41 void wb_start_background_writeback(struct bdi_writeback *wb);
43 void wb_wakeup_delayed(struct bdi_writeback *wb);
53 static inline bool wb_has_dirty_io(struct bdi_writeback *wb)  in wb_has_dirty_io()  argument
55 	return test_bit(WB_has_dirty_io, &wb->state);  in wb_has_dirty_io()
67 static inline void __add_wb_stat(struct bdi_writeback *wb,  in __add_wb_stat()  argument
70 	percpu_counter_add_batch(&wb->stat[item], amount, WB_STAT_BATCH);  in __add_wb_stat()
73 static inline void inc_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)  in inc_wb_stat()  argument
75 	__add_wb_stat(wb, item, 1);  in inc_wb_stat()
78 static inline void dec_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)  in dec_wb_stat()  argument
80 	__add_wb_stat(wb, item, -1);  in dec_wb_stat()
83 static inline s64 wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)  in wb_stat()  argument
85 	return percpu_counter_read_positive(&wb->stat[item]);  in wb_stat()
88 static inline s64 wb_stat_sum(struct bdi_writeback *wb, enum wb_stat_item item)  in wb_stat_sum()  argument
90 	return percpu_counter_sum_positive(&wb->stat[item]);  in wb_stat_sum()
93 extern void wb_writeout_inc(struct bdi_writeback *wb);
131 static inline bool writeback_in_progress(struct bdi_writeback *wb)  in writeback_in_progress()  argument
133 	return test_bit(WB_writeback_running, &wb->state);  in writeback_in_progress()
151 static inline int wb_congested(struct bdi_writeback *wb, int cong_bits)  in wb_congested()  argument
153 	return wb->congested & cong_bits;  in wb_congested()
213 	struct bdi_writeback *wb;  in wb_find_current()  local
217 		return &bdi->wb;  in wb_find_current()
219 	wb = radix_tree_lookup(&bdi->cgwb_tree, memcg_css->id);  in wb_find_current()
225 	if (likely(wb && wb->blkcg_css == task_css(current, io_cgrp_id)))  in wb_find_current()
226 		return wb;  in wb_find_current()
242 	struct bdi_writeback *wb;  in wb_get_create_current()  local
245 	wb = wb_find_current(bdi);  in wb_get_create_current()
246 	if (wb && unlikely(!wb_tryget(wb)))  in wb_get_create_current()
247 		wb = NULL;  in wb_get_create_current()
250 	if (unlikely(!wb)) {  in wb_get_create_current()
254 		wb = wb_get_create(bdi, memcg_css, gfp);  in wb_get_create_current()
257 	return wb;  in wb_get_create_current()
299 	return wbc->wb ? wbc->wb : &inode_to_bdi(inode)->wb;  in inode_to_wb_wbc()
361 	return &bdi->wb;  in wb_find_current()
367 	return &bdi->wb;  in wb_get_create_current()
377 	return &inode_to_bdi(inode)->wb;  in inode_to_wb()
409 	return wb_congested(&inode_to_bdi(inode)->wb, cong_bits);  in inode_congested()
432 	return wb_congested(&bdi->wb, cong_bits);  in bdi_congested()