51 	struct backing_dev_info *bdi = m->private;  in bdi_debug_stats_show()  local
52 	struct bdi_writeback *wb = &bdi->wb;  in bdi_debug_stats_show()
102 		   !list_empty(&bdi->bdi_list), bdi->wb.state);  in bdi_debug_stats_show()
108 static void bdi_debug_register(struct backing_dev_info *bdi, const char *name)  in bdi_debug_register()  argument
110 	bdi->debug_dir = debugfs_create_dir(name, bdi_debug_root);  in bdi_debug_register()
112 	debugfs_create_file("stats", 0444, bdi->debug_dir, bdi,  in bdi_debug_register()
116 static void bdi_debug_unregister(struct backing_dev_info *bdi)  in bdi_debug_unregister()  argument
118 	debugfs_remove_recursive(bdi->debug_dir);  in bdi_debug_unregister()
124 static inline void bdi_debug_register(struct backing_dev_info *bdi,  in bdi_debug_register()  argument
128 static inline void bdi_debug_unregister(struct backing_dev_info *bdi)  in bdi_debug_unregister()  argument
137 	struct backing_dev_info *bdi = dev_get_drvdata(dev);  in read_ahead_kb_store()  local
145 	bdi->ra_pages = read_ahead_kb >> (PAGE_SHIFT - 10);  in read_ahead_kb_store()
154 	struct backing_dev_info *bdi = dev_get_drvdata(dev);		\
160 BDI_SHOW(read_ahead_kb, K(bdi->ra_pages))
165 	struct backing_dev_info *bdi = dev_get_drvdata(dev);  in min_ratio_store()  local
173 	ret = bdi_set_min_ratio(bdi, ratio);  in min_ratio_store()
179 BDI_SHOW(min_ratio, bdi->min_ratio)
184 	struct backing_dev_info *bdi = dev_get_drvdata(dev);  in max_ratio_store()  local
192 	ret = bdi_set_max_ratio(bdi, ratio);  in max_ratio_store()
198 BDI_SHOW(max_ratio, bdi->max_ratio)
232 static int bdi_init(struct backing_dev_info *bdi);
287 static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi,  in wb_init()  argument
294 	if (wb != &bdi->wb)  in wb_init()
295 		bdi_get(bdi);  in wb_init()
296 	wb->bdi = bdi;  in wb_init()
334 	if (wb != &bdi->wb)  in wb_init()
335 		bdi_put(bdi);  in wb_init()
376 	if (wb != &wb->bdi->wb)  in wb_exit()
377 		bdi_put(wb->bdi);  in wb_exit()
401 	mutex_lock(&wb->bdi->cgwb_release_mutex);  in cgwb_release_workfn()
406 	mutex_unlock(&wb->bdi->cgwb_release_mutex);  in cgwb_release_workfn()
434 	WARN_ON(!radix_tree_delete(&wb->bdi->cgwb_tree, wb->memcg_css->id));  in cgwb_kill()
448 static int cgwb_create(struct backing_dev_info *bdi,  in cgwb_create()  argument
467 	wb = radix_tree_lookup(&bdi->cgwb_tree, memcg_css->id);  in cgwb_create()
483 	ret = wb_init(wb, bdi, gfp);  in cgwb_create()
509 	if (test_bit(WB_registered, &bdi->wb.state) &&  in cgwb_create()
512 		ret = radix_tree_insert(&bdi->cgwb_tree, memcg_css->id, wb);  in cgwb_create()
514 			list_add_tail_rcu(&wb->bdi_node, &bdi->wb_list);  in cgwb_create()
566 struct bdi_writeback *wb_get_lookup(struct backing_dev_info *bdi,  in wb_get_lookup()  argument
572 		return &bdi->wb;  in wb_get_lookup()
575 	wb = radix_tree_lookup(&bdi->cgwb_tree, memcg_css->id);  in wb_get_lookup()
599 struct bdi_writeback *wb_get_create(struct backing_dev_info *bdi,  in wb_get_create()  argument
608 		return &bdi->wb;  in wb_get_create()
611 		wb = wb_get_lookup(bdi, memcg_css);  in wb_get_create()
612 	} while (!wb && !cgwb_create(bdi, memcg_css, gfp));  in wb_get_create()
617 static int cgwb_bdi_init(struct backing_dev_info *bdi)  in cgwb_bdi_init()  argument
621 	INIT_RADIX_TREE(&bdi->cgwb_tree, GFP_ATOMIC);  in cgwb_bdi_init()
622 	mutex_init(&bdi->cgwb_release_mutex);  in cgwb_bdi_init()
623 	init_rwsem(&bdi->wb_switch_rwsem);  in cgwb_bdi_init()
625 	ret = wb_init(&bdi->wb, bdi, GFP_KERNEL);  in cgwb_bdi_init()
627 		bdi->wb.memcg_css = &root_mem_cgroup->css;  in cgwb_bdi_init()
628 		bdi->wb.blkcg_css = blkcg_root_css;  in cgwb_bdi_init()
633 static void cgwb_bdi_unregister(struct backing_dev_info *bdi)  in cgwb_bdi_unregister()  argument
639 	WARN_ON(test_bit(WB_registered, &bdi->wb.state));  in cgwb_bdi_unregister()
642 	radix_tree_for_each_slot(slot, &bdi->cgwb_tree, &iter, 0)  in cgwb_bdi_unregister()
646 	mutex_lock(&bdi->cgwb_release_mutex);  in cgwb_bdi_unregister()
648 	while (!list_empty(&bdi->wb_list)) {  in cgwb_bdi_unregister()
649 		wb = list_first_entry(&bdi->wb_list, struct bdi_writeback,  in cgwb_bdi_unregister()
656 	mutex_unlock(&bdi->cgwb_release_mutex);  in cgwb_bdi_unregister()
744 static void cgwb_bdi_register(struct backing_dev_info *bdi)  in cgwb_bdi_register()  argument
747 	list_add_tail_rcu(&bdi->wb.bdi_node, &bdi->wb_list);  in cgwb_bdi_register()
768 static int cgwb_bdi_init(struct backing_dev_info *bdi)  in cgwb_bdi_init()  argument
770 	return wb_init(&bdi->wb, bdi, GFP_KERNEL);  in cgwb_bdi_init()
773 static void cgwb_bdi_unregister(struct backing_dev_info *bdi) { }  in cgwb_bdi_unregister()  argument
775 static void cgwb_bdi_register(struct backing_dev_info *bdi)  in cgwb_bdi_register()  argument
777 	list_add_tail_rcu(&bdi->wb.bdi_node, &bdi->wb_list);  in cgwb_bdi_register()
787 static int bdi_init(struct backing_dev_info *bdi)  in bdi_init()  argument
791 	bdi->dev = NULL;  in bdi_init()
793 	kref_init(&bdi->refcnt);  in bdi_init()
794 	bdi->min_ratio = 0;  in bdi_init()
795 	bdi->max_ratio = 100;  in bdi_init()
796 	bdi->max_prop_frac = FPROP_FRAC_BASE;  in bdi_init()
797 	INIT_LIST_HEAD(&bdi->bdi_list);  in bdi_init()
798 	INIT_LIST_HEAD(&bdi->wb_list);  in bdi_init()
799 	init_waitqueue_head(&bdi->wb_waitq);  in bdi_init()
801 	ret = cgwb_bdi_init(bdi);  in bdi_init()
808 	struct backing_dev_info *bdi;  in bdi_alloc()  local
810 	bdi = kzalloc_node(sizeof(*bdi), GFP_KERNEL, node_id);  in bdi_alloc()
811 	if (!bdi)  in bdi_alloc()
814 	if (bdi_init(bdi)) {  in bdi_alloc()
815 		kfree(bdi);  in bdi_alloc()
818 	bdi->capabilities = BDI_CAP_WRITEBACK | BDI_CAP_WRITEBACK_ACCT;  in bdi_alloc()
819 	bdi->ra_pages = VM_READAHEAD_PAGES;  in bdi_alloc()
820 	bdi->io_pages = VM_READAHEAD_PAGES;  in bdi_alloc()
821 	timer_setup(&bdi->laptop_mode_wb_timer, laptop_mode_timer_fn, 0);  in bdi_alloc()
822 	return bdi;  in bdi_alloc()
830 	struct backing_dev_info *bdi;  in bdi_lookup_rb_node()  local
836 		bdi = rb_entry(parent, struct backing_dev_info, rb_node);  in bdi_lookup_rb_node()
838 		if (bdi->id > id)  in bdi_lookup_rb_node()
840 		else if (bdi->id < id)  in bdi_lookup_rb_node()
860 	struct backing_dev_info *bdi = NULL;  in bdi_get_by_id()  local
866 		bdi = rb_entry(*p, struct backing_dev_info, rb_node);  in bdi_get_by_id()
867 		bdi_get(bdi);  in bdi_get_by_id()
871 	return bdi;  in bdi_get_by_id()
874 int bdi_register_va(struct backing_dev_info *bdi, const char *fmt, va_list args)  in bdi_register_va()  argument
879 	if (bdi->dev)	/* The driver needs to use separate queues per device */  in bdi_register_va()
882 	vsnprintf(bdi->dev_name, sizeof(bdi->dev_name), fmt, args);  in bdi_register_va()
883 	dev = device_create(bdi_class, NULL, MKDEV(0, 0), bdi, bdi->dev_name);  in bdi_register_va()
887 	cgwb_bdi_register(bdi);  in bdi_register_va()
888 	bdi->dev = dev;  in bdi_register_va()
890 	bdi_debug_register(bdi, dev_name(dev));  in bdi_register_va()
891 	set_bit(WB_registered, &bdi->wb.state);  in bdi_register_va()
895 	bdi->id = ++bdi_id_cursor;  in bdi_register_va()
897 	p = bdi_lookup_rb_node(bdi->id, &parent);  in bdi_register_va()
898 	rb_link_node(&bdi->rb_node, parent, p);  in bdi_register_va()
899 	rb_insert_color(&bdi->rb_node, &bdi_tree);  in bdi_register_va()
901 	list_add_tail_rcu(&bdi->bdi_list, &bdi_list);  in bdi_register_va()
905 	trace_writeback_bdi_register(bdi);  in bdi_register_va()
909 int bdi_register(struct backing_dev_info *bdi, const char *fmt, ...)  in bdi_register()  argument
915 	ret = bdi_register_va(bdi, fmt, args);  in bdi_register()
921 void bdi_set_owner(struct backing_dev_info *bdi, struct device *owner)  in bdi_set_owner()  argument
923 	WARN_ON_ONCE(bdi->owner);  in bdi_set_owner()
924 	bdi->owner = owner;  in bdi_set_owner()
931 static void bdi_remove_from_list(struct backing_dev_info *bdi)  in bdi_remove_from_list()  argument
934 	rb_erase(&bdi->rb_node, &bdi_tree);  in bdi_remove_from_list()
935 	list_del_rcu(&bdi->bdi_list);  in bdi_remove_from_list()
941 void bdi_unregister(struct backing_dev_info *bdi)  in bdi_unregister()  argument
943 	del_timer_sync(&bdi->laptop_mode_wb_timer);  in bdi_unregister()
946 	bdi_remove_from_list(bdi);  in bdi_unregister()
947 	wb_shutdown(&bdi->wb);  in bdi_unregister()
948 	cgwb_bdi_unregister(bdi);  in bdi_unregister()
950 	if (bdi->dev) {  in bdi_unregister()
951 		bdi_debug_unregister(bdi);  in bdi_unregister()
952 		device_unregister(bdi->dev);  in bdi_unregister()
953 		bdi->dev = NULL;  in bdi_unregister()
956 	if (bdi->owner) {  in bdi_unregister()
957 		put_device(bdi->owner);  in bdi_unregister()
958 		bdi->owner = NULL;  in bdi_unregister()
964 	struct backing_dev_info *bdi =  in release_bdi()  local
967 	if (test_bit(WB_registered, &bdi->wb.state))  in release_bdi()
968 		bdi_unregister(bdi);  in release_bdi()
969 	WARN_ON_ONCE(bdi->dev);  in release_bdi()
970 	wb_exit(&bdi->wb);  in release_bdi()
971 	kfree(bdi);  in release_bdi()
974 void bdi_put(struct backing_dev_info *bdi)  in bdi_put()  argument
976 	kref_put(&bdi->refcnt, release_bdi);  in bdi_put()
980 const char *bdi_dev_name(struct backing_dev_info *bdi)  in bdi_dev_name()  argument
982 	if (!bdi || !bdi->dev)  in bdi_dev_name()
984 	return bdi->dev_name;  in bdi_dev_name()
994 void clear_bdi_congested(struct backing_dev_info *bdi, int sync)  in clear_bdi_congested()  argument
1000 	if (test_and_clear_bit(bit, &bdi->wb.congested))  in clear_bdi_congested()
1008 void set_bdi_congested(struct backing_dev_info *bdi, int sync)  in set_bdi_congested()  argument
1013 	if (!test_and_set_bit(bit, &bdi->wb.congested))  in set_bdi_congested()