btrfs: remove unused btrfs_map_block

There are no users of btrfs_map_block left, so remove it.
Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/volumes.c

@@ -6481,14 +6481,6 @@ int __btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
 	return ret;
 }
 
-int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
-		      u64 logical, u64 *length,
-		      struct btrfs_io_context **bioc_ret, int mirror_num)
-{
-	return __btrfs_map_block(fs_info, op, logical, length, bioc_ret,
-				 NULL, &mirror_num, 0);
-}
-
 /* For Scrub/replace */
 int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
 		     u64 logical, u64 *length,

fs/btrfs/volumes.h

@@ -582,9 +582,6 @@ static inline unsigned long btrfs_chunk_item_size(int num_stripes)
 
 void btrfs_get_bioc(struct btrfs_io_context *bioc);
 void btrfs_put_bioc(struct btrfs_io_context *bioc);
-int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
-		    u64 logical, u64 *length,
-		    struct btrfs_io_context **bioc_ret, int mirror_num);
 int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
 		     u64 logical, u64 *length,
 		     struct btrfs_io_context **bioc_ret);