1 files changed, 2 insertions, 0 deletions

diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 0dca89328f98..8b5319db2516 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -29,6 +29,8 @@ struct extent_io_ops {
         int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
         int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
         int (*submit_bio_hook)(struct inode *inode, int rw, struct bio *bio);
+        int (*merge_bio_hook)(struct page *page, unsigned long offset,
+                              size_t size, struct bio *bio);
         int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
         int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
                                     struct extent_state *state);