btrfs: add dummy callback for readpage_io_failed and drop checks

Make extent_io_ops::readpage_io_failed_hook callback mandatory and
define a dummy function for btrfs_extent_io_ops. As the failed IO
callback is not performance critical, the branch vs extra trade off does
not hurt.

Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 60d4f1b210d7..cad47ece2fdf 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -4658,7 +4658,7 @@ static const struct extent_io_ops btree_extent_io_ops = {
         .readpage_end_io_hook = btree_readpage_end_io_hook,
         /* note we're sharing with inode.c for the merge bio hook */
         .merge_bio_hook = btrfs_merge_bio_hook,
+        .readpage_io_failed_hook = btree_io_failed_hook,
 
         /* optional callbacks */
-        .readpage_io_failed_hook = btree_io_failed_hook,
 };