C++ (Cpp) elv_rq_merge_ok Examples

Example #1

static int
deadline_merge(request_queue_t *q, struct request **req, struct bio *bio)
{
	struct deadline_data *dd = q->elevator->elevator_data;
	struct request *__rq;
	int ret;

	/*
	 * try last_merge to avoid going to hash
	 */
	ret = elv_try_last_merge(q, bio);
	if (ret != ELEVATOR_NO_MERGE) {
		__rq = q->last_merge;
		goto out_insert;
	}

	/*
	 * see if the merge hash can satisfy a back merge
	 */
	__rq = deadline_find_drq_hash(dd, bio->bi_sector);
	if (__rq) {
		BUG_ON(__rq->sector + __rq->nr_sectors != bio->bi_sector);

		if (elv_rq_merge_ok(__rq, bio)) {
			ret = ELEVATOR_BACK_MERGE;
			goto out;
		}
	}

	/*
	 * check for front merge
	 */
	if (dd->front_merges) {
		sector_t rb_key = bio->bi_sector + bio_sectors(bio);

		__rq = deadline_find_drq_rb(dd, rb_key, bio_data_dir(bio));
		if (__rq) {
			BUG_ON(rb_key != rq_rb_key(__rq));

			if (elv_rq_merge_ok(__rq, bio)) {
				ret = ELEVATOR_FRONT_MERGE;
				goto out;
			}
		}
	}

	return ELEVATOR_NO_MERGE;
out:
	q->last_merge = __rq;
out_insert:
	if (ret)
		deadline_hot_drq_hash(dd, RQ_DATA(__rq));
	*req = __rq;
	return ret;
}

Example #2

static int
deadline_merge(struct request_queue *q, struct request **req, struct bio *bio)
{
	struct deadline_data *dd = q->elevator->elevator_data;
	struct request *__rq;
	int ret;

	/*
	 * check for front merge
	 */
	if (dd->front_merges) {
		sector_t sector = bio->bi_sector + bio_sectors(bio);

		__rq = elv_rb_find(&dd->sort_list[bio_data_dir(bio)], sector);
		if (__rq) {
			BUG_ON(sector != blk_rq_pos(__rq));

			if (elv_rq_merge_ok(__rq, bio)) {
				ret = ELEVATOR_FRONT_MERGE;
				goto out;
			}
		}
	}

	return ELEVATOR_NO_MERGE;
out:
	*req = __rq;
	return ret;
}

Example #3

static int
vr_merge(struct request_queue *q, struct request **rqp, struct bio *bio)
{
sector_t sector = bio->bi_sector + bio_sectors(bio);
struct vr_data *vd = vr_get_data(q);
struct request *rq = elv_rb_find(&vd->sort_list, sector);

if (rq && elv_rq_merge_ok(rq, bio)) {
*rqp = rq;
return ELEVATOR_FRONT_MERGE;
}
return ELEVATOR_NO_MERGE;
}

Example #4

File: fiops-iosched.c Project: Minia89/Note-3-AEL-Kernel-SM-N9005_EUR_LL_Opensource_Update2.

static int fiops_merge(struct request_queue *q, struct request **req,
		     struct bio *bio)
{
	struct fiops_data *fiopsd = q->elevator->elevator_data;
	struct request *__rq;

	__rq = fiops_find_rq_fmerge(fiopsd, bio);
	if (__rq && elv_rq_merge_ok(__rq, bio)) {
		*req = __rq;
		return ELEVATOR_FRONT_MERGE;
	}

	return ELEVATOR_NO_MERGE;
}