39 void wb_start_background_writeback(struct bdi_writeback *wb);
41 void wb_wakeup_delayed(struct bdi_writeback *wb);
51 static inline bool wb_has_dirty_io(struct bdi_writeback *wb)  in wb_has_dirty_io()  argument
53 	return test_bit(WB_has_dirty_io, &wb->state);  in wb_has_dirty_io()
65 static inline void wb_stat_mod(struct bdi_writeback *wb,  in wb_stat_mod()  argument
68 	percpu_counter_add_batch(&wb->stat[item], amount, WB_STAT_BATCH);  in wb_stat_mod()
71 static inline void inc_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)  in inc_wb_stat()  argument
73 	wb_stat_mod(wb, item, 1);  in inc_wb_stat()
76 static inline void dec_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)  in dec_wb_stat()  argument
78 	wb_stat_mod(wb, item, -1);  in dec_wb_stat()
81 static inline s64 wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)  in wb_stat()  argument
83 	return percpu_counter_read_positive(&wb->stat[item]);  in wb_stat()
86 static inline s64 wb_stat_sum(struct bdi_writeback *wb, enum wb_stat_item item)  in wb_stat_sum()  argument
88 	return percpu_counter_sum_positive(&wb->stat[item]);  in wb_stat_sum()
91 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()
185 	struct bdi_writeback *wb;  in wb_find_current()  local
189 		return &bdi->wb;  in wb_find_current()
191 	wb = radix_tree_lookup(&bdi->cgwb_tree, memcg_css->id);  in wb_find_current()
197 	if (likely(wb && wb->blkcg_css == task_css(current, io_cgrp_id)))  in wb_find_current()
198 		return wb;  in wb_find_current()
214 	struct bdi_writeback *wb;  in wb_get_create_current()  local
217 	wb = wb_find_current(bdi);  in wb_get_create_current()
218 	if (wb && unlikely(!wb_tryget(wb)))  in wb_get_create_current()
219 		wb = NULL;  in wb_get_create_current()
222 	if (unlikely(!wb)) {  in wb_get_create_current()
226 		wb = wb_get_create(bdi, memcg_css, gfp);  in wb_get_create_current()
229 	return wb;  in wb_get_create_current()
259 	return wbc->wb ? wbc->wb : &inode_to_bdi(inode)->wb;  in inode_to_wb_wbc()
321 	return &bdi->wb;  in wb_find_current()
327 	return &bdi->wb;  in wb_get_create_current()
332 	return &inode_to_bdi(inode)->wb;  in inode_to_wb()