305 	if (cgroup_subsys_on_dfl(io_cgrp_subsys) && !blkg->parent)  in tg_bps_limit()
335 	if (cgroup_subsys_on_dfl(io_cgrp_subsys) && !blkg->parent)  in tg_iops_limit()
560 	if (cgroup_subsys_on_dfl(io_cgrp_subsys) && blkg->parent)  in throtl_pd_init()
561 		sq->parent_sq = &blkg_to_tg(blkg->parent)->service_queue;  in throtl_pd_init()
675 	struct rb_node *parent = NULL;  in tg_service_queue_add()  local
681 		parent = *node;  in tg_service_queue_add()
682 		__tg = rb_entry_tg(parent);  in tg_service_queue_add()
685 			node = &parent->rb_left;  in tg_service_queue_add()
687 			node = &parent->rb_right;  in tg_service_queue_add()
692 	rb_link_node(&tg->rb_node, parent, node);  in tg_service_queue_add()
1427 		if (!cgroup_subsys_on_dfl(io_cgrp_subsys) || !blkg->parent ||  in tg_conf_updated()
1428 		    !blkg->parent->parent)  in tg_conf_updated()
1430 		parent_tg = blkg_to_tg(blkg->parent);  in tg_conf_updated()
1817 	struct throtl_grp *parent = tg;  in tg_last_low_overflow_time()  local
1821 		parent_sq = parent->service_queue.parent_sq;  in tg_last_low_overflow_time()
1822 		parent = sq_to_tg(parent_sq);  in tg_last_low_overflow_time()
1823 		if (!parent)  in tg_last_low_overflow_time()
1830 		if (!parent->bps[READ][LIMIT_LOW] &&  in tg_last_low_overflow_time()
1831 		    !parent->iops[READ][LIMIT_LOW] &&  in tg_last_low_overflow_time()
1832 		    !parent->bps[WRITE][LIMIT_LOW] &&  in tg_last_low_overflow_time()
1833 		    !parent->iops[WRITE][LIMIT_LOW])  in tg_last_low_overflow_time()
1835 		if (time_after(__tg_last_low_overflow_time(parent), ret))  in tg_last_low_overflow_time()
1836 			ret = __tg_last_low_overflow_time(parent);  in tg_last_low_overflow_time()
1900 		if (!tg || !tg_to_blkg(tg)->parent)  in throtl_hierarchy_can_upgrade()
2017 		if (!tg || !tg_to_blkg(tg)->parent)  in throtl_hierarchy_can_downgrade()
2189 	struct throtl_grp *parent = blkg_to_tg(blkg);  in blk_throtl_charge_bio_split()  local
2194 		if (!parent->has_rules[rw])  in blk_throtl_charge_bio_split()
2197 		atomic_inc(&parent->io_split_cnt[rw]);  in blk_throtl_charge_bio_split()
2198 		atomic_inc(&parent->last_io_split_cnt[rw]);  in blk_throtl_charge_bio_split()
2200 		parent_sq = parent->service_queue.parent_sq;  in blk_throtl_charge_bio_split()
2201 		parent = sq_to_tg(parent_sq);  in blk_throtl_charge_bio_split()
2202 	} while (parent);  in blk_throtl_charge_bio_split()