> + } else if (plug && q->mq_ops->commit_rqs) {
> + /*
> + * If we have a ->commit_rqs(), then we know the driver can
> + * batch submission doorbell updates. Add rq to plug list,
> + * and flush if we exceed the plug count only.
> + */
> + blk_mq_bio_to_request(rq, bio);
> + blk_mq_put_ctx(data.ctx);
> +
> + /*
> + * If we have requests for more than one queue here, we
> + * should sort the list when it's flushed.
> + */
> + if (!plug->do_sort && !list_empty(&plug->mq_list)) {
> + same_queue_rq = list_first_entry(&plug->mq_list,
> + struct request, queuelist);
> + if (same_queue_rq->q != q)
> + plug->do_sort = true;
> + }
> +
> + list_add_tail(&rq->queuelist, &plug->mq_list);
> + plug->rq_count++;
> + if (plug->rq_count >= BLK_MAX_REQUEST_COUNT) {
> + blk_flush_plug_list(plug, false);
> + trace_block_plug(q);
> + }
This seems like a slight variation of the the single queue plug
case. Can we share the code instead of having slightly differing
logic?
Also that should this respect blk_queue_nomerges?
