619 	/* If plug is not used, add new plug here to cache nsecs time. */  in __submit_bio()
620 	struct blk_plug plug;  in __submit_bio()  local
625 	blk_start_plug(&plug);  in __submit_bio()
642 	blk_finish_plug(&plug);  in __submit_bio()
940 	blk_flush_plug(current->plug, false);  in bio_poll()
1112 void blk_start_plug_nr_ios(struct blk_plug *plug, unsigned short nr_ios)  in blk_start_plug_nr_ios()  argument
1117 	 * If this is a nested plug, don't actually assign it.  in blk_start_plug_nr_ios()
1119 	if (tsk->plug)  in blk_start_plug_nr_ios()
1122 	plug->cur_ktime = 0;  in blk_start_plug_nr_ios()
1123 	rq_list_init(&plug->mq_list);  in blk_start_plug_nr_ios()
1124 	rq_list_init(&plug->cached_rqs);  in blk_start_plug_nr_ios()
1125 	plug->nr_ios = min_t(unsigned short, nr_ios, BLK_MAX_REQUEST_COUNT);  in blk_start_plug_nr_ios()
1126 	plug->rq_count = 0;  in blk_start_plug_nr_ios()
1127 	plug->multiple_queues = false;  in blk_start_plug_nr_ios()
1128 	plug->has_elevator = false;  in blk_start_plug_nr_ios()
1129 	INIT_LIST_HEAD(&plug->cb_list);  in blk_start_plug_nr_ios()
1135 	tsk->plug = plug;  in blk_start_plug_nr_ios()
1140  * @plug:	The &struct blk_plug that needs to be initialized
1158  *   plug. By flushing the pending I/O when the process goes to sleep, we avoid
1161 void blk_start_plug(struct blk_plug *plug)  in blk_start_plug()  argument
1163 	blk_start_plug_nr_ios(plug, 1);  in blk_start_plug()
1167 static void flush_plug_callbacks(struct blk_plug *plug, bool from_schedule)  in flush_plug_callbacks()  argument
1171 	while (!list_empty(&plug->cb_list)) {  in flush_plug_callbacks()
1172 		list_splice_init(&plug->cb_list, &callbacks);  in flush_plug_callbacks()
1187 	struct blk_plug *plug = current->plug;  in blk_check_plugged()  local
1190 	if (!plug)  in blk_check_plugged()
1193 	list_for_each_entry(cb, &plug->cb_list, list)  in blk_check_plugged()
1203 		list_add(&cb->list, &plug->cb_list);  in blk_check_plugged()
1209 void __blk_flush_plug(struct blk_plug *plug, bool from_schedule)  in __blk_flush_plug()  argument
1211 	if (!list_empty(&plug->cb_list))  in __blk_flush_plug()
1212 		flush_plug_callbacks(plug, from_schedule);  in __blk_flush_plug()
1213 	blk_mq_flush_plug_list(plug, from_schedule);  in __blk_flush_plug()
1220 	if (unlikely(!rq_list_empty(&plug->cached_rqs)))  in __blk_flush_plug()
1221 		blk_mq_free_plug_rqs(plug);  in __blk_flush_plug()
1223 	plug->cur_ktime = 0;  in __blk_flush_plug()
1229  * @plug:	The &struct blk_plug passed to blk_start_plug()
1237 void blk_finish_plug(struct blk_plug *plug)  in blk_finish_plug()  argument
1239 	if (plug == current->plug) {  in blk_finish_plug()
1240 		__blk_flush_plug(plug, false);  in blk_finish_plug()
1241 		current->plug = NULL;  in blk_finish_plug()