32 void wb_start_writeback(struct bdi_writeback *wb, long nr_pages,
34 void wb_start_background_writeback(struct bdi_writeback *wb);
36 void wb_wakeup_delayed(struct bdi_writeback *wb);
43 static inline bool wb_has_dirty_io(struct bdi_writeback *wb)  in wb_has_dirty_io()  argument
45 	return test_bit(WB_has_dirty_io, &wb->state);  in wb_has_dirty_io()
57 static inline void __add_wb_stat(struct bdi_writeback *wb,  in __add_wb_stat()  argument
60 	__percpu_counter_add(&wb->stat[item], amount, WB_STAT_BATCH);  in __add_wb_stat()
63 static inline void __inc_wb_stat(struct bdi_writeback *wb,  in __inc_wb_stat()  argument
66 	__add_wb_stat(wb, item, 1);  in __inc_wb_stat()
69 static inline void inc_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)  in inc_wb_stat()  argument
74 	__inc_wb_stat(wb, item);  in inc_wb_stat()
78 static inline void __dec_wb_stat(struct bdi_writeback *wb,  in __dec_wb_stat()  argument
81 	__add_wb_stat(wb, item, -1);  in __dec_wb_stat()
84 static inline void dec_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)  in dec_wb_stat()  argument
89 	__dec_wb_stat(wb, item);  in dec_wb_stat()
93 static inline s64 wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)  in wb_stat()  argument
95 	return percpu_counter_read_positive(&wb->stat[item]);  in wb_stat()
98 static inline s64 __wb_stat_sum(struct bdi_writeback *wb,  in __wb_stat_sum()  argument
101 	return percpu_counter_sum_positive(&wb->stat[item]);  in __wb_stat_sum()
104 static inline s64 wb_stat_sum(struct bdi_writeback *wb, enum wb_stat_item item)  in wb_stat_sum()  argument
110 	sum = __wb_stat_sum(wb, item);  in wb_stat_sum()
116 extern void wb_writeout_inc(struct bdi_writeback *wb);
121 static inline unsigned long wb_stat_error(struct bdi_writeback *wb)  in wb_stat_error()  argument
170 static inline bool writeback_in_progress(struct bdi_writeback *wb)  in writeback_in_progress()  argument
172 	return test_bit(WB_writeback_running, &wb->state);  in writeback_in_progress()
190 static inline int wb_congested(struct bdi_writeback *wb, int cong_bits)  in wb_congested()  argument
192 	struct backing_dev_info *bdi = wb->bdi;  in wb_congested()
196 	return wb->congested->state & cong_bits;  in wb_congested()
287 	struct bdi_writeback *wb;  in wb_find_current()  local
291 		return &bdi->wb;  in wb_find_current()
293 	wb = radix_tree_lookup(&bdi->cgwb_tree, memcg_css->id);  in wb_find_current()
299 	if (likely(wb && wb->blkcg_css == task_css(current, io_cgrp_id)))  in wb_find_current()
300 		return wb;  in wb_find_current()
316 	struct bdi_writeback *wb;  in wb_get_create_current()  local
319 	wb = wb_find_current(bdi);  in wb_get_create_current()
320 	if (wb && unlikely(!wb_tryget(wb)))  in wb_get_create_current()
321 		wb = NULL;  in wb_get_create_current()
324 	if (unlikely(!wb)) {  in wb_get_create_current()
328 		wb = wb_get_create(bdi, memcg_css, gfp);  in wb_get_create_current()
331 	return wb;  in wb_get_create_current()
436 	return &bdi->wb;  in wb_find_current()
442 	return &bdi->wb;  in wb_get_create_current()
452 	return &inode_to_bdi(inode)->wb;  in inode_to_wb()
475 	return wb_congested(&inode_to_bdi(inode)->wb, cong_bits);  in inode_congested()
498 	return wb_congested(&bdi->wb, cong_bits);  in bdi_congested()