btrfs: remove unused parameters from extent_submit_bio_start_t

Remove parameters not used by any of the callbacks.
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/disk-io.c

@@ -717,7 +717,6 @@ static void run_one_async_start(struct btrfs_work *work)
 
 	async = container_of(work, struct  async_submit_bio, work);
 	ret = async->submit_bio_start(async->private_data, async->bio,
-				      async->mirror_num, async->bio_flags,
 				      async->bio_offset);
 	if (ret)
 		async->status = ret;
@@ -800,7 +799,6 @@ static blk_status_t btree_csum_one_bio(struct bio *bio)
 }
 
 static blk_status_t __btree_submit_bio_start(void *private_data, struct bio *bio,
-					     int mirror_num, unsigned long bio_flags,
 					     u64 bio_offset)
 {
 	/*

fs/btrfs/extent_io.h

@@ -97,8 +97,7 @@ typedef	blk_status_t (extent_submit_bio_hook_t)(void *private_data, struct bio *
 				       u64 bio_offset);
 
 typedef blk_status_t (extent_submit_bio_start_t)(void *private_data,
-		struct bio *bio, int mirror_num, unsigned long bio_flags,
-		u64 bio_offset);
+		struct bio *bio, u64 bio_offset);
 
 typedef blk_status_t (extent_submit_bio_done_t)(void *private_data,
 		struct bio *bio, int mirror_num, unsigned long bio_flags,

fs/btrfs/inode.c

@@ -1942,7 +1942,6 @@ int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
  * are inserted into the btree
  */
 static blk_status_t __btrfs_submit_bio_start(void *private_data, struct bio *bio,
-				    int mirror_num, unsigned long bio_flags,
 				    u64 bio_offset)
 {
 	struct inode *inode = private_data;
@@ -8222,8 +8221,7 @@ static void btrfs_endio_direct_write(struct bio *bio)
 }
 
 static blk_status_t __btrfs_submit_bio_start_direct_io(void *private_data,
-				    struct bio *bio, int mirror_num,
-				    unsigned long bio_flags, u64 offset)
+				    struct bio *bio, u64 offset)
 {
 	struct inode *inode = private_data;
 	blk_status_t ret;