Merge commit 'v2.6.34-rc6' into perf/core

Merge reason: update to the latest -rc.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

45 files changed, 370 insertions, 144 deletions

diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index 5c5bc8480070..f8b86e92cd66 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -238,6 +238,13 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
                 return ERR_PTR(-ENOMEM);
         }
 
+        rc = bdi_setup_and_register(&v9ses->bdi, "9p", BDI_CAP_MAP_COPY);
+        if (rc) {
+                __putname(v9ses->aname);
+                __putname(v9ses->uname);
+                return ERR_PTR(rc);
+        }
+
         spin_lock(&v9fs_sessionlist_lock);
         list_add(&v9ses->slist, &v9fs_sessionlist);
         spin_unlock(&v9fs_sessionlist_lock);
@@ -301,6 +308,7 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
         return fid;
 
 error:
+        bdi_destroy(&v9ses->bdi);
         return ERR_PTR(retval);
 }
 
@@ -326,6 +334,8 @@ void v9fs_session_close(struct v9fs_session_info *v9ses)
         __putname(v9ses->uname);
         __putname(v9ses->aname);
 
+        bdi_destroy(&v9ses->bdi);
+
         spin_lock(&v9fs_sessionlist_lock);
         list_del(&v9ses->slist);
         spin_unlock(&v9fs_sessionlist_lock);
diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
index a0a8d3dd1361..bec4d0bcb458 100644
--- a/fs/9p/v9fs.h
+++ b/fs/9p/v9fs.h
@@ -20,6 +20,7 @@
  *  Boston, MA  02111-1301  USA
  *
  */
+#include <linux/backing-dev.h>
 
 /**
  * enum p9_session_flags - option flags for each 9P session
@@ -102,6 +103,7 @@ struct v9fs_session_info {
         u32 uid;                /* if ACCESS_SINGLE, the uid that has access */
         struct p9_client *clnt; /* 9p client */
         struct list_head slist; /* list of sessions registered with v9fs */
+        struct backing_dev_info bdi;
 };
 
 struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *,
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index 491108bd6e0d..806da5d3b3a0 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -77,6 +77,7 @@ v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
         sb->s_blocksize = 1 << sb->s_blocksize_bits;
         sb->s_magic = V9FS_MAGIC;
         sb->s_op = &v9fs_super_ops;
+        sb->s_bdi = &v9ses->bdi;
 
         sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC |
             MS_NOATIME;
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index c54dad4e6063..a10f2582844f 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -19,6 +19,7 @@
 #include <linux/workqueue.h>
 #include <linux/sched.h>
 #include <linux/fscache.h>
+#include <linux/backing-dev.h>
 
 #include "afs.h"
 #include "afs_vl.h"
@@ -313,6 +314,7 @@ struct afs_volume {
         unsigned short          rjservers;      /* number of servers discarded due to -ENOMEDIUM */
         struct afs_server       *servers[8];    /* servers on which volume resides (ordered) */
         struct rw_semaphore     server_sem;     /* lock for accessing current server */
+        struct backing_dev_info bdi;
 };
 
 /*
diff --git a/fs/afs/super.c b/fs/afs/super.c
index 14f6431598ad..e932e5a3a0c1 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -311,6 +311,7 @@ static int afs_fill_super(struct super_block *sb, void *data)
         sb->s_magic             = AFS_FS_MAGIC;
         sb->s_op                = &afs_super_ops;
         sb->s_fs_info           = as;
+        sb->s_bdi               = &as->volume->bdi;
 
         /* allocate the root inode and dentry */
         fid.vid         = as->volume->vid;
diff --git a/fs/afs/volume.c b/fs/afs/volume.c
index a353e69e2391..401eeb21869f 100644
--- a/fs/afs/volume.c
+++ b/fs/afs/volume.c
@@ -106,6 +106,10 @@ struct afs_volume *afs_volume_lookup(struct afs_mount_params *params)
         volume->cell            = params->cell;
         volume->vid             = vlocation->vldb.vid[params->type];
 
+        ret = bdi_setup_and_register(&volume->bdi, "afs", BDI_CAP_MAP_COPY);
+        if (ret)
+                goto error_bdi;
+
         init_rwsem(&volume->server_sem);
 
         /* look up all the applicable server records */
@@ -151,6 +155,8 @@ error:
         return ERR_PTR(ret);
 
 error_discard:
+        bdi_destroy(&volume->bdi);
+error_bdi:
         up_write(&params->cell->vl_sem);
 
         for (loop = volume->nservers - 1; loop >= 0; loop--)
@@ -200,6 +206,7 @@ void afs_put_volume(struct afs_volume *volume)
         for (loop = volume->nservers - 1; loop >= 0; loop--)
                 afs_put_server(volume->servers[loop]);
 
+        bdi_destroy(&volume->bdi);
         kfree(volume);
 
         _leave(" [destroyed]");
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index 7ab23e006e4c..2c5f9a0e5d72 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -1005,15 +1005,8 @@ static int elf_fdpic_map_file_constdisp_on_uclinux(
                                 }
                         } else if (!mm->start_data) {
                                 mm->start_data = seg->addr;
-#ifndef CONFIG_MMU
                                 mm->end_data = seg->addr + phdr->p_memsz;
-#endif
                         }
-
-#ifdef CONFIG_MMU
-                        if (seg->addr + phdr->p_memsz > mm->end_data)
-                                mm->end_data = seg->addr + phdr->p_memsz;
-#endif
                 }
 
                 seg++;
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 2a6d0193f139..6dcee88c2e5d 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -406,16 +406,23 @@ static loff_t block_llseek(struct file *file, loff_t offset, int origin)
  
 int blkdev_fsync(struct file *filp, struct dentry *dentry, int datasync)
 {
-        struct block_device *bdev = I_BDEV(filp->f_mapping->host);
+        struct inode *bd_inode = filp->f_mapping->host;
+        struct block_device *bdev = I_BDEV(bd_inode);
         int error;
 
-        error = sync_blockdev(bdev);
-        if (error)
-                return error;
-        
+        /*
+         * There is no need to serialise calls to blkdev_issue_flush with
+         * i_mutex and doing so causes performance issues with concurrent
+         * O_SYNC writers to a block device.
+         */
+        mutex_unlock(&bd_inode->i_mutex);
+
         error = blkdev_issue_flush(bdev, NULL);
         if (error == -EOPNOTSUPP)
                 error = 0;
+
+        mutex_lock(&bd_inode->i_mutex);
+
         return error;
 }
 EXPORT_SYMBOL(blkdev_fsync);
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index e7b8f2c89ccb..feca04197d02 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -44,8 +44,6 @@ 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);
-
 /*
  * end_io_wq structs are used to do processing in task context when an IO is
  * complete.  This is used during reads to verify checksums, and it is used
@@ -1375,19 +1373,11 @@ static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
 {
         int err;
 
-        bdi->name = "btrfs";
         bdi->capabilities = BDI_CAP_MAP_COPY;
-        err = bdi_init(bdi);
+        err = bdi_setup_and_register(bdi, "btrfs", BDI_CAP_MAP_COPY);
         if (err)
                 return err;
 
-        err = bdi_register(bdi, NULL, "btrfs-%d",
-                                atomic_inc_return(&btrfs_bdi_num));
-        if (err) {
-                bdi_destroy(bdi);
-                return err;
-        }
-
         bdi->ra_pages   = default_backing_dev_info.ra_pages;
         bdi->unplug_io_fn       = btrfs_unplug_io_fn;
         bdi->unplug_io_data     = info;
diff --git a/fs/cifs/cifs_fs_sb.h b/fs/cifs/cifs_fs_sb.h
index 4797787c6a44..246a167cb913 100644
--- a/fs/cifs/cifs_fs_sb.h
+++ b/fs/cifs/cifs_fs_sb.h
@@ -18,6 +18,8 @@
 #ifndef _CIFS_FS_SB_H
 #define _CIFS_FS_SB_H
 
+#include <linux/backing-dev.h>
+
 #define CIFS_MOUNT_NO_PERM      1 /* do not do client vfs_perm check */
 #define CIFS_MOUNT_SET_UID      2 /* set current's euid in create etc. */
 #define CIFS_MOUNT_SERVER_INUM  4 /* inode numbers from uniqueid from server  */
@@ -50,5 +52,6 @@ struct cifs_sb_info {
 #ifdef CONFIG_CIFS_DFS_UPCALL
         char   *mountdata; /* mount options received at mount time */
 #endif
+        struct backing_dev_info bdi;
 };
 #endif                          /* _CIFS_FS_SB_H */
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index ded66be6597c..ad235d604a0b 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -103,6 +103,12 @@ cifs_read_super(struct super_block *sb, void *data,
         if (cifs_sb == NULL)
                 return -ENOMEM;
 
+        rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
+        if (rc) {
+                kfree(cifs_sb);
+                return rc;
+        }
+
 #ifdef CONFIG_CIFS_DFS_UPCALL
         /* copy mount params to sb for use in submounts */
         /* BB: should we move this after the mount so we
@@ -115,6 +121,7 @@ cifs_read_super(struct super_block *sb, void *data,
                 int len = strlen(data);
                 cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
                 if (cifs_sb->mountdata == NULL) {
+                        bdi_destroy(&cifs_sb->bdi);
                         kfree(sb->s_fs_info);
                         sb->s_fs_info = NULL;
                         return -ENOMEM;
@@ -135,6 +142,7 @@ cifs_read_super(struct super_block *sb, void *data,
 
         sb->s_magic = CIFS_MAGIC_NUMBER;
         sb->s_op = &cifs_super_ops;
+        sb->s_bdi = &cifs_sb->bdi;
 /*      if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
             sb->s_blocksize =
                 cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
@@ -183,6 +191,7 @@ out_mount_failed:
                 }
 #endif
                 unload_nls(cifs_sb->local_nls);
+                bdi_destroy(&cifs_sb->bdi);
                 kfree(cifs_sb);
         }
         return rc;
@@ -214,6 +223,7 @@ cifs_put_super(struct super_block *sb)
 #endif
 
         unload_nls(cifs_sb->local_nls);
+        bdi_destroy(&cifs_sb->bdi);
         kfree(cifs_sb);
 
         unlock_kernel();
diff --git a/fs/coda/inode.c b/fs/coda/inode.c
index a1695dcadd99..d97f9935a028 100644
--- a/fs/coda/inode.c
+++ b/fs/coda/inode.c
@@ -167,6 +167,10 @@ static int coda_fill_super(struct super_block *sb, void *data, int silent)
                 return -EBUSY;
         }
 
+        error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
+        if (error)
+                goto bdi_err;
+
         vc->vc_sb = sb;
 
         sb->s_fs_info = vc;
@@ -175,6 +179,7 @@ static int coda_fill_super(struct super_block *sb, void *data, int silent)
         sb->s_blocksize_bits = 12;
         sb->s_magic = CODA_SUPER_MAGIC;
         sb->s_op = &coda_super_operations;
+        sb->s_bdi = &vc->bdi;
 
         /* get root fid from Venus: this needs the root inode */
         error = venus_rootfid(sb, &fid);
@@ -200,6 +205,8 @@ static int coda_fill_super(struct super_block *sb, void *data, int silent)
         return 0;
 
  error:
+        bdi_destroy(&vc->bdi);
+ bdi_err:
         if (root)
                 iput(root);
         if (vc)
@@ -210,6 +217,7 @@ static int coda_fill_super(struct super_block *sb, void *data, int silent)
 
 static void coda_put_super(struct super_block *sb)
 {
+        bdi_destroy(&coda_vcp(sb)->bdi);
         coda_vcp(sb)->vc_sb = NULL;
         sb->s_fs_info = NULL;
 
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index c32a1b6a856b..641640dc7ae5 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -102,7 +102,6 @@
 #include <linux/nbd.h>
 #include <linux/random.h>
 #include <linux/filter.h>
-#include <linux/pktcdvd.h>
 
 #include <linux/hiddev.h>
 
@@ -1126,8 +1125,6 @@ COMPATIBLE_IOCTL(PPGETMODE)
 COMPATIBLE_IOCTL(PPGETPHASE)
 COMPATIBLE_IOCTL(PPGETFLAGS)
 COMPATIBLE_IOCTL(PPSETFLAGS)
-/* pktcdvd */
-COMPATIBLE_IOCTL(PACKET_CTRL_CMD)
 /* Big A */
 /* sparc only */
 /* Big Q for sound/OSS */
diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index bc7115403f38..bfc2e0f78f00 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -35,6 +35,7 @@
 #include <linux/scatterlist.h>
 #include <linux/hash.h>
 #include <linux/nsproxy.h>
+#include <linux/backing-dev.h>
 
 /* Version verification for shared data structures w/ userspace */
 #define ECRYPTFS_VERSION_MAJOR 0x00
@@ -393,6 +394,7 @@ struct ecryptfs_mount_crypt_stat {
 struct ecryptfs_sb_info {
         struct super_block *wsi_sb;
         struct ecryptfs_mount_crypt_stat mount_crypt_stat;
+        struct backing_dev_info bdi;
 };
 
 /* file private data. */
diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index af1a8f01ebac..760983d0f25e 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -497,17 +497,25 @@ struct kmem_cache *ecryptfs_sb_info_cache;
 static int
 ecryptfs_fill_super(struct super_block *sb, void *raw_data, int silent)
 {
+        struct ecryptfs_sb_info *esi;
         int rc = 0;
 
         /* Released in ecryptfs_put_super() */
         ecryptfs_set_superblock_private(sb,
                                         kmem_cache_zalloc(ecryptfs_sb_info_cache,
                                                          GFP_KERNEL));
-        if (!ecryptfs_superblock_to_private(sb)) {
+        esi = ecryptfs_superblock_to_private(sb);
+        if (!esi) {
                 ecryptfs_printk(KERN_WARNING, "Out of memory\n");
                 rc = -ENOMEM;
                 goto out;
         }
+
+        rc = bdi_setup_and_register(&esi->bdi, "ecryptfs", BDI_CAP_MAP_COPY);
+        if (rc)
+                goto out;
+
+        sb->s_bdi = &esi->bdi;
         sb->s_op = &ecryptfs_sops;
         /* Released through deactivate_super(sb) from get_sb_nodev */
         sb->s_root = d_alloc(NULL, &(const struct qstr) {
diff --git a/fs/ecryptfs/super.c b/fs/ecryptfs/super.c
index 278743c7716a..0c0ae491d231 100644
--- a/fs/ecryptfs/super.c
+++ b/fs/ecryptfs/super.c
@@ -122,6 +122,7 @@ static void ecryptfs_put_super(struct super_block *sb)
         lock_kernel();
 
         ecryptfs_destroy_mount_crypt_stat(&sb_info->mount_crypt_stat);
+        bdi_destroy(&sb_info->bdi);
         kmem_cache_free(ecryptfs_sb_info_cache, sb_info);
         ecryptfs_set_superblock_private(sb, NULL);
 
diff --git a/fs/exofs/exofs.h b/fs/exofs/exofs.h
index 8442e353309f..22721b2fd890 100644
--- a/fs/exofs/exofs.h
+++ b/fs/exofs/exofs.h
@@ -35,6 +35,7 @@
 
 #include <linux/fs.h>
 #include <linux/time.h>
+#include <linux/backing-dev.h>
 #include "common.h"
 
 /* FIXME: Remove once pnfs hits mainline
@@ -84,6 +85,7 @@ struct exofs_sb_info {
         u32             s_next_generation;      /* next gen # to use          */
         atomic_t        s_curr_pending;         /* number of pending commands */
         uint8_t         s_cred[OSD_CAP_LEN];    /* credential for the fscb    */
+        struct          backing_dev_info bdi;   /* register our bdi with VFS  */
 
         struct pnfs_osd_data_map data_map;      /* Default raid to use
                                                  * FIXME: Needed ?
diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index 18e57ea1e5b4..03149b9a5178 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -302,6 +302,7 @@ static void exofs_put_super(struct super_block *sb)
         _exofs_print_device("Unmounting", NULL, sbi->layout.s_ods[0],
                             sbi->layout.s_pid);
 
+        bdi_destroy(&sbi->bdi);
         exofs_free_sbi(sbi);
         sb->s_fs_info = NULL;
 }
@@ -546,6 +547,10 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent)
         if (!sbi)
                 return -ENOMEM;
 
+        ret = bdi_setup_and_register(&sbi->bdi, "exofs", BDI_CAP_MAP_COPY);
+        if (ret)
+                goto free_bdi;
+
         /* use mount options to fill superblock */
         od = osduld_path_lookup(opts->dev_name);
         if (IS_ERR(od)) {
@@ -612,6 +617,7 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent)
         }
 
         /* set up operation vectors */
+        sb->s_bdi = &sbi->bdi;
         sb->s_fs_info = sbi;
         sb->s_op = &exofs_sops;
         sb->s_export_op = &exofs_export_ops;
@@ -643,6 +649,8 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent)
         return 0;
 
 free_sbi:
+        bdi_destroy(&sbi->bdi);
+free_bdi:
         EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",
                   opts->dev_name, sbi->layout.s_pid, ret);
         exofs_free_sbi(sbi);
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 94c8ee81f5e1..236b834b4ca8 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3879,6 +3879,7 @@ static int ext4_xattr_fiemap(struct inode *inode,
                 physical += offset;
                 length = EXT4_SB(inode->i_sb)->s_inode_size - offset;
                 flags |= FIEMAP_EXTENT_DATA_INLINE;
+                brelse(iloc.bh);
         } else { /* external block */
                 physical = EXT4_I(inode)->i_file_acl << blockbits;
                 length = inode->i_sb->s_blocksize;
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 5381802d6052..81d605412844 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5375,7 +5375,7 @@ int ext4_write_inode(struct inode *inode, struct writeback_control *wbc)
         } else {
                 struct ext4_iloc iloc;
 
-                err = ext4_get_inode_loc(inode, &iloc);
+                err = __ext4_get_inode_loc(inode, &iloc, 0);
                 if (err)
                         return err;
                 if (wbc->sync_mode == WB_SYNC_ALL)
@@ -5386,6 +5386,7 @@ int ext4_write_inode(struct inode *inode, struct writeback_control *wbc)
                                    (unsigned long long)iloc.bh->b_blocknr);
                         err = -EIO;
                 }
+                brelse(iloc.bh);
         }
         return err;
 }
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index bde9d0b170c2..b423a364dca3 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2535,6 +2535,17 @@ static void release_blocks_on_commit(journal_t *journal, transaction_t *txn)
                 mb_debug(1, "gonna free %u blocks in group %u (0x%p):",
                          entry->count, entry->group, entry);
 
+                if (test_opt(sb, DISCARD)) {
+                        ext4_fsblk_t discard_block;
+
+                        discard_block = entry->start_blk +
+                                ext4_group_first_block_no(sb, entry->group);
+                        trace_ext4_discard_blocks(sb,
+                                        (unsigned long long)discard_block,
+                                        entry->count);
+                        sb_issue_discard(sb, discard_block, entry->count);
+                }
+
                 err = ext4_mb_load_buddy(sb, entry->group, &e4b);
                 /* we expect to find existing buddy because it's pinned */
                 BUG_ON(err != 0);
@@ -2556,16 +2567,6 @@ static void release_blocks_on_commit(journal_t *journal, transaction_t *txn)
                         page_cache_release(e4b.bd_bitmap_page);
                 }
                 ext4_unlock_group(sb, entry->group);
-                if (test_opt(sb, DISCARD)) {
-                        ext4_fsblk_t discard_block;
-
-                        discard_block = entry->start_blk +
-                                ext4_group_first_block_no(sb, entry->group);
-                        trace_ext4_discard_blocks(sb,
-                                        (unsigned long long)discard_block,
-                                        entry->count);
-                        sb_issue_discard(sb, discard_block, entry->count);
-                }
                 kmem_cache_free(ext4_free_ext_cachep, entry);
                 ext4_mb_release_desc(&e4b);
         }
diff --git a/fs/ioctl.c b/fs/ioctl.c
index 6c751106c2e5..7faefb4da939 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -228,14 +228,23 @@ static int ioctl_fiemap(struct file *filp, unsigned long arg)
 
 #ifdef CONFIG_BLOCK
 
-#define blk_to_logical(inode, blk) (blk << (inode)->i_blkbits)
-#define logical_to_blk(inode, offset) (offset >> (inode)->i_blkbits);
+static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
+{
+        return (offset >> inode->i_blkbits);
+}
+
+static inline loff_t blk_to_logical(struct inode *inode, sector_t blk)
+{
+        return (blk << inode->i_blkbits);
+}
 
 /**
  * __generic_block_fiemap - FIEMAP for block based inodes (no locking)
- * @inode - the inode to map
- * @arg - the pointer to userspace where we copy everything to
- * @get_block - the fs's get_block function
+ * @inode: the inode to map
+ * @fieinfo: the fiemap info struct that will be passed back to userspace
+ * @start: where to start mapping in the inode
+ * @len: how much space to map
+ * @get_block: the fs's get_block function
  *
  * This does FIEMAP for block based inodes.  Basically it will just loop
  * through get_block until we hit the number of extents we want to map, or we
@@ -250,58 +259,63 @@ static int ioctl_fiemap(struct file *filp, unsigned long arg)
  */
 
 int __generic_block_fiemap(struct inode *inode,
-                           struct fiemap_extent_info *fieinfo, u64 start,
-                           u64 len, get_block_t *get_block)
+                           struct fiemap_extent_info *fieinfo, loff_t start,
+                           loff_t len, get_block_t *get_block)
 {
-        struct buffer_head tmp;
-        unsigned long long start_blk;
-        long long length = 0, map_len = 0;
+        struct buffer_head map_bh;
+        sector_t start_blk, last_blk;
+        loff_t isize = i_size_read(inode);
         u64 logical = 0, phys = 0, size = 0;
         u32 flags = FIEMAP_EXTENT_MERGED;
-        int ret = 0, past_eof = 0, whole_file = 0;
+        bool past_eof = false, whole_file = false;
+        int ret = 0;
 
-        if ((ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC)))
+        ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
+        if (ret)
                 return ret;
 
-        start_blk = logical_to_blk(inode, start);
-
-        length = (long long)min_t(u64, len, i_size_read(inode));
-        if (length < len)
-                whole_file = 1;
+        /*
+         * Either the i_mutex or other appropriate locking needs to be held
+         * since we expect isize to not change at all through the duration of
+         * this call.
+         */
+        if (len >= isize) {
+                whole_file = true;
+                len = isize;
+        }
 
-        map_len = length;
+        start_blk = logical_to_blk(inode, start);
+        last_blk = logical_to_blk(inode, start + len - 1);
 
         do {
                 /*
                  * we set b_size to the total size we want so it will map as
                  * many contiguous blocks as possible at once
                  */
-                memset(&tmp, 0, sizeof(struct buffer_head));
-                tmp.b_size = map_len;
+                memset(&map_bh, 0, sizeof(struct buffer_head));
+                map_bh.b_size = len;
 
-                ret = get_block(inode, start_blk, &tmp, 0);
+                ret = get_block(inode, start_blk, &map_bh, 0);
                 if (ret)
                         break;
 
                 /* HOLE */
-                if (!buffer_mapped(&tmp)) {
-                        length -= blk_to_logical(inode, 1);
+                if (!buffer_mapped(&map_bh)) {
                         start_blk++;
 
                         /*
-                         * we want to handle the case where there is an
+                         * We want to handle the case where there is an
                          * allocated block at the front of the file, and then
                          * nothing but holes up to the end of the file properly,
                          * to make sure that extent at the front gets properly
                          * marked with FIEMAP_EXTENT_LAST
                          */
                         if (!past_eof &&
-                            blk_to_logical(inode, start_blk) >=
-                            blk_to_logical(inode, 0)+i_size_read(inode))
+                            blk_to_logical(inode, start_blk) >= isize)
                                 past_eof = 1;
 
                         /*
-                         * first hole after going past the EOF, this is our
+                         * First hole after going past the EOF, this is our
                          * last extent
                          */
                         if (past_eof && size) {
@@ -309,15 +323,18 @@ int __generic_block_fiemap(struct inode *inode,
                                 ret = fiemap_fill_next_extent(fieinfo, logical,
                                                               phys, size,
                                                               flags);
-                                break;
+                        } else if (size) {
+                                ret = fiemap_fill_next_extent(fieinfo, logical,
+                                                              phys, size, flags);
+                                size = 0;
                         }
 
                         /* if we have holes up to/past EOF then we're done */
-                        if (length <= 0 || past_eof)
+                        if (start_blk > last_blk || past_eof || ret)
                                 break;
                 } else {
                         /*
-                         * we have gone over the length of what we wanted to
+                         * We have gone over the length of what we wanted to
                          * map, and it wasn't the entire file, so add the extent
                          * we got last time and exit.
                          *
@@ -331,7 +348,7 @@ int __generic_block_fiemap(struct inode *inode,
                          * are good to go, just add the extent to the fieinfo
                          * and break
                          */
-                        if (length <= 0 && !whole_file) {
+                        if (start_blk > last_blk && !whole_file) {
                                 ret = fiemap_fill_next_extent(fieinfo, logical,
                                                               phys, size,
                                                               flags);
@@ -351,11 +368,10 @@ int __generic_block_fiemap(struct inode *inode,
                         }
 
                         logical = blk_to_logical(inode, start_blk);
-                        phys = blk_to_logical(inode, tmp.b_blocknr);
-                        size = tmp.b_size;
+                        phys = blk_to_logical(inode, map_bh.b_blocknr);
+                        size = map_bh.b_size;
                         flags = FIEMAP_EXTENT_MERGED;
 
-                        length -= tmp.b_size;
                         start_blk += logical_to_blk(inode, size);
 
                         /*
@@ -363,15 +379,13 @@ int __generic_block_fiemap(struct inode *inode,
                          * soon as we find a hole that the last extent we found
                          * is marked with FIEMAP_EXTENT_LAST
                          */
-                        if (!past_eof &&
-                            logical+size >=
-                            blk_to_logical(inode, 0)+i_size_read(inode))
-                                past_eof = 1;
+                        if (!past_eof && logical + size >= isize)
+                                past_eof = true;
                 }
                 cond_resched();
         } while (1);
 
-        /* if ret is 1 then we just hit the end of the extent array */
+        /* If ret is 1 then we just hit the end of the extent array */
         if (ret == 1)
                 ret = 0;
 
diff --git a/fs/ncpfs/inode.c b/fs/ncpfs/inode.c
index cf98da1be23e..fa3385154023 100644
--- a/fs/ncpfs/inode.c
+++ b/fs/ncpfs/inode.c
@@ -526,10 +526,15 @@ static int ncp_fill_super(struct super_block *sb, void *raw_data, int silent)
         sb->s_blocksize_bits = 10;
         sb->s_magic = NCP_SUPER_MAGIC;
         sb->s_op = &ncp_sops;
+        sb->s_bdi = &server->bdi;
 
         server = NCP_SBP(sb);
         memset(server, 0, sizeof(*server));
 
+        error = bdi_setup_and_register(&server->bdi, "ncpfs", BDI_CAP_MAP_COPY);
+        if (error)
+                goto out_bdi;
+
         server->ncp_filp = ncp_filp;
         server->ncp_sock = sock;
         
@@ -719,6 +724,8 @@ out_fput2:
         if (server->info_filp)
                 fput(server->info_filp);
 out_fput:
+        bdi_destroy(&server->bdi);
+out_bdi:
         /* 23/12/1998 Marcin Dalecki <dalecki@cs.net.pl>:
          * 
          * The previously used put_filp(ncp_filp); was bogous, since
@@ -756,6 +763,7 @@ static void ncp_put_super(struct super_block *sb)
         kill_pid(server->m.wdog_pid, SIGTERM, 1);
         put_pid(server->m.wdog_pid);
 
+        bdi_destroy(&server->bdi);
         kfree(server->priv.data);
         kfree(server->auth.object_name);
         vfree(server->rxbuf);
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index a8766c4ef2e0..acc9c4943b84 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -966,6 +966,8 @@ out_error:
 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
 {
         target->flags = source->flags;
+        target->rsize = source->rsize;
+        target->wsize = source->wsize;
         target->acregmin = source->acregmin;
         target->acregmax = source->acregmax;
         target->acdirmin = source->acdirmin;
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index be46f26c9a56..a7bb5c694aa3 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -837,6 +837,8 @@ out_zap_parent:
                 /* If we have submounts, don't unhash ! */
                 if (have_submounts(dentry))
                         goto out_valid;
+                if (dentry->d_flags & DCACHE_DISCONNECTED)
+                        goto out_valid;
                 shrink_dcache_parent(dentry);
         }
         d_drop(dentry);
@@ -1050,7 +1052,7 @@ static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd)
         struct inode *dir;
         int openflags, ret = 0;
 
-        if (!is_atomic_open(nd))
+        if (!is_atomic_open(nd) || d_mountpoint(dentry))
                 goto no_open;
         parent = dget_parent(dentry);
         dir = parent->d_inode;
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 638067007c65..071fcedd517c 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -5218,9 +5218,12 @@ static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
         msg.rpc_resp = &calldata->res;
         task_setup_data.callback_data = calldata;
         task = rpc_run_task(&task_setup_data);
-        if (IS_ERR(task))
+        if (IS_ERR(task)) {
                 status = PTR_ERR(task);
+                goto out;
+        }
         rpc_put_task(task);
+        return 0;
 out:
         dprintk("<-- %s status=%d\n", __func__, status);
         return status;
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index e01637240eeb..b4148fc00f9f 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2187,6 +2187,7 @@ static int nfs_get_sb(struct file_system_type *fs_type,
         if (data->version == 4) {
                 error = nfs4_try_mount(flags, dev_name, data, mnt);
                 kfree(data->client_address);
+                kfree(data->nfs_server.export_path);
                 goto out;
         }
 #endif  /* CONFIG_NFS_V4 */
@@ -2657,7 +2658,7 @@ static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
         devname = nfs_path(path->mnt->mnt_devname,
                         path->mnt->mnt_root, path->dentry,
                         page, PAGE_SIZE);
-        if (devname == NULL)
+        if (IS_ERR(devname))
                 goto out_freepage;
         tmp = kstrdup(devname, GFP_KERNEL);
         if (tmp == NULL)
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index de38d63aa920..3aea3ca98ab7 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -1201,6 +1201,25 @@ int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
 
 
 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
+static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait)
+{
+        if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags))
+                return 1;
+        if (may_wait && !out_of_line_wait_on_bit_lock(&nfsi->flags,
+                                NFS_INO_COMMIT, nfs_wait_bit_killable,
+                                TASK_KILLABLE))
+                return 1;
+        return 0;
+}
+
+static void nfs_commit_clear_lock(struct nfs_inode *nfsi)
+{
+        clear_bit(NFS_INO_COMMIT, &nfsi->flags);
+        smp_mb__after_clear_bit();
+        wake_up_bit(&nfsi->flags, NFS_INO_COMMIT);
+}
+
+
 static void nfs_commitdata_release(void *data)
 {
         struct nfs_write_data *wdata = data;
@@ -1262,8 +1281,6 @@ static int nfs_commit_rpcsetup(struct list_head *head,
         task = rpc_run_task(&task_setup_data);
         if (IS_ERR(task))
                 return PTR_ERR(task);
-        if (how & FLUSH_SYNC)
-                rpc_wait_for_completion_task(task);
         rpc_put_task(task);
         return 0;
 }
@@ -1294,6 +1311,7 @@ nfs_commit_list(struct inode *inode, struct list_head *head, int how)
                                 BDI_RECLAIMABLE);
                 nfs_clear_page_tag_locked(req);
         }
+        nfs_commit_clear_lock(NFS_I(inode));
         return -ENOMEM;
 }
 
@@ -1349,6 +1367,7 @@ static void nfs_commit_release(void *calldata)
         next:
                 nfs_clear_page_tag_locked(req);
         }
+        nfs_commit_clear_lock(NFS_I(data->inode));
         nfs_commitdata_release(calldata);
 }
 
@@ -1363,8 +1382,11 @@ static const struct rpc_call_ops nfs_commit_ops = {
 static int nfs_commit_inode(struct inode *inode, int how)
 {
         LIST_HEAD(head);
-        int res;
+        int may_wait = how & FLUSH_SYNC;
+        int res = 0;
 
+        if (!nfs_commit_set_lock(NFS_I(inode), may_wait))
+                goto out;
         spin_lock(&inode->i_lock);
         res = nfs_scan_commit(inode, &head, 0, 0);
         spin_unlock(&inode->i_lock);
@@ -1372,7 +1394,13 @@ static int nfs_commit_inode(struct inode *inode, int how)
                 int error = nfs_commit_list(inode, &head, how);
                 if (error < 0)
                         return error;
-        }
+                if (may_wait)
+                        wait_on_bit(&NFS_I(inode)->flags, NFS_INO_COMMIT,
+                                        nfs_wait_bit_killable,
+                                        TASK_KILLABLE);
+        } else
+                nfs_commit_clear_lock(NFS_I(inode));
+out:
         return res;
 }
 
@@ -1444,6 +1472,7 @@ int nfs_wb_page_cancel(struct inode *inode, struct page *page)
 
         BUG_ON(!PageLocked(page));
         for (;;) {
+                wait_on_page_writeback(page);
                 req = nfs_page_find_request(page);
                 if (req == NULL)
                         break;
@@ -1478,30 +1507,18 @@ int nfs_wb_page(struct inode *inode, struct page *page)
                 .range_start = range_start,
                 .range_end = range_end,
         };
-        struct nfs_page *req;
-        int need_commit;
         int ret;
 
         while(PagePrivate(page)) {
+                wait_on_page_writeback(page);
                 if (clear_page_dirty_for_io(page)) {
                         ret = nfs_writepage_locked(page, &wbc);
                         if (ret < 0)
                                 goto out_error;
                 }
-                req = nfs_find_and_lock_request(page);
-                if (!req)
-                        break;
-                if (IS_ERR(req)) {
-                        ret = PTR_ERR(req);
+                ret = sync_inode(inode, &wbc);
+                if (ret < 0)
                         goto out_error;
-                }
-                need_commit = test_bit(PG_CLEAN, &req->wb_flags);
-                nfs_clear_page_tag_locked(req);
-                if (need_commit) {
-                        ret = nfs_commit_inode(inode, FLUSH_SYNC);
-                        if (ret < 0)
-                                goto out_error;
-                }
         }
         return 0;
 out_error:
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index e1703175ee28..34ccf815ea8a 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -161,10 +161,10 @@ static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
         argp->p = page_address(argp->pagelist[0]);
         argp->pagelist++;
         if (argp->pagelen < PAGE_SIZE) {
-                argp->end = p + (argp->pagelen>>2);
+                argp->end = argp->p + (argp->pagelen>>2);
                 argp->pagelen = 0;
         } else {
-                argp->end = p + (PAGE_SIZE>>2);
+                argp->end = argp->p + (PAGE_SIZE>>2);
                 argp->pagelen -= PAGE_SIZE;
         }
         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
@@ -1426,10 +1426,10 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
                         argp->p = page_address(argp->pagelist[0]);
                         argp->pagelist++;
                         if (argp->pagelen < PAGE_SIZE) {
-                                argp->end = p + (argp->pagelen>>2);
+                                argp->end = argp->p + (argp->pagelen>>2);
                                 argp->pagelen = 0;
                         } else {
-                                argp->end = p + (PAGE_SIZE>>2);
+                                argp->end = argp->p + (PAGE_SIZE>>2);
                                 argp->pagelen -= PAGE_SIZE;
                         }
                 }
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 7621db800a74..8418fcc0a6ab 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2909,7 +2909,7 @@ out_no_task:
  */
 static const struct pid_entry tid_base_stuff[] = {
         DIR("fd",        S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
-        DIR("fdinfo",    S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fd_operations),
+        DIR("fdinfo",    S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
         REG("environ",   S_IRUSR, proc_environ_operations),
         INF("auxv",      S_IRUSR, proc_pid_auxv),
         ONE("status",    S_IRUGO, proc_pid_status),
diff --git a/fs/reiserfs/dir.c b/fs/reiserfs/dir.c
index f8a6075abf50..07930449a958 100644
--- a/fs/reiserfs/dir.c
+++ b/fs/reiserfs/dir.c
@@ -46,8 +46,6 @@ static inline bool is_privroot_deh(struct dentry *dir,
                                    struct reiserfs_de_head *deh)
 {
         struct dentry *privroot = REISERFS_SB(dir->d_sb)->priv_root;
-        if (reiserfs_expose_privroot(dir->d_sb))
-                return 0;
         return (dir == dir->d_parent && privroot->d_inode &&
                 deh->deh_objectid == INODE_PKEY(privroot->d_inode)->k_objectid);
 }
diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index 4f9586bb7631..e7cc00e636dc 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -554,7 +554,7 @@ reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th,
         if (!err && new_size < i_size_read(dentry->d_inode)) {
                 struct iattr newattrs = {
                         .ia_ctime = current_fs_time(inode->i_sb),
-                        .ia_size = buffer_size,
+                        .ia_size = new_size,
                         .ia_valid = ATTR_SIZE | ATTR_CTIME,
                 };
 
@@ -973,21 +973,13 @@ int reiserfs_permission(struct inode *inode, int mask)
         return generic_permission(inode, mask, NULL);
 }
 
-/* This will catch lookups from the fs root to .reiserfs_priv */
-static int
-xattr_lookup_poison(struct dentry *dentry, struct qstr *q1, struct qstr *name)
+static int xattr_hide_revalidate(struct dentry *dentry, struct nameidata *nd)
 {
-        struct dentry *priv_root = REISERFS_SB(dentry->d_sb)->priv_root;
-        if (container_of(q1, struct dentry, d_name) == priv_root)
-                return -ENOENT;
-        if (q1->len == name->len &&
-                   !memcmp(q1->name, name->name, name->len))
-                return 0;
-        return 1;
+        return -EPERM;
 }
 
 static const struct dentry_operations xattr_lookup_poison_ops = {
-        .d_compare = xattr_lookup_poison,
+        .d_revalidate = xattr_hide_revalidate,
 };
 
 int reiserfs_lookup_privroot(struct super_block *s)
@@ -1001,8 +993,7 @@ int reiserfs_lookup_privroot(struct super_block *s)
                                 strlen(PRIVROOT_NAME));
         if (!IS_ERR(dentry)) {
                 REISERFS_SB(s)->priv_root = dentry;
-                if (!reiserfs_expose_privroot(s))
-                        s->s_root->d_op = &xattr_lookup_poison_ops;
+                dentry->d_op = &xattr_lookup_poison_ops;
                 if (dentry->d_inode)
                         dentry->d_inode->i_flags |= S_PRIVATE;
         } else
diff --git a/fs/smbfs/inode.c b/fs/smbfs/inode.c
index 1c4c8f089970..dfa1d67f8fca 100644
--- a/fs/smbfs/inode.c
+++ b/fs/smbfs/inode.c
@@ -479,6 +479,7 @@ smb_put_super(struct super_block *sb)
         if (server->conn_pid)
                 kill_pid(server->conn_pid, SIGTERM, 1);
 
+        bdi_destroy(&server->bdi);
         kfree(server->ops);
         smb_unload_nls(server);
         sb->s_fs_info = NULL;
@@ -525,6 +526,11 @@ static int smb_fill_super(struct super_block *sb, void *raw_data, int silent)
         if (!server)
                 goto out_no_server;
         sb->s_fs_info = server;
+        
+        if (bdi_setup_and_register(&server->bdi, "smbfs", BDI_CAP_MAP_COPY))
+                goto out_bdi;
+
+        sb->s_bdi = &server->bdi;
 
         server->super_block = sb;
         server->mnt = NULL;
@@ -624,6 +630,8 @@ out_no_smbiod:
 out_bad_option:
         kfree(mem);
 out_no_mem:
+        bdi_destroy(&server->bdi);
+out_bdi:
         if (!server->mnt)
                 printk(KERN_ERR "smb_fill_super: allocation failure\n");
         sb->s_fs_info = NULL;
diff --git a/fs/squashfs/block.c b/fs/squashfs/block.c
index 1cb0d81b164b..653c030eb840 100644
--- a/fs/squashfs/block.c
+++ b/fs/squashfs/block.c
@@ -87,9 +87,8 @@ int squashfs_read_data(struct super_block *sb, void **buffer, u64 index,
         u64 cur_index = index >> msblk->devblksize_log2;
         int bytes, compressed, b = 0, k = 0, page = 0, avail;
 
-
-        bh = kcalloc((msblk->block_size >> msblk->devblksize_log2) + 1,
-                                sizeof(*bh), GFP_KERNEL);
+        bh = kcalloc(((srclength + msblk->devblksize - 1)
+                >> msblk->devblksize_log2) + 1, sizeof(*bh), GFP_KERNEL);
         if (bh == NULL)
                 return -ENOMEM;
 
diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c
index 3550aec2f655..48b6f4a385a6 100644
--- a/fs/squashfs/super.c
+++ b/fs/squashfs/super.c
@@ -275,7 +275,8 @@ allocate_root:
 
         err = squashfs_read_inode(root, root_inode);
         if (err) {
-                iget_failed(root);
+                make_bad_inode(root);
+                iput(root);
                 goto failed_mount;
         }
         insert_inode_hash(root);
@@ -353,6 +354,7 @@ static void squashfs_put_super(struct super_block *sb)
                 kfree(sbi->id_table);
                 kfree(sbi->fragment_index);
                 kfree(sbi->meta_index);
+                kfree(sbi->inode_lookup_table);
                 kfree(sb->s_fs_info);
                 sb->s_fs_info = NULL;
         }
diff --git a/fs/squashfs/zlib_wrapper.c b/fs/squashfs/zlib_wrapper.c
index 15a03d0fb9f3..7a603874e483 100644
--- a/fs/squashfs/zlib_wrapper.c
+++ b/fs/squashfs/zlib_wrapper.c
@@ -128,8 +128,9 @@ static int zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer,
                 goto release_mutex;
         }
 
+        length = stream->total_out;
         mutex_unlock(&msblk->read_data_mutex);
-        return stream->total_out;
+        return length;
 
 release_mutex:
         mutex_unlock(&msblk->read_data_mutex);
diff --git a/fs/super.c b/fs/super.c
index f35ac6022109..1527e6a0ee35 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -37,6 +37,7 @@
 #include <linux/kobject.h>
 #include <linux/mutex.h>
 #include <linux/file.h>
+#include <linux/backing-dev.h>
 #include <asm/uaccess.h>
 #include "internal.h"
 
@@ -693,6 +694,7 @@ int set_anon_super(struct super_block *s, void *data)
                 return -EMFILE;
         }
         s->s_dev = MKDEV(0, dev & MINORMASK);
+        s->s_bdi = &noop_backing_dev_info;
         return 0;
 }
 
@@ -954,10 +956,11 @@ vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void
         if (error < 0)
                 goto out_free_secdata;
         BUG_ON(!mnt->mnt_sb);
+        WARN_ON(!mnt->mnt_sb->s_bdi);
 
-        error = security_sb_kern_mount(mnt->mnt_sb, flags, secdata);
-        if (error)
-                goto out_sb;
+        error = security_sb_kern_mount(mnt->mnt_sb, flags, secdata);
+        if (error)
+                goto out_sb;
 
         /*
          * filesystems should never set s_maxbytes larger than MAX_LFS_FILESIZE
diff --git a/fs/sync.c b/fs/sync.c
index fc5c3d75cf3c..92b228176f7c 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -14,6 +14,7 @@
 #include <linux/pagemap.h>
 #include <linux/quotaops.h>
 #include <linux/buffer_head.h>
+#include <linux/backing-dev.h>
 #include "internal.h"
 
 #define VALID_FLAGS (SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE| \
@@ -32,7 +33,7 @@ static int __sync_filesystem(struct super_block *sb, int wait)
          * This should be safe, as we require bdi backing to actually
          * write out data in the first place
          */
-        if (!sb->s_bdi)
+        if (!sb->s_bdi || sb->s_bdi == &noop_backing_dev_info)
                 return 0;
 
         if (sb->s_qcop && sb->s_qcop->quota_sync)
diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index 52e06b487ced..29f1edca76de 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/fs/xfs/linux-2.6/xfs_super.c
@@ -1209,6 +1209,7 @@ xfs_fs_put_super(
 
         xfs_unmountfs(mp);
         xfs_freesb(mp);
+        xfs_inode_shrinker_unregister(mp);
         xfs_icsb_destroy_counters(mp);
         xfs_close_devices(mp);
         xfs_dmops_put(mp);
@@ -1622,6 +1623,8 @@ xfs_fs_fill_super(
         if (error)
                 goto fail_vnrele;
 
+        xfs_inode_shrinker_register(mp);
+
         kfree(mtpt);
         return 0;
 
@@ -1867,6 +1870,7 @@ init_xfs_fs(void)
                 goto out_cleanup_procfs;
 
         vfs_initquota();
+        xfs_inode_shrinker_init();
 
         error = register_filesystem(&xfs_fs_type);
         if (error)
@@ -1894,6 +1898,7 @@ exit_xfs_fs(void)
 {
         vfs_exitquota();
         unregister_filesystem(&xfs_fs_type);
+        xfs_inode_shrinker_destroy();
         xfs_sysctl_unregister();
         xfs_cleanup_procfs();
         xfs_buf_terminate();
diff --git a/fs/xfs/linux-2.6/xfs_sync.c b/fs/xfs/linux-2.6/xfs_sync.c
index fd9698215759..a427c638d909 100644
--- a/fs/xfs/linux-2.6/xfs_sync.c
+++ b/fs/xfs/linux-2.6/xfs_sync.c
@@ -95,7 +95,8 @@ xfs_inode_ag_walk(
                                            struct xfs_perag *pag, int flags),
         int                     flags,
         int                     tag,
-        int                     exclusive)
+        int                     exclusive,
+        int                     *nr_to_scan)
 {
         uint32_t                first_index;
         int                     last_error = 0;
@@ -134,7 +135,7 @@ restart:
                 if (error == EFSCORRUPTED)
                         break;
 
-        } while (1);
+        } while ((*nr_to_scan)--);
 
         if (skipped) {
                 delay(1);
@@ -150,12 +151,15 @@ xfs_inode_ag_iterator(
                                            struct xfs_perag *pag, int flags),
         int                     flags,
         int                     tag,
-        int                     exclusive)
+        int                     exclusive,
+        int                     *nr_to_scan)
 {
         int                     error = 0;
         int                     last_error = 0;
         xfs_agnumber_t          ag;
+        int                     nr;
 
+        nr = nr_to_scan ? *nr_to_scan : INT_MAX;
         for (ag = 0; ag < mp->m_sb.sb_agcount; ag++) {
                 struct xfs_perag        *pag;
 
@@ -165,14 +169,18 @@ xfs_inode_ag_iterator(
                         continue;
                 }
                 error = xfs_inode_ag_walk(mp, pag, execute, flags, tag,
-                                                exclusive);
+                                                exclusive, &nr);
                 xfs_perag_put(pag);
                 if (error) {
                         last_error = error;
                         if (error == EFSCORRUPTED)
                                 break;
                 }
+                if (nr <= 0)
+                        break;
         }
+        if (nr_to_scan)
+                *nr_to_scan = nr;
         return XFS_ERROR(last_error);
 }
 
@@ -291,7 +299,7 @@ xfs_sync_data(
         ASSERT((flags & ~(SYNC_TRYLOCK|SYNC_WAIT)) == 0);
 
         error = xfs_inode_ag_iterator(mp, xfs_sync_inode_data, flags,
-                                      XFS_ICI_NO_TAG, 0);
+                                      XFS_ICI_NO_TAG, 0, NULL);
         if (error)
                 return XFS_ERROR(error);
 
@@ -310,7 +318,7 @@ xfs_sync_attr(
         ASSERT((flags & ~SYNC_WAIT) == 0);
 
         return xfs_inode_ag_iterator(mp, xfs_sync_inode_attr, flags,
-                                     XFS_ICI_NO_TAG, 0);
+                                     XFS_ICI_NO_TAG, 0, NULL);
 }
 
 STATIC int
@@ -673,6 +681,7 @@ __xfs_inode_set_reclaim_tag(
         radix_tree_tag_set(&pag->pag_ici_root,
                            XFS_INO_TO_AGINO(ip->i_mount, ip->i_ino),
                            XFS_ICI_RECLAIM_TAG);
+        pag->pag_ici_reclaimable++;
 }
 
 /*
@@ -705,6 +714,7 @@ __xfs_inode_clear_reclaim_tag(
 {
         radix_tree_tag_clear(&pag->pag_ici_root,
                         XFS_INO_TO_AGINO(mp, ip->i_ino), XFS_ICI_RECLAIM_TAG);
+        pag->pag_ici_reclaimable--;
 }
 
 /*
@@ -854,5 +864,93 @@ xfs_reclaim_inodes(
         int             mode)
 {
         return xfs_inode_ag_iterator(mp, xfs_reclaim_inode, mode,
-                                        XFS_ICI_RECLAIM_TAG, 1);
+                                        XFS_ICI_RECLAIM_TAG, 1, NULL);
+}
+
+/*
+ * Shrinker infrastructure.
+ *
+ * This is all far more complex than it needs to be. It adds a global list of
+ * mounts because the shrinkers can only call a global context. We need to make
+ * the shrinkers pass a context to avoid the need for global state.
+ */
+static LIST_HEAD(xfs_mount_list);
+static struct rw_semaphore xfs_mount_list_lock;
+
+static int
+xfs_reclaim_inode_shrink(
+        int             nr_to_scan,
+        gfp_t           gfp_mask)
+{
+        struct xfs_mount *mp;
+        struct xfs_perag *pag;
+        xfs_agnumber_t  ag;
+        int             reclaimable = 0;
+
+        if (nr_to_scan) {
+                if (!(gfp_mask & __GFP_FS))
+                        return -1;
+
+                down_read(&xfs_mount_list_lock);
+                list_for_each_entry(mp, &xfs_mount_list, m_mplist) {
+                        xfs_inode_ag_iterator(mp, xfs_reclaim_inode, 0,
+                                        XFS_ICI_RECLAIM_TAG, 1, &nr_to_scan);
+                        if (nr_to_scan <= 0)
+                                break;
+                }
+                up_read(&xfs_mount_list_lock);
+        }
+
+        down_read(&xfs_mount_list_lock);
+        list_for_each_entry(mp, &xfs_mount_list, m_mplist) {
+                for (ag = 0; ag < mp->m_sb.sb_agcount; ag++) {
+
+                        pag = xfs_perag_get(mp, ag);
+                        if (!pag->pag_ici_init) {
+                                xfs_perag_put(pag);
+                                continue;
+                        }
+                        reclaimable += pag->pag_ici_reclaimable;
+                        xfs_perag_put(pag);
+                }
+        }
+        up_read(&xfs_mount_list_lock);
+        return reclaimable;
+}
+
+static struct shrinker xfs_inode_shrinker = {
+        .shrink = xfs_reclaim_inode_shrink,
+        .seeks = DEFAULT_SEEKS,
+};
+
+void __init
+xfs_inode_shrinker_init(void)
+{
+        init_rwsem(&xfs_mount_list_lock);
+        register_shrinker(&xfs_inode_shrinker);
+}
+
+void
+xfs_inode_shrinker_destroy(void)
+{
+        ASSERT(list_empty(&xfs_mount_list));
+        unregister_shrinker(&xfs_inode_shrinker);
+}
+
+void
+xfs_inode_shrinker_register(
+        struct xfs_mount        *mp)
+{
+        down_write(&xfs_mount_list_lock);
+        list_add_tail(&mp->m_mplist, &xfs_mount_list);
+        up_write(&xfs_mount_list_lock);
+}
+
+void
+xfs_inode_shrinker_unregister(
+        struct xfs_mount        *mp)
+{
+        down_write(&xfs_mount_list_lock);
+        list_del(&mp->m_mplist);
+        up_write(&xfs_mount_list_lock);
 }
diff --git a/fs/xfs/linux-2.6/xfs_sync.h b/fs/xfs/linux-2.6/xfs_sync.h
index d480c346cabb..cdcbaaca9880 100644
--- a/fs/xfs/linux-2.6/xfs_sync.h
+++ b/fs/xfs/linux-2.6/xfs_sync.h
@@ -53,6 +53,11 @@ void __xfs_inode_clear_reclaim_tag(struct xfs_mount *mp, struct xfs_perag *pag,
 int xfs_sync_inode_valid(struct xfs_inode *ip, struct xfs_perag *pag);
 int xfs_inode_ag_iterator(struct xfs_mount *mp,
         int (*execute)(struct xfs_inode *ip, struct xfs_perag *pag, int flags),
-        int flags, int tag, int write_lock);
+        int flags, int tag, int write_lock, int *nr_to_scan);
+
+void xfs_inode_shrinker_init(void);
+void xfs_inode_shrinker_destroy(void);
+void xfs_inode_shrinker_register(struct xfs_mount *mp);
+void xfs_inode_shrinker_unregister(struct xfs_mount *mp);
 
 #endif
diff --git a/fs/xfs/quota/xfs_qm_syscalls.c b/fs/xfs/quota/xfs_qm_syscalls.c
index 5d0ee8d492db..50bee07d6b0e 100644
--- a/fs/xfs/quota/xfs_qm_syscalls.c
+++ b/fs/xfs/quota/xfs_qm_syscalls.c
@@ -891,7 +891,8 @@ xfs_qm_dqrele_all_inodes(
         uint             flags)
 {
         ASSERT(mp->m_quotainfo);
-        xfs_inode_ag_iterator(mp, xfs_dqrele_inode, flags, XFS_ICI_NO_TAG, 0);
+        xfs_inode_ag_iterator(mp, xfs_dqrele_inode, flags,
+                                XFS_ICI_NO_TAG, 0, NULL);
 }
 
 /*------------------------------------------------------------------------*/
diff --git a/fs/xfs/xfs_ag.h b/fs/xfs/xfs_ag.h
index b1a5a1ff88ea..abb8222b88c9 100644
--- a/fs/xfs/xfs_ag.h
+++ b/fs/xfs/xfs_ag.h
@@ -223,6 +223,7 @@ typedef struct xfs_perag {
         int             pag_ici_init;   /* incore inode cache initialised */
         rwlock_t        pag_ici_lock;   /* incore inode lock */
         struct radix_tree_root pag_ici_root;    /* incore inode cache root */
+        int             pag_ici_reclaimable;    /* reclaimable inodes */
 #endif
         int             pagb_count;     /* pagb slots in use */
         xfs_perag_busy_t pagb_list[XFS_PAGB_NUM_SLOTS]; /* unstable blocks */
diff --git a/fs/xfs/xfs_dfrag.c b/fs/xfs/xfs_dfrag.c
index cd27c9d6c71f..5bba29a07812 100644
--- a/fs/xfs/xfs_dfrag.c
+++ b/fs/xfs/xfs_dfrag.c
@@ -177,16 +177,26 @@ xfs_swap_extents_check_format(
             XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) > tip->i_df.if_ext_max)
                 return EINVAL;
 
-        /* Check root block of temp in btree form to max in target */
+        /*
+         * If we are in a btree format, check that the temp root block will fit
+         * in the target and that it has enough extents to be in btree format
+         * in the target.
+         *
+         * Note that we have to be careful to allow btree->extent conversions
+         * (a common defrag case) which will occur when the temp inode is in
+         * extent format...
+         */
         if (tip->i_d.di_format == XFS_DINODE_FMT_BTREE &&
-            XFS_IFORK_BOFF(ip) &&
-            tip->i_df.if_broot_bytes > XFS_IFORK_BOFF(ip))
+            ((XFS_IFORK_BOFF(ip) &&
+              tip->i_df.if_broot_bytes > XFS_IFORK_BOFF(ip)) ||
+             XFS_IFORK_NEXTENTS(tip, XFS_DATA_FORK) <= ip->i_df.if_ext_max))
                 return EINVAL;
 
-        /* Check root block of target in btree form to max in temp */
+        /* Reciprocal target->temp btree format checks */
         if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE &&
-            XFS_IFORK_BOFF(tip) &&
-            ip->i_df.if_broot_bytes > XFS_IFORK_BOFF(tip))
+            ((XFS_IFORK_BOFF(tip) &&
+              ip->i_df.if_broot_bytes > XFS_IFORK_BOFF(tip)) ||
+             XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) <= tip->i_df.if_ext_max))
                 return EINVAL;
 
         return 0;
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 4fa0bc7b983e..9ff48a16a7ee 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -259,6 +259,7 @@ typedef struct xfs_mount {
         wait_queue_head_t       m_wait_single_sync_task;
         __int64_t               m_update_flags; /* sb flags we need to update
                                                    on the next remount,rw */
+        struct list_head        m_mplist;       /* inode shrinker mount list */
 } xfs_mount_t;
 
 /*