48 	struct backing_dev_info *bdi = m->private;  in bdi_debug_stats_show()  local
49 	struct bdi_writeback *wb = &bdi->wb;  in bdi_debug_stats_show()
100 		   !list_empty(&bdi->bdi_list), bdi->wb.state);  in bdi_debug_stats_show()
118 static void bdi_debug_register(struct backing_dev_info *bdi, const char *name)  in bdi_debug_register()  argument
120 	bdi->debug_dir = debugfs_create_dir(name, bdi_debug_root);  in bdi_debug_register()
121 	bdi->debug_stats = debugfs_create_file("stats", 0444, bdi->debug_dir,  in bdi_debug_register()
122 					       bdi, &bdi_debug_stats_fops);  in bdi_debug_register()
125 static void bdi_debug_unregister(struct backing_dev_info *bdi)  in bdi_debug_unregister()  argument
127 	debugfs_remove(bdi->debug_stats);  in bdi_debug_unregister()
128 	debugfs_remove(bdi->debug_dir);  in bdi_debug_unregister()
134 static inline void bdi_debug_register(struct backing_dev_info *bdi,  in bdi_debug_register()  argument
138 static inline void bdi_debug_unregister(struct backing_dev_info *bdi)  in bdi_debug_unregister()  argument
147 	struct backing_dev_info *bdi = dev_get_drvdata(dev);  in read_ahead_kb_store()  local
155 	bdi->ra_pages = read_ahead_kb >> (PAGE_SHIFT - 10);  in read_ahead_kb_store()
166 	struct backing_dev_info *bdi = dev_get_drvdata(dev);		\
172 BDI_SHOW(read_ahead_kb, K(bdi->ra_pages))
177 	struct backing_dev_info *bdi = dev_get_drvdata(dev);  in min_ratio_store()  local
185 	ret = bdi_set_min_ratio(bdi, ratio);  in min_ratio_store()
191 BDI_SHOW(min_ratio, bdi->min_ratio)
196 	struct backing_dev_info *bdi = dev_get_drvdata(dev);  in max_ratio_store()  local
204 	ret = bdi_set_max_ratio(bdi, ratio);  in max_ratio_store()
210 BDI_SHOW(max_ratio, bdi->max_ratio)
216 	struct backing_dev_info *bdi = dev_get_drvdata(dev);  in stable_pages_required_show()  local
219 			bdi_cap_stable_pages_required(bdi) ? 1 : 0);  in stable_pages_required_show()
289 static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi,  in wb_init()  argument
296 	wb->bdi = bdi;  in wb_init()
314 	wb->congested = wb_congested_get_create(bdi, blkcg_id, gfp);  in wb_init()
399 wb_congested_get_create(struct backing_dev_info *bdi, int blkcg_id, gfp_t gfp)  in wb_congested_get_create()  argument
407 	node = &bdi->cgwb_congested_tree.rb_node;  in wb_congested_get_create()
427 		rb_insert_color(&congested->rb_node, &bdi->cgwb_congested_tree);  in wb_congested_get_create()
439 	new_congested->bdi = bdi;  in wb_congested_get_create()
467 	if (congested->bdi) {  in wb_congested_put()
469 			 &congested->bdi->cgwb_congested_tree);  in wb_congested_put()
470 		congested->bdi = NULL;  in wb_congested_put()
481 	struct backing_dev_info *bdi = wb->bdi;  in cgwb_release_workfn()  local
497 	if (atomic_dec_and_test(&bdi->usage_cnt))  in cgwb_release_workfn()
512 	WARN_ON(!radix_tree_delete(&wb->bdi->cgwb_tree, wb->memcg_css->id));  in cgwb_kill()
518 static int cgwb_create(struct backing_dev_info *bdi,  in cgwb_create()  argument
537 	wb = radix_tree_lookup(&bdi->cgwb_tree, memcg_css->id);  in cgwb_create()
551 	ret = wb_init(wb, bdi, blkcg_css->id, gfp);  in cgwb_create()
576 	if (test_bit(WB_registered, &bdi->wb.state) &&  in cgwb_create()
579 		ret = radix_tree_insert(&bdi->cgwb_tree, memcg_css->id, wb);  in cgwb_create()
581 			atomic_inc(&bdi->usage_cnt);  in cgwb_create()
582 			list_add_tail_rcu(&wb->bdi_node, &bdi->wb_list);  in cgwb_create()
634 struct bdi_writeback *wb_get_create(struct backing_dev_info *bdi,  in wb_get_create()  argument
643 		return &bdi->wb;  in wb_get_create()
647 		wb = radix_tree_lookup(&bdi->cgwb_tree, memcg_css->id);  in wb_get_create()
660 	} while (!wb && !cgwb_create(bdi, memcg_css, gfp));  in wb_get_create()
665 static int cgwb_bdi_init(struct backing_dev_info *bdi)  in cgwb_bdi_init()  argument
669 	INIT_RADIX_TREE(&bdi->cgwb_tree, GFP_ATOMIC);  in cgwb_bdi_init()
670 	bdi->cgwb_congested_tree = RB_ROOT;  in cgwb_bdi_init()
671 	atomic_set(&bdi->usage_cnt, 1);  in cgwb_bdi_init()
673 	ret = wb_init(&bdi->wb, bdi, 1, GFP_KERNEL);  in cgwb_bdi_init()
675 		bdi->wb.memcg_css = mem_cgroup_root_css;  in cgwb_bdi_init()
676 		bdi->wb.blkcg_css = blkcg_root_css;  in cgwb_bdi_init()
681 static void cgwb_bdi_destroy(struct backing_dev_info *bdi)  in cgwb_bdi_destroy()  argument
687 	WARN_ON(test_bit(WB_registered, &bdi->wb.state));  in cgwb_bdi_destroy()
691 	radix_tree_for_each_slot(slot, &bdi->cgwb_tree, &iter, 0)  in cgwb_bdi_destroy()
694 	while ((rbn = rb_first(&bdi->cgwb_congested_tree))) {  in cgwb_bdi_destroy()
698 		rb_erase(rbn, &bdi->cgwb_congested_tree);  in cgwb_bdi_destroy()
699 		congested->bdi = NULL;	/* mark @congested unlinked */  in cgwb_bdi_destroy()
709 	atomic_dec(&bdi->usage_cnt);  in cgwb_bdi_destroy()
710 	wait_event(cgwb_release_wait, !atomic_read(&bdi->usage_cnt));  in cgwb_bdi_destroy()
752 static int cgwb_bdi_init(struct backing_dev_info *bdi)  in cgwb_bdi_init()  argument
756 	bdi->wb_congested = kzalloc(sizeof(*bdi->wb_congested), GFP_KERNEL);  in cgwb_bdi_init()
757 	if (!bdi->wb_congested)  in cgwb_bdi_init()
760 	err = wb_init(&bdi->wb, bdi, 1, GFP_KERNEL);  in cgwb_bdi_init()
762 		kfree(bdi->wb_congested);  in cgwb_bdi_init()
768 static void cgwb_bdi_destroy(struct backing_dev_info *bdi) { }  in cgwb_bdi_destroy()  argument
772 int bdi_init(struct backing_dev_info *bdi)  in bdi_init()  argument
776 	bdi->dev = NULL;  in bdi_init()
778 	bdi->min_ratio = 0;  in bdi_init()
779 	bdi->max_ratio = 100;  in bdi_init()
780 	bdi->max_prop_frac = FPROP_FRAC_BASE;  in bdi_init()
781 	INIT_LIST_HEAD(&bdi->bdi_list);  in bdi_init()
782 	INIT_LIST_HEAD(&bdi->wb_list);  in bdi_init()
783 	init_waitqueue_head(&bdi->wb_waitq);  in bdi_init()
785 	ret = cgwb_bdi_init(bdi);  in bdi_init()
787 	list_add_tail_rcu(&bdi->wb.bdi_node, &bdi->wb_list);  in bdi_init()
793 int bdi_register(struct backing_dev_info *bdi, struct device *parent,  in bdi_register()  argument
799 	if (bdi->dev)	/* The driver needs to use separate queues per device */  in bdi_register()
803 	dev = device_create_vargs(bdi_class, parent, MKDEV(0, 0), bdi, fmt, args);  in bdi_register()
808 	bdi->dev = dev;  in bdi_register()
810 	bdi_debug_register(bdi, dev_name(dev));  in bdi_register()
811 	set_bit(WB_registered, &bdi->wb.state);  in bdi_register()
814 	list_add_tail_rcu(&bdi->bdi_list, &bdi_list);  in bdi_register()
817 	trace_writeback_bdi_register(bdi);  in bdi_register()
822 int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev)  in bdi_register_dev()  argument
824 	return bdi_register(bdi, NULL, "%u:%u", MAJOR(dev), MINOR(dev));  in bdi_register_dev()
831 static void bdi_remove_from_list(struct backing_dev_info *bdi)  in bdi_remove_from_list()  argument
834 	list_del_rcu(&bdi->bdi_list);  in bdi_remove_from_list()
840 void bdi_unregister(struct backing_dev_info *bdi)  in bdi_unregister()  argument
843 	bdi_remove_from_list(bdi);  in bdi_unregister()
844 	wb_shutdown(&bdi->wb);  in bdi_unregister()
845 	cgwb_bdi_destroy(bdi);  in bdi_unregister()
847 	if (bdi->dev) {  in bdi_unregister()
848 		bdi_debug_unregister(bdi);  in bdi_unregister()
849 		device_unregister(bdi->dev);  in bdi_unregister()
850 		bdi->dev = NULL;  in bdi_unregister()
854 void bdi_exit(struct backing_dev_info *bdi)  in bdi_exit()  argument
856 	WARN_ON_ONCE(bdi->dev);  in bdi_exit()
857 	wb_exit(&bdi->wb);  in bdi_exit()
860 void bdi_destroy(struct backing_dev_info *bdi)  in bdi_destroy()  argument
862 	bdi_unregister(bdi);  in bdi_destroy()
863 	bdi_exit(bdi);  in bdi_destroy()
871 int bdi_setup_and_register(struct backing_dev_info *bdi, char *name)  in bdi_setup_and_register()  argument
875 	bdi->name = name;  in bdi_setup_and_register()
876 	bdi->capabilities = 0;  in bdi_setup_and_register()
877 	err = bdi_init(bdi);  in bdi_setup_and_register()
881 	err = bdi_register(bdi, NULL, "%.28s-%ld", name,  in bdi_setup_and_register()
884 		bdi_destroy(bdi);  in bdi_setup_and_register()