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authorChris Mason <chris.mason@oracle.com>2012-05-03 12:08:48 -0400
committerChris Mason <chris.mason@oracle.com>2012-05-04 15:14:11 -0400
commite5846fc665d1c3dd32d877febe7402ccd583b8a1 (patch)
tree162d4487dd5cb573036507821d92d5c0c559d56b /fs
parentdc7fdde39e4962b1a88741f7eba2a6b3be1285d8 (diff)
downloadlinux-linaro-stable-e5846fc665d1c3dd32d877febe7402ccd583b8a1.tar.gz
Btrfs: Add properly locking around add_root_to_dirty_list
add_root_to_dirty_list happens once at the very beginning of the transaction, but it is still racey. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/ctree.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index e801f226d7e0..086303b9be64 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -220,10 +220,12 @@ struct extent_buffer *btrfs_read_lock_root_node(struct btrfs_root *root)
*/
static void add_root_to_dirty_list(struct btrfs_root *root)
{
+ spin_lock(&root->fs_info->trans_lock);
if (root->track_dirty && list_empty(&root->dirty_list)) {
list_add(&root->dirty_list,
&root->fs_info->dirty_cowonly_roots);
}
+ spin_unlock(&root->fs_info->trans_lock);
}
/*