Function bioq_takefirst

freebsd/kern/subr_disk.c:218–227

}

struct bio *
bioq_takefirst(struct bio_queue_head *head)
{
	struct bio *bp;

	bp = TAILQ_FIRST(&head->queue);
	if (bp != NULL)
		bioq_remove(head, bp);
	return (bp);
}

/*
 * Compute the sorting key. The cast to unsigned is