blkcg_schedule_throttle
blkcg_schedule_throttle(rqos->disk,
blkcg_schedule_throttle(rqos->disk,
blkcg_schedule_throttle(rqos->disk, use_memdelay);
void blkcg_schedule_throttle(struct gendisk *disk, bool use_memdelay);
blkcg_schedule_throttle(si->bdev->bd_disk, true);