488 	struct bio *tail;  member
498 	bl->head = bl->tail = NULL;  in bio_list_init()
521 	if (bl->tail)  in bio_list_add()
522 		bl->tail->bi_next = bio;  in bio_list_add()
526 	bl->tail = bio;  in bio_list_add()
535 	if (!bl->tail)  in bio_list_add_head()
536 		bl->tail = bio;  in bio_list_add_head()
544 	if (bl->tail)  in bio_list_merge()
545 		bl->tail->bi_next = bl2->head;  in bio_list_merge()
549 	bl->tail = bl2->tail;  in bio_list_merge()
566 		bl2->tail->bi_next = bl->head;  in bio_list_merge_head()
568 		bl->tail = bl2->tail;  in bio_list_merge_head()
585 			bl->tail = NULL;  in bio_list_pop()
597 	bl->head = bl->tail = NULL;  in bio_list_get()