44 void wb_start_background_writeback(struct bdi_writeback *wb);
46 void wb_wakeup_delayed(struct bdi_writeback *wb);
56 static inline bool wb_has_dirty_io(struct bdi_writeback *wb)  in wb_has_dirty_io()  argument
58 	return test_bit(WB_has_dirty_io, &wb->state);  in wb_has_dirty_io()
70 static inline void __add_wb_stat(struct bdi_writeback *wb,  in __add_wb_stat()  argument
73 	percpu_counter_add_batch(&wb->stat[item], amount, WB_STAT_BATCH);  in __add_wb_stat()
76 static inline void inc_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)  in inc_wb_stat()  argument
78 	__add_wb_stat(wb, item, 1);  in inc_wb_stat()
81 static inline void dec_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)  in dec_wb_stat()  argument
83 	__add_wb_stat(wb, item, -1);  in dec_wb_stat()
86 static inline s64 wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)  in wb_stat()  argument
88 	return percpu_counter_read_positive(&wb->stat[item]);  in wb_stat()
91 static inline s64 wb_stat_sum(struct bdi_writeback *wb, enum wb_stat_item item)  in wb_stat_sum()  argument
93 	return percpu_counter_sum_positive(&wb->stat[item]);  in wb_stat_sum()
96 extern void wb_writeout_inc(struct bdi_writeback *wb);
153 static inline bool writeback_in_progress(struct bdi_writeback *wb)  in writeback_in_progress()  argument
155 	return test_bit(WB_writeback_running, &wb->state);  in writeback_in_progress()
173 static inline int wb_congested(struct bdi_writeback *wb, int cong_bits)  in wb_congested()  argument
175 	struct backing_dev_info *bdi = wb->bdi;  in wb_congested()
179 	return wb->congested->state & cong_bits;  in wb_congested()
275 	struct bdi_writeback *wb;  in wb_find_current()  local
279 		return &bdi->wb;  in wb_find_current()
281 	wb = radix_tree_lookup(&bdi->cgwb_tree, memcg_css->id);  in wb_find_current()
287 	if (likely(wb && wb->blkcg_css == task_css(current, io_cgrp_id)))  in wb_find_current()
288 		return wb;  in wb_find_current()
304 	struct bdi_writeback *wb;  in wb_get_create_current()  local
307 	wb = wb_find_current(bdi);  in wb_get_create_current()
308 	if (wb && unlikely(!wb_tryget(wb)))  in wb_get_create_current()
309 		wb = NULL;  in wb_get_create_current()
312 	if (unlikely(!wb)) {  in wb_get_create_current()
316 		wb = wb_get_create(bdi, memcg_css, gfp);  in wb_get_create_current()
319 	return wb;  in wb_get_create_current()
425 	return &bdi->wb;  in wb_find_current()
431 	return &bdi->wb;  in wb_get_create_current()
441 	return &inode_to_bdi(inode)->wb;  in inode_to_wb()
465 	return wb_congested(&inode_to_bdi(inode)->wb, cong_bits);  in inode_congested()
488 	return wb_congested(&bdi->wb, cong_bits);  in bdi_congested()