597 	struct bio *head;  member
603 	return bl->head == NULL;  in bio_list_empty()
608 	bl->head = bl->tail = NULL;  in bio_list_init()
614 	for (bio = (bl)->head; bio; bio = bio->bi_next)
634 		bl->head = bio;  in bio_list_add()
641 	bio->bi_next = bl->head;  in bio_list_add_head()
643 	bl->head = bio;  in bio_list_add_head()
651 	if (!bl2->head)  in bio_list_merge()
655 		bl->tail->bi_next = bl2->head;  in bio_list_merge()
657 		bl->head = bl2->head;  in bio_list_merge()
665 	if (!bl2->head)  in bio_list_merge_head()
668 	if (bl->head)  in bio_list_merge_head()
669 		bl2->tail->bi_next = bl->head;  in bio_list_merge_head()
673 	bl->head = bl2->head;  in bio_list_merge_head()
678 	return bl->head;  in bio_list_peek()
683 	struct bio *bio = bl->head;  in bio_list_pop()
686 		bl->head = bl->head->bi_next;  in bio_list_pop()
687 		if (!bl->head)  in bio_list_pop()
698 	struct bio *bio = bl->head;  in bio_list_get()
700 	bl->head = bl->tail = NULL;  in bio_list_get()