diff --git a/fs/btrfs/locking.h b/fs/btrfs/locking.h
index 2dab96d..bc1faef 100644
--- a/fs/btrfs/locking.h
+++ b/fs/btrfs/locking.h
@@ -23,4 +23,5 @@
 int btrfs_tree_unlock(struct extent_buffer *eb);
 int btrfs_tree_locked(struct extent_buffer *eb);
 int btrfs_try_tree_lock(struct extent_buffer *eb);
+int btrfs_path_lock_waiting(struct btrfs_path *path, int level);
 #endif