From bf57229745f849e500ba69ff91e35bc8160a7373 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Sat, 13 Sep 2014 16:40:08 -0700 Subject: blk-mq: remove REQ_END Pass an explicit parameter for the last request in a batch to ->queue_rq instead of using a request flag. Besides being a cleaner and non-stateful interface this is also required for the next patch, which fixes the blk-mq I/O submission code to not start a time too early. Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe --- block/blk-mq.c | 22 +++++----------------- 1 file changed, 5 insertions(+), 17 deletions(-) (limited to 'block/blk-mq.c') diff --git a/block/blk-mq.c b/block/blk-mq.c index e743d28620b2..32b4797f4186 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -384,7 +384,7 @@ void blk_mq_complete_request(struct request *rq) } EXPORT_SYMBOL(blk_mq_complete_request); -static void blk_mq_start_request(struct request *rq, bool last) +static void blk_mq_start_request(struct request *rq) { struct request_queue *q = rq->q; @@ -421,16 +421,6 @@ static void blk_mq_start_request(struct request *rq, bool last) */ rq->nr_phys_segments++; } - - /* - * Flag the last request in the series so that drivers know when IO - * should be kicked off, if they don't do it on a per-request basis. - * - * Note: the flag isn't the only condition drivers should do kick off. - * If drive is busy, the last request might not have the bit set. - */ - if (last) - rq->cmd_flags |= REQ_END; } static void __blk_mq_requeue_request(struct request *rq) @@ -440,8 +430,6 @@ static void __blk_mq_requeue_request(struct request *rq) trace_block_rq_requeue(q, rq); clear_bit(REQ_ATOM_STARTED, &rq->atomic_flags); - rq->cmd_flags &= ~REQ_END; - if (q->dma_drain_size && blk_rq_bytes(rq)) rq->nr_phys_segments--; } @@ -755,9 +743,9 @@ static void __blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx) rq = list_first_entry(&rq_list, struct request, queuelist); list_del_init(&rq->queuelist); - blk_mq_start_request(rq, list_empty(&rq_list)); + blk_mq_start_request(rq); - ret = q->mq_ops->queue_rq(hctx, rq); + ret = q->mq_ops->queue_rq(hctx, rq, list_empty(&rq_list)); switch (ret) { case BLK_MQ_RQ_QUEUE_OK: queued++; @@ -1198,14 +1186,14 @@ static void blk_mq_make_request(struct request_queue *q, struct bio *bio) int ret; blk_mq_bio_to_request(rq, bio); - blk_mq_start_request(rq, true); + blk_mq_start_request(rq); /* * For OK queue, we are done. For error, kill it. Any other * error (busy), just add it to our list as we previously * would have done */ - ret = q->mq_ops->queue_rq(data.hctx, rq); + ret = q->mq_ops->queue_rq(data.hctx, rq, true); if (ret == BLK_MQ_RQ_QUEUE_OK) goto done; else { -- cgit v1.2.3