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);
126  * @wb: bdi_writeback of interest
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()
203  * wb_find_current - find wb for %current on a bdi
206  * Find the wb of @bdi which matches both the memcg and blkcg of %current.
207  * Must be called under rcu_read_lock() which protects the returend wb.
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()
231  * wb_get_create_current - get or create wb for %current on a bdi
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()
261  * inode_to_wb_is_valid - test whether an inode has a wb associated
264  * Returns %true if @inode has a wb associated.  May be called without any
273  * inode_to_wb - determine the wb of an inode
276  * Returns the wb @inode is currently associated with.  The caller must be
278  * associated wb's list_lock.
292  * unlocked_inode_to_wb_begin - begin unlocked inode wb access transaction
296  * The caller wants to access the wb associated with @inode but isn't
297  * holding inode->i_lock, the i_pages lock or wb->list_lock.  This
298  * function determines the wb associated with @inode and ensures that the
313 	 * ensures that we see the new wb if we see cleared I_WB_SWITCH.  in unlocked_inode_to_wb_begin()
328  * unlocked_inode_to_wb_end - end inode wb access transaction
350 	return &bdi->wb;  in wb_find_current()
356 	return &bdi->wb;  in wb_get_create_current()
366 	return &inode_to_bdi(inode)->wb;  in inode_to_wb()
390 	return wb_congested(&inode_to_bdi(inode)->wb, cong_bits);  in inode_congested()
413 	return wb_congested(&bdi->wb, cong_bits);  in bdi_congested()