898 void clear_wb_congested(struct bdi_writeback_congested *congested, int sync)  in clear_wb_congested()  argument
900 	wait_queue_head_t *wqh = &congestion_wqh[sync];  in clear_wb_congested()
903 	bit = sync ? WB_sync_congested : WB_async_congested;  in clear_wb_congested()
905 		atomic_dec(&nr_wb_congested[sync]);  in clear_wb_congested()
912 void set_wb_congested(struct bdi_writeback_congested *congested, int sync)  in set_wb_congested()  argument
916 	bit = sync ? WB_sync_congested : WB_async_congested;  in set_wb_congested()
918 		atomic_inc(&nr_wb_congested[sync]);  in set_wb_congested()
931 long congestion_wait(int sync, long timeout)  in congestion_wait()  argument
936 	wait_queue_head_t *wqh = &congestion_wqh[sync];  in congestion_wait()
968 long wait_iff_congested(struct zone *zone, int sync, long timeout)  in wait_iff_congested()  argument
973 	wait_queue_head_t *wqh = &congestion_wqh[sync];  in wait_iff_congested()
980 	if (atomic_read(&nr_wb_congested[sync]) == 0 ||  in wait_iff_congested()