From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bart Van Assche Subject: [PATCH v11 1/7] block: Make q_usage_counter also track legacy requests Date: Mon, 30 Oct 2017 15:41:59 -0700 Message-ID: <20171030224205.25212-2-bart.vanassche@wdc.com> References: <20171030224205.25212-1-bart.vanassche@wdc.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from esa4.hgst.iphmx.com ([216.71.154.42]:25300 "EHLO esa4.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752492AbdJ3WmJ (ORCPT ); Mon, 30 Oct 2017 18:42:09 -0400 In-Reply-To: <20171030224205.25212-1-bart.vanassche@wdc.com> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: Jens Axboe Cc: linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, Christoph Hellwig , "Martin K . Petersen" , Oleksandr Natalenko , Ming Lei , Martin Steigerwald , Bart Van Assche From: Ming Lei This patch makes it possible to pause request allocation for the legacy block layer by calling blk_mq_freeze_queue() and blk_mq_unfreeze_queue(). Signed-off-by: Ming Lei [ bvanassche: Combined two patches into one, edited a comment and made sure REQ_NOWAIT is handled properly in blk_old_get_request() ] Signed-off-by: Bart Van Assche Reviewed-by: Christoph Hellwig Reviewed-by: Johannes Thumshirn Reviewed-by: Hannes Reinecke Tested-by: Martin Steigerwald Cc: Ming Lei --- block/blk-core.c | 12 ++++++++++++ block/blk-mq.c | 10 ++-------- 2 files changed, 14 insertions(+), 8 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index bb4fce694a60..ec4eafb5af9f 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -611,6 +611,9 @@ void blk_set_queue_dying(struct request_queue *q) } spin_unlock_irq(q->queue_lock); } + + /* Make blk_queue_enter() reexamine the DYING flag. */ + wake_up_all(&q->mq_freeze_wq); } EXPORT_SYMBOL_GPL(blk_set_queue_dying); @@ -1397,16 +1400,22 @@ static struct request *blk_old_get_request(struct request_queue *q, unsigned int op, gfp_t gfp_mask) { struct request *rq; + int ret = 0; WARN_ON_ONCE(q->mq_ops); /* create ioc upfront */ create_io_context(gfp_mask, q->node); + ret = blk_queue_enter(q, !(gfp_mask & __GFP_DIRECT_RECLAIM) || + (op & REQ_NOWAIT)); + if (ret) + return ERR_PTR(ret); spin_lock_irq(q->queue_lock); rq = get_request(q, op, NULL, gfp_mask); if (IS_ERR(rq)) { spin_unlock_irq(q->queue_lock); + blk_queue_exit(q); return rq; } @@ -1578,6 +1587,7 @@ void __blk_put_request(struct request_queue *q, struct request *req) blk_free_request(rl, req); freed_request(rl, sync, rq_flags); blk_put_rl(rl); + blk_queue_exit(q); } } EXPORT_SYMBOL_GPL(__blk_put_request); @@ -1859,8 +1869,10 @@ static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio) * Grab a free request. This is might sleep but can not fail. * Returns with the queue unlocked. */ + blk_queue_enter_live(q); req = get_request(q, bio->bi_opf, bio, GFP_NOIO); if (IS_ERR(req)) { + blk_queue_exit(q); __wbt_done(q->rq_wb, wb_acct); if (PTR_ERR(req) == -ENOMEM) bio->bi_status = BLK_STS_RESOURCE; diff --git a/block/blk-mq.c b/block/blk-mq.c index 097ca3ece716..59b7de6b616b 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -125,7 +125,8 @@ void blk_freeze_queue_start(struct request_queue *q) freeze_depth = atomic_inc_return(&q->mq_freeze_depth); if (freeze_depth == 1) { percpu_ref_kill(&q->q_usage_counter); - blk_mq_run_hw_queues(q, false); + if (q->mq_ops) + blk_mq_run_hw_queues(q, false); } } EXPORT_SYMBOL_GPL(blk_freeze_queue_start); @@ -255,13 +256,6 @@ void blk_mq_wake_waiters(struct request_queue *q) queue_for_each_hw_ctx(q, hctx, i) if (blk_mq_hw_queue_mapped(hctx)) blk_mq_tag_wakeup_all(hctx->tags, true); - - /* - * If we are called because the queue has now been marked as - * dying, we need to ensure that processes currently waiting on - * the queue are notified as well. - */ - wake_up_all(&q->mq_freeze_wq); } bool blk_mq_can_queue(struct blk_mq_hw_ctx *hctx) -- 2.14.2