tdev_to_ldev
struct lsdc_device *ldev = tdev_to_ldev(bdev);
struct lsdc_device *ldev = tdev_to_ldev(tbo->bdev);
struct lsdc_device *ldev = tdev_to_ldev(tbo->bdev);
struct lsdc_device *ldev = tdev_to_ldev(tbo->bdev);