nbd: Use set_blocksize() to set device blocksize

commit c8a83a6b upstream.

NBD can update block device block size implicitely through
bd_set_size(). Make it explicitely set blocksize with set_blocksize() as
this behavior of bd_set_size() is going away.

CC: Josef Bacik <jbacik@fb.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/block/nbd.c

@@ -120,6 +120,7 @@ static void nbd_size_update(struct nbd_device *nbd, struct block_device *bdev)
 	blk_queue_logical_block_size(nbd->disk->queue, nbd->blksize);
 	blk_queue_physical_block_size(nbd->disk->queue, nbd->blksize);
 	bd_set_size(bdev, nbd->bytesize);
+	set_blocksize(bdev, nbd->blksize);
 	set_capacity(nbd->disk, nbd->bytesize >> 9);
 	kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE);
 }