39 void wb_start_background_writeback(struct bdi_writeback *wb);
41 void wb_wakeup_delayed(struct bdi_writeback *wb);
50 static inline bool wb_has_dirty_io(struct bdi_writeback *wb)  in wb_has_dirty_io()  argument
52 	return test_bit(WB_has_dirty_io, &wb->state);  in wb_has_dirty_io()
64 static inline void wb_stat_mod(struct bdi_writeback *wb,  in wb_stat_mod()  argument
67 	percpu_counter_add_batch(&wb->stat[item], amount, WB_STAT_BATCH);  in wb_stat_mod()
70 static inline void inc_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)  in inc_wb_stat()  argument
72 	wb_stat_mod(wb, item, 1);  in inc_wb_stat()
75 static inline void dec_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)  in dec_wb_stat()  argument
77 	wb_stat_mod(wb, item, -1);  in dec_wb_stat()
80 static inline s64 wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)  in wb_stat()  argument
82 	return percpu_counter_read_positive(&wb->stat[item]);  in wb_stat()
85 static inline s64 wb_stat_sum(struct bdi_writeback *wb, enum wb_stat_item item)  in wb_stat_sum()  argument
87 	return percpu_counter_sum_positive(&wb->stat[item]);  in wb_stat_sum()
90 extern void wb_writeout_inc(struct bdi_writeback *wb);
135  * @wb: bdi_writeback of interest
140 static inline bool writeback_in_progress(struct bdi_writeback *wb)  in writeback_in_progress()  argument
142 	return test_bit(WB_writeback_running, &wb->state);  in writeback_in_progress()
184  * wb_find_current - find wb for %current on a bdi
187  * Find the wb of @bdi which matches both the memcg and blkcg of %current.
188  * Must be called under rcu_read_lock() which protects the returend wb.
194 	struct bdi_writeback *wb;  in wb_find_current()  local
198 		return &bdi->wb;  in wb_find_current()
200 	wb = radix_tree_lookup(&bdi->cgwb_tree, memcg_css->id);  in wb_find_current()
206 	if (likely(wb && wb->blkcg_css == task_css(current, io_cgrp_id)))  in wb_find_current()
207 		return wb;  in wb_find_current()
212  * wb_get_create_current - get or create wb for %current on a bdi
223 	struct bdi_writeback *wb;  in wb_get_create_current()  local
226 	wb = wb_find_current(bdi);  in wb_get_create_current()
227 	if (wb && unlikely(!wb_tryget(wb)))  in wb_get_create_current()
228 		wb = NULL;  in wb_get_create_current()
231 	if (unlikely(!wb)) {  in wb_get_create_current()
235 		wb = wb_get_create(bdi, memcg_css, gfp);  in wb_get_create_current()
238 	return wb;  in wb_get_create_current()
242  * inode_to_wb - determine the wb of an inode
245  * Returns the wb @inode is currently associated with.  The caller must be
247  * associated wb's list_lock.
266 	 * disabled when wbc started. Just use the default wb in that case.  in inode_to_wb_wbc()
268 	return wbc->wb ? wbc->wb : &inode_to_bdi(inode)->wb;  in inode_to_wb_wbc()
272  * unlocked_inode_to_wb_begin - begin unlocked inode wb access transaction
276  * The caller wants to access the wb associated with @inode but isn't
277  * holding inode->i_lock, the i_pages lock or wb->list_lock.  This
278  * function determines the wb associated with @inode and ensures that the
293 	 * ensures that we see the new wb if we see cleared I_WB_SWITCH.  in unlocked_inode_to_wb_begin()
308  * unlocked_inode_to_wb_end - end inode wb access transaction
330 	return &bdi->wb;  in wb_find_current()
336 	return &bdi->wb;  in wb_get_create_current()
341 	return &inode_to_bdi(inode)->wb;  in inode_to_wb()