Btrfs: Add a per-inode csum mutex to avoid races creating csum items

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index 5ba83894c8b7..40b4e0c9cd09 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -30,6 +30,7 @@ struct btrfs_inode {
         struct extent_map_tree extent_tree;
         struct extent_io_tree io_tree;
         struct extent_io_tree io_failure_tree;
+        struct mutex csum_mutex;
         struct inode vfs_inode;
         atomic_t ordered_writeback;