606 	/* If plug is not used, add new plug here to cache nsecs time. */  in __submit_bio()
607 	struct blk_plug plug;  in __submit_bio()  local
612 	blk_start_plug(&plug);  in __submit_bio()
623 	blk_finish_plug(&plug);  in __submit_bio()
927 	blk_flush_plug(current->plug, false);  in bio_poll()
1098 void blk_start_plug_nr_ios(struct blk_plug *plug, unsigned short nr_ios)  in blk_start_plug_nr_ios()  argument
1103 	 * If this is a nested plug, don't actually assign it.  in blk_start_plug_nr_ios()
1105 	if (tsk->plug)  in blk_start_plug_nr_ios()
1108 	plug->cur_ktime = 0;  in blk_start_plug_nr_ios()
1109 	plug->mq_list = NULL;  in blk_start_plug_nr_ios()
1110 	plug->cached_rq = NULL;  in blk_start_plug_nr_ios()
1111 	plug->nr_ios = min_t(unsigned short, nr_ios, BLK_MAX_REQUEST_COUNT);  in blk_start_plug_nr_ios()
1112 	plug->rq_count = 0;  in blk_start_plug_nr_ios()
1113 	plug->multiple_queues = false;  in blk_start_plug_nr_ios()
1114 	plug->has_elevator = false;  in blk_start_plug_nr_ios()
1115 	INIT_LIST_HEAD(&plug->cb_list);  in blk_start_plug_nr_ios()
1121 	tsk->plug = plug;  in blk_start_plug_nr_ios()
1126  * @plug:	The &struct blk_plug that needs to be initialized
1144  *   plug. By flushing the pending I/O when the process goes to sleep, we avoid
1147 void blk_start_plug(struct blk_plug *plug)  in blk_start_plug()  argument
1149 	blk_start_plug_nr_ios(plug, 1);  in blk_start_plug()
1153 static void flush_plug_callbacks(struct blk_plug *plug, bool from_schedule)  in flush_plug_callbacks()  argument
1157 	while (!list_empty(&plug->cb_list)) {  in flush_plug_callbacks()
1158 		list_splice_init(&plug->cb_list, &callbacks);  in flush_plug_callbacks()
1173 	struct blk_plug *plug = current->plug;  in blk_check_plugged()  local
1176 	if (!plug)  in blk_check_plugged()
1179 	list_for_each_entry(cb, &plug->cb_list, list)  in blk_check_plugged()
1189 		list_add(&cb->list, &plug->cb_list);  in blk_check_plugged()
1195 void __blk_flush_plug(struct blk_plug *plug, bool from_schedule)  in __blk_flush_plug()  argument
1197 	if (!list_empty(&plug->cb_list))  in __blk_flush_plug()
1198 		flush_plug_callbacks(plug, from_schedule);  in __blk_flush_plug()
1199 	blk_mq_flush_plug_list(plug, from_schedule);  in __blk_flush_plug()
1206 	if (unlikely(!rq_list_empty(plug->cached_rq)))  in __blk_flush_plug()
1207 		blk_mq_free_plug_rqs(plug);  in __blk_flush_plug()
1209 	plug->cur_ktime = 0;  in __blk_flush_plug()
1215  * @plug:	The &struct blk_plug passed to blk_start_plug()
1223 void blk_finish_plug(struct blk_plug *plug)  in blk_finish_plug()  argument
1225 	if (plug == current->plug) {  in blk_finish_plug()
1226 		__blk_flush_plug(plug, false);  in blk_finish_plug()
1227 		current->plug = NULL;  in blk_finish_plug()