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/extent_io.h b/fs/btrfs/extent_io.h
index 1f8478dc9f8e..3e4fad4a909d 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -103,6 +103,7 @@ struct extent_io_ops {
         int (*merge_bio_hook)(struct page *page, unsigned long offset,
                               size_t size, struct bio *bio,
                               unsigned long bio_flags);
+        int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
 
         /*
          * Optional hooks, called if the pointer is not NULL
@@ -110,7 +111,6 @@ struct extent_io_ops {
         int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
                              u64 start, u64 end, int *page_started,
                              unsigned long *nr_written);
-        int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
 
         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
         void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,