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>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index ee5d29a..6fe5a95 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -717,7 +717,6 @@
 
 	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_submit_bio_start(void *private_data, struct bio *bio,
-					     int mirror_num, unsigned long bio_flags,
 					     u64 bio_offset)
 {
 	/*
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index bbfae2a..6596b69 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -97,8 +97,7 @@
 				       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,
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index fc5b7d8..08ae944 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1942,7 +1942,6 @@
  * 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 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;