struct block_device *bdget_disk(struct gendisk *disk, int partno)
{
	struct hd_struct *part;
	struct block_device *bdev = NULL;

	part = disk_get_part(disk, partno);
	if (part)
		bdev = bdget(part_devt(part));
	disk_put_part(part);

	return bdev;
}
Unknown