47 struct blkcg blkcg_root;
95 	css_put(&blkg->blkcg->css);  in __blkg_release()
150 static struct blkcg_gq *blkg_alloc(struct blkcg *blkcg, struct request_queue *q,  in blkg_alloc()  argument
173 	blkg->blkcg = blkcg;  in blkg_alloc()
187 		pd = pol->pd_alloc_fn(gfp_mask, q, blkcg);  in blkg_alloc()
203 struct blkcg_gq *blkg_lookup_slowpath(struct blkcg *blkcg,  in blkg_lookup_slowpath()  argument
214 	blkg = radix_tree_lookup(&blkcg->blkg_tree, q->id);  in blkg_lookup_slowpath()
218 			rcu_assign_pointer(blkcg->blkg_hint, blkg);  in blkg_lookup_slowpath()
231 static struct blkcg_gq *blkg_create(struct blkcg *blkcg,  in blkg_create()  argument
248 	if (!css_tryget_online(&blkcg->css)) {  in blkg_create()
255 		new_blkg = blkg_alloc(blkcg, q, GFP_NOWAIT | __GFP_NOWARN);  in blkg_create()
264 	if (blkcg_parent(blkcg)) {  in blkg_create()
265 		blkg->parent = __blkg_lookup(blkcg_parent(blkcg), q, false);  in blkg_create()
282 	spin_lock(&blkcg->lock);  in blkg_create()
283 	ret = radix_tree_insert(&blkcg->blkg_tree, q->id, blkg);  in blkg_create()
285 		hlist_add_head_rcu(&blkg->blkcg_node, &blkcg->blkg_list);  in blkg_create()
296 	spin_unlock(&blkcg->lock);  in blkg_create()
306 	css_put(&blkcg->css);  in blkg_create()
325 static struct blkcg_gq *blkg_lookup_create(struct blkcg *blkcg,  in blkg_lookup_create()  argument
333 	blkg = blkg_lookup(blkcg, q);  in blkg_lookup_create()
338 	blkg = __blkg_lookup(blkcg, q, true);  in blkg_lookup_create()
348 		struct blkcg *pos = blkcg;  in blkg_lookup_create()
349 		struct blkcg *parent = blkcg_parent(blkcg);  in blkg_lookup_create()
368 		if (pos == blkcg)  in blkg_lookup_create()
379 	struct blkcg *blkcg = blkg->blkcg;  in blkg_destroy()  local
383 	lockdep_assert_held(&blkcg->lock);  in blkg_destroy()
398 	radix_tree_delete(&blkcg->blkg_tree, blkg->q->id);  in blkg_destroy()
407 	if (rcu_access_pointer(blkcg->blkg_hint) == blkg)  in blkg_destroy()
408 		rcu_assign_pointer(blkcg->blkg_hint, NULL);  in blkg_destroy()
429 		struct blkcg *blkcg = blkg->blkcg;  in blkg_destroy_all()  local
431 		spin_lock(&blkcg->lock);  in blkg_destroy_all()
433 		spin_unlock(&blkcg->lock);  in blkg_destroy_all()
443 	struct blkcg *blkcg = css_to_blkcg(css);  in blkcg_reset_stats()  local
448 	spin_lock_irq(&blkcg->lock);  in blkcg_reset_stats()
455 	hlist_for_each_entry(blkg, &blkcg->blkg_list, blkcg_node) {  in blkcg_reset_stats()
471 	spin_unlock_irq(&blkcg->lock);  in blkcg_reset_stats()
502 void blkcg_print_blkgs(struct seq_file *sf, struct blkcg *blkcg,  in blkcg_print_blkgs()  argument
512 	hlist_for_each_entry_rcu(blkg, &blkcg->blkg_list, blkcg_node) {  in blkcg_print_blkgs()
546 static struct blkcg_gq *blkg_lookup_check(struct blkcg *blkcg,  in blkg_lookup_check()  argument
555 	return __blkg_lookup(blkcg, q, true /* update_hint */);  in blkg_lookup_check()
608 int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,  in blkg_conf_prep()  argument
626 	blkg = blkg_lookup_check(blkcg, pol, q);  in blkg_conf_prep()
640 		struct blkcg *pos = blkcg;  in blkg_conf_prep()
641 		struct blkcg *parent;  in blkg_conf_prep()
644 		parent = blkcg_parent(blkcg);  in blkg_conf_prep()
688 		if (pos == blkcg)  in blkg_conf_prep()
766 	struct blkcg *blkcg = css_to_blkcg(css);  in blkcg_rstat_flush()  local
771 	hlist_for_each_entry_rcu(blkg, &blkcg->blkg_list, blkcg_node) {  in blkcg_rstat_flush()
858 	struct blkcg *blkcg = css_to_blkcg(seq_css(sf));  in blkcg_print_stat()  local
864 		cgroup_rstat_flush(blkcg->css.cgroup);  in blkcg_print_stat()
868 	hlist_for_each_entry_rcu(blkg, &blkcg->blkg_list, blkcg_node) {  in blkcg_print_stat()
998 	struct blkcg *blkcg = css_to_blkcg(css);  in blkcg_css_offline()  local
1001 	wb_blkcg_offline(blkcg);  in blkcg_css_offline()
1004 	blkcg_unpin_online(blkcg);  in blkcg_css_offline()
1018 void blkcg_destroy_blkgs(struct blkcg *blkcg)  in blkcg_destroy_blkgs()  argument
1020 	spin_lock_irq(&blkcg->lock);  in blkcg_destroy_blkgs()
1022 	while (!hlist_empty(&blkcg->blkg_list)) {  in blkcg_destroy_blkgs()
1023 		struct blkcg_gq *blkg = hlist_entry(blkcg->blkg_list.first,  in blkcg_destroy_blkgs()
1031 			spin_unlock_irq(&blkcg->lock);  in blkcg_destroy_blkgs()
1033 			spin_lock_irq(&blkcg->lock);  in blkcg_destroy_blkgs()
1037 	spin_unlock_irq(&blkcg->lock);  in blkcg_destroy_blkgs()
1042 	struct blkcg *blkcg = css_to_blkcg(css);  in blkcg_css_free()  local
1047 	list_del(&blkcg->all_blkcgs_node);  in blkcg_css_free()
1050 		if (blkcg->cpd[i])  in blkcg_css_free()
1051 			blkcg_policy[i]->cpd_free_fn(blkcg->cpd[i]);  in blkcg_css_free()
1055 	kfree(blkcg);  in blkcg_css_free()
1061 	struct blkcg *blkcg;  in blkcg_css_alloc()  local
1068 		blkcg = &blkcg_root;  in blkcg_css_alloc()
1070 		blkcg = kzalloc(sizeof(*blkcg), GFP_KERNEL);  in blkcg_css_alloc()
1071 		if (!blkcg) {  in blkcg_css_alloc()
1095 		blkcg->cpd[i] = cpd;  in blkcg_css_alloc()
1096 		cpd->blkcg = blkcg;  in blkcg_css_alloc()
1102 	spin_lock_init(&blkcg->lock);  in blkcg_css_alloc()
1103 	refcount_set(&blkcg->online_pin, 1);  in blkcg_css_alloc()
1104 	INIT_RADIX_TREE(&blkcg->blkg_tree, GFP_NOWAIT | __GFP_NOWARN);  in blkcg_css_alloc()
1105 	INIT_HLIST_HEAD(&blkcg->blkg_list);  in blkcg_css_alloc()
1107 	INIT_LIST_HEAD(&blkcg->cgwb_list);  in blkcg_css_alloc()
1109 	list_add_tail(&blkcg->all_blkcgs_node, &all_blkcgs);  in blkcg_css_alloc()
1112 	return &blkcg->css;  in blkcg_css_alloc()
1116 		if (blkcg->cpd[i])  in blkcg_css_alloc()
1117 			blkcg_policy[i]->cpd_free_fn(blkcg->cpd[i]);  in blkcg_css_alloc()
1119 	if (blkcg != &blkcg_root)  in blkcg_css_alloc()
1120 		kfree(blkcg);  in blkcg_css_alloc()
1128 	struct blkcg *blkcg = css_to_blkcg(css);  in blkcg_css_online()  local
1129 	struct blkcg *parent = blkcg_parent(blkcg);  in blkcg_css_online()
1244 		struct blkcg *blkcg;  in blkcg_bind()  local
1249 		list_for_each_entry(blkcg, &all_blkcgs, all_blkcgs_node)  in blkcg_bind()
1250 			if (blkcg->cpd[pol->plid])  in blkcg_bind()
1251 				pol->cpd_bind_fn(blkcg->cpd[pol->plid]);  in blkcg_bind()
1330 					      blkg->blkcg);  in blkcg_activate_policy()
1348 						       blkg->blkcg);  in blkcg_activate_policy()
1441 	struct blkcg *blkcg;  in blkcg_policy_register()  local
1468 		list_for_each_entry(blkcg, &all_blkcgs, all_blkcgs_node) {  in blkcg_policy_register()
1475 			blkcg->cpd[pol->plid] = cpd;  in blkcg_policy_register()
1476 			cpd->blkcg = blkcg;  in blkcg_policy_register()
1497 		list_for_each_entry(blkcg, &all_blkcgs, all_blkcgs_node) {  in blkcg_policy_register()
1498 			if (blkcg->cpd[pol->plid]) {  in blkcg_policy_register()
1499 				pol->cpd_free_fn(blkcg->cpd[pol->plid]);  in blkcg_policy_register()
1500 				blkcg->cpd[pol->plid] = NULL;  in blkcg_policy_register()
1520 	struct blkcg *blkcg;  in blkcg_policy_unregister()  local
1537 		list_for_each_entry(blkcg, &all_blkcgs, all_blkcgs_node) {  in blkcg_policy_unregister()
1538 			if (blkcg->cpd[pol->plid]) {  in blkcg_policy_unregister()
1539 				pol->cpd_free_fn(blkcg->cpd[pol->plid]);  in blkcg_policy_unregister()
1540 				blkcg->cpd[pol->plid] = NULL;  in blkcg_policy_unregister()
1704 	struct blkcg *blkcg;  in blkcg_maybe_throttle_current()  local
1717 		blkcg = css_to_blkcg(css);  in blkcg_maybe_throttle_current()
1719 		blkcg = css_to_blkcg(task_css(current, io_cgrp_id));  in blkcg_maybe_throttle_current()
1721 	if (!blkcg)  in blkcg_maybe_throttle_current()
1723 	blkg = blkg_lookup(blkcg, q);  in blkcg_maybe_throttle_current()
1918 		cgroup_rstat_updated(bio->bi_blkg->blkcg->css.cgroup, cpu);  in blk_cgroup_bio_start()