Merge commit 'v2.6.37' into sched/core

Merge reason: Merge the final .37 tree.

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

20 files changed, 188 insertions, 87 deletions

diff --git a/fs/btrfs/export.c b/fs/btrfs/export.c
index 6f044447359..659f532d26a 100644
--- a/fs/btrfs/export.c
+++ b/fs/btrfs/export.c
@@ -166,7 +166,7 @@ static struct dentry *btrfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
 static struct dentry *btrfs_get_parent(struct dentry *child)
 {
         struct inode *dir = child->d_inode;
-        static struct dentry *dentry;
+        struct dentry *dentry;
         struct btrfs_root *root = BTRFS_I(dir)->root;
         struct btrfs_path *path;
         struct extent_buffer *leaf;
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 158c700fdca..d902948a90d 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -40,7 +40,8 @@ int ceph_init_dentry(struct dentry *dentry)
         if (dentry->d_fsdata)
                 return 0;
 
-        if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
+        if (dentry->d_parent == NULL ||   /* nfs fh_to_dentry */
+            ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
                 dentry->d_op = &ceph_dentry_ops;
         else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR)
                 dentry->d_op = &ceph_snapdir_dentry_ops;
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 8d79b8912e3..7d0e4a82d89 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -282,7 +282,8 @@ int ceph_release(struct inode *inode, struct file *file)
 static int striped_read(struct inode *inode,
                         u64 off, u64 len,
                         struct page **pages, int num_pages,
-                        int *checkeof, bool align_to_pages)
+                        int *checkeof, bool align_to_pages,
+                        unsigned long buf_align)
 {
         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
         struct ceph_inode_info *ci = ceph_inode(inode);
@@ -307,7 +308,7 @@ static int striped_read(struct inode *inode,
 
 more:
         if (align_to_pages)
-                page_align = (pos - io_align) & ~PAGE_MASK;
+                page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
         else
                 page_align = pos & ~PAGE_MASK;
         this_len = left;
@@ -376,16 +377,18 @@ static ssize_t ceph_sync_read(struct file *file, char __user *data,
         struct inode *inode = file->f_dentry->d_inode;
         struct page **pages;
         u64 off = *poff;
-        int num_pages = calc_pages_for(off, len);
-        int ret;
+        int num_pages, ret;
 
         dout("sync_read on file %p %llu~%u %s\n", file, off, len,
              (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
 
-        if (file->f_flags & O_DIRECT)
-                pages = ceph_get_direct_page_vector(data, num_pages);
-        else
+        if (file->f_flags & O_DIRECT) {
+                num_pages = calc_pages_for((unsigned long)data, len);
+                pages = ceph_get_direct_page_vector(data, num_pages, true);
+        } else {
+                num_pages = calc_pages_for(off, len);
                 pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
+        }
         if (IS_ERR(pages))
                 return PTR_ERR(pages);
 
@@ -400,7 +403,8 @@ static ssize_t ceph_sync_read(struct file *file, char __user *data,
                 goto done;
 
         ret = striped_read(inode, off, len, pages, num_pages, checkeof,
-                           file->f_flags & O_DIRECT);
+                           file->f_flags & O_DIRECT,
+                           (unsigned long)data & ~PAGE_MASK);
 
         if (ret >= 0 && (file->f_flags & O_DIRECT) == 0)
                 ret = ceph_copy_page_vector_to_user(pages, data, off, ret);
@@ -409,7 +413,7 @@ static ssize_t ceph_sync_read(struct file *file, char __user *data,
 
 done:
         if (file->f_flags & O_DIRECT)
-                ceph_put_page_vector(pages, num_pages);
+                ceph_put_page_vector(pages, num_pages, true);
         else
                 ceph_release_page_vector(pages, num_pages);
         dout("sync_read result %d\n", ret);
@@ -456,6 +460,7 @@ static ssize_t ceph_sync_write(struct file *file, const char __user *data,
         int do_sync = 0;
         int check_caps = 0;
         int page_align, io_align;
+        unsigned long buf_align;
         int ret;
         struct timespec mtime = CURRENT_TIME;
 
@@ -471,6 +476,7 @@ static ssize_t ceph_sync_write(struct file *file, const char __user *data,
                 pos = *offset;
 
         io_align = pos & ~PAGE_MASK;
+        buf_align = (unsigned long)data & ~PAGE_MASK;
 
         ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + left);
         if (ret < 0)
@@ -496,12 +502,15 @@ static ssize_t ceph_sync_write(struct file *file, const char __user *data,
          */
 more:
         len = left;
-        if (file->f_flags & O_DIRECT)
+        if (file->f_flags & O_DIRECT) {
                 /* write from beginning of first page, regardless of
                    io alignment */
-                page_align = (pos - io_align) & ~PAGE_MASK;
-        else
+                page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
+                num_pages = calc_pages_for((unsigned long)data, len);
+        } else {
                 page_align = pos & ~PAGE_MASK;
+                num_pages = calc_pages_for(pos, len);
+        }
         req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
                                     ceph_vino(inode), pos, &len,
                                     CEPH_OSD_OP_WRITE, flags,
@@ -512,10 +521,8 @@ more:
         if (!req)
                 return -ENOMEM;
 
-        num_pages = calc_pages_for(pos, len);
-
         if (file->f_flags & O_DIRECT) {
-                pages = ceph_get_direct_page_vector(data, num_pages);
+                pages = ceph_get_direct_page_vector(data, num_pages, false);
                 if (IS_ERR(pages)) {
                         ret = PTR_ERR(pages);
                         goto out;
@@ -565,7 +572,7 @@ more:
         }
 
         if (file->f_flags & O_DIRECT)
-                ceph_put_page_vector(pages, num_pages);
+                ceph_put_page_vector(pages, num_pages, false);
         else if (file->f_flags & O_SYNC)
                 ceph_release_page_vector(pages, num_pages);
 
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index dc963929de6..981c8477ada 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -232,6 +232,8 @@ static int setup_new_group_blocks(struct super_block *sb,
                                GFP_NOFS);
         if (err)
                 goto exit_bh;
+        for (i = 0, bit = gdblocks + 1; i < reserved_gdb; i++, bit++)
+                ext4_set_bit(bit, bh->b_data);
 
         ext4_debug("mark block bitmap %#04llx (+%llu)\n", input->block_bitmap,
                    input->block_bitmap - start);
@@ -247,6 +249,9 @@ static int setup_new_group_blocks(struct super_block *sb,
         err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group, GFP_NOFS);
         if (err)
                 goto exit_bh;
+        for (i = 0, bit = input->inode_table - start;
+             i < sbi->s_itb_per_group; i++, bit++)
+                ext4_set_bit(bit, bh->b_data);
 
         if ((err = extend_or_restart_transaction(handle, 2, bh)))
                 goto exit_bh;
diff --git a/fs/logfs/journal.c b/fs/logfs/journal.c
index f46ee8b0e13..9da29706f91 100644
--- a/fs/logfs/journal.c
+++ b/fs/logfs/journal.c
@@ -828,7 +828,7 @@ void do_logfs_journal_wl_pass(struct super_block *sb)
                 super->s_journal_seg[i] = segno;
                 super->s_journal_ec[i] = ec;
                 logfs_set_segment_reserved(sb, segno);
-                err = btree_insert32(head, segno, (void *)1, GFP_KERNEL);
+                err = btree_insert32(head, segno, (void *)1, GFP_NOFS);
                 BUG_ON(err); /* mempool should prevent this */
                 err = logfs_erase_segment(sb, segno, 1);
                 BUG_ON(err); /* FIXME: remount-ro would be nicer */
diff --git a/fs/logfs/readwrite.c b/fs/logfs/readwrite.c
index 6127baf0e18..ee99a9f5dfd 100644
--- a/fs/logfs/readwrite.c
+++ b/fs/logfs/readwrite.c
@@ -1994,6 +1994,9 @@ static int do_write_inode(struct inode *inode)
 
         /* FIXME: transaction is part of logfs_block now.  Is that enough? */
         err = logfs_write_buf(master_inode, page, 0);
+        if (err)
+                move_page_to_inode(inode, page);
+
         logfs_put_write_page(page);
         return err;
 }
diff --git a/fs/namei.c b/fs/namei.c
index 5362af9b737..4ff7ca53053 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1748,6 +1748,9 @@ struct file *do_filp_open(int dfd, const char *pathname,
         if (!(open_flag & O_CREAT))
                 mode = 0;
 
+        /* Must never be set by userspace */
+        open_flag &= ~FMODE_NONOTIFY;
+
         /*
          * O_SYNC is implemented as __O_SYNC|O_DSYNC.  As many places only
          * check for O_DSYNC if the need any syncing at all we enforce it's
diff --git a/fs/nilfs2/gcinode.c b/fs/nilfs2/gcinode.c
index 33ad25ddd5c..caf9a6a3fb5 100644
--- a/fs/nilfs2/gcinode.c
+++ b/fs/nilfs2/gcinode.c
@@ -176,7 +176,6 @@ int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *bh)
 int nilfs_init_gcinode(struct inode *inode)
 {
         struct nilfs_inode_info *ii = NILFS_I(inode);
-        struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
 
         inode->i_mode = S_IFREG;
         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
@@ -186,14 +185,6 @@ int nilfs_init_gcinode(struct inode *inode)
         ii->i_flags = 0;
         nilfs_bmap_init_gc(ii->i_bmap);
 
-        /*
-         * Add the inode to GC inode list. Garbage Collection
-         * is serialized and no two processes manipulate the
-         * list simultaneously.
-         */
-        igrab(inode);
-        list_add(&NILFS_I(inode)->i_dirty, &nilfs->ns_gc_inodes);
-
         return 0;
 }
 
diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index e00d9457c25..b185e937a33 100644
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -337,6 +337,7 @@ static int nilfs_ioctl_move_blocks(struct super_block *sb,
                                    struct nilfs_argv *argv, void *buf)
 {
         size_t nmembs = argv->v_nmembs;
+        struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs;
         struct inode *inode;
         struct nilfs_vdesc *vdesc;
         struct buffer_head *bh, *n;
@@ -353,6 +354,17 @@ static int nilfs_ioctl_move_blocks(struct super_block *sb,
                         ret = PTR_ERR(inode);
                         goto failed;
                 }
+                if (list_empty(&NILFS_I(inode)->i_dirty)) {
+                        /*
+                         * Add the inode to GC inode list. Garbage Collection
+                         * is serialized and no two processes manipulate the
+                         * list simultaneously.
+                         */
+                        igrab(inode);
+                        list_add(&NILFS_I(inode)->i_dirty,
+                                 &nilfs->ns_gc_inodes);
+                }
+
                 do {
                         ret = nilfs_ioctl_move_inode_block(inode, vdesc,
                                                            &buffers);
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index b04f88eed09..f35794b97e8 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -92,7 +92,11 @@ static int fanotify_get_response_from_access(struct fsnotify_group *group,
 
         pr_debug("%s: group=%p event=%p\n", __func__, group, event);
 
-        wait_event(group->fanotify_data.access_waitq, event->response);
+        wait_event(group->fanotify_data.access_waitq, event->response ||
+                                atomic_read(&group->fanotify_data.bypass_perm));
+
+        if (!event->response) /* bypass_perm set */
+                return 0;
 
         /* userspace responded, convert to something usable */
         spin_lock(&event->lock);
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 063224812b7..8b61220cffc 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -106,20 +106,29 @@ static int create_fd(struct fsnotify_group *group, struct fsnotify_event *event)
         return client_fd;
 }
 
-static ssize_t fill_event_metadata(struct fsnotify_group *group,
+static int fill_event_metadata(struct fsnotify_group *group,
                                    struct fanotify_event_metadata *metadata,
                                    struct fsnotify_event *event)
 {
+        int ret = 0;
+
         pr_debug("%s: group=%p metadata=%p event=%p\n", __func__,
                  group, metadata, event);
 
         metadata->event_len = FAN_EVENT_METADATA_LEN;
+        metadata->metadata_len = FAN_EVENT_METADATA_LEN;
         metadata->vers = FANOTIFY_METADATA_VERSION;
         metadata->mask = event->mask & FAN_ALL_OUTGOING_EVENTS;
         metadata->pid = pid_vnr(event->tgid);
-        metadata->fd = create_fd(group, event);
+        if (unlikely(event->mask & FAN_Q_OVERFLOW))
+                metadata->fd = FAN_NOFD;
+        else {
+                metadata->fd = create_fd(group, event);
+                if (metadata->fd < 0)
+                        ret = metadata->fd;
+        }
 
-        return metadata->fd;
+        return ret;
 }
 
 #ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
@@ -200,7 +209,7 @@ static int prepare_for_access_response(struct fsnotify_group *group,
 
         mutex_lock(&group->fanotify_data.access_mutex);
 
-        if (group->fanotify_data.bypass_perm) {
+        if (atomic_read(&group->fanotify_data.bypass_perm)) {
                 mutex_unlock(&group->fanotify_data.access_mutex);
                 kmem_cache_free(fanotify_response_event_cache, re);
                 event->response = FAN_ALLOW;
@@ -257,24 +266,34 @@ static ssize_t copy_event_to_user(struct fsnotify_group *group,
 
         pr_debug("%s: group=%p event=%p\n", __func__, group, event);
 
-        fd = fill_event_metadata(group, &fanotify_event_metadata, event);
-        if (fd < 0)
-                return fd;
+        ret = fill_event_metadata(group, &fanotify_event_metadata, event);
+        if (ret < 0)
+                goto out;
 
+        fd = fanotify_event_metadata.fd;
         ret = prepare_for_access_response(group, event, fd);
         if (ret)
                 goto out_close_fd;
 
         ret = -EFAULT;
-        if (copy_to_user(buf, &fanotify_event_metadata, FAN_EVENT_METADATA_LEN))
+        if (copy_to_user(buf, &fanotify_event_metadata,
+                         fanotify_event_metadata.event_len))
                 goto out_kill_access_response;
 
-        return FAN_EVENT_METADATA_LEN;
+        return fanotify_event_metadata.event_len;
 
 out_kill_access_response:
         remove_access_response(group, event, fd);
 out_close_fd:
-        sys_close(fd);
+        if (fd != FAN_NOFD)
+                sys_close(fd);
+out:
+#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
+        if (event->mask & FAN_ALL_PERM_EVENTS) {
+                event->response = FAN_DENY;
+                wake_up(&group->fanotify_data.access_waitq);
+        }
+#endif
         return ret;
 }
 
@@ -382,7 +401,7 @@ static int fanotify_release(struct inode *ignored, struct file *file)
 
         mutex_lock(&group->fanotify_data.access_mutex);
 
-        group->fanotify_data.bypass_perm = true;
+        atomic_inc(&group->fanotify_data.bypass_perm);
 
         list_for_each_entry_safe(re, lre, &group->fanotify_data.access_list, list) {
                 pr_debug("%s: found group=%p re=%p event=%p\n", __func__, group,
@@ -586,11 +605,10 @@ static int fanotify_add_vfsmount_mark(struct fsnotify_group *group,
 {
         struct fsnotify_mark *fsn_mark;
         __u32 added;
+        int ret = 0;
 
         fsn_mark = fsnotify_find_vfsmount_mark(group, mnt);
         if (!fsn_mark) {
-                int ret;
-
                 if (atomic_read(&group->num_marks) > group->fanotify_data.max_marks)
                         return -ENOSPC;
 
@@ -600,17 +618,16 @@ static int fanotify_add_vfsmount_mark(struct fsnotify_group *group,
 
                 fsnotify_init_mark(fsn_mark, fanotify_free_mark);
                 ret = fsnotify_add_mark(fsn_mark, group, NULL, mnt, 0);
-                if (ret) {
-                        fanotify_free_mark(fsn_mark);
-                        return ret;
-                }
+                if (ret)
+                        goto err;
         }
         added = fanotify_mark_add_to_mask(fsn_mark, mask, flags);
-        fsnotify_put_mark(fsn_mark);
+
         if (added & ~mnt->mnt_fsnotify_mask)
                 fsnotify_recalc_vfsmount_mask(mnt);
-
-        return 0;
+err:
+        fsnotify_put_mark(fsn_mark);
+        return ret;
 }
 
 static int fanotify_add_inode_mark(struct fsnotify_group *group,
@@ -619,6 +636,7 @@ static int fanotify_add_inode_mark(struct fsnotify_group *group,
 {
         struct fsnotify_mark *fsn_mark;
         __u32 added;
+        int ret = 0;
 
         pr_debug("%s: group=%p inode=%p\n", __func__, group, inode);
 
@@ -634,8 +652,6 @@ static int fanotify_add_inode_mark(struct fsnotify_group *group,
 
         fsn_mark = fsnotify_find_inode_mark(group, inode);
         if (!fsn_mark) {
-                int ret;
-
                 if (atomic_read(&group->num_marks) > group->fanotify_data.max_marks)
                         return -ENOSPC;
 
@@ -645,16 +661,16 @@ static int fanotify_add_inode_mark(struct fsnotify_group *group,
 
                 fsnotify_init_mark(fsn_mark, fanotify_free_mark);
                 ret = fsnotify_add_mark(fsn_mark, group, inode, NULL, 0);
-                if (ret) {
-                        fanotify_free_mark(fsn_mark);
-                        return ret;
-                }
+                if (ret)
+                        goto err;
         }
         added = fanotify_mark_add_to_mask(fsn_mark, mask, flags);
-        fsnotify_put_mark(fsn_mark);
+
         if (added & ~inode->i_fsnotify_mask)
                 fsnotify_recalc_inode_mask(inode);
-        return 0;
+err:
+        fsnotify_put_mark(fsn_mark);
+        return ret;
 }
 
 /* fanotify syscalls */
@@ -687,8 +703,10 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
 
         /* fsnotify_alloc_group takes a ref.  Dropped in fanotify_release */
         group = fsnotify_alloc_group(&fanotify_fsnotify_ops);
-        if (IS_ERR(group))
+        if (IS_ERR(group)) {
+                free_uid(user);
                 return PTR_ERR(group);
+        }
 
         group->fanotify_data.user = user;
         atomic_inc(&user->fanotify_listeners);
@@ -698,6 +716,7 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
         mutex_init(&group->fanotify_data.access_mutex);
         init_waitqueue_head(&group->fanotify_data.access_waitq);
         INIT_LIST_HEAD(&group->fanotify_data.access_list);
+        atomic_set(&group->fanotify_data.bypass_perm, 0);
 #endif
         switch (flags & FAN_ALL_CLASS_BITS) {
         case FAN_CLASS_NOTIF:
@@ -764,8 +783,10 @@ SYSCALL_DEFINE(fanotify_mark)(int fanotify_fd, unsigned int flags,
         if (flags & ~FAN_ALL_MARK_FLAGS)
                 return -EINVAL;
         switch (flags & (FAN_MARK_ADD | FAN_MARK_REMOVE | FAN_MARK_FLUSH)) {
-        case FAN_MARK_ADD:
+        case FAN_MARK_ADD:              /* fallthrough */
         case FAN_MARK_REMOVE:
+                if (!mask)
+                        return -EINVAL;
         case FAN_MARK_FLUSH:
                 break;
         default:
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index 444c305a468..4cd5d5d78f9 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -752,6 +752,7 @@ SYSCALL_DEFINE1(inotify_init1, int, flags)
         if (ret >= 0)
                 return ret;
 
+        fsnotify_put_group(group);
         atomic_dec(&user->inotify_devs);
 out_free_uid:
         free_uid(user);
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index f1e962cb3b7..0d7c5540ad6 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -573,11 +573,14 @@ static void ocfs2_dio_end_io(struct kiocb *iocb,
         /* this io's submitter should not have unlocked this before we could */
         BUG_ON(!ocfs2_iocb_is_rw_locked(iocb));
 
+        if (ocfs2_iocb_is_sem_locked(iocb)) {
+                up_read(&inode->i_alloc_sem);
+                ocfs2_iocb_clear_sem_locked(iocb);
+        }
+
         ocfs2_iocb_clear_rw_locked(iocb);
 
         level = ocfs2_iocb_rw_locked_level(iocb);
-        if (!level)
-                up_read(&inode->i_alloc_sem);
         ocfs2_rw_unlock(inode, level);
 
         if (is_async)
diff --git a/fs/ocfs2/aops.h b/fs/ocfs2/aops.h
index 76bfdfda691..eceb456037c 100644
--- a/fs/ocfs2/aops.h
+++ b/fs/ocfs2/aops.h
@@ -68,8 +68,27 @@ static inline void ocfs2_iocb_set_rw_locked(struct kiocb *iocb, int level)
         else
                 clear_bit(1, (unsigned long *)&iocb->private);
 }
+
+/*
+ * Using a named enum representing lock types in terms of #N bit stored in
+ * iocb->private, which is going to be used for communication bewteen
+ * ocfs2_dio_end_io() and ocfs2_file_aio_write/read().
+ */
+enum ocfs2_iocb_lock_bits {
+        OCFS2_IOCB_RW_LOCK = 0,
+        OCFS2_IOCB_RW_LOCK_LEVEL,
+        OCFS2_IOCB_SEM,
+        OCFS2_IOCB_NUM_LOCKS
+};
+
 #define ocfs2_iocb_clear_rw_locked(iocb) \
-        clear_bit(0, (unsigned long *)&iocb->private)
+        clear_bit(OCFS2_IOCB_RW_LOCK, (unsigned long *)&iocb->private)
 #define ocfs2_iocb_rw_locked_level(iocb) \
-        test_bit(1, (unsigned long *)&iocb->private)
+        test_bit(OCFS2_IOCB_RW_LOCK_LEVEL, (unsigned long *)&iocb->private)
+#define ocfs2_iocb_set_sem_locked(iocb) \
+        set_bit(OCFS2_IOCB_SEM, (unsigned long *)&iocb->private)
+#define ocfs2_iocb_clear_sem_locked(iocb) \
+        clear_bit(OCFS2_IOCB_SEM, (unsigned long *)&iocb->private)
+#define ocfs2_iocb_is_sem_locked(iocb) \
+        test_bit(OCFS2_IOCB_SEM, (unsigned long *)&iocb->private)
 #endif /* OCFS2_FILE_H */
diff --git a/fs/ocfs2/cluster/masklog.c b/fs/ocfs2/cluster/masklog.c
index c7fba396392..6c61771469a 100644
--- a/fs/ocfs2/cluster/masklog.c
+++ b/fs/ocfs2/cluster/masklog.c
@@ -113,10 +113,11 @@ static struct mlog_attribute mlog_attrs[MLOG_MAX_BITS] = {
         define_mask(QUOTA),
         define_mask(REFCOUNT),
         define_mask(BASTS),
+        define_mask(RESERVATIONS),
+        define_mask(CLUSTER),
         define_mask(ERROR),
         define_mask(NOTICE),
         define_mask(KTHREAD),
-        define_mask(RESERVATIONS),
 };
 
 static struct attribute *mlog_attr_ptrs[MLOG_MAX_BITS] = {NULL, };
diff --git a/fs/ocfs2/cluster/masklog.h b/fs/ocfs2/cluster/masklog.h
index ea2ed9f56c9..34d6544357d 100644
--- a/fs/ocfs2/cluster/masklog.h
+++ b/fs/ocfs2/cluster/masklog.h
@@ -81,7 +81,7 @@
 #include <linux/sched.h>
 
 /* bits that are frequently given and infrequently matched in the low word */
-/* NOTE: If you add a flag, you need to also update mlog.c! */
+/* NOTE: If you add a flag, you need to also update masklog.c! */
 #define ML_ENTRY        0x0000000000000001ULL /* func call entry */
 #define ML_EXIT         0x0000000000000002ULL /* func call exit */
 #define ML_TCP          0x0000000000000004ULL /* net cluster/tcp.c */
@@ -114,13 +114,14 @@
 #define ML_XATTR        0x0000000020000000ULL /* ocfs2 extended attributes */
 #define ML_QUOTA        0x0000000040000000ULL /* ocfs2 quota operations */
 #define ML_REFCOUNT     0x0000000080000000ULL /* refcount tree operations */
-#define ML_BASTS        0x0000001000000000ULL /* dlmglue asts and basts */
+#define ML_BASTS        0x0000000100000000ULL /* dlmglue asts and basts */
+#define ML_RESERVATIONS 0x0000000200000000ULL /* ocfs2 alloc reservations */
+#define ML_CLUSTER      0x0000000400000000ULL /* cluster stack */
+
 /* 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 */
-#define ML_KTHREAD      0x0000000400000000ULL /* kernel thread activity */
-#define ML_RESERVATIONS 0x0000000800000000ULL /* ocfs2 alloc reservations */
-#define ML_CLUSTER      0x0000001000000000ULL /* cluster stack */
+#define ML_ERROR        0x1000000000000000ULL /* sent to KERN_ERR */
+#define ML_NOTICE       0x2000000000000000ULL /* setn to KERN_NOTICE */
+#define ML_KTHREAD      0x4000000000000000ULL /* kernel thread activity */
 
 #define MLOG_INITIAL_AND_MASK (ML_ERROR|ML_NOTICE)
 #define MLOG_INITIAL_NOT_MASK (ML_ENTRY|ML_EXIT)
diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c
index c49f6de0e7a..d417b3f9b0c 100644
--- a/fs/ocfs2/dir.c
+++ b/fs/ocfs2/dir.c
@@ -2461,8 +2461,10 @@ static int ocfs2_dx_dir_attach_index(struct ocfs2_super *osb,
 
         di->i_dx_root = cpu_to_le64(dr_blkno);
 
+        spin_lock(&OCFS2_I(dir)->ip_lock);
         OCFS2_I(dir)->ip_dyn_features |= OCFS2_INDEXED_DIR_FL;
         di->i_dyn_features = cpu_to_le16(OCFS2_I(dir)->ip_dyn_features);
+        spin_unlock(&OCFS2_I(dir)->ip_lock);
 
         ocfs2_journal_dirty(handle, di_bh);
 
@@ -4466,8 +4468,10 @@ static int ocfs2_dx_dir_remove_index(struct inode *dir,
                 goto out_commit;
         }
 
+        spin_lock(&OCFS2_I(dir)->ip_lock);
         OCFS2_I(dir)->ip_dyn_features &= ~OCFS2_INDEXED_DIR_FL;
         di->i_dyn_features = cpu_to_le16(OCFS2_I(dir)->ip_dyn_features);
+        spin_unlock(&OCFS2_I(dir)->ip_lock);
         di->i_dx_root = cpu_to_le64(0ULL);
 
         ocfs2_journal_dirty(handle, di_bh);
diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
index f564b0e5f80..59f0f6bdfc6 100644
--- a/fs/ocfs2/dlm/dlmmaster.c
+++ b/fs/ocfs2/dlm/dlmmaster.c
@@ -2346,7 +2346,8 @@ static void dlm_deref_lockres_worker(struct dlm_work_item *item, void *data)
  */
 static int dlm_is_lockres_migrateable(struct dlm_ctxt *dlm,
                                       struct dlm_lock_resource *res,
-                                      int *numlocks)
+                                      int *numlocks,
+                                      int *hasrefs)
 {
         int ret;
         int i;
@@ -2356,6 +2357,9 @@ static int dlm_is_lockres_migrateable(struct dlm_ctxt *dlm,
 
         assert_spin_locked(&res->spinlock);
 
+        *numlocks = 0;
+        *hasrefs = 0;
+
         ret = -EINVAL;
         if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN) {
                 mlog(0, "cannot migrate lockres with unknown owner!\n");
@@ -2386,7 +2390,13 @@ static int dlm_is_lockres_migrateable(struct dlm_ctxt *dlm,
         }
 
         *numlocks = count;
-        mlog(0, "migrateable lockres having %d locks\n", *numlocks);
+
+        count = find_next_bit(res->refmap, O2NM_MAX_NODES, 0);
+        if (count < O2NM_MAX_NODES)
+                *hasrefs = 1;
+
+        mlog(0, "%s: res %.*s, Migrateable, locks %d, refs %d\n", dlm->name,
+             res->lockname.len, res->lockname.name, *numlocks, *hasrefs);
 
 leave:
         return ret;
@@ -2408,7 +2418,7 @@ static int dlm_migrate_lockres(struct dlm_ctxt *dlm,
         const char *name;
         unsigned int namelen;
         int mle_added = 0;
-        int numlocks;
+        int numlocks, hasrefs;
         int wake = 0;
 
         if (!dlm_grab(dlm))
@@ -2417,13 +2427,13 @@ static int dlm_migrate_lockres(struct dlm_ctxt *dlm,
         name = res->lockname.name;
         namelen = res->lockname.len;
 
-        mlog(0, "migrating %.*s to %u\n", namelen, name, target);
+        mlog(0, "%s: Migrating %.*s to %u\n", dlm->name, namelen, name, target);
 
         /*
          * ensure this lockres is a proper candidate for migration
          */
         spin_lock(&res->spinlock);
-        ret = dlm_is_lockres_migrateable(dlm, res, &numlocks);
+        ret = dlm_is_lockres_migrateable(dlm, res, &numlocks, &hasrefs);
         if (ret < 0) {
                 spin_unlock(&res->spinlock);
                 goto leave;
@@ -2431,10 +2441,8 @@ static int dlm_migrate_lockres(struct dlm_ctxt *dlm,
         spin_unlock(&res->spinlock);
 
         /* no work to do */
-        if (numlocks == 0) {
-                mlog(0, "no locks were found on this lockres! done!\n");
+        if (numlocks == 0 && !hasrefs)
                 goto leave;
-        }
 
         /*
          * preallocate up front
@@ -2459,14 +2467,14 @@ static int dlm_migrate_lockres(struct dlm_ctxt *dlm,
          * find a node to migrate the lockres to
          */
 
-        mlog(0, "picking a migration node\n");
         spin_lock(&dlm->spinlock);
         /* pick a new node */
         if (!test_bit(target, dlm->domain_map) ||
             target >= O2NM_MAX_NODES) {
                 target = dlm_pick_migration_target(dlm, res);
         }
-        mlog(0, "node %u chosen for migration\n", target);
+        mlog(0, "%s: res %.*s, Node %u chosen for migration\n", dlm->name,
+             namelen, name, target);
 
         if (target >= O2NM_MAX_NODES ||
             !test_bit(target, dlm->domain_map)) {
@@ -2667,7 +2675,7 @@ int dlm_empty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
 {
         int ret;
         int lock_dropped = 0;
-        int numlocks;
+        int numlocks, hasrefs;
 
         spin_lock(&res->spinlock);
         if (res->owner != dlm->node_num) {
@@ -2681,8 +2689,8 @@ int dlm_empty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
         }
 
         /* No need to migrate a lockres having no locks */
-        ret = dlm_is_lockres_migrateable(dlm, res, &numlocks);
-        if (ret >= 0 && numlocks == 0) {
+        ret = dlm_is_lockres_migrateable(dlm, res, &numlocks, &hasrefs);
+        if (ret >= 0 && numlocks == 0 && !hasrefs) {
                 spin_unlock(&res->spinlock);
                 goto leave;
         }
@@ -2915,6 +2923,12 @@ static u8 dlm_pick_migration_target(struct dlm_ctxt *dlm,
                 }
                 queue++;
         }
+
+        nodenum = find_next_bit(res->refmap, O2NM_MAX_NODES, 0);
+        if (nodenum < O2NM_MAX_NODES) {
+                spin_unlock(&res->spinlock);
+                return nodenum;
+        }
         spin_unlock(&res->spinlock);
         mlog(0, "have not found a suitable target yet! checking domain map\n");
 
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 77b4c04a280..f6cba566429 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -2241,11 +2241,15 @@ static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
 
         mutex_lock(&inode->i_mutex);
 
+        ocfs2_iocb_clear_sem_locked(iocb);
+
 relock:
         /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
         if (direct_io) {
                 down_read(&inode->i_alloc_sem);
                 have_alloc_sem = 1;
+                /* communicate with ocfs2_dio_end_io */
+                ocfs2_iocb_set_sem_locked(iocb);
         }
 
         /*
@@ -2382,8 +2386,10 @@ out:
                 ocfs2_rw_unlock(inode, rw_level);
 
 out_sems:
-        if (have_alloc_sem)
+        if (have_alloc_sem) {
                 up_read(&inode->i_alloc_sem);
+                ocfs2_iocb_clear_sem_locked(iocb);
+        }
 
         mutex_unlock(&inode->i_mutex);
 
@@ -2527,6 +2533,8 @@ static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
                 goto bail;
         }
 
+        ocfs2_iocb_clear_sem_locked(iocb);
+
         /*
          * buffered reads protect themselves in ->readpage().  O_DIRECT reads
          * need locks to protect pending reads from racing with truncate.
@@ -2534,6 +2542,7 @@ static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
         if (filp->f_flags & O_DIRECT) {
                 down_read(&inode->i_alloc_sem);
                 have_alloc_sem = 1;
+                ocfs2_iocb_set_sem_locked(iocb);
 
                 ret = ocfs2_rw_lock(inode, 0);
                 if (ret < 0) {
@@ -2575,8 +2584,10 @@ static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
         }
 
 bail:
-        if (have_alloc_sem)
+        if (have_alloc_sem) {
                 up_read(&inode->i_alloc_sem);
+                ocfs2_iocb_clear_sem_locked(iocb);
+        }
         if (rw_level != -1)
                 ocfs2_rw_unlock(inode, rw_level);
         mlog_exit(ret);
diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h
index c2e4f8222e2..bf2e7764920 100644
--- a/fs/ocfs2/ocfs2_fs.h
+++ b/fs/ocfs2/ocfs2_fs.h
@@ -350,7 +350,7 @@ enum {
 #define OCFS2_LAST_LOCAL_SYSTEM_INODE LOCAL_GROUP_QUOTA_SYSTEM_INODE
         NUM_SYSTEM_INODES
 };
-#define NUM_GLOBAL_SYSTEM_INODES OCFS2_LAST_GLOBAL_SYSTEM_INODE
+#define NUM_GLOBAL_SYSTEM_INODES OCFS2_FIRST_LOCAL_SYSTEM_INODE
 #define NUM_LOCAL_SYSTEM_INODES \
                 (NUM_SYSTEM_INODES - OCFS2_FIRST_LOCAL_SYSTEM_INODE)