From bd166ef183c263c5ced656d49ef19c7da4adc774 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Tue, 17 Jan 2017 06:03:22 -0700 Subject: blk-mq-sched: add framework for MQ capable IO schedulers This adds a set of hooks that intercepts the blk-mq path of allocating/inserting/issuing/completing requests, allowing us to develop a scheduler within that framework. We reuse the existing elevator scheduler API on the registration side, but augment that with the scheduler flagging support for the blk-mq interfce, and with a separate set of ops hooks for MQ devices. We split driver and scheduler tags, so we can run the scheduling independently of device queue depth. Signed-off-by: Jens Axboe Reviewed-by: Bart Van Assche Reviewed-by: Omar Sandoval --- block/blk-tag.c | 1 + 1 file changed, 1 insertion(+) (limited to 'block/blk-tag.c') diff --git a/block/blk-tag.c b/block/blk-tag.c index bae1decb6ec39..07cc329fa4b0a 100644 --- a/block/blk-tag.c +++ b/block/blk-tag.c @@ -272,6 +272,7 @@ void blk_queue_end_tag(struct request_queue *q, struct request *rq) list_del_init(&rq->queuelist); rq->rq_flags &= ~RQF_QUEUED; rq->tag = -1; + rq->internal_tag = -1; if (unlikely(bqt->tag_index[tag] == NULL)) printk(KERN_ERR "%s: tag %d is missing\n", -- cgit v1.2.3