1 files changed, 2 insertions, 0 deletions

diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 86f859b87a6e..283110ec4ee0 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -128,6 +128,8 @@ int try_release_extent_state(struct extent_map_tree *map,
                              gfp_t mask);
 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
+int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
+                    gfp_t mask);
 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
                           get_extent_t *get_extent);
 int __init extent_io_init(void);