63 			     struct bdi_writeback *wb)  in collect_wb_stats()  argument
67 	spin_lock(&wb->list_lock);  in collect_wb_stats()
68 	list_for_each_entry(inode, &wb->b_dirty, i_io_list)  in collect_wb_stats()
70 	list_for_each_entry(inode, &wb->b_io, i_io_list)  in collect_wb_stats()
72 	list_for_each_entry(inode, &wb->b_more_io, i_io_list)  in collect_wb_stats()
74 	list_for_each_entry(inode, &wb->b_dirty_time, i_io_list)  in collect_wb_stats()
77 	spin_unlock(&wb->list_lock);  in collect_wb_stats()
79 	stats->nr_writeback += wb_stat(wb, WB_WRITEBACK);  in collect_wb_stats()
80 	stats->nr_reclaimable += wb_stat(wb, WB_RECLAIMABLE);  in collect_wb_stats()
81 	stats->nr_dirtied += wb_stat(wb, WB_DIRTIED);  in collect_wb_stats()
82 	stats->nr_written += wb_stat(wb, WB_WRITTEN);  in collect_wb_stats()
83 	stats->wb_thresh += wb_calc_thresh(wb, stats->dirty_thresh);  in collect_wb_stats()
90 	struct bdi_writeback *wb;  in bdi_collect_stats()  local
93 	list_for_each_entry_rcu(wb, &bdi->wb_list, bdi_node) {  in bdi_collect_stats()
94 		if (!wb_tryget(wb))  in bdi_collect_stats()
97 		collect_wb_stats(stats, wb);  in bdi_collect_stats()
98 		wb_put(wb);  in bdi_collect_stats()
106 	collect_wb_stats(stats, &bdi->wb);  in bdi_collect_stats()
152 		   !list_empty(&bdi->bdi_list), bdi->wb.state);  in bdi_debug_stats_show()
158 static void wb_stats_show(struct seq_file *m, struct bdi_writeback *wb,  in wb_stats_show()  argument
176 		   cgroup_ino(wb->memcg_css->cgroup),  in wb_stats_show()
185 		   K(wb->avg_write_bandwidth),  in wb_stats_show()
190 		   wb->state);  in wb_stats_show()
198 	struct bdi_writeback *wb;  in cgwb_debug_stats_show()  local
203 	list_for_each_entry_rcu(wb, &bdi->wb_list, bdi_node) {  in cgwb_debug_stats_show()
206 		if (!wb_tryget(wb))  in cgwb_debug_stats_show()
209 		collect_wb_stats(&stats, wb);  in cgwb_debug_stats_show()
217 		if (mem_cgroup_wb_domain(wb)) {  in cgwb_debug_stats_show()
219 			stats.wb_thresh = min(stats.wb_thresh, cgwb_calc_thresh(wb));  in cgwb_debug_stats_show()
223 		wb_stats_show(m, wb, &stats);  in cgwb_debug_stats_show()
225 		wb_put(wb);  in cgwb_debug_stats_show()
504 	struct bdi_writeback *wb = container_of(to_delayed_work(work),  in wb_update_bandwidth_workfn()  local
507 	wb_update_bandwidth(wb);  in wb_update_bandwidth_workfn()
515 static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi,  in wb_init()  argument
520 	memset(wb, 0, sizeof(*wb));  in wb_init()
522 	wb->bdi = bdi;  in wb_init()
523 	wb->last_old_flush = jiffies;  in wb_init()
524 	INIT_LIST_HEAD(&wb->b_dirty);  in wb_init()
525 	INIT_LIST_HEAD(&wb->b_io);  in wb_init()
526 	INIT_LIST_HEAD(&wb->b_more_io);  in wb_init()
527 	INIT_LIST_HEAD(&wb->b_dirty_time);  in wb_init()
528 	spin_lock_init(&wb->list_lock);  in wb_init()
530 	atomic_set(&wb->writeback_inodes, 0);  in wb_init()
531 	wb->bw_time_stamp = jiffies;  in wb_init()
532 	wb->balanced_dirty_ratelimit = INIT_BW;  in wb_init()
533 	wb->dirty_ratelimit = INIT_BW;  in wb_init()
534 	wb->write_bandwidth = INIT_BW;  in wb_init()
535 	wb->avg_write_bandwidth = INIT_BW;  in wb_init()
537 	spin_lock_init(&wb->work_lock);  in wb_init()
538 	INIT_LIST_HEAD(&wb->work_list);  in wb_init()
539 	INIT_DELAYED_WORK(&wb->dwork, wb_workfn);  in wb_init()
540 	INIT_DELAYED_WORK(&wb->bw_dwork, wb_update_bandwidth_workfn);  in wb_init()
542 	err = fprop_local_init_percpu(&wb->completions, gfp);  in wb_init()
546 	err = percpu_counter_init_many(wb->stat, 0, gfp, NR_WB_STAT_ITEMS);  in wb_init()
548 		fprop_local_destroy_percpu(&wb->completions);  in wb_init()
553 static void cgwb_remove_from_bdi_list(struct bdi_writeback *wb);
558 static void wb_shutdown(struct bdi_writeback *wb)  in wb_shutdown()  argument
561 	spin_lock_irq(&wb->work_lock);  in wb_shutdown()
562 	if (!test_and_clear_bit(WB_registered, &wb->state)) {  in wb_shutdown()
563 		spin_unlock_irq(&wb->work_lock);  in wb_shutdown()
566 	spin_unlock_irq(&wb->work_lock);  in wb_shutdown()
568 	cgwb_remove_from_bdi_list(wb);  in wb_shutdown()
574 	mod_delayed_work(bdi_wq, &wb->dwork, 0);  in wb_shutdown()
575 	flush_delayed_work(&wb->dwork);  in wb_shutdown()
576 	WARN_ON(!list_empty(&wb->work_list));  in wb_shutdown()
577 	flush_delayed_work(&wb->bw_dwork);  in wb_shutdown()
580 static void wb_exit(struct bdi_writeback *wb)  in wb_exit()  argument
582 	WARN_ON(delayed_work_pending(&wb->dwork));  in wb_exit()
583 	percpu_counter_destroy_many(wb->stat, NR_WB_STAT_ITEMS);  in wb_exit()
584 	fprop_local_destroy_percpu(&wb->completions);  in wb_exit()
604 	struct bdi_writeback *wb = container_of(rcu_head,  in cgwb_free_rcu()  local
607 	percpu_ref_exit(&wb->refcnt);  in cgwb_free_rcu()
608 	kfree(wb);  in cgwb_free_rcu()
613 	struct bdi_writeback *wb = container_of(work, struct bdi_writeback,  in cgwb_release_workfn()  local
615 	struct backing_dev_info *bdi = wb->bdi;  in cgwb_release_workfn()
617 	mutex_lock(&wb->bdi->cgwb_release_mutex);  in cgwb_release_workfn()
618 	wb_shutdown(wb);  in cgwb_release_workfn()
620 	css_put(wb->memcg_css);  in cgwb_release_workfn()
621 	css_put(wb->blkcg_css);  in cgwb_release_workfn()
622 	mutex_unlock(&wb->bdi->cgwb_release_mutex);  in cgwb_release_workfn()
625 	blkcg_unpin_online(wb->blkcg_css);  in cgwb_release_workfn()
627 	fprop_local_destroy_percpu(&wb->memcg_completions);  in cgwb_release_workfn()
630 	list_del(&wb->offline_node);  in cgwb_release_workfn()
633 	wb_exit(wb);  in cgwb_release_workfn()
635 	WARN_ON_ONCE(!list_empty(&wb->b_attached));  in cgwb_release_workfn()
636 	WARN_ON_ONCE(work_pending(&wb->switch_work));  in cgwb_release_workfn()
637 	call_rcu(&wb->rcu, cgwb_free_rcu);  in cgwb_release_workfn()
642 	struct bdi_writeback *wb = container_of(refcnt, struct bdi_writeback,  in cgwb_release()  local
644 	queue_work(cgwb_release_wq, &wb->release_work);  in cgwb_release()
647 static void cgwb_kill(struct bdi_writeback *wb)  in cgwb_kill()  argument
651 	WARN_ON(!radix_tree_delete(&wb->bdi->cgwb_tree, wb->memcg_css->id));  in cgwb_kill()
652 	list_del(&wb->memcg_node);  in cgwb_kill()
653 	list_del(&wb->blkcg_node);  in cgwb_kill()
654 	list_add(&wb->offline_node, &offline_cgwbs);  in cgwb_kill()
655 	percpu_ref_kill(&wb->refcnt);  in cgwb_kill()
658 static void cgwb_remove_from_bdi_list(struct bdi_writeback *wb)  in cgwb_remove_from_bdi_list()  argument
661 	list_del_rcu(&wb->bdi_node);  in cgwb_remove_from_bdi_list()
671 	struct bdi_writeback *wb;  in cgwb_create()  local
682 	wb = radix_tree_lookup(&bdi->cgwb_tree, memcg_css->id);  in cgwb_create()
683 	if (wb && wb->blkcg_css != blkcg_css) {  in cgwb_create()
684 		cgwb_kill(wb);  in cgwb_create()
685 		wb = NULL;  in cgwb_create()
688 	if (wb)  in cgwb_create()
692 	wb = kmalloc(sizeof(*wb), gfp);  in cgwb_create()
693 	if (!wb) {  in cgwb_create()
698 	ret = wb_init(wb, bdi, gfp);  in cgwb_create()
702 	ret = percpu_ref_init(&wb->refcnt, cgwb_release, 0, gfp);  in cgwb_create()
706 	ret = fprop_local_init_percpu(&wb->memcg_completions, gfp);  in cgwb_create()
710 	wb->memcg_css = memcg_css;  in cgwb_create()
711 	wb->blkcg_css = blkcg_css;  in cgwb_create()
712 	INIT_LIST_HEAD(&wb->b_attached);  in cgwb_create()
713 	INIT_WORK(&wb->switch_work, inode_switch_wbs_work_fn);  in cgwb_create()
714 	init_llist_head(&wb->switch_wbs_ctxs);  in cgwb_create()
715 	INIT_WORK(&wb->release_work, cgwb_release_workfn);  in cgwb_create()
716 	set_bit(WB_registered, &wb->state);  in cgwb_create()
727 	if (test_bit(WB_registered, &bdi->wb.state) &&  in cgwb_create()
730 		ret = radix_tree_insert(&bdi->cgwb_tree, memcg_css->id, wb);  in cgwb_create()
732 			list_add_tail_rcu(&wb->bdi_node, &bdi->wb_list);  in cgwb_create()
733 			list_add(&wb->memcg_node, memcg_cgwb_list);  in cgwb_create()
734 			list_add(&wb->blkcg_node, blkcg_cgwb_list);  in cgwb_create()
750 	fprop_local_destroy_percpu(&wb->memcg_completions);  in cgwb_create()
752 	percpu_ref_exit(&wb->refcnt);  in cgwb_create()
754 	wb_exit(wb);  in cgwb_create()
756 	kfree(wb);  in cgwb_create()
788 	struct bdi_writeback *wb;  in wb_get_lookup()  local
791 		return &bdi->wb;  in wb_get_lookup()
794 	wb = radix_tree_lookup(&bdi->cgwb_tree, memcg_css->id);  in wb_get_lookup()
795 	if (wb) {  in wb_get_lookup()
800 		if (unlikely(wb->blkcg_css != blkcg_css || !wb_tryget(wb)))  in wb_get_lookup()
801 			wb = NULL;  in wb_get_lookup()
806 	return wb;  in wb_get_lookup()
822 	struct bdi_writeback *wb;  in wb_get_create()  local
827 		wb = wb_get_lookup(bdi, memcg_css);  in wb_get_create()
828 	} while (!wb && !cgwb_create(bdi, memcg_css, gfp));  in wb_get_create()
830 	return wb;  in wb_get_create()
841 	ret = wb_init(&bdi->wb, bdi, GFP_KERNEL);  in cgwb_bdi_init()
843 		bdi->wb.memcg_css = &root_mem_cgroup->css;  in cgwb_bdi_init()
844 		bdi->wb.blkcg_css = blkcg_root_css;  in cgwb_bdi_init()
845 		INIT_WORK(&bdi->wb.switch_work, inode_switch_wbs_work_fn);  in cgwb_bdi_init()
846 		init_llist_head(&bdi->wb.switch_wbs_ctxs);  in cgwb_bdi_init()
855 	struct bdi_writeback *wb;  in cgwb_bdi_unregister()  local
857 	WARN_ON(test_bit(WB_registered, &bdi->wb.state));  in cgwb_bdi_unregister()
867 		wb = list_first_entry(&bdi->wb_list, struct bdi_writeback,  in cgwb_bdi_unregister()
870 		wb_shutdown(wb);  in cgwb_bdi_unregister()
886 	struct bdi_writeback *wb;  in cleanup_offline_cgwbs_workfn()  local
892 		wb = list_first_entry(&offline_cgwbs, struct bdi_writeback,  in cleanup_offline_cgwbs_workfn()
894 		list_move(&wb->offline_node, &processed);  in cleanup_offline_cgwbs_workfn()
905 		if (wb_has_dirty_io(wb))  in cleanup_offline_cgwbs_workfn()
908 		if (!wb_tryget(wb))  in cleanup_offline_cgwbs_workfn()
912 		while (cleanup_offline_cgwb(wb))  in cleanup_offline_cgwbs_workfn()
916 		wb_put(wb);  in cleanup_offline_cgwbs_workfn()
934 	struct bdi_writeback *wb, *next;  in wb_memcg_offline()  local
937 	list_for_each_entry_safe(wb, next, memcg_cgwb_list, memcg_node)  in wb_memcg_offline()
938 		cgwb_kill(wb);  in wb_memcg_offline()
953 	struct bdi_writeback *wb, *next;  in wb_blkcg_offline()  local
957 	list_for_each_entry_safe(wb, next, list, blkcg_node)  in wb_blkcg_offline()
958 		cgwb_kill(wb);  in wb_blkcg_offline()
966 	list_add_tail_rcu(&bdi->wb.bdi_node, &bdi->wb_list);  in cgwb_bdi_register()
989 	return wb_init(&bdi->wb, bdi, GFP_KERNEL);  in cgwb_bdi_init()
996 	list_add_tail_rcu(&bdi->wb.bdi_node, &bdi->wb_list);  in cgwb_bdi_register()
999 static void cgwb_remove_from_bdi_list(struct bdi_writeback *wb)  in cgwb_remove_from_bdi_list()  argument
1001 	list_del_rcu(&wb->bdi_node);  in cgwb_remove_from_bdi_list()
1107 	set_bit(WB_registered, &bdi->wb.state);  in bdi_register_va()
1163 	wb_shutdown(&bdi->wb);  in bdi_unregister()
1191 	WARN_ON_ONCE(test_bit(WB_registered, &bdi->wb.state));  in release_bdi()
1193 	wb_exit(&bdi->wb);  in release_bdi()