
static struct bfq_queue *bfq_get_bfqq_handle_split(struct bfq_data *bfqd,
						   struct bfq_io_cq *bic,
						   struct bio *bio,
						   bool split, bool is_sync,
						   bool *new_queue)
{
	struct bfq_queue *bfqq = bic_to_bfqq(bic, is_sync);

	if (likely(bfqq && bfqq != &bfqd->oom_bfqq))
		return bfqq;

	if (new_queue)
		*new_queue = true;

	if (bfqq)
		bfq_put_queue(bfqq);
	bfqq = bfq_get_queue(bfqd, bio, is_sync, bic);

	bic_set_bfqq(bic, bfqq, is_sync);
	if (split && is_sync) {
		if ((bic->was_in_burst_list && bfqd->large_burst) ||
		    bic->saved_in_large_burst)
			bfq_mark_bfqq_in_large_burst(bfqq);
		else {
			bfq_clear_bfqq_in_large_burst(bfqq);
			if (bic->was_in_burst_list)
				/*
				 * If bfqq was in the current
				 * burst list before being
				 * merged, then we have to add
				 * it back. And we do not need
				 * to increase burst_size, as
				 * we did not decrement
				 * burst_size when we removed
				 * bfqq from the burst list as
				 * a consequence of a merge
				 * (see comments in
				 * bfq_put_queue). In this
				 * respect, it would be rather
				 * costly to know whether the
				 * current burst list is still
				 * the same burst list from
				 * which bfqq was removed on
				 * the merge. To avoid this
				 * cost, if bfqq was in a
				 * burst list, then we add
				 * bfqq to the current burst
				 * list without any further
				 * check. This can cause
				 * inappropriate insertions,
				 * but rarely enough to not
				 * harm the detection of large
				 * bursts significantly.
				 */
				hlist_add_head(&bfqq->burst_list_node,
					       &bfqd->burst_list);
		}
		bfqq->split_time = jiffies;
	}

	return bfqq;