parent)
                 btrfs_record_unlink_dir(trans, old_dir, old_inode, 1);
 
-        ret = btrfs_unlink_inode(trans, root, old_dir, old_dentry->d_inode,
-                                 old_dentry->d_name.name,
-                                 old_dentry->d_name.len);
-        if (ret)
-                goto out_fail;
+        if (unlikely(old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)) {
+                root_objectid = BTRFS_I(old_inode)->root->root_key.objectid;
+                ret = btrfs_unlink_subvol(trans, root, old_dir, root_objectid,
+                                        old_dentry->d_name.name,
+                                        old_dentry->d_name.len);
+        } else {
+                btrfs_inc_nlink(old_dentry->d_inode);
+                ret = btrfs_unlink_inode(trans, root, old_dir,
+                                         old_dentry->d_inode,
+                                         old_dentry->d_name.name,
+                                         old_dentry->d_name.len);
+        }
+        BUG_ON(ret);
 
         if (new_inode) {
                 new_inode->i_ctime = CURRENT_TIME;
-                ret = btrfs_unlink_inode(trans, root, new_dir,
-                                         new_dentry->d_inode,
-                                         new_dentry->d_name.name,
-                                         new_dentry->d_name.len);
-                if (ret)
-                        goto out_fail;
+                if (unlikely(new_inode->i_ino ==
+                             BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) {
+                        root_objectid = BTRFS_I(new_inode)->location.objectid;
+                        ret = btrfs_unlink_subvol(trans, dest, new_dir,
+                                                root_objectid,
+                                                new_dentry->d_name.name,
+                                                new_dentry->d_name.len);
+                        BUG_ON(new_inode->i_nlink == 0);
+                } else {
+                        ret = btrfs_unlink_inode(trans, dest, new_dir,
+                                                 new_dentry->d_inode,
+                                                 new_dentry->d_name.name,
+                                                 new_dentry->d_name.len);
+                }
+                BUG_ON(ret);
                 if (new_inode->i_nlink == 0) {
                         ret = btrfs_orphan_add(trans, new_dentry->d_inode);
-                        if (ret)
-                                goto out_fail;
+                        BUG_ON(ret);
                 }
-
         }
-        ret = btrfs_set_inode_index(new_dir, &index);
-        if (ret)
-                goto out_fail;
 
-        ret = btrfs_add_link(trans, new_dentry->d_parent->d_inode,
-                             old_inode, new_dentry->d_name.name,
-                             new_dentry->d_name.len, 1, index);
-        if (ret)
-                goto out_fail;
+        ret = btrfs_add_link(trans, new_dir, old_inode,
+                             new_dentry->d_name.name,
+                             new_dentry->d_name.len, 0, index);
+        BUG_ON(ret);
 
-        btrfs_log_new_name(trans, old_inode, old_dir,
-                                       new_dentry->d_parent);
+        if (old_inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) {
+                btrfs_log_new_name(trans, old_inode, old_dir,
+                                   new_dentry->d_parent);
+                btrfs_end_log_trans(root);
+        }
 out_fail:
-
-        /* this btrfs_end_log_trans just allows the current
-         * log-sub transaction to complete
-         */
-        btrfs_end_log_trans(root);
         btrfs_end_transaction_throttle(trans, root);
-out_unlock:
+
+        if (old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
+                up_read(&root->fs_info->subvol_sem);
+
+        btrfs_unreserve_metadata_space(root, 4);
         return ret;
 }
 
@@ -4938,11 +5413,18 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
         if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
                 return -ENAMETOOLONG;
 
-        err = btrfs_check_metadata_free_space(root);
+        /*
+         * 2 items for inode item and ref
+         * 2 items for dir items
+         * 1 item for xattr if selinux is on
+         */
+        err = btrfs_reserve_metadata_space(root, 5);
         if (err)
-                goto out_fail;
+                return err;
 
         trans = btrfs_start_transaction(root, 1);
+        if (!trans)
+                goto out_fail;
         btrfs_set_trans_block_group(trans, dir);
 
         err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
@@ -5023,6 +5505,7 @@ out_unlock:
         nr = trans->blocks_used;
         btrfs_end_transaction_throttle(trans, root);
 out_fail:
+        btrfs_unreserve_metadata_space(root, 5);
         if (drop_inode) {
                 inode_dec_link_count(inode);
                 iput(inode);
@@ -5044,6 +5527,11 @@ static int prealloc_file_range(struct btrfs_trans_handle *trans,
 
         while (num_bytes > 0) {
                 alloc_size = min(num_bytes, root->fs_info->max_extent);
+
+                ret = btrfs_reserve_metadata_space(root, 1);
+                if (ret)
+                        goto out;
+
                 ret = btrfs_reserve_extent(trans, root, alloc_size,
                                            root->sectorsize, 0, alloc_hint,
                                            (u64)-1, &ins, 1);
@@ -5058,9 +5546,12 @@ static int prealloc_file_range(struct btrfs_trans_handle *trans,
                                                   0, 0, 0,
                                                   BTRFS_FILE_EXTENT_PREALLOC);
                 BUG_ON(ret);
+                btrfs_drop_extent_cache(inode, cur_offset,
+                                        cur_offset + ins.offset -1, 0);
                 num_bytes -= ins.offset;
                 cur_offset += ins.offset;
                 alloc_hint = ins.objectid + ins.offset;
+                btrfs_unreserve_metadata_space(root, 1);
         }
 out:
         if (cur_offset > start) {
@@ -5201,7 +5692,7 @@ static int btrfs_permission(struct inode *inode, int mask)
         return generic_permission(inode, mask, btrfs_check_acl);
 }
 
-static struct inode_operations btrfs_dir_inode_operations = {
+static const struct inode_operations btrfs_dir_inode_operations = {
         .getattr        = btrfs_getattr,
         .lookup         = btrfs_lookup,
         .create         = btrfs_create,
@@ -5219,11 +5710,12 @@ static struct inode_operations btrfs_dir_inode_operations = {
         .removexattr    = btrfs_removexattr,
         .permission     = btrfs_permission,
 };
-static struct inode_operations btrfs_dir_ro_inode_operations = {
+static const struct inode_operations btrfs_dir_ro_inode_operations = {
         .lookup         = btrfs_lookup,
         .permission     = btrfs_permission,
 };
-static struct file_operations btrfs_dir_file_operations = {
+
+static const struct file_operations btrfs_dir_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = generic_read_dir,
         .readdir        = btrfs_real_readdir,
@@ -5245,6 +5737,8 @@ static struct extent_io_ops btrfs_extent_io_ops = {
         .readpage_io_failed_hook = btrfs_io_failed_hook,
         .set_bit_hook = btrfs_set_bit_hook,
         .clear_bit_hook = btrfs_clear_bit_hook,
+        .merge_extent_hook = btrfs_merge_extent_hook,
+        .split_extent_hook = btrfs_split_extent_hook,
 };
 
 /*
@@ -5259,7 +5753,7 @@ static struct extent_io_ops btrfs_extent_io_ops = {
  *
  * For now we're avoiding this by dropping bmap.
  */
-static struct address_space_operations btrfs_aops = {
+static const struct address_space_operations btrfs_aops = {
         .readpage       = btrfs_readpage,
         .writepage      = btrfs_writepage,
         .writepages     = btrfs_writepages,
@@ -5269,16 +5763,17 @@ static struct address_space_operations btrfs_aops = {
         .invalidatepage = btrfs_invalidatepage,
         .releasepage    = btrfs_releasepage,
         .set_page_dirty = btrfs_set_page_dirty,
+        .error_remove_page = generic_error_remove_page,
 };
 
-static struct address_space_operations btrfs_symlink_aops = {
+static const struct address_space_operations btrfs_symlink_aops = {
         .readpage       = btrfs_readpage,
         .writepage      = btrfs_writepage,
         .invalidatepage = btrfs_invalidatepage,
         .releasepage    = btrfs_releasepage,
 };
 
-static struct inode_operations btrfs_file_inode_operations = {
+static const struct inode_operations btrfs_file_inode_operations = {
         .truncate       = btrfs_truncate,
         .getattr        = btrfs_getattr,
         .setattr        = btrfs_setattr,
@@ -5290,7 +5785,7 @@ static struct inode_operations btrfs_file_inode_operations = {
         .fallocate      = btrfs_fallocate,
         .fiemap         = btrfs_fiemap,
 };
-static struct inode_operations btrfs_special_inode_operations = {
+static const struct inode_operations btrfs_special_inode_operations = {
         .getattr        = btrfs_getattr,
         .setattr        = btrfs_setattr,
         .permission     = btrfs_permission,
@@ -5299,7 +5794,7 @@ static struct inode_operations btrfs_special_inode_operations = {
         .listxattr      = btrfs_listxattr,
         .removexattr    = btrfs_removexattr,
 };
-static struct inode_operations btrfs_symlink_inode_operations = {
+static const struct inode_operations btrfs_symlink_inode_operations = {
         .readlink       = generic_readlink,
         .follow_link    = page_follow_link_light,
         .put_link       = page_put_link,
@@ -5309,3 +5804,7 @@ static struct inode_operations btrfs_symlink_inode_operations = {
         .listxattr      = btrfs_listxattr,
         .removexattr    = btrfs_removexattr,
 };
+
+struct dentry_operations btrfs_dentry_operations = {
+        .d_delete       = btrfs_dentry_delete,
+};
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index bd88f25889f7..9a780c8d0ac8 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -230,8 +230,8 @@ static noinline int create_subvol(struct btrfs_root *root,
         struct btrfs_root_item root_item;
         struct btrfs_inode_item *inode_item;
         struct extent_buffer *leaf;
-        struct btrfs_root *new_root = root;
-        struct inode *dir;
+        struct btrfs_root *new_root;
+        struct inode *dir = dentry->d_parent->d_inode;
         int ret;
         int err;
         u64 objectid;
@@ -239,9 +239,15 @@ static noinline int create_subvol(struct btrfs_root *root,
         u64 index = 0;
         unsigned long nr = 1;
 
-        ret = btrfs_check_metadata_free_space(root);
+        /*
+         * 1 - inode item
+         * 2 - refs
+         * 1 - root item
+         * 2 - dir items
+         */
+        ret = btrfs_reserve_metadata_space(root, 6);
         if (ret)
-                goto fail_commit;
+                return ret;
 
         trans = btrfs_start_transaction(root, 1);
         BUG_ON(!trans);
@@ -304,11 +310,17 @@ static noinline int create_subvol(struct btrfs_root *root,
         if (ret)
                 goto fail;
 
+        key.offset = (u64)-1;
+        new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
+        BUG_ON(IS_ERR(new_root));
+
+        btrfs_record_root_in_trans(trans, new_root);
+
+        ret = btrfs_create_subvol_root(trans, new_root, new_dirid,
+                                       BTRFS_I(dir)->block_group);
         /*
          * insert the directory item
          */
-        key.offset = (u64)-1;
-        dir = dentry->d_parent->d_inode;
         ret = btrfs_set_inode_index(dir, &index);
         BUG_ON(ret);
 
@@ -322,43 +334,20 @@ static noinline int create_subvol(struct btrfs_root *root,
         ret = btrfs_update_inode(trans, root, dir);
         BUG_ON(ret);
 
-        /* add the backref first */
         ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
-                                 objectid, BTRFS_ROOT_BACKREF_KEY,
-                                 root->root_key.objectid,
+                                 objectid, root->root_key.objectid,
                                  dir->i_ino, index, name, namelen);
 
         BUG_ON(ret);
 
-        /* now add the forward ref */
-        ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
-                                 root->root_key.objectid, BTRFS_ROOT_REF_KEY,
-                                 objectid,
-                                 dir->i_ino, index, name, namelen);
-
-        BUG_ON(ret);
-
-        ret = btrfs_commit_transaction(trans, root);
-        if (ret)
-                goto fail_commit;
-
-        new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
-        BUG_ON(!new_root);
-
-        trans = btrfs_start_transaction(new_root, 1);
-        BUG_ON(!trans);
-
-        ret = btrfs_create_subvol_root(trans, new_root, dentry, new_dirid,
-                                       BTRFS_I(dir)->block_group);
-        if (ret)
-                goto fail;
-
+        d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
 fail:
         nr = trans->blocks_used;
-        err = btrfs_commit_transaction(trans, new_root);
+        err = btrfs_commit_transaction(trans, root);
         if (err && !ret)
                 ret = err;
-fail_commit:
+
+        btrfs_unreserve_metadata_space(root, 6);
         btrfs_btree_balance_dirty(root, nr);
         return ret;
 }
@@ -375,19 +364,27 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
         if (!root->ref_cows)
                 return -EINVAL;
 
-        ret = btrfs_check_metadata_free_space(root);
+        /*
+         * 1 - inode item
+         * 2 - refs
+         * 1 - root item
+         * 2 - dir items
+         */
+        ret = btrfs_reserve_metadata_space(root, 6);
         if (ret)
                 goto fail_unlock;
 
         pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
         if (!pending_snapshot) {
                 ret = -ENOMEM;
+                btrfs_unreserve_metadata_space(root, 6);
                 goto fail_unlock;
         }
         pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
         if (!pending_snapshot->name) {
                 ret = -ENOMEM;
                 kfree(pending_snapshot);
+                btrfs_unreserve_metadata_space(root, 6);
                 goto fail_unlock;
         }
         memcpy(pending_snapshot->name, name, namelen);
@@ -420,14 +417,15 @@ static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
  * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
  * inside this filesystem so it's quite a bit simpler.
  */
-static noinline int btrfs_mksubvol(struct path *parent, char *name,
-                                   int mode, int namelen,
+static noinline int btrfs_mksubvol(struct path *parent,
+                                   char *name, int namelen,
                                    struct btrfs_root *snap_src)
 {
+        struct inode *dir  = parent->dentry->d_inode;
         struct dentry *dentry;
         int error;
 
-        mutex_lock_nested(&parent->dentry->d_inode->i_mutex, I_MUTEX_PARENT);
+        mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
 
         dentry = lookup_one_len(name, parent->dentry, namelen);
         error = PTR_ERR(dentry);
@@ -438,99 +436,39 @@ static noinline int btrfs_mksubvol(struct path *parent, char *name,
         if (dentry->d_inode)
                 goto out_dput;
 
-        if (!IS_POSIXACL(parent->dentry->d_inode))
-                mode &= ~current_umask();
-
         error = mnt_want_write(parent->mnt);
         if (error)
                 goto out_dput;
 
-        error = btrfs_may_create(parent->dentry->d_inode, dentry);
+        error = btrfs_may_create(dir, dentry);
         if (error)
                 goto out_drop_write;
 
-        /*
-         * Actually perform the low-level subvolume creation after all
-         * this VFS fuzz.
-         *
-         * Eventually we want to pass in an inode under which we create this
-         * subvolume, but for now all are under the filesystem root.
-         *
-         * Also we should pass on the mode eventually to allow creating new
-         * subvolume with specific mode bits.
-         */
+        down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
+
+        if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
+                goto out_up_read;
+
         if (snap_src) {
-                struct dentry *dir = dentry->d_parent;
-                struct dentry *test = dir->d_parent;
-                struct btrfs_path *path = btrfs_alloc_path();
-                int ret;
-                u64 test_oid;
-                u64 parent_oid = BTRFS_I(dir->d_inode)->root->root_key.objectid;
-
-                test_oid = snap_src->root_key.objectid;
-
-                ret = btrfs_find_root_ref(snap_src->fs_info->tree_root,
-                                          path, parent_oid, test_oid);
-                if (ret == 0)
-                        goto create;
-                btrfs_release_path(snap_src->fs_info->tree_root, path);
-
-                /* we need to make sure we aren't creating a directory loop
-                 * by taking a snapshot of something that has our current
-                 * subvol in its directory tree.  So, this loops through
-                 * the dentries and checks the forward refs for each subvolume
-                 * to see if is references the subvolume where we are
-                 * placing this new snapshot.
-                 */
-                while (1) {
-                        if (!test ||
-                            dir == snap_src->fs_info->sb->s_root ||
-                            test == snap_src->fs_info->sb->s_root ||
-                            test->d_inode->i_sb != snap_src->fs_info->sb) {
-                                break;
-                        }
-                        if (S_ISLNK(test->d_inode->i_mode)) {
-                                printk(KERN_INFO "Btrfs symlink in snapshot "
-                                       "path, failed\n");
-                                error = -EMLINK;
-                                btrfs_free_path(path);
-                                goto out_drop_write;
-                        }
-                        test_oid =
-                                BTRFS_I(test->d_inode)->root->root_key.objectid;
-                        ret = btrfs_find_root_ref(snap_src->fs_info->tree_root,
-                                  path, test_oid, parent_oid);
-                        if (ret == 0) {
-                                printk(KERN_INFO "Btrfs snapshot creation "
-                                       "failed, looping\n");
-                                error = -EMLINK;
-                                btrfs_free_path(path);
-                                goto out_drop_write;
-                        }
-                        btrfs_release_path(snap_src->fs_info->tree_root, path);
-                        test = test->d_parent;
-                }
-create:
-                btrfs_free_path(path);
-                error = create_snapshot(snap_src, dentry, name, namelen);
+                error = create_snapshot(snap_src, dentry,
+                                        name, namelen);
         } else {
-                error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root,
-                                      dentry, name, namelen);
+                error = create_subvol(BTRFS_I(dir)->root, dentry,
+                                      name, namelen);
         }
-        if (error)
-                goto out_drop_write;
-
-        fsnotify_mkdir(parent->dentry->d_inode, dentry);
+        if (!error)
+                fsnotify_mkdir(dir, dentry);
+out_up_read:
+        up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
 out_drop_write:
         mnt_drop_write(parent->mnt);
 out_dput:
         dput(dentry);
 out_unlock:
-        mutex_unlock(&parent->dentry->d_inode->i_mutex);
+        mutex_unlock(&dir->i_mutex);
         return error;
 }
 
-
 static int btrfs_defrag_file(struct file *file)
 {
         struct inode *inode = fdentry(file)->d_inode;
@@ -596,9 +534,8 @@ again:
                 clear_page_dirty_for_io(page);
 
                 btrfs_set_extent_delalloc(inode, page_start, page_end);
-
-                unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
                 set_page_dirty(page);
+                unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
                 unlock_page(page);
                 page_cache_release(page);
                 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
@@ -609,7 +546,8 @@ out_unlock:
         return 0;
 }
 
-static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
+static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
+                                        void __user *arg)
 {
         u64 new_size;
         u64 old_size;
@@ -718,10 +656,7 @@ static noinline int btrfs_ioctl_snap_create(struct file *file,
 {
         struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
         struct btrfs_ioctl_vol_args *vol_args;
-        struct btrfs_dir_item *di;
-        struct btrfs_path *path;
         struct file *src_file;
-        u64 root_dirid;
         int namelen;
         int ret = 0;
 
@@ -739,32 +674,9 @@ static noinline int btrfs_ioctl_snap_create(struct file *file,
                 goto out;
         }
 
-        path = btrfs_alloc_path();
-        if (!path) {
-                ret = -ENOMEM;
-                goto out;
-        }
-
-        root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
-        di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
-                            path, root_dirid,
-                            vol_args->name, namelen, 0);
-        btrfs_free_path(path);
-
-        if (di && !IS_ERR(di)) {
-                ret = -EEXIST;
-                goto out;
-        }
-
-        if (IS_ERR(di)) {
-                ret = PTR_ERR(di);
-                goto out;
-        }
-
         if (subvol) {
-                ret = btrfs_mksubvol(&file->f_path, vol_args->name,
-                                     file->f_path.dentry->d_inode->i_mode,
-                                     namelen, NULL);
+                ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen,
+                                     NULL);
         } else {
                 struct inode *src_inode;
                 src_file = fget(vol_args->fd);
@@ -781,17 +693,156 @@ static noinline int btrfs_ioctl_snap_create(struct file *file,
                         fput(src_file);
                         goto out;
                 }
-                ret = btrfs_mksubvol(&file->f_path, vol_args->name,
-                             file->f_path.dentry->d_inode->i_mode,
-                             namelen, BTRFS_I(src_inode)->root);
+                ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen,
+                                     BTRFS_I(src_inode)->root);
                 fput(src_file);
         }
-
 out:
         kfree(vol_args);
         return ret;
 }
 
+/*
+ * helper to check if the subvolume references other subvolumes
+ */
+static noinline int may_destroy_subvol(struct btrfs_root *root)
+{
+        struct btrfs_path *path;
+        struct btrfs_key key;
+        int ret;
+
+        path = btrfs_alloc_path();
+        if (!path)
+                return -ENOMEM;
+
+        key.objectid = root->root_key.objectid;
+        key.type = BTRFS_ROOT_REF_KEY;
+        key.offset = (u64)-1;
+
+        ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
+                                &key, path, 0, 0);
+        if (ret < 0)
+                goto out;
+        BUG_ON(ret == 0);
+
+        ret = 0;
+        if (path->slots[0] > 0) {
+                path->slots[0]--;
+                btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
+                if (key.objectid == root->root_key.objectid &&
+                    key.type == BTRFS_ROOT_REF_KEY)
+                        ret = -ENOTEMPTY;
+        }
+out:
+        btrfs_free_path(path);
+        return ret;
+}
+
+static noinline int btrfs_ioctl_snap_destroy(struct file *file,
+                                             void __user *arg)
+{
+        struct dentry *parent = fdentry(file);
+        struct dentry *dentry;
+        struct inode *dir = parent->d_inode;
+        struct inode *inode;
+        struct btrfs_root *root = BTRFS_I(dir)->root;
+        struct btrfs_root *dest = NULL;
+        struct btrfs_ioctl_vol_args *vol_args;
+        struct btrfs_trans_handle *trans;
+        int namelen;
+        int ret;
+        int err = 0;
+
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+
+        vol_args = memdup_user(arg, sizeof(*vol_args));
+        if (IS_ERR(vol_args))
+                return PTR_ERR(vol_args);
+
+        vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
+        namelen = strlen(vol_args->name);
+        if (strchr(vol_args->name, '/') ||
+            strncmp(vol_args->name, "..", namelen) == 0) {
+                err = -EINVAL;
+                goto out;
+        }
+
+        err = mnt_want_write(file->f_path.mnt);
+        if (err)
+                goto out;
+
+        mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
+        dentry = lookup_one_len(vol_args->name, parent, namelen);
+        if (IS_ERR(dentry)) {
+                err = PTR_ERR(dentry);
+                goto out_unlock_dir;
+        }
+
+        if (!dentry->d_inode) {
+                err = -ENOENT;
+                goto out_dput;
+        }
+
+        inode = dentry->d_inode;
+        if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) {
+                err = -EINVAL;
+                goto out_dput;
+        }
+
+        dest = BTRFS_I(inode)->root;
+
+        mutex_lock(&inode->i_mutex);
+        err = d_invalidate(dentry);
+        if (err)
+                goto out_unlock;
+
+        down_write(&root->fs_info->subvol_sem);
+
+        err = may_destroy_subvol(dest);
+        if (err)
+                goto out_up_write;
+
+        trans = btrfs_start_transaction(root, 1);
+        ret = btrfs_unlink_subvol(trans, root, dir,
+                                dest->root_key.objectid,
+                                dentry->d_name.name,
+                                dentry->d_name.len);
+        BUG_ON(ret);
+
+        btrfs_record_root_in_trans(trans, dest);
+
+        memset(&dest->root_item.drop_progress, 0,
+                sizeof(dest->root_item.drop_progress));
+        dest->root_item.drop_level = 0;
+        btrfs_set_root_refs(&dest->root_item, 0);
+
+        ret = btrfs_insert_orphan_item(trans,
+                                root->fs_info->tree_root,
+                                dest->root_key.objectid);
+        BUG_ON(ret);
+
+        ret = btrfs_commit_transaction(trans, root);
+        BUG_ON(ret);
+        inode->i_flags |= S_DEAD;
+out_up_write:
+        up_write(&root->fs_info->subvol_sem);
+out_unlock:
+        mutex_unlock(&inode->i_mutex);
+        if (!err) {
+                btrfs_invalidate_inodes(dest);
+                d_delete(dentry);
+        }
+out_dput:
+        dput(dentry);
+out_unlock_dir:
+        mutex_unlock(&dir->i_mutex);
+        mnt_drop_write(file->f_path.mnt);
+out:
+        kfree(vol_args);
+        return err;
+}
+
 static int btrfs_ioctl_defrag(struct file *file)
 {
         struct inode *inode = fdentry(file)->d_inode;
@@ -865,8 +916,8 @@ static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
         return ret;
 }
 
-static long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
-                u64 off, u64 olen, u64 destoff)
+static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
+                                       u64 off, u64 olen, u64 destoff)
 {
         struct inode *inode = fdentry(file)->d_inode;
         struct btrfs_root *root = BTRFS_I(inode)->root;
@@ -976,7 +1027,7 @@ static long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
 
         /* punch hole in destination first */
         btrfs_drop_extents(trans, root, inode, off, off + len,
-                           off + len, 0, &hint_byte);
+                           off + len, 0, &hint_byte, 1);
 
         /* clone data */
         key.objectid = src->i_ino;
@@ -1071,8 +1122,7 @@ static long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
                                         datao += off - key.offset;
                                         datal -= off - key.offset;
                                 }
-                                if (key.offset + datao + datal + key.offset >
-                                    off + len)
+                                if (key.offset + datao + datal > off + len)
                                         datal = off + len - key.offset - datao;
                                 /* disko == 0 means it's a hole */
                                 if (!disko)
@@ -1182,15 +1232,15 @@ static long btrfs_ioctl_trans_start(struct file *file)
         struct inode *inode = fdentry(file)->d_inode;
         struct btrfs_root *root = BTRFS_I(inode)->root;
         struct btrfs_trans_handle *trans;
-        int ret = 0;
+        int ret;
 
+        ret = -EPERM;
         if (!capable(CAP_SYS_ADMIN))
-                return -EPERM;
+                goto out;
 
-        if (file->private_data) {
-                ret = -EINPROGRESS;
+        ret = -EINPROGRESS;
+        if (file->private_data)
                 goto out;
-        }
 
         ret = mnt_want_write(file->f_path.mnt);
         if (ret)
@@ -1200,12 +1250,19 @@ static long btrfs_ioctl_trans_start(struct file *file)
         root->fs_info->open_ioctl_trans++;
         mutex_unlock(&root->fs_info->trans_mutex);
 
+        ret = -ENOMEM;
         trans = btrfs_start_ioctl_transaction(root, 0);
-        if (trans)
-                file->private_data = trans;
-        else
-                ret = -ENOMEM;
-        /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/
+        if (!trans)
+                goto out_drop;
+
+        file->private_data = trans;
+        return 0;
+
+out_drop:
+        mutex_lock(&root->fs_info->trans_mutex);
+        root->fs_info->open_ioctl_trans--;
+        mutex_unlock(&root->fs_info->trans_mutex);
+        mnt_drop_write(file->f_path.mnt);
 out:
         return ret;
 }
@@ -1221,24 +1278,20 @@ long btrfs_ioctl_trans_end(struct file *file)
         struct inode *inode = fdentry(file)->d_inode;
         struct btrfs_root *root = BTRFS_I(inode)->root;
         struct btrfs_trans_handle *trans;
-        int ret = 0;
 
         trans = file->private_data;
-        if (!trans) {
-                ret = -EINVAL;
-                goto out;
-        }
-        btrfs_end_transaction(trans, root);
+        if (!trans)
+                return -EINVAL;
         file->private_data = NULL;
 
+        btrfs_end_transaction(trans, root);
+
         mutex_lock(&root->fs_info->trans_mutex);
         root->fs_info->open_ioctl_trans--;
         mutex_unlock(&root->fs_info->trans_mutex);
 
         mnt_drop_write(file->f_path.mnt);
-
-out:
-        return ret;
+        return 0;
 }
 
 long btrfs_ioctl(struct file *file, unsigned int
@@ -1258,6 +1311,8 @@ long btrfs_ioctl(struct file *file, unsigned int
                 return btrfs_ioctl_snap_create(file, argp, 0);
         case BTRFS_IOC_SUBVOL_CREATE:
                 return btrfs_ioctl_snap_create(file, argp, 1);
+        case BTRFS_IOC_SNAP_DESTROY:
+                return btrfs_ioctl_snap_destroy(file, argp);
         case BTRFS_IOC_DEFRAG:
                 return btrfs_ioctl_defrag(file);
         case BTRFS_IOC_RESIZE:
diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h
index b320b103fa13..bc49914475eb 100644
--- a/fs/btrfs/ioctl.h
+++ b/fs/btrfs/ioctl.h
@@ -65,5 +65,6 @@ struct btrfs_ioctl_clone_range_args {
 
 #define BTRFS_IOC_SUBVOL_CREATE _IOW(BTRFS_IOCTL_MAGIC, 14, \
                                    struct btrfs_ioctl_vol_args)
-
+#define BTRFS_IOC_SNAP_DESTROY _IOW(BTRFS_IOCTL_MAGIC, 15, \
+                                struct btrfs_ioctl_vol_args)
 #endif
diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
index 7b2f401e604e..897fba835f89 100644
--- a/fs/btrfs/ordered-data.c
+++ b/fs/btrfs/ordered-data.c
@@ -159,8 +159,6 @@ static inline struct rb_node *tree_search(struct btrfs_ordered_inode_tree *tree,
  *
  * len is the length of the extent
  *
- * This also sets the EXTENT_ORDERED bit on the range in the inode.
- *
  * The tree is given a single reference on the ordered extent that was
  * inserted.
  */
@@ -181,6 +179,7 @@ int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
         entry->start = start;
         entry->len = len;
         entry->disk_len = disk_len;
+        entry->bytes_left = len;
         entry->inode = inode;
         if (type != BTRFS_ORDERED_IO_DONE && type != BTRFS_ORDERED_COMPLETE)
                 set_bit(type, &entry->flags);
@@ -195,9 +194,6 @@ int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
                            &entry->rb_node);
         BUG_ON(node);
 
-        set_extent_ordered(&BTRFS_I(inode)->io_tree, file_offset,
-                           entry_end(entry) - 1, GFP_NOFS);
-
         spin_lock(&BTRFS_I(inode)->root->fs_info->ordered_extent_lock);
         list_add_tail(&entry->root_extent_list,
                       &BTRFS_I(inode)->root->fs_info->ordered_extents);
@@ -241,13 +237,10 @@ int btrfs_dec_test_ordered_pending(struct inode *inode,
         struct btrfs_ordered_inode_tree *tree;
         struct rb_node *node;
         struct btrfs_ordered_extent *entry;
-        struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
         int ret;
 
         tree = &BTRFS_I(inode)->ordered_tree;
         mutex_lock(&tree->mutex);
-        clear_extent_ordered(io_tree, file_offset, file_offset + io_size - 1,
-                             GFP_NOFS);
         node = tree_search(tree, file_offset);
         if (!node) {
                 ret = 1;
@@ -260,11 +253,16 @@ int btrfs_dec_test_ordered_pending(struct inode *inode,
                 goto out;
         }
 
-        ret = test_range_bit(io_tree, entry->file_offset,
-                             entry->file_offset + entry->len - 1,
-                             EXTENT_ORDERED, 0);
-        if (ret == 0)
+        if (io_size > entry->bytes_left) {
+                printk(KERN_CRIT "bad ordered accounting left %llu size %llu\n",
+                       (unsigned long long)entry->bytes_left,
+                       (unsigned long long)io_size);
+        }
+        entry->bytes_left -= io_size;
+        if (entry->bytes_left == 0)
                 ret = test_and_set_bit(BTRFS_ORDERED_IO_DONE, &entry->flags);
+        else
+                ret = 1;
 out:
         mutex_unlock(&tree->mutex);
         return ret == 0;
@@ -460,7 +458,7 @@ void btrfs_start_ordered_extent(struct inode *inode,
          * start IO on any dirty ones so the wait doesn't stall waiting
          * for pdflush to find them
          */
-        btrfs_fdatawrite_range(inode->i_mapping, start, end, WB_SYNC_ALL);
+        filemap_fdatawrite_range(inode->i_mapping, start, end);
         if (wait) {
                 wait_event(entry->wait, test_bit(BTRFS_ORDERED_COMPLETE,
                                                  &entry->flags));
@@ -476,6 +474,7 @@ int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len)
         u64 orig_end;
         u64 wait_end;
         struct btrfs_ordered_extent *ordered;
+        int found;
 
         if (start + len < start) {
                 orig_end = INT_LIMIT(loff_t);
@@ -489,19 +488,18 @@ again:
         /* start IO across the range first to instantiate any delalloc
          * extents
          */
-        btrfs_fdatawrite_range(inode->i_mapping, start, orig_end, WB_SYNC_ALL);
+        filemap_fdatawrite_range(inode->i_mapping, start, orig_end);
 
         /* The compression code will leave pages locked but return from
          * writepage without setting the page writeback.  Starting again
          * with WB_SYNC_ALL will end up waiting for the IO to actually start.
          */
-        btrfs_fdatawrite_range(inode->i_mapping, start, orig_end, WB_SYNC_ALL);
+        filemap_fdatawrite_range(inode->i_mapping, start, orig_end);
 
-        btrfs_wait_on_page_writeback_range(inode->i_mapping,
-                                           start >> PAGE_CACHE_SHIFT,
-                                           orig_end >> PAGE_CACHE_SHIFT);
+        filemap_fdatawait_range(inode->i_mapping, start, orig_end);
 
         end = orig_end;
+        found = 0;
         while (1) {
                 ordered = btrfs_lookup_first_ordered_extent(inode, end);
                 if (!ordered)
@@ -514,6 +512,7 @@ again:
                         btrfs_put_ordered_extent(ordered);
                         break;
                 }
+                found++;
                 btrfs_start_ordered_extent(inode, ordered, 1);
                 end = ordered->file_offset;
                 btrfs_put_ordered_extent(ordered);
@@ -521,8 +520,8 @@ again:
                         break;
                 end--;
         }
-        if (test_range_bit(&BTRFS_I(inode)->io_tree, start, orig_end,
-                           EXTENT_ORDERED | EXTENT_DELALLOC, 0)) {
+        if (found || test_range_bit(&BTRFS_I(inode)->io_tree, start, orig_end,
+                           EXTENT_DELALLOC, 0, NULL)) {
                 schedule_timeout(1);
                 goto again;
         }
@@ -613,7 +612,7 @@ int btrfs_ordered_update_i_size(struct inode *inode,
          */
         if (test_range_bit(io_tree, disk_i_size,
                            ordered->file_offset + ordered->len - 1,
-                           EXTENT_DELALLOC, 0)) {
+                           EXTENT_DELALLOC, 0, NULL)) {
                 goto out;
         }
         /*
@@ -664,7 +663,7 @@ int btrfs_ordered_update_i_size(struct inode *inode,
          */
         if (i_size_test > entry_end(ordered) &&
             !test_range_bit(io_tree, entry_end(ordered), i_size_test - 1,
-                           EXTENT_DELALLOC, 0)) {
+                           EXTENT_DELALLOC, 0, NULL)) {
                 new_i_size = min_t(u64, i_size_test, i_size_read(inode));
         }
         BTRFS_I(inode)->disk_i_size = new_i_size;
@@ -715,89 +714,6 @@ out:
 }
 
 
-/**
- * taken from mm/filemap.c because it isn't exported
- *
- * __filemap_fdatawrite_range - start writeback on mapping dirty pages in range
- * @mapping:    address space structure to write
- * @start:      offset in bytes where the range starts
- * @end:        offset in bytes where the range ends (inclusive)
- * @sync_mode:  enable synchronous operation
- *
- * Start writeback against all of a mapping's dirty pages that lie
- * within the byte offsets <start, end> inclusive.
- *
- * If sync_mode is WB_SYNC_ALL then this is a "data integrity" operation, as
- * opposed to a regular memory cleansing writeback.  The difference between
- * these two operations is that if a dirty page/buffer is encountered, it must
- * be waited upon, and not just skipped over.
- */
-int btrfs_fdatawrite_range(struct address_space *mapping, loff_t start,
-                           loff_t end, int sync_mode)
-{
-        struct writeback_control wbc = {
-                .sync_mode = sync_mode,
-                .nr_to_write = mapping->nrpages * 2,
-                .range_start = start,
-                .range_end = end,
-        };
-        return btrfs_writepages(mapping, &wbc);
-}
-
-/**
- * taken from mm/filemap.c because it isn't exported
- *
- * wait_on_page_writeback_range - wait for writeback to complete
- * @mapping:    target address_space
- * @start:      beginning page index
- * @end:        ending page index
- *
- * Wait for writeback to complete against pages indexed by start->end
- * inclusive
- */
-int btrfs_wait_on_page_writeback_range(struct address_space *mapping,
-                                       pgoff_t start, pgoff_t end)
-{
-        struct pagevec pvec;
-        int nr_pages;
-        int ret = 0;
-        pgoff_t index;
-
-        if (end < start)
-                return 0;
-
-        pagevec_init(&pvec, 0);
-        index = start;
-        while ((index <= end) &&
-                        (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
-                        PAGECACHE_TAG_WRITEBACK,
-                        min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1)) != 0) {
-                unsigned i;
-
-                for (i = 0; i < nr_pages; i++) {
-                        struct page *page = pvec.pages[i];
-
-                        /* until radix tree lookup accepts end_index */
-                        if (page->index > end)
-                                continue;
-
-                        wait_on_page_writeback(page);
-                        if (PageError(page))
-                                ret = -EIO;
-                }
-                pagevec_release(&pvec);
-                cond_resched();
-        }
-
-        /* Check for outstanding write errors */
-        if (test_and_clear_bit(AS_ENOSPC, &mapping->flags))
-                ret = -ENOSPC;
-        if (test_and_clear_bit(AS_EIO, &mapping->flags))
-                ret = -EIO;
-
-        return ret;
-}
-
 /*
  * add a given inode to the list of inodes that must be fully on
  * disk before a transaction commit finishes.
diff --git a/fs/btrfs/ordered-data.h b/fs/btrfs/ordered-data.h
index 3d31c8827b01..f82e87488ca8 100644
--- a/fs/btrfs/ordered-data.h
+++ b/fs/btrfs/ordered-data.h
@@ -85,6 +85,9 @@ struct btrfs_ordered_extent {
         /* extent length on disk */
         u64 disk_len;
 
+        /* number of bytes that still need writing */
+        u64 bytes_left;
+
         /* flags (described above) */
         unsigned long flags;
 
@@ -150,10 +153,6 @@ btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset);
 int btrfs_ordered_update_i_size(struct inode *inode,
                                 struct btrfs_ordered_extent *ordered);
 int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr, u32 *sum);
-int btrfs_wait_on_page_writeback_range(struct address_space *mapping,
-                                       pgoff_t start, pgoff_t end);
-int btrfs_fdatawrite_range(struct address_space *mapping, loff_t start,
-                           loff_t end, int sync_mode);
 int btrfs_wait_ordered_extents(struct btrfs_root *root, int nocow_only);
 int btrfs_run_ordered_operations(struct btrfs_root *root, int wait);
 int btrfs_add_ordered_operation(struct btrfs_trans_handle *trans,
diff --git a/fs/btrfs/orphan.c b/fs/btrfs/orphan.c
index 3c0d52af4f80..79cba5fbc28e 100644
--- a/fs/btrfs/orphan.c
+++ b/fs/btrfs/orphan.c
@@ -65,3 +65,23 @@ out:
         btrfs_free_path(path);
         return ret;
 }
+
+int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset)
+{
+        struct btrfs_path *path;
+        struct btrfs_key key;
+        int ret;
+
+        key.objectid = BTRFS_ORPHAN_OBJECTID;
+        key.type = BTRFS_ORPHAN_ITEM_KEY;
+        key.offset = offset;
+
+        path = btrfs_alloc_path();
+        if (!path)
+                return -ENOMEM;
+
+        ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+
+        btrfs_free_path(path);
+        return ret;
+}
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index c04f7f212602..361ad323faac 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -121,6 +121,15 @@ struct inodevec {
         int nr;
 };
 
+#define MAX_EXTENTS 128
+
+struct file_extent_cluster {
+        u64 start;
+        u64 end;
+        u64 boundary[MAX_EXTENTS];
+        unsigned int nr;
+};
+
 struct reloc_control {
         /* block group to relocate */
         struct btrfs_block_group_cache *block_group;
@@ -2180,7 +2189,7 @@ static int tree_block_processed(u64 bytenr, u32 blocksize,
                                 struct reloc_control *rc)
 {
         if (test_range_bit(&rc->processed_blocks, bytenr,
-                           bytenr + blocksize - 1, EXTENT_DIRTY, 1))
+                           bytenr + blocksize - 1, EXTENT_DIRTY, 1, NULL))
                 return 1;
         return 0;
 }
@@ -2529,56 +2538,94 @@ out:
 }
 
 static noinline_for_stack
-int relocate_inode_pages(struct inode *inode, u64 start, u64 len)
+int setup_extent_mapping(struct inode *inode, u64 start, u64 end,
+                         u64 block_start)
+{
+        struct btrfs_root *root = BTRFS_I(inode)->root;
+        struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
+        struct extent_map *em;
+        int ret = 0;
+
+        em = alloc_extent_map(GFP_NOFS);
+        if (!em)
+                return -ENOMEM;
+
+        em->start = start;
+        em->len = end + 1 - start;
+        em->block_len = em->len;
+        em->block_start = block_start;
+        em->bdev = root->fs_info->fs_devices->latest_bdev;
+        set_bit(EXTENT_FLAG_PINNED, &em->flags);
+
+        lock_extent(&BTRFS_I(inode)->io_tree, start, end, GFP_NOFS);
+        while (1) {
+                write_lock(&em_tree->lock);
+                ret = add_extent_mapping(em_tree, em);
+                write_unlock(&em_tree->lock);
+                if (ret != -EEXIST) {
+                        free_extent_map(em);
+                        break;
+                }
+                btrfs_drop_extent_cache(inode, start, end, 0);
+        }
+        unlock_extent(&BTRFS_I(inode)->io_tree, start, end, GFP_NOFS);
+        return ret;
+}
+
+static int relocate_file_extent_cluster(struct inode *inode,
+                                        struct file_extent_cluster *cluster)
 {
         u64 page_start;
         u64 page_end;
-        unsigned long i;
-        unsigned long first_index;
+        u64 offset = BTRFS_I(inode)->index_cnt;
+        unsigned long index;
         unsigned long last_index;
-        unsigned int total_read = 0;
-        unsigned int total_dirty = 0;
+        unsigned int dirty_page = 0;
         struct page *page;
         struct file_ra_state *ra;
-        struct btrfs_ordered_extent *ordered;
-        struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
+        int nr = 0;
         int ret = 0;
 
+        if (!cluster->nr)
+                return 0;
+
         ra = kzalloc(sizeof(*ra), GFP_NOFS);
         if (!ra)
                 return -ENOMEM;
 
+        index = (cluster->start - offset) >> PAGE_CACHE_SHIFT;
+        last_index = (cluster->end - offset) >> PAGE_CACHE_SHIFT;
+
         mutex_lock(&inode->i_mutex);
-        first_index = start >> PAGE_CACHE_SHIFT;
-        last_index = (start + len - 1) >> PAGE_CACHE_SHIFT;
 
-        /* make sure the dirty trick played by the caller work */
-        while (1) {
-                ret = invalidate_inode_pages2_range(inode->i_mapping,
-                                                    first_index, last_index);
-                if (ret != -EBUSY)
-                        break;
-                schedule_timeout(HZ/10);
-        }
+        i_size_write(inode, cluster->end + 1 - offset);
+        ret = setup_extent_mapping(inode, cluster->start - offset,
+                                   cluster->end - offset, cluster->start);
         if (ret)
                 goto out_unlock;
 
         file_ra_state_init(ra, inode->i_mapping);
 
-        for (i = first_index ; i <= last_index; i++) {
-                if (total_read % ra->ra_pages == 0) {
-                        btrfs_force_ra(inode->i_mapping, ra, NULL, i,
-                                min(last_index, ra->ra_pages + i - 1));
-                }
-                total_read++;
-again:
-                if (((u64)i << PAGE_CACHE_SHIFT) > i_size_read(inode))
-                        BUG_ON(1);
-                page = grab_cache_page(inode->i_mapping, i);
+        WARN_ON(cluster->start != cluster->boundary[0]);
+        while (index <= last_index) {
+                page = find_lock_page(inode->i_mapping, index);
                 if (!page) {
-                        ret = -ENOMEM;
-                        goto out_unlock;
+                        page_cache_sync_readahead(inode->i_mapping,
+                                                  ra, NULL, index,
+                                                  last_index + 1 - index);
+                        page = grab_cache_page(inode->i_mapping, index);
+                        if (!page) {
+                                ret = -ENOMEM;
+                                goto out_unlock;
+                        }
+                }
+
+                if (PageReadahead(page)) {
+                        page_cache_async_readahead(inode->i_mapping,
+                                                   ra, NULL, page, index,
+                                                   last_index + 1 - index);
                 }
+
                 if (!PageUptodate(page)) {
                         btrfs_readpage(NULL, page);
                         lock_page(page);
@@ -2589,75 +2636,79 @@ again:
                                 goto out_unlock;
                         }
                 }
-                wait_on_page_writeback(page);
 
                 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
                 page_end = page_start + PAGE_CACHE_SIZE - 1;
-                lock_extent(io_tree, page_start, page_end, GFP_NOFS);
-
-                ordered = btrfs_lookup_ordered_extent(inode, page_start);
-                if (ordered) {
-                        unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
-                        unlock_page(page);
-                        page_cache_release(page);
-                        btrfs_start_ordered_extent(inode, ordered, 1);
-                        btrfs_put_ordered_extent(ordered);
-                        goto again;
-                }
+
+                lock_extent(&BTRFS_I(inode)->io_tree,
+                            page_start, page_end, GFP_NOFS);
+
                 set_page_extent_mapped(page);
 
-                if (i == first_index)
-                        set_extent_bits(io_tree, page_start, page_end,
+                if (nr < cluster->nr &&
+                    page_start + offset == cluster->boundary[nr]) {
+                        set_extent_bits(&BTRFS_I(inode)->io_tree,
+                                        page_start, page_end,
                                         EXTENT_BOUNDARY, GFP_NOFS);
+                        nr++;
+                }
                 btrfs_set_extent_delalloc(inode, page_start, page_end);
 
                 set_page_dirty(page);
-                total_dirty++;
+                dirty_page++;
 
-                unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
+                unlock_extent(&BTRFS_I(inode)->io_tree,
+                              page_start, page_end, GFP_NOFS);
                 unlock_page(page);
                 page_cache_release(page);
+
+                index++;
+                if (nr < cluster->nr &&
+                    page_end + 1 + offset == cluster->boundary[nr]) {
+                        balance_dirty_pages_ratelimited_nr(inode->i_mapping,
+                                                           dirty_page);
+                        dirty_page = 0;
+                }
+        }
+        if (dirty_page) {
+                balance_dirty_pages_ratelimited_nr(inode->i_mapping,
+                                                   dirty_page);
         }
+        WARN_ON(nr != cluster->nr);
 out_unlock:
         mutex_unlock(&inode->i_mutex);
         kfree(ra);
-        balance_dirty_pages_ratelimited_nr(inode->i_mapping, total_dirty);
         return ret;
 }
 
 static noinline_for_stack
-int relocate_data_extent(struct inode *inode, struct btrfs_key *extent_key)
+int relocate_data_extent(struct inode *inode, struct btrfs_key *extent_key,
+                         struct file_extent_cluster *cluster)
 {
-        struct btrfs_root *root = BTRFS_I(inode)->root;
-        struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
-        struct extent_map *em;
-        u64 start = extent_key->objectid - BTRFS_I(inode)->index_cnt;
-        u64 end = start + extent_key->offset - 1;
-
-        em = alloc_extent_map(GFP_NOFS);
-        em->start = start;
-        em->len = extent_key->offset;
-        em->block_len = extent_key->offset;
-        em->block_start = extent_key->objectid;
-        em->bdev = root->fs_info->fs_devices->latest_bdev;
-        set_bit(EXTENT_FLAG_PINNED, &em->flags);
+        int ret;
 
-        /* setup extent map to cheat btrfs_readpage */
-        lock_extent(&BTRFS_I(inode)->io_tree, start, end, GFP_NOFS);
-        while (1) {
-                int ret;
-                spin_lock(&em_tree->lock);
-                ret = add_extent_mapping(em_tree, em);
-                spin_unlock(&em_tree->lock);
-                if (ret != -EEXIST) {
-                        free_extent_map(em);
-                        break;
-                }
-                btrfs_drop_extent_cache(inode, start, end, 0);
+        if (cluster->nr > 0 && extent_key->objectid != cluster->end + 1) {
+                ret = relocate_file_extent_cluster(inode, cluster);
+                if (ret)
+                        return ret;
+                cluster->nr = 0;
         }
-        unlock_extent(&BTRFS_I(inode)->io_tree, start, end, GFP_NOFS);
 
-        return relocate_inode_pages(inode, start, extent_key->offset);
+        if (!cluster->nr)
+                cluster->start = extent_key->objectid;
+        else
+                BUG_ON(cluster->nr >= MAX_EXTENTS);
+        cluster->end = extent_key->objectid + extent_key->offset - 1;
+        cluster->boundary[cluster->nr] = extent_key->objectid;
+        cluster->nr++;
+
+        if (cluster->nr >= MAX_EXTENTS) {
+                ret = relocate_file_extent_cluster(inode, cluster);
+                if (ret)
+                        return ret;
+                cluster->nr = 0;
+        }
+        return 0;
 }
 
 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
@@ -3203,10 +3254,12 @@ static int check_extent_flags(u64 flags)
         return 0;
 }
 
+
 static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
 {
         struct rb_root blocks = RB_ROOT;
         struct btrfs_key key;
+        struct file_extent_cluster *cluster;
         struct btrfs_trans_handle *trans = NULL;
         struct btrfs_path *path;
         struct btrfs_extent_item *ei;
@@ -3216,10 +3269,17 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
         int ret;
         int err = 0;
 
+        cluster = kzalloc(sizeof(*cluster), GFP_NOFS);
+        if (!cluster)
+                return -ENOMEM;
+
         path = btrfs_alloc_path();
         if (!path)
                 return -ENOMEM;
 
+        rc->extents_found = 0;
+        rc->extents_skipped = 0;
+
         rc->search_start = rc->block_group->key.objectid;
         clear_extent_bits(&rc->processed_blocks, 0, (u64)-1, EXTENT_DIRTY,
                           GFP_NOFS);
@@ -3306,14 +3366,15 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
                 }
 
                 nr = trans->blocks_used;
-                btrfs_end_transaction_throttle(trans, rc->extent_root);
+                btrfs_end_transaction(trans, rc->extent_root);
                 trans = NULL;
                 btrfs_btree_balance_dirty(rc->extent_root, nr);
 
                 if (rc->stage == MOVE_DATA_EXTENTS &&
                     (flags & BTRFS_EXTENT_FLAG_DATA)) {
                         rc->found_file_extent = 1;
-                        ret = relocate_data_extent(rc->data_inode, &key);
+                        ret = relocate_data_extent(rc->data_inode,
+                                                   &key, cluster);
                         if (ret < 0) {
                                 err = ret;
                                 break;
@@ -3328,6 +3389,14 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
                 btrfs_btree_balance_dirty(rc->extent_root, nr);
         }
 
+        if (!err) {
+                ret = relocate_file_extent_cluster(rc->data_inode, cluster);
+                if (ret < 0)
+                        err = ret;
+        }
+
+        kfree(cluster);
+
         rc->create_reloc_root = 0;
         smp_mb();
 
@@ -3348,8 +3417,7 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
 }
 
 static int __insert_orphan_inode(struct btrfs_trans_handle *trans,
-                                 struct btrfs_root *root,
-                                 u64 objectid, u64 size)
+                                 struct btrfs_root *root, u64 objectid)
 {
         struct btrfs_path *path;
         struct btrfs_inode_item *item;
@@ -3368,7 +3436,7 @@ static int __insert_orphan_inode(struct btrfs_trans_handle *trans,
         item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item);
         memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item));
         btrfs_set_inode_generation(leaf, item, 1);
-        btrfs_set_inode_size(leaf, item, size);
+        btrfs_set_inode_size(leaf, item, 0);
         btrfs_set_inode_mode(leaf, item, S_IFREG | 0600);
         btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NOCOMPRESS);
         btrfs_mark_buffer_dirty(leaf);
@@ -3404,12 +3472,7 @@ static struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info,
         if (err)
                 goto out;
 
-        err = __insert_orphan_inode(trans, root, objectid, group->key.offset);
-        BUG_ON(err);
-
-        err = btrfs_insert_file_extent(trans, root, objectid, 0, 0, 0,
-                                       group->key.offset, 0, group->key.offset,
-                                       0, 0, 0);
+        err = __insert_orphan_inode(trans, root, objectid);
         BUG_ON(err);
 
         key.objectid = objectid;
@@ -3475,14 +3538,15 @@ int btrfs_relocate_block_group(struct btrfs_root *extent_root, u64 group_start)
         btrfs_wait_ordered_extents(fs_info->tree_root, 0);
 
         while (1) {
-                mutex_lock(&fs_info->cleaner_mutex);
-                btrfs_clean_old_snapshots(fs_info->tree_root);
-                mutex_unlock(&fs_info->cleaner_mutex);
-
                 rc->extents_found = 0;
                 rc->extents_skipped = 0;
 
+                mutex_lock(&fs_info->cleaner_mutex);
+
+                btrfs_clean_old_snapshots(fs_info->tree_root);
                 ret = relocate_block_group(rc);
+
+                mutex_unlock(&fs_info->cleaner_mutex);
                 if (ret < 0) {
                         err = ret;
                         break;
@@ -3514,10 +3578,10 @@ int btrfs_relocate_block_group(struct btrfs_root *extent_root, u64 group_start)
                 }
         }
 
-        filemap_fdatawrite_range(fs_info->btree_inode->i_mapping,
-                                 rc->block_group->key.objectid,
-                                 rc->block_group->key.objectid +
-                                 rc->block_group->key.offset - 1);
+        filemap_write_and_wait_range(fs_info->btree_inode->i_mapping,
+                                     rc->block_group->key.objectid,
+                                     rc->block_group->key.objectid +
+                                     rc->block_group->key.offset - 1);
 
         WARN_ON(rc->block_group->pinned > 0);
         WARN_ON(rc->block_group->reserved > 0);
@@ -3530,6 +3594,26 @@ out:
         return err;
 }
 
+static noinline_for_stack int mark_garbage_root(struct btrfs_root *root)
+{
+        struct btrfs_trans_handle *trans;
+        int ret;
+
+        trans = btrfs_start_transaction(root->fs_info->tree_root, 1);
+
+        memset(&root->root_item.drop_progress, 0,
+                sizeof(root->root_item.drop_progress));
+        root->root_item.drop_level = 0;
+        btrfs_set_root_refs(&root->root_item, 0);
+        ret = btrfs_update_root(trans, root->fs_info->tree_root,
+                                &root->root_key, &root->root_item);
+        BUG_ON(ret);
+
+        ret = btrfs_end_transaction(trans, root->fs_info->tree_root);
+        BUG_ON(ret);
+        return 0;
+}
+
 /*
  * recover relocation interrupted by system crash.
  *
@@ -3589,8 +3673,12 @@ int btrfs_recover_relocation(struct btrfs_root *root)
                         fs_root = read_fs_root(root->fs_info,
                                                reloc_root->root_key.offset);
                         if (IS_ERR(fs_root)) {
-                                err = PTR_ERR(fs_root);
-                                goto out;
+                                ret = PTR_ERR(fs_root);
+                                if (ret != -ENOENT) {
+                                        err = ret;
+                                        goto out;
+                                }
+                                mark_garbage_root(reloc_root);
                         }
                 }
 
diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c
index 0ddc6d61c55a..9351428f30e2 100644
--- a/fs/btrfs/root-tree.c
+++ b/fs/btrfs/root-tree.c
@@ -94,17 +94,23 @@ int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
                 goto out;
 
         BUG_ON(ret == 0);
+        if (path->slots[0] == 0) {
+                ret = 1;
+                goto out;
+        }
         l = path->nodes[0];
-        BUG_ON(path->slots[0] == 0);
         slot = path->slots[0] - 1;
         btrfs_item_key_to_cpu(l, &found_key, slot);
-        if (found_key.objectid != objectid) {
+        if (found_key.objectid != objectid ||
+            found_key.type != BTRFS_ROOT_ITEM_KEY) {
                 ret = 1;
                 goto out;
         }
-        read_extent_buffer(l, item, btrfs_item_ptr_offset(l, slot),
-                           sizeof(*item));
-        memcpy(key, &found_key, sizeof(found_key));
+        if (item)
+                read_extent_buffer(l, item, btrfs_item_ptr_offset(l, slot),
+                                   sizeof(*item));
+        if (key)
+                memcpy(key, &found_key, sizeof(found_key));
         ret = 0;
 out:
         btrfs_free_path(path);
@@ -249,6 +255,59 @@ err:
         return ret;
 }
 
+int btrfs_find_orphan_roots(struct btrfs_root *tree_root)
+{
+        struct extent_buffer *leaf;
+        struct btrfs_path *path;
+        struct btrfs_key key;
+        int err = 0;
+        int ret;
+
+        path = btrfs_alloc_path();
+        if (!path)
+                return -ENOMEM;
+
+        key.objectid = BTRFS_ORPHAN_OBJECTID;
+        key.type = BTRFS_ORPHAN_ITEM_KEY;
+        key.offset = 0;
+
+        while (1) {
+                ret = btrfs_search_slot(NULL, tree_root, &key, path, 0, 0);
+                if (ret < 0) {
+                        err = ret;
+                        break;
+                }
+
+                leaf = path->nodes[0];
+                if (path->slots[0] >= btrfs_header_nritems(leaf)) {
+                        ret = btrfs_next_leaf(tree_root, path);
+                        if (ret < 0)
+                                err = ret;
+                        if (ret != 0)
+                                break;
+                        leaf = path->nodes[0];
+                }
+
+                btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
+                btrfs_release_path(tree_root, path);
+
+                if (key.objectid != BTRFS_ORPHAN_OBJECTID ||
+                    key.type != BTRFS_ORPHAN_ITEM_KEY)
+                        break;
+
+                ret = btrfs_find_dead_roots(tree_root, key.offset);
+                if (ret) {
+                        err = ret;
+                        break;
+                }
+
+                key.offset++;
+        }
+
+        btrfs_free_path(path);
+        return err;
+}
+
 /* drop the root item for 'key' from 'root' */
 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
                    struct btrfs_key *key)
@@ -278,31 +337,57 @@ out:
         return ret;
 }
 
-#if 0 /* this will get used when snapshot deletion is implemented */
 int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
                        struct btrfs_root *tree_root,
-                       u64 root_id, u8 type, u64 ref_id)
+                       u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
+                       const char *name, int name_len)
+
 {
+        struct btrfs_path *path;
+        struct btrfs_root_ref *ref;
+        struct extent_buffer *leaf;
         struct btrfs_key key;
+        unsigned long ptr;
+        int err = 0;
         int ret;
-        struct btrfs_path *path;
 
         path = btrfs_alloc_path();
+        if (!path)
+                return -ENOMEM;
 
         key.objectid = root_id;
-        key.type = type;
+        key.type = BTRFS_ROOT_BACKREF_KEY;
         key.offset = ref_id;
-
+again:
         ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1);
-        BUG_ON(ret);
-
-        ret = btrfs_del_item(trans, tree_root, path);
-        BUG_ON(ret);
+        BUG_ON(ret < 0);
+        if (ret == 0) {
+                leaf = path->nodes[0];
+                ref = btrfs_item_ptr(leaf, path->slots[0],
+                                     struct btrfs_root_ref);
+
+                WARN_ON(btrfs_root_ref_dirid(leaf, ref) != dirid);
+                WARN_ON(btrfs_root_ref_name_len(leaf, ref) != name_len);
+                ptr = (unsigned long)(ref + 1);
+                WARN_ON(memcmp_extent_buffer(leaf, name, ptr, name_len));
+                *sequence = btrfs_root_ref_sequence(leaf, ref);
+
+                ret = btrfs_del_item(trans, tree_root, path);
+                BUG_ON(ret);
+        } else
+                err = -ENOENT;
+
+        if (key.type == BTRFS_ROOT_BACKREF_KEY) {
+                btrfs_release_path(tree_root, path);
+                key.objectid = ref_id;
+                key.type = BTRFS_ROOT_REF_KEY;
+                key.offset = root_id;
+                goto again;
+        }
 
         btrfs_free_path(path);
-        return ret;
+        return err;
 }
-#endif
 
 int btrfs_find_root_ref(struct btrfs_root *tree_root,
                    struct btrfs_path *path,
@@ -319,7 +404,6 @@ int btrfs_find_root_ref(struct btrfs_root *tree_root,
         return ret;
 }
 
-
 /*
  * add a btrfs_root_ref item.  type is either BTRFS_ROOT_REF_KEY
  * or BTRFS_ROOT_BACKREF_KEY.
@@ -335,8 +419,7 @@ int btrfs_find_root_ref(struct btrfs_root *tree_root,
  */
 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
                        struct btrfs_root *tree_root,
-                       u64 root_id, u8 type, u64 ref_id,
-                       u64 dirid, u64 sequence,
+                       u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
                        const char *name, int name_len)
 {
         struct btrfs_key key;
@@ -346,13 +429,14 @@ int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
         struct extent_buffer *leaf;
         unsigned long ptr;
 
-
         path = btrfs_alloc_path();
+        if (!path)
+                return -ENOMEM;
 
         key.objectid = root_id;
-        key.type = type;
+        key.type = BTRFS_ROOT_BACKREF_KEY;
         key.offset = ref_id;
-
+again:
         ret = btrfs_insert_empty_item(trans, tree_root, path, &key,
                                       sizeof(*ref) + name_len);
         BUG_ON(ret);
@@ -366,6 +450,14 @@ int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
         write_extent_buffer(leaf, name, ptr, name_len);
         btrfs_mark_buffer_dirty(leaf);
 
+        if (key.type == BTRFS_ROOT_BACKREF_KEY) {
+                btrfs_release_path(tree_root, path);
+                key.objectid = ref_id;
+                key.type = BTRFS_ROOT_REF_KEY;
+                key.offset = root_id;
+                goto again;
+        }
+
         btrfs_free_path(path);
-        return ret;
+        return 0;
 }
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 6d6d06cb6dfc..9de9b2236419 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -51,7 +51,7 @@
 #include "export.h"
 #include "compression.h"
 
-static struct super_operations btrfs_super_ops;
+static const struct super_operations btrfs_super_ops;
 
 static void btrfs_put_super(struct super_block *sb)
 {
@@ -344,7 +344,9 @@ static int btrfs_fill_super(struct super_block *sb,
         sb->s_export_op = &btrfs_export_ops;
         sb->s_xattr = btrfs_xattr_handlers;
         sb->s_time_gran = 1;
+#ifdef CONFIG_BTRFS_POSIX_ACL
         sb->s_flags |= MS_POSIXACL;
+#endif
 
         tree_root = open_ctree(sb, fs_devices, (char *)data);
 
@@ -675,7 +677,8 @@ static int btrfs_unfreeze(struct super_block *sb)
         return 0;
 }
 
-static struct super_operations btrfs_super_ops = {
+static const struct super_operations btrfs_super_ops = {
+        .drop_inode     = btrfs_drop_inode,
         .delete_inode   = btrfs_delete_inode,
         .put_super      = btrfs_put_super,
         .sync_fs        = btrfs_sync_fs,
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index cdbb5022da52..0b8f36d4400a 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -104,7 +104,6 @@ static noinline int record_root_in_trans(struct btrfs_trans_handle *trans,
 {
         if (root->ref_cows && root->last_trans < trans->transid) {
                 WARN_ON(root == root->fs_info->extent_root);
-                WARN_ON(root->root_item.refs == 0);
                 WARN_ON(root->commit_root != root->node);
 
                 radix_tree_tag_set(&root->fs_info->fs_roots_radix,
@@ -187,6 +186,9 @@ static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root,
         h->alloc_exclude_start = 0;
         h->delayed_ref_updates = 0;
 
+        if (!current->journal_info)
+                current->journal_info = h;
+
         root->fs_info->running_transaction->use_count++;
         record_root_in_trans(h, root);
         mutex_unlock(&root->fs_info->trans_mutex);
@@ -318,6 +320,9 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
                 wake_up(&cur_trans->writer_wait);
         put_transaction(cur_trans);
         mutex_unlock(&info->trans_mutex);
+
+        if (current->journal_info == trans)
+                current->journal_info = NULL;
         memset(trans, 0, sizeof(*trans));
         kmem_cache_free(btrfs_trans_handle_cachep, trans);
 
@@ -720,7 +725,8 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
         memcpy(new_root_item, &root->root_item, sizeof(*new_root_item));
 
         key.objectid = objectid;
-        key.offset = 0;
+        /* record when the snapshot was created in key.offset */
+        key.offset = trans->transid;
         btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
 
         old = btrfs_lock_root_node(root);
@@ -743,6 +749,7 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
         memcpy(&pending->root_key, &key, sizeof(key));
 fail:
         kfree(new_root_item);
+        btrfs_unreserve_metadata_space(root, 6);
         return ret;
 }
 
@@ -778,24 +785,14 @@ static noinline int finish_pending_snapshot(struct btrfs_fs_info *fs_info,
         ret = btrfs_update_inode(trans, parent_root, parent_inode);
         BUG_ON(ret);
 
-        /* add the backref first */
         ret = btrfs_add_root_ref(trans, parent_root->fs_info->tree_root,
                                  pending->root_key.objectid,
-                                 BTRFS_ROOT_BACKREF_KEY,
                                  parent_root->root_key.objectid,
                                  parent_inode->i_ino, index, pending->name,
                                  namelen);
 
         BUG_ON(ret);
 
-        /* now add the forward ref */
-        ret = btrfs_add_root_ref(trans, parent_root->fs_info->tree_root,
-                                 parent_root->root_key.objectid,
-                                 BTRFS_ROOT_REF_KEY,
-                                 pending->root_key.objectid,
-                                 parent_inode->i_ino, index, pending->name,
-                                 namelen);
-
         inode = btrfs_lookup_dentry(parent_inode, pending->dentry);
         d_instantiate(pending->dentry, inode);
 fail:
@@ -874,7 +871,6 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
         unsigned long timeout = 1;
         struct btrfs_transaction *cur_trans;
         struct btrfs_transaction *prev_trans = NULL;
-        struct extent_io_tree *pinned_copy;
         DEFINE_WAIT(wait);
         int ret;
         int should_grow = 0;
@@ -915,13 +911,6 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
                 return 0;
         }
 
-        pinned_copy = kmalloc(sizeof(*pinned_copy), GFP_NOFS);
-        if (!pinned_copy)
-                return -ENOMEM;
-
-        extent_io_tree_init(pinned_copy,
-                             root->fs_info->btree_inode->i_mapping, GFP_NOFS);
-
         trans->transaction->in_commit = 1;
         trans->transaction->blocked = 1;
         if (cur_trans->list.prev != &root->fs_info->trans_list) {
@@ -1019,6 +1008,8 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
         ret = commit_cowonly_roots(trans, root);
         BUG_ON(ret);
 
+        btrfs_prepare_extent_commit(trans, root);
+
         cur_trans = root->fs_info->running_transaction;
         spin_lock(&root->fs_info->new_trans_lock);
         root->fs_info->running_transaction = NULL;
@@ -1042,8 +1033,6 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
         memcpy(&root->fs_info->super_for_commit, &root->fs_info->super_copy,
                sizeof(root->fs_info->super_copy));
 
-        btrfs_copy_pinned(root, pinned_copy);
-
         trans->transaction->blocked = 0;
 
         wake_up(&root->fs_info->transaction_wait);
@@ -1059,8 +1048,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
          */
         mutex_unlock(&root->fs_info->tree_log_mutex);
 
-        btrfs_finish_extent_commit(trans, root, pinned_copy);
-        kfree(pinned_copy);
+        btrfs_finish_extent_commit(trans, root);
 
         /* do the directory inserts of any pending snapshot creations */
         finish_pending_snapshots(trans, root->fs_info);
@@ -1078,6 +1066,9 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 
         mutex_unlock(&root->fs_info->trans_mutex);
 
+        if (current->journal_info == trans)
+                current->journal_info = NULL;
+
         kmem_cache_free(btrfs_trans_handle_cachep, trans);
         return ret;
 }
@@ -1096,8 +1087,13 @@ int btrfs_clean_old_snapshots(struct btrfs_root *root)
 
         while (!list_empty(&list)) {
                 root = list_entry(list.next, struct btrfs_root, root_list);
-                list_del_init(&root->root_list);
-                btrfs_drop_snapshot(root, 0);
+                list_del(&root->root_list);
+
+                if (btrfs_header_backref_rev(root->node) <
+                    BTRFS_MIXED_BACKREF_REV)
+                        btrfs_drop_snapshot(root, 0);
+                else
+                        btrfs_drop_snapshot(root, 1);
         }
         return 0;
 }
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index d91b0de7c502..7827841b55cb 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -263,8 +263,8 @@ static int process_one_buffer(struct btrfs_root *log,
                               struct walk_control *wc, u64 gen)
 {
         if (wc->pin)
-                btrfs_update_pinned_extents(log->fs_info->extent_root,
-                                            eb->start, eb->len, 1);
+                btrfs_pin_extent(log->fs_info->extent_root,
+                                 eb->start, eb->len, 0);
 
         if (btrfs_buffer_uptodate(eb, gen)) {
                 if (wc->write)
@@ -534,7 +534,7 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans,
         saved_nbytes = inode_get_bytes(inode);
         /* drop any overlapping extents */
         ret = btrfs_drop_extents(trans, root, inode,
-                         start, extent_end, extent_end, start, &alloc_hint);
+                         start, extent_end, extent_end, start, &alloc_hint, 1);
         BUG_ON(ret);
 
         if (found_type == BTRFS_FILE_EXTENT_REG ||
@@ -2605,7 +2605,7 @@ static noinline int copy_items(struct btrfs_trans_handle *trans,
                                                                 extent);
                                 cs = btrfs_file_extent_offset(src, extent);
                                 cl = btrfs_file_extent_num_bytes(src,
-                                                                extent);;
+                                                                extent);
                                 if (btrfs_file_extent_compression(src,
                                                                   extent)) {
                                         cs = 0;
@@ -2841,7 +2841,7 @@ static noinline int check_parent_dirs_for_sync(struct btrfs_trans_handle *trans,
                 if (!parent || !parent->d_inode || sb != parent->d_inode->i_sb)
                         break;
 
-                if (parent == sb->s_root)
+                if (IS_ROOT(parent))
                         break;
 
                 parent = parent->d_parent;
@@ -2880,6 +2880,12 @@ int btrfs_log_inode_parent(struct btrfs_trans_handle *trans,
                 goto end_no_trans;
         }
 
+        if (root != BTRFS_I(inode)->root ||
+            btrfs_root_refs(&root->root_item) == 0) {
+                ret = 1;
+                goto end_no_trans;
+        }
+
         ret = check_parent_dirs_for_sync(trans, inode, parent,
                                          sb, last_committed);
         if (ret)
@@ -2907,12 +2913,15 @@ int btrfs_log_inode_parent(struct btrfs_trans_handle *trans,
                         break;
 
                 inode = parent->d_inode;
+                if (root != BTRFS_I(inode)->root)
+                        break;
+
                 if (BTRFS_I(inode)->generation >
                     root->fs_info->last_trans_committed) {
                         ret = btrfs_log_inode(trans, root, inode, inode_only);
                         BUG_ON(ret);
                 }
-                if (parent == sb->s_root)
+                if (IS_ROOT(parent))
                         break;
 
                 parent = parent->d_parent;
@@ -2951,7 +2960,6 @@ int btrfs_recover_log_trees(struct btrfs_root *log_root_tree)
         struct btrfs_key tmp_key;
         struct btrfs_root *log;
         struct btrfs_fs_info *fs_info = log_root_tree->fs_info;
-        u64 highest_inode;
         struct walk_control wc = {
                 .process_func = process_one_buffer,
                 .stage = 0,
@@ -3010,11 +3018,6 @@ again:
                                                       path);
                         BUG_ON(ret);
                 }
-                ret = btrfs_find_highest_inode(wc.replay_dest, &highest_inode);
-                if (ret == 0) {
-                        wc.replay_dest->highest_inode = highest_inode;
-                        wc.replay_dest->last_inode_alloc = highest_inode;
-                }
 
                 key.offset = found_key.offset - 1;
                 wc.replay_dest->log_root = NULL;
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 5cf405b0828d..7eda483d7b5a 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -276,7 +276,7 @@ loop_lock:
                  * is now congested.  Back off and let other work structs
                  * run instead
                  */
-                if (pending && bdi_write_congested(bdi) && batch_run > 32 &&
+                if (pending && bdi_write_congested(bdi) && batch_run > 8 &&
                     fs_info->fs_devices->open_devices > 1) {
                         struct io_context *ioc;
 
@@ -446,8 +446,10 @@ static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig)
                         goto error;
 
                 device->name = kstrdup(orig_dev->name, GFP_NOFS);
-                if (!device->name)
+                if (!device->name) {
+                        kfree(device);
                         goto error;
+                }
 
                 device->devid = orig_dev->devid;
                 device->work.func = pending_bios_fn;
@@ -719,10 +721,9 @@ error:
  * called very infrequently and that a given device has a small number
  * of extents
  */
-static noinline int find_free_dev_extent(struct btrfs_trans_handle *trans,
-                                         struct btrfs_device *device,
-                                         u64 num_bytes, u64 *start,
-                                         u64 *max_avail)
+int find_free_dev_extent(struct btrfs_trans_handle *trans,
+                         struct btrfs_device *device, u64 num_bytes,
+                         u64 *start, u64 *max_avail)
 {
         struct btrfs_key key;
         struct btrfs_root *root = device->dev_root;
@@ -1736,6 +1737,10 @@ static int btrfs_relocate_chunk(struct btrfs_root *root,
         extent_root = root->fs_info->extent_root;
         em_tree = &root->fs_info->mapping_tree.map_tree;
 
+        ret = btrfs_can_relocate(extent_root, chunk_offset);
+        if (ret)
+                return -ENOSPC;
+
         /* step one, relocate all the extents inside this chunk */
         ret = btrfs_relocate_block_group(extent_root, chunk_offset);
         BUG_ON(ret);
@@ -1749,9 +1754,9 @@ static int btrfs_relocate_chunk(struct btrfs_root *root,
          * step two, delete the device extents and the
          * chunk tree entries
          */
-        spin_lock(&em_tree->lock);
+        read_lock(&em_tree->lock);
         em = lookup_extent_mapping(em_tree, chunk_offset, 1);
-        spin_unlock(&em_tree->lock);
+        read_unlock(&em_tree->lock);
 
         BUG_ON(em->start > chunk_offset ||
                em->start + em->len < chunk_offset);
@@ -1780,9 +1785,9 @@ static int btrfs_relocate_chunk(struct btrfs_root *root,
         ret = btrfs_remove_block_group(trans, extent_root, chunk_offset);
         BUG_ON(ret);
 
-        spin_lock(&em_tree->lock);
+        write_lock(&em_tree->lock);
         remove_extent_mapping(em_tree, em);
-        spin_unlock(&em_tree->lock);
+        write_unlock(&em_tree->lock);
 
         kfree(map);
         em->bdev = NULL;
@@ -1807,12 +1812,15 @@ static int btrfs_relocate_sys_chunks(struct btrfs_root *root)
         struct btrfs_key found_key;
         u64 chunk_tree = chunk_root->root_key.objectid;
         u64 chunk_type;
+        bool retried = false;
+        int failed = 0;
         int ret;
 
         path = btrfs_alloc_path();
         if (!path)
                 return -ENOMEM;
 
+again:
         key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
         key.offset = (u64)-1;
         key.type = BTRFS_CHUNK_ITEM_KEY;
@@ -1842,7 +1850,10 @@ static int btrfs_relocate_sys_chunks(struct btrfs_root *root)
                         ret = btrfs_relocate_chunk(chunk_root, chunk_tree,
                                                    found_key.objectid,
                                                    found_key.offset);
-                        BUG_ON(ret);
+                        if (ret == -ENOSPC)
+                                failed++;
+                        else if (ret)
+                                BUG();
                 }
 
                 if (found_key.offset == 0)
@@ -1850,6 +1861,14 @@ static int btrfs_relocate_sys_chunks(struct btrfs_root *root)
                 key.offset = found_key.offset - 1;
         }
         ret = 0;
+        if (failed && !retried) {
+                failed = 0;
+                retried = true;
+                goto again;
+        } else if (failed && retried) {
+                WARN_ON(1);
+                ret = -ENOSPC;
+        }
 error:
         btrfs_free_path(path);
         return ret;
@@ -1894,6 +1913,8 @@ int btrfs_balance(struct btrfs_root *dev_root)
                         continue;
 
                 ret = btrfs_shrink_device(device, old_size - size_to_free);
+                if (ret == -ENOSPC)
+                        break;
                 BUG_ON(ret);
 
                 trans = btrfs_start_transaction(dev_root, 1);
@@ -1938,9 +1959,8 @@ int btrfs_balance(struct btrfs_root *dev_root)
                 chunk = btrfs_item_ptr(path->nodes[0],
                                        path->slots[0],
                                        struct btrfs_chunk);
-                key.offset = found_key.offset;
                 /* chunk zero is special */
-                if (key.offset == 0)
+                if (found_key.offset == 0)
                         break;
 
                 btrfs_release_path(chunk_root, path);
@@ -1948,7 +1968,8 @@ int btrfs_balance(struct btrfs_root *dev_root)
                                            chunk_root->root_key.objectid,
                                            found_key.objectid,
                                            found_key.offset);
-                BUG_ON(ret);
+                BUG_ON(ret && ret != -ENOSPC);
+                key.offset = found_key.offset - 1;
         }
         ret = 0;
 error:
@@ -1974,10 +1995,13 @@ int btrfs_shrink_device(struct btrfs_device *device, u64 new_size)
         u64 chunk_offset;
         int ret;
         int slot;
+        int failed = 0;
+        bool retried = false;
         struct extent_buffer *l;
         struct btrfs_key key;
         struct btrfs_super_block *super_copy = &root->fs_info->super_copy;
         u64 old_total = btrfs_super_total_bytes(super_copy);
+        u64 old_size = device->total_bytes;
         u64 diff = device->total_bytes - new_size;
 
         if (new_size >= device->total_bytes)
@@ -1987,12 +2011,6 @@ int btrfs_shrink_device(struct btrfs_device *device, u64 new_size)
         if (!path)
                 return -ENOMEM;
 
-        trans = btrfs_start_transaction(root, 1);
-        if (!trans) {
-                ret = -ENOMEM;
-                goto done;
-        }
-
         path->reada = 2;
 
         lock_chunks(root);
@@ -2001,8 +2019,8 @@ int btrfs_shrink_device(struct btrfs_device *device, u64 new_size)
         if (device->writeable)
                 device->fs_devices->total_rw_bytes -= diff;
         unlock_chunks(root);
-        btrfs_end_transaction(trans, root);
 
+again:
         key.objectid = device->devid;
         key.offset = (u64)-1;
         key.type = BTRFS_DEV_EXTENT_KEY;
@@ -2017,6 +2035,7 @@ int btrfs_shrink_device(struct btrfs_device *device, u64 new_size)
                         goto done;
                 if (ret) {
                         ret = 0;
+                        btrfs_release_path(root, path);
                         break;
                 }
 
@@ -2024,14 +2043,18 @@ int btrfs_shrink_device(struct btrfs_device *device, u64 new_size)
                 slot = path->slots[0];
                 btrfs_item_key_to_cpu(l, &key, path->slots[0]);
 
-                if (key.objectid != device->devid)
+                if (key.objectid != device->devid) {
+                        btrfs_release_path(root, path);
                         break;
+                }
 
                 dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent);
                 length = btrfs_dev_extent_length(l, dev_extent);
 
-                if (key.offset + length <= new_size)
+                if (key.offset + length <= new_size) {
+                        btrfs_release_path(root, path);
                         break;
+                }
 
                 chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent);
                 chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent);
@@ -2040,8 +2063,26 @@ int btrfs_shrink_device(struct btrfs_device *device, u64 new_size)
 
                 ret = btrfs_relocate_chunk(root, chunk_tree, chunk_objectid,
                                            chunk_offset);
-                if (ret)
+                if (ret && ret != -ENOSPC)
                         goto done;
+                if (ret == -ENOSPC)
+                        failed++;
+                key.offset -= 1;
+        }
+
+        if (failed && !retried) {
+                failed = 0;
+                retried = true;
+                goto again;
+        } else if (failed && retried) {
+                ret = -ENOSPC;
+                lock_chunks(root);
+
+                device->total_bytes = old_size;
+                if (device->writeable)
+                        device->fs_devices->total_rw_bytes += diff;
+                unlock_chunks(root);
+                goto done;
         }
 
         /* Shrinking succeeded, else we would be at "done". */
@@ -2294,9 +2335,9 @@ again:
         em->block_len = em->len;
 
         em_tree = &extent_root->fs_info->mapping_tree.map_tree;
-        spin_lock(&em_tree->lock);
+        write_lock(&em_tree->lock);
         ret = add_extent_mapping(em_tree, em);
-        spin_unlock(&em_tree->lock);
+        write_unlock(&em_tree->lock);
         BUG_ON(ret);
         free_extent_map(em);
 
@@ -2491,9 +2532,9 @@ int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset)
         int readonly = 0;
         int i;
 
-        spin_lock(&map_tree->map_tree.lock);
+        read_lock(&map_tree->map_tree.lock);
         em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1);
-        spin_unlock(&map_tree->map_tree.lock);
+        read_unlock(&map_tree->map_tree.lock);
         if (!em)
                 return 1;
 
@@ -2518,11 +2559,11 @@ void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree)
         struct extent_map *em;
 
         while (1) {
-                spin_lock(&tree->map_tree.lock);
+                write_lock(&tree->map_tree.lock);
                 em = lookup_extent_mapping(&tree->map_tree, 0, (u64)-1);
                 if (em)
                         remove_extent_mapping(&tree->map_tree, em);
-                spin_unlock(&tree->map_tree.lock);
+                write_unlock(&tree->map_tree.lock);
                 if (!em)
                         break;
                 kfree(em->bdev);
@@ -2540,9 +2581,9 @@ int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len)
         struct extent_map_tree *em_tree = &map_tree->map_tree;
         int ret;
 
-        spin_lock(&em_tree->lock);
+        read_lock(&em_tree->lock);
         em = lookup_extent_mapping(em_tree, logical, len);
-        spin_unlock(&em_tree->lock);
+        read_unlock(&em_tree->lock);
         BUG_ON(!em);
 
         BUG_ON(em->start > logical || em->start + em->len < logical);
@@ -2604,9 +2645,9 @@ again:
                 atomic_set(&multi->error, 0);
         }
 
-        spin_lock(&em_tree->lock);
+        read_lock(&em_tree->lock);
         em = lookup_extent_mapping(em_tree, logical, *length);
-        spin_unlock(&em_tree->lock);
+        read_unlock(&em_tree->lock);
 
         if (!em && unplug_page)
                 return 0;
@@ -2763,9 +2804,9 @@ int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
         u64 stripe_nr;
         int i, j, nr = 0;
 
-        spin_lock(&em_tree->lock);
+        read_lock(&em_tree->lock);
         em = lookup_extent_mapping(em_tree, chunk_start, 1);
-        spin_unlock(&em_tree->lock);
+        read_unlock(&em_tree->lock);
 
         BUG_ON(!em || em->start != chunk_start);
         map = (struct map_lookup *)em->bdev;
@@ -3053,9 +3094,9 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
         logical = key->offset;
         length = btrfs_chunk_length(leaf, chunk);
 
-        spin_lock(&map_tree->map_tree.lock);
+        read_lock(&map_tree->map_tree.lock);
         em = lookup_extent_mapping(&map_tree->map_tree, logical, 1);
-        spin_unlock(&map_tree->map_tree.lock);
+        read_unlock(&map_tree->map_tree.lock);
 
         /* already mapped? */
         if (em && em->start <= logical && em->start + em->len > logical) {
@@ -3114,9 +3155,9 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
                 map->stripes[i].dev->in_fs_metadata = 1;
         }
 
-        spin_lock(&map_tree->map_tree.lock);
+        write_lock(&map_tree->map_tree.lock);
         ret = add_extent_mapping(&map_tree->map_tree, em);
-        spin_unlock(&map_tree->map_tree.lock);
+        write_unlock(&map_tree->map_tree.lock);
         BUG_ON(ret);
         free_extent_map(em);
 
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 5139a833f721..31b0fabdd2ea 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -181,4 +181,7 @@ int btrfs_balance(struct btrfs_root *dev_root);
 void btrfs_unlock_volumes(void);
 void btrfs_lock_volumes(void);
 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
+int find_free_dev_extent(struct btrfs_trans_handle *trans,
+                         struct btrfs_device *device, u64 num_bytes,
+                         u64 *start, u64 *max_avail);
 #endif
diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c
index a9d3bf4d2689..b0fc93f95fd0 100644
--- a/fs/btrfs/xattr.c
+++ b/fs/btrfs/xattr.c
@@ -260,7 +260,7 @@ err:
  * attributes are handled directly.
  */
 struct xattr_handler *btrfs_xattr_handlers[] = {
-#ifdef CONFIG_FS_POSIX_ACL
+#ifdef CONFIG_BTRFS_POSIX_ACL
         &btrfs_xattr_acl_access_handler,
         &btrfs_xattr_acl_default_handler,
 #endif
diff --git a/fs/buffer.c b/fs/buffer.c
index 90a98865b0cc..6fa530256bfd 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -52,6 +52,7 @@ init_buffer(struct buffer_head *bh, bh_end_io_t *handler, void *private)
         bh->b_end_io = handler;
         bh->b_private = private;
 }
+EXPORT_SYMBOL(init_buffer);
 
 static int sync_buffer(void *word)
 {
@@ -80,6 +81,7 @@ void unlock_buffer(struct buffer_head *bh)
         smp_mb__after_clear_bit();
         wake_up_bit(&bh->b_state, BH_Lock);
 }
+EXPORT_SYMBOL(unlock_buffer);
 
 /*
  * Block until a buffer comes unlocked.  This doesn't stop it
@@ -90,6 +92,7 @@ void __wait_on_buffer(struct buffer_head * bh)
 {
         wait_on_bit(&bh->b_state, BH_Lock, sync_buffer, TASK_UNINTERRUPTIBLE);
 }
+EXPORT_SYMBOL(__wait_on_buffer);
 
 static void
 __clear_page_buffers(struct page *page)
@@ -144,6 +147,7 @@ void end_buffer_read_sync(struct buffer_head *bh, int uptodate)
         __end_buffer_read_notouch(bh, uptodate);
         put_bh(bh);
 }
+EXPORT_SYMBOL(end_buffer_read_sync);
 
 void end_buffer_write_sync(struct buffer_head *bh, int uptodate)
 {
@@ -164,6 +168,7 @@ void end_buffer_write_sync(struct buffer_head *bh, int uptodate)
         unlock_buffer(bh);
         put_bh(bh);
 }
+EXPORT_SYMBOL(end_buffer_write_sync);
 
 /*
  * Various filesystems appear to want __find_get_block to be non-blocking.
@@ -272,9 +277,10 @@ void invalidate_bdev(struct block_device *bdev)
         invalidate_bh_lrus();
         invalidate_mapping_pages(mapping, 0, -1);
 }
+EXPORT_SYMBOL(invalidate_bdev);
 
 /*
- * Kick pdflush then try to free up some ZONE_NORMAL memory.
+ * Kick the writeback threads then try to free up some ZONE_NORMAL memory.
  */
 static void free_more_memory(void)
 {
@@ -410,6 +416,7 @@ still_busy:
         local_irq_restore(flags);
         return;
 }
+EXPORT_SYMBOL(end_buffer_async_write);
 
 /*
  * If a page's buffers are under async readin (end_buffer_async_read
@@ -438,8 +445,8 @@ static void mark_buffer_async_read(struct buffer_head *bh)
         set_buffer_async_read(bh);
 }
 
-void mark_buffer_async_write_endio(struct buffer_head *bh,
-                                   bh_end_io_t *handler)
+static void mark_buffer_async_write_endio(struct buffer_head *bh,
+                                          bh_end_io_t *handler)
 {
         bh->b_end_io = handler;
         set_buffer_async_write(bh);
@@ -553,7 +560,7 @@ repeat:
         return err;
 }
 
-void do_thaw_all(struct work_struct *work)
+static void do_thaw_all(struct work_struct *work)
 {
         struct super_block *sb;
         char b[BDEVNAME_SIZE];
@@ -1172,6 +1179,7 @@ void mark_buffer_dirty(struct buffer_head *bh)
                 }
         }
 }
+EXPORT_SYMBOL(mark_buffer_dirty);
 
 /*
  * Decrement a buffer_head's reference count.  If all buffers against a page
@@ -1188,6 +1196,7 @@ void __brelse(struct buffer_head * buf)
         }
         WARN(1, KERN_ERR "VFS: brelse: Trying to free free buffer\n");
 }
+EXPORT_SYMBOL(__brelse);
 
 /*
  * bforget() is like brelse(), except it discards any
@@ -1206,6 +1215,7 @@ void __bforget(struct buffer_head *bh)
         }
         __brelse(bh);
 }
+EXPORT_SYMBOL(__bforget);
 
 static struct buffer_head *__bread_slow(struct buffer_head *bh)
 {
@@ -1699,9 +1709,9 @@ static int __block_write_full_page(struct inode *inode, struct page *page,
                 /*
                  * If it's a fully non-blocking write attempt and we cannot
                  * lock the buffer then redirty the page.  Note that this can
-                 * potentially cause a busy-wait loop from pdflush and kswapd
-                 * activity, but those code paths have their own higher-level
-                 * throttling.
+                 * potentially cause a busy-wait loop from writeback threads
+                 * and kswapd activity, but those code paths have their own
+                 * higher-level throttling.
                  */
                 if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) {
                         lock_buffer(bh);
@@ -2218,6 +2228,7 @@ int block_read_full_page(struct page *page, get_block_t *get_block)
         }
         return 0;
 }
+EXPORT_SYMBOL(block_read_full_page);
 
 /* utility function for filesystems that need to do work on expanding
  * truncates.  Uses filesystem pagecache writes to allow the filesystem to
@@ -2228,16 +2239,10 @@ int generic_cont_expand_simple(struct inode *inode, loff_t size)
         struct address_space *mapping = inode->i_mapping;
         struct page *page;
         void *fsdata;
-        unsigned long limit;
         int err;
 
-        err = -EFBIG;
-        limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
-        if (limit != RLIM_INFINITY && size > (loff_t)limit) {
-                send_sig(SIGXFSZ, current, 0);
-                goto out;
-        }
-        if (size > inode->i_sb->s_maxbytes)
+        err = inode_newsize_ok(inode, size);
+        if (err)
                 goto out;
 
         err = pagecache_write_begin(NULL, mapping, size, 0,
@@ -2252,6 +2257,7 @@ int generic_cont_expand_simple(struct inode *inode, loff_t size)
 out:
         return err;
 }
+EXPORT_SYMBOL(generic_cont_expand_simple);
 
 static int cont_expand_zero(struct file *file, struct address_space *mapping,
                             loff_t pos, loff_t *bytes)
@@ -2352,6 +2358,7 @@ int cont_write_begin(struct file *file, struct address_space *mapping,
 out:
         return err;
 }
+EXPORT_SYMBOL(cont_write_begin);
 
 int block_prepare_write(struct page *page, unsigned from, unsigned to,
                         get_block_t *get_block)
@@ -2362,6 +2369,7 @@ int block_prepare_write(struct page *page, unsigned from, unsigned to,
                 ClearPageUptodate(page);
         return err;
 }
+EXPORT_SYMBOL(block_prepare_write);
 
 int block_commit_write(struct page *page, unsigned from, unsigned to)
 {
@@ -2369,6 +2377,7 @@ int block_commit_write(struct page *page, unsigned from, unsigned to)
         __block_commit_write(inode,page,from,to);
         return 0;
 }
+EXPORT_SYMBOL(block_commit_write);
 
 /*
  * block_page_mkwrite() is not allowed to change the file size as it gets
@@ -2426,6 +2435,7 @@ block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
 out:
         return ret;
 }
+EXPORT_SYMBOL(block_page_mkwrite);
 
 /*
  * nobh_write_begin()'s prereads are special: the buffer_heads are freed
@@ -2849,6 +2859,7 @@ unlock:
 out:
         return err;
 }
+EXPORT_SYMBOL(block_truncate_page);
 
 /*
  * The generic ->writepage function for buffer-backed address_spaces
@@ -2890,6 +2901,7 @@ int block_write_full_page_endio(struct page *page, get_block_t *get_block,
         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
         return __block_write_full_page(inode, page, get_block, wbc, handler);
 }
+EXPORT_SYMBOL(block_write_full_page_endio);
 
 /*
  * The generic ->writepage function for buffer-backed address_spaces
@@ -2900,7 +2912,7 @@ int block_write_full_page(struct page *page, get_block_t *get_block,
         return block_write_full_page_endio(page, get_block, wbc,
                                            end_buffer_async_write);
 }
-
+EXPORT_SYMBOL(block_write_full_page);
 
 sector_t generic_block_bmap(struct address_space *mapping, sector_t block,
                             get_block_t *get_block)
@@ -2913,6 +2925,7 @@ sector_t generic_block_bmap(struct address_space *mapping, sector_t block,
         get_block(inode, block, &tmp, 0);
         return tmp.b_blocknr;
 }
+EXPORT_SYMBOL(generic_block_bmap);
 
 static void end_bio_bh_io_sync(struct bio *bio, int err)
 {
@@ -2982,6 +2995,7 @@ int submit_bh(int rw, struct buffer_head * bh)
         bio_put(bio);
         return ret;
 }
+EXPORT_SYMBOL(submit_bh);
 
 /**
  * ll_rw_block: low-level access to block devices (DEPRECATED)
@@ -3043,6 +3057,7 @@ void ll_rw_block(int rw, int nr, struct buffer_head *bhs[])
                 unlock_buffer(bh);
         }
 }
+EXPORT_SYMBOL(ll_rw_block);
 
 /*
  * For a data-integrity writeout, we need to wait upon any in-progress I/O
@@ -3071,6 +3086,7 @@ int sync_dirty_buffer(struct buffer_head *bh)
         }
         return ret;
 }
+EXPORT_SYMBOL(sync_dirty_buffer);
 
 /*
  * try_to_free_buffers() checks if all the buffers on this particular page
@@ -3185,13 +3201,14 @@ void block_sync_page(struct page *page)
         if (mapping)
                 blk_run_backing_dev(mapping->backing_dev_info, page);
 }
+EXPORT_SYMBOL(block_sync_page);
 
 /*
  * There are no bdflush tunables left.  But distributions are
  * still running obsolete flush daemons, so we terminate them here.
  *
  * Use of bdflush() is deprecated and will be removed in a future kernel.
- * The `pdflush' kernel threads fully replace bdflush daemons and this call.
+ * The `flush-X' kernel threads fully replace bdflush daemons and this call.
  */
 SYSCALL_DEFINE2(bdflush, int, func, long, data)
 {
@@ -3361,29 +3378,3 @@ void __init buffer_init(void)
         max_buffer_heads = nrpages * (PAGE_SIZE / sizeof(struct buffer_head));
         hotcpu_notifier(buffer_cpu_notify, 0);
 }
-
-EXPORT_SYMBOL(__bforget);
-EXPORT_SYMBOL(__brelse);
-EXPORT_SYMBOL(__wait_on_buffer);
-EXPORT_SYMBOL(block_commit_write);
-EXPORT_SYMBOL(block_prepare_write);
-EXPORT_SYMBOL(block_page_mkwrite);
-EXPORT_SYMBOL(block_read_full_page);
-EXPORT_SYMBOL(block_sync_page);
-EXPORT_SYMBOL(block_truncate_page);
-EXPORT_SYMBOL(block_write_full_page);
-EXPORT_SYMBOL(block_write_full_page_endio);
-EXPORT_SYMBOL(cont_write_begin);
-EXPORT_SYMBOL(end_buffer_read_sync);
-EXPORT_SYMBOL(end_buffer_write_sync);
-EXPORT_SYMBOL(end_buffer_async_write);
-EXPORT_SYMBOL(file_fsync);
-EXPORT_SYMBOL(generic_block_bmap);
-EXPORT_SYMBOL(generic_cont_expand_simple);
-EXPORT_SYMBOL(init_buffer);
-EXPORT_SYMBOL(invalidate_bdev);
-EXPORT_SYMBOL(ll_rw_block);
-EXPORT_SYMBOL(mark_buffer_dirty);
-EXPORT_SYMBOL(submit_bh);
-EXPORT_SYMBOL(sync_dirty_buffer);
-EXPORT_SYMBOL(unlock_buffer);
diff --git a/fs/char_dev.c b/fs/char_dev.c
index 3cbc57f932d2..d6db933df2b2 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -264,7 +264,6 @@ int __register_chrdev(unsigned int major, unsigned int baseminor,
 {
         struct char_device_struct *cd;
         struct cdev *cdev;
-        char *s;
         int err = -ENOMEM;
 
         cd = __register_chrdev_region(major, baseminor, count, name);
@@ -278,8 +277,6 @@ int __register_chrdev(unsigned int major, unsigned int baseminor,
         cdev->owner = fops->owner;
         cdev->ops = fops;
         kobject_set_name(&cdev->kobj, "%s", name);
-        for (s = strchr(kobject_name(&cdev->kobj),'/'); s; s = strchr(s, '/'))
-                *s = '!';
                 
         err = cdev_add(cdev, MKDEV(cd->major, baseminor), count);
         if (err)
diff --git a/fs/cifs/Kconfig b/fs/cifs/Kconfig
index 6994a0f54f02..80f352596807 100644
--- a/fs/cifs/Kconfig
+++ b/fs/cifs/Kconfig
@@ -2,6 +2,7 @@ config CIFS
         tristate "CIFS support (advanced network filesystem, SMBFS successor)"
         depends on INET
         select NLS
+        select SLOW_WORK
         help
           This is the client VFS module for the Common Internet File System
           (CIFS) protocol which is the successor to the Server Message Block
diff --git a/fs/cifs/cifs_dfs_ref.c b/fs/cifs/cifs_dfs_ref.c
index 606912d8f2a8..fea9e898c4ba 100644
--- a/fs/cifs/cifs_dfs_ref.c
+++ b/fs/cifs/cifs_dfs_ref.c
@@ -142,7 +142,7 @@ char *cifs_compose_mount_options(const char *sb_mountdata,
         rc = dns_resolve_server_name_to_ip(*devname, &srvIP);
         if (rc != 0) {
                 cERROR(1, ("%s: Failed to resolve server part of %s to IP: %d",
-                          __func__, *devname, rc));;
+                          __func__, *devname, rc));
                 goto compose_mount_options_err;
         }
         /* md_len = strlen(...) + 12 for 'sep+prefixpath='
@@ -385,7 +385,7 @@ out_err:
         goto out;
 }
 
-struct inode_operations cifs_dfs_referral_inode_operations = {
+const struct inode_operations cifs_dfs_referral_inode_operations = {
         .follow_link = cifs_dfs_follow_mountpoint,
 };
 
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 3610e9958b4c..9a5e4f5f3122 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -50,7 +50,7 @@
 #define CIFS_MAGIC_NUMBER 0xFF534D42    /* the first four bytes of SMB PDUs */
 
 #ifdef CONFIG_CIFS_QUOTA
-static struct quotactl_ops cifs_quotactl_ops;
+static const struct quotactl_ops cifs_quotactl_ops;
 #endif /* QUOTA */
 
 int cifsFYI = 0;
@@ -64,9 +64,6 @@ unsigned int multiuser_mount = 0;
 unsigned int extended_security = CIFSSEC_DEF;
 /* unsigned int ntlmv2_support = 0; */
 unsigned int sign_CIFS_PDUs = 1;
-extern struct task_struct *oplockThread; /* remove sparse warning */
-struct task_struct *oplockThread = NULL;
-/* extern struct task_struct * dnotifyThread; remove sparse warning */
 static const struct super_operations cifs_super_ops;
 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
 module_param(CIFSMaxBufSize, int, 0);
@@ -185,8 +182,7 @@ out_mount_failed:
                         cifs_sb->mountdata = NULL;
                 }
 #endif
-                if (cifs_sb->local_nls)
-                        unload_nls(cifs_sb->local_nls);
+                unload_nls(cifs_sb->local_nls);
                 kfree(cifs_sb);
         }
         return rc;
@@ -517,7 +513,7 @@ int cifs_xstate_get(struct super_block *sb, struct fs_quota_stat *qstats)
         return rc;
 }
 
-static struct quotactl_ops cifs_quotactl_ops = {
+static const struct quotactl_ops cifs_quotactl_ops = {
         .set_xquota     = cifs_xquota_set,
         .get_xquota     = cifs_xquota_get,
         .set_xstate     = cifs_xstate_set,
@@ -973,89 +969,12 @@ cifs_destroy_mids(void)
         kmem_cache_destroy(cifs_oplock_cachep);
 }
 
-static int cifs_oplock_thread(void *dummyarg)
-{
-        struct oplock_q_entry *oplock_item;
-        struct cifsTconInfo *pTcon;
-        struct inode *inode;
-        __u16  netfid;
-        int rc, waitrc = 0;
-
-        set_freezable();
-        do {
-                if (try_to_freeze())
-                        continue;
-
-                spin_lock(&cifs_oplock_lock);
-                if (list_empty(&cifs_oplock_list)) {
-                        spin_unlock(&cifs_oplock_lock);
-                        set_current_state(TASK_INTERRUPTIBLE);
-                        schedule_timeout(39*HZ);
-                } else {
-                        oplock_item = list_entry(cifs_oplock_list.next,
-                                                struct oplock_q_entry, qhead);
-                        cFYI(1, ("found oplock item to write out"));
-                        pTcon = oplock_item->tcon;
-                        inode = oplock_item->pinode;
-                        netfid = oplock_item->netfid;
-                        spin_unlock(&cifs_oplock_lock);
-                        DeleteOplockQEntry(oplock_item);
-                        /* can not grab inode sem here since it would
-                                deadlock when oplock received on delete
-                                since vfs_unlink holds the i_mutex across
-                                the call */
-                        /* mutex_lock(&inode->i_mutex);*/
-                        if (S_ISREG(inode->i_mode)) {
-#ifdef CONFIG_CIFS_EXPERIMENTAL
-                                if (CIFS_I(inode)->clientCanCacheAll == 0)
-                                        break_lease(inode, FMODE_READ);
-                                else if (CIFS_I(inode)->clientCanCacheRead == 0)
-                                        break_lease(inode, FMODE_WRITE);
-#endif
-                                rc = filemap_fdatawrite(inode->i_mapping);
-                                if (CIFS_I(inode)->clientCanCacheRead == 0) {
-                                        waitrc = filemap_fdatawait(
-                                                              inode->i_mapping);
-                                        invalidate_remote_inode(inode);
-                                }
-                                if (rc == 0)
-                                        rc = waitrc;
-                        } else
-                                rc = 0;
-                        /* mutex_unlock(&inode->i_mutex);*/
-                        if (rc)
-                                CIFS_I(inode)->write_behind_rc = rc;
-                        cFYI(1, ("Oplock flush inode %p rc %d",
-                                inode, rc));
-
-                                /* releasing stale oplock after recent reconnect
-                                of smb session using a now incorrect file
-                                handle is not a data integrity issue but do
-                                not bother sending an oplock release if session
-                                to server still is disconnected since oplock
-                                already released by the server in that case */
-                        if (!pTcon->need_reconnect) {
-                                rc = CIFSSMBLock(0, pTcon, netfid,
-                                                0 /* len */ , 0 /* offset */, 0,
-                                                0, LOCKING_ANDX_OPLOCK_RELEASE,
-                                                false /* wait flag */);
-                                cFYI(1, ("Oplock release rc = %d", rc));
-                        }
-                        set_current_state(TASK_INTERRUPTIBLE);
-                        schedule_timeout(1);  /* yield in case q were corrupt */
-                }
-        } while (!kthread_should_stop());
-
-        return 0;
-}
-
 static int __init
 init_cifs(void)
 {
         int rc = 0;
         cifs_proc_init();
         INIT_LIST_HEAD(&cifs_tcp_ses_list);
-        INIT_LIST_HEAD(&cifs_oplock_list);
 #ifdef CONFIG_CIFS_EXPERIMENTAL
         INIT_LIST_HEAD(&GlobalDnotifyReqList);
         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
@@ -1084,7 +1003,6 @@ init_cifs(void)
         rwlock_init(&GlobalSMBSeslock);
         rwlock_init(&cifs_tcp_ses_lock);
         spin_lock_init(&GlobalMid_Lock);
-        spin_lock_init(&cifs_oplock_lock);
 
         if (cifs_max_pending < 2) {
                 cifs_max_pending = 2;
@@ -1119,16 +1037,13 @@ init_cifs(void)
         if (rc)
                 goto out_unregister_key_type;
 #endif
-        oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
-        if (IS_ERR(oplockThread)) {
-                rc = PTR_ERR(oplockThread);
-                cERROR(1, ("error %d create oplock thread", rc));
-                goto out_unregister_dfs_key_type;
-        }
+        rc = slow_work_register_user();
+        if (rc)
+                goto out_unregister_resolver_key;
 
         return 0;
 
- out_unregister_dfs_key_type:
+ out_unregister_resolver_key:
 #ifdef CONFIG_CIFS_DFS_UPCALL
         unregister_key_type(&key_type_dns_resolver);
  out_unregister_key_type:
@@ -1165,7 +1080,6 @@ exit_cifs(void)
         cifs_destroy_inodecache();
         cifs_destroy_mids();
         cifs_destroy_request_bufs();
-        kthread_stop(oplockThread);
 }
 
 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
index 094325e3f714..ac2b24c192f8 100644
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -67,7 +67,7 @@ extern int cifs_setattr(struct dentry *, struct iattr *);
 
 extern const struct inode_operations cifs_file_inode_ops;
 extern const struct inode_operations cifs_symlink_inode_ops;
-extern struct inode_operations cifs_dfs_referral_inode_operations;
+extern const struct inode_operations cifs_dfs_referral_inode_operations;
 
 
 /* Functions related to files and directories */
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 6cfc81a32703..5d0fde18039c 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -18,6 +18,7 @@
  */
 #include <linux/in.h>
 #include <linux/in6.h>
+#include <linux/slow-work.h>
 #include "cifs_fs_sb.h"
 #include "cifsacl.h"
 /*
@@ -346,14 +347,16 @@ struct cifsFileInfo {
         /* lock scope id (0 if none) */
         struct file *pfile; /* needed for writepage */
         struct inode *pInode; /* needed for oplock break */
+        struct vfsmount *mnt;
         struct mutex lock_mutex;
         struct list_head llist; /* list of byte range locks we have. */
         bool closePend:1;       /* file is marked to close */
         bool invalidHandle:1;   /* file closed via session abend */
-        bool messageMode:1;     /* for pipes: message vs byte mode */
+        bool oplock_break_cancelled:1;
         atomic_t count;         /* reference count */
         struct mutex fh_mutex; /* prevents reopen race after dead ses*/
         struct cifs_search_info srch_inf;
+        struct slow_work oplock_break; /* slow_work job for oplock breaks */
 };
 
 /* Take a reference on the file private data */
@@ -365,8 +368,10 @@ static inline void cifsFileInfo_get(struct cifsFileInfo *cifs_file)
 /* Release a reference on the file private data */
 static inline void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
 {
-        if (atomic_dec_and_test(&cifs_file->count))
+        if (atomic_dec_and_test(&cifs_file->count)) {
+                iput(cifs_file->pInode);
                 kfree(cifs_file);
+        }
 }
 
 /*
@@ -382,7 +387,6 @@ struct cifsInodeInfo {
         unsigned long time;     /* jiffies of last update/check of inode */
         bool clientCanCacheRead:1;      /* read oplock */
         bool clientCanCacheAll:1;       /* read and writebehind oplock */
-        bool oplockPending:1;
         bool delete_pending:1;          /* DELETE_ON_CLOSE is set */
         u64  server_eof;                /* current file size on server */
         u64  uniqueid;                  /* server inode number */
@@ -585,9 +589,9 @@ require use of the stronger protocol */
 #define   CIFSSEC_MUST_LANMAN   0x10010
 #define   CIFSSEC_MUST_PLNTXT   0x20020
 #ifdef CONFIG_CIFS_UPCALL
-#define   CIFSSEC_MASK          0xAF0AF /* allows weak security but also krb5 */
+#define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
 #else
-#define   CIFSSEC_MASK          0xA70A7 /* current flags supported if weak */
+#define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
 #endif /* UPCALL */
 #else /* do not allow weak pw hash */
 #ifdef CONFIG_CIFS_UPCALL
@@ -669,12 +673,6 @@ GLOBAL_EXTERN rwlock_t		cifs_tcp_ses_lock;
  */
 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;
 
-/* Global list of oplocks */
-GLOBAL_EXTERN struct list_head cifs_oplock_list;
-
-/* Protects the cifs_oplock_list */
-GLOBAL_EXTERN spinlock_t cifs_oplock_lock;
-
 /* Outstanding dir notify requests */
 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 /* DirNotify response queue */
@@ -725,3 +723,4 @@ GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 
+extern const struct slow_work_ops cifs_oplock_break_ops;
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index da8fbf565991..6928c24d1d42 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -86,18 +86,17 @@ extern int CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses,
                              const int stage,
                              const struct nls_table *nls_cp);
 extern __u16 GetNextMid(struct TCP_Server_Info *server);
-extern struct oplock_q_entry *AllocOplockQEntry(struct inode *, u16,
-                                                 struct cifsTconInfo *);
-extern void DeleteOplockQEntry(struct oplock_q_entry *);
-extern void DeleteTconOplockQEntries(struct cifsTconInfo *);
 extern struct timespec cifs_NTtimeToUnix(__le64 utc_nanoseconds_since_1601);
 extern u64 cifs_UnixTimeToNT(struct timespec);
 extern struct timespec cnvrtDosUnixTm(__le16 le_date, __le16 le_time,
                                       int offset);
 
+extern struct cifsFileInfo *cifs_new_fileinfo(struct inode *newinode,
+                                __u16 fileHandle, struct file *file,
+                                struct vfsmount *mnt, unsigned int oflags);
 extern int cifs_posix_open(char *full_path, struct inode **pinode,
-                           struct super_block *sb, int mode, int oflags,
-                           int *poplock, __u16 *pnetfid, int xid);
+                           struct vfsmount *mnt, int mode, int oflags,
+                           __u32 *poplock, __u16 *pnetfid, int xid);
 extern void cifs_unix_basic_to_fattr(struct cifs_fattr *fattr,
                                      FILE_UNIX_BASIC_INFO *info,
                                      struct cifs_sb_info *cifs_sb);
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 301e307e1279..941441d3e386 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -94,6 +94,7 @@ static void mark_open_files_invalid(struct cifsTconInfo *pTcon)
         list_for_each_safe(tmp, tmp1, &pTcon->openFileList) {
                 open_file = list_entry(tmp, struct cifsFileInfo, tlist);
                 open_file->invalidHandle = true;
+                open_file->oplock_break_cancelled = true;
         }
         write_unlock(&GlobalSMBSeslock);
         /* BB Add call to invalidate_inodes(sb) for all superblocks mounted
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index d49682433c20..43003e0bef18 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1670,7 +1670,6 @@ cifs_put_tcon(struct cifsTconInfo *tcon)
         CIFSSMBTDis(xid, tcon);
         _FreeXid(xid);
 
-        DeleteTconOplockQEntries(tcon);
         tconInfoFree(tcon);
         cifs_put_smb_ses(ses);
 }
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index a6424cfc0121..627a60a6c1b1 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -24,6 +24,7 @@
 #include <linux/stat.h>
 #include <linux/slab.h>
 #include <linux/namei.h>
+#include <linux/mount.h>
 #include "cifsfs.h"
 #include "cifspdu.h"
 #include "cifsglob.h"
@@ -129,44 +130,45 @@ cifs_bp_rename_retry:
         return full_path;
 }
 
-static void
-cifs_fill_fileinfo(struct inode *newinode, __u16 fileHandle,
-                        struct cifsTconInfo *tcon, bool write_only)
+struct cifsFileInfo *
+cifs_new_fileinfo(struct inode *newinode, __u16 fileHandle,
+                  struct file *file, struct vfsmount *mnt, unsigned int oflags)
 {
         int oplock = 0;
         struct cifsFileInfo *pCifsFile;
         struct cifsInodeInfo *pCifsInode;
+        struct cifs_sb_info *cifs_sb = CIFS_SB(mnt->mnt_sb);
 
         pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
-
         if (pCifsFile == NULL)
-                return;
+                return pCifsFile;
 
         if (oplockEnabled)
                 oplock = REQ_OPLOCK;
 
         pCifsFile->netfid = fileHandle;
         pCifsFile->pid = current->tgid;
-        pCifsFile->pInode = newinode;
+        pCifsFile->pInode = igrab(newinode);
+        pCifsFile->mnt = mnt;
+        pCifsFile->pfile = file;
         pCifsFile->invalidHandle = false;
         pCifsFile->closePend = false;
         mutex_init(&pCifsFile->fh_mutex);
         mutex_init(&pCifsFile->lock_mutex);
         INIT_LIST_HEAD(&pCifsFile->llist);
         atomic_set(&pCifsFile->count, 1);
+        slow_work_init(&pCifsFile->oplock_break, &cifs_oplock_break_ops);
 
-        /* set the following in open now
-                        pCifsFile->pfile = file; */
         write_lock(&GlobalSMBSeslock);
-        list_add(&pCifsFile->tlist, &tcon->openFileList);
+        list_add(&pCifsFile->tlist, &cifs_sb->tcon->openFileList);
         pCifsInode = CIFS_I(newinode);
         if (pCifsInode) {
                 /* if readable file instance put first in list*/
-                if (write_only)
+                if (oflags & FMODE_READ)
+                        list_add(&pCifsFile->flist, &pCifsInode->openFileList);
+                else
                         list_add_tail(&pCifsFile->flist,
                                       &pCifsInode->openFileList);
-                else
-                        list_add(&pCifsFile->flist, &pCifsInode->openFileList);
 
                 if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
                         pCifsInode->clientCanCacheAll = true;
@@ -176,18 +178,18 @@ cifs_fill_fileinfo(struct inode *newinode, __u16 fileHandle,
                                 pCifsInode->clientCanCacheRead = true;
         }
         write_unlock(&GlobalSMBSeslock);
+
+        return pCifsFile;
 }
 
 int cifs_posix_open(char *full_path, struct inode **pinode,
-                    struct super_block *sb, int mode, int oflags,
-                    int *poplock, __u16 *pnetfid, int xid)
+                    struct vfsmount *mnt, int mode, int oflags,
+                    __u32 *poplock, __u16 *pnetfid, int xid)
 {
         int rc;
-        __u32 oplock;
-        bool write_only = false;
         FILE_UNIX_BASIC_INFO *presp_data;
         __u32 posix_flags = 0;
-        struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+        struct cifs_sb_info *cifs_sb = CIFS_SB(mnt->mnt_sb);
         struct cifs_fattr fattr;
 
         cFYI(1, ("posix open %s", full_path));
@@ -223,12 +225,9 @@ int cifs_posix_open(char *full_path, struct inode **pinode,
         if (oflags & O_DIRECT)
                 posix_flags |= SMB_O_DIRECT;
 
-        if (!(oflags & FMODE_READ))
-                write_only = true;
-
         mode &= ~current_umask();
         rc = CIFSPOSIXCreate(xid, cifs_sb->tcon, posix_flags, mode,
-                        pnetfid, presp_data, &oplock, full_path,
+                        pnetfid, presp_data, poplock, full_path,
                         cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
         if (rc)
@@ -244,7 +243,7 @@ int cifs_posix_open(char *full_path, struct inode **pinode,
 
         /* get new inode and set it up */
         if (*pinode == NULL) {
-                *pinode = cifs_iget(sb, &fattr);
+                *pinode = cifs_iget(mnt->mnt_sb, &fattr);
                 if (!*pinode) {
                         rc = -ENOMEM;
                         goto posix_open_ret;
@@ -253,7 +252,7 @@ int cifs_posix_open(char *full_path, struct inode **pinode,
                 cifs_fattr_to_inode(*pinode, &fattr);
         }
 
-        cifs_fill_fileinfo(*pinode, *pnetfid, cifs_sb->tcon, write_only);
+        cifs_new_fileinfo(*pinode, *pnetfid, NULL, mnt, oflags);
 
 posix_open_ret:
         kfree(presp_data);
@@ -280,7 +279,7 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
         int rc = -ENOENT;
         int xid;
         int create_options = CREATE_NOT_DIR;
-        int oplock = 0;
+        __u32 oplock = 0;
         int oflags;
         bool posix_create = false;
         /*
@@ -298,7 +297,6 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
         FILE_ALL_INFO *buf = NULL;
         struct inode *newinode = NULL;
         int disposition = FILE_OVERWRITE_IF;
-        bool write_only = false;
 
         xid = GetXid();
 
@@ -323,7 +321,7 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
         if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
             (CIFS_UNIX_POSIX_PATH_OPS_CAP &
                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
-                rc = cifs_posix_open(full_path, &newinode, inode->i_sb,
+                rc = cifs_posix_open(full_path, &newinode, nd->path.mnt,
                                      mode, oflags, &oplock, &fileHandle, xid);
                 /* EIO could indicate that (posix open) operation is not
                    supported, despite what server claimed in capability
@@ -351,11 +349,8 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
                 desiredAccess = 0;
                 if (oflags & FMODE_READ)
                         desiredAccess |= GENERIC_READ; /* is this too little? */
-                if (oflags & FMODE_WRITE) {
+                if (oflags & FMODE_WRITE)
                         desiredAccess |= GENERIC_WRITE;
-                        if (!(oflags & FMODE_READ))
-                                write_only = true;
-                }
 
                 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
                         disposition = FILE_CREATE;
@@ -470,8 +465,8 @@ cifs_create_set_dentry:
                 /* mknod case - do not leave file open */
                 CIFSSMBClose(xid, tcon, fileHandle);
         } else if (!(posix_create) && (newinode)) {
-                        cifs_fill_fileinfo(newinode, fileHandle,
-                                        cifs_sb->tcon, write_only);
+                        cifs_new_fileinfo(newinode, fileHandle, NULL,
+                                                nd->path.mnt, oflags);
         }
 cifs_create_out:
         kfree(buf);
@@ -611,7 +606,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 {
         int xid;
         int rc = 0; /* to get around spurious gcc warning, set to zero here */
-        int oplock = 0;
+        __u32 oplock = 0;
         __u16 fileHandle = 0;
         bool posix_open = false;
         struct cifs_sb_info *cifs_sb;
@@ -683,8 +678,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
                 if (!(nd->flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY)) &&
                      (nd->flags & LOOKUP_OPEN) && !pTcon->broken_posix_open &&
                      (nd->intent.open.flags & O_CREAT)) {
-                        rc = cifs_posix_open(full_path, &newInode,
-                                        parent_dir_inode->i_sb,
+                        rc = cifs_posix_open(full_path, &newInode, nd->path.mnt,
                                         nd->intent.open.create_mode,
                                         nd->intent.open.flags, &oplock,
                                         &fileHandle, xid);
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index fa7beac8b80e..429337eb7afe 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -30,6 +30,7 @@
 #include <linux/writeback.h>
 #include <linux/task_io_accounting_ops.h>
 #include <linux/delay.h>
+#include <linux/mount.h>
 #include <asm/div64.h>
 #include "cifsfs.h"
 #include "cifspdu.h"
@@ -39,27 +40,6 @@
 #include "cifs_debug.h"
 #include "cifs_fs_sb.h"
 
-static inline struct cifsFileInfo *cifs_init_private(
-        struct cifsFileInfo *private_data, struct inode *inode,
-        struct file *file, __u16 netfid)
-{
-        memset(private_data, 0, sizeof(struct cifsFileInfo));
-        private_data->netfid = netfid;
-        private_data->pid = current->tgid;
-        mutex_init(&private_data->fh_mutex);
-        mutex_init(&private_data->lock_mutex);
-        INIT_LIST_HEAD(&private_data->llist);
-        private_data->pfile = file; /* needed for writepage */
-        private_data->pInode = inode;
-        private_data->invalidHandle = false;
-        private_data->closePend = false;
-        /* Initialize reference count to one.  The private data is
-        freed on the release of the last reference */
-        atomic_set(&private_data->count, 1);
-
-        return private_data;
-}
-
 static inline int cifs_convert_flags(unsigned int flags)
 {
         if ((flags & O_ACCMODE) == O_RDONLY)
@@ -123,9 +103,11 @@ static inline int cifs_get_disposition(unsigned int flags)
 }
 
 /* all arguments to this function must be checked for validity in caller */
-static inline int cifs_posix_open_inode_helper(struct inode *inode,
-                        struct file *file, struct cifsInodeInfo *pCifsInode,
-                        struct cifsFileInfo *pCifsFile, int oplock, u16 netfid)
+static inline int
+cifs_posix_open_inode_helper(struct inode *inode, struct file *file,
+                             struct cifsInodeInfo *pCifsInode,
+                             struct cifsFileInfo *pCifsFile, __u32 oplock,
+                             u16 netfid)
 {
 
         write_lock(&GlobalSMBSeslock);
@@ -219,17 +201,6 @@ static inline int cifs_open_inode_helper(struct inode *inode, struct file *file,
         struct timespec temp;
         int rc;
 
-        /* want handles we can use to read with first
-           in the list so we do not have to walk the
-           list to search for one in write_begin */
-        if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
-                list_add_tail(&pCifsFile->flist,
-                              &pCifsInode->openFileList);
-        } else {
-                list_add(&pCifsFile->flist,
-                         &pCifsInode->openFileList);
-        }
-        write_unlock(&GlobalSMBSeslock);
         if (pCifsInode->clientCanCacheRead) {
                 /* we have the inode open somewhere else
                    no need to discard cache data */
@@ -279,7 +250,8 @@ client_can_cache:
 int cifs_open(struct inode *inode, struct file *file)
 {
         int rc = -EACCES;
-        int xid, oplock;
+        int xid;
+        __u32 oplock;
         struct cifs_sb_info *cifs_sb;
         struct cifsTconInfo *tcon;
         struct cifsFileInfo *pCifsFile;
@@ -324,7 +296,7 @@ int cifs_open(struct inode *inode, struct file *file)
                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
                 int oflags = (int) cifs_posix_convert_flags(file->f_flags);
                 /* can not refresh inode info since size could be stale */
-                rc = cifs_posix_open(full_path, &inode, inode->i_sb,
+                rc = cifs_posix_open(full_path, &inode, file->f_path.mnt,
                                      cifs_sb->mnt_file_mode /* ignored */,
                                      oflags, &oplock, &netfid, xid);
                 if (rc == 0) {
@@ -414,24 +386,17 @@ int cifs_open(struct inode *inode, struct file *file)
                 cFYI(1, ("cifs_open returned 0x%x", rc));
                 goto out;
         }
-        file->private_data =
-                kmalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
+
+        pCifsFile = cifs_new_fileinfo(inode, netfid, file, file->f_path.mnt,
+                                        file->f_flags);
+        file->private_data = pCifsFile;
         if (file->private_data == NULL) {
                 rc = -ENOMEM;
                 goto out;
         }
-        pCifsFile = cifs_init_private(file->private_data, inode, file, netfid);
-        write_lock(&GlobalSMBSeslock);
-        list_add(&pCifsFile->tlist, &tcon->openFileList);
 
-        pCifsInode = CIFS_I(file->f_path.dentry->d_inode);
-        if (pCifsInode) {
-                rc = cifs_open_inode_helper(inode, file, pCifsInode,
-                                            pCifsFile, tcon,
-                                            &oplock, buf, full_path, xid);
-        } else {
-                write_unlock(&GlobalSMBSeslock);
-        }
+        rc = cifs_open_inode_helper(inode, file, pCifsInode, pCifsFile, tcon,
+                                    &oplock, buf, full_path, xid);
 
         if (oplock & CIFS_CREATE_ACTION) {
                 /* time to set mode which we can not set earlier due to
@@ -474,7 +439,8 @@ static int cifs_relock_file(struct cifsFileInfo *cifsFile)
 static int cifs_reopen_file(struct file *file, bool can_flush)
 {
         int rc = -EACCES;
-        int xid, oplock;
+        int xid;
+        __u32 oplock;
         struct cifs_sb_info *cifs_sb;
         struct cifsTconInfo *tcon;
         struct cifsFileInfo *pCifsFile;
@@ -543,7 +509,7 @@ reopen_error_exit:
                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
                 int oflags = (int) cifs_posix_convert_flags(file->f_flags);
                 /* can not refresh inode info since size could be stale */
-                rc = cifs_posix_open(full_path, NULL, inode->i_sb,
+                rc = cifs_posix_open(full_path, NULL, file->f_path.mnt,
                                      cifs_sb->mnt_file_mode /* ignored */,
                                      oflags, &oplock, &netfid, xid);
                 if (rc == 0) {
@@ -2308,6 +2274,73 @@ out:
         return rc;
 }
 
+static void
+cifs_oplock_break(struct slow_work *work)
+{
+        struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo,
+                                                  oplock_break);
+        struct inode *inode = cfile->pInode;
+        struct cifsInodeInfo *cinode = CIFS_I(inode);
+        struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->mnt->mnt_sb);
+        int rc, waitrc = 0;
+
+        if (inode && S_ISREG(inode->i_mode)) {
+#ifdef CONFIG_CIFS_EXPERIMENTAL
+                if (cinode->clientCanCacheAll == 0)
+                        break_lease(inode, FMODE_READ);
+                else if (cinode->clientCanCacheRead == 0)
+                        break_lease(inode, FMODE_WRITE);
+#endif
+                rc = filemap_fdatawrite(inode->i_mapping);
+                if (cinode->clientCanCacheRead == 0) {
+                        waitrc = filemap_fdatawait(inode->i_mapping);
+                        invalidate_remote_inode(inode);
+                }
+                if (!rc)
+                        rc = waitrc;
+                if (rc)
+                        cinode->write_behind_rc = rc;
+                cFYI(1, ("Oplock flush inode %p rc %d", inode, rc));
+        }
+
+        /*
+         * releasing stale oplock after recent reconnect of smb session using
+         * a now incorrect file handle is not a data integrity issue but do
+         * not bother sending an oplock release if session to server still is
+         * disconnected since oplock already released by the server
+         */
+        if (!cfile->closePend && !cfile->oplock_break_cancelled) {
+                rc = CIFSSMBLock(0, cifs_sb->tcon, cfile->netfid, 0, 0, 0, 0,
+                                 LOCKING_ANDX_OPLOCK_RELEASE, false);
+                cFYI(1, ("Oplock release rc = %d", rc));
+        }
+}
+
+static int
+cifs_oplock_break_get(struct slow_work *work)
+{
+        struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo,
+                                                  oplock_break);
+        mntget(cfile->mnt);
+        cifsFileInfo_get(cfile);
+        return 0;
+}
+
+static void
+cifs_oplock_break_put(struct slow_work *work)
+{
+        struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo,
+                                                  oplock_break);
+        mntput(cfile->mnt);
+        cifsFileInfo_put(cfile);
+}
+
+const struct slow_work_ops cifs_oplock_break_ops = {
+        .get_ref        = cifs_oplock_break_get,
+        .put_ref        = cifs_oplock_break_put,
+        .execute        = cifs_oplock_break,
+};
+
 const struct address_space_operations cifs_addr_ops = {
         .readpage = cifs_readpage,
         .readpages = cifs_readpages,
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 1f09c7619319..5e2492535daa 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1557,57 +1557,24 @@ static int cifs_truncate_page(struct address_space *mapping, loff_t from)
 
 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
 {
-        struct address_space *mapping = inode->i_mapping;
-        unsigned long limit;
+        loff_t oldsize;
+        int err;
 
         spin_lock(&inode->i_lock);
-        if (inode->i_size < offset)
-                goto do_expand;
-        /*
-         * truncation of in-use swapfiles is disallowed - it would cause
-         * subsequent swapout to scribble on the now-freed blocks.
-         */
-        if (IS_SWAPFILE(inode)) {
-                spin_unlock(&inode->i_lock);
-                goto out_busy;
-        }
-        i_size_write(inode, offset);
-        spin_unlock(&inode->i_lock);
-        /*
-         * unmap_mapping_range is called twice, first simply for efficiency
-         * so that truncate_inode_pages does fewer single-page unmaps. However
-         * after this first call, and before truncate_inode_pages finishes,
-         * it is possible for private pages to be COWed, which remain after
-         * truncate_inode_pages finishes, hence the second unmap_mapping_range
-         * call must be made for correctness.
-         */
-        unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
-        truncate_inode_pages(mapping, offset);
-        unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
-        goto out_truncate;
-
-do_expand:
-        limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
-        if (limit != RLIM_INFINITY && offset > limit) {
+        err = inode_newsize_ok(inode, offset);
+        if (err) {
                 spin_unlock(&inode->i_lock);
-                goto out_sig;
-        }
-        if (offset > inode->i_sb->s_maxbytes) {
-                spin_unlock(&inode->i_lock);
-                goto out_big;
+                goto out;
         }
+
+        oldsize = inode->i_size;
         i_size_write(inode, offset);
         spin_unlock(&inode->i_lock);
-out_truncate:
+        truncate_pagecache(inode, oldsize, offset);
         if (inode->i_op->truncate)
                 inode->i_op->truncate(inode);
-        return 0;
-out_sig:
-        send_sig(SIGXFSZ, current, 0);
-out_big:
-        return -EFBIG;
-out_busy:
-        return -ETXTBSY;
+out:
+        return err;
 }
 
 static int
diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index e079a9190ec4..0241b25ac33f 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -32,7 +32,6 @@
 
 extern mempool_t *cifs_sm_req_poolp;
 extern mempool_t *cifs_req_poolp;
-extern struct task_struct *oplockThread;
 
 /* The xid serves as a useful identifier for each incoming vfs request,
    in a similar way to the mid which is useful to track each sent smb,
@@ -500,6 +499,7 @@ is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv)
         struct cifsTconInfo *tcon;
         struct cifsInodeInfo *pCifsInode;
         struct cifsFileInfo *netfile;
+        int rc;
 
         cFYI(1, ("Checking for oplock break or dnotify response"));
         if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
@@ -562,30 +562,40 @@ is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv)
                                 continue;
 
                         cifs_stats_inc(&tcon->num_oplock_brks);
-                        write_lock(&GlobalSMBSeslock);
+                        read_lock(&GlobalSMBSeslock);
                         list_for_each(tmp2, &tcon->openFileList) {
                                 netfile = list_entry(tmp2, struct cifsFileInfo,
                                                      tlist);
                                 if (pSMB->Fid != netfile->netfid)
                                         continue;
 
-                                write_unlock(&GlobalSMBSeslock);
-                                read_unlock(&cifs_tcp_ses_lock);
+                                /*
+                                 * don't do anything if file is about to be
+                                 * closed anyway.
+                                 */
+                                if (netfile->closePend) {
+                                        read_unlock(&GlobalSMBSeslock);
+                                        read_unlock(&cifs_tcp_ses_lock);
+                                        return true;
+                                }
+
                                 cFYI(1, ("file id match, oplock break"));
                                 pCifsInode = CIFS_I(netfile->pInode);
                                 pCifsInode->clientCanCacheAll = false;
                                 if (pSMB->OplockLevel == 0)
                                         pCifsInode->clientCanCacheRead = false;
-                                pCifsInode->oplockPending = true;
-                                AllocOplockQEntry(netfile->pInode,
-                                                  netfile->netfid, tcon);
-                                cFYI(1, ("about to wake up oplock thread"));
-                                if (oplockThread)
-                                        wake_up_process(oplockThread);
-
+                                rc = slow_work_enqueue(&netfile->oplock_break);
+                                if (rc) {
+                                        cERROR(1, ("failed to enqueue oplock "
+                                                   "break: %d\n", rc));
+                                } else {
+                                        netfile->oplock_break_cancelled = false;
+                                }
+                                read_unlock(&GlobalSMBSeslock);
+                                read_unlock(&cifs_tcp_ses_lock);
                                 return true;
                         }
-                        write_unlock(&GlobalSMBSeslock);
+                        read_unlock(&GlobalSMBSeslock);
                         read_unlock(&cifs_tcp_ses_lock);
                         cFYI(1, ("No matching file for oplock break"));
                         return true;
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index f823a4a208a7..1f098ca71636 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -146,7 +146,7 @@ cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
         }
 }
 
-void
+static void
 cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
                        struct cifs_sb_info *cifs_sb)
 {
@@ -161,7 +161,7 @@ cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
         cifs_fill_common_info(fattr, cifs_sb);
 }
 
-void
+static void
 cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
                        struct cifs_sb_info *cifs_sb)
 {
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 1da4ab250eae..07b8e71544ee 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -103,56 +103,6 @@ DeleteMidQEntry(struct mid_q_entry *midEntry)
         mempool_free(midEntry, cifs_mid_poolp);
 }
 
-struct oplock_q_entry *
-AllocOplockQEntry(struct inode *pinode, __u16 fid, struct cifsTconInfo *tcon)
-{
-        struct oplock_q_entry *temp;
-        if ((pinode == NULL) || (tcon == NULL)) {
-                cERROR(1, ("Null parms passed to AllocOplockQEntry"));
-                return NULL;
-        }
-        temp = (struct oplock_q_entry *) kmem_cache_alloc(cifs_oplock_cachep,
-                                                       GFP_KERNEL);
-        if (temp == NULL)
-                return temp;
-        else {
-                temp->pinode = pinode;
-                temp->tcon = tcon;
-                temp->netfid = fid;
-                spin_lock(&cifs_oplock_lock);
-                list_add_tail(&temp->qhead, &cifs_oplock_list);
-                spin_unlock(&cifs_oplock_lock);
-        }
-        return temp;
-}
-
-void DeleteOplockQEntry(struct oplock_q_entry *oplockEntry)
-{
-        spin_lock(&cifs_oplock_lock);
-    /* should we check if list empty first? */
-        list_del(&oplockEntry->qhead);
-        spin_unlock(&cifs_oplock_lock);
-        kmem_cache_free(cifs_oplock_cachep, oplockEntry);
-}
-
-
-void DeleteTconOplockQEntries(struct cifsTconInfo *tcon)
-{
-        struct oplock_q_entry *temp;
-
-        if (tcon == NULL)
-                return;
-
-        spin_lock(&cifs_oplock_lock);
-        list_for_each_entry(temp, &cifs_oplock_list, qhead) {
-                if ((temp->tcon) && (temp->tcon == tcon)) {
-                        list_del(&temp->qhead);
-                        kmem_cache_free(cifs_oplock_cachep, temp);
-                }
-        }
-        spin_unlock(&cifs_oplock_lock);
-}
-
 static int
 smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec)
 {
diff --git a/fs/coda/coda_int.h b/fs/coda/coda_int.h
index 8ccd5ed81d9c..d99860a33890 100644
--- a/fs/coda/coda_int.h
+++ b/fs/coda/coda_int.h
@@ -2,6 +2,7 @@
 #define _CODA_INT_
 
 struct dentry;
+struct file;
 
 extern struct file_system_type coda_fs_type;
 extern unsigned long coda_timeout;
diff --git a/fs/coda/psdev.c b/fs/coda/psdev.c
index 0376ac66c44a..be4392ca2098 100644
--- a/fs/coda/psdev.c
+++ b/fs/coda/psdev.c
@@ -22,6 +22,7 @@
 #include <linux/kernel.h>
 #include <linux/major.h>
 #include <linux/time.h>
+#include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/ioport.h>
 #include <linux/fcntl.h>
diff --git a/fs/compat.c b/fs/compat.c
index 6d6f98fe64a0..d576b552e8e2 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -100,13 +100,6 @@ asmlinkage long compat_sys_utimensat(unsigned int dfd, char __user *filename, st
                     get_compat_timespec(&tv[1], &t[1]))
                         return -EFAULT;
 
-                if ((tv[0].tv_nsec == UTIME_OMIT || tv[0].tv_nsec == UTIME_NOW)
-                    && tv[0].tv_sec != 0)
-                        return -EINVAL;
-                if ((tv[1].tv_nsec == UTIME_OMIT || tv[1].tv_nsec == UTIME_NOW)
-                    && tv[1].tv_sec != 0)
-                        return -EINVAL;
-
                 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
                         return 0;
         }
@@ -775,13 +768,13 @@ asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
                                  char __user * type, unsigned long flags,
                                  void __user * data)
 {
-        unsigned long type_page;
+        char *kernel_type;
         unsigned long data_page;
-        unsigned long dev_page;
+        char *kernel_dev;
         char *dir_page;
         int retval;
 
-        retval = copy_mount_options (type, &type_page);
+        retval = copy_mount_string(type, &kernel_type);
         if (retval < 0)
                 goto out;
 
@@ -790,38 +783,38 @@ asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
         if (IS_ERR(dir_page))
                 goto out1;
 
-        retval = copy_mount_options (dev_name, &dev_page);
+        retval = copy_mount_string(dev_name, &kernel_dev);
         if (retval < 0)
                 goto out2;
 
-        retval = copy_mount_options (data, &data_page);
+        retval = copy_mount_options(data, &data_page);
         if (retval < 0)
                 goto out3;
 
         retval = -EINVAL;
 
-        if (type_page && data_page) {
-                if (!strcmp((char *)type_page, SMBFS_NAME)) {
+        if (kernel_type && data_page) {
+                if (!strcmp(kernel_type, SMBFS_NAME)) {
                         do_smb_super_data_conv((void *)data_page);
-                } else if (!strcmp((char *)type_page, NCPFS_NAME)) {
+                } else if (!strcmp(kernel_type, NCPFS_NAME)) {
                         do_ncp_super_data_conv((void *)data_page);
-                } else if (!strcmp((char *)type_page, NFS4_NAME)) {
+                } else if (!strcmp(kernel_type, NFS4_NAME)) {
                         if (do_nfs4_super_data_conv((void *) data_page))
                                 goto out4;
                 }
         }
 
-        retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
+        retval = do_mount(kernel_dev, dir_page, kernel_type,
                         flags, (void*)data_page);
 
  out4:
         free_page(data_page);
  out3:
-        free_page(dev_page);
+        kfree(kernel_dev);
  out2:
         putname(dir_page);
  out1:
-        free_page(type_page);
+        kfree(kernel_type);
  out:
         return retval;
 }
diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index 75efb028974b..d5f8c96964be 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -18,14 +18,13 @@
 #include <linux/mount.h>
 #include <linux/tty.h>
 #include <linux/mutex.h>
+#include <linux/magic.h>
 #include <linux/idr.h>
 #include <linux/devpts_fs.h>
 #include <linux/parser.h>
 #include <linux/fsnotify.h>
 #include <linux/seq_file.h>
 
-#define DEVPTS_SUPER_MAGIC 0x1cd1
-
 #define DEVPTS_DEFAULT_MODE 0600
 /*
  * ptmx is a new node in /dev/pts and will be unused in legacy (single-
diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
index 1d1d27442235..1c8bb8c3a82e 100644
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -386,9 +386,9 @@ static int table_seq_show(struct seq_file *seq, void *iter_ptr)
         return rv;
 }
 
-static struct seq_operations format1_seq_ops;
-static struct seq_operations format2_seq_ops;
-static struct seq_operations format3_seq_ops;
+static const struct seq_operations format1_seq_ops;
+static const struct seq_operations format2_seq_ops;
+static const struct seq_operations format3_seq_ops;
 
 static void *table_seq_start(struct seq_file *seq, loff_t *pos)
 {
@@ -534,21 +534,21 @@ static void table_seq_stop(struct seq_file *seq, void *iter_ptr)
         }
 }
 
-static struct seq_operations format1_seq_ops = {
+static const struct seq_operations format1_seq_ops = {
         .start = table_seq_start,
         .next  = table_seq_next,
         .stop  = table_seq_stop,
         .show  = table_seq_show,
 };
 
-static struct seq_operations format2_seq_ops = {
+static const struct seq_operations format2_seq_ops = {
         .start = table_seq_start,
         .next  = table_seq_next,
         .stop  = table_seq_stop,
         .show  = table_seq_show,
 };
 
-static struct seq_operations format3_seq_ops = {
+static const struct seq_operations format3_seq_ops = {
         .start = table_seq_start,
         .next  = table_seq_next,
         .stop  = table_seq_stop,
diff --git a/fs/drop_caches.c b/fs/drop_caches.c
index a2edb7913447..31f4b0e6d72c 100644
--- a/fs/drop_caches.c
+++ b/fs/drop_caches.c
@@ -63,9 +63,9 @@ static void drop_slab(void)
 }
 
 int drop_caches_sysctl_handler(ctl_table *table, int write,
-        struct file *file, void __user *buffer, size_t *length, loff_t *ppos)
+        void __user *buffer, size_t *length, loff_t *ppos)
 {
-        proc_dointvec_minmax(table, write, file, buffer, length, ppos);
+        proc_dointvec_minmax(table, write, buffer, length, ppos);
         if (write) {
                 if (sysctl_drop_caches & 1)
                         drop_pagecache();
diff --git a/fs/ecryptfs/Kconfig b/fs/ecryptfs/Kconfig
index 0c754e64232b..8aadb99b7634 100644
--- a/fs/ecryptfs/Kconfig
+++ b/fs/ecryptfs/Kconfig
@@ -1,6 +1,8 @@
 config ECRYPT_FS
         tristate "eCrypt filesystem layer support (EXPERIMENTAL)"
-        depends on EXPERIMENTAL && KEYS && CRYPTO && NET
+        depends on EXPERIMENTAL && KEYS && NET
+        select CRYPTO_ECB
+        select CRYPTO_CBC
         help
           Encrypted filesystem that operates on the VFS layer.  See
           <file:Documentation/filesystems/ecryptfs.txt> to learn more about
diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index b91851f1cda3..fbb6e5eed697 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -245,13 +245,11 @@ void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat)
                 crypto_free_blkcipher(crypt_stat->tfm);
         if (crypt_stat->hash_tfm)
                 crypto_free_hash(crypt_stat->hash_tfm);
-        mutex_lock(&crypt_stat->keysig_list_mutex);
         list_for_each_entry_safe(key_sig, key_sig_tmp,
                                  &crypt_stat->keysig_list, crypt_stat_list) {
                 list_del(&key_sig->crypt_stat_list);
                 kmem_cache_free(ecryptfs_key_sig_cache, key_sig);
         }
-        mutex_unlock(&crypt_stat->keysig_list_mutex);
         memset(crypt_stat, 0, sizeof(struct ecryptfs_crypt_stat));
 }
 
@@ -511,13 +509,14 @@ int ecryptfs_encrypt_page(struct page *page)
                                   + extent_offset), crypt_stat);
                 rc = ecryptfs_write_lower(ecryptfs_inode, enc_extent_virt,
                                           offset, crypt_stat->extent_size);
-                if (rc) {
+                if (rc < 0) {
                         ecryptfs_printk(KERN_ERR, "Error attempting "
                                         "to write lower page; rc = [%d]"
                                         "\n", rc);
                         goto out;
                 }
         }
+        rc = 0;
 out:
         if (enc_extent_page) {
                 kunmap(enc_extent_page);
@@ -633,7 +632,7 @@ int ecryptfs_decrypt_page(struct page *page)
                 rc = ecryptfs_read_lower(enc_extent_virt, offset,
                                          crypt_stat->extent_size,
                                          ecryptfs_inode);
-                if (rc) {
+                if (rc < 0) {
                         ecryptfs_printk(KERN_ERR, "Error attempting "
                                         "to read lower page; rc = [%d]"
                                         "\n", rc);
@@ -797,6 +796,7 @@ int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat)
         kfree(full_alg_name);
         if (IS_ERR(crypt_stat->tfm)) {
                 rc = PTR_ERR(crypt_stat->tfm);
+                crypt_stat->tfm = NULL;
                 ecryptfs_printk(KERN_ERR, "cryptfs: init_crypt_ctx(): "
                                 "Error initializing cipher [%s]\n",
                                 crypt_stat->cipher);
@@ -925,7 +925,9 @@ static int ecryptfs_copy_mount_wide_sigs_to_inode_sigs(
         struct ecryptfs_global_auth_tok *global_auth_tok;
         int rc = 0;
 
+        mutex_lock(&crypt_stat->keysig_list_mutex);
         mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex);
+
         list_for_each_entry(global_auth_tok,
                             &mount_crypt_stat->global_auth_tok_list,
                             mount_crypt_stat_list) {
@@ -934,13 +936,13 @@ static int ecryptfs_copy_mount_wide_sigs_to_inode_sigs(
                 rc = ecryptfs_add_keysig(crypt_stat, global_auth_tok->sig);
                 if (rc) {
                         printk(KERN_ERR "Error adding keysig; rc = [%d]\n", rc);
-                        mutex_unlock(
-                                &mount_crypt_stat->global_auth_tok_list_mutex);
                         goto out;
                 }
         }
-        mutex_unlock(&mount_crypt_stat->global_auth_tok_list_mutex);
+
 out:
+        mutex_unlock(&mount_crypt_stat->global_auth_tok_list_mutex);
+        mutex_unlock(&crypt_stat->keysig_list_mutex);
         return rc;
 }
 
@@ -1212,14 +1214,15 @@ int ecryptfs_read_and_validate_header_region(char *data,
                 crypt_stat->extent_size = ECRYPTFS_DEFAULT_EXTENT_SIZE;
         rc = ecryptfs_read_lower(data, 0, crypt_stat->extent_size,
                                  ecryptfs_inode);
-        if (rc) {
+        if (rc < 0) {
                 printk(KERN_ERR "%s: Error reading header region; rc = [%d]\n",
                        __func__, rc);
                 goto out;
         }
         if (!contains_ecryptfs_marker(data + ECRYPTFS_FILE_SIZE_BYTES)) {
                 rc = -EINVAL;
-        }
+        } else
+                rc = 0;
 out:
         return rc;
 }
@@ -1314,10 +1317,11 @@ ecryptfs_write_metadata_to_contents(struct dentry *ecryptfs_dentry,
 
         rc = ecryptfs_write_lower(ecryptfs_dentry->d_inode, virt,
                                   0, virt_len);
-        if (rc)
+        if (rc < 0)
                 printk(KERN_ERR "%s: Error attempting to write header "
-                       "information to lower file; rc = [%d]\n", __func__,
-                       rc);
+                       "information to lower file; rc = [%d]\n", __func__, rc);
+        else
+                rc = 0;
         return rc;
 }
 
@@ -1597,7 +1601,7 @@ int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry)
         }
         rc = ecryptfs_read_lower(page_virt, 0, crypt_stat->extent_size,
                                  ecryptfs_inode);
-        if (!rc)
+        if (rc >= 0)
                 rc = ecryptfs_read_headers_virt(page_virt, crypt_stat,
                                                 ecryptfs_dentry,
                                                 ECRYPTFS_VALIDATE_HEADER_SIZE);
@@ -1702,7 +1706,7 @@ ecryptfs_encrypt_filename(struct ecryptfs_filename *filename,
         } else {
                 printk(KERN_ERR "%s: No support for requested filename "
                        "encryption method in this release\n", __func__);
-                rc = -ENOTSUPP;
+                rc = -EOPNOTSUPP;
                 goto out;
         }
 out:
@@ -1763,7 +1767,7 @@ ecryptfs_process_key_cipher(struct crypto_blkcipher **key_tfm,
         if (IS_ERR(*key_tfm)) {
                 rc = PTR_ERR(*key_tfm);
                 printk(KERN_ERR "Unable to allocate crypto cipher with name "
-                       "[%s]; rc = [%d]\n", cipher_name, rc);
+                       "[%s]; rc = [%d]\n", full_alg_name, rc);
                 goto out;
         }
         crypto_blkcipher_set_flags(*key_tfm, CRYPTO_TFM_REQ_WEAK_KEY);
@@ -1776,7 +1780,8 @@ ecryptfs_process_key_cipher(struct crypto_blkcipher **key_tfm,
         rc = crypto_blkcipher_setkey(*key_tfm, dummy_key, *key_size);
         if (rc) {
                 printk(KERN_ERR "Error attempting to set key of size [%zd] for "
-                       "cipher [%s]; rc = [%d]\n", *key_size, cipher_name, rc);
+                       "cipher [%s]; rc = [%d]\n", *key_size, full_alg_name,
+                       rc);
                 rc = -EINVAL;
                 goto out;
         }
@@ -2166,7 +2171,7 @@ int ecryptfs_encrypt_and_encode_filename(
                         (*encoded_name)[(*encoded_name_size)] = '\0';
                         (*encoded_name_size)++;
                 } else {
-                        rc = -ENOTSUPP;
+                        rc = -EOPNOTSUPP;
                 }
                 if (rc) {
                         printk(KERN_ERR "%s: Error attempting to encode "
diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index 00b30a2d5466..542f625312f3 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -582,7 +582,7 @@ extern const struct inode_operations ecryptfs_dir_iops;
 extern const struct inode_operations ecryptfs_symlink_iops;
 extern const struct super_operations ecryptfs_sops;
 extern const struct dentry_operations ecryptfs_dops;
-extern struct address_space_operations ecryptfs_aops;
+extern const struct address_space_operations ecryptfs_aops;
 extern int ecryptfs_verbosity;
 extern unsigned int ecryptfs_message_buf_len;
 extern signed long ecryptfs_message_wait_timeout;
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 2f0945d63297..056fed62d0de 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -476,6 +476,7 @@ static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
         struct dentry *lower_dir_dentry;
 
+        dget(lower_dentry);
         lower_dir_dentry = lock_parent(lower_dentry);
         rc = vfs_unlink(lower_dir_inode, lower_dentry);
         if (rc) {
@@ -489,6 +490,7 @@ static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
         d_drop(dentry);
 out_unlock:
         unlock_dir(lower_dir_dentry);
+        dput(lower_dentry);
         return rc;
 }
 
diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c
index 259525c9abb8..a0a7847567e9 100644
--- a/fs/ecryptfs/keystore.c
+++ b/fs/ecryptfs/keystore.c
@@ -416,7 +416,9 @@ ecryptfs_find_global_auth_tok_for_sig(
                             &mount_crypt_stat->global_auth_tok_list,
                             mount_crypt_stat_list) {
                 if (memcmp(walker->sig, sig, ECRYPTFS_SIG_SIZE_HEX) == 0) {
-                        (*global_auth_tok) = walker;
+                        rc = key_validate(walker->global_auth_tok_key);
+                        if (!rc)
+                                (*global_auth_tok) = walker;
                         goto out;
                 }
         }
@@ -612,7 +614,12 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
         }
         /* TODO: Support other key modules than passphrase for
          * filename encryption */
-        BUG_ON(s->auth_tok->token_type != ECRYPTFS_PASSWORD);
+        if (s->auth_tok->token_type != ECRYPTFS_PASSWORD) {
+                rc = -EOPNOTSUPP;
+                printk(KERN_INFO "%s: Filename encryption only supports "
+                       "password tokens\n", __func__);
+                goto out_free_unlock;
+        }
         sg_init_one(
                 &s->hash_sg,
                 (u8 *)s->auth_tok->token.password.session_key_encryption_key,
@@ -910,7 +917,12 @@ ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
         }
         /* TODO: Support other key modules than passphrase for
          * filename encryption */
-        BUG_ON(s->auth_tok->token_type != ECRYPTFS_PASSWORD);
+        if (s->auth_tok->token_type != ECRYPTFS_PASSWORD) {
+                rc = -EOPNOTSUPP;
+                printk(KERN_INFO "%s: Filename encryption only supports "
+                       "password tokens\n", __func__);
+                goto out_free_unlock;
+        }
         rc = crypto_blkcipher_setkey(
                 s->desc.tfm,
                 s->auth_tok->token.password.session_key_encryption_key,
@@ -1316,8 +1328,10 @@ parse_tag_3_packet(struct ecryptfs_crypt_stat *crypt_stat,
                 rc = -EINVAL;
                 goto out_free;
         }
-        ecryptfs_cipher_code_to_string(crypt_stat->cipher,
-                                       (u16)data[(*packet_size)]);
+        rc = ecryptfs_cipher_code_to_string(crypt_stat->cipher,
+                                            (u16)data[(*packet_size)]);
+        if (rc)
+                goto out_free;
         /* A little extra work to differentiate among the AES key
          * sizes; see RFC2440 */
         switch(data[(*packet_size)++]) {
@@ -1328,7 +1342,9 @@ parse_tag_3_packet(struct ecryptfs_crypt_stat *crypt_stat,
                 crypt_stat->key_size =
                         (*new_auth_tok)->session_key.encrypted_key_size;
         }
-        ecryptfs_init_crypt_ctx(crypt_stat);
+        rc = ecryptfs_init_crypt_ctx(crypt_stat);
+        if (rc)
+                goto out_free;
         if (unlikely(data[(*packet_size)++] != 0x03)) {
                 printk(KERN_WARNING "Only S2K ID 3 is currently supported\n");
                 rc = -ENOSYS;
@@ -2366,21 +2382,18 @@ struct kmem_cache *ecryptfs_key_sig_cache;
 int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig)
 {
         struct ecryptfs_key_sig *new_key_sig;
-        int rc = 0;
 
         new_key_sig = kmem_cache_alloc(ecryptfs_key_sig_cache, GFP_KERNEL);
         if (!new_key_sig) {
-                rc = -ENOMEM;
                 printk(KERN_ERR
                        "Error allocating from ecryptfs_key_sig_cache\n");
-                goto out;
+                return -ENOMEM;
         }
         memcpy(new_key_sig->keysig, sig, ECRYPTFS_SIG_SIZE_HEX);
-        mutex_lock(&crypt_stat->keysig_list_mutex);
+        /* Caller must hold keysig_list_mutex */
         list_add(&new_key_sig->crypt_stat_list, &crypt_stat->keysig_list);
-        mutex_unlock(&crypt_stat->keysig_list_mutex);
-out:
-        return rc;
+
+        return 0;
 }
 
 struct kmem_cache *ecryptfs_global_auth_tok_cache;
diff --git a/fs/ecryptfs/kthread.c b/fs/ecryptfs/kthread.c
index c6d7a4d748a0..e14cf7e588db 100644
--- a/fs/ecryptfs/kthread.c
+++ b/fs/ecryptfs/kthread.c
@@ -136,6 +136,7 @@ int ecryptfs_privileged_open(struct file **lower_file,
                              const struct cred *cred)
 {
         struct ecryptfs_open_req *req;
+        int flags = O_LARGEFILE;
         int rc = 0;
 
         /* Corresponding dput() and mntput() are done when the
@@ -143,10 +144,14 @@ int ecryptfs_privileged_open(struct file **lower_file,
          * destroyed. */
         dget(lower_dentry);
         mntget(lower_mnt);
-        (*lower_file) = dentry_open(lower_dentry, lower_mnt,
-                                    (O_RDWR | O_LARGEFILE), cred);
+        flags |= IS_RDONLY(lower_dentry->d_inode) ? O_RDONLY : O_RDWR;
+        (*lower_file) = dentry_open(lower_dentry, lower_mnt, flags, cred);
         if (!IS_ERR(*lower_file))
                 goto out;
+        if (flags & O_RDONLY) {
+                rc = PTR_ERR((*lower_file));
+                goto out;
+        }
         req = kmem_cache_alloc(ecryptfs_open_req_cache, GFP_KERNEL);
         if (!req) {
                 rc = -ENOMEM;
@@ -180,21 +185,8 @@ int ecryptfs_privileged_open(struct file **lower_file,
                        __func__);
                 goto out_unlock;
         }
-        if (IS_ERR(*req->lower_file)) {
+        if (IS_ERR(*req->lower_file))
                 rc = PTR_ERR(*req->lower_file);
-                dget(lower_dentry);
-                mntget(lower_mnt);
-                (*lower_file) = dentry_open(lower_dentry, lower_mnt,
-                                            (O_RDONLY | O_LARGEFILE), cred);
-                if (IS_ERR(*lower_file)) {
-                        rc = PTR_ERR(*req->lower_file);
-                        (*lower_file) = NULL;
-                        printk(KERN_WARNING "%s: Error attempting privileged "
-                               "open of lower file with either RW or RO "
-                               "perms; rc = [%d]. Giving up.\n",
-                               __func__, rc);
-                }
-        }
 out_unlock:
         mutex_unlock(&req->mux);
 out_free:
diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index 9f0aa9883c28..101fe4c7b1ee 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -129,11 +129,10 @@ int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry)
                 lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
                 rc = ecryptfs_privileged_open(&inode_info->lower_file,
                                               lower_dentry, lower_mnt, cred);
-                if (rc || IS_ERR(inode_info->lower_file)) {
+                if (rc) {
                         printk(KERN_ERR "Error opening lower persistent file "
                                "for lower_dentry [0x%p] and lower_mnt [0x%p]; "
                                "rc = [%d]\n", lower_dentry, lower_mnt, rc);
-                        rc = PTR_ERR(inode_info->lower_file);
                         inode_info->lower_file = NULL;
                 }
         }
diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index 5c6bab9786e3..df4ce99d0597 100644
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -396,9 +396,11 @@ static int ecryptfs_write_inode_size_to_header(struct inode *ecryptfs_inode)
         rc = ecryptfs_write_lower(ecryptfs_inode, file_size_virt, 0,
                                   sizeof(u64));
         kfree(file_size_virt);
-        if (rc)
+        if (rc < 0)
                 printk(KERN_ERR "%s: Error writing file size to header; "
                        "rc = [%d]\n", __func__, rc);
+        else
+                rc = 0;
 out:
         return rc;
 }
@@ -545,7 +547,7 @@ static sector_t ecryptfs_bmap(struct address_space *mapping, sector_t block)
         return rc;
 }
 
-struct address_space_operations ecryptfs_aops = {
+const struct address_space_operations ecryptfs_aops = {
         .writepage = ecryptfs_writepage,
         .readpage = ecryptfs_readpage,
         .write_begin = ecryptfs_write_begin,
diff --git a/fs/ecryptfs/read_write.c b/fs/ecryptfs/read_write.c
index a137c6ea2fee..0cc4fafd6552 100644
--- a/fs/ecryptfs/read_write.c
+++ b/fs/ecryptfs/read_write.c
@@ -34,15 +34,14 @@
  *
  * Write data to the lower file.
  *
- * Returns zero on success; non-zero on error
+ * Returns bytes written on success; less than zero on error
  */
 int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
                          loff_t offset, size_t size)
 {
         struct ecryptfs_inode_info *inode_info;
-        ssize_t octets_written;
         mm_segment_t fs_save;
-        int rc = 0;
+        ssize_t rc;
 
         inode_info = ecryptfs_inode_to_private(ecryptfs_inode);
         mutex_lock(&inode_info->lower_file_mutex);
@@ -50,14 +49,9 @@ int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
         inode_info->lower_file->f_pos = offset;
         fs_save = get_fs();
         set_fs(get_ds());
-        octets_written = vfs_write(inode_info->lower_file, data, size,
-                                   &inode_info->lower_file->f_pos);
+        rc = vfs_write(inode_info->lower_file, data, size,
+                       &inode_info->lower_file->f_pos);
         set_fs(fs_save);
-        if (octets_written < 0) {
-                printk(KERN_ERR "%s: octets_written = [%td]; "
-                       "expected [%td]\n", __func__, octets_written, size);
-                rc = -EINVAL;
-        }
         mutex_unlock(&inode_info->lower_file_mutex);
         mark_inode_dirty_sync(ecryptfs_inode);
         return rc;
@@ -91,6 +85,8 @@ int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
                   + offset_in_page);
         virt = kmap(page_for_lower);
         rc = ecryptfs_write_lower(ecryptfs_inode, virt, offset, size);
+        if (rc > 0)
+                rc = 0;
         kunmap(page_for_lower);
         return rc;
 }
@@ -229,30 +225,24 @@ out:
  * Read @size bytes of data at byte offset @offset from the lower
  * inode into memory location @data.
  *
- * Returns zero on success; non-zero on error
+ * Returns bytes read on success; 0 on EOF; less than zero on error
  */
 int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
                         struct inode *ecryptfs_inode)
 {
         struct ecryptfs_inode_info *inode_info =
                 ecryptfs_inode_to_private(ecryptfs_inode);
-        ssize_t octets_read;
         mm_segment_t fs_save;
-        int rc = 0;
+        ssize_t rc;
 
         mutex_lock(&inode_info->lower_file_mutex);
         BUG_ON(!inode_info->lower_file);
         inode_info->lower_file->f_pos = offset;
         fs_save = get_fs();
         set_fs(get_ds());
-        octets_read = vfs_read(inode_info->lower_file, data, size,
-                               &inode_info->lower_file->f_pos);
+        rc = vfs_read(inode_info->lower_file, data, size,
+                      &inode_info->lower_file->f_pos);
         set_fs(fs_save);
-        if (octets_read < 0) {
-                printk(KERN_ERR "%s: octets_read = [%td]; "
-                       "expected [%td]\n", __func__, octets_read, size);
-                rc = -EINVAL;
-        }
         mutex_unlock(&inode_info->lower_file_mutex);
         return rc;
 }
@@ -284,6 +274,8 @@ int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
         offset = ((((loff_t)page_index) << PAGE_CACHE_SHIFT) + offset_in_page);
         virt = kmap(page_for_ecryptfs);
         rc = ecryptfs_read_lower(virt, offset, size, ecryptfs_inode);
+        if (rc > 0)
+                rc = 0;
         kunmap(page_for_ecryptfs);
         flush_dcache_page(page_for_ecryptfs);
         return rc;
diff --git a/fs/ecryptfs/super.c b/fs/ecryptfs/super.c
index 12d649602d3a..b15a43a80ab7 100644
--- a/fs/ecryptfs/super.c
+++ b/fs/ecryptfs/super.c
@@ -77,7 +77,6 @@ static void ecryptfs_destroy_inode(struct inode *inode)
         struct ecryptfs_inode_info *inode_info;
 
         inode_info = ecryptfs_inode_to_private(inode);
-        mutex_lock(&inode_info->lower_file_mutex);
         if (inode_info->lower_file) {
                 struct dentry *lower_dentry =
                         inode_info->lower_file->f_dentry;
@@ -89,7 +88,6 @@ static void ecryptfs_destroy_inode(struct inode *inode)
                         d_drop(lower_dentry);
                 }
         }
-        mutex_unlock(&inode_info->lower_file_mutex);
         ecryptfs_destroy_crypt_stat(&inode_info->crypt_stat);
         kmem_cache_free(ecryptfs_inode_info_cache, inode_info);
 }
diff --git a/fs/eventfd.c b/fs/eventfd.c
index 31d12de83a2a..8b47e4200e65 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -68,11 +68,16 @@ int eventfd_signal(struct eventfd_ctx *ctx, int n)
 }
 EXPORT_SYMBOL_GPL(eventfd_signal);
 
+static void eventfd_free_ctx(struct eventfd_ctx *ctx)
+{
+        kfree(ctx);
+}
+
 static void eventfd_free(struct kref *kref)
 {
         struct eventfd_ctx *ctx = container_of(kref, struct eventfd_ctx, kref);
 
-        kfree(ctx);
+        eventfd_free_ctx(ctx);
 }
 
 /**
@@ -298,9 +303,23 @@ struct eventfd_ctx *eventfd_ctx_fileget(struct file *file)
 }
 EXPORT_SYMBOL_GPL(eventfd_ctx_fileget);
 
-SYSCALL_DEFINE2(eventfd2, unsigned int, count, int, flags)
+/**
+ * eventfd_file_create - Creates an eventfd file pointer.
+ * @count: Initial eventfd counter value.
+ * @flags: Flags for the eventfd file.
+ *
+ * This function creates an eventfd file pointer, w/out installing it into
+ * the fd table. This is useful when the eventfd file is used during the
+ * initialization of data structures that require extra setup after the eventfd
+ * creation. So the eventfd creation is split into the file pointer creation
+ * phase, and the file descriptor installation phase.
+ * In this way races with userspace closing the newly installed file descriptor
+ * can be avoided.
+ * Returns an eventfd file pointer, or a proper error pointer.
+ */
+struct file *eventfd_file_create(unsigned int count, int flags)
 {
-        int fd;
+        struct file *file;
         struct eventfd_ctx *ctx;
 
         /* Check the EFD_* constants for consistency.  */
@@ -308,26 +327,48 @@ SYSCALL_DEFINE2(eventfd2, unsigned int, count, int, flags)
         BUILD_BUG_ON(EFD_NONBLOCK != O_NONBLOCK);
 
         if (flags & ~EFD_FLAGS_SET)
-                return -EINVAL;
+                return ERR_PTR(-EINVAL);
 
         ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
         if (!ctx)
-                return -ENOMEM;
+                return ERR_PTR(-ENOMEM);
 
         kref_init(&ctx->kref);
         init_waitqueue_head(&ctx->wqh);
         ctx->count = count;
         ctx->flags = flags;
 
-        /*
-         * When we call this, the initialization must be complete, since
-         * anon_inode_getfd() will install the fd.
-         */
-        fd = anon_inode_getfd("[eventfd]", &eventfd_fops, ctx,
-                              flags & EFD_SHARED_FCNTL_FLAGS);
-        if (fd < 0)
-                kfree(ctx);
+        file = anon_inode_getfile("[eventfd]", &eventfd_fops, ctx,
+                                  flags & EFD_SHARED_FCNTL_FLAGS);
+        if (IS_ERR(file))
+                eventfd_free_ctx(ctx);
+
+        return file;
+}
+
+SYSCALL_DEFINE2(eventfd2, unsigned int, count, int, flags)
+{
+        int fd, error;
+        struct file *file;
+
+        error = get_unused_fd_flags(flags & EFD_SHARED_FCNTL_FLAGS);
+        if (error < 0)
+                return error;
+        fd = error;
+
+        file = eventfd_file_create(count, flags);
+        if (IS_ERR(file)) {
+                error = PTR_ERR(file);
+                goto err_put_unused_fd;
+        }
+        fd_install(fd, file);
+
         return fd;
+
+err_put_unused_fd:
+        put_unused_fd(fd);
+
+        return error;
 }
 
 SYSCALL_DEFINE1(eventfd, unsigned int, count)
diff --git a/fs/exec.c b/fs/exec.c
index 172ceb6edde4..d49be6bc1793 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -33,7 +33,7 @@
 #include <linux/string.h>
 #include <linux/init.h>
 #include <linux/pagemap.h>
-#include <linux/perf_counter.h>
+#include <linux/perf_event.h>
 #include <linux/highmem.h>
 #include <linux/spinlock.h>
 #include <linux/key.h>
@@ -55,6 +55,7 @@
 #include <linux/kmod.h>
 #include <linux/fsnotify.h>
 #include <linux/fs_struct.h>
+#include <linux/pipe_fs_i.h>
 
 #include <asm/uaccess.h>
 #include <asm/mmu_context.h>
@@ -63,6 +64,7 @@
 
 int core_uses_pid;
 char core_pattern[CORENAME_MAX_SIZE] = "core";
+unsigned int core_pipe_limit;
 int suid_dumpable = 0;
 
 /* The maximal length of core_pattern is also specified in sysctl.c */
@@ -845,6 +847,9 @@ static int de_thread(struct task_struct *tsk)
         sig->notify_count = 0;
 
 no_thread_group:
+        if (current->mm)
+                setmax_mm_hiwater_rss(&sig->maxrss, current->mm);
+
         exit_itimers(sig);
         flush_itimer_signals();
 
@@ -923,7 +928,7 @@ void set_task_comm(struct task_struct *tsk, char *buf)
         task_lock(tsk);
         strlcpy(tsk->comm, buf, sizeof(tsk->comm));
         task_unlock(tsk);
-        perf_counter_comm(tsk);
+        perf_event_comm(tsk);
 }
 
 int flush_old_exec(struct linux_binprm * bprm)
@@ -997,7 +1002,7 @@ int flush_old_exec(struct linux_binprm * bprm)
          * security domain:
          */
         if (!get_dumpable(current->mm))
-                perf_counter_exit_task(current);
+                perf_event_exit_task(current);
 
         /* An exec changes our domain. We are no longer part of the thread
            group */
@@ -1354,6 +1359,8 @@ int do_execve(char * filename,
         if (retval < 0)
                 goto out;
 
+        current->stack_start = current->mm->start_stack;
+
         /* execve succeeded */
         current->fs->in_exec = 0;
         current->in_execve = 0;
@@ -1388,18 +1395,16 @@ out_ret:
         return retval;
 }
 
-int set_binfmt(struct linux_binfmt *new)
+void set_binfmt(struct linux_binfmt *new)
 {
-        struct linux_binfmt *old = current->binfmt;
+        struct mm_struct *mm = current->mm;
 
-        if (new) {
-                if (!try_module_get(new->module))
-                        return -1;
-        }
-        current->binfmt = new;
-        if (old)
-                module_put(old->module);
-        return 0;
+        if (mm->binfmt)
+                module_put(mm->binfmt->module);
+
+        mm->binfmt = new;
+        if (new)
+                __module_get(new->module);
 }
 
 EXPORT_SYMBOL(set_binfmt);
@@ -1723,6 +1728,29 @@ int get_dumpable(struct mm_struct *mm)
         return (ret >= 2) ? 2 : ret;
 }
 
+static void wait_for_dump_helpers(struct file *file)
+{
+        struct pipe_inode_info *pipe;
+
+        pipe = file->f_path.dentry->d_inode->i_pipe;
+
+        pipe_lock(pipe);
+        pipe->readers++;
+        pipe->writers--;
+
+        while ((pipe->readers > 1) && (!signal_pending(current))) {
+                wake_up_interruptible_sync(&pipe->wait);
+                kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
+                pipe_wait(pipe);
+        }
+
+        pipe->readers--;
+        pipe->writers++;
+        pipe_unlock(pipe);
+
+}
+
+
 void do_coredump(long signr, int exit_code, struct pt_regs *regs)
 {
         struct core_state core_state;
@@ -1739,11 +1767,12 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
         unsigned long core_limit = current->signal->rlim[RLIMIT_CORE].rlim_cur;
         char **helper_argv = NULL;
         int helper_argc = 0;
-        char *delimit;
+        int dump_count = 0;
+        static atomic_t core_dump_count = ATOMIC_INIT(0);
 
         audit_core_dumps(signr);
 
-        binfmt = current->binfmt;
+        binfmt = mm->binfmt;
         if (!binfmt || !binfmt->core_dump)
                 goto fail;
 
@@ -1794,54 +1823,63 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
         lock_kernel();
         ispipe = format_corename(corename, signr);
         unlock_kernel();
-        /*
-         * Don't bother to check the RLIMIT_CORE value if core_pattern points
-         * to a pipe.  Since we're not writing directly to the filesystem
-         * RLIMIT_CORE doesn't really apply, as no actual core file will be
-         * created unless the pipe reader choses to write out the core file
-         * at which point file size limits and permissions will be imposed
-         * as it does with any other process
-         */
+
         if ((!ispipe) && (core_limit < binfmt->min_coredump))
                 goto fail_unlock;
 
         if (ispipe) {
+                if (core_limit == 0) {
+                        /*
+                         * Normally core limits are irrelevant to pipes, since
+                         * we're not writing to the file system, but we use
+                         * core_limit of 0 here as a speacial value. Any
+                         * non-zero limit gets set to RLIM_INFINITY below, but
+                         * a limit of 0 skips the dump.  This is a consistent
+                         * way to catch recursive crashes.  We can still crash
+                         * if the core_pattern binary sets RLIM_CORE =  !0
+                         * but it runs as root, and can do lots of stupid things
+                         * Note that we use task_tgid_vnr here to grab the pid
+                         * of the process group leader.  That way we get the
+                         * right pid if a thread in a multi-threaded
+                         * core_pattern process dies.
+                         */
+                        printk(KERN_WARNING
+                                "Process %d(%s) has RLIMIT_CORE set to 0\n",
+                                task_tgid_vnr(current), current->comm);
+                        printk(KERN_WARNING "Aborting core\n");
+                        goto fail_unlock;
+                }
+
+                dump_count = atomic_inc_return(&core_dump_count);
+                if (core_pipe_limit && (core_pipe_limit < dump_count)) {
+                        printk(KERN_WARNING "Pid %d(%s) over core_pipe_limit\n",
+                               task_tgid_vnr(current), current->comm);
+                        printk(KERN_WARNING "Skipping core dump\n");
+                        goto fail_dropcount;
+                }
+
                 helper_argv = argv_split(GFP_KERNEL, corename+1, &helper_argc);
                 if (!helper_argv) {
                         printk(KERN_WARNING "%s failed to allocate memory\n",
                                __func__);
-                        goto fail_unlock;
-                }
-                /* Terminate the string before the first option */
-                delimit = strchr(corename, ' ');
-                if (delimit)
-                        *delimit = '\0';
-                delimit = strrchr(helper_argv[0], '/');
-                if (delimit)
-                        delimit++;
-                else
-                        delimit = helper_argv[0];
-                if (!strcmp(delimit, current->comm)) {
-                        printk(KERN_NOTICE "Recursive core dump detected, "
-                                        "aborting\n");
-                        goto fail_unlock;
+                        goto fail_dropcount;
                 }
 
                 core_limit = RLIM_INFINITY;
 
                 /* SIGPIPE can happen, but it's just never processed */
-                if (call_usermodehelper_pipe(corename+1, helper_argv, NULL,
+                if (call_usermodehelper_pipe(helper_argv[0], helper_argv, NULL,
                                 &file)) {
                         printk(KERN_INFO "Core dump to %s pipe failed\n",
                                corename);
-                        goto fail_unlock;
+                        goto fail_dropcount;
                 }
         } else
                 file = filp_open(corename,
                                  O_CREAT | 2 | O_NOFOLLOW | O_LARGEFILE | flag,
                                  0600);
         if (IS_ERR(file))
-                goto fail_unlock;
+                goto fail_dropcount;
         inode = file->f_path.dentry->d_inode;
         if (inode->i_nlink > 1)
                 goto close_fail;        /* multiple links - don't dump */
@@ -1870,7 +1908,12 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
         if (retval)
                 current->signal->group_exit_code |= 0x80;
 close_fail:
+        if (ispipe && core_pipe_limit)
+                wait_for_dump_helpers(file);
         filp_close(file, NULL);
+fail_dropcount:
+        if (dump_count)
+                atomic_dec(&core_dump_count);
 fail_unlock:
         if (helper_argv)
                 argv_free(helper_argv);
diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index 5ab10c3bbebe..9f500dec3b59 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -214,7 +214,6 @@ int exofs_sync_fs(struct super_block *sb, int wait)
         }
 
         lock_super(sb);
-        lock_kernel();
         sbi = sb->s_fs_info;
         fscb->s_nextid = cpu_to_le64(sbi->s_nextid);
         fscb->s_numfiles = cpu_to_le32(sbi->s_numfiles);
@@ -245,7 +244,6 @@ int exofs_sync_fs(struct super_block *sb, int wait)
 out:
         if (or)
                 osd_end_request(or);
-        unlock_kernel();
         unlock_super(sb);
         kfree(fscb);
         return ret;
@@ -268,8 +266,6 @@ static void exofs_put_super(struct super_block *sb)
         int num_pend;
         struct exofs_sb_info *sbi = sb->s_fs_info;
 
-        lock_kernel();
-
         if (sb->s_dirt)
                 exofs_write_super(sb);
 
@@ -286,8 +282,6 @@ static void exofs_put_super(struct super_block *sb)
         osduld_put_device(sbi->s_dev);
         kfree(sb->s_fs_info);
         sb->s_fs_info = NULL;
-
-        unlock_kernel();
 }
 
 /*
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 1c1638f873a4..ade634076d0a 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -819,6 +819,7 @@ const struct address_space_operations ext2_aops = {
         .writepages             = ext2_writepages,
         .migratepage            = buffer_migrate_page,
         .is_partially_uptodate  = block_is_partially_uptodate,
+        .error_remove_page      = generic_error_remove_page,
 };
 
 const struct address_space_operations ext2_aops_xip = {
@@ -837,6 +838,7 @@ const struct address_space_operations ext2_nobh_aops = {
         .direct_IO              = ext2_direct_IO,
         .writepages             = ext2_writepages,
         .migratepage            = buffer_migrate_page,
+        .error_remove_page      = generic_error_remove_page,
 };
 
 /*
diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c
index 23701f289e98..dd7175ce5606 100644
--- a/fs/ext2/namei.c
+++ b/fs/ext2/namei.c
@@ -70,7 +70,7 @@ static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, str
                         if (PTR_ERR(inode) == -ESTALE) {
                                 ext2_error(dir->i_sb, __func__,
                                                 "deleted inode referenced: %lu",
-                                                ino);
+                                                (unsigned long) ino);
                                 return ERR_PTR(-EIO);
                         } else {
                                 return ERR_CAST(inode);
diff --git a/fs/ext2/xip.c b/fs/ext2/xip.c
index b72b85884223..c18fbf3e4068 100644
--- a/fs/ext2/xip.c
+++ b/fs/ext2/xip.c
@@ -20,7 +20,7 @@ __inode_direct_access(struct inode *inode, sector_t block,
                       void **kaddr, unsigned long *pfn)
 {
         struct block_device *bdev = inode->i_sb->s_bdev;
-        struct block_device_operations *ops = bdev->bd_disk->fops;
+        const struct block_device_operations *ops = bdev->bd_disk->fops;
         sector_t sector;
 
         sector = block * (PAGE_SIZE / 512); /* ext2 block to bdev sector */
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index cd098a7b77fc..acf1b1423327 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -1830,6 +1830,7 @@ static const struct address_space_operations ext3_ordered_aops = {
         .direct_IO              = ext3_direct_IO,
         .migratepage            = buffer_migrate_page,
         .is_partially_uptodate  = block_is_partially_uptodate,
+        .error_remove_page      = generic_error_remove_page,
 };
 
 static const struct address_space_operations ext3_writeback_aops = {
@@ -1845,6 +1846,7 @@ static const struct address_space_operations ext3_writeback_aops = {
         .direct_IO              = ext3_direct_IO,
         .migratepage            = buffer_migrate_page,
         .is_partially_uptodate  = block_is_partially_uptodate,
+        .error_remove_page      = generic_error_remove_page,
 };
 
 static const struct address_space_operations ext3_journalled_aops = {
@@ -1859,6 +1861,7 @@ static const struct address_space_operations ext3_journalled_aops = {
         .invalidatepage         = ext3_invalidatepage,
         .releasepage            = ext3_releasepage,
         .is_partially_uptodate  = block_is_partially_uptodate,
+        .error_remove_page      = generic_error_remove_page,
 };
 
 void ext3_set_aops(struct inode *inode)
diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index a8d80a7f1105..72743d360509 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -720,7 +720,7 @@ static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
 static ssize_t ext3_quota_write(struct super_block *sb, int type,
                                 const char *data, size_t len, loff_t off);
 
-static struct dquot_operations ext3_quota_operations = {
+static const struct dquot_operations ext3_quota_operations = {
         .initialize     = dquot_initialize,
         .drop           = dquot_drop,
         .alloc_space    = dquot_alloc_space,
@@ -737,7 +737,7 @@ static struct dquot_operations ext3_quota_operations = {
         .destroy_dquot  = dquot_destroy,
 };
 
-static struct quotactl_ops ext3_qctl_operations = {
+static const struct quotactl_ops ext3_qctl_operations = {
         .quota_on       = ext3_quota_on,
         .quota_off      = vfs_quota_off,
         .quota_sync     = vfs_quota_sync,
diff --git a/fs/ext4/Kconfig b/fs/ext4/Kconfig
index d5c0ea2e8f2d..9f2d45d75b1a 100644
--- a/fs/ext4/Kconfig
+++ b/fs/ext4/Kconfig
@@ -26,20 +26,6 @@ config EXT4_FS
 
           If unsure, say N.
 
-config EXT4DEV_COMPAT
-        bool "Enable ext4dev compatibility"
-        depends on EXT4_FS
-        help
-          Starting with 2.6.28, the name of the ext4 filesystem was
-          renamed from ext4dev to ext4.  Unfortunately there are some
-          legacy userspace programs (such as klibc's fstype) have
-          "ext4dev" hardcoded.
-
-          To enable backwards compatibility so that systems that are
-          still expecting to mount ext4 filesystems using ext4dev,
-          choose Y here.   This feature will go away by 2.6.31, so
-          please arrange to get your userspace programs fixed!
-
 config EXT4_FS_XATTR
         bool "Ext4 extended attributes"
         depends on EXT4_FS
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index e227eea23f05..984ca0cb38c3 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -65,6 +65,12 @@ typedef __u32 ext4_lblk_t;
 /* data type for block group number */
 typedef unsigned int ext4_group_t;
 
+/*
+ * Flags used in mballoc's allocation_context flags field.  
+ *
+ * Also used to show what's going on for debugging purposes when the
+ * flag field is exported via the traceport interface
+ */
 
 /* prefer goal again. length */
 #define EXT4_MB_HINT_MERGE              0x0001
@@ -127,6 +133,16 @@ struct mpage_da_data {
         int pages_written;
         int retval;
 };
+#define DIO_AIO_UNWRITTEN       0x1
+typedef struct ext4_io_end {
+        struct list_head        list;           /* per-file finished AIO list */
+        struct inode            *inode;         /* file being written to */
+        unsigned int            flag;           /* unwritten or not */
+        int                     error;          /* I/O error code */
+        ext4_lblk_t             offset;         /* offset in the file */
+        size_t                  size;           /* size of the extent */
+        struct work_struct      work;           /* data work queue */
+} ext4_io_end_t;
 
 /*
  * Special inodes numbers
@@ -347,7 +363,16 @@ struct ext4_new_group_data {
         /* Call ext4_da_update_reserve_space() after successfully 
            allocating the blocks */
 #define EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE    0x0008
-
+        /* caller is from the direct IO path, request to creation of an
+        unitialized extents if not allocated, split the uninitialized
+        extent if blocks has been preallocated already*/
+#define EXT4_GET_BLOCKS_DIO                     0x0010
+#define EXT4_GET_BLOCKS_CONVERT                 0x0020
+#define EXT4_GET_BLOCKS_DIO_CREATE_EXT          (EXT4_GET_BLOCKS_DIO|\
+                                         EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
+        /* Convert extent to initialized after direct IO complete */
+#define EXT4_GET_BLOCKS_DIO_CONVERT_EXT         (EXT4_GET_BLOCKS_CONVERT|\
+                                         EXT4_GET_BLOCKS_DIO_CREATE_EXT)
 
 /*
  * ioctl commands
@@ -500,8 +525,8 @@ struct move_extent {
 static inline __le32 ext4_encode_extra_time(struct timespec *time)
 {
        return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
-                           time->tv_sec >> 32 : 0) |
-                           ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
+                           (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
+                          ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
 }
 
 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
@@ -509,7 +534,7 @@ static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
        if (sizeof(time->tv_sec) > 4)
                time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
                                << 32;
-       time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
+       time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 }
 
 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
@@ -672,6 +697,11 @@ struct ext4_inode_info {
         __u16 i_extra_isize;
 
         spinlock_t i_block_reservation_lock;
+
+        /* completed async DIOs that might need unwritten extents handling */
+        struct list_head i_aio_dio_complete_list;
+        /* current io_end structure for async DIO write*/
+        ext4_io_end_t *cur_aio_dio;
 };
 
 /*
@@ -942,18 +972,11 @@ struct ext4_sb_info {
         unsigned int s_mb_stats;
         unsigned int s_mb_order2_reqs;
         unsigned int s_mb_group_prealloc;
+        unsigned int s_max_writeback_mb_bump;
         /* where last allocation was done - for stream allocation */
         unsigned long s_mb_last_group;
         unsigned long s_mb_last_start;
 
-        /* history to debug policy */
-        struct ext4_mb_history *s_mb_history;
-        int s_mb_history_cur;
-        int s_mb_history_max;
-        int s_mb_history_num;
-        spinlock_t s_mb_history_lock;
-        int s_mb_history_filter;
-
         /* stats for buddy allocator */
         spinlock_t s_mb_pa_lock;
         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
@@ -980,6 +1003,9 @@ struct ext4_sb_info {
 
         unsigned int s_log_groups_per_flex;
         struct flex_groups *s_flex_groups;
+
+        /* workqueue for dio unwritten */
+        struct workqueue_struct *dio_unwritten_wq;
 };
 
 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
@@ -1397,7 +1423,7 @@ extern int ext4_block_truncate_page(handle_t *handle,
                 struct address_space *mapping, loff_t from);
 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
 extern qsize_t ext4_get_reserved_space(struct inode *inode);
-
+extern int flush_aio_dio_completed_IO(struct inode *inode);
 /* ioctl.c */
 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
@@ -1699,6 +1725,8 @@ extern void ext4_ext_init(struct super_block *);
 extern void ext4_ext_release(struct super_block *);
 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
                           loff_t len);
+extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
+                          loff_t len);
 extern int ext4_get_blocks(handle_t *handle, struct inode *inode,
                            sector_t block, unsigned int max_blocks,
                            struct buffer_head *bh, int flags);
diff --git a/fs/ext4/ext4_extents.h b/fs/ext4/ext4_extents.h
index 61652f1d15e6..2ca686454e87 100644
--- a/fs/ext4/ext4_extents.h
+++ b/fs/ext4/ext4_extents.h
@@ -220,6 +220,11 @@ static inline int ext4_ext_get_actual_len(struct ext4_extent *ext)
                 (le16_to_cpu(ext->ee_len) - EXT_INIT_MAX_LEN));
 }
 
+static inline void ext4_ext_mark_initialized(struct ext4_extent *ext)
+{
+        ext->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ext));
+}
+
 extern int ext4_ext_calc_metadata_amount(struct inode *inode, int blocks);
 extern ext4_fsblk_t ext_pblock(struct ext4_extent *ex);
 extern ext4_fsblk_t idx_pblock(struct ext4_extent_idx *);
@@ -235,7 +240,7 @@ extern int ext4_ext_try_to_merge(struct inode *inode,
                                  struct ext4_ext_path *path,
                                  struct ext4_extent *);
 extern unsigned int ext4_ext_check_overlap(struct inode *, struct ext4_extent *, struct ext4_ext_path *);
-extern int ext4_ext_insert_extent(handle_t *, struct inode *, struct ext4_ext_path *, struct ext4_extent *);
+extern int ext4_ext_insert_extent(handle_t *, struct inode *, struct ext4_ext_path *, struct ext4_extent *, int);
 extern int ext4_ext_walk_space(struct inode *, ext4_lblk_t, ext4_lblk_t,
                                                         ext_prepare_callback, void *);
 extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t,
diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h
index 139fb8cb87e4..a2865980342f 100644
--- a/fs/ext4/ext4_jbd2.h
+++ b/fs/ext4/ext4_jbd2.h
@@ -161,11 +161,13 @@ int __ext4_handle_dirty_metadata(const char *where, handle_t *handle,
 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks);
 int __ext4_journal_stop(const char *where, handle_t *handle);
 
-#define EXT4_NOJOURNAL_HANDLE   ((handle_t *) 0x1)
+#define EXT4_NOJOURNAL_MAX_REF_COUNT ((unsigned long) 4096)
 
+/* Note:  Do not use this for NULL handles.  This is only to determine if
+ * a properly allocated handle is using a journal or not. */
 static inline int ext4_handle_valid(handle_t *handle)
 {
-        if (handle == EXT4_NOJOURNAL_HANDLE)
+        if ((unsigned long)handle < EXT4_NOJOURNAL_MAX_REF_COUNT)
                 return 0;
         return 1;
 }
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 7a3832577923..10539e364283 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -723,7 +723,7 @@ err:
  * insert new index [@logical;@ptr] into the block at @curp;
  * check where to insert: before @curp or after @curp
  */
-static int ext4_ext_insert_index(handle_t *handle, struct inode *inode,
+int ext4_ext_insert_index(handle_t *handle, struct inode *inode,
                                 struct ext4_ext_path *curp,
                                 int logical, ext4_fsblk_t ptr)
 {
@@ -1586,7 +1586,7 @@ out:
  */
 int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
                                 struct ext4_ext_path *path,
-                                struct ext4_extent *newext)
+                                struct ext4_extent *newext, int flag)
 {
         struct ext4_extent_header *eh;
         struct ext4_extent *ex, *fex;
@@ -1602,7 +1602,8 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
         BUG_ON(path[depth].p_hdr == NULL);
 
         /* try to insert block into found extent and return */
-        if (ex && ext4_can_extents_be_merged(inode, ex, newext)) {
+        if (ex && (flag != EXT4_GET_BLOCKS_DIO_CREATE_EXT)
+                && ext4_can_extents_be_merged(inode, ex, newext)) {
                 ext_debug("append [%d]%d block to %d:[%d]%d (from %llu)\n",
                                 ext4_ext_is_uninitialized(newext),
                                 ext4_ext_get_actual_len(newext),
@@ -1722,7 +1723,8 @@ has_space:
 
 merge:
         /* try to merge extents to the right */
-        ext4_ext_try_to_merge(inode, path, nearex);
+        if (flag != EXT4_GET_BLOCKS_DIO_CREATE_EXT)
+                ext4_ext_try_to_merge(inode, path, nearex);
 
         /* try to merge extents to the left */
 
@@ -2378,6 +2380,7 @@ void ext4_ext_init(struct super_block *sb)
          */
 
         if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
+#if defined(AGGRESSIVE_TEST) || defined(CHECK_BINSEARCH) || defined(EXTENTS_STATS)
                 printk(KERN_INFO "EXT4-fs: file extents enabled");
 #ifdef AGGRESSIVE_TEST
                 printk(", aggressive tests");
@@ -2389,6 +2392,7 @@ void ext4_ext_init(struct super_block *sb)
                 printk(", stats");
 #endif
                 printk("\n");
+#endif
 #ifdef EXTENTS_STATS
                 spin_lock_init(&EXT4_SB(sb)->s_ext_stats_lock);
                 EXT4_SB(sb)->s_ext_min = 1 << 30;
@@ -2490,7 +2494,6 @@ static int ext4_ext_zeroout(struct inode *inode, struct ext4_extent *ex)
 }
 
 #define EXT4_EXT_ZERO_LEN 7
-
 /*
  * This function is called by ext4_ext_get_blocks() if someone tries to write
  * to an uninitialized extent. It may result in splitting the uninitialized
@@ -2583,7 +2586,8 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
                         ex3->ee_block = cpu_to_le32(iblock);
                         ext4_ext_store_pblock(ex3, newblock);
                         ex3->ee_len = cpu_to_le16(allocated);
-                        err = ext4_ext_insert_extent(handle, inode, path, ex3);
+                        err = ext4_ext_insert_extent(handle, inode, path,
+                                                        ex3, 0);
                         if (err == -ENOSPC) {
                                 err =  ext4_ext_zeroout(inode, &orig_ex);
                                 if (err)
@@ -2639,7 +2643,7 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
                 ext4_ext_store_pblock(ex3, newblock + max_blocks);
                 ex3->ee_len = cpu_to_le16(allocated - max_blocks);
                 ext4_ext_mark_uninitialized(ex3);
-                err = ext4_ext_insert_extent(handle, inode, path, ex3);
+                err = ext4_ext_insert_extent(handle, inode, path, ex3, 0);
                 if (err == -ENOSPC) {
                         err =  ext4_ext_zeroout(inode, &orig_ex);
                         if (err)
@@ -2757,7 +2761,7 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
         err = ext4_ext_dirty(handle, inode, path + depth);
         goto out;
 insert:
-        err = ext4_ext_insert_extent(handle, inode, path, &newex);
+        err = ext4_ext_insert_extent(handle, inode, path, &newex, 0);
         if (err == -ENOSPC) {
                 err =  ext4_ext_zeroout(inode, &orig_ex);
                 if (err)
@@ -2785,6 +2789,324 @@ fix_extent_len:
 }
 
 /*
+ * This function is called by ext4_ext_get_blocks() from
+ * ext4_get_blocks_dio_write() when DIO to write
+ * to an uninitialized extent.
+ *
+ * Writing to an uninitized extent may result in splitting the uninitialized
+ * extent into multiple /intialized unintialized extents (up to three)
+ * There are three possibilities:
+ *   a> There is no split required: Entire extent should be uninitialized
+ *   b> Splits in two extents: Write is happening at either end of the extent
+ *   c> Splits in three extents: Somone is writing in middle of the extent
+ *
+ * One of more index blocks maybe needed if the extent tree grow after
+ * the unintialized extent split. To prevent ENOSPC occur at the IO
+ * complete, we need to split the uninitialized extent before DIO submit
+ * the IO. The uninitilized extent called at this time will be split
+ * into three uninitialized extent(at most). After IO complete, the part
+ * being filled will be convert to initialized by the end_io callback function
+ * via ext4_convert_unwritten_extents().
+ */
+static int ext4_split_unwritten_extents(handle_t *handle,
+                                        struct inode *inode,
+                                        struct ext4_ext_path *path,
+                                        ext4_lblk_t iblock,
+                                        unsigned int max_blocks,
+                                        int flags)
+{
+        struct ext4_extent *ex, newex, orig_ex;
+        struct ext4_extent *ex1 = NULL;
+        struct ext4_extent *ex2 = NULL;
+        struct ext4_extent *ex3 = NULL;
+        struct ext4_extent_header *eh;
+        ext4_lblk_t ee_block;
+        unsigned int allocated, ee_len, depth;
+        ext4_fsblk_t newblock;
+        int err = 0;
+        int ret = 0;
+
+        ext_debug("ext4_split_unwritten_extents: inode %lu,"
+                  "iblock %llu, max_blocks %u\n", inode->i_ino,
+                  (unsigned long long)iblock, max_blocks);
+        depth = ext_depth(inode);
+        eh = path[depth].p_hdr;
+        ex = path[depth].p_ext;
+        ee_block = le32_to_cpu(ex->ee_block);
+        ee_len = ext4_ext_get_actual_len(ex);
+        allocated = ee_len - (iblock - ee_block);
+        newblock = iblock - ee_block + ext_pblock(ex);
+        ex2 = ex;
+        orig_ex.ee_block = ex->ee_block;
+        orig_ex.ee_len   = cpu_to_le16(ee_len);
+        ext4_ext_store_pblock(&orig_ex, ext_pblock(ex));
+
+        /*
+         * if the entire unintialized extent length less than
+         * the size of extent to write, there is no need to split
+         * uninitialized extent
+         */
+        if (allocated <= max_blocks)
+                return ret;
+
+        err = ext4_ext_get_access(handle, inode, path + depth);
+        if (err)
+                goto out;
+        /* ex1: ee_block to iblock - 1 : uninitialized */
+        if (iblock > ee_block) {
+                ex1 = ex;
+                ex1->ee_len = cpu_to_le16(iblock - ee_block);
+                ext4_ext_mark_uninitialized(ex1);
+                ex2 = &newex;
+        }
+        /*
+         * for sanity, update the length of the ex2 extent before
+         * we insert ex3, if ex1 is NULL. This is to avoid temporary
+         * overlap of blocks.
+         */
+        if (!ex1 && allocated > max_blocks)
+                ex2->ee_len = cpu_to_le16(max_blocks);
+        /* ex3: to ee_block + ee_len : uninitialised */
+        if (allocated > max_blocks) {
+                unsigned int newdepth;
+                ex3 = &newex;
+                ex3->ee_block = cpu_to_le32(iblock + max_blocks);
+                ext4_ext_store_pblock(ex3, newblock + max_blocks);
+                ex3->ee_len = cpu_to_le16(allocated - max_blocks);
+                ext4_ext_mark_uninitialized(ex3);
+                err = ext4_ext_insert_extent(handle, inode, path, ex3, flags);
+                if (err == -ENOSPC) {
+                        err =  ext4_ext_zeroout(inode, &orig_ex);
+                        if (err)
+                                goto fix_extent_len;
+                        /* update the extent length and mark as initialized */
+                        ex->ee_block = orig_ex.ee_block;
+                        ex->ee_len   = orig_ex.ee_len;
+                        ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
+                        ext4_ext_dirty(handle, inode, path + depth);
+                        /* zeroed the full extent */
+                        /* blocks available from iblock */
+                        return allocated;
+
+                } else if (err)
+                        goto fix_extent_len;
+                /*
+                 * The depth, and hence eh & ex might change
+                 * as part of the insert above.
+                 */
+                newdepth = ext_depth(inode);
+                /*
+                 * update the extent length after successful insert of the
+                 * split extent
+                 */
+                orig_ex.ee_len = cpu_to_le16(ee_len -
+                                                ext4_ext_get_actual_len(ex3));
+                depth = newdepth;
+                ext4_ext_drop_refs(path);
+                path = ext4_ext_find_extent(inode, iblock, path);
+                if (IS_ERR(path)) {
+                        err = PTR_ERR(path);
+                        goto out;
+                }
+                eh = path[depth].p_hdr;
+                ex = path[depth].p_ext;
+                if (ex2 != &newex)
+                        ex2 = ex;
+
+                err = ext4_ext_get_access(handle, inode, path + depth);
+                if (err)
+                        goto out;
+
+                allocated = max_blocks;
+        }
+        /*
+         * If there was a change of depth as part of the
+         * insertion of ex3 above, we need to update the length
+         * of the ex1 extent again here
+         */
+        if (ex1 && ex1 != ex) {
+                ex1 = ex;
+                ex1->ee_len = cpu_to_le16(iblock - ee_block);
+                ext4_ext_mark_uninitialized(ex1);
+                ex2 = &newex;
+        }
+        /*
+         * ex2: iblock to iblock + maxblocks-1 : to be direct IO written,
+         * uninitialised still.
+         */
+        ex2->ee_block = cpu_to_le32(iblock);
+        ext4_ext_store_pblock(ex2, newblock);
+        ex2->ee_len = cpu_to_le16(allocated);
+        ext4_ext_mark_uninitialized(ex2);
+        if (ex2 != ex)
+                goto insert;
+        /* Mark modified extent as dirty */
+        err = ext4_ext_dirty(handle, inode, path + depth);
+        ext_debug("out here\n");
+        goto out;
+insert:
+        err = ext4_ext_insert_extent(handle, inode, path, &newex, flags);
+        if (err == -ENOSPC) {
+                err =  ext4_ext_zeroout(inode, &orig_ex);
+                if (err)
+                        goto fix_extent_len;
+                /* update the extent length and mark as initialized */
+                ex->ee_block = orig_ex.ee_block;
+                ex->ee_len   = orig_ex.ee_len;
+                ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
+                ext4_ext_dirty(handle, inode, path + depth);
+                /* zero out the first half */
+                return allocated;
+        } else if (err)
+                goto fix_extent_len;
+out:
+        ext4_ext_show_leaf(inode, path);
+        return err ? err : allocated;
+
+fix_extent_len:
+        ex->ee_block = orig_ex.ee_block;
+        ex->ee_len   = orig_ex.ee_len;
+        ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
+        ext4_ext_mark_uninitialized(ex);
+        ext4_ext_dirty(handle, inode, path + depth);
+        return err;
+}
+static int ext4_convert_unwritten_extents_dio(handle_t *handle,
+                                              struct inode *inode,
+                                              struct ext4_ext_path *path)
+{
+        struct ext4_extent *ex;
+        struct ext4_extent_header *eh;
+        int depth;
+        int err = 0;
+        int ret = 0;
+
+        depth = ext_depth(inode);
+        eh = path[depth].p_hdr;
+        ex = path[depth].p_ext;
+
+        err = ext4_ext_get_access(handle, inode, path + depth);
+        if (err)
+                goto out;
+        /* first mark the extent as initialized */
+        ext4_ext_mark_initialized(ex);
+
+        /*
+         * We have to see if it can be merged with the extent
+         * on the left.
+         */
+        if (ex > EXT_FIRST_EXTENT(eh)) {
+                /*
+                 * To merge left, pass "ex - 1" to try_to_merge(),
+                 * since it merges towards right _only_.
+                 */
+                ret = ext4_ext_try_to_merge(inode, path, ex - 1);
+                if (ret) {
+                        err = ext4_ext_correct_indexes(handle, inode, path);
+                        if (err)
+                                goto out;
+                        depth = ext_depth(inode);
+                        ex--;
+                }
+        }
+        /*
+         * Try to Merge towards right.
+         */
+        ret = ext4_ext_try_to_merge(inode, path, ex);
+        if (ret) {
+                err = ext4_ext_correct_indexes(handle, inode, path);
+                if (err)
+                        goto out;
+                depth = ext_depth(inode);
+        }
+        /* Mark modified extent as dirty */
+        err = ext4_ext_dirty(handle, inode, path + depth);
+out:
+        ext4_ext_show_leaf(inode, path);
+        return err;
+}
+
+static int
+ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode,
+                        ext4_lblk_t iblock, unsigned int max_blocks,
+                        struct ext4_ext_path *path, int flags,
+                        unsigned int allocated, struct buffer_head *bh_result,
+                        ext4_fsblk_t newblock)
+{
+        int ret = 0;
+        int err = 0;
+        ext4_io_end_t *io = EXT4_I(inode)->cur_aio_dio;
+
+        ext_debug("ext4_ext_handle_uninitialized_extents: inode %lu, logical"
+                  "block %llu, max_blocks %u, flags %d, allocated %u",
+                  inode->i_ino, (unsigned long long)iblock, max_blocks,
+                  flags, allocated);
+        ext4_ext_show_leaf(inode, path);
+
+        /* DIO get_block() before submit the IO, split the extent */
+        if (flags == EXT4_GET_BLOCKS_DIO_CREATE_EXT) {
+                ret = ext4_split_unwritten_extents(handle,
+                                                inode, path, iblock,
+                                                max_blocks, flags);
+                /* flag the io_end struct that we need convert when IO done */
+                if (io)
+                        io->flag = DIO_AIO_UNWRITTEN;
+                goto out;
+        }
+        /* DIO end_io complete, convert the filled extent to written */
+        if (flags == EXT4_GET_BLOCKS_DIO_CONVERT_EXT) {
+                ret = ext4_convert_unwritten_extents_dio(handle, inode,
+                                                        path);
+                goto out2;
+        }
+        /* buffered IO case */
+        /*
+         * repeat fallocate creation request
+         * we already have an unwritten extent
+         */
+        if (flags & EXT4_GET_BLOCKS_UNINIT_EXT)
+                goto map_out;
+
+        /* buffered READ or buffered write_begin() lookup */
+        if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
+                /*
+                 * We have blocks reserved already.  We
+                 * return allocated blocks so that delalloc
+                 * won't do block reservation for us.  But
+                 * the buffer head will be unmapped so that
+                 * a read from the block returns 0s.
+                 */
+                set_buffer_unwritten(bh_result);
+                goto out1;
+        }
+
+        /* buffered write, writepage time, convert*/
+        ret = ext4_ext_convert_to_initialized(handle, inode,
+                                                path, iblock,
+                                                max_blocks);
+out:
+        if (ret <= 0) {
+                err = ret;
+                goto out2;
+        } else
+                allocated = ret;
+        set_buffer_new(bh_result);
+map_out:
+        set_buffer_mapped(bh_result);
+out1:
+        if (allocated > max_blocks)
+                allocated = max_blocks;
+        ext4_ext_show_leaf(inode, path);
+        bh_result->b_bdev = inode->i_sb->s_bdev;
+        bh_result->b_blocknr = newblock;
+out2:
+        if (path) {
+                ext4_ext_drop_refs(path);
+                kfree(path);
+        }
+        return err ? err : allocated;
+}
+/*
  * Block allocation/map/preallocation routine for extents based files
  *
  *
@@ -2814,6 +3136,7 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
         int err = 0, depth, ret, cache_type;
         unsigned int allocated = 0;
         struct ext4_allocation_request ar;
+        ext4_io_end_t *io = EXT4_I(inode)->cur_aio_dio;
 
         __clear_bit(BH_New, &bh_result->b_state);
         ext_debug("blocks %u/%u requested for inode %lu\n",
@@ -2889,33 +3212,10 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
                                                         EXT4_EXT_CACHE_EXTENT);
                                 goto out;
                         }
-                        if (flags & EXT4_GET_BLOCKS_UNINIT_EXT)
-                                goto out;
-                        if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
-                                if (allocated > max_blocks)
-                                        allocated = max_blocks;
-                                /*
-                                 * We have blocks reserved already.  We
-                                 * return allocated blocks so that delalloc
-                                 * won't do block reservation for us.  But
-                                 * the buffer head will be unmapped so that
-                                 * a read from the block returns 0s.
-                                 */
-                                set_buffer_unwritten(bh_result);
-                                bh_result->b_bdev = inode->i_sb->s_bdev;
-                                bh_result->b_blocknr = newblock;
-                                goto out2;
-                        }
-
-                        ret = ext4_ext_convert_to_initialized(handle, inode,
-                                                                path, iblock,
-                                                                max_blocks);
-                        if (ret <= 0) {
-                                err = ret;
-                                goto out2;
-                        } else
-                                allocated = ret;
-                        goto outnew;
+                        ret = ext4_ext_handle_uninitialized_extents(handle,
+                                        inode, iblock, max_blocks, path,
+                                        flags, allocated, bh_result, newblock);
+                        return ret;
                 }
         }
 
@@ -2986,9 +3286,21 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
         /* try to insert new extent into found leaf and return */
         ext4_ext_store_pblock(&newex, newblock);
         newex.ee_len = cpu_to_le16(ar.len);
-        if (flags & EXT4_GET_BLOCKS_UNINIT_EXT)  /* Mark uninitialized */
+        /* Mark uninitialized */
+        if (flags & EXT4_GET_BLOCKS_UNINIT_EXT){
                 ext4_ext_mark_uninitialized(&newex);
-        err = ext4_ext_insert_extent(handle, inode, path, &newex);
+                /*
+                 * io_end structure was created for every async
+                 * direct IO write to the middle of the file.
+                 * To avoid unecessary convertion for every aio dio rewrite
+                 * to the mid of file, here we flag the IO that is really
+                 * need the convertion.
+                 *
+                 */
+                if (io && flags == EXT4_GET_BLOCKS_DIO_CREATE_EXT)
+                        io->flag = DIO_AIO_UNWRITTEN;
+        }
+        err = ext4_ext_insert_extent(handle, inode, path, &newex, flags);
         if (err) {
                 /* free data blocks we just allocated */
                 /* not a good idea to call discard here directly,
@@ -3002,7 +3314,6 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
         /* previous routine could use block we allocated */
         newblock = ext_pblock(&newex);
         allocated = ext4_ext_get_actual_len(&newex);
-outnew:
         set_buffer_new(bh_result);
 
         /* Cache only when it is _not_ an uninitialized extent */
@@ -3201,6 +3512,63 @@ retry:
 }
 
 /*
+ * This function convert a range of blocks to written extents
+ * The caller of this function will pass the start offset and the size.
+ * all unwritten extents within this range will be converted to
+ * written extents.
+ *
+ * This function is called from the direct IO end io call back
+ * function, to convert the fallocated extents after IO is completed.
+ */
+int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
+                                    loff_t len)
+{
+        handle_t *handle;
+        ext4_lblk_t block;
+        unsigned int max_blocks;
+        int ret = 0;
+        int ret2 = 0;
+        struct buffer_head map_bh;
+        unsigned int credits, blkbits = inode->i_blkbits;
+
+        block = offset >> blkbits;
+        /*
+         * We can't just convert len to max_blocks because
+         * If blocksize = 4096 offset = 3072 and len = 2048
+         */
+        max_blocks = (EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits)
+                                                        - block;
+        /*
+         * credits to insert 1 extent into extent tree
+         */
+        credits = ext4_chunk_trans_blocks(inode, max_blocks);
+        while (ret >= 0 && ret < max_blocks) {
+                block = block + ret;
+                max_blocks = max_blocks - ret;
+                handle = ext4_journal_start(inode, credits);
+                if (IS_ERR(handle)) {
+                        ret = PTR_ERR(handle);
+                        break;
+                }
+                map_bh.b_state = 0;
+                ret = ext4_get_blocks(handle, inode, block,
+                                      max_blocks, &map_bh,
+                                      EXT4_GET_BLOCKS_DIO_CONVERT_EXT);
+                if (ret <= 0) {
+                        WARN_ON(ret <= 0);
+                        printk(KERN_ERR "%s: ext4_ext_get_blocks "
+                                    "returned error inode#%lu, block=%u, "
+                                    "max_blocks=%u", __func__,
+                                    inode->i_ino, block, max_blocks);
+                }
+                ext4_mark_inode_dirty(handle, inode);
+                ret2 = ext4_journal_stop(handle);
+                if (ret <= 0 || ret2 )
+                        break;
+        }
+        return ret > 0 ? ret2 : ret;
+}
+/*
  * Callback function called for each extent to gather FIEMAP information.
  */
 static int ext4_ext_fiemap_cb(struct inode *inode, struct ext4_ext_path *path,
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 5ca3eca70a1e..9630583cef28 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -81,7 +81,7 @@ ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
         return generic_file_aio_write(iocb, iov, nr_segs, pos);
 }
 
-static struct vm_operations_struct ext4_file_vm_ops = {
+static const struct vm_operations_struct ext4_file_vm_ops = {
         .fault          = filemap_fault,
         .page_mkwrite   = ext4_page_mkwrite,
 };
diff --git a/fs/ext4/fsync.c b/fs/ext4/fsync.c
index 07475740b512..2b1531266ee2 100644
--- a/fs/ext4/fsync.c
+++ b/fs/ext4/fsync.c
@@ -44,6 +44,8 @@
  *
  * What we do is just kick off a commit and wait on it.  This will snapshot the
  * inode to disk.
+ *
+ * i_mutex lock is held when entering and exiting this function
  */
 
 int ext4_sync_file(struct file *file, struct dentry *dentry, int datasync)
@@ -56,6 +58,9 @@ int ext4_sync_file(struct file *file, struct dentry *dentry, int datasync)
 
         trace_ext4_sync_file(file, dentry, datasync);
 
+        ret = flush_aio_dio_completed_IO(inode);
+        if (ret < 0)
+                goto out;
         /*
          * data=writeback:
          *  The caller's filemap_fdatawrite()/wait will sync the data.
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 4abd683b963d..5c5bc5dafff8 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -37,6 +37,7 @@
 #include <linux/namei.h>
 #include <linux/uio.h>
 #include <linux/bio.h>
+#include <linux/workqueue.h>
 
 #include "ext4_jbd2.h"
 #include "xattr.h"
@@ -1145,6 +1146,64 @@ static int check_block_validity(struct inode *inode, const char *msg,
 }
 
 /*
+ * Return the number of contiguous dirty pages in a given inode
+ * starting at page frame idx.
+ */
+static pgoff_t ext4_num_dirty_pages(struct inode *inode, pgoff_t idx,
+                                    unsigned int max_pages)
+{
+        struct address_space *mapping = inode->i_mapping;
+        pgoff_t index;
+        struct pagevec pvec;
+        pgoff_t num = 0;
+        int i, nr_pages, done = 0;
+
+        if (max_pages == 0)
+                return 0;
+        pagevec_init(&pvec, 0);
+        while (!done) {
+                index = idx;
+                nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
+                                              PAGECACHE_TAG_DIRTY,
+                                              (pgoff_t)PAGEVEC_SIZE);
+                if (nr_pages == 0)
+                        break;
+                for (i = 0; i < nr_pages; i++) {
+                        struct page *page = pvec.pages[i];
+                        struct buffer_head *bh, *head;
+
+                        lock_page(page);
+                        if (unlikely(page->mapping != mapping) ||
+                            !PageDirty(page) ||
+                            PageWriteback(page) ||
+                            page->index != idx) {
+                                done = 1;
+                                unlock_page(page);
+                                break;
+                        }
+                        if (page_has_buffers(page)) {
+                                bh = head = page_buffers(page);
+                                do {
+                                        if (!buffer_delay(bh) &&
+                                            !buffer_unwritten(bh))
+                                                done = 1;
+                                        bh = bh->b_this_page;
+                                } while (!done && (bh != head));
+                        }
+                        unlock_page(page);
+                        if (done)
+                                break;
+                        idx++;
+                        num++;
+                        if (num >= max_pages)
+                                break;
+                }
+                pagevec_release(&pvec);
+        }
+        return num;
+}
+
+/*
  * The ext4_get_blocks() function tries to look up the requested blocks,
  * and returns if the blocks are already mapped.
  *
@@ -1175,6 +1234,9 @@ int ext4_get_blocks(handle_t *handle, struct inode *inode, sector_t block,
         clear_buffer_mapped(bh);
         clear_buffer_unwritten(bh);
 
+        ext_debug("ext4_get_blocks(): inode %lu, flag %d, max_blocks %u,"
+                  "logical block %lu\n", inode->i_ino, flags, max_blocks,
+                  (unsigned long)block);
         /*
          * Try to see if we can get the block without requesting a new
          * file system block.
@@ -1796,11 +1858,11 @@ repeat:
 
         if (ext4_claim_free_blocks(sbi, total)) {
                 spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
+                vfs_dq_release_reservation_block(inode, total);
                 if (ext4_should_retry_alloc(inode->i_sb, &retries)) {
                         yield();
                         goto repeat;
                 }
-                vfs_dq_release_reservation_block(inode, total);
                 return -ENOSPC;
         }
         EXT4_I(inode)->i_reserved_data_blocks += nrblocks;
@@ -2092,18 +2154,18 @@ static void ext4_da_block_invalidatepages(struct mpage_da_data *mpd,
 static void ext4_print_free_blocks(struct inode *inode)
 {
         struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
-        printk(KERN_EMERG "Total free blocks count %lld\n",
-                        ext4_count_free_blocks(inode->i_sb));
-        printk(KERN_EMERG "Free/Dirty block details\n");
-        printk(KERN_EMERG "free_blocks=%lld\n",
-                        (long long)percpu_counter_sum(&sbi->s_freeblocks_counter));
-        printk(KERN_EMERG "dirty_blocks=%lld\n",
-                        (long long)percpu_counter_sum(&sbi->s_dirtyblocks_counter));
-        printk(KERN_EMERG "Block reservation details\n");
-        printk(KERN_EMERG "i_reserved_data_blocks=%u\n",
-                        EXT4_I(inode)->i_reserved_data_blocks);
-        printk(KERN_EMERG "i_reserved_meta_blocks=%u\n",
-                        EXT4_I(inode)->i_reserved_meta_blocks);
+        printk(KERN_CRIT "Total free blocks count %lld\n",
+               ext4_count_free_blocks(inode->i_sb));
+        printk(KERN_CRIT "Free/Dirty block details\n");
+        printk(KERN_CRIT "free_blocks=%lld\n",
+               (long long) percpu_counter_sum(&sbi->s_freeblocks_counter));
+        printk(KERN_CRIT "dirty_blocks=%lld\n",
+               (long long) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
+        printk(KERN_CRIT "Block reservation details\n");
+        printk(KERN_CRIT "i_reserved_data_blocks=%u\n",
+               EXT4_I(inode)->i_reserved_data_blocks);
+        printk(KERN_CRIT "i_reserved_meta_blocks=%u\n",
+               EXT4_I(inode)->i_reserved_meta_blocks);
         return;
 }
 
@@ -2189,14 +2251,14 @@ static int mpage_da_map_blocks(struct mpage_da_data *mpd)
                  * writepage and writepages will again try to write
                  * the same.
                  */
-                printk(KERN_EMERG "%s block allocation failed for inode %lu "
-                                  "at logical offset %llu with max blocks "
-                                  "%zd with error %d\n",
-                                  __func__, mpd->inode->i_ino,
-                                  (unsigned long long)next,
-                                  mpd->b_size >> mpd->inode->i_blkbits, err);
-                printk(KERN_EMERG "This should not happen.!! "
-                                        "Data will be lost\n");
+                ext4_msg(mpd->inode->i_sb, KERN_CRIT,
+                         "delayed block allocation failed for inode %lu at "
+                         "logical offset %llu with max blocks %zd with "
+                         "error %d\n", mpd->inode->i_ino,
+                         (unsigned long long) next,
+                         mpd->b_size >> mpd->inode->i_blkbits, err);
+                printk(KERN_CRIT "This should not happen!!  "
+                       "Data will be lost\n");
                 if (err == -ENOSPC) {
                         ext4_print_free_blocks(mpd->inode);
                 }
@@ -2337,7 +2399,7 @@ static int __mpage_da_writepage(struct page *page,
                 /*
                  * Rest of the page in the page_vec
                  * redirty then and skip then. We will
-                 * try to to write them again after
+                 * try to write them again after
                  * starting a new transaction
                  */
                 redirty_page_for_writepage(wbc, page);
@@ -2743,8 +2805,10 @@ static int ext4_da_writepages(struct address_space *mapping,
         int no_nrwrite_index_update;
         int pages_written = 0;
         long pages_skipped;
+        unsigned int max_pages;
         int range_cyclic, cycled = 1, io_done = 0;
-        int needed_blocks, ret = 0, nr_to_writebump = 0;
+        int needed_blocks, ret = 0;
+        long desired_nr_to_write, nr_to_writebump = 0;
         loff_t range_start = wbc->range_start;
         struct ext4_sb_info *sbi = EXT4_SB(mapping->host->i_sb);
 
@@ -2771,16 +2835,6 @@ static int ext4_da_writepages(struct address_space *mapping,
         if (unlikely(sbi->s_mount_flags & EXT4_MF_FS_ABORTED))
                 return -EROFS;
 
-        /*
-         * Make sure nr_to_write is >= sbi->s_mb_stream_request
-         * This make sure small files blocks are allocated in
-         * single attempt. This ensure that small files
-         * get less fragmented.
-         */
-        if (wbc->nr_to_write < sbi->s_mb_stream_request) {
-                nr_to_writebump = sbi->s_mb_stream_request - wbc->nr_to_write;
-                wbc->nr_to_write = sbi->s_mb_stream_request;
-        }
         if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
                 range_whole = 1;
 
@@ -2795,6 +2849,36 @@ static int ext4_da_writepages(struct address_space *mapping,
         } else
                 index = wbc->range_start >> PAGE_CACHE_SHIFT;
 
+        /*
+         * This works around two forms of stupidity.  The first is in
+         * the writeback code, which caps the maximum number of pages
+         * written to be 1024 pages.  This is wrong on multiple
+         * levels; different architectues have a different page size,
+         * which changes the maximum amount of data which gets
+         * written.  Secondly, 4 megabytes is way too small.  XFS
+         * forces this value to be 16 megabytes by multiplying
+         * nr_to_write parameter by four, and then relies on its
+         * allocator to allocate larger extents to make them
+         * contiguous.  Unfortunately this brings us to the second
+         * stupidity, which is that ext4's mballoc code only allocates
+         * at most 2048 blocks.  So we force contiguous writes up to
+         * the number of dirty blocks in the inode, or
+         * sbi->max_writeback_mb_bump whichever is smaller.
+         */
+        max_pages = sbi->s_max_writeback_mb_bump << (20 - PAGE_CACHE_SHIFT);
+        if (!range_cyclic && range_whole)
+                desired_nr_to_write = wbc->nr_to_write * 8;
+        else
+                desired_nr_to_write = ext4_num_dirty_pages(inode, index,
+                                                           max_pages);
+        if (desired_nr_to_write > max_pages)
+                desired_nr_to_write = max_pages;
+
+        if (wbc->nr_to_write < desired_nr_to_write) {
+                nr_to_writebump = desired_nr_to_write - wbc->nr_to_write;
+                wbc->nr_to_write = desired_nr_to_write;
+        }
+
         mpd.wbc = wbc;
         mpd.inode = mapping->host;
 
@@ -2822,10 +2906,9 @@ retry:
                 handle = ext4_journal_start(inode, needed_blocks);
                 if (IS_ERR(handle)) {
                         ret = PTR_ERR(handle);
-                        printk(KERN_CRIT "%s: jbd2_start: "
+                        ext4_msg(inode->i_sb, KERN_CRIT, "%s: jbd2_start: "
                                "%ld pages, ino %lu; err %d\n", __func__,
                                 wbc->nr_to_write, inode->i_ino, ret);
-                        dump_stack();
                         goto out_writepages;
                 }
 
@@ -2897,9 +2980,10 @@ retry:
                 goto retry;
         }
         if (pages_skipped != wbc->pages_skipped)
-                printk(KERN_EMERG "This should not happen leaving %s "
-                                "with nr_to_write = %ld ret = %d\n",
-                                __func__, wbc->nr_to_write, ret);
+                ext4_msg(inode->i_sb, KERN_CRIT,
+                         "This should not happen leaving %s "
+                         "with nr_to_write = %ld ret = %d\n",
+                         __func__, wbc->nr_to_write, ret);
 
         /* Update index */
         index += pages_written;
@@ -2914,7 +2998,8 @@ retry:
 out_writepages:
         if (!no_nrwrite_index_update)
                 wbc->no_nrwrite_index_update = 0;
-        wbc->nr_to_write -= nr_to_writebump;
+        if (wbc->nr_to_write > nr_to_writebump)
+                wbc->nr_to_write -= nr_to_writebump;
         wbc->range_start = range_start;
         trace_ext4_da_writepages_result(inode, wbc, ret, pages_written);
         return ret;
@@ -3272,6 +3357,8 @@ static int ext4_releasepage(struct page *page, gfp_t wait)
 }
 
 /*
+ * O_DIRECT for ext3 (or indirect map) based files
+ *
  * If the O_DIRECT write will extend the file then add this inode to the
  * orphan list.  So recovery will truncate it back to the original size
  * if the machine crashes during the write.
@@ -3280,7 +3367,7 @@ static int ext4_releasepage(struct page *page, gfp_t wait)
  * crashes then stale disk data _may_ be exposed inside the file. But current
  * VFS code falls back into buffered path in that case so we are safe.
  */
-static ssize_t ext4_direct_IO(int rw, struct kiocb *iocb,
+static ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
                               const struct iovec *iov, loff_t offset,
                               unsigned long nr_segs)
 {
@@ -3291,6 +3378,7 @@ static ssize_t ext4_direct_IO(int rw, struct kiocb *iocb,
         ssize_t ret;
         int orphan = 0;
         size_t count = iov_length(iov, nr_segs);
+        int retries = 0;
 
         if (rw == WRITE) {
                 loff_t final_size = offset + count;
@@ -3313,9 +3401,12 @@ static ssize_t ext4_direct_IO(int rw, struct kiocb *iocb,
                 }
         }
 
+retry:
         ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
                                  offset, nr_segs,
                                  ext4_get_block, NULL);
+        if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
+                goto retry;
 
         if (orphan) {
                 int err;
@@ -3354,6 +3445,359 @@ out:
         return ret;
 }
 
+/* Maximum number of blocks we map for direct IO at once. */
+
+static int ext4_get_block_dio_write(struct inode *inode, sector_t iblock,
+                   struct buffer_head *bh_result, int create)
+{
+        handle_t *handle = NULL;
+        int ret = 0;
+        unsigned max_blocks = bh_result->b_size >> inode->i_blkbits;
+        int dio_credits;
+
+        ext4_debug("ext4_get_block_dio_write: inode %lu, create flag %d\n",
+                   inode->i_ino, create);
+        /*
+         * DIO VFS code passes create = 0 flag for write to
+         * the middle of file. It does this to avoid block
+         * allocation for holes, to prevent expose stale data
+         * out when there is parallel buffered read (which does
+         * not hold the i_mutex lock) while direct IO write has
+         * not completed. DIO request on holes finally falls back
+         * to buffered IO for this reason.
+         *
+         * For ext4 extent based file, since we support fallocate,
+         * new allocated extent as uninitialized, for holes, we
+         * could fallocate blocks for holes, thus parallel
+         * buffered IO read will zero out the page when read on
+         * a hole while parallel DIO write to the hole has not completed.
+         *
+         * when we come here, we know it's a direct IO write to
+         * to the middle of file (<i_size)
+         * so it's safe to override the create flag from VFS.
+         */
+        create = EXT4_GET_BLOCKS_DIO_CREATE_EXT;
+
+        if (max_blocks > DIO_MAX_BLOCKS)
+                max_blocks = DIO_MAX_BLOCKS;
+        dio_credits = ext4_chunk_trans_blocks(inode, max_blocks);
+        handle = ext4_journal_start(inode, dio_credits);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                goto out;
+        }
+        ret = ext4_get_blocks(handle, inode, iblock, max_blocks, bh_result,
+                              create);
+        if (ret > 0) {
+                bh_result->b_size = (ret << inode->i_blkbits);
+                ret = 0;
+        }
+        ext4_journal_stop(handle);
+out:
+        return ret;
+}
+
+static void ext4_free_io_end(ext4_io_end_t *io)
+{
+        BUG_ON(!io);
+        iput(io->inode);
+        kfree(io);
+}
+static void dump_aio_dio_list(struct inode * inode)
+{
+#ifdef  EXT4_DEBUG
+        struct list_head *cur, *before, *after;
+        ext4_io_end_t *io, *io0, *io1;
+
+        if (list_empty(&EXT4_I(inode)->i_aio_dio_complete_list)){
+                ext4_debug("inode %lu aio dio list is empty\n", inode->i_ino);
+                return;
+        }
+
+        ext4_debug("Dump inode %lu aio_dio_completed_IO list \n", inode->i_ino);
+        list_for_each_entry(io, &EXT4_I(inode)->i_aio_dio_complete_list, list){
+                cur = &io->list;
+                before = cur->prev;
+                io0 = container_of(before, ext4_io_end_t, list);
+                after = cur->next;
+                io1 = container_of(after, ext4_io_end_t, list);
+
+                ext4_debug("io 0x%p from inode %lu,prev 0x%p,next 0x%p\n",
+                            io, inode->i_ino, io0, io1);
+        }
+#endif
+}
+
+/*
+ * check a range of space and convert unwritten extents to written.
+ */
+static int ext4_end_aio_dio_nolock(ext4_io_end_t *io)
+{
+        struct inode *inode = io->inode;
+        loff_t offset = io->offset;
+        size_t size = io->size;
+        int ret = 0;
+
+        ext4_debug("end_aio_dio_onlock: io 0x%p from inode %lu,list->next 0x%p,"
+                   "list->prev 0x%p\n",
+                   io, inode->i_ino, io->list.next, io->list.prev);
+
+        if (list_empty(&io->list))
+                return ret;
+
+        if (io->flag != DIO_AIO_UNWRITTEN)
+                return ret;
+
+        if (offset + size <= i_size_read(inode))
+                ret = ext4_convert_unwritten_extents(inode, offset, size);
+
+        if (ret < 0) {
+                printk(KERN_EMERG "%s: failed to convert unwritten"
+                        "extents to written extents, error is %d"
+                        " io is still on inode %lu aio dio list\n",
+                       __func__, ret, inode->i_ino);
+                return ret;
+        }
+
+        /* clear the DIO AIO unwritten flag */
+        io->flag = 0;
+        return ret;
+}
+/*
+ * work on completed aio dio IO, to convert unwritten extents to extents
+ */
+static void ext4_end_aio_dio_work(struct work_struct *work)
+{
+        ext4_io_end_t *io  = container_of(work, ext4_io_end_t, work);
+        struct inode *inode = io->inode;
+        int ret = 0;
+
+        mutex_lock(&inode->i_mutex);
+        ret = ext4_end_aio_dio_nolock(io);
+        if (ret >= 0) {
+                if (!list_empty(&io->list))
+                        list_del_init(&io->list);
+                ext4_free_io_end(io);
+        }
+        mutex_unlock(&inode->i_mutex);
+}
+/*
+ * This function is called from ext4_sync_file().
+ *
+ * When AIO DIO IO is completed, the work to convert unwritten
+ * extents to written is queued on workqueue but may not get immediately
+ * scheduled. When fsync is called, we need to ensure the
+ * conversion is complete before fsync returns.
+ * The inode keeps track of a list of completed AIO from DIO path
+ * that might needs to do the conversion. This function walks through
+ * the list and convert the related unwritten extents to written.
+ */
+int flush_aio_dio_completed_IO(struct inode *inode)
+{
+        ext4_io_end_t *io;
+        int ret = 0;
+        int ret2 = 0;
+
+        if (list_empty(&EXT4_I(inode)->i_aio_dio_complete_list))
+                return ret;
+
+        dump_aio_dio_list(inode);
+        while (!list_empty(&EXT4_I(inode)->i_aio_dio_complete_list)){
+                io = list_entry(EXT4_I(inode)->i_aio_dio_complete_list.next,
+                                ext4_io_end_t, list);
+                /*
+                 * Calling ext4_end_aio_dio_nolock() to convert completed
+                 * IO to written.
+                 *
+                 * When ext4_sync_file() is called, run_queue() may already
+                 * about to flush the work corresponding to this io structure.
+                 * It will be upset if it founds the io structure related
+                 * to the work-to-be schedule is freed.
+                 *
+                 * Thus we need to keep the io structure still valid here after
+                 * convertion finished. The io structure has a flag to
+                 * avoid double converting from both fsync and background work
+                 * queue work.
+                 */
+                ret = ext4_end_aio_dio_nolock(io);
+                if (ret < 0)
+                        ret2 = ret;
+                else
+                        list_del_init(&io->list);
+        }
+        return (ret2 < 0) ? ret2 : 0;
+}
+
+static ext4_io_end_t *ext4_init_io_end (struct inode *inode)
+{
+        ext4_io_end_t *io = NULL;
+
+        io = kmalloc(sizeof(*io), GFP_NOFS);
+
+        if (io) {
+                igrab(inode);
+                io->inode = inode;
+                io->flag = 0;
+                io->offset = 0;
+                io->size = 0;
+                io->error = 0;
+                INIT_WORK(&io->work, ext4_end_aio_dio_work);
+                INIT_LIST_HEAD(&io->list);
+        }
+
+        return io;
+}
+
+static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset,
+                            ssize_t size, void *private)
+{
+        ext4_io_end_t *io_end = iocb->private;
+        struct workqueue_struct *wq;
+
+        ext_debug("ext4_end_io_dio(): io_end 0x%p"
+                  "for inode %lu, iocb 0x%p, offset %llu, size %llu\n",
+                  iocb->private, io_end->inode->i_ino, iocb, offset,
+                  size);
+        /* if not async direct IO or dio with 0 bytes write, just return */
+        if (!io_end || !size)
+                return;
+
+        /* if not aio dio with unwritten extents, just free io and return */
+        if (io_end->flag != DIO_AIO_UNWRITTEN){
+                ext4_free_io_end(io_end);
+                iocb->private = NULL;
+                return;
+        }
+
+        io_end->offset = offset;
+        io_end->size = size;
+        wq = EXT4_SB(io_end->inode->i_sb)->dio_unwritten_wq;
+
+        /* queue the work to convert unwritten extents to written */
+        queue_work(wq, &io_end->work);
+
+        /* Add the io_end to per-inode completed aio dio list*/
+        list_add_tail(&io_end->list,
+                 &EXT4_I(io_end->inode)->i_aio_dio_complete_list);
+        iocb->private = NULL;
+}
+/*
+ * For ext4 extent files, ext4 will do direct-io write to holes,
+ * preallocated extents, and those write extend the file, no need to
+ * fall back to buffered IO.
+ *
+ * For holes, we fallocate those blocks, mark them as unintialized
+ * If those blocks were preallocated, we mark sure they are splited, but
+ * still keep the range to write as unintialized.
+ *
+ * The unwrritten extents will be converted to written when DIO is completed.
+ * For async direct IO, since the IO may still pending when return, we
+ * set up an end_io call back function, which will do the convertion
+ * when async direct IO completed.
+ *
+ * If the O_DIRECT write will extend the file then add this inode to the
+ * orphan list.  So recovery will truncate it back to the original size
+ * if the machine crashes during the write.
+ *
+ */
+static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb,
+                              const struct iovec *iov, loff_t offset,
+                              unsigned long nr_segs)
+{
+        struct file *file = iocb->ki_filp;
+        struct inode *inode = file->f_mapping->host;
+        ssize_t ret;
+        size_t count = iov_length(iov, nr_segs);
+
+        loff_t final_size = offset + count;
+        if (rw == WRITE && final_size <= inode->i_size) {
+                /*
+                 * We could direct write to holes and fallocate.
+                 *
+                 * Allocated blocks to fill the hole are marked as uninitialized
+                 * to prevent paralel buffered read to expose the stale data
+                 * before DIO complete the data IO.
+                 *
+                 * As to previously fallocated extents, ext4 get_block
+                 * will just simply mark the buffer mapped but still
+                 * keep the extents uninitialized.
+                 *
+                 * for non AIO case, we will convert those unwritten extents
+                 * to written after return back from blockdev_direct_IO.
+                 *
+                 * for async DIO, the conversion needs to be defered when
+                 * the IO is completed. The ext4 end_io callback function
+                 * will be called to take care of the conversion work.
+                 * Here for async case, we allocate an io_end structure to
+                 * hook to the iocb.
+                 */
+                iocb->private = NULL;
+                EXT4_I(inode)->cur_aio_dio = NULL;
+                if (!is_sync_kiocb(iocb)) {
+                        iocb->private = ext4_init_io_end(inode);
+                        if (!iocb->private)
+                                return -ENOMEM;
+                        /*
+                         * we save the io structure for current async
+                         * direct IO, so that later ext4_get_blocks()
+                         * could flag the io structure whether there
+                         * is a unwritten extents needs to be converted
+                         * when IO is completed.
+                         */
+                        EXT4_I(inode)->cur_aio_dio = iocb->private;
+                }
+
+                ret = blockdev_direct_IO(rw, iocb, inode,
+                                         inode->i_sb->s_bdev, iov,
+                                         offset, nr_segs,
+                                         ext4_get_block_dio_write,
+                                         ext4_end_io_dio);
+                if (iocb->private)
+                        EXT4_I(inode)->cur_aio_dio = NULL;
+                /*
+                 * The io_end structure takes a reference to the inode,
+                 * that structure needs to be destroyed and the
+                 * reference to the inode need to be dropped, when IO is
+                 * complete, even with 0 byte write, or failed.
+                 *
+                 * In the successful AIO DIO case, the io_end structure will be
+                 * desctroyed and the reference to the inode will be dropped
+                 * after the end_io call back function is called.
+                 *
+                 * In the case there is 0 byte write, or error case, since
+                 * VFS direct IO won't invoke the end_io call back function,
+                 * we need to free the end_io structure here.
+                 */
+                if (ret != -EIOCBQUEUED && ret <= 0 && iocb->private) {
+                        ext4_free_io_end(iocb->private);
+                        iocb->private = NULL;
+                } else if (ret > 0)
+                        /*
+                         * for non AIO case, since the IO is already
+                         * completed, we could do the convertion right here
+                         */
+                        ret = ext4_convert_unwritten_extents(inode,
+                                                                offset, ret);
+                return ret;
+        }
+
+        /* for write the the end of file case, we fall back to old way */
+        return ext4_ind_direct_IO(rw, iocb, iov, offset, nr_segs);
+}
+
+static ssize_t ext4_direct_IO(int rw, struct kiocb *iocb,
+                              const struct iovec *iov, loff_t offset,
+                              unsigned long nr_segs)
+{
+        struct file *file = iocb->ki_filp;
+        struct inode *inode = file->f_mapping->host;
+
+        if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)
+                return ext4_ext_direct_IO(rw, iocb, iov, offset, nr_segs);
+
+        return ext4_ind_direct_IO(rw, iocb, iov, offset, nr_segs);
+}
+
 /*
  * Pages can be marked dirty completely asynchronously from ext4's journalling
  * activity.  By filemap_sync_pte(), try_to_unmap_one(), etc.  We cannot do
@@ -3386,6 +3830,7 @@ static const struct address_space_operations ext4_ordered_aops = {
         .direct_IO              = ext4_direct_IO,
         .migratepage            = buffer_migrate_page,
         .is_partially_uptodate  = block_is_partially_uptodate,
+        .error_remove_page      = generic_error_remove_page,
 };
 
 static const struct address_space_operations ext4_writeback_aops = {
@@ -3401,6 +3846,7 @@ static const struct address_space_operations ext4_writeback_aops = {
         .direct_IO              = ext4_direct_IO,
         .migratepage            = buffer_migrate_page,
         .is_partially_uptodate  = block_is_partially_uptodate,
+        .error_remove_page      = generic_error_remove_page,
 };
 
 static const struct address_space_operations ext4_journalled_aops = {
@@ -3415,6 +3861,7 @@ static const struct address_space_operations ext4_journalled_aops = {
         .invalidatepage         = ext4_invalidatepage,
         .releasepage            = ext4_releasepage,
         .is_partially_uptodate  = block_is_partially_uptodate,
+        .error_remove_page      = generic_error_remove_page,
 };
 
 static const struct address_space_operations ext4_da_aops = {
@@ -3431,6 +3878,7 @@ static const struct address_space_operations ext4_da_aops = {
         .direct_IO              = ext4_direct_IO,
         .migratepage            = buffer_migrate_page,
         .is_partially_uptodate  = block_is_partially_uptodate,
+        .error_remove_page      = generic_error_remove_page,
 };
 
 void ext4_set_aops(struct inode *inode)
@@ -4547,8 +4995,7 @@ static int ext4_inode_blocks_set(handle_t *handle,
  */
 static int ext4_do_update_inode(handle_t *handle,
                                 struct inode *inode,
-                                struct ext4_iloc *iloc,
-                                int do_sync)
+                                struct ext4_iloc *iloc)
 {
         struct ext4_inode *raw_inode = ext4_raw_inode(iloc);
         struct ext4_inode_info *ei = EXT4_I(inode);
@@ -4649,22 +5096,10 @@ static int ext4_do_update_inode(handle_t *handle,
                 raw_inode->i_extra_isize = cpu_to_le16(ei->i_extra_isize);
         }
 
-        /*
-         * If we're not using a journal and we were called from
-         * ext4_write_inode() to sync the inode (making do_sync true),
-         * we can just use sync_dirty_buffer() directly to do our dirty
-         * work.  Testing s_journal here is a bit redundant but it's
-         * worth it to avoid potential future trouble.
-         */
-        if (EXT4_SB(inode->i_sb)->s_journal == NULL && do_sync) {
-                BUFFER_TRACE(bh, "call sync_dirty_buffer");
-                sync_dirty_buffer(bh);
-        } else {
-                BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
-                rc = ext4_handle_dirty_metadata(handle, inode, bh);
-                if (!err)
-                        err = rc;
-        }
+        BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
+        rc = ext4_handle_dirty_metadata(handle, inode, bh);
+        if (!err)
+                err = rc;
         ei->i_state &= ~EXT4_STATE_NEW;
 
 out_brelse:
@@ -4732,8 +5167,16 @@ int ext4_write_inode(struct inode *inode, int wait)
                 err = ext4_get_inode_loc(inode, &iloc);
                 if (err)
                         return err;
-                err = ext4_do_update_inode(EXT4_NOJOURNAL_HANDLE,
-                                           inode, &iloc, wait);
+                if (wait)
+                        sync_dirty_buffer(iloc.bh);
+                if (buffer_req(iloc.bh) && !buffer_uptodate(iloc.bh)) {
+                        ext4_error(inode->i_sb, __func__,
+                                   "IO error syncing inode, "
+                                   "inode=%lu, block=%llu",
+                                   inode->i_ino,
+                                   (unsigned long long)iloc.bh->b_blocknr);
+                        err = -EIO;
+                }
         }
         return err;
 }
@@ -5029,7 +5472,7 @@ int ext4_mark_iloc_dirty(handle_t *handle,
         get_bh(iloc->bh);
 
         /* ext4_do_update_inode() does jbd2_journal_dirty_metadata */
-        err = ext4_do_update_inode(handle, inode, iloc, 0);
+        err = ext4_do_update_inode(handle, inode, iloc);
         put_bh(iloc->bh);
         return err;
 }
@@ -5173,27 +5616,14 @@ int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode)
  */
 void ext4_dirty_inode(struct inode *inode)
 {
-        handle_t *current_handle = ext4_journal_current_handle();
         handle_t *handle;
 
-        if (!ext4_handle_valid(current_handle)) {
-                ext4_mark_inode_dirty(current_handle, inode);
-                return;
-        }
-
         handle = ext4_journal_start(inode, 2);
         if (IS_ERR(handle))
                 goto out;
-        if (current_handle &&
-                current_handle->h_transaction != handle->h_transaction) {
-                /* This task has a transaction open against a different fs */
-                printk(KERN_EMERG "%s: transactions do not match!\n",
-                       __func__);
-        } else {
-                jbd_debug(5, "marking dirty.  outer handle=%p\n",
-                                current_handle);
-                ext4_mark_inode_dirty(handle, inode);
-        }
+
+        ext4_mark_inode_dirty(handle, inode);
+
         ext4_journal_stop(handle);
 out:
         return;
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index e9c61896d605..bba12824defa 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2096,207 +2096,6 @@ out:
         return err;
 }
 
-#ifdef EXT4_MB_HISTORY
-struct ext4_mb_proc_session {
-        struct ext4_mb_history *history;
-        struct super_block *sb;
-        int start;
-        int max;
-};
-
-static void *ext4_mb_history_skip_empty(struct ext4_mb_proc_session *s,
-                                        struct ext4_mb_history *hs,
-                                        int first)
-{
-        if (hs == s->history + s->max)
-                hs = s->history;
-        if (!first && hs == s->history + s->start)
-                return NULL;
-        while (hs->orig.fe_len == 0) {
-                hs++;
-                if (hs == s->history + s->max)
-                        hs = s->history;
-                if (hs == s->history + s->start)
-                        return NULL;
-        }
-        return hs;
-}
-
-static void *ext4_mb_seq_history_start(struct seq_file *seq, loff_t *pos)
-{
-        struct ext4_mb_proc_session *s = seq->private;
-        struct ext4_mb_history *hs;
-        int l = *pos;
-
-        if (l == 0)
-                return SEQ_START_TOKEN;
-        hs = ext4_mb_history_skip_empty(s, s->history + s->start, 1);
-        if (!hs)
-                return NULL;
-        while (--l && (hs = ext4_mb_history_skip_empty(s, ++hs, 0)) != NULL);
-        return hs;
-}
-
-static void *ext4_mb_seq_history_next(struct seq_file *seq, void *v,
-                                      loff_t *pos)
-{
-        struct ext4_mb_proc_session *s = seq->private;
-        struct ext4_mb_history *hs = v;
-
-        ++*pos;
-        if (v == SEQ_START_TOKEN)
-                return ext4_mb_history_skip_empty(s, s->history + s->start, 1);
-        else
-                return ext4_mb_history_skip_empty(s, ++hs, 0);
-}
-
-static int ext4_mb_seq_history_show(struct seq_file *seq, void *v)
-{
-        char buf[25], buf2[25], buf3[25], *fmt;
-        struct ext4_mb_history *hs = v;
-
-        if (v == SEQ_START_TOKEN) {
-                seq_printf(seq, "%-5s %-8s %-23s %-23s %-23s %-5s "
-                                "%-5s %-2s %-6s %-5s %-5s %-6s\n",
-                          "pid", "inode", "original", "goal", "result", "found",
-                           "grps", "cr", "flags", "merge", "tail", "broken");
-                return 0;
-        }
-
-        if (hs->op == EXT4_MB_HISTORY_ALLOC) {
-                fmt = "%-5u %-8u %-23s %-23s %-23s %-5u %-5u %-2u "
-                        "0x%04x %-5s %-5u %-6u\n";
-                sprintf(buf2, "%u/%d/%u@%u", hs->result.fe_group,
-                        hs->result.fe_start, hs->result.fe_len,
-                        hs->result.fe_logical);
-                sprintf(buf, "%u/%d/%u@%u", hs->orig.fe_group,
-                        hs->orig.fe_start, hs->orig.fe_len,
-                        hs->orig.fe_logical);
-                sprintf(buf3, "%u/%d/%u@%u", hs->goal.fe_group,
-                        hs->goal.fe_start, hs->goal.fe_len,
-                        hs->goal.fe_logical);
-                seq_printf(seq, fmt, hs->pid, hs->ino, buf, buf3, buf2,
-                                hs->found, hs->groups, hs->cr, hs->flags,
-                                hs->merged ? "M" : "", hs->tail,
-                                hs->buddy ? 1 << hs->buddy : 0);
-        } else if (hs->op == EXT4_MB_HISTORY_PREALLOC) {
-                fmt = "%-5u %-8u %-23s %-23s %-23s\n";
-                sprintf(buf2, "%u/%d/%u@%u", hs->result.fe_group,
-                        hs->result.fe_start, hs->result.fe_len,
-                        hs->result.fe_logical);
-                sprintf(buf, "%u/%d/%u@%u", hs->orig.fe_group,
-                        hs->orig.fe_start, hs->orig.fe_len,
-                        hs->orig.fe_logical);
-                seq_printf(seq, fmt, hs->pid, hs->ino, buf, "", buf2);
-        } else if (hs->op == EXT4_MB_HISTORY_DISCARD) {
-                sprintf(buf2, "%u/%d/%u", hs->result.fe_group,
-                        hs->result.fe_start, hs->result.fe_len);
-                seq_printf(seq, "%-5u %-8u %-23s discard\n",
-                                hs->pid, hs->ino, buf2);
-        } else if (hs->op == EXT4_MB_HISTORY_FREE) {
-                sprintf(buf2, "%u/%d/%u", hs->result.fe_group,
-                        hs->result.fe_start, hs->result.fe_len);
-                seq_printf(seq, "%-5u %-8u %-23s free\n",
-                                hs->pid, hs->ino, buf2);
-        }
-        return 0;
-}
-
-static void ext4_mb_seq_history_stop(struct seq_file *seq, void *v)
-{
-}
-
-static const struct seq_operations ext4_mb_seq_history_ops = {
-        .start  = ext4_mb_seq_history_start,
-        .next   = ext4_mb_seq_history_next,
-        .stop   = ext4_mb_seq_history_stop,
-        .show   = ext4_mb_seq_history_show,
-};
-
-static int ext4_mb_seq_history_open(struct inode *inode, struct file *file)
-{
-        struct super_block *sb = PDE(inode)->data;
-        struct ext4_sb_info *sbi = EXT4_SB(sb);
-        struct ext4_mb_proc_session *s;
-        int rc;
-        int size;
-
-        if (unlikely(sbi->s_mb_history == NULL))
-                return -ENOMEM;
-        s = kmalloc(sizeof(*s), GFP_KERNEL);
-        if (s == NULL)
-                return -ENOMEM;
-        s->sb = sb;
-        size = sizeof(struct ext4_mb_history) * sbi->s_mb_history_max;
-        s->history = kmalloc(size, GFP_KERNEL);
-        if (s->history == NULL) {
-                kfree(s);
-                return -ENOMEM;
-        }
-
-        spin_lock(&sbi->s_mb_history_lock);
-        memcpy(s->history, sbi->s_mb_history, size);
-        s->max = sbi->s_mb_history_max;
-        s->start = sbi->s_mb_history_cur % s->max;
-        spin_unlock(&sbi->s_mb_history_lock);
-
-        rc = seq_open(file, &ext4_mb_seq_history_ops);
-        if (rc == 0) {
-                struct seq_file *m = (struct seq_file *)file->private_data;
-                m->private = s;
-        } else {
-                kfree(s->history);
-                kfree(s);
-        }
-        return rc;
-
-}
-
-static int ext4_mb_seq_history_release(struct inode *inode, struct file *file)
-{
-        struct seq_file *seq = (struct seq_file *)file->private_data;
-        struct ext4_mb_proc_session *s = seq->private;
-        kfree(s->history);
-        kfree(s);
-        return seq_release(inode, file);
-}
-
-static ssize_t ext4_mb_seq_history_write(struct file *file,
-                                const char __user *buffer,
-                                size_t count, loff_t *ppos)
-{
-        struct seq_file *seq = (struct seq_file *)file->private_data;
-        struct ext4_mb_proc_session *s = seq->private;
-        struct super_block *sb = s->sb;
-        char str[32];
-        int value;
-
-        if (count >= sizeof(str)) {
-                printk(KERN_ERR "EXT4-fs: %s string too long, max %u bytes\n",
-                                "mb_history", (int)sizeof(str));
-                return -EOVERFLOW;
-        }
-
-        if (copy_from_user(str, buffer, count))
-                return -EFAULT;
-
-        value = simple_strtol(str, NULL, 0);
-        if (value < 0)
-                return -ERANGE;
-        EXT4_SB(sb)->s_mb_history_filter = value;
-
-        return count;
-}
-
-static const struct file_operations ext4_mb_seq_history_fops = {
-        .owner          = THIS_MODULE,
-        .open           = ext4_mb_seq_history_open,
-        .read           = seq_read,
-        .write          = ext4_mb_seq_history_write,
-        .llseek         = seq_lseek,
-        .release        = ext4_mb_seq_history_release,
-};
-
 static void *ext4_mb_seq_groups_start(struct seq_file *seq, loff_t *pos)
 {
         struct super_block *sb = seq->private;
@@ -2396,82 +2195,6 @@ static const struct file_operations ext4_mb_seq_groups_fops = {
         .release        = seq_release,
 };
 
-static void ext4_mb_history_release(struct super_block *sb)
-{
-        struct ext4_sb_info *sbi = EXT4_SB(sb);
-
-        if (sbi->s_proc != NULL) {
-                remove_proc_entry("mb_groups", sbi->s_proc);
-                if (sbi->s_mb_history_max)
-                        remove_proc_entry("mb_history", sbi->s_proc);
-        }
-        kfree(sbi->s_mb_history);
-}
-
-static void ext4_mb_history_init(struct super_block *sb)
-{
-        struct ext4_sb_info *sbi = EXT4_SB(sb);
-        int i;
-
-        if (sbi->s_proc != NULL) {
-                if (sbi->s_mb_history_max)
-                        proc_create_data("mb_history", S_IRUGO, sbi->s_proc,
-                                         &ext4_mb_seq_history_fops, sb);
-                proc_create_data("mb_groups", S_IRUGO, sbi->s_proc,
-                                 &ext4_mb_seq_groups_fops, sb);
-        }
-
-        sbi->s_mb_history_cur = 0;
-        spin_lock_init(&sbi->s_mb_history_lock);
-        i = sbi->s_mb_history_max * sizeof(struct ext4_mb_history);
-        sbi->s_mb_history = i ? kzalloc(i, GFP_KERNEL) : NULL;
-        /* if we can't allocate history, then we simple won't use it */
-}
-
-static noinline_for_stack void
-ext4_mb_store_history(struct ext4_allocation_context *ac)
-{
-        struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb);
-        struct ext4_mb_history h;
-
-        if (sbi->s_mb_history == NULL)
-                return;
-
-        if (!(ac->ac_op & sbi->s_mb_history_filter))
-                return;
-
-        h.op = ac->ac_op;
-        h.pid = current->pid;
-        h.ino = ac->ac_inode ? ac->ac_inode->i_ino : 0;
-        h.orig = ac->ac_o_ex;
-        h.result = ac->ac_b_ex;
-        h.flags = ac->ac_flags;
-        h.found = ac->ac_found;
-        h.groups = ac->ac_groups_scanned;
-        h.cr = ac->ac_criteria;
-        h.tail = ac->ac_tail;
-        h.buddy = ac->ac_buddy;
-        h.merged = 0;
-        if (ac->ac_op == EXT4_MB_HISTORY_ALLOC) {
-                if (ac->ac_g_ex.fe_start == ac->ac_b_ex.fe_start &&
-                                ac->ac_g_ex.fe_group == ac->ac_b_ex.fe_group)
-                        h.merged = 1;
-                h.goal = ac->ac_g_ex;
-                h.result = ac->ac_f_ex;
-        }
-
-        spin_lock(&sbi->s_mb_history_lock);
-        memcpy(sbi->s_mb_history + sbi->s_mb_history_cur, &h, sizeof(h));
-        if (++sbi->s_mb_history_cur >= sbi->s_mb_history_max)
-                sbi->s_mb_history_cur = 0;
-        spin_unlock(&sbi->s_mb_history_lock);
-}
-
-#else
-#define ext4_mb_history_release(sb)
-#define ext4_mb_history_init(sb)
-#endif
-
 
 /* Create and initialize ext4_group_info data for the given group. */
 int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group,
@@ -2690,7 +2413,6 @@ int ext4_mb_init(struct super_block *sb, int needs_recovery)
         sbi->s_mb_stats = MB_DEFAULT_STATS;
         sbi->s_mb_stream_request = MB_DEFAULT_STREAM_THRESHOLD;
         sbi->s_mb_order2_reqs = MB_DEFAULT_ORDER2_REQS;
-        sbi->s_mb_history_filter = EXT4_MB_HISTORY_DEFAULT;
         sbi->s_mb_group_prealloc = MB_DEFAULT_GROUP_PREALLOC;
 
         sbi->s_locality_groups = alloc_percpu(struct ext4_locality_group);
@@ -2708,12 +2430,12 @@ int ext4_mb_init(struct super_block *sb, int needs_recovery)
                 spin_lock_init(&lg->lg_prealloc_lock);
         }
 
-        ext4_mb_history_init(sb);
+        if (sbi->s_proc)
+                proc_create_data("mb_groups", S_IRUGO, sbi->s_proc,
+                                 &ext4_mb_seq_groups_fops, sb);
 
         if (sbi->s_journal)
                 sbi->s_journal->j_commit_callback = release_blocks_on_commit;
-
-        printk(KERN_INFO "EXT4-fs: mballoc enabled\n");
         return 0;
 }
 
@@ -2790,7 +2512,8 @@ int ext4_mb_release(struct super_block *sb)
         }
 
         free_percpu(sbi->s_locality_groups);
-        ext4_mb_history_release(sb);
+        if (sbi->s_proc)
+                remove_proc_entry("mb_groups", sbi->s_proc);
 
         return 0;
 }
@@ -3276,7 +2999,10 @@ static void ext4_mb_collect_stats(struct ext4_allocation_context *ac)
                         atomic_inc(&sbi->s_bal_breaks);
         }
 
-        ext4_mb_store_history(ac);
+        if (ac->ac_op == EXT4_MB_HISTORY_ALLOC)
+                trace_ext4_mballoc_alloc(ac);
+        else
+                trace_ext4_mballoc_prealloc(ac);
 }
 
 /*
@@ -3776,7 +3502,6 @@ ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh,
         if (ac) {
                 ac->ac_sb = sb;
                 ac->ac_inode = pa->pa_inode;
-                ac->ac_op = EXT4_MB_HISTORY_DISCARD;
         }
 
         while (bit < end) {
@@ -3796,7 +3521,7 @@ ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh,
                         ac->ac_b_ex.fe_start = bit;
                         ac->ac_b_ex.fe_len = next - bit;
                         ac->ac_b_ex.fe_logical = 0;
-                        ext4_mb_store_history(ac);
+                        trace_ext4_mballoc_discard(ac);
                 }
 
                 trace_ext4_mb_release_inode_pa(ac, pa, grp_blk_start + bit,
@@ -3831,9 +3556,6 @@ ext4_mb_release_group_pa(struct ext4_buddy *e4b,
         ext4_group_t group;
         ext4_grpblk_t bit;
 
-        if (ac)
-                ac->ac_op = EXT4_MB_HISTORY_DISCARD;
-
         trace_ext4_mb_release_group_pa(ac, pa);
         BUG_ON(pa->pa_deleted == 0);
         ext4_get_group_no_and_offset(sb, pa->pa_pstart, &group, &bit);
@@ -3848,7 +3570,7 @@ ext4_mb_release_group_pa(struct ext4_buddy *e4b,
                 ac->ac_b_ex.fe_start = bit;
                 ac->ac_b_ex.fe_len = pa->pa_len;
                 ac->ac_b_ex.fe_logical = 0;
-                ext4_mb_store_history(ac);
+                trace_ext4_mballoc_discard(ac);
         }
 
         return 0;
@@ -4189,7 +3911,6 @@ static void ext4_mb_group_or_file(struct ext4_allocation_context *ac)
         size = ac->ac_o_ex.fe_logical + ac->ac_o_ex.fe_len;
         isize = (i_size_read(ac->ac_inode) + ac->ac_sb->s_blocksize - 1)
                 >> bsbits;
-        size = max(size, isize);
 
         if ((size == isize) &&
             !ext4_fs_is_busy(sbi) &&
@@ -4199,6 +3920,7 @@ static void ext4_mb_group_or_file(struct ext4_allocation_context *ac)
         }
 
         /* don't use group allocation for large files */
+        size = max(size, isize);
         if (size >= sbi->s_mb_stream_request) {
                 ac->ac_flags |= EXT4_MB_STREAM_ALLOC;
                 return;
@@ -4739,7 +4461,6 @@ void ext4_mb_free_blocks(handle_t *handle, struct inode *inode,
 
         ac = kmem_cache_alloc(ext4_ac_cachep, GFP_NOFS);
         if (ac) {
-                ac->ac_op = EXT4_MB_HISTORY_FREE;
                 ac->ac_inode = inode;
                 ac->ac_sb = sb;
         }
@@ -4806,7 +4527,7 @@ do_more:
                 ac->ac_b_ex.fe_group = block_group;
                 ac->ac_b_ex.fe_start = bit;
                 ac->ac_b_ex.fe_len = count;
-                ext4_mb_store_history(ac);
+                trace_ext4_mballoc_free(ac);
         }
 
         err = ext4_mb_load_buddy(sb, block_group, &e4b);
diff --git a/fs/ext4/mballoc.h b/fs/ext4/mballoc.h
index 188d3d709b24..0ca811061bc7 100644
--- a/fs/ext4/mballoc.h
+++ b/fs/ext4/mballoc.h
@@ -52,18 +52,8 @@ extern u8 mb_enable_debug;
 #define mb_debug(n, fmt, a...)
 #endif
 
-/*
- * with EXT4_MB_HISTORY mballoc stores last N allocations in memory
- * and you can monitor it in /proc/fs/ext4/<dev>/mb_history
- */
-#define EXT4_MB_HISTORY
 #define EXT4_MB_HISTORY_ALLOC           1       /* allocation */
 #define EXT4_MB_HISTORY_PREALLOC        2       /* preallocated blocks used */
-#define EXT4_MB_HISTORY_DISCARD         4       /* preallocation discarded */
-#define EXT4_MB_HISTORY_FREE            8       /* free */
-
-#define EXT4_MB_HISTORY_DEFAULT         (EXT4_MB_HISTORY_ALLOC | \
-                                         EXT4_MB_HISTORY_PREALLOC)
 
 /*
  * How long mballoc can look for a best extent (in found extents)
@@ -84,7 +74,7 @@ extern u8 mb_enable_debug;
  * with 'ext4_mb_stats' allocator will collect stats that will be
  * shown at umount. The collecting costs though!
  */
-#define MB_DEFAULT_STATS                1
+#define MB_DEFAULT_STATS                0
 
 /*
  * files smaller than MB_DEFAULT_STREAM_THRESHOLD are served
@@ -217,22 +207,6 @@ struct ext4_allocation_context {
 #define AC_STATUS_FOUND         2
 #define AC_STATUS_BREAK         3
 
-struct ext4_mb_history {
-        struct ext4_free_extent orig;   /* orig allocation */
-        struct ext4_free_extent goal;   /* goal allocation */
-        struct ext4_free_extent result; /* result allocation */
-        unsigned pid;
-        unsigned ino;
-        __u16 found;    /* how many extents have been found */
-        __u16 groups;   /* how many groups have been scanned */
-        __u16 tail;     /* what tail broke some buddy */
-        __u16 buddy;    /* buddy the tail ^^^ broke */
-        __u16 flags;
-        __u8 cr:3;      /* which phase the result extent was found at */
-        __u8 op:4;
-        __u8 merged:1;
-};
-
 struct ext4_buddy {
         struct page *bd_buddy_page;
         void *bd_buddy;
@@ -247,13 +221,6 @@ struct ext4_buddy {
 #define EXT4_MB_BITMAP(e4b)     ((e4b)->bd_bitmap)
 #define EXT4_MB_BUDDY(e4b)      ((e4b)->bd_buddy)
 
-#ifndef EXT4_MB_HISTORY
-static inline void ext4_mb_store_history(struct ext4_allocation_context *ac)
-{
-        return;
-}
-#endif
-
 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
 
 static inline ext4_fsblk_t ext4_grp_offs_to_block(struct super_block *sb,
diff --git a/fs/ext4/migrate.c b/fs/ext4/migrate.c
index bf519f239ae6..a93d5b80f3e2 100644
--- a/fs/ext4/migrate.c
+++ b/fs/ext4/migrate.c
@@ -75,7 +75,7 @@ static int finish_range(handle_t *handle, struct inode *inode,
                                 goto err_out;
                 }
         }
-        retval = ext4_ext_insert_extent(handle, inode, path, &newext);
+        retval = ext4_ext_insert_extent(handle, inode, path, &newext, 0);
 err_out:
         if (path) {
                 ext4_ext_drop_refs(path);
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index c07a2915e40b..25b6b1457360 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -322,7 +322,7 @@ mext_insert_across_blocks(handle_t *handle, struct inode *orig_inode,
                         goto out;
 
                 if (ext4_ext_insert_extent(handle, orig_inode,
-                                        orig_path, new_ext))
+                                        orig_path, new_ext, 0))
                         goto out;
         }
 
@@ -333,7 +333,7 @@ mext_insert_across_blocks(handle_t *handle, struct inode *orig_inode,
                         goto out;
 
                 if (ext4_ext_insert_extent(handle, orig_inode,
-                                           orig_path, end_ext))
+                                           orig_path, end_ext, 0))
                         goto out;
         }
 out:
@@ -1001,14 +1001,6 @@ mext_check_arguments(struct inode *orig_inode,
                 return -EINVAL;
         }
 
-        /* orig and donor should be different file */
-        if (orig_inode->i_ino == donor_inode->i_ino) {
-                ext4_debug("ext4 move extent: The argument files should not "
-                        "be same file [ino:orig %lu, donor %lu]\n",
-                        orig_inode->i_ino, donor_inode->i_ino);
-                return -EINVAL;
-        }
-
         /* Ext4 move extent supports only extent based file */
         if (!(EXT4_I(orig_inode)->i_flags & EXT4_EXTENTS_FL)) {
                 ext4_debug("ext4 move extent: orig file is not extents "
@@ -1232,6 +1224,14 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp,
         int block_len_in_page;
         int uninit;
 
+        /* orig and donor should be different file */
+        if (orig_inode->i_ino == donor_inode->i_ino) {
+                ext4_debug("ext4 move extent: The argument files should not "
+                        "be same file [ino:orig %lu, donor %lu]\n",
+                        orig_inode->i_ino, donor_inode->i_ino);
+                return -EINVAL;
+        }
+
         /* protect orig and donor against a truncate */
         ret1 = mext_inode_double_lock(orig_inode, donor_inode);
         if (ret1 < 0)
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 42f81d285cd5..7c8fe80bacdd 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2076,7 +2076,8 @@ int ext4_orphan_del(handle_t *handle, struct inode *inode)
         struct ext4_iloc iloc;
         int err = 0;
 
-        if (!ext4_handle_valid(handle))
+        /* ext4_handle_valid() assumes a valid handle_t pointer */
+        if (handle && !ext4_handle_valid(handle))
                 return 0;
 
         mutex_lock(&EXT4_SB(inode->i_sb)->s_orphan_lock);
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index a6b1ab734728..312211ee05af 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -50,13 +50,6 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/ext4.h>
 
-static int default_mb_history_length = 1000;
-
-module_param_named(default_mb_history_length, default_mb_history_length,
-                   int, 0644);
-MODULE_PARM_DESC(default_mb_history_length,
-                 "Default number of entries saved for mb_history");
-
 struct proc_dir_entry *ext4_proc_root;
 static struct kset *ext4_kset;
 
@@ -189,6 +182,36 @@ void ext4_itable_unused_set(struct super_block *sb,
                 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
 }
 
+
+/* Just increment the non-pointer handle value */
+static handle_t *ext4_get_nojournal(void)
+{
+        handle_t *handle = current->journal_info;
+        unsigned long ref_cnt = (unsigned long)handle;
+
+        BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
+
+        ref_cnt++;
+        handle = (handle_t *)ref_cnt;
+
+        current->journal_info = handle;
+        return handle;
+}
+
+
+/* Decrement the non-pointer handle value */
+static void ext4_put_nojournal(handle_t *handle)
+{
+        unsigned long ref_cnt = (unsigned long)handle;
+
+        BUG_ON(ref_cnt == 0);
+
+        ref_cnt--;
+        handle = (handle_t *)ref_cnt;
+
+        current->journal_info = handle;
+}
+
 /*
  * Wrappers for jbd2_journal_start/end.
  *
@@ -215,11 +238,7 @@ handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
                 }
                 return jbd2_journal_start(journal, nblocks);
         }
-        /*
-         * We're not journaling, return the appropriate indication.
-         */
-        current->journal_info = EXT4_NOJOURNAL_HANDLE;
-        return current->journal_info;
+        return ext4_get_nojournal();
 }
 
 /*
@@ -235,11 +254,7 @@ int __ext4_journal_stop(const char *where, handle_t *handle)
         int rc;
 
         if (!ext4_handle_valid(handle)) {
-                /*
-                 * Do this here since we don't call jbd2_journal_stop() in
-                 * no-journal mode.
-                 */
-                current->journal_info = NULL;
+                ext4_put_nojournal(handle);
                 return 0;
         }
         sb = handle->h_transaction->t_journal->j_private;
@@ -580,6 +595,9 @@ static void ext4_put_super(struct super_block *sb)
         struct ext4_super_block *es = sbi->s_es;
         int i, err;
 
+        flush_workqueue(sbi->dio_unwritten_wq);
+        destroy_workqueue(sbi->dio_unwritten_wq);
+
         lock_super(sb);
         lock_kernel();
         if (sb->s_dirt)
@@ -684,6 +702,8 @@ static struct inode *ext4_alloc_inode(struct super_block *sb)
         ei->i_allocated_meta_blocks = 0;
         ei->i_delalloc_reserved_flag = 0;
         spin_lock_init(&(ei->i_block_reservation_lock));
+        INIT_LIST_HEAD(&ei->i_aio_dio_complete_list);
+        ei->cur_aio_dio = NULL;
 
         return &ei->vfs_inode;
 }
@@ -964,7 +984,7 @@ static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
 static ssize_t ext4_quota_write(struct super_block *sb, int type,
                                 const char *data, size_t len, loff_t off);
 
-static struct dquot_operations ext4_quota_operations = {
+static const struct dquot_operations ext4_quota_operations = {
         .initialize     = dquot_initialize,
         .drop           = dquot_drop,
         .alloc_space    = dquot_alloc_space,
@@ -985,7 +1005,7 @@ static struct dquot_operations ext4_quota_operations = {
         .destroy_dquot  = dquot_destroy,
 };
 
-static struct quotactl_ops ext4_qctl_operations = {
+static const struct quotactl_ops ext4_qctl_operations = {
         .quota_on       = ext4_quota_on,
         .quota_off      = vfs_quota_off,
         .quota_sync     = vfs_quota_sync,
@@ -1052,7 +1072,7 @@ enum {
         Opt_journal_update, Opt_journal_dev,
         Opt_journal_checksum, Opt_journal_async_commit,
         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
-        Opt_data_err_abort, Opt_data_err_ignore, Opt_mb_history_length,
+        Opt_data_err_abort, Opt_data_err_ignore,
         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
         Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err, Opt_resize,
@@ -1099,7 +1119,6 @@ static const match_table_t tokens = {
         {Opt_data_writeback, "data=writeback"},
         {Opt_data_err_abort, "data_err=abort"},
         {Opt_data_err_ignore, "data_err=ignore"},
-        {Opt_mb_history_length, "mb_history_length=%u"},
         {Opt_offusrjquota, "usrjquota="},
         {Opt_usrjquota, "usrjquota=%s"},
         {Opt_offgrpjquota, "grpjquota="},
@@ -1340,13 +1359,6 @@ static int parse_options(char *options, struct super_block *sb,
                 case Opt_data_err_ignore:
                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
                         break;
-                case Opt_mb_history_length:
-                        if (match_int(&args[0], &option))
-                                return 0;
-                        if (option < 0)
-                                return 0;
-                        sbi->s_mb_history_max = option;
-                        break;
 #ifdef CONFIG_QUOTA
                 case Opt_usrjquota:
                         qtype = USRQUOTA;
@@ -1646,13 +1658,6 @@ static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
                         EXT4_INODES_PER_GROUP(sb),
                         sbi->s_mount_opt);
 
-        if (EXT4_SB(sb)->s_journal) {
-                ext4_msg(sb, KERN_INFO, "%s journal on %s",
-                       EXT4_SB(sb)->s_journal->j_inode ? "internal" :
-                       "external", EXT4_SB(sb)->s_journal->j_devname);
-        } else {
-                ext4_msg(sb, KERN_INFO, "no journal");
-        }
         return res;
 }
 
@@ -2197,6 +2202,7 @@ EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
+EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
 
 static struct attribute *ext4_attrs[] = {
         ATTR_LIST(delayed_allocation_blocks),
@@ -2210,6 +2216,7 @@ static struct attribute *ext4_attrs[] = {
         ATTR_LIST(mb_order2_req),
         ATTR_LIST(mb_stream_req),
         ATTR_LIST(mb_group_prealloc),
+        ATTR_LIST(max_writeback_mb_bump),
         NULL,
 };
 
@@ -2413,7 +2420,6 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
         sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
         sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
         sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
-        sbi->s_mb_history_max = default_mb_history_length;
 
         set_opt(sbi->s_mount_opt, BARRIER);
 
@@ -2679,6 +2685,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
         }
 
         sbi->s_stripe = ext4_get_stripe_size(sbi);
+        sbi->s_max_writeback_mb_bump = 128;
 
         /*
          * set up enough so that it can read an inode
@@ -2798,6 +2805,12 @@ no_journal:
                         clear_opt(sbi->s_mount_opt, NOBH);
                 }
         }
+        EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten");
+        if (!EXT4_SB(sb)->dio_unwritten_wq) {
+                printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
+                goto failed_mount_wq;
+        }
+
         /*
          * The jbd2_journal_load will have done any necessary log recovery,
          * so we can safely mount the rest of the filesystem now.
@@ -2849,12 +2862,12 @@ no_journal:
                          "available");
         }
 
-        if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
+        if (test_opt(sb, DELALLOC) &&
+            (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
                 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - "
                          "requested data journaling mode");
                 clear_opt(sbi->s_mount_opt, DELALLOC);
-        } else if (test_opt(sb, DELALLOC))
-                ext4_msg(sb, KERN_INFO, "delayed allocation enabled");
+        }
 
         err = ext4_setup_system_zone(sb);
         if (err) {
@@ -2910,6 +2923,8 @@ cantfind_ext4:
 
 failed_mount4:
         ext4_msg(sb, KERN_ERR, "mount failed");
+        destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
+failed_mount_wq:
         ext4_release_system_zone(sb);
         if (sbi->s_journal) {
                 jbd2_journal_destroy(sbi->s_journal);
@@ -3164,9 +3179,7 @@ static int ext4_load_journal(struct super_block *sb,
                         return -EINVAL;
         }
 
-        if (journal->j_flags & JBD2_BARRIER)
-                ext4_msg(sb, KERN_INFO, "barriers enabled");
-        else
+        if (!(journal->j_flags & JBD2_BARRIER))
                 ext4_msg(sb, KERN_INFO, "barriers disabled");
 
         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
@@ -3361,11 +3374,13 @@ static int ext4_sync_fs(struct super_block *sb, int wait)
 {
         int ret = 0;
         tid_t target;
+        struct ext4_sb_info *sbi = EXT4_SB(sb);
 
         trace_ext4_sync_fs(sb, wait);
-        if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
+        flush_workqueue(sbi->dio_unwritten_wq);
+        if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
                 if (wait)
-                        jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
+                        jbd2_log_wait_commit(sbi->s_journal, target);
         }
         return ret;
 }
@@ -3951,27 +3966,6 @@ static struct file_system_type ext4_fs_type = {
         .fs_flags       = FS_REQUIRES_DEV,
 };
 
-#ifdef CONFIG_EXT4DEV_COMPAT
-static int ext4dev_get_sb(struct file_system_type *fs_type, int flags,
-                          const char *dev_name, void *data,struct vfsmount *mnt)
-{
-        printk(KERN_WARNING "EXT4-fs (%s): Update your userspace programs "
-               "to mount using ext4\n", dev_name);
-        printk(KERN_WARNING "EXT4-fs (%s): ext4dev backwards compatibility "
-               "will go away by 2.6.31\n", dev_name);
-        return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt);
-}
-
-static struct file_system_type ext4dev_fs_type = {
-        .owner          = THIS_MODULE,
-        .name           = "ext4dev",
-        .get_sb         = ext4dev_get_sb,
-        .kill_sb        = kill_block_super,
-        .fs_flags       = FS_REQUIRES_DEV,
-};
-MODULE_ALIAS("ext4dev");
-#endif
-
 static int __init init_ext4_fs(void)
 {
         int err;
@@ -3996,13 +3990,6 @@ static int __init init_ext4_fs(void)
         err = register_filesystem(&ext4_fs_type);
         if (err)
                 goto out;
-#ifdef CONFIG_EXT4DEV_COMPAT
-        err = register_filesystem(&ext4dev_fs_type);
-        if (err) {
-                unregister_filesystem(&ext4_fs_type);
-                goto out;
-        }
-#endif
         return 0;
 out:
         destroy_inodecache();
@@ -4021,9 +4008,6 @@ out4:
 static void __exit exit_ext4_fs(void)
 {
         unregister_filesystem(&ext4_fs_type);
-#ifdef CONFIG_EXT4DEV_COMPAT
-        unregister_filesystem(&ext4dev_fs_type);
-#endif
         destroy_inodecache();
         exit_ext4_xattr();
         exit_ext4_mballoc();
diff --git a/fs/fat/fat.h b/fs/fat/fat.h
index adb0e72a176d..7db0979c6b72 100644
--- a/fs/fat/fat.h
+++ b/fs/fat/fat.h
@@ -323,7 +323,7 @@ extern int fat_flush_inodes(struct super_block *sb, struct inode *i1,
 /* fat/misc.c */
 extern void fat_fs_error(struct super_block *s, const char *fmt, ...)
         __attribute__ ((format (printf, 2, 3))) __cold;
-extern void fat_clusters_flush(struct super_block *sb);
+extern int fat_clusters_flush(struct super_block *sb);
 extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster);
 extern void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec *ts,
                               __le16 __time, __le16 __date, u8 time_cs);
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 8970d8c49bb0..76b7961ab663 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -451,12 +451,16 @@ static void fat_write_super(struct super_block *sb)
 
 static int fat_sync_fs(struct super_block *sb, int wait)
 {
-        lock_super(sb);
-        fat_clusters_flush(sb);
-        sb->s_dirt = 0;
-        unlock_super(sb);
+        int err = 0;
 
-        return 0;
+        if (sb->s_dirt) {
+                lock_super(sb);
+                sb->s_dirt = 0;
+                err = fat_clusters_flush(sb);
+                unlock_super(sb);
+        }
+
+        return err;
 }
 
 static void fat_put_super(struct super_block *sb)
@@ -470,19 +474,11 @@ static void fat_put_super(struct super_block *sb)
 
         iput(sbi->fat_inode);
 
-        if (sbi->nls_disk) {
-                unload_nls(sbi->nls_disk);
-                sbi->nls_disk = NULL;
-                sbi->options.codepage = fat_default_codepage;
-        }
-        if (sbi->nls_io) {
-                unload_nls(sbi->nls_io);
-                sbi->nls_io = NULL;
-        }
-        if (sbi->options.iocharset != fat_default_iocharset) {
+        unload_nls(sbi->nls_disk);
+        unload_nls(sbi->nls_io);
+
+        if (sbi->options.iocharset != fat_default_iocharset)
                 kfree(sbi->options.iocharset);
-                sbi->options.iocharset = fat_default_iocharset;
-        }
 
         sb->s_fs_info = NULL;
         kfree(sbi);
@@ -820,7 +816,7 @@ static int fat_show_options(struct seq_file *m, struct vfsmount *mnt)
                         seq_puts(m, ",shortname=mixed");
                         break;
                 case VFAT_SFN_DISPLAY_LOWER | VFAT_SFN_CREATE_WIN95:
-                        /* seq_puts(m, ",shortname=lower"); */
+                        seq_puts(m, ",shortname=lower");
                         break;
                 default:
                         seq_puts(m, ",shortname=unknown");
@@ -971,7 +967,7 @@ static int parse_options(char *options, int is_vfat, int silent, int *debug,
         opts->codepage = fat_default_codepage;
         opts->iocharset = fat_default_iocharset;
         if (is_vfat) {
-                opts->shortname = VFAT_SFN_DISPLAY_LOWER|VFAT_SFN_CREATE_WIN95;
+                opts->shortname = VFAT_SFN_DISPLAY_WINNT|VFAT_SFN_CREATE_WIN95;
                 opts->rodir = 0;
         } else {
                 opts->shortname = 0;
diff --git a/fs/fat/misc.c b/fs/fat/misc.c
index 4e35be873e09..0f55f5cb732f 100644
--- a/fs/fat/misc.c
+++ b/fs/fat/misc.c
@@ -43,19 +43,19 @@ EXPORT_SYMBOL_GPL(fat_fs_error);
 
 /* Flushes the number of free clusters on FAT32 */
 /* XXX: Need to write one per FSINFO block.  Currently only writes 1 */
-void fat_clusters_flush(struct super_block *sb)
+int fat_clusters_flush(struct super_block *sb)
 {
         struct msdos_sb_info *sbi = MSDOS_SB(sb);
         struct buffer_head *bh;
         struct fat_boot_fsinfo *fsinfo;
 
         if (sbi->fat_bits != 32)
-                return;
+                return 0;
 
         bh = sb_bread(sb, sbi->fsinfo_sector);
         if (bh == NULL) {
                 printk(KERN_ERR "FAT: bread failed in fat_clusters_flush\n");
-                return;
+                return -EIO;
         }
 
         fsinfo = (struct fat_boot_fsinfo *)bh->b_data;
@@ -74,6 +74,8 @@ void fat_clusters_flush(struct super_block *sb)
                 mark_buffer_dirty(bh);
         }
         brelse(bh);
+
+        return 0;
 }
 
 /*
diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index cb6e83557112..f565f24019b5 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -499,17 +499,10 @@ xlate_to_uni(const unsigned char *name, int len, unsigned char *outname,
         int charlen;
 
         if (utf8) {
-                int name_len = strlen(name);
-
-                *outlen = utf8s_to_utf16s(name, PATH_MAX, (wchar_t *) outname);
-
-                /*
-                 * We stripped '.'s before and set len appropriately,
-                 * but utf8s_to_utf16s doesn't care about len
-                 */
-                *outlen -= (name_len - len);
-
-                if (*outlen > 255)
+                *outlen = utf8s_to_utf16s(name, len, (wchar_t *)outname);
+                if (*outlen < 0)
+                        return *outlen;
+                else if (*outlen > 255)
                         return -ENAMETOOLONG;
 
                 op = &outname[*outlen * sizeof(wchar_t)];
diff --git a/fs/fcntl.c b/fs/fcntl.c
index ae413086db97..fc089f2f7f56 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -263,6 +263,79 @@ pid_t f_getown(struct file *filp)
         return pid;
 }
 
+static int f_setown_ex(struct file *filp, unsigned long arg)
+{
+        struct f_owner_ex * __user owner_p = (void * __user)arg;
+        struct f_owner_ex owner;
+        struct pid *pid;
+        int type;
+        int ret;
+
+        ret = copy_from_user(&owner, owner_p, sizeof(owner));
+        if (ret)
+                return ret;
+
+        switch (owner.type) {
+        case F_OWNER_TID:
+                type = PIDTYPE_MAX;
+                break;
+
+        case F_OWNER_PID:
+                type = PIDTYPE_PID;
+                break;
+
+        case F_OWNER_GID:
+                type = PIDTYPE_PGID;
+                break;
+
+        default:
+                return -EINVAL;
+        }
+
+        rcu_read_lock();
+        pid = find_vpid(owner.pid);
+        if (owner.pid && !pid)
+                ret = -ESRCH;
+        else
+                ret = __f_setown(filp, pid, type, 1);
+        rcu_read_unlock();
+
+        return ret;
+}
+
+static int f_getown_ex(struct file *filp, unsigned long arg)
+{
+        struct f_owner_ex * __user owner_p = (void * __user)arg;
+        struct f_owner_ex owner;
+        int ret = 0;
+
+        read_lock(&filp->f_owner.lock);
+        owner.pid = pid_vnr(filp->f_owner.pid);
+        switch (filp->f_owner.pid_type) {
+        case PIDTYPE_MAX:
+                owner.type = F_OWNER_TID;
+                break;
+
+        case PIDTYPE_PID:
+                owner.type = F_OWNER_PID;
+                break;
+
+        case PIDTYPE_PGID:
+                owner.type = F_OWNER_GID;
+                break;
+
+        default:
+                WARN_ON(1);
+                ret = -EINVAL;
+                break;
+        }
+        read_unlock(&filp->f_owner.lock);
+
+        if (!ret)
+                ret = copy_to_user(owner_p, &owner, sizeof(owner));
+        return ret;
+}
+
 static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
                 struct file *filp)
 {
@@ -313,6 +386,12 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
         case F_SETOWN:
                 err = f_setown(filp, arg, 1);
                 break;
+        case F_GETOWN_EX:
+                err = f_getown_ex(filp, arg);
+                break;
+        case F_SETOWN_EX:
+                err = f_setown_ex(filp, arg);
+                break;
         case F_GETSIG:
                 err = filp->f_owner.signum;
                 break;
@@ -428,8 +507,7 @@ static inline int sigio_perm(struct task_struct *p,
 
 static void send_sigio_to_task(struct task_struct *p,
                                struct fown_struct *fown,
-                               int fd,
-                               int reason)
+                               int fd, int reason, int group)
 {
         /*
          * F_SETSIG can change ->signum lockless in parallel, make
@@ -461,11 +539,11 @@ static void send_sigio_to_task(struct task_struct *p,
                         else
                                 si.si_band = band_table[reason - POLL_IN];
                         si.si_fd    = fd;
-                        if (!group_send_sig_info(signum, &si, p))
+                        if (!do_send_sig_info(signum, &si, p, group))
                                 break;
                 /* fall-through: fall back on the old plain SIGIO signal */
                 case 0:
-                        group_send_sig_info(SIGIO, SEND_SIG_PRIV, p);
+                        do_send_sig_info(SIGIO, SEND_SIG_PRIV, p, group);
         }
 }
 
@@ -474,16 +552,23 @@ void send_sigio(struct fown_struct *fown, int fd, int band)
         struct task_struct *p;
         enum pid_type type;
         struct pid *pid;
+        int group = 1;
         
         read_lock(&fown->lock);
+
         type = fown->pid_type;
+        if (type == PIDTYPE_MAX) {
+                group = 0;
+                type = PIDTYPE_PID;
+        }
+
         pid = fown->pid;
         if (!pid)
                 goto out_unlock_fown;
         
         read_lock(&tasklist_lock);
         do_each_pid_task(pid, type, p) {
-                send_sigio_to_task(p, fown, fd, band);
+                send_sigio_to_task(p, fown, fd, band, group);
         } while_each_pid_task(pid, type, p);
         read_unlock(&tasklist_lock);
  out_unlock_fown:
@@ -491,10 +576,10 @@ void send_sigio(struct fown_struct *fown, int fd, int band)
 }
 
 static void send_sigurg_to_task(struct task_struct *p,
-                                struct fown_struct *fown)
+                                struct fown_struct *fown, int group)
 {
         if (sigio_perm(p, fown, SIGURG))
-                group_send_sig_info(SIGURG, SEND_SIG_PRIV, p);
+                do_send_sig_info(SIGURG, SEND_SIG_PRIV, p, group);
 }
 
 int send_sigurg(struct fown_struct *fown)
@@ -502,10 +587,17 @@ int send_sigurg(struct fown_struct *fown)
         struct task_struct *p;
         enum pid_type type;
         struct pid *pid;
+        int group = 1;
         int ret = 0;
         
         read_lock(&fown->lock);
+
         type = fown->pid_type;
+        if (type == PIDTYPE_MAX) {
+                group = 0;
+                type = PIDTYPE_PID;
+        }
+
         pid = fown->pid;
         if (!pid)
                 goto out_unlock_fown;
@@ -514,7 +606,7 @@ int send_sigurg(struct fown_struct *fown)
         
         read_lock(&tasklist_lock);
         do_each_pid_task(pid, type, p) {
-                send_sigurg_to_task(p, fown);
+                send_sigurg_to_task(p, fown, group);
         } while_each_pid_task(pid, type, p);
         read_unlock(&tasklist_lock);
  out_unlock_fown:
diff --git a/fs/file_table.c b/fs/file_table.c
index 334ce39881f8..8eb44042e009 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -74,14 +74,14 @@ EXPORT_SYMBOL_GPL(get_max_files);
  * Handle nr_files sysctl
  */
 #if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS)
-int proc_nr_files(ctl_table *table, int write, struct file *filp,
+int proc_nr_files(ctl_table *table, int write,
                      void __user *buffer, size_t *lenp, loff_t *ppos)
 {
         files_stat.nr_files = get_nr_files();
-        return proc_dointvec(table, write, filp, buffer, lenp, ppos);
+        return proc_dointvec(table, write, buffer, lenp, ppos);
 }
 #else
-int proc_nr_files(ctl_table *table, int write, struct file *filp,
+int proc_nr_files(ctl_table *table, int write,
                      void __user *buffer, size_t *lenp, loff_t *ppos)
 {
         return -ENOSYS;
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 8e1e5e19d21e..9d5360c4c2af 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -41,8 +41,9 @@ struct wb_writeback_args {
         long nr_pages;
         struct super_block *sb;
         enum writeback_sync_modes sync_mode;
-        int for_kupdate;
-        int range_cyclic;
+        int for_kupdate:1;
+        int range_cyclic:1;
+        int for_background:1;
 };
 
 /*
@@ -249,14 +250,25 @@ static void bdi_sync_writeback(struct backing_dev_info *bdi,
  *   completion. Caller need not hold sb s_umount semaphore.
  *
  */
-void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages)
+void bdi_start_writeback(struct backing_dev_info *bdi, struct super_block *sb,
+                         long nr_pages)
 {
         struct wb_writeback_args args = {
+                .sb             = sb,
                 .sync_mode      = WB_SYNC_NONE,
                 .nr_pages       = nr_pages,
                 .range_cyclic   = 1,
         };
 
+        /*
+         * We treat @nr_pages=0 as the special case to do background writeback,
+         * ie. to sync pages until the background dirty threshold is reached.
+         */
+        if (!nr_pages) {
+                args.nr_pages = LONG_MAX;
+                args.for_background = 1;
+        }
+
         bdi_alloc_queue_work(bdi, &args);
 }
 
@@ -310,7 +322,7 @@ static bool inode_dirtied_after(struct inode *inode, unsigned long t)
          * For inodes being constantly redirtied, dirtied_when can get stuck.
          * It _appears_ to be in the future, but is actually in distant past.
          * This test is necessary to prevent such wrapped-around relative times
-         * from permanently stopping the whole pdflush writeback.
+         * from permanently stopping the whole bdi writeback.
          */
         ret = ret && time_before_eq(inode->dirtied_when, jiffies);
 #endif
@@ -324,13 +336,38 @@ static void move_expired_inodes(struct list_head *delaying_queue,
                                struct list_head *dispatch_queue,
                                 unsigned long *older_than_this)
 {
+        LIST_HEAD(tmp);
+        struct list_head *pos, *node;
+        struct super_block *sb = NULL;
+        struct inode *inode;
+        int do_sb_sort = 0;
+
         while (!list_empty(delaying_queue)) {
-                struct inode *inode = list_entry(delaying_queue->prev,
-                                                struct inode, i_list);
+                inode = list_entry(delaying_queue->prev, struct inode, i_list);
                 if (older_than_this &&
                     inode_dirtied_after(inode, *older_than_this))
                         break;
-                list_move(&inode->i_list, dispatch_queue);
+                if (sb && sb != inode->i_sb)
+                        do_sb_sort = 1;
+                sb = inode->i_sb;
+                list_move(&inode->i_list, &tmp);
+        }
+
+        /* just one sb in list, splice to dispatch_queue and we're done */
+        if (!do_sb_sort) {
+                list_splice(&tmp, dispatch_queue);
+                return;
+        }
+
+        /* Move inodes from one superblock together */
+        while (!list_empty(&tmp)) {
+                inode = list_entry(tmp.prev, struct inode, i_list);
+                sb = inode->i_sb;
+                list_for_each_prev_safe(pos, node, &tmp) {
+                        inode = list_entry(pos, struct inode, i_list);
+                        if (inode->i_sb == sb)
+                                list_move(&inode->i_list, dispatch_queue);
+                }
         }
 }
 
@@ -439,8 +476,18 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
         spin_lock(&inode_lock);
         inode->i_state &= ~I_SYNC;
         if (!(inode->i_state & (I_FREEING | I_CLEAR))) {
-                if (!(inode->i_state & I_DIRTY) &&
-                    mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
+                if ((inode->i_state & I_DIRTY_PAGES) && wbc->for_kupdate) {
+                        /*
+                         * More pages get dirtied by a fast dirtier.
+                         */
+                        goto select_queue;
+                } else if (inode->i_state & I_DIRTY) {
+                        /*
+                         * At least XFS will redirty the inode during the
+                         * writeback (delalloc) and on io completion (isize).
+                         */
+                        redirty_tail(inode);
+                } else if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
                         /*
                          * We didn't write back all the pages.  nfs_writepages()
                          * sometimes bales out without doing anything. Redirty
@@ -462,6 +509,7 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
                                  * soon as the queue becomes uncongested.
                                  */
                                 inode->i_state |= I_DIRTY_PAGES;
+select_queue:
                                 if (wbc->nr_to_write <= 0) {
                                         /*
                                          * slice used up: queue for next turn
@@ -484,12 +532,6 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
                                 inode->i_state |= I_DIRTY_PAGES;
                                 redirty_tail(inode);
                         }
-                } else if (inode->i_state & I_DIRTY) {
-                        /*
-                         * Someone redirtied the inode while were writing back
-                         * the pages.
-                         */
-                        redirty_tail(inode);
                 } else if (atomic_read(&inode->i_count)) {
                         /*
                          * The inode is clean, inuse
@@ -506,6 +548,17 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
         return ret;
 }
 
+static void unpin_sb_for_writeback(struct super_block **psb)
+{
+        struct super_block *sb = *psb;
+
+        if (sb) {
+                up_read(&sb->s_umount);
+                put_super(sb);
+                *psb = NULL;
+        }
+}
+
 /*
  * For WB_SYNC_NONE writeback, the caller does not have the sb pinned
  * before calling writeback. So make sure that we do pin it, so it doesn't
@@ -515,11 +568,20 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
  * 1 if we failed.
  */
 static int pin_sb_for_writeback(struct writeback_control *wbc,
-                                   struct inode *inode)
+                                struct inode *inode, struct super_block **psb)
 {
         struct super_block *sb = inode->i_sb;
 
         /*
+         * If this sb is already pinned, nothing more to do. If not and
+         * *psb is non-NULL, unpin the old one first
+         */
+        if (sb == *psb)
+                return 0;
+        else if (*psb)
+                unpin_sb_for_writeback(psb);
+
+        /*
          * Caller must already hold the ref for this
          */
         if (wbc->sync_mode == WB_SYNC_ALL) {
@@ -532,7 +594,7 @@ static int pin_sb_for_writeback(struct writeback_control *wbc,
         if (down_read_trylock(&sb->s_umount)) {
                 if (sb->s_root) {
                         spin_unlock(&sb_lock);
-                        return 0;
+                        goto pinned;
                 }
                 /*
                  * umounted, drop rwsem again and fall through to failure
@@ -543,24 +605,15 @@ static int pin_sb_for_writeback(struct writeback_control *wbc,
         sb->s_count--;
         spin_unlock(&sb_lock);
         return 1;
-}
-
-static void unpin_sb_for_writeback(struct writeback_control *wbc,
-                                   struct inode *inode)
-{
-        struct super_block *sb = inode->i_sb;
-
-        if (wbc->sync_mode == WB_SYNC_ALL)
-                return;
-
-        up_read(&sb->s_umount);
-        put_super(sb);
+pinned:
+        *psb = sb;
+        return 0;
 }
 
 static void writeback_inodes_wb(struct bdi_writeback *wb,
                                 struct writeback_control *wbc)
 {
-        struct super_block *sb = wbc->sb;
+        struct super_block *sb = wbc->sb, *pin_sb = NULL;
         const int is_blkdev_sb = sb_is_blkdev_sb(sb);
         const unsigned long start = jiffies;    /* livelock avoidance */
 
@@ -619,7 +672,7 @@ static void writeback_inodes_wb(struct bdi_writeback *wb,
                 if (inode_dirtied_after(inode, start))
                         break;
 
-                if (pin_sb_for_writeback(wbc, inode)) {
+                if (pin_sb_for_writeback(wbc, inode, &pin_sb)) {
                         requeue_io(inode);
                         continue;
                 }
@@ -628,7 +681,6 @@ static void writeback_inodes_wb(struct bdi_writeback *wb,
                 __iget(inode);
                 pages_skipped = wbc->pages_skipped;
                 writeback_single_inode(inode, wbc);
-                unpin_sb_for_writeback(wbc, inode);
                 if (wbc->pages_skipped != pages_skipped) {
                         /*
                          * writeback is not making progress due to locked
@@ -648,6 +700,8 @@ static void writeback_inodes_wb(struct bdi_writeback *wb,
                         wbc->more_io = 1;
         }
 
+        unpin_sb_for_writeback(&pin_sb);
+
         spin_unlock(&inode_lock);
         /* Leave any unwritten inodes on b_io */
 }
@@ -706,6 +760,7 @@ static long wb_writeback(struct bdi_writeback *wb,
         };
         unsigned long oldest_jif;
         long wrote = 0;
+        struct inode *inode;
 
         if (wbc.for_kupdate) {
                 wbc.older_than_this = &oldest_jif;
@@ -719,20 +774,16 @@ static long wb_writeback(struct bdi_writeback *wb,
 
         for (;;) {
                 /*
-                 * Don't flush anything for non-integrity writeback where
-                 * no nr_pages was given
+                 * Stop writeback when nr_pages has been consumed
                  */
-                if (!args->for_kupdate && args->nr_pages <= 0 &&
-                     args->sync_mode == WB_SYNC_NONE)
+                if (args->nr_pages <= 0)
                         break;
 
                 /*
-                 * If no specific pages were given and this is just a
-                 * periodic background writeout and we are below the
-                 * background dirty threshold, don't do anything
+                 * For background writeout, stop when we are below the
+                 * background dirty threshold
                  */
-                if (args->for_kupdate && args->nr_pages <= 0 &&
-                    !over_bground_thresh())
+                if (args->for_background && !over_bground_thresh())
                         break;
 
                 wbc.more_io = 0;
@@ -744,13 +795,32 @@ static long wb_writeback(struct bdi_writeback *wb,
                 wrote += MAX_WRITEBACK_PAGES - wbc.nr_to_write;
 
                 /*
-                 * If we ran out of stuff to write, bail unless more_io got set
+                 * If we consumed everything, see if we have more
                  */
-                if (wbc.nr_to_write > 0 || wbc.pages_skipped > 0) {
-                        if (wbc.more_io && !wbc.for_kupdate)
-                                continue;
+                if (wbc.nr_to_write <= 0)
+                        continue;
+                /*
+                 * Didn't write everything and we don't have more IO, bail
+                 */
+                if (!wbc.more_io)
                         break;
+                /*
+                 * Did we write something? Try for more
+                 */
+                if (wbc.nr_to_write < MAX_WRITEBACK_PAGES)
+                        continue;
+                /*
+                 * Nothing written. Wait for some inode to
+                 * become available for writeback. Otherwise
+                 * we'll just busyloop.
+                 */
+                spin_lock(&inode_lock);
+                if (!list_empty(&wb->b_more_io))  {
+                        inode = list_entry(wb->b_more_io.prev,
+                                                struct inode, i_list);
+                        inode_wait_for_writeback(inode);
                 }
+                spin_unlock(&inode_lock);
         }
 
         return wrote;
@@ -1060,9 +1130,6 @@ EXPORT_SYMBOL(__mark_inode_dirty);
  * If older_than_this is non-NULL, then only write out inodes which
  * had their first dirtying at a time earlier than *older_than_this.
  *
- * If we're a pdlfush thread, then implement pdflush collision avoidance
- * against the entire list.
- *
  * If `bdi' is non-zero then we're being asked to writeback a specific queue.
  * This function assumes that the blockdev superblock's inodes are backed by
  * a variety of queues, so all inodes are searched.  For other superblocks,
@@ -1141,7 +1208,7 @@ void writeback_inodes_sb(struct super_block *sb)
         nr_to_write = nr_dirty + nr_unstable +
                         (inodes_stat.nr_inodes - inodes_stat.nr_unused);
 
-        bdi_writeback_all(sb, nr_to_write);
+        bdi_start_writeback(sb->s_bdi, sb, nr_to_write);
 }
 EXPORT_SYMBOL(writeback_inodes_sb);
 
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index e703654e7f40..992f6c9410bb 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1276,14 +1276,9 @@ static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
                 return 0;
 
         if (attr->ia_valid & ATTR_SIZE) {
-                unsigned long limit;
-                if (IS_SWAPFILE(inode))
-                        return -ETXTBSY;
-                limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
-                if (limit != RLIM_INFINITY && attr->ia_size > (loff_t) limit) {
-                        send_sig(SIGXFSZ, current, 0);
-                        return -EFBIG;
-                }
+                err = inode_newsize_ok(inode, attr->ia_size);
+                if (err)
+                        return err;
                 is_truncate = true;
         }
 
@@ -1350,8 +1345,7 @@ static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
          * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
          */
         if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
-                if (outarg.attr.size < oldsize)
-                        fuse_truncate(inode->i_mapping, outarg.attr.size);
+                truncate_pagecache(inode, oldsize, outarg.attr.size);
                 invalidate_inode_pages2(inode->i_mapping);
         }
 
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index cbc464043b6f..a3492f7d207c 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1313,7 +1313,7 @@ static int fuse_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
         return 0;
 }
 
-static struct vm_operations_struct fuse_file_vm_ops = {
+static const struct vm_operations_struct fuse_file_vm_ops = {
         .close          = fuse_vma_close,
         .fault          = filemap_fault,
         .page_mkwrite   = fuse_page_mkwrite,
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index fc9c79feb5f7..01cc462ff45d 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -606,8 +606,6 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
 void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
                                    u64 attr_valid);
 
-void fuse_truncate(struct address_space *mapping, loff_t offset);
-
 /**
  * Initialize the client device
  */
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 6da947daabda..1a822ce2b24b 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -140,14 +140,6 @@ static int fuse_remount_fs(struct super_block *sb, int *flags, char *data)
         return 0;
 }
 
-void fuse_truncate(struct address_space *mapping, loff_t offset)
-{
-        /* See vmtruncate() */
-        unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
-        truncate_inode_pages(mapping, offset);
-        unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
-}
-
 void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
                                    u64 attr_valid)
 {
@@ -205,8 +197,7 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
         spin_unlock(&fc->lock);
 
         if (S_ISREG(inode->i_mode) && oldsize != attr->size) {
-                if (attr->size < oldsize)
-                        fuse_truncate(inode->i_mapping, attr->size);
+                truncate_pagecache(inode, oldsize, attr->size);
                 invalidate_inode_pages2(inode->i_mapping);
         }
 }
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index 7ebae9a4ecc0..694b5d48f036 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -1135,6 +1135,7 @@ static const struct address_space_operations gfs2_writeback_aops = {
         .direct_IO = gfs2_direct_IO,
         .migratepage = buffer_migrate_page,
         .is_partially_uptodate = block_is_partially_uptodate,
+        .error_remove_page = generic_error_remove_page,
 };
 
 static const struct address_space_operations gfs2_ordered_aops = {
@@ -1151,6 +1152,7 @@ static const struct address_space_operations gfs2_ordered_aops = {
         .direct_IO = gfs2_direct_IO,
         .migratepage = buffer_migrate_page,
         .is_partially_uptodate = block_is_partially_uptodate,
+        .error_remove_page = generic_error_remove_page,
 };
 
 static const struct address_space_operations gfs2_jdata_aops = {
@@ -1166,6 +1168,7 @@ static const struct address_space_operations gfs2_jdata_aops = {
         .invalidatepage = gfs2_invalidatepage,
         .releasepage = gfs2_releasepage,
         .is_partially_uptodate = block_is_partially_uptodate,
+        .error_remove_page = generic_error_remove_page,
 };
 
 void gfs2_set_aops(struct inode *inode)
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 166f38fbd246..4eb308aa3234 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -418,7 +418,7 @@ out:
         return ret;
 }
 
-static struct vm_operations_struct gfs2_vm_ops = {
+static const struct vm_operations_struct gfs2_vm_ops = {
         .fault = filemap_fault,
         .page_mkwrite = gfs2_page_mkwrite,
 };
diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
index c3ac18054057..247436c10deb 100644
--- a/fs/gfs2/ops_inode.c
+++ b/fs/gfs2/ops_inode.c
@@ -12,7 +12,6 @@
 #include <linux/completion.h>
 #include <linux/buffer_head.h>
 #include <linux/namei.h>
-#include <linux/utsname.h>
 #include <linux/mm.h>
 #include <linux/xattr.h>
 #include <linux/posix_acl.h>
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 28c590b7c9da..8f1cfb02a6cb 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -179,7 +179,7 @@ static inline u64 gfs2_bit_search(const __le64 *ptr, u64 mask, u8 state)
  * always aligned to a 64 bit boundary.
  *
  * The size of the buffer is in bytes, but is it assumed that it is
- * always ok to to read a complete multiple of 64 bits at the end
+ * always ok to read a complete multiple of 64 bits at the end
  * of the block in case the end is no aligned to a natural boundary.
  *
  * Return: the block number (bitmap buffer scope) that was found
diff --git a/fs/hfs/mdb.c b/fs/hfs/mdb.c
index 7b6165f25fbe..8bbe03c3f6d5 100644
--- a/fs/hfs/mdb.c
+++ b/fs/hfs/mdb.c
@@ -344,10 +344,8 @@ void hfs_mdb_put(struct super_block *sb)
         brelse(HFS_SB(sb)->mdb_bh);
         brelse(HFS_SB(sb)->alt_mdb_bh);
 
-        if (HFS_SB(sb)->nls_io)
-                unload_nls(HFS_SB(sb)->nls_io);
-        if (HFS_SB(sb)->nls_disk)
-                unload_nls(HFS_SB(sb)->nls_disk);
+        unload_nls(HFS_SB(sb)->nls_io);
+        unload_nls(HFS_SB(sb)->nls_disk);
 
         free_pages((unsigned long)HFS_SB(sb)->bitmap, PAGE_SIZE < 8192 ? 1 : 0);
         kfree(HFS_SB(sb));
diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index c0759fe0855b..43022f3d5148 100644
--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -229,8 +229,7 @@ static void hfsplus_put_super(struct super_block *sb)
         iput(HFSPLUS_SB(sb).alloc_file);
         iput(HFSPLUS_SB(sb).hidden_dir);
         brelse(HFSPLUS_SB(sb).s_vhbh);
-        if (HFSPLUS_SB(sb).nls)
-                unload_nls(HFSPLUS_SB(sb).nls);
+        unload_nls(HFSPLUS_SB(sb).nls);
         kfree(sb->s_fs_info);
         sb->s_fs_info = NULL;
 
@@ -464,8 +463,7 @@ out:
 
 cleanup:
         hfsplus_put_super(sb);
-        if (nls)
-                unload_nls(nls);
+        unload_nls(nls);
         return err;
 }
 
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index a93b885311d8..87a1258953b8 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -31,12 +31,10 @@
 #include <linux/statfs.h>
 #include <linux/security.h>
 #include <linux/ima.h>
+#include <linux/magic.h>
 
 #include <asm/uaccess.h>
 
-/* some random number */
-#define HUGETLBFS_MAGIC 0x958458f6
-
 static const struct super_operations hugetlbfs_ops;
 static const struct address_space_operations hugetlbfs_aops;
 const struct file_operations hugetlbfs_file_operations;
@@ -382,36 +380,11 @@ static void hugetlbfs_delete_inode(struct inode *inode)
 
 static void hugetlbfs_forget_inode(struct inode *inode) __releases(inode_lock)
 {
-        struct super_block *sb = inode->i_sb;
-
-        if (!hlist_unhashed(&inode->i_hash)) {
-                if (!(inode->i_state & (I_DIRTY|I_SYNC)))
-                        list_move(&inode->i_list, &inode_unused);
-                inodes_stat.nr_unused++;
-                if (!sb || (sb->s_flags & MS_ACTIVE)) {
-                        spin_unlock(&inode_lock);
-                        return;
-                }
-                inode->i_state |= I_WILL_FREE;
-                spin_unlock(&inode_lock);
-                /*
-                 * write_inode_now is a noop as we set BDI_CAP_NO_WRITEBACK
-                 * in our backing_dev_info.
-                 */
-                write_inode_now(inode, 1);
-                spin_lock(&inode_lock);
-                inode->i_state &= ~I_WILL_FREE;
-                inodes_stat.nr_unused--;
-                hlist_del_init(&inode->i_hash);
+        if (generic_detach_inode(inode)) {
+                truncate_hugepages(inode, 0);
+                clear_inode(inode);
+                destroy_inode(inode);
         }
-        list_del_init(&inode->i_list);
-        list_del_init(&inode->i_sb_list);
-        inode->i_state |= I_FREEING;
-        inodes_stat.nr_inodes--;
-        spin_unlock(&inode_lock);
-        truncate_hugepages(inode, 0);
-        clear_inode(inode);
-        destroy_inode(inode);
 }
 
 static void hugetlbfs_drop_inode(struct inode *inode)
@@ -507,6 +480,13 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb, uid_t uid,
                 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
                 INIT_LIST_HEAD(&inode->i_mapping->private_list);
                 info = HUGETLBFS_I(inode);
+                /*
+                 * The policy is initialized here even if we are creating a
+                 * private inode because initialization simply creates an
+                 * an empty rb tree and calls spin_lock_init(), later when we
+                 * call mpol_free_shared_policy() it will just return because
+                 * the rb tree will still be empty.
+                 */
                 mpol_shared_policy_init(&info->policy, NULL);
                 switch (mode & S_IFMT) {
                 default:
@@ -937,7 +917,7 @@ static int can_do_hugetlb_shm(void)
 }
 
 struct file *hugetlb_file_setup(const char *name, size_t size, int acctflag,
-                                                struct user_struct **user)
+                                struct user_struct **user, int creat_flags)
 {
         int error = -ENOMEM;
         struct file *file;
@@ -949,7 +929,7 @@ struct file *hugetlb_file_setup(const char *name, size_t size, int acctflag,
         if (!hugetlbfs_vfsmount)
                 return ERR_PTR(-ENOENT);
 
-        if (!can_do_hugetlb_shm()) {
+        if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) {
                 *user = current_user();
                 if (user_shm_lock(size, *user)) {
                         WARN_ONCE(1,
diff --git a/fs/inode.c b/fs/inode.c
index b2ba83d2c4e1..4d8e3be55976 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -14,6 +14,7 @@
 #include <linux/module.h>
 #include <linux/backing-dev.h>
 #include <linux/wait.h>
+#include <linux/rwsem.h>
 #include <linux/hash.h>
 #include <linux/swap.h>
 #include <linux/security.h>
@@ -87,14 +88,18 @@ static struct hlist_head *inode_hashtable __read_mostly;
 DEFINE_SPINLOCK(inode_lock);
 
 /*
- * iprune_mutex provides exclusion between the kswapd or try_to_free_pages
+ * iprune_sem provides exclusion between the kswapd or try_to_free_pages
  * icache shrinking path, and the umount path.  Without this exclusion,
  * by the time prune_icache calls iput for the inode whose pages it has
  * been invalidating, or by the time it calls clear_inode & destroy_inode
  * from its final dispose_list, the struct super_block they refer to
  * (for inode->i_sb->s_op) may already have been freed and reused.
+ *
+ * We make this an rwsem because the fastpath is icache shrinking. In
+ * some cases a filesystem may be doing a significant amount of work in
+ * its inode reclaim code, so this should improve parallelism.
  */
-static DEFINE_MUTEX(iprune_mutex);
+static DECLARE_RWSEM(iprune_sem);
 
 /*
  * Statistics gathering..
@@ -123,7 +128,7 @@ static void wake_up_inode(struct inode *inode)
 int inode_init_always(struct super_block *sb, struct inode *inode)
 {
         static const struct address_space_operations empty_aops;
-        static struct inode_operations empty_iops;
+        static const struct inode_operations empty_iops;
         static const struct file_operations empty_fops;
         struct address_space *const mapping = &inode->i_data;
 
@@ -381,7 +386,7 @@ static int invalidate_list(struct list_head *head, struct list_head *dispose)
                 /*
                  * We can reschedule here without worrying about the list's
                  * consistency because the per-sb list of inodes must not
-                 * change during umount anymore, and because iprune_mutex keeps
+                 * change during umount anymore, and because iprune_sem keeps
                  * shrink_icache_memory() away.
                  */
                 cond_resched_lock(&inode_lock);
@@ -420,7 +425,7 @@ int invalidate_inodes(struct super_block *sb)
         int busy;
         LIST_HEAD(throw_away);
 
-        mutex_lock(&iprune_mutex);
+        down_write(&iprune_sem);
         spin_lock(&inode_lock);
         inotify_unmount_inodes(&sb->s_inodes);
         fsnotify_unmount_inodes(&sb->s_inodes);
@@ -428,7 +433,7 @@ int invalidate_inodes(struct super_block *sb)
         spin_unlock(&inode_lock);
 
         dispose_list(&throw_away);
-        mutex_unlock(&iprune_mutex);
+        up_write(&iprune_sem);
 
         return busy;
 }
@@ -467,7 +472,7 @@ static void prune_icache(int nr_to_scan)
         int nr_scanned;
         unsigned long reap = 0;
 
-        mutex_lock(&iprune_mutex);
+        down_read(&iprune_sem);
         spin_lock(&inode_lock);
         for (nr_scanned = 0; nr_scanned < nr_to_scan; nr_scanned++) {
                 struct inode *inode;
@@ -509,7 +514,7 @@ static void prune_icache(int nr_to_scan)
         spin_unlock(&inode_lock);
 
         dispose_list(&freeable);
-        mutex_unlock(&iprune_mutex);
+        up_read(&iprune_sem);
 }
 
 /*
@@ -695,13 +700,15 @@ void unlock_new_inode(struct inode *inode)
         }
 #endif
         /*
-         * This is special!  We do not need the spinlock
-         * when clearing I_LOCK, because we're guaranteed
-         * that nobody else tries to do anything about the
-         * state of the inode when it is locked, as we
-         * just created it (so there can be no old holders
-         * that haven't tested I_LOCK).
+         * This is special!  We do not need the spinlock when clearing I_LOCK,
+         * because we're guaranteed that nobody else tries to do anything about
+         * the state of the inode when it is locked, as we just created it (so
+         * there can be no old holders that haven't tested I_LOCK).
+         * However we must emit the memory barrier so that other CPUs reliably
+         * see the clearing of I_LOCK after the other inode initialisation has
+         * completed.
          */
+        smp_mb();
         WARN_ON((inode->i_state & (I_LOCK|I_NEW)) != (I_LOCK|I_NEW));
         inode->i_state &= ~(I_LOCK|I_NEW);
         wake_up_inode(inode);
@@ -1234,7 +1241,16 @@ void generic_delete_inode(struct inode *inode)
 }
 EXPORT_SYMBOL(generic_delete_inode);
 
-static void generic_forget_inode(struct inode *inode)
+/**
+ *      generic_detach_inode - remove inode from inode lists
+ *      @inode: inode to remove
+ *
+ *      Remove inode from inode lists, write it if it's dirty. This is just an
+ *      internal VFS helper exported for hugetlbfs. Do not use!
+ *
+ *      Returns 1 if inode should be completely destroyed.
+ */
+int generic_detach_inode(struct inode *inode)
 {
         struct super_block *sb = inode->i_sb;
 
@@ -1244,7 +1260,7 @@ static void generic_forget_inode(struct inode *inode)
                 inodes_stat.nr_unused++;
                 if (sb->s_flags & MS_ACTIVE) {
                         spin_unlock(&inode_lock);
-                        return;
+                        return 0;
                 }
                 WARN_ON(inode->i_state & I_NEW);
                 inode->i_state |= I_WILL_FREE;
@@ -1262,6 +1278,14 @@ static void generic_forget_inode(struct inode *inode)
         inode->i_state |= I_FREEING;
         inodes_stat.nr_inodes--;
         spin_unlock(&inode_lock);
+        return 1;
+}
+EXPORT_SYMBOL_GPL(generic_detach_inode);
+
+static void generic_forget_inode(struct inode *inode)
+{
+        if (!generic_detach_inode(inode))
+                return;
         if (inode->i_data.nrpages)
                 truncate_inode_pages(&inode->i_data, 0);
         clear_inode(inode);
@@ -1392,31 +1416,31 @@ void touch_atime(struct vfsmount *mnt, struct dentry *dentry)
         struct inode *inode = dentry->d_inode;
         struct timespec now;
 
-        if (mnt_want_write(mnt))
-                return;
         if (inode->i_flags & S_NOATIME)
-                goto out;
+                return;
         if (IS_NOATIME(inode))
-                goto out;
+                return;
         if ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode))
-                goto out;
+                return;
 
         if (mnt->mnt_flags & MNT_NOATIME)
-                goto out;
+                return;
         if ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))
-                goto out;
+                return;
 
         now = current_fs_time(inode->i_sb);
 
         if (!relatime_need_update(mnt, inode, now))
-                goto out;
+                return;
 
         if (timespec_equal(&inode->i_atime, &now))
-                goto out;
+                return;
+
+        if (mnt_want_write(mnt))
+                return;
 
         inode->i_atime = now;
         mark_inode_dirty_sync(inode);
-out:
         mnt_drop_write(mnt);
 }
 EXPORT_SYMBOL(touch_atime);
@@ -1437,34 +1461,37 @@ void file_update_time(struct file *file)
 {
         struct inode *inode = file->f_path.dentry->d_inode;
         struct timespec now;
-        int sync_it = 0;
-        int err;
+        enum { S_MTIME = 1, S_CTIME = 2, S_VERSION = 4 } sync_it = 0;
 
+        /* First try to exhaust all avenues to not sync */
         if (IS_NOCMTIME(inode))
                 return;
 
-        err = mnt_want_write_file(file);
-        if (err)
-                return;
-
         now = current_fs_time(inode->i_sb);
-        if (!timespec_equal(&inode->i_mtime, &now)) {
-                inode->i_mtime = now;
-                sync_it = 1;
-        }
+        if (!timespec_equal(&inode->i_mtime, &now))
+                sync_it = S_MTIME;
 
-        if (!timespec_equal(&inode->i_ctime, &now)) {
-                inode->i_ctime = now;
-                sync_it = 1;
-        }
+        if (!timespec_equal(&inode->i_ctime, &now))
+                sync_it |= S_CTIME;
 
-        if (IS_I_VERSION(inode)) {
-                inode_inc_iversion(inode);
-                sync_it = 1;
-        }
+        if (IS_I_VERSION(inode))
+                sync_it |= S_VERSION;
+
+        if (!sync_it)
+                return;
 
-        if (sync_it)
-                mark_inode_dirty_sync(inode);
+        /* Finally allowed to write? Takes lock. */
+        if (mnt_want_write_file(file))
+                return;
+
+        /* Only change inode inside the lock region */
+        if (sync_it & S_VERSION)
+                inode_inc_iversion(inode);
+        if (sync_it & S_CTIME)
+                inode->i_ctime = now;
+        if (sync_it & S_MTIME)
+                inode->i_mtime = now;
+        mark_inode_dirty_sync(inode);
         mnt_drop_write(file->f_path.mnt);
 }
 EXPORT_SYMBOL(file_update_time);
@@ -1592,7 +1619,8 @@ void init_special_inode(struct inode *inode, umode_t mode, dev_t rdev)
         else if (S_ISSOCK(mode))
                 inode->i_fop = &bad_sock_fops;
         else
-                printk(KERN_DEBUG "init_special_inode: bogus i_mode (%o)\n",
-                       mode);
+                printk(KERN_DEBUG "init_special_inode: bogus i_mode (%o) for"
+                                  " inode %s:%lu\n", mode, inode->i_sb->s_id,
+                                  inode->i_ino);
 }
 EXPORT_SYMBOL(init_special_inode);
diff --git a/fs/internal.h b/fs/internal.h
index d55ef562f0bb..515175b8b72e 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -57,6 +57,7 @@ extern int check_unsafe_exec(struct linux_binprm *);
  * namespace.c
  */
 extern int copy_mount_options(const void __user *, unsigned long *);
+extern int copy_mount_string(const void __user *, char **);
 
 extern void free_vfsmnt(struct vfsmount *);
 extern struct vfsmount *alloc_vfsmnt(const char *);
diff --git a/fs/ioctl.c b/fs/ioctl.c
index 5612880fcbe7..7b17a14396ff 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -162,20 +162,21 @@ EXPORT_SYMBOL(fiemap_check_flags);
 static int fiemap_check_ranges(struct super_block *sb,
                                u64 start, u64 len, u64 *new_len)
 {
+        u64 maxbytes = (u64) sb->s_maxbytes;
+
         *new_len = len;
 
         if (len == 0)
                 return -EINVAL;
 
-        if (start > sb->s_maxbytes)
+        if (start > maxbytes)
                 return -EFBIG;
 
         /*
          * Shrink request scope to what the fs can actually handle.
          */
-        if ((len > sb->s_maxbytes) ||
-            (sb->s_maxbytes - len) < start)
-                *new_len = sb->s_maxbytes - start;
+        if (len > maxbytes || (maxbytes - len) < start)
+                *new_len = maxbytes - start;
 
         return 0;
 }
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index 85f96bc651c7..6b4dcd4f2943 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -46,10 +46,7 @@ static void isofs_put_super(struct super_block *sb)
 #ifdef CONFIG_JOLIET
         lock_kernel();
 
-        if (sbi->s_nls_iocharset) {
-                unload_nls(sbi->s_nls_iocharset);
-                sbi->s_nls_iocharset = NULL;
-        }
+        unload_nls(sbi->s_nls_iocharset);
 
         unlock_kernel();
 #endif
@@ -912,8 +909,7 @@ out_no_root:
                 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
 out_no_inode:
 #ifdef CONFIG_JOLIET
-        if (sbi->s_nls_iocharset)
-                unload_nls(sbi->s_nls_iocharset);
+        unload_nls(sbi->s_nls_iocharset);
 #endif
         goto out_freesbi;
 out_no_read:
diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c
index 5d70b3e6d49b..ca0f5eb62b20 100644
--- a/fs/jbd2/checkpoint.c
+++ b/fs/jbd2/checkpoint.c
@@ -643,6 +643,7 @@ out:
 
 int __jbd2_journal_remove_checkpoint(struct journal_head *jh)
 {
+        struct transaction_chp_stats_s *stats;
         transaction_t *transaction;
         journal_t *journal;
         int ret = 0;
@@ -679,6 +680,12 @@ int __jbd2_journal_remove_checkpoint(struct journal_head *jh)
 
         /* OK, that was the last buffer for the transaction: we can now
            safely remove this transaction from the log */
+        stats = &transaction->t_chp_stats;
+        if (stats->cs_chp_time)
+                stats->cs_chp_time = jbd2_time_diff(stats->cs_chp_time,
+                                                    jiffies);
+        trace_jbd2_checkpoint_stats(journal->j_fs_dev->bd_dev,
+                                    transaction->t_tid, stats);
 
         __jbd2_journal_drop_transaction(journal, transaction);
         kfree(transaction);
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 26d991ddc1e6..d4cfd6d2779e 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -410,10 +410,10 @@ void jbd2_journal_commit_transaction(journal_t *journal)
         if (commit_transaction->t_synchronous_commit)
                 write_op = WRITE_SYNC_PLUG;
         trace_jbd2_commit_locking(journal, commit_transaction);
-        stats.u.run.rs_wait = commit_transaction->t_max_wait;
-        stats.u.run.rs_locked = jiffies;
-        stats.u.run.rs_running = jbd2_time_diff(commit_transaction->t_start,
-                                                stats.u.run.rs_locked);
+        stats.run.rs_wait = commit_transaction->t_max_wait;
+        stats.run.rs_locked = jiffies;
+        stats.run.rs_running = jbd2_time_diff(commit_transaction->t_start,
+                                              stats.run.rs_locked);
 
         spin_lock(&commit_transaction->t_handle_lock);
         while (commit_transaction->t_updates) {
@@ -486,9 +486,9 @@ void jbd2_journal_commit_transaction(journal_t *journal)
         jbd2_journal_switch_revoke_table(journal);
 
         trace_jbd2_commit_flushing(journal, commit_transaction);
-        stats.u.run.rs_flushing = jiffies;
-        stats.u.run.rs_locked = jbd2_time_diff(stats.u.run.rs_locked,
-                                               stats.u.run.rs_flushing);
+        stats.run.rs_flushing = jiffies;
+        stats.run.rs_locked = jbd2_time_diff(stats.run.rs_locked,
+                                             stats.run.rs_flushing);
 
         commit_transaction->t_state = T_FLUSH;
         journal->j_committing_transaction = commit_transaction;
@@ -523,11 +523,11 @@ void jbd2_journal_commit_transaction(journal_t *journal)
         spin_unlock(&journal->j_state_lock);
 
         trace_jbd2_commit_logging(journal, commit_transaction);
-        stats.u.run.rs_logging = jiffies;
-        stats.u.run.rs_flushing = jbd2_time_diff(stats.u.run.rs_flushing,
-                                                 stats.u.run.rs_logging);
-        stats.u.run.rs_blocks = commit_transaction->t_outstanding_credits;
-        stats.u.run.rs_blocks_logged = 0;
+        stats.run.rs_logging = jiffies;
+        stats.run.rs_flushing = jbd2_time_diff(stats.run.rs_flushing,
+                                               stats.run.rs_logging);
+        stats.run.rs_blocks = commit_transaction->t_outstanding_credits;
+        stats.run.rs_blocks_logged = 0;
 
         J_ASSERT(commit_transaction->t_nr_buffers <=
                  commit_transaction->t_outstanding_credits);
@@ -695,7 +695,7 @@ start_journal_io:
                                 submit_bh(write_op, bh);
                         }
                         cond_resched();
-                        stats.u.run.rs_blocks_logged += bufs;
+                        stats.run.rs_blocks_logged += bufs;
 
                         /* Force a new descriptor to be generated next
                            time round the loop. */
@@ -988,33 +988,30 @@ restart_loop:
         J_ASSERT(commit_transaction->t_state == T_COMMIT);
 
         commit_transaction->t_start = jiffies;
-        stats.u.run.rs_logging = jbd2_time_diff(stats.u.run.rs_logging,
-                                                commit_transaction->t_start);
+        stats.run.rs_logging = jbd2_time_diff(stats.run.rs_logging,
+                                              commit_transaction->t_start);
 
         /*
-         * File the transaction for history
+         * File the transaction statistics
          */
-        stats.ts_type = JBD2_STATS_RUN;
         stats.ts_tid = commit_transaction->t_tid;
-        stats.u.run.rs_handle_count = commit_transaction->t_handle_count;
-        spin_lock(&journal->j_history_lock);
-        memcpy(journal->j_history + journal->j_history_cur, &stats,
-                        sizeof(stats));
-        if (++journal->j_history_cur == journal->j_history_max)
-                journal->j_history_cur = 0;
+        stats.run.rs_handle_count = commit_transaction->t_handle_count;
+        trace_jbd2_run_stats(journal->j_fs_dev->bd_dev,
+                             commit_transaction->t_tid, &stats.run);
 
         /*
          * Calculate overall stats
          */
+        spin_lock(&journal->j_history_lock);
         journal->j_stats.ts_tid++;
-        journal->j_stats.u.run.rs_wait += stats.u.run.rs_wait;
-        journal->j_stats.u.run.rs_running += stats.u.run.rs_running;
-        journal->j_stats.u.run.rs_locked += stats.u.run.rs_locked;
-        journal->j_stats.u.run.rs_flushing += stats.u.run.rs_flushing;
-        journal->j_stats.u.run.rs_logging += stats.u.run.rs_logging;
-        journal->j_stats.u.run.rs_handle_count += stats.u.run.rs_handle_count;
-        journal->j_stats.u.run.rs_blocks += stats.u.run.rs_blocks;
-        journal->j_stats.u.run.rs_blocks_logged += stats.u.run.rs_blocks_logged;
+        journal->j_stats.run.rs_wait += stats.run.rs_wait;
+        journal->j_stats.run.rs_running += stats.run.rs_running;
+        journal->j_stats.run.rs_locked += stats.run.rs_locked;
+        journal->j_stats.run.rs_flushing += stats.run.rs_flushing;
+        journal->j_stats.run.rs_logging += stats.run.rs_logging;
+        journal->j_stats.run.rs_handle_count += stats.run.rs_handle_count;
+        journal->j_stats.run.rs_blocks += stats.run.rs_blocks;
+        journal->j_stats.run.rs_blocks_logged += stats.run.rs_blocks_logged;
         spin_unlock(&journal->j_history_lock);
 
         commit_transaction->t_state = T_FINISHED;
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index a8a358bc0f21..b0ab5219becb 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -136,10 +136,6 @@ static int kjournald2(void *arg)
         journal->j_task = current;
         wake_up(&journal->j_wait_done_commit);
 
-        printk(KERN_INFO "kjournald2 starting: pid %d, dev %s, "
-               "commit interval %ld seconds\n", current->pid,
-               journal->j_devname, journal->j_commit_interval / HZ);
-
         /*
          * And now, wait forever for commit wakeup events.
          */
@@ -223,7 +219,8 @@ static int jbd2_journal_start_thread(journal_t *journal)
 {
         struct task_struct *t;
 
-        t = kthread_run(kjournald2, journal, "kjournald2");
+        t = kthread_run(kjournald2, journal, "jbd2/%s",
+                        journal->j_devname);
         if (IS_ERR(t))
                 return PTR_ERR(t);
 
@@ -679,153 +676,6 @@ struct jbd2_stats_proc_session {
         int max;
 };
 
-static void *jbd2_history_skip_empty(struct jbd2_stats_proc_session *s,
-                                        struct transaction_stats_s *ts,
-                                        int first)
-{
-        if (ts == s->stats + s->max)
-                ts = s->stats;
-        if (!first && ts == s->stats + s->start)
-                return NULL;
-        while (ts->ts_type == 0) {
-                ts++;
-                if (ts == s->stats + s->max)
-                        ts = s->stats;
-                if (ts == s->stats + s->start)
-                        return NULL;
-        }
-        return ts;
-
-}
-
-static void *jbd2_seq_history_start(struct seq_file *seq, loff_t *pos)
-{
-        struct jbd2_stats_proc_session *s = seq->private;
-        struct transaction_stats_s *ts;
-        int l = *pos;
-
-        if (l == 0)
-                return SEQ_START_TOKEN;
-        ts = jbd2_history_skip_empty(s, s->stats + s->start, 1);
-        if (!ts)
-                return NULL;
-        l--;
-        while (l) {
-                ts = jbd2_history_skip_empty(s, ++ts, 0);
-                if (!ts)
-                        break;
-                l--;
-        }
-        return ts;
-}
-
-static void *jbd2_seq_history_next(struct seq_file *seq, void *v, loff_t *pos)
-{
-        struct jbd2_stats_proc_session *s = seq->private;
-        struct transaction_stats_s *ts = v;
-
-        ++*pos;
-        if (v == SEQ_START_TOKEN)
-                return jbd2_history_skip_empty(s, s->stats + s->start, 1);
-        else
-                return jbd2_history_skip_empty(s, ++ts, 0);
-}
-
-static int jbd2_seq_history_show(struct seq_file *seq, void *v)
-{
-        struct transaction_stats_s *ts = v;
-        if (v == SEQ_START_TOKEN) {
-                seq_printf(seq, "%-4s %-5s %-5s %-5s %-5s %-5s %-5s %-6s %-5s "
-                                "%-5s %-5s %-5s %-5s %-5s\n", "R/C", "tid",
-                                "wait", "run", "lock", "flush", "log", "hndls",
-                                "block", "inlog", "ctime", "write", "drop",
-                                "close");
-                return 0;
-        }
-        if (ts->ts_type == JBD2_STATS_RUN)
-                seq_printf(seq, "%-4s %-5lu %-5u %-5u %-5u %-5u %-5u "
-                                "%-6lu %-5lu %-5lu\n", "R", ts->ts_tid,
-                                jiffies_to_msecs(ts->u.run.rs_wait),
-                                jiffies_to_msecs(ts->u.run.rs_running),
-                                jiffies_to_msecs(ts->u.run.rs_locked),
-                                jiffies_to_msecs(ts->u.run.rs_flushing),
-                                jiffies_to_msecs(ts->u.run.rs_logging),
-                                ts->u.run.rs_handle_count,
-                                ts->u.run.rs_blocks,
-                                ts->u.run.rs_blocks_logged);
-        else if (ts->ts_type == JBD2_STATS_CHECKPOINT)
-                seq_printf(seq, "%-4s %-5lu %48s %-5u %-5lu %-5lu %-5lu\n",
-                                "C", ts->ts_tid, " ",
-                                jiffies_to_msecs(ts->u.chp.cs_chp_time),
-                                ts->u.chp.cs_written, ts->u.chp.cs_dropped,
-                                ts->u.chp.cs_forced_to_close);
-        else
-                J_ASSERT(0);
-        return 0;
-}
-
-static void jbd2_seq_history_stop(struct seq_file *seq, void *v)
-{
-}
-
-static struct seq_operations jbd2_seq_history_ops = {
-        .start  = jbd2_seq_history_start,
-        .next   = jbd2_seq_history_next,
-        .stop   = jbd2_seq_history_stop,
-        .show   = jbd2_seq_history_show,
-};
-
-static int jbd2_seq_history_open(struct inode *inode, struct file *file)
-{
-        journal_t *journal = PDE(inode)->data;
-        struct jbd2_stats_proc_session *s;
-        int rc, size;
-
-        s = kmalloc(sizeof(*s), GFP_KERNEL);
-        if (s == NULL)
-                return -ENOMEM;
-        size = sizeof(struct transaction_stats_s) * journal->j_history_max;
-        s->stats = kmalloc(size, GFP_KERNEL);
-        if (s->stats == NULL) {
-                kfree(s);
-                return -ENOMEM;
-        }
-        spin_lock(&journal->j_history_lock);
-        memcpy(s->stats, journal->j_history, size);
-        s->max = journal->j_history_max;
-        s->start = journal->j_history_cur % s->max;
-        spin_unlock(&journal->j_history_lock);
-
-        rc = seq_open(file, &jbd2_seq_history_ops);
-        if (rc == 0) {
-                struct seq_file *m = file->private_data;
-                m->private = s;
-        } else {
-                kfree(s->stats);
-                kfree(s);
-        }
-        return rc;
-
-}
-
-static int jbd2_seq_history_release(struct inode *inode, struct file *file)
-{
-        struct seq_file *seq = file->private_data;
-        struct jbd2_stats_proc_session *s = seq->private;
-
-        kfree(s->stats);
-        kfree(s);
-        return seq_release(inode, file);
-}
-
-static struct file_operations jbd2_seq_history_fops = {
-        .owner          = THIS_MODULE,
-        .open           = jbd2_seq_history_open,
-        .read           = seq_read,
-        .llseek         = seq_lseek,
-        .release        = jbd2_seq_history_release,
-};
-
 static void *jbd2_seq_info_start(struct seq_file *seq, loff_t *pos)
 {
         return *pos ? NULL : SEQ_START_TOKEN;
@@ -842,29 +692,29 @@ static int jbd2_seq_info_show(struct seq_file *seq, void *v)
 
         if (v != SEQ_START_TOKEN)
                 return 0;
-        seq_printf(seq, "%lu transaction, each upto %u blocks\n",
+        seq_printf(seq, "%lu transaction, each up to %u blocks\n",
                         s->stats->ts_tid,
                         s->journal->j_max_transaction_buffers);
         if (s->stats->ts_tid == 0)
                 return 0;
         seq_printf(seq, "average: \n  %ums waiting for transaction\n",
-            jiffies_to_msecs(s->stats->u.run.rs_wait / s->stats->ts_tid));
+            jiffies_to_msecs(s->stats->run.rs_wait / s->stats->ts_tid));
         seq_printf(seq, "  %ums running transaction\n",
-            jiffies_to_msecs(s->stats->u.run.rs_running / s->stats->ts_tid));
+            jiffies_to_msecs(s->stats->run.rs_running / s->stats->ts_tid));
         seq_printf(seq, "  %ums transaction was being locked\n",
-            jiffies_to_msecs(s->stats->u.run.rs_locked / s->stats->ts_tid));
+            jiffies_to_msecs(s->stats->run.rs_locked / s->stats->ts_tid));
         seq_printf(seq, "  %ums flushing data (in ordered mode)\n",
-            jiffies_to_msecs(s->stats->u.run.rs_flushing / s->stats->ts_tid));
+            jiffies_to_msecs(s->stats->run.rs_flushing / s->stats->ts_tid));
         seq_printf(seq, "  %ums logging transaction\n",
-            jiffies_to_msecs(s->stats->u.run.rs_logging / s->stats->ts_tid));
+            jiffies_to_msecs(s->stats->run.rs_logging / s->stats->ts_tid));
         seq_printf(seq, "  %lluus average transaction commit time\n",
                    div_u64(s->journal->j_average_commit_time, 1000));
         seq_printf(seq, "  %lu handles per transaction\n",
-            s->stats->u.run.rs_handle_count / s->stats->ts_tid);
+            s->stats->run.rs_handle_count / s->stats->ts_tid);
         seq_printf(seq, "  %lu blocks per transaction\n",
-            s->stats->u.run.rs_blocks / s->stats->ts_tid);
+            s->stats->run.rs_blocks / s->stats->ts_tid);
         seq_printf(seq, "  %lu logged blocks per transaction\n",
-            s->stats->u.run.rs_blocks_logged / s->stats->ts_tid);
+            s->stats->run.rs_blocks_logged / s->stats->ts_tid);
         return 0;
 }
 
@@ -872,7 +722,7 @@ static void jbd2_seq_info_stop(struct seq_file *seq, void *v)
 {
 }
 
-static struct seq_operations jbd2_seq_info_ops = {
+static const struct seq_operations jbd2_seq_info_ops = {
         .start  = jbd2_seq_info_start,
         .next   = jbd2_seq_info_next,
         .stop   = jbd2_seq_info_stop,
@@ -920,7 +770,7 @@ static int jbd2_seq_info_release(struct inode *inode, struct file *file)
         return seq_release(inode, file);
 }
 
-static struct file_operations jbd2_seq_info_fops = {
+static const struct file_operations jbd2_seq_info_fops = {
         .owner          = THIS_MODULE,
         .open           = jbd2_seq_info_open,
         .read           = seq_read,
@@ -934,8 +784,6 @@ static void jbd2_stats_proc_init(journal_t *journal)
 {
         journal->j_proc_entry = proc_mkdir(journal->j_devname, proc_jbd2_stats);
         if (journal->j_proc_entry) {
-                proc_create_data("history", S_IRUGO, journal->j_proc_entry,
-                                 &jbd2_seq_history_fops, journal);
                 proc_create_data("info", S_IRUGO, journal->j_proc_entry,
                                  &jbd2_seq_info_fops, journal);
         }
@@ -944,27 +792,9 @@ static void jbd2_stats_proc_init(journal_t *journal)
 static void jbd2_stats_proc_exit(journal_t *journal)
 {
         remove_proc_entry("info", journal->j_proc_entry);
-        remove_proc_entry("history", journal->j_proc_entry);
         remove_proc_entry(journal->j_devname, proc_jbd2_stats);
 }
 
-static void journal_init_stats(journal_t *journal)
-{
-        int size;
-
-        if (!proc_jbd2_stats)
-                return;
-
-        journal->j_history_max = 100;
-        size = sizeof(struct transaction_stats_s) * journal->j_history_max;
-        journal->j_history = kzalloc(size, GFP_KERNEL);
-        if (!journal->j_history) {
-                journal->j_history_max = 0;
-                return;
-        }
-        spin_lock_init(&journal->j_history_lock);
-}
-
 /*
  * Management for journal control blocks: functions to create and
  * destroy journal_t structures, and to initialise and read existing
@@ -1009,7 +839,7 @@ static journal_t * journal_init_common (void)
                 goto fail;
         }
 
-        journal_init_stats(journal);
+        spin_lock_init(&journal->j_history_lock);
 
         return journal;
 fail:
@@ -1115,7 +945,7 @@ journal_t * jbd2_journal_init_inode (struct inode *inode)
         while ((p = strchr(p, '/')))
                 *p = '!';
         p = journal->j_devname + strlen(journal->j_devname);
-        sprintf(p, ":%lu", journal->j_inode->i_ino);
+        sprintf(p, "-%lu", journal->j_inode->i_ino);
         jbd_debug(1,
                   "journal %p: inode %s/%ld, size %Ld, bits %d, blksize %ld\n",
                   journal, inode->i_sb->s_id, inode->i_ino,
diff --git a/fs/jffs2/background.c b/fs/jffs2/background.c
index e9580104b6ba..3ff50da94789 100644
--- a/fs/jffs2/background.c
+++ b/fs/jffs2/background.c
@@ -15,6 +15,7 @@
 #include <linux/completion.h>
 #include <linux/sched.h>
 #include <linux/freezer.h>
+#include <linux/kthread.h>
 #include "nodelist.h"
 
 
@@ -31,7 +32,7 @@ void jffs2_garbage_collect_trigger(struct jffs2_sb_info *c)
 /* This must only ever be called when no GC thread is currently running */
 int jffs2_start_garbage_collect_thread(struct jffs2_sb_info *c)
 {
-        pid_t pid;
+        struct task_struct *tsk;
         int ret = 0;
 
         BUG_ON(c->gc_task);
@@ -39,15 +40,16 @@ int jffs2_start_garbage_collect_thread(struct jffs2_sb_info *c)
         init_completion(&c->gc_thread_start);
         init_completion(&c->gc_thread_exit);
 
-        pid = kernel_thread(jffs2_garbage_collect_thread, c, CLONE_FS|CLONE_FILES);
-        if (pid < 0) {
-                printk(KERN_WARNING "fork failed for JFFS2 garbage collect thread: %d\n", -pid);
+        tsk = kthread_run(jffs2_garbage_collect_thread, c, "jffs2_gcd_mtd%d", c->mtd->index);
+        if (IS_ERR(tsk)) {
+                printk(KERN_WARNING "fork failed for JFFS2 garbage collect thread: %ld\n", -PTR_ERR(tsk));
                 complete(&c->gc_thread_exit);
-                ret = pid;
+                ret = PTR_ERR(tsk);
         } else {
                 /* Wait for it... */
-                D1(printk(KERN_DEBUG "JFFS2: Garbage collect thread is pid %d\n", pid));
+                D1(printk(KERN_DEBUG "JFFS2: Garbage collect thread is pid %d\n", tsk->pid));
                 wait_for_completion(&c->gc_thread_start);
+                ret = tsk->pid;
         }
 
         return ret;
@@ -71,7 +73,6 @@ static int jffs2_garbage_collect_thread(void *_c)
 {
         struct jffs2_sb_info *c = _c;
 
-        daemonize("jffs2_gcd_mtd%d", c->mtd->index);
         allow_signal(SIGKILL);
         allow_signal(SIGSTOP);
         allow_signal(SIGCONT);
@@ -107,6 +108,11 @@ static int jffs2_garbage_collect_thread(void *_c)
                  * the GC thread get there first. */
                 schedule_timeout_interruptible(msecs_to_jiffies(50));
 
+                if (kthread_should_stop()) {
+                        D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread():  kthread_stop() called.\n"));
+                        goto die;
+                }
+
                 /* Put_super will send a SIGKILL and then wait on the sem.
                  */
                 while (signal_pending(current) || freezing(current)) {
diff --git a/fs/jffs2/malloc.c b/fs/jffs2/malloc.c
index 9eff2bdae8a7..c082868910f2 100644
--- a/fs/jffs2/malloc.c
+++ b/fs/jffs2/malloc.c
@@ -39,13 +39,13 @@ int __init jffs2_create_slab_caches(void)
 
         raw_dirent_slab = kmem_cache_create("jffs2_raw_dirent",
                                             sizeof(struct jffs2_raw_dirent),
-                                            0, 0, NULL);
+                                            0, SLAB_HWCACHE_ALIGN, NULL);
         if (!raw_dirent_slab)
                 goto err;
 
         raw_inode_slab = kmem_cache_create("jffs2_raw_inode",
                                            sizeof(struct jffs2_raw_inode),
-                                           0, 0, NULL);
+                                           0, SLAB_HWCACHE_ALIGN, NULL);
         if (!raw_inode_slab)
                 goto err;
 
diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
index 0035c021395a..9a80e8e595d0 100644
--- a/fs/jffs2/super.c
+++ b/fs/jffs2/super.c
@@ -123,7 +123,7 @@ static struct dentry *jffs2_get_parent(struct dentry *child)
         return d_obtain_alias(jffs2_iget(child->d_inode->i_sb, pino));
 }
 
-static struct export_operations jffs2_export_ops = {
+static const struct export_operations jffs2_export_ops = {
         .get_parent = jffs2_get_parent,
         .fh_to_dentry = jffs2_fh_to_dentry,
         .fh_to_parent = jffs2_fh_to_parent,
diff --git a/fs/jfs/super.c b/fs/jfs/super.c
index 37e6dcda8fc8..2234c73fc577 100644
--- a/fs/jfs/super.c
+++ b/fs/jfs/super.c
@@ -178,13 +178,11 @@ static void jfs_put_super(struct super_block *sb)
         rc = jfs_umount(sb);
         if (rc)
                 jfs_err("jfs_umount failed with return code %d", rc);
-        if (sbi->nls_tab)
-                unload_nls(sbi->nls_tab);
-        sbi->nls_tab = NULL;
+
+        unload_nls(sbi->nls_tab);
 
         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
         iput(sbi->direct_inode);
-        sbi->direct_inode = NULL;
 
         kfree(sbi);
 
@@ -347,8 +345,7 @@ static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 
         if (nls_map != (void *) -1) {
                 /* Discard old (if remount) */
-                if (sbi->nls_tab)
-                        unload_nls(sbi->nls_tab);
+                unload_nls(sbi->nls_tab);
                 sbi->nls_tab = nls_map;
         }
         return 1;
diff --git a/fs/libfs.c b/fs/libfs.c
index dcec3d3ea64f..219576c52d80 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -527,14 +527,18 @@ ssize_t simple_read_from_buffer(void __user *to, size_t count, loff_t *ppos,
                                 const void *from, size_t available)
 {
         loff_t pos = *ppos;
+        size_t ret;
+
         if (pos < 0)
                 return -EINVAL;
-        if (pos >= available)
+        if (pos >= available || !count)
                 return 0;
         if (count > available - pos)
                 count = available - pos;
-        if (copy_to_user(to, from + pos, count))
+        ret = copy_to_user(to, from + pos, count);
+        if (ret == count)
                 return -EFAULT;
+        count -= ret;
         *ppos = pos + count;
         return count;
 }
@@ -735,10 +739,11 @@ ssize_t simple_attr_write(struct file *file, const char __user *buf,
         if (copy_from_user(attr->set_buf, buf, size))
                 goto out;
 
-        ret = len; /* claim we got the whole input */
         attr->set_buf[size] = '\0';
         val = simple_strtol(attr->set_buf, NULL, 0);
-        attr->set(attr->data, val);
+        ret = attr->set(attr->data, val);
+        if (ret == 0)
+                ret = len; /* on success, claim we got the whole input */
 out:
         mutex_unlock(&attr->mutex);
         return ret;
diff --git a/fs/lockd/clntlock.c b/fs/lockd/clntlock.c
index 1f3b0fc0d351..fc9032dc8862 100644
--- a/fs/lockd/clntlock.c
+++ b/fs/lockd/clntlock.c
@@ -166,7 +166,7 @@ __be32 nlmclnt_grant(const struct sockaddr *addr, const struct nlm_lock *lock)
                  */
                 if (fl_blocked->fl_u.nfs_fl.owner->pid != lock->svid)
                         continue;
-                if (!nlm_cmp_addr(nlm_addr(block->b_host), addr))
+                if (!rpc_cmp_addr(nlm_addr(block->b_host), addr))
                         continue;
                 if (nfs_compare_fh(NFS_FH(fl_blocked->fl_file->f_path.dentry->d_inode) ,fh) != 0)
                         continue;
diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c
index 4336adba952a..c81249fef11f 100644
--- a/fs/lockd/clntproc.c
+++ b/fs/lockd/clntproc.c
@@ -458,7 +458,7 @@ static void nlmclnt_locks_release_private(struct file_lock *fl)
         nlm_put_lockowner(fl->fl_u.nfs_fl.owner);
 }
 
-static struct file_lock_operations nlmclnt_lock_ops = {
+static const struct file_lock_operations nlmclnt_lock_ops = {
         .fl_copy_lock = nlmclnt_locks_copy_lock,
         .fl_release_private = nlmclnt_locks_release_private,
 };
diff --git a/fs/lockd/host.c b/fs/lockd/host.c
index 7cb076ac6b45..4600c2037b8b 100644
--- a/fs/lockd/host.c
+++ b/fs/lockd/host.c
@@ -111,7 +111,7 @@ static struct nlm_host *nlm_lookup_host(struct nlm_lookup_host_info *ni)
          */
         chain = &nlm_hosts[nlm_hash_address(ni->sap)];
         hlist_for_each_entry(host, pos, chain, h_hash) {
-                if (!nlm_cmp_addr(nlm_addr(host), ni->sap))
+                if (!rpc_cmp_addr(nlm_addr(host), ni->sap))
                         continue;
 
                 /* See if we have an NSM handle for this client */
@@ -125,7 +125,7 @@ static struct nlm_host *nlm_lookup_host(struct nlm_lookup_host_info *ni)
                 if (host->h_server != ni->server)
                         continue;
                 if (ni->server &&
-                    !nlm_cmp_addr(nlm_srcaddr(host), ni->src_sap))
+                    !rpc_cmp_addr(nlm_srcaddr(host), ni->src_sap))
                         continue;
 
                 /* Move to head of hash chain. */
diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index 30c933188dd7..f956651d0f65 100644
--- a/fs/lockd/mon.c
+++ b/fs/lockd/mon.c
@@ -209,7 +209,7 @@ static struct nsm_handle *nsm_lookup_addr(const struct sockaddr *sap)
         struct nsm_handle *nsm;
 
         list_for_each_entry(nsm, &nsm_handles, sm_link)
-                if (nlm_cmp_addr(nsm_addr(nsm), sap))
+                if (rpc_cmp_addr(nsm_addr(nsm), sap))
                         return nsm;
         return NULL;
 }
diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
index e577a78d7bac..d1001790fa9a 100644
--- a/fs/lockd/svclock.c
+++ b/fs/lockd/svclock.c
@@ -705,7 +705,7 @@ static int nlmsvc_same_owner(struct file_lock *fl1, struct file_lock *fl2)
         return fl1->fl_owner == fl2->fl_owner && fl1->fl_pid == fl2->fl_pid;
 }
 
-struct lock_manager_operations nlmsvc_lock_operations = {
+const struct lock_manager_operations nlmsvc_lock_operations = {
         .fl_compare_owner = nlmsvc_same_owner,
         .fl_notify = nlmsvc_notify_blocked,
         .fl_grant = nlmsvc_grant_deferred,
diff --git a/fs/lockd/svcsubs.c b/fs/lockd/svcsubs.c
index 9e4d6aab611b..ad478da7ca63 100644
--- a/fs/lockd/svcsubs.c
+++ b/fs/lockd/svcsubs.c
@@ -417,7 +417,7 @@ EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_sb);
 static int
 nlmsvc_match_ip(void *datap, struct nlm_host *host)
 {
-        return nlm_cmp_addr(nlm_srcaddr(host), datap);
+        return rpc_cmp_addr(nlm_srcaddr(host), datap);
 }
 
 /**
diff --git a/fs/lockd/xdr.c b/fs/lockd/xdr.c
index 0336f2beacde..b583ab0a4cbb 100644
--- a/fs/lockd/xdr.c
+++ b/fs/lockd/xdr.c
@@ -8,7 +8,6 @@
 
 #include <linux/types.h>
 #include <linux/sched.h>
-#include <linux/utsname.h>
 #include <linux/nfs.h>
 
 #include <linux/sunrpc/xdr.h>
diff --git a/fs/lockd/xdr4.c b/fs/lockd/xdr4.c
index e1d528653192..ad9dbbc9145d 100644
--- a/fs/lockd/xdr4.c
+++ b/fs/lockd/xdr4.c
@@ -9,7 +9,6 @@
 
 #include <linux/types.h>
 #include <linux/sched.h>
-#include <linux/utsname.h>
 #include <linux/nfs.h>
 
 #include <linux/sunrpc/xdr.h>
diff --git a/fs/locks.c b/fs/locks.c
index 19ee18a6829b..a8794f233bc9 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -434,7 +434,7 @@ static int lease_mylease_callback(struct file_lock *fl, struct file_lock *try)
         return fl->fl_file == try->fl_file;
 }
 
-static struct lock_manager_operations lease_manager_ops = {
+static const struct lock_manager_operations lease_manager_ops = {
         .fl_break = lease_break_callback,
         .fl_release_private = lease_release_private_callback,
         .fl_mylease = lease_mylease_callback,
diff --git a/fs/minix/dir.c b/fs/minix/dir.c
index d407e7a0b6fe..6198731d7fcd 100644
--- a/fs/minix/dir.c
+++ b/fs/minix/dir.c
@@ -308,14 +308,18 @@ int minix_delete_entry(struct minix_dir_entry *de, struct page *page)
         struct inode *inode = (struct inode*)mapping->host;
         char *kaddr = page_address(page);
         loff_t pos = page_offset(page) + (char*)de - kaddr;
-        unsigned len = minix_sb(inode->i_sb)->s_dirsize;
+        struct minix_sb_info *sbi = minix_sb(inode->i_sb);
+        unsigned len = sbi->s_dirsize;
         int err;
 
         lock_page(page);
         err = __minix_write_begin(NULL, mapping, pos, len,
                                         AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
         if (err == 0) {
-                de->inode = 0;
+                if (sbi->s_version == MINIX_V3)
+                        ((minix3_dirent *) de)->inode = 0;
+                else
+                        de->inode = 0;
                 err = dir_commit_chunk(page, pos, len);
         } else {
                 unlock_page(page);
@@ -440,7 +444,10 @@ void minix_set_link(struct minix_dir_entry *de, struct page *page,
         err = __minix_write_begin(NULL, mapping, pos, sbi->s_dirsize,
                                         AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
         if (err == 0) {
-                de->inode = inode->i_ino;
+                if (sbi->s_version == MINIX_V3)
+                        ((minix3_dirent *) de)->inode = inode->i_ino;
+                else
+                        de->inode = inode->i_ino;
                 err = dir_commit_chunk(page, pos, sbi->s_dirsize);
         } else {
                 unlock_page(page);
@@ -470,7 +477,14 @@ ino_t minix_inode_by_name(struct dentry *dentry)
         ino_t res = 0;
 
         if (de) {
-                res = de->inode;
+                struct address_space *mapping = page->mapping;
+                struct inode *inode = mapping->host;
+                struct minix_sb_info *sbi = minix_sb(inode->i_sb);
+
+                if (sbi->s_version == MINIX_V3)
+                        res = ((minix3_dirent *) de)->inode;
+                else
+                        res = de->inode;
                 dir_put_page(page);
         }
         return res;
diff --git a/fs/namespace.c b/fs/namespace.c
index 7230787d18b0..bdc3cb4fd222 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1640,7 +1640,7 @@ static int do_new_mount(struct path *path, char *type, int flags,
 {
         struct vfsmount *mnt;
 
-        if (!type || !memchr(type, 0, PAGE_SIZE))
+        if (!type)
                 return -EINVAL;
 
         /* we need capabilities... */
@@ -1871,6 +1871,23 @@ int copy_mount_options(const void __user * data, unsigned long *where)
         return 0;
 }
 
+int copy_mount_string(const void __user *data, char **where)
+{
+        char *tmp;
+
+        if (!data) {
+                *where = NULL;
+                return 0;
+        }
+
+        tmp = strndup_user(data, PAGE_SIZE);
+        if (IS_ERR(tmp))
+                return PTR_ERR(tmp);
+
+        *where = tmp;
+        return 0;
+}
+
 /*
  * Flags is a 32-bit value that allows up to 31 non-fs dependent flags to
  * be given to the mount() call (ie: read-only, no-dev, no-suid etc).
@@ -1900,8 +1917,6 @@ long do_mount(char *dev_name, char *dir_name, char *type_page,
 
         if (!dir_name || !*dir_name || !memchr(dir_name, 0, PAGE_SIZE))
                 return -EINVAL;
-        if (dev_name && !memchr(dev_name, 0, PAGE_SIZE))
-                return -EINVAL;
 
         if (data_page)
                 ((char *)data_page)[PAGE_SIZE - 1] = 0;
@@ -2070,40 +2085,42 @@ EXPORT_SYMBOL(create_mnt_ns);
 SYSCALL_DEFINE5(mount, char __user *, dev_name, char __user *, dir_name,
                 char __user *, type, unsigned long, flags, void __user *, data)
 {
-        int retval;
+        int ret;
+        char *kernel_type;
+        char *kernel_dir;
+        char *kernel_dev;
         unsigned long data_page;
-        unsigned long type_page;
-        unsigned long dev_page;
-        char *dir_page;
 
-        retval = copy_mount_options(type, &type_page);
-        if (retval < 0)
-                return retval;
+        ret = copy_mount_string(type, &kernel_type);
+        if (ret < 0)
+                goto out_type;
 
-        dir_page = getname(dir_name);
-        retval = PTR_ERR(dir_page);
-        if (IS_ERR(dir_page))
-                goto out1;
+        kernel_dir = getname(dir_name);
+        if (IS_ERR(kernel_dir)) {
+                ret = PTR_ERR(kernel_dir);
+                goto out_dir;
+        }
 
-        retval = copy_mount_options(dev_name, &dev_page);
-        if (retval < 0)
-                goto out2;
+        ret = copy_mount_string(dev_name, &kernel_dev);
+        if (ret < 0)
+                goto out_dev;
 
-        retval = copy_mount_options(data, &data_page);
-        if (retval < 0)
-                goto out3;
+        ret = copy_mount_options(data, &data_page);
+        if (ret < 0)
+                goto out_data;
 
-        retval = do_mount((char *)dev_page, dir_page, (char *)type_page,
-                          flags, (void *)data_page);
-        free_page(data_page);
+        ret = do_mount(kernel_dev, kernel_dir, kernel_type, flags,
+                (void *) data_page);
 
-out3:
-        free_page(dev_page);
-out2:
-        putname(dir_page);
-out1:
-        free_page(type_page);
-        return retval;
+        free_page(data_page);
+out_data:
+        kfree(kernel_dev);
+out_dev:
+        putname(kernel_dir);
+out_dir:
+        kfree(kernel_type);
+out_type:
+        return ret;
 }
 
 /*
diff --git a/fs/ncpfs/dir.c b/fs/ncpfs/dir.c
index 9c590722d87e..b8b5b30d53f0 100644
--- a/fs/ncpfs/dir.c
+++ b/fs/ncpfs/dir.c
@@ -1241,7 +1241,7 @@ ncp_date_unix2dos(int unix_date, __le16 *time, __le16 *date)
                 month = 2;
         } else {
                 nl_day = (year & 3) || day <= 59 ? day : day - 1;
-                for (month = 0; month < 12; month++)
+                for (month = 1; month < 12; month++)
                         if (day_n[month] > nl_day)
                                 break;
         }
diff --git a/fs/ncpfs/inode.c b/fs/ncpfs/inode.c
index b99ce205b1bd..cf98da1be23e 100644
--- a/fs/ncpfs/inode.c
+++ b/fs/ncpfs/inode.c
@@ -746,16 +746,8 @@ static void ncp_put_super(struct super_block *sb)
 
 #ifdef CONFIG_NCPFS_NLS
         /* unload the NLS charsets */
-        if (server->nls_vol)
-        {
-                unload_nls(server->nls_vol);
-                server->nls_vol = NULL;
-        }
-        if (server->nls_io)
-        {
-                unload_nls(server->nls_io);
-                server->nls_io = NULL;
-        }
+        unload_nls(server->nls_vol);
+        unload_nls(server->nls_io);
 #endif /* CONFIG_NCPFS_NLS */
 
         if (server->info_filp)
diff --git a/fs/ncpfs/ioctl.c b/fs/ncpfs/ioctl.c
index fa038df63ac8..0d58caf4a6e1 100644
--- a/fs/ncpfs/ioctl.c
+++ b/fs/ncpfs/ioctl.c
@@ -223,10 +223,8 @@ ncp_set_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
         oldset_io = server->nls_io;
         server->nls_io = iocharset;
 
-        if (oldset_cp)
-                unload_nls(oldset_cp);
-        if (oldset_io)
-                unload_nls(oldset_io);
+        unload_nls(oldset_cp);
+        unload_nls(oldset_io);
 
         return 0;
 }
@@ -442,7 +440,7 @@ static int __ncp_ioctl(struct inode *inode, struct file *filp,
                         if (dentry) {
                                 struct inode* s_inode = dentry->d_inode;
                                 
-                                if (inode) {
+                                if (s_inode) {
                                         NCP_FINFO(s_inode)->volNumber = vnum;
                                         NCP_FINFO(s_inode)->dirEntNum = de;
                                         NCP_FINFO(s_inode)->DosDirNum = dosde;
diff --git a/fs/ncpfs/mmap.c b/fs/ncpfs/mmap.c
index 5d8dcb9ee326..15458decdb8a 100644
--- a/fs/ncpfs/mmap.c
+++ b/fs/ncpfs/mmap.c
@@ -95,7 +95,7 @@ static int ncp_file_mmap_fault(struct vm_area_struct *area,
         return VM_FAULT_MAJOR;
 }
 
-static struct vm_operations_struct ncp_file_mmap =
+static const struct vm_operations_struct ncp_file_mmap =
 {
         .fault = ncp_file_mmap_fault,
 };
diff --git a/fs/nfs/callback_xdr.c b/fs/nfs/callback_xdr.c
index e5a2dac5f715..76b0aa0f73bf 100644
--- a/fs/nfs/callback_xdr.c
+++ b/fs/nfs/callback_xdr.c
@@ -222,7 +222,7 @@ static unsigned decode_sessionid(struct xdr_stream *xdr,
 
         p = read_buf(xdr, len);
         if (unlikely(p == NULL))
-                return htonl(NFS4ERR_RESOURCE);;
+                return htonl(NFS4ERR_RESOURCE);
 
         memcpy(sid->data, p, len);
         return 0;
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index e350bd6a2334..63976c0ccc25 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -648,8 +648,6 @@ static int nfs_start_lockd(struct nfs_server *server)
                 .hostname       = clp->cl_hostname,
                 .address        = (struct sockaddr *)&clp->cl_addr,
                 .addrlen        = clp->cl_addrlen,
-                .protocol       = server->flags & NFS_MOUNT_TCP ?
-                                                IPPROTO_TCP : IPPROTO_UDP,
                 .nfs_version    = clp->rpc_ops->version,
                 .noresvport     = server->flags & NFS_MOUNT_NORESVPORT ?
                                         1 : 0,
@@ -660,6 +658,14 @@ static int nfs_start_lockd(struct nfs_server *server)
         if (server->flags & NFS_MOUNT_NONLM)
                 return 0;
 
+        switch (clp->cl_proto) {
+                default:
+                        nlm_init.protocol = IPPROTO_TCP;
+                        break;
+                case XPRT_TRANSPORT_UDP:
+                        nlm_init.protocol = IPPROTO_UDP;
+        }
+
         host = nlmclnt_init(&nlm_init);
         if (IS_ERR(host))
                 return PTR_ERR(host);
@@ -787,7 +793,7 @@ static int nfs_init_server(struct nfs_server *server,
         dprintk("--> nfs_init_server()\n");
 
 #ifdef CONFIG_NFS_V3
-        if (data->flags & NFS_MOUNT_VER3)
+        if (data->version == 3)
                 cl_init.rpc_ops = &nfs_v3_clientops;
 #endif
 
@@ -933,10 +939,6 @@ static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, str
                 goto out_error;
 
         nfs_server_set_fsinfo(server, &fsinfo);
-        error = bdi_init(&server->backing_dev_info);
-        if (error)
-                goto out_error;
-
 
         /* Get some general file system info */
         if (server->namelen == 0) {
@@ -968,6 +970,7 @@ static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_serve
         target->acdirmin = source->acdirmin;
         target->acdirmax = source->acdirmax;
         target->caps = source->caps;
+        target->options = source->options;
 }
 
 /*
@@ -995,6 +998,12 @@ static struct nfs_server *nfs_alloc_server(void)
                 return NULL;
         }
 
+        if (bdi_init(&server->backing_dev_info)) {
+                nfs_free_iostats(server->io_stats);
+                kfree(server);
+                return NULL;
+        }
+
         return server;
 }
 
@@ -1529,7 +1538,7 @@ static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
 static void nfs_server_list_stop(struct seq_file *p, void *v);
 static int nfs_server_list_show(struct seq_file *m, void *v);
 
-static struct seq_operations nfs_server_list_ops = {
+static const struct seq_operations nfs_server_list_ops = {
         .start  = nfs_server_list_start,
         .next   = nfs_server_list_next,
         .stop   = nfs_server_list_stop,
@@ -1550,7 +1559,7 @@ static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
 static void nfs_volume_list_stop(struct seq_file *p, void *v);
 static int nfs_volume_list_show(struct seq_file *m, void *v);
 
-static struct seq_operations nfs_volume_list_ops = {
+static const struct seq_operations nfs_volume_list_ops = {
         .start  = nfs_volume_list_start,
         .next   = nfs_volume_list_next,
         .stop   = nfs_volume_list_stop,
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 5021b75d2d1e..f5fdd39e037a 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -59,7 +59,7 @@ static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl);
 static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl);
 static int nfs_setlease(struct file *file, long arg, struct file_lock **fl);
 
-static struct vm_operations_struct nfs_file_vm_ops;
+static const struct vm_operations_struct nfs_file_vm_ops;
 
 const struct file_operations nfs_file_operations = {
         .llseek         = nfs_file_llseek,
@@ -525,6 +525,7 @@ const struct address_space_operations nfs_file_aops = {
         .direct_IO = nfs_direct_IO,
         .migratepage = nfs_migrate_page,
         .launder_page = nfs_launder_page,
+        .error_remove_page = generic_error_remove_page,
 };
 
 /*
@@ -571,7 +572,7 @@ out_unlock:
         return VM_FAULT_SIGBUS;
 }
 
-static struct vm_operations_struct nfs_file_vm_ops = {
+static const struct vm_operations_struct nfs_file_vm_ops = {
         .fault = filemap_fault,
         .page_mkwrite = nfs_vm_page_mkwrite,
 };
diff --git a/fs/nfs/fscache.c b/fs/nfs/fscache.c
index 379be678cb7e..70fad69eb959 100644
--- a/fs/nfs/fscache.c
+++ b/fs/nfs/fscache.c
@@ -58,17 +58,34 @@ void nfs_fscache_release_client_cookie(struct nfs_client *clp)
 /*
  * Get the cache cookie for an NFS superblock.  We have to handle
  * uniquification here because the cache doesn't do it for us.
+ *
+ * The default uniquifier is just an empty string, but it may be overridden
+ * either by the 'fsc=xxx' option to mount, or by inheriting it from the parent
+ * superblock across an automount point of some nature.
  */
-void nfs_fscache_get_super_cookie(struct super_block *sb,
-                                  struct nfs_parsed_mount_data *data)
+void nfs_fscache_get_super_cookie(struct super_block *sb, const char *uniq,
+                                  struct nfs_clone_mount *mntdata)
 {
         struct nfs_fscache_key *key, *xkey;
         struct nfs_server *nfss = NFS_SB(sb);
         struct rb_node **p, *parent;
-        const char *uniq = data->fscache_uniq ?: "";
         int diff, ulen;
 
-        ulen = strlen(uniq);
+        if (uniq) {
+                ulen = strlen(uniq);
+        } else if (mntdata) {
+                struct nfs_server *mnt_s = NFS_SB(mntdata->sb);
+                if (mnt_s->fscache_key) {
+                        uniq = mnt_s->fscache_key->key.uniquifier;
+                        ulen = mnt_s->fscache_key->key.uniq_len;
+                }
+        }
+
+        if (!uniq) {
+                uniq = "";
+                ulen = 1;
+        }
+
         key = kzalloc(sizeof(*key) + ulen, GFP_KERNEL);
         if (!key)
                 return;
diff --git a/fs/nfs/fscache.h b/fs/nfs/fscache.h
index 6e809bb0ff08..b9c572d0679f 100644
--- a/fs/nfs/fscache.h
+++ b/fs/nfs/fscache.h
@@ -74,7 +74,8 @@ extern void nfs_fscache_get_client_cookie(struct nfs_client *);
 extern void nfs_fscache_release_client_cookie(struct nfs_client *);
 
 extern void nfs_fscache_get_super_cookie(struct super_block *,
-                                         struct nfs_parsed_mount_data *);
+                                         const char *,
+                                         struct nfs_clone_mount *);
 extern void nfs_fscache_release_super_cookie(struct super_block *);
 
 extern void nfs_fscache_init_inode_cookie(struct inode *);
@@ -173,7 +174,8 @@ static inline void nfs_fscache_release_client_cookie(struct nfs_client *clp) {}
 
 static inline void nfs_fscache_get_super_cookie(
         struct super_block *sb,
-        struct nfs_parsed_mount_data *data)
+        const char *uniq,
+        struct nfs_clone_mount *mntdata)
 {
 }
 static inline void nfs_fscache_release_super_cookie(struct super_block *sb) {}
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 060022b4651c..faa091865ad0 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -458,49 +458,21 @@ nfs_setattr(struct dentry *dentry, struct iattr *attr)
  */
 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
 {
-        if (i_size_read(inode) < offset) {
-                unsigned long limit;
-
-                limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
-                if (limit != RLIM_INFINITY && offset > limit)
-                        goto out_sig;
-                if (offset > inode->i_sb->s_maxbytes)
-                        goto out_big;
-                spin_lock(&inode->i_lock);
-                i_size_write(inode, offset);
-                spin_unlock(&inode->i_lock);
-        } else {
-                struct address_space *mapping = inode->i_mapping;
+        loff_t oldsize;
+        int err;
 
-                /*
-                 * truncation of in-use swapfiles is disallowed - it would
-                 * cause subsequent swapout to scribble on the now-freed
-                 * blocks.
-                 */
-                if (IS_SWAPFILE(inode))
-                        return -ETXTBSY;
-                spin_lock(&inode->i_lock);
-                i_size_write(inode, offset);
-                spin_unlock(&inode->i_lock);
+        err = inode_newsize_ok(inode, offset);
+        if (err)
+                goto out;
 
-                /*
-                 * unmap_mapping_range is called twice, first simply for
-                 * efficiency so that truncate_inode_pages does fewer
-                 * single-page unmaps.  However after this first call, and
-                 * before truncate_inode_pages finishes, it is possible for
-                 * private pages to be COWed, which remain after
-                 * truncate_inode_pages finishes, hence the second
-                 * unmap_mapping_range call must be made for correctness.
-                 */
-                unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
-                truncate_inode_pages(mapping, offset);
-                unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
-        }
-        return 0;
-out_sig:
-        send_sig(SIGXFSZ, current, 0);
-out_big:
-        return -EFBIG;
+        spin_lock(&inode->i_lock);
+        oldsize = inode->i_size;
+        i_size_write(inode, offset);
+        spin_unlock(&inode->i_lock);
+
+        truncate_pagecache(inode, oldsize, offset);
+out:
+        return err;
 }
 
 /**
diff --git a/fs/nfs/nfs2xdr.c b/fs/nfs/nfs2xdr.c
index c862c9340f9a..5e078b222b4e 100644
--- a/fs/nfs/nfs2xdr.c
+++ b/fs/nfs/nfs2xdr.c
@@ -13,7 +13,6 @@
 #include <linux/time.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
-#include <linux/utsname.h>
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <linux/in.h>
diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index ee6a13f05443..3f8881d1a050 100644
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -7,7 +7,6 @@
  */
 
 #include <linux/mm.h>
-#include <linux/utsname.h>
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <linux/sunrpc/clnt.h>
diff --git a/fs/nfs/nfs3xdr.c b/fs/nfs/nfs3xdr.c
index 35869a4921f1..5fe5492fbd29 100644
--- a/fs/nfs/nfs3xdr.c
+++ b/fs/nfs/nfs3xdr.c
@@ -10,7 +10,6 @@
 #include <linux/time.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
-#include <linux/utsname.h>
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <linux/in.h>
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index be6544aef41f..ed7c269e2514 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -36,7 +36,6 @@
  */
 
 #include <linux/mm.h>
-#include <linux/utsname.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/string.h>
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 1434080aefeb..2ef4fecf3984 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -638,7 +638,7 @@ static void nfs4_fl_release_lock(struct file_lock *fl)
         nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
 }
 
-static struct file_lock_operations nfs4_fl_lock_ops = {
+static const struct file_lock_operations nfs4_fl_lock_ops = {
         .fl_copy_lock = nfs4_fl_copy_lock,
         .fl_release_private = nfs4_fl_release_lock,
 };
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index cfc30d362f94..83ad47cbdd8a 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -39,7 +39,6 @@
 #include <linux/time.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
-#include <linux/utsname.h>
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <linux/in.h>
diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c
index 7be72d90d49d..ef583854d8d0 100644
--- a/fs/nfs/proc.c
+++ b/fs/nfs/proc.c
@@ -32,7 +32,6 @@
 #include <linux/slab.h>
 #include <linux/time.h>
 #include <linux/mm.h>
-#include <linux/utsname.h>
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <linux/in.h>
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index de935692d40d..29786d3b9326 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -728,6 +728,27 @@ static void nfs_umount_begin(struct super_block *sb)
         unlock_kernel();
 }
 
+static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(int flags)
+{
+        struct nfs_parsed_mount_data *data;
+
+        data = kzalloc(sizeof(*data), GFP_KERNEL);
+        if (data) {
+                data->flags             = flags;
+                data->rsize             = NFS_MAX_FILE_IO_SIZE;
+                data->wsize             = NFS_MAX_FILE_IO_SIZE;
+                data->acregmin          = NFS_DEF_ACREGMIN;
+                data->acregmax          = NFS_DEF_ACREGMAX;
+                data->acdirmin          = NFS_DEF_ACDIRMIN;
+                data->acdirmax          = NFS_DEF_ACDIRMAX;
+                data->nfs_server.port   = NFS_UNSPEC_PORT;
+                data->auth_flavors[0]   = RPC_AUTH_UNIX;
+                data->auth_flavor_len   = 1;
+                data->minorversion      = 0;
+        }
+        return data;
+}
+
 /*
  * Sanity-check a server address provided by the mount command.
  *
@@ -1430,10 +1451,13 @@ static int nfs_try_mount(struct nfs_parsed_mount_data *args,
         int status;
 
         if (args->mount_server.version == 0) {
-                if (args->flags & NFS_MOUNT_VER3)
-                        args->mount_server.version = NFS_MNT3_VERSION;
-                else
-                        args->mount_server.version = NFS_MNT_VERSION;
+                switch (args->version) {
+                        default:
+                                args->mount_server.version = NFS_MNT3_VERSION;
+                                break;
+                        case 2:
+                                args->mount_server.version = NFS_MNT_VERSION;
+                }
         }
         request.version = args->mount_server.version;
 
@@ -1634,20 +1658,6 @@ static int nfs_validate_mount_data(void *options,
         if (data == NULL)
                 goto out_no_data;
 
-        args->flags             = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
-        args->rsize             = NFS_MAX_FILE_IO_SIZE;
-        args->wsize             = NFS_MAX_FILE_IO_SIZE;
-        args->acregmin          = NFS_DEF_ACREGMIN;
-        args->acregmax          = NFS_DEF_ACREGMAX;
-        args->acdirmin          = NFS_DEF_ACDIRMIN;
-        args->acdirmax          = NFS_DEF_ACDIRMAX;
-        args->mount_server.port = NFS_UNSPEC_PORT;
-        args->nfs_server.port   = NFS_UNSPEC_PORT;
-        args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
-        args->auth_flavors[0]   = RPC_AUTH_UNIX;
-        args->auth_flavor_len   = 1;
-        args->minorversion      = 0;
-
         switch (data->version) {
         case 1:
                 data->namlen = 0;
@@ -1701,6 +1711,8 @@ static int nfs_validate_mount_data(void *options,
 
                 if (!(data->flags & NFS_MOUNT_TCP))
                         args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
+                else
+                        args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
                 /* N.B. caller will free nfs_server.hostname in all cases */
                 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
                 args->namlen            = data->namlen;
@@ -1778,7 +1790,7 @@ static int nfs_validate_mount_data(void *options,
         }
 
 #ifndef CONFIG_NFS_V3
-        if (args->flags & NFS_MOUNT_VER3)
+        if (args->version == 3)
                 goto out_v3_not_compiled;
 #endif /* !CONFIG_NFS_V3 */
 
@@ -1936,7 +1948,7 @@ static void nfs_fill_super(struct super_block *sb,
         if (data->bsize)
                 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
 
-        if (server->flags & NFS_MOUNT_VER3) {
+        if (server->nfs_client->rpc_ops->version == 3) {
                 /* The VFS shouldn't apply the umask to mode bits. We will do
                  * so ourselves when necessary.
                  */
@@ -1960,7 +1972,7 @@ static void nfs_clone_super(struct super_block *sb,
         sb->s_blocksize = old_sb->s_blocksize;
         sb->s_maxbytes = old_sb->s_maxbytes;
 
-        if (server->flags & NFS_MOUNT_VER3) {
+        if (server->nfs_client->rpc_ops->version == 3) {
                 /* The VFS shouldn't apply the umask to mode bits. We will do
                  * so ourselves when necessary.
                  */
@@ -2094,7 +2106,7 @@ static int nfs_get_sb(struct file_system_type *fs_type,
         };
         int error = -ENOMEM;
 
-        data = kzalloc(sizeof(*data), GFP_KERNEL);
+        data = nfs_alloc_parsed_mount_data(NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
         mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
         if (data == NULL || mntfh == NULL)
                 goto out_free_fh;
@@ -2144,7 +2156,8 @@ static int nfs_get_sb(struct file_system_type *fs_type,
         if (!s->s_root) {
                 /* initial superblock/root creation */
                 nfs_fill_super(s, data);
-                nfs_fscache_get_super_cookie(s, data);
+                nfs_fscache_get_super_cookie(
+                        s, data ? data->fscache_uniq : NULL, NULL);
         }
 
         mntroot = nfs_get_root(s, mntfh);
@@ -2190,8 +2203,8 @@ static void nfs_kill_super(struct super_block *s)
 {
         struct nfs_server *server = NFS_SB(s);
 
-        bdi_unregister(&server->backing_dev_info);
         kill_anon_super(s);
+        bdi_unregister(&server->backing_dev_info);
         nfs_fscache_release_super_cookie(s);
         nfs_free_server(server);
 }
@@ -2245,6 +2258,7 @@ static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
         if (!s->s_root) {
                 /* initial superblock/root creation */
                 nfs_clone_super(s, data->sb);
+                nfs_fscache_get_super_cookie(s, NULL, data);
         }
 
         mntroot = nfs_get_root(s, data->fh);
@@ -2362,18 +2376,7 @@ static int nfs4_validate_mount_data(void *options,
         if (data == NULL)
                 goto out_no_data;
 
-        args->rsize             = NFS_MAX_FILE_IO_SIZE;
-        args->wsize             = NFS_MAX_FILE_IO_SIZE;
-        args->acregmin          = NFS_DEF_ACREGMIN;
-        args->acregmax          = NFS_DEF_ACREGMAX;
-        args->acdirmin          = NFS_DEF_ACDIRMIN;
-        args->acdirmax          = NFS_DEF_ACDIRMAX;
-        args->nfs_server.port   = NFS_UNSPEC_PORT;
-        args->auth_flavors[0]   = RPC_AUTH_UNIX;
-        args->auth_flavor_len   = 1;
         args->version           = 4;
-        args->minorversion      = 0;
-
         switch (data->version) {
         case 1:
                 if (data->host_addrlen > sizeof(args->nfs_server.address))
@@ -2508,7 +2511,8 @@ static int nfs4_remote_get_sb(struct file_system_type *fs_type,
         if (!s->s_root) {
                 /* initial superblock/root creation */
                 nfs4_fill_super(s);
-                nfs_fscache_get_super_cookie(s, data);
+                nfs_fscache_get_super_cookie(
+                        s, data ? data->fscache_uniq : NULL, NULL);
         }
 
         mntroot = nfs4_get_root(s, mntfh);
@@ -2656,7 +2660,7 @@ static int nfs4_get_sb(struct file_system_type *fs_type,
         struct nfs_parsed_mount_data *data;
         int error = -ENOMEM;
 
-        data = kzalloc(sizeof(*data), GFP_KERNEL);
+        data = nfs_alloc_parsed_mount_data(0);
         if (data == NULL)
                 goto out_free_data;
 
@@ -2741,6 +2745,7 @@ static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
         if (!s->s_root) {
                 /* initial superblock/root creation */
                 nfs4_clone_super(s, data->sb);
+                nfs_fscache_get_super_cookie(s, NULL, data);
         }
 
         mntroot = nfs4_get_root(s, data->fh);
@@ -2822,6 +2827,7 @@ static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
         if (!s->s_root) {
                 /* initial superblock/root creation */
                 nfs4_fill_super(s);
+                nfs_fscache_get_super_cookie(s, NULL, data);
         }
 
         mntroot = nfs4_get_root(s, &mntfh);
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index d9462643155c..c1c9e035d4a4 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -1341,6 +1341,8 @@ exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
         if (rv)
                 goto out;
         rv = check_nfsd_access(exp, rqstp);
+        if (rv)
+                fh_put(fhp);
 out:
         exp_put(exp);
         return rv;
@@ -1515,7 +1517,7 @@ static int e_show(struct seq_file *m, void *p)
         return svc_export_show(m, &svc_export_cache, cp);
 }
 
-struct seq_operations nfs_exports_op = {
+const struct seq_operations nfs_exports_op = {
         .start  = e_start,
         .next   = e_next,
         .stop   = e_stop,
diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c
index 01d4ec1c88e0..edf926e1062f 100644
--- a/fs/nfsd/nfs3xdr.c
+++ b/fs/nfsd/nfs3xdr.c
@@ -814,17 +814,6 @@ encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
         return p;
 }
 
-static __be32 *
-encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p,
-                struct svc_fh *fhp)
-{
-        p = encode_post_op_attr(cd->rqstp, p, fhp);
-        *p++ = xdr_one;                 /* yes, a file handle follows */
-        p = encode_fh(p, fhp);
-        fh_put(fhp);
-        return p;
-}
-
 static int
 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
                 const char *name, int namlen)
@@ -836,29 +825,54 @@ compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
         dparent = cd->fh.fh_dentry;
         exp  = cd->fh.fh_export;
 
-        fh_init(fhp, NFS3_FHSIZE);
         if (isdotent(name, namlen)) {
                 if (namlen == 2) {
                         dchild = dget_parent(dparent);
                         if (dchild == dparent) {
                                 /* filesystem root - cannot return filehandle for ".." */
                                 dput(dchild);
-                                return 1;
+                                return -ENOENT;
                         }
                 } else
                         dchild = dget(dparent);
         } else
                 dchild = lookup_one_len(name, dparent, namlen);
         if (IS_ERR(dchild))
-                return 1;
-        if (d_mountpoint(dchild) ||
-            fh_compose(fhp, exp, dchild, &cd->fh) != 0 ||
-            !dchild->d_inode)
-                rv = 1;
+                return -ENOENT;
+        rv = -ENOENT;
+        if (d_mountpoint(dchild))
+                goto out;
+        rv = fh_compose(fhp, exp, dchild, &cd->fh);
+        if (rv)
+                goto out;
+        if (!dchild->d_inode)
+                goto out;
+        rv = 0;
+out:
         dput(dchild);
         return rv;
 }
 
+__be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen)
+{
+        struct svc_fh   fh;
+        int err;
+
+        fh_init(&fh, NFS3_FHSIZE);
+        err = compose_entry_fh(cd, &fh, name, namlen);
+        if (err) {
+                *p++ = 0;
+                *p++ = 0;
+                goto out;
+        }
+        p = encode_post_op_attr(cd->rqstp, p, &fh);
+        *p++ = xdr_one;                 /* yes, a file handle follows */
+        p = encode_fh(p, &fh);
+out:
+        fh_put(&fh);
+        return p;
+}
+
 /*
  * Encode a directory entry. This one works for both normal readdir
  * and readdirplus.
@@ -929,16 +943,8 @@ encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
 
                 p = encode_entry_baggage(cd, p, name, namlen, ino);
 
-                /* throw in readdirplus baggage */
-                if (plus) {
-                        struct svc_fh   fh;
-
-                        if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
-                                *p++ = 0;
-                                *p++ = 0;
-                        } else
-                                p = encode_entryplus_baggage(cd, p, &fh);
-                }
+                if (plus)
+                        p = encode_entryplus_baggage(cd, p, name, namlen);
                 num_entry_words = p - cd->buffer;
         } else if (cd->rqstp->rq_respages[pn+1] != NULL) {
                 /* temporarily encode entry into next page, then move back to
@@ -951,17 +957,8 @@ encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
 
                 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
 
-                /* throw in readdirplus baggage */
-                if (plus) {
-                        struct svc_fh   fh;
-
-                        if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
-                                /* zero out the filehandle */
-                                *p1++ = 0;
-                                *p1++ = 0;
-                        } else
-                                p1 = encode_entryplus_baggage(cd, p1, &fh);
-                }
+                if (plus)
+                        p = encode_entryplus_baggage(cd, p1, name, namlen);
 
                 /* determine entry word length and lengths to go in pages */
                 num_entry_words = p1 - tmp;
diff --git a/fs/nfsd/nfs4acl.c b/fs/nfsd/nfs4acl.c
index 54b8b4140c8f..725d02f210e2 100644
--- a/fs/nfsd/nfs4acl.c
+++ b/fs/nfsd/nfs4acl.c
@@ -321,7 +321,7 @@ _posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
         deny = ~pas.group & pas.other;
         if (deny) {
                 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
-                ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP;
+                ace->flag = eflag;
                 ace->access_mask = deny_mask_from_posix(deny, flags);
                 ace->whotype = NFS4_ACL_WHO_GROUP;
                 ace++;
@@ -335,7 +335,7 @@ _posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
                 if (deny) {
                         ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
                         ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP;
-                        ace->access_mask = mask_from_posix(deny, flags);
+                        ace->access_mask = deny_mask_from_posix(deny, flags);
                         ace->whotype = NFS4_ACL_WHO_NAMED;
                         ace->who = pa->e_id;
                         ace++;
diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 3fd23f7aceca..24e8d78f8dde 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -43,25 +43,30 @@
 #include <linux/sunrpc/xdr.h>
 #include <linux/sunrpc/svc.h>
 #include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/svcsock.h>
 #include <linux/nfsd/nfsd.h>
 #include <linux/nfsd/state.h>
 #include <linux/sunrpc/sched.h>
 #include <linux/nfs4.h>
+#include <linux/sunrpc/xprtsock.h>
 
 #define NFSDDBG_FACILITY                NFSDDBG_PROC
 
 #define NFSPROC4_CB_NULL 0
 #define NFSPROC4_CB_COMPOUND 1
+#define NFS4_STATEID_SIZE 16
 
 /* Index of predefined Linux callback client operations */
 
 enum {
-        NFSPROC4_CLNT_CB_NULL = 0,
+        NFSPROC4_CLNT_CB_NULL = 0,
         NFSPROC4_CLNT_CB_RECALL,
+        NFSPROC4_CLNT_CB_SEQUENCE,
 };
 
 enum nfs_cb_opnum4 {
         OP_CB_RECALL            = 4,
+        OP_CB_SEQUENCE          = 11,
 };
 
 #define NFS4_MAXTAGLEN          20
@@ -70,17 +75,29 @@ enum nfs_cb_opnum4 {
 #define NFS4_dec_cb_null_sz             0
 #define cb_compound_enc_hdr_sz          4
 #define cb_compound_dec_hdr_sz          (3 + (NFS4_MAXTAGLEN >> 2))
+#define sessionid_sz                    (NFS4_MAX_SESSIONID_LEN >> 2)
+#define cb_sequence_enc_sz              (sessionid_sz + 4 +             \
+                                        1 /* no referring calls list yet */)
+#define cb_sequence_dec_sz              (op_dec_sz + sessionid_sz + 4)
+
 #define op_enc_sz                       1
 #define op_dec_sz                       2
 #define enc_nfs4_fh_sz                  (1 + (NFS4_FHSIZE >> 2))
 #define enc_stateid_sz                  (NFS4_STATEID_SIZE >> 2)
 #define NFS4_enc_cb_recall_sz           (cb_compound_enc_hdr_sz +       \
+                                        cb_sequence_enc_sz +            \
                                         1 + enc_stateid_sz +            \
                                         enc_nfs4_fh_sz)
 
 #define NFS4_dec_cb_recall_sz           (cb_compound_dec_hdr_sz  +      \
+                                        cb_sequence_dec_sz +            \
                                         op_dec_sz)
 
+struct nfs4_rpc_args {
+        void                            *args_op;
+        struct nfsd4_cb_sequence        args_seq;
+};
+
 /*
 * Generic encode routines from fs/nfs/nfs4xdr.c
 */
@@ -137,11 +154,13 @@ xdr_error:                                      \
 } while (0)
 
 struct nfs4_cb_compound_hdr {
-        int             status;
-        u32             ident;
+        /* args */
+        u32             ident;  /* minorversion 0 only */
         u32             nops;
         __be32          *nops_p;
         u32             minorversion;
+        /* res */
+        int             status;
         u32             taglen;
         char            *tag;
 };
@@ -238,6 +257,27 @@ encode_cb_recall(struct xdr_stream *xdr, struct nfs4_delegation *dp,
         hdr->nops++;
 }
 
+static void
+encode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *args,
+                   struct nfs4_cb_compound_hdr *hdr)
+{
+        __be32 *p;
+
+        if (hdr->minorversion == 0)
+                return;
+
+        RESERVE_SPACE(1 + NFS4_MAX_SESSIONID_LEN + 20);
+
+        WRITE32(OP_CB_SEQUENCE);
+        WRITEMEM(args->cbs_clp->cl_sessionid.data, NFS4_MAX_SESSIONID_LEN);
+        WRITE32(args->cbs_clp->cl_cb_seq_nr);
+        WRITE32(0);             /* slotid, always 0 */
+        WRITE32(0);             /* highest slotid always 0 */
+        WRITE32(0);             /* cachethis always 0 */
+        WRITE32(0); /* FIXME: support referring_call_lists */
+        hdr->nops++;
+}
+
 static int
 nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p)
 {
@@ -249,15 +289,19 @@ nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p)
 }
 
 static int
-nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, struct nfs4_delegation *args)
+nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p,
+                struct nfs4_rpc_args *rpc_args)
 {
         struct xdr_stream xdr;
+        struct nfs4_delegation *args = rpc_args->args_op;
         struct nfs4_cb_compound_hdr hdr = {
                 .ident = args->dl_ident,
+                .minorversion = rpc_args->args_seq.cbs_minorversion,
         };
 
         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
         encode_cb_compound_hdr(&xdr, &hdr);
+        encode_cb_sequence(&xdr, &rpc_args->args_seq, &hdr);
         encode_cb_recall(&xdr, args, &hdr);
         encode_cb_nops(&hdr);
         return 0;
@@ -299,6 +343,57 @@ decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
         return 0;
 }
 
+/*
+ * Our current back channel implmentation supports a single backchannel
+ * with a single slot.
+ */
+static int
+decode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *res,
+                   struct rpc_rqst *rqstp)
+{
+        struct nfs4_sessionid id;
+        int status;
+        u32 dummy;
+        __be32 *p;
+
+        if (res->cbs_minorversion == 0)
+                return 0;
+
+        status = decode_cb_op_hdr(xdr, OP_CB_SEQUENCE);
+        if (status)
+                return status;
+
+        /*
+         * If the server returns different values for sessionID, slotID or
+         * sequence number, the server is looney tunes.
+         */
+        status = -ESERVERFAULT;
+
+        READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
+        memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN);
+        p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN);
+        if (memcmp(id.data, res->cbs_clp->cl_sessionid.data,
+                   NFS4_MAX_SESSIONID_LEN)) {
+                dprintk("%s Invalid session id\n", __func__);
+                goto out;
+        }
+        READ32(dummy);
+        if (dummy != res->cbs_clp->cl_cb_seq_nr) {
+                dprintk("%s Invalid sequence number\n", __func__);
+                goto out;
+        }
+        READ32(dummy);  /* slotid must be 0 */
+        if (dummy != 0) {
+                dprintk("%s Invalid slotid\n", __func__);
+                goto out;
+        }
+        /* FIXME: process highest slotid and target highest slotid */
+        status = 0;
+out:
+        return status;
+}
+
+
 static int
 nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p)
 {
@@ -306,7 +401,8 @@ nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p)
 }
 
 static int
-nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p)
+nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p,
+                struct nfsd4_cb_sequence *seq)
 {
         struct xdr_stream xdr;
         struct nfs4_cb_compound_hdr hdr;
@@ -316,6 +412,11 @@ nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p)
         status = decode_cb_compound_hdr(&xdr, &hdr);
         if (status)
                 goto out;
+        if (seq) {
+                status = decode_cb_sequence(&xdr, seq, rqstp);
+                if (status)
+                        goto out;
+        }
         status = decode_cb_op_hdr(&xdr, OP_CB_RECALL);
 out:
         return status;
@@ -377,16 +478,15 @@ static int max_cb_time(void)
 
 int setup_callback_client(struct nfs4_client *clp)
 {
-        struct sockaddr_in      addr;
         struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
         struct rpc_timeout      timeparms = {
                 .to_initval     = max_cb_time(),
                 .to_retries     = 0,
         };
         struct rpc_create_args args = {
-                .protocol       = IPPROTO_TCP,
-                .address        = (struct sockaddr *)&addr,
-                .addrsize       = sizeof(addr),
+                .protocol       = XPRT_TRANSPORT_TCP,
+                .address        = (struct sockaddr *) &cb->cb_addr,
+                .addrsize       = cb->cb_addrlen,
                 .timeout        = &timeparms,
                 .program        = &cb_program,
                 .prognumber     = cb->cb_prog,
@@ -399,13 +499,10 @@ int setup_callback_client(struct nfs4_client *clp)
 
         if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5))
                 return -EINVAL;
-
-        /* Initialize address */
-        memset(&addr, 0, sizeof(addr));
-        addr.sin_family = AF_INET;
-        addr.sin_port = htons(cb->cb_port);
-        addr.sin_addr.s_addr = htonl(cb->cb_addr);
-
+        if (cb->cb_minorversion) {
+                args.bc_xprt = clp->cl_cb_xprt;
+                args.protocol = XPRT_TRANSPORT_BC_TCP;
+        }
         /* Create RPC client */
         client = rpc_create(&args);
         if (IS_ERR(client)) {
@@ -439,42 +536,29 @@ static const struct rpc_call_ops nfsd4_cb_probe_ops = {
         .rpc_call_done = nfsd4_cb_probe_done,
 };
 
-static struct rpc_cred *lookup_cb_cred(struct nfs4_cb_conn *cb)
-{
-        struct auth_cred acred = {
-                .machine_cred = 1
-        };
+static struct rpc_cred *callback_cred;
 
-        /*
-         * Note in the gss case this doesn't actually have to wait for a
-         * gss upcall (or any calls to the client); this just creates a
-         * non-uptodate cred which the rpc state machine will fill in with
-         * a refresh_upcall later.
-         */
-        return rpcauth_lookup_credcache(cb->cb_client->cl_auth, &acred,
-                                                        RPCAUTH_LOOKUP_NEW);
+int set_callback_cred(void)
+{
+        callback_cred = rpc_lookup_machine_cred();
+        if (!callback_cred)
+                return -ENOMEM;
+        return 0;
 }
 
+
 void do_probe_callback(struct nfs4_client *clp)
 {
         struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
         struct rpc_message msg = {
                 .rpc_proc       = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL],
                 .rpc_argp       = clp,
+                .rpc_cred       = callback_cred
         };
-        struct rpc_cred *cred;
         int status;
 
-        cred = lookup_cb_cred(cb);
-        if (IS_ERR(cred)) {
-                status = PTR_ERR(cred);
-                goto out;
-        }
-        cb->cb_cred = cred;
-        msg.rpc_cred = cb->cb_cred;
         status = rpc_call_async(cb->cb_client, &msg, RPC_TASK_SOFT,
                                 &nfsd4_cb_probe_ops, (void *)clp);
-out:
         if (status) {
                 warn_no_callback_path(clp, status);
                 put_nfs4_client(clp);
@@ -503,11 +587,95 @@ nfsd4_probe_callback(struct nfs4_client *clp)
         do_probe_callback(clp);
 }
 
+/*
+ * There's currently a single callback channel slot.
+ * If the slot is available, then mark it busy.  Otherwise, set the
+ * thread for sleeping on the callback RPC wait queue.
+ */
+static int nfsd41_cb_setup_sequence(struct nfs4_client *clp,
+                struct rpc_task *task)
+{
+        struct nfs4_rpc_args *args = task->tk_msg.rpc_argp;
+        u32 *ptr = (u32 *)clp->cl_sessionid.data;
+        int status = 0;
+
+        dprintk("%s: %u:%u:%u:%u\n", __func__,
+                ptr[0], ptr[1], ptr[2], ptr[3]);
+
+        if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) {
+                rpc_sleep_on(&clp->cl_cb_waitq, task, NULL);
+                dprintk("%s slot is busy\n", __func__);
+                status = -EAGAIN;
+                goto out;
+        }
+
+        /*
+         * We'll need the clp during XDR encoding and decoding,
+         * and the sequence during decoding to verify the reply
+         */
+        args->args_seq.cbs_clp = clp;
+        task->tk_msg.rpc_resp = &args->args_seq;
+
+out:
+        dprintk("%s status=%d\n", __func__, status);
+        return status;
+}
+
+/*
+ * TODO: cb_sequence should support referring call lists, cachethis, multiple
+ * slots, and mark callback channel down on communication errors.
+ */
+static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata)
+{
+        struct nfs4_delegation *dp = calldata;
+        struct nfs4_client *clp = dp->dl_client;
+        struct nfs4_rpc_args *args = task->tk_msg.rpc_argp;
+        u32 minorversion = clp->cl_cb_conn.cb_minorversion;
+        int status = 0;
+
+        args->args_seq.cbs_minorversion = minorversion;
+        if (minorversion) {
+                status = nfsd41_cb_setup_sequence(clp, task);
+                if (status) {
+                        if (status != -EAGAIN) {
+                                /* terminate rpc task */
+                                task->tk_status = status;
+                                task->tk_action = NULL;
+                        }
+                        return;
+                }
+        }
+        rpc_call_start(task);
+}
+
+static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
+{
+        struct nfs4_delegation *dp = calldata;
+        struct nfs4_client *clp = dp->dl_client;
+
+        dprintk("%s: minorversion=%d\n", __func__,
+                clp->cl_cb_conn.cb_minorversion);
+
+        if (clp->cl_cb_conn.cb_minorversion) {
+                /* No need for lock, access serialized in nfsd4_cb_prepare */
+                ++clp->cl_cb_seq_nr;
+                clear_bit(0, &clp->cl_cb_slot_busy);
+                rpc_wake_up_next(&clp->cl_cb_waitq);
+                dprintk("%s: freed slot, new seqid=%d\n", __func__,
+                        clp->cl_cb_seq_nr);
+
+                /* We're done looking into the sequence information */
+                task->tk_msg.rpc_resp = NULL;
+        }
+}
+
 static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
 {
         struct nfs4_delegation *dp = calldata;
         struct nfs4_client *clp = dp->dl_client;
 
+        nfsd4_cb_done(task, calldata);
+
         switch (task->tk_status) {
         case -EIO:
                 /* Network partition? */
@@ -520,16 +688,19 @@ static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
                 break;
         default:
                 /* success, or error we can't handle */
-                return;
+                goto done;
         }
         if (dp->dl_retries--) {
                 rpc_delay(task, 2*HZ);
                 task->tk_status = 0;
                 rpc_restart_call(task);
+                return;
         } else {
                 atomic_set(&clp->cl_cb_conn.cb_set, 0);
                 warn_no_callback_path(clp, task->tk_status);
         }
+done:
+        kfree(task->tk_msg.rpc_argp);
 }
 
 static void nfsd4_cb_recall_release(void *calldata)
@@ -542,6 +713,7 @@ static void nfsd4_cb_recall_release(void *calldata)
 }
 
 static const struct rpc_call_ops nfsd4_cb_recall_ops = {
+        .rpc_call_prepare = nfsd4_cb_prepare,
         .rpc_call_done = nfsd4_cb_recall_done,
         .rpc_release = nfsd4_cb_recall_release,
 };
@@ -554,17 +726,24 @@ nfsd4_cb_recall(struct nfs4_delegation *dp)
 {
         struct nfs4_client *clp = dp->dl_client;
         struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client;
+        struct nfs4_rpc_args *args;
         struct rpc_message msg = {
                 .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL],
-                .rpc_argp = dp,
-                .rpc_cred = clp->cl_cb_conn.cb_cred
+                .rpc_cred = callback_cred
         };
-        int status;
+        int status = -ENOMEM;
 
+        args = kzalloc(sizeof(*args), GFP_KERNEL);
+        if (!args)
+                goto out;
+        args->args_op = dp;
+        msg.rpc_argp = args;
         dp->dl_retries = 1;
         status = rpc_call_async(clnt, &msg, RPC_TASK_SOFT,
                                 &nfsd4_cb_recall_ops, dp);
+out:
         if (status) {
+                kfree(args);
                 put_nfs4_client(clp);
                 nfs4_put_delegation(dp);
         }
diff --git a/fs/nfsd/nfs4idmap.c b/fs/nfsd/nfs4idmap.c
index cdfa86fa1471..ba2c199592fd 100644
--- a/fs/nfsd/nfs4idmap.c
+++ b/fs/nfsd/nfs4idmap.c
@@ -38,7 +38,6 @@
 #include <linux/init.h>
 
 #include <linux/mm.h>
-#include <linux/utsname.h>
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <linux/sunrpc/clnt.h>
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 7c8801769a3c..bebc0c2e1b0a 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -68,7 +68,6 @@ check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
                    u32 *bmval, u32 *writable)
 {
         struct dentry *dentry = cstate->current_fh.fh_dentry;
-        struct svc_export *exp = cstate->current_fh.fh_export;
 
         /*
          * Check about attributes are supported by the NFSv4 server or not.
@@ -80,17 +79,13 @@ check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
                 return nfserr_attrnotsupp;
 
         /*
-         * Check FATTR4_WORD0_ACL & FATTR4_WORD0_FS_LOCATIONS can be supported
+         * Check FATTR4_WORD0_ACL can be supported
          * in current environment or not.
          */
         if (bmval[0] & FATTR4_WORD0_ACL) {
                 if (!IS_POSIXACL(dentry->d_inode))
                         return nfserr_attrnotsupp;
         }
-        if (bmval[0] & FATTR4_WORD0_FS_LOCATIONS) {
-                if (exp->ex_fslocs.locations == NULL)
-                        return nfserr_attrnotsupp;
-        }
 
         /*
          * According to spec, read-only attributes return ERR_INVAL.
@@ -123,6 +118,35 @@ nfsd4_check_open_attributes(struct svc_rqst *rqstp,
         return status;
 }
 
+static int
+is_create_with_attrs(struct nfsd4_open *open)
+{
+        return open->op_create == NFS4_OPEN_CREATE
+                && (open->op_createmode == NFS4_CREATE_UNCHECKED
+                    || open->op_createmode == NFS4_CREATE_GUARDED
+                    || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
+}
+
+/*
+ * if error occurs when setting the acl, just clear the acl bit
+ * in the returned attr bitmap.
+ */
+static void
+do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
+                struct nfs4_acl *acl, u32 *bmval)
+{
+        __be32 status;
+
+        status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
+        if (status)
+                /*
+                 * We should probably fail the whole open at this point,
+                 * but we've already created the file, so it's too late;
+                 * So this seems the least of evils:
+                 */
+                bmval[0] &= ~FATTR4_WORD0_ACL;
+}
+
 static inline void
 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 {
@@ -206,6 +230,9 @@ do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_o
         if (status)
                 goto out;
 
+        if (is_create_with_attrs(open) && open->op_acl != NULL)
+                do_set_nfs4_acl(rqstp, &resfh, open->op_acl, open->op_bmval);
+
         set_change_info(&open->op_cinfo, current_fh);
         fh_dup2(current_fh, &resfh);
 
@@ -536,12 +563,17 @@ nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
                 status = nfserr_badtype;
         }
 
-        if (!status) {
-                fh_unlock(&cstate->current_fh);
-                set_change_info(&create->cr_cinfo, &cstate->current_fh);
-                fh_dup2(&cstate->current_fh, &resfh);
-        }
+        if (status)
+                goto out;
+
+        if (create->cr_acl != NULL)
+                do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
+                                create->cr_bmval);
 
+        fh_unlock(&cstate->current_fh);
+        set_change_info(&create->cr_cinfo, &cstate->current_fh);
+        fh_dup2(&cstate->current_fh, &resfh);
+out:
         fh_put(&resfh);
         return status;
 }
@@ -947,34 +979,6 @@ static struct nfsd4_operation nfsd4_ops[];
 static const char *nfsd4_op_name(unsigned opnum);
 
 /*
- * This is a replay of a compound for which no cache entry pages
- * were used. Encode the sequence operation, and if cachethis is FALSE
- * encode the uncache rep error on the next operation.
- */
-static __be32
-nfsd4_enc_uncached_replay(struct nfsd4_compoundargs *args,
-                         struct nfsd4_compoundres *resp)
-{
-        struct nfsd4_op *op;
-
-        dprintk("--> %s resp->opcnt %d ce_cachethis %u \n", __func__,
-                resp->opcnt, resp->cstate.slot->sl_cache_entry.ce_cachethis);
-
-        /* Encode the replayed sequence operation */
-        BUG_ON(resp->opcnt != 1);
-        op = &args->ops[resp->opcnt - 1];
-        nfsd4_encode_operation(resp, op);
-
-        /*return nfserr_retry_uncached_rep in next operation. */
-        if (resp->cstate.slot->sl_cache_entry.ce_cachethis == 0) {
-                op = &args->ops[resp->opcnt++];
-                op->status = nfserr_retry_uncached_rep;
-                nfsd4_encode_operation(resp, op);
-        }
-        return op->status;
-}
-
-/*
  * Enforce NFSv4.1 COMPOUND ordering rules.
  *
  * TODO:
@@ -1083,13 +1087,10 @@ nfsd4_proc_compound(struct svc_rqst *rqstp,
                         BUG_ON(op->status == nfs_ok);
 
 encode_op:
-                /* Only from SEQUENCE or CREATE_SESSION */
+                /* Only from SEQUENCE */
                 if (resp->cstate.status == nfserr_replay_cache) {
                         dprintk("%s NFS4.1 replay from cache\n", __func__);
-                        if (nfsd4_not_cached(resp))
-                                status = nfsd4_enc_uncached_replay(args, resp);
-                        else
-                                status = op->status;
+                        status = op->status;
                         goto out;
                 }
                 if (op->status == nfserr_replay_me) {
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 980a216a48c8..2153f9bdbebd 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -55,6 +55,7 @@
 #include <linux/lockd/bind.h>
 #include <linux/module.h>
 #include <linux/sunrpc/svcauth_gss.h>
+#include <linux/sunrpc/clnt.h>
 
 #define NFSDDBG_FACILITY                NFSDDBG_PROC
 
@@ -413,36 +414,65 @@ gen_sessionid(struct nfsd4_session *ses)
 }
 
 /*
- * Give the client the number of slots it requests bound by
- * NFSD_MAX_SLOTS_PER_SESSION and by sv_drc_max_pages.
+ * The protocol defines ca_maxresponssize_cached to include the size of
+ * the rpc header, but all we need to cache is the data starting after
+ * the end of the initial SEQUENCE operation--the rest we regenerate
+ * each time.  Therefore we can advertise a ca_maxresponssize_cached
+ * value that is the number of bytes in our cache plus a few additional
+ * bytes.  In order to stay on the safe side, and not promise more than
+ * we can cache, those additional bytes must be the minimum possible: 24
+ * bytes of rpc header (xid through accept state, with AUTH_NULL
+ * verifier), 12 for the compound header (with zero-length tag), and 44
+ * for the SEQUENCE op response:
+ */
+#define NFSD_MIN_HDR_SEQ_SZ  (24 + 12 + 44)
+
+/*
+ * Give the client the number of ca_maxresponsesize_cached slots it
+ * requests, of size bounded by NFSD_SLOT_CACHE_SIZE,
+ * NFSD_MAX_MEM_PER_SESSION, and nfsd_drc_max_mem. Do not allow more
+ * than NFSD_MAX_SLOTS_PER_SESSION.
  *
- * If we run out of pages (sv_drc_pages_used == sv_drc_max_pages) we
- * should (up to a point) re-negotiate active sessions and reduce their
- * slot usage to make rooom for new connections. For now we just fail the
- * create session.
+ * If we run out of reserved DRC memory we should (up to a point)
+ * re-negotiate active sessions and reduce their slot usage to make
+ * rooom for new connections. For now we just fail the create session.
  */
-static int set_forechannel_maxreqs(struct nfsd4_channel_attrs *fchan)
+static int set_forechannel_drc_size(struct nfsd4_channel_attrs *fchan)
 {
-        int status = 0, np = fchan->maxreqs * NFSD_PAGES_PER_SLOT;
+        int mem, size = fchan->maxresp_cached;
 
         if (fchan->maxreqs < 1)
                 return nfserr_inval;
-        else if (fchan->maxreqs > NFSD_MAX_SLOTS_PER_SESSION)
-                fchan->maxreqs = NFSD_MAX_SLOTS_PER_SESSION;
 
-        spin_lock(&nfsd_serv->sv_lock);
-        if (np + nfsd_serv->sv_drc_pages_used > nfsd_serv->sv_drc_max_pages)
-                np = nfsd_serv->sv_drc_max_pages - nfsd_serv->sv_drc_pages_used;
-        nfsd_serv->sv_drc_pages_used += np;
-        spin_unlock(&nfsd_serv->sv_lock);
+        if (size < NFSD_MIN_HDR_SEQ_SZ)
+                size = NFSD_MIN_HDR_SEQ_SZ;
+        size -= NFSD_MIN_HDR_SEQ_SZ;
+        if (size > NFSD_SLOT_CACHE_SIZE)
+                size = NFSD_SLOT_CACHE_SIZE;
+
+        /* bound the maxreqs by NFSD_MAX_MEM_PER_SESSION */
+        mem = fchan->maxreqs * size;
+        if (mem > NFSD_MAX_MEM_PER_SESSION) {
+                fchan->maxreqs = NFSD_MAX_MEM_PER_SESSION / size;
+                if (fchan->maxreqs > NFSD_MAX_SLOTS_PER_SESSION)
+                        fchan->maxreqs = NFSD_MAX_SLOTS_PER_SESSION;
+                mem = fchan->maxreqs * size;
+        }
 
-        if (np <= 0) {
-                status = nfserr_resource;
-                fchan->maxreqs = 0;
-        } else
-                fchan->maxreqs = np / NFSD_PAGES_PER_SLOT;
+        spin_lock(&nfsd_drc_lock);
+        /* bound the total session drc memory ussage */
+        if (mem + nfsd_drc_mem_used > nfsd_drc_max_mem) {
+                fchan->maxreqs = (nfsd_drc_max_mem - nfsd_drc_mem_used) / size;
+                mem = fchan->maxreqs * size;
+        }
+        nfsd_drc_mem_used += mem;
+        spin_unlock(&nfsd_drc_lock);
 
-        return status;
+        if (fchan->maxreqs == 0)
+                return nfserr_serverfault;
+
+        fchan->maxresp_cached = size + NFSD_MIN_HDR_SEQ_SZ;
+        return 0;
 }
 
 /*
@@ -466,36 +496,41 @@ static int init_forechannel_attrs(struct svc_rqst *rqstp,
                 fchan->maxresp_sz = maxcount;
         session_fchan->maxresp_sz = fchan->maxresp_sz;
 
-        /* Set the max response cached size our default which is
-         * a multiple of PAGE_SIZE and small */
-        session_fchan->maxresp_cached = NFSD_PAGES_PER_SLOT * PAGE_SIZE;
-        fchan->maxresp_cached = session_fchan->maxresp_cached;
-
         /* Use the client's maxops if possible */
         if (fchan->maxops > NFSD_MAX_OPS_PER_COMPOUND)
                 fchan->maxops = NFSD_MAX_OPS_PER_COMPOUND;
         session_fchan->maxops = fchan->maxops;
 
-        /* try to use the client requested number of slots */
-        if (fchan->maxreqs > NFSD_MAX_SLOTS_PER_SESSION)
-                fchan->maxreqs = NFSD_MAX_SLOTS_PER_SESSION;
-
         /* FIXME: Error means no more DRC pages so the server should
          * recover pages from existing sessions. For now fail session
          * creation.
          */
-        status = set_forechannel_maxreqs(fchan);
+        status = set_forechannel_drc_size(fchan);
 
+        session_fchan->maxresp_cached = fchan->maxresp_cached;
         session_fchan->maxreqs = fchan->maxreqs;
+
+        dprintk("%s status %d\n", __func__, status);
         return status;
 }
 
+static void
+free_session_slots(struct nfsd4_session *ses)
+{
+        int i;
+
+        for (i = 0; i < ses->se_fchannel.maxreqs; i++)
+                kfree(ses->se_slots[i]);
+}
+
 static int
 alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp,
                    struct nfsd4_create_session *cses)
 {
         struct nfsd4_session *new, tmp;
-        int idx, status = nfserr_resource, slotsize;
+        struct nfsd4_slot *sp;
+        int idx, slotsize, cachesize, i;
+        int status;
 
         memset(&tmp, 0, sizeof(tmp));
 
@@ -506,14 +541,27 @@ alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp,
         if (status)
                 goto out;
 
-        /* allocate struct nfsd4_session and slot table in one piece */
-        slotsize = tmp.se_fchannel.maxreqs * sizeof(struct nfsd4_slot);
+        BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot)
+                     + sizeof(struct nfsd4_session) > PAGE_SIZE);
+
+        status = nfserr_serverfault;
+        /* allocate struct nfsd4_session and slot table pointers in one piece */
+        slotsize = tmp.se_fchannel.maxreqs * sizeof(struct nfsd4_slot *);
         new = kzalloc(sizeof(*new) + slotsize, GFP_KERNEL);
         if (!new)
                 goto out;
 
         memcpy(new, &tmp, sizeof(*new));
 
+        /* allocate each struct nfsd4_slot and data cache in one piece */
+        cachesize = new->se_fchannel.maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
+        for (i = 0; i < new->se_fchannel.maxreqs; i++) {
+                sp = kzalloc(sizeof(*sp) + cachesize, GFP_KERNEL);
+                if (!sp)
+                        goto out_free;
+                new->se_slots[i] = sp;
+        }
+
         new->se_client = clp;
         gen_sessionid(new);
         idx = hash_sessionid(&new->se_sessionid);
@@ -530,6 +578,10 @@ alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp,
         status = nfs_ok;
 out:
         return status;
+out_free:
+        free_session_slots(new);
+        kfree(new);
+        goto out;
 }
 
 /* caller must hold sessionid_lock */
@@ -572,19 +624,16 @@ release_session(struct nfsd4_session *ses)
         nfsd4_put_session(ses);
 }
 
-static void nfsd4_release_respages(struct page **respages, short resused);
-
 void
 free_session(struct kref *kref)
 {
         struct nfsd4_session *ses;
-        int i;
 
         ses = container_of(kref, struct nfsd4_session, se_ref);
-        for (i = 0; i < ses->se_fchannel.maxreqs; i++) {
-                struct nfsd4_cache_entry *e = &ses->se_slots[i].sl_cache_entry;
-                nfsd4_release_respages(e->ce_respages, e->ce_resused);
-        }
+        spin_lock(&nfsd_drc_lock);
+        nfsd_drc_mem_used -= ses->se_fchannel.maxreqs * NFSD_SLOT_CACHE_SIZE;
+        spin_unlock(&nfsd_drc_lock);
+        free_session_slots(ses);
         kfree(ses);
 }
 
@@ -647,18 +696,14 @@ shutdown_callback_client(struct nfs4_client *clp)
                 clp->cl_cb_conn.cb_client = NULL;
                 rpc_shutdown_client(clnt);
         }
-        if (clp->cl_cb_conn.cb_cred) {
-                put_rpccred(clp->cl_cb_conn.cb_cred);
-                clp->cl_cb_conn.cb_cred = NULL;
-        }
 }
 
 static inline void
 free_client(struct nfs4_client *clp)
 {
         shutdown_callback_client(clp);
-        nfsd4_release_respages(clp->cl_slot.sl_cache_entry.ce_respages,
-                             clp->cl_slot.sl_cache_entry.ce_resused);
+        if (clp->cl_cb_xprt)
+                svc_xprt_put(clp->cl_cb_xprt);
         if (clp->cl_cred.cr_group_info)
                 put_group_info(clp->cl_cred.cr_group_info);
         kfree(clp->cl_principal);
@@ -714,25 +759,6 @@ expire_client(struct nfs4_client *clp)
         put_nfs4_client(clp);
 }
 
-static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
-{
-        struct nfs4_client *clp;
-
-        clp = alloc_client(name);
-        if (clp == NULL)
-                return NULL;
-        memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
-        atomic_set(&clp->cl_count, 1);
-        atomic_set(&clp->cl_cb_conn.cb_set, 0);
-        INIT_LIST_HEAD(&clp->cl_idhash);
-        INIT_LIST_HEAD(&clp->cl_strhash);
-        INIT_LIST_HEAD(&clp->cl_openowners);
-        INIT_LIST_HEAD(&clp->cl_delegations);
-        INIT_LIST_HEAD(&clp->cl_sessions);
-        INIT_LIST_HEAD(&clp->cl_lru);
-        return clp;
-}
-
 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
 {
         memcpy(target->cl_verifier.data, source->data,
@@ -795,6 +821,46 @@ static void gen_confirm(struct nfs4_client *clp)
         *p++ = i++;
 }
 
+static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir,
+                struct svc_rqst *rqstp, nfs4_verifier *verf)
+{
+        struct nfs4_client *clp;
+        struct sockaddr *sa = svc_addr(rqstp);
+        char *princ;
+
+        clp = alloc_client(name);
+        if (clp == NULL)
+                return NULL;
+
+        princ = svc_gss_principal(rqstp);
+        if (princ) {
+                clp->cl_principal = kstrdup(princ, GFP_KERNEL);
+                if (clp->cl_principal == NULL) {
+                        free_client(clp);
+                        return NULL;
+                }
+        }
+
+        memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
+        atomic_set(&clp->cl_count, 1);
+        atomic_set(&clp->cl_cb_conn.cb_set, 0);
+        INIT_LIST_HEAD(&clp->cl_idhash);
+        INIT_LIST_HEAD(&clp->cl_strhash);
+        INIT_LIST_HEAD(&clp->cl_openowners);
+        INIT_LIST_HEAD(&clp->cl_delegations);
+        INIT_LIST_HEAD(&clp->cl_sessions);
+        INIT_LIST_HEAD(&clp->cl_lru);
+        clear_bit(0, &clp->cl_cb_slot_busy);
+        rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
+        copy_verf(clp, verf);
+        rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
+        clp->cl_flavor = rqstp->rq_flavor;
+        copy_cred(&clp->cl_cred, &rqstp->rq_cred);
+        gen_confirm(clp);
+
+        return clp;
+}
+
 static int check_name(struct xdr_netobj name)
 {
         if (name.len == 0) 
@@ -902,93 +968,40 @@ find_unconfirmed_client_by_str(const char *dname, unsigned int hashval,
         return NULL;
 }
 
-/* a helper function for parse_callback */
-static int
-parse_octet(unsigned int *lenp, char **addrp)
-{
-        unsigned int len = *lenp;
-        char *p = *addrp;
-        int n = -1;
-        char c;
-
-        for (;;) {
-                if (!len)
-                        break;
-                len--;
-                c = *p++;
-                if (c == '.')
-                        break;
-                if ((c < '0') || (c > '9')) {
-                        n = -1;
-                        break;
-                }
-                if (n < 0)
-                        n = 0;
-                n = (n * 10) + (c - '0');
-                if (n > 255) {
-                        n = -1;
-                        break;
-                }
-        }
-        *lenp = len;
-        *addrp = p;
-        return n;
-}
-
-/* parse and set the setclientid ipv4 callback address */
-static int
-parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
-{
-        int temp = 0;
-        u32 cbaddr = 0;
-        u16 cbport = 0;
-        u32 addrlen = addr_len;
-        char *addr = addr_val;
-        int i, shift;
-
-        /* ipaddress */
-        shift = 24;
-        for(i = 4; i > 0  ; i--) {
-                if ((temp = parse_octet(&addrlen, &addr)) < 0) {
-                        return 0;
-                }
-                cbaddr |= (temp << shift);
-                if (shift > 0)
-                shift -= 8;
-        }
-        *cbaddrp = cbaddr;
-
-        /* port */
-        shift = 8;
-        for(i = 2; i > 0  ; i--) {
-                if ((temp = parse_octet(&addrlen, &addr)) < 0) {
-                        return 0;
-                }
-                cbport |= (temp << shift);
-                if (shift > 0)
-                        shift -= 8;
-        }
-        *cbportp = cbport;
-        return 1;
-}
-
 static void
-gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
+gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, u32 scopeid)
 {
         struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
-
-        /* Currently, we only support tcp for the callback channel */
-        if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
+        unsigned short expected_family;
+
+        /* Currently, we only support tcp and tcp6 for the callback channel */
+        if (se->se_callback_netid_len == 3 &&
+            !memcmp(se->se_callback_netid_val, "tcp", 3))
+                expected_family = AF_INET;
+        else if (se->se_callback_netid_len == 4 &&
+                 !memcmp(se->se_callback_netid_val, "tcp6", 4))
+                expected_family = AF_INET6;
+        else
                 goto out_err;
 
-        if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
-                         &cb->cb_addr, &cb->cb_port)))
+        cb->cb_addrlen = rpc_uaddr2sockaddr(se->se_callback_addr_val,
+                                            se->se_callback_addr_len,
+                                            (struct sockaddr *) &cb->cb_addr,
+                                            sizeof(cb->cb_addr));
+
+        if (!cb->cb_addrlen || cb->cb_addr.ss_family != expected_family)
                 goto out_err;
+
+        if (cb->cb_addr.ss_family == AF_INET6)
+                ((struct sockaddr_in6 *) &cb->cb_addr)->sin6_scope_id = scopeid;
+
         cb->cb_minorversion = 0;
         cb->cb_prog = se->se_callback_prog;
         cb->cb_ident = se->se_callback_ident;
         return;
 out_err:
+        cb->cb_addr.ss_family = AF_UNSPEC;
+        cb->cb_addrlen = 0;
         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
                 "will not receive delegations\n",
                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
@@ -996,175 +1009,87 @@ out_err:
         return;
 }
 
-void
-nfsd4_set_statp(struct svc_rqst *rqstp, __be32 *statp)
-{
-        struct nfsd4_compoundres *resp = rqstp->rq_resp;
-
-        resp->cstate.statp = statp;
-}
-
 /*
- * Dereference the result pages.
+ * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
  */
-static void
-nfsd4_release_respages(struct page **respages, short resused)
+void
+nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
 {
-        int i;
+        struct nfsd4_slot *slot = resp->cstate.slot;
+        unsigned int base;
 
-        dprintk("--> %s\n", __func__);
-        for (i = 0; i < resused; i++) {
-                if (!respages[i])
-                        continue;
-                put_page(respages[i]);
-                respages[i] = NULL;
-        }
-}
+        dprintk("--> %s slot %p\n", __func__, slot);
 
-static void
-nfsd4_copy_pages(struct page **topages, struct page **frompages, short count)
-{
-        int i;
+        slot->sl_opcnt = resp->opcnt;
+        slot->sl_status = resp->cstate.status;
 
-        for (i = 0; i < count; i++) {
-                topages[i] = frompages[i];
-                if (!topages[i])
-                        continue;
-                get_page(topages[i]);
+        if (nfsd4_not_cached(resp)) {
+                slot->sl_datalen = 0;
+                return;
         }
+        slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
+        base = (char *)resp->cstate.datap -
+                                        (char *)resp->xbuf->head[0].iov_base;
+        if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
+                                    slot->sl_datalen))
+                WARN("%s: sessions DRC could not cache compound\n", __func__);
+        return;
 }
 
 /*
- * Cache the reply pages up to NFSD_PAGES_PER_SLOT + 1, clearing the previous
- * pages. We add a page to NFSD_PAGES_PER_SLOT for the case where the total
- * length of the XDR response is less than se_fmaxresp_cached
- * (NFSD_PAGES_PER_SLOT * PAGE_SIZE) but the xdr_buf pages is used for a
- * of the reply (e.g. readdir).
+ * Encode the replay sequence operation from the slot values.
+ * If cachethis is FALSE encode the uncached rep error on the next
+ * operation which sets resp->p and increments resp->opcnt for
+ * nfs4svc_encode_compoundres.
  *
- * Store the base and length of the rq_req.head[0] page
- * of the NFSv4.1 data, just past the rpc header.
  */
-void
-nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
+static __be32
+nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
+                          struct nfsd4_compoundres *resp)
 {
-        struct nfsd4_cache_entry *entry = &resp->cstate.slot->sl_cache_entry;
-        struct svc_rqst *rqstp = resp->rqstp;
-        struct nfsd4_compoundargs *args = rqstp->rq_argp;
-        struct nfsd4_op *op = &args->ops[resp->opcnt];
-        struct kvec *resv = &rqstp->rq_res.head[0];
-
-        dprintk("--> %s entry %p\n", __func__, entry);
-
-        /* Don't cache a failed OP_SEQUENCE. */
-        if (resp->opcnt == 1 && op->opnum == OP_SEQUENCE && resp->cstate.status)
-                return;
+        struct nfsd4_op *op;
+        struct nfsd4_slot *slot = resp->cstate.slot;
 
-        nfsd4_release_respages(entry->ce_respages, entry->ce_resused);
-        entry->ce_opcnt = resp->opcnt;
-        entry->ce_status = resp->cstate.status;
+        dprintk("--> %s resp->opcnt %d cachethis %u \n", __func__,
+                resp->opcnt, resp->cstate.slot->sl_cachethis);
 
-        /*
-         * Don't need a page to cache just the sequence operation - the slot
-         * does this for us!
-         */
+        /* Encode the replayed sequence operation */
+        op = &args->ops[resp->opcnt - 1];
+        nfsd4_encode_operation(resp, op);
 
-        if (nfsd4_not_cached(resp)) {
-                entry->ce_resused = 0;
-                entry->ce_rpchdrlen = 0;
-                dprintk("%s Just cache SEQUENCE. ce_cachethis %d\n", __func__,
-                        resp->cstate.slot->sl_cache_entry.ce_cachethis);
-                return;
-        }
-        entry->ce_resused = rqstp->rq_resused;
-        if (entry->ce_resused > NFSD_PAGES_PER_SLOT + 1)
-                entry->ce_resused = NFSD_PAGES_PER_SLOT + 1;
-        nfsd4_copy_pages(entry->ce_respages, rqstp->rq_respages,
-                         entry->ce_resused);
-        entry->ce_datav.iov_base = resp->cstate.statp;
-        entry->ce_datav.iov_len = resv->iov_len - ((char *)resp->cstate.statp -
-                                (char *)page_address(rqstp->rq_respages[0]));
-        /* Current request rpc header length*/
-        entry->ce_rpchdrlen = (char *)resp->cstate.statp -
-                                (char *)page_address(rqstp->rq_respages[0]);
-}
-
-/*
- * We keep the rpc header, but take the nfs reply from the replycache.
- */
-static int
-nfsd41_copy_replay_data(struct nfsd4_compoundres *resp,
-                        struct nfsd4_cache_entry *entry)
-{
-        struct svc_rqst *rqstp = resp->rqstp;
-        struct kvec *resv = &resp->rqstp->rq_res.head[0];
-        int len;
-
-        /* Current request rpc header length*/
-        len = (char *)resp->cstate.statp -
-                        (char *)page_address(rqstp->rq_respages[0]);
-        if (entry->ce_datav.iov_len + len > PAGE_SIZE) {
-                dprintk("%s v41 cached reply too large (%Zd).\n", __func__,
-                        entry->ce_datav.iov_len);
-                return 0;
+        /* Return nfserr_retry_uncached_rep in next operation. */
+        if (args->opcnt > 1 && slot->sl_cachethis == 0) {
+                op = &args->ops[resp->opcnt++];
+                op->status = nfserr_retry_uncached_rep;
+                nfsd4_encode_operation(resp, op);
         }
-        /* copy the cached reply nfsd data past the current rpc header */
-        memcpy((char *)resv->iov_base + len, entry->ce_datav.iov_base,
-                entry->ce_datav.iov_len);
-        resv->iov_len = len + entry->ce_datav.iov_len;
-        return 1;
+        return op->status;
 }
 
 /*
- * Keep the first page of the replay. Copy the NFSv4.1 data from the first
- * cached page.  Replace any futher replay pages from the cache.
+ * The sequence operation is not cached because we can use the slot and
+ * session values.
  */
 __be32
 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
                          struct nfsd4_sequence *seq)
 {
-        struct nfsd4_cache_entry *entry = &resp->cstate.slot->sl_cache_entry;
+        struct nfsd4_slot *slot = resp->cstate.slot;
         __be32 status;
 
-        dprintk("--> %s entry %p\n", __func__, entry);
-
-        /*
-         * If this is just the sequence operation, we did not keep
-         * a page in the cache entry because we can just use the
-         * slot info stored in struct nfsd4_sequence that was checked
-         * against the slot in nfsd4_sequence().
-         *
-         * This occurs when seq->cachethis is FALSE, or when the client
-         * session inactivity timer fires and a solo sequence operation
-         * is sent (lease renewal).
-         */
-        if (seq && nfsd4_not_cached(resp)) {
-                seq->maxslots = resp->cstate.session->se_fchannel.maxreqs;
-                return nfs_ok;
-        }
-
-        if (!nfsd41_copy_replay_data(resp, entry)) {
-                /*
-                 * Not enough room to use the replay rpc header, send the
-                 * cached header. Release all the allocated result pages.
-                 */
-                svc_free_res_pages(resp->rqstp);
-                nfsd4_copy_pages(resp->rqstp->rq_respages, entry->ce_respages,
-                        entry->ce_resused);
-        } else {
-                /* Release all but the first allocated result page */
+        dprintk("--> %s slot %p\n", __func__, slot);
 
-                resp->rqstp->rq_resused--;
-                svc_free_res_pages(resp->rqstp);
+        /* Either returns 0 or nfserr_retry_uncached */
+        status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
+        if (status == nfserr_retry_uncached_rep)
+                return status;
 
-                nfsd4_copy_pages(&resp->rqstp->rq_respages[1],
-                                 &entry->ce_respages[1],
-                                 entry->ce_resused - 1);
-        }
+        /* The sequence operation has been encoded, cstate->datap set. */
+        memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
 
-        resp->rqstp->rq_resused = entry->ce_resused;
-        resp->opcnt = entry->ce_opcnt;
-        resp->cstate.iovlen = entry->ce_datav.iov_len + entry->ce_rpchdrlen;
-        status = entry->ce_status;
+        resp->opcnt = slot->sl_opcnt;
+        resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
+        status = slot->sl_status;
 
         return status;
 }
@@ -1194,13 +1119,15 @@ nfsd4_exchange_id(struct svc_rqst *rqstp,
         int status;
         unsigned int            strhashval;
         char                    dname[HEXDIR_LEN];
+        char                    addr_str[INET6_ADDRSTRLEN];
         nfs4_verifier           verf = exid->verifier;
-        u32                     ip_addr = svc_addr_in(rqstp)->sin_addr.s_addr;
+        struct sockaddr         *sa = svc_addr(rqstp);
 
+        rpc_ntop(sa, addr_str, sizeof(addr_str));
         dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
-                " ip_addr=%u flags %x, spa_how %d\n",
+                "ip_addr=%s flags %x, spa_how %d\n",
                 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
-                ip_addr, exid->flags, exid->spa_how);
+                addr_str, exid->flags, exid->spa_how);
 
         if (!check_name(exid->clname) || (exid->flags & ~EXCHGID4_FLAG_MASK_A))
                 return nfserr_inval;
@@ -1281,28 +1208,23 @@ nfsd4_exchange_id(struct svc_rqst *rqstp,
 
 out_new:
         /* Normal case */
-        new = create_client(exid->clname, dname);
+        new = create_client(exid->clname, dname, rqstp, &verf);
         if (new == NULL) {
-                status = nfserr_resource;
+                status = nfserr_serverfault;
                 goto out;
         }
 
-        copy_verf(new, &verf);
-        copy_cred(&new->cl_cred, &rqstp->rq_cred);
-        new->cl_addr = ip_addr;
         gen_clid(new);
-        gen_confirm(new);
         add_to_unconfirmed(new, strhashval);
 out_copy:
         exid->clientid.cl_boot = new->cl_clientid.cl_boot;
         exid->clientid.cl_id = new->cl_clientid.cl_id;
 
-        new->cl_slot.sl_seqid = 0;
         exid->seqid = 1;
         nfsd4_set_ex_flags(new, exid);
 
         dprintk("nfsd4_exchange_id seqid %d flags %x\n",
-                new->cl_slot.sl_seqid, new->cl_exchange_flags);
+                new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
         status = nfs_ok;
 
 out:
@@ -1313,40 +1235,60 @@ error:
 }
 
 static int
-check_slot_seqid(u32 seqid, struct nfsd4_slot *slot)
+check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
 {
-        dprintk("%s enter. seqid %d slot->sl_seqid %d\n", __func__, seqid,
-                slot->sl_seqid);
+        dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
+                slot_seqid);
 
         /* The slot is in use, and no response has been sent. */
-        if (slot->sl_inuse) {
-                if (seqid == slot->sl_seqid)
+        if (slot_inuse) {
+                if (seqid == slot_seqid)
                         return nfserr_jukebox;
                 else
                         return nfserr_seq_misordered;
         }
         /* Normal */
-        if (likely(seqid == slot->sl_seqid + 1))
+        if (likely(seqid == slot_seqid + 1))
                 return nfs_ok;
         /* Replay */
-        if (seqid == slot->sl_seqid)
+        if (seqid == slot_seqid)
                 return nfserr_replay_cache;
         /* Wraparound */
-        if (seqid == 1 && (slot->sl_seqid + 1) == 0)
+        if (seqid == 1 && (slot_seqid + 1) == 0)
                 return nfs_ok;
         /* Misordered replay or misordered new request */
         return nfserr_seq_misordered;
 }
 
+/*
+ * Cache the create session result into the create session single DRC
+ * slot cache by saving the xdr structure. sl_seqid has been set.
+ * Do this for solo or embedded create session operations.
+ */
+static void
+nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
+                           struct nfsd4_clid_slot *slot, int nfserr)
+{
+        slot->sl_status = nfserr;
+        memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
+}
+
+static __be32
+nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
+                            struct nfsd4_clid_slot *slot)
+{
+        memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
+        return slot->sl_status;
+}
+
 __be32
 nfsd4_create_session(struct svc_rqst *rqstp,
                      struct nfsd4_compound_state *cstate,
                      struct nfsd4_create_session *cr_ses)
 {
-        u32 ip_addr = svc_addr_in(rqstp)->sin_addr.s_addr;
-        struct nfsd4_compoundres *resp = rqstp->rq_resp;
+        struct sockaddr *sa = svc_addr(rqstp);
         struct nfs4_client *conf, *unconf;
-        struct nfsd4_slot *slot = NULL;
+        struct nfsd4_clid_slot *cs_slot = NULL;
         int status = 0;
 
         nfs4_lock_state();
@@ -1354,40 +1296,38 @@ nfsd4_create_session(struct svc_rqst *rqstp,
         conf = find_confirmed_client(&cr_ses->clientid);
 
         if (conf) {
-                slot = &conf->cl_slot;
-                status = check_slot_seqid(cr_ses->seqid, slot);
+                cs_slot = &conf->cl_cs_slot;
+                status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
                 if (status == nfserr_replay_cache) {
                         dprintk("Got a create_session replay! seqid= %d\n",
-                                slot->sl_seqid);
-                        cstate->slot = slot;
-                        cstate->status = status;
+                                cs_slot->sl_seqid);
                         /* Return the cached reply status */
-                        status = nfsd4_replay_cache_entry(resp, NULL);
+                        status = nfsd4_replay_create_session(cr_ses, cs_slot);
                         goto out;
-                } else if (cr_ses->seqid != conf->cl_slot.sl_seqid + 1) {
+                } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
                         status = nfserr_seq_misordered;
                         dprintk("Sequence misordered!\n");
                         dprintk("Expected seqid= %d but got seqid= %d\n",
-                                slot->sl_seqid, cr_ses->seqid);
+                                cs_slot->sl_seqid, cr_ses->seqid);
                         goto out;
                 }
-                conf->cl_slot.sl_seqid++;
+                cs_slot->sl_seqid++;
         } else if (unconf) {
                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
-                    (ip_addr != unconf->cl_addr)) {
+                    !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
                         status = nfserr_clid_inuse;
                         goto out;
                 }
 
-                slot = &unconf->cl_slot;
-                status = check_slot_seqid(cr_ses->seqid, slot);
+                cs_slot = &unconf->cl_cs_slot;
+                status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
                 if (status) {
                         /* an unconfirmed replay returns misordered */
                         status = nfserr_seq_misordered;
-                        goto out;
+                        goto out_cache;
                 }
 
-                slot->sl_seqid++; /* from 0 to 1 */
+                cs_slot->sl_seqid++; /* from 0 to 1 */
                 move_to_confirmed(unconf);
 
                 /*
@@ -1396,6 +1336,19 @@ nfsd4_create_session(struct svc_rqst *rqstp,
                 cr_ses->flags &= ~SESSION4_PERSIST;
                 cr_ses->flags &= ~SESSION4_RDMA;
 
+                if (cr_ses->flags & SESSION4_BACK_CHAN) {
+                        unconf->cl_cb_xprt = rqstp->rq_xprt;
+                        svc_xprt_get(unconf->cl_cb_xprt);
+                        rpc_copy_addr(
+                                (struct sockaddr *)&unconf->cl_cb_conn.cb_addr,
+                                sa);
+                        unconf->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
+                        unconf->cl_cb_conn.cb_minorversion =
+                                cstate->minorversion;
+                        unconf->cl_cb_conn.cb_prog = cr_ses->callback_prog;
+                        unconf->cl_cb_seq_nr = 1;
+                        nfsd4_probe_callback(unconf);
+                }
                 conf = unconf;
         } else {
                 status = nfserr_stale_clientid;
@@ -1408,12 +1361,11 @@ nfsd4_create_session(struct svc_rqst *rqstp,
 
         memcpy(cr_ses->sessionid.data, conf->cl_sessionid.data,
                NFS4_MAX_SESSIONID_LEN);
-        cr_ses->seqid = slot->sl_seqid;
+        cr_ses->seqid = cs_slot->sl_seqid;
 
-        slot->sl_inuse = true;
-        cstate->slot = slot;
-        /* Ensure a page is used for the cache */
-        slot->sl_cache_entry.ce_cachethis = 1;
+out_cache:
+        /* cache solo and embedded create sessions under the state lock */
+        nfsd4_cache_create_session(cr_ses, cs_slot, status);
 out:
         nfs4_unlock_state();
         dprintk("%s returns %d\n", __func__, ntohl(status));
@@ -1478,18 +1430,23 @@ nfsd4_sequence(struct svc_rqst *rqstp,
         if (seq->slotid >= session->se_fchannel.maxreqs)
                 goto out;
 
-        slot = &session->se_slots[seq->slotid];
+        slot = session->se_slots[seq->slotid];
         dprintk("%s: slotid %d\n", __func__, seq->slotid);
 
-        status = check_slot_seqid(seq->seqid, slot);
+        /* We do not negotiate the number of slots yet, so set the
+         * maxslots to the session maxreqs which is used to encode
+         * sr_highest_slotid and the sr_target_slot id to maxslots */
+        seq->maxslots = session->se_fchannel.maxreqs;
+
+        status = check_slot_seqid(seq->seqid, slot->sl_seqid, slot->sl_inuse);
         if (status == nfserr_replay_cache) {
                 cstate->slot = slot;
                 cstate->session = session;
                 /* Return the cached reply status and set cstate->status
-                 * for nfsd4_svc_encode_compoundres processing */
+                 * for nfsd4_proc_compound processing */
                 status = nfsd4_replay_cache_entry(resp, seq);
                 cstate->status = nfserr_replay_cache;
-                goto replay_cache;
+                goto out;
         }
         if (status)
                 goto out;
@@ -1497,23 +1454,23 @@ nfsd4_sequence(struct svc_rqst *rqstp,
         /* Success! bump slot seqid */
         slot->sl_inuse = true;
         slot->sl_seqid = seq->seqid;
-        slot->sl_cache_entry.ce_cachethis = seq->cachethis;
-        /* Always set the cache entry cachethis for solo sequence */
-        if (nfsd4_is_solo_sequence(resp))
-                slot->sl_cache_entry.ce_cachethis = 1;
+        slot->sl_cachethis = seq->cachethis;
 
         cstate->slot = slot;
         cstate->session = session;
 
-replay_cache:
-        /* Renew the clientid on success and on replay.
-         * Hold a session reference until done processing the compound:
+        /* Hold a session reference until done processing the compound:
          * nfsd4_put_session called only if the cstate slot is set.
          */
-        renew_client(session->se_client);
         nfsd4_get_session(session);
 out:
         spin_unlock(&sessionid_lock);
+        /* Renew the clientid on success and on replay */
+        if (cstate->session) {
+                nfs4_lock_state();
+                renew_client(session->se_client);
+                nfs4_unlock_state();
+        }
         dprintk("%s: return %d\n", __func__, ntohl(status));
         return status;
 }
@@ -1522,7 +1479,7 @@ __be32
 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
                   struct nfsd4_setclientid *setclid)
 {
-        struct sockaddr_in      *sin = svc_addr_in(rqstp);
+        struct sockaddr         *sa = svc_addr(rqstp);
         struct xdr_netobj       clname = { 
                 .len = setclid->se_namelen,
                 .data = setclid->se_name,
@@ -1531,7 +1488,6 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
         unsigned int            strhashval;
         struct nfs4_client      *conf, *unconf, *new;
         __be32                  status;
-        char                    *princ;
         char                    dname[HEXDIR_LEN];
         
         if (!check_name(clname))
@@ -1554,8 +1510,11 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
                 /* RFC 3530 14.2.33 CASE 0: */
                 status = nfserr_clid_inuse;
                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
-                        dprintk("NFSD: setclientid: string in use by client"
-                                " at %pI4\n", &conf->cl_addr);
+                        char addr_str[INET6_ADDRSTRLEN];
+                        rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
+                                 sizeof(addr_str));
+                        dprintk("NFSD: setclientid: string in use by client "
+                                "at %s\n", addr_str);
                         goto out;
                 }
         }
@@ -1573,7 +1532,7 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
                  */
                 if (unconf)
                         expire_client(unconf);
-                new = create_client(clname, dname);
+                new = create_client(clname, dname, rqstp, &clverifier);
                 if (new == NULL)
                         goto out;
                 gen_clid(new);
@@ -1590,7 +1549,7 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
                          */
                         expire_client(unconf);
                 }
-                new = create_client(clname, dname);
+                new = create_client(clname, dname, rqstp, &clverifier);
                 if (new == NULL)
                         goto out;
                 copy_clid(new, conf);
@@ -1600,7 +1559,7 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
                  * probable client reboot; state will be removed if
                  * confirmed.
                  */
-                new = create_client(clname, dname);
+                new = create_client(clname, dname, rqstp, &clverifier);
                 if (new == NULL)
                         goto out;
                 gen_clid(new);
@@ -1611,25 +1570,12 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
                  * confirmed.
                  */
                 expire_client(unconf);
-                new = create_client(clname, dname);
+                new = create_client(clname, dname, rqstp, &clverifier);
                 if (new == NULL)
                         goto out;
                 gen_clid(new);
         }
-        copy_verf(new, &clverifier);
-        new->cl_addr = sin->sin_addr.s_addr;
-        new->cl_flavor = rqstp->rq_flavor;
-        princ = svc_gss_principal(rqstp);
-        if (princ) {
-                new->cl_principal = kstrdup(princ, GFP_KERNEL);
-                if (new->cl_principal == NULL) {
-                        free_client(new);
-                        goto out;
-                }
-        }
-        copy_cred(&new->cl_cred, &rqstp->rq_cred);
-        gen_confirm(new);
-        gen_callback(new, setclid);
+        gen_callback(new, setclid, rpc_get_scope_id(sa));
         add_to_unconfirmed(new, strhashval);
         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
@@ -1651,7 +1597,7 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
                          struct nfsd4_compound_state *cstate,
                          struct nfsd4_setclientid_confirm *setclientid_confirm)
 {
-        struct sockaddr_in *sin = svc_addr_in(rqstp);
+        struct sockaddr *sa = svc_addr(rqstp);
         struct nfs4_client *conf, *unconf;
         nfs4_verifier confirm = setclientid_confirm->sc_confirm; 
         clientid_t * clid = &setclientid_confirm->sc_clientid;
@@ -1670,9 +1616,9 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
         unconf = find_unconfirmed_client(clid);
 
         status = nfserr_clid_inuse;
-        if (conf && conf->cl_addr != sin->sin_addr.s_addr)
+        if (conf && !rpc_cmp_addr((struct sockaddr *) &conf->cl_addr, sa))
                 goto out;
-        if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
+        if (unconf && !rpc_cmp_addr((struct sockaddr *) &unconf->cl_addr, sa))
                 goto out;
 
         /*
@@ -2163,7 +2109,7 @@ int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
                 return -EAGAIN;
 }
 
-static struct lock_manager_operations nfsd_lease_mng_ops = {
+static const struct lock_manager_operations nfsd_lease_mng_ops = {
         .fl_break = nfsd_break_deleg_cb,
         .fl_release_private = nfsd_release_deleg_cb,
         .fl_copy_lock = nfsd_copy_lock_deleg_cb,
@@ -3368,7 +3314,7 @@ nfs4_transform_lock_offset(struct file_lock *lock)
 
 /* Hack!: For now, we're defining this just so we can use a pointer to it
  * as a unique cookie to identify our (NFSv4's) posix locks. */
-static struct lock_manager_operations nfsd_posix_mng_ops  = {
+static const struct lock_manager_operations nfsd_posix_mng_ops  = {
 };
 
 static inline void
@@ -4072,7 +4018,7 @@ set_max_delegations(void)
 
 /* initialization to perform when the nfsd service is started: */
 
-static void
+static int
 __nfs4_state_start(void)
 {
         unsigned long grace_time;
@@ -4084,19 +4030,26 @@ __nfs4_state_start(void)
         printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
                grace_time/HZ);
         laundry_wq = create_singlethread_workqueue("nfsd4");
+        if (laundry_wq == NULL)
+                return -ENOMEM;
         queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
         set_max_delegations();
+        return set_callback_cred();
 }
 
-void
+int
 nfs4_state_start(void)
 {
+        int ret;
+
         if (nfs4_init)
-                return;
+                return 0;
         nfsd4_load_reboot_recovery_data();
-        __nfs4_state_start();
+        ret = __nfs4_state_start();
+        if (ret)
+                return ret;
         nfs4_init = 1;
-        return;
+        return 0;
 }
 
 time_t
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 2dcc7feaa6ff..0fbd50cee1f6 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1599,7 +1599,8 @@ static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
 {
         struct svc_fh tmp_fh;
-        char *path, *rootpath;
+        char *path = NULL, *rootpath;
+        size_t rootlen;
 
         fh_init(&tmp_fh, NFS4_FHSIZE);
         *stat = exp_pseudoroot(rqstp, &tmp_fh);
@@ -1609,14 +1610,18 @@ static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *
 
         path = exp->ex_pathname;
 
-        if (strncmp(path, rootpath, strlen(rootpath))) {
+        rootlen = strlen(rootpath);
+        if (strncmp(path, rootpath, rootlen)) {
                 dprintk("nfsd: fs_locations failed;"
                         "%s is not contained in %s\n", path, rootpath);
                 *stat = nfserr_notsupp;
-                return NULL;
+                path = NULL;
+                goto out;
         }
-
-        return path + strlen(rootpath);
+        path += rootlen;
+out:
+        fh_put(&tmp_fh);
+        return path;
 }
 
 /*
@@ -1793,11 +1798,6 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
                                 goto out_nfserr;
                 }
         }
-        if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
-                if (exp->ex_fslocs.locations == NULL) {
-                        bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
-                }
-        }
         if ((buflen -= 16) < 0)
                 goto out_resource;
 
@@ -1825,8 +1825,6 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
                         goto out_resource;
                 if (!aclsupport)
                         word0 &= ~FATTR4_WORD0_ACL;
-                if (!exp->ex_fslocs.locations)
-                        word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
                 if (!word2) {
                         WRITE32(2);
                         WRITE32(word0);
@@ -3064,6 +3062,7 @@ nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
         WRITE32(0);
 
         ADJUST_ARGS();
+        resp->cstate.datap = p; /* DRC cache data pointer */
         return 0;
 }
 
@@ -3166,7 +3165,7 @@ static int nfsd4_check_drc_limit(struct nfsd4_compoundres *resp)
                 return status;
 
         session = resp->cstate.session;
-        if (session == NULL || slot->sl_cache_entry.ce_cachethis == 0)
+        if (session == NULL || slot->sl_cachethis == 0)
                 return status;
 
         if (resp->opcnt >= args->opcnt)
@@ -3291,6 +3290,7 @@ nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compo
         /*
          * All that remains is to write the tag and operation count...
          */
+        struct nfsd4_compound_state *cs = &resp->cstate;
         struct kvec *iov;
         p = resp->tagp;
         *p++ = htonl(resp->taglen);
@@ -3304,17 +3304,11 @@ nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compo
                 iov = &rqstp->rq_res.head[0];
         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
         BUG_ON(iov->iov_len > PAGE_SIZE);
-        if (nfsd4_has_session(&resp->cstate)) {
-                if (resp->cstate.status == nfserr_replay_cache &&
-                                !nfsd4_not_cached(resp)) {
-                        iov->iov_len = resp->cstate.iovlen;
-                } else {
-                        nfsd4_store_cache_entry(resp);
-                        dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
-                        resp->cstate.slot->sl_inuse = 0;
-                }
-                if (resp->cstate.session)
-                        nfsd4_put_session(resp->cstate.session);
+        if (nfsd4_has_session(cs) && cs->status != nfserr_replay_cache) {
+                nfsd4_store_cache_entry(resp);
+                dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
+                resp->cstate.slot->sl_inuse = false;
+                nfsd4_put_session(resp->cstate.session);
         }
         return 1;
 }
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 7e906c5b7671..5c01fc148ce8 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -174,12 +174,13 @@ static const struct file_operations exports_operations = {
 };
 
 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
+extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
 
-static struct file_operations pool_stats_operations = {
+static const struct file_operations pool_stats_operations = {
         .open           = nfsd_pool_stats_open,
         .read           = seq_read,
         .llseek         = seq_lseek,
-        .release        = seq_release,
+        .release        = nfsd_pool_stats_release,
         .owner          = THIS_MODULE,
 };
 
@@ -776,10 +777,7 @@ static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
                 size -= len;
                 mesg += len;
         }
-
-        mutex_unlock(&nfsd_mutex);
-        return (mesg-buf);
-
+        rv = mesg - buf;
 out_free:
         kfree(nthreads);
         mutex_unlock(&nfsd_mutex);
diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
index 8847f3fbfc1e..01965b2f3a76 100644
--- a/fs/nfsd/nfsfh.c
+++ b/fs/nfsd/nfsfh.c
@@ -397,44 +397,51 @@ static inline void _fh_update_old(struct dentry *dentry,
                 fh->ofh_dirino = 0;
 }
 
-__be32
-fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
-           struct svc_fh *ref_fh)
+static bool is_root_export(struct svc_export *exp)
 {
-        /* ref_fh is a reference file handle.
-         * if it is non-null and for the same filesystem, then we should compose
-         * a filehandle which is of the same version, where possible.
-         * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca
-         * Then create a 32byte filehandle using nfs_fhbase_old
-         *
-         */
+        return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root;
+}
 
-        u8 version;
-        u8 fsid_type = 0;
-        struct inode * inode = dentry->d_inode;
-        struct dentry *parent = dentry->d_parent;
-        __u32 *datap;
-        dev_t ex_dev = exp->ex_path.dentry->d_inode->i_sb->s_dev;
-        int root_export = (exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root);
+static struct super_block *exp_sb(struct svc_export *exp)
+{
+        return exp->ex_path.dentry->d_inode->i_sb;
+}
 
-        dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n",
-                MAJOR(ex_dev), MINOR(ex_dev),
-                (long) exp->ex_path.dentry->d_inode->i_ino,
-                parent->d_name.name, dentry->d_name.name,
-                (inode ? inode->i_ino : 0));
+static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp)
+{
+        switch (fsid_type) {
+        case FSID_DEV:
+                if (!old_valid_dev(exp_sb(exp)->s_dev))
+                        return 0;
+                /* FALL THROUGH */
+        case FSID_MAJOR_MINOR:
+        case FSID_ENCODE_DEV:
+                return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV;
+        case FSID_NUM:
+                return exp->ex_flags & NFSEXP_FSID;
+        case FSID_UUID8:
+        case FSID_UUID16:
+                if (!is_root_export(exp))
+                        return 0;
+                /* fall through */
+        case FSID_UUID4_INUM:
+        case FSID_UUID16_INUM:
+                return exp->ex_uuid != NULL;
+        }
+        return 1;
+}
 
-        /* Choose filehandle version and fsid type based on
-         * the reference filehandle (if it is in the same export)
-         * or the export options.
-         */
- retry:
+
+static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh)
+{
+        u8 version;
+        u8 fsid_type;
+retry:
         version = 1;
         if (ref_fh && ref_fh->fh_export == exp) {
                 version = ref_fh->fh_handle.fh_version;
                 fsid_type = ref_fh->fh_handle.fh_fsid_type;
 
-                if (ref_fh == fhp)
-                        fh_put(ref_fh);
                 ref_fh = NULL;
 
                 switch (version) {
@@ -447,58 +454,66 @@ fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
                         goto retry;
                 }
 
-                /* Need to check that this type works for this
-                 * export point.  As the fsid -> filesystem mapping
-                 * was guided by user-space, there is no guarantee
-                 * that the filesystem actually supports that fsid
-                 * type. If it doesn't we loop around again without
-                 * ref_fh set.
+                /*
+                 * As the fsid -> filesystem mapping was guided by
+                 * user-space, there is no guarantee that the filesystem
+                 * actually supports that fsid type. If it doesn't we
+                 * loop around again without ref_fh set.
                  */
-                switch(fsid_type) {
-                case FSID_DEV:
-                        if (!old_valid_dev(ex_dev))
-                                goto retry;
-                        /* FALL THROUGH */
-                case FSID_MAJOR_MINOR:
-                case FSID_ENCODE_DEV:
-                        if (!(exp->ex_path.dentry->d_inode->i_sb->s_type->fs_flags
-                              & FS_REQUIRES_DEV))
-                                goto retry;
-                        break;
-                case FSID_NUM:
-                        if (! (exp->ex_flags & NFSEXP_FSID))
-                                goto retry;
-                        break;
-                case FSID_UUID8:
-                case FSID_UUID16:
-                        if (!root_export)
-                                goto retry;
-                        /* fall through */
-                case FSID_UUID4_INUM:
-                case FSID_UUID16_INUM:
-                        if (exp->ex_uuid == NULL)
-                                goto retry;
-                        break;
-                }
+                if (!fsid_type_ok_for_exp(fsid_type, exp))
+                        goto retry;
         } else if (exp->ex_flags & NFSEXP_FSID) {
                 fsid_type = FSID_NUM;
         } else if (exp->ex_uuid) {
                 if (fhp->fh_maxsize >= 64) {
-                        if (root_export)
+                        if (is_root_export(exp))
                                 fsid_type = FSID_UUID16;
                         else
                                 fsid_type = FSID_UUID16_INUM;
                 } else {
-                        if (root_export)
+                        if (is_root_export(exp))
                                 fsid_type = FSID_UUID8;
                         else
                                 fsid_type = FSID_UUID4_INUM;
                 }
-        } else if (!old_valid_dev(ex_dev))
+        } else if (!old_valid_dev(exp_sb(exp)->s_dev))
                 /* for newer device numbers, we must use a newer fsid format */
                 fsid_type = FSID_ENCODE_DEV;
         else
                 fsid_type = FSID_DEV;
+        fhp->fh_handle.fh_version = version;
+        if (version)
+                fhp->fh_handle.fh_fsid_type = fsid_type;
+}
+
+__be32
+fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
+           struct svc_fh *ref_fh)
+{
+        /* ref_fh is a reference file handle.
+         * if it is non-null and for the same filesystem, then we should compose
+         * a filehandle which is of the same version, where possible.
+         * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca
+         * Then create a 32byte filehandle using nfs_fhbase_old
+         *
+         */
+
+        struct inode * inode = dentry->d_inode;
+        struct dentry *parent = dentry->d_parent;
+        __u32 *datap;
+        dev_t ex_dev = exp_sb(exp)->s_dev;
+
+        dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n",
+                MAJOR(ex_dev), MINOR(ex_dev),
+                (long) exp->ex_path.dentry->d_inode->i_ino,
+                parent->d_name.name, dentry->d_name.name,
+                (inode ? inode->i_ino : 0));
+
+        /* Choose filehandle version and fsid type based on
+         * the reference filehandle (if it is in the same export)
+         * or the export options.
+         */
+         set_version_and_fsid_type(fhp, exp, ref_fh);
 
         if (ref_fh == fhp)
                 fh_put(ref_fh);
@@ -516,7 +531,7 @@ fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
         fhp->fh_export = exp;
         cache_get(&exp->h);
 
-        if (version == 0xca) {
+        if (fhp->fh_handle.fh_version == 0xca) {
                 /* old style filehandle please */
                 memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE);
                 fhp->fh_handle.fh_size = NFS_FHSIZE;
@@ -530,22 +545,22 @@ fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
                         _fh_update_old(dentry, exp, &fhp->fh_handle);
         } else {
                 int len;
-                fhp->fh_handle.fh_version = 1;
                 fhp->fh_handle.fh_auth_type = 0;
                 datap = fhp->fh_handle.fh_auth+0;
-                fhp->fh_handle.fh_fsid_type = fsid_type;
-                mk_fsid(fsid_type, datap, ex_dev,
+                mk_fsid(fhp->fh_handle.fh_fsid_type, datap, ex_dev,
                         exp->ex_path.dentry->d_inode->i_ino,
                         exp->ex_fsid, exp->ex_uuid);
 
-                len = key_len(fsid_type);
+                len = key_len(fhp->fh_handle.fh_fsid_type);
                 datap += len/4;
                 fhp->fh_handle.fh_size = 4 + len;
 
                 if (inode)
                         _fh_update(fhp, exp, dentry);
-                if (fhp->fh_handle.fh_fileid_type == 255)
+                if (fhp->fh_handle.fh_fileid_type == 255) {
+                        fh_put(fhp);
                         return nfserr_opnotsupp;
+                }
         }
 
         return 0;
@@ -639,8 +654,7 @@ enum fsid_source fsid_source(struct svc_fh *fhp)
         case FSID_DEV:
         case FSID_ENCODE_DEV:
         case FSID_MAJOR_MINOR:
-                if (fhp->fh_export->ex_path.dentry->d_inode->i_sb->s_type->fs_flags
-                    & FS_REQUIRES_DEV)
+                if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV)
                         return FSIDSOURCE_DEV;
                 break;
         case FSID_NUM:
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 24d58adfe5fd..67ea83eedd43 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -34,6 +34,7 @@
 #include <linux/nfsd/syscall.h>
 #include <linux/lockd/bind.h>
 #include <linux/nfsacl.h>
+#include <linux/seq_file.h>
 
 #define NFSDDBG_FACILITY        NFSDDBG_SVC
 
@@ -66,6 +67,16 @@ struct timeval			nfssvc_boot;
 DEFINE_MUTEX(nfsd_mutex);
 struct svc_serv                 *nfsd_serv;
 
+/*
+ * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used.
+ * nfsd_drc_max_pages limits the total amount of memory available for
+ * version 4.1 DRC caches.
+ * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage.
+ */
+spinlock_t      nfsd_drc_lock;
+unsigned int    nfsd_drc_max_mem;
+unsigned int    nfsd_drc_mem_used;
+
 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
 static struct svc_stat  nfsd_acl_svcstats;
 static struct svc_version *     nfsd_acl_version[] = {
@@ -235,13 +246,12 @@ void nfsd_reset_versions(void)
  */
 static void set_max_drc(void)
 {
-        /* The percent of nr_free_buffer_pages used by the V4.1 server DRC */
-        #define NFSD_DRC_SIZE_SHIFT     7
-        nfsd_serv->sv_drc_max_pages = nr_free_buffer_pages()
-                                                >> NFSD_DRC_SIZE_SHIFT;
-        nfsd_serv->sv_drc_pages_used = 0;
-        dprintk("%s svc_drc_max_pages %u\n", __func__,
-                nfsd_serv->sv_drc_max_pages);
+        #define NFSD_DRC_SIZE_SHIFT     10
+        nfsd_drc_max_mem = (nr_free_buffer_pages()
+                                        >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE;
+        nfsd_drc_mem_used = 0;
+        spin_lock_init(&nfsd_drc_lock);
+        dprintk("%s nfsd_drc_max_mem %u \n", __func__, nfsd_drc_max_mem);
 }
 
 int nfsd_create_serv(void)
@@ -401,7 +411,9 @@ nfsd_svc(unsigned short port, int nrservs)
         error = nfsd_racache_init(2*nrservs);
         if (error<0)
                 goto out;
-        nfs4_state_start();
+        error = nfs4_state_start();
+        if (error)
+                goto out;
 
         nfsd_reset_versions();
 
@@ -569,10 +581,6 @@ nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
                 + rqstp->rq_res.head[0].iov_len;
         rqstp->rq_res.head[0].iov_len += sizeof(__be32);
 
-        /* NFSv4.1 DRC requires statp */
-        if (rqstp->rq_vers == 4)
-                nfsd4_set_statp(rqstp, statp);
-
         /* Now call the procedure handler, and encode NFS status. */
         nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
         nfserr = map_new_errors(rqstp->rq_vers, nfserr);
@@ -607,7 +615,25 @@ nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
 
 int nfsd_pool_stats_open(struct inode *inode, struct file *file)
 {
-        if (nfsd_serv == NULL)
+        int ret;
+        mutex_lock(&nfsd_mutex);
+        if (nfsd_serv == NULL) {
+                mutex_unlock(&nfsd_mutex);
                 return -ENODEV;
-        return svc_pool_stats_open(nfsd_serv, file);
+        }
+        /* bump up the psudo refcount while traversing */
+        svc_get(nfsd_serv);
+        ret = svc_pool_stats_open(nfsd_serv, file);
+        mutex_unlock(&nfsd_mutex);
+        return ret;
+}
+
+int nfsd_pool_stats_release(struct inode *inode, struct file *file)
+{
+        int ret = seq_release(inode, file);
+        mutex_lock(&nfsd_mutex);
+        /* this function really, really should have been called svc_put() */
+        svc_destroy(nfsd_serv);
+        mutex_unlock(&nfsd_mutex);
+        return ret;
 }
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 8fa09bfbcba7..a293f0273263 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -89,6 +89,12 @@ struct raparm_hbucket {
 #define RAPARM_HASH_MASK        (RAPARM_HASH_SIZE-1)
 static struct raparm_hbucket    raparm_hash[RAPARM_HASH_SIZE];
 
+static inline int
+nfsd_v4client(struct svc_rqst *rq)
+{
+    return rq->rq_prog == NFS_PROGRAM && rq->rq_vers == 4;
+}
+
 /* 
  * Called from nfsd_lookup and encode_dirent. Check if we have crossed 
  * a mount point.
@@ -115,7 +121,8 @@ nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
                 path_put(&path);
                 goto out;
         }
-        if ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) {
+        if (nfsd_v4client(rqstp) ||
+                (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) {
                 /* successfully crossed mount point */
                 /*
                  * This is subtle: path.dentry is *not* on path.mnt
diff --git a/fs/nilfs2/btnode.c b/fs/nilfs2/btnode.c
index c668bca579c1..5941958f1e47 100644
--- a/fs/nilfs2/btnode.c
+++ b/fs/nilfs2/btnode.c
@@ -36,6 +36,7 @@
 
 void nilfs_btnode_cache_init_once(struct address_space *btnc)
 {
+        memset(btnc, 0, sizeof(*btnc));
         INIT_RADIX_TREE(&btnc->page_tree, GFP_ATOMIC);
         spin_lock_init(&btnc->tree_lock);
         INIT_LIST_HEAD(&btnc->private_list);
@@ -46,7 +47,7 @@ void nilfs_btnode_cache_init_once(struct address_space *btnc)
         INIT_LIST_HEAD(&btnc->i_mmap_nonlinear);
 }
 
-static struct address_space_operations def_btnode_aops = {
+static const struct address_space_operations def_btnode_aops = {
         .sync_page              = block_sync_page,
 };
 
diff --git a/fs/nilfs2/dir.c b/fs/nilfs2/dir.c
index 1a4fa04cf071..e097099bfc8f 100644
--- a/fs/nilfs2/dir.c
+++ b/fs/nilfs2/dir.c
@@ -697,7 +697,7 @@ not_empty:
         return 0;
 }
 
-struct file_operations nilfs_dir_operations = {
+const struct file_operations nilfs_dir_operations = {
         .llseek         = generic_file_llseek,
         .read           = generic_read_dir,
         .readdir        = nilfs_readdir,
diff --git a/fs/nilfs2/file.c b/fs/nilfs2/file.c
index 6bd84a0d8238..30292df443ce 100644
--- a/fs/nilfs2/file.c
+++ b/fs/nilfs2/file.c
@@ -117,7 +117,7 @@ static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
         return 0;
 }
 
-struct vm_operations_struct nilfs_file_vm_ops = {
+static const struct vm_operations_struct nilfs_file_vm_ops = {
         .fault          = filemap_fault,
         .page_mkwrite   = nilfs_page_mkwrite,
 };
@@ -134,7 +134,7 @@ static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
  * We have mostly NULL's here: the current defaults are ok for
  * the nilfs filesystem.
  */
-struct file_operations nilfs_file_operations = {
+const struct file_operations nilfs_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = do_sync_read,
         .write          = do_sync_write,
@@ -151,7 +151,7 @@ struct file_operations nilfs_file_operations = {
         .splice_read    = generic_file_splice_read,
 };
 
-struct inode_operations nilfs_file_inode_operations = {
+const struct inode_operations nilfs_file_inode_operations = {
         .truncate       = nilfs_truncate,
         .setattr        = nilfs_setattr,
         .permission     = nilfs_permission,
diff --git a/fs/nilfs2/gcinode.c b/fs/nilfs2/gcinode.c
index 1b3c2bb20da9..e6de0a27ab5d 100644
--- a/fs/nilfs2/gcinode.c
+++ b/fs/nilfs2/gcinode.c
@@ -52,7 +52,7 @@
 #include "dat.h"
 #include "ifile.h"
 
-static struct address_space_operations def_gcinode_aops = {
+static const struct address_space_operations def_gcinode_aops = {
         .sync_page              = block_sync_page,
 };
 
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index 807e584b163d..5040220c3732 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -238,7 +238,7 @@ nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
         return size;
 }
 
-struct address_space_operations nilfs_aops = {
+const struct address_space_operations nilfs_aops = {
         .writepage              = nilfs_writepage,
         .readpage               = nilfs_readpage,
         .sync_page              = block_sync_page,
@@ -400,6 +400,7 @@ int nilfs_read_inode_common(struct inode *inode,
         ii->i_dir_acl = S_ISREG(inode->i_mode) ?
                 0 : le32_to_cpu(raw_inode->i_dir_acl);
 #endif
+        ii->i_dir_start_lookup = 0;
         ii->i_cno = 0;
         inode->i_generation = le32_to_cpu(raw_inode->i_generation);
 
diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index 156bf6091a96..f6326112d647 100644
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -427,13 +427,13 @@ nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc)
 }
 
 
-static struct address_space_operations def_mdt_aops = {
+static const struct address_space_operations def_mdt_aops = {
         .writepage              = nilfs_mdt_write_page,
         .sync_page              = block_sync_page,
 };
 
-static struct inode_operations def_mdt_iops;
-static struct file_operations def_mdt_fops;
+static const struct inode_operations def_mdt_iops;
+static const struct file_operations def_mdt_fops;
 
 /*
  * NILFS2 uses pseudo inodes for meta data files such as DAT, cpfile, sufile,
diff --git a/fs/nilfs2/namei.c b/fs/nilfs2/namei.c
index df70dadb336f..ed02e886fa79 100644
--- a/fs/nilfs2/namei.c
+++ b/fs/nilfs2/namei.c
@@ -448,7 +448,7 @@ out:
         return err;
 }
 
-struct inode_operations nilfs_dir_inode_operations = {
+const struct inode_operations nilfs_dir_inode_operations = {
         .create         = nilfs_create,
         .lookup         = nilfs_lookup,
         .link           = nilfs_link,
@@ -462,12 +462,12 @@ struct inode_operations nilfs_dir_inode_operations = {
         .permission     = nilfs_permission,
 };
 
-struct inode_operations nilfs_special_inode_operations = {
+const struct inode_operations nilfs_special_inode_operations = {
         .setattr        = nilfs_setattr,
         .permission     = nilfs_permission,
 };
 
-struct inode_operations nilfs_symlink_inode_operations = {
+const struct inode_operations nilfs_symlink_inode_operations = {
         .readlink       = generic_readlink,
         .follow_link    = page_follow_link_light,
         .put_link       = page_put_link,
diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h
index 724c63766e82..4da6f67e9a91 100644
--- a/fs/nilfs2/nilfs.h
+++ b/fs/nilfs2/nilfs.h
@@ -294,13 +294,13 @@ void nilfs_clear_gcdat_inode(struct the_nilfs *);
 /*
  * Inodes and files operations
  */
-extern struct file_operations nilfs_dir_operations;
-extern struct inode_operations nilfs_file_inode_operations;
-extern struct file_operations nilfs_file_operations;
-extern struct address_space_operations nilfs_aops;
-extern struct inode_operations nilfs_dir_inode_operations;
-extern struct inode_operations nilfs_special_inode_operations;
-extern struct inode_operations nilfs_symlink_inode_operations;
+extern const struct file_operations nilfs_dir_operations;
+extern const struct inode_operations nilfs_file_inode_operations;
+extern const struct file_operations nilfs_file_operations;
+extern const struct address_space_operations nilfs_aops;
+extern const struct inode_operations nilfs_dir_inode_operations;
+extern const struct inode_operations nilfs_special_inode_operations;
+extern const struct inode_operations nilfs_symlink_inode_operations;
 
 /*
  * filesystem type
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 55f3d6b60732..644e66727dd0 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -504,7 +504,7 @@ static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
         return 0;
 }
 
-static struct super_operations nilfs_sops = {
+static const struct super_operations nilfs_sops = {
         .alloc_inode    = nilfs_alloc_inode,
         .destroy_inode  = nilfs_destroy_inode,
         .dirty_inode    = nilfs_dirty_inode,
@@ -560,7 +560,7 @@ nilfs_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len,
                                     nilfs_nfs_get_inode);
 }
 
-static struct export_operations nilfs_export_ops = {
+static const struct export_operations nilfs_export_ops = {
         .fh_to_dentry = nilfs_fh_to_dentry,
         .fh_to_parent = nilfs_fh_to_parent,
         .get_parent = nilfs_get_parent,
diff --git a/fs/nls/nls_base.c b/fs/nls/nls_base.c
index 477d37d83b31..44a88a9fa2c8 100644
--- a/fs/nls/nls_base.c
+++ b/fs/nls/nls_base.c
@@ -124,10 +124,10 @@ int utf8s_to_utf16s(const u8 *s, int len, wchar_t *pwcs)
         while (*s && len > 0) {
                 if (*s & 0x80) {
                         size = utf8_to_utf32(s, len, &u);
-                        if (size < 0) {
-                                /* Ignore character and move on */
-                                size = 1;
-                        } else if (u >= PLANE_SIZE) {
+                        if (size < 0)
+                                return -EINVAL;
+
+                        if (u >= PLANE_SIZE) {
                                 u -= PLANE_SIZE;
                                 *op++ = (wchar_t) (SURROGATE_PAIR |
                                                 ((u >> 10) & SURROGATE_BITS));
@@ -270,7 +270,8 @@ struct nls_table *load_nls(char *charset)
 
 void unload_nls(struct nls_table *nls)
 {
-        module_put(nls->owner);
+        if (nls)
+                module_put(nls->owner);
 }
 
 static const wchar_t charset2uni[256] = {
diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c
index b38f944f0667..cfce53cb65d7 100644
--- a/fs/ntfs/aops.c
+++ b/fs/ntfs/aops.c
@@ -1550,6 +1550,7 @@ const struct address_space_operations ntfs_aops = {
         .migratepage    = buffer_migrate_page,  /* Move a page cache page from
                                                    one physical page to an
                                                    other. */
+        .error_remove_page = generic_error_remove_page,
 };
 
 /**
@@ -1569,6 +1570,7 @@ const struct address_space_operations ntfs_mst_aops = {
         .migratepage    = buffer_migrate_page,  /* Move a page cache page from
                                                    one physical page to an
                                                    other. */
+        .error_remove_page = generic_error_remove_page,
 };
 
 #ifdef NTFS_RW
diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c
index 4350d4993b18..663c0e341f8b 100644
--- a/fs/ntfs/file.c
+++ b/fs/ntfs/file.c
@@ -2146,46 +2146,6 @@ static ssize_t ntfs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 }
 
 /**
- * ntfs_file_writev -
- *
- * Basically the same as generic_file_writev() except that it ends up calling
- * ntfs_file_aio_write_nolock() instead of __generic_file_aio_write_nolock().
- */
-static ssize_t ntfs_file_writev(struct file *file, const struct iovec *iov,
-                unsigned long nr_segs, loff_t *ppos)
-{
-        struct address_space *mapping = file->f_mapping;
-        struct inode *inode = mapping->host;
-        struct kiocb kiocb;
-        ssize_t ret;
-
-        mutex_lock(&inode->i_mutex);
-        init_sync_kiocb(&kiocb, file);
-        ret = ntfs_file_aio_write_nolock(&kiocb, iov, nr_segs, ppos);
-        if (ret == -EIOCBQUEUED)
-                ret = wait_on_sync_kiocb(&kiocb);
-        mutex_unlock(&inode->i_mutex);
-        if (ret > 0) {
-                int err = generic_write_sync(file, *ppos - ret, ret);
-                if (err < 0)
-                        ret = err;
-        }
-        return ret;
-}
-
-/**
- * ntfs_file_write - simple wrapper for ntfs_file_writev()
- */
-static ssize_t ntfs_file_write(struct file *file, const char __user *buf,
-                size_t count, loff_t *ppos)
-{
-        struct iovec local_iov = { .iov_base = (void __user *)buf,
-                                   .iov_len = count };
-
-        return ntfs_file_writev(file, &local_iov, 1, ppos);
-}
-
-/**
  * ntfs_file_fsync - sync a file to disk
  * @filp:       file to be synced
  * @dentry:     dentry describing the file to sync
@@ -2247,7 +2207,7 @@ const struct file_operations ntfs_file_ops = {
         .read           = do_sync_read,          /* Read from file. */
         .aio_read       = generic_file_aio_read, /* Async read from file. */
 #ifdef NTFS_RW
-        .write          = ntfs_file_write,       /* Write to file. */
+        .write          = do_sync_write,         /* Write to file. */
         .aio_write      = ntfs_file_aio_write,   /* Async write to file. */
         /*.release      = ,*/                    /* Last file is closed.  See
                                                     fs/ext2/file.c::
diff --git a/fs/ntfs/layout.h b/fs/ntfs/layout.h
index 50931b1ce4b9..8b2549f672bf 100644
--- a/fs/ntfs/layout.h
+++ b/fs/ntfs/layout.h
@@ -829,7 +829,7 @@ enum {
         /* Note, FILE_ATTR_VALID_SET_FLAGS masks out the old DOS VolId, the
            F_A_DEVICE, F_A_DIRECTORY, F_A_SPARSE_FILE, F_A_REPARSE_POINT,
            F_A_COMPRESSED, and F_A_ENCRYPTED and preserves the rest.  This mask
-           is used to to obtain all flags that are valid for setting. */
+           is used to obtain all flags that are valid for setting. */
         /*
          * The flag FILE_ATTR_DUP_FILENAME_INDEX_PRESENT is present in all
          * FILENAME_ATTR attributes but not in the STANDARD_INFORMATION
diff --git a/fs/ntfs/malloc.h b/fs/ntfs/malloc.h
index cd0be3f5c3cd..a44b14cbceeb 100644
--- a/fs/ntfs/malloc.h
+++ b/fs/ntfs/malloc.h
@@ -47,7 +47,7 @@ static inline void *__ntfs_malloc(unsigned long size, gfp_t gfp_mask)
                 return kmalloc(PAGE_SIZE, gfp_mask & ~__GFP_HIGHMEM);
                 /* return (void *)__get_free_page(gfp_mask); */
         }
-        if (likely(size >> PAGE_SHIFT < num_physpages))
+        if (likely((size >> PAGE_SHIFT) < totalram_pages))
                 return __vmalloc(size, gfp_mask, PAGE_KERNEL);
         return NULL;
 }
diff --git a/fs/ntfs/super.c b/fs/ntfs/super.c
index abaaa1cbf8de..80b04770e8e9 100644
--- a/fs/ntfs/super.c
+++ b/fs/ntfs/super.c
@@ -201,8 +201,7 @@ use_utf8:
                                                 v, old_nls->charset);
                                 nls_map = old_nls;
                         } else /* nls_map */ {
-                                if (old_nls)
-                                        unload_nls(old_nls);
+                                unload_nls(old_nls);
                         }
                 } else if (!strcmp(p, "utf8")) {
                         bool val = false;
@@ -2427,10 +2426,9 @@ static void ntfs_put_super(struct super_block *sb)
                 ntfs_free(vol->upcase);
                 vol->upcase = NULL;
         }
-        if (vol->nls_map) {
-                unload_nls(vol->nls_map);
-                vol->nls_map = NULL;
-        }
+
+        unload_nls(vol->nls_map);
+
         sb->s_fs_info = NULL;
         kfree(vol);
 
diff --git a/fs/ocfs2/Makefile b/fs/ocfs2/Makefile
index 01596079dd63..31f25ce32c97 100644
--- a/fs/ocfs2/Makefile
+++ b/fs/ocfs2/Makefile
@@ -28,6 +28,7 @@ ocfs2-objs := \
         locks.o                 \
         mmap.o                  \
         namei.o                 \
+        refcounttree.o          \
         resize.o                \
         slot_map.o              \
         suballoc.o              \
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index ab513ddaeff2..38a42f5d59ff 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -49,10 +49,21 @@
 #include "super.h"
 #include "uptodate.h"
 #include "xattr.h"
+#include "refcounttree.h"
 
 #include "buffer_head_io.h"
 
+enum ocfs2_contig_type {
+        CONTIG_NONE = 0,
+        CONTIG_LEFT,
+        CONTIG_RIGHT,
+        CONTIG_LEFTRIGHT,
+};
 
+static enum ocfs2_contig_type
+        ocfs2_extent_rec_contig(struct super_block *sb,
+                                struct ocfs2_extent_rec *ext,
+                                struct ocfs2_extent_rec *insert_rec);
 /*
  * Operations for a specific extent tree type.
  *
@@ -79,18 +90,30 @@ struct ocfs2_extent_tree_operations {
          * that value.  new_clusters is the delta, and must be
          * added to the total.  Required.
          */
-        void (*eo_update_clusters)(struct inode *inode,
-                                   struct ocfs2_extent_tree *et,
+        void (*eo_update_clusters)(struct ocfs2_extent_tree *et,
                                    u32 new_clusters);
 
         /*
+         * If this extent tree is supported by an extent map, insert
+         * a record into the map.
+         */
+        void (*eo_extent_map_insert)(struct ocfs2_extent_tree *et,
+                                     struct ocfs2_extent_rec *rec);
+
+        /*
+         * If this extent tree is supported by an extent map, truncate the
+         * map to clusters,
+         */
+        void (*eo_extent_map_truncate)(struct ocfs2_extent_tree *et,
+                                       u32 clusters);
+
+        /*
          * If ->eo_insert_check() exists, it is called before rec is
          * inserted into the extent tree.  It is optional.
          */
-        int (*eo_insert_check)(struct inode *inode,
-                               struct ocfs2_extent_tree *et,
+        int (*eo_insert_check)(struct ocfs2_extent_tree *et,
                                struct ocfs2_extent_rec *rec);
-        int (*eo_sanity_check)(struct inode *inode, struct ocfs2_extent_tree *et);
+        int (*eo_sanity_check)(struct ocfs2_extent_tree *et);
 
         /*
          * --------------------------------------------------------------
@@ -109,8 +132,17 @@ struct ocfs2_extent_tree_operations {
          * it exists.  If it does not, et->et_max_leaf_clusters is set
          * to 0 (unlimited).  Optional.
          */
-        void (*eo_fill_max_leaf_clusters)(struct inode *inode,
-                                          struct ocfs2_extent_tree *et);
+        void (*eo_fill_max_leaf_clusters)(struct ocfs2_extent_tree *et);
+
+        /*
+         * ->eo_extent_contig test whether the 2 ocfs2_extent_rec
+         * are contiguous or not. Optional. Don't need to set it if use
+         * ocfs2_extent_rec as the tree leaf.
+         */
+        enum ocfs2_contig_type
+                (*eo_extent_contig)(struct ocfs2_extent_tree *et,
+                                    struct ocfs2_extent_rec *ext,
+                                    struct ocfs2_extent_rec *insert_rec);
 };
 
 
@@ -121,19 +153,22 @@ struct ocfs2_extent_tree_operations {
 static u64 ocfs2_dinode_get_last_eb_blk(struct ocfs2_extent_tree *et);
 static void ocfs2_dinode_set_last_eb_blk(struct ocfs2_extent_tree *et,
                                          u64 blkno);
-static void ocfs2_dinode_update_clusters(struct inode *inode,
-                                         struct ocfs2_extent_tree *et,
+static void ocfs2_dinode_update_clusters(struct ocfs2_extent_tree *et,
                                          u32 clusters);
-static int ocfs2_dinode_insert_check(struct inode *inode,
-                                     struct ocfs2_extent_tree *et,
+static void ocfs2_dinode_extent_map_insert(struct ocfs2_extent_tree *et,
+                                           struct ocfs2_extent_rec *rec);
+static void ocfs2_dinode_extent_map_truncate(struct ocfs2_extent_tree *et,
+                                             u32 clusters);
+static int ocfs2_dinode_insert_check(struct ocfs2_extent_tree *et,
                                      struct ocfs2_extent_rec *rec);
-static int ocfs2_dinode_sanity_check(struct inode *inode,
-                                     struct ocfs2_extent_tree *et);
+static int ocfs2_dinode_sanity_check(struct ocfs2_extent_tree *et);
 static void ocfs2_dinode_fill_root_el(struct ocfs2_extent_tree *et);
 static struct ocfs2_extent_tree_operations ocfs2_dinode_et_ops = {
         .eo_set_last_eb_blk     = ocfs2_dinode_set_last_eb_blk,
         .eo_get_last_eb_blk     = ocfs2_dinode_get_last_eb_blk,
         .eo_update_clusters     = ocfs2_dinode_update_clusters,
+        .eo_extent_map_insert   = ocfs2_dinode_extent_map_insert,
+        .eo_extent_map_truncate = ocfs2_dinode_extent_map_truncate,
         .eo_insert_check        = ocfs2_dinode_insert_check,
         .eo_sanity_check        = ocfs2_dinode_sanity_check,
         .eo_fill_root_el        = ocfs2_dinode_fill_root_el,
@@ -156,40 +191,53 @@ static u64 ocfs2_dinode_get_last_eb_blk(struct ocfs2_extent_tree *et)
         return le64_to_cpu(di->i_last_eb_blk);
 }
 
-static void ocfs2_dinode_update_clusters(struct inode *inode,
-                                         struct ocfs2_extent_tree *et,
+static void ocfs2_dinode_update_clusters(struct ocfs2_extent_tree *et,
                                          u32 clusters)
 {
+        struct ocfs2_inode_info *oi = cache_info_to_inode(et->et_ci);
         struct ocfs2_dinode *di = et->et_object;
 
         le32_add_cpu(&di->i_clusters, clusters);
-        spin_lock(&OCFS2_I(inode)->ip_lock);
-        OCFS2_I(inode)->ip_clusters = le32_to_cpu(di->i_clusters);
-        spin_unlock(&OCFS2_I(inode)->ip_lock);
+        spin_lock(&oi->ip_lock);
+        oi->ip_clusters = le32_to_cpu(di->i_clusters);
+        spin_unlock(&oi->ip_lock);
 }
 
-static int ocfs2_dinode_insert_check(struct inode *inode,
-                                     struct ocfs2_extent_tree *et,
+static void ocfs2_dinode_extent_map_insert(struct ocfs2_extent_tree *et,
+                                           struct ocfs2_extent_rec *rec)
+{
+        struct inode *inode = &cache_info_to_inode(et->et_ci)->vfs_inode;
+
+        ocfs2_extent_map_insert_rec(inode, rec);
+}
+
+static void ocfs2_dinode_extent_map_truncate(struct ocfs2_extent_tree *et,
+                                             u32 clusters)
+{
+        struct inode *inode = &cache_info_to_inode(et->et_ci)->vfs_inode;
+
+        ocfs2_extent_map_trunc(inode, clusters);
+}
+
+static int ocfs2_dinode_insert_check(struct ocfs2_extent_tree *et,
                                      struct ocfs2_extent_rec *rec)
 {
-        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_inode_info *oi = cache_info_to_inode(et->et_ci);
+        struct ocfs2_super *osb = OCFS2_SB(oi->vfs_inode.i_sb);
 
-        BUG_ON(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL);
+        BUG_ON(oi->ip_dyn_features & OCFS2_INLINE_DATA_FL);
         mlog_bug_on_msg(!ocfs2_sparse_alloc(osb) &&
-                        (OCFS2_I(inode)->ip_clusters !=
-                         le32_to_cpu(rec->e_cpos)),
+                        (oi->ip_clusters != le32_to_cpu(rec->e_cpos)),
                         "Device %s, asking for sparse allocation: inode %llu, "
                         "cpos %u, clusters %u\n",
                         osb->dev_str,
-                        (unsigned long long)OCFS2_I(inode)->ip_blkno,
-                        rec->e_cpos,
-                        OCFS2_I(inode)->ip_clusters);
+                        (unsigned long long)oi->ip_blkno,
+                        rec->e_cpos, oi->ip_clusters);
 
         return 0;
 }
 
-static int ocfs2_dinode_sanity_check(struct inode *inode,
-                                     struct ocfs2_extent_tree *et)
+static int ocfs2_dinode_sanity_check(struct ocfs2_extent_tree *et)
 {
         struct ocfs2_dinode *di = et->et_object;
 
@@ -229,8 +277,7 @@ static u64 ocfs2_xattr_value_get_last_eb_blk(struct ocfs2_extent_tree *et)
         return le64_to_cpu(vb->vb_xv->xr_last_eb_blk);
 }
 
-static void ocfs2_xattr_value_update_clusters(struct inode *inode,
-                                              struct ocfs2_extent_tree *et,
+static void ocfs2_xattr_value_update_clusters(struct ocfs2_extent_tree *et,
                                               u32 clusters)
 {
         struct ocfs2_xattr_value_buf *vb = et->et_object;
@@ -252,12 +299,11 @@ static void ocfs2_xattr_tree_fill_root_el(struct ocfs2_extent_tree *et)
         et->et_root_el = &xb->xb_attrs.xb_root.xt_list;
 }
 
-static void ocfs2_xattr_tree_fill_max_leaf_clusters(struct inode *inode,
-                                                    struct ocfs2_extent_tree *et)
+static void ocfs2_xattr_tree_fill_max_leaf_clusters(struct ocfs2_extent_tree *et)
 {
+        struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci);
         et->et_max_leaf_clusters =
-                ocfs2_clusters_for_bytes(inode->i_sb,
-                                         OCFS2_MAX_XATTR_TREE_LEAF_SIZE);
+                ocfs2_clusters_for_bytes(sb, OCFS2_MAX_XATTR_TREE_LEAF_SIZE);
 }
 
 static void ocfs2_xattr_tree_set_last_eb_blk(struct ocfs2_extent_tree *et,
@@ -277,8 +323,7 @@ static u64 ocfs2_xattr_tree_get_last_eb_blk(struct ocfs2_extent_tree *et)
         return le64_to_cpu(xt->xt_last_eb_blk);
 }
 
-static void ocfs2_xattr_tree_update_clusters(struct inode *inode,
-                                             struct ocfs2_extent_tree *et,
+static void ocfs2_xattr_tree_update_clusters(struct ocfs2_extent_tree *et,
                                              u32 clusters)
 {
         struct ocfs2_xattr_block *xb = et->et_object;
@@ -309,8 +354,7 @@ static u64 ocfs2_dx_root_get_last_eb_blk(struct ocfs2_extent_tree *et)
         return le64_to_cpu(dx_root->dr_last_eb_blk);
 }
 
-static void ocfs2_dx_root_update_clusters(struct inode *inode,
-                                          struct ocfs2_extent_tree *et,
+static void ocfs2_dx_root_update_clusters(struct ocfs2_extent_tree *et,
                                           u32 clusters)
 {
         struct ocfs2_dx_root_block *dx_root = et->et_object;
@@ -318,8 +362,7 @@ static void ocfs2_dx_root_update_clusters(struct inode *inode,
         le32_add_cpu(&dx_root->dr_clusters, clusters);
 }
 
-static int ocfs2_dx_root_sanity_check(struct inode *inode,
-                                      struct ocfs2_extent_tree *et)
+static int ocfs2_dx_root_sanity_check(struct ocfs2_extent_tree *et)
 {
         struct ocfs2_dx_root_block *dx_root = et->et_object;
 
@@ -343,8 +386,54 @@ static struct ocfs2_extent_tree_operations ocfs2_dx_root_et_ops = {
         .eo_fill_root_el        = ocfs2_dx_root_fill_root_el,
 };
 
+static void ocfs2_refcount_tree_fill_root_el(struct ocfs2_extent_tree *et)
+{
+        struct ocfs2_refcount_block *rb = et->et_object;
+
+        et->et_root_el = &rb->rf_list;
+}
+
+static void ocfs2_refcount_tree_set_last_eb_blk(struct ocfs2_extent_tree *et,
+                                                u64 blkno)
+{
+        struct ocfs2_refcount_block *rb = et->et_object;
+
+        rb->rf_last_eb_blk = cpu_to_le64(blkno);
+}
+
+static u64 ocfs2_refcount_tree_get_last_eb_blk(struct ocfs2_extent_tree *et)
+{
+        struct ocfs2_refcount_block *rb = et->et_object;
+
+        return le64_to_cpu(rb->rf_last_eb_blk);
+}
+
+static void ocfs2_refcount_tree_update_clusters(struct ocfs2_extent_tree *et,
+                                                u32 clusters)
+{
+        struct ocfs2_refcount_block *rb = et->et_object;
+
+        le32_add_cpu(&rb->rf_clusters, clusters);
+}
+
+static enum ocfs2_contig_type
+ocfs2_refcount_tree_extent_contig(struct ocfs2_extent_tree *et,
+                                  struct ocfs2_extent_rec *ext,
+                                  struct ocfs2_extent_rec *insert_rec)
+{
+        return CONTIG_NONE;
+}
+
+static struct ocfs2_extent_tree_operations ocfs2_refcount_tree_et_ops = {
+        .eo_set_last_eb_blk     = ocfs2_refcount_tree_set_last_eb_blk,
+        .eo_get_last_eb_blk     = ocfs2_refcount_tree_get_last_eb_blk,
+        .eo_update_clusters     = ocfs2_refcount_tree_update_clusters,
+        .eo_fill_root_el        = ocfs2_refcount_tree_fill_root_el,
+        .eo_extent_contig       = ocfs2_refcount_tree_extent_contig,
+};
+
 static void __ocfs2_init_extent_tree(struct ocfs2_extent_tree *et,
-                                     struct inode *inode,
+                                     struct ocfs2_caching_info *ci,
                                      struct buffer_head *bh,
                                      ocfs2_journal_access_func access,
                                      void *obj,
@@ -352,6 +441,7 @@ static void __ocfs2_init_extent_tree(struct ocfs2_extent_tree *et,
 {
         et->et_ops = ops;
         et->et_root_bh = bh;
+        et->et_ci = ci;
         et->et_root_journal_access = access;
         if (!obj)
                 obj = (void *)bh->b_data;
@@ -361,41 +451,49 @@ static void __ocfs2_init_extent_tree(struct ocfs2_extent_tree *et,
         if (!et->et_ops->eo_fill_max_leaf_clusters)
                 et->et_max_leaf_clusters = 0;
         else
-                et->et_ops->eo_fill_max_leaf_clusters(inode, et);
+                et->et_ops->eo_fill_max_leaf_clusters(et);
 }
 
 void ocfs2_init_dinode_extent_tree(struct ocfs2_extent_tree *et,
-                                   struct inode *inode,
+                                   struct ocfs2_caching_info *ci,
                                    struct buffer_head *bh)
 {
-        __ocfs2_init_extent_tree(et, inode, bh, ocfs2_journal_access_di,
+        __ocfs2_init_extent_tree(et, ci, bh, ocfs2_journal_access_di,
                                  NULL, &ocfs2_dinode_et_ops);
 }
 
 void ocfs2_init_xattr_tree_extent_tree(struct ocfs2_extent_tree *et,
-                                       struct inode *inode,
+                                       struct ocfs2_caching_info *ci,
                                        struct buffer_head *bh)
 {
-        __ocfs2_init_extent_tree(et, inode, bh, ocfs2_journal_access_xb,
+        __ocfs2_init_extent_tree(et, ci, bh, ocfs2_journal_access_xb,
                                  NULL, &ocfs2_xattr_tree_et_ops);
 }
 
 void ocfs2_init_xattr_value_extent_tree(struct ocfs2_extent_tree *et,
-                                        struct inode *inode,
+                                        struct ocfs2_caching_info *ci,
                                         struct ocfs2_xattr_value_buf *vb)
 {
-        __ocfs2_init_extent_tree(et, inode, vb->vb_bh, vb->vb_access, vb,
+        __ocfs2_init_extent_tree(et, ci, vb->vb_bh, vb->vb_access, vb,
                                  &ocfs2_xattr_value_et_ops);
 }
 
 void ocfs2_init_dx_root_extent_tree(struct ocfs2_extent_tree *et,
-                                    struct inode *inode,
+                                    struct ocfs2_caching_info *ci,
                                     struct buffer_head *bh)
 {
-        __ocfs2_init_extent_tree(et, inode, bh, ocfs2_journal_access_dr,
+        __ocfs2_init_extent_tree(et, ci, bh, ocfs2_journal_access_dr,
                                  NULL, &ocfs2_dx_root_et_ops);
 }
 
+void ocfs2_init_refcount_extent_tree(struct ocfs2_extent_tree *et,
+                                     struct ocfs2_caching_info *ci,
+                                     struct buffer_head *bh)
+{
+        __ocfs2_init_extent_tree(et, ci, bh, ocfs2_journal_access_rb,
+                                 NULL, &ocfs2_refcount_tree_et_ops);
+}
+
 static inline void ocfs2_et_set_last_eb_blk(struct ocfs2_extent_tree *et,
                                             u64 new_last_eb_blk)
 {
@@ -407,78 +505,71 @@ static inline u64 ocfs2_et_get_last_eb_blk(struct ocfs2_extent_tree *et)
         return et->et_ops->eo_get_last_eb_blk(et);
 }
 
-static inline void ocfs2_et_update_clusters(struct inode *inode,
-                                            struct ocfs2_extent_tree *et,
+static inline void ocfs2_et_update_clusters(struct ocfs2_extent_tree *et,
                                             u32 clusters)
 {
-        et->et_ops->eo_update_clusters(inode, et, clusters);
+        et->et_ops->eo_update_clusters(et, clusters);
+}
+
+static inline void ocfs2_et_extent_map_insert(struct ocfs2_extent_tree *et,
+                                              struct ocfs2_extent_rec *rec)
+{
+        if (et->et_ops->eo_extent_map_insert)
+                et->et_ops->eo_extent_map_insert(et, rec);
+}
+
+static inline void ocfs2_et_extent_map_truncate(struct ocfs2_extent_tree *et,
+                                                u32 clusters)
+{
+        if (et->et_ops->eo_extent_map_truncate)
+                et->et_ops->eo_extent_map_truncate(et, clusters);
 }
 
 static inline int ocfs2_et_root_journal_access(handle_t *handle,
-                                               struct inode *inode,
                                                struct ocfs2_extent_tree *et,
                                                int type)
 {
-        return et->et_root_journal_access(handle, inode, et->et_root_bh,
+        return et->et_root_journal_access(handle, et->et_ci, et->et_root_bh,
                                           type);
 }
 
-static inline int ocfs2_et_insert_check(struct inode *inode,
-                                        struct ocfs2_extent_tree *et,
+static inline enum ocfs2_contig_type
+        ocfs2_et_extent_contig(struct ocfs2_extent_tree *et,
+                               struct ocfs2_extent_rec *rec,
+                               struct ocfs2_extent_rec *insert_rec)
+{
+        if (et->et_ops->eo_extent_contig)
+                return et->et_ops->eo_extent_contig(et, rec, insert_rec);
+
+        return ocfs2_extent_rec_contig(
+                                ocfs2_metadata_cache_get_super(et->et_ci),
+                                rec, insert_rec);
+}
+
+static inline int ocfs2_et_insert_check(struct ocfs2_extent_tree *et,
                                         struct ocfs2_extent_rec *rec)
 {
         int ret = 0;
 
         if (et->et_ops->eo_insert_check)
-                ret = et->et_ops->eo_insert_check(inode, et, rec);
+                ret = et->et_ops->eo_insert_check(et, rec);
         return ret;
 }
 
-static inline int ocfs2_et_sanity_check(struct inode *inode,
-                                        struct ocfs2_extent_tree *et)
+static inline int ocfs2_et_sanity_check(struct ocfs2_extent_tree *et)
 {
         int ret = 0;
 
         if (et->et_ops->eo_sanity_check)
-                ret = et->et_ops->eo_sanity_check(inode, et);
+                ret = et->et_ops->eo_sanity_check(et);
         return ret;
 }
 
 static void ocfs2_free_truncate_context(struct ocfs2_truncate_context *tc);
 static int ocfs2_cache_extent_block_free(struct ocfs2_cached_dealloc_ctxt *ctxt,
                                          struct ocfs2_extent_block *eb);
-
-/*
- * Structures which describe a path through a btree, and functions to
- * manipulate them.
- *
- * The idea here is to be as generic as possible with the tree
- * manipulation code.
- */
-struct ocfs2_path_item {
-        struct buffer_head              *bh;
-        struct ocfs2_extent_list        *el;
-};
-
-#define OCFS2_MAX_PATH_DEPTH    5
-
-struct ocfs2_path {
-        int                             p_tree_depth;
-        ocfs2_journal_access_func       p_root_access;
-        struct ocfs2_path_item          p_node[OCFS2_MAX_PATH_DEPTH];
-};
-
-#define path_root_bh(_path) ((_path)->p_node[0].bh)
-#define path_root_el(_path) ((_path)->p_node[0].el)
-#define path_root_access(_path)((_path)->p_root_access)
-#define path_leaf_bh(_path) ((_path)->p_node[(_path)->p_tree_depth].bh)
-#define path_leaf_el(_path) ((_path)->p_node[(_path)->p_tree_depth].el)
-#define path_num_items(_path) ((_path)->p_tree_depth + 1)
-
-static int ocfs2_find_path(struct inode *inode, struct ocfs2_path *path,
-                           u32 cpos);
-static void ocfs2_adjust_rightmost_records(struct inode *inode,
-                                           handle_t *handle,
+static void ocfs2_adjust_rightmost_records(handle_t *handle,
+                                           struct ocfs2_extent_tree *et,
                                            struct ocfs2_path *path,
                                            struct ocfs2_extent_rec *insert_rec);
 /*
@@ -486,7 +577,7 @@ static void ocfs2_adjust_rightmost_records(struct inode *inode,
  * to build another path. Generally, this involves freeing the buffer
  * heads.
  */
-static void ocfs2_reinit_path(struct ocfs2_path *path, int keep_root)
+void ocfs2_reinit_path(struct ocfs2_path *path, int keep_root)
 {
         int i, start = 0, depth = 0;
         struct ocfs2_path_item *node;
@@ -515,7 +606,7 @@ static void ocfs2_reinit_path(struct ocfs2_path *path, int keep_root)
         path->p_tree_depth = depth;
 }
 
-static void ocfs2_free_path(struct ocfs2_path *path)
+void ocfs2_free_path(struct ocfs2_path *path)
 {
         if (path) {
                 ocfs2_reinit_path(path, 0);
@@ -613,13 +704,13 @@ static struct ocfs2_path *ocfs2_new_path(struct buffer_head *root_bh,
         return path;
 }
 
-static struct ocfs2_path *ocfs2_new_path_from_path(struct ocfs2_path *path)
+struct ocfs2_path *ocfs2_new_path_from_path(struct ocfs2_path *path)
 {
         return ocfs2_new_path(path_root_bh(path), path_root_el(path),
                               path_root_access(path));
 }
 
-static struct ocfs2_path *ocfs2_new_path_from_et(struct ocfs2_extent_tree *et)
+struct ocfs2_path *ocfs2_new_path_from_et(struct ocfs2_extent_tree *et)
 {
         return ocfs2_new_path(et->et_root_bh, et->et_root_el,
                               et->et_root_journal_access);
@@ -632,10 +723,10 @@ static struct ocfs2_path *ocfs2_new_path_from_et(struct ocfs2_extent_tree *et)
  * I don't like the way this function's name looks next to
  * ocfs2_journal_access_path(), but I don't have a better one.
  */
-static int ocfs2_path_bh_journal_access(handle_t *handle,
-                                        struct inode *inode,
-                                        struct ocfs2_path *path,
-                                        int idx)
+int ocfs2_path_bh_journal_access(handle_t *handle,
+                                 struct ocfs2_caching_info *ci,
+                                 struct ocfs2_path *path,
+                                 int idx)
 {
         ocfs2_journal_access_func access = path_root_access(path);
 
@@ -645,15 +736,16 @@ static int ocfs2_path_bh_journal_access(handle_t *handle,
         if (idx)
                 access = ocfs2_journal_access_eb;
 
-        return access(handle, inode, path->p_node[idx].bh,
+        return access(handle, ci, path->p_node[idx].bh,
                       OCFS2_JOURNAL_ACCESS_WRITE);
 }
 
 /*
  * Convenience function to journal all components in a path.
  */
-static int ocfs2_journal_access_path(struct inode *inode, handle_t *handle,
-                                     struct ocfs2_path *path)
+int ocfs2_journal_access_path(struct ocfs2_caching_info *ci,
+                              handle_t *handle,
+                              struct ocfs2_path *path)
 {
         int i, ret = 0;
 
@@ -661,7 +753,7 @@ static int ocfs2_journal_access_path(struct inode *inode, handle_t *handle,
                 goto out;
 
         for(i = 0; i < path_num_items(path); i++) {
-                ret = ocfs2_path_bh_journal_access(handle, inode, path, i);
+                ret = ocfs2_path_bh_journal_access(handle, ci, path, i);
                 if (ret < 0) {
                         mlog_errno(ret);
                         goto out;
@@ -702,17 +794,9 @@ int ocfs2_search_extent_list(struct ocfs2_extent_list *el, u32 v_cluster)
         return ret;
 }
 
-enum ocfs2_contig_type {
-        CONTIG_NONE = 0,
-        CONTIG_LEFT,
-        CONTIG_RIGHT,
-        CONTIG_LEFTRIGHT,
-};
-
-
 /*
  * NOTE: ocfs2_block_extent_contig(), ocfs2_extents_adjacent() and
- * ocfs2_extent_contig only work properly against leaf nodes!
+ * ocfs2_extent_rec_contig only work properly against leaf nodes!
  */
 static int ocfs2_block_extent_contig(struct super_block *sb,
                                      struct ocfs2_extent_rec *ext,
@@ -738,9 +822,9 @@ static int ocfs2_extents_adjacent(struct ocfs2_extent_rec *left,
 }
 
 static enum ocfs2_contig_type
-        ocfs2_extent_contig(struct inode *inode,
-                            struct ocfs2_extent_rec *ext,
-                            struct ocfs2_extent_rec *insert_rec)
+        ocfs2_extent_rec_contig(struct super_block *sb,
+                                struct ocfs2_extent_rec *ext,
+                                struct ocfs2_extent_rec *insert_rec)
 {
         u64 blkno = le64_to_cpu(insert_rec->e_blkno);
 
@@ -753,12 +837,12 @@ static enum ocfs2_contig_type
                 return CONTIG_NONE;
 
         if (ocfs2_extents_adjacent(ext, insert_rec) &&
-            ocfs2_block_extent_contig(inode->i_sb, ext, blkno))
+            ocfs2_block_extent_contig(sb, ext, blkno))
                         return CONTIG_RIGHT;
 
         blkno = le64_to_cpu(ext->e_blkno);
         if (ocfs2_extents_adjacent(insert_rec, ext) &&
-            ocfs2_block_extent_contig(inode->i_sb, insert_rec, blkno))
+            ocfs2_block_extent_contig(sb, insert_rec, blkno))
                 return CONTIG_LEFT;
 
         return CONTIG_NONE;
@@ -853,13 +937,13 @@ static int ocfs2_validate_extent_block(struct super_block *sb,
         return 0;
 }
 
-int ocfs2_read_extent_block(struct inode *inode, u64 eb_blkno,
+int ocfs2_read_extent_block(struct ocfs2_caching_info *ci, u64 eb_blkno,
                             struct buffer_head **bh)
 {
         int rc;
         struct buffer_head *tmp = *bh;
 
-        rc = ocfs2_read_block(inode, eb_blkno, &tmp,
+        rc = ocfs2_read_block(ci, eb_blkno, &tmp,
                               ocfs2_validate_extent_block);
 
         /* If ocfs2_read_block() got us a new bh, pass it up. */
@@ -874,7 +958,6 @@ int ocfs2_read_extent_block(struct inode *inode, u64 eb_blkno,
  * How many free extents have we got before we need more meta data?
  */
 int ocfs2_num_free_extents(struct ocfs2_super *osb,
-                           struct inode *inode,
                            struct ocfs2_extent_tree *et)
 {
         int retval;
@@ -889,7 +972,8 @@ int ocfs2_num_free_extents(struct ocfs2_super *osb,
         last_eb_blk = ocfs2_et_get_last_eb_blk(et);
 
         if (last_eb_blk) {
-                retval = ocfs2_read_extent_block(inode, last_eb_blk, &eb_bh);
+                retval = ocfs2_read_extent_block(et->et_ci, last_eb_blk,
+                                                 &eb_bh);
                 if (retval < 0) {
                         mlog_errno(retval);
                         goto bail;
@@ -913,9 +997,8 @@ bail:
  * sets h_signature, h_blkno, h_suballoc_bit, h_suballoc_slot, and
  * l_count for you
  */
-static int ocfs2_create_new_meta_bhs(struct ocfs2_super *osb,
-                                     handle_t *handle,
-                                     struct inode *inode,
+static int ocfs2_create_new_meta_bhs(handle_t *handle,
+                                     struct ocfs2_extent_tree *et,
                                      int wanted,
                                      struct ocfs2_alloc_context *meta_ac,
                                      struct buffer_head *bhs[])
@@ -924,6 +1007,8 @@ static int ocfs2_create_new_meta_bhs(struct ocfs2_super *osb,
         u16 suballoc_bit_start;
         u32 num_got;
         u64 first_blkno;
+        struct ocfs2_super *osb =
+                OCFS2_SB(ocfs2_metadata_cache_get_super(et->et_ci));
         struct ocfs2_extent_block *eb;
 
         mlog_entry_void();
@@ -949,9 +1034,10 @@ static int ocfs2_create_new_meta_bhs(struct ocfs2_super *osb,
                                 mlog_errno(status);
                                 goto bail;
                         }
-                        ocfs2_set_new_buffer_uptodate(inode, bhs[i]);
+                        ocfs2_set_new_buffer_uptodate(et->et_ci, bhs[i]);
 
-                        status = ocfs2_journal_access_eb(handle, inode, bhs[i],
+                        status = ocfs2_journal_access_eb(handle, et->et_ci,
+                                                         bhs[i],
                                                          OCFS2_JOURNAL_ACCESS_CREATE);
                         if (status < 0) {
                                 mlog_errno(status);
@@ -1023,7 +1109,6 @@ static inline u32 ocfs2_sum_rightmost_rec(struct ocfs2_extent_list  *el)
  * extent block's rightmost record.
  */
 static int ocfs2_adjust_rightmost_branch(handle_t *handle,
-                                         struct inode *inode,
                                          struct ocfs2_extent_tree *et)
 {
         int status;
@@ -1037,7 +1122,7 @@ static int ocfs2_adjust_rightmost_branch(handle_t *handle,
                 return status;
         }
 
-        status = ocfs2_find_path(inode, path, UINT_MAX);
+        status = ocfs2_find_path(et->et_ci, path, UINT_MAX);
         if (status < 0) {
                 mlog_errno(status);
                 goto out;
@@ -1050,7 +1135,7 @@ static int ocfs2_adjust_rightmost_branch(handle_t *handle,
                 goto out;
         }
 
-        status = ocfs2_journal_access_path(inode, handle, path);
+        status = ocfs2_journal_access_path(et->et_ci, handle, path);
         if (status < 0) {
                 mlog_errno(status);
                 goto out;
@@ -1059,7 +1144,7 @@ static int ocfs2_adjust_rightmost_branch(handle_t *handle,
         el = path_leaf_el(path);
         rec = &el->l_recs[le32_to_cpu(el->l_next_free_rec) - 1];
 
-        ocfs2_adjust_rightmost_records(inode, handle, path, rec);
+        ocfs2_adjust_rightmost_records(handle, et, path, rec);
 
 out:
         ocfs2_free_path(path);
@@ -1068,7 +1153,7 @@ out:
 
 /*
  * Add an entire tree branch to our inode. eb_bh is the extent block
- * to start at, if we don't want to start the branch at the dinode
+ * to start at, if we don't want to start the branch at the root
  * structure.
  *
  * last_eb_bh is required as we have to update it's next_leaf pointer
@@ -1077,9 +1162,7 @@ out:
  * the new branch will be 'empty' in the sense that every block will
  * contain a single record with cluster count == 0.
  */
-static int ocfs2_add_branch(struct ocfs2_super *osb,
-                            handle_t *handle,
-                            struct inode *inode,
+static int ocfs2_add_branch(handle_t *handle,
                             struct ocfs2_extent_tree *et,
                             struct buffer_head *eb_bh,
                             struct buffer_head **last_eb_bh,
@@ -1123,7 +1206,7 @@ static int ocfs2_add_branch(struct ocfs2_super *osb,
         if (root_end > new_cpos) {
                 mlog(0, "adjust the cluster end from %u to %u\n",
                      root_end, new_cpos);
-                status = ocfs2_adjust_rightmost_branch(handle, inode, et);
+                status = ocfs2_adjust_rightmost_branch(handle, et);
                 if (status) {
                         mlog_errno(status);
                         goto bail;
@@ -1139,7 +1222,7 @@ static int ocfs2_add_branch(struct ocfs2_super *osb,
                 goto bail;
         }
 
-        status = ocfs2_create_new_meta_bhs(osb, handle, inode, new_blocks,
+        status = ocfs2_create_new_meta_bhs(handle, et, new_blocks,
                                            meta_ac, new_eb_bhs);
         if (status < 0) {
                 mlog_errno(status);
@@ -1161,7 +1244,7 @@ static int ocfs2_add_branch(struct ocfs2_super *osb,
                 BUG_ON(!OCFS2_IS_VALID_EXTENT_BLOCK(eb));
                 eb_el = &eb->h_list;
 
-                status = ocfs2_journal_access_eb(handle, inode, bh,
+                status = ocfs2_journal_access_eb(handle, et->et_ci, bh,
                                                  OCFS2_JOURNAL_ACCESS_CREATE);
                 if (status < 0) {
                         mlog_errno(status);
@@ -1201,20 +1284,20 @@ static int ocfs2_add_branch(struct ocfs2_super *osb,
          * journal_dirty erroring as it won't unless we've aborted the
          * handle (in which case we would never be here) so reserving
          * the write with journal_access is all we need to do. */
-        status = ocfs2_journal_access_eb(handle, inode, *last_eb_bh,
+        status = ocfs2_journal_access_eb(handle, et->et_ci, *last_eb_bh,
                                          OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
                 goto bail;
         }
-        status = ocfs2_et_root_journal_access(handle, inode, et,
+        status = ocfs2_et_root_journal_access(handle, et,
                                               OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
                 goto bail;
         }
         if (eb_bh) {
-                status = ocfs2_journal_access_eb(handle, inode, eb_bh,
+                status = ocfs2_journal_access_eb(handle, et->et_ci, eb_bh,
                                                  OCFS2_JOURNAL_ACCESS_WRITE);
                 if (status < 0) {
                         mlog_errno(status);
@@ -1274,9 +1357,7 @@ bail:
  * returns back the new extent block so you can add a branch to it
  * after this call.
  */
-static int ocfs2_shift_tree_depth(struct ocfs2_super *osb,
-                                  handle_t *handle,
-                                  struct inode *inode,
+static int ocfs2_shift_tree_depth(handle_t *handle,
                                   struct ocfs2_extent_tree *et,
                                   struct ocfs2_alloc_context *meta_ac,
                                   struct buffer_head **ret_new_eb_bh)
@@ -1290,7 +1371,7 @@ static int ocfs2_shift_tree_depth(struct ocfs2_super *osb,
 
         mlog_entry_void();
 
-        status = ocfs2_create_new_meta_bhs(osb, handle, inode, 1, meta_ac,
+        status = ocfs2_create_new_meta_bhs(handle, et, 1, meta_ac,
                                            &new_eb_bh);
         if (status < 0) {
                 mlog_errno(status);
@@ -1304,7 +1385,7 @@ static int ocfs2_shift_tree_depth(struct ocfs2_super *osb,
         eb_el = &eb->h_list;
         root_el = et->et_root_el;
 
-        status = ocfs2_journal_access_eb(handle, inode, new_eb_bh,
+        status = ocfs2_journal_access_eb(handle, et->et_ci, new_eb_bh,
                                          OCFS2_JOURNAL_ACCESS_CREATE);
         if (status < 0) {
                 mlog_errno(status);
@@ -1323,7 +1404,7 @@ static int ocfs2_shift_tree_depth(struct ocfs2_super *osb,
                 goto bail;
         }
 
-        status = ocfs2_et_root_journal_access(handle, inode, et,
+        status = ocfs2_et_root_journal_access(handle, et,
                                               OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
@@ -1379,9 +1460,7 @@ bail:
  *
  * return status < 0 indicates an error.
  */
-static int ocfs2_find_branch_target(struct ocfs2_super *osb,
-                                    struct inode *inode,
-                                    struct ocfs2_extent_tree *et,
+static int ocfs2_find_branch_target(struct ocfs2_extent_tree *et,
                                     struct buffer_head **target_bh)
 {
         int status = 0, i;
@@ -1399,19 +1478,21 @@ static int ocfs2_find_branch_target(struct ocfs2_super *osb,
 
         while(le16_to_cpu(el->l_tree_depth) > 1) {
                 if (le16_to_cpu(el->l_next_free_rec) == 0) {
-                        ocfs2_error(inode->i_sb, "Dinode %llu has empty "
+                        ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci),
+                                    "Owner %llu has empty "
                                     "extent list (next_free_rec == 0)",
-                                    (unsigned long long)OCFS2_I(inode)->ip_blkno);
+                                    (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci));
                         status = -EIO;
                         goto bail;
                 }
                 i = le16_to_cpu(el->l_next_free_rec) - 1;
                 blkno = le64_to_cpu(el->l_recs[i].e_blkno);
                 if (!blkno) {
-                        ocfs2_error(inode->i_sb, "Dinode %llu has extent "
+                        ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci),
+                                    "Owner %llu has extent "
                                     "list where extent # %d has no physical "
                                     "block start",
-                                    (unsigned long long)OCFS2_I(inode)->ip_blkno, i);
+                                    (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), i);
                         status = -EIO;
                         goto bail;
                 }
@@ -1419,7 +1500,7 @@ static int ocfs2_find_branch_target(struct ocfs2_super *osb,
                 brelse(bh);
                 bh = NULL;
 
-                status = ocfs2_read_extent_block(inode, blkno, &bh);
+                status = ocfs2_read_extent_block(et->et_ci, blkno, &bh);
                 if (status < 0) {
                         mlog_errno(status);
                         goto bail;
@@ -1460,20 +1541,18 @@ bail:
  *
  * *last_eb_bh will be updated by ocfs2_add_branch().
  */
-static int ocfs2_grow_tree(struct inode *inode, handle_t *handle,
-                           struct ocfs2_extent_tree *et, int *final_depth,
-                           struct buffer_head **last_eb_bh,
+static int ocfs2_grow_tree(handle_t *handle, struct ocfs2_extent_tree *et,
+                           int *final_depth, struct buffer_head **last_eb_bh,
                            struct ocfs2_alloc_context *meta_ac)
 {
         int ret, shift;
         struct ocfs2_extent_list *el = et->et_root_el;
         int depth = le16_to_cpu(el->l_tree_depth);
-        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
         struct buffer_head *bh = NULL;
 
         BUG_ON(meta_ac == NULL);
 
-        shift = ocfs2_find_branch_target(osb, inode, et, &bh);
+        shift = ocfs2_find_branch_target(et, &bh);
         if (shift < 0) {
                 ret = shift;
                 mlog_errno(ret);
@@ -1490,8 +1569,7 @@ static int ocfs2_grow_tree(struct inode *inode, handle_t *handle,
                 /* ocfs2_shift_tree_depth will return us a buffer with
                  * the new extent block (so we can pass that to
                  * ocfs2_add_branch). */
-                ret = ocfs2_shift_tree_depth(osb, handle, inode, et,
-                                             meta_ac, &bh);
+                ret = ocfs2_shift_tree_depth(handle, et, meta_ac, &bh);
                 if (ret < 0) {
                         mlog_errno(ret);
                         goto out;
@@ -1517,7 +1595,7 @@ static int ocfs2_grow_tree(struct inode *inode, handle_t *handle,
         /* call ocfs2_add_branch to add the final part of the tree with
          * the new data. */
         mlog(0, "add branch. bh = %p\n", bh);
-        ret = ocfs2_add_branch(osb, handle, inode, et, bh, last_eb_bh,
+        ret = ocfs2_add_branch(handle, et, bh, last_eb_bh,
                                meta_ac);
         if (ret < 0) {
                 mlog_errno(ret);
@@ -1687,7 +1765,7 @@ set_and_inc:
  *
  * The array index of the subtree root is passed back.
  */
-static int ocfs2_find_subtree_root(struct inode *inode,
+static int ocfs2_find_subtree_root(struct ocfs2_extent_tree *et,
                                    struct ocfs2_path *left,
                                    struct ocfs2_path *right)
 {
@@ -1705,10 +1783,10 @@ static int ocfs2_find_subtree_root(struct inode *inode,
                  * The caller didn't pass two adjacent paths.
                  */
                 mlog_bug_on_msg(i > left->p_tree_depth,
-                                "Inode %lu, left depth %u, right depth %u\n"
+                                "Owner %llu, left depth %u, right depth %u\n"
                                 "left leaf blk %llu, right leaf blk %llu\n",
-                                inode->i_ino, left->p_tree_depth,
-                                right->p_tree_depth,
+                                (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci),
+                                left->p_tree_depth, right->p_tree_depth,
                                 (unsigned long long)path_leaf_bh(left)->b_blocknr,
                                 (unsigned long long)path_leaf_bh(right)->b_blocknr);
         } while (left->p_node[i].bh->b_blocknr ==
@@ -1725,7 +1803,7 @@ typedef void (path_insert_t)(void *, struct buffer_head *);
  * This code can be called with a cpos larger than the tree, in which
  * case it will return the rightmost path.
  */
-static int __ocfs2_find_path(struct inode *inode,
+static int __ocfs2_find_path(struct ocfs2_caching_info *ci,
                              struct ocfs2_extent_list *root_el, u32 cpos,
                              path_insert_t *func, void *data)
 {
@@ -1736,15 +1814,14 @@ static int __ocfs2_find_path(struct inode *inode,
         struct ocfs2_extent_block *eb;
         struct ocfs2_extent_list *el;
         struct ocfs2_extent_rec *rec;
-        struct ocfs2_inode_info *oi = OCFS2_I(inode);
 
         el = root_el;
         while (el->l_tree_depth) {
                 if (le16_to_cpu(el->l_next_free_rec) == 0) {
-                        ocfs2_error(inode->i_sb,
-                                    "Inode %llu has empty extent list at "
+                        ocfs2_error(ocfs2_metadata_cache_get_super(ci),
+                                    "Owner %llu has empty extent list at "
                                     "depth %u\n",
-                                    (unsigned long long)oi->ip_blkno,
+                                    (unsigned long long)ocfs2_metadata_cache_owner(ci),
                                     le16_to_cpu(el->l_tree_depth));
                         ret = -EROFS;
                         goto out;
@@ -1767,10 +1844,10 @@ static int __ocfs2_find_path(struct inode *inode,
 
                 blkno = le64_to_cpu(el->l_recs[i].e_blkno);
                 if (blkno == 0) {
-                        ocfs2_error(inode->i_sb,
-                                    "Inode %llu has bad blkno in extent list "
+                        ocfs2_error(ocfs2_metadata_cache_get_super(ci),
+                                    "Owner %llu has bad blkno in extent list "
                                     "at depth %u (index %d)\n",
-                                    (unsigned long long)oi->ip_blkno,
+                                    (unsigned long long)ocfs2_metadata_cache_owner(ci),
                                     le16_to_cpu(el->l_tree_depth), i);
                         ret = -EROFS;
                         goto out;
@@ -1778,7 +1855,7 @@ static int __ocfs2_find_path(struct inode *inode,
 
                 brelse(bh);
                 bh = NULL;
-                ret = ocfs2_read_extent_block(inode, blkno, &bh);
+                ret = ocfs2_read_extent_block(ci, blkno, &bh);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -1789,10 +1866,10 @@ static int __ocfs2_find_path(struct inode *inode,
 
                 if (le16_to_cpu(el->l_next_free_rec) >
                     le16_to_cpu(el->l_count)) {
-                        ocfs2_error(inode->i_sb,
-                                    "Inode %llu has bad count in extent list "
+                        ocfs2_error(ocfs2_metadata_cache_get_super(ci),
+                                    "Owner %llu has bad count in extent list "
                                     "at block %llu (next free=%u, count=%u)\n",
-                                    (unsigned long long)oi->ip_blkno,
+                                    (unsigned long long)ocfs2_metadata_cache_owner(ci),
                                     (unsigned long long)bh->b_blocknr,
                                     le16_to_cpu(el->l_next_free_rec),
                                     le16_to_cpu(el->l_count));
@@ -1836,14 +1913,14 @@ static void find_path_ins(void *data, struct buffer_head *bh)
         ocfs2_path_insert_eb(fp->path, fp->index, bh);
         fp->index++;
 }
-static int ocfs2_find_path(struct inode *inode, struct ocfs2_path *path,
-                           u32 cpos)
+int ocfs2_find_path(struct ocfs2_caching_info *ci,
+                    struct ocfs2_path *path, u32 cpos)
 {
         struct find_path_data data;
 
         data.index = 1;
         data.path = path;
-        return __ocfs2_find_path(inode, path_root_el(path), cpos,
+        return __ocfs2_find_path(ci, path_root_el(path), cpos,
                                  find_path_ins, &data);
 }
 
@@ -1868,13 +1945,14 @@ static void find_leaf_ins(void *data, struct buffer_head *bh)
  *
  * This function doesn't handle non btree extent lists.
  */
-int ocfs2_find_leaf(struct inode *inode, struct ocfs2_extent_list *root_el,
-                    u32 cpos, struct buffer_head **leaf_bh)
+int ocfs2_find_leaf(struct ocfs2_caching_info *ci,
+                    struct ocfs2_extent_list *root_el, u32 cpos,
+                    struct buffer_head **leaf_bh)
 {
         int ret;
         struct buffer_head *bh = NULL;
 
-        ret = __ocfs2_find_path(inode, root_el, cpos, find_leaf_ins, &bh);
+        ret = __ocfs2_find_path(ci, root_el, cpos, find_leaf_ins, &bh);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -1980,7 +2058,7 @@ static void ocfs2_adjust_root_records(struct ocfs2_extent_list *root_el,
  *   - When we've adjusted the last extent record in the left path leaf and the
  *     1st extent record in the right path leaf during cross extent block merge.
  */
-static void ocfs2_complete_edge_insert(struct inode *inode, handle_t *handle,
+static void ocfs2_complete_edge_insert(handle_t *handle,
                                        struct ocfs2_path *left_path,
                                        struct ocfs2_path *right_path,
                                        int subtree_index)
@@ -2058,8 +2136,8 @@ static void ocfs2_complete_edge_insert(struct inode *inode, handle_t *handle,
                 mlog_errno(ret);
 }
 
-static int ocfs2_rotate_subtree_right(struct inode *inode,
-                                      handle_t *handle,
+static int ocfs2_rotate_subtree_right(handle_t *handle,
+                                      struct ocfs2_extent_tree *et,
                                       struct ocfs2_path *left_path,
                                       struct ocfs2_path *right_path,
                                       int subtree_index)
@@ -2075,10 +2153,10 @@ static int ocfs2_rotate_subtree_right(struct inode *inode,
         left_el = path_leaf_el(left_path);
 
         if (left_el->l_next_free_rec != left_el->l_count) {
-                ocfs2_error(inode->i_sb,
+                ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci),
                             "Inode %llu has non-full interior leaf node %llu"
                             "(next free = %u)",
-                            (unsigned long long)OCFS2_I(inode)->ip_blkno,
+                            (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci),
                             (unsigned long long)left_leaf_bh->b_blocknr,
                             le16_to_cpu(left_el->l_next_free_rec));
                 return -EROFS;
@@ -2094,7 +2172,7 @@ static int ocfs2_rotate_subtree_right(struct inode *inode,
         root_bh = left_path->p_node[subtree_index].bh;
         BUG_ON(root_bh != right_path->p_node[subtree_index].bh);
 
-        ret = ocfs2_path_bh_journal_access(handle, inode, right_path,
+        ret = ocfs2_path_bh_journal_access(handle, et->et_ci, right_path,
                                            subtree_index);
         if (ret) {
                 mlog_errno(ret);
@@ -2102,14 +2180,14 @@ static int ocfs2_rotate_subtree_right(struct inode *inode,
         }
 
         for(i = subtree_index + 1; i < path_num_items(right_path); i++) {
-                ret = ocfs2_path_bh_journal_access(handle, inode,
+                ret = ocfs2_path_bh_journal_access(handle, et->et_ci,
                                                    right_path, i);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
                 }
 
-                ret = ocfs2_path_bh_journal_access(handle, inode,
+                ret = ocfs2_path_bh_journal_access(handle, et->et_ci,
                                                    left_path, i);
                 if (ret) {
                         mlog_errno(ret);
@@ -2123,7 +2201,7 @@ static int ocfs2_rotate_subtree_right(struct inode *inode,
         /* This is a code error, not a disk corruption. */
         mlog_bug_on_msg(!right_el->l_next_free_rec, "Inode %llu: Rotate fails "
                         "because rightmost leaf block %llu is empty\n",
-                        (unsigned long long)OCFS2_I(inode)->ip_blkno,
+                        (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci),
                         (unsigned long long)right_leaf_bh->b_blocknr);
 
         ocfs2_create_empty_extent(right_el);
@@ -2157,8 +2235,8 @@ static int ocfs2_rotate_subtree_right(struct inode *inode,
                 goto out;
         }
 
-        ocfs2_complete_edge_insert(inode, handle, left_path, right_path,
-                                subtree_index);
+        ocfs2_complete_edge_insert(handle, left_path, right_path,
+                                   subtree_index);
 
 out:
         return ret;
@@ -2248,10 +2326,18 @@ static int ocfs2_extend_rotate_transaction(handle_t *handle, int subtree_depth,
                                            int op_credits,
                                            struct ocfs2_path *path)
 {
+        int ret;
         int credits = (path->p_tree_depth - subtree_depth) * 2 + 1 + op_credits;
 
-        if (handle->h_buffer_credits < credits)
-                return ocfs2_extend_trans(handle, credits);
+        if (handle->h_buffer_credits < credits) {
+                ret = ocfs2_extend_trans(handle,
+                                         credits - handle->h_buffer_credits);
+                if (ret)
+                        return ret;
+
+                if (unlikely(handle->h_buffer_credits < credits))
+                        return ocfs2_extend_trans(handle, credits);
+        }
 
         return 0;
 }
@@ -2321,8 +2407,8 @@ static int ocfs2_leftmost_rec_contains(struct ocfs2_extent_list *el, u32 cpos)
  *   *ret_left_path will contain a valid path which can be passed to
  *   ocfs2_insert_path().
  */
-static int ocfs2_rotate_tree_right(struct inode *inode,
-                                   handle_t *handle,
+static int ocfs2_rotate_tree_right(handle_t *handle,
+                                   struct ocfs2_extent_tree *et,
                                    enum ocfs2_split_type split,
                                    u32 insert_cpos,
                                    struct ocfs2_path *right_path,
@@ -2331,6 +2417,7 @@ static int ocfs2_rotate_tree_right(struct inode *inode,
         int ret, start, orig_credits = handle->h_buffer_credits;
         u32 cpos;
         struct ocfs2_path *left_path = NULL;
+        struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci);
 
         *ret_left_path = NULL;
 
@@ -2341,7 +2428,7 @@ static int ocfs2_rotate_tree_right(struct inode *inode,
                 goto out;
         }
 
-        ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb, right_path, &cpos);
+        ret = ocfs2_find_cpos_for_left_leaf(sb, right_path, &cpos);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -2379,7 +2466,7 @@ static int ocfs2_rotate_tree_right(struct inode *inode,
                 mlog(0, "Rotating a tree: ins. cpos: %u, left path cpos: %u\n",
                      insert_cpos, cpos);
 
-                ret = ocfs2_find_path(inode, left_path, cpos);
+                ret = ocfs2_find_path(et->et_ci, left_path, cpos);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -2387,10 +2474,11 @@ static int ocfs2_rotate_tree_right(struct inode *inode,
 
                 mlog_bug_on_msg(path_leaf_bh(left_path) ==
                                 path_leaf_bh(right_path),
-                                "Inode %lu: error during insert of %u "
+                                "Owner %llu: error during insert of %u "
                                 "(left path cpos %u) results in two identical "
                                 "paths ending at %llu\n",
-                                inode->i_ino, insert_cpos, cpos,
+                                (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci),
+                                insert_cpos, cpos,
                                 (unsigned long long)
                                 path_leaf_bh(left_path)->b_blocknr);
 
@@ -2416,7 +2504,7 @@ static int ocfs2_rotate_tree_right(struct inode *inode,
                         goto out_ret_path;
                 }
 
-                start = ocfs2_find_subtree_root(inode, left_path, right_path);
+                start = ocfs2_find_subtree_root(et, left_path, right_path);
 
                 mlog(0, "Subtree root at index %d (blk %llu, depth %d)\n",
                      start,
@@ -2430,7 +2518,7 @@ static int ocfs2_rotate_tree_right(struct inode *inode,
                         goto out;
                 }
 
-                ret = ocfs2_rotate_subtree_right(inode, handle, left_path,
+                ret = ocfs2_rotate_subtree_right(handle, et, left_path,
                                                  right_path, start);
                 if (ret) {
                         mlog_errno(ret);
@@ -2462,8 +2550,7 @@ static int ocfs2_rotate_tree_right(struct inode *inode,
                  */
                 ocfs2_mv_path(right_path, left_path);
 
-                ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb, right_path,
-                                                    &cpos);
+                ret = ocfs2_find_cpos_for_left_leaf(sb, right_path, &cpos);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -2477,7 +2564,8 @@ out_ret_path:
         return ret;
 }
 
-static int ocfs2_update_edge_lengths(struct inode *inode, handle_t *handle,
+static int ocfs2_update_edge_lengths(handle_t *handle,
+                                     struct ocfs2_extent_tree *et,
                                      int subtree_index, struct ocfs2_path *path)
 {
         int i, idx, ret;
@@ -2502,7 +2590,7 @@ static int ocfs2_update_edge_lengths(struct inode *inode, handle_t *handle,
                 goto out;
         }
 
-        ret = ocfs2_journal_access_path(inode, handle, path);
+        ret = ocfs2_journal_access_path(et->et_ci, handle, path);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -2532,7 +2620,8 @@ out:
         return ret;
 }
 
-static void ocfs2_unlink_path(struct inode *inode, handle_t *handle,
+static void ocfs2_unlink_path(handle_t *handle,
+                              struct ocfs2_extent_tree *et,
                               struct ocfs2_cached_dealloc_ctxt *dealloc,
                               struct ocfs2_path *path, int unlink_start)
 {
@@ -2554,12 +2643,12 @@ static void ocfs2_unlink_path(struct inode *inode, handle_t *handle,
                         mlog(ML_ERROR,
                              "Inode %llu, attempted to remove extent block "
                              "%llu with %u records\n",
-                             (unsigned long long)OCFS2_I(inode)->ip_blkno,
+                             (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci),
                              (unsigned long long)le64_to_cpu(eb->h_blkno),
                              le16_to_cpu(el->l_next_free_rec));
 
                         ocfs2_journal_dirty(handle, bh);
-                        ocfs2_remove_from_cache(inode, bh);
+                        ocfs2_remove_from_cache(et->et_ci, bh);
                         continue;
                 }
 
@@ -2572,11 +2661,12 @@ static void ocfs2_unlink_path(struct inode *inode, handle_t *handle,
                 if (ret)
                         mlog_errno(ret);
 
-                ocfs2_remove_from_cache(inode, bh);
+                ocfs2_remove_from_cache(et->et_ci, bh);
         }
 }
 
-static void ocfs2_unlink_subtree(struct inode *inode, handle_t *handle,
+static void ocfs2_unlink_subtree(handle_t *handle,
+                                 struct ocfs2_extent_tree *et,
                                  struct ocfs2_path *left_path,
                                  struct ocfs2_path *right_path,
                                  int subtree_index,
@@ -2607,17 +2697,17 @@ static void ocfs2_unlink_subtree(struct inode *inode, handle_t *handle,
         ocfs2_journal_dirty(handle, root_bh);
         ocfs2_journal_dirty(handle, path_leaf_bh(left_path));
 
-        ocfs2_unlink_path(inode, handle, dealloc, right_path,
+        ocfs2_unlink_path(handle, et, dealloc, right_path,
                           subtree_index + 1);
 }
 
-static int ocfs2_rotate_subtree_left(struct inode *inode, handle_t *handle,
+static int ocfs2_rotate_subtree_left(handle_t *handle,
+                                     struct ocfs2_extent_tree *et,
                                      struct ocfs2_path *left_path,
                                      struct ocfs2_path *right_path,
                                      int subtree_index,
                                      struct ocfs2_cached_dealloc_ctxt *dealloc,
-                                     int *deleted,
-                                     struct ocfs2_extent_tree *et)
+                                     int *deleted)
 {
         int ret, i, del_right_subtree = 0, right_has_empty = 0;
         struct buffer_head *root_bh, *et_root_bh = path_root_bh(right_path);
@@ -2653,7 +2743,7 @@ static int ocfs2_rotate_subtree_left(struct inode *inode, handle_t *handle,
                         return -EAGAIN;
 
                 if (le16_to_cpu(right_leaf_el->l_next_free_rec) > 1) {
-                        ret = ocfs2_journal_access_eb(handle, inode,
+                        ret = ocfs2_journal_access_eb(handle, et->et_ci,
                                                       path_leaf_bh(right_path),
                                                       OCFS2_JOURNAL_ACCESS_WRITE);
                         if (ret) {
@@ -2672,7 +2762,7 @@ static int ocfs2_rotate_subtree_left(struct inode *inode, handle_t *handle,
                  * We have to update i_last_eb_blk during the meta
                  * data delete.
                  */
-                ret = ocfs2_et_root_journal_access(handle, inode, et,
+                ret = ocfs2_et_root_journal_access(handle, et,
                                                    OCFS2_JOURNAL_ACCESS_WRITE);
                 if (ret) {
                         mlog_errno(ret);
@@ -2688,7 +2778,7 @@ static int ocfs2_rotate_subtree_left(struct inode *inode, handle_t *handle,
          */
         BUG_ON(right_has_empty && !del_right_subtree);
 
-        ret = ocfs2_path_bh_journal_access(handle, inode, right_path,
+        ret = ocfs2_path_bh_journal_access(handle, et->et_ci, right_path,
                                            subtree_index);
         if (ret) {
                 mlog_errno(ret);
@@ -2696,14 +2786,14 @@ static int ocfs2_rotate_subtree_left(struct inode *inode, handle_t *handle,
         }
 
         for(i = subtree_index + 1; i < path_num_items(right_path); i++) {
-                ret = ocfs2_path_bh_journal_access(handle, inode,
+                ret = ocfs2_path_bh_journal_access(handle, et->et_ci,
                                                    right_path, i);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
                 }
 
-                ret = ocfs2_path_bh_journal_access(handle, inode,
+                ret = ocfs2_path_bh_journal_access(handle, et->et_ci,
                                                    left_path, i);
                 if (ret) {
                         mlog_errno(ret);
@@ -2740,9 +2830,9 @@ static int ocfs2_rotate_subtree_left(struct inode *inode, handle_t *handle,
                 mlog_errno(ret);
 
         if (del_right_subtree) {
-                ocfs2_unlink_subtree(inode, handle, left_path, right_path,
+                ocfs2_unlink_subtree(handle, et, left_path, right_path,
                                      subtree_index, dealloc);
-                ret = ocfs2_update_edge_lengths(inode, handle, subtree_index,
+                ret = ocfs2_update_edge_lengths(handle, et, subtree_index,
                                                 left_path);
                 if (ret) {
                         mlog_errno(ret);
@@ -2766,7 +2856,7 @@ static int ocfs2_rotate_subtree_left(struct inode *inode, handle_t *handle,
 
                 *deleted = 1;
         } else
-                ocfs2_complete_edge_insert(inode, handle, left_path, right_path,
+                ocfs2_complete_edge_insert(handle, left_path, right_path,
                                            subtree_index);
 
 out:
@@ -2852,8 +2942,8 @@ out:
         return ret;
 }
 
-static int ocfs2_rotate_rightmost_leaf_left(struct inode *inode,
-                                            handle_t *handle,
+static int ocfs2_rotate_rightmost_leaf_left(handle_t *handle,
+                                            struct ocfs2_extent_tree *et,
                                             struct ocfs2_path *path)
 {
         int ret;
@@ -2863,7 +2953,7 @@ static int ocfs2_rotate_rightmost_leaf_left(struct inode *inode,
         if (!ocfs2_is_empty_extent(&el->l_recs[0]))
                 return 0;
 
-        ret = ocfs2_path_bh_journal_access(handle, inode, path,
+        ret = ocfs2_path_bh_journal_access(handle, et->et_ci, path,
                                            path_num_items(path) - 1);
         if (ret) {
                 mlog_errno(ret);
@@ -2880,24 +2970,24 @@ out:
         return ret;
 }
 
-static int __ocfs2_rotate_tree_left(struct inode *inode,
-                                    handle_t *handle, int orig_credits,
+static int __ocfs2_rotate_tree_left(handle_t *handle,
+                                    struct ocfs2_extent_tree *et,
+                                    int orig_credits,
                                     struct ocfs2_path *path,
                                     struct ocfs2_cached_dealloc_ctxt *dealloc,
-                                    struct ocfs2_path **empty_extent_path,
-                                    struct ocfs2_extent_tree *et)
+                                    struct ocfs2_path **empty_extent_path)
 {
         int ret, subtree_root, deleted;
         u32 right_cpos;
         struct ocfs2_path *left_path = NULL;
         struct ocfs2_path *right_path = NULL;
+        struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci);
 
         BUG_ON(!ocfs2_is_empty_extent(&(path_leaf_el(path)->l_recs[0])));
 
         *empty_extent_path = NULL;
 
-        ret = ocfs2_find_cpos_for_right_leaf(inode->i_sb, path,
-                                             &right_cpos);
+        ret = ocfs2_find_cpos_for_right_leaf(sb, path, &right_cpos);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -2920,13 +3010,13 @@ static int __ocfs2_rotate_tree_left(struct inode *inode,
         }
 
         while (right_cpos) {
-                ret = ocfs2_find_path(inode, right_path, right_cpos);
+                ret = ocfs2_find_path(et->et_ci, right_path, right_cpos);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
                 }
 
-                subtree_root = ocfs2_find_subtree_root(inode, left_path,
+                subtree_root = ocfs2_find_subtree_root(et, left_path,
                                                        right_path);
 
                 mlog(0, "Subtree root at index %d (blk %llu, depth %d)\n",
@@ -2946,16 +3036,16 @@ static int __ocfs2_rotate_tree_left(struct inode *inode,
                  * Caller might still want to make changes to the
                  * tree root, so re-add it to the journal here.
                  */
-                ret = ocfs2_path_bh_journal_access(handle, inode,
+                ret = ocfs2_path_bh_journal_access(handle, et->et_ci,
                                                    left_path, 0);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
                 }
 
-                ret = ocfs2_rotate_subtree_left(inode, handle, left_path,
+                ret = ocfs2_rotate_subtree_left(handle, et, left_path,
                                                 right_path, subtree_root,
-                                                dealloc, &deleted, et);
+                                                dealloc, &deleted);
                 if (ret == -EAGAIN) {
                         /*
                          * The rotation has to temporarily stop due to
@@ -2982,7 +3072,7 @@ static int __ocfs2_rotate_tree_left(struct inode *inode,
 
                 ocfs2_mv_path(left_path, right_path);
 
-                ret = ocfs2_find_cpos_for_right_leaf(inode->i_sb, left_path,
+                ret = ocfs2_find_cpos_for_right_leaf(sb, left_path,
                                                      &right_cpos);
                 if (ret) {
                         mlog_errno(ret);
@@ -2997,10 +3087,10 @@ out:
         return ret;
 }
 
-static int ocfs2_remove_rightmost_path(struct inode *inode, handle_t *handle,
+static int ocfs2_remove_rightmost_path(handle_t *handle,
+                                struct ocfs2_extent_tree *et,
                                 struct ocfs2_path *path,
-                                struct ocfs2_cached_dealloc_ctxt *dealloc,
-                                struct ocfs2_extent_tree *et)
+                                struct ocfs2_cached_dealloc_ctxt *dealloc)
 {
         int ret, subtree_index;
         u32 cpos;
@@ -3009,7 +3099,7 @@ static int ocfs2_remove_rightmost_path(struct inode *inode, handle_t *handle,
         struct ocfs2_extent_list *el;
 
 
-        ret = ocfs2_et_sanity_check(inode, et);
+        ret = ocfs2_et_sanity_check(et);
         if (ret)
                 goto out;
         /*
@@ -3024,13 +3114,14 @@ static int ocfs2_remove_rightmost_path(struct inode *inode, handle_t *handle,
                 goto out;
         }
 
-        ret = ocfs2_journal_access_path(inode, handle, path);
+        ret = ocfs2_journal_access_path(et->et_ci, handle, path);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
         }
 
-        ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb, path, &cpos);
+        ret = ocfs2_find_cpos_for_left_leaf(ocfs2_metadata_cache_get_super(et->et_ci),
+                                            path, &cpos);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -3048,23 +3139,23 @@ static int ocfs2_remove_rightmost_path(struct inode *inode, handle_t *handle,
                         goto out;
                 }
 
-                ret = ocfs2_find_path(inode, left_path, cpos);
+                ret = ocfs2_find_path(et->et_ci, left_path, cpos);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
                 }
 
-                ret = ocfs2_journal_access_path(inode, handle, left_path);
+                ret = ocfs2_journal_access_path(et->et_ci, handle, left_path);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
                 }
 
-                subtree_index = ocfs2_find_subtree_root(inode, left_path, path);
+                subtree_index = ocfs2_find_subtree_root(et, left_path, path);
 
-                ocfs2_unlink_subtree(inode, handle, left_path, path,
+                ocfs2_unlink_subtree(handle, et, left_path, path,
                                      subtree_index, dealloc);
-                ret = ocfs2_update_edge_lengths(inode, handle, subtree_index,
+                ret = ocfs2_update_edge_lengths(handle, et, subtree_index,
                                                 left_path);
                 if (ret) {
                         mlog_errno(ret);
@@ -3078,10 +3169,10 @@ static int ocfs2_remove_rightmost_path(struct inode *inode, handle_t *handle,
                  * 'path' is also the leftmost path which
                  * means it must be the only one. This gets
                  * handled differently because we want to
-                 * revert the inode back to having extents
+                 * revert the root back to having extents
                  * in-line.
                  */
-                ocfs2_unlink_path(inode, handle, dealloc, path, 1);
+                ocfs2_unlink_path(handle, et, dealloc, path, 1);
 
                 el = et->et_root_el;
                 el->l_tree_depth = 0;
@@ -3114,10 +3205,10 @@ out:
  * the rightmost tree leaf record is removed so the caller is
  * responsible for detecting and correcting that.
  */
-static int ocfs2_rotate_tree_left(struct inode *inode, handle_t *handle,
+static int ocfs2_rotate_tree_left(handle_t *handle,
+                                  struct ocfs2_extent_tree *et,
                                   struct ocfs2_path *path,
-                                  struct ocfs2_cached_dealloc_ctxt *dealloc,
-                                  struct ocfs2_extent_tree *et)
+                                  struct ocfs2_cached_dealloc_ctxt *dealloc)
 {
         int ret, orig_credits = handle->h_buffer_credits;
         struct ocfs2_path *tmp_path = NULL, *restart_path = NULL;
@@ -3134,8 +3225,7 @@ rightmost_no_delete:
                  * Inline extents. This is trivially handled, so do
                  * it up front.
                  */
-                ret = ocfs2_rotate_rightmost_leaf_left(inode, handle,
-                                                       path);
+                ret = ocfs2_rotate_rightmost_leaf_left(handle, et, path);
                 if (ret)
                         mlog_errno(ret);
                 goto out;
@@ -3151,7 +3241,7 @@ rightmost_no_delete:
          *
          *  1) is handled via ocfs2_rotate_rightmost_leaf_left()
          *  2a) we need the left branch so that we can update it with the unlink
-         *  2b) we need to bring the inode back to inline extents.
+         *  2b) we need to bring the root back to inline extents.
          */
 
         eb = (struct ocfs2_extent_block *)path_leaf_bh(path)->b_data;
@@ -3167,9 +3257,9 @@ rightmost_no_delete:
 
                 if (le16_to_cpu(el->l_next_free_rec) == 0) {
                         ret = -EIO;
-                        ocfs2_error(inode->i_sb,
-                                    "Inode %llu has empty extent block at %llu",
-                                    (unsigned long long)OCFS2_I(inode)->ip_blkno,
+                        ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci),
+                                    "Owner %llu has empty extent block at %llu",
+                                    (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci),
                                     (unsigned long long)le64_to_cpu(eb->h_blkno));
                         goto out;
                 }
@@ -3183,8 +3273,8 @@ rightmost_no_delete:
                  * nonempty list.
                  */
 
-                ret = ocfs2_remove_rightmost_path(inode, handle, path,
-                                                  dealloc, et);
+                ret = ocfs2_remove_rightmost_path(handle, et, path,
+                                                  dealloc);
                 if (ret)
                         mlog_errno(ret);
                 goto out;
@@ -3195,8 +3285,8 @@ rightmost_no_delete:
          * and restarting from there.
          */
 try_rotate:
-        ret = __ocfs2_rotate_tree_left(inode, handle, orig_credits, path,
-                                       dealloc, &restart_path, et);
+        ret = __ocfs2_rotate_tree_left(handle, et, orig_credits, path,
+                                       dealloc, &restart_path);
         if (ret && ret != -EAGAIN) {
                 mlog_errno(ret);
                 goto out;
@@ -3206,9 +3296,9 @@ try_rotate:
                 tmp_path = restart_path;
                 restart_path = NULL;
 
-                ret = __ocfs2_rotate_tree_left(inode, handle, orig_credits,
+                ret = __ocfs2_rotate_tree_left(handle, et, orig_credits,
                                                tmp_path, dealloc,
-                                               &restart_path, et);
+                                               &restart_path);
                 if (ret && ret != -EAGAIN) {
                         mlog_errno(ret);
                         goto out;
@@ -3259,7 +3349,7 @@ static void ocfs2_cleanup_merge(struct ocfs2_extent_list *el,
         }
 }
 
-static int ocfs2_get_right_path(struct inode *inode,
+static int ocfs2_get_right_path(struct ocfs2_extent_tree *et,
                                 struct ocfs2_path *left_path,
                                 struct ocfs2_path **ret_right_path)
 {
@@ -3276,8 +3366,8 @@ static int ocfs2_get_right_path(struct inode *inode,
         left_el = path_leaf_el(left_path);
         BUG_ON(left_el->l_next_free_rec != left_el->l_count);
 
-        ret = ocfs2_find_cpos_for_right_leaf(inode->i_sb, left_path,
-                                             &right_cpos);
+        ret = ocfs2_find_cpos_for_right_leaf(ocfs2_metadata_cache_get_super(et->et_ci),
+                                             left_path, &right_cpos);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -3293,7 +3383,7 @@ static int ocfs2_get_right_path(struct inode *inode,
                 goto out;
         }
 
-        ret = ocfs2_find_path(inode, right_path, right_cpos);
+        ret = ocfs2_find_path(et->et_ci, right_path, right_cpos);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -3313,9 +3403,9 @@ out:
  * For index == l_count - 1, the "next" means the 1st extent rec of the
  * next extent block.
  */
-static int ocfs2_merge_rec_right(struct inode *inode,
-                                 struct ocfs2_path *left_path,
+static int ocfs2_merge_rec_right(struct ocfs2_path *left_path,
                                  handle_t *handle,
+                                 struct ocfs2_extent_tree *et,
                                  struct ocfs2_extent_rec *split_rec,
                                  int index)
 {
@@ -3336,7 +3426,7 @@ static int ocfs2_merge_rec_right(struct inode *inode,
         if (index == le16_to_cpu(el->l_next_free_rec) - 1 &&
             le16_to_cpu(el->l_next_free_rec) == le16_to_cpu(el->l_count)) {
                 /* we meet with a cross extent block merge. */
-                ret = ocfs2_get_right_path(inode, left_path, &right_path);
+                ret = ocfs2_get_right_path(et, left_path, &right_path);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -3355,8 +3445,8 @@ static int ocfs2_merge_rec_right(struct inode *inode,
                        le16_to_cpu(left_rec->e_leaf_clusters) !=
                        le32_to_cpu(right_rec->e_cpos));
 
-                subtree_index = ocfs2_find_subtree_root(inode,
-                                                        left_path, right_path);
+                subtree_index = ocfs2_find_subtree_root(et, left_path,
+                                                        right_path);
 
                 ret = ocfs2_extend_rotate_transaction(handle, subtree_index,
                                                       handle->h_buffer_credits,
@@ -3369,7 +3459,7 @@ static int ocfs2_merge_rec_right(struct inode *inode,
                 root_bh = left_path->p_node[subtree_index].bh;
                 BUG_ON(root_bh != right_path->p_node[subtree_index].bh);
 
-                ret = ocfs2_path_bh_journal_access(handle, inode, right_path,
+                ret = ocfs2_path_bh_journal_access(handle, et->et_ci, right_path,
                                                    subtree_index);
                 if (ret) {
                         mlog_errno(ret);
@@ -3378,14 +3468,14 @@ static int ocfs2_merge_rec_right(struct inode *inode,
 
                 for (i = subtree_index + 1;
                      i < path_num_items(right_path); i++) {
-                        ret = ocfs2_path_bh_journal_access(handle, inode,
+                        ret = ocfs2_path_bh_journal_access(handle, et->et_ci,
                                                            right_path, i);
                         if (ret) {
                                 mlog_errno(ret);
                                 goto out;
                         }
 
-                        ret = ocfs2_path_bh_journal_access(handle, inode,
+                        ret = ocfs2_path_bh_journal_access(handle, et->et_ci,
                                                            left_path, i);
                         if (ret) {
                                 mlog_errno(ret);
@@ -3398,7 +3488,7 @@ static int ocfs2_merge_rec_right(struct inode *inode,
                 right_rec = &el->l_recs[index + 1];
         }
 
-        ret = ocfs2_path_bh_journal_access(handle, inode, left_path,
+        ret = ocfs2_path_bh_journal_access(handle, et->et_ci, left_path,
                                            path_num_items(left_path) - 1);
         if (ret) {
                 mlog_errno(ret);
@@ -3409,7 +3499,8 @@ static int ocfs2_merge_rec_right(struct inode *inode,
 
         le32_add_cpu(&right_rec->e_cpos, -split_clusters);
         le64_add_cpu(&right_rec->e_blkno,
-                     -ocfs2_clusters_to_blocks(inode->i_sb, split_clusters));
+                     -ocfs2_clusters_to_blocks(ocfs2_metadata_cache_get_super(et->et_ci),
+                                               split_clusters));
         le16_add_cpu(&right_rec->e_leaf_clusters, split_clusters);
 
         ocfs2_cleanup_merge(el, index);
@@ -3423,8 +3514,8 @@ static int ocfs2_merge_rec_right(struct inode *inode,
                 if (ret)
                         mlog_errno(ret);
 
-                ocfs2_complete_edge_insert(inode, handle, left_path,
-                                           right_path, subtree_index);
+                ocfs2_complete_edge_insert(handle, left_path, right_path,
+                                           subtree_index);
         }
 out:
         if (right_path)
@@ -3432,7 +3523,7 @@ out:
         return ret;
 }
 
-static int ocfs2_get_left_path(struct inode *inode,
+static int ocfs2_get_left_path(struct ocfs2_extent_tree *et,
                                struct ocfs2_path *right_path,
                                struct ocfs2_path **ret_left_path)
 {
@@ -3445,7 +3536,7 @@ static int ocfs2_get_left_path(struct inode *inode,
         /* This function shouldn't be called for non-trees. */
         BUG_ON(right_path->p_tree_depth == 0);
 
-        ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb,
+        ret = ocfs2_find_cpos_for_left_leaf(ocfs2_metadata_cache_get_super(et->et_ci),
                                             right_path, &left_cpos);
         if (ret) {
                 mlog_errno(ret);
@@ -3462,7 +3553,7 @@ static int ocfs2_get_left_path(struct inode *inode,
                 goto out;
         }
 
-        ret = ocfs2_find_path(inode, left_path, left_cpos);
+        ret = ocfs2_find_path(et->et_ci, left_path, left_cpos);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -3485,12 +3576,11 @@ out:
  * remove the rightmost leaf extent block in the right_path and change
  * the right path to indicate the new rightmost path.
  */
-static int ocfs2_merge_rec_left(struct inode *inode,
-                                struct ocfs2_path *right_path,
+static int ocfs2_merge_rec_left(struct ocfs2_path *right_path,
                                 handle_t *handle,
+                                struct ocfs2_extent_tree *et,
                                 struct ocfs2_extent_rec *split_rec,
                                 struct ocfs2_cached_dealloc_ctxt *dealloc,
-                                struct ocfs2_extent_tree *et,
                                 int index)
 {
         int ret, i, subtree_index = 0, has_empty_extent = 0;
@@ -3508,7 +3598,7 @@ static int ocfs2_merge_rec_left(struct inode *inode,
         right_rec = &el->l_recs[index];
         if (index == 0) {
                 /* we meet with a cross extent block merge. */
-                ret = ocfs2_get_left_path(inode, right_path, &left_path);
+                ret = ocfs2_get_left_path(et, right_path, &left_path);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -3524,8 +3614,8 @@ static int ocfs2_merge_rec_left(struct inode *inode,
                        le16_to_cpu(left_rec->e_leaf_clusters) !=
                        le32_to_cpu(split_rec->e_cpos));
 
-                subtree_index = ocfs2_find_subtree_root(inode,
-                                                        left_path, right_path);
+                subtree_index = ocfs2_find_subtree_root(et, left_path,
+                                                        right_path);
 
                 ret = ocfs2_extend_rotate_transaction(handle, subtree_index,
                                                       handle->h_buffer_credits,
@@ -3538,7 +3628,7 @@ static int ocfs2_merge_rec_left(struct inode *inode,
                 root_bh = left_path->p_node[subtree_index].bh;
                 BUG_ON(root_bh != right_path->p_node[subtree_index].bh);
 
-                ret = ocfs2_path_bh_journal_access(handle, inode, right_path,
+                ret = ocfs2_path_bh_journal_access(handle, et->et_ci, right_path,
                                                    subtree_index);
                 if (ret) {
                         mlog_errno(ret);
@@ -3547,14 +3637,14 @@ static int ocfs2_merge_rec_left(struct inode *inode,
 
                 for (i = subtree_index + 1;
                      i < path_num_items(right_path); i++) {
-                        ret = ocfs2_path_bh_journal_access(handle, inode,
+                        ret = ocfs2_path_bh_journal_access(handle, et->et_ci,
                                                            right_path, i);
                         if (ret) {
                                 mlog_errno(ret);
                                 goto out;
                         }
 
-                        ret = ocfs2_path_bh_journal_access(handle, inode,
+                        ret = ocfs2_path_bh_journal_access(handle, et->et_ci,
                                                            left_path, i);
                         if (ret) {
                                 mlog_errno(ret);
@@ -3567,7 +3657,7 @@ static int ocfs2_merge_rec_left(struct inode *inode,
                         has_empty_extent = 1;
         }
 
-        ret = ocfs2_path_bh_journal_access(handle, inode, right_path,
+        ret = ocfs2_path_bh_journal_access(handle, et->et_ci, right_path,
                                            path_num_items(right_path) - 1);
         if (ret) {
                 mlog_errno(ret);
@@ -3586,7 +3676,8 @@ static int ocfs2_merge_rec_left(struct inode *inode,
 
         le32_add_cpu(&right_rec->e_cpos, split_clusters);
         le64_add_cpu(&right_rec->e_blkno,
-                     ocfs2_clusters_to_blocks(inode->i_sb, split_clusters));
+                     ocfs2_clusters_to_blocks(ocfs2_metadata_cache_get_super(et->et_ci),
+                                              split_clusters));
         le16_add_cpu(&right_rec->e_leaf_clusters, -split_clusters);
 
         ocfs2_cleanup_merge(el, index);
@@ -3608,9 +3699,9 @@ static int ocfs2_merge_rec_left(struct inode *inode,
                 if (le16_to_cpu(right_rec->e_leaf_clusters) == 0 &&
                     le16_to_cpu(el->l_next_free_rec) == 1) {
 
-                        ret = ocfs2_remove_rightmost_path(inode, handle,
+                        ret = ocfs2_remove_rightmost_path(handle, et,
                                                           right_path,
-                                                          dealloc, et);
+                                                          dealloc);
                         if (ret) {
                                 mlog_errno(ret);
                                 goto out;
@@ -3622,7 +3713,7 @@ static int ocfs2_merge_rec_left(struct inode *inode,
                         ocfs2_mv_path(right_path, left_path);
                         left_path = NULL;
                 } else
-                        ocfs2_complete_edge_insert(inode, handle, left_path,
+                        ocfs2_complete_edge_insert(handle, left_path,
                                                    right_path, subtree_index);
         }
 out:
@@ -3631,15 +3722,13 @@ out:
         return ret;
 }
 
-static int ocfs2_try_to_merge_extent(struct inode *inode,
-                                     handle_t *handle,
+static int ocfs2_try_to_merge_extent(handle_t *handle,
+                                     struct ocfs2_extent_tree *et,
                                      struct ocfs2_path *path,
                                      int split_index,
                                      struct ocfs2_extent_rec *split_rec,
                                      struct ocfs2_cached_dealloc_ctxt *dealloc,
-                                     struct ocfs2_merge_ctxt *ctxt,
-                                     struct ocfs2_extent_tree *et)
-
+                                     struct ocfs2_merge_ctxt *ctxt)
 {
         int ret = 0;
         struct ocfs2_extent_list *el = path_leaf_el(path);
@@ -3655,8 +3744,7 @@ static int ocfs2_try_to_merge_extent(struct inode *inode,
                  * extents - having more than one in a leaf is
                  * illegal.
                  */
-                ret = ocfs2_rotate_tree_left(inode, handle, path,
-                                             dealloc, et);
+                ret = ocfs2_rotate_tree_left(handle, et, path, dealloc);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -3685,8 +3773,7 @@ static int ocfs2_try_to_merge_extent(struct inode *inode,
                  * prevoius extent block. It is more efficient and easier
                  * if we do merge_right first and merge_left later.
                  */
-                ret = ocfs2_merge_rec_right(inode, path,
-                                            handle, split_rec,
+                ret = ocfs2_merge_rec_right(path, handle, et, split_rec,
                                             split_index);
                 if (ret) {
                         mlog_errno(ret);
@@ -3699,8 +3786,7 @@ static int ocfs2_try_to_merge_extent(struct inode *inode,
                 BUG_ON(!ocfs2_is_empty_extent(&el->l_recs[0]));
 
                 /* The merge left us with an empty extent, remove it. */
-                ret = ocfs2_rotate_tree_left(inode, handle, path,
-                                             dealloc, et);
+                ret = ocfs2_rotate_tree_left(handle, et, path, dealloc);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -3712,18 +3798,15 @@ static int ocfs2_try_to_merge_extent(struct inode *inode,
                  * Note that we don't pass split_rec here on purpose -
                  * we've merged it into the rec already.
                  */
-                ret = ocfs2_merge_rec_left(inode, path,
-                                           handle, rec,
-                                           dealloc, et,
-                                           split_index);
+                ret = ocfs2_merge_rec_left(path, handle, et, rec,
+                                           dealloc, split_index);
 
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
                 }
 
-                ret = ocfs2_rotate_tree_left(inode, handle, path,
-                                             dealloc, et);
+                ret = ocfs2_rotate_tree_left(handle, et, path, dealloc);
                 /*
                  * Error from this last rotate is not critical, so
                  * print but don't bubble it up.
@@ -3740,19 +3823,16 @@ static int ocfs2_try_to_merge_extent(struct inode *inode,
                  * the record on the left (hence the left merge).
                  */
                 if (ctxt->c_contig_type == CONTIG_RIGHT) {
-                        ret = ocfs2_merge_rec_left(inode,
-                                                   path,
-                                                   handle, split_rec,
-                                                   dealloc, et,
+                        ret = ocfs2_merge_rec_left(path, handle, et,
+                                                   split_rec, dealloc,
                                                    split_index);
                         if (ret) {
                                 mlog_errno(ret);
                                 goto out;
                         }
                 } else {
-                        ret = ocfs2_merge_rec_right(inode,
-                                                    path,
-                                                    handle, split_rec,
+                        ret = ocfs2_merge_rec_right(path, handle,
+                                                    et, split_rec,
                                                     split_index);
                         if (ret) {
                                 mlog_errno(ret);
@@ -3765,8 +3845,8 @@ static int ocfs2_try_to_merge_extent(struct inode *inode,
                          * The merge may have left an empty extent in
                          * our leaf. Try to rotate it away.
                          */
-                        ret = ocfs2_rotate_tree_left(inode, handle, path,
-                                                     dealloc, et);
+                        ret = ocfs2_rotate_tree_left(handle, et, path,
+                                                     dealloc);
                         if (ret)
                                 mlog_errno(ret);
                         ret = 0;
@@ -3812,10 +3892,10 @@ static void ocfs2_subtract_from_rec(struct super_block *sb,
  * list. If this leaf is part of an allocation tree, it is assumed
  * that the tree above has been prepared.
  */
-static void ocfs2_insert_at_leaf(struct ocfs2_extent_rec *insert_rec,
+static void ocfs2_insert_at_leaf(struct ocfs2_extent_tree *et,
+                                 struct ocfs2_extent_rec *insert_rec,
                                  struct ocfs2_extent_list *el,
-                                 struct ocfs2_insert_type *insert,
-                                 struct inode *inode)
+                                 struct ocfs2_insert_type *insert)
 {
         int i = insert->ins_contig_index;
         unsigned int range;
@@ -3827,7 +3907,8 @@ static void ocfs2_insert_at_leaf(struct ocfs2_extent_rec *insert_rec,
                 i = ocfs2_search_extent_list(el, le32_to_cpu(insert_rec->e_cpos));
                 BUG_ON(i == -1);
                 rec = &el->l_recs[i];
-                ocfs2_subtract_from_rec(inode->i_sb, insert->ins_split, rec,
+                ocfs2_subtract_from_rec(ocfs2_metadata_cache_get_super(et->et_ci),
+                                        insert->ins_split, rec,
                                         insert_rec);
                 goto rotate;
         }
@@ -3869,10 +3950,10 @@ static void ocfs2_insert_at_leaf(struct ocfs2_extent_rec *insert_rec,
 
                 mlog_bug_on_msg(le16_to_cpu(el->l_next_free_rec) >=
                                 le16_to_cpu(el->l_count),
-                                "inode %lu, depth %u, count %u, next free %u, "
+                                "owner %llu, depth %u, count %u, next free %u, "
                                 "rec.cpos %u, rec.clusters %u, "
                                 "insert.cpos %u, insert.clusters %u\n",
-                                inode->i_ino,
+                                ocfs2_metadata_cache_owner(et->et_ci),
                                 le16_to_cpu(el->l_tree_depth),
                                 le16_to_cpu(el->l_count),
                                 le16_to_cpu(el->l_next_free_rec),
@@ -3900,8 +3981,8 @@ rotate:
         ocfs2_rotate_leaf(el, insert_rec);
 }
 
-static void ocfs2_adjust_rightmost_records(struct inode *inode,
-                                           handle_t *handle,
+static void ocfs2_adjust_rightmost_records(handle_t *handle,
+                                           struct ocfs2_extent_tree *et,
                                            struct ocfs2_path *path,
                                            struct ocfs2_extent_rec *insert_rec)
 {
@@ -3919,9 +4000,9 @@ static void ocfs2_adjust_rightmost_records(struct inode *inode,
 
                 next_free = le16_to_cpu(el->l_next_free_rec);
                 if (next_free == 0) {
-                        ocfs2_error(inode->i_sb,
-                                    "Dinode %llu has a bad extent list",
-                                    (unsigned long long)OCFS2_I(inode)->ip_blkno);
+                        ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci),
+                                    "Owner %llu has a bad extent list",
+                                    (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci));
                         ret = -EIO;
                         return;
                 }
@@ -3941,7 +4022,8 @@ static void ocfs2_adjust_rightmost_records(struct inode *inode,
         }
 }
 
-static int ocfs2_append_rec_to_path(struct inode *inode, handle_t *handle,
+static int ocfs2_append_rec_to_path(handle_t *handle,
+                                    struct ocfs2_extent_tree *et,
                                     struct ocfs2_extent_rec *insert_rec,
                                     struct ocfs2_path *right_path,
                                     struct ocfs2_path **ret_left_path)
@@ -3969,8 +4051,8 @@ static int ocfs2_append_rec_to_path(struct inode *inode, handle_t *handle,
             (next_free == 1 && ocfs2_is_empty_extent(&el->l_recs[0]))) {
                 u32 left_cpos;
 
-                ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb, right_path,
-                                                    &left_cpos);
+                ret = ocfs2_find_cpos_for_left_leaf(ocfs2_metadata_cache_get_super(et->et_ci),
+                                                    right_path, &left_cpos);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -3992,7 +4074,8 @@ static int ocfs2_append_rec_to_path(struct inode *inode, handle_t *handle,
                                 goto out;
                         }
 
-                        ret = ocfs2_find_path(inode, left_path, left_cpos);
+                        ret = ocfs2_find_path(et->et_ci, left_path,
+                                              left_cpos);
                         if (ret) {
                                 mlog_errno(ret);
                                 goto out;
@@ -4005,13 +4088,13 @@ static int ocfs2_append_rec_to_path(struct inode *inode, handle_t *handle,
                 }
         }
 
-        ret = ocfs2_journal_access_path(inode, handle, right_path);
+        ret = ocfs2_journal_access_path(et->et_ci, handle, right_path);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
         }
 
-        ocfs2_adjust_rightmost_records(inode, handle, right_path, insert_rec);
+        ocfs2_adjust_rightmost_records(handle, et, right_path, insert_rec);
 
         *ret_left_path = left_path;
         ret = 0;
@@ -4022,7 +4105,7 @@ out:
         return ret;
 }
 
-static void ocfs2_split_record(struct inode *inode,
+static void ocfs2_split_record(struct ocfs2_extent_tree *et,
                                struct ocfs2_path *left_path,
                                struct ocfs2_path *right_path,
                                struct ocfs2_extent_rec *split_rec,
@@ -4095,7 +4178,8 @@ static void ocfs2_split_record(struct inode *inode,
         }
 
         rec = &el->l_recs[index];
-        ocfs2_subtract_from_rec(inode->i_sb, split, rec, split_rec);
+        ocfs2_subtract_from_rec(ocfs2_metadata_cache_get_super(et->et_ci),
+                                split, rec, split_rec);
         ocfs2_rotate_leaf(insert_el, split_rec);
 }
 
@@ -4107,8 +4191,8 @@ static void ocfs2_split_record(struct inode *inode,
  * in. left_path should only be passed in if we need to update that
  * portion of the tree after an edge insert.
  */
-static int ocfs2_insert_path(struct inode *inode,
-                             handle_t *handle,
+static int ocfs2_insert_path(handle_t *handle,
+                             struct ocfs2_extent_tree *et,
                              struct ocfs2_path *left_path,
                              struct ocfs2_path *right_path,
                              struct ocfs2_extent_rec *insert_rec,
@@ -4134,7 +4218,7 @@ static int ocfs2_insert_path(struct inode *inode,
                         goto out;
                 }
 
-                ret = ocfs2_journal_access_path(inode, handle, left_path);
+                ret = ocfs2_journal_access_path(et->et_ci, handle, left_path);
                 if (ret < 0) {
                         mlog_errno(ret);
                         goto out;
@@ -4145,7 +4229,7 @@ static int ocfs2_insert_path(struct inode *inode,
          * Pass both paths to the journal. The majority of inserts
          * will be touching all components anyway.
          */
-        ret = ocfs2_journal_access_path(inode, handle, right_path);
+        ret = ocfs2_journal_access_path(et->et_ci, handle, right_path);
         if (ret < 0) {
                 mlog_errno(ret);
                 goto out;
@@ -4157,7 +4241,7 @@ static int ocfs2_insert_path(struct inode *inode,
                  * of splits, but it's easier to just let one separate
                  * function sort it all out.
                  */
-                ocfs2_split_record(inode, left_path, right_path,
+                ocfs2_split_record(et, left_path, right_path,
                                    insert_rec, insert->ins_split);
 
                 /*
@@ -4171,8 +4255,8 @@ static int ocfs2_insert_path(struct inode *inode,
                         if (ret)
                                 mlog_errno(ret);
         } else
-                ocfs2_insert_at_leaf(insert_rec, path_leaf_el(right_path),
-                                     insert, inode);
+                ocfs2_insert_at_leaf(et, insert_rec, path_leaf_el(right_path),
+                                     insert);
 
         ret = ocfs2_journal_dirty(handle, leaf_bh);
         if (ret)
@@ -4185,10 +4269,10 @@ static int ocfs2_insert_path(struct inode *inode,
                  *
                  * XXX: Should we extend the transaction here?
                  */
-                subtree_index = ocfs2_find_subtree_root(inode, left_path,
+                subtree_index = ocfs2_find_subtree_root(et, left_path,
                                                         right_path);
-                ocfs2_complete_edge_insert(inode, handle, left_path,
-                                           right_path, subtree_index);
+                ocfs2_complete_edge_insert(handle, left_path, right_path,
+                                           subtree_index);
         }
 
         ret = 0;
@@ -4196,8 +4280,7 @@ out:
         return ret;
 }
 
-static int ocfs2_do_insert_extent(struct inode *inode,
-                                  handle_t *handle,
+static int ocfs2_do_insert_extent(handle_t *handle,
                                   struct ocfs2_extent_tree *et,
                                   struct ocfs2_extent_rec *insert_rec,
                                   struct ocfs2_insert_type *type)
@@ -4210,7 +4293,7 @@ static int ocfs2_do_insert_extent(struct inode *inode,
 
         el = et->et_root_el;
 
-        ret = ocfs2_et_root_journal_access(handle, inode, et,
+        ret = ocfs2_et_root_journal_access(handle, et,
                                            OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
@@ -4218,7 +4301,7 @@ static int ocfs2_do_insert_extent(struct inode *inode,
         }
 
         if (le16_to_cpu(el->l_tree_depth) == 0) {
-                ocfs2_insert_at_leaf(insert_rec, el, type, inode);
+                ocfs2_insert_at_leaf(et, insert_rec, el, type);
                 goto out_update_clusters;
         }
 
@@ -4241,7 +4324,7 @@ static int ocfs2_do_insert_extent(struct inode *inode,
                 cpos = UINT_MAX;
         }
 
-        ret = ocfs2_find_path(inode, right_path, cpos);
+        ret = ocfs2_find_path(et->et_ci, right_path, cpos);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -4260,7 +4343,7 @@ static int ocfs2_do_insert_extent(struct inode *inode,
          * can wind up skipping both of these two special cases...
          */
         if (rotate) {
-                ret = ocfs2_rotate_tree_right(inode, handle, type->ins_split,
+                ret = ocfs2_rotate_tree_right(handle, et, type->ins_split,
                                               le32_to_cpu(insert_rec->e_cpos),
                                               right_path, &left_path);
                 if (ret) {
@@ -4272,7 +4355,7 @@ static int ocfs2_do_insert_extent(struct inode *inode,
                  * ocfs2_rotate_tree_right() might have extended the
                  * transaction without re-journaling our tree root.
                  */
-                ret = ocfs2_et_root_journal_access(handle, inode, et,
+                ret = ocfs2_et_root_journal_access(handle, et,
                                                    OCFS2_JOURNAL_ACCESS_WRITE);
                 if (ret) {
                         mlog_errno(ret);
@@ -4280,7 +4363,7 @@ static int ocfs2_do_insert_extent(struct inode *inode,
                 }
         } else if (type->ins_appending == APPEND_TAIL
                    && type->ins_contig != CONTIG_LEFT) {
-                ret = ocfs2_append_rec_to_path(inode, handle, insert_rec,
+                ret = ocfs2_append_rec_to_path(handle, et, insert_rec,
                                                right_path, &left_path);
                 if (ret) {
                         mlog_errno(ret);
@@ -4288,7 +4371,7 @@ static int ocfs2_do_insert_extent(struct inode *inode,
                 }
         }
 
-        ret = ocfs2_insert_path(inode, handle, left_path, right_path,
+        ret = ocfs2_insert_path(handle, et, left_path, right_path,
                                 insert_rec, type);
         if (ret) {
                 mlog_errno(ret);
@@ -4297,7 +4380,7 @@ static int ocfs2_do_insert_extent(struct inode *inode,
 
 out_update_clusters:
         if (type->ins_split == SPLIT_NONE)
-                ocfs2_et_update_clusters(inode, et,
+                ocfs2_et_update_clusters(et,
                                          le16_to_cpu(insert_rec->e_leaf_clusters));
 
         ret = ocfs2_journal_dirty(handle, et->et_root_bh);
@@ -4312,7 +4395,8 @@ out:
 }
 
 static enum ocfs2_contig_type
-ocfs2_figure_merge_contig_type(struct inode *inode, struct ocfs2_path *path,
+ocfs2_figure_merge_contig_type(struct ocfs2_extent_tree *et,
+                               struct ocfs2_path *path,
                                struct ocfs2_extent_list *el, int index,
                                struct ocfs2_extent_rec *split_rec)
 {
@@ -4324,12 +4408,12 @@ ocfs2_figure_merge_contig_type(struct inode *inode, struct ocfs2_path *path,
         struct ocfs2_path *left_path = NULL, *right_path = NULL;
         struct buffer_head *bh;
         struct ocfs2_extent_block *eb;
+        struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci);
 
         if (index > 0) {
                 rec = &el->l_recs[index - 1];
         } else if (path->p_tree_depth > 0) {
-                status = ocfs2_find_cpos_for_left_leaf(inode->i_sb,
-                                                       path, &left_cpos);
+                status = ocfs2_find_cpos_for_left_leaf(sb, path, &left_cpos);
                 if (status)
                         goto out;
 
@@ -4338,7 +4422,8 @@ ocfs2_figure_merge_contig_type(struct inode *inode, struct ocfs2_path *path,
                         if (!left_path)
                                 goto out;
 
-                        status = ocfs2_find_path(inode, left_path, left_cpos);
+                        status = ocfs2_find_path(et->et_ci, left_path,
+                                                 left_cpos);
                         if (status)
                                 goto out;
 
@@ -4348,7 +4433,7 @@ ocfs2_figure_merge_contig_type(struct inode *inode, struct ocfs2_path *path,
                             le16_to_cpu(new_el->l_count)) {
                                 bh = path_leaf_bh(left_path);
                                 eb = (struct ocfs2_extent_block *)bh->b_data;
-                                ocfs2_error(inode->i_sb,
+                                ocfs2_error(sb,
                                             "Extent block #%llu has an "
                                             "invalid l_next_free_rec of "
                                             "%d.  It should have "
@@ -4373,7 +4458,7 @@ ocfs2_figure_merge_contig_type(struct inode *inode, struct ocfs2_path *path,
                         if (split_rec->e_cpos == el->l_recs[index].e_cpos)
                                 ret = CONTIG_RIGHT;
                 } else {
-                        ret = ocfs2_extent_contig(inode, rec, split_rec);
+                        ret = ocfs2_et_extent_contig(et, rec, split_rec);
                 }
         }
 
@@ -4382,8 +4467,7 @@ ocfs2_figure_merge_contig_type(struct inode *inode, struct ocfs2_path *path,
                 rec = &el->l_recs[index + 1];
         else if (le16_to_cpu(el->l_next_free_rec) == le16_to_cpu(el->l_count) &&
                  path->p_tree_depth > 0) {
-                status = ocfs2_find_cpos_for_right_leaf(inode->i_sb,
-                                                        path, &right_cpos);
+                status = ocfs2_find_cpos_for_right_leaf(sb, path, &right_cpos);
                 if (status)
                         goto out;
 
@@ -4394,7 +4478,7 @@ ocfs2_figure_merge_contig_type(struct inode *inode, struct ocfs2_path *path,
                 if (!right_path)
                         goto out;
 
-                status = ocfs2_find_path(inode, right_path, right_cpos);
+                status = ocfs2_find_path(et->et_ci, right_path, right_cpos);
                 if (status)
                         goto out;
 
@@ -4404,7 +4488,7 @@ ocfs2_figure_merge_contig_type(struct inode *inode, struct ocfs2_path *path,
                         if (le16_to_cpu(new_el->l_next_free_rec) <= 1) {
                                 bh = path_leaf_bh(right_path);
                                 eb = (struct ocfs2_extent_block *)bh->b_data;
-                                ocfs2_error(inode->i_sb,
+                                ocfs2_error(sb,
                                             "Extent block #%llu has an "
                                             "invalid l_next_free_rec of %d",
                                             (unsigned long long)le64_to_cpu(eb->h_blkno),
@@ -4419,7 +4503,7 @@ ocfs2_figure_merge_contig_type(struct inode *inode, struct ocfs2_path *path,
         if (rec) {
                 enum ocfs2_contig_type contig_type;
 
-                contig_type = ocfs2_extent_contig(inode, rec, split_rec);
+                contig_type = ocfs2_et_extent_contig(et, rec, split_rec);
 
                 if (contig_type == CONTIG_LEFT && ret == CONTIG_RIGHT)
                         ret = CONTIG_LEFTRIGHT;
@@ -4436,11 +4520,10 @@ out:
         return ret;
 }
 
-static void ocfs2_figure_contig_type(struct inode *inode,
+static void ocfs2_figure_contig_type(struct ocfs2_extent_tree *et,
                                      struct ocfs2_insert_type *insert,
                                      struct ocfs2_extent_list *el,
-                                     struct ocfs2_extent_rec *insert_rec,
-                                     struct ocfs2_extent_tree *et)
+                                     struct ocfs2_extent_rec *insert_rec)
 {
         int i;
         enum ocfs2_contig_type contig_type = CONTIG_NONE;
@@ -4448,8 +4531,8 @@ static void ocfs2_figure_contig_type(struct inode *inode,
         BUG_ON(le16_to_cpu(el->l_tree_depth) != 0);
 
         for(i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
-                contig_type = ocfs2_extent_contig(inode, &el->l_recs[i],
-                                                  insert_rec);
+                contig_type = ocfs2_et_extent_contig(et, &el->l_recs[i],
+                                                     insert_rec);
                 if (contig_type != CONTIG_NONE) {
                         insert->ins_contig_index = i;
                         break;
@@ -4530,8 +4613,7 @@ set_tail_append:
  * All of the information is stored on the ocfs2_insert_type
  * structure.
  */
-static int ocfs2_figure_insert_type(struct inode *inode,
-                                    struct ocfs2_extent_tree *et,
+static int ocfs2_figure_insert_type(struct ocfs2_extent_tree *et,
                                     struct buffer_head **last_eb_bh,
                                     struct ocfs2_extent_rec *insert_rec,
                                     int *free_records,
@@ -4555,7 +4637,7 @@ static int ocfs2_figure_insert_type(struct inode *inode,
                  * ocfs2_figure_insert_type() and ocfs2_add_branch()
                  * may want it later.
                  */
-                ret = ocfs2_read_extent_block(inode,
+                ret = ocfs2_read_extent_block(et->et_ci,
                                               ocfs2_et_get_last_eb_blk(et),
                                               &bh);
                 if (ret) {
@@ -4578,7 +4660,7 @@ static int ocfs2_figure_insert_type(struct inode *inode,
                 le16_to_cpu(el->l_next_free_rec);
 
         if (!insert->ins_tree_depth) {
-                ocfs2_figure_contig_type(inode, insert, el, insert_rec, et);
+                ocfs2_figure_contig_type(et, insert, el, insert_rec);
                 ocfs2_figure_appending_type(insert, el, insert_rec);
                 return 0;
         }
@@ -4596,7 +4678,7 @@ static int ocfs2_figure_insert_type(struct inode *inode,
          * us the rightmost tree path. This is accounted for below in
          * the appending code.
          */
-        ret = ocfs2_find_path(inode, path, le32_to_cpu(insert_rec->e_cpos));
+        ret = ocfs2_find_path(et->et_ci, path, le32_to_cpu(insert_rec->e_cpos));
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -4612,7 +4694,7 @@ static int ocfs2_figure_insert_type(struct inode *inode,
          *     into two types of appends: simple record append, or a
          *     rotate inside the tail leaf.
          */
-        ocfs2_figure_contig_type(inode, insert, el, insert_rec, et);
+        ocfs2_figure_contig_type(et, insert, el, insert_rec);
 
         /*
          * The insert code isn't quite ready to deal with all cases of
@@ -4657,13 +4739,11 @@ out:
 }
 
 /*
- * Insert an extent into an inode btree.
+ * Insert an extent into a btree.
  *
- * The caller needs to update fe->i_clusters
+ * The caller needs to update the owning btree's cluster count.
  */
-int ocfs2_insert_extent(struct ocfs2_super *osb,
-                        handle_t *handle,
-                        struct inode *inode,
+int ocfs2_insert_extent(handle_t *handle,
                         struct ocfs2_extent_tree *et,
                         u32 cpos,
                         u64 start_blk,
@@ -4677,21 +4757,22 @@ int ocfs2_insert_extent(struct ocfs2_super *osb,
         struct ocfs2_insert_type insert = {0, };
         struct ocfs2_extent_rec rec;
 
-        mlog(0, "add %u clusters at position %u to inode %llu\n",
-             new_clusters, cpos, (unsigned long long)OCFS2_I(inode)->ip_blkno);
+        mlog(0, "add %u clusters at position %u to owner %llu\n",
+             new_clusters, cpos,
+             (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci));
 
         memset(&rec, 0, sizeof(rec));
         rec.e_cpos = cpu_to_le32(cpos);
         rec.e_blkno = cpu_to_le64(start_blk);
         rec.e_leaf_clusters = cpu_to_le16(new_clusters);
         rec.e_flags = flags;
-        status = ocfs2_et_insert_check(inode, et, &rec);
+        status = ocfs2_et_insert_check(et, &rec);
         if (status) {
                 mlog_errno(status);
                 goto bail;
         }
 
-        status = ocfs2_figure_insert_type(inode, et, &last_eb_bh, &rec,
+        status = ocfs2_figure_insert_type(et, &last_eb_bh, &rec,
                                           &free_records, &insert);
         if (status < 0) {
                 mlog_errno(status);
@@ -4705,7 +4786,7 @@ int ocfs2_insert_extent(struct ocfs2_super *osb,
              free_records, insert.ins_tree_depth);
 
         if (insert.ins_contig == CONTIG_NONE && free_records == 0) {
-                status = ocfs2_grow_tree(inode, handle, et,
+                status = ocfs2_grow_tree(handle, et,
                                          &insert.ins_tree_depth, &last_eb_bh,
                                          meta_ac);
                 if (status) {
@@ -4715,11 +4796,11 @@ int ocfs2_insert_extent(struct ocfs2_super *osb,
         }
 
         /* Finally, we can add clusters. This might rotate the tree for us. */
-        status = ocfs2_do_insert_extent(inode, handle, et, &rec, &insert);
+        status = ocfs2_do_insert_extent(handle, et, &rec, &insert);
         if (status < 0)
                 mlog_errno(status);
-        else if (et->et_ops == &ocfs2_dinode_et_ops)
-                ocfs2_extent_map_insert_rec(inode, &rec);
+        else
+                ocfs2_et_extent_map_insert(et, &rec);
 
 bail:
         brelse(last_eb_bh);
@@ -4735,13 +4816,11 @@ bail:
  * it is not limited to the file storage. Any extent tree can use this
  * function if it implements the proper ocfs2_extent_tree.
  */
-int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb,
-                                struct inode *inode,
+int ocfs2_add_clusters_in_btree(handle_t *handle,
+                                struct ocfs2_extent_tree *et,
                                 u32 *logical_offset,
                                 u32 clusters_to_add,
                                 int mark_unwritten,
-                                struct ocfs2_extent_tree *et,
-                                handle_t *handle,
                                 struct ocfs2_alloc_context *data_ac,
                                 struct ocfs2_alloc_context *meta_ac,
                                 enum ocfs2_alloc_restarted *reason_ret)
@@ -4752,13 +4831,15 @@ int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb,
         u32 bit_off, num_bits;
         u64 block;
         u8 flags = 0;
+        struct ocfs2_super *osb =
+                OCFS2_SB(ocfs2_metadata_cache_get_super(et->et_ci));
 
         BUG_ON(!clusters_to_add);
 
         if (mark_unwritten)
                 flags = OCFS2_EXT_UNWRITTEN;
 
-        free_extents = ocfs2_num_free_extents(osb, inode, et);
+        free_extents = ocfs2_num_free_extents(osb, et);
         if (free_extents < 0) {
                 status = free_extents;
                 mlog_errno(status);
@@ -4795,7 +4876,7 @@ int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb,
         BUG_ON(num_bits > clusters_to_add);
 
         /* reserve our write early -- insert_extent may update the tree root */
-        status = ocfs2_et_root_journal_access(handle, inode, et,
+        status = ocfs2_et_root_journal_access(handle, et,
                                               OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
@@ -4803,10 +4884,10 @@ int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb,
         }
 
         block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
-        mlog(0, "Allocating %u clusters at block %u for inode %llu\n",
-             num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
-        status = ocfs2_insert_extent(osb, handle, inode, et,
-                                     *logical_offset, block,
+        mlog(0, "Allocating %u clusters at block %u for owner %llu\n",
+             num_bits, bit_off,
+             (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci));
+        status = ocfs2_insert_extent(handle, et, *logical_offset, block,
                                      num_bits, flags, meta_ac);
         if (status < 0) {
                 mlog_errno(status);
@@ -4856,10 +4937,9 @@ static void ocfs2_make_right_split_rec(struct super_block *sb,
         split_rec->e_flags = rec->e_flags;
 }
 
-static int ocfs2_split_and_insert(struct inode *inode,
-                                  handle_t *handle,
-                                  struct ocfs2_path *path,
+static int ocfs2_split_and_insert(handle_t *handle,
                                   struct ocfs2_extent_tree *et,
+                                  struct ocfs2_path *path,
                                   struct buffer_head **last_eb_bh,
                                   int split_index,
                                   struct ocfs2_extent_rec *orig_split_rec,
@@ -4892,7 +4972,7 @@ leftright:
 
         if (le16_to_cpu(rightmost_el->l_next_free_rec) ==
             le16_to_cpu(rightmost_el->l_count)) {
-                ret = ocfs2_grow_tree(inode, handle, et,
+                ret = ocfs2_grow_tree(handle, et,
                                       &depth, last_eb_bh, meta_ac);
                 if (ret) {
                         mlog_errno(ret);
@@ -4921,8 +5001,8 @@ leftright:
                  */
                 insert.ins_split = SPLIT_RIGHT;
 
-                ocfs2_make_right_split_rec(inode->i_sb, &tmprec, insert_range,
-                                           &rec);
+                ocfs2_make_right_split_rec(ocfs2_metadata_cache_get_super(et->et_ci),
+                                           &tmprec, insert_range, &rec);
 
                 split_rec = tmprec;
 
@@ -4930,7 +5010,7 @@ leftright:
                 do_leftright = 1;
         }
 
-        ret = ocfs2_do_insert_extent(inode, handle, et, &split_rec, &insert);
+        ret = ocfs2_do_insert_extent(handle, et, &split_rec, &insert);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -4946,7 +5026,7 @@ leftright:
                 ocfs2_reinit_path(path, 1);
 
                 cpos = le32_to_cpu(split_rec.e_cpos);
-                ret = ocfs2_find_path(inode, path, cpos);
+                ret = ocfs2_find_path(et->et_ci, path, cpos);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -4961,8 +5041,8 @@ out:
         return ret;
 }
 
-static int ocfs2_replace_extent_rec(struct inode *inode,
-                                    handle_t *handle,
+static int ocfs2_replace_extent_rec(handle_t *handle,
+                                    struct ocfs2_extent_tree *et,
                                     struct ocfs2_path *path,
                                     struct ocfs2_extent_list *el,
                                     int split_index,
@@ -4970,7 +5050,7 @@ static int ocfs2_replace_extent_rec(struct inode *inode,
 {
         int ret;
 
-        ret = ocfs2_path_bh_journal_access(handle, inode, path,
+        ret = ocfs2_path_bh_journal_access(handle, et->et_ci, path,
                                            path_num_items(path) - 1);
         if (ret) {
                 mlog_errno(ret);
@@ -4985,9 +5065,8 @@ out:
 }
 
 /*
- * Mark part or all of the extent record at split_index in the leaf
- * pointed to by path as written. This removes the unwritten
- * extent flag.
+ * Split part or all of the extent record at split_index in the leaf
+ * pointed to by path. Merge with the contiguous extent record if needed.
  *
  * Care is taken to handle contiguousness so as to not grow the tree.
  *
@@ -5004,14 +5083,13 @@ out:
  * have been brought into cache (and pinned via the journal), so the
  * extra overhead is not expressed in terms of disk reads.
  */
-static int __ocfs2_mark_extent_written(struct inode *inode,
-                                       struct ocfs2_extent_tree *et,
-                                       handle_t *handle,
-                                       struct ocfs2_path *path,
-                                       int split_index,
-                                       struct ocfs2_extent_rec *split_rec,
-                                       struct ocfs2_alloc_context *meta_ac,
-                                       struct ocfs2_cached_dealloc_ctxt *dealloc)
+int ocfs2_split_extent(handle_t *handle,
+                       struct ocfs2_extent_tree *et,
+                       struct ocfs2_path *path,
+                       int split_index,
+                       struct ocfs2_extent_rec *split_rec,
+                       struct ocfs2_alloc_context *meta_ac,
+                       struct ocfs2_cached_dealloc_ctxt *dealloc)
 {
         int ret = 0;
         struct ocfs2_extent_list *el = path_leaf_el(path);
@@ -5020,12 +5098,6 @@ static int __ocfs2_mark_extent_written(struct inode *inode,
         struct ocfs2_merge_ctxt ctxt;
         struct ocfs2_extent_list *rightmost_el;
 
-        if (!(rec->e_flags & OCFS2_EXT_UNWRITTEN)) {
-                ret = -EIO;
-                mlog_errno(ret);
-                goto out;
-        }
-
         if (le32_to_cpu(rec->e_cpos) > le32_to_cpu(split_rec->e_cpos) ||
             ((le32_to_cpu(rec->e_cpos) + le16_to_cpu(rec->e_leaf_clusters)) <
              (le32_to_cpu(split_rec->e_cpos) + le16_to_cpu(split_rec->e_leaf_clusters)))) {
@@ -5034,19 +5106,19 @@ static int __ocfs2_mark_extent_written(struct inode *inode,
                 goto out;
         }
 
-        ctxt.c_contig_type = ocfs2_figure_merge_contig_type(inode, path, el,
+        ctxt.c_contig_type = ocfs2_figure_merge_contig_type(et, path, el,
                                                             split_index,
                                                             split_rec);
 
         /*
          * The core merge / split code wants to know how much room is
-         * left in this inodes allocation tree, so we pass the
+         * left in this allocation tree, so we pass the
          * rightmost extent list.
          */
         if (path->p_tree_depth) {
                 struct ocfs2_extent_block *eb;
 
-                ret = ocfs2_read_extent_block(inode,
+                ret = ocfs2_read_extent_block(et->et_ci,
                                               ocfs2_et_get_last_eb_blk(et),
                                               &last_eb_bh);
                 if (ret) {
@@ -5073,19 +5145,18 @@ static int __ocfs2_mark_extent_written(struct inode *inode,
 
         if (ctxt.c_contig_type == CONTIG_NONE) {
                 if (ctxt.c_split_covers_rec)
-                        ret = ocfs2_replace_extent_rec(inode, handle,
-                                                       path, el,
+                        ret = ocfs2_replace_extent_rec(handle, et, path, el,
                                                        split_index, split_rec);
                 else
-                        ret = ocfs2_split_and_insert(inode, handle, path, et,
+                        ret = ocfs2_split_and_insert(handle, et, path,
                                                      &last_eb_bh, split_index,
                                                      split_rec, meta_ac);
                 if (ret)
                         mlog_errno(ret);
         } else {
-                ret = ocfs2_try_to_merge_extent(inode, handle, path,
+                ret = ocfs2_try_to_merge_extent(handle, et, path,
                                                 split_index, split_rec,
-                                                dealloc, &ctxt, et);
+                                                dealloc, &ctxt);
                 if (ret)
                         mlog_errno(ret);
         }
@@ -5096,46 +5167,31 @@ out:
 }
 
 /*
- * Mark the already-existing extent at cpos as written for len clusters.
+ * Change the flags of the already-existing extent at cpos for len clusters.
+ *
+ * new_flags: the flags we want to set.
+ * clear_flags: the flags we want to clear.
+ * phys: the new physical offset we want this new extent starts from.
  *
  * If the existing extent is larger than the request, initiate a
  * split. An attempt will be made at merging with adjacent extents.
  *
  * The caller is responsible for passing down meta_ac if we'll need it.
  */
-int ocfs2_mark_extent_written(struct inode *inode,
-                              struct ocfs2_extent_tree *et,
-                              handle_t *handle, u32 cpos, u32 len, u32 phys,
-                              struct ocfs2_alloc_context *meta_ac,
-                              struct ocfs2_cached_dealloc_ctxt *dealloc)
+int ocfs2_change_extent_flag(handle_t *handle,
+                             struct ocfs2_extent_tree *et,
+                             u32 cpos, u32 len, u32 phys,
+                             struct ocfs2_alloc_context *meta_ac,
+                             struct ocfs2_cached_dealloc_ctxt *dealloc,
+                             int new_flags, int clear_flags)
 {
         int ret, index;
-        u64 start_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys);
+        struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci);
+        u64 start_blkno = ocfs2_clusters_to_blocks(sb, phys);
         struct ocfs2_extent_rec split_rec;
         struct ocfs2_path *left_path = NULL;
         struct ocfs2_extent_list *el;
-
-        mlog(0, "Inode %lu cpos %u, len %u, phys %u (%llu)\n",
-             inode->i_ino, cpos, len, phys, (unsigned long long)start_blkno);
-
-        if (!ocfs2_writes_unwritten_extents(OCFS2_SB(inode->i_sb))) {
-                ocfs2_error(inode->i_sb, "Inode %llu has unwritten extents "
-                            "that are being written to, but the feature bit "
-                            "is not set in the super block.",
-                            (unsigned long long)OCFS2_I(inode)->ip_blkno);
-                ret = -EROFS;
-                goto out;
-        }
-
-        /*
-         * XXX: This should be fixed up so that we just re-insert the
-         * next extent records.
-         *
-         * XXX: This is a hack on the extent tree, maybe it should be
-         * an op?
-         */
-        if (et->et_ops == &ocfs2_dinode_et_ops)
-                ocfs2_extent_map_trunc(inode, 0);
+        struct ocfs2_extent_rec *rec;
 
         left_path = ocfs2_new_path_from_et(et);
         if (!left_path) {
@@ -5144,7 +5200,7 @@ int ocfs2_mark_extent_written(struct inode *inode,
                 goto out;
         }
 
-        ret = ocfs2_find_path(inode, left_path, cpos);
+        ret = ocfs2_find_path(et->et_ci, left_path, cpos);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -5153,34 +5209,102 @@ int ocfs2_mark_extent_written(struct inode *inode,
 
         index = ocfs2_search_extent_list(el, cpos);
         if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) {
-                ocfs2_error(inode->i_sb,
-                            "Inode %llu has an extent at cpos %u which can no "
+                ocfs2_error(sb,
+                            "Owner %llu has an extent at cpos %u which can no "
                             "longer be found.\n",
-                            (unsigned long long)OCFS2_I(inode)->ip_blkno, cpos);
+                             (unsigned long long)
+                             ocfs2_metadata_cache_owner(et->et_ci), cpos);
                 ret = -EROFS;
                 goto out;
         }
 
+        ret = -EIO;
+        rec = &el->l_recs[index];
+        if (new_flags && (rec->e_flags & new_flags)) {
+                mlog(ML_ERROR, "Owner %llu tried to set %d flags on an "
+                     "extent that already had them",
+                     (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci),
+                     new_flags);
+                goto out;
+        }
+
+        if (clear_flags && !(rec->e_flags & clear_flags)) {
+                mlog(ML_ERROR, "Owner %llu tried to clear %d flags on an "
+                     "extent that didn't have them",
+                     (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci),
+                     clear_flags);
+                goto out;
+        }
+
         memset(&split_rec, 0, sizeof(struct ocfs2_extent_rec));
         split_rec.e_cpos = cpu_to_le32(cpos);
         split_rec.e_leaf_clusters = cpu_to_le16(len);
         split_rec.e_blkno = cpu_to_le64(start_blkno);
-        split_rec.e_flags = path_leaf_el(left_path)->l_recs[index].e_flags;
-        split_rec.e_flags &= ~OCFS2_EXT_UNWRITTEN;
-
-        ret = __ocfs2_mark_extent_written(inode, et, handle, left_path,
-                                          index, &split_rec, meta_ac,
-                                          dealloc);
+        split_rec.e_flags = rec->e_flags;
+        if (new_flags)
+                split_rec.e_flags |= new_flags;
+        if (clear_flags)
+                split_rec.e_flags &= ~clear_flags;
+
+        ret = ocfs2_split_extent(handle, et, left_path,
+                                 index, &split_rec, meta_ac,
+                                 dealloc);
         if (ret)
                 mlog_errno(ret);
 
 out:
         ocfs2_free_path(left_path);
         return ret;
+
 }
 
-static int ocfs2_split_tree(struct inode *inode, struct ocfs2_extent_tree *et,
-                            handle_t *handle, struct ocfs2_path *path,
+/*
+ * Mark the already-existing extent at cpos as written for len clusters.
+ * This removes the unwritten extent flag.
+ *
+ * If the existing extent is larger than the request, initiate a
+ * split. An attempt will be made at merging with adjacent extents.
+ *
+ * The caller is responsible for passing down meta_ac if we'll need it.
+ */
+int ocfs2_mark_extent_written(struct inode *inode,
+                              struct ocfs2_extent_tree *et,
+                              handle_t *handle, u32 cpos, u32 len, u32 phys,
+                              struct ocfs2_alloc_context *meta_ac,
+                              struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+        int ret;
+
+        mlog(0, "Inode %lu cpos %u, len %u, phys clusters %u\n",
+             inode->i_ino, cpos, len, phys);
+
+        if (!ocfs2_writes_unwritten_extents(OCFS2_SB(inode->i_sb))) {
+                ocfs2_error(inode->i_sb, "Inode %llu has unwritten extents "
+                            "that are being written to, but the feature bit "
+                            "is not set in the super block.",
+                            (unsigned long long)OCFS2_I(inode)->ip_blkno);
+                ret = -EROFS;
+                goto out;
+        }
+
+        /*
+         * XXX: This should be fixed up so that we just re-insert the
+         * next extent records.
+         */
+        ocfs2_et_extent_map_truncate(et, 0);
+
+        ret = ocfs2_change_extent_flag(handle, et, cpos,
+                                       len, phys, meta_ac, dealloc,
+                                       0, OCFS2_EXT_UNWRITTEN);
+        if (ret)
+                mlog_errno(ret);
+
+out:
+        return ret;
+}
+
+static int ocfs2_split_tree(handle_t *handle, struct ocfs2_extent_tree *et,
+                            struct ocfs2_path *path,
                             int index, u32 new_range,
                             struct ocfs2_alloc_context *meta_ac)
 {
@@ -5197,11 +5321,12 @@ static int ocfs2_split_tree(struct inode *inode, struct ocfs2_extent_tree *et,
          */
         el = path_leaf_el(path);
         rec = &el->l_recs[index];
-        ocfs2_make_right_split_rec(inode->i_sb, &split_rec, new_range, rec);
+        ocfs2_make_right_split_rec(ocfs2_metadata_cache_get_super(et->et_ci),
+                                   &split_rec, new_range, rec);
 
         depth = path->p_tree_depth;
         if (depth > 0) {
-                ret = ocfs2_read_extent_block(inode,
+                ret = ocfs2_read_extent_block(et->et_ci,
                                               ocfs2_et_get_last_eb_blk(et),
                                               &last_eb_bh);
                 if (ret < 0) {
@@ -5224,7 +5349,7 @@ static int ocfs2_split_tree(struct inode *inode, struct ocfs2_extent_tree *et,
 
         if (le16_to_cpu(rightmost_el->l_next_free_rec) ==
             le16_to_cpu(rightmost_el->l_count)) {
-                ret = ocfs2_grow_tree(inode, handle, et, &depth, &last_eb_bh,
+                ret = ocfs2_grow_tree(handle, et, &depth, &last_eb_bh,
                                       meta_ac);
                 if (ret) {
                         mlog_errno(ret);
@@ -5238,7 +5363,7 @@ static int ocfs2_split_tree(struct inode *inode, struct ocfs2_extent_tree *et,
         insert.ins_split = SPLIT_RIGHT;
         insert.ins_tree_depth = depth;
 
-        ret = ocfs2_do_insert_extent(inode, handle, et, &split_rec, &insert);
+        ret = ocfs2_do_insert_extent(handle, et, &split_rec, &insert);
         if (ret)
                 mlog_errno(ret);
 
@@ -5247,23 +5372,23 @@ out:
         return ret;
 }
 
-static int ocfs2_truncate_rec(struct inode *inode, handle_t *handle,
+static int ocfs2_truncate_rec(handle_t *handle,
+                              struct ocfs2_extent_tree *et,
                               struct ocfs2_path *path, int index,
                               struct ocfs2_cached_dealloc_ctxt *dealloc,
-                              u32 cpos, u32 len,
-                              struct ocfs2_extent_tree *et)
+                              u32 cpos, u32 len)
 {
         int ret;
         u32 left_cpos, rec_range, trunc_range;
         int wants_rotate = 0, is_rightmost_tree_rec = 0;
-        struct super_block *sb = inode->i_sb;
+        struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci);
         struct ocfs2_path *left_path = NULL;
         struct ocfs2_extent_list *el = path_leaf_el(path);
         struct ocfs2_extent_rec *rec;
         struct ocfs2_extent_block *eb;
 
         if (ocfs2_is_empty_extent(&el->l_recs[0]) && index > 0) {
-                ret = ocfs2_rotate_tree_left(inode, handle, path, dealloc, et);
+                ret = ocfs2_rotate_tree_left(handle, et, path, dealloc);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -5295,14 +5420,13 @@ static int ocfs2_truncate_rec(struct inode *inode, handle_t *handle,
                  * by this leaf and the one to it's left.
                  *
                  * There are two cases we can skip:
-                 *   1) Path is the leftmost one in our inode tree.
+                 *   1) Path is the leftmost one in our btree.
                  *   2) The leaf is rightmost and will be empty after
                  *      we remove the extent record - the rotate code
                  *      knows how to update the newly formed edge.
                  */
 
-                ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb, path,
-                                                    &left_cpos);
+                ret = ocfs2_find_cpos_for_left_leaf(sb, path, &left_cpos);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -5316,7 +5440,8 @@ static int ocfs2_truncate_rec(struct inode *inode, handle_t *handle,
                                 goto out;
                         }
 
-                        ret = ocfs2_find_path(inode, left_path, left_cpos);
+                        ret = ocfs2_find_path(et->et_ci, left_path,
+                                              left_cpos);
                         if (ret) {
                                 mlog_errno(ret);
                                 goto out;
@@ -5332,13 +5457,13 @@ static int ocfs2_truncate_rec(struct inode *inode, handle_t *handle,
                 goto out;
         }
 
-        ret = ocfs2_journal_access_path(inode, handle, path);
+        ret = ocfs2_journal_access_path(et->et_ci, handle, path);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
         }
 
-        ret = ocfs2_journal_access_path(inode, handle, left_path);
+        ret = ocfs2_journal_access_path(et->et_ci, handle, left_path);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -5361,7 +5486,7 @@ static int ocfs2_truncate_rec(struct inode *inode, handle_t *handle,
                          * be deleted by the rotate code.
                          */
                         rec = &el->l_recs[next_free - 1];
-                        ocfs2_adjust_rightmost_records(inode, handle, path,
+                        ocfs2_adjust_rightmost_records(handle, et, path,
                                                        rec);
                 }
         } else if (le32_to_cpu(rec->e_cpos) == cpos) {
@@ -5373,11 +5498,12 @@ static int ocfs2_truncate_rec(struct inode *inode, handle_t *handle,
                 /* Remove rightmost portion of the record */
                 le16_add_cpu(&rec->e_leaf_clusters, -len);
                 if (is_rightmost_tree_rec)
-                        ocfs2_adjust_rightmost_records(inode, handle, path, rec);
+                        ocfs2_adjust_rightmost_records(handle, et, path, rec);
         } else {
                 /* Caller should have trapped this. */
-                mlog(ML_ERROR, "Inode %llu: Invalid record truncate: (%u, %u) "
-                     "(%u, %u)\n", (unsigned long long)OCFS2_I(inode)->ip_blkno,
+                mlog(ML_ERROR, "Owner %llu: Invalid record truncate: (%u, %u) "
+                     "(%u, %u)\n",
+                     (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci),
                      le32_to_cpu(rec->e_cpos),
                      le16_to_cpu(rec->e_leaf_clusters), cpos, len);
                 BUG();
@@ -5386,14 +5512,14 @@ static int ocfs2_truncate_rec(struct inode *inode, handle_t *handle,
         if (left_path) {
                 int subtree_index;
 
-                subtree_index = ocfs2_find_subtree_root(inode, left_path, path);
-                ocfs2_complete_edge_insert(inode, handle, left_path, path,
+                subtree_index = ocfs2_find_subtree_root(et, left_path, path);
+                ocfs2_complete_edge_insert(handle, left_path, path,
                                            subtree_index);
         }
 
         ocfs2_journal_dirty(handle, path_leaf_bh(path));
 
-        ret = ocfs2_rotate_tree_left(inode, handle, path, dealloc, et);
+        ret = ocfs2_rotate_tree_left(handle, et, path, dealloc);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -5404,9 +5530,9 @@ out:
         return ret;
 }
 
-int ocfs2_remove_extent(struct inode *inode,
+int ocfs2_remove_extent(handle_t *handle,
                         struct ocfs2_extent_tree *et,
-                        u32 cpos, u32 len, handle_t *handle,
+                        u32 cpos, u32 len,
                         struct ocfs2_alloc_context *meta_ac,
                         struct ocfs2_cached_dealloc_ctxt *dealloc)
 {
@@ -5416,7 +5542,11 @@ int ocfs2_remove_extent(struct inode *inode,
         struct ocfs2_extent_list *el;
         struct ocfs2_path *path = NULL;
 
-        ocfs2_extent_map_trunc(inode, 0);
+        /*
+         * XXX: Why are we truncating to 0 instead of wherever this
+         * affects us?
+         */
+        ocfs2_et_extent_map_truncate(et, 0);
 
         path = ocfs2_new_path_from_et(et);
         if (!path) {
@@ -5425,7 +5555,7 @@ int ocfs2_remove_extent(struct inode *inode,
                 goto out;
         }
 
-        ret = ocfs2_find_path(inode, path, cpos);
+        ret = ocfs2_find_path(et->et_ci, path, cpos);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -5434,10 +5564,11 @@ int ocfs2_remove_extent(struct inode *inode,
         el = path_leaf_el(path);
         index = ocfs2_search_extent_list(el, cpos);
         if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) {
-                ocfs2_error(inode->i_sb,
-                            "Inode %llu has an extent at cpos %u which can no "
+                ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci),
+                            "Owner %llu has an extent at cpos %u which can no "
                             "longer be found.\n",
-                            (unsigned long long)OCFS2_I(inode)->ip_blkno, cpos);
+                            (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci),
+                            cpos);
                 ret = -EROFS;
                 goto out;
         }
@@ -5464,20 +5595,21 @@ int ocfs2_remove_extent(struct inode *inode,
 
         BUG_ON(cpos < le32_to_cpu(rec->e_cpos) || trunc_range > rec_range);
 
-        mlog(0, "Inode %llu, remove (cpos %u, len %u). Existing index %d "
+        mlog(0, "Owner %llu, remove (cpos %u, len %u). Existing index %d "
              "(cpos %u, len %u)\n",
-             (unsigned long long)OCFS2_I(inode)->ip_blkno, cpos, len, index,
+             (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci),
+             cpos, len, index,
              le32_to_cpu(rec->e_cpos), ocfs2_rec_clusters(el, rec));
 
         if (le32_to_cpu(rec->e_cpos) == cpos || rec_range == trunc_range) {
-                ret = ocfs2_truncate_rec(inode, handle, path, index, dealloc,
-                                         cpos, len, et);
+                ret = ocfs2_truncate_rec(handle, et, path, index, dealloc,
+                                         cpos, len);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
                 }
         } else {
-                ret = ocfs2_split_tree(inode, et, handle, path, index,
+                ret = ocfs2_split_tree(handle, et, path, index,
                                        trunc_range, meta_ac);
                 if (ret) {
                         mlog_errno(ret);
@@ -5490,7 +5622,7 @@ int ocfs2_remove_extent(struct inode *inode,
                  */
                 ocfs2_reinit_path(path, 1);
 
-                ret = ocfs2_find_path(inode, path, cpos);
+                ret = ocfs2_find_path(et->et_ci, path, cpos);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -5499,9 +5631,9 @@ int ocfs2_remove_extent(struct inode *inode,
                 el = path_leaf_el(path);
                 index = ocfs2_search_extent_list(el, cpos);
                 if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) {
-                        ocfs2_error(inode->i_sb,
-                                    "Inode %llu: split at cpos %u lost record.",
-                                    (unsigned long long)OCFS2_I(inode)->ip_blkno,
+                        ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci),
+                                    "Owner %llu: split at cpos %u lost record.",
+                                    (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci),
                                     cpos);
                         ret = -EROFS;
                         goto out;
@@ -5515,18 +5647,18 @@ int ocfs2_remove_extent(struct inode *inode,
                 rec_range = le32_to_cpu(rec->e_cpos) +
                         ocfs2_rec_clusters(el, rec);
                 if (rec_range != trunc_range) {
-                        ocfs2_error(inode->i_sb,
-                                    "Inode %llu: error after split at cpos %u"
+                        ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci),
+                                    "Owner %llu: error after split at cpos %u"
                                     "trunc len %u, existing record is (%u,%u)",
-                                    (unsigned long long)OCFS2_I(inode)->ip_blkno,
+                                    (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci),
                                     cpos, len, le32_to_cpu(rec->e_cpos),
                                     ocfs2_rec_clusters(el, rec));
                         ret = -EROFS;
                         goto out;
                 }
 
-                ret = ocfs2_truncate_rec(inode, handle, path, index, dealloc,
-                                         cpos, len, et);
+                ret = ocfs2_truncate_rec(handle, et, path, index, dealloc,
+                                         cpos, len);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -5573,7 +5705,7 @@ int ocfs2_remove_btree_range(struct inode *inode,
                 goto out;
         }
 
-        ret = ocfs2_et_root_journal_access(handle, inode, et,
+        ret = ocfs2_et_root_journal_access(handle, et,
                                            OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
@@ -5583,14 +5715,13 @@ int ocfs2_remove_btree_range(struct inode *inode,
         vfs_dq_free_space_nodirty(inode,
                                   ocfs2_clusters_to_bytes(inode->i_sb, len));
 
-        ret = ocfs2_remove_extent(inode, et, cpos, len, handle, meta_ac,
-                                  dealloc);
+        ret = ocfs2_remove_extent(handle, et, cpos, len, meta_ac, dealloc);
         if (ret) {
                 mlog_errno(ret);
                 goto out_commit;
         }
 
-        ocfs2_et_update_clusters(inode, et, -len);
+        ocfs2_et_update_clusters(et, -len);
 
         ret = ocfs2_journal_dirty(handle, et->et_root_bh);
         if (ret) {
@@ -5690,7 +5821,7 @@ int ocfs2_truncate_log_append(struct ocfs2_super *osb,
                 goto bail;
         }
 
-        status = ocfs2_journal_access_di(handle, tl_inode, tl_bh,
+        status = ocfs2_journal_access_di(handle, INODE_CACHE(tl_inode), tl_bh,
                                          OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
@@ -5752,7 +5883,7 @@ static int ocfs2_replay_truncate_records(struct ocfs2_super *osb,
         while (i >= 0) {
                 /* Caller has given us at least enough credits to
                  * update the truncate log dinode */
-                status = ocfs2_journal_access_di(handle, tl_inode, tl_bh,
+                status = ocfs2_journal_access_di(handle, INODE_CACHE(tl_inode), tl_bh,
                                                  OCFS2_JOURNAL_ACCESS_WRITE);
                 if (status < 0) {
                         mlog_errno(status);
@@ -6010,7 +6141,7 @@ int ocfs2_begin_truncate_log_recovery(struct ocfs2_super *osb,
                 tl->tl_used = 0;
 
                 ocfs2_compute_meta_ecc(osb->sb, tl_bh->b_data, &di->i_check);
-                status = ocfs2_write_block(osb, tl_bh, tl_inode);
+                status = ocfs2_write_block(osb, tl_bh, INODE_CACHE(tl_inode));
                 if (status < 0) {
                         mlog_errno(status);
                         goto bail;
@@ -6400,9 +6531,9 @@ ocfs2_find_per_slot_free_list(int type,
         return fl;
 }
 
-static int ocfs2_cache_block_dealloc(struct ocfs2_cached_dealloc_ctxt *ctxt,
-                                     int type, int slot, u64 blkno,
-                                     unsigned int bit)
+int ocfs2_cache_block_dealloc(struct ocfs2_cached_dealloc_ctxt *ctxt,
+                              int type, int slot, u64 blkno,
+                              unsigned int bit)
 {
         int ret;
         struct ocfs2_per_slot_free_list *fl;
@@ -6518,7 +6649,7 @@ static int ocfs2_find_new_last_ext_blk(struct inode *inode,
                 goto out;
         }
 
-        ret = ocfs2_find_leaf(inode, path_root_el(path), cpos, &bh);
+        ret = ocfs2_find_leaf(INODE_CACHE(inode), path_root_el(path), cpos, &bh);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -6551,7 +6682,7 @@ out:
  */
 static int ocfs2_trim_tree(struct inode *inode, struct ocfs2_path *path,
                            handle_t *handle, struct ocfs2_truncate_context *tc,
-                           u32 clusters_to_del, u64 *delete_start)
+                           u32 clusters_to_del, u64 *delete_start, u8 *flags)
 {
         int ret, i, index = path->p_tree_depth;
         u32 new_edge = 0;
@@ -6561,6 +6692,7 @@ static int ocfs2_trim_tree(struct inode *inode, struct ocfs2_path *path,
         struct ocfs2_extent_rec *rec;
 
         *delete_start = 0;
+        *flags = 0;
 
         while (index >= 0) {
                 bh = path->p_node[index].bh;
@@ -6648,6 +6780,7 @@ find_tail_record:
                         *delete_start = le64_to_cpu(rec->e_blkno)
                                 + ocfs2_clusters_to_blocks(inode->i_sb,
                                         le16_to_cpu(rec->e_leaf_clusters));
+                        *flags = rec->e_flags;
 
                         /*
                          * If it's now empty, remove this record.
@@ -6719,7 +6852,7 @@ delete:
 
                         mlog(0, "deleting this extent block.\n");
 
-                        ocfs2_remove_from_cache(inode, bh);
+                        ocfs2_remove_from_cache(INODE_CACHE(inode), bh);
 
                         BUG_ON(ocfs2_rec_clusters(el, &el->l_recs[0]));
                         BUG_ON(le32_to_cpu(el->l_recs[0].e_cpos));
@@ -6747,7 +6880,8 @@ static int ocfs2_do_truncate(struct ocfs2_super *osb,
                              struct buffer_head *fe_bh,
                              handle_t *handle,
                              struct ocfs2_truncate_context *tc,
-                             struct ocfs2_path *path)
+                             struct ocfs2_path *path,
+                             struct ocfs2_alloc_context *meta_ac)
 {
         int status;
         struct ocfs2_dinode *fe;
@@ -6755,6 +6889,7 @@ static int ocfs2_do_truncate(struct ocfs2_super *osb,
         struct ocfs2_extent_list *el;
         struct buffer_head *last_eb_bh = NULL;
         u64 delete_blk = 0;
+        u8 rec_flags;
 
         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 
@@ -6769,14 +6904,14 @@ static int ocfs2_do_truncate(struct ocfs2_super *osb,
          * Each component will be touched, so we might as well journal
          * here to avoid having to handle errors later.
          */
-        status = ocfs2_journal_access_path(inode, handle, path);
+        status = ocfs2_journal_access_path(INODE_CACHE(inode), handle, path);
         if (status < 0) {
                 mlog_errno(status);
                 goto bail;
         }
 
         if (last_eb_bh) {
-                status = ocfs2_journal_access_eb(handle, inode, last_eb_bh,
+                status = ocfs2_journal_access_eb(handle, INODE_CACHE(inode), last_eb_bh,
                                                  OCFS2_JOURNAL_ACCESS_WRITE);
                 if (status < 0) {
                         mlog_errno(status);
@@ -6810,7 +6945,7 @@ static int ocfs2_do_truncate(struct ocfs2_super *osb,
         inode->i_blocks = ocfs2_inode_sector_count(inode);
 
         status = ocfs2_trim_tree(inode, path, handle, tc,
-                                 clusters_to_del, &delete_blk);
+                                 clusters_to_del, &delete_blk, &rec_flags);
         if (status) {
                 mlog_errno(status);
                 goto bail;
@@ -6842,8 +6977,16 @@ static int ocfs2_do_truncate(struct ocfs2_super *osb,
         }
 
         if (delete_blk) {
-                status = ocfs2_truncate_log_append(osb, handle, delete_blk,
-                                                   clusters_to_del);
+                if (rec_flags & OCFS2_EXT_REFCOUNTED)
+                        status = ocfs2_decrease_refcount(inode, handle,
+                                        ocfs2_blocks_to_clusters(osb->sb,
+                                                                 delete_blk),
+                                        clusters_to_del, meta_ac,
+                                        &tc->tc_dealloc, 1);
+                else
+                        status = ocfs2_truncate_log_append(osb, handle,
+                                                           delete_blk,
+                                                           clusters_to_del);
                 if (status < 0) {
                         mlog_errno(status);
                         goto bail;
@@ -6863,9 +7006,9 @@ static int ocfs2_zero_func(handle_t *handle, struct buffer_head *bh)
         return 0;
 }
 
-static void ocfs2_map_and_dirty_page(struct inode *inode, handle_t *handle,
-                                     unsigned int from, unsigned int to,
-                                     struct page *page, int zero, u64 *phys)
+void ocfs2_map_and_dirty_page(struct inode *inode, handle_t *handle,
+                              unsigned int from, unsigned int to,
+                              struct page *page, int zero, u64 *phys)
 {
         int ret, partial = 0;
 
@@ -6933,20 +7076,16 @@ out:
                 ocfs2_unlock_and_free_pages(pages, numpages);
 }
 
-static int ocfs2_grab_eof_pages(struct inode *inode, loff_t start, loff_t end,
-                                struct page **pages, int *num)
+int ocfs2_grab_pages(struct inode *inode, loff_t start, loff_t end,
+                     struct page **pages, int *num)
 {
         int numpages, ret = 0;
-        struct super_block *sb = inode->i_sb;
         struct address_space *mapping = inode->i_mapping;
         unsigned long index;
         loff_t last_page_bytes;
 
         BUG_ON(start > end);
 
-        BUG_ON(start >> OCFS2_SB(sb)->s_clustersize_bits !=
-               (end - 1) >> OCFS2_SB(sb)->s_clustersize_bits);
-
         numpages = 0;
         last_page_bytes = PAGE_ALIGN(end);
         index = start >> PAGE_CACHE_SHIFT;
@@ -6974,6 +7113,17 @@ out:
         return ret;
 }
 
+static int ocfs2_grab_eof_pages(struct inode *inode, loff_t start, loff_t end,
+                                struct page **pages, int *num)
+{
+        struct super_block *sb = inode->i_sb;
+
+        BUG_ON(start >> OCFS2_SB(sb)->s_clustersize_bits !=
+               (end - 1) >> OCFS2_SB(sb)->s_clustersize_bits);
+
+        return ocfs2_grab_pages(inode, start, end, pages, num);
+}
+
 /*
  * Zero the area past i_size but still within an allocated
  * cluster. This avoids exposing nonzero data on subsequent file
@@ -7138,7 +7288,7 @@ int ocfs2_convert_inline_data_to_extents(struct inode *inode,
                 goto out_unlock;
         }
 
-        ret = ocfs2_journal_access_di(handle, inode, di_bh,
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
@@ -7218,9 +7368,8 @@ int ocfs2_convert_inline_data_to_extents(struct inode *inode,
                  * this proves to be false, we could always re-build
                  * the in-inode data from our pages.
                  */
-                ocfs2_init_dinode_extent_tree(&et, inode, di_bh);
-                ret = ocfs2_insert_extent(osb, handle, inode, &et,
-                                          0, block, 1, 0, NULL);
+                ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
+                ret = ocfs2_insert_extent(handle, &et, 0, block, 1, 0, NULL);
                 if (ret) {
                         mlog_errno(ret);
                         goto out_commit;
@@ -7262,11 +7411,14 @@ int ocfs2_commit_truncate(struct ocfs2_super *osb,
 {
         int status, i, credits, tl_sem = 0;
         u32 clusters_to_del, new_highest_cpos, range;
+        u64 blkno = 0;
         struct ocfs2_extent_list *el;
         handle_t *handle = NULL;
         struct inode *tl_inode = osb->osb_tl_inode;
         struct ocfs2_path *path = NULL;
         struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
+        struct ocfs2_alloc_context *meta_ac = NULL;
+        struct ocfs2_refcount_tree *ref_tree = NULL;
 
         mlog_entry_void();
 
@@ -7292,10 +7444,12 @@ start:
                 goto bail;
         }
 
+        credits = 0;
+
         /*
          * Truncate always works against the rightmost tree branch.
          */
-        status = ocfs2_find_path(inode, path, UINT_MAX);
+        status = ocfs2_find_path(INODE_CACHE(inode), path, UINT_MAX);
         if (status) {
                 mlog_errno(status);
                 goto bail;
@@ -7332,10 +7486,15 @@ start:
                 clusters_to_del = 0;
         } else if (le32_to_cpu(el->l_recs[i].e_cpos) >= new_highest_cpos) {
                 clusters_to_del = ocfs2_rec_clusters(el, &el->l_recs[i]);
+                blkno = le64_to_cpu(el->l_recs[i].e_blkno);
         } else if (range > new_highest_cpos) {
                 clusters_to_del = (ocfs2_rec_clusters(el, &el->l_recs[i]) +
                                    le32_to_cpu(el->l_recs[i].e_cpos)) -
                                   new_highest_cpos;
+                blkno = le64_to_cpu(el->l_recs[i].e_blkno) +
+                        ocfs2_clusters_to_blocks(inode->i_sb,
+                                ocfs2_rec_clusters(el, &el->l_recs[i]) -
+                                clusters_to_del);
         } else {
                 status = 0;
                 goto bail;
@@ -7344,6 +7503,29 @@ start:
         mlog(0, "clusters_to_del = %u in this pass, tail blk=%llu\n",
              clusters_to_del, (unsigned long long)path_leaf_bh(path)->b_blocknr);
 
+        if (el->l_recs[i].e_flags & OCFS2_EXT_REFCOUNTED && clusters_to_del) {
+                BUG_ON(!(OCFS2_I(inode)->ip_dyn_features &
+                         OCFS2_HAS_REFCOUNT_FL));
+
+                status = ocfs2_lock_refcount_tree(osb,
+                                                le64_to_cpu(di->i_refcount_loc),
+                                                1, &ref_tree, NULL);
+                if (status) {
+                        mlog_errno(status);
+                        goto bail;
+                }
+
+                status = ocfs2_prepare_refcount_change_for_del(inode, fe_bh,
+                                                               blkno,
+                                                               clusters_to_del,
+                                                               &credits,
+                                                               &meta_ac);
+                if (status < 0) {
+                        mlog_errno(status);
+                        goto bail;
+                }
+        }
+
         mutex_lock(&tl_inode->i_mutex);
         tl_sem = 1;
         /* ocfs2_truncate_log_needs_flush guarantees us at least one
@@ -7357,7 +7539,7 @@ start:
                 }
         }
 
-        credits = ocfs2_calc_tree_trunc_credits(osb->sb, clusters_to_del,
+        credits += ocfs2_calc_tree_trunc_credits(osb->sb, clusters_to_del,
                                                 (struct ocfs2_dinode *)fe_bh->b_data,
                                                 el);
         handle = ocfs2_start_trans(osb, credits);
@@ -7369,7 +7551,7 @@ start:
         }
 
         status = ocfs2_do_truncate(osb, clusters_to_del, inode, fe_bh, handle,
-                                   tc, path);
+                                   tc, path, meta_ac);
         if (status < 0) {
                 mlog_errno(status);
                 goto bail;
@@ -7383,6 +7565,16 @@ start:
 
         ocfs2_reinit_path(path, 1);
 
+        if (meta_ac) {
+                ocfs2_free_alloc_context(meta_ac);
+                meta_ac = NULL;
+        }
+
+        if (ref_tree) {
+                ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
+                ref_tree = NULL;
+        }
+
         /*
          * The check above will catch the case where we've truncated
          * away all allocation.
@@ -7399,6 +7591,12 @@ bail:
         if (handle)
                 ocfs2_commit_trans(osb, handle);
 
+        if (meta_ac)
+                ocfs2_free_alloc_context(meta_ac);
+
+        if (ref_tree)
+                ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
+
         ocfs2_run_deallocs(osb, &tc->tc_dealloc);
 
         ocfs2_free_path(path);
@@ -7445,7 +7643,7 @@ int ocfs2_prepare_truncate(struct ocfs2_super *osb,
         ocfs2_init_dealloc_ctxt(&(*tc)->tc_dealloc);
 
         if (fe->id2.i_list.l_tree_depth) {
-                status = ocfs2_read_extent_block(inode,
+                status = ocfs2_read_extent_block(INODE_CACHE(inode),
                                                  le64_to_cpu(fe->i_last_eb_blk),
                                                  &last_eb_bh);
                 if (status < 0) {
@@ -7507,7 +7705,7 @@ int ocfs2_truncate_inline(struct inode *inode, struct buffer_head *di_bh,
                 goto out;
         }
 
-        ret = ocfs2_journal_access_di(handle, inode, di_bh,
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h
index 353254ba29e1..9c122d574464 100644
--- a/fs/ocfs2/alloc.h
+++ b/fs/ocfs2/alloc.h
@@ -45,7 +45,8 @@
  *
  * ocfs2_extent_tree contains info for the root of the b-tree, it must have a
  * root ocfs2_extent_list and a root_bh so that they can be used in the b-tree
- * functions.  With metadata ecc, we now call different journal_access
+ * functions.  It needs the ocfs2_caching_info structure associated with
+ * I/O on the tree.  With metadata ecc, we now call different journal_access
  * functions for each type of metadata, so it must have the
  * root_journal_access function.
  * ocfs2_extent_tree_operations abstract the normal operations we do for
@@ -56,6 +57,7 @@ struct ocfs2_extent_tree {
         struct ocfs2_extent_tree_operations     *et_ops;
         struct buffer_head                      *et_root_bh;
         struct ocfs2_extent_list                *et_root_el;
+        struct ocfs2_caching_info               *et_ci;
         ocfs2_journal_access_func               et_root_journal_access;
         void                                    *et_object;
         unsigned int                            et_max_leaf_clusters;
@@ -66,31 +68,32 @@ struct ocfs2_extent_tree {
  * specified object buffer.
  */
 void ocfs2_init_dinode_extent_tree(struct ocfs2_extent_tree *et,
-                                   struct inode *inode,
+                                   struct ocfs2_caching_info *ci,
                                    struct buffer_head *bh);
 void ocfs2_init_xattr_tree_extent_tree(struct ocfs2_extent_tree *et,
-                                       struct inode *inode,
+                                       struct ocfs2_caching_info *ci,
                                        struct buffer_head *bh);
 struct ocfs2_xattr_value_buf;
 void ocfs2_init_xattr_value_extent_tree(struct ocfs2_extent_tree *et,
-                                        struct inode *inode,
+                                        struct ocfs2_caching_info *ci,
                                         struct ocfs2_xattr_value_buf *vb);
 void ocfs2_init_dx_root_extent_tree(struct ocfs2_extent_tree *et,
-                                    struct inode *inode,
+                                    struct ocfs2_caching_info *ci,
                                     struct buffer_head *bh);
+void ocfs2_init_refcount_extent_tree(struct ocfs2_extent_tree *et,
+                                     struct ocfs2_caching_info *ci,
+                                     struct buffer_head *bh);
 
 /*
  * Read an extent block into *bh.  If *bh is NULL, a bh will be
  * allocated.  This is a cached read.  The extent block will be validated
  * with ocfs2_validate_extent_block().
  */
-int ocfs2_read_extent_block(struct inode *inode, u64 eb_blkno,
+int ocfs2_read_extent_block(struct ocfs2_caching_info *ci, u64 eb_blkno,
                             struct buffer_head **bh);
 
 struct ocfs2_alloc_context;
-int ocfs2_insert_extent(struct ocfs2_super *osb,
-                        handle_t *handle,
-                        struct inode *inode,
+int ocfs2_insert_extent(handle_t *handle,
                         struct ocfs2_extent_tree *et,
                         u32 cpos,
                         u64 start_blk,
@@ -103,25 +106,36 @@ enum ocfs2_alloc_restarted {
         RESTART_TRANS,
         RESTART_META
 };
-int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb,
-                                struct inode *inode,
+int ocfs2_add_clusters_in_btree(handle_t *handle,
+                                struct ocfs2_extent_tree *et,
                                 u32 *logical_offset,
                                 u32 clusters_to_add,
                                 int mark_unwritten,
-                                struct ocfs2_extent_tree *et,
-                                handle_t *handle,
                                 struct ocfs2_alloc_context *data_ac,
                                 struct ocfs2_alloc_context *meta_ac,
                                 enum ocfs2_alloc_restarted *reason_ret);
 struct ocfs2_cached_dealloc_ctxt;
+struct ocfs2_path;
+int ocfs2_split_extent(handle_t *handle,
+                       struct ocfs2_extent_tree *et,
+                       struct ocfs2_path *path,
+                       int split_index,
+                       struct ocfs2_extent_rec *split_rec,
+                       struct ocfs2_alloc_context *meta_ac,
+                       struct ocfs2_cached_dealloc_ctxt *dealloc);
 int ocfs2_mark_extent_written(struct inode *inode,
                               struct ocfs2_extent_tree *et,
                               handle_t *handle, u32 cpos, u32 len, u32 phys,
                               struct ocfs2_alloc_context *meta_ac,
                               struct ocfs2_cached_dealloc_ctxt *dealloc);
-int ocfs2_remove_extent(struct inode *inode,
-                        struct ocfs2_extent_tree *et,
-                        u32 cpos, u32 len, handle_t *handle,
+int ocfs2_change_extent_flag(handle_t *handle,
+                             struct ocfs2_extent_tree *et,
+                             u32 cpos, u32 len, u32 phys,
+                             struct ocfs2_alloc_context *meta_ac,
+                             struct ocfs2_cached_dealloc_ctxt *dealloc,
+                             int new_flags, int clear_flags);
+int ocfs2_remove_extent(handle_t *handle, struct ocfs2_extent_tree *et,
+                        u32 cpos, u32 len,
                         struct ocfs2_alloc_context *meta_ac,
                         struct ocfs2_cached_dealloc_ctxt *dealloc);
 int ocfs2_remove_btree_range(struct inode *inode,
@@ -130,7 +144,6 @@ int ocfs2_remove_btree_range(struct inode *inode,
                              struct ocfs2_cached_dealloc_ctxt *dealloc);
 
 int ocfs2_num_free_extents(struct ocfs2_super *osb,
-                           struct inode *inode,
                            struct ocfs2_extent_tree *et);
 
 /*
@@ -195,6 +208,9 @@ static inline void ocfs2_init_dealloc_ctxt(struct ocfs2_cached_dealloc_ctxt *c)
 }
 int ocfs2_cache_cluster_dealloc(struct ocfs2_cached_dealloc_ctxt *ctxt,
                                 u64 blkno, unsigned int bit);
+int ocfs2_cache_block_dealloc(struct ocfs2_cached_dealloc_ctxt *ctxt,
+                              int type, int slot, u64 blkno,
+                              unsigned int bit);
 static inline int ocfs2_dealloc_has_cluster(struct ocfs2_cached_dealloc_ctxt *c)
 {
         return c->c_global_allocator != NULL;
@@ -222,8 +238,9 @@ int ocfs2_commit_truncate(struct ocfs2_super *osb,
 int ocfs2_truncate_inline(struct inode *inode, struct buffer_head *di_bh,
                           unsigned int start, unsigned int end, int trunc);
 
-int ocfs2_find_leaf(struct inode *inode, struct ocfs2_extent_list *root_el,
-                    u32 cpos, struct buffer_head **leaf_bh);
+int ocfs2_find_leaf(struct ocfs2_caching_info *ci,
+                    struct ocfs2_extent_list *root_el, u32 cpos,
+                    struct buffer_head **leaf_bh);
 int ocfs2_search_extent_list(struct ocfs2_extent_list *el, u32 v_cluster);
 
 /*
@@ -254,4 +271,50 @@ static inline int ocfs2_is_empty_extent(struct ocfs2_extent_rec *rec)
         return !rec->e_leaf_clusters;
 }
 
+int ocfs2_grab_pages(struct inode *inode, loff_t start, loff_t end,
+                     struct page **pages, int *num);
+void ocfs2_map_and_dirty_page(struct inode *inode, handle_t *handle,
+                              unsigned int from, unsigned int to,
+                              struct page *page, int zero, u64 *phys);
+/*
+ * Structures which describe a path through a btree, and functions to
+ * manipulate them.
+ *
+ * The idea here is to be as generic as possible with the tree
+ * manipulation code.
+ */
+struct ocfs2_path_item {
+        struct buffer_head              *bh;
+        struct ocfs2_extent_list        *el;
+};
+
+#define OCFS2_MAX_PATH_DEPTH    5
+
+struct ocfs2_path {
+        int                             p_tree_depth;
+        ocfs2_journal_access_func       p_root_access;
+        struct ocfs2_path_item          p_node[OCFS2_MAX_PATH_DEPTH];
+};
+
+#define path_root_bh(_path) ((_path)->p_node[0].bh)
+#define path_root_el(_path) ((_path)->p_node[0].el)
+#define path_root_access(_path)((_path)->p_root_access)
+#define path_leaf_bh(_path) ((_path)->p_node[(_path)->p_tree_depth].bh)
+#define path_leaf_el(_path) ((_path)->p_node[(_path)->p_tree_depth].el)
+#define path_num_items(_path) ((_path)->p_tree_depth + 1)
+
+void ocfs2_reinit_path(struct ocfs2_path *path, int keep_root);
+void ocfs2_free_path(struct ocfs2_path *path);
+int ocfs2_find_path(struct ocfs2_caching_info *ci,
+                    struct ocfs2_path *path,
+                    u32 cpos);
+struct ocfs2_path *ocfs2_new_path_from_path(struct ocfs2_path *path);
+struct ocfs2_path *ocfs2_new_path_from_et(struct ocfs2_extent_tree *et);
+int ocfs2_path_bh_journal_access(handle_t *handle,
+                                 struct ocfs2_caching_info *ci,
+                                 struct ocfs2_path *path,
+                                 int idx);
+int ocfs2_journal_access_path(struct ocfs2_caching_info *ci,
+                              handle_t *handle,
+                              struct ocfs2_path *path);
 #endif /* OCFS2_ALLOC_H */
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 8a1e61545f41..deb2b132ae5e 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -44,6 +44,7 @@
 #include "suballoc.h"
 #include "super.h"
 #include "symlink.h"
+#include "refcounttree.h"
 
 #include "buffer_head_io.h"
 
@@ -126,8 +127,8 @@ bail:
         return err;
 }
 
-static int ocfs2_get_block(struct inode *inode, sector_t iblock,
-                           struct buffer_head *bh_result, int create)
+int ocfs2_get_block(struct inode *inode, sector_t iblock,
+                    struct buffer_head *bh_result, int create)
 {
         int err = 0;
         unsigned int ext_flags;
@@ -590,6 +591,8 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
                 goto bail;
         }
 
+        /* We should already CoW the refcounted extent. */
+        BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
         /*
          * get_more_blocks() expects us to describe a hole by clearing
          * the mapped bit on bh_result().
@@ -687,6 +690,10 @@ static ssize_t ocfs2_direct_IO(int rw,
         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
                 return 0;
 
+        /* Fallback to buffered I/O if we are appending. */
+        if (i_size_read(inode) <= offset)
+                return 0;
+
         ret = blockdev_direct_IO_no_locking(rw, iocb, inode,
                                             inode->i_sb->s_bdev, iov, offset,
                                             nr_segs, 
@@ -1259,7 +1266,8 @@ static int ocfs2_write_cluster(struct address_space *mapping,
                         goto out;
                 }
         } else if (unwritten) {
-                ocfs2_init_dinode_extent_tree(&et, inode, wc->w_di_bh);
+                ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
+                                              wc->w_di_bh);
                 ret = ocfs2_mark_extent_written(inode, &et,
                                                 wc->w_handle, cpos, 1, phys,
                                                 meta_ac, &wc->w_dealloc);
@@ -1448,6 +1456,9 @@ static int ocfs2_populate_write_desc(struct inode *inode,
                                 goto out;
                         }
 
+                        /* We should already CoW the refcountd extent. */
+                        BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
+
                         /*
                          * Assume worst case - that we're writing in
                          * the middle of the extent.
@@ -1528,7 +1539,7 @@ static int ocfs2_write_begin_inline(struct address_space *mapping,
                 goto out;
         }
 
-        ret = ocfs2_journal_access_di(handle, inode, wc->w_di_bh,
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 ocfs2_commit_trans(osb, handle);
@@ -1699,6 +1710,19 @@ int ocfs2_write_begin_nolock(struct address_space *mapping,
                 goto out;
         }
 
+        ret = ocfs2_check_range_for_refcount(inode, pos, len);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto out;
+        } else if (ret == 1) {
+                ret = ocfs2_refcount_cow(inode, di_bh,
+                                         wc->w_cpos, wc->w_clen, UINT_MAX);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+        }
+
         ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc,
                                         &extents_to_split);
         if (ret) {
@@ -1726,7 +1750,8 @@ int ocfs2_write_begin_nolock(struct address_space *mapping,
                      (long long)i_size_read(inode), le32_to_cpu(di->i_clusters),
                      clusters_to_alloc, extents_to_split);
 
-                ocfs2_init_dinode_extent_tree(&et, inode, wc->w_di_bh);
+                ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
+                                              wc->w_di_bh);
                 ret = ocfs2_lock_allocators(inode, &et,
                                             clusters_to_alloc, extents_to_split,
                                             &data_ac, &meta_ac);
@@ -1773,7 +1798,7 @@ int ocfs2_write_begin_nolock(struct address_space *mapping,
          * We don't want this to fail in ocfs2_write_end(), so do it
          * here.
          */
-        ret = ocfs2_journal_access_di(handle, inode, wc->w_di_bh,
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
@@ -1997,4 +2022,5 @@ const struct address_space_operations ocfs2_aops = {
         .releasepage            = ocfs2_releasepage,
         .migratepage            = buffer_migrate_page,
         .is_partially_uptodate  = block_is_partially_uptodate,
+        .error_remove_page      = generic_error_remove_page,
 };
diff --git a/fs/ocfs2/aops.h b/fs/ocfs2/aops.h
index 503e49232e11..c48e93ffc513 100644
--- a/fs/ocfs2/aops.h
+++ b/fs/ocfs2/aops.h
@@ -57,6 +57,8 @@ int ocfs2_read_inline_data(struct inode *inode, struct page *page,
                            struct buffer_head *di_bh);
 int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size);
 
+int ocfs2_get_block(struct inode *inode, sector_t iblock,
+                    struct buffer_head *bh_result, int create);
 /* all ocfs2_dio_end_io()'s fault */
 #define ocfs2_iocb_is_rw_locked(iocb) \
         test_bit(0, (unsigned long *)&iocb->private)
diff --git a/fs/ocfs2/buffer_head_io.c b/fs/ocfs2/buffer_head_io.c
index 15c8e6deee2e..d43d34a1dd31 100644
--- a/fs/ocfs2/buffer_head_io.c
+++ b/fs/ocfs2/buffer_head_io.c
@@ -52,12 +52,12 @@ enum ocfs2_state_bits {
 BUFFER_FNS(NeedsValidate, needs_validate);
 
 int ocfs2_write_block(struct ocfs2_super *osb, struct buffer_head *bh,
-                      struct inode *inode)
+                      struct ocfs2_caching_info *ci)
 {
         int ret = 0;
 
-        mlog_entry("(bh->b_blocknr = %llu, inode=%p)\n",
-                   (unsigned long long)bh->b_blocknr, inode);
+        mlog_entry("(bh->b_blocknr = %llu, ci=%p)\n",
+                   (unsigned long long)bh->b_blocknr, ci);
 
         BUG_ON(bh->b_blocknr < OCFS2_SUPER_BLOCK_BLKNO);
         BUG_ON(buffer_jbd(bh));
@@ -70,7 +70,7 @@ int ocfs2_write_block(struct ocfs2_super *osb, struct buffer_head *bh,
                 goto out;
         }
 
-        mutex_lock(&OCFS2_I(inode)->ip_io_mutex);
+        ocfs2_metadata_cache_io_lock(ci);
 
         lock_buffer(bh);
         set_buffer_uptodate(bh);
@@ -85,7 +85,7 @@ int ocfs2_write_block(struct ocfs2_super *osb, struct buffer_head *bh,
         wait_on_buffer(bh);
 
         if (buffer_uptodate(bh)) {
-                ocfs2_set_buffer_uptodate(inode, bh);
+                ocfs2_set_buffer_uptodate(ci, bh);
         } else {
                 /* We don't need to remove the clustered uptodate
                  * information for this bh as it's not marked locally
@@ -94,7 +94,7 @@ int ocfs2_write_block(struct ocfs2_super *osb, struct buffer_head *bh,
                 put_bh(bh);
         }
 
-        mutex_unlock(&OCFS2_I(inode)->ip_io_mutex);
+        ocfs2_metadata_cache_io_unlock(ci);
 out:
         mlog_exit(ret);
         return ret;
@@ -177,7 +177,7 @@ bail:
         return status;
 }
 
-int ocfs2_read_blocks(struct inode *inode, u64 block, int nr,
+int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr,
                       struct buffer_head *bhs[], int flags,
                       int (*validate)(struct super_block *sb,
                                       struct buffer_head *bh))
@@ -185,11 +185,12 @@ int ocfs2_read_blocks(struct inode *inode, u64 block, int nr,
         int status = 0;
         int i, ignore_cache = 0;
         struct buffer_head *bh;
+        struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
 
-        mlog_entry("(inode=%p, block=(%llu), nr=(%d), flags=%d)\n",
-                   inode, (unsigned long long)block, nr, flags);
+        mlog_entry("(ci=%p, block=(%llu), nr=(%d), flags=%d)\n",
+                   ci, (unsigned long long)block, nr, flags);
 
-        BUG_ON(!inode);
+        BUG_ON(!ci);
         BUG_ON((flags & OCFS2_BH_READAHEAD) &&
                (flags & OCFS2_BH_IGNORE_CACHE));
 
@@ -212,12 +213,12 @@ int ocfs2_read_blocks(struct inode *inode, u64 block, int nr,
                 goto bail;
         }
 
-        mutex_lock(&OCFS2_I(inode)->ip_io_mutex);
+        ocfs2_metadata_cache_io_lock(ci);
         for (i = 0 ; i < nr ; i++) {
                 if (bhs[i] == NULL) {
-                        bhs[i] = sb_getblk(inode->i_sb, block++);
+                        bhs[i] = sb_getblk(sb, block++);
                         if (bhs[i] == NULL) {
-                                mutex_unlock(&OCFS2_I(inode)->ip_io_mutex);
+                                ocfs2_metadata_cache_io_unlock(ci);
                                 status = -EIO;
                                 mlog_errno(status);
                                 goto bail;
@@ -250,11 +251,11 @@ int ocfs2_read_blocks(struct inode *inode, u64 block, int nr,
                  *    before our is-it-in-flight check.
                  */
 
-                if (!ignore_cache && !ocfs2_buffer_uptodate(inode, bh)) {
+                if (!ignore_cache && !ocfs2_buffer_uptodate(ci, bh)) {
                         mlog(ML_UPTODATE,
-                             "bh (%llu), inode %llu not uptodate\n",
+                             "bh (%llu), owner %llu not uptodate\n",
                              (unsigned long long)bh->b_blocknr,
-                             (unsigned long long)OCFS2_I(inode)->ip_blkno);
+                             (unsigned long long)ocfs2_metadata_cache_owner(ci));
                         /* We're using ignore_cache here to say
                          * "go to disk" */
                         ignore_cache = 1;
@@ -283,7 +284,7 @@ int ocfs2_read_blocks(struct inode *inode, u64 block, int nr,
                          * previously submitted request than we are
                          * done here. */
                         if ((flags & OCFS2_BH_READAHEAD)
-                            && ocfs2_buffer_read_ahead(inode, bh))
+                            && ocfs2_buffer_read_ahead(ci, bh))
                                 continue;
 
                         lock_buffer(bh);
@@ -305,7 +306,7 @@ int ocfs2_read_blocks(struct inode *inode, u64 block, int nr,
                          * buffer lock. */
                         if (!(flags & OCFS2_BH_IGNORE_CACHE)
                             && !(flags & OCFS2_BH_READAHEAD)
-                            && ocfs2_buffer_uptodate(inode, bh)) {
+                            && ocfs2_buffer_uptodate(ci, bh)) {
                                 unlock_buffer(bh);
                                 continue;
                         }
@@ -327,7 +328,7 @@ int ocfs2_read_blocks(struct inode *inode, u64 block, int nr,
 
                 if (!(flags & OCFS2_BH_READAHEAD)) {
                         /* We know this can't have changed as we hold the
-                         * inode sem. Avoid doing any work on the bh if the
+                         * owner sem. Avoid doing any work on the bh if the
                          * journal has it. */
                         if (!buffer_jbd(bh))
                                 wait_on_buffer(bh);
@@ -351,7 +352,7 @@ int ocfs2_read_blocks(struct inode *inode, u64 block, int nr,
                                  * that better not have changed */
                                 BUG_ON(buffer_jbd(bh));
                                 clear_buffer_needs_validate(bh);
-                                status = validate(inode->i_sb, bh);
+                                status = validate(sb, bh);
                                 if (status) {
                                         put_bh(bh);
                                         bhs[i] = NULL;
@@ -363,9 +364,9 @@ int ocfs2_read_blocks(struct inode *inode, u64 block, int nr,
                 /* Always set the buffer in the cache, even if it was
                  * a forced read, or read-ahead which hasn't yet
                  * completed. */
-                ocfs2_set_buffer_uptodate(inode, bh);
+                ocfs2_set_buffer_uptodate(ci, bh);
         }
-        mutex_unlock(&OCFS2_I(inode)->ip_io_mutex);
+        ocfs2_metadata_cache_io_unlock(ci);
 
         mlog(ML_BH_IO, "block=(%llu), nr=(%d), cached=%s, flags=0x%x\n", 
              (unsigned long long)block, nr,
@@ -399,7 +400,7 @@ static void ocfs2_check_super_or_backup(struct super_block *sb,
 
 /*
  * Write super block and backups doesn't need to collaborate with journal,
- * so we don't need to lock ip_io_mutex and inode doesn't need to bea passed
+ * so we don't need to lock ip_io_mutex and ci doesn't need to bea passed
  * into this function.
  */
 int ocfs2_write_super_or_backup(struct ocfs2_super *osb,
diff --git a/fs/ocfs2/buffer_head_io.h b/fs/ocfs2/buffer_head_io.h
index c75d682dadd8..b97bcc6dde7c 100644
--- a/fs/ocfs2/buffer_head_io.h
+++ b/fs/ocfs2/buffer_head_io.h
@@ -33,7 +33,7 @@ void ocfs2_end_buffer_io_sync(struct buffer_head *bh,
 
 int ocfs2_write_block(struct ocfs2_super          *osb,
                       struct buffer_head  *bh,
-                      struct inode        *inode);
+                      struct ocfs2_caching_info   *ci);
 int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
                            unsigned int nr, struct buffer_head *bhs[]);
 
@@ -44,7 +44,7 @@ int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
  * be set even for a READAHEAD call, as it marks the buffer for later
  * validation.
  */
-int ocfs2_read_blocks(struct inode *inode, u64 block, int nr,
+int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr,
                       struct buffer_head *bhs[], int flags,
                       int (*validate)(struct super_block *sb,
                                       struct buffer_head *bh));
@@ -55,7 +55,7 @@ int ocfs2_write_super_or_backup(struct ocfs2_super *osb,
 #define OCFS2_BH_IGNORE_CACHE      1
 #define OCFS2_BH_READAHEAD         8
 
-static inline int ocfs2_read_block(struct inode *inode, u64 off,
+static inline int ocfs2_read_block(struct ocfs2_caching_info *ci, u64 off,
                                    struct buffer_head **bh,
                                    int (*validate)(struct super_block *sb,
                                                    struct buffer_head *bh))
@@ -68,7 +68,7 @@ static inline int ocfs2_read_block(struct inode *inode, u64 off,
                 goto bail;
         }
 
-        status = ocfs2_read_blocks(inode, off, 1, bh, 0, validate);
+        status = ocfs2_read_blocks(ci, off, 1, bh, 0, validate);
 
 bail:
         return status;
diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index 09cc25d04611..c452d116b892 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -966,7 +966,7 @@ static ssize_t o2hb_debug_read(struct file *file, char __user *buf,
 }
 #endif  /* CONFIG_DEBUG_FS */
 
-static struct file_operations o2hb_debug_fops = {
+static const struct file_operations o2hb_debug_fops = {
         .open =         o2hb_debug_open,
         .release =      o2hb_debug_release,
         .read =         o2hb_debug_read,
diff --git a/fs/ocfs2/cluster/masklog.c b/fs/ocfs2/cluster/masklog.c
index 96df5416993e..1cd2934de615 100644
--- a/fs/ocfs2/cluster/masklog.c
+++ b/fs/ocfs2/cluster/masklog.c
@@ -111,6 +111,7 @@ static struct mlog_attribute mlog_attrs[MLOG_MAX_BITS] = {
         define_mask(EXPORT),
         define_mask(XATTR),
         define_mask(QUOTA),
+        define_mask(REFCOUNT),
         define_mask(ERROR),
         define_mask(NOTICE),
         define_mask(KTHREAD),
diff --git a/fs/ocfs2/cluster/masklog.h b/fs/ocfs2/cluster/masklog.h
index 696c32e50716..9b4d11726cf2 100644
--- a/fs/ocfs2/cluster/masklog.h
+++ b/fs/ocfs2/cluster/masklog.h
@@ -113,6 +113,7 @@
 #define ML_EXPORT       0x0000000010000000ULL /* ocfs2 export operations */
 #define ML_XATTR        0x0000000020000000ULL /* ocfs2 extended attributes */
 #define ML_QUOTA        0x0000000040000000ULL /* ocfs2 quota operations */
+#define ML_REFCOUNT     0x0000000080000000ULL /* refcount tree operations */
 /* bits that are infrequently given and frequently matched in the high word */
 #define ML_ERROR        0x0000000100000000ULL /* sent to KERN_ERR */
 #define ML_NOTICE       0x0000000200000000ULL /* setn to KERN_NOTICE */
diff --git a/fs/ocfs2/cluster/netdebug.c b/fs/ocfs2/cluster/netdebug.c
index f8424874fa07..da794bc07a6c 100644
--- a/fs/ocfs2/cluster/netdebug.c
+++ b/fs/ocfs2/cluster/netdebug.c
@@ -163,7 +163,7 @@ static void nst_seq_stop(struct seq_file *seq, void *v)
 {
 }
 
-static struct seq_operations nst_seq_ops = {
+static const struct seq_operations nst_seq_ops = {
         .start = nst_seq_start,
         .next = nst_seq_next,
         .stop = nst_seq_stop,
@@ -207,7 +207,7 @@ static int nst_fop_release(struct inode *inode, struct file *file)
         return seq_release_private(inode, file);
 }
 
-static struct file_operations nst_seq_fops = {
+static const struct file_operations nst_seq_fops = {
         .open = nst_fop_open,
         .read = seq_read,
         .llseek = seq_lseek,
@@ -344,7 +344,7 @@ static void sc_seq_stop(struct seq_file *seq, void *v)
 {
 }
 
-static struct seq_operations sc_seq_ops = {
+static const struct seq_operations sc_seq_ops = {
         .start = sc_seq_start,
         .next = sc_seq_next,
         .stop = sc_seq_stop,
@@ -388,7 +388,7 @@ static int sc_fop_release(struct inode *inode, struct file *file)
         return seq_release_private(inode, file);
 }
 
-static struct file_operations sc_seq_fops = {
+static const struct file_operations sc_seq_fops = {
         .open = sc_fop_open,
         .read = seq_read,
         .llseek = seq_lseek,
diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c
index b358f3bf896d..28c3ec238796 100644
--- a/fs/ocfs2/dir.c
+++ b/fs/ocfs2/dir.c
@@ -176,7 +176,7 @@ static int ocfs2_dx_dir_link_trailer(struct inode *dir, handle_t *handle,
         struct ocfs2_dx_root_block *dx_root;
         struct ocfs2_dir_block_trailer *trailer;
 
-        ret = ocfs2_journal_access_dr(handle, dir, dx_root_bh,
+        ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
@@ -564,7 +564,8 @@ static int ocfs2_read_dir_block_direct(struct inode *dir, u64 phys,
         int ret;
         struct buffer_head *tmp = *bh;
 
-        ret = ocfs2_read_block(dir, phys, &tmp, ocfs2_validate_dir_block);
+        ret = ocfs2_read_block(INODE_CACHE(dir), phys, &tmp,
+                               ocfs2_validate_dir_block);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -622,7 +623,8 @@ static int ocfs2_read_dx_root(struct inode *dir, struct ocfs2_dinode *di,
         u64 blkno = le64_to_cpu(di->i_dx_root);
         struct buffer_head *tmp = *dx_root_bh;
 
-        ret = ocfs2_read_block(dir, blkno, &tmp, ocfs2_validate_dx_root);
+        ret = ocfs2_read_block(INODE_CACHE(dir), blkno, &tmp,
+                               ocfs2_validate_dx_root);
 
         /* If ocfs2_read_block() got us a new bh, pass it up. */
         if (!ret && !*dx_root_bh)
@@ -662,7 +664,8 @@ static int ocfs2_read_dx_leaf(struct inode *dir, u64 blkno,
         int ret;
         struct buffer_head *tmp = *dx_leaf_bh;
 
-        ret = ocfs2_read_block(dir, blkno, &tmp, ocfs2_validate_dx_leaf);
+        ret = ocfs2_read_block(INODE_CACHE(dir), blkno, &tmp,
+                               ocfs2_validate_dx_leaf);
 
         /* If ocfs2_read_block() got us a new bh, pass it up. */
         if (!ret && !*dx_leaf_bh)
@@ -680,7 +683,7 @@ static int ocfs2_read_dx_leaves(struct inode *dir, u64 start, int num,
 {
         int ret;
 
-        ret = ocfs2_read_blocks(dir, start, num, dx_leaf_bhs, 0,
+        ret = ocfs2_read_blocks(INODE_CACHE(dir), start, num, dx_leaf_bhs, 0,
                                 ocfs2_validate_dx_leaf);
         if (ret)
                 mlog_errno(ret);
@@ -802,7 +805,8 @@ static int ocfs2_dx_dir_lookup_rec(struct inode *inode,
         struct ocfs2_extent_rec *rec = NULL;
 
         if (el->l_tree_depth) {
-                ret = ocfs2_find_leaf(inode, el, major_hash, &eb_bh);
+                ret = ocfs2_find_leaf(INODE_CACHE(inode), el, major_hash,
+                                      &eb_bh);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -1133,7 +1137,8 @@ int ocfs2_update_entry(struct inode *dir, handle_t *handle,
         if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
                 access = ocfs2_journal_access_di;
 
-        ret = access(handle, dir, de_bh, OCFS2_JOURNAL_ACCESS_WRITE);
+        ret = access(handle, INODE_CACHE(dir), de_bh,
+                     OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -1176,7 +1181,7 @@ static int __ocfs2_delete_entry(handle_t *handle, struct inode *dir,
                         goto bail;
                 }
                 if (de == de_del)  {
-                        status = access(handle, dir, bh,
+                        status = access(handle, INODE_CACHE(dir), bh,
                                         OCFS2_JOURNAL_ACCESS_WRITE);
                         if (status < 0) {
                                 status = -EIO;
@@ -1326,7 +1331,7 @@ static int ocfs2_delete_entry_dx(handle_t *handle, struct inode *dir,
          * the entry count needs to be updated. Also, we might be
          * adding to the start of the free list.
          */
-        ret = ocfs2_journal_access_dr(handle, dir, dx_root_bh,
+        ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
@@ -1334,7 +1339,7 @@ static int ocfs2_delete_entry_dx(handle_t *handle, struct inode *dir,
         }
 
         if (!ocfs2_dx_root_inline(dx_root)) {
-                ret = ocfs2_journal_access_dl(handle, dir,
+                ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir),
                                               lookup->dl_dx_leaf_bh,
                                               OCFS2_JOURNAL_ACCESS_WRITE);
                 if (ret) {
@@ -1493,7 +1498,7 @@ static int __ocfs2_dx_dir_leaf_insert(struct inode *dir, handle_t *handle,
         int ret;
         struct ocfs2_dx_leaf *dx_leaf;
 
-        ret = ocfs2_journal_access_dl(handle, dir, dx_leaf_bh,
+        ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir), dx_leaf_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
@@ -1523,7 +1528,7 @@ static int ocfs2_dx_dir_insert(struct inode *dir, handle_t *handle,
         struct ocfs2_dx_root_block *dx_root;
         struct buffer_head *dx_root_bh = lookup->dl_dx_root_bh;
 
-        ret = ocfs2_journal_access_dr(handle, dir, dx_root_bh,
+        ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
@@ -1645,11 +1650,13 @@ int __ocfs2_add_entry(handle_t *handle,
                  */
                 if (ocfs2_free_list_at_root(lookup)) {
                         bh = lookup->dl_dx_root_bh;
-                        retval = ocfs2_journal_access_dr(handle, dir, bh,
+                        retval = ocfs2_journal_access_dr(handle,
+                                                 INODE_CACHE(dir), bh,
                                                  OCFS2_JOURNAL_ACCESS_WRITE);
                 } else {
                         bh = lookup->dl_prev_leaf_bh;
-                        retval = ocfs2_journal_access_db(handle, dir, bh,
+                        retval = ocfs2_journal_access_db(handle,
+                                                 INODE_CACHE(dir), bh,
                                                  OCFS2_JOURNAL_ACCESS_WRITE);
                 }
                 if (retval) {
@@ -1700,11 +1707,13 @@ int __ocfs2_add_entry(handle_t *handle,
                         }
 
                         if (insert_bh == parent_fe_bh)
-                                status = ocfs2_journal_access_di(handle, dir,
+                                status = ocfs2_journal_access_di(handle,
+                                                                 INODE_CACHE(dir),
                                                                  insert_bh,
                                                                  OCFS2_JOURNAL_ACCESS_WRITE);
                         else {
-                                status = ocfs2_journal_access_db(handle, dir,
+                                status = ocfs2_journal_access_db(handle,
+                                                                 INODE_CACHE(dir),
                                                                  insert_bh,
                                               OCFS2_JOURNAL_ACCESS_WRITE);
 
@@ -2280,7 +2289,7 @@ static int ocfs2_fill_new_dir_id(struct ocfs2_super *osb,
         struct ocfs2_inline_data *data = &di->id2.i_data;
         unsigned int size = le16_to_cpu(data->id_count);
 
-        ret = ocfs2_journal_access_di(handle, inode, di_bh,
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
@@ -2332,9 +2341,9 @@ static int ocfs2_fill_new_dir_el(struct ocfs2_super *osb,
                 goto bail;
         }
 
-        ocfs2_set_new_buffer_uptodate(inode, new_bh);
+        ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
 
-        status = ocfs2_journal_access_db(handle, inode, new_bh,
+        status = ocfs2_journal_access_db(handle, INODE_CACHE(inode), new_bh,
                                          OCFS2_JOURNAL_ACCESS_CREATE);
         if (status < 0) {
                 mlog_errno(status);
@@ -2418,9 +2427,9 @@ static int ocfs2_dx_dir_attach_index(struct ocfs2_super *osb,
                 ret = -EIO;
                 goto out;
         }
-        ocfs2_set_new_buffer_uptodate(dir, dx_root_bh);
+        ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), dx_root_bh);
 
-        ret = ocfs2_journal_access_dr(handle, dir, dx_root_bh,
+        ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh,
                                       OCFS2_JOURNAL_ACCESS_CREATE);
         if (ret < 0) {
                 mlog_errno(ret);
@@ -2454,7 +2463,7 @@ static int ocfs2_dx_dir_attach_index(struct ocfs2_super *osb,
         if (ret)
                 mlog_errno(ret);
 
-        ret = ocfs2_journal_access_di(handle, dir, di_bh,
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(dir), di_bh,
                                       OCFS2_JOURNAL_ACCESS_CREATE);
         if (ret) {
                 mlog_errno(ret);
@@ -2495,9 +2504,9 @@ static int ocfs2_dx_dir_format_cluster(struct ocfs2_super *osb,
                 }
                 dx_leaves[i] = bh;
 
-                ocfs2_set_new_buffer_uptodate(dir, bh);
+                ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), bh);
 
-                ret = ocfs2_journal_access_dl(handle, dir, bh,
+                ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir), bh,
                                               OCFS2_JOURNAL_ACCESS_CREATE);
                 if (ret < 0) {
                         mlog_errno(ret);
@@ -2582,7 +2591,6 @@ static int ocfs2_dx_dir_new_cluster(struct inode *dir,
 {
         int ret;
         u64 phys_blkno;
-        struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 
         ret = __ocfs2_dx_dir_new_cluster(dir, cpos, handle, data_ac, dx_leaves,
                                          num_dx_leaves, &phys_blkno);
@@ -2591,7 +2599,7 @@ static int ocfs2_dx_dir_new_cluster(struct inode *dir,
                 goto out;
         }
 
-        ret = ocfs2_insert_extent(osb, handle, dir, et, cpos, phys_blkno, 1, 0,
+        ret = ocfs2_insert_extent(handle, et, cpos, phys_blkno, 1, 0,
                                   meta_ac);
         if (ret)
                 mlog_errno(ret);
@@ -2895,7 +2903,7 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
         struct ocfs2_extent_tree dx_et;
         int did_quota = 0, bytes_allocated = 0;
 
-        ocfs2_init_dinode_extent_tree(&et, dir, di_bh);
+        ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(dir), di_bh);
 
         alloc = ocfs2_clusters_for_bytes(sb, bytes);
         dx_alloc = 0;
@@ -3005,9 +3013,9 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
                 goto out_commit;
         }
 
-        ocfs2_set_new_buffer_uptodate(dir, dirdata_bh);
+        ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), dirdata_bh);
 
-        ret = ocfs2_journal_access_db(handle, dir, dirdata_bh,
+        ret = ocfs2_journal_access_db(handle, INODE_CACHE(dir), dirdata_bh,
                                       OCFS2_JOURNAL_ACCESS_CREATE);
         if (ret) {
                 mlog_errno(ret);
@@ -3060,7 +3068,7 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
          * We let the later dirent insert modify c/mtime - to the user
          * the data hasn't changed.
          */
-        ret = ocfs2_journal_access_di(handle, dir, di_bh,
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(dir), di_bh,
                                       OCFS2_JOURNAL_ACCESS_CREATE);
         if (ret) {
                 mlog_errno(ret);
@@ -3085,7 +3093,7 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
          * This should never fail as our extent list is empty and all
          * related blocks have been journaled already.
          */
-        ret = ocfs2_insert_extent(osb, handle, dir, &et, 0, blkno, len,
+        ret = ocfs2_insert_extent(handle, &et, 0, blkno, len,
                                   0, NULL);
         if (ret) {
                 mlog_errno(ret);
@@ -3117,8 +3125,10 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
                         ocfs2_dx_dir_index_root_block(dir, dx_root_bh,
                                                       dirdata_bh);
                 } else {
-                        ocfs2_init_dx_root_extent_tree(&dx_et, dir, dx_root_bh);
-                        ret = ocfs2_insert_extent(osb, handle, dir, &dx_et, 0,
+                        ocfs2_init_dx_root_extent_tree(&dx_et,
+                                                       INODE_CACHE(dir),
+                                                       dx_root_bh);
+                        ret = ocfs2_insert_extent(handle, &dx_et, 0,
                                                   dx_insert_blkno, 1, 0, NULL);
                         if (ret)
                                 mlog_errno(ret);
@@ -3138,7 +3148,7 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
                 }
                 blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off);
 
-                ret = ocfs2_insert_extent(osb, handle, dir, &et, 1,
+                ret = ocfs2_insert_extent(handle, &et, 1,
                                           blkno, len, 0, NULL);
                 if (ret) {
                         mlog_errno(ret);
@@ -3337,8 +3347,9 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
         spin_lock(&OCFS2_I(dir)->ip_lock);
         if (dir_i_size == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)) {
                 spin_unlock(&OCFS2_I(dir)->ip_lock);
-                ocfs2_init_dinode_extent_tree(&et, dir, parent_fe_bh);
-                num_free_extents = ocfs2_num_free_extents(osb, dir, &et);
+                ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(dir),
+                                              parent_fe_bh);
+                num_free_extents = ocfs2_num_free_extents(osb, &et);
                 if (num_free_extents < 0) {
                         status = num_free_extents;
                         mlog_errno(status);
@@ -3387,9 +3398,9 @@ do_extend:
                 goto bail;
         }
 
-        ocfs2_set_new_buffer_uptodate(dir, new_bh);
+        ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), new_bh);
 
-        status = ocfs2_journal_access_db(handle, dir, new_bh,
+        status = ocfs2_journal_access_db(handle, INODE_CACHE(dir), new_bh,
                                          OCFS2_JOURNAL_ACCESS_CREATE);
         if (status < 0) {
                 mlog_errno(status);
@@ -3829,7 +3840,7 @@ static int ocfs2_dx_dir_rebalance(struct ocfs2_super *osb, struct inode *dir,
              (unsigned long long)OCFS2_I(dir)->ip_blkno,
              (unsigned long long)leaf_blkno, insert_hash);
 
-        ocfs2_init_dx_root_extent_tree(&et, dir, dx_root_bh);
+        ocfs2_init_dx_root_extent_tree(&et, INODE_CACHE(dir), dx_root_bh);
 
         dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
         /*
@@ -3885,7 +3896,7 @@ static int ocfs2_dx_dir_rebalance(struct ocfs2_super *osb, struct inode *dir,
         }
         did_quota = 1;
 
-        ret = ocfs2_journal_access_dl(handle, dir, dx_leaf_bh,
+        ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir), dx_leaf_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
@@ -3949,7 +3960,8 @@ static int ocfs2_dx_dir_rebalance(struct ocfs2_super *osb, struct inode *dir,
         }
 
         for (i = 0; i < num_dx_leaves; i++) {
-                ret = ocfs2_journal_access_dl(handle, dir, orig_dx_leaves[i],
+                ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir),
+                                              orig_dx_leaves[i],
                                               OCFS2_JOURNAL_ACCESS_WRITE);
                 if (ret) {
                         mlog_errno(ret);
@@ -4165,7 +4177,7 @@ static int ocfs2_expand_inline_dx_root(struct inode *dir,
          * failure to add the dx_root_bh to the journal won't result
          * us losing clusters.
          */
-        ret = ocfs2_journal_access_dr(handle, dir, dx_root_bh,
+        ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
@@ -4207,9 +4219,8 @@ static int ocfs2_expand_inline_dx_root(struct inode *dir,
 
         /* This should never fail considering we start with an empty
          * dx_root. */
-        ocfs2_init_dx_root_extent_tree(&et, dir, dx_root_bh);
-        ret = ocfs2_insert_extent(osb, handle, dir, &et, 0,
-                                  insert_blkno, 1, 0, NULL);
+        ocfs2_init_dx_root_extent_tree(&et, INODE_CACHE(dir), dx_root_bh);
+        ret = ocfs2_insert_extent(handle, &et, 0, insert_blkno, 1, 0, NULL);
         if (ret)
                 mlog_errno(ret);
         did_quota = 0;
@@ -4469,7 +4480,7 @@ static int ocfs2_dx_dir_remove_index(struct inode *dir,
                 goto out_unlock;
         }
 
-        ret = ocfs2_journal_access_di(handle, dir, di_bh,
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(dir), di_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
@@ -4532,7 +4543,7 @@ int ocfs2_dx_dir_truncate(struct inode *dir, struct buffer_head *di_bh)
         if (ocfs2_dx_root_inline(dx_root))
                 goto remove_index;
 
-        ocfs2_init_dx_root_extent_tree(&et, dir, dx_root_bh);
+        ocfs2_init_dx_root_extent_tree(&et, INODE_CACHE(dir), dx_root_bh);
 
         /* XXX: What if dr_clusters is too large? */
         while (le32_to_cpu(dx_root->dr_clusters)) {
@@ -4565,7 +4576,7 @@ remove_index:
                 goto out;
         }
 
-        ocfs2_remove_from_cache(dir, dx_root_bh);
+        ocfs2_remove_from_cache(INODE_CACHE(dir), dx_root_bh);
 out:
         ocfs2_schedule_truncate_log_flush(osb, 1);
         ocfs2_run_deallocs(osb, &dealloc);
diff --git a/fs/ocfs2/dlm/dlmast.c b/fs/ocfs2/dlm/dlmast.c
index 81eff8e58322..01cf8cc3d286 100644
--- a/fs/ocfs2/dlm/dlmast.c
+++ b/fs/ocfs2/dlm/dlmast.c
@@ -30,7 +30,6 @@
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/highmem.h>
-#include <linux/utsname.h>
 #include <linux/init.h>
 #include <linux/sysctl.h>
 #include <linux/random.h>
diff --git a/fs/ocfs2/dlm/dlmconvert.c b/fs/ocfs2/dlm/dlmconvert.c
index 75997b4deaf3..ca96bce50e18 100644
--- a/fs/ocfs2/dlm/dlmconvert.c
+++ b/fs/ocfs2/dlm/dlmconvert.c
@@ -30,7 +30,6 @@
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/highmem.h>
-#include <linux/utsname.h>
 #include <linux/init.h>
 #include <linux/sysctl.h>
 #include <linux/random.h>
diff --git a/fs/ocfs2/dlm/dlmdebug.c b/fs/ocfs2/dlm/dlmdebug.c
index df52f706f669..42b0bad7a612 100644
--- a/fs/ocfs2/dlm/dlmdebug.c
+++ b/fs/ocfs2/dlm/dlmdebug.c
@@ -27,7 +27,6 @@
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/highmem.h>
-#include <linux/utsname.h>
 #include <linux/sysctl.h>
 #include <linux/spinlock.h>
 #include <linux/debugfs.h>
@@ -479,7 +478,7 @@ bail:
         return -ENOMEM;
 }
 
-static struct file_operations debug_purgelist_fops = {
+static const struct file_operations debug_purgelist_fops = {
         .open =         debug_purgelist_open,
         .release =      debug_buffer_release,
         .read =         debug_buffer_read,
@@ -539,7 +538,7 @@ bail:
         return -ENOMEM;
 }
 
-static struct file_operations debug_mle_fops = {
+static const struct file_operations debug_mle_fops = {
         .open =         debug_mle_open,
         .release =      debug_buffer_release,
         .read =         debug_buffer_read,
@@ -683,7 +682,7 @@ static int lockres_seq_show(struct seq_file *s, void *v)
         return 0;
 }
 
-static struct seq_operations debug_lockres_ops = {
+static const struct seq_operations debug_lockres_ops = {
         .start =        lockres_seq_start,
         .stop =         lockres_seq_stop,
         .next =         lockres_seq_next,
@@ -742,7 +741,7 @@ static int debug_lockres_release(struct inode *inode, struct file *file)
         return seq_release_private(inode, file);
 }
 
-static struct file_operations debug_lockres_fops = {
+static const struct file_operations debug_lockres_fops = {
         .open =         debug_lockres_open,
         .release =      debug_lockres_release,
         .read =         seq_read,
@@ -926,7 +925,7 @@ bail:
         return -ENOMEM;
 }
 
-static struct file_operations debug_state_fops = {
+static const struct file_operations debug_state_fops = {
         .open =         debug_state_open,
         .release =      debug_buffer_release,
         .read =         debug_buffer_read,
diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c
index 4d9e6b288dd8..0334000676d3 100644
--- a/fs/ocfs2/dlm/dlmdomain.c
+++ b/fs/ocfs2/dlm/dlmdomain.c
@@ -28,7 +28,6 @@
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/highmem.h>
-#include <linux/utsname.h>
 #include <linux/init.h>
 #include <linux/spinlock.h>
 #include <linux/delay.h>
diff --git a/fs/ocfs2/dlm/dlmlock.c b/fs/ocfs2/dlm/dlmlock.c
index 83a9f2972ac8..437698e9465f 100644
--- a/fs/ocfs2/dlm/dlmlock.c
+++ b/fs/ocfs2/dlm/dlmlock.c
@@ -30,7 +30,6 @@
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/highmem.h>
-#include <linux/utsname.h>
 #include <linux/init.h>
 #include <linux/sysctl.h>
 #include <linux/random.h>
diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
index f8b653fcd4dd..83bcaf266b35 100644
--- a/fs/ocfs2/dlm/dlmmaster.c
+++ b/fs/ocfs2/dlm/dlmmaster.c
@@ -30,7 +30,6 @@
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/highmem.h>
-#include <linux/utsname.h>
 #include <linux/init.h>
 #include <linux/sysctl.h>
 #include <linux/random.h>
diff --git a/fs/ocfs2/dlm/dlmrecovery.c b/fs/ocfs2/dlm/dlmrecovery.c
index 43e6e3280569..d9fa3d22e17c 100644
--- a/fs/ocfs2/dlm/dlmrecovery.c
+++ b/fs/ocfs2/dlm/dlmrecovery.c
@@ -30,7 +30,6 @@
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/highmem.h>
-#include <linux/utsname.h>
 #include <linux/init.h>
 #include <linux/sysctl.h>
 #include <linux/random.h>
diff --git a/fs/ocfs2/dlm/dlmthread.c b/fs/ocfs2/dlm/dlmthread.c
index d490b66ad9d7..52ec020ea78b 100644
--- a/fs/ocfs2/dlm/dlmthread.c
+++ b/fs/ocfs2/dlm/dlmthread.c
@@ -30,7 +30,6 @@
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/highmem.h>
-#include <linux/utsname.h>
 #include <linux/init.h>
 #include <linux/sysctl.h>
 #include <linux/random.h>
@@ -212,14 +211,18 @@ static int dlm_purge_lockres(struct dlm_ctxt *dlm,
                 spin_lock(&dlm->spinlock);
         }
 
+        spin_lock(&res->spinlock);
         if (!list_empty(&res->purge)) {
                 mlog(0, "removing lockres %.*s:%p from purgelist, "
                      "master = %d\n", res->lockname.len, res->lockname.name,
                      res, master);
                 list_del_init(&res->purge);
+                spin_unlock(&res->spinlock);
                 dlm_lockres_put(res);
                 dlm->purge_count--;
-        }
+        } else
+                spin_unlock(&res->spinlock);
+
         __dlm_unhash_lockres(res);
 
         /* lockres is not in the hash now.  drop the flag and wake up
diff --git a/fs/ocfs2/dlm/dlmunlock.c b/fs/ocfs2/dlm/dlmunlock.c
index 756f5b0998e0..00f53b2aea76 100644
--- a/fs/ocfs2/dlm/dlmunlock.c
+++ b/fs/ocfs2/dlm/dlmunlock.c
@@ -30,7 +30,6 @@
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/highmem.h>
-#include <linux/utsname.h>
 #include <linux/init.h>
 #include <linux/sysctl.h>
 #include <linux/random.h>
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 110bb57c46ab..0d38d67194cb 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -53,6 +53,7 @@
 #include "super.h"
 #include "uptodate.h"
 #include "quota.h"
+#include "refcounttree.h"
 
 #include "buffer_head_io.h"
 
@@ -110,6 +111,11 @@ static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb,
 
 static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres);
 
+static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres,
+                                            int new_level);
+static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres,
+                                         int blocking);
+
 #define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres)
 
 /* This aids in debugging situations where a bad LVB might be involved. */
@@ -278,6 +284,12 @@ static struct ocfs2_lock_res_ops ocfs2_qinfo_lops = {
         .flags          = LOCK_TYPE_REQUIRES_REFRESH | LOCK_TYPE_USES_LVB,
 };
 
+static struct ocfs2_lock_res_ops ocfs2_refcount_block_lops = {
+        .check_downconvert = ocfs2_check_refcount_downconvert,
+        .downconvert_worker = ocfs2_refcount_convert_worker,
+        .flags          = 0,
+};
+
 static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres)
 {
         return lockres->l_type == OCFS2_LOCK_TYPE_META ||
@@ -306,6 +318,12 @@ static inline struct ocfs2_mem_dqinfo *ocfs2_lock_res_qinfo(struct ocfs2_lock_re
         return (struct ocfs2_mem_dqinfo *)lockres->l_priv;
 }
 
+static inline struct ocfs2_refcount_tree *
+ocfs2_lock_res_refcount_tree(struct ocfs2_lock_res *res)
+{
+        return container_of(res, struct ocfs2_refcount_tree, rf_lockres);
+}
+
 static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres)
 {
         if (lockres->l_ops->get_osb)
@@ -693,6 +711,17 @@ void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres,
                                    info);
 }
 
+void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres,
+                                  struct ocfs2_super *osb, u64 ref_blkno,
+                                  unsigned int generation)
+{
+        ocfs2_lock_res_init_once(lockres);
+        ocfs2_build_lock_name(OCFS2_LOCK_TYPE_REFCOUNT, ref_blkno,
+                              generation, lockres->l_name);
+        ocfs2_lock_res_init_common(osb, lockres, OCFS2_LOCK_TYPE_REFCOUNT,
+                                   &ocfs2_refcount_block_lops, osb);
+}
+
 void ocfs2_lock_res_free(struct ocfs2_lock_res *res)
 {
         mlog_entry_void();
@@ -1548,8 +1577,10 @@ int ocfs2_rw_lock(struct inode *inode, int write)
              (unsigned long long)OCFS2_I(inode)->ip_blkno,
              write ? "EXMODE" : "PRMODE");
 
-        if (ocfs2_mount_local(osb))
+        if (ocfs2_mount_local(osb)) {
+                mlog_exit(0);
                 return 0;
+        }
 
         lockres = &OCFS2_I(inode)->ip_rw_lockres;
 
@@ -2127,7 +2158,7 @@ static int ocfs2_inode_lock_update(struct inode *inode,
 
         /* This will discard any caching information we might have had
          * for the inode metadata. */
-        ocfs2_metadata_cache_purge(inode);
+        ocfs2_metadata_cache_purge(INODE_CACHE(inode));
 
         ocfs2_extent_map_trunc(inode, 0);
 
@@ -3009,6 +3040,7 @@ static void ocfs2_unlock_ast(void *opaque, int error)
                      "unlock_action %d\n", error, lockres->l_name,
                      lockres->l_unlock_action);
                 spin_unlock_irqrestore(&lockres->l_lock, flags);
+                mlog_exit_void();
                 return;
         }
 
@@ -3495,11 +3527,11 @@ out:
         return UNBLOCK_CONTINUE;
 }
 
-static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres,
-                                        int new_level)
+static int ocfs2_ci_checkpointed(struct ocfs2_caching_info *ci,
+                                 struct ocfs2_lock_res *lockres,
+                                 int new_level)
 {
-        struct inode *inode = ocfs2_lock_res_inode(lockres);
-        int checkpointed = ocfs2_inode_fully_checkpointed(inode);
+        int checkpointed = ocfs2_ci_fully_checkpointed(ci);
 
         BUG_ON(new_level != DLM_LOCK_NL && new_level != DLM_LOCK_PR);
         BUG_ON(lockres->l_level != DLM_LOCK_EX && !checkpointed);
@@ -3507,10 +3539,18 @@ static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres,
         if (checkpointed)
                 return 1;
 
-        ocfs2_start_checkpoint(OCFS2_SB(inode->i_sb));
+        ocfs2_start_checkpoint(OCFS2_SB(ocfs2_metadata_cache_get_super(ci)));
         return 0;
 }
 
+static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres,
+                                        int new_level)
+{
+        struct inode *inode = ocfs2_lock_res_inode(lockres);
+
+        return ocfs2_ci_checkpointed(INODE_CACHE(inode), lockres, new_level);
+}
+
 static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres)
 {
         struct inode *inode = ocfs2_lock_res_inode(lockres);
@@ -3640,6 +3680,26 @@ static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres,
         return UNBLOCK_CONTINUE_POST;
 }
 
+static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres,
+                                            int new_level)
+{
+        struct ocfs2_refcount_tree *tree =
+                                ocfs2_lock_res_refcount_tree(lockres);
+
+        return ocfs2_ci_checkpointed(&tree->rf_ci, lockres, new_level);
+}
+
+static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres,
+                                         int blocking)
+{
+        struct ocfs2_refcount_tree *tree =
+                                ocfs2_lock_res_refcount_tree(lockres);
+
+        ocfs2_metadata_cache_purge(&tree->rf_ci);
+
+        return UNBLOCK_CONTINUE;
+}
+
 static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres)
 {
         struct ocfs2_qinfo_lvb *lvb;
@@ -3752,6 +3812,37 @@ bail:
         return status;
 }
 
+int ocfs2_refcount_lock(struct ocfs2_refcount_tree *ref_tree, int ex)
+{
+        int status;
+        int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
+        struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres;
+        struct ocfs2_super *osb = lockres->l_priv;
+
+
+        if (ocfs2_is_hard_readonly(osb))
+                return -EROFS;
+
+        if (ocfs2_mount_local(osb))
+                return 0;
+
+        status = ocfs2_cluster_lock(osb, lockres, level, 0, 0);
+        if (status < 0)
+                mlog_errno(status);
+
+        return status;
+}
+
+void ocfs2_refcount_unlock(struct ocfs2_refcount_tree *ref_tree, int ex)
+{
+        int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
+        struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres;
+        struct ocfs2_super *osb = lockres->l_priv;
+
+        if (!ocfs2_mount_local(osb))
+                ocfs2_cluster_unlock(osb, lockres, level);
+}
+
 /*
  * This is the filesystem locking protocol.  It provides the lock handling
  * hooks for the underlying DLM.  It has a maximum version number.
diff --git a/fs/ocfs2/dlmglue.h b/fs/ocfs2/dlmglue.h
index 7553836931de..d1ce48e1b3d6 100644
--- a/fs/ocfs2/dlmglue.h
+++ b/fs/ocfs2/dlmglue.h
@@ -101,6 +101,9 @@ void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres,
 struct ocfs2_mem_dqinfo;
 void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres,
                                struct ocfs2_mem_dqinfo *info);
+void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres,
+                                  struct ocfs2_super *osb, u64 ref_blkno,
+                                  unsigned int generation);
 void ocfs2_lock_res_free(struct ocfs2_lock_res *res);
 int ocfs2_create_new_inode_locks(struct inode *inode);
 int ocfs2_drop_inode_locks(struct inode *inode);
@@ -148,6 +151,9 @@ int ocfs2_file_lock(struct file *file, int ex, int trylock);
 void ocfs2_file_unlock(struct file *file);
 int ocfs2_qinfo_lock(struct ocfs2_mem_dqinfo *oinfo, int ex);
 void ocfs2_qinfo_unlock(struct ocfs2_mem_dqinfo *oinfo, int ex);
+struct ocfs2_refcount_tree;
+int ocfs2_refcount_lock(struct ocfs2_refcount_tree *ref_tree, int ex);
+void ocfs2_refcount_unlock(struct ocfs2_refcount_tree *ref_tree, int ex);
 
 
 void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres);
diff --git a/fs/ocfs2/extent_map.c b/fs/ocfs2/extent_map.c
index f2bb1a04d253..843db64e9d4a 100644
--- a/fs/ocfs2/extent_map.c
+++ b/fs/ocfs2/extent_map.c
@@ -293,7 +293,7 @@ static int ocfs2_last_eb_is_empty(struct inode *inode,
         struct ocfs2_extent_block *eb;
         struct ocfs2_extent_list *el;
 
-        ret = ocfs2_read_extent_block(inode, last_eb_blk, &eb_bh);
+        ret = ocfs2_read_extent_block(INODE_CACHE(inode), last_eb_blk, &eb_bh);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -353,11 +353,11 @@ static int ocfs2_search_for_hole_index(struct ocfs2_extent_list *el,
  * eb_bh is NULL. Otherwise, eb_bh should point to the extent block
  * containing el.
  */
-static int ocfs2_figure_hole_clusters(struct inode *inode,
-                                      struct ocfs2_extent_list *el,
-                                      struct buffer_head *eb_bh,
-                                      u32 v_cluster,
-                                      u32 *num_clusters)
+int ocfs2_figure_hole_clusters(struct ocfs2_caching_info *ci,
+                               struct ocfs2_extent_list *el,
+                               struct buffer_head *eb_bh,
+                               u32 v_cluster,
+                               u32 *num_clusters)
 {
         int ret, i;
         struct buffer_head *next_eb_bh = NULL;
@@ -375,7 +375,7 @@ static int ocfs2_figure_hole_clusters(struct inode *inode,
                 if (le64_to_cpu(eb->h_next_leaf_blk) == 0ULL)
                         goto no_more_extents;
 
-                ret = ocfs2_read_extent_block(inode,
+                ret = ocfs2_read_extent_block(ci,
                                               le64_to_cpu(eb->h_next_leaf_blk),
                                               &next_eb_bh);
                 if (ret) {
@@ -428,7 +428,8 @@ static int ocfs2_get_clusters_nocache(struct inode *inode,
         tree_height = le16_to_cpu(el->l_tree_depth);
 
         if (tree_height > 0) {
-                ret = ocfs2_find_leaf(inode, el, v_cluster, &eb_bh);
+                ret = ocfs2_find_leaf(INODE_CACHE(inode), el, v_cluster,
+                                      &eb_bh);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -455,7 +456,8 @@ static int ocfs2_get_clusters_nocache(struct inode *inode,
                  * field.
                  */
                 if (hole_len) {
-                        ret = ocfs2_figure_hole_clusters(inode, el, eb_bh,
+                        ret = ocfs2_figure_hole_clusters(INODE_CACHE(inode),
+                                                         el, eb_bh,
                                                          v_cluster, &len);
                         if (ret) {
                                 mlog_errno(ret);
@@ -539,7 +541,8 @@ static void ocfs2_relative_extent_offsets(struct super_block *sb,
 
 int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,
                              u32 *p_cluster, u32 *num_clusters,
-                             struct ocfs2_extent_list *el)
+                             struct ocfs2_extent_list *el,
+                             unsigned int *extent_flags)
 {
         int ret = 0, i;
         struct buffer_head *eb_bh = NULL;
@@ -548,7 +551,8 @@ int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,
         u32 coff;
 
         if (el->l_tree_depth) {
-                ret = ocfs2_find_leaf(inode, el, v_cluster, &eb_bh);
+                ret = ocfs2_find_leaf(INODE_CACHE(inode), el, v_cluster,
+                                      &eb_bh);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -590,6 +594,9 @@ int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,
                 *p_cluster = *p_cluster + coff;
                 if (num_clusters)
                         *num_clusters = ocfs2_rec_clusters(el, rec) - coff;
+
+                if (extent_flags)
+                        *extent_flags = rec->e_flags;
         }
 out:
         if (eb_bh)
@@ -862,8 +869,8 @@ int ocfs2_read_virt_blocks(struct inode *inode, u64 v_block, int nr,
                         BUG_ON(bhs[done + i]->b_blocknr != (p_block + i));
                 }
 
-                rc = ocfs2_read_blocks(inode, p_block, count, bhs + done,
-                                       flags, validate);
+                rc = ocfs2_read_blocks(INODE_CACHE(inode), p_block, count,
+                                       bhs + done, flags, validate);
                 if (rc) {
                         mlog_errno(rc);
                         break;
diff --git a/fs/ocfs2/extent_map.h b/fs/ocfs2/extent_map.h
index b7dd9731b462..e79d41c2c909 100644
--- a/fs/ocfs2/extent_map.h
+++ b/fs/ocfs2/extent_map.h
@@ -55,12 +55,18 @@ int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 
 int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,
                              u32 *p_cluster, u32 *num_clusters,
-                             struct ocfs2_extent_list *el);
+                             struct ocfs2_extent_list *el,
+                             unsigned int *extent_flags);
 
 int ocfs2_read_virt_blocks(struct inode *inode, u64 v_block, int nr,
                            struct buffer_head *bhs[], int flags,
                            int (*validate)(struct super_block *sb,
                                            struct buffer_head *bh));
+int ocfs2_figure_hole_clusters(struct ocfs2_caching_info *ci,
+                               struct ocfs2_extent_list *el,
+                               struct buffer_head *eb_bh,
+                               u32 v_cluster,
+                               u32 *num_clusters);
 static inline int ocfs2_read_virt_block(struct inode *inode, u64 v_block,
                                         struct buffer_head **bh,
                                         int (*validate)(struct super_block *sb,
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 221c5e98957b..89fc8ee1f5a5 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -59,6 +59,7 @@
 #include "xattr.h"
 #include "acl.h"
 #include "quota.h"
+#include "refcounttree.h"
 
 #include "buffer_head_io.h"
 
@@ -259,7 +260,7 @@ int ocfs2_update_inode_atime(struct inode *inode,
                 goto out;
         }
 
-        ret = ocfs2_journal_access_di(handle, inode, bh,
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
@@ -334,6 +335,39 @@ out:
         return ret;
 }
 
+static int ocfs2_cow_file_pos(struct inode *inode,
+                              struct buffer_head *fe_bh,
+                              u64 offset)
+{
+        int status;
+        u32 phys, cpos = offset >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
+        unsigned int num_clusters = 0;
+        unsigned int ext_flags = 0;
+
+        /*
+         * If the new offset is aligned to the range of the cluster, there is
+         * no space for ocfs2_zero_range_for_truncate to fill, so no need to
+         * CoW either.
+         */
+        if ((offset & (OCFS2_SB(inode->i_sb)->s_clustersize - 1)) == 0)
+                return 0;
+
+        status = ocfs2_get_clusters(inode, cpos, &phys,
+                                    &num_clusters, &ext_flags);
+        if (status) {
+                mlog_errno(status);
+                goto out;
+        }
+
+        if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
+                goto out;
+
+        return ocfs2_refcount_cow(inode, fe_bh, cpos, 1, cpos+1);
+
+out:
+        return status;
+}
+
 static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
                                      struct inode *inode,
                                      struct buffer_head *fe_bh,
@@ -346,6 +380,17 @@ static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
 
         mlog_entry_void();
 
+        /*
+         * We need to CoW the cluster contains the offset if it is reflinked
+         * since we will call ocfs2_zero_range_for_truncate later which will
+         * write "0" from offset to the end of the cluster.
+         */
+        status = ocfs2_cow_file_pos(inode, fe_bh, new_i_size);
+        if (status) {
+                mlog_errno(status);
+                return status;
+        }
+
         /* TODO: This needs to actually orphan the inode in this
          * transaction. */
 
@@ -356,7 +401,7 @@ static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
                 goto out;
         }
 
-        status = ocfs2_journal_access_di(handle, inode, fe_bh,
+        status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
                                          OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
@@ -486,6 +531,8 @@ bail_unlock_sem:
         up_write(&OCFS2_I(inode)->ip_alloc_sem);
 
 bail:
+        if (!status && OCFS2_I(inode)->ip_clusters == 0)
+                status = ocfs2_try_remove_refcount_tree(inode, di_bh);
 
         mlog_exit(status);
         return status;
@@ -515,11 +562,10 @@ int ocfs2_add_inode_data(struct ocfs2_super *osb,
         int ret;
         struct ocfs2_extent_tree et;
 
-        ocfs2_init_dinode_extent_tree(&et, inode, fe_bh);
-        ret = ocfs2_add_clusters_in_btree(osb, inode, logical_offset,
-                                           clusters_to_add, mark_unwritten,
-                                           &et, handle,
-                                           data_ac, meta_ac, reason_ret);
+        ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), fe_bh);
+        ret = ocfs2_add_clusters_in_btree(handle, &et, logical_offset,
+                                          clusters_to_add, mark_unwritten,
+                                          data_ac, meta_ac, reason_ret);
 
         return ret;
 }
@@ -564,7 +610,7 @@ restart_all:
              (unsigned long long)OCFS2_I(inode)->ip_blkno,
              (long long)i_size_read(inode), le32_to_cpu(fe->i_clusters),
              clusters_to_add);
-        ocfs2_init_dinode_extent_tree(&et, inode, bh);
+        ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), bh);
         status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
                                        &data_ac, &meta_ac);
         if (status) {
@@ -593,7 +639,7 @@ restarted_transaction:
         /* reserve a write to the file entry early on - that we if we
          * run out of credits in the allocation path, we can still
          * update i_size. */
-        status = ocfs2_journal_access_di(handle, inode, bh,
+        status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
                                          OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
@@ -1131,7 +1177,7 @@ static int __ocfs2_write_remove_suid(struct inode *inode,
                 goto out;
         }
 
-        ret = ocfs2_journal_access_di(handle, inode, bh,
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret < 0) {
                 mlog_errno(ret);
@@ -1395,7 +1441,7 @@ static int ocfs2_remove_inode_range(struct inode *inode,
         struct address_space *mapping = inode->i_mapping;
         struct ocfs2_extent_tree et;
 
-        ocfs2_init_dinode_extent_tree(&et, inode, di_bh);
+        ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
         ocfs2_init_dealloc_ctxt(&dealloc);
 
         if (byte_len == 0)
@@ -1657,6 +1703,70 @@ static long ocfs2_fallocate(struct inode *inode, int mode, loff_t offset,
                                          OCFS2_IOC_RESVSP64, &sr, change_size);
 }
 
+int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
+                                   size_t count)
+{
+        int ret = 0;
+        unsigned int extent_flags;
+        u32 cpos, clusters, extent_len, phys_cpos;
+        struct super_block *sb = inode->i_sb;
+
+        if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) ||
+            !(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL))
+                return 0;
+
+        cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
+        clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
+
+        while (clusters) {
+                ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
+                                         &extent_flags);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) {
+                        ret = 1;
+                        break;
+                }
+
+                if (extent_len > clusters)
+                        extent_len = clusters;
+
+                clusters -= extent_len;
+                cpos += extent_len;
+        }
+out:
+        return ret;
+}
+
+static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
+                                            loff_t pos, size_t count,
+                                            int *meta_level)
+{
+        int ret;
+        struct buffer_head *di_bh = NULL;
+        u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
+        u32 clusters =
+                ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
+
+        ret = ocfs2_inode_lock(inode, &di_bh, 1);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        *meta_level = 1;
+
+        ret = ocfs2_refcount_cow(inode, di_bh, cpos, clusters, UINT_MAX);
+        if (ret)
+                mlog_errno(ret);
+out:
+        brelse(di_bh);
+        return ret;
+}
+
 static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
                                          loff_t *ppos,
                                          size_t count,
@@ -1713,6 +1823,22 @@ static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
 
                 end = saved_pos + count;
 
+                ret = ocfs2_check_range_for_refcount(inode, saved_pos, count);
+                if (ret == 1) {
+                        ocfs2_inode_unlock(inode, meta_level);
+                        meta_level = -1;
+
+                        ret = ocfs2_prepare_inode_for_refcount(inode,
+                                                               saved_pos,
+                                                               count,
+                                                               &meta_level);
+                }
+
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        goto out_unlock;
+                }
+
                 /*
                  * Skip the O_DIRECT checks if we don't need
                  * them.
@@ -1759,7 +1885,8 @@ static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
                 *ppos = saved_pos;
 
 out_unlock:
-        ocfs2_inode_unlock(inode, meta_level);
+        if (meta_level >= 0)
+                ocfs2_inode_unlock(inode, meta_level);
 
 out:
         return ret;
diff --git a/fs/ocfs2/file.h b/fs/ocfs2/file.h
index 172f9fbc9fc7..d66cf4f7c70e 100644
--- a/fs/ocfs2/file.h
+++ b/fs/ocfs2/file.h
@@ -69,4 +69,6 @@ int ocfs2_update_inode_atime(struct inode *inode,
 int ocfs2_change_file_space(struct file *file, unsigned int cmd,
                             struct ocfs2_space_resv *sr);
 
+int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
+                                   size_t count);
 #endif /* OCFS2_FILE_H */
diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 4dc8890ba316..0297fb8982b8 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -53,6 +53,7 @@
 #include "sysfile.h"
 #include "uptodate.h"
 #include "xattr.h"
+#include "refcounttree.h"
 
 #include "buffer_head_io.h"
 
@@ -562,7 +563,8 @@ static int ocfs2_truncate_for_delete(struct ocfs2_super *osb,
                         goto out;
                 }
 
-                status = ocfs2_journal_access_di(handle, inode, fe_bh,
+                status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
+                                                 fe_bh,
                                                  OCFS2_JOURNAL_ACCESS_WRITE);
                 if (status < 0) {
                         mlog_errno(status);
@@ -646,7 +648,7 @@ static int ocfs2_remove_inode(struct inode *inode,
         }
 
         /* set the inodes dtime */
-        status = ocfs2_journal_access_di(handle, inode, di_bh,
+        status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
                                          OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
@@ -662,7 +664,7 @@ static int ocfs2_remove_inode(struct inode *inode,
                 goto bail_commit;
         }
 
-        ocfs2_remove_from_cache(inode, di_bh);
+        ocfs2_remove_from_cache(INODE_CACHE(inode), di_bh);
         vfs_dq_free_inode(inode);
 
         status = ocfs2_free_dinode(handle, inode_alloc_inode,
@@ -781,6 +783,12 @@ static int ocfs2_wipe_inode(struct inode *inode,
                 goto bail_unlock_dir;
         }
 
+        status = ocfs2_remove_refcount_tree(inode, di_bh);
+        if (status < 0) {
+                mlog_errno(status);
+                goto bail_unlock_dir;
+        }
+
         status = ocfs2_remove_inode(inode, di_bh, orphan_dir_inode,
                                     orphan_dir_bh);
         if (status < 0)
@@ -1112,13 +1120,14 @@ void ocfs2_clear_inode(struct inode *inode)
         ocfs2_lock_res_free(&oi->ip_inode_lockres);
         ocfs2_lock_res_free(&oi->ip_open_lockres);
 
-        ocfs2_metadata_cache_purge(inode);
+        ocfs2_metadata_cache_exit(INODE_CACHE(inode));
 
-        mlog_bug_on_msg(oi->ip_metadata_cache.ci_num_cached,
+        mlog_bug_on_msg(INODE_CACHE(inode)->ci_num_cached,
                         "Clear inode of %llu, inode has %u cache items\n",
-                        (unsigned long long)oi->ip_blkno, oi->ip_metadata_cache.ci_num_cached);
+                        (unsigned long long)oi->ip_blkno,
+                        INODE_CACHE(inode)->ci_num_cached);
 
-        mlog_bug_on_msg(!(oi->ip_flags & OCFS2_INODE_CACHE_INLINE),
+        mlog_bug_on_msg(!(INODE_CACHE(inode)->ci_flags & OCFS2_CACHE_FL_INLINE),
                         "Clear inode of %llu, inode has a bad flag\n",
                         (unsigned long long)oi->ip_blkno);
 
@@ -1145,9 +1154,7 @@ void ocfs2_clear_inode(struct inode *inode)
                         (unsigned long long)oi->ip_blkno, oi->ip_open_count);
 
         /* Clear all other flags. */
-        oi->ip_flags = OCFS2_INODE_CACHE_INLINE;
-        oi->ip_created_trans = 0;
-        oi->ip_last_trans = 0;
+        oi->ip_flags = 0;
         oi->ip_dir_start_lookup = 0;
         oi->ip_blkno = 0ULL;
 
@@ -1239,7 +1246,7 @@ int ocfs2_mark_inode_dirty(handle_t *handle,
         mlog_entry("(inode %llu)\n",
                    (unsigned long long)OCFS2_I(inode)->ip_blkno);
 
-        status = ocfs2_journal_access_di(handle, inode, bh,
+        status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
                                          OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
@@ -1380,8 +1387,8 @@ int ocfs2_read_inode_block_full(struct inode *inode, struct buffer_head **bh,
         int rc;
         struct buffer_head *tmp = *bh;
 
-        rc = ocfs2_read_blocks(inode, OCFS2_I(inode)->ip_blkno, 1, &tmp,
-                               flags, ocfs2_validate_inode_block);
+        rc = ocfs2_read_blocks(INODE_CACHE(inode), OCFS2_I(inode)->ip_blkno,
+                               1, &tmp, flags, ocfs2_validate_inode_block);
 
         /* If ocfs2_read_blocks() got us a new bh, pass it up. */
         if (!rc && !*bh)
@@ -1394,3 +1401,56 @@ int ocfs2_read_inode_block(struct inode *inode, struct buffer_head **bh)
 {
         return ocfs2_read_inode_block_full(inode, bh, 0);
 }
+
+
+static u64 ocfs2_inode_cache_owner(struct ocfs2_caching_info *ci)
+{
+        struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
+
+        return oi->ip_blkno;
+}
+
+static struct super_block *ocfs2_inode_cache_get_super(struct ocfs2_caching_info *ci)
+{
+        struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
+
+        return oi->vfs_inode.i_sb;
+}
+
+static void ocfs2_inode_cache_lock(struct ocfs2_caching_info *ci)
+{
+        struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
+
+        spin_lock(&oi->ip_lock);
+}
+
+static void ocfs2_inode_cache_unlock(struct ocfs2_caching_info *ci)
+{
+        struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
+
+        spin_unlock(&oi->ip_lock);
+}
+
+static void ocfs2_inode_cache_io_lock(struct ocfs2_caching_info *ci)
+{
+        struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
+
+        mutex_lock(&oi->ip_io_mutex);
+}
+
+static void ocfs2_inode_cache_io_unlock(struct ocfs2_caching_info *ci)
+{
+        struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
+
+        mutex_unlock(&oi->ip_io_mutex);
+}
+
+const struct ocfs2_caching_operations ocfs2_inode_caching_ops = {
+        .co_owner               = ocfs2_inode_cache_owner,
+        .co_get_super           = ocfs2_inode_cache_get_super,
+        .co_cache_lock          = ocfs2_inode_cache_lock,
+        .co_cache_unlock        = ocfs2_inode_cache_unlock,
+        .co_io_lock             = ocfs2_inode_cache_io_lock,
+        .co_io_unlock           = ocfs2_inode_cache_io_unlock,
+};
+
diff --git a/fs/ocfs2/inode.h b/fs/ocfs2/inode.h
index ea71525aad41..ba4fe07b293c 100644
--- a/fs/ocfs2/inode.h
+++ b/fs/ocfs2/inode.h
@@ -60,12 +60,6 @@ struct ocfs2_inode_info
 
         u32                             ip_dir_start_lookup;
 
-        /* next two are protected by trans_inc_lock */
-        /* which transaction were we created on? Zero if none. */
-        unsigned long                   ip_created_trans;
-        /* last transaction we were a part of. */
-        unsigned long                   ip_last_trans;
-
         struct ocfs2_caching_info       ip_metadata_cache;
 
         struct ocfs2_extent_map         ip_extent_map;
@@ -106,8 +100,6 @@ struct ocfs2_inode_info
 #define OCFS2_INODE_MAYBE_ORPHANED      0x00000020
 /* Does someone have the file open O_DIRECT */
 #define OCFS2_INODE_OPEN_DIRECT         0x00000040
-/* Indicates that the metadata cache should be used as an array. */
-#define OCFS2_INODE_CACHE_INLINE        0x00000080
 
 static inline struct ocfs2_inode_info *OCFS2_I(struct inode *inode)
 {
@@ -120,6 +112,12 @@ static inline struct ocfs2_inode_info *OCFS2_I(struct inode *inode)
 extern struct kmem_cache *ocfs2_inode_cache;
 
 extern const struct address_space_operations ocfs2_aops;
+extern const struct ocfs2_caching_operations ocfs2_inode_caching_ops;
+
+static inline struct ocfs2_caching_info *INODE_CACHE(struct inode *inode)
+{
+        return &OCFS2_I(inode)->ip_metadata_cache;
+}
 
 void ocfs2_clear_inode(struct inode *inode);
 void ocfs2_delete_inode(struct inode *inode);
@@ -172,4 +170,10 @@ int ocfs2_read_inode_block(struct inode *inode, struct buffer_head **bh);
 /* The same, but can be passed OCFS2_BH_* flags */
 int ocfs2_read_inode_block_full(struct inode *inode, struct buffer_head **bh,
                                 int flags);
+
+static inline struct ocfs2_inode_info *cache_info_to_inode(struct ocfs2_caching_info *ci)
+{
+        return container_of(ci, struct ocfs2_inode_info, ip_metadata_cache);
+}
+
 #endif /* OCFS2_INODE_H */
diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
index 467b413bec21..31fbb0619510 100644
--- a/fs/ocfs2/ioctl.c
+++ b/fs/ocfs2/ioctl.c
@@ -21,6 +21,7 @@
 #include "ocfs2_fs.h"
 #include "ioctl.h"
 #include "resize.h"
+#include "refcounttree.h"
 
 #include <linux/ext2_fs.h>
 
@@ -115,6 +116,9 @@ long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
         int status;
         struct ocfs2_space_resv sr;
         struct ocfs2_new_group_input input;
+        struct reflink_arguments args;
+        const char *old_path, *new_path;
+        bool preserve;
 
         switch (cmd) {
         case OCFS2_IOC_GETFLAGS:
@@ -160,6 +164,15 @@ long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
                         return -EFAULT;
 
                 return ocfs2_group_add(inode, &input);
+        case OCFS2_IOC_REFLINK:
+                if (copy_from_user(&args, (struct reflink_arguments *)arg,
+                                   sizeof(args)))
+                        return -EFAULT;
+                old_path = (const char *)(unsigned long)args.old_path;
+                new_path = (const char *)(unsigned long)args.new_path;
+                preserve = (args.preserve != 0);
+
+                return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
         default:
                 return -ENOTTY;
         }
@@ -182,6 +195,7 @@ long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
         case OCFS2_IOC_GROUP_EXTEND:
         case OCFS2_IOC_GROUP_ADD:
         case OCFS2_IOC_GROUP_ADD64:
+        case OCFS2_IOC_REFLINK:
                 break;
         default:
                 return -ENOIOCTLCMD;
diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index c48b93ac6b65..54c16b66327e 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -48,6 +48,7 @@
 #include "slot_map.h"
 #include "super.h"
 #include "sysfile.h"
+#include "uptodate.h"
 #include "quota.h"
 
 #include "buffer_head_io.h"
@@ -554,6 +555,14 @@ static struct ocfs2_triggers eb_triggers = {
         .ot_offset      = offsetof(struct ocfs2_extent_block, h_check),
 };
 
+static struct ocfs2_triggers rb_triggers = {
+        .ot_triggers = {
+                .t_commit = ocfs2_commit_trigger,
+                .t_abort = ocfs2_abort_trigger,
+        },
+        .ot_offset      = offsetof(struct ocfs2_refcount_block, rf_check),
+};
+
 static struct ocfs2_triggers gd_triggers = {
         .ot_triggers = {
                 .t_commit = ocfs2_commit_trigger,
@@ -601,14 +610,16 @@ static struct ocfs2_triggers dl_triggers = {
 };
 
 static int __ocfs2_journal_access(handle_t *handle,
-                                  struct inode *inode,
+                                  struct ocfs2_caching_info *ci,
                                   struct buffer_head *bh,
                                   struct ocfs2_triggers *triggers,
                                   int type)
 {
         int status;
+        struct ocfs2_super *osb =
+                OCFS2_SB(ocfs2_metadata_cache_get_super(ci));
 
-        BUG_ON(!inode);
+        BUG_ON(!ci || !ci->ci_ops);
         BUG_ON(!handle);
         BUG_ON(!bh);
 
@@ -627,15 +638,15 @@ static int __ocfs2_journal_access(handle_t *handle,
                 BUG();
         }
 
-        /* Set the current transaction information on the inode so
+        /* Set the current transaction information on the ci so
          * that the locking code knows whether it can drop it's locks
-         * on this inode or not. We're protected from the commit
+         * on this ci or not. We're protected from the commit
          * thread updating the current transaction id until
          * ocfs2_commit_trans() because ocfs2_start_trans() took
          * j_trans_barrier for us. */
-        ocfs2_set_inode_lock_trans(OCFS2_SB(inode->i_sb)->journal, inode);
+        ocfs2_set_ci_lock_trans(osb->journal, ci);
 
-        mutex_lock(&OCFS2_I(inode)->ip_io_mutex);
+        ocfs2_metadata_cache_io_lock(ci);
         switch (type) {
         case OCFS2_JOURNAL_ACCESS_CREATE:
         case OCFS2_JOURNAL_ACCESS_WRITE:
@@ -650,9 +661,9 @@ static int __ocfs2_journal_access(handle_t *handle,
                 status = -EINVAL;
                 mlog(ML_ERROR, "Uknown access type!\n");
         }
-        if (!status && ocfs2_meta_ecc(OCFS2_SB(inode->i_sb)) && triggers)
+        if (!status && ocfs2_meta_ecc(osb) && triggers)
                 jbd2_journal_set_triggers(bh, &triggers->ot_triggers);
-        mutex_unlock(&OCFS2_I(inode)->ip_io_mutex);
+        ocfs2_metadata_cache_io_unlock(ci);
 
         if (status < 0)
                 mlog(ML_ERROR, "Error %d getting %d access to buffer!\n",
@@ -662,66 +673,65 @@ static int __ocfs2_journal_access(handle_t *handle,
         return status;
 }
 
-int ocfs2_journal_access_di(handle_t *handle, struct inode *inode,
-                               struct buffer_head *bh, int type)
+int ocfs2_journal_access_di(handle_t *handle, struct ocfs2_caching_info *ci,
+                            struct buffer_head *bh, int type)
 {
-        return __ocfs2_journal_access(handle, inode, bh, &di_triggers,
-                                      type);
+        return __ocfs2_journal_access(handle, ci, bh, &di_triggers, type);
 }
 
-int ocfs2_journal_access_eb(handle_t *handle, struct inode *inode,
+int ocfs2_journal_access_eb(handle_t *handle, struct ocfs2_caching_info *ci,
                             struct buffer_head *bh, int type)
 {
-        return __ocfs2_journal_access(handle, inode, bh, &eb_triggers,
-                                      type);
+        return __ocfs2_journal_access(handle, ci, bh, &eb_triggers, type);
 }
 
-int ocfs2_journal_access_gd(handle_t *handle, struct inode *inode,
+int ocfs2_journal_access_rb(handle_t *handle, struct ocfs2_caching_info *ci,
                             struct buffer_head *bh, int type)
 {
-        return __ocfs2_journal_access(handle, inode, bh, &gd_triggers,
+        return __ocfs2_journal_access(handle, ci, bh, &rb_triggers,
                                       type);
 }
 
-int ocfs2_journal_access_db(handle_t *handle, struct inode *inode,
+int ocfs2_journal_access_gd(handle_t *handle, struct ocfs2_caching_info *ci,
                             struct buffer_head *bh, int type)
 {
-        return __ocfs2_journal_access(handle, inode, bh, &db_triggers,
-                                      type);
+        return __ocfs2_journal_access(handle, ci, bh, &gd_triggers, type);
 }
 
-int ocfs2_journal_access_xb(handle_t *handle, struct inode *inode,
+int ocfs2_journal_access_db(handle_t *handle, struct ocfs2_caching_info *ci,
                             struct buffer_head *bh, int type)
 {
-        return __ocfs2_journal_access(handle, inode, bh, &xb_triggers,
-                                      type);
+        return __ocfs2_journal_access(handle, ci, bh, &db_triggers, type);
 }
 
-int ocfs2_journal_access_dq(handle_t *handle, struct inode *inode,
+int ocfs2_journal_access_xb(handle_t *handle, struct ocfs2_caching_info *ci,
                             struct buffer_head *bh, int type)
 {
-        return __ocfs2_journal_access(handle, inode, bh, &dq_triggers,
-                                      type);
+        return __ocfs2_journal_access(handle, ci, bh, &xb_triggers, type);
 }
 
-int ocfs2_journal_access_dr(handle_t *handle, struct inode *inode,
+int ocfs2_journal_access_dq(handle_t *handle, struct ocfs2_caching_info *ci,
                             struct buffer_head *bh, int type)
 {
-        return __ocfs2_journal_access(handle, inode, bh, &dr_triggers,
-                                      type);
+        return __ocfs2_journal_access(handle, ci, bh, &dq_triggers, type);
 }
 
-int ocfs2_journal_access_dl(handle_t *handle, struct inode *inode,
+int ocfs2_journal_access_dr(handle_t *handle, struct ocfs2_caching_info *ci,
                             struct buffer_head *bh, int type)
 {
-        return __ocfs2_journal_access(handle, inode, bh, &dl_triggers,
-                                      type);
+        return __ocfs2_journal_access(handle, ci, bh, &dr_triggers, type);
+}
+
+int ocfs2_journal_access_dl(handle_t *handle, struct ocfs2_caching_info *ci,
+                            struct buffer_head *bh, int type)
+{
+        return __ocfs2_journal_access(handle, ci, bh, &dl_triggers, type);
 }
 
-int ocfs2_journal_access(handle_t *handle, struct inode *inode,
+int ocfs2_journal_access(handle_t *handle, struct ocfs2_caching_info *ci,
                          struct buffer_head *bh, int type)
 {
-        return __ocfs2_journal_access(handle, inode, bh, NULL, type);
+        return __ocfs2_journal_access(handle, ci, bh, NULL, type);
 }
 
 int ocfs2_journal_dirty(handle_t *handle,
@@ -898,7 +908,7 @@ static int ocfs2_journal_toggle_dirty(struct ocfs2_super *osb,
                 ocfs2_bump_recovery_generation(fe);
 
         ocfs2_compute_meta_ecc(osb->sb, bh->b_data, &fe->i_check);
-        status = ocfs2_write_block(osb, bh, journal->j_inode);
+        status = ocfs2_write_block(osb, bh, INODE_CACHE(journal->j_inode));
         if (status < 0)
                 mlog_errno(status);
 
@@ -1642,7 +1652,7 @@ static int ocfs2_replay_journal(struct ocfs2_super *osb,
                                         ocfs2_get_recovery_generation(fe);
 
         ocfs2_compute_meta_ecc(osb->sb, bh->b_data, &fe->i_check);
-        status = ocfs2_write_block(osb, bh, inode);
+        status = ocfs2_write_block(osb, bh, INODE_CACHE(inode));
         if (status < 0)
                 mlog_errno(status);
 
diff --git a/fs/ocfs2/journal.h b/fs/ocfs2/journal.h
index 2c3222aec622..3f74e09b0d80 100644
--- a/fs/ocfs2/journal.h
+++ b/fs/ocfs2/journal.h
@@ -90,56 +90,66 @@ static inline unsigned long ocfs2_inc_trans_id(struct ocfs2_journal *j)
         return old_id;
 }
 
-static inline void ocfs2_set_inode_lock_trans(struct ocfs2_journal *journal,
-                                              struct inode *inode)
+static inline void ocfs2_set_ci_lock_trans(struct ocfs2_journal *journal,
+                                           struct ocfs2_caching_info *ci)
 {
         spin_lock(&trans_inc_lock);
-        OCFS2_I(inode)->ip_last_trans = journal->j_trans_id;
+        ci->ci_last_trans = journal->j_trans_id;
         spin_unlock(&trans_inc_lock);
 }
 
 /* Used to figure out whether it's safe to drop a metadata lock on an
- * inode. Returns true if all the inodes changes have been
+ * cached object. Returns true if all the object's changes have been
  * checkpointed to disk. You should be holding the spinlock on the
  * metadata lock while calling this to be sure that nobody can take
  * the lock and put it on another transaction. */
-static inline int ocfs2_inode_fully_checkpointed(struct inode *inode)
+static inline int ocfs2_ci_fully_checkpointed(struct ocfs2_caching_info *ci)
 {
         int ret;
-        struct ocfs2_journal *journal = OCFS2_SB(inode->i_sb)->journal;
+        struct ocfs2_journal *journal =
+                OCFS2_SB(ocfs2_metadata_cache_get_super(ci))->journal;
 
         spin_lock(&trans_inc_lock);
-        ret = time_after(journal->j_trans_id, OCFS2_I(inode)->ip_last_trans);
+        ret = time_after(journal->j_trans_id, ci->ci_last_trans);
         spin_unlock(&trans_inc_lock);
         return ret;
 }
 
-/* convenience function to check if an inode is still new (has never
- * hit disk) Will do you a favor and set created_trans = 0 when you've
- * been checkpointed.  returns '1' if the inode is still new. */
-static inline int ocfs2_inode_is_new(struct inode *inode)
+/* convenience function to check if an object backed by struct
+ * ocfs2_caching_info  is still new (has never hit disk) Will do you a
+ * favor and set created_trans = 0 when you've
+ * been checkpointed.  returns '1' if the ci is still new. */
+static inline int ocfs2_ci_is_new(struct ocfs2_caching_info *ci)
 {
         int ret;
+        struct ocfs2_journal *journal =
+                OCFS2_SB(ocfs2_metadata_cache_get_super(ci))->journal;
 
+        spin_lock(&trans_inc_lock);
+        ret = !(time_after(journal->j_trans_id, ci->ci_created_trans));
+        if (!ret)
+                ci->ci_created_trans = 0;
+        spin_unlock(&trans_inc_lock);
+        return ret;
+}
+
+/* Wrapper for inodes so we can check system files */
+static inline int ocfs2_inode_is_new(struct inode *inode)
+{
         /* System files are never "new" as they're written out by
          * mkfs. This helps us early during mount, before we have the
          * journal open and j_trans_id could be junk. */
         if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE)
                 return 0;
-        spin_lock(&trans_inc_lock);
-        ret = !(time_after(OCFS2_SB(inode->i_sb)->journal->j_trans_id,
-                           OCFS2_I(inode)->ip_created_trans));
-        if (!ret)
-                OCFS2_I(inode)->ip_created_trans = 0;
-        spin_unlock(&trans_inc_lock);
-        return ret;
+
+        return ocfs2_ci_is_new(INODE_CACHE(inode));
 }
 
-static inline void ocfs2_inode_set_new(struct ocfs2_super *osb,
-                                       struct inode *inode)
+static inline void ocfs2_ci_set_new(struct ocfs2_super *osb,
+                                    struct ocfs2_caching_info *ci)
 {
         spin_lock(&trans_inc_lock);
-        OCFS2_I(inode)->ip_created_trans = osb->journal->j_trans_id;
+        ci->ci_created_trans = osb->journal->j_trans_id;
         spin_unlock(&trans_inc_lock);
 }
 
@@ -200,7 +210,7 @@ static inline void ocfs2_checkpoint_inode(struct inode *inode)
         if (ocfs2_mount_local(osb))
                 return;
 
-        if (!ocfs2_inode_fully_checkpointed(inode)) {
+        if (!ocfs2_ci_fully_checkpointed(INODE_CACHE(inode))) {
                 /* WARNING: This only kicks off a single
                  * checkpoint. If someone races you and adds more
                  * metadata to the journal, you won't know, and will
@@ -210,7 +220,7 @@ static inline void ocfs2_checkpoint_inode(struct inode *inode)
                 ocfs2_start_checkpoint(osb);
 
                 wait_event(osb->journal->j_checkpointed,
-                           ocfs2_inode_fully_checkpointed(inode));
+                           ocfs2_ci_fully_checkpointed(INODE_CACHE(inode)));
         }
 }
 
@@ -266,31 +276,34 @@ int			     ocfs2_extend_trans(handle_t *handle, int nblocks);
 
 
 /* ocfs2_inode */
-int ocfs2_journal_access_di(handle_t *handle, struct inode *inode,
+int ocfs2_journal_access_di(handle_t *handle, struct ocfs2_caching_info *ci,
                             struct buffer_head *bh, int type);
 /* ocfs2_extent_block */
-int ocfs2_journal_access_eb(handle_t *handle, struct inode *inode,
+int ocfs2_journal_access_eb(handle_t *handle, struct ocfs2_caching_info *ci,
+                            struct buffer_head *bh, int type);
+/* ocfs2_refcount_block */
+int ocfs2_journal_access_rb(handle_t *handle, struct ocfs2_caching_info *ci,
                             struct buffer_head *bh, int type);
 /* ocfs2_group_desc */
-int ocfs2_journal_access_gd(handle_t *handle, struct inode *inode,
+int ocfs2_journal_access_gd(handle_t *handle, struct ocfs2_caching_info *ci,
                             struct buffer_head *bh, int type);
 /* ocfs2_xattr_block */
-int ocfs2_journal_access_xb(handle_t *handle, struct inode *inode,
+int ocfs2_journal_access_xb(handle_t *handle, struct ocfs2_caching_info *ci,
                             struct buffer_head *bh, int type);
 /* quota blocks */
-int ocfs2_journal_access_dq(handle_t *handle, struct inode *inode,
+int ocfs2_journal_access_dq(handle_t *handle, struct ocfs2_caching_info *ci,
                             struct buffer_head *bh, int type);
 /* dirblock */
-int ocfs2_journal_access_db(handle_t *handle, struct inode *inode,
+int ocfs2_journal_access_db(handle_t *handle, struct ocfs2_caching_info *ci,
                             struct buffer_head *bh, int type);
 /* ocfs2_dx_root_block */
-int ocfs2_journal_access_dr(handle_t *handle, struct inode *inode,
+int ocfs2_journal_access_dr(handle_t *handle, struct ocfs2_caching_info *ci,
                             struct buffer_head *bh, int type);
 /* ocfs2_dx_leaf */
-int ocfs2_journal_access_dl(handle_t *handle, struct inode *inode,
+int ocfs2_journal_access_dl(handle_t *handle, struct ocfs2_caching_info *ci,
                             struct buffer_head *bh, int type);
 /* Anything that has no ecc */
-int ocfs2_journal_access(handle_t *handle, struct inode *inode,
+int ocfs2_journal_access(handle_t *handle, struct ocfs2_caching_info *ci,
                          struct buffer_head *bh, int type);
 
 /*
@@ -477,6 +490,23 @@ static inline int ocfs2_calc_dxi_expand_credits(struct super_block *sb)
         return credits;
 }
 
+/* inode update, new refcount block and its allocation credits. */
+#define OCFS2_REFCOUNT_TREE_CREATE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1 \
+                                            + OCFS2_SUBALLOC_ALLOC)
+
+/* inode and the refcount block update. */
+#define OCFS2_REFCOUNT_TREE_SET_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1)
+
+/*
+ * inode and the refcount block update.
+ * It doesn't include the credits for sub alloc change.
+ * So if we need to free the bit, OCFS2_SUBALLOC_FREE needs to be added.
+ */
+#define OCFS2_REFCOUNT_TREE_REMOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1)
+
+/* 2 metadata alloc, 2 new blocks and root refcount block */
+#define OCFS2_EXPAND_REFCOUNT_TREE_CREDITS (OCFS2_SUBALLOC_ALLOC * 2 + 3)
+
 /*
  * Please note that the caller must make sure that root_el is the root
  * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise
diff --git a/fs/ocfs2/localalloc.c b/fs/ocfs2/localalloc.c
index bac7e6abaf47..ac10f83edb95 100644
--- a/fs/ocfs2/localalloc.c
+++ b/fs/ocfs2/localalloc.c
@@ -297,8 +297,8 @@ void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb)
         }
         memcpy(alloc_copy, alloc, bh->b_size);
 
-        status = ocfs2_journal_access_di(handle, local_alloc_inode, bh,
-                                         OCFS2_JOURNAL_ACCESS_WRITE);
+        status = ocfs2_journal_access_di(handle, INODE_CACHE(local_alloc_inode),
+                                         bh, OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
                 goto out_commit;
@@ -392,7 +392,7 @@ int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
         ocfs2_clear_local_alloc(alloc);
 
         ocfs2_compute_meta_ecc(osb->sb, alloc_bh->b_data, &alloc->i_check);
-        status = ocfs2_write_block(osb, alloc_bh, inode);
+        status = ocfs2_write_block(osb, alloc_bh, INODE_CACHE(inode));
         if (status < 0)
                 mlog_errno(status);
 
@@ -678,7 +678,8 @@ int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
          * delete bits from it! */
         *num_bits = bits_wanted;
 
-        status = ocfs2_journal_access_di(handle, local_alloc_inode,
+        status = ocfs2_journal_access_di(handle,
+                                         INODE_CACHE(local_alloc_inode),
                                          osb->local_alloc_bh,
                                          OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
@@ -1156,7 +1157,8 @@ static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
         }
         memcpy(alloc_copy, alloc, osb->local_alloc_bh->b_size);
 
-        status = ocfs2_journal_access_di(handle, local_alloc_inode,
+        status = ocfs2_journal_access_di(handle,
+                                         INODE_CACHE(local_alloc_inode),
                                          osb->local_alloc_bh,
                                          OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
diff --git a/fs/ocfs2/mmap.c b/fs/ocfs2/mmap.c
index b606496b72ec..39737613424a 100644
--- a/fs/ocfs2/mmap.c
+++ b/fs/ocfs2/mmap.c
@@ -202,7 +202,7 @@ out:
         return ret;
 }
 
-static struct vm_operations_struct ocfs2_file_vm_ops = {
+static const struct vm_operations_struct ocfs2_file_vm_ops = {
         .fault          = ocfs2_fault,
         .page_mkwrite   = ocfs2_page_mkwrite,
 };
diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index 8601f934010b..f010b22b1c44 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -69,7 +69,6 @@
 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
                               struct inode *dir,
                               struct inode *inode,
-                              struct dentry *dentry,
                               dev_t dev,
                               struct buffer_head **new_fe_bh,
                               struct buffer_head *parent_fe_bh,
@@ -78,7 +77,7 @@ static int ocfs2_mknod_locked(struct ocfs2_super *osb,
 
 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
                                     struct inode **ret_orphan_dir,
-                                    struct inode *inode,
+                                    u64 blkno,
                                     char *name,
                                     struct ocfs2_dir_lookup_result *lookup);
 
@@ -358,8 +357,12 @@ static int ocfs2_mknod(struct inode *dir,
         }
         did_quota_inode = 1;
 
+        mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry,
+                   inode->i_mode, (unsigned long)dev, dentry->d_name.len,
+                   dentry->d_name.name);
+
         /* do the real work now. */
-        status = ocfs2_mknod_locked(osb, dir, inode, dentry, dev,
+        status = ocfs2_mknod_locked(osb, dir, inode, dev,
                                     &new_fe_bh, parent_fe_bh, handle,
                                     inode_ac);
         if (status < 0) {
@@ -375,7 +378,8 @@ static int ocfs2_mknod(struct inode *dir,
                         goto leave;
                 }
 
-                status = ocfs2_journal_access_di(handle, dir, parent_fe_bh,
+                status = ocfs2_journal_access_di(handle, INODE_CACHE(dir),
+                                                 parent_fe_bh,
                                                  OCFS2_JOURNAL_ACCESS_WRITE);
                 if (status < 0) {
                         mlog_errno(status);
@@ -465,7 +469,6 @@ leave:
 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
                               struct inode *dir,
                               struct inode *inode,
-                              struct dentry *dentry,
                               dev_t dev,
                               struct buffer_head **new_fe_bh,
                               struct buffer_head *parent_fe_bh,
@@ -479,10 +482,6 @@ static int ocfs2_mknod_locked(struct ocfs2_super *osb,
         u16 suballoc_bit;
         u16 feat;
 
-        mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry,
-                   inode->i_mode, (unsigned long)dev, dentry->d_name.len,
-                   dentry->d_name.name);
-
         *new_fe_bh = NULL;
 
         status = ocfs2_claim_new_inode(osb, handle, dir, parent_fe_bh,
@@ -507,9 +506,10 @@ static int ocfs2_mknod_locked(struct ocfs2_super *osb,
                 mlog_errno(status);
                 goto leave;
         }
-        ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh);
+        ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), *new_fe_bh);
 
-        status = ocfs2_journal_access_di(handle, inode, *new_fe_bh,
+        status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
+                                         *new_fe_bh,
                                          OCFS2_JOURNAL_ACCESS_CREATE);
         if (status < 0) {
                 mlog_errno(status);
@@ -565,7 +565,7 @@ static int ocfs2_mknod_locked(struct ocfs2_super *osb,
         }
 
         ocfs2_populate_inode(inode, fe, 1);
-        ocfs2_inode_set_new(osb, inode);
+        ocfs2_ci_set_new(osb, INODE_CACHE(inode));
         if (!ocfs2_mount_local(osb)) {
                 status = ocfs2_create_new_inode_locks(inode);
                 if (status < 0)
@@ -682,7 +682,7 @@ static int ocfs2_link(struct dentry *old_dentry,
                 goto out_unlock_inode;
         }
 
-        err = ocfs2_journal_access_di(handle, inode, fe_bh,
+        err = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (err < 0) {
                 mlog_errno(err);
@@ -850,7 +850,8 @@ static int ocfs2_unlink(struct inode *dir,
         }
 
         if (inode_is_unlinkable(inode)) {
-                status = ocfs2_prepare_orphan_dir(osb, &orphan_dir, inode,
+                status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
+                                                  OCFS2_I(inode)->ip_blkno,
                                                   orphan_name, &orphan_insert);
                 if (status < 0) {
                         mlog_errno(status);
@@ -866,7 +867,7 @@ static int ocfs2_unlink(struct inode *dir,
                 goto leave;
         }
 
-        status = ocfs2_journal_access_di(handle, inode, fe_bh,
+        status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
                                          OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
@@ -1241,9 +1242,8 @@ static int ocfs2_rename(struct inode *old_dir,
 
                 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
                         status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
-                                                          new_inode,
-                                                          orphan_name,
-                                                          &orphan_insert);
+                                                OCFS2_I(new_inode)->ip_blkno,
+                                                orphan_name, &orphan_insert);
                         if (status < 0) {
                                 mlog_errno(status);
                                 goto bail;
@@ -1284,7 +1284,8 @@ static int ocfs2_rename(struct inode *old_dir,
                                 goto bail;
                         }
                 }
-                status = ocfs2_journal_access_di(handle, new_inode, newfe_bh,
+                status = ocfs2_journal_access_di(handle, INODE_CACHE(new_inode),
+                                                 newfe_bh,
                                                  OCFS2_JOURNAL_ACCESS_WRITE);
                 if (status < 0) {
                         mlog_errno(status);
@@ -1331,7 +1332,8 @@ static int ocfs2_rename(struct inode *old_dir,
         old_inode->i_ctime = CURRENT_TIME;
         mark_inode_dirty(old_inode);
 
-        status = ocfs2_journal_access_di(handle, old_inode, old_inode_bh,
+        status = ocfs2_journal_access_di(handle, INODE_CACHE(old_inode),
+                                         old_inode_bh,
                                          OCFS2_JOURNAL_ACCESS_WRITE);
         if (status >= 0) {
                 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
@@ -1407,9 +1409,10 @@ static int ocfs2_rename(struct inode *old_dir,
                              (int)old_dir_nlink, old_dir->i_nlink);
                 } else {
                         struct ocfs2_dinode *fe;
-                        status = ocfs2_journal_access_di(handle, old_dir,
-                                                      old_dir_bh,
-                                                      OCFS2_JOURNAL_ACCESS_WRITE);
+                        status = ocfs2_journal_access_di(handle,
+                                                         INODE_CACHE(old_dir),
+                                                         old_dir_bh,
+                                                         OCFS2_JOURNAL_ACCESS_WRITE);
                         fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
                         ocfs2_set_links_count(fe, old_dir->i_nlink);
                         status = ocfs2_journal_dirty(handle, old_dir_bh);
@@ -1527,9 +1530,11 @@ static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
                         mlog_errno(status);
                         goto bail;
                 }
-                ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);
+                ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode),
+                                              bhs[virtual]);
 
-                status = ocfs2_journal_access(handle, inode, bhs[virtual],
+                status = ocfs2_journal_access(handle, INODE_CACHE(inode),
+                                              bhs[virtual],
                                               OCFS2_JOURNAL_ACCESS_CREATE);
                 if (status < 0) {
                         mlog_errno(status);
@@ -1692,7 +1697,11 @@ static int ocfs2_symlink(struct inode *dir,
         }
         did_quota_inode = 1;
 
-        status = ocfs2_mknod_locked(osb, dir, inode, dentry,
+        mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry,
+                   inode->i_mode, dentry->d_name.len,
+                   dentry->d_name.name);
+
+        status = ocfs2_mknod_locked(osb, dir, inode,
                                     0, &new_fe_bh, parent_fe_bh, handle,
                                     inode_ac);
         if (status < 0) {
@@ -1842,7 +1851,7 @@ bail:
 
 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
                                     struct inode **ret_orphan_dir,
-                                    struct inode *inode,
+                                    u64 blkno,
                                     char *name,
                                     struct ocfs2_dir_lookup_result *lookup)
 {
@@ -1850,7 +1859,7 @@ static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
         struct buffer_head *orphan_dir_bh = NULL;
         int status = 0;
 
-        status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
+        status = ocfs2_blkno_stringify(blkno, name);
         if (status < 0) {
                 mlog_errno(status);
                 return status;
@@ -1917,7 +1926,9 @@ static int ocfs2_orphan_add(struct ocfs2_super *osb,
                 goto leave;
         }
 
-        status = ocfs2_journal_access_di(handle, orphan_dir_inode, orphan_dir_bh,
+        status = ocfs2_journal_access_di(handle,
+                                         INODE_CACHE(orphan_dir_inode),
+                                         orphan_dir_bh,
                                          OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
@@ -2002,7 +2013,9 @@ int ocfs2_orphan_del(struct ocfs2_super *osb,
                 goto leave;
         }
 
-        status = ocfs2_journal_access_di(handle,orphan_dir_inode,  orphan_dir_bh,
+        status = ocfs2_journal_access_di(handle,
+                                         INODE_CACHE(orphan_dir_inode),
+                                         orphan_dir_bh,
                                          OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
@@ -2028,6 +2041,274 @@ leave:
         return status;
 }
 
+int ocfs2_create_inode_in_orphan(struct inode *dir,
+                                 int mode,
+                                 struct inode **new_inode)
+{
+        int status, did_quota_inode = 0;
+        struct inode *inode = NULL;
+        struct inode *orphan_dir = NULL;
+        struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
+        struct ocfs2_dinode *di = NULL;
+        handle_t *handle = NULL;
+        char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
+        struct buffer_head *parent_di_bh = NULL;
+        struct buffer_head *new_di_bh = NULL;
+        struct ocfs2_alloc_context *inode_ac = NULL;
+        struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
+
+        status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
+        if (status < 0) {
+                if (status != -ENOENT)
+                        mlog_errno(status);
+                return status;
+        }
+
+        /*
+         * We give the orphan dir the root blkno to fake an orphan name,
+         * and allocate enough space for our insertion.
+         */
+        status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
+                                          osb->root_blkno,
+                                          orphan_name, &orphan_insert);
+        if (status < 0) {
+                mlog_errno(status);
+                goto leave;
+        }
+
+        /* reserve an inode spot */
+        status = ocfs2_reserve_new_inode(osb, &inode_ac);
+        if (status < 0) {
+                if (status != -ENOSPC)
+                        mlog_errno(status);
+                goto leave;
+        }
+
+        inode = ocfs2_get_init_inode(dir, mode);
+        if (!inode) {
+                status = -ENOMEM;
+                mlog_errno(status);
+                goto leave;
+        }
+
+        handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb, 0, 0));
+        if (IS_ERR(handle)) {
+                status = PTR_ERR(handle);
+                handle = NULL;
+                mlog_errno(status);
+                goto leave;
+        }
+
+        /* We don't use standard VFS wrapper because we don't want vfs_dq_init
+         * to be called. */
+        if (sb_any_quota_active(osb->sb) &&
+            osb->sb->dq_op->alloc_inode(inode, 1) == NO_QUOTA) {
+                status = -EDQUOT;
+                goto leave;
+        }
+        did_quota_inode = 1;
+
+        /* do the real work now. */
+        status = ocfs2_mknod_locked(osb, dir, inode,
+                                    0, &new_di_bh, parent_di_bh, handle,
+                                    inode_ac);
+        if (status < 0) {
+                mlog_errno(status);
+                goto leave;
+        }
+
+        status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, orphan_name);
+        if (status < 0) {
+                mlog_errno(status);
+                goto leave;
+        }
+
+        di = (struct ocfs2_dinode *)new_di_bh->b_data;
+        status = ocfs2_orphan_add(osb, handle, inode, di, orphan_name,
+                                  &orphan_insert, orphan_dir);
+        if (status < 0) {
+                mlog_errno(status);
+                goto leave;
+        }
+
+        /* get open lock so that only nodes can't remove it from orphan dir. */
+        status = ocfs2_open_lock(inode);
+        if (status < 0)
+                mlog_errno(status);
+
+leave:
+        if (status < 0 && did_quota_inode)
+                vfs_dq_free_inode(inode);
+        if (handle)
+                ocfs2_commit_trans(osb, handle);
+
+        if (orphan_dir) {
+                /* This was locked for us in ocfs2_prepare_orphan_dir() */
+                ocfs2_inode_unlock(orphan_dir, 1);
+                mutex_unlock(&orphan_dir->i_mutex);
+                iput(orphan_dir);
+        }
+
+        if (status == -ENOSPC)
+                mlog(0, "Disk is full\n");
+
+        if ((status < 0) && inode) {
+                clear_nlink(inode);
+                iput(inode);
+        }
+
+        if (inode_ac)
+                ocfs2_free_alloc_context(inode_ac);
+
+        brelse(new_di_bh);
+
+        if (!status)
+                *new_inode = inode;
+
+        ocfs2_free_dir_lookup_result(&orphan_insert);
+
+        ocfs2_inode_unlock(dir, 1);
+        brelse(parent_di_bh);
+        return status;
+}
+
+int ocfs2_mv_orphaned_inode_to_new(struct inode *dir,
+                                   struct inode *inode,
+                                   struct dentry *dentry)
+{
+        int status = 0;
+        struct buffer_head *parent_di_bh = NULL;
+        handle_t *handle = NULL;
+        struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
+        struct ocfs2_dinode *dir_di, *di;
+        struct inode *orphan_dir_inode = NULL;
+        struct buffer_head *orphan_dir_bh = NULL;
+        struct buffer_head *di_bh = NULL;
+        struct ocfs2_dir_lookup_result lookup = { NULL, };
+
+        mlog_entry("(0x%p, 0x%p, %.*s')\n", dir, dentry,
+                   dentry->d_name.len, dentry->d_name.name);
+
+        status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
+        if (status < 0) {
+                if (status != -ENOENT)
+                        mlog_errno(status);
+                return status;
+        }
+
+        dir_di = (struct ocfs2_dinode *) parent_di_bh->b_data;
+        if (!dir_di->i_links_count) {
+                /* can't make a file in a deleted directory. */
+                status = -ENOENT;
+                goto leave;
+        }
+
+        status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
+                                           dentry->d_name.len);
+        if (status)
+                goto leave;
+
+        /* get a spot inside the dir. */
+        status = ocfs2_prepare_dir_for_insert(osb, dir, parent_di_bh,
+                                              dentry->d_name.name,
+                                              dentry->d_name.len, &lookup);
+        if (status < 0) {
+                mlog_errno(status);
+                goto leave;
+        }
+
+        orphan_dir_inode = ocfs2_get_system_file_inode(osb,
+                                                       ORPHAN_DIR_SYSTEM_INODE,
+                                                       osb->slot_num);
+        if (!orphan_dir_inode) {
+                status = -EEXIST;
+                mlog_errno(status);
+                goto leave;
+        }
+
+        mutex_lock(&orphan_dir_inode->i_mutex);
+
+        status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
+        if (status < 0) {
+                mlog_errno(status);
+                mutex_unlock(&orphan_dir_inode->i_mutex);
+                iput(orphan_dir_inode);
+                goto leave;
+        }
+
+        status = ocfs2_read_inode_block(inode, &di_bh);
+        if (status < 0) {
+                mlog_errno(status);
+                goto orphan_unlock;
+        }
+
+        handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
+        if (IS_ERR(handle)) {
+                status = PTR_ERR(handle);
+                handle = NULL;
+                mlog_errno(status);
+                goto orphan_unlock;
+        }
+
+        status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
+                                         di_bh, OCFS2_JOURNAL_ACCESS_WRITE);
+        if (status < 0) {
+                mlog_errno(status);
+                goto out_commit;
+        }
+
+        status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
+                                  orphan_dir_bh);
+        if (status < 0) {
+                mlog_errno(status);
+                goto out_commit;
+        }
+
+        di = (struct ocfs2_dinode *)di_bh->b_data;
+        le32_add_cpu(&di->i_flags, -OCFS2_ORPHANED_FL);
+        di->i_orphaned_slot = 0;
+        ocfs2_journal_dirty(handle, di_bh);
+
+        status = ocfs2_add_entry(handle, dentry, inode,
+                                 OCFS2_I(inode)->ip_blkno, parent_di_bh,
+                                 &lookup);
+        if (status < 0) {
+                mlog_errno(status);
+                goto out_commit;
+        }
+
+        status = ocfs2_dentry_attach_lock(dentry, inode,
+                                          OCFS2_I(dir)->ip_blkno);
+        if (status) {
+                mlog_errno(status);
+                goto out_commit;
+        }
+
+        insert_inode_hash(inode);
+        dentry->d_op = &ocfs2_dentry_ops;
+        d_instantiate(dentry, inode);
+        status = 0;
+out_commit:
+        ocfs2_commit_trans(osb, handle);
+orphan_unlock:
+        ocfs2_inode_unlock(orphan_dir_inode, 1);
+        mutex_unlock(&orphan_dir_inode->i_mutex);
+        iput(orphan_dir_inode);
+leave:
+
+        ocfs2_inode_unlock(dir, 1);
+
+        brelse(di_bh);
+        brelse(parent_di_bh);
+        brelse(orphan_dir_bh);
+
+        ocfs2_free_dir_lookup_result(&lookup);
+
+        mlog_exit(status);
+
+        return status;
+}
+
 const struct inode_operations ocfs2_dir_iops = {
         .create         = ocfs2_create,
         .lookup         = ocfs2_lookup,
diff --git a/fs/ocfs2/namei.h b/fs/ocfs2/namei.h
index 688aef64c879..e5d059d4f115 100644
--- a/fs/ocfs2/namei.h
+++ b/fs/ocfs2/namei.h
@@ -35,5 +35,11 @@ int ocfs2_orphan_del(struct ocfs2_super *osb,
                      struct inode *orphan_dir_inode,
                      struct inode *inode,
                      struct buffer_head *orphan_dir_bh);
+int ocfs2_create_inode_in_orphan(struct inode *dir,
+                                 int mode,
+                                 struct inode **new_inode);
+int ocfs2_mv_orphaned_inode_to_new(struct inode *dir,
+                                   struct inode *new_inode,
+                                   struct dentry *new_dentry);
 
 #endif /* OCFS2_NAMEI_H */
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 39e1d5a39505..eae404602424 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -51,20 +51,51 @@
 /* For struct ocfs2_blockcheck_stats */
 #include "blockcheck.h"
 
+
+/* Caching of metadata buffers */
+
 /* Most user visible OCFS2 inodes will have very few pieces of
  * metadata, but larger files (including bitmaps, etc) must be taken
  * into account when designing an access scheme. We allow a small
  * amount of inlined blocks to be stored on an array and grow the
  * structure into a rb tree when necessary. */
-#define OCFS2_INODE_MAX_CACHE_ARRAY 2
+#define OCFS2_CACHE_INFO_MAX_ARRAY 2
+
+/* Flags for ocfs2_caching_info */
+
+enum ocfs2_caching_info_flags {
+        /* Indicates that the metadata cache is using the inline array */
+        OCFS2_CACHE_FL_INLINE   = 1<<1,
+};
 
+struct ocfs2_caching_operations;
 struct ocfs2_caching_info {
+        /*
+         * The parent structure provides the locks, but because the
+         * parent structure can differ, it provides locking operations
+         * to struct ocfs2_caching_info.
+         */
+        const struct ocfs2_caching_operations *ci_ops;
+
+        /* next two are protected by trans_inc_lock */
+        /* which transaction were we created on? Zero if none. */
+        unsigned long           ci_created_trans;
+        /* last transaction we were a part of. */
+        unsigned long           ci_last_trans;
+
+        /* Cache structures */
+        unsigned int            ci_flags;
         unsigned int            ci_num_cached;
         union {
-                sector_t        ci_array[OCFS2_INODE_MAX_CACHE_ARRAY];
+        sector_t        ci_array[OCFS2_CACHE_INFO_MAX_ARRAY];
                 struct rb_root  ci_tree;
         } ci_cache;
 };
+/*
+ * Need this prototype here instead of in uptodate.h because journal.h
+ * uses it.
+ */
+struct super_block *ocfs2_metadata_cache_get_super(struct ocfs2_caching_info *ci);
 
 /* this limits us to 256 nodes
  * if we need more, we can do a kmalloc for the map */
@@ -377,12 +408,17 @@ struct ocfs2_super
 
         /* the group we used to allocate inodes. */
         u64                             osb_inode_alloc_group;
+
+        /* rb tree root for refcount lock. */
+        struct rb_root  osb_rf_lock_tree;
+        struct ocfs2_refcount_tree *osb_ref_tree_lru;
 };
 
 #define OCFS2_SB(sb)        ((struct ocfs2_super *)(sb)->s_fs_info)
 
 /* Useful typedef for passing around journal access functions */
-typedef int (*ocfs2_journal_access_func)(handle_t *handle, struct inode *inode,
+typedef int (*ocfs2_journal_access_func)(handle_t *handle,
+                                         struct ocfs2_caching_info *ci,
                                          struct buffer_head *bh, int type);
 
 static inline int ocfs2_should_order_data(struct inode *inode)
@@ -480,6 +516,13 @@ static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n)
         ocfs2_set_links_count(di, links);
 }
 
+static inline int ocfs2_refcount_tree(struct ocfs2_super *osb)
+{
+        if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE)
+                return 1;
+        return 0;
+}
+
 /* set / clear functions because cluster events can make these happen
  * in parallel so we want the transitions to be atomic. this also
  * means that any future flags osb_flags must be protected by spinlock
@@ -578,6 +621,9 @@ static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb)
 #define OCFS2_IS_VALID_DX_LEAF(ptr)                                     \
         (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE))
 
+#define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr)                              \
+        (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE))
+
 static inline unsigned long ino_from_blkno(struct super_block *sb,
                                            u64 blkno)
 {
diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h
index 7ab6e9e5e77c..e9431e4a5e7c 100644
--- a/fs/ocfs2/ocfs2_fs.h
+++ b/fs/ocfs2/ocfs2_fs.h
@@ -68,6 +68,7 @@
 #define OCFS2_DIR_TRAILER_SIGNATURE     "DIRTRL1"
 #define OCFS2_DX_ROOT_SIGNATURE         "DXDIR01"
 #define OCFS2_DX_LEAF_SIGNATURE         "DXLEAF1"
+#define OCFS2_REFCOUNT_BLOCK_SIGNATURE  "REFCNT1"
 
 /* Compatibility flags */
 #define OCFS2_HAS_COMPAT_FEATURE(sb,mask)                       \
@@ -98,7 +99,8 @@
                                          | OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK \
                                          | OCFS2_FEATURE_INCOMPAT_XATTR \
                                          | OCFS2_FEATURE_INCOMPAT_META_ECC \
-                                         | OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS)
+                                         | OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS \
+                                         | OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE)
 #define OCFS2_FEATURE_RO_COMPAT_SUPP    (OCFS2_FEATURE_RO_COMPAT_UNWRITTEN \
                                          | OCFS2_FEATURE_RO_COMPAT_USRQUOTA \
                                          | OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
@@ -160,6 +162,9 @@
 /* Metadata checksum and error correction */
 #define OCFS2_FEATURE_INCOMPAT_META_ECC         0x0800
 
+/* Refcount tree support */
+#define OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE    0x1000
+
 /*
  * backup superblock flag is used to indicate that this volume
  * has backup superblocks.
@@ -223,6 +228,7 @@
 #define OCFS2_HAS_XATTR_FL      (0x0002)
 #define OCFS2_INLINE_XATTR_FL   (0x0004)
 #define OCFS2_INDEXED_DIR_FL    (0x0008)
+#define OCFS2_HAS_REFCOUNT_FL   (0x0010)
 
 /* Inode attributes, keep in sync with EXT2 */
 #define OCFS2_SECRM_FL          (0x00000001)    /* Secure deletion */
@@ -241,8 +247,11 @@
 /*
  * Extent record flags (e_node.leaf.flags)
  */
-#define OCFS2_EXT_UNWRITTEN     (0x01)  /* Extent is allocated but
-                                         * unwritten */
+#define OCFS2_EXT_UNWRITTEN             (0x01)  /* Extent is allocated but
+                                                 * unwritten */
+#define OCFS2_EXT_REFCOUNTED            (0x02)  /* Extent is reference
+                                                 * counted in an associated
+                                                 * refcount tree */
 
 /*
  * ioctl commands
@@ -292,6 +301,15 @@ struct ocfs2_new_group_input {
 #define OCFS2_IOC_GROUP_ADD     _IOW('o', 2,struct ocfs2_new_group_input)
 #define OCFS2_IOC_GROUP_ADD64   _IOW('o', 3,struct ocfs2_new_group_input)
 
+/* Used to pass 2 file names to reflink. */
+struct reflink_arguments {
+        __u64 old_path;
+        __u64 new_path;
+        __u64 preserve;
+};
+#define OCFS2_IOC_REFLINK       _IOW('o', 4, struct reflink_arguments)
+
+
 /*
  * Journal Flags (ocfs2_dinode.id1.journal1.i_flags)
  */
@@ -717,7 +735,8 @@ struct ocfs2_dinode {
         __le64 i_xattr_loc;
 /*80*/  struct ocfs2_block_check i_check;       /* Error checking */
 /*88*/  __le64 i_dx_root;               /* Pointer to dir index root block */
-        __le64 i_reserved2[5];
+/*90*/  __le64 i_refcount_loc;
+        __le64 i_reserved2[4];
 /*B8*/  union {
                 __le64 i_pad1;          /* Generic way to refer to this
                                            64bit union */
@@ -901,6 +920,60 @@ struct ocfs2_group_desc
 /*40*/  __u8    bg_bitmap[0];
 };
 
+struct ocfs2_refcount_rec {
+/*00*/  __le64 r_cpos;          /* Physical offset, in clusters */
+        __le32 r_clusters;      /* Clusters covered by this extent */
+        __le32 r_refcount;      /* Reference count of this extent */
+/*10*/
+};
+#define OCFS2_32BIT_POS_MASK            (0xffffffffULL)
+
+#define OCFS2_REFCOUNT_LEAF_FL          (0x00000001)
+#define OCFS2_REFCOUNT_TREE_FL          (0x00000002)
+
+struct ocfs2_refcount_list {
+/*00*/  __le16 rl_count;        /* Maximum number of entries possible
+                                   in rl_records */
+        __le16 rl_used;         /* Current number of used records */
+        __le32 rl_reserved2;
+        __le64 rl_reserved1;    /* Pad to sizeof(ocfs2_refcount_record) */
+/*10*/  struct ocfs2_refcount_rec rl_recs[0];   /* Refcount records */
+};
+
+
+struct ocfs2_refcount_block {
+/*00*/  __u8 rf_signature[8];           /* Signature for verification */
+        __le16 rf_suballoc_slot;        /* Slot suballocator this block
+                                           belongs to */
+        __le16 rf_suballoc_bit;         /* Bit offset in suballocator
+                                           block group */
+        __le32 rf_fs_generation;        /* Must match superblock */
+/*10*/  __le64 rf_blkno;                /* Offset on disk, in blocks */
+        __le64 rf_parent;               /* Parent block, only valid if
+                                           OCFS2_REFCOUNT_LEAF_FL is set in
+                                           rf_flags */
+/*20*/  struct ocfs2_block_check rf_check;      /* Error checking */
+        __le64 rf_last_eb_blk;          /* Pointer to last extent block */
+/*30*/  __le32 rf_count;                /* Number of inodes sharing this
+                                           refcount tree */
+        __le32 rf_flags;                /* See the flags above */
+        __le32 rf_clusters;             /* clusters covered by refcount tree. */
+        __le32 rf_cpos;                 /* cluster offset in refcount tree.*/
+/*40*/  __le32 rf_generation;           /* generation number. all be the same
+                                         * for the same refcount tree. */
+        __le32 rf_reserved0;
+        __le64 rf_reserved1[7];
+/*80*/  union {
+                struct ocfs2_refcount_list rf_records;  /* List of refcount
+                                                          records */
+                struct ocfs2_extent_list rf_list;       /* Extent record list,
+                                                        only valid if
+                                                        OCFS2_REFCOUNT_TREE_FL
+                                                        is set in rf_flags */
+        };
+/* Actual on-disk size is one block */
+};
+
 /*
  * On disk extended attribute structure for OCFS2.
  */
@@ -1312,6 +1385,32 @@ static inline u16 ocfs2_xattr_recs_per_xb(struct super_block *sb)
 
         return size / sizeof(struct ocfs2_extent_rec);
 }
+
+static inline u16 ocfs2_extent_recs_per_rb(struct super_block *sb)
+{
+        int size;
+
+        size = sb->s_blocksize -
+                offsetof(struct ocfs2_refcount_block, rf_list.l_recs);
+
+        return size / sizeof(struct ocfs2_extent_rec);
+}
+
+static inline u16 ocfs2_refcount_recs_per_rb(struct super_block *sb)
+{
+        int size;
+
+        size = sb->s_blocksize -
+                offsetof(struct ocfs2_refcount_block, rf_records.rl_recs);
+
+        return size / sizeof(struct ocfs2_refcount_rec);
+}
+
+static inline u32
+ocfs2_get_ref_rec_low_cpos(const struct ocfs2_refcount_rec *rec)
+{
+        return le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK;
+}
 #else
 static inline int ocfs2_fast_symlink_chars(int blocksize)
 {
diff --git a/fs/ocfs2/ocfs2_lockid.h b/fs/ocfs2/ocfs2_lockid.h
index c212cf5a2bdf..d277aabf5dfb 100644
--- a/fs/ocfs2/ocfs2_lockid.h
+++ b/fs/ocfs2/ocfs2_lockid.h
@@ -49,6 +49,7 @@ enum ocfs2_lock_type {
         OCFS2_LOCK_TYPE_QINFO,
         OCFS2_LOCK_TYPE_NFS_SYNC,
         OCFS2_LOCK_TYPE_ORPHAN_SCAN,
+        OCFS2_LOCK_TYPE_REFCOUNT,
         OCFS2_NUM_LOCK_TYPES
 };
 
@@ -89,6 +90,9 @@ static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type)
                 case OCFS2_LOCK_TYPE_ORPHAN_SCAN:
                         c = 'P';
                         break;
+                case OCFS2_LOCK_TYPE_REFCOUNT:
+                        c = 'T';
+                        break;
                 default:
                         c = '\0';
         }
@@ -110,6 +114,7 @@ static char *ocfs2_lock_type_strings[] = {
         [OCFS2_LOCK_TYPE_QINFO] = "Quota",
         [OCFS2_LOCK_TYPE_NFS_SYNC] = "NFSSync",
         [OCFS2_LOCK_TYPE_ORPHAN_SCAN] = "OrphanScan",
+        [OCFS2_LOCK_TYPE_REFCOUNT] = "Refcount",
 };
 
 static inline const char *ocfs2_lock_type_string(enum ocfs2_lock_type type)
diff --git a/fs/ocfs2/quota.h b/fs/ocfs2/quota.h
index 3fb96fcd4c81..e5df9d170b0c 100644
--- a/fs/ocfs2/quota.h
+++ b/fs/ocfs2/quota.h
@@ -109,7 +109,7 @@ void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
 int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
                            struct buffer_head **bh);
 
-extern struct dquot_operations ocfs2_quota_operations;
+extern const struct dquot_operations ocfs2_quota_operations;
 extern struct quota_format_type ocfs2_quota_format;
 
 int ocfs2_quota_setup(void);
diff --git a/fs/ocfs2/quota_global.c b/fs/ocfs2/quota_global.c
index 44f2a5e1d042..b437dc0c4cad 100644
--- a/fs/ocfs2/quota_global.c
+++ b/fs/ocfs2/quota_global.c
@@ -154,7 +154,7 @@ static int ocfs2_get_quota_block(struct inode *inode, int block,
                 err = -EIO;
                 mlog_errno(err);
         }
-        return err;;
+        return err;
 }
 
 /* Read data from global quotafile - avoid pagecache and such because we cannot
@@ -253,8 +253,9 @@ ssize_t ocfs2_quota_write(struct super_block *sb, int type,
         flush_dcache_page(bh->b_page);
         set_buffer_uptodate(bh);
         unlock_buffer(bh);
-        ocfs2_set_buffer_uptodate(gqinode, bh);
-        err = ocfs2_journal_access_dq(handle, gqinode, bh, ja_type);
+        ocfs2_set_buffer_uptodate(INODE_CACHE(gqinode), bh);
+        err = ocfs2_journal_access_dq(handle, INODE_CACHE(gqinode), bh,
+                                      ja_type);
         if (err < 0) {
                 brelse(bh);
                 goto out;
@@ -849,7 +850,7 @@ static void ocfs2_destroy_dquot(struct dquot *dquot)
         kmem_cache_free(ocfs2_dquot_cachep, dquot);
 }
 
-struct dquot_operations ocfs2_quota_operations = {
+const struct dquot_operations ocfs2_quota_operations = {
         .initialize     = dquot_initialize,
         .drop           = dquot_drop,
         .alloc_space    = dquot_alloc_space,
diff --git a/fs/ocfs2/quota_local.c b/fs/ocfs2/quota_local.c
index bdb09cb6e1fe..1a2c50a759fa 100644
--- a/fs/ocfs2/quota_local.c
+++ b/fs/ocfs2/quota_local.c
@@ -108,7 +108,7 @@ static int ocfs2_modify_bh(struct inode *inode, struct buffer_head *bh,
                 mlog_errno(status);
                 return status;
         }
-        status = ocfs2_journal_access_dq(handle, inode, bh,
+        status = ocfs2_journal_access_dq(handle, INODE_CACHE(inode), bh,
                                          OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
@@ -510,7 +510,8 @@ static int ocfs2_recover_local_quota_file(struct inode *lqinode,
                                 goto out_commit;
                         }
                         /* Release local quota file entry */
-                        status = ocfs2_journal_access_dq(handle, lqinode,
+                        status = ocfs2_journal_access_dq(handle,
+                                        INODE_CACHE(lqinode),
                                         qbh, OCFS2_JOURNAL_ACCESS_WRITE);
                         if (status < 0) {
                                 mlog_errno(status);
@@ -619,7 +620,8 @@ int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
                         mlog_errno(status);
                         goto out_bh;
                 }
-                status = ocfs2_journal_access_dq(handle, lqinode, bh,
+                status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode),
+                                                 bh,
                                                  OCFS2_JOURNAL_ACCESS_WRITE);
                 if (status < 0) {
                         mlog_errno(status);
@@ -993,8 +995,8 @@ static struct ocfs2_quota_chunk *ocfs2_local_quota_add_chunk(
                 goto out_trans;
         }
         dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
-        ocfs2_set_new_buffer_uptodate(lqinode, bh);
-        status = ocfs2_journal_access_dq(handle, lqinode, bh,
+        ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), bh);
+        status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), bh,
                                          OCFS2_JOURNAL_ACCESS_CREATE);
         if (status < 0) {
                 mlog_errno(status);
@@ -1027,8 +1029,8 @@ static struct ocfs2_quota_chunk *ocfs2_local_quota_add_chunk(
                 mlog_errno(status);
                 goto out_trans;
         }
-        ocfs2_set_new_buffer_uptodate(lqinode, dbh);
-        status = ocfs2_journal_access_dq(handle, lqinode, dbh,
+        ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), dbh);
+        status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), dbh,
                                          OCFS2_JOURNAL_ACCESS_CREATE);
         if (status < 0) {
                 mlog_errno(status);
@@ -1131,7 +1133,7 @@ static struct ocfs2_quota_chunk *ocfs2_extend_local_quota_file(
                 mlog_errno(status);
                 goto out;
         }
-        ocfs2_set_new_buffer_uptodate(lqinode, bh);
+        ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), bh);
 
         /* Local quota info, chunk header and the new block we initialize */
         handle = ocfs2_start_trans(OCFS2_SB(sb),
@@ -1143,7 +1145,7 @@ static struct ocfs2_quota_chunk *ocfs2_extend_local_quota_file(
                 goto out;
         }
         /* Zero created block */
-        status = ocfs2_journal_access_dq(handle, lqinode, bh,
+        status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), bh,
                                  OCFS2_JOURNAL_ACCESS_CREATE);
         if (status < 0) {
                 mlog_errno(status);
@@ -1158,7 +1160,8 @@ static struct ocfs2_quota_chunk *ocfs2_extend_local_quota_file(
                 goto out_trans;
         }
         /* Update chunk header */
-        status = ocfs2_journal_access_dq(handle, lqinode, chunk->qc_headerbh,
+        status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode),
+                                         chunk->qc_headerbh,
                                  OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
@@ -1292,7 +1295,8 @@ static int ocfs2_local_release_dquot(struct dquot *dquot)
                 goto out;
         }
 
-        status = ocfs2_journal_access_dq(handle, sb_dqopt(sb)->files[type],
+        status = ocfs2_journal_access_dq(handle,
+                        INODE_CACHE(sb_dqopt(sb)->files[type]),
                         od->dq_chunk->qc_headerbh, OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
new file mode 100644
index 000000000000..60287fc56bcb
--- /dev/null
+++ b/fs/ocfs2/refcounttree.c
@@ -0,0 +1,4313 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * refcounttree.c
+ *
+ * Copyright (C) 2009 Oracle.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/sort.h>
+#define MLOG_MASK_PREFIX ML_REFCOUNT
+#include <cluster/masklog.h>
+#include "ocfs2.h"
+#include "inode.h"
+#include "alloc.h"
+#include "suballoc.h"
+#include "journal.h"
+#include "uptodate.h"
+#include "super.h"
+#include "buffer_head_io.h"
+#include "blockcheck.h"
+#include "refcounttree.h"
+#include "sysfile.h"
+#include "dlmglue.h"
+#include "extent_map.h"
+#include "aops.h"
+#include "xattr.h"
+#include "namei.h"
+
+#include <linux/bio.h>
+#include <linux/blkdev.h>
+#include <linux/gfp.h>
+#include <linux/slab.h>
+#include <linux/writeback.h>
+#include <linux/pagevec.h>
+#include <linux/swap.h>
+#include <linux/security.h>
+#include <linux/fsnotify.h>
+#include <linux/quotaops.h>
+#include <linux/namei.h>
+#include <linux/mount.h>
+
+struct ocfs2_cow_context {
+        struct inode *inode;
+        u32 cow_start;
+        u32 cow_len;
+        struct ocfs2_extent_tree data_et;
+        struct ocfs2_refcount_tree *ref_tree;
+        struct buffer_head *ref_root_bh;
+        struct ocfs2_alloc_context *meta_ac;
+        struct ocfs2_alloc_context *data_ac;
+        struct ocfs2_cached_dealloc_ctxt dealloc;
+        void *cow_object;
+        struct ocfs2_post_refcount *post_refcount;
+        int extra_credits;
+        int (*get_clusters)(struct ocfs2_cow_context *context,
+                            u32 v_cluster, u32 *p_cluster,
+                            u32 *num_clusters,
+                            unsigned int *extent_flags);
+        int (*cow_duplicate_clusters)(handle_t *handle,
+                                      struct ocfs2_cow_context *context,
+                                      u32 cpos, u32 old_cluster,
+                                      u32 new_cluster, u32 new_len);
+};
+
+static inline struct ocfs2_refcount_tree *
+cache_info_to_refcount(struct ocfs2_caching_info *ci)
+{
+        return container_of(ci, struct ocfs2_refcount_tree, rf_ci);
+}
+
+static int ocfs2_validate_refcount_block(struct super_block *sb,
+                                         struct buffer_head *bh)
+{
+        int rc;
+        struct ocfs2_refcount_block *rb =
+                (struct ocfs2_refcount_block *)bh->b_data;
+
+        mlog(0, "Validating refcount block %llu\n",
+             (unsigned long long)bh->b_blocknr);
+
+        BUG_ON(!buffer_uptodate(bh));
+
+        /*
+         * If the ecc fails, we return the error but otherwise
+         * leave the filesystem running.  We know any error is
+         * local to this block.
+         */
+        rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &rb->rf_check);
+        if (rc) {
+                mlog(ML_ERROR, "Checksum failed for refcount block %llu\n",
+                     (unsigned long long)bh->b_blocknr);
+                return rc;
+        }
+
+
+        if (!OCFS2_IS_VALID_REFCOUNT_BLOCK(rb)) {
+                ocfs2_error(sb,
+                            "Refcount block #%llu has bad signature %.*s",
+                            (unsigned long long)bh->b_blocknr, 7,
+                            rb->rf_signature);
+                return -EINVAL;
+        }
+
+        if (le64_to_cpu(rb->rf_blkno) != bh->b_blocknr) {
+                ocfs2_error(sb,
+                            "Refcount block #%llu has an invalid rf_blkno "
+                            "of %llu",
+                            (unsigned long long)bh->b_blocknr,
+                            (unsigned long long)le64_to_cpu(rb->rf_blkno));
+                return -EINVAL;
+        }
+
+        if (le32_to_cpu(rb->rf_fs_generation) != OCFS2_SB(sb)->fs_generation) {
+                ocfs2_error(sb,
+                            "Refcount block #%llu has an invalid "
+                            "rf_fs_generation of #%u",
+                            (unsigned long long)bh->b_blocknr,
+                            le32_to_cpu(rb->rf_fs_generation));
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static int ocfs2_read_refcount_block(struct ocfs2_caching_info *ci,
+                                     u64 rb_blkno,
+                                     struct buffer_head **bh)
+{
+        int rc;
+        struct buffer_head *tmp = *bh;
+
+        rc = ocfs2_read_block(ci, rb_blkno, &tmp,
+                              ocfs2_validate_refcount_block);
+
+        /* If ocfs2_read_block() got us a new bh, pass it up. */
+        if (!rc && !*bh)
+                *bh = tmp;
+
+        return rc;
+}
+
+static u64 ocfs2_refcount_cache_owner(struct ocfs2_caching_info *ci)
+{
+        struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
+
+        return rf->rf_blkno;
+}
+
+static struct super_block *
+ocfs2_refcount_cache_get_super(struct ocfs2_caching_info *ci)
+{
+        struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
+
+        return rf->rf_sb;
+}
+
+static void ocfs2_refcount_cache_lock(struct ocfs2_caching_info *ci)
+{
+        struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
+
+        spin_lock(&rf->rf_lock);
+}
+
+static void ocfs2_refcount_cache_unlock(struct ocfs2_caching_info *ci)
+{
+        struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
+
+        spin_unlock(&rf->rf_lock);
+}
+
+static void ocfs2_refcount_cache_io_lock(struct ocfs2_caching_info *ci)
+{
+        struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
+
+        mutex_lock(&rf->rf_io_mutex);
+}
+
+static void ocfs2_refcount_cache_io_unlock(struct ocfs2_caching_info *ci)
+{
+        struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
+
+        mutex_unlock(&rf->rf_io_mutex);
+}
+
+static const struct ocfs2_caching_operations ocfs2_refcount_caching_ops = {
+        .co_owner               = ocfs2_refcount_cache_owner,
+        .co_get_super           = ocfs2_refcount_cache_get_super,
+        .co_cache_lock          = ocfs2_refcount_cache_lock,
+        .co_cache_unlock        = ocfs2_refcount_cache_unlock,
+        .co_io_lock             = ocfs2_refcount_cache_io_lock,
+        .co_io_unlock           = ocfs2_refcount_cache_io_unlock,
+};
+
+static struct ocfs2_refcount_tree *
+ocfs2_find_refcount_tree(struct ocfs2_super *osb, u64 blkno)
+{
+        struct rb_node *n = osb->osb_rf_lock_tree.rb_node;
+        struct ocfs2_refcount_tree *tree = NULL;
+
+        while (n) {
+                tree = rb_entry(n, struct ocfs2_refcount_tree, rf_node);
+
+                if (blkno < tree->rf_blkno)
+                        n = n->rb_left;
+                else if (blkno > tree->rf_blkno)
+                        n = n->rb_right;
+                else
+                        return tree;
+        }
+
+        return NULL;
+}
+
+/* osb_lock is already locked. */
+static void ocfs2_insert_refcount_tree(struct ocfs2_super *osb,
+                                       struct ocfs2_refcount_tree *new)
+{
+        u64 rf_blkno = new->rf_blkno;
+        struct rb_node *parent = NULL;
+        struct rb_node **p = &osb->osb_rf_lock_tree.rb_node;
+        struct ocfs2_refcount_tree *tmp;
+
+        while (*p) {
+                parent = *p;
+
+                tmp = rb_entry(parent, struct ocfs2_refcount_tree,
+                               rf_node);
+
+                if (rf_blkno < tmp->rf_blkno)
+                        p = &(*p)->rb_left;
+                else if (rf_blkno > tmp->rf_blkno)
+                        p = &(*p)->rb_right;
+                else {
+                        /* This should never happen! */
+                        mlog(ML_ERROR, "Duplicate refcount block %llu found!\n",
+                             (unsigned long long)rf_blkno);
+                        BUG();
+                }
+        }
+
+        rb_link_node(&new->rf_node, parent, p);
+        rb_insert_color(&new->rf_node, &osb->osb_rf_lock_tree);
+}
+
+static void ocfs2_free_refcount_tree(struct ocfs2_refcount_tree *tree)
+{
+        ocfs2_metadata_cache_exit(&tree->rf_ci);
+        ocfs2_simple_drop_lockres(OCFS2_SB(tree->rf_sb), &tree->rf_lockres);
+        ocfs2_lock_res_free(&tree->rf_lockres);
+        kfree(tree);
+}
+
+static inline void
+ocfs2_erase_refcount_tree_from_list_no_lock(struct ocfs2_super *osb,
+                                        struct ocfs2_refcount_tree *tree)
+{
+        rb_erase(&tree->rf_node, &osb->osb_rf_lock_tree);
+        if (osb->osb_ref_tree_lru && osb->osb_ref_tree_lru == tree)
+                osb->osb_ref_tree_lru = NULL;
+}
+
+static void ocfs2_erase_refcount_tree_from_list(struct ocfs2_super *osb,
+                                        struct ocfs2_refcount_tree *tree)
+{
+        spin_lock(&osb->osb_lock);
+        ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree);
+        spin_unlock(&osb->osb_lock);
+}
+
+void ocfs2_kref_remove_refcount_tree(struct kref *kref)
+{
+        struct ocfs2_refcount_tree *tree =
+                container_of(kref, struct ocfs2_refcount_tree, rf_getcnt);
+
+        ocfs2_free_refcount_tree(tree);
+}
+
+static inline void
+ocfs2_refcount_tree_get(struct ocfs2_refcount_tree *tree)
+{
+        kref_get(&tree->rf_getcnt);
+}
+
+static inline void
+ocfs2_refcount_tree_put(struct ocfs2_refcount_tree *tree)
+{
+        kref_put(&tree->rf_getcnt, ocfs2_kref_remove_refcount_tree);
+}
+
+static inline void ocfs2_init_refcount_tree_ci(struct ocfs2_refcount_tree *new,
+                                               struct super_block *sb)
+{
+        ocfs2_metadata_cache_init(&new->rf_ci, &ocfs2_refcount_caching_ops);
+        mutex_init(&new->rf_io_mutex);
+        new->rf_sb = sb;
+        spin_lock_init(&new->rf_lock);
+}
+
+static inline void ocfs2_init_refcount_tree_lock(struct ocfs2_super *osb,
+                                        struct ocfs2_refcount_tree *new,
+                                        u64 rf_blkno, u32 generation)
+{
+        init_rwsem(&new->rf_sem);
+        ocfs2_refcount_lock_res_init(&new->rf_lockres, osb,
+                                     rf_blkno, generation);
+}
+
+static struct ocfs2_refcount_tree*
+ocfs2_allocate_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno)
+{
+        struct ocfs2_refcount_tree *new;
+
+        new = kzalloc(sizeof(struct ocfs2_refcount_tree), GFP_NOFS);
+        if (!new)
+                return NULL;
+
+        new->rf_blkno = rf_blkno;
+        kref_init(&new->rf_getcnt);
+        ocfs2_init_refcount_tree_ci(new, osb->sb);
+
+        return new;
+}
+
+static int ocfs2_get_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno,
+                                   struct ocfs2_refcount_tree **ret_tree)
+{
+        int ret = 0;
+        struct ocfs2_refcount_tree *tree, *new = NULL;
+        struct buffer_head *ref_root_bh = NULL;
+        struct ocfs2_refcount_block *ref_rb;
+
+        spin_lock(&osb->osb_lock);
+        if (osb->osb_ref_tree_lru &&
+            osb->osb_ref_tree_lru->rf_blkno == rf_blkno)
+                tree = osb->osb_ref_tree_lru;
+        else
+                tree = ocfs2_find_refcount_tree(osb, rf_blkno);
+        if (tree)
+                goto out;
+
+        spin_unlock(&osb->osb_lock);
+
+        new = ocfs2_allocate_refcount_tree(osb, rf_blkno);
+        if (!new) {
+                ret = -ENOMEM;
+                mlog_errno(ret);
+                return ret;
+        }
+        /*
+         * We need the generation to create the refcount tree lock and since
+         * it isn't changed during the tree modification, we are safe here to
+         * read without protection.
+         * We also have to purge the cache after we create the lock since the
+         * refcount block may have the stale data. It can only be trusted when
+         * we hold the refcount lock.
+         */
+        ret = ocfs2_read_refcount_block(&new->rf_ci, rf_blkno, &ref_root_bh);
+        if (ret) {
+                mlog_errno(ret);
+                ocfs2_metadata_cache_exit(&new->rf_ci);
+                kfree(new);
+                return ret;
+        }
+
+        ref_rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
+        new->rf_generation = le32_to_cpu(ref_rb->rf_generation);
+        ocfs2_init_refcount_tree_lock(osb, new, rf_blkno,
+                                      new->rf_generation);
+        ocfs2_metadata_cache_purge(&new->rf_ci);
+
+        spin_lock(&osb->osb_lock);
+        tree = ocfs2_find_refcount_tree(osb, rf_blkno);
+        if (tree)
+                goto out;
+
+        ocfs2_insert_refcount_tree(osb, new);
+
+        tree = new;
+        new = NULL;
+
+out:
+        *ret_tree = tree;
+
+        osb->osb_ref_tree_lru = tree;
+
+        spin_unlock(&osb->osb_lock);
+
+        if (new)
+                ocfs2_free_refcount_tree(new);
+
+        brelse(ref_root_bh);
+        return ret;
+}
+
+static int ocfs2_get_refcount_block(struct inode *inode, u64 *ref_blkno)
+{
+        int ret;
+        struct buffer_head *di_bh = NULL;
+        struct ocfs2_dinode *di;
+
+        ret = ocfs2_read_inode_block(inode, &di_bh);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
+
+        di = (struct ocfs2_dinode *)di_bh->b_data;
+        *ref_blkno = le64_to_cpu(di->i_refcount_loc);
+        brelse(di_bh);
+out:
+        return ret;
+}
+
+static int __ocfs2_lock_refcount_tree(struct ocfs2_super *osb,
+                                      struct ocfs2_refcount_tree *tree, int rw)
+{
+        int ret;
+
+        ret = ocfs2_refcount_lock(tree, rw);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        if (rw)
+                down_write(&tree->rf_sem);
+        else
+                down_read(&tree->rf_sem);
+
+out:
+        return ret;
+}
+
+/*
+ * Lock the refcount tree pointed by ref_blkno and return the tree.
+ * In most case, we lock the tree and read the refcount block.
+ * So read it here if the caller really needs it.
+ *
+ * If the tree has been re-created by other node, it will free the
+ * old one and re-create it.
+ */
+int ocfs2_lock_refcount_tree(struct ocfs2_super *osb,
+                             u64 ref_blkno, int rw,
+                             struct ocfs2_refcount_tree **ret_tree,
+                             struct buffer_head **ref_bh)
+{
+        int ret, delete_tree = 0;
+        struct ocfs2_refcount_tree *tree = NULL;
+        struct buffer_head *ref_root_bh = NULL;
+        struct ocfs2_refcount_block *rb;
+
+again:
+        ret = ocfs2_get_refcount_tree(osb, ref_blkno, &tree);
+        if (ret) {
+                mlog_errno(ret);
+                return ret;
+        }
+
+        ocfs2_refcount_tree_get(tree);
+
+        ret = __ocfs2_lock_refcount_tree(osb, tree, rw);
+        if (ret) {
+                mlog_errno(ret);
+                ocfs2_refcount_tree_put(tree);
+                goto out;
+        }
+
+        ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno,
+                                        &ref_root_bh);
+        if (ret) {
+                mlog_errno(ret);
+                ocfs2_unlock_refcount_tree(osb, tree, rw);
+                ocfs2_refcount_tree_put(tree);
+                goto out;
+        }
+
+        rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
+        /*
+         * If the refcount block has been freed and re-created, we may need
+         * to recreate the refcount tree also.
+         *
+         * Here we just remove the tree from the rb-tree, and the last
+         * kref holder will unlock and delete this refcount_tree.
+         * Then we goto "again" and ocfs2_get_refcount_tree will create
+         * the new refcount tree for us.
+         */
+        if (tree->rf_generation != le32_to_cpu(rb->rf_generation)) {
+                if (!tree->rf_removed) {
+                        ocfs2_erase_refcount_tree_from_list(osb, tree);
+                        tree->rf_removed = 1;
+                        delete_tree = 1;
+                }
+
+                ocfs2_unlock_refcount_tree(osb, tree, rw);
+                /*
+                 * We get an extra reference when we create the refcount
+                 * tree, so another put will destroy it.
+                 */
+                if (delete_tree)
+                        ocfs2_refcount_tree_put(tree);
+                brelse(ref_root_bh);
+                ref_root_bh = NULL;
+                goto again;
+        }
+
+        *ret_tree = tree;
+        if (ref_bh) {
+                *ref_bh = ref_root_bh;
+                ref_root_bh = NULL;
+        }
+out:
+        brelse(ref_root_bh);
+        return ret;
+}
+
+int ocfs2_lock_refcount_tree_by_inode(struct inode *inode, int rw,
+                                      struct ocfs2_refcount_tree **ret_tree,
+                                      struct buffer_head **ref_bh)
+{
+        int ret;
+        u64 ref_blkno;
+
+        ret = ocfs2_get_refcount_block(inode, &ref_blkno);
+        if (ret) {
+                mlog_errno(ret);
+                return ret;
+        }
+
+        return ocfs2_lock_refcount_tree(OCFS2_SB(inode->i_sb), ref_blkno,
+                                        rw, ret_tree, ref_bh);
+}
+
+void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
+                                struct ocfs2_refcount_tree *tree, int rw)
+{
+        if (rw)
+                up_write(&tree->rf_sem);
+        else
+                up_read(&tree->rf_sem);
+
+        ocfs2_refcount_unlock(tree, rw);
+        ocfs2_refcount_tree_put(tree);
+}
+
+void ocfs2_purge_refcount_trees(struct ocfs2_super *osb)
+{
+        struct rb_node *node;
+        struct ocfs2_refcount_tree *tree;
+        struct rb_root *root = &osb->osb_rf_lock_tree;
+
+        while ((node = rb_last(root)) != NULL) {
+                tree = rb_entry(node, struct ocfs2_refcount_tree, rf_node);
+
+                mlog(0, "Purge tree %llu\n",
+                     (unsigned long long) tree->rf_blkno);
+
+                rb_erase(&tree->rf_node, root);
+                ocfs2_free_refcount_tree(tree);
+        }
+}
+
+/*
+ * Create a refcount tree for an inode.
+ * We take for granted that the inode is already locked.
+ */
+static int ocfs2_create_refcount_tree(struct inode *inode,
+                                      struct buffer_head *di_bh)
+{
+        int ret;
+        handle_t *handle = NULL;
+        struct ocfs2_alloc_context *meta_ac = NULL;
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct buffer_head *new_bh = NULL;
+        struct ocfs2_refcount_block *rb;
+        struct ocfs2_refcount_tree *new_tree = NULL, *tree = NULL;
+        u16 suballoc_bit_start;
+        u32 num_got;
+        u64 first_blkno;
+
+        BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL);
+
+        mlog(0, "create tree for inode %lu\n", inode->i_ino);
+
+        ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_CREATE_CREDITS);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
+                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
+                                   &suballoc_bit_start, &num_got,
+                                   &first_blkno);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        new_tree = ocfs2_allocate_refcount_tree(osb, first_blkno);
+        if (!new_tree) {
+                ret = -ENOMEM;
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        new_bh = sb_getblk(inode->i_sb, first_blkno);
+        ocfs2_set_new_buffer_uptodate(&new_tree->rf_ci, new_bh);
+
+        ret = ocfs2_journal_access_rb(handle, &new_tree->rf_ci, new_bh,
+                                      OCFS2_JOURNAL_ACCESS_CREATE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        /* Initialize ocfs2_refcount_block. */
+        rb = (struct ocfs2_refcount_block *)new_bh->b_data;
+        memset(rb, 0, inode->i_sb->s_blocksize);
+        strcpy((void *)rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
+        rb->rf_suballoc_slot = cpu_to_le16(osb->slot_num);
+        rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
+        rb->rf_fs_generation = cpu_to_le32(osb->fs_generation);
+        rb->rf_blkno = cpu_to_le64(first_blkno);
+        rb->rf_count = cpu_to_le32(1);
+        rb->rf_records.rl_count =
+                        cpu_to_le16(ocfs2_refcount_recs_per_rb(osb->sb));
+        spin_lock(&osb->osb_lock);
+        rb->rf_generation = osb->s_next_generation++;
+        spin_unlock(&osb->osb_lock);
+
+        ocfs2_journal_dirty(handle, new_bh);
+
+        spin_lock(&oi->ip_lock);
+        oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL;
+        di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
+        di->i_refcount_loc = cpu_to_le64(first_blkno);
+        spin_unlock(&oi->ip_lock);
+
+        mlog(0, "created tree for inode %lu, refblock %llu\n",
+             inode->i_ino, (unsigned long long)first_blkno);
+
+        ocfs2_journal_dirty(handle, di_bh);
+
+        /*
+         * We have to init the tree lock here since it will use
+         * the generation number to create it.
+         */
+        new_tree->rf_generation = le32_to_cpu(rb->rf_generation);
+        ocfs2_init_refcount_tree_lock(osb, new_tree, first_blkno,
+                                      new_tree->rf_generation);
+
+        spin_lock(&osb->osb_lock);
+        tree = ocfs2_find_refcount_tree(osb, first_blkno);
+
+        /*
+         * We've just created a new refcount tree in this block.  If
+         * we found a refcount tree on the ocfs2_super, it must be
+         * one we just deleted.  We free the old tree before
+         * inserting the new tree.
+         */
+        BUG_ON(tree && tree->rf_generation == new_tree->rf_generation);
+        if (tree)
+                ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree);
+        ocfs2_insert_refcount_tree(osb, new_tree);
+        spin_unlock(&osb->osb_lock);
+        new_tree = NULL;
+        if (tree)
+                ocfs2_refcount_tree_put(tree);
+
+out_commit:
+        ocfs2_commit_trans(osb, handle);
+
+out:
+        if (new_tree) {
+                ocfs2_metadata_cache_exit(&new_tree->rf_ci);
+                kfree(new_tree);
+        }
+
+        brelse(new_bh);
+        if (meta_ac)
+                ocfs2_free_alloc_context(meta_ac);
+
+        return ret;
+}
+
+static int ocfs2_set_refcount_tree(struct inode *inode,
+                                   struct buffer_head *di_bh,
+                                   u64 refcount_loc)
+{
+        int ret;
+        handle_t *handle = NULL;
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct buffer_head *ref_root_bh = NULL;
+        struct ocfs2_refcount_block *rb;
+        struct ocfs2_refcount_tree *ref_tree;
+
+        BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL);
+
+        ret = ocfs2_lock_refcount_tree(osb, refcount_loc, 1,
+                                       &ref_tree, &ref_root_bh);
+        if (ret) {
+                mlog_errno(ret);
+                return ret;
+        }
+
+        handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_SET_CREDITS);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
+                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, ref_root_bh,
+                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
+        le32_add_cpu(&rb->rf_count, 1);
+
+        ocfs2_journal_dirty(handle, ref_root_bh);
+
+        spin_lock(&oi->ip_lock);
+        oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL;
+        di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
+        di->i_refcount_loc = cpu_to_le64(refcount_loc);
+        spin_unlock(&oi->ip_lock);
+        ocfs2_journal_dirty(handle, di_bh);
+
+out_commit:
+        ocfs2_commit_trans(osb, handle);
+out:
+        ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
+        brelse(ref_root_bh);
+
+        return ret;
+}
+
+int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh)
+{
+        int ret, delete_tree = 0;
+        handle_t *handle = NULL;
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_refcount_block *rb;
+        struct inode *alloc_inode = NULL;
+        struct buffer_head *alloc_bh = NULL;
+        struct buffer_head *blk_bh = NULL;
+        struct ocfs2_refcount_tree *ref_tree;
+        int credits = OCFS2_REFCOUNT_TREE_REMOVE_CREDITS;
+        u64 blk = 0, bg_blkno = 0, ref_blkno = le64_to_cpu(di->i_refcount_loc);
+        u16 bit = 0;
+
+        if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL))
+                return 0;
+
+        BUG_ON(!ref_blkno);
+        ret = ocfs2_lock_refcount_tree(osb, ref_blkno, 1, &ref_tree, &blk_bh);
+        if (ret) {
+                mlog_errno(ret);
+                return ret;
+        }
+
+        rb = (struct ocfs2_refcount_block *)blk_bh->b_data;
+
+        /*
+         * If we are the last user, we need to free the block.
+         * So lock the allocator ahead.
+         */
+        if (le32_to_cpu(rb->rf_count) == 1) {
+                blk = le64_to_cpu(rb->rf_blkno);
+                bit = le16_to_cpu(rb->rf_suballoc_bit);
+                bg_blkno = ocfs2_which_suballoc_group(blk, bit);
+
+                alloc_inode = ocfs2_get_system_file_inode(osb,
+                                        EXTENT_ALLOC_SYSTEM_INODE,
+                                        le16_to_cpu(rb->rf_suballoc_slot));
+                if (!alloc_inode) {
+                        ret = -ENOMEM;
+                        mlog_errno(ret);
+                        goto out;
+                }
+                mutex_lock(&alloc_inode->i_mutex);
+
+                ret = ocfs2_inode_lock(alloc_inode, &alloc_bh, 1);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out_mutex;
+                }
+
+                credits += OCFS2_SUBALLOC_FREE;
+        }
+
+        handle = ocfs2_start_trans(osb, credits);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out_unlock;
+        }
+
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
+                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, blk_bh,
+                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        spin_lock(&oi->ip_lock);
+        oi->ip_dyn_features &= ~OCFS2_HAS_REFCOUNT_FL;
+        di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
+        di->i_refcount_loc = 0;
+        spin_unlock(&oi->ip_lock);
+        ocfs2_journal_dirty(handle, di_bh);
+
+        le32_add_cpu(&rb->rf_count , -1);
+        ocfs2_journal_dirty(handle, blk_bh);
+
+        if (!rb->rf_count) {
+                delete_tree = 1;
+                ocfs2_erase_refcount_tree_from_list(osb, ref_tree);
+                ret = ocfs2_free_suballoc_bits(handle, alloc_inode,
+                                               alloc_bh, bit, bg_blkno, 1);
+                if (ret)
+                        mlog_errno(ret);
+        }
+
+out_commit:
+        ocfs2_commit_trans(osb, handle);
+out_unlock:
+        if (alloc_inode) {
+                ocfs2_inode_unlock(alloc_inode, 1);
+                brelse(alloc_bh);
+        }
+out_mutex:
+        if (alloc_inode) {
+                mutex_unlock(&alloc_inode->i_mutex);
+                iput(alloc_inode);
+        }
+out:
+        ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
+        if (delete_tree)
+                ocfs2_refcount_tree_put(ref_tree);
+        brelse(blk_bh);
+
+        return ret;
+}
+
+static void ocfs2_find_refcount_rec_in_rl(struct ocfs2_caching_info *ci,
+                                          struct buffer_head *ref_leaf_bh,
+                                          u64 cpos, unsigned int len,
+                                          struct ocfs2_refcount_rec *ret_rec,
+                                          int *index)
+{
+        int i = 0;
+        struct ocfs2_refcount_block *rb =
+                (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
+        struct ocfs2_refcount_rec *rec = NULL;
+
+        for (; i < le16_to_cpu(rb->rf_records.rl_used); i++) {
+                rec = &rb->rf_records.rl_recs[i];
+
+                if (le64_to_cpu(rec->r_cpos) +
+                    le32_to_cpu(rec->r_clusters) <= cpos)
+                        continue;
+                else if (le64_to_cpu(rec->r_cpos) > cpos)
+                        break;
+
+                /* ok, cpos fail in this rec. Just return. */
+                if (ret_rec)
+                        *ret_rec = *rec;
+                goto out;
+        }
+
+        if (ret_rec) {
+                /* We meet with a hole here, so fake the rec. */
+                ret_rec->r_cpos = cpu_to_le64(cpos);
+                ret_rec->r_refcount = 0;
+                if (i < le16_to_cpu(rb->rf_records.rl_used) &&
+                    le64_to_cpu(rec->r_cpos) < cpos + len)
+                        ret_rec->r_clusters =
+                                cpu_to_le32(le64_to_cpu(rec->r_cpos) - cpos);
+                else
+                        ret_rec->r_clusters = cpu_to_le32(len);
+        }
+
+out:
+        *index = i;
+}
+
+/*
+ * Try to remove refcount tree. The mechanism is:
+ * 1) Check whether i_clusters == 0, if no, exit.
+ * 2) check whether we have i_xattr_loc in dinode. if yes, exit.
+ * 3) Check whether we have inline xattr stored outside, if yes, exit.
+ * 4) Remove the tree.
+ */
+int ocfs2_try_remove_refcount_tree(struct inode *inode,
+                                   struct buffer_head *di_bh)
+{
+        int ret;
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+
+        down_write(&oi->ip_xattr_sem);
+        down_write(&oi->ip_alloc_sem);
+
+        if (oi->ip_clusters)
+                goto out;
+
+        if ((oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) && di->i_xattr_loc)
+                goto out;
+
+        if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL &&
+            ocfs2_has_inline_xattr_value_outside(inode, di))
+                goto out;
+
+        ret = ocfs2_remove_refcount_tree(inode, di_bh);
+        if (ret)
+                mlog_errno(ret);
+out:
+        up_write(&oi->ip_alloc_sem);
+        up_write(&oi->ip_xattr_sem);
+        return 0;
+}
+
+/*
+ * Given a cpos and len, try to find the refcount record which contains cpos.
+ * 1. If cpos can be found in one refcount record, return the record.
+ * 2. If cpos can't be found, return a fake record which start from cpos
+ *    and end at a small value between cpos+len and start of the next record.
+ *    This fake record has r_refcount = 0.
+ */
+static int ocfs2_get_refcount_rec(struct ocfs2_caching_info *ci,
+                                  struct buffer_head *ref_root_bh,
+                                  u64 cpos, unsigned int len,
+                                  struct ocfs2_refcount_rec *ret_rec,
+                                  int *index,
+                                  struct buffer_head **ret_bh)
+{
+        int ret = 0, i, found;
+        u32 low_cpos;
+        struct ocfs2_extent_list *el;
+        struct ocfs2_extent_rec *tmp, *rec = NULL;
+        struct ocfs2_extent_block *eb;
+        struct buffer_head *eb_bh = NULL, *ref_leaf_bh = NULL;
+        struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
+        struct ocfs2_refcount_block *rb =
+                        (struct ocfs2_refcount_block *)ref_root_bh->b_data;
+
+        if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)) {
+                ocfs2_find_refcount_rec_in_rl(ci, ref_root_bh, cpos, len,
+                                              ret_rec, index);
+                *ret_bh = ref_root_bh;
+                get_bh(ref_root_bh);
+                return 0;
+        }
+
+        el = &rb->rf_list;
+        low_cpos = cpos & OCFS2_32BIT_POS_MASK;
+
+        if (el->l_tree_depth) {
+                ret = ocfs2_find_leaf(ci, el, low_cpos, &eb_bh);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                eb = (struct ocfs2_extent_block *) eb_bh->b_data;
+                el = &eb->h_list;
+
+                if (el->l_tree_depth) {
+                        ocfs2_error(sb,
+                        "refcount tree %llu has non zero tree "
+                        "depth in leaf btree tree block %llu\n",
+                        (unsigned long long)ocfs2_metadata_cache_owner(ci),
+                        (unsigned long long)eb_bh->b_blocknr);
+                        ret = -EROFS;
+                        goto out;
+                }
+        }
+
+        found = 0;
+        for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
+                rec = &el->l_recs[i];
+
+                if (le32_to_cpu(rec->e_cpos) <= low_cpos) {
+                        found = 1;
+                        break;
+                }
+        }
+
+        /* adjust len when we have ocfs2_extent_rec after it. */
+        if (found && i < le16_to_cpu(el->l_next_free_rec) - 1) {
+                tmp = &el->l_recs[i+1];
+
+                if (le32_to_cpu(tmp->e_cpos) < cpos + len)
+                        len = le32_to_cpu(tmp->e_cpos) - cpos;
+        }
+
+        ret = ocfs2_read_refcount_block(ci, le64_to_cpu(rec->e_blkno),
+                                        &ref_leaf_bh);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ocfs2_find_refcount_rec_in_rl(ci, ref_leaf_bh, cpos, len,
+                                      ret_rec, index);
+        *ret_bh = ref_leaf_bh;
+out:
+        brelse(eb_bh);
+        return ret;
+}
+
+enum ocfs2_ref_rec_contig {
+        REF_CONTIG_NONE = 0,
+        REF_CONTIG_LEFT,
+        REF_CONTIG_RIGHT,
+        REF_CONTIG_LEFTRIGHT,
+};
+
+static enum ocfs2_ref_rec_contig
+        ocfs2_refcount_rec_adjacent(struct ocfs2_refcount_block *rb,
+                                    int index)
+{
+        if ((rb->rf_records.rl_recs[index].r_refcount ==
+            rb->rf_records.rl_recs[index + 1].r_refcount) &&
+            (le64_to_cpu(rb->rf_records.rl_recs[index].r_cpos) +
+            le32_to_cpu(rb->rf_records.rl_recs[index].r_clusters) ==
+            le64_to_cpu(rb->rf_records.rl_recs[index + 1].r_cpos)))
+                return REF_CONTIG_RIGHT;
+
+        return REF_CONTIG_NONE;
+}
+
+static enum ocfs2_ref_rec_contig
+        ocfs2_refcount_rec_contig(struct ocfs2_refcount_block *rb,
+                                  int index)
+{
+        enum ocfs2_ref_rec_contig ret = REF_CONTIG_NONE;
+
+        if (index < le16_to_cpu(rb->rf_records.rl_used) - 1)
+                ret = ocfs2_refcount_rec_adjacent(rb, index);
+
+        if (index > 0) {
+                enum ocfs2_ref_rec_contig tmp;
+
+                tmp = ocfs2_refcount_rec_adjacent(rb, index - 1);
+
+                if (tmp == REF_CONTIG_RIGHT) {
+                        if (ret == REF_CONTIG_RIGHT)
+                                ret = REF_CONTIG_LEFTRIGHT;
+                        else
+                                ret = REF_CONTIG_LEFT;
+                }
+        }
+
+        return ret;
+}
+
+static void ocfs2_rotate_refcount_rec_left(struct ocfs2_refcount_block *rb,
+                                           int index)
+{
+        BUG_ON(rb->rf_records.rl_recs[index].r_refcount !=
+               rb->rf_records.rl_recs[index+1].r_refcount);
+
+        le32_add_cpu(&rb->rf_records.rl_recs[index].r_clusters,
+                     le32_to_cpu(rb->rf_records.rl_recs[index+1].r_clusters));
+
+        if (index < le16_to_cpu(rb->rf_records.rl_used) - 2)
+                memmove(&rb->rf_records.rl_recs[index + 1],
+                        &rb->rf_records.rl_recs[index + 2],
+                        sizeof(struct ocfs2_refcount_rec) *
+                        (le16_to_cpu(rb->rf_records.rl_used) - index - 2));
+
+        memset(&rb->rf_records.rl_recs[le16_to_cpu(rb->rf_records.rl_used) - 1],
+               0, sizeof(struct ocfs2_refcount_rec));
+        le16_add_cpu(&rb->rf_records.rl_used, -1);
+}
+
+/*
+ * Merge the refcount rec if we are contiguous with the adjacent recs.
+ */
+static void ocfs2_refcount_rec_merge(struct ocfs2_refcount_block *rb,
+                                     int index)
+{
+        enum ocfs2_ref_rec_contig contig =
+                                ocfs2_refcount_rec_contig(rb, index);
+
+        if (contig == REF_CONTIG_NONE)
+                return;
+
+        if (contig == REF_CONTIG_LEFT || contig == REF_CONTIG_LEFTRIGHT) {
+                BUG_ON(index == 0);
+                index--;
+        }
+
+        ocfs2_rotate_refcount_rec_left(rb, index);
+
+        if (contig == REF_CONTIG_LEFTRIGHT)
+                ocfs2_rotate_refcount_rec_left(rb, index);
+}
+
+/*
+ * Change the refcount indexed by "index" in ref_bh.
+ * If refcount reaches 0, remove it.
+ */
+static int ocfs2_change_refcount_rec(handle_t *handle,
+                                     struct ocfs2_caching_info *ci,
+                                     struct buffer_head *ref_leaf_bh,
+                                     int index, int merge, int change)
+{
+        int ret;
+        struct ocfs2_refcount_block *rb =
+                        (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
+        struct ocfs2_refcount_list *rl = &rb->rf_records;
+        struct ocfs2_refcount_rec *rec = &rl->rl_recs[index];
+
+        ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
+                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        mlog(0, "change index %d, old count %u, change %d\n", index,
+             le32_to_cpu(rec->r_refcount), change);
+        le32_add_cpu(&rec->r_refcount, change);
+
+        if (!rec->r_refcount) {
+                if (index != le16_to_cpu(rl->rl_used) - 1) {
+                        memmove(rec, rec + 1,
+                                (le16_to_cpu(rl->rl_used) - index - 1) *
+                                sizeof(struct ocfs2_refcount_rec));
+                        memset(&rl->rl_recs[le16_to_cpu(rl->rl_used) - 1],
+                               0, sizeof(struct ocfs2_refcount_rec));
+                }
+
+                le16_add_cpu(&rl->rl_used, -1);
+        } else if (merge)
+                ocfs2_refcount_rec_merge(rb, index);
+
+        ret = ocfs2_journal_dirty(handle, ref_leaf_bh);
+        if (ret)
+                mlog_errno(ret);
+out:
+        return ret;
+}
+
+static int ocfs2_expand_inline_ref_root(handle_t *handle,
+                                        struct ocfs2_caching_info *ci,
+                                        struct buffer_head *ref_root_bh,
+                                        struct buffer_head **ref_leaf_bh,
+                                        struct ocfs2_alloc_context *meta_ac)
+{
+        int ret;
+        u16 suballoc_bit_start;
+        u32 num_got;
+        u64 blkno;
+        struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
+        struct buffer_head *new_bh = NULL;
+        struct ocfs2_refcount_block *new_rb;
+        struct ocfs2_refcount_block *root_rb =
+                        (struct ocfs2_refcount_block *)ref_root_bh->b_data;
+
+        ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
+                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_claim_metadata(OCFS2_SB(sb), handle, meta_ac, 1,
+                                   &suballoc_bit_start, &num_got,
+                                   &blkno);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        new_bh = sb_getblk(sb, blkno);
+        if (new_bh == NULL) {
+                ret = -EIO;
+                mlog_errno(ret);
+                goto out;
+        }
+        ocfs2_set_new_buffer_uptodate(ci, new_bh);
+
+        ret = ocfs2_journal_access_rb(handle, ci, new_bh,
+                                      OCFS2_JOURNAL_ACCESS_CREATE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        /*
+         * Initialize ocfs2_refcount_block.
+         * It should contain the same information as the old root.
+         * so just memcpy it and change the corresponding field.
+         */
+        memcpy(new_bh->b_data, ref_root_bh->b_data, sb->s_blocksize);
+
+        new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
+        new_rb->rf_suballoc_slot = cpu_to_le16(OCFS2_SB(sb)->slot_num);
+        new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
+        new_rb->rf_blkno = cpu_to_le64(blkno);
+        new_rb->rf_cpos = cpu_to_le32(0);
+        new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr);
+        new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL);
+        ocfs2_journal_dirty(handle, new_bh);
+
+        /* Now change the root. */
+        memset(&root_rb->rf_list, 0, sb->s_blocksize -
+               offsetof(struct ocfs2_refcount_block, rf_list));
+        root_rb->rf_list.l_count = cpu_to_le16(ocfs2_extent_recs_per_rb(sb));
+        root_rb->rf_clusters = cpu_to_le32(1);
+        root_rb->rf_list.l_next_free_rec = cpu_to_le16(1);
+        root_rb->rf_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
+        root_rb->rf_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
+        root_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_TREE_FL);
+
+        ocfs2_journal_dirty(handle, ref_root_bh);
+
+        mlog(0, "new leaf block %llu, used %u\n", (unsigned long long)blkno,
+             le16_to_cpu(new_rb->rf_records.rl_used));
+
+        *ref_leaf_bh = new_bh;
+        new_bh = NULL;
+out:
+        brelse(new_bh);
+        return ret;
+}
+
+static int ocfs2_refcount_rec_no_intersect(struct ocfs2_refcount_rec *prev,
+                                           struct ocfs2_refcount_rec *next)
+{
+        if (ocfs2_get_ref_rec_low_cpos(prev) + le32_to_cpu(prev->r_clusters) <=
+                ocfs2_get_ref_rec_low_cpos(next))
+                return 1;
+
+        return 0;
+}
+
+static int cmp_refcount_rec_by_low_cpos(const void *a, const void *b)
+{
+        const struct ocfs2_refcount_rec *l = a, *r = b;
+        u32 l_cpos = ocfs2_get_ref_rec_low_cpos(l);
+        u32 r_cpos = ocfs2_get_ref_rec_low_cpos(r);
+
+        if (l_cpos > r_cpos)
+                return 1;
+        if (l_cpos < r_cpos)
+                return -1;
+        return 0;
+}
+
+static int cmp_refcount_rec_by_cpos(const void *a, const void *b)
+{
+        const struct ocfs2_refcount_rec *l = a, *r = b;
+        u64 l_cpos = le64_to_cpu(l->r_cpos);
+        u64 r_cpos = le64_to_cpu(r->r_cpos);
+
+        if (l_cpos > r_cpos)
+                return 1;
+        if (l_cpos < r_cpos)
+                return -1;
+        return 0;
+}
+
+static void swap_refcount_rec(void *a, void *b, int size)
+{
+        struct ocfs2_refcount_rec *l = a, *r = b, tmp;
+
+        tmp = *(struct ocfs2_refcount_rec *)l;
+        *(struct ocfs2_refcount_rec *)l =
+                        *(struct ocfs2_refcount_rec *)r;
+        *(struct ocfs2_refcount_rec *)r = tmp;
+}
+
+/*
+ * The refcount cpos are ordered by their 64bit cpos,
+ * But we will use the low 32 bit to be the e_cpos in the b-tree.
+ * So we need to make sure that this pos isn't intersected with others.
+ *
+ * Note: The refcount block is already sorted by their low 32 bit cpos,
+ *       So just try the middle pos first, and we will exit when we find
+ *       the good position.
+ */
+static int ocfs2_find_refcount_split_pos(struct ocfs2_refcount_list *rl,
+                                         u32 *split_pos, int *split_index)
+{
+        int num_used = le16_to_cpu(rl->rl_used);
+        int delta, middle = num_used / 2;
+
+        for (delta = 0; delta < middle; delta++) {
+                /* Let's check delta earlier than middle */
+                if (ocfs2_refcount_rec_no_intersect(
+                                        &rl->rl_recs[middle - delta - 1],
+                                        &rl->rl_recs[middle - delta])) {
+                        *split_index = middle - delta;
+                        break;
+                }
+
+                /* For even counts, don't walk off the end */
+                if ((middle + delta + 1) == num_used)
+                        continue;
+
+                /* Now try delta past middle */
+                if (ocfs2_refcount_rec_no_intersect(
+                                        &rl->rl_recs[middle + delta],
+                                        &rl->rl_recs[middle + delta + 1])) {
+                        *split_index = middle + delta + 1;
+                        break;
+                }
+        }
+
+        if (delta >= middle)
+                return -ENOSPC;
+
+        *split_pos = ocfs2_get_ref_rec_low_cpos(&rl->rl_recs[*split_index]);
+        return 0;
+}
+
+static int ocfs2_divide_leaf_refcount_block(struct buffer_head *ref_leaf_bh,
+                                            struct buffer_head *new_bh,
+                                            u32 *split_cpos)
+{
+        int split_index = 0, num_moved, ret;
+        u32 cpos = 0;
+        struct ocfs2_refcount_block *rb =
+                        (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
+        struct ocfs2_refcount_list *rl = &rb->rf_records;
+        struct ocfs2_refcount_block *new_rb =
+                        (struct ocfs2_refcount_block *)new_bh->b_data;
+        struct ocfs2_refcount_list *new_rl = &new_rb->rf_records;
+
+        mlog(0, "split old leaf refcount block %llu, count = %u, used = %u\n",
+             (unsigned long long)ref_leaf_bh->b_blocknr,
+             le32_to_cpu(rl->rl_count), le32_to_cpu(rl->rl_used));
+
+        /*
+         * XXX: Improvement later.
+         * If we know all the high 32 bit cpos is the same, no need to sort.
+         *
+         * In order to make the whole process safe, we do:
+         * 1. sort the entries by their low 32 bit cpos first so that we can
+         *    find the split cpos easily.
+         * 2. call ocfs2_insert_extent to insert the new refcount block.
+         * 3. move the refcount rec to the new block.
+         * 4. sort the entries by their 64 bit cpos.
+         * 5. dirty the new_rb and rb.
+         */
+        sort(&rl->rl_recs, le16_to_cpu(rl->rl_used),
+             sizeof(struct ocfs2_refcount_rec),
+             cmp_refcount_rec_by_low_cpos, swap_refcount_rec);
+
+        ret = ocfs2_find_refcount_split_pos(rl, &cpos, &split_index);
+        if (ret) {
+                mlog_errno(ret);
+                return ret;
+        }
+
+        new_rb->rf_cpos = cpu_to_le32(cpos);
+
+        /* move refcount records starting from split_index to the new block. */
+        num_moved = le16_to_cpu(rl->rl_used) - split_index;
+        memcpy(new_rl->rl_recs, &rl->rl_recs[split_index],
+               num_moved * sizeof(struct ocfs2_refcount_rec));
+
+        /*ok, remove the entries we just moved over to the other block. */
+        memset(&rl->rl_recs[split_index], 0,
+               num_moved * sizeof(struct ocfs2_refcount_rec));
+
+        /* change old and new rl_used accordingly. */
+        le16_add_cpu(&rl->rl_used, -num_moved);
+        new_rl->rl_used = cpu_to_le32(num_moved);
+
+        sort(&rl->rl_recs, le16_to_cpu(rl->rl_used),
+             sizeof(struct ocfs2_refcount_rec),
+             cmp_refcount_rec_by_cpos, swap_refcount_rec);
+
+        sort(&new_rl->rl_recs, le16_to_cpu(new_rl->rl_used),
+             sizeof(struct ocfs2_refcount_rec),
+             cmp_refcount_rec_by_cpos, swap_refcount_rec);
+
+        *split_cpos = cpos;
+        return 0;
+}
+
+static int ocfs2_new_leaf_refcount_block(handle_t *handle,
+                                         struct ocfs2_caching_info *ci,
+                                         struct buffer_head *ref_root_bh,
+                                         struct buffer_head *ref_leaf_bh,
+                                         struct ocfs2_alloc_context *meta_ac)
+{
+        int ret;
+        u16 suballoc_bit_start;
+        u32 num_got, new_cpos;
+        u64 blkno;
+        struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
+        struct ocfs2_refcount_block *root_rb =
+                        (struct ocfs2_refcount_block *)ref_root_bh->b_data;
+        struct buffer_head *new_bh = NULL;
+        struct ocfs2_refcount_block *new_rb;
+        struct ocfs2_extent_tree ref_et;
+
+        BUG_ON(!(le32_to_cpu(root_rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL));
+
+        ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
+                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
+                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_claim_metadata(OCFS2_SB(sb), handle, meta_ac, 1,
+                                   &suballoc_bit_start, &num_got,
+                                   &blkno);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        new_bh = sb_getblk(sb, blkno);
+        if (new_bh == NULL) {
+                ret = -EIO;
+                mlog_errno(ret);
+                goto out;
+        }
+        ocfs2_set_new_buffer_uptodate(ci, new_bh);
+
+        ret = ocfs2_journal_access_rb(handle, ci, new_bh,
+                                      OCFS2_JOURNAL_ACCESS_CREATE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        /* Initialize ocfs2_refcount_block. */
+        new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
+        memset(new_rb, 0, sb->s_blocksize);
+        strcpy((void *)new_rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
+        new_rb->rf_suballoc_slot = cpu_to_le16(OCFS2_SB(sb)->slot_num);
+        new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
+        new_rb->rf_fs_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation);
+        new_rb->rf_blkno = cpu_to_le64(blkno);
+        new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr);
+        new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL);
+        new_rb->rf_records.rl_count =
+                                cpu_to_le16(ocfs2_refcount_recs_per_rb(sb));
+        new_rb->rf_generation = root_rb->rf_generation;
+
+        ret = ocfs2_divide_leaf_refcount_block(ref_leaf_bh, new_bh, &new_cpos);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ocfs2_journal_dirty(handle, ref_leaf_bh);
+        ocfs2_journal_dirty(handle, new_bh);
+
+        ocfs2_init_refcount_extent_tree(&ref_et, ci, ref_root_bh);
+
+        mlog(0, "insert new leaf block %llu at %u\n",
+             (unsigned long long)new_bh->b_blocknr, new_cpos);
+
+        /* Insert the new leaf block with the specific offset cpos. */
+        ret = ocfs2_insert_extent(handle, &ref_et, new_cpos, new_bh->b_blocknr,
+                                  1, 0, meta_ac);
+        if (ret)
+                mlog_errno(ret);
+
+out:
+        brelse(new_bh);
+        return ret;
+}
+
+static int ocfs2_expand_refcount_tree(handle_t *handle,
+                                      struct ocfs2_caching_info *ci,
+                                      struct buffer_head *ref_root_bh,
+                                      struct buffer_head *ref_leaf_bh,
+                                      struct ocfs2_alloc_context *meta_ac)
+{
+        int ret;
+        struct buffer_head *expand_bh = NULL;
+
+        if (ref_root_bh == ref_leaf_bh) {
+                /*
+                 * the old root bh hasn't been expanded to a b-tree,
+                 * so expand it first.
+                 */
+                ret = ocfs2_expand_inline_ref_root(handle, ci, ref_root_bh,
+                                                   &expand_bh, meta_ac);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+        } else {
+                expand_bh = ref_leaf_bh;
+                get_bh(expand_bh);
+        }
+
+
+        /* Now add a new refcount block into the tree.*/
+        ret = ocfs2_new_leaf_refcount_block(handle, ci, ref_root_bh,
+                                            expand_bh, meta_ac);
+        if (ret)
+                mlog_errno(ret);
+out:
+        brelse(expand_bh);
+        return ret;
+}
+
+/*
+ * Adjust the extent rec in b-tree representing ref_leaf_bh.
+ *
+ * Only called when we have inserted a new refcount rec at index 0
+ * which means ocfs2_extent_rec.e_cpos may need some change.
+ */
+static int ocfs2_adjust_refcount_rec(handle_t *handle,
+                                     struct ocfs2_caching_info *ci,
+                                     struct buffer_head *ref_root_bh,
+                                     struct buffer_head *ref_leaf_bh,
+                                     struct ocfs2_refcount_rec *rec)
+{
+        int ret = 0, i;
+        u32 new_cpos, old_cpos;
+        struct ocfs2_path *path = NULL;
+        struct ocfs2_extent_tree et;
+        struct ocfs2_refcount_block *rb =
+                (struct ocfs2_refcount_block *)ref_root_bh->b_data;
+        struct ocfs2_extent_list *el;
+
+        if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL))
+                goto out;
+
+        rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
+        old_cpos = le32_to_cpu(rb->rf_cpos);
+        new_cpos = le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK;
+        if (old_cpos <= new_cpos)
+                goto out;
+
+        ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
+
+        path = ocfs2_new_path_from_et(&et);
+        if (!path) {
+                ret = -ENOMEM;
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_find_path(ci, path, old_cpos);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        /*
+         * 2 more credits, one for the leaf refcount block, one for
+         * the extent block contains the extent rec.
+         */
+        ret = ocfs2_extend_trans(handle, handle->h_buffer_credits + 2);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
+                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_journal_access_eb(handle, ci, path_leaf_bh(path),
+                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        /* change the leaf extent block first. */
+        el = path_leaf_el(path);
+
+        for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++)
+                if (le32_to_cpu(el->l_recs[i].e_cpos) == old_cpos)
+                        break;
+
+        BUG_ON(i == le16_to_cpu(el->l_next_free_rec));
+
+        el->l_recs[i].e_cpos = cpu_to_le32(new_cpos);
+
+        /* change the r_cpos in the leaf block. */
+        rb->rf_cpos = cpu_to_le32(new_cpos);
+
+        ocfs2_journal_dirty(handle, path_leaf_bh(path));
+        ocfs2_journal_dirty(handle, ref_leaf_bh);
+
+out:
+        ocfs2_free_path(path);
+        return ret;
+}
+
+static int ocfs2_insert_refcount_rec(handle_t *handle,
+                                     struct ocfs2_caching_info *ci,
+                                     struct buffer_head *ref_root_bh,
+                                     struct buffer_head *ref_leaf_bh,
+                                     struct ocfs2_refcount_rec *rec,
+                                     int index, int merge,
+                                     struct ocfs2_alloc_context *meta_ac)
+{
+        int ret;
+        struct ocfs2_refcount_block *rb =
+                        (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
+        struct ocfs2_refcount_list *rf_list = &rb->rf_records;
+        struct buffer_head *new_bh = NULL;
+
+        BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL);
+
+        if (rf_list->rl_used == rf_list->rl_count) {
+                u64 cpos = le64_to_cpu(rec->r_cpos);
+                u32 len = le32_to_cpu(rec->r_clusters);
+
+                ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh,
+                                                 ref_leaf_bh, meta_ac);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
+                                             cpos, len, NULL, &index,
+                                             &new_bh);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                ref_leaf_bh = new_bh;
+                rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
+                rf_list = &rb->rf_records;
+        }
+
+        ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
+                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        if (index < le16_to_cpu(rf_list->rl_used))
+                memmove(&rf_list->rl_recs[index + 1],
+                        &rf_list->rl_recs[index],
+                        (le16_to_cpu(rf_list->rl_used) - index) *
+                         sizeof(struct ocfs2_refcount_rec));
+
+        mlog(0, "insert refcount record start %llu, len %u, count %u "
+             "to leaf block %llu at index %d\n",
+             (unsigned long long)le64_to_cpu(rec->r_cpos),
+             le32_to_cpu(rec->r_clusters), le32_to_cpu(rec->r_refcount),
+             (unsigned long long)ref_leaf_bh->b_blocknr, index);
+
+        rf_list->rl_recs[index] = *rec;
+
+        le16_add_cpu(&rf_list->rl_used, 1);
+
+        if (merge)
+                ocfs2_refcount_rec_merge(rb, index);
+
+        ret = ocfs2_journal_dirty(handle, ref_leaf_bh);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        if (index == 0) {
+                ret = ocfs2_adjust_refcount_rec(handle, ci,
+                                                ref_root_bh,
+                                                ref_leaf_bh, rec);
+                if (ret)
+                        mlog_errno(ret);
+        }
+out:
+        brelse(new_bh);
+        return ret;
+}
+
+/*
+ * Split the refcount_rec indexed by "index" in ref_leaf_bh.
+ * This is much simple than our b-tree code.
+ * split_rec is the new refcount rec we want to insert.
+ * If split_rec->r_refcount > 0, we are changing the refcount(in case we
+ * increase refcount or decrease a refcount to non-zero).
+ * If split_rec->r_refcount == 0, we are punching a hole in current refcount
+ * rec( in case we decrease a refcount to zero).
+ */
+static int ocfs2_split_refcount_rec(handle_t *handle,
+                                    struct ocfs2_caching_info *ci,
+                                    struct buffer_head *ref_root_bh,
+                                    struct buffer_head *ref_leaf_bh,
+                                    struct ocfs2_refcount_rec *split_rec,
+                                    int index, int merge,
+                                    struct ocfs2_alloc_context *meta_ac,
+                                    struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+        int ret, recs_need;
+        u32 len;
+        struct ocfs2_refcount_block *rb =
+                        (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
+        struct ocfs2_refcount_list *rf_list = &rb->rf_records;
+        struct ocfs2_refcount_rec *orig_rec = &rf_list->rl_recs[index];
+        struct ocfs2_refcount_rec *tail_rec = NULL;
+        struct buffer_head *new_bh = NULL;
+
+        BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL);
+
+        mlog(0, "original r_pos %llu, cluster %u, split %llu, cluster %u\n",
+             le64_to_cpu(orig_rec->r_cpos), le32_to_cpu(orig_rec->r_clusters),
+             le64_to_cpu(split_rec->r_cpos),
+             le32_to_cpu(split_rec->r_clusters));
+
+        /*
+         * If we just need to split the header or tail clusters,
+         * no more recs are needed, just split is OK.
+         * Otherwise we at least need one new recs.
+         */
+        if (!split_rec->r_refcount &&
+            (split_rec->r_cpos == orig_rec->r_cpos ||
+             le64_to_cpu(split_rec->r_cpos) +
+             le32_to_cpu(split_rec->r_clusters) ==
+             le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters)))
+                recs_need = 0;
+        else
+                recs_need = 1;
+
+        /*
+         * We need one more rec if we split in the middle and the new rec have
+         * some refcount in it.
+         */
+        if (split_rec->r_refcount &&
+            (split_rec->r_cpos != orig_rec->r_cpos &&
+             le64_to_cpu(split_rec->r_cpos) +
+             le32_to_cpu(split_rec->r_clusters) !=
+             le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters)))
+                recs_need++;
+
+        /* If the leaf block don't have enough record, expand it. */
+        if (le16_to_cpu(rf_list->rl_used) + recs_need > rf_list->rl_count) {
+                struct ocfs2_refcount_rec tmp_rec;
+                u64 cpos = le64_to_cpu(orig_rec->r_cpos);
+                len = le32_to_cpu(orig_rec->r_clusters);
+                ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh,
+                                                 ref_leaf_bh, meta_ac);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                /*
+                 * We have to re-get it since now cpos may be moved to
+                 * another leaf block.
+                 */
+                ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
+                                             cpos, len, &tmp_rec, &index,
+                                             &new_bh);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                ref_leaf_bh = new_bh;
+                rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
+                rf_list = &rb->rf_records;
+                orig_rec = &rf_list->rl_recs[index];
+        }
+
+        ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
+                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        /*
+         * We have calculated out how many new records we need and store
+         * in recs_need, so spare enough space first by moving the records
+         * after "index" to the end.
+         */
+        if (index != le16_to_cpu(rf_list->rl_used) - 1)
+                memmove(&rf_list->rl_recs[index + 1 + recs_need],
+                        &rf_list->rl_recs[index + 1],
+                        (le16_to_cpu(rf_list->rl_used) - index - 1) *
+                         sizeof(struct ocfs2_refcount_rec));
+
+        len = (le64_to_cpu(orig_rec->r_cpos) +
+              le32_to_cpu(orig_rec->r_clusters)) -
+              (le64_to_cpu(split_rec->r_cpos) +
+              le32_to_cpu(split_rec->r_clusters));
+
+        /*
+         * If we have "len", the we will split in the tail and move it
+         * to the end of the space we have just spared.
+         */
+        if (len) {
+                tail_rec = &rf_list->rl_recs[index + recs_need];
+
+                memcpy(tail_rec, orig_rec, sizeof(struct ocfs2_refcount_rec));
+                le64_add_cpu(&tail_rec->r_cpos,
+                             le32_to_cpu(tail_rec->r_clusters) - len);
+                tail_rec->r_clusters = le32_to_cpu(len);
+        }
+
+        /*
+         * If the split pos isn't the same as the original one, we need to
+         * split in the head.
+         *
+         * Note: We have the chance that split_rec.r_refcount = 0,
+         * recs_need = 0 and len > 0, which means we just cut the head from
+         * the orig_rec and in that case we have done some modification in
+         * orig_rec above, so the check for r_cpos is faked.
+         */
+        if (split_rec->r_cpos != orig_rec->r_cpos && tail_rec != orig_rec) {
+                len = le64_to_cpu(split_rec->r_cpos) -
+                      le64_to_cpu(orig_rec->r_cpos);
+                orig_rec->r_clusters = cpu_to_le32(len);
+                index++;
+        }
+
+        le16_add_cpu(&rf_list->rl_used, recs_need);
+
+        if (split_rec->r_refcount) {
+                rf_list->rl_recs[index] = *split_rec;
+                mlog(0, "insert refcount record start %llu, len %u, count %u "
+                     "to leaf block %llu at index %d\n",
+                     (unsigned long long)le64_to_cpu(split_rec->r_cpos),
+                     le32_to_cpu(split_rec->r_clusters),
+                     le32_to_cpu(split_rec->r_refcount),
+                     (unsigned long long)ref_leaf_bh->b_blocknr, index);
+
+                if (merge)
+                        ocfs2_refcount_rec_merge(rb, index);
+        }
+
+        ret = ocfs2_journal_dirty(handle, ref_leaf_bh);
+        if (ret)
+                mlog_errno(ret);
+
+out:
+        brelse(new_bh);
+        return ret;
+}
+
+static int __ocfs2_increase_refcount(handle_t *handle,
+                                     struct ocfs2_caching_info *ci,
+                                     struct buffer_head *ref_root_bh,
+                                     u64 cpos, u32 len, int merge,
+                                     struct ocfs2_alloc_context *meta_ac,
+                                     struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+        int ret = 0, index;
+        struct buffer_head *ref_leaf_bh = NULL;
+        struct ocfs2_refcount_rec rec;
+        unsigned int set_len = 0;
+
+        mlog(0, "Tree owner %llu, add refcount start %llu, len %u\n",
+             (unsigned long long)ocfs2_metadata_cache_owner(ci),
+             (unsigned long long)cpos, len);
+
+        while (len) {
+                ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
+                                             cpos, len, &rec, &index,
+                                             &ref_leaf_bh);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                set_len = le32_to_cpu(rec.r_clusters);
+
+                /*
+                 * Here we may meet with 3 situations:
+                 *
+                 * 1. If we find an already existing record, and the length
+                 *    is the same, cool, we just need to increase the r_refcount
+                 *    and it is OK.
+                 * 2. If we find a hole, just insert it with r_refcount = 1.
+                 * 3. If we are in the middle of one extent record, split
+                 *    it.
+                 */
+                if (rec.r_refcount && le64_to_cpu(rec.r_cpos) == cpos &&
+                    set_len <= len) {
+                        mlog(0, "increase refcount rec, start %llu, len %u, "
+                             "count %u\n", (unsigned long long)cpos, set_len,
+                             le32_to_cpu(rec.r_refcount));
+                        ret = ocfs2_change_refcount_rec(handle, ci,
+                                                        ref_leaf_bh, index,
+                                                        merge, 1);
+                        if (ret) {
+                                mlog_errno(ret);
+                                goto out;
+                        }
+                } else if (!rec.r_refcount) {
+                        rec.r_refcount = cpu_to_le32(1);
+
+                        mlog(0, "insert refcount rec, start %llu, len %u\n",
+                             (unsigned long long)le64_to_cpu(rec.r_cpos),
+                             set_len);
+                        ret = ocfs2_insert_refcount_rec(handle, ci, ref_root_bh,
+                                                        ref_leaf_bh,
+                                                        &rec, index,
+                                                        merge, meta_ac);
+                        if (ret) {
+                                mlog_errno(ret);
+                                goto out;
+                        }
+                } else  {
+                        set_len = min((u64)(cpos + len),
+                                      le64_to_cpu(rec.r_cpos) + set_len) - cpos;
+                        rec.r_cpos = cpu_to_le64(cpos);
+                        rec.r_clusters = cpu_to_le32(set_len);
+                        le32_add_cpu(&rec.r_refcount, 1);
+
+                        mlog(0, "split refcount rec, start %llu, "
+                             "len %u, count %u\n",
+                             (unsigned long long)le64_to_cpu(rec.r_cpos),
+                             set_len, le32_to_cpu(rec.r_refcount));
+                        ret = ocfs2_split_refcount_rec(handle, ci,
+                                                       ref_root_bh, ref_leaf_bh,
+                                                       &rec, index, merge,
+                                                       meta_ac, dealloc);
+                        if (ret) {
+                                mlog_errno(ret);
+                                goto out;
+                        }
+                }
+
+                cpos += set_len;
+                len -= set_len;
+                brelse(ref_leaf_bh);
+                ref_leaf_bh = NULL;
+        }
+
+out:
+        brelse(ref_leaf_bh);
+        return ret;
+}
+
+static int ocfs2_remove_refcount_extent(handle_t *handle,
+                                struct ocfs2_caching_info *ci,
+                                struct buffer_head *ref_root_bh,
+                                struct buffer_head *ref_leaf_bh,
+                                struct ocfs2_alloc_context *meta_ac,
+                                struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+        int ret;
+        struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
+        struct ocfs2_refcount_block *rb =
+                        (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
+        struct ocfs2_extent_tree et;
+
+        BUG_ON(rb->rf_records.rl_used);
+
+        ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
+        ret = ocfs2_remove_extent(handle, &et, le32_to_cpu(rb->rf_cpos),
+                                  1, meta_ac, dealloc);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ocfs2_remove_from_cache(ci, ref_leaf_bh);
+
+        /*
+         * add the freed block to the dealloc so that it will be freed
+         * when we run dealloc.
+         */
+        ret = ocfs2_cache_block_dealloc(dealloc, EXTENT_ALLOC_SYSTEM_INODE,
+                                        le16_to_cpu(rb->rf_suballoc_slot),
+                                        le64_to_cpu(rb->rf_blkno),
+                                        le16_to_cpu(rb->rf_suballoc_bit));
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
+                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
+
+        le32_add_cpu(&rb->rf_clusters, -1);
+
+        /*
+         * check whether we need to restore the root refcount block if
+         * there is no leaf extent block at atll.
+         */
+        if (!rb->rf_list.l_next_free_rec) {
+                BUG_ON(rb->rf_clusters);
+
+                mlog(0, "reset refcount tree root %llu to be a record block.\n",
+                     (unsigned long long)ref_root_bh->b_blocknr);
+
+                rb->rf_flags = 0;
+                rb->rf_parent = 0;
+                rb->rf_cpos = 0;
+                memset(&rb->rf_records, 0, sb->s_blocksize -
+                       offsetof(struct ocfs2_refcount_block, rf_records));
+                rb->rf_records.rl_count =
+                                cpu_to_le16(ocfs2_refcount_recs_per_rb(sb));
+        }
+
+        ocfs2_journal_dirty(handle, ref_root_bh);
+
+out:
+        return ret;
+}
+
+int ocfs2_increase_refcount(handle_t *handle,
+                            struct ocfs2_caching_info *ci,
+                            struct buffer_head *ref_root_bh,
+                            u64 cpos, u32 len,
+                            struct ocfs2_alloc_context *meta_ac,
+                            struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+        return __ocfs2_increase_refcount(handle, ci, ref_root_bh,
+                                         cpos, len, 1,
+                                         meta_ac, dealloc);
+}
+
+static int ocfs2_decrease_refcount_rec(handle_t *handle,
+                                struct ocfs2_caching_info *ci,
+                                struct buffer_head *ref_root_bh,
+                                struct buffer_head *ref_leaf_bh,
+                                int index, u64 cpos, unsigned int len,
+                                struct ocfs2_alloc_context *meta_ac,
+                                struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+        int ret;
+        struct ocfs2_refcount_block *rb =
+                        (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
+        struct ocfs2_refcount_rec *rec = &rb->rf_records.rl_recs[index];
+
+        BUG_ON(cpos < le64_to_cpu(rec->r_cpos));
+        BUG_ON(cpos + len >
+               le64_to_cpu(rec->r_cpos) + le32_to_cpu(rec->r_clusters));
+
+        if (cpos == le64_to_cpu(rec->r_cpos) &&
+            len == le32_to_cpu(rec->r_clusters))
+                ret = ocfs2_change_refcount_rec(handle, ci,
+                                                ref_leaf_bh, index, 1, -1);
+        else {
+                struct ocfs2_refcount_rec split = *rec;
+                split.r_cpos = cpu_to_le64(cpos);
+                split.r_clusters = cpu_to_le32(len);
+
+                le32_add_cpu(&split.r_refcount, -1);
+
+                mlog(0, "split refcount rec, start %llu, "
+                     "len %u, count %u, original start %llu, len %u\n",
+                     (unsigned long long)le64_to_cpu(split.r_cpos),
+                     len, le32_to_cpu(split.r_refcount),
+                     (unsigned long long)le64_to_cpu(rec->r_cpos),
+                     le32_to_cpu(rec->r_clusters));
+                ret = ocfs2_split_refcount_rec(handle, ci,
+                                               ref_root_bh, ref_leaf_bh,
+                                               &split, index, 1,
+                                               meta_ac, dealloc);
+        }
+
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        /* Remove the leaf refcount block if it contains no refcount record. */
+        if (!rb->rf_records.rl_used && ref_leaf_bh != ref_root_bh) {
+                ret = ocfs2_remove_refcount_extent(handle, ci, ref_root_bh,
+                                                   ref_leaf_bh, meta_ac,
+                                                   dealloc);
+                if (ret)
+                        mlog_errno(ret);
+        }
+
+out:
+        return ret;
+}
+
+static int __ocfs2_decrease_refcount(handle_t *handle,
+                                     struct ocfs2_caching_info *ci,
+                                     struct buffer_head *ref_root_bh,
+                                     u64 cpos, u32 len,
+                                     struct ocfs2_alloc_context *meta_ac,
+                                     struct ocfs2_cached_dealloc_ctxt *dealloc,
+                                     int delete)
+{
+        int ret = 0, index = 0;
+        struct ocfs2_refcount_rec rec;
+        unsigned int r_count = 0, r_len;
+        struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
+        struct buffer_head *ref_leaf_bh = NULL;
+
+        mlog(0, "Tree owner %llu, decrease refcount start %llu, "
+             "len %u, delete %u\n",
+             (unsigned long long)ocfs2_metadata_cache_owner(ci),
+             (unsigned long long)cpos, len, delete);
+
+        while (len) {
+                ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
+                                             cpos, len, &rec, &index,
+                                             &ref_leaf_bh);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                r_count = le32_to_cpu(rec.r_refcount);
+                BUG_ON(r_count == 0);
+                if (!delete)
+                        BUG_ON(r_count > 1);
+
+                r_len = min((u64)(cpos + len), le64_to_cpu(rec.r_cpos) +
+                              le32_to_cpu(rec.r_clusters)) - cpos;
+
+                ret = ocfs2_decrease_refcount_rec(handle, ci, ref_root_bh,
+                                                  ref_leaf_bh, index,
+                                                  cpos, r_len,
+                                                  meta_ac, dealloc);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                if (le32_to_cpu(rec.r_refcount) == 1 && delete) {
+                        ret = ocfs2_cache_cluster_dealloc(dealloc,
+                                          ocfs2_clusters_to_blocks(sb, cpos),
+                                                          r_len);
+                        if (ret) {
+                                mlog_errno(ret);
+                                goto out;
+                        }
+                }
+
+                cpos += r_len;
+                len -= r_len;
+                brelse(ref_leaf_bh);
+                ref_leaf_bh = NULL;
+        }
+
+out:
+        brelse(ref_leaf_bh);
+        return ret;
+}
+
+/* Caller must hold refcount tree lock. */
+int ocfs2_decrease_refcount(struct inode *inode,
+                            handle_t *handle, u32 cpos, u32 len,
+                            struct ocfs2_alloc_context *meta_ac,
+                            struct ocfs2_cached_dealloc_ctxt *dealloc,
+                            int delete)
+{
+        int ret;
+        u64 ref_blkno;
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct buffer_head *ref_root_bh = NULL;
+        struct ocfs2_refcount_tree *tree;
+
+        BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
+
+        ret = ocfs2_get_refcount_block(inode, &ref_blkno);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb), ref_blkno, &tree);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno,
+                                        &ref_root_bh);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = __ocfs2_decrease_refcount(handle, &tree->rf_ci, ref_root_bh,
+                                        cpos, len, meta_ac, dealloc, delete);
+        if (ret)
+                mlog_errno(ret);
+out:
+        brelse(ref_root_bh);
+        return ret;
+}
+
+/*
+ * Mark the already-existing extent at cpos as refcounted for len clusters.
+ * This adds the refcount extent flag.
+ *
+ * If the existing extent is larger than the request, initiate a
+ * split. An attempt will be made at merging with adjacent extents.
+ *
+ * The caller is responsible for passing down meta_ac if we'll need it.
+ */
+static int ocfs2_mark_extent_refcounted(struct inode *inode,
+                                struct ocfs2_extent_tree *et,
+                                handle_t *handle, u32 cpos,
+                                u32 len, u32 phys,
+                                struct ocfs2_alloc_context *meta_ac,
+                                struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+        int ret;
+
+        mlog(0, "Inode %lu refcount tree cpos %u, len %u, phys cluster %u\n",
+             inode->i_ino, cpos, len, phys);
+
+        if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
+                ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "
+                            "tree, but the feature bit is not set in the "
+                            "super block.", inode->i_ino);
+                ret = -EROFS;
+                goto out;
+        }
+
+        ret = ocfs2_change_extent_flag(handle, et, cpos,
+                                       len, phys, meta_ac, dealloc,
+                                       OCFS2_EXT_REFCOUNTED, 0);
+        if (ret)
+                mlog_errno(ret);
+
+out:
+        return ret;
+}
+
+/*
+ * Given some contiguous physical clusters, calculate what we need
+ * for modifying their refcount.
+ */
+static int ocfs2_calc_refcount_meta_credits(struct super_block *sb,
+                                            struct ocfs2_caching_info *ci,
+                                            struct buffer_head *ref_root_bh,
+                                            u64 start_cpos,
+                                            u32 clusters,
+                                            int *meta_add,
+                                            int *credits)
+{
+        int ret = 0, index, ref_blocks = 0, recs_add = 0;
+        u64 cpos = start_cpos;
+        struct ocfs2_refcount_block *rb;
+        struct ocfs2_refcount_rec rec;
+        struct buffer_head *ref_leaf_bh = NULL, *prev_bh = NULL;
+        u32 len;
+
+        mlog(0, "start_cpos %llu, clusters %u\n",
+             (unsigned long long)start_cpos, clusters);
+        while (clusters) {
+                ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
+                                             cpos, clusters, &rec,
+                                             &index, &ref_leaf_bh);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                if (ref_leaf_bh != prev_bh) {
+                        /*
+                         * Now we encounter a new leaf block, so calculate
+                         * whether we need to extend the old leaf.
+                         */
+                        if (prev_bh) {
+                                rb = (struct ocfs2_refcount_block *)
+                                                        prev_bh->b_data;
+
+                                if (le64_to_cpu(rb->rf_records.rl_used) +
+                                    recs_add >
+                                    le16_to_cpu(rb->rf_records.rl_count))
+                                        ref_blocks++;
+                        }
+
+                        recs_add = 0;
+                        *credits += 1;
+                        brelse(prev_bh);
+                        prev_bh = ref_leaf_bh;
+                        get_bh(prev_bh);
+                }
+
+                rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
+
+                mlog(0, "recs_add %d,cpos %llu, clusters %u, rec->r_cpos %llu,"
+                     "rec->r_clusters %u, rec->r_refcount %u, index %d\n",
+                     recs_add, (unsigned long long)cpos, clusters,
+                     (unsigned long long)le64_to_cpu(rec.r_cpos),
+                     le32_to_cpu(rec.r_clusters),
+                     le32_to_cpu(rec.r_refcount), index);
+
+                len = min((u64)cpos + clusters, le64_to_cpu(rec.r_cpos) +
+                          le32_to_cpu(rec.r_clusters)) - cpos;
+                /*
+                 * If the refcount rec already exist, cool. We just need
+                 * to check whether there is a split. Otherwise we just need
+                 * to increase the refcount.
+                 * If we will insert one, increases recs_add.
+                 *
+                 * We record all the records which will be inserted to the
+                 * same refcount block, so that we can tell exactly whether
+                 * we need a new refcount block or not.
+                 */
+                if (rec.r_refcount) {
+                        /* Check whether we need a split at the beginning. */
+                        if (cpos == start_cpos &&
+                            cpos != le64_to_cpu(rec.r_cpos))
+                                recs_add++;
+
+                        /* Check whether we need a split in the end. */
+                        if (cpos + clusters < le64_to_cpu(rec.r_cpos) +
+                            le32_to_cpu(rec.r_clusters))
+                                recs_add++;
+                } else
+                        recs_add++;
+
+                brelse(ref_leaf_bh);
+                ref_leaf_bh = NULL;
+                clusters -= len;
+                cpos += len;
+        }
+
+        if (prev_bh) {
+                rb = (struct ocfs2_refcount_block *)prev_bh->b_data;
+
+                if (le64_to_cpu(rb->rf_records.rl_used) + recs_add >
+                    le16_to_cpu(rb->rf_records.rl_count))
+                        ref_blocks++;
+
+                *credits += 1;
+        }
+
+        if (!ref_blocks)
+                goto out;
+
+        mlog(0, "we need ref_blocks %d\n", ref_blocks);
+        *meta_add += ref_blocks;
+        *credits += ref_blocks;
+
+        /*
+         * So we may need ref_blocks to insert into the tree.
+         * That also means we need to change the b-tree and add that number
+         * of records since we never merge them.
+         * We need one more block for expansion since the new created leaf
+         * block is also full and needs split.
+         */
+        rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
+        if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL) {
+                struct ocfs2_extent_tree et;
+
+                ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
+                *meta_add += ocfs2_extend_meta_needed(et.et_root_el);
+                *credits += ocfs2_calc_extend_credits(sb,
+                                                      et.et_root_el,
+                                                      ref_blocks);
+        } else {
+                *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
+                *meta_add += 1;
+        }
+
+out:
+        brelse(ref_leaf_bh);
+        brelse(prev_bh);
+        return ret;
+}
+
+/*
+ * For refcount tree, we will decrease some contiguous clusters
+ * refcount count, so just go through it to see how many blocks
+ * we gonna touch and whether we need to create new blocks.
+ *
+ * Normally the refcount blocks store these refcount should be
+ * continguous also, so that we can get the number easily.
+ * As for meta_ac, we will at most add split 2 refcount record and
+ * 2 more refcount block, so just check it in a rough way.
+ *
+ * Caller must hold refcount tree lock.
+ */
+int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
+                                          struct buffer_head *di_bh,
+                                          u64 phys_blkno,
+                                          u32 clusters,
+                                          int *credits,
+                                          struct ocfs2_alloc_context **meta_ac)
+{
+        int ret, ref_blocks = 0;
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct buffer_head *ref_root_bh = NULL;
+        struct ocfs2_refcount_tree *tree;
+        u64 start_cpos = ocfs2_blocks_to_clusters(inode->i_sb, phys_blkno);
+
+        if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
+                ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "
+                            "tree, but the feature bit is not set in the "
+                            "super block.", inode->i_ino);
+                ret = -EROFS;
+                goto out;
+        }
+
+        BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
+
+        ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb),
+                                      le64_to_cpu(di->i_refcount_loc), &tree);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_read_refcount_block(&tree->rf_ci,
+                                        le64_to_cpu(di->i_refcount_loc),
+                                        &ref_root_bh);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_calc_refcount_meta_credits(inode->i_sb,
+                                               &tree->rf_ci,
+                                               ref_root_bh,
+                                               start_cpos, clusters,
+                                               &ref_blocks, credits);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        mlog(0, "reserve new metadata %d, credits = %d\n",
+             ref_blocks, *credits);
+
+        if (ref_blocks) {
+                ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
+                                                        ref_blocks, meta_ac);
+                if (ret)
+                        mlog_errno(ret);
+        }
+
+out:
+        brelse(ref_root_bh);
+        return ret;
+}
+
+#define MAX_CONTIG_BYTES        1048576
+
+static inline unsigned int ocfs2_cow_contig_clusters(struct super_block *sb)
+{
+        return ocfs2_clusters_for_bytes(sb, MAX_CONTIG_BYTES);
+}
+
+static inline unsigned int ocfs2_cow_contig_mask(struct super_block *sb)
+{
+        return ~(ocfs2_cow_contig_clusters(sb) - 1);
+}
+
+/*
+ * Given an extent that starts at 'start' and an I/O that starts at 'cpos',
+ * find an offset (start + (n * contig_clusters)) that is closest to cpos
+ * while still being less than or equal to it.
+ *
+ * The goal is to break the extent at a multiple of contig_clusters.
+ */
+static inline unsigned int ocfs2_cow_align_start(struct super_block *sb,
+                                                 unsigned int start,
+                                                 unsigned int cpos)
+{
+        BUG_ON(start > cpos);
+
+        return start + ((cpos - start) & ocfs2_cow_contig_mask(sb));
+}
+
+/*
+ * Given a cluster count of len, pad it out so that it is a multiple
+ * of contig_clusters.
+ */
+static inline unsigned int ocfs2_cow_align_length(struct super_block *sb,
+                                                  unsigned int len)
+{
+        unsigned int padded =
+                (len + (ocfs2_cow_contig_clusters(sb) - 1)) &
+                ocfs2_cow_contig_mask(sb);
+
+        /* Did we wrap? */
+        if (padded < len)
+                padded = UINT_MAX;
+
+        return padded;
+}
+
+/*
+ * Calculate out the start and number of virtual clusters we need to to CoW.
+ *
+ * cpos is vitual start cluster position we want to do CoW in a
+ * file and write_len is the cluster length.
+ * max_cpos is the place where we want to stop CoW intentionally.
+ *
+ * Normal we will start CoW from the beginning of extent record cotaining cpos.
+ * We try to break up extents on boundaries of MAX_CONTIG_BYTES so that we
+ * get good I/O from the resulting extent tree.
+ */
+static int ocfs2_refcount_cal_cow_clusters(struct inode *inode,
+                                           struct ocfs2_extent_list *el,
+                                           u32 cpos,
+                                           u32 write_len,
+                                           u32 max_cpos,
+                                           u32 *cow_start,
+                                           u32 *cow_len)
+{
+        int ret = 0;
+        int tree_height = le16_to_cpu(el->l_tree_depth), i;
+        struct buffer_head *eb_bh = NULL;
+        struct ocfs2_extent_block *eb = NULL;
+        struct ocfs2_extent_rec *rec;
+        unsigned int want_clusters, rec_end = 0;
+        int contig_clusters = ocfs2_cow_contig_clusters(inode->i_sb);
+        int leaf_clusters;
+
+        BUG_ON(cpos + write_len > max_cpos);
+
+        if (tree_height > 0) {
+                ret = ocfs2_find_leaf(INODE_CACHE(inode), el, cpos, &eb_bh);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                eb = (struct ocfs2_extent_block *) eb_bh->b_data;
+                el = &eb->h_list;
+
+                if (el->l_tree_depth) {
+                        ocfs2_error(inode->i_sb,
+                                    "Inode %lu has non zero tree depth in "
+                                    "leaf block %llu\n", inode->i_ino,
+                                    (unsigned long long)eb_bh->b_blocknr);
+                        ret = -EROFS;
+                        goto out;
+                }
+        }
+
+        *cow_len = 0;
+        for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
+                rec = &el->l_recs[i];
+
+                if (ocfs2_is_empty_extent(rec)) {
+                        mlog_bug_on_msg(i != 0, "Inode %lu has empty record in "
+                                        "index %d\n", inode->i_ino, i);
+                        continue;
+                }
+
+                if (le32_to_cpu(rec->e_cpos) +
+                    le16_to_cpu(rec->e_leaf_clusters) <= cpos)
+                        continue;
+
+                if (*cow_len == 0) {
+                        /*
+                         * We should find a refcounted record in the
+                         * first pass.
+                         */
+                        BUG_ON(!(rec->e_flags & OCFS2_EXT_REFCOUNTED));
+                        *cow_start = le32_to_cpu(rec->e_cpos);
+                }
+
+                /*
+                 * If we encounter a hole, a non-refcounted record or
+                 * pass the max_cpos, stop the search.
+                 */
+                if ((!(rec->e_flags & OCFS2_EXT_REFCOUNTED)) ||
+                    (*cow_len && rec_end != le32_to_cpu(rec->e_cpos)) ||
+                    (max_cpos <= le32_to_cpu(rec->e_cpos)))
+                        break;
+
+                leaf_clusters = le16_to_cpu(rec->e_leaf_clusters);
+                rec_end = le32_to_cpu(rec->e_cpos) + leaf_clusters;
+                if (rec_end > max_cpos) {
+                        rec_end = max_cpos;
+                        leaf_clusters = rec_end - le32_to_cpu(rec->e_cpos);
+                }
+
+                /*
+                 * How many clusters do we actually need from
+                 * this extent?  First we see how many we actually
+                 * need to complete the write.  If that's smaller
+                 * than contig_clusters, we try for contig_clusters.
+                 */
+                if (!*cow_len)
+                        want_clusters = write_len;
+                else
+                        want_clusters = (cpos + write_len) -
+                                (*cow_start + *cow_len);
+                if (want_clusters < contig_clusters)
+                        want_clusters = contig_clusters;
+
+                /*
+                 * If the write does not cover the whole extent, we
+                 * need to calculate how we're going to split the extent.
+                 * We try to do it on contig_clusters boundaries.
+                 *
+                 * Any extent smaller than contig_clusters will be
+                 * CoWed in its entirety.
+                 */
+                if (leaf_clusters <= contig_clusters)
+                        *cow_len += leaf_clusters;
+                else if (*cow_len || (*cow_start == cpos)) {
+                        /*
+                         * This extent needs to be CoW'd from its
+                         * beginning, so all we have to do is compute
+                         * how many clusters to grab.  We align
+                         * want_clusters to the edge of contig_clusters
+                         * to get better I/O.
+                         */
+                        want_clusters = ocfs2_cow_align_length(inode->i_sb,
+                                                               want_clusters);
+
+                        if (leaf_clusters < want_clusters)
+                                *cow_len += leaf_clusters;
+                        else
+                                *cow_len += want_clusters;
+                } else if ((*cow_start + contig_clusters) >=
+                           (cpos + write_len)) {
+                        /*
+                         * Breaking off contig_clusters at the front
+                         * of the extent will cover our write.  That's
+                         * easy.
+                         */
+                        *cow_len = contig_clusters;
+                } else if ((rec_end - cpos) <= contig_clusters) {
+                        /*
+                         * Breaking off contig_clusters at the tail of
+                         * this extent will cover cpos.
+                         */
+                        *cow_start = rec_end - contig_clusters;
+                        *cow_len = contig_clusters;
+                } else if ((rec_end - cpos) <= want_clusters) {
+                        /*
+                         * While we can't fit the entire write in this
+                         * extent, we know that the write goes from cpos
+                         * to the end of the extent.  Break that off.
+                         * We try to break it at some multiple of
+                         * contig_clusters from the front of the extent.
+                         * Failing that (ie, cpos is within
+                         * contig_clusters of the front), we'll CoW the
+                         * entire extent.
+                         */
+                        *cow_start = ocfs2_cow_align_start(inode->i_sb,
+                                                           *cow_start, cpos);
+                        *cow_len = rec_end - *cow_start;
+                } else {
+                        /*
+                         * Ok, the entire write lives in the middle of
+                         * this extent.  Let's try to slice the extent up
+                         * nicely.  Optimally, our CoW region starts at
+                         * m*contig_clusters from the beginning of the
+                         * extent and goes for n*contig_clusters,
+                         * covering the entire write.
+                         */
+                        *cow_start = ocfs2_cow_align_start(inode->i_sb,
+                                                           *cow_start, cpos);
+
+                        want_clusters = (cpos + write_len) - *cow_start;
+                        want_clusters = ocfs2_cow_align_length(inode->i_sb,
+                                                               want_clusters);
+                        if (*cow_start + want_clusters <= rec_end)
+                                *cow_len = want_clusters;
+                        else
+                                *cow_len = rec_end - *cow_start;
+                }
+
+                /* Have we covered our entire write yet? */
+                if ((*cow_start + *cow_len) >= (cpos + write_len))
+                        break;
+
+                /*
+                 * If we reach the end of the extent block and don't get enough
+                 * clusters, continue with the next extent block if possible.
+                 */
+                if (i + 1 == le16_to_cpu(el->l_next_free_rec) &&
+                    eb && eb->h_next_leaf_blk) {
+                        brelse(eb_bh);
+                        eb_bh = NULL;
+
+                        ret = ocfs2_read_extent_block(INODE_CACHE(inode),
+                                               le64_to_cpu(eb->h_next_leaf_blk),
+                                               &eb_bh);
+                        if (ret) {
+                                mlog_errno(ret);
+                                goto out;
+                        }
+
+                        eb = (struct ocfs2_extent_block *) eb_bh->b_data;
+                        el = &eb->h_list;
+                        i = -1;
+                }
+        }
+
+out:
+        brelse(eb_bh);
+        return ret;
+}
+
+/*
+ * Prepare meta_ac, data_ac and calculate credits when we want to add some
+ * num_clusters in data_tree "et" and change the refcount for the old
+ * clusters(starting form p_cluster) in the refcount tree.
+ *
+ * Note:
+ * 1. since we may split the old tree, so we at most will need num_clusters + 2
+ *    more new leaf records.
+ * 2. In some case, we may not need to reserve new clusters(e.g, reflink), so
+ *    just give data_ac = NULL.
+ */
+static int ocfs2_lock_refcount_allocators(struct super_block *sb,
+                                        u32 p_cluster, u32 num_clusters,
+                                        struct ocfs2_extent_tree *et,
+                                        struct ocfs2_caching_info *ref_ci,
+                                        struct buffer_head *ref_root_bh,
+                                        struct ocfs2_alloc_context **meta_ac,
+                                        struct ocfs2_alloc_context **data_ac,
+                                        int *credits)
+{
+        int ret = 0, meta_add = 0;
+        int num_free_extents = ocfs2_num_free_extents(OCFS2_SB(sb), et);
+
+        if (num_free_extents < 0) {
+                ret = num_free_extents;
+                mlog_errno(ret);
+                goto out;
+        }
+
+        if (num_free_extents < num_clusters + 2)
+                meta_add =
+                        ocfs2_extend_meta_needed(et->et_root_el);
+
+        *credits += ocfs2_calc_extend_credits(sb, et->et_root_el,
+                                              num_clusters + 2);
+
+        ret = ocfs2_calc_refcount_meta_credits(sb, ref_ci, ref_root_bh,
+                                               p_cluster, num_clusters,
+                                               &meta_add, credits);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        mlog(0, "reserve new metadata %d, clusters %u, credits = %d\n",
+             meta_add, num_clusters, *credits);
+        ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(sb), meta_add,
+                                                meta_ac);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        if (data_ac) {
+                ret = ocfs2_reserve_clusters(OCFS2_SB(sb), num_clusters,
+                                             data_ac);
+                if (ret)
+                        mlog_errno(ret);
+        }
+
+out:
+        if (ret) {
+                if (*meta_ac) {
+                        ocfs2_free_alloc_context(*meta_ac);
+                        *meta_ac = NULL;
+                }
+        }
+
+        return ret;
+}
+
+static int ocfs2_clear_cow_buffer(handle_t *handle, struct buffer_head *bh)
+{
+        BUG_ON(buffer_dirty(bh));
+
+        clear_buffer_mapped(bh);
+
+        return 0;
+}
+
+static int ocfs2_duplicate_clusters_by_page(handle_t *handle,
+                                            struct ocfs2_cow_context *context,
+                                            u32 cpos, u32 old_cluster,
+                                            u32 new_cluster, u32 new_len)
+{
+        int ret = 0, partial;
+        struct ocfs2_caching_info *ci = context->data_et.et_ci;
+        struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
+        u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
+        struct page *page;
+        pgoff_t page_index;
+        unsigned int from, to;
+        loff_t offset, end, map_end;
+        struct address_space *mapping = context->inode->i_mapping;
+
+        mlog(0, "old_cluster %u, new %u, len %u at offset %u\n", old_cluster,
+             new_cluster, new_len, cpos);
+
+        offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
+        end = offset + (new_len << OCFS2_SB(sb)->s_clustersize_bits);
+
+        while (offset < end) {
+                page_index = offset >> PAGE_CACHE_SHIFT;
+                map_end = (page_index + 1) << PAGE_CACHE_SHIFT;
+                if (map_end > end)
+                        map_end = end;
+
+                /* from, to is the offset within the page. */
+                from = offset & (PAGE_CACHE_SIZE - 1);
+                to = PAGE_CACHE_SIZE;
+                if (map_end & (PAGE_CACHE_SIZE - 1))
+                        to = map_end & (PAGE_CACHE_SIZE - 1);
+
+                page = grab_cache_page(mapping, page_index);
+
+                /* This page can't be dirtied before we CoW it out. */
+                BUG_ON(PageDirty(page));
+
+                if (!PageUptodate(page)) {
+                        ret = block_read_full_page(page, ocfs2_get_block);
+                        if (ret) {
+                                mlog_errno(ret);
+                                goto unlock;
+                        }
+                        lock_page(page);
+                }
+
+                if (page_has_buffers(page)) {
+                        ret = walk_page_buffers(handle, page_buffers(page),
+                                                from, to, &partial,
+                                                ocfs2_clear_cow_buffer);
+                        if (ret) {
+                                mlog_errno(ret);
+                                goto unlock;
+                        }
+                }
+
+                ocfs2_map_and_dirty_page(context->inode,
+                                         handle, from, to,
+                                         page, 0, &new_block);
+                mark_page_accessed(page);
+unlock:
+                unlock_page(page);
+                page_cache_release(page);
+                page = NULL;
+                offset = map_end;
+                if (ret)
+                        break;
+        }
+
+        return ret;
+}
+
+static int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
+                                           struct ocfs2_cow_context *context,
+                                           u32 cpos, u32 old_cluster,
+                                           u32 new_cluster, u32 new_len)
+{
+        int ret = 0;
+        struct super_block *sb = context->inode->i_sb;
+        struct ocfs2_caching_info *ci = context->data_et.et_ci;
+        int i, blocks = ocfs2_clusters_to_blocks(sb, new_len);
+        u64 old_block = ocfs2_clusters_to_blocks(sb, old_cluster);
+        u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
+        struct ocfs2_super *osb = OCFS2_SB(sb);
+        struct buffer_head *old_bh = NULL;
+        struct buffer_head *new_bh = NULL;
+
+        mlog(0, "old_cluster %u, new %u, len %u\n", old_cluster,
+             new_cluster, new_len);
+
+        for (i = 0; i < blocks; i++, old_block++, new_block++) {
+                new_bh = sb_getblk(osb->sb, new_block);
+                if (new_bh == NULL) {
+                        ret = -EIO;
+                        mlog_errno(ret);
+                        break;
+                }
+
+                ocfs2_set_new_buffer_uptodate(ci, new_bh);
+
+                ret = ocfs2_read_block(ci, old_block, &old_bh, NULL);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+
+                ret = ocfs2_journal_access(handle, ci, new_bh,
+                                           OCFS2_JOURNAL_ACCESS_CREATE);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+
+                memcpy(new_bh->b_data, old_bh->b_data, sb->s_blocksize);
+                ret = ocfs2_journal_dirty(handle, new_bh);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+
+                brelse(new_bh);
+                brelse(old_bh);
+                new_bh = NULL;
+                old_bh = NULL;
+        }
+
+        brelse(new_bh);
+        brelse(old_bh);
+        return ret;
+}
+
+static int ocfs2_clear_ext_refcount(handle_t *handle,
+                                    struct ocfs2_extent_tree *et,
+                                    u32 cpos, u32 p_cluster, u32 len,
+                                    unsigned int ext_flags,
+                                    struct ocfs2_alloc_context *meta_ac,
+                                    struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+        int ret, index;
+        struct ocfs2_extent_rec replace_rec;
+        struct ocfs2_path *path = NULL;
+        struct ocfs2_extent_list *el;
+        struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci);
+        u64 ino = ocfs2_metadata_cache_owner(et->et_ci);
+
+        mlog(0, "inode %llu cpos %u, len %u, p_cluster %u, ext_flags %u\n",
+             (unsigned long long)ino, cpos, len, p_cluster, ext_flags);
+
+        memset(&replace_rec, 0, sizeof(replace_rec));
+        replace_rec.e_cpos = cpu_to_le32(cpos);
+        replace_rec.e_leaf_clusters = cpu_to_le16(len);
+        replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(sb,
+                                                                   p_cluster));
+        replace_rec.e_flags = ext_flags;
+        replace_rec.e_flags &= ~OCFS2_EXT_REFCOUNTED;
+
+        path = ocfs2_new_path_from_et(et);
+        if (!path) {
+                ret = -ENOMEM;
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_find_path(et->et_ci, path, cpos);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        el = path_leaf_el(path);
+
+        index = ocfs2_search_extent_list(el, cpos);
+        if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) {
+                ocfs2_error(sb,
+                            "Inode %llu has an extent at cpos %u which can no "
+                            "longer be found.\n",
+                            (unsigned long long)ino, cpos);
+                ret = -EROFS;
+                goto out;
+        }
+
+        ret = ocfs2_split_extent(handle, et, path, index,
+                                 &replace_rec, meta_ac, dealloc);
+        if (ret)
+                mlog_errno(ret);
+
+out:
+        ocfs2_free_path(path);
+        return ret;
+}
+
+static int ocfs2_replace_clusters(handle_t *handle,
+                                  struct ocfs2_cow_context *context,
+                                  u32 cpos, u32 old,
+                                  u32 new, u32 len,
+                                  unsigned int ext_flags)
+{
+        int ret;
+        struct ocfs2_caching_info *ci = context->data_et.et_ci;
+        u64 ino = ocfs2_metadata_cache_owner(ci);
+
+        mlog(0, "inode %llu, cpos %u, old %u, new %u, len %u, ext_flags %u\n",
+             (unsigned long long)ino, cpos, old, new, len, ext_flags);
+
+        /*If the old clusters is unwritten, no need to duplicate. */
+        if (!(ext_flags & OCFS2_EXT_UNWRITTEN)) {
+                ret = context->cow_duplicate_clusters(handle, context, cpos,
+                                                      old, new, len);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+        }
+
+        ret = ocfs2_clear_ext_refcount(handle, &context->data_et,
+                                       cpos, new, len, ext_flags,
+                                       context->meta_ac, &context->dealloc);
+        if (ret)
+                mlog_errno(ret);
+out:
+        return ret;
+}
+
+static int ocfs2_cow_sync_writeback(struct super_block *sb,
+                                    struct ocfs2_cow_context *context,
+                                    u32 cpos, u32 num_clusters)
+{
+        int ret = 0;
+        loff_t offset, end, map_end;
+        pgoff_t page_index;
+        struct page *page;
+
+        if (ocfs2_should_order_data(context->inode))
+                return 0;
+
+        offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
+        end = offset + (num_clusters << OCFS2_SB(sb)->s_clustersize_bits);
+
+        ret = filemap_fdatawrite_range(context->inode->i_mapping,
+                                       offset, end - 1);
+        if (ret < 0) {
+                mlog_errno(ret);
+                return ret;
+        }
+
+        while (offset < end) {
+                page_index = offset >> PAGE_CACHE_SHIFT;
+                map_end = (page_index + 1) << PAGE_CACHE_SHIFT;
+                if (map_end > end)
+                        map_end = end;
+
+                page = grab_cache_page(context->inode->i_mapping, page_index);
+                BUG_ON(!page);
+
+                wait_on_page_writeback(page);
+                if (PageError(page)) {
+                        ret = -EIO;
+                        mlog_errno(ret);
+                } else
+                        mark_page_accessed(page);
+
+                unlock_page(page);
+                page_cache_release(page);
+                page = NULL;
+                offset = map_end;
+                if (ret)
+                        break;
+        }
+
+        return ret;
+}
+
+static int ocfs2_di_get_clusters(struct ocfs2_cow_context *context,
+                                 u32 v_cluster, u32 *p_cluster,
+                                 u32 *num_clusters,
+                                 unsigned int *extent_flags)
+{
+        return ocfs2_get_clusters(context->inode, v_cluster, p_cluster,
+                                  num_clusters, extent_flags);
+}
+
+static int ocfs2_make_clusters_writable(struct super_block *sb,
+                                        struct ocfs2_cow_context *context,
+                                        u32 cpos, u32 p_cluster,
+                                        u32 num_clusters, unsigned int e_flags)
+{
+        int ret, delete, index, credits =  0;
+        u32 new_bit, new_len;
+        unsigned int set_len;
+        struct ocfs2_super *osb = OCFS2_SB(sb);
+        handle_t *handle;
+        struct buffer_head *ref_leaf_bh = NULL;
+        struct ocfs2_caching_info *ref_ci = &context->ref_tree->rf_ci;
+        struct ocfs2_refcount_rec rec;
+
+        mlog(0, "cpos %u, p_cluster %u, num_clusters %u, e_flags %u\n",
+             cpos, p_cluster, num_clusters, e_flags);
+
+        ret = ocfs2_lock_refcount_allocators(sb, p_cluster, num_clusters,
+                                             &context->data_et,
+                                             ref_ci,
+                                             context->ref_root_bh,
+                                             &context->meta_ac,
+                                             &context->data_ac, &credits);
+        if (ret) {
+                mlog_errno(ret);
+                return ret;
+        }
+
+        if (context->post_refcount)
+                credits += context->post_refcount->credits;
+
+        credits += context->extra_credits;
+        handle = ocfs2_start_trans(osb, credits);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out;
+        }
+
+        while (num_clusters) {
+                ret = ocfs2_get_refcount_rec(ref_ci, context->ref_root_bh,
+                                             p_cluster, num_clusters,
+                                             &rec, &index, &ref_leaf_bh);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out_commit;
+                }
+
+                BUG_ON(!rec.r_refcount);
+                set_len = min((u64)p_cluster + num_clusters,
+                              le64_to_cpu(rec.r_cpos) +
+                              le32_to_cpu(rec.r_clusters)) - p_cluster;
+
+                /*
+                 * There are many different situation here.
+                 * 1. If refcount == 1, remove the flag and don't COW.
+                 * 2. If refcount > 1, allocate clusters.
+                 *    Here we may not allocate r_len once at a time, so continue
+                 *    until we reach num_clusters.
+                 */
+                if (le32_to_cpu(rec.r_refcount) == 1) {
+                        delete = 0;
+                        ret = ocfs2_clear_ext_refcount(handle,
+                                                       &context->data_et,
+                                                       cpos, p_cluster,
+                                                       set_len, e_flags,
+                                                       context->meta_ac,
+                                                       &context->dealloc);
+                        if (ret) {
+                                mlog_errno(ret);
+                                goto out_commit;
+                        }
+                } else {
+                        delete = 1;
+
+                        ret = __ocfs2_claim_clusters(osb, handle,
+                                                     context->data_ac,
+                                                     1, set_len,
+                                                     &new_bit, &new_len);
+                        if (ret) {
+                                mlog_errno(ret);
+                                goto out_commit;
+                        }
+
+                        ret = ocfs2_replace_clusters(handle, context,
+                                                     cpos, p_cluster, new_bit,
+                                                     new_len, e_flags);
+                        if (ret) {
+                                mlog_errno(ret);
+                                goto out_commit;
+                        }
+                        set_len = new_len;
+                }
+
+                ret = __ocfs2_decrease_refcount(handle, ref_ci,
+                                                context->ref_root_bh,
+                                                p_cluster, set_len,
+                                                context->meta_ac,
+                                                &context->dealloc, delete);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out_commit;
+                }
+
+                cpos += set_len;
+                p_cluster += set_len;
+                num_clusters -= set_len;
+                brelse(ref_leaf_bh);
+                ref_leaf_bh = NULL;
+        }
+
+        /* handle any post_cow action. */
+        if (context->post_refcount && context->post_refcount->func) {
+                ret = context->post_refcount->func(context->inode, handle,
+                                                context->post_refcount->para);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out_commit;
+                }
+        }
+
+        /*
+         * Here we should write the new page out first if we are
+         * in write-back mode.
+         */
+        if (context->get_clusters == ocfs2_di_get_clusters) {
+                ret = ocfs2_cow_sync_writeback(sb, context, cpos, num_clusters);
+                if (ret)
+                        mlog_errno(ret);
+        }
+
+out_commit:
+        ocfs2_commit_trans(osb, handle);
+
+out:
+        if (context->data_ac) {
+                ocfs2_free_alloc_context(context->data_ac);
+                context->data_ac = NULL;
+        }
+        if (context->meta_ac) {
+                ocfs2_free_alloc_context(context->meta_ac);
+                context->meta_ac = NULL;
+        }
+        brelse(ref_leaf_bh);
+
+        return ret;
+}
+
+static int ocfs2_replace_cow(struct ocfs2_cow_context *context)
+{
+        int ret = 0;
+        struct inode *inode = context->inode;
+        u32 cow_start = context->cow_start, cow_len = context->cow_len;
+        u32 p_cluster, num_clusters;
+        unsigned int ext_flags;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+        if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
+                ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "
+                            "tree, but the feature bit is not set in the "
+                            "super block.", inode->i_ino);
+                return -EROFS;
+        }
+
+        ocfs2_init_dealloc_ctxt(&context->dealloc);
+
+        while (cow_len) {
+                ret = context->get_clusters(context, cow_start, &p_cluster,
+                                            &num_clusters, &ext_flags);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+
+                BUG_ON(!(ext_flags & OCFS2_EXT_REFCOUNTED));
+
+                if (cow_len < num_clusters)
+                        num_clusters = cow_len;
+
+                ret = ocfs2_make_clusters_writable(inode->i_sb, context,
+                                                   cow_start, p_cluster,
+                                                   num_clusters, ext_flags);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+
+                cow_len -= num_clusters;
+                cow_start += num_clusters;
+        }
+
+        if (ocfs2_dealloc_has_cluster(&context->dealloc)) {
+                ocfs2_schedule_truncate_log_flush(osb, 1);
+                ocfs2_run_deallocs(osb, &context->dealloc);
+        }
+
+        return ret;
+}
+
+/*
+ * Starting at cpos, try to CoW write_len clusters.  Don't CoW
+ * past max_cpos.  This will stop when it runs into a hole or an
+ * unrefcounted extent.
+ */
+static int ocfs2_refcount_cow_hunk(struct inode *inode,
+                                   struct buffer_head *di_bh,
+                                   u32 cpos, u32 write_len, u32 max_cpos)
+{
+        int ret;
+        u32 cow_start = 0, cow_len = 0;
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+        struct buffer_head *ref_root_bh = NULL;
+        struct ocfs2_refcount_tree *ref_tree;
+        struct ocfs2_cow_context *context = NULL;
+
+        BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
+
+        ret = ocfs2_refcount_cal_cow_clusters(inode, &di->id2.i_list,
+                                              cpos, write_len, max_cpos,
+                                              &cow_start, &cow_len);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        mlog(0, "CoW inode %lu, cpos %u, write_len %u, cow_start %u, "
+             "cow_len %u\n", inode->i_ino,
+             cpos, write_len, cow_start, cow_len);
+
+        BUG_ON(cow_len == 0);
+
+        context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS);
+        if (!context) {
+                ret = -ENOMEM;
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
+                                       1, &ref_tree, &ref_root_bh);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        context->inode = inode;
+        context->cow_start = cow_start;
+        context->cow_len = cow_len;
+        context->ref_tree = ref_tree;
+        context->ref_root_bh = ref_root_bh;
+        context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_page;
+        context->get_clusters = ocfs2_di_get_clusters;
+
+        ocfs2_init_dinode_extent_tree(&context->data_et,
+                                      INODE_CACHE(inode), di_bh);
+
+        ret = ocfs2_replace_cow(context);
+        if (ret)
+                mlog_errno(ret);
+
+        /*
+         * truncate the extent map here since no matter whether we meet with
+         * any error during the action, we shouldn't trust cached extent map
+         * any more.
+         */
+        ocfs2_extent_map_trunc(inode, cow_start);
+
+        ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
+        brelse(ref_root_bh);
+out:
+        kfree(context);
+        return ret;
+}
+
+/*
+ * CoW any and all clusters between cpos and cpos+write_len.
+ * Don't CoW past max_cpos.  If this returns successfully, all
+ * clusters between cpos and cpos+write_len are safe to modify.
+ */
+int ocfs2_refcount_cow(struct inode *inode,
+                       struct buffer_head *di_bh,
+                       u32 cpos, u32 write_len, u32 max_cpos)
+{
+        int ret = 0;
+        u32 p_cluster, num_clusters;
+        unsigned int ext_flags;
+
+        while (write_len) {
+                ret = ocfs2_get_clusters(inode, cpos, &p_cluster,
+                                         &num_clusters, &ext_flags);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+
+                if (write_len < num_clusters)
+                        num_clusters = write_len;
+
+                if (ext_flags & OCFS2_EXT_REFCOUNTED) {
+                        ret = ocfs2_refcount_cow_hunk(inode, di_bh, cpos,
+                                                      num_clusters, max_cpos);
+                        if (ret) {
+                                mlog_errno(ret);
+                                break;
+                        }
+                }
+
+                write_len -= num_clusters;
+                cpos += num_clusters;
+        }
+
+        return ret;
+}
+
+static int ocfs2_xattr_value_get_clusters(struct ocfs2_cow_context *context,
+                                          u32 v_cluster, u32 *p_cluster,
+                                          u32 *num_clusters,
+                                          unsigned int *extent_flags)
+{
+        struct inode *inode = context->inode;
+        struct ocfs2_xattr_value_root *xv = context->cow_object;
+
+        return ocfs2_xattr_get_clusters(inode, v_cluster, p_cluster,
+                                        num_clusters, &xv->xr_list,
+                                        extent_flags);
+}
+
+/*
+ * Given a xattr value root, calculate the most meta/credits we need for
+ * refcount tree change if we truncate it to 0.
+ */
+int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
+                                       struct ocfs2_caching_info *ref_ci,
+                                       struct buffer_head *ref_root_bh,
+                                       struct ocfs2_xattr_value_root *xv,
+                                       int *meta_add, int *credits)
+{
+        int ret = 0, index, ref_blocks = 0;
+        u32 p_cluster, num_clusters;
+        u32 cpos = 0, clusters = le32_to_cpu(xv->xr_clusters);
+        struct ocfs2_refcount_block *rb;
+        struct ocfs2_refcount_rec rec;
+        struct buffer_head *ref_leaf_bh = NULL;
+
+        while (cpos < clusters) {
+                ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
+                                               &num_clusters, &xv->xr_list,
+                                               NULL);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                cpos += num_clusters;
+
+                while (num_clusters) {
+                        ret = ocfs2_get_refcount_rec(ref_ci, ref_root_bh,
+                                                     p_cluster, num_clusters,
+                                                     &rec, &index,
+                                                     &ref_leaf_bh);
+                        if (ret) {
+                                mlog_errno(ret);
+                                goto out;
+                        }
+
+                        BUG_ON(!rec.r_refcount);
+
+                        rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
+
+                        /*
+                         * We really don't know whether the other clusters is in
+                         * this refcount block or not, so just take the worst
+                         * case that all the clusters are in this block and each
+                         * one will split a refcount rec, so totally we need
+                         * clusters * 2 new refcount rec.
+                         */
+                        if (le64_to_cpu(rb->rf_records.rl_used) + clusters * 2 >
+                            le16_to_cpu(rb->rf_records.rl_count))
+                                ref_blocks++;
+
+                        *credits += 1;
+                        brelse(ref_leaf_bh);
+                        ref_leaf_bh = NULL;
+
+                        if (num_clusters <= le32_to_cpu(rec.r_clusters))
+                                break;
+                        else
+                                num_clusters -= le32_to_cpu(rec.r_clusters);
+                        p_cluster += num_clusters;
+                }
+        }
+
+        *meta_add += ref_blocks;
+        if (!ref_blocks)
+                goto out;
+
+        rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
+        if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
+                *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
+        else {
+                struct ocfs2_extent_tree et;
+
+                ocfs2_init_refcount_extent_tree(&et, ref_ci, ref_root_bh);
+                *credits += ocfs2_calc_extend_credits(inode->i_sb,
+                                                      et.et_root_el,
+                                                      ref_blocks);
+        }
+
+out:
+        brelse(ref_leaf_bh);
+        return ret;
+}
+
+/*
+ * Do CoW for xattr.
+ */
+int ocfs2_refcount_cow_xattr(struct inode *inode,
+                             struct ocfs2_dinode *di,
+                             struct ocfs2_xattr_value_buf *vb,
+                             struct ocfs2_refcount_tree *ref_tree,
+                             struct buffer_head *ref_root_bh,
+                             u32 cpos, u32 write_len,
+                             struct ocfs2_post_refcount *post)
+{
+        int ret;
+        struct ocfs2_xattr_value_root *xv = vb->vb_xv;
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct ocfs2_cow_context *context = NULL;
+        u32 cow_start, cow_len;
+
+        BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
+
+        ret = ocfs2_refcount_cal_cow_clusters(inode, &xv->xr_list,
+                                              cpos, write_len, UINT_MAX,
+                                              &cow_start, &cow_len);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        BUG_ON(cow_len == 0);
+
+        context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS);
+        if (!context) {
+                ret = -ENOMEM;
+                mlog_errno(ret);
+                goto out;
+        }
+
+        context->inode = inode;
+        context->cow_start = cow_start;
+        context->cow_len = cow_len;
+        context->ref_tree = ref_tree;
+        context->ref_root_bh = ref_root_bh;;
+        context->cow_object = xv;
+
+        context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_jbd;
+        /* We need the extra credits for duplicate_clusters by jbd. */
+        context->extra_credits =
+                ocfs2_clusters_to_blocks(inode->i_sb, 1) * cow_len;
+        context->get_clusters = ocfs2_xattr_value_get_clusters;
+        context->post_refcount = post;
+
+        ocfs2_init_xattr_value_extent_tree(&context->data_et,
+                                           INODE_CACHE(inode), vb);
+
+        ret = ocfs2_replace_cow(context);
+        if (ret)
+                mlog_errno(ret);
+
+out:
+        kfree(context);
+        return ret;
+}
+
+/*
+ * Insert a new extent into refcount tree and mark a extent rec
+ * as refcounted in the dinode tree.
+ */
+int ocfs2_add_refcount_flag(struct inode *inode,
+                            struct ocfs2_extent_tree *data_et,
+                            struct ocfs2_caching_info *ref_ci,
+                            struct buffer_head *ref_root_bh,
+                            u32 cpos, u32 p_cluster, u32 num_clusters,
+                            struct ocfs2_cached_dealloc_ctxt *dealloc,
+                            struct ocfs2_post_refcount *post)
+{
+        int ret;
+        handle_t *handle;
+        int credits = 1, ref_blocks = 0;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_alloc_context *meta_ac = NULL;
+
+        ret = ocfs2_calc_refcount_meta_credits(inode->i_sb,
+                                               ref_ci, ref_root_bh,
+                                               p_cluster, num_clusters,
+                                               &ref_blocks, &credits);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        mlog(0, "reserve new metadata %d, credits = %d\n",
+             ref_blocks, credits);
+
+        if (ref_blocks) {
+                ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
+                                                        ref_blocks, &meta_ac);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+        }
+
+        if (post)
+                credits += post->credits;
+
+        handle = ocfs2_start_trans(osb, credits);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_mark_extent_refcounted(inode, data_et, handle,
+                                           cpos, num_clusters, p_cluster,
+                                           meta_ac, dealloc);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        ret = __ocfs2_increase_refcount(handle, ref_ci, ref_root_bh,
+                                        p_cluster, num_clusters, 0,
+                                        meta_ac, dealloc);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        if (post && post->func) {
+                ret = post->func(inode, handle, post->para);
+                if (ret)
+                        mlog_errno(ret);
+        }
+
+out_commit:
+        ocfs2_commit_trans(osb, handle);
+out:
+        if (meta_ac)
+                ocfs2_free_alloc_context(meta_ac);
+        return ret;
+}
+
+static int ocfs2_change_ctime(struct inode *inode,
+                              struct buffer_head *di_bh)
+{
+        int ret;
+        handle_t *handle;
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+
+        handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
+                                   OCFS2_INODE_UPDATE_CREDITS);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
+                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        inode->i_ctime = CURRENT_TIME;
+        di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
+        di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
+
+        ocfs2_journal_dirty(handle, di_bh);
+
+out_commit:
+        ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
+out:
+        return ret;
+}
+
+static int ocfs2_attach_refcount_tree(struct inode *inode,
+                                      struct buffer_head *di_bh)
+{
+        int ret, data_changed = 0;
+        struct buffer_head *ref_root_bh = NULL;
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_refcount_tree *ref_tree;
+        unsigned int ext_flags;
+        loff_t size;
+        u32 cpos, num_clusters, clusters, p_cluster;
+        struct ocfs2_cached_dealloc_ctxt dealloc;
+        struct ocfs2_extent_tree di_et;
+
+        ocfs2_init_dealloc_ctxt(&dealloc);
+
+        if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)) {
+                ret = ocfs2_create_refcount_tree(inode, di_bh);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+        }
+
+        BUG_ON(!di->i_refcount_loc);
+        ret = ocfs2_lock_refcount_tree(osb,
+                                       le64_to_cpu(di->i_refcount_loc), 1,
+                                       &ref_tree, &ref_root_bh);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ocfs2_init_dinode_extent_tree(&di_et, INODE_CACHE(inode), di_bh);
+
+        size = i_size_read(inode);
+        clusters = ocfs2_clusters_for_bytes(inode->i_sb, size);
+
+        cpos = 0;
+        while (cpos < clusters) {
+                ret = ocfs2_get_clusters(inode, cpos, &p_cluster,
+                                         &num_clusters, &ext_flags);
+
+                if (p_cluster && !(ext_flags & OCFS2_EXT_REFCOUNTED)) {
+                        ret = ocfs2_add_refcount_flag(inode, &di_et,
+                                                      &ref_tree->rf_ci,
+                                                      ref_root_bh, cpos,
+                                                      p_cluster, num_clusters,
+                                                      &dealloc, NULL);
+                        if (ret) {
+                                mlog_errno(ret);
+                                goto unlock;
+                        }
+
+                        data_changed = 1;
+                }
+                cpos += num_clusters;
+        }
+
+        if (oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) {
+                ret = ocfs2_xattr_attach_refcount_tree(inode, di_bh,
+                                                       &ref_tree->rf_ci,
+                                                       ref_root_bh,
+                                                       &dealloc);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto unlock;
+                }
+        }
+
+        if (data_changed) {
+                ret = ocfs2_change_ctime(inode, di_bh);
+                if (ret)
+                        mlog_errno(ret);
+        }
+
+unlock:
+        ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
+        brelse(ref_root_bh);
+
+        if (!ret && ocfs2_dealloc_has_cluster(&dealloc)) {
+                ocfs2_schedule_truncate_log_flush(osb, 1);
+                ocfs2_run_deallocs(osb, &dealloc);
+        }
+out:
+        /*
+         * Empty the extent map so that we may get the right extent
+         * record from the disk.
+         */
+        ocfs2_extent_map_trunc(inode, 0);
+
+        return ret;
+}
+
+static int ocfs2_add_refcounted_extent(struct inode *inode,
+                                   struct ocfs2_extent_tree *et,
+                                   struct ocfs2_caching_info *ref_ci,
+                                   struct buffer_head *ref_root_bh,
+                                   u32 cpos, u32 p_cluster, u32 num_clusters,
+                                   unsigned int ext_flags,
+                                   struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+        int ret;
+        handle_t *handle;
+        int credits = 0;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_alloc_context *meta_ac = NULL;
+
+        ret = ocfs2_lock_refcount_allocators(inode->i_sb,
+                                             p_cluster, num_clusters,
+                                             et, ref_ci,
+                                             ref_root_bh, &meta_ac,
+                                             NULL, &credits);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        handle = ocfs2_start_trans(osb, credits);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_insert_extent(handle, et, cpos,
+                        cpu_to_le64(ocfs2_clusters_to_blocks(inode->i_sb,
+                                                             p_cluster)),
+                        num_clusters, ext_flags, meta_ac);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        ret = ocfs2_increase_refcount(handle, ref_ci, ref_root_bh,
+                                      p_cluster, num_clusters,
+                                      meta_ac, dealloc);
+        if (ret)
+                mlog_errno(ret);
+
+out_commit:
+        ocfs2_commit_trans(osb, handle);
+out:
+        if (meta_ac)
+                ocfs2_free_alloc_context(meta_ac);
+        return ret;
+}
+
+static int ocfs2_duplicate_extent_list(struct inode *s_inode,
+                                struct inode *t_inode,
+                                struct buffer_head *t_bh,
+                                struct ocfs2_caching_info *ref_ci,
+                                struct buffer_head *ref_root_bh,
+                                struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+        int ret = 0;
+        u32 p_cluster, num_clusters, clusters, cpos;
+        loff_t size;
+        unsigned int ext_flags;
+        struct ocfs2_extent_tree et;
+
+        ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(t_inode), t_bh);
+
+        size = i_size_read(s_inode);
+        clusters = ocfs2_clusters_for_bytes(s_inode->i_sb, size);
+
+        cpos = 0;
+        while (cpos < clusters) {
+                ret = ocfs2_get_clusters(s_inode, cpos, &p_cluster,
+                                         &num_clusters, &ext_flags);
+
+                if (p_cluster) {
+                        ret = ocfs2_add_refcounted_extent(t_inode, &et,
+                                                          ref_ci, ref_root_bh,
+                                                          cpos, p_cluster,
+                                                          num_clusters,
+                                                          ext_flags,
+                                                          dealloc);
+                        if (ret) {
+                                mlog_errno(ret);
+                                goto out;
+                        }
+                }
+
+                cpos += num_clusters;
+        }
+
+out:
+        return ret;
+}
+
+/*
+ * change the new file's attributes to the src.
+ *
+ * reflink creates a snapshot of a file, that means the attributes
+ * must be identical except for three exceptions - nlink, ino, and ctime.
+ */
+static int ocfs2_complete_reflink(struct inode *s_inode,
+                                  struct buffer_head *s_bh,
+                                  struct inode *t_inode,
+                                  struct buffer_head *t_bh,
+                                  bool preserve)
+{
+        int ret;
+        handle_t *handle;
+        struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data;
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)t_bh->b_data;
+        loff_t size = i_size_read(s_inode);
+
+        handle = ocfs2_start_trans(OCFS2_SB(t_inode->i_sb),
+                                   OCFS2_INODE_UPDATE_CREDITS);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                return ret;
+        }
+
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh,
+                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        spin_lock(&OCFS2_I(t_inode)->ip_lock);
+        OCFS2_I(t_inode)->ip_clusters = OCFS2_I(s_inode)->ip_clusters;
+        OCFS2_I(t_inode)->ip_attr = OCFS2_I(s_inode)->ip_attr;
+        OCFS2_I(t_inode)->ip_dyn_features = OCFS2_I(s_inode)->ip_dyn_features;
+        spin_unlock(&OCFS2_I(t_inode)->ip_lock);
+        i_size_write(t_inode, size);
+
+        di->i_xattr_inline_size = s_di->i_xattr_inline_size;
+        di->i_clusters = s_di->i_clusters;
+        di->i_size = s_di->i_size;
+        di->i_dyn_features = s_di->i_dyn_features;
+        di->i_attr = s_di->i_attr;
+
+        if (preserve) {
+                di->i_uid = s_di->i_uid;
+                di->i_gid = s_di->i_gid;
+                di->i_mode = s_di->i_mode;
+
+                /*
+                 * update time.
+                 * we want mtime to appear identical to the source and
+                 * update ctime.
+                 */
+                t_inode->i_ctime = CURRENT_TIME;
+
+                di->i_ctime = cpu_to_le64(t_inode->i_ctime.tv_sec);
+                di->i_ctime_nsec = cpu_to_le32(t_inode->i_ctime.tv_nsec);
+
+                t_inode->i_mtime = s_inode->i_mtime;
+                di->i_mtime = s_di->i_mtime;
+                di->i_mtime_nsec = s_di->i_mtime_nsec;
+        }
+
+        ocfs2_journal_dirty(handle, t_bh);
+
+out_commit:
+        ocfs2_commit_trans(OCFS2_SB(t_inode->i_sb), handle);
+        return ret;
+}
+
+static int ocfs2_create_reflink_node(struct inode *s_inode,
+                                     struct buffer_head *s_bh,
+                                     struct inode *t_inode,
+                                     struct buffer_head *t_bh,
+                                     bool preserve)
+{
+        int ret;
+        struct buffer_head *ref_root_bh = NULL;
+        struct ocfs2_cached_dealloc_ctxt dealloc;
+        struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb);
+        struct ocfs2_refcount_block *rb;
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)s_bh->b_data;
+        struct ocfs2_refcount_tree *ref_tree;
+
+        ocfs2_init_dealloc_ctxt(&dealloc);
+
+        ret = ocfs2_set_refcount_tree(t_inode, t_bh,
+                                      le64_to_cpu(di->i_refcount_loc));
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
+                                       1, &ref_tree, &ref_root_bh);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+        rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
+
+        ret = ocfs2_duplicate_extent_list(s_inode, t_inode, t_bh,
+                                          &ref_tree->rf_ci, ref_root_bh,
+                                          &dealloc);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_unlock_refcount;
+        }
+
+        ret = ocfs2_complete_reflink(s_inode, s_bh, t_inode, t_bh, preserve);
+        if (ret)
+                mlog_errno(ret);
+
+out_unlock_refcount:
+        ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
+        brelse(ref_root_bh);
+out:
+        if (ocfs2_dealloc_has_cluster(&dealloc)) {
+                ocfs2_schedule_truncate_log_flush(osb, 1);
+                ocfs2_run_deallocs(osb, &dealloc);
+        }
+
+        return ret;
+}
+
+static int __ocfs2_reflink(struct dentry *old_dentry,
+                           struct buffer_head *old_bh,
+                           struct inode *new_inode,
+                           bool preserve)
+{
+        int ret;
+        struct inode *inode = old_dentry->d_inode;
+        struct buffer_head *new_bh = NULL;
+
+        ret = filemap_fdatawrite(inode->i_mapping);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_attach_refcount_tree(inode, old_bh);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        mutex_lock(&new_inode->i_mutex);
+        ret = ocfs2_inode_lock(new_inode, &new_bh, 1);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_unlock;
+        }
+
+        ret = ocfs2_create_reflink_node(inode, old_bh,
+                                        new_inode, new_bh, preserve);
+        if (ret) {
+                mlog_errno(ret);
+                goto inode_unlock;
+        }
+
+        if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_XATTR_FL) {
+                ret = ocfs2_reflink_xattrs(inode, old_bh,
+                                           new_inode, new_bh,
+                                           preserve);
+                if (ret)
+                        mlog_errno(ret);
+        }
+inode_unlock:
+        ocfs2_inode_unlock(new_inode, 1);
+        brelse(new_bh);
+out_unlock:
+        mutex_unlock(&new_inode->i_mutex);
+out:
+        if (!ret) {
+                ret = filemap_fdatawait(inode->i_mapping);
+                if (ret)
+                        mlog_errno(ret);
+        }
+        return ret;
+}
+
+static int ocfs2_reflink(struct dentry *old_dentry, struct inode *dir,
+                         struct dentry *new_dentry, bool preserve)
+{
+        int error;
+        struct inode *inode = old_dentry->d_inode;
+        struct buffer_head *old_bh = NULL;
+        struct inode *new_orphan_inode = NULL;
+
+        if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)))
+                return -EOPNOTSUPP;
+
+        error = ocfs2_create_inode_in_orphan(dir, inode->i_mode,
+                                             &new_orphan_inode);
+        if (error) {
+                mlog_errno(error);
+                goto out;
+        }
+
+        error = ocfs2_inode_lock(inode, &old_bh, 1);
+        if (error) {
+                mlog_errno(error);
+                goto out;
+        }
+
+        down_write(&OCFS2_I(inode)->ip_xattr_sem);
+        down_write(&OCFS2_I(inode)->ip_alloc_sem);
+        error = __ocfs2_reflink(old_dentry, old_bh,
+                                new_orphan_inode, preserve);
+        up_write(&OCFS2_I(inode)->ip_alloc_sem);
+        up_write(&OCFS2_I(inode)->ip_xattr_sem);
+
+        ocfs2_inode_unlock(inode, 1);
+        brelse(old_bh);
+
+        if (error) {
+                mlog_errno(error);
+                goto out;
+        }
+
+        /* If the security isn't preserved, we need to re-initialize them. */
+        if (!preserve) {
+                error = ocfs2_init_security_and_acl(dir, new_orphan_inode);
+                if (error)
+                        mlog_errno(error);
+        }
+out:
+        if (!error) {
+                error = ocfs2_mv_orphaned_inode_to_new(dir, new_orphan_inode,
+                                                       new_dentry);
+                if (error)
+                        mlog_errno(error);
+        }
+
+        if (new_orphan_inode) {
+                /*
+                 * We need to open_unlock the inode no matter whether we
+                 * succeed or not, so that other nodes can delete it later.
+                 */
+                ocfs2_open_unlock(new_orphan_inode);
+                if (error)
+                        iput(new_orphan_inode);
+        }
+
+        return error;
+}
+
+/*
+ * Below here are the bits used by OCFS2_IOC_REFLINK() to fake
+ * sys_reflink().  This will go away when vfs_reflink() exists in
+ * fs/namei.c.
+ */
+
+/* copied from may_create in VFS. */
+static inline int ocfs2_may_create(struct inode *dir, struct dentry *child)
+{
+        if (child->d_inode)
+                return -EEXIST;
+        if (IS_DEADDIR(dir))
+                return -ENOENT;
+        return inode_permission(dir, MAY_WRITE | MAY_EXEC);
+}
+
+/* copied from user_path_parent. */
+static int ocfs2_user_path_parent(const char __user *path,
+                                  struct nameidata *nd, char **name)
+{
+        char *s = getname(path);
+        int error;
+
+        if (IS_ERR(s))
+                return PTR_ERR(s);
+
+        error = path_lookup(s, LOOKUP_PARENT, nd);
+        if (error)
+                putname(s);
+        else
+                *name = s;
+
+        return error;
+}
+
+/**
+ * ocfs2_vfs_reflink - Create a reference-counted link
+ *
+ * @old_dentry:        source dentry + inode
+ * @dir:       directory to create the target
+ * @new_dentry:        target dentry
+ * @preserve:  if true, preserve all file attributes
+ */
+int ocfs2_vfs_reflink(struct dentry *old_dentry, struct inode *dir,
+                      struct dentry *new_dentry, bool preserve)
+{
+        struct inode *inode = old_dentry->d_inode;
+        int error;
+
+        if (!inode)
+                return -ENOENT;
+
+        error = ocfs2_may_create(dir, new_dentry);
+        if (error)
+                return error;
+
+        if (dir->i_sb != inode->i_sb)
+                return -EXDEV;
+
+        /*
+         * A reflink to an append-only or immutable file cannot be created.
+         */
+        if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
+                return -EPERM;
+
+        /* Only regular files can be reflinked. */
+        if (!S_ISREG(inode->i_mode))
+                return -EPERM;
+
+        /*
+         * If the caller wants to preserve ownership, they require the
+         * rights to do so.
+         */
+        if (preserve) {
+                if ((current_fsuid() != inode->i_uid) && !capable(CAP_CHOWN))
+                        return -EPERM;
+                if (!in_group_p(inode->i_gid) && !capable(CAP_CHOWN))
+                        return -EPERM;
+        }
+
+        /*
+         * If the caller is modifying any aspect of the attributes, they
+         * are not creating a snapshot.  They need read permission on the
+         * file.
+         */
+        if (!preserve) {
+                error = inode_permission(inode, MAY_READ);
+                if (error)
+                        return error;
+        }
+
+        mutex_lock(&inode->i_mutex);
+        vfs_dq_init(dir);
+        error = ocfs2_reflink(old_dentry, dir, new_dentry, preserve);
+        mutex_unlock(&inode->i_mutex);
+        if (!error)
+                fsnotify_create(dir, new_dentry);
+        return error;
+}
+/*
+ * Most codes are copied from sys_linkat.
+ */
+int ocfs2_reflink_ioctl(struct inode *inode,
+                        const char __user *oldname,
+                        const char __user *newname,
+                        bool preserve)
+{
+        struct dentry *new_dentry;
+        struct nameidata nd;
+        struct path old_path;
+        int error;
+        char *to = NULL;
+
+        if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)))
+                return -EOPNOTSUPP;
+
+        error = user_path_at(AT_FDCWD, oldname, 0, &old_path);
+        if (error) {
+                mlog_errno(error);
+                return error;
+        }
+
+        error = ocfs2_user_path_parent(newname, &nd, &to);
+        if (error) {
+                mlog_errno(error);
+                goto out;
+        }
+
+        error = -EXDEV;
+        if (old_path.mnt != nd.path.mnt)
+                goto out_release;
+        new_dentry = lookup_create(&nd, 0);
+        error = PTR_ERR(new_dentry);
+        if (IS_ERR(new_dentry)) {
+                mlog_errno(error);
+                goto out_unlock;
+        }
+
+        error = mnt_want_write(nd.path.mnt);
+        if (error) {
+                mlog_errno(error);
+                goto out_dput;
+        }
+
+        error = ocfs2_vfs_reflink(old_path.dentry,
+                                  nd.path.dentry->d_inode,
+                                  new_dentry, preserve);
+        mnt_drop_write(nd.path.mnt);
+out_dput:
+        dput(new_dentry);
+out_unlock:
+        mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
+out_release:
+        path_put(&nd.path);
+        putname(to);
+out:
+        path_put(&old_path);
+
+        return error;
+}
diff --git a/fs/ocfs2/refcounttree.h b/fs/ocfs2/refcounttree.h
new file mode 100644
index 000000000000..c1d19b1d3ecc
--- /dev/null
+++ b/fs/ocfs2/refcounttree.h
@@ -0,0 +1,106 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * refcounttree.h
+ *
+ * Copyright (C) 2009 Oracle.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+#ifndef OCFS2_REFCOUNTTREE_H
+#define OCFS2_REFCOUNTTREE_H
+
+struct ocfs2_refcount_tree {
+        struct rb_node rf_node;
+        u64 rf_blkno;
+        u32 rf_generation;
+        struct rw_semaphore rf_sem;
+        struct ocfs2_lock_res rf_lockres;
+        struct kref rf_getcnt;
+        int rf_removed;
+
+        /* the following 4 fields are used by caching_info. */
+        struct ocfs2_caching_info rf_ci;
+        spinlock_t rf_lock;
+        struct mutex rf_io_mutex;
+        struct super_block *rf_sb;
+};
+
+void ocfs2_purge_refcount_trees(struct ocfs2_super *osb);
+int ocfs2_lock_refcount_tree(struct ocfs2_super *osb, u64 ref_blkno, int rw,
+                             struct ocfs2_refcount_tree **tree,
+                             struct buffer_head **ref_bh);
+void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
+                                struct ocfs2_refcount_tree *tree,
+                                int rw);
+
+int ocfs2_decrease_refcount(struct inode *inode,
+                            handle_t *handle, u32 cpos, u32 len,
+                            struct ocfs2_alloc_context *meta_ac,
+                            struct ocfs2_cached_dealloc_ctxt *dealloc,
+                            int delete);
+int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
+                                          struct buffer_head *di_bh,
+                                          u64 phys_blkno,
+                                          u32 clusters,
+                                          int *credits,
+                                          struct ocfs2_alloc_context **meta_ac);
+int ocfs2_refcount_cow(struct inode *inode, struct buffer_head *di_bh,
+                       u32 cpos, u32 write_len, u32 max_cpos);
+
+typedef int (ocfs2_post_refcount_func)(struct inode *inode,
+                                       handle_t *handle,
+                                       void *para);
+/*
+ * Some refcount caller need to do more work after we modify the data b-tree
+ * during refcount operation(including CoW and add refcount flag), and make the
+ * transaction complete. So it must give us this structure so that we can do it
+ * within our transaction.
+ *
+ */
+struct ocfs2_post_refcount {
+        int credits;                    /* credits it need for journal. */
+        ocfs2_post_refcount_func *func; /* real function. */
+        void *para;
+};
+
+int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
+                                       struct ocfs2_caching_info *ref_ci,
+                                       struct buffer_head *ref_root_bh,
+                                       struct ocfs2_xattr_value_root *xv,
+                                       int *meta_add, int *credits);
+int ocfs2_refcount_cow_xattr(struct inode *inode,
+                             struct ocfs2_dinode *di,
+                             struct ocfs2_xattr_value_buf *vb,
+                             struct ocfs2_refcount_tree *ref_tree,
+                             struct buffer_head *ref_root_bh,
+                             u32 cpos, u32 write_len,
+                             struct ocfs2_post_refcount *post);
+int ocfs2_add_refcount_flag(struct inode *inode,
+                            struct ocfs2_extent_tree *data_et,
+                            struct ocfs2_caching_info *ref_ci,
+                            struct buffer_head *ref_root_bh,
+                            u32 cpos, u32 p_cluster, u32 num_clusters,
+                            struct ocfs2_cached_dealloc_ctxt *dealloc,
+                            struct ocfs2_post_refcount *post);
+int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
+int ocfs2_try_remove_refcount_tree(struct inode *inode,
+                                   struct buffer_head *di_bh);
+int ocfs2_increase_refcount(handle_t *handle,
+                            struct ocfs2_caching_info *ci,
+                            struct buffer_head *ref_root_bh,
+                            u64 cpos, u32 len,
+                            struct ocfs2_alloc_context *meta_ac,
+                            struct ocfs2_cached_dealloc_ctxt *dealloc);
+int ocfs2_reflink_ioctl(struct inode *inode,
+                        const char __user *oldname,
+                        const char __user *newname,
+                        bool preserve);
+#endif /* OCFS2_REFCOUNTTREE_H */
diff --git a/fs/ocfs2/resize.c b/fs/ocfs2/resize.c
index 424adaa5f900..3c3d673a4d20 100644
--- a/fs/ocfs2/resize.c
+++ b/fs/ocfs2/resize.c
@@ -106,8 +106,8 @@ static int ocfs2_update_last_group_and_inode(handle_t *handle,
         mlog_entry("(new_clusters=%d, first_new_cluster = %u)\n",
                    new_clusters, first_new_cluster);
 
-        ret = ocfs2_journal_access_gd(handle, bm_inode, group_bh,
-                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        ret = ocfs2_journal_access_gd(handle, INODE_CACHE(bm_inode),
+                                      group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret < 0) {
                 mlog_errno(ret);
                 goto out;
@@ -141,7 +141,7 @@ static int ocfs2_update_last_group_and_inode(handle_t *handle,
         }
 
         /* update the inode accordingly. */
-        ret = ocfs2_journal_access_di(handle, bm_inode, bm_bh,
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(bm_inode), bm_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret < 0) {
                 mlog_errno(ret);
@@ -514,7 +514,7 @@ int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input)
                 goto out_unlock;
         }
 
-        ocfs2_set_new_buffer_uptodate(inode, group_bh);
+        ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh);
 
         ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh);
         if (ret) {
@@ -536,8 +536,8 @@ int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input)
         cl = &fe->id2.i_chain;
         cr = &cl->cl_recs[input->chain];
 
-        ret = ocfs2_journal_access_gd(handle, main_bm_inode, group_bh,
-                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode),
+                                      group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret < 0) {
                 mlog_errno(ret);
                 goto out_commit;
@@ -552,8 +552,8 @@ int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input)
                 goto out_commit;
         }
 
-        ret = ocfs2_journal_access_di(handle, main_bm_inode, main_bm_bh,
-                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode),
+                                      main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret < 0) {
                 mlog_errno(ret);
                 goto out_commit;
diff --git a/fs/ocfs2/slot_map.c b/fs/ocfs2/slot_map.c
index 40661e7824e9..bfbd7e9e949f 100644
--- a/fs/ocfs2/slot_map.c
+++ b/fs/ocfs2/slot_map.c
@@ -150,8 +150,8 @@ int ocfs2_refresh_slot_info(struct ocfs2_super *osb)
          * be !NULL.  Thus, ocfs2_read_blocks() will ignore blocknr.  If
          * this is not true, the read of -1 (UINT64_MAX) will fail.
          */
-        ret = ocfs2_read_blocks(si->si_inode, -1, si->si_blocks, si->si_bh,
-                                OCFS2_BH_IGNORE_CACHE, NULL);
+        ret = ocfs2_read_blocks(INODE_CACHE(si->si_inode), -1, si->si_blocks,
+                                si->si_bh, OCFS2_BH_IGNORE_CACHE, NULL);
         if (ret == 0) {
                 spin_lock(&osb->osb_lock);
                 ocfs2_update_slot_info(si);
@@ -213,7 +213,7 @@ static int ocfs2_update_disk_slot(struct ocfs2_super *osb,
                 ocfs2_update_disk_slot_old(si, slot_num, &bh);
         spin_unlock(&osb->osb_lock);
 
-        status = ocfs2_write_block(osb, bh, si->si_inode);
+        status = ocfs2_write_block(osb, bh, INODE_CACHE(si->si_inode));
         if (status < 0)
                 mlog_errno(status);
 
@@ -404,8 +404,8 @@ static int ocfs2_map_slot_buffers(struct ocfs2_super *osb,
                      (unsigned long long)blkno);
 
                 bh = NULL;  /* Acquire a fresh bh */
-                status = ocfs2_read_blocks(si->si_inode, blkno, 1, &bh,
-                                           OCFS2_BH_IGNORE_CACHE, NULL);
+                status = ocfs2_read_blocks(INODE_CACHE(si->si_inode), blkno,
+                                           1, &bh, OCFS2_BH_IGNORE_CACHE, NULL);
                 if (status < 0) {
                         mlog_errno(status);
                         goto bail;
diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c
index 73a16d4666dc..c30b644d9572 100644
--- a/fs/ocfs2/suballoc.c
+++ b/fs/ocfs2/suballoc.c
@@ -310,7 +310,7 @@ int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di,
         int rc;
         struct buffer_head *tmp = *bh;
 
-        rc = ocfs2_read_block(inode, gd_blkno, &tmp,
+        rc = ocfs2_read_block(INODE_CACHE(inode), gd_blkno, &tmp,
                               ocfs2_validate_group_descriptor);
         if (rc)
                 goto out;
@@ -352,7 +352,7 @@ static int ocfs2_block_group_fill(handle_t *handle,
         }
 
         status = ocfs2_journal_access_gd(handle,
-                                         alloc_inode,
+                                         INODE_CACHE(alloc_inode),
                                          bg_bh,
                                          OCFS2_JOURNAL_ACCESS_CREATE);
         if (status < 0) {
@@ -476,7 +476,7 @@ static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
                 mlog_errno(status);
                 goto bail;
         }
-        ocfs2_set_new_buffer_uptodate(alloc_inode, bg_bh);
+        ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
 
         status = ocfs2_block_group_fill(handle,
                                         alloc_inode,
@@ -491,7 +491,7 @@ static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
 
         bg = (struct ocfs2_group_desc *) bg_bh->b_data;
 
-        status = ocfs2_journal_access_di(handle, alloc_inode,
+        status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
                                          bh, OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
@@ -1033,7 +1033,7 @@ static inline int ocfs2_block_group_set_bits(handle_t *handle,
                 journal_type = OCFS2_JOURNAL_ACCESS_UNDO;
 
         status = ocfs2_journal_access_gd(handle,
-                                         alloc_inode,
+                                         INODE_CACHE(alloc_inode),
                                          group_bh,
                                          journal_type);
         if (status < 0) {
@@ -1106,7 +1106,8 @@ static int ocfs2_relink_block_group(handle_t *handle,
         bg_ptr = le64_to_cpu(bg->bg_next_group);
         prev_bg_ptr = le64_to_cpu(prev_bg->bg_next_group);
 
-        status = ocfs2_journal_access_gd(handle, alloc_inode, prev_bg_bh,
+        status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
+                                         prev_bg_bh,
                                          OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
@@ -1121,8 +1122,8 @@ static int ocfs2_relink_block_group(handle_t *handle,
                 goto out_rollback;
         }
 
-        status = ocfs2_journal_access_gd(handle, alloc_inode, bg_bh,
-                                         OCFS2_JOURNAL_ACCESS_WRITE);
+        status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
+                                         bg_bh, OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
                 goto out_rollback;
@@ -1136,8 +1137,8 @@ static int ocfs2_relink_block_group(handle_t *handle,
                 goto out_rollback;
         }
 
-        status = ocfs2_journal_access_di(handle, alloc_inode, fe_bh,
-                                         OCFS2_JOURNAL_ACCESS_WRITE);
+        status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
+                                         fe_bh, OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
                 goto out_rollback;
@@ -1288,7 +1289,7 @@ static int ocfs2_alloc_dinode_update_counts(struct inode *inode,
         struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
         struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &di->id2.i_chain;
 
-        ret = ocfs2_journal_access_di(handle, inode, di_bh,
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret < 0) {
                 mlog_errno(ret);
@@ -1461,7 +1462,7 @@ static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
         /* Ok, claim our bits now: set the info on dinode, chainlist
          * and then the group */
         status = ocfs2_journal_access_di(handle,
-                                         alloc_inode,
+                                         INODE_CACHE(alloc_inode),
                                          ac->ac_bh,
                                          OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
@@ -1907,8 +1908,8 @@ static inline int ocfs2_block_group_clear_bits(handle_t *handle,
         if (ocfs2_is_cluster_bitmap(alloc_inode))
                 journal_type = OCFS2_JOURNAL_ACCESS_UNDO;
 
-        status = ocfs2_journal_access_gd(handle, alloc_inode, group_bh,
-                                         journal_type);
+        status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
+                                         group_bh, journal_type);
         if (status < 0) {
                 mlog_errno(status);
                 goto bail;
@@ -1993,8 +1994,8 @@ int ocfs2_free_suballoc_bits(handle_t *handle,
                 goto bail;
         }
 
-        status = ocfs2_journal_access_di(handle, alloc_inode, alloc_bh,
-                                         OCFS2_JOURNAL_ACCESS_WRITE);
+        status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
+                                         alloc_bh, OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
                 goto bail;
@@ -2151,7 +2152,7 @@ int ocfs2_lock_allocators(struct inode *inode,
 
         BUG_ON(clusters_to_add != 0 && data_ac == NULL);
 
-        num_free_extents = ocfs2_num_free_extents(osb, inode, et);
+        num_free_extents = ocfs2_num_free_extents(osb, et);
         if (num_free_extents < 0) {
                 ret = num_free_extents;
                 mlog_errno(ret);
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index a3f8871d21fd..c0e48aeebb1c 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -28,7 +28,6 @@
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/highmem.h>
-#include <linux/utsname.h>
 #include <linux/init.h>
 #include <linux/random.h>
 #include <linux/statfs.h>
@@ -69,6 +68,7 @@
 #include "ver.h"
 #include "xattr.h"
 #include "quota.h"
+#include "refcounttree.h"
 
 #include "buffer_head_io.h"
 
@@ -373,7 +373,7 @@ static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
 }
 #endif  /* CONFIG_DEBUG_FS */
 
-static struct file_operations ocfs2_osb_debug_fops = {
+static const struct file_operations ocfs2_osb_debug_fops = {
         .open =         ocfs2_osb_debug_open,
         .release =      ocfs2_debug_release,
         .read =         ocfs2_debug_read,
@@ -965,7 +965,7 @@ static int ocfs2_quota_off(struct super_block *sb, int type, int remount)
         return vfs_quota_disable(sb, type, DQUOT_LIMITS_ENABLED);
 }
 
-static struct quotactl_ops ocfs2_quotactl_ops = {
+static const struct quotactl_ops ocfs2_quotactl_ops = {
         .quota_on       = ocfs2_quota_on,
         .quota_off      = ocfs2_quota_off,
         .quota_sync     = vfs_quota_sync,
@@ -1668,8 +1668,6 @@ static void ocfs2_inode_init_once(void *data)
         spin_lock_init(&oi->ip_lock);
         ocfs2_extent_map_init(&oi->vfs_inode);
         INIT_LIST_HEAD(&oi->ip_io_markers);
-        oi->ip_created_trans = 0;
-        oi->ip_last_trans = 0;
         oi->ip_dir_start_lookup = 0;
 
         init_rwsem(&oi->ip_alloc_sem);
@@ -1683,7 +1681,8 @@ static void ocfs2_inode_init_once(void *data)
         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
 
-        ocfs2_metadata_cache_init(&oi->vfs_inode);
+        ocfs2_metadata_cache_init(INODE_CACHE(&oi->vfs_inode),
+                                  &ocfs2_inode_caching_ops);
 
         inode_init_once(&oi->vfs_inode);
 }
@@ -1859,6 +1858,8 @@ static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
 
         ocfs2_sync_blockdev(sb);
 
+        ocfs2_purge_refcount_trees(osb);
+
         /* No cluster connection means we've failed during mount, so skip
          * all the steps which depended on that to complete. */
         if (osb->cconn) {
@@ -2065,6 +2066,8 @@ static int ocfs2_initialize_super(struct super_block *sb,
                 goto bail;
         }
 
+        osb->osb_rf_lock_tree = RB_ROOT;
+
         osb->s_feature_compat =
                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
         osb->s_feature_ro_compat =
@@ -2490,7 +2493,8 @@ void __ocfs2_abort(struct super_block* sb,
         /* Force a panic(). This stinks, but it's better than letting
          * things continue without having a proper hard readonly
          * here. */
-        OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
+        if (!ocfs2_mount_local(OCFS2_SB(sb)))
+                OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
         ocfs2_handle_error(sb);
 }
 
diff --git a/fs/ocfs2/symlink.c b/fs/ocfs2/symlink.c
index 579dd1b1110f..e3421030a69f 100644
--- a/fs/ocfs2/symlink.c
+++ b/fs/ocfs2/symlink.c
@@ -38,7 +38,6 @@
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/pagemap.h>
-#include <linux/utsname.h>
 #include <linux/namei.h>
 
 #define MLOG_MASK_PREFIX ML_NAMEI
diff --git a/fs/ocfs2/uptodate.c b/fs/ocfs2/uptodate.c
index 187b99ff0368..b6284f235d2f 100644
--- a/fs/ocfs2/uptodate.c
+++ b/fs/ocfs2/uptodate.c
@@ -75,15 +75,77 @@ struct ocfs2_meta_cache_item {
 
 static struct kmem_cache *ocfs2_uptodate_cachep = NULL;
 
-void ocfs2_metadata_cache_init(struct inode *inode)
+u64 ocfs2_metadata_cache_owner(struct ocfs2_caching_info *ci)
 {
-        struct ocfs2_inode_info *oi = OCFS2_I(inode);
-        struct ocfs2_caching_info *ci = &oi->ip_metadata_cache;
+        BUG_ON(!ci || !ci->ci_ops);
 
-        oi->ip_flags |= OCFS2_INODE_CACHE_INLINE;
+        return ci->ci_ops->co_owner(ci);
+}
+
+struct super_block *ocfs2_metadata_cache_get_super(struct ocfs2_caching_info *ci)
+{
+        BUG_ON(!ci || !ci->ci_ops);
+
+        return ci->ci_ops->co_get_super(ci);
+}
+
+static void ocfs2_metadata_cache_lock(struct ocfs2_caching_info *ci)
+{
+        BUG_ON(!ci || !ci->ci_ops);
+
+        ci->ci_ops->co_cache_lock(ci);
+}
+
+static void ocfs2_metadata_cache_unlock(struct ocfs2_caching_info *ci)
+{
+        BUG_ON(!ci || !ci->ci_ops);
+
+        ci->ci_ops->co_cache_unlock(ci);
+}
+
+void ocfs2_metadata_cache_io_lock(struct ocfs2_caching_info *ci)
+{
+        BUG_ON(!ci || !ci->ci_ops);
+
+        ci->ci_ops->co_io_lock(ci);
+}
+
+void ocfs2_metadata_cache_io_unlock(struct ocfs2_caching_info *ci)
+{
+        BUG_ON(!ci || !ci->ci_ops);
+
+        ci->ci_ops->co_io_unlock(ci);
+}
+
+
+static void ocfs2_metadata_cache_reset(struct ocfs2_caching_info *ci,
+                                       int clear)
+{
+        ci->ci_flags |= OCFS2_CACHE_FL_INLINE;
         ci->ci_num_cached = 0;
+
+        if (clear) {
+                ci->ci_created_trans = 0;
+                ci->ci_last_trans = 0;
+        }
+}
+
+void ocfs2_metadata_cache_init(struct ocfs2_caching_info *ci,
+                               const struct ocfs2_caching_operations *ops)
+{
+        BUG_ON(!ops);
+
+        ci->ci_ops = ops;
+        ocfs2_metadata_cache_reset(ci, 1);
 }
 
+void ocfs2_metadata_cache_exit(struct ocfs2_caching_info *ci)
+{
+        ocfs2_metadata_cache_purge(ci);
+        ocfs2_metadata_cache_reset(ci, 1);
+}
+
+
 /* No lock taken here as 'root' is not expected to be visible to other
  * processes. */
 static unsigned int ocfs2_purge_copied_metadata_tree(struct rb_root *root)
@@ -112,19 +174,20 @@ static unsigned int ocfs2_purge_copied_metadata_tree(struct rb_root *root)
  * This function is a few more lines longer than necessary due to some
  * accounting done here, but I think it's worth tracking down those
  * bugs sooner -- Mark */
-void ocfs2_metadata_cache_purge(struct inode *inode)
+void ocfs2_metadata_cache_purge(struct ocfs2_caching_info *ci)
 {
-        struct ocfs2_inode_info *oi = OCFS2_I(inode);
         unsigned int tree, to_purge, purged;
-        struct ocfs2_caching_info *ci = &oi->ip_metadata_cache;
         struct rb_root root = RB_ROOT;
 
-        spin_lock(&oi->ip_lock);
-        tree = !(oi->ip_flags & OCFS2_INODE_CACHE_INLINE);
+        BUG_ON(!ci || !ci->ci_ops);
+
+        ocfs2_metadata_cache_lock(ci);
+        tree = !(ci->ci_flags & OCFS2_CACHE_FL_INLINE);
         to_purge = ci->ci_num_cached;
 
-        mlog(0, "Purge %u %s items from Inode %llu\n", to_purge,
-             tree ? "array" : "tree", (unsigned long long)oi->ip_blkno);
+        mlog(0, "Purge %u %s items from Owner %llu\n", to_purge,
+             tree ? "array" : "tree",
+             (unsigned long long)ocfs2_metadata_cache_owner(ci));
 
         /* If we're a tree, save off the root so that we can safely
          * initialize the cache. We do the work to free tree members
@@ -132,16 +195,17 @@ void ocfs2_metadata_cache_purge(struct inode *inode)
         if (tree)
                 root = ci->ci_cache.ci_tree;
 
-        ocfs2_metadata_cache_init(inode);
-        spin_unlock(&oi->ip_lock);
+        ocfs2_metadata_cache_reset(ci, 0);
+        ocfs2_metadata_cache_unlock(ci);
 
         purged = ocfs2_purge_copied_metadata_tree(&root);
         /* If possible, track the number wiped so that we can more
          * easily detect counting errors. Unfortunately, this is only
          * meaningful for trees. */
         if (tree && purged != to_purge)
-                mlog(ML_ERROR, "Inode %llu, count = %u, purged = %u\n",
-                     (unsigned long long)oi->ip_blkno, to_purge, purged);
+                mlog(ML_ERROR, "Owner %llu, count = %u, purged = %u\n",
+                     (unsigned long long)ocfs2_metadata_cache_owner(ci),
+                     to_purge, purged);
 }
 
 /* Returns the index in the cache array, -1 if not found.
@@ -182,27 +246,25 @@ ocfs2_search_cache_tree(struct ocfs2_caching_info *ci,
         return NULL;
 }
 
-static int ocfs2_buffer_cached(struct ocfs2_inode_info *oi,
+static int ocfs2_buffer_cached(struct ocfs2_caching_info *ci,
                                struct buffer_head *bh)
 {
         int index = -1;
         struct ocfs2_meta_cache_item *item = NULL;
 
-        spin_lock(&oi->ip_lock);
+        ocfs2_metadata_cache_lock(ci);
 
-        mlog(0, "Inode %llu, query block %llu (inline = %u)\n",
-             (unsigned long long)oi->ip_blkno,
+        mlog(0, "Owner %llu, query block %llu (inline = %u)\n",
+             (unsigned long long)ocfs2_metadata_cache_owner(ci),
              (unsigned long long) bh->b_blocknr,
-             !!(oi->ip_flags & OCFS2_INODE_CACHE_INLINE));
+             !!(ci->ci_flags & OCFS2_CACHE_FL_INLINE));
 
-        if (oi->ip_flags & OCFS2_INODE_CACHE_INLINE)
-                index = ocfs2_search_cache_array(&oi->ip_metadata_cache,
-                                                 bh->b_blocknr);
+        if (ci->ci_flags & OCFS2_CACHE_FL_INLINE)
+                index = ocfs2_search_cache_array(ci, bh->b_blocknr);
         else
-                item = ocfs2_search_cache_tree(&oi->ip_metadata_cache,
-                                               bh->b_blocknr);
+                item = ocfs2_search_cache_tree(ci, bh->b_blocknr);
 
-        spin_unlock(&oi->ip_lock);
+        ocfs2_metadata_cache_unlock(ci);
 
         mlog(0, "index = %d, item = %p\n", index, item);
 
@@ -214,7 +276,7 @@ static int ocfs2_buffer_cached(struct ocfs2_inode_info *oi,
  * 
  * This can be called under lock_buffer()
  */
-int ocfs2_buffer_uptodate(struct inode *inode,
+int ocfs2_buffer_uptodate(struct ocfs2_caching_info *ci,
                           struct buffer_head *bh)
 {
         /* Doesn't matter if the bh is in our cache or not -- if it's
@@ -230,24 +292,24 @@ int ocfs2_buffer_uptodate(struct inode *inode,
 
         /* Ok, locally the buffer is marked as up to date, now search
          * our cache to see if we can trust that. */
-        return ocfs2_buffer_cached(OCFS2_I(inode), bh);
+        return ocfs2_buffer_cached(ci, bh);
 }
 
-/* 
+/*
  * Determine whether a buffer is currently out on a read-ahead request.
- * ip_io_sem should be held to serialize submitters with the logic here.
+ * ci_io_sem should be held to serialize submitters with the logic here.
  */
-int ocfs2_buffer_read_ahead(struct inode *inode,
+int ocfs2_buffer_read_ahead(struct ocfs2_caching_info *ci,
                             struct buffer_head *bh)
 {
-        return buffer_locked(bh) && ocfs2_buffer_cached(OCFS2_I(inode), bh);
+        return buffer_locked(bh) && ocfs2_buffer_cached(ci, bh);
 }
 
 /* Requires ip_lock */
 static void ocfs2_append_cache_array(struct ocfs2_caching_info *ci,
                                      sector_t block)
 {
-        BUG_ON(ci->ci_num_cached >= OCFS2_INODE_MAX_CACHE_ARRAY);
+        BUG_ON(ci->ci_num_cached >= OCFS2_CACHE_INFO_MAX_ARRAY);
 
         mlog(0, "block %llu takes position %u\n", (unsigned long long) block,
              ci->ci_num_cached);
@@ -292,66 +354,64 @@ static void __ocfs2_insert_cache_tree(struct ocfs2_caching_info *ci,
         ci->ci_num_cached++;
 }
 
-static inline int ocfs2_insert_can_use_array(struct ocfs2_inode_info *oi,
-                                             struct ocfs2_caching_info *ci)
+/* co_cache_lock() must be held */
+static inline int ocfs2_insert_can_use_array(struct ocfs2_caching_info *ci)
 {
-        assert_spin_locked(&oi->ip_lock);
-
-        return (oi->ip_flags & OCFS2_INODE_CACHE_INLINE) &&
-                (ci->ci_num_cached < OCFS2_INODE_MAX_CACHE_ARRAY);
+        return (ci->ci_flags & OCFS2_CACHE_FL_INLINE) &&
+                (ci->ci_num_cached < OCFS2_CACHE_INFO_MAX_ARRAY);
 }
 
-/* tree should be exactly OCFS2_INODE_MAX_CACHE_ARRAY wide. NULL the
+/* tree should be exactly OCFS2_CACHE_INFO_MAX_ARRAY wide. NULL the
  * pointers in tree after we use them - this allows caller to detect
- * when to free in case of error. */
-static void ocfs2_expand_cache(struct ocfs2_inode_info *oi,
+ * when to free in case of error.
+ *
+ * The co_cache_lock() must be held. */
+static void ocfs2_expand_cache(struct ocfs2_caching_info *ci,
                                struct ocfs2_meta_cache_item **tree)
 {
         int i;
-        struct ocfs2_caching_info *ci = &oi->ip_metadata_cache;
 
-        mlog_bug_on_msg(ci->ci_num_cached != OCFS2_INODE_MAX_CACHE_ARRAY,
-                        "Inode %llu, num cached = %u, should be %u\n",
-                        (unsigned long long)oi->ip_blkno, ci->ci_num_cached,
-                        OCFS2_INODE_MAX_CACHE_ARRAY);
-        mlog_bug_on_msg(!(oi->ip_flags & OCFS2_INODE_CACHE_INLINE),
-                        "Inode %llu not marked as inline anymore!\n",
-                        (unsigned long long)oi->ip_blkno);
-        assert_spin_locked(&oi->ip_lock);
+        mlog_bug_on_msg(ci->ci_num_cached != OCFS2_CACHE_INFO_MAX_ARRAY,
+                        "Owner %llu, num cached = %u, should be %u\n",
+                        (unsigned long long)ocfs2_metadata_cache_owner(ci),
+                        ci->ci_num_cached, OCFS2_CACHE_INFO_MAX_ARRAY);
+        mlog_bug_on_msg(!(ci->ci_flags & OCFS2_CACHE_FL_INLINE),
+                        "Owner %llu not marked as inline anymore!\n",
+                        (unsigned long long)ocfs2_metadata_cache_owner(ci));
 
         /* Be careful to initialize the tree members *first* because
          * once the ci_tree is used, the array is junk... */
-        for(i = 0; i < OCFS2_INODE_MAX_CACHE_ARRAY; i++)
+        for (i = 0; i < OCFS2_CACHE_INFO_MAX_ARRAY; i++)
                 tree[i]->c_block = ci->ci_cache.ci_array[i];
 
-        oi->ip_flags &= ~OCFS2_INODE_CACHE_INLINE;
+        ci->ci_flags &= ~OCFS2_CACHE_FL_INLINE;
         ci->ci_cache.ci_tree = RB_ROOT;
         /* this will be set again by __ocfs2_insert_cache_tree */
         ci->ci_num_cached = 0;
 
-        for(i = 0; i < OCFS2_INODE_MAX_CACHE_ARRAY; i++) {
+        for (i = 0; i < OCFS2_CACHE_INFO_MAX_ARRAY; i++) {
                 __ocfs2_insert_cache_tree(ci, tree[i]);
                 tree[i] = NULL;
         }
 
         mlog(0, "Expanded %llu to a tree cache: flags 0x%x, num = %u\n",
-             (unsigned long long)oi->ip_blkno, oi->ip_flags, ci->ci_num_cached);
+             (unsigned long long)ocfs2_metadata_cache_owner(ci),
+             ci->ci_flags, ci->ci_num_cached);
 }
 
 /* Slow path function - memory allocation is necessary. See the
  * comment above ocfs2_set_buffer_uptodate for more information. */
-static void __ocfs2_set_buffer_uptodate(struct ocfs2_inode_info *oi,
+static void __ocfs2_set_buffer_uptodate(struct ocfs2_caching_info *ci,
                                         sector_t block,
                                         int expand_tree)
 {
         int i;
-        struct ocfs2_caching_info *ci = &oi->ip_metadata_cache;
         struct ocfs2_meta_cache_item *new = NULL;
-        struct ocfs2_meta_cache_item *tree[OCFS2_INODE_MAX_CACHE_ARRAY] =
+        struct ocfs2_meta_cache_item *tree[OCFS2_CACHE_INFO_MAX_ARRAY] =
                 { NULL, };
 
-        mlog(0, "Inode %llu, block %llu, expand = %d\n",
-             (unsigned long long)oi->ip_blkno,
+        mlog(0, "Owner %llu, block %llu, expand = %d\n",
+             (unsigned long long)ocfs2_metadata_cache_owner(ci),
              (unsigned long long)block, expand_tree);
 
         new = kmem_cache_alloc(ocfs2_uptodate_cachep, GFP_NOFS);
@@ -364,7 +424,7 @@ static void __ocfs2_set_buffer_uptodate(struct ocfs2_inode_info *oi,
         if (expand_tree) {
                 /* Do *not* allocate an array here - the removal code
                  * has no way of tracking that. */
-                for(i = 0; i < OCFS2_INODE_MAX_CACHE_ARRAY; i++) {
+                for (i = 0; i < OCFS2_CACHE_INFO_MAX_ARRAY; i++) {
                         tree[i] = kmem_cache_alloc(ocfs2_uptodate_cachep,
                                                    GFP_NOFS);
                         if (!tree[i]) {
@@ -376,21 +436,21 @@ static void __ocfs2_set_buffer_uptodate(struct ocfs2_inode_info *oi,
                 }
         }
 
-        spin_lock(&oi->ip_lock);
-        if (ocfs2_insert_can_use_array(oi, ci)) {
+        ocfs2_metadata_cache_lock(ci);
+        if (ocfs2_insert_can_use_array(ci)) {
                 mlog(0, "Someone cleared the tree underneath us\n");
                 /* Ok, items were removed from the cache in between
                  * locks. Detect this and revert back to the fast path */
                 ocfs2_append_cache_array(ci, block);
-                spin_unlock(&oi->ip_lock);
+                ocfs2_metadata_cache_unlock(ci);
                 goto out_free;
         }
 
         if (expand_tree)
-                ocfs2_expand_cache(oi, tree);
+                ocfs2_expand_cache(ci, tree);
 
         __ocfs2_insert_cache_tree(ci, new);
-        spin_unlock(&oi->ip_lock);
+        ocfs2_metadata_cache_unlock(ci);
 
         new = NULL;
 out_free:
@@ -400,14 +460,14 @@ out_free:
         /* If these were used, then ocfs2_expand_cache re-set them to
          * NULL for us. */
         if (tree[0]) {
-                for(i = 0; i < OCFS2_INODE_MAX_CACHE_ARRAY; i++)
+                for (i = 0; i < OCFS2_CACHE_INFO_MAX_ARRAY; i++)
                         if (tree[i])
                                 kmem_cache_free(ocfs2_uptodate_cachep,
                                                 tree[i]);
         }
 }
 
-/* Item insertion is guarded by ip_io_mutex, so the insertion path takes
+/* Item insertion is guarded by co_io_lock(), so the insertion path takes
  * advantage of this by not rechecking for a duplicate insert during
  * the slow case. Additionally, if the cache needs to be bumped up to
  * a tree, the code will not recheck after acquiring the lock --
@@ -425,59 +485,55 @@ out_free:
  * Readahead buffers can be passed in here before the I/O request is
  * completed.
  */
-void ocfs2_set_buffer_uptodate(struct inode *inode,
+void ocfs2_set_buffer_uptodate(struct ocfs2_caching_info *ci,
                                struct buffer_head *bh)
 {
         int expand;
-        struct ocfs2_inode_info *oi = OCFS2_I(inode);
-        struct ocfs2_caching_info *ci = &oi->ip_metadata_cache;
 
         /* The block may very well exist in our cache already, so avoid
          * doing any more work in that case. */
-        if (ocfs2_buffer_cached(oi, bh))
+        if (ocfs2_buffer_cached(ci, bh))
                 return;
 
-        mlog(0, "Inode %llu, inserting block %llu\n",
-             (unsigned long long)oi->ip_blkno,
+        mlog(0, "Owner %llu, inserting block %llu\n",
+             (unsigned long long)ocfs2_metadata_cache_owner(ci),
              (unsigned long long)bh->b_blocknr);
 
         /* No need to recheck under spinlock - insertion is guarded by
-         * ip_io_mutex */
-        spin_lock(&oi->ip_lock);
-        if (ocfs2_insert_can_use_array(oi, ci)) {
+         * co_io_lock() */
+        ocfs2_metadata_cache_lock(ci);
+        if (ocfs2_insert_can_use_array(ci)) {
                 /* Fast case - it's an array and there's a free
                  * spot. */
                 ocfs2_append_cache_array(ci, bh->b_blocknr);
-                spin_unlock(&oi->ip_lock);
+                ocfs2_metadata_cache_unlock(ci);
                 return;
         }
 
         expand = 0;
-        if (oi->ip_flags & OCFS2_INODE_CACHE_INLINE) {
+        if (ci->ci_flags & OCFS2_CACHE_FL_INLINE) {
                 /* We need to bump things up to a tree. */
                 expand = 1;
         }
-        spin_unlock(&oi->ip_lock);
+        ocfs2_metadata_cache_unlock(ci);
 
-        __ocfs2_set_buffer_uptodate(oi, bh->b_blocknr, expand);
+        __ocfs2_set_buffer_uptodate(ci, bh->b_blocknr, expand);
 }
 
 /* Called against a newly allocated buffer. Most likely nobody should
  * be able to read this sort of metadata while it's still being
- * allocated, but this is careful to take ip_io_mutex anyway. */
-void ocfs2_set_new_buffer_uptodate(struct inode *inode,
+ * allocated, but this is careful to take co_io_lock() anyway. */
+void ocfs2_set_new_buffer_uptodate(struct ocfs2_caching_info *ci,
                                    struct buffer_head *bh)
 {
-        struct ocfs2_inode_info *oi = OCFS2_I(inode);
-
         /* This should definitely *not* exist in our cache */
-        BUG_ON(ocfs2_buffer_cached(oi, bh));
+        BUG_ON(ocfs2_buffer_cached(ci, bh));
 
         set_buffer_uptodate(bh);
 
-        mutex_lock(&oi->ip_io_mutex);
-        ocfs2_set_buffer_uptodate(inode, bh);
-        mutex_unlock(&oi->ip_io_mutex);
+        ocfs2_metadata_cache_io_lock(ci);
+        ocfs2_set_buffer_uptodate(ci, bh);
+        ocfs2_metadata_cache_io_unlock(ci);
 }
 
 /* Requires ip_lock. */
@@ -487,7 +543,7 @@ static void ocfs2_remove_metadata_array(struct ocfs2_caching_info *ci,
         sector_t *array = ci->ci_cache.ci_array;
         int bytes;
 
-        BUG_ON(index < 0 || index >= OCFS2_INODE_MAX_CACHE_ARRAY);
+        BUG_ON(index < 0 || index >= OCFS2_CACHE_INFO_MAX_ARRAY);
         BUG_ON(index >= ci->ci_num_cached);
         BUG_ON(!ci->ci_num_cached);
 
@@ -515,21 +571,19 @@ static void ocfs2_remove_metadata_tree(struct ocfs2_caching_info *ci,
         ci->ci_num_cached--;
 }
 
-static void ocfs2_remove_block_from_cache(struct inode *inode,
+static void ocfs2_remove_block_from_cache(struct ocfs2_caching_info *ci,
                                           sector_t block)
 {
         int index;
         struct ocfs2_meta_cache_item *item = NULL;
-        struct ocfs2_inode_info *oi = OCFS2_I(inode);
-        struct ocfs2_caching_info *ci = &oi->ip_metadata_cache;
 
-        spin_lock(&oi->ip_lock);
-        mlog(0, "Inode %llu, remove %llu, items = %u, array = %u\n",
-             (unsigned long long)oi->ip_blkno,
+        ocfs2_metadata_cache_lock(ci);
+        mlog(0, "Owner %llu, remove %llu, items = %u, array = %u\n",
+             (unsigned long long)ocfs2_metadata_cache_owner(ci),
              (unsigned long long) block, ci->ci_num_cached,
-             oi->ip_flags & OCFS2_INODE_CACHE_INLINE);
+             ci->ci_flags & OCFS2_CACHE_FL_INLINE);
 
-        if (oi->ip_flags & OCFS2_INODE_CACHE_INLINE) {
+        if (ci->ci_flags & OCFS2_CACHE_FL_INLINE) {
                 index = ocfs2_search_cache_array(ci, block);
                 if (index != -1)
                         ocfs2_remove_metadata_array(ci, index);
@@ -538,7 +592,7 @@ static void ocfs2_remove_block_from_cache(struct inode *inode,
                 if (item)
                         ocfs2_remove_metadata_tree(ci, item);
         }
-        spin_unlock(&oi->ip_lock);
+        ocfs2_metadata_cache_unlock(ci);
 
         if (item)
                 kmem_cache_free(ocfs2_uptodate_cachep, item);
@@ -549,23 +603,24 @@ static void ocfs2_remove_block_from_cache(struct inode *inode,
  * bother reverting things to an inlined array in the case of a remove
  * which moves us back under the limit.
  */
-void ocfs2_remove_from_cache(struct inode *inode,
+void ocfs2_remove_from_cache(struct ocfs2_caching_info *ci,
                              struct buffer_head *bh)
 {
         sector_t block = bh->b_blocknr;
 
-        ocfs2_remove_block_from_cache(inode, block);
+        ocfs2_remove_block_from_cache(ci, block);
 }
 
 /* Called when we remove xattr clusters from an inode. */
-void ocfs2_remove_xattr_clusters_from_cache(struct inode *inode,
+void ocfs2_remove_xattr_clusters_from_cache(struct ocfs2_caching_info *ci,
                                             sector_t block,
                                             u32 c_len)
 {
-        unsigned int i, b_len = ocfs2_clusters_to_blocks(inode->i_sb, 1) * c_len;
+        struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
+        unsigned int i, b_len = ocfs2_clusters_to_blocks(sb, 1) * c_len;
 
         for (i = 0; i < b_len; i++, block++)
-                ocfs2_remove_block_from_cache(inode, block);
+                ocfs2_remove_block_from_cache(ci, block);
 }
 
 int __init init_ocfs2_uptodate_cache(void)
@@ -577,7 +632,7 @@ int __init init_ocfs2_uptodate_cache(void)
                 return -ENOMEM;
 
         mlog(0, "%u inlined cache items per inode.\n",
-             OCFS2_INODE_MAX_CACHE_ARRAY);
+             OCFS2_CACHE_INFO_MAX_ARRAY);
 
         return 0;
 }
diff --git a/fs/ocfs2/uptodate.h b/fs/ocfs2/uptodate.h
index 531b4b3a0c47..0d826fe2da0d 100644
--- a/fs/ocfs2/uptodate.h
+++ b/fs/ocfs2/uptodate.h
@@ -26,24 +26,59 @@
 #ifndef OCFS2_UPTODATE_H
 #define OCFS2_UPTODATE_H
 
+/*
+ * The caching code relies on locking provided by the user of
+ * struct ocfs2_caching_info.  These operations connect that up.
+ */
+struct ocfs2_caching_operations {
+        /*
+         * A u64 representing the owning structure.  Usually this
+         * is the block number (i_blkno or whatnot).  This is used so
+         * that caching log messages can identify the owning structure.
+         */
+        u64     (*co_owner)(struct ocfs2_caching_info *ci);
+
+        /* The superblock is needed during I/O. */
+        struct super_block *(*co_get_super)(struct ocfs2_caching_info *ci);
+        /*
+         * Lock and unlock the caching data.  These will not sleep, and
+         * should probably be spinlocks.
+         */
+        void    (*co_cache_lock)(struct ocfs2_caching_info *ci);
+        void    (*co_cache_unlock)(struct ocfs2_caching_info *ci);
+
+        /*
+         * Lock and unlock for disk I/O.  These will sleep, and should
+         * be mutexes.
+         */
+        void    (*co_io_lock)(struct ocfs2_caching_info *ci);
+        void    (*co_io_unlock)(struct ocfs2_caching_info *ci);
+};
+
 int __init init_ocfs2_uptodate_cache(void);
 void exit_ocfs2_uptodate_cache(void);
 
-void ocfs2_metadata_cache_init(struct inode *inode);
-void ocfs2_metadata_cache_purge(struct inode *inode);
+void ocfs2_metadata_cache_init(struct ocfs2_caching_info *ci,
+                               const struct ocfs2_caching_operations *ops);
+void ocfs2_metadata_cache_purge(struct ocfs2_caching_info *ci);
+void ocfs2_metadata_cache_exit(struct ocfs2_caching_info *ci);
+
+u64 ocfs2_metadata_cache_owner(struct ocfs2_caching_info *ci);
+void ocfs2_metadata_cache_io_lock(struct ocfs2_caching_info *ci);
+void ocfs2_metadata_cache_io_unlock(struct ocfs2_caching_info *ci);
 
-int ocfs2_buffer_uptodate(struct inode *inode,
+int ocfs2_buffer_uptodate(struct ocfs2_caching_info *ci,
                           struct buffer_head *bh);
-void ocfs2_set_buffer_uptodate(struct inode *inode,
+void ocfs2_set_buffer_uptodate(struct ocfs2_caching_info *ci,
                                struct buffer_head *bh);
-void ocfs2_set_new_buffer_uptodate(struct inode *inode,
+void ocfs2_set_new_buffer_uptodate(struct ocfs2_caching_info *ci,
                                    struct buffer_head *bh);
-void ocfs2_remove_from_cache(struct inode *inode,
+void ocfs2_remove_from_cache(struct ocfs2_caching_info *ci,
                              struct buffer_head *bh);
-void ocfs2_remove_xattr_clusters_from_cache(struct inode *inode,
+void ocfs2_remove_xattr_clusters_from_cache(struct ocfs2_caching_info *ci,
                                             sector_t block,
                                             u32 c_len);
-int ocfs2_buffer_read_ahead(struct inode *inode,
+int ocfs2_buffer_read_ahead(struct ocfs2_caching_info *ci,
                             struct buffer_head *bh);
 
 #endif /* OCFS2_UPTODATE_H */
diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index d1a27cda984f..fe3419068df2 100644
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -55,7 +55,8 @@
 #include "buffer_head_io.h"
 #include "super.h"
 #include "xattr.h"
-
+#include "refcounttree.h"
+#include "acl.h"
 
 struct ocfs2_xattr_def_value_root {
         struct ocfs2_xattr_value_root   xv;
@@ -140,7 +141,7 @@ struct ocfs2_xattr_search {
         int not_found;
 };
 
-static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
+static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
                                              struct ocfs2_xattr_header *xh,
                                              int index,
                                              int *block_off,
@@ -157,7 +158,7 @@ static int ocfs2_xattr_index_block_find(struct inode *inode,
                                         struct ocfs2_xattr_search *xs);
 
 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
-                                        struct ocfs2_xattr_tree_root *xt,
+                                        struct buffer_head *blk_bh,
                                         char *buffer,
                                         size_t buffer_size);
 
@@ -170,12 +171,42 @@ static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
                                              struct ocfs2_xattr_search *xs,
                                              struct ocfs2_xattr_set_ctxt *ctxt);
 
-static int ocfs2_delete_xattr_index_block(struct inode *inode,
-                                          struct buffer_head *xb_bh);
+typedef int (xattr_tree_rec_func)(struct inode *inode,
+                                  struct buffer_head *root_bh,
+                                  u64 blkno, u32 cpos, u32 len, void *para);
+static int ocfs2_iterate_xattr_index_block(struct inode *inode,
+                                           struct buffer_head *root_bh,
+                                           xattr_tree_rec_func *rec_func,
+                                           void *para);
+static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
+                                        struct ocfs2_xattr_bucket *bucket,
+                                        void *para);
+static int ocfs2_rm_xattr_cluster(struct inode *inode,
+                                  struct buffer_head *root_bh,
+                                  u64 blkno,
+                                  u32 cpos,
+                                  u32 len,
+                                  void *para);
+
 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
                                   u64 src_blk, u64 last_blk, u64 to_blk,
                                   unsigned int start_bucket,
                                   u32 *first_hash);
+static int ocfs2_prepare_refcount_xattr(struct inode *inode,
+                                        struct ocfs2_dinode *di,
+                                        struct ocfs2_xattr_info *xi,
+                                        struct ocfs2_xattr_search *xis,
+                                        struct ocfs2_xattr_search *xbs,
+                                        struct ocfs2_refcount_tree **ref_tree,
+                                        int *meta_need,
+                                        int *credits);
+static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
+                                           struct ocfs2_xattr_bucket *bucket,
+                                           int offset,
+                                           struct ocfs2_xattr_value_root **xv,
+                                           struct buffer_head **bh);
+static int ocfs2_xattr_security_set(struct inode *inode, const char *name,
+                                    const void *value, size_t size, int flags);
 
 static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
 {
@@ -254,9 +285,9 @@ static int ocfs2_init_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
                         break;
                 }
 
-                if (!ocfs2_buffer_uptodate(bucket->bu_inode,
+                if (!ocfs2_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
                                            bucket->bu_bhs[i]))
-                        ocfs2_set_new_buffer_uptodate(bucket->bu_inode,
+                        ocfs2_set_new_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
                                                       bucket->bu_bhs[i]);
         }
 
@@ -271,7 +302,7 @@ static int ocfs2_read_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
 {
         int rc;
 
-        rc = ocfs2_read_blocks(bucket->bu_inode, xb_blkno,
+        rc = ocfs2_read_blocks(INODE_CACHE(bucket->bu_inode), xb_blkno,
                                bucket->bu_blocks, bucket->bu_bhs, 0,
                                NULL);
         if (!rc) {
@@ -297,7 +328,8 @@ static int ocfs2_xattr_bucket_journal_access(handle_t *handle,
         int i, rc = 0;
 
         for (i = 0; i < bucket->bu_blocks; i++) {
-                rc = ocfs2_journal_access(handle, bucket->bu_inode,
+                rc = ocfs2_journal_access(handle,
+                                          INODE_CACHE(bucket->bu_inode),
                                           bucket->bu_bhs[i], type);
                 if (rc) {
                         mlog_errno(rc);
@@ -399,7 +431,7 @@ static int ocfs2_read_xattr_block(struct inode *inode, u64 xb_blkno,
         int rc;
         struct buffer_head *tmp = *bh;
 
-        rc = ocfs2_read_block(inode, xb_blkno, &tmp,
+        rc = ocfs2_read_block(INODE_CACHE(inode), xb_blkno, &tmp,
                               ocfs2_validate_xattr_block);
 
         /* If ocfs2_read_block() got us a new bh, pass it up. */
@@ -596,15 +628,14 @@ static int ocfs2_xattr_extend_allocation(struct inode *inode,
         int status = 0;
         handle_t *handle = ctxt->handle;
         enum ocfs2_alloc_restarted why;
-        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
         u32 prev_clusters, logical_start = le32_to_cpu(vb->vb_xv->xr_clusters);
         struct ocfs2_extent_tree et;
 
         mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
 
-        ocfs2_init_xattr_value_extent_tree(&et, inode, vb);
+        ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
 
-        status = vb->vb_access(handle, inode, vb->vb_bh,
+        status = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
                               OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
@@ -612,13 +643,11 @@ static int ocfs2_xattr_extend_allocation(struct inode *inode,
         }
 
         prev_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
-        status = ocfs2_add_clusters_in_btree(osb,
-                                             inode,
+        status = ocfs2_add_clusters_in_btree(handle,
+                                             &et,
                                              &logical_start,
                                              clusters_to_add,
                                              0,
-                                             &et,
-                                             handle,
                                              ctxt->data_ac,
                                              ctxt->meta_ac,
                                              &why);
@@ -649,6 +678,7 @@ leave:
 static int __ocfs2_remove_xattr_range(struct inode *inode,
                                       struct ocfs2_xattr_value_buf *vb,
                                       u32 cpos, u32 phys_cpos, u32 len,
+                                      unsigned int ext_flags,
                                       struct ocfs2_xattr_set_ctxt *ctxt)
 {
         int ret;
@@ -656,16 +686,16 @@ static int __ocfs2_remove_xattr_range(struct inode *inode,
         handle_t *handle = ctxt->handle;
         struct ocfs2_extent_tree et;
 
-        ocfs2_init_xattr_value_extent_tree(&et, inode, vb);
+        ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
 
-        ret = vb->vb_access(handle, inode, vb->vb_bh,
+        ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
                             OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
         }
 
-        ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, ctxt->meta_ac,
+        ret = ocfs2_remove_extent(handle, &et, cpos, len, ctxt->meta_ac,
                                   &ctxt->dealloc);
         if (ret) {
                 mlog_errno(ret);
@@ -680,7 +710,14 @@ static int __ocfs2_remove_xattr_range(struct inode *inode,
                 goto out;
         }
 
-        ret = ocfs2_cache_cluster_dealloc(&ctxt->dealloc, phys_blkno, len);
+        if (ext_flags & OCFS2_EXT_REFCOUNTED)
+                ret = ocfs2_decrease_refcount(inode, handle,
+                                        ocfs2_blocks_to_clusters(inode->i_sb,
+                                                                 phys_blkno),
+                                        len, ctxt->meta_ac, &ctxt->dealloc, 1);
+        else
+                ret = ocfs2_cache_cluster_dealloc(&ctxt->dealloc,
+                                                  phys_blkno, len);
         if (ret)
                 mlog_errno(ret);
 
@@ -695,6 +732,7 @@ static int ocfs2_xattr_shrink_size(struct inode *inode,
                                    struct ocfs2_xattr_set_ctxt *ctxt)
 {
         int ret = 0;
+        unsigned int ext_flags;
         u32 trunc_len, cpos, phys_cpos, alloc_size;
         u64 block;
 
@@ -706,7 +744,7 @@ static int ocfs2_xattr_shrink_size(struct inode *inode,
         while (trunc_len) {
                 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
                                                &alloc_size,
-                                               &vb->vb_xv->xr_list);
+                                               &vb->vb_xv->xr_list, &ext_flags);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -717,15 +755,15 @@ static int ocfs2_xattr_shrink_size(struct inode *inode,
 
                 ret = __ocfs2_remove_xattr_range(inode, vb, cpos,
                                                  phys_cpos, alloc_size,
-                                                 ctxt);
+                                                 ext_flags, ctxt);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
                 }
 
                 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
-                ocfs2_remove_xattr_clusters_from_cache(inode, block,
-                                                       alloc_size);
+                ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode),
+                                                       block, alloc_size);
                 cpos += alloc_size;
                 trunc_len -= alloc_size;
         }
@@ -810,6 +848,23 @@ static int ocfs2_xattr_list_entries(struct inode *inode,
         return result;
 }
 
+int ocfs2_has_inline_xattr_value_outside(struct inode *inode,
+                                         struct ocfs2_dinode *di)
+{
+        struct ocfs2_xattr_header *xh;
+        int i;
+
+        xh = (struct ocfs2_xattr_header *)
+                 ((void *)di + inode->i_sb->s_blocksize -
+                 le16_to_cpu(di->i_xattr_inline_size));
+
+        for (i = 0; i < le16_to_cpu(xh->xh_count); i++)
+                if (!ocfs2_xattr_is_local(&xh->xh_entries[i]))
+                        return 1;
+
+        return 0;
+}
+
 static int ocfs2_xattr_ibody_list(struct inode *inode,
                                   struct ocfs2_dinode *di,
                                   char *buffer,
@@ -855,11 +910,9 @@ static int ocfs2_xattr_block_list(struct inode *inode,
                 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
                 ret = ocfs2_xattr_list_entries(inode, header,
                                                buffer, buffer_size);
-        } else {
-                struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
-                ret = ocfs2_xattr_tree_list_index_block(inode, xt,
+        } else
+                ret = ocfs2_xattr_tree_list_index_block(inode, blk_bh,
                                                    buffer, buffer_size);
-        }
 
         brelse(blk_bh);
 
@@ -961,7 +1014,7 @@ static int ocfs2_xattr_get_value_outside(struct inode *inode,
         cpos = 0;
         while (cpos < clusters) {
                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
-                                               &num_clusters, el);
+                                               &num_clusters, el, NULL);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -970,7 +1023,8 @@ static int ocfs2_xattr_get_value_outside(struct inode *inode,
                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
                 /* Copy ocfs2_xattr_value */
                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
-                        ret = ocfs2_read_block(inode, blkno, &bh, NULL);
+                        ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
+                                               &bh, NULL);
                         if (ret) {
                                 mlog_errno(ret);
                                 goto out;
@@ -1085,7 +1139,7 @@ static int ocfs2_xattr_block_get(struct inode *inode,
                 i = xs->here - xs->header->xh_entries;
 
                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
-                        ret = ocfs2_xattr_bucket_get_name_value(inode,
+                        ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
                                                                 bucket_xh(xs->bucket),
                                                                 i,
                                                                 &block_off,
@@ -1183,7 +1237,7 @@ static int ocfs2_xattr_get(struct inode *inode,
 
 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
                                            handle_t *handle,
-                                           struct ocfs2_xattr_value_root *xv,
+                                           struct ocfs2_xattr_value_buf *vb,
                                            const void *value,
                                            int value_len)
 {
@@ -1194,28 +1248,34 @@ static int __ocfs2_xattr_set_value_outside(struct inode *inode,
         u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
         u64 blkno;
         struct buffer_head *bh = NULL;
+        unsigned int ext_flags;
+        struct ocfs2_xattr_value_root *xv = vb->vb_xv;
 
         BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
 
         while (cpos < clusters) {
                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
-                                               &num_clusters, &xv->xr_list);
+                                               &num_clusters, &xv->xr_list,
+                                               &ext_flags);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
                 }
 
+                BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
+
                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
 
                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
-                        ret = ocfs2_read_block(inode, blkno, &bh, NULL);
+                        ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
+                                               &bh, NULL);
                         if (ret) {
                                 mlog_errno(ret);
                                 goto out;
                         }
 
                         ret = ocfs2_journal_access(handle,
-                                                   inode,
+                                                   INODE_CACHE(inode),
                                                    bh,
                                                    OCFS2_JOURNAL_ACCESS_WRITE);
                         if (ret < 0) {
@@ -1266,7 +1326,7 @@ static int ocfs2_xattr_cleanup(struct inode *inode,
         void *val = xs->base + offs;
         size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
 
-        ret = vb->vb_access(handle, inode, vb->vb_bh,
+        ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
                             OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
@@ -1294,7 +1354,7 @@ static int ocfs2_xattr_update_entry(struct inode *inode,
 {
         int ret;
 
-        ret = vb->vb_access(handle, inode, vb->vb_bh,
+        ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
                             OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
@@ -1355,7 +1415,7 @@ static int ocfs2_xattr_set_value_outside(struct inode *inode,
                 mlog_errno(ret);
                 return ret;
         }
-        ret = __ocfs2_xattr_set_value_outside(inode, ctxt->handle, vb->vb_xv,
+        ret = __ocfs2_xattr_set_value_outside(inode, ctxt->handle, vb,
                                               xi->value, xi->value_len);
         if (ret < 0)
                 mlog_errno(ret);
@@ -1594,7 +1654,7 @@ static int ocfs2_xattr_set_entry(struct inode *inode,
 
                                 ret = __ocfs2_xattr_set_value_outside(inode,
                                                                 handle,
-                                                                vb.vb_xv,
+                                                                &vb,
                                                                 xi->value,
                                                                 xi->value_len);
                                 if (ret < 0)
@@ -1615,7 +1675,7 @@ static int ocfs2_xattr_set_entry(struct inode *inode,
                 }
         }
 
-        ret = ocfs2_journal_access_di(handle, inode, xs->inode_bh,
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), xs->inode_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
@@ -1623,7 +1683,7 @@ static int ocfs2_xattr_set_entry(struct inode *inode,
         }
 
         if (!(flag & OCFS2_INLINE_XATTR_FL)) {
-                ret = vb.vb_access(handle, inode, vb.vb_bh,
+                ret = vb.vb_access(handle, INODE_CACHE(inode), vb.vb_bh,
                                    OCFS2_JOURNAL_ACCESS_WRITE);
                 if (ret) {
                         mlog_errno(ret);
@@ -1700,51 +1760,112 @@ out:
         return ret;
 }
 
+/*
+ * In xattr remove, if it is stored outside and refcounted, we may have
+ * the chance to split the refcount tree. So need the allocators.
+ */
+static int ocfs2_lock_xattr_remove_allocators(struct inode *inode,
+                                        struct ocfs2_xattr_value_root *xv,
+                                        struct ocfs2_caching_info *ref_ci,
+                                        struct buffer_head *ref_root_bh,
+                                        struct ocfs2_alloc_context **meta_ac,
+                                        int *ref_credits)
+{
+        int ret, meta_add = 0;
+        u32 p_cluster, num_clusters;
+        unsigned int ext_flags;
+
+        *ref_credits = 0;
+        ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
+                                       &num_clusters,
+                                       &xv->xr_list,
+                                       &ext_flags);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
+                goto out;
+
+        ret = ocfs2_refcounted_xattr_delete_need(inode, ref_ci,
+                                                 ref_root_bh, xv,
+                                                 &meta_add, ref_credits);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
+                                                meta_add, meta_ac);
+        if (ret)
+                mlog_errno(ret);
+
+out:
+        return ret;
+}
+
 static int ocfs2_remove_value_outside(struct inode*inode,
                                       struct ocfs2_xattr_value_buf *vb,
-                                      struct ocfs2_xattr_header *header)
+                                      struct ocfs2_xattr_header *header,
+                                      struct ocfs2_caching_info *ref_ci,
+                                      struct buffer_head *ref_root_bh)
 {
-        int ret = 0, i;
+        int ret = 0, i, ref_credits;
         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
         struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
+        void *val;
 
         ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
 
-        ctxt.handle = ocfs2_start_trans(osb,
-                                        ocfs2_remove_extent_credits(osb->sb));
-        if (IS_ERR(ctxt.handle)) {
-                ret = PTR_ERR(ctxt.handle);
-                mlog_errno(ret);
-                goto out;
-        }
-
         for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
 
-                if (!ocfs2_xattr_is_local(entry)) {
-                        void *val;
+                if (ocfs2_xattr_is_local(entry))
+                        continue;
 
-                        val = (void *)header +
-                                le16_to_cpu(entry->xe_name_offset);
-                        vb->vb_xv = (struct ocfs2_xattr_value_root *)
-                                (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
-                        ret = ocfs2_xattr_value_truncate(inode, vb, 0, &ctxt);
-                        if (ret < 0) {
-                                mlog_errno(ret);
-                                break;
-                        }
+                val = (void *)header +
+                        le16_to_cpu(entry->xe_name_offset);
+                vb->vb_xv = (struct ocfs2_xattr_value_root *)
+                        (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
+
+                ret = ocfs2_lock_xattr_remove_allocators(inode, vb->vb_xv,
+                                                         ref_ci, ref_root_bh,
+                                                         &ctxt.meta_ac,
+                                                         &ref_credits);
+
+                ctxt.handle = ocfs2_start_trans(osb, ref_credits +
+                                        ocfs2_remove_extent_credits(osb->sb));
+                if (IS_ERR(ctxt.handle)) {
+                        ret = PTR_ERR(ctxt.handle);
+                        mlog_errno(ret);
+                        break;
+                }
+
+                ret = ocfs2_xattr_value_truncate(inode, vb, 0, &ctxt);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        break;
+                }
+
+                ocfs2_commit_trans(osb, ctxt.handle);
+                if (ctxt.meta_ac) {
+                        ocfs2_free_alloc_context(ctxt.meta_ac);
+                        ctxt.meta_ac = NULL;
                 }
         }
 
-        ocfs2_commit_trans(osb, ctxt.handle);
+        if (ctxt.meta_ac)
+                ocfs2_free_alloc_context(ctxt.meta_ac);
         ocfs2_schedule_truncate_log_flush(osb, 1);
         ocfs2_run_deallocs(osb, &ctxt.dealloc);
-out:
         return ret;
 }
 
 static int ocfs2_xattr_ibody_remove(struct inode *inode,
-                                    struct buffer_head *di_bh)
+                                    struct buffer_head *di_bh,
+                                    struct ocfs2_caching_info *ref_ci,
+                                    struct buffer_head *ref_root_bh)
 {
 
         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
@@ -1759,13 +1880,21 @@ static int ocfs2_xattr_ibody_remove(struct inode *inode,
                  ((void *)di + inode->i_sb->s_blocksize -
                  le16_to_cpu(di->i_xattr_inline_size));
 
-        ret = ocfs2_remove_value_outside(inode, &vb, header);
+        ret = ocfs2_remove_value_outside(inode, &vb, header,
+                                         ref_ci, ref_root_bh);
 
         return ret;
 }
 
+struct ocfs2_rm_xattr_bucket_para {
+        struct ocfs2_caching_info *ref_ci;
+        struct buffer_head *ref_root_bh;
+};
+
 static int ocfs2_xattr_block_remove(struct inode *inode,
-                                    struct buffer_head *blk_bh)
+                                    struct buffer_head *blk_bh,
+                                    struct ocfs2_caching_info *ref_ci,
+                                    struct buffer_head *ref_root_bh)
 {
         struct ocfs2_xattr_block *xb;
         int ret = 0;
@@ -1773,19 +1902,29 @@ static int ocfs2_xattr_block_remove(struct inode *inode,
                 .vb_bh = blk_bh,
                 .vb_access = ocfs2_journal_access_xb,
         };
+        struct ocfs2_rm_xattr_bucket_para args = {
+                .ref_ci = ref_ci,
+                .ref_root_bh = ref_root_bh,
+        };
 
         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
                 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
-                ret = ocfs2_remove_value_outside(inode, &vb, header);
+                ret = ocfs2_remove_value_outside(inode, &vb, header,
+                                                 ref_ci, ref_root_bh);
         } else
-                ret = ocfs2_delete_xattr_index_block(inode, blk_bh);
+                ret = ocfs2_iterate_xattr_index_block(inode,
+                                                blk_bh,
+                                                ocfs2_rm_xattr_cluster,
+                                                &args);
 
         return ret;
 }
 
 static int ocfs2_xattr_free_block(struct inode *inode,
-                                  u64 block)
+                                  u64 block,
+                                  struct ocfs2_caching_info *ref_ci,
+                                  struct buffer_head *ref_root_bh)
 {
         struct inode *xb_alloc_inode;
         struct buffer_head *xb_alloc_bh = NULL;
@@ -1803,7 +1942,7 @@ static int ocfs2_xattr_free_block(struct inode *inode,
                 goto out;
         }
 
-        ret = ocfs2_xattr_block_remove(inode, blk_bh);
+        ret = ocfs2_xattr_block_remove(inode, blk_bh, ref_ci, ref_root_bh);
         if (ret < 0) {
                 mlog_errno(ret);
                 goto out;
@@ -1863,6 +2002,9 @@ int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
 {
         struct ocfs2_inode_info *oi = OCFS2_I(inode);
         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+        struct ocfs2_refcount_tree *ref_tree = NULL;
+        struct buffer_head *ref_root_bh = NULL;
+        struct ocfs2_caching_info *ref_ci = NULL;
         handle_t *handle;
         int ret;
 
@@ -1872,8 +2014,21 @@ int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
                 return 0;
 
+        if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
+                ret = ocfs2_lock_refcount_tree(OCFS2_SB(inode->i_sb),
+                                               le64_to_cpu(di->i_refcount_loc),
+                                               1, &ref_tree, &ref_root_bh);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+                ref_ci = &ref_tree->rf_ci;
+
+        }
+
         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
-                ret = ocfs2_xattr_ibody_remove(inode, di_bh);
+                ret = ocfs2_xattr_ibody_remove(inode, di_bh,
+                                               ref_ci, ref_root_bh);
                 if (ret < 0) {
                         mlog_errno(ret);
                         goto out;
@@ -1882,7 +2037,8 @@ int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
 
         if (di->i_xattr_loc) {
                 ret = ocfs2_xattr_free_block(inode,
-                                             le64_to_cpu(di->i_xattr_loc));
+                                             le64_to_cpu(di->i_xattr_loc),
+                                             ref_ci, ref_root_bh);
                 if (ret < 0) {
                         mlog_errno(ret);
                         goto out;
@@ -1896,7 +2052,7 @@ int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
                 mlog_errno(ret);
                 goto out;
         }
-        ret = ocfs2_journal_access_di(handle, inode, di_bh,
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
@@ -1916,6 +2072,9 @@ int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
 out_commit:
         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 out:
+        if (ref_tree)
+                ocfs2_unlock_refcount_tree(OCFS2_SB(inode->i_sb), ref_tree, 1);
+        brelse(ref_root_bh);
         return ret;
 }
 
@@ -2083,6 +2242,84 @@ cleanup:
         return ret;
 }
 
+static int ocfs2_create_xattr_block(handle_t *handle,
+                                    struct inode *inode,
+                                    struct buffer_head *inode_bh,
+                                    struct ocfs2_alloc_context *meta_ac,
+                                    struct buffer_head **ret_bh,
+                                    int indexed)
+{
+        int ret;
+        u16 suballoc_bit_start;
+        u32 num_got;
+        u64 first_blkno;
+        struct ocfs2_dinode *di =  (struct ocfs2_dinode *)inode_bh->b_data;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct buffer_head *new_bh = NULL;
+        struct ocfs2_xattr_block *xblk;
+
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), inode_bh,
+                                      OCFS2_JOURNAL_ACCESS_CREATE);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto end;
+        }
+
+        ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
+                                   &suballoc_bit_start, &num_got,
+                                   &first_blkno);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto end;
+        }
+
+        new_bh = sb_getblk(inode->i_sb, first_blkno);
+        ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
+
+        ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode),
+                                      new_bh,
+                                      OCFS2_JOURNAL_ACCESS_CREATE);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto end;
+        }
+
+        /* Initialize ocfs2_xattr_block */
+        xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
+        memset(xblk, 0, inode->i_sb->s_blocksize);
+        strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
+        xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num);
+        xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
+        xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
+        xblk->xb_blkno = cpu_to_le64(first_blkno);
+
+        if (indexed) {
+                struct ocfs2_xattr_tree_root *xr = &xblk->xb_attrs.xb_root;
+                xr->xt_clusters = cpu_to_le32(1);
+                xr->xt_last_eb_blk = 0;
+                xr->xt_list.l_tree_depth = 0;
+                xr->xt_list.l_count = cpu_to_le16(
+                                        ocfs2_xattr_recs_per_xb(inode->i_sb));
+                xr->xt_list.l_next_free_rec = cpu_to_le16(1);
+                xblk->xb_flags = cpu_to_le16(OCFS2_XATTR_INDEXED);
+        }
+
+        ret = ocfs2_journal_dirty(handle, new_bh);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto end;
+        }
+        di->i_xattr_loc = cpu_to_le64(first_blkno);
+        ocfs2_journal_dirty(handle, inode_bh);
+
+        *ret_bh = new_bh;
+        new_bh = NULL;
+
+end:
+        brelse(new_bh);
+        return ret;
+}
+
 /*
  * ocfs2_xattr_block_set()
  *
@@ -2095,63 +2332,24 @@ static int ocfs2_xattr_block_set(struct inode *inode,
                                  struct ocfs2_xattr_set_ctxt *ctxt)
 {
         struct buffer_head *new_bh = NULL;
-        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
-        struct ocfs2_dinode *di =  (struct ocfs2_dinode *)xs->inode_bh->b_data;
         handle_t *handle = ctxt->handle;
         struct ocfs2_xattr_block *xblk = NULL;
-        u16 suballoc_bit_start;
-        u32 num_got;
-        u64 first_blkno;
         int ret;
 
         if (!xs->xattr_bh) {
-                ret = ocfs2_journal_access_di(handle, inode, xs->inode_bh,
-                                              OCFS2_JOURNAL_ACCESS_CREATE);
-                if (ret < 0) {
-                        mlog_errno(ret);
-                        goto end;
-                }
-
-                ret = ocfs2_claim_metadata(osb, handle, ctxt->meta_ac, 1,
-                                           &suballoc_bit_start, &num_got,
-                                           &first_blkno);
-                if (ret < 0) {
-                        mlog_errno(ret);
-                        goto end;
-                }
-
-                new_bh = sb_getblk(inode->i_sb, first_blkno);
-                ocfs2_set_new_buffer_uptodate(inode, new_bh);
-
-                ret = ocfs2_journal_access_xb(handle, inode, new_bh,
-                                              OCFS2_JOURNAL_ACCESS_CREATE);
-                if (ret < 0) {
+                ret = ocfs2_create_xattr_block(handle, inode, xs->inode_bh,
+                                               ctxt->meta_ac, &new_bh, 0);
+                if (ret) {
                         mlog_errno(ret);
                         goto end;
                 }
 
-                /* Initialize ocfs2_xattr_block */
                 xs->xattr_bh = new_bh;
-                xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
-                memset(xblk, 0, inode->i_sb->s_blocksize);
-                strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
-                xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num);
-                xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
-                xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
-                xblk->xb_blkno = cpu_to_le64(first_blkno);
-
+                xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
                 xs->header = &xblk->xb_attrs.xb_header;
                 xs->base = (void *)xs->header;
                 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
                 xs->here = xs->header->xh_entries;
-
-                ret = ocfs2_journal_dirty(handle, new_bh);
-                if (ret < 0) {
-                        mlog_errno(ret);
-                        goto end;
-                }
-                di->i_xattr_loc = cpu_to_le64(first_blkno);
-                ocfs2_journal_dirty(handle, xs->inode_bh);
         } else
                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
 
@@ -2273,7 +2471,7 @@ static int ocfs2_calc_xattr_set_need(struct inode *inode,
                 old_in_xb = 1;
 
                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
-                        ret = ocfs2_xattr_bucket_get_name_value(inode,
+                        ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
                                                         bucket_xh(xbs->bucket),
                                                         i, &block_off,
                                                         &name_offset);
@@ -2428,6 +2626,7 @@ static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
                                      struct ocfs2_xattr_search *xis,
                                      struct ocfs2_xattr_search *xbs,
                                      struct ocfs2_xattr_set_ctxt *ctxt,
+                                     int extra_meta,
                                      int *credits)
 {
         int clusters_add, meta_add, ret;
@@ -2444,6 +2643,7 @@ static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
                 return ret;
         }
 
+        meta_add += extra_meta;
         mlog(0, "Set xattr %s, reserve meta blocks = %d, clusters = %d, "
              "credits = %d\n", xi->name, meta_add, clusters_add, *credits);
 
@@ -2598,7 +2798,7 @@ static int __ocfs2_xattr_set_handle(struct inode *inode,
 
         if (!ret) {
                 /* Update inode ctime. */
-                ret = ocfs2_journal_access_di(ctxt->handle, inode,
+                ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
                                               xis->inode_bh,
                                               OCFS2_JOURNAL_ACCESS_WRITE);
                 if (ret) {
@@ -2711,10 +2911,11 @@ int ocfs2_xattr_set(struct inode *inode,
 {
         struct buffer_head *di_bh = NULL;
         struct ocfs2_dinode *di;
-        int ret, credits;
+        int ret, credits, ref_meta = 0, ref_credits = 0;
         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
         struct inode *tl_inode = osb->osb_tl_inode;
         struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
+        struct ocfs2_refcount_tree *ref_tree = NULL;
 
         struct ocfs2_xattr_info xi = {
                 .name_index = name_index,
@@ -2779,6 +2980,17 @@ int ocfs2_xattr_set(struct inode *inode,
                         goto cleanup;
         }
 
+        /* Check whether the value is refcounted and do some prepartion. */
+        if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL &&
+            (!xis.not_found || !xbs.not_found)) {
+                ret = ocfs2_prepare_refcount_xattr(inode, di, &xi,
+                                                   &xis, &xbs, &ref_tree,
+                                                   &ref_meta, &ref_credits);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto cleanup;
+                }
+        }
 
         mutex_lock(&tl_inode->i_mutex);
 
@@ -2793,7 +3005,7 @@ int ocfs2_xattr_set(struct inode *inode,
         mutex_unlock(&tl_inode->i_mutex);
 
         ret = ocfs2_init_xattr_set_ctxt(inode, di, &xi, &xis,
-                                        &xbs, &ctxt, &credits);
+                                        &xbs, &ctxt, ref_meta, &credits);
         if (ret) {
                 mlog_errno(ret);
                 goto cleanup;
@@ -2801,7 +3013,7 @@ int ocfs2_xattr_set(struct inode *inode,
 
         /* we need to update inode's ctime field, so add credit for it. */
         credits += OCFS2_INODE_UPDATE_CREDITS;
-        ctxt.handle = ocfs2_start_trans(osb, credits);
+        ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
         if (IS_ERR(ctxt.handle)) {
                 ret = PTR_ERR(ctxt.handle);
                 mlog_errno(ret);
@@ -2819,8 +3031,16 @@ int ocfs2_xattr_set(struct inode *inode,
         if (ocfs2_dealloc_has_cluster(&ctxt.dealloc))
                 ocfs2_schedule_truncate_log_flush(osb, 1);
         ocfs2_run_deallocs(osb, &ctxt.dealloc);
+
 cleanup:
+        if (ref_tree)
+                ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
         up_write(&OCFS2_I(inode)->ip_xattr_sem);
+        if (!value && !ret) {
+                ret = ocfs2_try_remove_refcount_tree(inode, di_bh);
+                if (ret)
+                        mlog_errno(ret);
+        }
         ocfs2_inode_unlock(inode, 1);
 cleanup_nolock:
         brelse(di_bh);
@@ -2849,7 +3069,8 @@ static int ocfs2_xattr_get_rec(struct inode *inode,
         u64 e_blkno = 0;
 
         if (el->l_tree_depth) {
-                ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh);
+                ret = ocfs2_find_leaf(INODE_CACHE(inode), el, name_hash,
+                                      &eb_bh);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -2931,7 +3152,7 @@ static int ocfs2_find_xe_in_bucket(struct inode *inode,
                 if (cmp)
                         continue;
 
-                ret = ocfs2_xattr_bucket_get_name_value(inode,
+                ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
                                                         xh,
                                                         i,
                                                         &block_off,
@@ -3175,7 +3396,7 @@ struct ocfs2_xattr_tree_list {
         size_t result;
 };
 
-static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
+static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
                                              struct ocfs2_xattr_header *xh,
                                              int index,
                                              int *block_off,
@@ -3188,8 +3409,8 @@ static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
 
         name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
 
-        *block_off = name_offset >> inode->i_sb->s_blocksize_bits;
-        *new_offset = name_offset % inode->i_sb->s_blocksize;
+        *block_off = name_offset >> sb->s_blocksize_bits;
+        *new_offset = name_offset % sb->s_blocksize;
 
         return 0;
 }
@@ -3209,7 +3430,7 @@ static int ocfs2_list_xattr_bucket(struct inode *inode,
                 prefix = ocfs2_xattr_prefix(type);
 
                 if (prefix) {
-                        ret = ocfs2_xattr_bucket_get_name_value(inode,
+                        ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
                                                                 bucket_xh(bucket),
                                                                 i,
                                                                 &block_off,
@@ -3232,22 +3453,19 @@ static int ocfs2_list_xattr_bucket(struct inode *inode,
         return ret;
 }
 
-static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
-                                             struct ocfs2_xattr_tree_root *xt,
-                                             char *buffer,
-                                             size_t buffer_size)
+static int ocfs2_iterate_xattr_index_block(struct inode *inode,
+                                           struct buffer_head *blk_bh,
+                                           xattr_tree_rec_func *rec_func,
+                                           void *para)
 {
-        struct ocfs2_extent_list *el = &xt->xt_list;
+        struct ocfs2_xattr_block *xb =
+                        (struct ocfs2_xattr_block *)blk_bh->b_data;
+        struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
         int ret = 0;
         u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
         u64 p_blkno = 0;
-        struct ocfs2_xattr_tree_list xl = {
-                .buffer = buffer,
-                .buffer_size = buffer_size,
-                .result = 0,
-        };
 
-        if (le16_to_cpu(el->l_next_free_rec) == 0)
+        if (!el->l_next_free_rec || !rec_func)
                 return 0;
 
         while (name_hash > 0) {
@@ -3255,16 +3473,15 @@ static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
                                           &e_cpos, &num_clusters, el);
                 if (ret) {
                         mlog_errno(ret);
-                        goto out;
+                        break;
                 }
 
-                ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
-                                                  ocfs2_list_xattr_bucket,
-                                                  &xl);
+                ret = rec_func(inode, blk_bh, p_blkno, e_cpos,
+                               num_clusters, para);
                 if (ret) {
                         if (ret != -ERANGE)
                                 mlog_errno(ret);
-                        goto out;
+                        break;
                 }
 
                 if (e_cpos == 0)
@@ -3273,6 +3490,37 @@ static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
                 name_hash = e_cpos - 1;
         }
 
+        return ret;
+
+}
+
+static int ocfs2_list_xattr_tree_rec(struct inode *inode,
+                                     struct buffer_head *root_bh,
+                                     u64 blkno, u32 cpos, u32 len, void *para)
+{
+        return ocfs2_iterate_xattr_buckets(inode, blkno, len,
+                                           ocfs2_list_xattr_bucket, para);
+}
+
+static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
+                                             struct buffer_head *blk_bh,
+                                             char *buffer,
+                                             size_t buffer_size)
+{
+        int ret;
+        struct ocfs2_xattr_tree_list xl = {
+                .buffer = buffer,
+                .buffer_size = buffer_size,
+                .result = 0,
+        };
+
+        ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
+                                              ocfs2_list_xattr_tree_rec, &xl);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
         ret = xl.result;
 out:
         return ret;
@@ -3426,7 +3674,7 @@ static int ocfs2_xattr_create_index_block(struct inode *inode,
          */
         down_write(&oi->ip_alloc_sem);
 
-        ret = ocfs2_journal_access_xb(handle, inode, xb_bh,
+        ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), xb_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
@@ -4263,9 +4511,9 @@ static int ocfs2_add_new_xattr_cluster(struct inode *inode,
              (unsigned long long)OCFS2_I(inode)->ip_blkno,
              prev_cpos, (unsigned long long)bucket_blkno(first));
 
-        ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
+        ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
 
-        ret = ocfs2_journal_access_xb(handle, inode, root_bh,
+        ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret < 0) {
                 mlog_errno(ret);
@@ -4319,7 +4567,7 @@ static int ocfs2_add_new_xattr_cluster(struct inode *inode,
 
         mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
              num_bits, (unsigned long long)block, v_start);
-        ret = ocfs2_insert_extent(osb, handle, inode, &et, v_start, block,
+        ret = ocfs2_insert_extent(handle, &et, v_start, block,
                                   num_bits, 0, ctxt->meta_ac);
         if (ret < 0) {
                 mlog_errno(ret);
@@ -4798,10 +5046,13 @@ static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
         struct ocfs2_xattr_entry *xe = xs->here;
         struct ocfs2_xattr_header *xh = bucket_xh(xs->bucket);
         void *base;
+        struct ocfs2_xattr_value_buf vb = {
+                .vb_access = ocfs2_journal_access,
+        };
 
         BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe));
 
-        ret = ocfs2_xattr_bucket_get_name_value(inode, xh,
+        ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb, xh,
                                                 xe - xh->xh_entries,
                                                 &block_off,
                                                 &offset);
@@ -4814,8 +5065,10 @@ static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
         xv = (struct ocfs2_xattr_value_root *)(base + offset +
                  OCFS2_XATTR_SIZE(xe->xe_name_len));
 
+        vb.vb_xv = xv;
+        vb.vb_bh = xs->bucket->bu_bhs[block_off];
         ret = __ocfs2_xattr_set_value_outside(inode, handle,
-                                              xv, val, value_len);
+                                              &vb, val, value_len);
         if (ret)
                 mlog_errno(ret);
 out:
@@ -4826,7 +5079,8 @@ static int ocfs2_rm_xattr_cluster(struct inode *inode,
                                   struct buffer_head *root_bh,
                                   u64 blkno,
                                   u32 cpos,
-                                  u32 len)
+                                  u32 len,
+                                  void *para)
 {
         int ret;
         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
@@ -4838,14 +5092,22 @@ static int ocfs2_rm_xattr_cluster(struct inode *inode,
         struct ocfs2_cached_dealloc_ctxt dealloc;
         struct ocfs2_extent_tree et;
 
-        ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
+        ret = ocfs2_iterate_xattr_buckets(inode, blkno, len,
+                                          ocfs2_delete_xattr_in_bucket, para);
+        if (ret) {
+                mlog_errno(ret);
+                return ret;
+        }
+
+        ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
 
         ocfs2_init_dealloc_ctxt(&dealloc);
 
         mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
              cpos, len, (unsigned long long)blkno);
 
-        ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len);
+        ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode), blkno,
+                                               len);
 
         ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
         if (ret) {
@@ -4870,14 +5132,14 @@ static int ocfs2_rm_xattr_cluster(struct inode *inode,
                 goto out;
         }
 
-        ret = ocfs2_journal_access_xb(handle, inode, root_bh,
+        ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
                 goto out_commit;
         }
 
-        ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
+        ret = ocfs2_remove_extent(handle, &et, cpos, len, meta_ac,
                                   &dealloc);
         if (ret) {
                 mlog_errno(ret);
@@ -5220,7 +5482,7 @@ static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
                                         struct ocfs2_xattr_bucket *bucket,
                                         void *para)
 {
-        int ret = 0;
+        int ret = 0, ref_credits;
         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
         u16 i;
         struct ocfs2_xattr_entry *xe;
@@ -5228,7 +5490,9 @@ static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
         struct ocfs2_xattr_set_ctxt ctxt = {NULL, NULL,};
         int credits = ocfs2_remove_extent_credits(osb->sb) +
                 ocfs2_blocks_per_xattr_bucket(inode->i_sb);
-
+        struct ocfs2_xattr_value_root *xv;
+        struct ocfs2_rm_xattr_bucket_para *args =
+                        (struct ocfs2_rm_xattr_bucket_para *)para;
 
         ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
 
@@ -5237,7 +5501,16 @@ static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
                 if (ocfs2_xattr_is_local(xe))
                         continue;
 
-                ctxt.handle = ocfs2_start_trans(osb, credits);
+                ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket,
+                                                      i, &xv, NULL);
+
+                ret = ocfs2_lock_xattr_remove_allocators(inode, xv,
+                                                         args->ref_ci,
+                                                         args->ref_root_bh,
+                                                         &ctxt.meta_ac,
+                                                         &ref_credits);
+
+                ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
                 if (IS_ERR(ctxt.handle)) {
                         ret = PTR_ERR(ctxt.handle);
                         mlog_errno(ret);
@@ -5248,57 +5521,1439 @@ static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
                                                         i, 0, &ctxt);
 
                 ocfs2_commit_trans(osb, ctxt.handle);
+                if (ctxt.meta_ac) {
+                        ocfs2_free_alloc_context(ctxt.meta_ac);
+                        ctxt.meta_ac = NULL;
+                }
                 if (ret) {
                         mlog_errno(ret);
                         break;
                 }
         }
 
+        if (ctxt.meta_ac)
+                ocfs2_free_alloc_context(ctxt.meta_ac);
         ocfs2_schedule_truncate_log_flush(osb, 1);
         ocfs2_run_deallocs(osb, &ctxt.dealloc);
         return ret;
 }
 
-static int ocfs2_delete_xattr_index_block(struct inode *inode,
-                                          struct buffer_head *xb_bh)
+/*
+ * Whenever we modify a xattr value root in the bucket(e.g, CoW
+ * or change the extent record flag), we need to recalculate
+ * the metaecc for the whole bucket. So it is done here.
+ *
+ * Note:
+ * We have to give the extra credits for the caller.
+ */
+static int ocfs2_xattr_bucket_post_refcount(struct inode *inode,
+                                            handle_t *handle,
+                                            void *para)
+{
+        int ret;
+        struct ocfs2_xattr_bucket *bucket =
+                        (struct ocfs2_xattr_bucket *)para;
+
+        ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
+                                                OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                return ret;
+        }
+
+        ocfs2_xattr_bucket_journal_dirty(handle, bucket);
+
+        return 0;
+}
+
+/*
+ * Special action we need if the xattr value is refcounted.
+ *
+ * 1. If the xattr is refcounted, lock the tree.
+ * 2. CoW the xattr if we are setting the new value and the value
+ *    will be stored outside.
+ * 3. In other case, decrease_refcount will work for us, so just
+ *    lock the refcount tree, calculate the meta and credits is OK.
+ *
+ * We have to do CoW before ocfs2_init_xattr_set_ctxt since
+ * currently CoW is a completed transaction, while this function
+ * will also lock the allocators and let us deadlock. So we will
+ * CoW the whole xattr value.
+ */
+static int ocfs2_prepare_refcount_xattr(struct inode *inode,
+                                        struct ocfs2_dinode *di,
+                                        struct ocfs2_xattr_info *xi,
+                                        struct ocfs2_xattr_search *xis,
+                                        struct ocfs2_xattr_search *xbs,
+                                        struct ocfs2_refcount_tree **ref_tree,
+                                        int *meta_add,
+                                        int *credits)
 {
-        struct ocfs2_xattr_block *xb =
-                        (struct ocfs2_xattr_block *)xb_bh->b_data;
-        struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
         int ret = 0;
-        u32 name_hash = UINT_MAX, e_cpos, num_clusters;
-        u64 p_blkno;
+        struct ocfs2_xattr_block *xb;
+        struct ocfs2_xattr_entry *xe;
+        char *base;
+        u32 p_cluster, num_clusters;
+        unsigned int ext_flags;
+        int name_offset, name_len;
+        struct ocfs2_xattr_value_buf vb;
+        struct ocfs2_xattr_bucket *bucket = NULL;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_post_refcount refcount;
+        struct ocfs2_post_refcount *p = NULL;
+        struct buffer_head *ref_root_bh = NULL;
 
-        if (le16_to_cpu(el->l_next_free_rec) == 0)
-                return 0;
+        if (!xis->not_found) {
+                xe = xis->here;
+                name_offset = le16_to_cpu(xe->xe_name_offset);
+                name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
+                base = xis->base;
+                vb.vb_bh = xis->inode_bh;
+                vb.vb_access = ocfs2_journal_access_di;
+        } else {
+                int i, block_off = 0;
+                xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
+                xe = xbs->here;
+                name_offset = le16_to_cpu(xe->xe_name_offset);
+                name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
+                i = xbs->here - xbs->header->xh_entries;
 
-        while (name_hash > 0) {
-                ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
-                                          &e_cpos, &num_clusters, el);
+                if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
+                        ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
+                                                        bucket_xh(xbs->bucket),
+                                                        i, &block_off,
+                                                        &name_offset);
+                        if (ret) {
+                                mlog_errno(ret);
+                                goto out;
+                        }
+                        base = bucket_block(xbs->bucket, block_off);
+                        vb.vb_bh = xbs->bucket->bu_bhs[block_off];
+                        vb.vb_access = ocfs2_journal_access;
+
+                        if (ocfs2_meta_ecc(osb)) {
+                                /*create parameters for ocfs2_post_refcount. */
+                                bucket = xbs->bucket;
+                                refcount.credits = bucket->bu_blocks;
+                                refcount.para = bucket;
+                                refcount.func =
+                                        ocfs2_xattr_bucket_post_refcount;
+                                p = &refcount;
+                        }
+                } else {
+                        base = xbs->base;
+                        vb.vb_bh = xbs->xattr_bh;
+                        vb.vb_access = ocfs2_journal_access_xb;
+                }
+        }
+
+        if (ocfs2_xattr_is_local(xe))
+                goto out;
+
+        vb.vb_xv = (struct ocfs2_xattr_value_root *)
+                                (base + name_offset + name_len);
+
+        ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
+                                       &num_clusters, &vb.vb_xv->xr_list,
+                                       &ext_flags);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        /*
+         * We just need to check the 1st extent record, since we always
+         * CoW the whole xattr. So there shouldn't be a xattr with
+         * some REFCOUNT extent recs after the 1st one.
+         */
+        if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
+                goto out;
+
+        ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
+                                       1, ref_tree, &ref_root_bh);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        /*
+         * If we are deleting the xattr or the new size will be stored inside,
+         * cool, leave it there, the xattr truncate process will remove them
+         * for us(it still needs the refcount tree lock and the meta, credits).
+         * And the worse case is that every cluster truncate will split the
+         * refcount tree, and make the original extent become 3. So we will need
+         * 2 * cluster more extent recs at most.
+         */
+        if (!xi->value || xi->value_len <= OCFS2_XATTR_INLINE_SIZE) {
+
+                ret = ocfs2_refcounted_xattr_delete_need(inode,
+                                                         &(*ref_tree)->rf_ci,
+                                                         ref_root_bh, vb.vb_xv,
+                                                         meta_add, credits);
+                if (ret)
+                        mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_refcount_cow_xattr(inode, di, &vb,
+                                       *ref_tree, ref_root_bh, 0,
+                                       le32_to_cpu(vb.vb_xv->xr_clusters), p);
+        if (ret)
+                mlog_errno(ret);
+
+out:
+        brelse(ref_root_bh);
+        return ret;
+}
+
+/*
+ * Add the REFCOUNTED flags for all the extent rec in ocfs2_xattr_value_root.
+ * The physical clusters will be added to refcount tree.
+ */
+static int ocfs2_xattr_value_attach_refcount(struct inode *inode,
+                                struct ocfs2_xattr_value_root *xv,
+                                struct ocfs2_extent_tree *value_et,
+                                struct ocfs2_caching_info *ref_ci,
+                                struct buffer_head *ref_root_bh,
+                                struct ocfs2_cached_dealloc_ctxt *dealloc,
+                                struct ocfs2_post_refcount *refcount)
+{
+        int ret = 0;
+        u32 clusters = le32_to_cpu(xv->xr_clusters);
+        u32 cpos, p_cluster, num_clusters;
+        struct ocfs2_extent_list *el = &xv->xr_list;
+        unsigned int ext_flags;
+
+        cpos = 0;
+        while (cpos < clusters) {
+                ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
+                                               &num_clusters, el, &ext_flags);
+
+                cpos += num_clusters;
+                if ((ext_flags & OCFS2_EXT_REFCOUNTED))
+                        continue;
+
+                BUG_ON(!p_cluster);
+
+                ret = ocfs2_add_refcount_flag(inode, value_et,
+                                              ref_ci, ref_root_bh,
+                                              cpos - num_clusters,
+                                              p_cluster, num_clusters,
+                                              dealloc, refcount);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+        }
+
+        return ret;
+}
+
+/*
+ * Given a normal ocfs2_xattr_header, refcount all the entries which
+ * have value stored outside.
+ * Used for xattrs stored in inode and ocfs2_xattr_block.
+ */
+static int ocfs2_xattr_attach_refcount_normal(struct inode *inode,
+                                struct ocfs2_xattr_value_buf *vb,
+                                struct ocfs2_xattr_header *header,
+                                struct ocfs2_caching_info *ref_ci,
+                                struct buffer_head *ref_root_bh,
+                                struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+
+        struct ocfs2_xattr_entry *xe;
+        struct ocfs2_xattr_value_root *xv;
+        struct ocfs2_extent_tree et;
+        int i, ret = 0;
+
+        for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
+                xe = &header->xh_entries[i];
+
+                if (ocfs2_xattr_is_local(xe))
+                        continue;
+
+                xv = (struct ocfs2_xattr_value_root *)((void *)header +
+                        le16_to_cpu(xe->xe_name_offset) +
+                        OCFS2_XATTR_SIZE(xe->xe_name_len));
+
+                vb->vb_xv = xv;
+                ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
+
+                ret = ocfs2_xattr_value_attach_refcount(inode, xv, &et,
+                                                        ref_ci, ref_root_bh,
+                                                        dealloc, NULL);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+        }
+
+        return ret;
+}
+
+static int ocfs2_xattr_inline_attach_refcount(struct inode *inode,
+                                struct buffer_head *fe_bh,
+                                struct ocfs2_caching_info *ref_ci,
+                                struct buffer_head *ref_root_bh,
+                                struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
+        struct ocfs2_xattr_header *header = (struct ocfs2_xattr_header *)
+                                (fe_bh->b_data + inode->i_sb->s_blocksize -
+                                le16_to_cpu(di->i_xattr_inline_size));
+        struct ocfs2_xattr_value_buf vb = {
+                .vb_bh = fe_bh,
+                .vb_access = ocfs2_journal_access_di,
+        };
+
+        return ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
+                                                  ref_ci, ref_root_bh, dealloc);
+}
+
+struct ocfs2_xattr_tree_value_refcount_para {
+        struct ocfs2_caching_info *ref_ci;
+        struct buffer_head *ref_root_bh;
+        struct ocfs2_cached_dealloc_ctxt *dealloc;
+};
+
+static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
+                                           struct ocfs2_xattr_bucket *bucket,
+                                           int offset,
+                                           struct ocfs2_xattr_value_root **xv,
+                                           struct buffer_head **bh)
+{
+        int ret, block_off, name_offset;
+        struct ocfs2_xattr_header *xh = bucket_xh(bucket);
+        struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
+        void *base;
+
+        ret = ocfs2_xattr_bucket_get_name_value(sb,
+                                                bucket_xh(bucket),
+                                                offset,
+                                                &block_off,
+                                                &name_offset);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        base = bucket_block(bucket, block_off);
+
+        *xv = (struct ocfs2_xattr_value_root *)(base + name_offset +
+                         OCFS2_XATTR_SIZE(xe->xe_name_len));
+
+        if (bh)
+                *bh = bucket->bu_bhs[block_off];
+out:
+        return ret;
+}
+
+/*
+ * For a given xattr bucket, refcount all the entries which
+ * have value stored outside.
+ */
+static int ocfs2_xattr_bucket_value_refcount(struct inode *inode,
+                                             struct ocfs2_xattr_bucket *bucket,
+                                             void *para)
+{
+        int i, ret = 0;
+        struct ocfs2_extent_tree et;
+        struct ocfs2_xattr_tree_value_refcount_para *ref =
+                        (struct ocfs2_xattr_tree_value_refcount_para *)para;
+        struct ocfs2_xattr_header *xh =
+                        (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
+        struct ocfs2_xattr_entry *xe;
+        struct ocfs2_xattr_value_buf vb = {
+                .vb_access = ocfs2_journal_access,
+        };
+        struct ocfs2_post_refcount refcount = {
+                .credits = bucket->bu_blocks,
+                .para = bucket,
+                .func = ocfs2_xattr_bucket_post_refcount,
+        };
+        struct ocfs2_post_refcount *p = NULL;
+
+        /* We only need post_refcount if we support metaecc. */
+        if (ocfs2_meta_ecc(OCFS2_SB(inode->i_sb)))
+                p = &refcount;
+
+        mlog(0, "refcount bucket %llu, count = %u\n",
+             (unsigned long long)bucket_blkno(bucket),
+             le16_to_cpu(xh->xh_count));
+        for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
+                xe = &xh->xh_entries[i];
+
+                if (ocfs2_xattr_is_local(xe))
+                        continue;
+
+                ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket, i,
+                                                      &vb.vb_xv, &vb.vb_bh);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+
+                ocfs2_init_xattr_value_extent_tree(&et,
+                                                   INODE_CACHE(inode), &vb);
+
+                ret = ocfs2_xattr_value_attach_refcount(inode, vb.vb_xv,
+                                                        &et, ref->ref_ci,
+                                                        ref->ref_root_bh,
+                                                        ref->dealloc, p);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+        }
+
+        return ret;
+
+}
+
+static int ocfs2_refcount_xattr_tree_rec(struct inode *inode,
+                                     struct buffer_head *root_bh,
+                                     u64 blkno, u32 cpos, u32 len, void *para)
+{
+        return ocfs2_iterate_xattr_buckets(inode, blkno, len,
+                                           ocfs2_xattr_bucket_value_refcount,
+                                           para);
+}
+
+static int ocfs2_xattr_block_attach_refcount(struct inode *inode,
+                                struct buffer_head *blk_bh,
+                                struct ocfs2_caching_info *ref_ci,
+                                struct buffer_head *ref_root_bh,
+                                struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+        int ret = 0;
+        struct ocfs2_xattr_block *xb =
+                                (struct ocfs2_xattr_block *)blk_bh->b_data;
+
+        if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
+                struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
+                struct ocfs2_xattr_value_buf vb = {
+                        .vb_bh = blk_bh,
+                        .vb_access = ocfs2_journal_access_xb,
+                };
+
+                ret = ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
+                                                         ref_ci, ref_root_bh,
+                                                         dealloc);
+        } else {
+                struct ocfs2_xattr_tree_value_refcount_para para = {
+                        .ref_ci = ref_ci,
+                        .ref_root_bh = ref_root_bh,
+                        .dealloc = dealloc,
+                };
+
+                ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
+                                                ocfs2_refcount_xattr_tree_rec,
+                                                &para);
+        }
+
+        return ret;
+}
+
+int ocfs2_xattr_attach_refcount_tree(struct inode *inode,
+                                     struct buffer_head *fe_bh,
+                                     struct ocfs2_caching_info *ref_ci,
+                                     struct buffer_head *ref_root_bh,
+                                     struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+        int ret = 0;
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
+        struct buffer_head *blk_bh = NULL;
+
+        if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
+                ret = ocfs2_xattr_inline_attach_refcount(inode, fe_bh,
+                                                         ref_ci, ref_root_bh,
+                                                         dealloc);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
                 }
+        }
+
+        if (!di->i_xattr_loc)
+                goto out;
+
+        ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
+                                     &blk_bh);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_xattr_block_attach_refcount(inode, blk_bh, ref_ci,
+                                                ref_root_bh, dealloc);
+        if (ret)
+                mlog_errno(ret);
+
+        brelse(blk_bh);
+out:
+
+        return ret;
+}
+
+typedef int (should_xattr_reflinked)(struct ocfs2_xattr_entry *xe);
+/*
+ * Store the information we need in xattr reflink.
+ * old_bh and new_bh are inode bh for the old and new inode.
+ */
+struct ocfs2_xattr_reflink {
+        struct inode *old_inode;
+        struct inode *new_inode;
+        struct buffer_head *old_bh;
+        struct buffer_head *new_bh;
+        struct ocfs2_caching_info *ref_ci;
+        struct buffer_head *ref_root_bh;
+        struct ocfs2_cached_dealloc_ctxt *dealloc;
+        should_xattr_reflinked *xattr_reflinked;
+};
+
+/*
+ * Given a xattr header and xe offset,
+ * return the proper xv and the corresponding bh.
+ * xattr in inode, block and xattr tree have different implementaions.
+ */
+typedef int (get_xattr_value_root)(struct super_block *sb,
+                                   struct buffer_head *bh,
+                                   struct ocfs2_xattr_header *xh,
+                                   int offset,
+                                   struct ocfs2_xattr_value_root **xv,
+                                   struct buffer_head **ret_bh,
+                                   void *para);
+
+/*
+ * Calculate all the xattr value root metadata stored in this xattr header and
+ * credits we need if we create them from the scratch.
+ * We use get_xattr_value_root so that all types of xattr container can use it.
+ */
+static int ocfs2_value_metas_in_xattr_header(struct super_block *sb,
+                                             struct buffer_head *bh,
+                                             struct ocfs2_xattr_header *xh,
+                                             int *metas, int *credits,
+                                             int *num_recs,
+                                             get_xattr_value_root *func,
+                                             void *para)
+{
+        int i, ret = 0;
+        struct ocfs2_xattr_value_root *xv;
+        struct ocfs2_xattr_entry *xe;
+
+        for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
+                xe = &xh->xh_entries[i];
+                if (ocfs2_xattr_is_local(xe))
+                        continue;
+
+                ret = func(sb, bh, xh, i, &xv, NULL, para);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+
+                *metas += le16_to_cpu(xv->xr_list.l_tree_depth) *
+                          le16_to_cpu(xv->xr_list.l_next_free_rec);
+
+                *credits += ocfs2_calc_extend_credits(sb,
+                                                &def_xv.xv.xr_list,
+                                                le32_to_cpu(xv->xr_clusters));
+
+                /*
+                 * If the value is a tree with depth > 1, We don't go deep
+                 * to the extent block, so just calculate a maximum record num.
+                 */
+                if (!xv->xr_list.l_tree_depth)
+                        *num_recs += xv->xr_list.l_next_free_rec;
+                else
+                        *num_recs += ocfs2_clusters_for_bytes(sb,
+                                                              XATTR_SIZE_MAX);
+        }
+
+        return ret;
+}
+
+/* Used by xattr inode and block to return the right xv and buffer_head. */
+static int ocfs2_get_xattr_value_root(struct super_block *sb,
+                                      struct buffer_head *bh,
+                                      struct ocfs2_xattr_header *xh,
+                                      int offset,
+                                      struct ocfs2_xattr_value_root **xv,
+                                      struct buffer_head **ret_bh,
+                                      void *para)
+{
+        struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
+
+        *xv = (struct ocfs2_xattr_value_root *)((void *)xh +
+                le16_to_cpu(xe->xe_name_offset) +
+                OCFS2_XATTR_SIZE(xe->xe_name_len));
+
+        if (ret_bh)
+                *ret_bh = bh;
+
+        return 0;
+}
+
+/*
+ * Lock the meta_ac and caculate how much credits we need for reflink xattrs.
+ * It is only used for inline xattr and xattr block.
+ */
+static int ocfs2_reflink_lock_xattr_allocators(struct ocfs2_super *osb,
+                                        struct ocfs2_xattr_header *xh,
+                                        struct buffer_head *ref_root_bh,
+                                        int *credits,
+                                        struct ocfs2_alloc_context **meta_ac)
+{
+        int ret, meta_add = 0, num_recs = 0;
+        struct ocfs2_refcount_block *rb =
+                        (struct ocfs2_refcount_block *)ref_root_bh->b_data;
+
+        *credits = 0;
+
+        ret = ocfs2_value_metas_in_xattr_header(osb->sb, NULL, xh,
+                                                &meta_add, credits, &num_recs,
+                                                ocfs2_get_xattr_value_root,
+                                                NULL);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        /*
+         * We need to add/modify num_recs in refcount tree, so just calculate
+         * an approximate number we need for refcount tree change.
+         * Sometimes we need to split the tree, and after split,  half recs
+         * will be moved to the new block, and a new block can only provide
+         * half number of recs. So we multiple new blocks by 2.
+         */
+        num_recs = num_recs / ocfs2_refcount_recs_per_rb(osb->sb) * 2;
+        meta_add += num_recs;
+        *credits += num_recs + num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
+        if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
+                *credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
+                            le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
+        else
+                *credits += 1;
+
+        ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add, meta_ac);
+        if (ret)
+                mlog_errno(ret);
+
+out:
+        return ret;
+}
 
-                ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
-                                                  ocfs2_delete_xattr_in_bucket,
-                                                  NULL);
+/*
+ * Given a xattr header, reflink all the xattrs in this container.
+ * It can be used for inode, block and bucket.
+ *
+ * NOTE:
+ * Before we call this function, the caller has memcpy the xattr in
+ * old_xh to the new_xh.
+ *
+ * If args.xattr_reflinked is set, call it to decide whether the xe should
+ * be reflinked or not. If not, remove it from the new xattr header.
+ */
+static int ocfs2_reflink_xattr_header(handle_t *handle,
+                                      struct ocfs2_xattr_reflink *args,
+                                      struct buffer_head *old_bh,
+                                      struct ocfs2_xattr_header *xh,
+                                      struct buffer_head *new_bh,
+                                      struct ocfs2_xattr_header *new_xh,
+                                      struct ocfs2_xattr_value_buf *vb,
+                                      struct ocfs2_alloc_context *meta_ac,
+                                      get_xattr_value_root *func,
+                                      void *para)
+{
+        int ret = 0, i, j;
+        struct super_block *sb = args->old_inode->i_sb;
+        struct buffer_head *value_bh;
+        struct ocfs2_xattr_entry *xe, *last;
+        struct ocfs2_xattr_value_root *xv, *new_xv;
+        struct ocfs2_extent_tree data_et;
+        u32 clusters, cpos, p_cluster, num_clusters;
+        unsigned int ext_flags = 0;
+
+        mlog(0, "reflink xattr in container %llu, count = %u\n",
+             (unsigned long long)old_bh->b_blocknr, le16_to_cpu(xh->xh_count));
+
+        last = &new_xh->xh_entries[le16_to_cpu(new_xh->xh_count)];
+        for (i = 0, j = 0; i < le16_to_cpu(xh->xh_count); i++, j++) {
+                xe = &xh->xh_entries[i];
+
+                if (args->xattr_reflinked && !args->xattr_reflinked(xe)) {
+                        xe = &new_xh->xh_entries[j];
+
+                        le16_add_cpu(&new_xh->xh_count, -1);
+                        if (new_xh->xh_count) {
+                                memmove(xe, xe + 1,
+                                        (void *)last - (void *)xe);
+                                memset(last, 0,
+                                       sizeof(struct ocfs2_xattr_entry));
+                        }
+
+                        /*
+                         * We don't want j to increase in the next round since
+                         * it is already moved ahead.
+                         */
+                        j--;
+                        continue;
+                }
+
+                if (ocfs2_xattr_is_local(xe))
+                        continue;
+
+                ret = func(sb, old_bh, xh, i, &xv, NULL, para);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+
+                ret = func(sb, new_bh, new_xh, j, &new_xv, &value_bh, para);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+
+                /*
+                 * For the xattr which has l_tree_depth = 0, all the extent
+                 * recs have already be copied to the new xh with the
+                 * propriate OCFS2_EXT_REFCOUNTED flag we just need to
+                 * increase the refount count int the refcount tree.
+                 *
+                 * For the xattr which has l_tree_depth > 0, we need
+                 * to initialize it to the empty default value root,
+                 * and then insert the extents one by one.
+                 */
+                if (xv->xr_list.l_tree_depth) {
+                        memcpy(new_xv, &def_xv, sizeof(def_xv));
+                        vb->vb_xv = new_xv;
+                        vb->vb_bh = value_bh;
+                        ocfs2_init_xattr_value_extent_tree(&data_et,
+                                        INODE_CACHE(args->new_inode), vb);
+                }
+
+                clusters = le32_to_cpu(xv->xr_clusters);
+                cpos = 0;
+                while (cpos < clusters) {
+                        ret = ocfs2_xattr_get_clusters(args->old_inode,
+                                                       cpos,
+                                                       &p_cluster,
+                                                       &num_clusters,
+                                                       &xv->xr_list,
+                                                       &ext_flags);
+                        if (ret) {
+                                mlog_errno(ret);
+                                goto out;
+                        }
+
+                        BUG_ON(!p_cluster);
+
+                        if (xv->xr_list.l_tree_depth) {
+                                ret = ocfs2_insert_extent(handle,
+                                                &data_et, cpos,
+                                                ocfs2_clusters_to_blocks(
+                                                        args->old_inode->i_sb,
+                                                        p_cluster),
+                                                num_clusters, ext_flags,
+                                                meta_ac);
+                                if (ret) {
+                                        mlog_errno(ret);
+                                        goto out;
+                                }
+                        }
+
+                        ret = ocfs2_increase_refcount(handle, args->ref_ci,
+                                                      args->ref_root_bh,
+                                                      p_cluster, num_clusters,
+                                                      meta_ac, args->dealloc);
+                        if (ret) {
+                                mlog_errno(ret);
+                                goto out;
+                        }
+
+                        cpos += num_clusters;
+                }
+        }
+
+out:
+        return ret;
+}
+
+static int ocfs2_reflink_xattr_inline(struct ocfs2_xattr_reflink *args)
+{
+        int ret = 0, credits = 0;
+        handle_t *handle;
+        struct ocfs2_super *osb = OCFS2_SB(args->old_inode->i_sb);
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)args->old_bh->b_data;
+        int inline_size = le16_to_cpu(di->i_xattr_inline_size);
+        int header_off = osb->sb->s_blocksize - inline_size;
+        struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)
+                                        (args->old_bh->b_data + header_off);
+        struct ocfs2_xattr_header *new_xh = (struct ocfs2_xattr_header *)
+                                        (args->new_bh->b_data + header_off);
+        struct ocfs2_alloc_context *meta_ac = NULL;
+        struct ocfs2_inode_info *new_oi;
+        struct ocfs2_dinode *new_di;
+        struct ocfs2_xattr_value_buf vb = {
+                .vb_bh = args->new_bh,
+                .vb_access = ocfs2_journal_access_di,
+        };
+
+        ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
+                                                  &credits, &meta_ac);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        handle = ocfs2_start_trans(osb, credits);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_journal_access_di(handle, INODE_CACHE(args->new_inode),
+                                      args->new_bh, OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        memcpy(args->new_bh->b_data + header_off,
+               args->old_bh->b_data + header_off, inline_size);
+
+        new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
+        new_di->i_xattr_inline_size = cpu_to_le16(inline_size);
+
+        ret = ocfs2_reflink_xattr_header(handle, args, args->old_bh, xh,
+                                         args->new_bh, new_xh, &vb, meta_ac,
+                                         ocfs2_get_xattr_value_root, NULL);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        new_oi = OCFS2_I(args->new_inode);
+        spin_lock(&new_oi->ip_lock);
+        new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL | OCFS2_INLINE_XATTR_FL;
+        new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
+        spin_unlock(&new_oi->ip_lock);
+
+        ocfs2_journal_dirty(handle, args->new_bh);
+
+out_commit:
+        ocfs2_commit_trans(osb, handle);
+
+out:
+        if (meta_ac)
+                ocfs2_free_alloc_context(meta_ac);
+        return ret;
+}
+
+static int ocfs2_create_empty_xattr_block(struct inode *inode,
+                                          struct buffer_head *fe_bh,
+                                          struct buffer_head **ret_bh,
+                                          int indexed)
+{
+        int ret;
+        handle_t *handle;
+        struct ocfs2_alloc_context *meta_ac;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+        ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
+        if (ret < 0) {
+                mlog_errno(ret);
+                return ret;
+        }
+
+        handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_CREATE_CREDITS);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out;
+        }
+
+        mlog(0, "create new xattr block for inode %llu, index = %d\n",
+             (unsigned long long)fe_bh->b_blocknr, indexed);
+        ret = ocfs2_create_xattr_block(handle, inode, fe_bh,
+                                       meta_ac, ret_bh, indexed);
+        if (ret)
+                mlog_errno(ret);
+
+        ocfs2_commit_trans(osb, handle);
+out:
+        ocfs2_free_alloc_context(meta_ac);
+        return ret;
+}
+
+static int ocfs2_reflink_xattr_block(struct ocfs2_xattr_reflink *args,
+                                     struct buffer_head *blk_bh,
+                                     struct buffer_head *new_blk_bh)
+{
+        int ret = 0, credits = 0;
+        handle_t *handle;
+        struct ocfs2_inode_info *new_oi = OCFS2_I(args->new_inode);
+        struct ocfs2_dinode *new_di;
+        struct ocfs2_super *osb = OCFS2_SB(args->new_inode->i_sb);
+        int header_off = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
+        struct ocfs2_xattr_block *xb =
+                        (struct ocfs2_xattr_block *)blk_bh->b_data;
+        struct ocfs2_xattr_header *xh = &xb->xb_attrs.xb_header;
+        struct ocfs2_xattr_block *new_xb =
+                        (struct ocfs2_xattr_block *)new_blk_bh->b_data;
+        struct ocfs2_xattr_header *new_xh = &new_xb->xb_attrs.xb_header;
+        struct ocfs2_alloc_context *meta_ac;
+        struct ocfs2_xattr_value_buf vb = {
+                .vb_bh = new_blk_bh,
+                .vb_access = ocfs2_journal_access_xb,
+        };
+
+        ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
+                                                  &credits, &meta_ac);
+        if (ret) {
+                mlog_errno(ret);
+                return ret;
+        }
+
+        /* One more credits in case we need to add xattr flags in new inode. */
+        handle = ocfs2_start_trans(osb, credits + 1);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out;
+        }
+
+        if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
+                ret = ocfs2_journal_access_di(handle,
+                                              INODE_CACHE(args->new_inode),
+                                              args->new_bh,
+                                              OCFS2_JOURNAL_ACCESS_WRITE);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out_commit;
+                }
+        }
+
+        ret = ocfs2_journal_access_xb(handle, INODE_CACHE(args->new_inode),
+                                      new_blk_bh, OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        memcpy(new_blk_bh->b_data + header_off, blk_bh->b_data + header_off,
+               osb->sb->s_blocksize - header_off);
+
+        ret = ocfs2_reflink_xattr_header(handle, args, blk_bh, xh,
+                                         new_blk_bh, new_xh, &vb, meta_ac,
+                                         ocfs2_get_xattr_value_root, NULL);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        ocfs2_journal_dirty(handle, new_blk_bh);
+
+        if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
+                new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
+                spin_lock(&new_oi->ip_lock);
+                new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
+                new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
+                spin_unlock(&new_oi->ip_lock);
+
+                ocfs2_journal_dirty(handle, args->new_bh);
+        }
+
+out_commit:
+        ocfs2_commit_trans(osb, handle);
+
+out:
+        ocfs2_free_alloc_context(meta_ac);
+        return ret;
+}
+
+struct ocfs2_reflink_xattr_tree_args {
+        struct ocfs2_xattr_reflink *reflink;
+        struct buffer_head *old_blk_bh;
+        struct buffer_head *new_blk_bh;
+        struct ocfs2_xattr_bucket *old_bucket;
+        struct ocfs2_xattr_bucket *new_bucket;
+};
+
+/*
+ * NOTE:
+ * We have to handle the case that both old bucket and new bucket
+ * will call this function to get the right ret_bh.
+ * So The caller must give us the right bh.
+ */
+static int ocfs2_get_reflink_xattr_value_root(struct super_block *sb,
+                                        struct buffer_head *bh,
+                                        struct ocfs2_xattr_header *xh,
+                                        int offset,
+                                        struct ocfs2_xattr_value_root **xv,
+                                        struct buffer_head **ret_bh,
+                                        void *para)
+{
+        struct ocfs2_reflink_xattr_tree_args *args =
+                        (struct ocfs2_reflink_xattr_tree_args *)para;
+        struct ocfs2_xattr_bucket *bucket;
+
+        if (bh == args->old_bucket->bu_bhs[0])
+                bucket = args->old_bucket;
+        else
+                bucket = args->new_bucket;
+
+        return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
+                                               xv, ret_bh);
+}
+
+struct ocfs2_value_tree_metas {
+        int num_metas;
+        int credits;
+        int num_recs;
+};
+
+static int ocfs2_value_tree_metas_in_bucket(struct super_block *sb,
+                                        struct buffer_head *bh,
+                                        struct ocfs2_xattr_header *xh,
+                                        int offset,
+                                        struct ocfs2_xattr_value_root **xv,
+                                        struct buffer_head **ret_bh,
+                                        void *para)
+{
+        struct ocfs2_xattr_bucket *bucket =
+                                (struct ocfs2_xattr_bucket *)para;
+
+        return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
+                                               xv, ret_bh);
+}
+
+static int ocfs2_calc_value_tree_metas(struct inode *inode,
+                                      struct ocfs2_xattr_bucket *bucket,
+                                      void *para)
+{
+        struct ocfs2_value_tree_metas *metas =
+                        (struct ocfs2_value_tree_metas *)para;
+        struct ocfs2_xattr_header *xh =
+                        (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
+
+        /* Add the credits for this bucket first. */
+        metas->credits += bucket->bu_blocks;
+        return ocfs2_value_metas_in_xattr_header(inode->i_sb, bucket->bu_bhs[0],
+                                        xh, &metas->num_metas,
+                                        &metas->credits, &metas->num_recs,
+                                        ocfs2_value_tree_metas_in_bucket,
+                                        bucket);
+}
+
+/*
+ * Given a xattr extent rec starting from blkno and having len clusters,
+ * iterate all the buckets calculate how much metadata we need for reflinking
+ * all the ocfs2_xattr_value_root and lock the allocators accordingly.
+ */
+static int ocfs2_lock_reflink_xattr_rec_allocators(
+                                struct ocfs2_reflink_xattr_tree_args *args,
+                                struct ocfs2_extent_tree *xt_et,
+                                u64 blkno, u32 len, int *credits,
+                                struct ocfs2_alloc_context **meta_ac,
+                                struct ocfs2_alloc_context **data_ac)
+{
+        int ret, num_free_extents;
+        struct ocfs2_value_tree_metas metas;
+        struct ocfs2_super *osb = OCFS2_SB(args->reflink->old_inode->i_sb);
+        struct ocfs2_refcount_block *rb;
+
+        memset(&metas, 0, sizeof(metas));
+
+        ret = ocfs2_iterate_xattr_buckets(args->reflink->old_inode, blkno, len,
+                                          ocfs2_calc_value_tree_metas, &metas);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        *credits = metas.credits;
+
+        /*
+         * Calculate we need for refcount tree change.
+         *
+         * We need to add/modify num_recs in refcount tree, so just calculate
+         * an approximate number we need for refcount tree change.
+         * Sometimes we need to split the tree, and after split,  half recs
+         * will be moved to the new block, and a new block can only provide
+         * half number of recs. So we multiple new blocks by 2.
+         * In the end, we have to add credits for modifying the already
+         * existed refcount block.
+         */
+        rb = (struct ocfs2_refcount_block *)args->reflink->ref_root_bh->b_data;
+        metas.num_recs =
+                (metas.num_recs + ocfs2_refcount_recs_per_rb(osb->sb) - 1) /
+                 ocfs2_refcount_recs_per_rb(osb->sb) * 2;
+        metas.num_metas += metas.num_recs;
+        *credits += metas.num_recs +
+                    metas.num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
+        if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
+                *credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
+                            le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
+        else
+                *credits += 1;
+
+        /* count in the xattr tree change. */
+        num_free_extents = ocfs2_num_free_extents(osb, xt_et);
+        if (num_free_extents < 0) {
+                ret = num_free_extents;
+                mlog_errno(ret);
+                goto out;
+        }
+
+        if (num_free_extents < len)
+                metas.num_metas += ocfs2_extend_meta_needed(xt_et->et_root_el);
+
+        *credits += ocfs2_calc_extend_credits(osb->sb,
+                                              xt_et->et_root_el, len);
+
+        if (metas.num_metas) {
+                ret = ocfs2_reserve_new_metadata_blocks(osb, metas.num_metas,
+                                                        meta_ac);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
                 }
+        }
 
-                ret = ocfs2_rm_xattr_cluster(inode, xb_bh,
-                                             p_blkno, e_cpos, num_clusters);
+        if (len) {
+                ret = ocfs2_reserve_clusters(osb, len, data_ac);
+                if (ret)
+                        mlog_errno(ret);
+        }
+out:
+        if (ret) {
+                if (*meta_ac) {
+                        ocfs2_free_alloc_context(*meta_ac);
+                        meta_ac = NULL;
+                }
+        }
+
+        return ret;
+}
+
+static int ocfs2_reflink_xattr_buckets(handle_t *handle,
+                                u64 blkno, u64 new_blkno, u32 clusters,
+                                struct ocfs2_alloc_context *meta_ac,
+                                struct ocfs2_alloc_context *data_ac,
+                                struct ocfs2_reflink_xattr_tree_args *args)
+{
+        int i, j, ret = 0;
+        struct super_block *sb = args->reflink->old_inode->i_sb;
+        u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(sb));
+        u32 num_buckets = clusters * bpc;
+        int bpb = args->old_bucket->bu_blocks;
+        struct ocfs2_xattr_value_buf vb = {
+                .vb_access = ocfs2_journal_access,
+        };
+
+        for (i = 0; i < num_buckets; i++, blkno += bpb, new_blkno += bpb) {
+                ret = ocfs2_read_xattr_bucket(args->old_bucket, blkno);
                 if (ret) {
                         mlog_errno(ret);
                         break;
                 }
 
-                if (e_cpos == 0)
+                ret = ocfs2_init_xattr_bucket(args->new_bucket, new_blkno);
+                if (ret) {
+                        mlog_errno(ret);
                         break;
+                }
 
-                name_hash = e_cpos - 1;
+                /*
+                 * The real bucket num in this series of blocks is stored
+                 * in the 1st bucket.
+                 */
+                if (i == 0)
+                        num_buckets = le16_to_cpu(
+                                bucket_xh(args->old_bucket)->xh_num_buckets);
+
+                ret = ocfs2_xattr_bucket_journal_access(handle,
+                                                args->new_bucket,
+                                                OCFS2_JOURNAL_ACCESS_CREATE);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+
+                for (j = 0; j < bpb; j++)
+                        memcpy(bucket_block(args->new_bucket, j),
+                               bucket_block(args->old_bucket, j),
+                               sb->s_blocksize);
+
+                ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
+
+                ret = ocfs2_reflink_xattr_header(handle, args->reflink,
+                                        args->old_bucket->bu_bhs[0],
+                                        bucket_xh(args->old_bucket),
+                                        args->new_bucket->bu_bhs[0],
+                                        bucket_xh(args->new_bucket),
+                                        &vb, meta_ac,
+                                        ocfs2_get_reflink_xattr_value_root,
+                                        args);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+
+                /*
+                 * Re-access and dirty the bucket to calculate metaecc.
+                 * Because we may extend the transaction in reflink_xattr_header
+                 * which will let the already accessed block gone.
+                 */
+                ret = ocfs2_xattr_bucket_journal_access(handle,
+                                                args->new_bucket,
+                                                OCFS2_JOURNAL_ACCESS_WRITE);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+
+                ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
+                ocfs2_xattr_bucket_relse(args->old_bucket);
+                ocfs2_xattr_bucket_relse(args->new_bucket);
+        }
+
+        ocfs2_xattr_bucket_relse(args->old_bucket);
+        ocfs2_xattr_bucket_relse(args->new_bucket);
+        return ret;
+}
+/*
+ * Create the same xattr extent record in the new inode's xattr tree.
+ */
+static int ocfs2_reflink_xattr_rec(struct inode *inode,
+                                   struct buffer_head *root_bh,
+                                   u64 blkno,
+                                   u32 cpos,
+                                   u32 len,
+                                   void *para)
+{
+        int ret, credits = 0;
+        u32 p_cluster, num_clusters;
+        u64 new_blkno;
+        handle_t *handle;
+        struct ocfs2_reflink_xattr_tree_args *args =
+                        (struct ocfs2_reflink_xattr_tree_args *)para;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_alloc_context *meta_ac = NULL;
+        struct ocfs2_alloc_context *data_ac = NULL;
+        struct ocfs2_extent_tree et;
+
+        ocfs2_init_xattr_tree_extent_tree(&et,
+                                          INODE_CACHE(args->reflink->new_inode),
+                                          args->new_blk_bh);
+
+        ret = ocfs2_lock_reflink_xattr_rec_allocators(args, &et, blkno,
+                                                      len, &credits,
+                                                      &meta_ac, &data_ac);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        handle = ocfs2_start_trans(osb, credits);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_claim_clusters(osb, handle, data_ac,
+                                   len, &p_cluster, &num_clusters);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        new_blkno = ocfs2_clusters_to_blocks(osb->sb, p_cluster);
+
+        mlog(0, "reflink xattr buckets %llu to %llu, len %u\n",
+             (unsigned long long)blkno, (unsigned long long)new_blkno, len);
+        ret = ocfs2_reflink_xattr_buckets(handle, blkno, new_blkno, len,
+                                          meta_ac, data_ac, args);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        mlog(0, "insert new xattr extent rec start %llu len %u to %u\n",
+             (unsigned long long)new_blkno, len, cpos);
+        ret = ocfs2_insert_extent(handle, &et, cpos, new_blkno,
+                                  len, 0, meta_ac);
+        if (ret)
+                mlog_errno(ret);
+
+out_commit:
+        ocfs2_commit_trans(osb, handle);
+
+out:
+        if (meta_ac)
+                ocfs2_free_alloc_context(meta_ac);
+        if (data_ac)
+                ocfs2_free_alloc_context(data_ac);
+        return ret;
+}
+
+/*
+ * Create reflinked xattr buckets.
+ * We will add bucket one by one, and refcount all the xattrs in the bucket
+ * if they are stored outside.
+ */
+static int ocfs2_reflink_xattr_tree(struct ocfs2_xattr_reflink *args,
+                                    struct buffer_head *blk_bh,
+                                    struct buffer_head *new_blk_bh)
+{
+        int ret;
+        struct ocfs2_reflink_xattr_tree_args para;
+
+        memset(&para, 0, sizeof(para));
+        para.reflink = args;
+        para.old_blk_bh = blk_bh;
+        para.new_blk_bh = new_blk_bh;
+
+        para.old_bucket = ocfs2_xattr_bucket_new(args->old_inode);
+        if (!para.old_bucket) {
+                mlog_errno(-ENOMEM);
+                return -ENOMEM;
+        }
+
+        para.new_bucket = ocfs2_xattr_bucket_new(args->new_inode);
+        if (!para.new_bucket) {
+                ret = -ENOMEM;
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_iterate_xattr_index_block(args->old_inode, blk_bh,
+                                              ocfs2_reflink_xattr_rec,
+                                              &para);
+        if (ret)
+                mlog_errno(ret);
+
+out:
+        ocfs2_xattr_bucket_free(para.old_bucket);
+        ocfs2_xattr_bucket_free(para.new_bucket);
+        return ret;
+}
+
+static int ocfs2_reflink_xattr_in_block(struct ocfs2_xattr_reflink *args,
+                                        struct buffer_head *blk_bh)
+{
+        int ret, indexed = 0;
+        struct buffer_head *new_blk_bh = NULL;
+        struct ocfs2_xattr_block *xb =
+                        (struct ocfs2_xattr_block *)blk_bh->b_data;
+
+
+        if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)
+                indexed = 1;
+
+        ret = ocfs2_create_empty_xattr_block(args->new_inode, args->new_bh,
+                                             &new_blk_bh, indexed);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED))
+                ret = ocfs2_reflink_xattr_block(args, blk_bh, new_blk_bh);
+        else
+                ret = ocfs2_reflink_xattr_tree(args, blk_bh, new_blk_bh);
+        if (ret)
+                mlog_errno(ret);
+
+out:
+        brelse(new_blk_bh);
+        return ret;
+}
+
+static int ocfs2_reflink_xattr_no_security(struct ocfs2_xattr_entry *xe)
+{
+        int type = ocfs2_xattr_get_type(xe);
+
+        return type != OCFS2_XATTR_INDEX_SECURITY &&
+               type != OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS &&
+               type != OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
+}
+
+int ocfs2_reflink_xattrs(struct inode *old_inode,
+                         struct buffer_head *old_bh,
+                         struct inode *new_inode,
+                         struct buffer_head *new_bh,
+                         bool preserve_security)
+{
+        int ret;
+        struct ocfs2_xattr_reflink args;
+        struct ocfs2_inode_info *oi = OCFS2_I(old_inode);
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)old_bh->b_data;
+        struct buffer_head *blk_bh = NULL;
+        struct ocfs2_cached_dealloc_ctxt dealloc;
+        struct ocfs2_refcount_tree *ref_tree;
+        struct buffer_head *ref_root_bh = NULL;
+
+        ret = ocfs2_lock_refcount_tree(OCFS2_SB(old_inode->i_sb),
+                                       le64_to_cpu(di->i_refcount_loc),
+                                       1, &ref_tree, &ref_root_bh);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ocfs2_init_dealloc_ctxt(&dealloc);
+
+        args.old_inode = old_inode;
+        args.new_inode = new_inode;
+        args.old_bh = old_bh;
+        args.new_bh = new_bh;
+        args.ref_ci = &ref_tree->rf_ci;
+        args.ref_root_bh = ref_root_bh;
+        args.dealloc = &dealloc;
+        if (preserve_security)
+                args.xattr_reflinked = NULL;
+        else
+                args.xattr_reflinked = ocfs2_reflink_xattr_no_security;
+
+        if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
+                ret = ocfs2_reflink_xattr_inline(&args);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out_unlock;
+                }
+        }
+
+        if (!di->i_xattr_loc)
+                goto out_unlock;
+
+        ret = ocfs2_read_xattr_block(old_inode, le64_to_cpu(di->i_xattr_loc),
+                                     &blk_bh);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto out_unlock;
+        }
+
+        ret = ocfs2_reflink_xattr_in_block(&args, blk_bh);
+        if (ret)
+                mlog_errno(ret);
+
+        brelse(blk_bh);
+
+out_unlock:
+        ocfs2_unlock_refcount_tree(OCFS2_SB(old_inode->i_sb),
+                                   ref_tree, 1);
+        brelse(ref_root_bh);
+
+        if (ocfs2_dealloc_has_cluster(&dealloc)) {
+                ocfs2_schedule_truncate_log_flush(OCFS2_SB(old_inode->i_sb), 1);
+                ocfs2_run_deallocs(OCFS2_SB(old_inode->i_sb), &dealloc);
         }
 
 out:
@@ -5306,6 +6961,51 @@ out:
 }
 
 /*
+ * Initialize security and acl for a already created inode.
+ * Used for reflink a non-preserve-security file.
+ *
+ * It uses common api like ocfs2_xattr_set, so the caller
+ * must not hold any lock expect i_mutex.
+ */
+int ocfs2_init_security_and_acl(struct inode *dir,
+                                struct inode *inode)
+{
+        int ret = 0;
+        struct buffer_head *dir_bh = NULL;
+        struct ocfs2_security_xattr_info si = {
+                .enable = 1,
+        };
+
+        ret = ocfs2_init_security_get(inode, dir, &si);
+        if (!ret) {
+                ret = ocfs2_xattr_security_set(inode, si.name,
+                                               si.value, si.value_len,
+                                               XATTR_CREATE);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto leave;
+                }
+        } else if (ret != -EOPNOTSUPP) {
+                mlog_errno(ret);
+                goto leave;
+        }
+
+        ret = ocfs2_inode_lock(dir, &dir_bh, 0);
+        if (ret) {
+                mlog_errno(ret);
+                goto leave;
+        }
+
+        ret = ocfs2_init_acl(NULL, inode, dir, NULL, dir_bh, NULL, NULL);
+        if (ret)
+                mlog_errno(ret);
+
+        ocfs2_inode_unlock(dir, 0);
+        brelse(dir_bh);
+leave:
+        return ret;
+}
+/*
  * 'security' attributes support
  */
 static size_t ocfs2_xattr_security_list(struct inode *inode, char *list,
diff --git a/fs/ocfs2/xattr.h b/fs/ocfs2/xattr.h
index 1ca7e9a1b7bc..08e36389f56d 100644
--- a/fs/ocfs2/xattr.h
+++ b/fs/ocfs2/xattr.h
@@ -55,6 +55,8 @@ int ocfs2_xattr_set_handle(handle_t *, struct inode *, struct buffer_head *,
                            int, const char *, const void *, size_t, int,
                            struct ocfs2_alloc_context *,
                            struct ocfs2_alloc_context *);
+int ocfs2_has_inline_xattr_value_outside(struct inode *inode,
+                                         struct ocfs2_dinode *di);
 int ocfs2_xattr_remove(struct inode *, struct buffer_head *);
 int ocfs2_init_security_get(struct inode *, struct inode *,
                             struct ocfs2_security_xattr_info *);
@@ -83,5 +85,16 @@ struct ocfs2_xattr_value_buf {
         struct ocfs2_xattr_value_root   *vb_xv;
 };
 
-
+int ocfs2_xattr_attach_refcount_tree(struct inode *inode,
+                                     struct buffer_head *fe_bh,
+                                     struct ocfs2_caching_info *ref_ci,
+                                     struct buffer_head *ref_root_bh,
+                                     struct ocfs2_cached_dealloc_ctxt *dealloc);
+int ocfs2_reflink_xattrs(struct inode *old_inode,
+                         struct buffer_head *old_bh,
+                         struct inode *new_inode,
+                         struct buffer_head *new_bh,
+                         bool preserve_security);
+int ocfs2_init_security_and_acl(struct inode *dir,
+                                struct inode *inode);
 #endif /* OCFS2_XATTR_H */
diff --git a/fs/omfs/dir.c b/fs/omfs/dir.c
index c7275cfbdcfb..b42d62419034 100644
--- a/fs/omfs/dir.c
+++ b/fs/omfs/dir.c
@@ -489,7 +489,7 @@ out:
         return ret;
 }
 
-struct inode_operations omfs_dir_inops = {
+const struct inode_operations omfs_dir_inops = {
         .lookup = omfs_lookup,
         .mkdir = omfs_mkdir,
         .rename = omfs_rename,
@@ -498,7 +498,7 @@ struct inode_operations omfs_dir_inops = {
         .rmdir = omfs_rmdir,
 };
 
-struct file_operations omfs_dir_operations = {
+const struct file_operations omfs_dir_operations = {
         .read = generic_read_dir,
         .readdir = omfs_readdir,
         .llseek = generic_file_llseek,
diff --git a/fs/omfs/file.c b/fs/omfs/file.c
index d17e774eaf45..399487c09364 100644
--- a/fs/omfs/file.c
+++ b/fs/omfs/file.c
@@ -322,7 +322,7 @@ static sector_t omfs_bmap(struct address_space *mapping, sector_t block)
         return generic_block_bmap(mapping, block, omfs_get_block);
 }
 
-struct file_operations omfs_file_operations = {
+const struct file_operations omfs_file_operations = {
         .llseek = generic_file_llseek,
         .read = do_sync_read,
         .write = do_sync_write,
@@ -333,11 +333,11 @@ struct file_operations omfs_file_operations = {
         .splice_read = generic_file_splice_read,
 };
 
-struct inode_operations omfs_file_inops = {
+const struct inode_operations omfs_file_inops = {
         .truncate = omfs_truncate
 };
 
-struct address_space_operations omfs_aops = {
+const struct address_space_operations omfs_aops = {
         .readpage = omfs_readpage,
         .readpages = omfs_readpages,
         .writepage = omfs_writepage,
diff --git a/fs/omfs/inode.c b/fs/omfs/inode.c
index 379ae5fb4411..f3b7c1541f3a 100644
--- a/fs/omfs/inode.c
+++ b/fs/omfs/inode.c
@@ -278,7 +278,7 @@ static int omfs_statfs(struct dentry *dentry, struct kstatfs *buf)
         return 0;
 }
 
-static struct super_operations omfs_sops = {
+static const struct super_operations omfs_sops = {
         .write_inode    = omfs_write_inode,
         .delete_inode   = omfs_delete_inode,
         .put_super      = omfs_put_super,
diff --git a/fs/omfs/omfs.h b/fs/omfs/omfs.h
index 2bc0f0670406..ebe2fdbe535e 100644
--- a/fs/omfs/omfs.h
+++ b/fs/omfs/omfs.h
@@ -44,16 +44,16 @@ extern int omfs_allocate_range(struct super_block *sb, int min_request,
 extern int omfs_clear_range(struct super_block *sb, u64 block, int count);
 
 /* dir.c */
-extern struct file_operations omfs_dir_operations;
-extern struct inode_operations omfs_dir_inops;
+extern const struct file_operations omfs_dir_operations;
+extern const struct inode_operations omfs_dir_inops;
 extern int omfs_make_empty(struct inode *inode, struct super_block *sb);
 extern int omfs_is_bad(struct omfs_sb_info *sbi, struct omfs_header *header,
                         u64 fsblock);
 
 /* file.c */
-extern struct file_operations omfs_file_operations;
-extern struct inode_operations omfs_file_inops;
-extern struct address_space_operations omfs_aops;
+extern const struct file_operations omfs_file_operations;
+extern const struct inode_operations omfs_file_inops;
+extern const struct address_space_operations omfs_aops;
 extern void omfs_make_empty_table(struct buffer_head *bh, int offset);
 extern int omfs_shrink_inode(struct inode *inode);
 
diff --git a/fs/open.c b/fs/open.c
index 31191bf513e4..4f01e06227c6 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -290,10 +290,9 @@ out:
         return error;
 }
 
-SYSCALL_DEFINE2(truncate, const char __user *, path, unsigned long, length)
+SYSCALL_DEFINE2(truncate, const char __user *, path, long, length)
 {
-        /* on 32-bit boxen it will cut the range 2^31--2^32-1 off */
-        return do_sys_truncate(path, (long)length);
+        return do_sys_truncate(path, length);
 }
 
 static long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index fbeaddf595d3..f38fee0311a7 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -248,19 +248,11 @@ ssize_t part_stat_show(struct device *dev,
                 part_stat_read(p, merges[WRITE]),
                 (unsigned long long)part_stat_read(p, sectors[WRITE]),
                 jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
-                part_in_flight(p),
+                p->in_flight,
                 jiffies_to_msecs(part_stat_read(p, io_ticks)),
                 jiffies_to_msecs(part_stat_read(p, time_in_queue)));
 }
 
-ssize_t part_inflight_show(struct device *dev,
-                        struct device_attribute *attr, char *buf)
-{
-        struct hd_struct *p = dev_to_part(dev);
-
-        return sprintf(buf, "%8u %8u\n", p->in_flight[0], p->in_flight[1]);
-}
-
 #ifdef CONFIG_FAIL_MAKE_REQUEST
 ssize_t part_fail_show(struct device *dev,
                        struct device_attribute *attr, char *buf)
@@ -289,7 +281,6 @@ static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
 static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
 static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL);
 static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
-static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL);
 #ifdef CONFIG_FAIL_MAKE_REQUEST
 static struct device_attribute dev_attr_fail =
         __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
@@ -301,7 +292,6 @@ static struct attribute *part_attrs[] = {
         &dev_attr_size.attr,
         &dev_attr_alignment_offset.attr,
         &dev_attr_stat.attr,
-        &dev_attr_inflight.attr,
 #ifdef CONFIG_FAIL_MAKE_REQUEST
         &dev_attr_fail.attr,
 #endif
@@ -581,7 +571,7 @@ try_scan:
                 }
 
                 if (from + size > get_capacity(disk)) {
-                        struct block_device_operations *bdops = disk->fops;
+                        const struct block_device_operations *bdops = disk->fops;
                         unsigned long long capacity;
 
                         printk(KERN_WARNING
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 725a650bbbb8..07f77a7945c3 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -82,6 +82,7 @@
 #include <linux/pid_namespace.h>
 #include <linux/ptrace.h>
 #include <linux/tracehook.h>
+#include <linux/swapops.h>
 
 #include <asm/pgtable.h>
 #include <asm/processor.h>
@@ -321,6 +322,94 @@ static inline void task_context_switch_counts(struct seq_file *m,
                         p->nivcsw);
 }
 
+#ifdef CONFIG_MMU
+
+struct stack_stats {
+        struct vm_area_struct *vma;
+        unsigned long   startpage;
+        unsigned long   usage;
+};
+
+static int stack_usage_pte_range(pmd_t *pmd, unsigned long addr,
+                                unsigned long end, struct mm_walk *walk)
+{
+        struct stack_stats *ss = walk->private;
+        struct vm_area_struct *vma = ss->vma;
+        pte_t *pte, ptent;
+        spinlock_t *ptl;
+        int ret = 0;
+
+        pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
+        for (; addr != end; pte++, addr += PAGE_SIZE) {
+                ptent = *pte;
+
+#ifdef CONFIG_STACK_GROWSUP
+                if (pte_present(ptent) || is_swap_pte(ptent))
+                        ss->usage = addr - ss->startpage + PAGE_SIZE;
+#else
+                if (pte_present(ptent) || is_swap_pte(ptent)) {
+                        ss->usage = ss->startpage - addr + PAGE_SIZE;
+                        pte++;
+                        ret = 1;
+                        break;
+                }
+#endif
+        }
+        pte_unmap_unlock(pte - 1, ptl);
+        cond_resched();
+        return ret;
+}
+
+static inline unsigned long get_stack_usage_in_bytes(struct vm_area_struct *vma,
+                                struct task_struct *task)
+{
+        struct stack_stats ss;
+        struct mm_walk stack_walk = {
+                .pmd_entry = stack_usage_pte_range,
+                .mm = vma->vm_mm,
+                .private = &ss,
+        };
+
+        if (!vma->vm_mm || is_vm_hugetlb_page(vma))
+                return 0;
+
+        ss.vma = vma;
+        ss.startpage = task->stack_start & PAGE_MASK;
+        ss.usage = 0;
+
+#ifdef CONFIG_STACK_GROWSUP
+        walk_page_range(KSTK_ESP(task) & PAGE_MASK, vma->vm_end,
+                &stack_walk);
+#else
+        walk_page_range(vma->vm_start, (KSTK_ESP(task) & PAGE_MASK) + PAGE_SIZE,
+                &stack_walk);
+#endif
+        return ss.usage;
+}
+
+static inline void task_show_stack_usage(struct seq_file *m,
+                                                struct task_struct *task)
+{
+        struct vm_area_struct   *vma;
+        struct mm_struct        *mm = get_task_mm(task);
+
+        if (mm) {
+                down_read(&mm->mmap_sem);
+                vma = find_vma(mm, task->stack_start);
+                if (vma)
+                        seq_printf(m, "Stack usage:\t%lu kB\n",
+                                get_stack_usage_in_bytes(vma, task) >> 10);
+
+                up_read(&mm->mmap_sem);
+                mmput(mm);
+        }
+}
+#else
+static void task_show_stack_usage(struct seq_file *m, struct task_struct *task)
+{
+}
+#endif          /* CONFIG_MMU */
+
 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
                         struct pid *pid, struct task_struct *task)
 {
@@ -340,6 +429,7 @@ int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
         task_show_regs(m, task);
 #endif
         task_context_switch_counts(m, task);
+        task_show_stack_usage(m, task);
         return 0;
 }
 
@@ -481,7 +571,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
                 rsslim,
                 mm ? mm->start_code : 0,
                 mm ? mm->end_code : 0,
-                (permitted && mm) ? mm->start_stack : 0,
+                (permitted) ? task->stack_start : 0,
                 esp,
                 eip,
                 /* The signal information here is obsolete.
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 6f742f6658a9..837469a96598 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -447,7 +447,7 @@ static int proc_oom_score(struct task_struct *task, char *buffer)
 
         do_posix_clock_monotonic_gettime(&uptime);
         read_lock(&tasklist_lock);
-        points = badness(task, uptime.tv_sec);
+        points = badness(task->group_leader, uptime.tv_sec);
         read_unlock(&tasklist_lock);
         return sprintf(buffer, "%lu\n", points);
 }
@@ -458,7 +458,7 @@ struct limit_names {
 };
 
 static const struct limit_names lnames[RLIM_NLIMITS] = {
-        [RLIMIT_CPU] = {"Max cpu time", "ms"},
+        [RLIMIT_CPU] = {"Max cpu time", "seconds"},
         [RLIMIT_FSIZE] = {"Max file size", "bytes"},
         [RLIMIT_DATA] = {"Max data size", "bytes"},
         [RLIMIT_STACK] = {"Max stack size", "bytes"},
@@ -999,11 +999,17 @@ static ssize_t oom_adjust_read(struct file *file, char __user *buf,
         struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
         char buffer[PROC_NUMBUF];
         size_t len;
-        int oom_adjust;
+        int oom_adjust = OOM_DISABLE;
+        unsigned long flags;
 
         if (!task)
                 return -ESRCH;
-        oom_adjust = task->oomkilladj;
+
+        if (lock_task_sighand(task, &flags)) {
+                oom_adjust = task->signal->oom_adj;
+                unlock_task_sighand(task, &flags);
+        }
+
         put_task_struct(task);
 
         len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust);
@@ -1015,32 +1021,44 @@ static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
                                 size_t count, loff_t *ppos)
 {
         struct task_struct *task;
-        char buffer[PROC_NUMBUF], *end;
-        int oom_adjust;
+        char buffer[PROC_NUMBUF];
+        long oom_adjust;
+        unsigned long flags;
+        int err;
 
         memset(buffer, 0, sizeof(buffer));
         if (count > sizeof(buffer) - 1)
                 count = sizeof(buffer) - 1;
         if (copy_from_user(buffer, buf, count))
                 return -EFAULT;
-        oom_adjust = simple_strtol(buffer, &end, 0);
+
+        err = strict_strtol(strstrip(buffer), 0, &oom_adjust);
+        if (err)
+                return -EINVAL;
         if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) &&
              oom_adjust != OOM_DISABLE)
                 return -EINVAL;
-        if (*end == '\n')
-                end++;
+
         task = get_proc_task(file->f_path.dentry->d_inode);
         if (!task)
                 return -ESRCH;
-        if (oom_adjust < task->oomkilladj && !capable(CAP_SYS_RESOURCE)) {
+        if (!lock_task_sighand(task, &flags)) {
+                put_task_struct(task);
+                return -ESRCH;
+        }
+
+        if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) {
+                unlock_task_sighand(task, &flags);
                 put_task_struct(task);
                 return -EACCES;
         }
-        task->oomkilladj = oom_adjust;
+
+        task->signal->oom_adj = oom_adjust;
+
+        unlock_task_sighand(task, &flags);
         put_task_struct(task);
-        if (end - buffer == 0)
-                return -EIO;
-        return end - buffer;
+
+        return count;
 }
 
 static const struct file_operations proc_oom_adjust_operations = {
@@ -1169,17 +1187,16 @@ static ssize_t proc_fault_inject_write(struct file * file,
                 count = sizeof(buffer) - 1;
         if (copy_from_user(buffer, buf, count))
                 return -EFAULT;
-        make_it_fail = simple_strtol(buffer, &end, 0);
-        if (*end == '\n')
-                end++;
+        make_it_fail = simple_strtol(strstrip(buffer), &end, 0);
+        if (*end)
+                return -EINVAL;
         task = get_proc_task(file->f_dentry->d_inode);
         if (!task)
                 return -ESRCH;
         task->make_it_fail = make_it_fail;
         put_task_struct(task);
-        if (end - buffer == 0)
-                return -EIO;
-        return end - buffer;
+
+        return count;
 }
 
 static const struct file_operations proc_fault_inject_operations = {
@@ -2586,9 +2603,6 @@ static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
                 dput(dentry);
         }
 
-        if (tgid == 0)
-                goto out;
-
         name.name = buf;
         name.len = snprintf(buf, sizeof(buf), "%d", tgid);
         leader = d_hash_and_lookup(mnt->mnt_root, &name);
@@ -2645,17 +2659,16 @@ out:
 void proc_flush_task(struct task_struct *task)
 {
         int i;
-        struct pid *pid, *tgid = NULL;
+        struct pid *pid, *tgid;
         struct upid *upid;
 
         pid = task_pid(task);
-        if (thread_group_leader(task))
-                tgid = task_tgid(task);
+        tgid = task_tgid(task);
 
         for (i = 0; i <= pid->level; i++) {
                 upid = &pid->numbers[i];
                 proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
-                        tgid ? tgid->numbers[i].nr : 0);
+                                        tgid->numbers[i].nr);
         }
 
         upid = &pid->numbers[pid->level];
diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index 59b43a068872..56013371f9f3 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -17,9 +17,15 @@
 #include <linux/elfcore.h>
 #include <linux/vmalloc.h>
 #include <linux/highmem.h>
+#include <linux/bootmem.h>
 #include <linux/init.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>
+#include <linux/list.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/memory.h>
+#include <asm/sections.h>
 
 #define CORE_STR "CORE"
 
@@ -29,17 +35,6 @@
 
 static struct proc_dir_entry *proc_root_kcore;
 
-static int open_kcore(struct inode * inode, struct file * filp)
-{
-        return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
-}
-
-static ssize_t read_kcore(struct file *, char __user *, size_t, loff_t *);
-
-static const struct file_operations proc_kcore_operations = {
-        .read           = read_kcore,
-        .open           = open_kcore,
-};
 
 #ifndef kc_vaddr_to_offset
 #define kc_vaddr_to_offset(v) ((v) - PAGE_OFFSET)
@@ -57,18 +52,19 @@ struct memelfnote
         void *data;
 };
 
-static struct kcore_list *kclist;
+static LIST_HEAD(kclist_head);
 static DEFINE_RWLOCK(kclist_lock);
+static int kcore_need_update = 1;
 
 void
-kclist_add(struct kcore_list *new, void *addr, size_t size)
+kclist_add(struct kcore_list *new, void *addr, size_t size, int type)
 {
         new->addr = (unsigned long)addr;
         new->size = size;
+        new->type = type;
 
         write_lock(&kclist_lock);
-        new->next = kclist;
-        kclist = new;
+        list_add_tail(&new->list, &kclist_head);
         write_unlock(&kclist_lock);
 }
 
@@ -80,7 +76,7 @@ static size_t get_kcore_size(int *nphdr, size_t *elf_buflen)
         *nphdr = 1; /* PT_NOTE */
         size = 0;
 
-        for (m=kclist; m; m=m->next) {
+        list_for_each_entry(m, &kclist_head, list) {
                 try = kc_vaddr_to_offset((size_t)m->addr + m->size);
                 if (try > size)
                         size = try;
@@ -97,6 +93,177 @@ static size_t get_kcore_size(int *nphdr, size_t *elf_buflen)
         return size + *elf_buflen;
 }
 
+static void free_kclist_ents(struct list_head *head)
+{
+        struct kcore_list *tmp, *pos;
+
+        list_for_each_entry_safe(pos, tmp, head, list) {
+                list_del(&pos->list);
+                kfree(pos);
+        }
+}
+/*
+ * Replace all KCORE_RAM/KCORE_VMEMMAP information with passed list.
+ */
+static void __kcore_update_ram(struct list_head *list)
+{
+        int nphdr;
+        size_t size;
+        struct kcore_list *tmp, *pos;
+        LIST_HEAD(garbage);
+
+        write_lock(&kclist_lock);
+        if (kcore_need_update) {
+                list_for_each_entry_safe(pos, tmp, &kclist_head, list) {
+                        if (pos->type == KCORE_RAM
+                                || pos->type == KCORE_VMEMMAP)
+                                list_move(&pos->list, &garbage);
+                }
+                list_splice_tail(list, &kclist_head);
+        } else
+                list_splice(list, &garbage);
+        kcore_need_update = 0;
+        proc_root_kcore->size = get_kcore_size(&nphdr, &size);
+        write_unlock(&kclist_lock);
+
+        free_kclist_ents(&garbage);
+}
+
+
+#ifdef CONFIG_HIGHMEM
+/*
+ * If no highmem, we can assume [0...max_low_pfn) continuous range of memory
+ * because memory hole is not as big as !HIGHMEM case.
+ * (HIGHMEM is special because part of memory is _invisible_ from the kernel.)
+ */
+static int kcore_update_ram(void)
+{
+        LIST_HEAD(head);
+        struct kcore_list *ent;
+        int ret = 0;
+
+        ent = kmalloc(sizeof(*ent), GFP_KERNEL);
+        if (!ent)
+                return -ENOMEM;
+        ent->addr = (unsigned long)__va(0);
+        ent->size = max_low_pfn << PAGE_SHIFT;
+        ent->type = KCORE_RAM;
+        list_add(&ent->list, &head);
+        __kcore_update_ram(&head);
+        return ret;
+}
+
+#else /* !CONFIG_HIGHMEM */
+
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+/* calculate vmemmap's address from given system ram pfn and register it */
+int get_sparsemem_vmemmap_info(struct kcore_list *ent, struct list_head *head)
+{
+        unsigned long pfn = __pa(ent->addr) >> PAGE_SHIFT;
+        unsigned long nr_pages = ent->size >> PAGE_SHIFT;
+        unsigned long start, end;
+        struct kcore_list *vmm, *tmp;
+
+
+        start = ((unsigned long)pfn_to_page(pfn)) & PAGE_MASK;
+        end = ((unsigned long)pfn_to_page(pfn + nr_pages)) - 1;
+        end = ALIGN(end, PAGE_SIZE);
+        /* overlap check (because we have to align page */
+        list_for_each_entry(tmp, head, list) {
+                if (tmp->type != KCORE_VMEMMAP)
+                        continue;
+                if (start < tmp->addr + tmp->size)
+                        if (end > tmp->addr)
+                                end = tmp->addr;
+        }
+        if (start < end) {
+                vmm = kmalloc(sizeof(*vmm), GFP_KERNEL);
+                if (!vmm)
+                        return 0;
+                vmm->addr = start;
+                vmm->size = end - start;
+                vmm->type = KCORE_VMEMMAP;
+                list_add_tail(&vmm->list, head);
+        }
+        return 1;
+
+}
+#else
+int get_sparsemem_vmemmap_info(struct kcore_list *ent, struct list_head *head)
+{
+        return 1;
+}
+
+#endif
+
+static int
+kclist_add_private(unsigned long pfn, unsigned long nr_pages, void *arg)
+{
+        struct list_head *head = (struct list_head *)arg;
+        struct kcore_list *ent;
+
+        ent = kmalloc(sizeof(*ent), GFP_KERNEL);
+        if (!ent)
+                return -ENOMEM;
+        ent->addr = (unsigned long)__va((pfn << PAGE_SHIFT));
+        ent->size = nr_pages << PAGE_SHIFT;
+
+        /* Sanity check: Can happen in 32bit arch...maybe */
+        if (ent->addr < (unsigned long) __va(0))
+                goto free_out;
+
+        /* cut not-mapped area. ....from ppc-32 code. */
+        if (ULONG_MAX - ent->addr < ent->size)
+                ent->size = ULONG_MAX - ent->addr;
+
+        /* cut when vmalloc() area is higher than direct-map area */
+        if (VMALLOC_START > (unsigned long)__va(0)) {
+                if (ent->addr > VMALLOC_START)
+                        goto free_out;
+                if (VMALLOC_START - ent->addr < ent->size)
+                        ent->size = VMALLOC_START - ent->addr;
+        }
+
+        ent->type = KCORE_RAM;
+        list_add_tail(&ent->list, head);
+
+        if (!get_sparsemem_vmemmap_info(ent, head)) {
+                list_del(&ent->list);
+                goto free_out;
+        }
+
+        return 0;
+free_out:
+        kfree(ent);
+        return 1;
+}
+
+static int kcore_update_ram(void)
+{
+        int nid, ret;
+        unsigned long end_pfn;
+        LIST_HEAD(head);
+
+        /* Not inialized....update now */
+        /* find out "max pfn" */
+        end_pfn = 0;
+        for_each_node_state(nid, N_HIGH_MEMORY) {
+                unsigned long node_end;
+                node_end  = NODE_DATA(nid)->node_start_pfn +
+                        NODE_DATA(nid)->node_spanned_pages;
+                if (end_pfn < node_end)
+                        end_pfn = node_end;
+        }
+        /* scan 0 to max_pfn */
+        ret = walk_system_ram_range(0, end_pfn, &head, kclist_add_private);
+        if (ret) {
+                free_kclist_ents(&head);
+                return -ENOMEM;
+        }
+        __kcore_update_ram(&head);
+        return ret;
+}
+#endif /* CONFIG_HIGHMEM */
 
 /*****************************************************************************/
 /*
@@ -192,7 +359,7 @@ static void elf_kcore_store_hdr(char *bufp, int nphdr, int dataoff)
         nhdr->p_align   = 0;
 
         /* setup ELF PT_LOAD program header for every area */
-        for (m=kclist; m; m=m->next) {
+        list_for_each_entry(m, &kclist_head, list) {
                 phdr = (struct elf_phdr *) bufp;
                 bufp += sizeof(struct elf_phdr);
                 offset += sizeof(struct elf_phdr);
@@ -265,7 +432,8 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
         unsigned long start;
 
         read_lock(&kclist_lock);
-        proc_root_kcore->size = size = get_kcore_size(&nphdr, &elf_buflen);
+        size = get_kcore_size(&nphdr, &elf_buflen);
+
         if (buflen == 0 || *fpos >= size) {
                 read_unlock(&kclist_lock);
                 return 0;
@@ -317,7 +485,7 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
                 struct kcore_list *m;
 
                 read_lock(&kclist_lock);
-                for (m=kclist; m; m=m->next) {
+                list_for_each_entry(m, &kclist_head, list) {
                         if (start >= m->addr && start < (m->addr+m->size))
                                 break;
                 }
@@ -326,45 +494,14 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
                 if (m == NULL) {
                         if (clear_user(buffer, tsz))
                                 return -EFAULT;
-                } else if (is_vmalloc_addr((void *)start)) {
+                } else if (is_vmalloc_or_module_addr((void *)start)) {
                         char * elf_buf;
-                        struct vm_struct *m;
-                        unsigned long curstart = start;
-                        unsigned long cursize = tsz;
 
                         elf_buf = kzalloc(tsz, GFP_KERNEL);
                         if (!elf_buf)
                                 return -ENOMEM;
-
-                        read_lock(&vmlist_lock);
-                        for (m=vmlist; m && cursize; m=m->next) {
-                                unsigned long vmstart;
-                                unsigned long vmsize;
-                                unsigned long msize = m->size - PAGE_SIZE;
-
-                                if (((unsigned long)m->addr + msize) < 
-                                                                curstart)
-                                        continue;
-                                if ((unsigned long)m->addr > (curstart + 
-                                                                cursize))
-                                        break;
-                                vmstart = (curstart < (unsigned long)m->addr ? 
-                                        (unsigned long)m->addr : curstart);
-                                if (((unsigned long)m->addr + msize) > 
-                                                        (curstart + cursize))
-                                        vmsize = curstart + cursize - vmstart;
-                                else
-                                        vmsize = (unsigned long)m->addr + 
-                                                        msize - vmstart;
-                                curstart = vmstart + vmsize;
-                                cursize -= vmsize;
-                                /* don't dump ioremap'd stuff! (TA) */
-                                if (m->flags & VM_IOREMAP)
-                                        continue;
-                                memcpy(elf_buf + (vmstart - start),
-                                        (char *)vmstart, vmsize);
-                        }
-                        read_unlock(&vmlist_lock);
+                        vread(elf_buf, (char *)start, tsz);
+                        /* we have to zero-fill user buffer even if no read */
                         if (copy_to_user(buffer, elf_buf, tsz)) {
                                 kfree(elf_buf);
                                 return -EFAULT;
@@ -402,12 +539,96 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
         return acc;
 }
 
+
+static int open_kcore(struct inode *inode, struct file *filp)
+{
+        if (!capable(CAP_SYS_RAWIO))
+                return -EPERM;
+        if (kcore_need_update)
+                kcore_update_ram();
+        if (i_size_read(inode) != proc_root_kcore->size) {
+                mutex_lock(&inode->i_mutex);
+                i_size_write(inode, proc_root_kcore->size);
+                mutex_unlock(&inode->i_mutex);
+        }
+        return 0;
+}
+
+
+static const struct file_operations proc_kcore_operations = {
+        .read           = read_kcore,
+        .open           = open_kcore,
+};
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+/* just remember that we have to update kcore */
+static int __meminit kcore_callback(struct notifier_block *self,
+                                    unsigned long action, void *arg)
+{
+        switch (action) {
+        case MEM_ONLINE:
+        case MEM_OFFLINE:
+                write_lock(&kclist_lock);
+                kcore_need_update = 1;
+                write_unlock(&kclist_lock);
+        }
+        return NOTIFY_OK;
+}
+#endif
+
+
+static struct kcore_list kcore_vmalloc;
+
+#ifdef CONFIG_ARCH_PROC_KCORE_TEXT
+static struct kcore_list kcore_text;
+/*
+ * If defined, special segment is used for mapping kernel text instead of
+ * direct-map area. We need to create special TEXT section.
+ */
+static void __init proc_kcore_text_init(void)
+{
+        kclist_add(&kcore_text, _stext, _end - _stext, KCORE_TEXT);
+}
+#else
+static void __init proc_kcore_text_init(void)
+{
+}
+#endif
+
+#if defined(CONFIG_MODULES) && defined(MODULES_VADDR)
+/*
+ * MODULES_VADDR has no intersection with VMALLOC_ADDR.
+ */
+struct kcore_list kcore_modules;
+static void __init add_modules_range(void)
+{
+        kclist_add(&kcore_modules, (void *)MODULES_VADDR,
+                        MODULES_END - MODULES_VADDR, KCORE_VMALLOC);
+}
+#else
+static void __init add_modules_range(void)
+{
+}
+#endif
+
 static int __init proc_kcore_init(void)
 {
-        proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
-        if (proc_root_kcore)
-                proc_root_kcore->size =
-                                (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
+        proc_root_kcore = proc_create("kcore", S_IRUSR, NULL,
+                                      &proc_kcore_operations);
+        if (!proc_root_kcore) {
+                printk(KERN_ERR "couldn't create /proc/kcore\n");
+                return 0; /* Always returns 0. */
+        }
+        /* Store text area if it's special */
+        proc_kcore_text_init();
+        /* Store vmalloc area */
+        kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
+                VMALLOC_END - VMALLOC_START, KCORE_VMALLOC);
+        add_modules_range();
+        /* Store direct-map area from physical memory map */
+        kcore_update_ram();
+        hotplug_memory_notifier(kcore_callback, 0);
+
         return 0;
 }
 module_init(proc_kcore_init);
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index d5c410d47fae..c7bff4f603ff 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -81,9 +81,11 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
                 "Writeback:      %8lu kB\n"
                 "AnonPages:      %8lu kB\n"
                 "Mapped:         %8lu kB\n"
+                "Shmem:          %8lu kB\n"
                 "Slab:           %8lu kB\n"
                 "SReclaimable:   %8lu kB\n"
                 "SUnreclaim:     %8lu kB\n"
+                "KernelStack:    %8lu kB\n"
                 "PageTables:     %8lu kB\n"
 #ifdef CONFIG_QUICKLIST
                 "Quicklists:     %8lu kB\n"
@@ -95,7 +97,11 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
                 "Committed_AS:   %8lu kB\n"
                 "VmallocTotal:   %8lu kB\n"
                 "VmallocUsed:    %8lu kB\n"
-                "VmallocChunk:   %8lu kB\n",
+                "VmallocChunk:   %8lu kB\n"
+#ifdef CONFIG_MEMORY_FAILURE
+                "HardwareCorrupted: %8lu kB\n"
+#endif
+                ,
                 K(i.totalram),
                 K(i.freeram),
                 K(i.bufferram),
@@ -124,10 +130,12 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
                 K(global_page_state(NR_WRITEBACK)),
                 K(global_page_state(NR_ANON_PAGES)),
                 K(global_page_state(NR_FILE_MAPPED)),
+                K(global_page_state(NR_SHMEM)),
                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
+                global_page_state(NR_KERNEL_STACK) * THREAD_SIZE / 1024,
                 K(global_page_state(NR_PAGETABLE)),
 #ifdef CONFIG_QUICKLIST
                 K(quicklist_total_size()),
@@ -140,6 +148,9 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
                 (unsigned long)VMALLOC_TOTAL >> 10,
                 vmi.used >> 10,
                 vmi.largest_chunk >> 10
+#ifdef CONFIG_MEMORY_FAILURE
+                ,atomic_long_read(&mce_bad_pages) << (PAGE_SHIFT - 10)
+#endif
                 );
 
         hugetlb_report_meminfo(m);
diff --git a/fs/proc/nommu.c b/fs/proc/nommu.c
index 7e14d1a04001..9fe7d7ebe115 100644
--- a/fs/proc/nommu.c
+++ b/fs/proc/nommu.c
@@ -109,7 +109,7 @@ static void *nommu_region_list_next(struct seq_file *m, void *v, loff_t *pos)
         return rb_next((struct rb_node *) v);
 }
 
-static struct seq_operations proc_nommu_region_list_seqop = {
+static const struct seq_operations proc_nommu_region_list_seqop = {
         .start  = nommu_region_list_start,
         .next   = nommu_region_list_next,
         .stop   = nommu_region_list_stop,
diff --git a/fs/proc/page.c b/fs/proc/page.c
index 2707c6c7a20f..2281c2cbfe2b 100644
--- a/fs/proc/page.c
+++ b/fs/proc/page.c
@@ -2,6 +2,7 @@
 #include <linux/compiler.h>
 #include <linux/fs.h>
 #include <linux/init.h>
+#include <linux/ksm.h>
 #include <linux/mm.h>
 #include <linux/mmzone.h>
 #include <linux/proc_fs.h>
@@ -95,6 +96,8 @@ static const struct file_operations proc_kpagecount_operations = {
 #define KPF_UNEVICTABLE         18
 #define KPF_NOPAGE              20
 
+#define KPF_KSM                 21
+
 /* kernel hacking assistances
  * WARNING: subject to change, never rely on them!
  */
@@ -137,6 +140,8 @@ static u64 get_uflags(struct page *page)
                 u |= 1 << KPF_MMAP;
         if (PageAnon(page))
                 u |= 1 << KPF_ANON;
+        if (PageKsm(page))
+                u |= 1 << KPF_KSM;
 
         /*
          * compound pages: export both head/tail info
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 9b1e4e9a16bf..f667e8aeabdf 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -153,7 +153,7 @@ static ssize_t proc_sys_call_handler(struct file *filp, void __user *buf,
 
         /* careful: calling conventions are nasty here */
         res = count;
-        error = table->proc_handler(table, write, filp, buf, &res, ppos);
+        error = table->proc_handler(table, write, buf, &res, ppos);
         if (!error)
                 error = res;
 out:
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 9bd8be1d235c..2a1bef9203c6 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -243,6 +243,25 @@ static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
                                 } else if (vma->vm_start <= mm->start_stack &&
                                            vma->vm_end >= mm->start_stack) {
                                         name = "[stack]";
+                                } else {
+                                        unsigned long stack_start;
+                                        struct proc_maps_private *pmp;
+
+                                        pmp = m->private;
+                                        stack_start = pmp->task->stack_start;
+
+                                        if (vma->vm_start <= stack_start &&
+                                            vma->vm_end >= stack_start) {
+                                                pad_len_spaces(m, len);
+                                                seq_printf(m,
+                                                 "[threadstack:%08lx]",
+#ifdef CONFIG_STACK_GROWSUP
+                                                 vma->vm_end - stack_start
+#else
+                                                 stack_start - vma->vm_start
+#endif
+                                                );
+                                        }
                                 }
                         } else {
                                 name = "[vdso]";
@@ -465,23 +484,28 @@ static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
         return 0;
 }
 
+#define CLEAR_REFS_ALL 1
+#define CLEAR_REFS_ANON 2
+#define CLEAR_REFS_MAPPED 3
+
 static ssize_t clear_refs_write(struct file *file, const char __user *buf,
                                 size_t count, loff_t *ppos)
 {
         struct task_struct *task;
-        char buffer[PROC_NUMBUF], *end;
+        char buffer[PROC_NUMBUF];
         struct mm_struct *mm;
         struct vm_area_struct *vma;
+        long type;
 
         memset(buffer, 0, sizeof(buffer));
         if (count > sizeof(buffer) - 1)
                 count = sizeof(buffer) - 1;
         if (copy_from_user(buffer, buf, count))
                 return -EFAULT;
-        if (!simple_strtol(buffer, &end, 0))
+        if (strict_strtol(strstrip(buffer), 10, &type))
+                return -EINVAL;
+        if (type < CLEAR_REFS_ALL || type > CLEAR_REFS_MAPPED)
                 return -EINVAL;
-        if (*end == '\n')
-                end++;
         task = get_proc_task(file->f_path.dentry->d_inode);
         if (!task)
                 return -ESRCH;
@@ -494,18 +518,31 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
                 down_read(&mm->mmap_sem);
                 for (vma = mm->mmap; vma; vma = vma->vm_next) {
                         clear_refs_walk.private = vma;
-                        if (!is_vm_hugetlb_page(vma))
-                                walk_page_range(vma->vm_start, vma->vm_end,
-                                                &clear_refs_walk);
+                        if (is_vm_hugetlb_page(vma))
+                                continue;
+                        /*
+                         * Writing 1 to /proc/pid/clear_refs affects all pages.
+                         *
+                         * Writing 2 to /proc/pid/clear_refs only affects
+                         * Anonymous pages.
+                         *
+                         * Writing 3 to /proc/pid/clear_refs only affects file
+                         * mapped pages.
+                         */
+                        if (type == CLEAR_REFS_ANON && vma->vm_file)
+                                continue;
+                        if (type == CLEAR_REFS_MAPPED && !vma->vm_file)
+                                continue;
+                        walk_page_range(vma->vm_start, vma->vm_end,
+                                        &clear_refs_walk);
                 }
                 flush_tlb_mm(mm);
                 up_read(&mm->mmap_sem);
                 mmput(mm);
         }
         put_task_struct(task);
-        if (end - buffer == 0)
-                return -EIO;
-        return end - buffer;
+
+        return count;
 }
 
 const struct file_operations proc_clear_refs_operations = {
diff --git a/fs/proc/uptime.c b/fs/proc/uptime.c
index 0c10a0b3f146..766b1d456050 100644
--- a/fs/proc/uptime.c
+++ b/fs/proc/uptime.c
@@ -4,13 +4,18 @@
 #include <linux/sched.h>
 #include <linux/seq_file.h>
 #include <linux/time.h>
+#include <linux/kernel_stat.h>
 #include <asm/cputime.h>
 
 static int uptime_proc_show(struct seq_file *m, void *v)
 {
         struct timespec uptime;
         struct timespec idle;
-        cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
+        int i;
+        cputime_t idletime = cputime_zero;
+
+        for_each_possible_cpu(i)
+                idletime = cputime64_add(idletime, kstat_cpu(i).cpustat.idle);
 
         do_posix_clock_monotonic_gettime(&uptime);
         monotonic_to_bootbased(&uptime);
diff --git a/fs/qnx4/Kconfig b/fs/qnx4/Kconfig
index be8e0e1445b6..5f6089994042 100644
--- a/fs/qnx4/Kconfig
+++ b/fs/qnx4/Kconfig
@@ -6,20 +6,9 @@ config QNX4FS_FS
           QNX 4 and QNX 6 (the latter is also called QNX RTP).
           Further information is available at <http://www.qnx.com/>.
           Say Y if you intend to mount QNX hard disks or floppies.
-          Unless you say Y to "QNX4FS read-write support" below, you will
-          only be able to read these file systems.
 
           To compile this file system support as a module, choose M here: the
           module will be called qnx4.
 
           If you don't know whether you need it, then you don't need it:
           answer N.
-
-config QNX4FS_RW
-        bool "QNX4FS write support (DANGEROUS)"
-        depends on QNX4FS_FS && EXPERIMENTAL && BROKEN
-        help
-          Say Y if you want to test write support for QNX4 file systems.
-
-          It's currently broken, so for now:
-          answer N.
diff --git a/fs/qnx4/Makefile b/fs/qnx4/Makefile
index e4d408cc5473..4a283b3f87f8 100644
--- a/fs/qnx4/Makefile
+++ b/fs/qnx4/Makefile
@@ -4,4 +4,4 @@
 
 obj-$(CONFIG_QNX4FS_FS) += qnx4.o
 
-qnx4-objs := inode.o dir.o namei.o file.o bitmap.o truncate.o
+qnx4-objs := inode.o dir.o namei.o bitmap.o
diff --git a/fs/qnx4/bitmap.c b/fs/qnx4/bitmap.c
index e1cd061a25f7..0afba069d567 100644
--- a/fs/qnx4/bitmap.c
+++ b/fs/qnx4/bitmap.c
@@ -78,84 +78,3 @@ unsigned long qnx4_count_free_blocks(struct super_block *sb)
 
         return total_free;
 }
-
-#ifdef CONFIG_QNX4FS_RW
-
-int qnx4_is_free(struct super_block *sb, long block)
-{
-        int start = le32_to_cpu(qnx4_sb(sb)->BitMap->di_first_xtnt.xtnt_blk) - 1;
-        int size = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size);
-        struct buffer_head *bh;
-        const char *g;
-        int ret = -EIO;
-
-        start += block / (QNX4_BLOCK_SIZE * 8);
-        QNX4DEBUG(("qnx4: is_free requesting block [%lu], bitmap in block [%lu]\n",
-                   (unsigned long) block, (unsigned long) start));
-        (void) size;            /* CHECKME */
-        bh = sb_bread(sb, start);
-        if (bh == NULL) {
-                return -EIO;
-        }
-        g = bh->b_data + (block % QNX4_BLOCK_SIZE);
-        if (((*g) & (1 << (block % 8))) == 0) {
-                QNX4DEBUG(("qnx4: is_free -> block is free\n"));
-                ret = 1;
-        } else {
-                QNX4DEBUG(("qnx4: is_free -> block is busy\n"));
-                ret = 0;
-        }
-        brelse(bh);
-
-        return ret;
-}
-
-int qnx4_set_bitmap(struct super_block *sb, long block, int busy)
-{
-        int start = le32_to_cpu(qnx4_sb(sb)->BitMap->di_first_xtnt.xtnt_blk) - 1;
-        int size = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size);
-        struct buffer_head *bh;
-        char *g;
-
-        start += block / (QNX4_BLOCK_SIZE * 8);
-        QNX4DEBUG(("qnx4: set_bitmap requesting block [%lu], bitmap in block [%lu]\n",
-                   (unsigned long) block, (unsigned long) start));
-        (void) size;            /* CHECKME */
-        bh = sb_bread(sb, start);
-        if (bh == NULL) {
-                return -EIO;
-        }
-        g = bh->b_data + (block % QNX4_BLOCK_SIZE);
-        if (busy == 0) {
-                (*g) &= ~(1 << (block % 8));
-        } else {
-                (*g) |= (1 << (block % 8));
-        }
-        mark_buffer_dirty(bh);
-        brelse(bh);
-
-        return 0;
-}
-
-static void qnx4_clear_inode(struct inode *inode)
-{
-        struct qnx4_inode_entry *qnx4_ino = qnx4_raw_inode(inode);
-        /* What for? */
-        memset(qnx4_ino->di_fname, 0, sizeof qnx4_ino->di_fname);
-        qnx4_ino->di_size = 0;
-        qnx4_ino->di_num_xtnts = 0;
-        qnx4_ino->di_mode = 0;
-        qnx4_ino->di_status = 0;
-}
-
-void qnx4_free_inode(struct inode *inode)
-{
-        if (inode->i_ino < 1) {
-                printk("free_inode: inode 0 or nonexistent inode\n");
-                return;
-        }
-        qnx4_clear_inode(inode);
-        clear_inode(inode);
-}
-
-#endif
diff --git a/fs/qnx4/dir.c b/fs/qnx4/dir.c
index 003c68f3238b..86cc39cb1398 100644
--- a/fs/qnx4/dir.c
+++ b/fs/qnx4/dir.c
@@ -85,9 +85,4 @@ const struct file_operations qnx4_dir_operations =
 const struct inode_operations qnx4_dir_inode_operations =
 {
         .lookup         = qnx4_lookup,
-#ifdef CONFIG_QNX4FS_RW
-        .create         = qnx4_create,
-        .unlink         = qnx4_unlink,
-        .rmdir          = qnx4_rmdir,
-#endif
 };
diff --git a/fs/qnx4/file.c b/fs/qnx4/file.c
deleted file mode 100644
index 09b170ac936c..000000000000
--- a/fs/qnx4/file.c
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * QNX4 file system, Linux implementation.
- *
- * Version : 0.2.1
- *
- * Using parts of the xiafs filesystem.
- *
- * History :
- *
- * 25-05-1998 by Richard Frowijn : first release.
- * 21-06-1998 by Frank Denis : wrote qnx4_readpage to use generic_file_read.
- * 27-06-1998 by Frank Denis : file overwriting.
- */
-
-#include "qnx4.h"
-
-/*
- * We have mostly NULL's here: the current defaults are ok for
- * the qnx4 filesystem.
- */
-const struct file_operations qnx4_file_operations =
-{
-        .llseek         = generic_file_llseek,
-        .read           = do_sync_read,
-        .aio_read       = generic_file_aio_read,
-        .mmap           = generic_file_mmap,
-        .splice_read    = generic_file_splice_read,
-#ifdef CONFIG_QNX4FS_RW
-        .write          = do_sync_write,
-        .aio_write      = generic_file_aio_write,
-        .fsync          = simple_fsync,
-#endif
-};
-
-const struct inode_operations qnx4_file_inode_operations =
-{
-#ifdef CONFIG_QNX4FS_RW
-        .truncate       = qnx4_truncate,
-#endif
-};
diff --git a/fs/qnx4/inode.c b/fs/qnx4/inode.c
index 681df5fcd161..d2cd1798d8c4 100644
--- a/fs/qnx4/inode.c
+++ b/fs/qnx4/inode.c
@@ -28,73 +28,6 @@
 
 static const struct super_operations qnx4_sops;
 
-#ifdef CONFIG_QNX4FS_RW
-
-static void qnx4_delete_inode(struct inode *inode)
-{
-        QNX4DEBUG(("qnx4: deleting inode [%lu]\n", (unsigned long) inode->i_ino));
-        truncate_inode_pages(&inode->i_data, 0);
-        inode->i_size = 0;
-        qnx4_truncate(inode);
-        lock_kernel();
-        qnx4_free_inode(inode);
-        unlock_kernel();
-}
-
-static int qnx4_write_inode(struct inode *inode, int do_sync)
-{
-        struct qnx4_inode_entry *raw_inode;
-        int block, ino;
-        struct buffer_head *bh;
-        ino = inode->i_ino;
-
-        QNX4DEBUG(("qnx4: write inode 1.\n"));
-        if (inode->i_nlink == 0) {
-                return 0;
-        }
-        if (!ino) {
-                printk("qnx4: bad inode number on dev %s: %d is out of range\n",
-                       inode->i_sb->s_id, ino);
-                return -EIO;
-        }
-        QNX4DEBUG(("qnx4: write inode 2.\n"));
-        block = ino / QNX4_INODES_PER_BLOCK;
-        lock_kernel();
-        if (!(bh = sb_bread(inode->i_sb, block))) {
-                printk("qnx4: major problem: unable to read inode from dev "
-                       "%s\n", inode->i_sb->s_id);
-                unlock_kernel();
-                return -EIO;
-        }
-        raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
-            (ino % QNX4_INODES_PER_BLOCK);
-        raw_inode->di_mode  = cpu_to_le16(inode->i_mode);
-        raw_inode->di_uid   = cpu_to_le16(fs_high2lowuid(inode->i_uid));
-        raw_inode->di_gid   = cpu_to_le16(fs_high2lowgid(inode->i_gid));
-        raw_inode->di_nlink = cpu_to_le16(inode->i_nlink);
-        raw_inode->di_size  = cpu_to_le32(inode->i_size);
-        raw_inode->di_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
-        raw_inode->di_atime = cpu_to_le32(inode->i_atime.tv_sec);
-        raw_inode->di_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
-        raw_inode->di_first_xtnt.xtnt_size = cpu_to_le32(inode->i_blocks);
-        mark_buffer_dirty(bh);
-        if (do_sync) {
-                sync_dirty_buffer(bh);
-                if (buffer_req(bh) && !buffer_uptodate(bh)) {
-                        printk("qnx4: IO error syncing inode [%s:%08x]\n",
-                                        inode->i_sb->s_id, ino);
-                        brelse(bh);
-                        unlock_kernel();
-                        return -EIO;
-                }
-        }
-        brelse(bh);
-        unlock_kernel();
-        return 0;
-}
-
-#endif
-
 static void qnx4_put_super(struct super_block *sb);
 static struct inode *qnx4_alloc_inode(struct super_block *sb);
 static void qnx4_destroy_inode(struct inode *inode);
@@ -108,10 +41,6 @@ static const struct super_operations qnx4_sops =
         .put_super      = qnx4_put_super,
         .statfs         = qnx4_statfs,
         .remount_fs     = qnx4_remount,
-#ifdef CONFIG_QNX4FS_RW
-        .write_inode    = qnx4_write_inode,
-        .delete_inode   = qnx4_delete_inode,
-#endif
 };
 
 static int qnx4_remount(struct super_block *sb, int *flags, char *data)
@@ -120,15 +49,7 @@ static int qnx4_remount(struct super_block *sb, int *flags, char *data)
 
         qs = qnx4_sb(sb);
         qs->Version = QNX4_VERSION;
-#ifndef CONFIG_QNX4FS_RW
         *flags |= MS_RDONLY;
-#endif
-        if (*flags & MS_RDONLY) {
-                return 0;
-        }
-
-        mark_buffer_dirty(qs->sb_buf);
-
         return 0;
 }
 
@@ -354,9 +275,7 @@ static int qnx4_fill_super(struct super_block *s, void *data, int silent)
         }
         s->s_op = &qnx4_sops;
         s->s_magic = QNX4_SUPER_MAGIC;
-#ifndef CONFIG_QNX4FS_RW
         s->s_flags |= MS_RDONLY;        /* Yup, read-only yet */
-#endif
         qnx4_sb(s)->sb_buf = bh;
         qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data;
 
@@ -489,8 +408,7 @@ struct inode *qnx4_iget(struct super_block *sb, unsigned long ino)
 
         memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
         if (S_ISREG(inode->i_mode)) {
-                inode->i_op = &qnx4_file_inode_operations;
-                inode->i_fop = &qnx4_file_operations;
+                inode->i_fop = &generic_ro_fops;
                 inode->i_mapping->a_ops = &qnx4_aops;
                 qnx4_i(inode)->mmu_private = inode->i_size;
         } else if (S_ISDIR(inode->i_mode)) {
diff --git a/fs/qnx4/namei.c b/fs/qnx4/namei.c
index 5972ed214937..ae1e7edbacd6 100644
--- a/fs/qnx4/namei.c
+++ b/fs/qnx4/namei.c
@@ -134,108 +134,3 @@ out:
 
         return NULL;
 }
-
-#ifdef CONFIG_QNX4FS_RW
-int qnx4_create(struct inode *dir, struct dentry *dentry, int mode,
-                struct nameidata *nd)
-{
-        QNX4DEBUG(("qnx4: qnx4_create\n"));
-        if (dir == NULL) {
-                return -ENOENT;
-        }
-        return -ENOSPC;
-}
-
-int qnx4_rmdir(struct inode *dir, struct dentry *dentry)
-{
-        struct buffer_head *bh;
-        struct qnx4_inode_entry *de;
-        struct inode *inode;
-        int retval;
-        int ino;
-
-        QNX4DEBUG(("qnx4: qnx4_rmdir [%s]\n", dentry->d_name.name));
-        lock_kernel();
-        bh = qnx4_find_entry(dentry->d_name.len, dir, dentry->d_name.name,
-                             &de, &ino);
-        if (bh == NULL) {
-                unlock_kernel();
-                return -ENOENT;
-        }
-        inode = dentry->d_inode;
-        if (inode->i_ino != ino) {
-                retval = -EIO;
-                goto end_rmdir;
-        }
-#if 0
-        if (!empty_dir(inode)) {
-                retval = -ENOTEMPTY;
-                goto end_rmdir;
-        }
-#endif
-        if (inode->i_nlink != 2) {
-                QNX4DEBUG(("empty directory has nlink!=2 (%d)\n", inode->i_nlink));
-        }
-        QNX4DEBUG(("qnx4: deleting directory\n"));
-        de->di_status = 0;
-        memset(de->di_fname, 0, sizeof de->di_fname);
-        de->di_mode = 0;
-        mark_buffer_dirty_inode(bh, dir);
-        clear_nlink(inode);
-        mark_inode_dirty(inode);
-        inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
-        inode_dec_link_count(dir);
-        retval = 0;
-
-      end_rmdir:
-        brelse(bh);
-
-        unlock_kernel();
-        return retval;
-}
-
-int qnx4_unlink(struct inode *dir, struct dentry *dentry)
-{
-        struct buffer_head *bh;
-        struct qnx4_inode_entry *de;
-        struct inode *inode;
-        int retval;
-        int ino;
-
-        QNX4DEBUG(("qnx4: qnx4_unlink [%s]\n", dentry->d_name.name));
-        lock_kernel();
-        bh = qnx4_find_entry(dentry->d_name.len, dir, dentry->d_name.name,
-                             &de, &ino);
-        if (bh == NULL) {
-                unlock_kernel();
-                return -ENOENT;
-        }
-        inode = dentry->d_inode;
-        if (inode->i_ino != ino) {
-                retval = -EIO;
-                goto end_unlink;
-        }
-        retval = -EPERM;
-        if (!inode->i_nlink) {
-                QNX4DEBUG(("Deleting nonexistent file (%s:%lu), %d\n",
-                           inode->i_sb->s_id,
-                           inode->i_ino, inode->i_nlink));
-                inode->i_nlink = 1;
-        }
-        de->di_status = 0;
-        memset(de->di_fname, 0, sizeof de->di_fname);
-        de->di_mode = 0;
-        mark_buffer_dirty_inode(bh, dir);
-        dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
-        mark_inode_dirty(dir);
-        inode->i_ctime = dir->i_ctime;
-        inode_dec_link_count(inode);
-        retval = 0;
-
-end_unlink:
-        unlock_kernel();
-        brelse(bh);
-
-        return retval;
-}
-#endif
diff --git a/fs/qnx4/qnx4.h b/fs/qnx4/qnx4.h
index 9efc089454f6..33a60858203b 100644
--- a/fs/qnx4/qnx4.h
+++ b/fs/qnx4/qnx4.h
@@ -29,17 +29,9 @@ extern unsigned long qnx4_block_map(struct inode *inode, long iblock);
 
 extern struct buffer_head *qnx4_bread(struct inode *, int, int);
 
-extern const struct inode_operations qnx4_file_inode_operations;
 extern const struct inode_operations qnx4_dir_inode_operations;
-extern const struct file_operations qnx4_file_operations;
 extern const struct file_operations qnx4_dir_operations;
 extern int qnx4_is_free(struct super_block *sb, long block);
-extern int qnx4_set_bitmap(struct super_block *sb, long block, int busy);
-extern int qnx4_create(struct inode *inode, struct dentry *dentry, int mode, struct nameidata *nd);
-extern void qnx4_truncate(struct inode *inode);
-extern void qnx4_free_inode(struct inode *inode);
-extern int qnx4_unlink(struct inode *dir, struct dentry *dentry);
-extern int qnx4_rmdir(struct inode *dir, struct dentry *dentry);
 
 static inline struct qnx4_sb_info *qnx4_sb(struct super_block *sb)
 {
diff --git a/fs/qnx4/truncate.c b/fs/qnx4/truncate.c
deleted file mode 100644
index d94d9ee241fe..000000000000
--- a/fs/qnx4/truncate.c
+++ /dev/null
@@ -1,34 +0,0 @@
-/* 
- * QNX4 file system, Linux implementation.
- * 
- * Version : 0.1
- * 
- * Using parts of the xiafs filesystem.
- * 
- * History :
- * 
- * 30-06-1998 by Frank DENIS : ugly filler.
- */
-
-#include <linux/smp_lock.h>
-#include "qnx4.h"
-
-#ifdef CONFIG_QNX4FS_RW
-
-void qnx4_truncate(struct inode *inode)
-{
-        if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
-              S_ISLNK(inode->i_mode))) {
-                return;
-        }
-        lock_kernel();
-        if (!(S_ISDIR(inode->i_mode))) {
-                /* TODO */
-        }
-        QNX4DEBUG(("qnx4: qnx4_truncate called\n"));
-        inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
-        mark_inode_dirty(inode);
-        unlock_kernel();
-}
-
-#endif
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 38f7bd559f35..39b49c42a7ed 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -1839,7 +1839,7 @@ EXPORT_SYMBOL(dquot_commit_info);
 /*
  * Definitions of diskquota operations.
  */
-struct dquot_operations dquot_operations = {
+const struct dquot_operations dquot_operations = {
         .initialize     = dquot_initialize,
         .drop           = dquot_drop,
         .alloc_space    = dquot_alloc_space,
@@ -2461,7 +2461,7 @@ out:
 }
 EXPORT_SYMBOL(vfs_set_dqinfo);
 
-struct quotactl_ops vfs_quotactl_ops = {
+const struct quotactl_ops vfs_quotactl_ops = {
         .quota_on       = vfs_quota_on,
         .quota_off      = vfs_quota_off,
         .quota_sync     = vfs_quota_sync,
diff --git a/fs/ramfs/file-nommu.c b/fs/ramfs/file-nommu.c
index 11f0c06316de..32fae4040ebf 100644
--- a/fs/ramfs/file-nommu.c
+++ b/fs/ramfs/file-nommu.c
@@ -69,14 +69,11 @@ int ramfs_nommu_expand_for_mapping(struct inode *inode, size_t newsize)
         /* make various checks */
         order = get_order(newsize);
         if (unlikely(order >= MAX_ORDER))
-                goto too_big;
+                return -EFBIG;
 
-        limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
-        if (limit != RLIM_INFINITY && newsize > limit)
-                goto fsize_exceeded;
-
-        if (newsize > inode->i_sb->s_maxbytes)
-                goto too_big;
+        ret = inode_newsize_ok(inode, newsize);
+        if (ret)
+                return ret;
 
         i_size_write(inode, newsize);
 
@@ -118,12 +115,7 @@ int ramfs_nommu_expand_for_mapping(struct inode *inode, size_t newsize)
 
         return 0;
 
- fsize_exceeded:
-        send_sig(SIGXFSZ, current, 0);
- too_big:
-        return -EFBIG;
-
- add_error:
+add_error:
         while (loop < npages)
                 __free_page(pages + loop++);
         return ret;
diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c
index a7f0110fca4c..a6090aa1a7c1 100644
--- a/fs/ramfs/inode.c
+++ b/fs/ramfs/inode.c
@@ -34,12 +34,10 @@
 #include <linux/ramfs.h>
 #include <linux/sched.h>
 #include <linux/parser.h>
+#include <linux/magic.h>
 #include <asm/uaccess.h>
 #include "internal.h"
 
-/* some random number */
-#define RAMFS_MAGIC     0x858458f6
-
 #define RAMFS_DEFAULT_MODE      0755
 
 static const struct super_operations ramfs_ops;
diff --git a/fs/read_write.c b/fs/read_write.c
index 6c8c55dec2bc..3ac28987f22a 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -839,9 +839,6 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
                 max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes);
 
         pos = *ppos;
-        retval = -EINVAL;
-        if (unlikely(pos < 0))
-                goto fput_out;
         if (unlikely(pos + count > max)) {
                 retval = -EOVERFLOW;
                 if (pos >= max)
diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index 7adea74d6a8a..f0ad05f38022 100644
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -612,7 +612,7 @@ static int reiserfs_mark_dquot_dirty(struct dquot *);
 static int reiserfs_write_info(struct super_block *, int);
 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
 
-static struct dquot_operations reiserfs_quota_operations = {
+static const struct dquot_operations reiserfs_quota_operations = {
         .initialize = dquot_initialize,
         .drop = dquot_drop,
         .alloc_space = dquot_alloc_space,
@@ -629,7 +629,7 @@ static struct dquot_operations reiserfs_quota_operations = {
         .destroy_dquot  = dquot_destroy,
 };
 
-static struct quotactl_ops reiserfs_qctl_operations = {
+static const struct quotactl_ops reiserfs_qctl_operations = {
         .quota_on = reiserfs_quota_on,
         .quota_off = vfs_quota_off,
         .quota_sync = vfs_quota_sync,
diff --git a/fs/romfs/super.c b/fs/romfs/super.c
index 4ab3c03d8f95..c117fa80d1e9 100644
--- a/fs/romfs/super.c
+++ b/fs/romfs/super.c
@@ -284,7 +284,7 @@ static const struct file_operations romfs_dir_operations = {
         .readdir        = romfs_readdir,
 };
 
-static struct inode_operations romfs_dir_inode_operations = {
+static const struct inode_operations romfs_dir_inode_operations = {
         .lookup         = romfs_lookup,
 };
 
@@ -528,7 +528,7 @@ static int romfs_fill_super(struct super_block *sb, void *data, int silent)
         pos = (ROMFH_SIZE + len + 1 + ROMFH_PAD) & ROMFH_MASK;
 
         root = romfs_iget(sb, pos);
-        if (!root)
+        if (IS_ERR(root))
                 goto error;
 
         sb->s_root = d_alloc_root(root);
diff --git a/fs/select.c b/fs/select.c
index 8084834e123e..fd38ce2e32e3 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -15,6 +15,7 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/sched.h>
 #include <linux/syscalls.h>
 #include <linux/module.h>
 #include <linux/slab.h>
@@ -41,22 +42,28 @@
  * better solutions..
  */
 
+#define MAX_SLACK       (100 * NSEC_PER_MSEC)
+
 static long __estimate_accuracy(struct timespec *tv)
 {
         long slack;
         int divfactor = 1000;
 
+        if (tv->tv_sec < 0)
+                return 0;
+
         if (task_nice(current) > 0)
                 divfactor = divfactor / 5;
 
+        if (tv->tv_sec > MAX_SLACK / (NSEC_PER_SEC/divfactor))
+                return MAX_SLACK;
+
         slack = tv->tv_nsec / divfactor;
         slack += tv->tv_sec * (NSEC_PER_SEC/divfactor);
 
-        if (slack > 100 * NSEC_PER_MSEC)
-                slack =  100 * NSEC_PER_MSEC;
+        if (slack > MAX_SLACK)
+                return MAX_SLACK;
 
-        if (slack < 0)
-                slack = 0;
         return slack;
 }
 
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 6c959275f2d0..eae7d9dbf3ff 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -429,20 +429,21 @@ EXPORT_SYMBOL(mangle_path);
  */
 int seq_path(struct seq_file *m, struct path *path, char *esc)
 {
-        if (m->count < m->size) {
-                char *s = m->buf + m->count;
-                char *p = d_path(path, s, m->size - m->count);
+        char *buf;
+        size_t size = seq_get_buf(m, &buf);
+        int res = -1;
+
+        if (size) {
+                char *p = d_path(path, buf, size);
                 if (!IS_ERR(p)) {
-                        s = mangle_path(s, p, esc);
-                        if (s) {
-                                p = m->buf + m->count;
-                                m->count = s - m->buf;
-                                return s - p;
-                        }
+                        char *end = mangle_path(buf, p, esc);
+                        if (end)
+                                res = end - buf;
                 }
         }
-        m->count = m->size;
-        return -1;
+        seq_commit(m, res);
+
+        return res;
 }
 EXPORT_SYMBOL(seq_path);
 
@@ -454,26 +455,28 @@ EXPORT_SYMBOL(seq_path);
 int seq_path_root(struct seq_file *m, struct path *path, struct path *root,
                   char *esc)
 {
-        int err = -ENAMETOOLONG;
-        if (m->count < m->size) {
-                char *s = m->buf + m->count;
+        char *buf;
+        size_t size = seq_get_buf(m, &buf);
+        int res = -ENAMETOOLONG;
+
+        if (size) {
                 char *p;
 
                 spin_lock(&dcache_lock);
-                p = __d_path(path, root, s, m->size - m->count);
+                p = __d_path(path, root, buf, size);
                 spin_unlock(&dcache_lock);
-                err = PTR_ERR(p);
+                res = PTR_ERR(p);
                 if (!IS_ERR(p)) {
-                        s = mangle_path(s, p, esc);
-                        if (s) {
-                                p = m->buf + m->count;
-                                m->count = s - m->buf;
-                                return 0;
-                        }
+                        char *end = mangle_path(buf, p, esc);
+                        if (end)
+                                res = end - buf;
+                        else
+                                res = -ENAMETOOLONG;
                 }
         }
-        m->count = m->size;
-        return err;
+        seq_commit(m, res);
+
+        return res < 0 ? res : 0;
 }
 
 /*
@@ -481,20 +484,21 @@ int seq_path_root(struct seq_file *m, struct path *path, struct path *root,
  */
 int seq_dentry(struct seq_file *m, struct dentry *dentry, char *esc)
 {
-        if (m->count < m->size) {
-                char *s = m->buf + m->count;
-                char *p = dentry_path(dentry, s, m->size - m->count);
+        char *buf;
+        size_t size = seq_get_buf(m, &buf);
+        int res = -1;
+
+        if (size) {
+                char *p = dentry_path(dentry, buf, size);
                 if (!IS_ERR(p)) {
-                        s = mangle_path(s, p, esc);
-                        if (s) {
-                                p = m->buf + m->count;
-                                m->count = s - m->buf;
-                                return s - p;
-                        }
+                        char *end = mangle_path(buf, p, esc);
+                        if (end)
+                                res = end - buf;
                 }
         }
-        m->count = m->size;
-        return -1;
+        seq_commit(m, res);
+
+        return res;
 }
 
 int seq_bitmap(struct seq_file *m, const unsigned long *bits,
diff --git a/fs/smbfs/inode.c b/fs/smbfs/inode.c
index 1402d2d54f52..1c4c8f089970 100644
--- a/fs/smbfs/inode.c
+++ b/fs/smbfs/inode.c
@@ -459,14 +459,8 @@ smb_show_options(struct seq_file *s, struct vfsmount *m)
 static void
 smb_unload_nls(struct smb_sb_info *server)
 {
-        if (server->remote_nls) {
-                unload_nls(server->remote_nls);
-                server->remote_nls = NULL;
-        }
-        if (server->local_nls) {
-                unload_nls(server->local_nls);
-                server->local_nls = NULL;
-        }
+        unload_nls(server->remote_nls);
+        unload_nls(server->local_nls);
 }
 
 static void
diff --git a/fs/smbfs/proc.c b/fs/smbfs/proc.c
index 9468168b9af5..71c29b6670b4 100644
--- a/fs/smbfs/proc.c
+++ b/fs/smbfs/proc.c
@@ -509,7 +509,7 @@ date_unix2dos(struct smb_sb_info *server,
                 month = 2;
         } else {
                 nl_day = (year & 3) || day <= 59 ? day : day - 1;
-                for (month = 0; month < 12; month++)
+                for (month = 1; month < 12; month++)
                         if (day_n[month] > nl_day)
                                 break;
         }
diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c
index cb5fc57e370b..6c197ef53add 100644
--- a/fs/squashfs/super.c
+++ b/fs/squashfs/super.c
@@ -44,7 +44,7 @@
 #include "squashfs.h"
 
 static struct file_system_type squashfs_fs_type;
-static struct super_operations squashfs_super_ops;
+static const struct super_operations squashfs_super_ops;
 
 static int supported_squashfs_filesystem(short major, short minor, short comp)
 {
@@ -444,7 +444,7 @@ static struct file_system_type squashfs_fs_type = {
         .fs_flags = FS_REQUIRES_DEV
 };
 
-static struct super_operations squashfs_super_ops = {
+static const struct super_operations squashfs_super_ops = {
         .alloc_inode = squashfs_alloc_inode,
         .destroy_inode = squashfs_destroy_inode,
         .statfs = squashfs_statfs,
diff --git a/fs/super.c b/fs/super.c
index b03fea8fbfb6..19eb70b374bc 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -54,7 +54,7 @@ DEFINE_SPINLOCK(sb_lock);
 static struct super_block *alloc_super(struct file_system_type *type)
 {
         struct super_block *s = kzalloc(sizeof(struct super_block),  GFP_USER);
-        static struct super_operations default_op;
+        static const struct super_operations default_op;
 
         if (s) {
                 if (security_sb_alloc(s)) {
@@ -465,6 +465,48 @@ rescan:
 }
 
 EXPORT_SYMBOL(get_super);
+
+/**
+ * get_active_super - get an active reference to the superblock of a device
+ * @bdev: device to get the superblock for
+ *
+ * Scans the superblock list and finds the superblock of the file system
+ * mounted on the device given.  Returns the superblock with an active
+ * reference and s_umount held exclusively or %NULL if none was found.
+ */
+struct super_block *get_active_super(struct block_device *bdev)
+{
+        struct super_block *sb;
+
+        if (!bdev)
+                return NULL;
+
+        spin_lock(&sb_lock);
+        list_for_each_entry(sb, &super_blocks, s_list) {
+                if (sb->s_bdev != bdev)
+                        continue;
+
+                sb->s_count++;
+                spin_unlock(&sb_lock);
+                down_write(&sb->s_umount);
+                if (sb->s_root) {
+                        spin_lock(&sb_lock);
+                        if (sb->s_count > S_BIAS) {
+                                atomic_inc(&sb->s_active);
+                                sb->s_count--;
+                                spin_unlock(&sb_lock);
+                                return sb;
+                        }
+                        spin_unlock(&sb_lock);
+                }
+                up_write(&sb->s_umount);
+                put_super(sb);
+                yield();
+                spin_lock(&sb_lock);
+        }
+        spin_unlock(&sb_lock);
+        return NULL;
+}
  
 struct super_block * user_get_super(dev_t dev)
 {
@@ -527,11 +569,15 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
 {
         int retval;
         int remount_rw;
-        
+
+        if (sb->s_frozen != SB_UNFROZEN)
+                return -EBUSY;
+
 #ifdef CONFIG_BLOCK
         if (!(flags & MS_RDONLY) && bdev_read_only(sb->s_bdev))
                 return -EACCES;
 #endif
+
         if (flags & MS_RDONLY)
                 acct_auto_close(sb);
         shrink_dcache_sb(sb);
@@ -743,9 +789,14 @@ int get_sb_bdev(struct file_system_type *fs_type,
          * will protect the lockfs code from trying to start a snapshot
          * while we are mounting
          */
-        down(&bdev->bd_mount_sem);
+        mutex_lock(&bdev->bd_fsfreeze_mutex);
+        if (bdev->bd_fsfreeze_count > 0) {
+                mutex_unlock(&bdev->bd_fsfreeze_mutex);
+                error = -EBUSY;
+                goto error_bdev;
+        }
         s = sget(fs_type, test_bdev_super, set_bdev_super, bdev);
-        up(&bdev->bd_mount_sem);
+        mutex_unlock(&bdev->bd_fsfreeze_mutex);
         if (IS_ERR(s))
                 goto error_s;
 
@@ -892,6 +943,16 @@ vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void
         if (error)
                 goto out_sb;
 
+        /*
+         * filesystems should never set s_maxbytes larger than MAX_LFS_FILESIZE
+         * but s_maxbytes was an unsigned long long for many releases. Throw
+         * this warning for a little while to try and catch filesystems that
+         * violate this rule. This warning should be either removed or
+         * converted to a BUG() in 2.6.34.
+         */
+        WARN((mnt->mnt_sb->s_maxbytes < 0), "%s set sb->s_maxbytes to "
+                "negative value (%lld)\n", type->name, mnt->mnt_sb->s_maxbytes);
+
         mnt->mnt_mountpoint = mnt->mnt_root;
         mnt->mnt_parent = mnt;
         up_write(&mnt->mnt_sb->s_umount);
diff --git a/fs/sync.c b/fs/sync.c
index c08467a5d7cb..d104591b066b 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -183,6 +183,7 @@ int file_fsync(struct file *filp, struct dentry *dentry, int datasync)
                 ret = err;
         return ret;
 }
+EXPORT_SYMBOL(file_fsync);
 
 /**
  * vfs_fsync_range - helper to sync a range of data & metadata to disk
diff --git a/fs/sysfs/bin.c b/fs/sysfs/bin.c
index 2524714bece1..60c702bc10ae 100644
--- a/fs/sysfs/bin.c
+++ b/fs/sysfs/bin.c
@@ -40,7 +40,7 @@ struct bin_buffer {
         struct mutex                    mutex;
         void                            *buffer;
         int                             mmapped;
-        struct vm_operations_struct     *vm_ops;
+        const struct vm_operations_struct *vm_ops;
         struct file                     *file;
         struct hlist_node               list;
 };
@@ -331,7 +331,7 @@ static int bin_migrate(struct vm_area_struct *vma, const nodemask_t *from,
 }
 #endif
 
-static struct vm_operations_struct bin_vm_ops = {
+static const struct vm_operations_struct bin_vm_ops = {
         .open           = bin_vma_open,
         .close          = bin_vma_close,
         .fault          = bin_fault,
diff --git a/fs/ubifs/budget.c b/fs/ubifs/budget.c
index ee1ce68fd98b..076ca50e9933 100644
--- a/fs/ubifs/budget.c
+++ b/fs/ubifs/budget.c
@@ -715,7 +715,7 @@ long long ubifs_get_free_space_nolock(struct ubifs_info *c)
  * ubifs_get_free_space - return amount of free space.
  * @c: UBIFS file-system description object
  *
- * This function calculates and retuns amount of free space to report to
+ * This function calculates and returns amount of free space to report to
  * user-space.
  */
 long long ubifs_get_free_space(struct ubifs_info *c)
diff --git a/fs/ubifs/commit.c b/fs/ubifs/commit.c
index f3a7945527fb..4775af401167 100644
--- a/fs/ubifs/commit.c
+++ b/fs/ubifs/commit.c
@@ -510,7 +510,7 @@ int dbg_check_old_index(struct ubifs_info *c, struct ubifs_zbranch *zroot)
         int lnum, offs, len, err = 0, uninitialized_var(last_level), child_cnt;
         int first = 1, iip;
         struct ubifs_debug_info *d = c->dbg;
-        union ubifs_key lower_key, upper_key, l_key, u_key;
+        union ubifs_key uninitialized_var(lower_key), upper_key, l_key, u_key;
         unsigned long long uninitialized_var(last_sqnum);
         struct ubifs_idx_node *idx;
         struct list_head list;
diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c
index ce2cd8343618..dbc093afd946 100644
--- a/fs/ubifs/debug.c
+++ b/fs/ubifs/debug.c
@@ -210,6 +210,20 @@ const char *dbg_cstate(int cmt_state)
         }
 }
 
+const char *dbg_jhead(int jhead)
+{
+        switch (jhead) {
+        case GCHD:
+                return "0 (GC)";
+        case BASEHD:
+                return "1 (base)";
+        case DATAHD:
+                return "2 (data)";
+        default:
+                return "unknown journal head";
+        }
+}
+
 static void dump_ch(const struct ubifs_ch *ch)
 {
         printk(KERN_DEBUG "\tmagic          %#x\n", le32_to_cpu(ch->magic));
@@ -623,8 +637,9 @@ void dbg_dump_budg(struct ubifs_info *c)
         /* If we are in R/O mode, journal heads do not exist */
         if (c->jheads)
                 for (i = 0; i < c->jhead_cnt; i++)
-                        printk(KERN_DEBUG "\tjhead %d\t LEB %d\n",
-                               c->jheads[i].wbuf.jhead, c->jheads[i].wbuf.lnum);
+                        printk(KERN_DEBUG "\tjhead %s\t LEB %d\n",
+                               dbg_jhead(c->jheads[i].wbuf.jhead),
+                               c->jheads[i].wbuf.lnum);
         for (rb = rb_first(&c->buds); rb; rb = rb_next(rb)) {
                 bud = rb_entry(rb, struct ubifs_bud, rb);
                 printk(KERN_DEBUG "\tbud LEB %d\n", bud->lnum);
@@ -648,9 +663,90 @@ void dbg_dump_budg(struct ubifs_info *c)
 
 void dbg_dump_lprop(const struct ubifs_info *c, const struct ubifs_lprops *lp)
 {
-        printk(KERN_DEBUG "LEB %d lprops: free %d, dirty %d (used %d), "
-               "flags %#x\n", lp->lnum, lp->free, lp->dirty,
-               c->leb_size - lp->free - lp->dirty, lp->flags);
+        int i, spc, dark = 0, dead = 0;
+        struct rb_node *rb;
+        struct ubifs_bud *bud;
+
+        spc = lp->free + lp->dirty;
+        if (spc < c->dead_wm)
+                dead = spc;
+        else
+                dark = ubifs_calc_dark(c, spc);
+
+        if (lp->flags & LPROPS_INDEX)
+                printk(KERN_DEBUG "LEB %-7d free %-8d dirty %-8d used %-8d "
+                       "free + dirty %-8d flags %#x (", lp->lnum, lp->free,
+                       lp->dirty, c->leb_size - spc, spc, lp->flags);
+        else
+                printk(KERN_DEBUG "LEB %-7d free %-8d dirty %-8d used %-8d "
+                       "free + dirty %-8d dark %-4d dead %-4d nodes fit %-3d "
+                       "flags %#-4x (", lp->lnum, lp->free, lp->dirty,
+                       c->leb_size - spc, spc, dark, dead,
+                       (int)(spc / UBIFS_MAX_NODE_SZ), lp->flags);
+
+        if (lp->flags & LPROPS_TAKEN) {
+                if (lp->flags & LPROPS_INDEX)
+                        printk(KERN_CONT "index, taken");
+                else
+                        printk(KERN_CONT "taken");
+        } else {
+                const char *s;
+
+                if (lp->flags & LPROPS_INDEX) {
+                        switch (lp->flags & LPROPS_CAT_MASK) {
+                        case LPROPS_DIRTY_IDX:
+                                s = "dirty index";
+                                break;
+                        case LPROPS_FRDI_IDX:
+                                s = "freeable index";
+                                break;
+                        default:
+                                s = "index";
+                        }
+                } else {
+                        switch (lp->flags & LPROPS_CAT_MASK) {
+                        case LPROPS_UNCAT:
+                                s = "not categorized";
+                                break;
+                        case LPROPS_DIRTY:
+                                s = "dirty";
+                                break;
+                        case LPROPS_FREE:
+                                s = "free";
+                                break;
+                        case LPROPS_EMPTY:
+                                s = "empty";
+                                break;
+                        case LPROPS_FREEABLE:
+                                s = "freeable";
+                                break;
+                        default:
+                                s = NULL;
+                                break;
+                        }
+                }
+                printk(KERN_CONT "%s", s);
+        }
+
+        for (rb = rb_first((struct rb_root *)&c->buds); rb; rb = rb_next(rb)) {
+                bud = rb_entry(rb, struct ubifs_bud, rb);
+                if (bud->lnum == lp->lnum) {
+                        int head = 0;
+                        for (i = 0; i < c->jhead_cnt; i++) {
+                                if (lp->lnum == c->jheads[i].wbuf.lnum) {
+                                        printk(KERN_CONT ", jhead %s",
+                                               dbg_jhead(i));
+                                        head = 1;
+                                }
+                        }
+                        if (!head)
+                                printk(KERN_CONT ", bud of jhead %s",
+                                       dbg_jhead(bud->jhead));
+                }
+        }
+        if (lp->lnum == c->gc_lnum)
+                printk(KERN_CONT ", GC LEB");
+        printk(KERN_CONT ")\n");
 }
 
 void dbg_dump_lprops(struct ubifs_info *c)
@@ -724,7 +820,7 @@ void dbg_dump_leb(const struct ubifs_info *c, int lnum)
 
         printk(KERN_DEBUG "(pid %d) start dumping LEB %d\n",
                current->pid, lnum);
-        sleb = ubifs_scan(c, lnum, 0, c->dbg->buf);
+        sleb = ubifs_scan(c, lnum, 0, c->dbg->buf, 0);
         if (IS_ERR(sleb)) {
                 ubifs_err("scan error %d", (int)PTR_ERR(sleb));
                 return;
@@ -909,8 +1005,10 @@ out:
         ubifs_msg("saved lprops statistics dump");
         dbg_dump_lstats(&d->saved_lst);
         ubifs_get_lp_stats(c, &lst);
+
         ubifs_msg("current lprops statistics dump");
-        dbg_dump_lstats(&d->saved_lst);
+        dbg_dump_lstats(&lst);
+
         spin_lock(&c->space_lock);
         dbg_dump_budg(c);
         spin_unlock(&c->space_lock);
diff --git a/fs/ubifs/debug.h b/fs/ubifs/debug.h
index c1cd73b2e06e..29d960101ea6 100644
--- a/fs/ubifs/debug.h
+++ b/fs/ubifs/debug.h
@@ -271,6 +271,7 @@ void ubifs_debugging_exit(struct ubifs_info *c);
 /* Dump functions */
 const char *dbg_ntype(int type);
 const char *dbg_cstate(int cmt_state);
+const char *dbg_jhead(int jhead);
 const char *dbg_get_key_dump(const struct ubifs_info *c,
                              const union ubifs_key *key);
 void dbg_dump_inode(const struct ubifs_info *c, const struct inode *inode);
@@ -321,6 +322,8 @@ void dbg_check_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap, int cat,
 int dbg_check_lprops(struct ubifs_info *c);
 int dbg_check_lpt_nodes(struct ubifs_info *c, struct ubifs_cnode *cnode,
                         int row, int col);
+int dbg_check_inode_size(struct ubifs_info *c, const struct inode *inode,
+                         loff_t size);
 
 /* Force the use of in-the-gaps method for testing */
 
@@ -425,6 +428,7 @@ void dbg_debugfs_exit_fs(struct ubifs_info *c);
 
 #define dbg_ntype(type)                        ""
 #define dbg_cstate(cmt_state)                  ""
+#define dbg_jhead(jhead)                       ""
 #define dbg_get_key_dump(c, key)               ({})
 #define dbg_dump_inode(c, inode)               ({})
 #define dbg_dump_node(c, node)                 ({})
@@ -460,6 +464,7 @@ void dbg_debugfs_exit_fs(struct ubifs_info *c);
 #define dbg_check_heap(c, heap, cat, add_pos)      ({})
 #define dbg_check_lprops(c)                        0
 #define dbg_check_lpt_nodes(c, cnode, row, col)    0
+#define dbg_check_inode_size(c, inode, size)       0
 #define dbg_force_in_the_gaps_enabled              0
 #define dbg_force_in_the_gaps()                    0
 #define dbg_failure_mode                           0
diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index 6d34dc7e33e1..1009adc8d602 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -21,34 +21,32 @@
  */
 
 /*
- * This file implements VFS file and inode operations of regular files, device
+ * This file implements VFS file and inode operations for regular files, device
  * nodes and symlinks as well as address space operations.
  *
- * UBIFS uses 2 page flags: PG_private and PG_checked. PG_private is set if the
- * page is dirty and is used for budgeting purposes - dirty pages should not be
- * budgeted. The PG_checked flag is set if full budgeting is required for the
- * page e.g., when it corresponds to a file hole or it is just beyond the file
- * size. The budgeting is done in 'ubifs_write_begin()', because it is OK to
- * fail in this function, and the budget is released in 'ubifs_write_end()'. So
- * the PG_private and PG_checked flags carry the information about how the page
- * was budgeted, to make it possible to release the budget properly.
+ * UBIFS uses 2 page flags: @PG_private and @PG_checked. @PG_private is set if
+ * the page is dirty and is used for optimization purposes - dirty pages are
+ * not budgeted so the flag shows that 'ubifs_write_end()' should not release
+ * the budget for this page. The @PG_checked flag is set if full budgeting is
+ * required for the page e.g., when it corresponds to a file hole or it is
+ * beyond the file size. The budgeting is done in 'ubifs_write_begin()', because
+ * it is OK to fail in this function, and the budget is released in
+ * 'ubifs_write_end()'. So the @PG_private and @PG_checked flags carry
+ * information about how the page was budgeted, to make it possible to release
+ * the budget properly.
  *
- * A thing to keep in mind: inode's 'i_mutex' is locked in most VFS operations
- * we implement. However, this is not true for '->writepage()', which might be
- * called with 'i_mutex' unlocked. For example, when pdflush is performing
- * write-back, it calls 'writepage()' with unlocked 'i_mutex', although the
- * inode has 'I_LOCK' flag in this case. At "normal" work-paths 'i_mutex' is
- * locked in '->writepage', e.g. in "sys_write -> alloc_pages -> direct reclaim
- * path'. So, in '->writepage()' we are only guaranteed that the page is
- * locked.
+ * A thing to keep in mind: inode @i_mutex is locked in most VFS operations we
+ * implement. However, this is not true for 'ubifs_writepage()', which may be
+ * called with @i_mutex unlocked. For example, when pdflush is doing background
+ * write-back, it calls 'ubifs_writepage()' with unlocked @i_mutex. At "normal"
+ * work-paths the @i_mutex is locked in 'ubifs_writepage()', e.g. in the
+ * "sys_write -> alloc_pages -> direct reclaim path". So, in 'ubifs_writepage()'
+ * we are only guaranteed that the page is locked.
  *
- * Similarly, 'i_mutex' does not have to be locked in readpage(), e.g.,
- * readahead path does not have it locked ("sys_read -> generic_file_aio_read
- * -> ondemand_readahead -> readpage"). In case of readahead, 'I_LOCK' flag is
- * not set as well. However, UBIFS disables readahead.
- *
- * This, for example means that there might be 2 concurrent '->writepage()'
- * calls for the same inode, but different inode dirty pages.
+ * Similarly, @i_mutex is not always locked in 'ubifs_readpage()', e.g., the
+ * read-ahead path does not lock it ("sys_read -> generic_file_aio_read ->
+ * ondemand_readahead -> readpage"). In case of readahead, @I_LOCK flag is not
+ * set as well. However, UBIFS disables readahead.
  */
 
 #include "ubifs.h"
@@ -449,9 +447,9 @@ static int ubifs_write_begin(struct file *file, struct address_space *mapping,
                         /*
                          * We change whole page so no need to load it. But we
                          * have to set the @PG_checked flag to make the further
-                         * code the page is new. This might be not true, but it
-                         * is better to budget more that to read the page from
-                         * the media.
+                         * code know that the page is new. This might be not
+                         * true, but it is better to budget more than to read
+                         * the page from the media.
                          */
                         SetPageChecked(page);
                         skipped_read = 1;
@@ -497,8 +495,8 @@ static int ubifs_write_begin(struct file *file, struct address_space *mapping,
         }
 
         /*
-         * Whee, we aquired budgeting quickly - without involving
-         * garbage-collection, committing or forceing write-back. We return
+         * Whee, we acquired budgeting quickly - without involving
+         * garbage-collection, committing or forcing write-back. We return
          * with @ui->ui_mutex locked if we are appending pages, and unlocked
          * otherwise. This is an optimization (slightly hacky though).
          */
@@ -562,7 +560,7 @@ static int ubifs_write_end(struct file *file, struct address_space *mapping,
 
                 /*
                  * Return 0 to force VFS to repeat the whole operation, or the
-                 * error code if 'do_readpage()' failes.
+                 * error code if 'do_readpage()' fails.
                  */
                 copied = do_readpage(page);
                 goto out;
@@ -1175,11 +1173,11 @@ static int do_truncation(struct ubifs_info *c, struct inode *inode,
         ui->ui_size = inode->i_size;
         /* Truncation changes inode [mc]time */
         inode->i_mtime = inode->i_ctime = ubifs_current_time(inode);
-        /* The other attributes may be changed at the same time as well */
+        /* Other attributes may be changed at the same time as well */
         do_attr_changes(inode, attr);
-
         err = ubifs_jnl_truncate(c, inode, old_size, new_size);
         mutex_unlock(&ui->ui_mutex);
+
 out_budg:
         if (budgeted)
                 ubifs_release_budget(c, &req);
@@ -1536,7 +1534,7 @@ out_unlock:
         return err;
 }
 
-static struct vm_operations_struct ubifs_file_vm_ops = {
+static const struct vm_operations_struct ubifs_file_vm_ops = {
         .fault        = filemap_fault,
         .page_mkwrite = ubifs_vm_page_mkwrite,
 };
diff --git a/fs/ubifs/gc.c b/fs/ubifs/gc.c
index f0f5f15d384e..618c2701d3a7 100644
--- a/fs/ubifs/gc.c
+++ b/fs/ubifs/gc.c
@@ -529,7 +529,7 @@ int ubifs_garbage_collect_leb(struct ubifs_info *c, struct ubifs_lprops *lp)
          * We scan the entire LEB even though we only really need to scan up to
          * (c->leb_size - lp->free).
          */
-        sleb = ubifs_scan(c, lnum, 0, c->sbuf);
+        sleb = ubifs_scan(c, lnum, 0, c->sbuf, 0);
         if (IS_ERR(sleb))
                 return PTR_ERR(sleb);
 
diff --git a/fs/ubifs/io.c b/fs/ubifs/io.c
index 762a7d6cec73..e589fedaf1ef 100644
--- a/fs/ubifs/io.c
+++ b/fs/ubifs/io.c
@@ -297,7 +297,7 @@ static enum hrtimer_restart wbuf_timer_callback_nolock(struct hrtimer *timer)
 {
         struct ubifs_wbuf *wbuf = container_of(timer, struct ubifs_wbuf, timer);
 
-        dbg_io("jhead %d", wbuf->jhead);
+        dbg_io("jhead %s", dbg_jhead(wbuf->jhead));
         wbuf->need_sync = 1;
         wbuf->c->need_wbuf_sync = 1;
         ubifs_wake_up_bgt(wbuf->c);
@@ -314,7 +314,8 @@ static void new_wbuf_timer_nolock(struct ubifs_wbuf *wbuf)
 
         if (wbuf->no_timer)
                 return;
-        dbg_io("set timer for jhead %d, %llu-%llu millisecs", wbuf->jhead,
+        dbg_io("set timer for jhead %s, %llu-%llu millisecs",
+               dbg_jhead(wbuf->jhead),
                div_u64(ktime_to_ns(wbuf->softlimit), USEC_PER_SEC),
                div_u64(ktime_to_ns(wbuf->softlimit) + wbuf->delta,
                        USEC_PER_SEC));
@@ -351,8 +352,8 @@ int ubifs_wbuf_sync_nolock(struct ubifs_wbuf *wbuf)
                 /* Write-buffer is empty or not seeked */
                 return 0;
 
-        dbg_io("LEB %d:%d, %d bytes, jhead %d",
-               wbuf->lnum, wbuf->offs, wbuf->used, wbuf->jhead);
+        dbg_io("LEB %d:%d, %d bytes, jhead %s",
+               wbuf->lnum, wbuf->offs, wbuf->used, dbg_jhead(wbuf->jhead));
         ubifs_assert(!(c->vfs_sb->s_flags & MS_RDONLY));
         ubifs_assert(!(wbuf->avail & 7));
         ubifs_assert(wbuf->offs + c->min_io_size <= c->leb_size);
@@ -401,7 +402,7 @@ int ubifs_wbuf_seek_nolock(struct ubifs_wbuf *wbuf, int lnum, int offs,
 {
         const struct ubifs_info *c = wbuf->c;
 
-        dbg_io("LEB %d:%d, jhead %d", lnum, offs, wbuf->jhead);
+        dbg_io("LEB %d:%d, jhead %s", lnum, offs, dbg_jhead(wbuf->jhead));
         ubifs_assert(lnum >= 0 && lnum < c->leb_cnt);
         ubifs_assert(offs >= 0 && offs <= c->leb_size);
         ubifs_assert(offs % c->min_io_size == 0 && !(offs & 7));
@@ -508,9 +509,9 @@ int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len)
         struct ubifs_info *c = wbuf->c;
         int err, written, n, aligned_len = ALIGN(len, 8), offs;
 
-        dbg_io("%d bytes (%s) to jhead %d wbuf at LEB %d:%d", len,
-               dbg_ntype(((struct ubifs_ch *)buf)->node_type), wbuf->jhead,
-               wbuf->lnum, wbuf->offs + wbuf->used);
+        dbg_io("%d bytes (%s) to jhead %s wbuf at LEB %d:%d", len,
+               dbg_ntype(((struct ubifs_ch *)buf)->node_type),
+               dbg_jhead(wbuf->jhead), wbuf->lnum, wbuf->offs + wbuf->used);
         ubifs_assert(len > 0 && wbuf->lnum >= 0 && wbuf->lnum < c->leb_cnt);
         ubifs_assert(wbuf->offs >= 0 && wbuf->offs % c->min_io_size == 0);
         ubifs_assert(!(wbuf->offs & 7) && wbuf->offs <= c->leb_size);
@@ -535,8 +536,8 @@ int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len)
                 memcpy(wbuf->buf + wbuf->used, buf, len);
 
                 if (aligned_len == wbuf->avail) {
-                        dbg_io("flush jhead %d wbuf to LEB %d:%d",
-                               wbuf->jhead, wbuf->lnum, wbuf->offs);
+                        dbg_io("flush jhead %s wbuf to LEB %d:%d",
+                               dbg_jhead(wbuf->jhead), wbuf->lnum, wbuf->offs);
                         err = ubi_leb_write(c->ubi, wbuf->lnum, wbuf->buf,
                                             wbuf->offs, c->min_io_size,
                                             wbuf->dtype);
@@ -564,8 +565,8 @@ int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len)
          * minimal I/O unit. We have to fill and flush write-buffer and switch
          * to the next min. I/O unit.
          */
-        dbg_io("flush jhead %d wbuf to LEB %d:%d",
-               wbuf->jhead, wbuf->lnum, wbuf->offs);
+        dbg_io("flush jhead %s wbuf to LEB %d:%d",
+               dbg_jhead(wbuf->jhead), wbuf->lnum, wbuf->offs);
         memcpy(wbuf->buf + wbuf->used, buf, wbuf->avail);
         err = ubi_leb_write(c->ubi, wbuf->lnum, wbuf->buf, wbuf->offs,
                             c->min_io_size, wbuf->dtype);
@@ -698,8 +699,8 @@ int ubifs_read_node_wbuf(struct ubifs_wbuf *wbuf, void *buf, int type, int len,
         int err, rlen, overlap;
         struct ubifs_ch *ch = buf;
 
-        dbg_io("LEB %d:%d, %s, length %d, jhead %d", lnum, offs,
-               dbg_ntype(type), len, wbuf->jhead);
+        dbg_io("LEB %d:%d, %s, length %d, jhead %s", lnum, offs,
+               dbg_ntype(type), len, dbg_jhead(wbuf->jhead));
         ubifs_assert(wbuf && lnum >= 0 && lnum < c->leb_cnt && offs >= 0);
         ubifs_assert(!(offs & 7) && offs < c->leb_size);
         ubifs_assert(type >= 0 && type < UBIFS_NODE_TYPES_CNT);
diff --git a/fs/ubifs/journal.c b/fs/ubifs/journal.c
index 64b5f3a309f5..d321baeca68d 100644
--- a/fs/ubifs/journal.c
+++ b/fs/ubifs/journal.c
@@ -158,7 +158,7 @@ again:
          * some. But the write-buffer mutex has to be unlocked because
          * GC also takes it.
          */
-        dbg_jnl("no free space  jhead %d, run GC", jhead);
+        dbg_jnl("no free space in jhead %s, run GC", dbg_jhead(jhead));
         mutex_unlock(&wbuf->io_mutex);
 
         lnum = ubifs_garbage_collect(c, 0);
@@ -173,7 +173,8 @@ again:
                  * because we dropped @wbuf->io_mutex, so try once
                  * again.
                  */
-                dbg_jnl("GC couldn't make a free LEB for jhead %d", jhead);
+                dbg_jnl("GC couldn't make a free LEB for jhead %s",
+                        dbg_jhead(jhead));
                 if (retries++ < 2) {
                         dbg_jnl("retry (%d)", retries);
                         goto again;
@@ -184,7 +185,7 @@ again:
         }
 
         mutex_lock_nested(&wbuf->io_mutex, wbuf->jhead);
-        dbg_jnl("got LEB %d for jhead %d", lnum, jhead);
+        dbg_jnl("got LEB %d for jhead %s", lnum, dbg_jhead(jhead));
         avail = c->leb_size - wbuf->offs - wbuf->used;
 
         if (wbuf->lnum != -1 && avail >= len) {
@@ -255,7 +256,8 @@ static int write_node(struct ubifs_info *c, int jhead, void *node, int len,
         *lnum = c->jheads[jhead].wbuf.lnum;
         *offs = c->jheads[jhead].wbuf.offs + c->jheads[jhead].wbuf.used;
 
-        dbg_jnl("jhead %d, LEB %d:%d, len %d", jhead, *lnum, *offs, len);
+        dbg_jnl("jhead %s, LEB %d:%d, len %d",
+                dbg_jhead(jhead), *lnum, *offs, len);
         ubifs_prepare_node(c, node, len, 0);
 
         return ubifs_wbuf_write_nolock(wbuf, node, len);
@@ -285,7 +287,8 @@ static int write_head(struct ubifs_info *c, int jhead, void *buf, int len,
 
         *lnum = c->jheads[jhead].wbuf.lnum;
         *offs = c->jheads[jhead].wbuf.offs + c->jheads[jhead].wbuf.used;
-        dbg_jnl("jhead %d, LEB %d:%d, len %d", jhead, *lnum, *offs, len);
+        dbg_jnl("jhead %s, LEB %d:%d, len %d",
+                dbg_jhead(jhead), *lnum, *offs, len);
 
         err = ubifs_wbuf_write_nolock(wbuf, buf, len);
         if (err)
diff --git a/fs/ubifs/key.h b/fs/ubifs/key.h
index 5fa27ea031ba..0f530c684f0b 100644
--- a/fs/ubifs/key.h
+++ b/fs/ubifs/key.h
@@ -229,23 +229,6 @@ static inline void xent_key_init(const struct ubifs_info *c,
 }
 
 /**
- * xent_key_init_hash - initialize extended attribute entry key without
- *                      re-calculating hash function.
- * @c: UBIFS file-system description object
- * @key: key to initialize
- * @inum: host inode number
- * @hash: extended attribute entry name hash
- */
-static inline void xent_key_init_hash(const struct ubifs_info *c,
-                                      union ubifs_key *key, ino_t inum,
-                                      uint32_t hash)
-{
-        ubifs_assert(!(hash & ~UBIFS_S_KEY_HASH_MASK));
-        key->u32[0] = inum;
-        key->u32[1] = hash | (UBIFS_XENT_KEY << UBIFS_S_KEY_HASH_BITS);
-}
-
-/**
  * xent_key_init_flash - initialize on-flash extended attribute entry key.
  * @c: UBIFS file-system description object
  * @k: key to initialize
@@ -295,22 +278,15 @@ static inline void data_key_init(const struct ubifs_info *c,
 }
 
 /**
- * data_key_init_flash - initialize on-flash data key.
+ * highest_data_key - get the highest possible data key for an inode.
  * @c: UBIFS file-system description object
- * @k: key to initialize
+ * @key: key to initialize
  * @inum: inode number
- * @block: block number
  */
-static inline void data_key_init_flash(const struct ubifs_info *c, void *k,
-                                       ino_t inum, unsigned int block)
+static inline void highest_data_key(const struct ubifs_info *c,
+                                   union ubifs_key *key, ino_t inum)
 {
-        union ubifs_key *key = k;
-
-        ubifs_assert(!(block & ~UBIFS_S_KEY_BLOCK_MASK));
-        key->j32[0] = cpu_to_le32(inum);
-        key->j32[1] = cpu_to_le32(block |
-                                  (UBIFS_DATA_KEY << UBIFS_S_KEY_BLOCK_BITS));
-        memset(k + 8, 0, UBIFS_MAX_KEY_LEN - 8);
+        data_key_init(c, key, inum, UBIFS_S_KEY_BLOCK_MASK);
 }
 
 /**
@@ -554,4 +530,5 @@ static inline unsigned long long key_max_inode_size(const struct ubifs_info *c)
                 return 0;
         }
 }
+
 #endif /* !__UBIFS_KEY_H__ */
diff --git a/fs/ubifs/log.c b/fs/ubifs/log.c
index 56e33772a1ee..c345e125f42c 100644
--- a/fs/ubifs/log.c
+++ b/fs/ubifs/log.c
@@ -169,8 +169,8 @@ void ubifs_add_bud(struct ubifs_info *c, struct ubifs_bud *bud)
          */
         c->bud_bytes += c->leb_size - bud->start;
 
-        dbg_log("LEB %d:%d, jhead %d, bud_bytes %lld", bud->lnum,
-                bud->start, bud->jhead, c->bud_bytes);
+        dbg_log("LEB %d:%d, jhead %s, bud_bytes %lld", bud->lnum,
+                bud->start, dbg_jhead(bud->jhead), c->bud_bytes);
         spin_unlock(&c->buds_lock);
 }
 
@@ -355,16 +355,16 @@ static void remove_buds(struct ubifs_info *c)
                          * heads (non-closed buds).
                          */
                         c->cmt_bud_bytes += wbuf->offs - bud->start;
-                        dbg_log("preserve %d:%d, jhead %d, bud bytes %d, "
+                        dbg_log("preserve %d:%d, jhead %s, bud bytes %d, "
                                 "cmt_bud_bytes %lld", bud->lnum, bud->start,
-                                bud->jhead, wbuf->offs - bud->start,
+                                dbg_jhead(bud->jhead), wbuf->offs - bud->start,
                                 c->cmt_bud_bytes);
                         bud->start = wbuf->offs;
                 } else {
                         c->cmt_bud_bytes += c->leb_size - bud->start;
-                        dbg_log("remove %d:%d, jhead %d, bud bytes %d, "
+                        dbg_log("remove %d:%d, jhead %s, bud bytes %d, "
                                 "cmt_bud_bytes %lld", bud->lnum, bud->start,
-                                bud->jhead, c->leb_size - bud->start,
+                                dbg_jhead(bud->jhead), c->leb_size - bud->start,
                                 c->cmt_bud_bytes);
                         rb_erase(p1, &c->buds);
                         /*
@@ -429,7 +429,8 @@ int ubifs_log_start_commit(struct ubifs_info *c, int *ltail_lnum)
                 if (lnum == -1 || offs == c->leb_size)
                         continue;
 
-                dbg_log("add ref to LEB %d:%d for jhead %d", lnum, offs, i);
+                dbg_log("add ref to LEB %d:%d for jhead %s",
+                        lnum, offs, dbg_jhead(i));
                 ref = buf + len;
                 ref->ch.node_type = UBIFS_REF_NODE;
                 ref->lnum = cpu_to_le32(lnum);
@@ -695,7 +696,7 @@ int ubifs_consolidate_log(struct ubifs_info *c)
         lnum = c->ltail_lnum;
         write_lnum = lnum;
         while (1) {
-                sleb = ubifs_scan(c, lnum, 0, c->sbuf);
+                sleb = ubifs_scan(c, lnum, 0, c->sbuf, 0);
                 if (IS_ERR(sleb)) {
                         err = PTR_ERR(sleb);
                         goto out_free;
diff --git a/fs/ubifs/lprops.c b/fs/ubifs/lprops.c
index 4cdd284dea56..4d4ca388889b 100644
--- a/fs/ubifs/lprops.c
+++ b/fs/ubifs/lprops.c
@@ -281,7 +281,7 @@ void ubifs_add_to_cat(struct ubifs_info *c, struct ubifs_lprops *lprops,
         case LPROPS_FREE:
                 if (add_to_lpt_heap(c, lprops, cat))
                         break;
-                /* No more room on heap so make it uncategorized */
+                /* No more room on heap so make it un-categorized */
                 cat = LPROPS_UNCAT;
                 /* Fall through */
         case LPROPS_UNCAT:
@@ -375,8 +375,8 @@ void ubifs_replace_cat(struct ubifs_info *c, struct ubifs_lprops *old_lprops,
  * @lprops: LEB properties
  *
  * A LEB may have fallen off of the bottom of a heap, and ended up as
- * uncategorized even though it has enough space for us now. If that is the case
- * this function will put the LEB back onto a heap.
+ * un-categorized even though it has enough space for us now. If that is the
+ * case this function will put the LEB back onto a heap.
  */
 void ubifs_ensure_cat(struct ubifs_info *c, struct ubifs_lprops *lprops)
 {
@@ -436,10 +436,10 @@ int ubifs_categorize_lprops(const struct ubifs_info *c,
 /**
  * change_category - change LEB properties category.
  * @c: UBIFS file-system description object
- * @lprops: LEB properties to recategorize
+ * @lprops: LEB properties to re-categorize
  *
  * LEB properties are categorized to enable fast find operations. When the LEB
- * properties change they must be recategorized.
+ * properties change they must be re-categorized.
  */
 static void change_category(struct ubifs_info *c, struct ubifs_lprops *lprops)
 {
@@ -461,21 +461,18 @@ static void change_category(struct ubifs_info *c, struct ubifs_lprops *lprops)
 }
 
 /**
- * calc_dark - calculate LEB dark space size.
+ * ubifs_calc_dark - calculate LEB dark space size.
  * @c: the UBIFS file-system description object
  * @spc: amount of free and dirty space in the LEB
  *
- * This function calculates amount of dark space in an LEB which has @spc bytes
- * of free and dirty space. Returns the calculations result.
+ * This function calculates and returns amount of dark space in an LEB which
+ * has @spc bytes of free and dirty space.
  *
- * Dark space is the space which is not always usable - it depends on which
- * nodes are written in which order. E.g., if an LEB has only 512 free bytes,
- * it is dark space, because it cannot fit a large data node. So UBIFS cannot
- * count on this LEB and treat these 512 bytes as usable because it is not true
- * if, for example, only big chunks of uncompressible data will be written to
- * the FS.
+ * UBIFS is trying to account the space which might not be usable, and this
+ * space is called "dark space". For example, if an LEB has only %512 free
+ * bytes, it is dark space, because it cannot fit a large data node.
  */
-static int calc_dark(struct ubifs_info *c, int spc)
+int ubifs_calc_dark(const struct ubifs_info *c, int spc)
 {
         ubifs_assert(!(spc & 7));
 
@@ -518,7 +515,7 @@ static int is_lprops_dirty(struct ubifs_info *c, struct ubifs_lprops *lprops)
  * @free: new free space amount
  * @dirty: new dirty space amount
  * @flags: new flags
- * @idx_gc_cnt: change to the count of idx_gc list
+ * @idx_gc_cnt: change to the count of @idx_gc list
  *
  * This function changes LEB properties (@free, @dirty or @flag). However, the
  * property which has the %LPROPS_NC value is not changed. Returns a pointer to
@@ -535,7 +532,7 @@ const struct ubifs_lprops *ubifs_change_lp(struct ubifs_info *c,
 {
         /*
          * This is the only function that is allowed to change lprops, so we
-         * discard the const qualifier.
+         * discard the "const" qualifier.
          */
         struct ubifs_lprops *lprops = (struct ubifs_lprops *)lp;
 
@@ -575,7 +572,7 @@ const struct ubifs_lprops *ubifs_change_lp(struct ubifs_info *c,
                 if (old_spc < c->dead_wm)
                         c->lst.total_dead -= old_spc;
                 else
-                        c->lst.total_dark -= calc_dark(c, old_spc);
+                        c->lst.total_dark -= ubifs_calc_dark(c, old_spc);
 
                 c->lst.total_used -= c->leb_size - old_spc;
         }
@@ -616,7 +613,7 @@ const struct ubifs_lprops *ubifs_change_lp(struct ubifs_info *c,
                 if (new_spc < c->dead_wm)
                         c->lst.total_dead += new_spc;
                 else
-                        c->lst.total_dark += calc_dark(c, new_spc);
+                        c->lst.total_dark += ubifs_calc_dark(c, new_spc);
 
                 c->lst.total_used += c->leb_size - new_spc;
         }
@@ -1096,7 +1093,7 @@ static int scan_check_cb(struct ubifs_info *c,
                 }
         }
 
-        sleb = ubifs_scan(c, lnum, 0, c->dbg->buf);
+        sleb = ubifs_scan(c, lnum, 0, c->dbg->buf, 0);
         if (IS_ERR(sleb)) {
                 /*
                  * After an unclean unmount, empty and freeable LEBs
@@ -1107,7 +1104,7 @@ static int scan_check_cb(struct ubifs_info *c,
                                   "- continuing checking");
                         lst->empty_lebs += 1;
                         lst->total_free += c->leb_size;
-                        lst->total_dark += calc_dark(c, c->leb_size);
+                        lst->total_dark += ubifs_calc_dark(c, c->leb_size);
                         return LPT_SCAN_CONTINUE;
                 }
 
@@ -1117,7 +1114,7 @@ static int scan_check_cb(struct ubifs_info *c,
                                   "- continuing checking");
                         lst->total_free  += lp->free;
                         lst->total_dirty += lp->dirty;
-                        lst->total_dark  +=  calc_dark(c, c->leb_size);
+                        lst->total_dark  +=  ubifs_calc_dark(c, c->leb_size);
                         return LPT_SCAN_CONTINUE;
                 }
                 data->err = PTR_ERR(sleb);
@@ -1235,7 +1232,7 @@ static int scan_check_cb(struct ubifs_info *c,
                 if (spc < c->dead_wm)
                         lst->total_dead += spc;
                 else
-                        lst->total_dark += calc_dark(c, spc);
+                        lst->total_dark += ubifs_calc_dark(c, spc);
         }
 
         ubifs_scan_destroy(sleb);
diff --git a/fs/ubifs/master.c b/fs/ubifs/master.c
index a88f33801b98..28beaeedadc0 100644
--- a/fs/ubifs/master.c
+++ b/fs/ubifs/master.c
@@ -29,7 +29,8 @@
  * @c: UBIFS file-system description object
  *
  * This function scans the master node LEBs and search for the latest master
- * node. Returns zero in case of success and a negative error code in case of
+ * node. Returns zero in case of success, %-EUCLEAN if there master area is
+ * corrupted and requires recovery, and a negative error code in case of
  * failure.
  */
 static int scan_for_master(struct ubifs_info *c)
@@ -40,7 +41,7 @@ static int scan_for_master(struct ubifs_info *c)
 
         lnum = UBIFS_MST_LNUM;
 
-        sleb = ubifs_scan(c, lnum, 0, c->sbuf);
+        sleb = ubifs_scan(c, lnum, 0, c->sbuf, 1);
         if (IS_ERR(sleb))
                 return PTR_ERR(sleb);
         nodes_cnt = sleb->nodes_cnt;
@@ -48,7 +49,7 @@ static int scan_for_master(struct ubifs_info *c)
                 snod = list_entry(sleb->nodes.prev, struct ubifs_scan_node,
                                   list);
                 if (snod->type != UBIFS_MST_NODE)
-                        goto out;
+                        goto out_dump;
                 memcpy(c->mst_node, snod->node, snod->len);
                 offs = snod->offs;
         }
@@ -56,7 +57,7 @@ static int scan_for_master(struct ubifs_info *c)
 
         lnum += 1;
 
-        sleb = ubifs_scan(c, lnum, 0, c->sbuf);
+        sleb = ubifs_scan(c, lnum, 0, c->sbuf, 1);
         if (IS_ERR(sleb))
                 return PTR_ERR(sleb);
         if (sleb->nodes_cnt != nodes_cnt)
@@ -65,7 +66,7 @@ static int scan_for_master(struct ubifs_info *c)
                 goto out;
         snod = list_entry(sleb->nodes.prev, struct ubifs_scan_node, list);
         if (snod->type != UBIFS_MST_NODE)
-                goto out;
+                goto out_dump;
         if (snod->offs != offs)
                 goto out;
         if (memcmp((void *)c->mst_node + UBIFS_CH_SZ,
@@ -78,6 +79,12 @@ static int scan_for_master(struct ubifs_info *c)
 
 out:
         ubifs_scan_destroy(sleb);
+        return -EUCLEAN;
+
+out_dump:
+        ubifs_err("unexpected node type %d master LEB %d:%d",
+                  snod->type, lnum, snod->offs);
+        ubifs_scan_destroy(sleb);
         return -EINVAL;
 }
 
@@ -256,7 +263,8 @@ int ubifs_read_master(struct ubifs_info *c)
 
         err = scan_for_master(c);
         if (err) {
-                err = ubifs_recover_master_node(c);
+                if (err == -EUCLEAN)
+                        err = ubifs_recover_master_node(c);
                 if (err)
                         /*
                          * Note, we do not free 'c->mst_node' here because the
diff --git a/fs/ubifs/orphan.c b/fs/ubifs/orphan.c
index 152a7b34a141..82009c74b6a3 100644
--- a/fs/ubifs/orphan.c
+++ b/fs/ubifs/orphan.c
@@ -670,9 +670,10 @@ static int kill_orphans(struct ubifs_info *c)
                 struct ubifs_scan_leb *sleb;
 
                 dbg_rcvry("LEB %d", lnum);
-                sleb = ubifs_scan(c, lnum, 0, c->sbuf);
+                sleb = ubifs_scan(c, lnum, 0, c->sbuf, 1);
                 if (IS_ERR(sleb)) {
-                        sleb = ubifs_recover_leb(c, lnum, 0, c->sbuf, 0);
+                        if (PTR_ERR(sleb) == -EUCLEAN)
+                                sleb = ubifs_recover_leb(c, lnum, 0, c->sbuf, 0);
                         if (IS_ERR(sleb)) {
                                 err = PTR_ERR(sleb);
                                 break;
@@ -899,7 +900,7 @@ static int dbg_scan_orphans(struct ubifs_info *c, struct check_info *ci)
         for (lnum = c->orph_first; lnum <= c->orph_last; lnum++) {
                 struct ubifs_scan_leb *sleb;
 
-                sleb = ubifs_scan(c, lnum, 0, c->dbg->buf);
+                sleb = ubifs_scan(c, lnum, 0, c->dbg->buf, 0);
                 if (IS_ERR(sleb)) {
                         err = PTR_ERR(sleb);
                         break;
diff --git a/fs/ubifs/recovery.c b/fs/ubifs/recovery.c
index e5f6cf8a1155..f94ddf7efba0 100644
--- a/fs/ubifs/recovery.c
+++ b/fs/ubifs/recovery.c
@@ -286,7 +286,7 @@ int ubifs_recover_master_node(struct ubifs_info *c)
                 mst = mst2;
         }
 
-        dbg_rcvry("recovered master node from LEB %d",
+        ubifs_msg("recovered master node from LEB %d",
                   (mst == mst1 ? UBIFS_MST_LNUM : UBIFS_MST_LNUM + 1));
 
         memcpy(c->mst_node, mst, UBIFS_MST_NODE_SZ);
@@ -790,7 +790,7 @@ struct ubifs_scan_leb *ubifs_recover_log_leb(struct ubifs_info *c, int lnum,
                  * We can only recover at the end of the log, so check that the
                  * next log LEB is empty or out of date.
                  */
-                sleb = ubifs_scan(c, next_lnum, 0, sbuf);
+                sleb = ubifs_scan(c, next_lnum, 0, sbuf, 0);
                 if (IS_ERR(sleb))
                         return sleb;
                 if (sleb->nodes_cnt) {
diff --git a/fs/ubifs/replay.c b/fs/ubifs/replay.c
index 2970500f32df..5c2d6d759a3e 100644
--- a/fs/ubifs/replay.c
+++ b/fs/ubifs/replay.c
@@ -506,7 +506,7 @@ static int replay_bud(struct ubifs_info *c, int lnum, int offs, int jhead,
         if (c->need_recovery)
                 sleb = ubifs_recover_leb(c, lnum, offs, c->sbuf, jhead != GCHD);
         else
-                sleb = ubifs_scan(c, lnum, offs, c->sbuf);
+                sleb = ubifs_scan(c, lnum, offs, c->sbuf, 0);
         if (IS_ERR(sleb))
                 return PTR_ERR(sleb);
 
@@ -836,8 +836,8 @@ static int replay_log_leb(struct ubifs_info *c, int lnum, int offs, void *sbuf)
         const struct ubifs_cs_node *node;
 
         dbg_mnt("replay log LEB %d:%d", lnum, offs);
-        sleb = ubifs_scan(c, lnum, offs, sbuf);
-        if (IS_ERR(sleb) ) {
+        sleb = ubifs_scan(c, lnum, offs, sbuf, c->need_recovery);
+        if (IS_ERR(sleb)) {
                 if (PTR_ERR(sleb) != -EUCLEAN || !c->need_recovery)
                         return PTR_ERR(sleb);
                 sleb = ubifs_recover_log_leb(c, lnum, offs, sbuf);
diff --git a/fs/ubifs/scan.c b/fs/ubifs/scan.c
index 892ebfee4fe5..96c525384191 100644
--- a/fs/ubifs/scan.c
+++ b/fs/ubifs/scan.c
@@ -108,10 +108,9 @@ int ubifs_scan_a_node(const struct ubifs_info *c, void *buf, int len, int lnum,
 
                 /* Make the node pads to 8-byte boundary */
                 if ((node_len + pad_len) & 7) {
-                        if (!quiet) {
+                        if (!quiet)
                                 dbg_err("bad padding length %d - %d",
                                         offs, offs + node_len + pad_len);
-                        }
                         return SCANNED_A_BAD_PAD_NODE;
                 }
 
@@ -253,15 +252,19 @@ void ubifs_scanned_corruption(const struct ubifs_info *c, int lnum, int offs,
  * @c: UBIFS file-system description object
  * @lnum: logical eraseblock number
  * @offs: offset to start at (usually zero)
- * @sbuf: scan buffer (must be c->leb_size)
+ * @sbuf: scan buffer (must be of @c->leb_size bytes in size)
+ * @quiet: print no messages
  *
  * This function scans LEB number @lnum and returns complete information about
  * its contents. Returns the scaned information in case of success and,
  * %-EUCLEAN if the LEB neads recovery, and other negative error codes in case
  * of failure.
+ *
+ * If @quiet is non-zero, this function does not print large and scary
+ * error messages and flash dumps in case of errors.
  */
 struct ubifs_scan_leb *ubifs_scan(const struct ubifs_info *c, int lnum,
-                                  int offs, void *sbuf)
+                                  int offs, void *sbuf, int quiet)
 {
         void *buf = sbuf + offs;
         int err, len = c->leb_size - offs;
@@ -280,7 +283,7 @@ struct ubifs_scan_leb *ubifs_scan(const struct ubifs_info *c, int lnum,
 
                 cond_resched();
 
-                ret = ubifs_scan_a_node(c, buf, len, lnum, offs, 0);
+                ret = ubifs_scan_a_node(c, buf, len, lnum, offs, quiet);
                 if (ret > 0) {
                         /* Padding bytes or a valid padding node */
                         offs += ret;
@@ -320,7 +323,9 @@ struct ubifs_scan_leb *ubifs_scan(const struct ubifs_info *c, int lnum,
         }
 
         if (offs % c->min_io_size) {
-                ubifs_err("empty space starts at non-aligned offset %d", offs);
+                if (!quiet)
+                        ubifs_err("empty space starts at non-aligned offset %d",
+                                  offs);
                 goto corrupted;;
         }
 
@@ -331,18 +336,25 @@ struct ubifs_scan_leb *ubifs_scan(const struct ubifs_info *c, int lnum,
                         break;
         for (; len; offs++, buf++, len--)
                 if (*(uint8_t *)buf != 0xff) {
-                        ubifs_err("corrupt empty space at LEB %d:%d",
-                                  lnum, offs);
+                        if (!quiet)
+                                ubifs_err("corrupt empty space at LEB %d:%d",
+                                          lnum, offs);
                         goto corrupted;
                 }
 
         return sleb;
 
 corrupted:
-        ubifs_scanned_corruption(c, lnum, offs, buf);
+        if (!quiet) {
+                ubifs_scanned_corruption(c, lnum, offs, buf);
+                ubifs_err("LEB %d scanning failed", lnum);
+        }
         err = -EUCLEAN;
+        ubifs_scan_destroy(sleb);
+        return ERR_PTR(err);
+
 error:
-        ubifs_err("LEB %d scanning failed", lnum);
+        ubifs_err("LEB %d scanning failed, error %d", lnum, err);
         ubifs_scan_destroy(sleb);
         return ERR_PTR(err);
 }
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index c4af069df1ad..333e181ee987 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -36,7 +36,6 @@
 #include <linux/mount.h>
 #include <linux/math64.h>
 #include <linux/writeback.h>
-#include <linux/smp_lock.h>
 #include "ubifs.h"
 
 /*
@@ -318,6 +317,8 @@ static int ubifs_write_inode(struct inode *inode, int wait)
                 if (err)
                         ubifs_err("can't write inode %lu, error %d",
                                   inode->i_ino, err);
+                else
+                        err = dbg_check_inode_size(c, inode, ui->ui_size);
         }
 
         ui->dirty = 0;
@@ -448,17 +449,6 @@ static int ubifs_sync_fs(struct super_block *sb, int wait)
                 return 0;
 
         /*
-         * VFS calls '->sync_fs()' before synchronizing all dirty inodes and
-         * pages, so synchronize them first, then commit the journal. Strictly
-         * speaking, it is not necessary to commit the journal here,
-         * synchronizing write-buffers would be enough. But committing makes
-         * UBIFS free space predictions much more accurate, so we want to let
-         * the user be able to get more accurate results of 'statfs()' after
-         * they synchronize the file system.
-         */
-        sync_inodes_sb(sb);
-
-        /*
          * Synchronize write buffers, because 'ubifs_run_commit()' does not
          * do this if it waits for an already running commit.
          */
@@ -468,6 +458,13 @@ static int ubifs_sync_fs(struct super_block *sb, int wait)
                         return err;
         }
 
+        /*
+         * Strictly speaking, it is not necessary to commit the journal here,
+         * synchronizing write-buffers would be enough. But committing makes
+         * UBIFS free space predictions much more accurate, so we want to let
+         * the user be able to get more accurate results of 'statfs()' after
+         * they synchronize the file system.
+         */
         err = ubifs_run_commit(c);
         if (err)
                 return err;
@@ -1720,8 +1717,6 @@ static void ubifs_put_super(struct super_block *sb)
         ubifs_msg("un-mount UBI device %d, volume %d", c->vi.ubi_num,
                   c->vi.vol_id);
 
-        lock_kernel();
-
         /*
          * The following asserts are only valid if there has not been a failure
          * of the media. For example, there will be dirty inodes if we failed
@@ -1786,8 +1781,6 @@ static void ubifs_put_super(struct super_block *sb)
         ubi_close_volume(c->ubi);
         mutex_unlock(&c->umount_mutex);
         kfree(c);
-
-        unlock_kernel();
 }
 
 static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
@@ -1803,22 +1796,17 @@ static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
                 return err;
         }
 
-        lock_kernel();
         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
                 if (c->ro_media) {
                         ubifs_msg("cannot re-mount due to prior errors");
-                        unlock_kernel();
                         return -EROFS;
                 }
                 err = ubifs_remount_rw(c);
-                if (err) {
-                        unlock_kernel();
+                if (err)
                         return err;
-                }
         } else if (!(sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY)) {
                 if (c->ro_media) {
                         ubifs_msg("cannot re-mount due to prior errors");
-                        unlock_kernel();
                         return -EROFS;
                 }
                 ubifs_remount_ro(c);
@@ -1833,7 +1821,6 @@ static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
         }
 
         ubifs_assert(c->lst.taken_empty_lebs > 0);
-        unlock_kernel();
         return 0;
 }
 
diff --git a/fs/ubifs/tnc.c b/fs/ubifs/tnc.c
index f249f7b0d656..e5b1a7d00fa0 100644
--- a/fs/ubifs/tnc.c
+++ b/fs/ubifs/tnc.c
@@ -1159,8 +1159,8 @@ static struct ubifs_znode *dirty_cow_bottom_up(struct ubifs_info *c,
  *   o exact match, i.e. the found zero-level znode contains key @key, then %1
  *     is returned and slot number of the matched branch is stored in @n;
  *   o not exact match, which means that zero-level znode does not contain
- *     @key, then %0 is returned and slot number of the closed branch is stored
- *     in  @n;
+ *     @key, then %0 is returned and slot number of the closest branch is stored
+ *     in @n;
  *   o @key is so small that it is even less than the lowest key of the
  *     leftmost zero-level node, then %0 is returned and %0 is stored in @n.
  *
@@ -1433,7 +1433,7 @@ static int maybe_leb_gced(struct ubifs_info *c, int lnum, int gc_seq1)
  * @lnum: LEB number is returned here
  * @offs: offset is returned here
  *
- * This function look up and reads node with key @key. The caller has to make
+ * This function looks up and reads node with key @key. The caller has to make
  * sure the @node buffer is large enough to fit the node. Returns zero in case
  * of success, %-ENOENT if the node was not found, and a negative error code in
  * case of failure. The node location can be returned in @lnum and @offs.
@@ -3268,3 +3268,73 @@ out_unlock:
         mutex_unlock(&c->tnc_mutex);
         return err;
 }
+
+#ifdef CONFIG_UBIFS_FS_DEBUG
+
+/**
+ * dbg_check_inode_size - check if inode size is correct.
+ * @c: UBIFS file-system description object
+ * @inum: inode number
+ * @size: inode size
+ *
+ * This function makes sure that the inode size (@size) is correct and it does
+ * not have any pages beyond @size. Returns zero if the inode is OK, %-EINVAL
+ * if it has a data page beyond @size, and other negative error code in case of
+ * other errors.
+ */
+int dbg_check_inode_size(struct ubifs_info *c, const struct inode *inode,
+                         loff_t size)
+{
+        int err, n;
+        union ubifs_key from_key, to_key, *key;
+        struct ubifs_znode *znode;
+        unsigned int block;
+
+        if (!S_ISREG(inode->i_mode))
+                return 0;
+        if (!(ubifs_chk_flags & UBIFS_CHK_GEN))
+                return 0;
+
+        block = (size + UBIFS_BLOCK_SIZE - 1) >> UBIFS_BLOCK_SHIFT;
+        data_key_init(c, &from_key, inode->i_ino, block);
+        highest_data_key(c, &to_key, inode->i_ino);
+
+        mutex_lock(&c->tnc_mutex);
+        err = ubifs_lookup_level0(c, &from_key, &znode, &n);
+        if (err < 0)
+                goto out_unlock;
+
+        if (err) {
+                err = -EINVAL;
+                key = &from_key;
+                goto out_dump;
+        }
+
+        err = tnc_next(c, &znode, &n);
+        if (err == -ENOENT) {
+                err = 0;
+                goto out_unlock;
+        }
+        if (err < 0)
+                goto out_unlock;
+
+        ubifs_assert(err == 0);
+        key = &znode->zbranch[n].key;
+        if (!key_in_range(c, key, &from_key, &to_key))
+                goto out_unlock;
+
+out_dump:
+        block = key_block(c, key);
+        ubifs_err("inode %lu has size %lld, but there are data at offset %lld "
+                  "(data key %s)", (unsigned long)inode->i_ino, size,
+                  ((loff_t)block) << UBIFS_BLOCK_SHIFT, DBGKEY(key));
+        dbg_dump_inode(c, inode);
+        dbg_dump_stack();
+        err = -EINVAL;
+
+out_unlock:
+        mutex_unlock(&c->tnc_mutex);
+        return err;
+}
+
+#endif /* CONFIG_UBIFS_FS_DEBUG */
diff --git a/fs/ubifs/tnc_commit.c b/fs/ubifs/tnc_commit.c
index fde8d127c768..53288e5d604e 100644
--- a/fs/ubifs/tnc_commit.c
+++ b/fs/ubifs/tnc_commit.c
@@ -245,7 +245,7 @@ static int layout_leb_in_gaps(struct ubifs_info *c, int *p)
          * it is more comprehensive and less efficient than is needed for this
          * purpose.
          */
-        sleb = ubifs_scan(c, lnum, 0, c->ileb_buf);
+        sleb = ubifs_scan(c, lnum, 0, c->ileb_buf, 0);
         c->ileb_len = 0;
         if (IS_ERR(sleb))
                 return PTR_ERR(sleb);
diff --git a/fs/ubifs/ubifs-media.h b/fs/ubifs/ubifs-media.h
index 3eee07e0c495..191ca7863fe7 100644
--- a/fs/ubifs/ubifs-media.h
+++ b/fs/ubifs/ubifs-media.h
@@ -135,6 +135,13 @@
 /* The key is always at the same position in all keyed nodes */
 #define UBIFS_KEY_OFFSET offsetof(struct ubifs_ino_node, key)
 
+/* Garbage collector journal head number */
+#define UBIFS_GC_HEAD   0
+/* Base journal head number */
+#define UBIFS_BASE_HEAD 1
+/* Data journal head number */
+#define UBIFS_DATA_HEAD 2
+
 /*
  * LEB Properties Tree node types.
  *
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index a29349094422..b2d976366a46 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -105,12 +105,10 @@
 /* Number of non-data journal heads */
 #define NONDATA_JHEADS_CNT 2
 
-/* Garbage collector head */
-#define GCHD   0
-/* Base journal head number */
-#define BASEHD 1
-/* First "general purpose" journal head */
-#define DATAHD 2
+/* Shorter names for journal head numbers for internal usage */
+#define GCHD   UBIFS_GC_HEAD
+#define BASEHD UBIFS_BASE_HEAD
+#define DATAHD UBIFS_DATA_HEAD
 
 /* 'No change' value for 'ubifs_change_lp()' */
 #define LPROPS_NC 0x80000001
@@ -1451,7 +1449,7 @@ int ubifs_sync_wbufs_by_inode(struct ubifs_info *c, struct inode *inode);
 
 /* scan.c */
 struct ubifs_scan_leb *ubifs_scan(const struct ubifs_info *c, int lnum,
-                                  int offs, void *sbuf);
+                                  int offs, void *sbuf, int quiet);
 void ubifs_scan_destroy(struct ubifs_scan_leb *sleb);
 int ubifs_scan_a_node(const struct ubifs_info *c, void *buf, int len, int lnum,
                       int offs, int quiet);
@@ -1676,6 +1674,7 @@ const struct ubifs_lprops *ubifs_fast_find_free(struct ubifs_info *c);
 const struct ubifs_lprops *ubifs_fast_find_empty(struct ubifs_info *c);
 const struct ubifs_lprops *ubifs_fast_find_freeable(struct ubifs_info *c);
 const struct ubifs_lprops *ubifs_fast_find_frdi_idx(struct ubifs_info *c);
+int ubifs_calc_dark(const struct ubifs_info *c, int spc);
 
 /* file.c */
 int ubifs_fsync(struct file *file, struct dentry *dentry, int datasync);
diff --git a/fs/ubifs/xattr.c b/fs/ubifs/xattr.c
index adafcf556531..195830f47569 100644
--- a/fs/ubifs/xattr.c
+++ b/fs/ubifs/xattr.c
@@ -78,9 +78,9 @@ enum {
         SECURITY_XATTR,
 };
 
-static struct inode_operations none_inode_operations;
-static struct address_space_operations none_address_operations;
-static struct file_operations none_file_operations;
+static const struct inode_operations none_inode_operations;
+static const struct address_space_operations none_address_operations;
+static const struct file_operations none_file_operations;
 
 /**
  * create_xattr - create an extended attribute.
diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index d5e5559e31db..381854461b28 100644
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -1635,4 +1635,5 @@ const struct address_space_operations xfs_address_space_operations = {
         .direct_IO              = xfs_vm_direct_IO,
         .migratepage            = buffer_migrate_page,
         .is_partially_uptodate  = block_is_partially_uptodate,
+        .error_remove_page      = generic_error_remove_page,
 };
diff --git a/fs/xfs/linux-2.6/xfs_file.c b/fs/xfs/linux-2.6/xfs_file.c
index 988d8f87bc0f..629370974e57 100644
--- a/fs/xfs/linux-2.6/xfs_file.c
+++ b/fs/xfs/linux-2.6/xfs_file.c
@@ -42,7 +42,7 @@
 
 #include <linux/dcache.h>
 
-static struct vm_operations_struct xfs_file_vm_ops;
+static const struct vm_operations_struct xfs_file_vm_ops;
 
 STATIC ssize_t
 xfs_file_aio_read(
@@ -280,7 +280,7 @@ const struct file_operations xfs_dir_file_operations = {
         .fsync          = xfs_file_fsync,
 };
 
-static struct vm_operations_struct xfs_file_vm_ops = {
+static const struct vm_operations_struct xfs_file_vm_ops = {
         .fault          = filemap_fault,
         .page_mkwrite   = xfs_vm_page_mkwrite,
 };
diff --git a/fs/xfs/linux-2.6/xfs_quotaops.c b/fs/xfs/linux-2.6/xfs_quotaops.c
index cb6e2cca214f..9e41f91aa269 100644
--- a/fs/xfs/linux-2.6/xfs_quotaops.c
+++ b/fs/xfs/linux-2.6/xfs_quotaops.c
@@ -150,7 +150,7 @@ xfs_fs_set_xquota(
         return -xfs_qm_scall_setqlim(mp, id, xfs_quota_type(type), fdq);
 }
 
-struct quotactl_ops xfs_quotactl_operations = {
+const struct quotactl_ops xfs_quotactl_operations = {
         .quota_sync             = xfs_fs_quota_sync,
         .get_xstate             = xfs_fs_get_xstate,
         .set_xstate             = xfs_fs_set_xstate,
diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index 5d7c60ac77b4..bdd41c8c342f 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/fs/xfs/linux-2.6/xfs_super.c
@@ -67,7 +67,7 @@
 #include <linux/freezer.h>
 #include <linux/parser.h>
 
-static struct super_operations xfs_super_operations;
+static const struct super_operations xfs_super_operations;
 static kmem_zone_t *xfs_ioend_zone;
 mempool_t *xfs_ioend_pool;
 
@@ -1536,7 +1536,7 @@ xfs_fs_get_sb(
                            mnt);
 }
 
-static struct super_operations xfs_super_operations = {
+static const struct super_operations xfs_super_operations = {
         .alloc_inode            = xfs_fs_alloc_inode,
         .destroy_inode          = xfs_fs_destroy_inode,
         .write_inode            = xfs_fs_write_inode,
diff --git a/fs/xfs/linux-2.6/xfs_super.h b/fs/xfs/linux-2.6/xfs_super.h
index 5a2ea3a21781..18175ebd58ed 100644
--- a/fs/xfs/linux-2.6/xfs_super.h
+++ b/fs/xfs/linux-2.6/xfs_super.h
@@ -93,7 +93,7 @@ extern void xfs_blkdev_issue_flush(struct xfs_buftarg *);
 
 extern const struct export_operations xfs_export_operations;
 extern struct xattr_handler *xfs_xattr_handlers[];
-extern struct quotactl_ops xfs_quotactl_operations;
+extern const struct quotactl_ops xfs_quotactl_operations;
 
 #define XFS_M(sb)               ((struct xfs_mount *)((sb)->s_fs_info))
 
diff --git a/fs/xfs/linux-2.6/xfs_sysctl.c b/fs/xfs/linux-2.6/xfs_sysctl.c
index 916c0ffb6083..c5bc67c4e3bb 100644
--- a/fs/xfs/linux-2.6/xfs_sysctl.c
+++ b/fs/xfs/linux-2.6/xfs_sysctl.c
@@ -26,7 +26,6 @@ STATIC int
 xfs_stats_clear_proc_handler(
         ctl_table       *ctl,
         int             write,
-        struct file     *filp,
         void            __user *buffer,
         size_t          *lenp,
         loff_t          *ppos)
@@ -34,7 +33,7 @@ xfs_stats_clear_proc_handler(
         int             c, ret, *valp = ctl->data;
         __uint32_t      vn_active;
 
-        ret = proc_dointvec_minmax(ctl, write, filp, buffer, lenp, ppos);
+        ret = proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
 
         if (!ret && write && *valp) {
                 printk("XFS Clearing xfsstats\n");
diff --git a/fs/xfs/xfs_fs.h b/fs/xfs/xfs_fs.h
index c4ea51b55dce..f52ac276277e 100644
--- a/fs/xfs/xfs_fs.h
+++ b/fs/xfs/xfs_fs.h
@@ -117,7 +117,7 @@ struct getbmapx {
 #define BMV_IF_VALID    \
         (BMV_IF_ATTRFORK|BMV_IF_NO_DMAPI_READ|BMV_IF_PREALLOC|BMV_IF_DELALLOC)
 
-/*      bmv_oflags values - returned for for each non-header segment */
+/*      bmv_oflags values - returned for each non-header segment */
 #define BMV_OF_PREALLOC         0x1     /* segment = unwritten pre-allocation */
 #define BMV_OF_DELALLOC         0x2     /* segment = delayed allocation */
 #define BMV_OF_LAST             0x4     /* segment is the last in the file */