struct btrfs_io_bio;
 struct io_failure_record;
 
-typedef        blk_status_t (extent_submit_bio_hook_t)(void *private_data, struct bio *bio,
-                                      int mirror_num, unsigned long bio_flags,
-                                      u64 bio_offset);
 
 typedef blk_status_t (extent_submit_bio_start_t)(void *private_data,
                struct bio *bio, u64 bio_offset);
         * The following callbacks must be always defined, the function
         * pointer will be called unconditionally.
         */
-       extent_submit_bio_hook_t *submit_bio_hook;
+       blk_status_t (*submit_bio_hook)(void *private_data, struct bio *bio,
+                                       int mirror_num, unsigned long bio_flags,
+                                       u64 bio_offset);
        int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
                                    struct page *page, u64 start, u64 end,
                                    int mirror);