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Wed, 09 Sep 2020 06:41:34 -0400 X-MC-Unique: K0bslsFSNtG_UABgBox2oQ-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E035D18B9EDD; Wed, 9 Sep 2020 10:41:32 +0000 (UTC) Received: from localhost (ovpn-12-76.pek2.redhat.com [10.72.12.76]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4C32810013D7; Wed, 9 Sep 2020 10:41:28 +0000 (UTC) From: Ming Lei To: Jens Axboe , linux-block@vger.kernel.org, linux-nvme@lists.infradead.org, Christoph Hellwig , Keith Busch Subject: [PATCH V4 1/4] block: use test_and_{clear|test}_bit to set/clear QUEUE_FLAG_QUIESCED Date: Wed, 9 Sep 2020 18:41:13 +0800 Message-Id: <20200909104116.1674592-2-ming.lei@redhat.com> In-Reply-To: <20200909104116.1674592-1-ming.lei@redhat.com> References: <20200909104116.1674592-1-ming.lei@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200909_064139_296122_525EF9C6 X-CRM114-Status: GOOD ( 17.37 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Johannes Thumshirn , Chao Leng , Sagi Grimberg , Bart Van Assche , Ming Lei Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org Prepare for replacing srcu with percpu-refcount for implementing queue quiesce. The following patch needs to avoid duplicated quiesce action for BLK_MQ_F_BLOCKING, so use test_and_{clear|test}_bit to set/clear QUEUE_FLAG_QUIESCED. Signed-off-by: Ming Lei Cc: Sagi Grimberg Cc: Bart Van Assche Cc: Johannes Thumshirn Cc: Chao Leng --- block/blk-core.c | 13 +++++++++++++ block/blk-mq.c | 11 ++++++++--- block/blk.h | 2 ++ 3 files changed, 23 insertions(+), 3 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index 093649bd252e..de440733609c 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -107,6 +107,19 @@ bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q) } EXPORT_SYMBOL_GPL(blk_queue_flag_test_and_set); +/** + * blk_queue_flag_test_and_clear - atomically test and clear a queue flag + * @flag: flag to be clear + * @q: request queue + * + * Returns the previous value of @flag - 0 if the flag was not set and 1 if + * the flag was set. + */ +bool blk_queue_flag_test_and_clear(unsigned int flag, struct request_queue *q) +{ + return test_and_clear_bit(flag, &q->queue_flags); +} + void blk_rq_init(struct request_queue *q, struct request *rq) { memset(rq, 0, sizeof(*rq)); diff --git a/block/blk-mq.c b/block/blk-mq.c index 4abb71459f94..efd17a80fcdf 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -199,13 +199,18 @@ void blk_mq_unfreeze_queue(struct request_queue *q) } EXPORT_SYMBOL_GPL(blk_mq_unfreeze_queue); +static bool __blk_mq_quiesce_queue_nowait(struct request_queue *q) +{ + return blk_queue_flag_test_and_set(QUEUE_FLAG_QUIESCED, q); +} + /* * FIXME: replace the scsi_internal_device_*block_nowait() calls in the * mpt3sas driver such that this function can be removed. */ void blk_mq_quiesce_queue_nowait(struct request_queue *q) { - blk_queue_flag_set(QUEUE_FLAG_QUIESCED, q); + __blk_mq_quiesce_queue_nowait(q); } EXPORT_SYMBOL_GPL(blk_mq_quiesce_queue_nowait); @@ -224,7 +229,7 @@ void blk_mq_quiesce_queue(struct request_queue *q) unsigned int i; bool rcu = false; - blk_mq_quiesce_queue_nowait(q); + __blk_mq_quiesce_queue_nowait(q); queue_for_each_hw_ctx(q, hctx, i) { if (hctx->flags & BLK_MQ_F_BLOCKING) @@ -246,7 +251,7 @@ EXPORT_SYMBOL_GPL(blk_mq_quiesce_queue); */ void blk_mq_unquiesce_queue(struct request_queue *q) { - blk_queue_flag_clear(QUEUE_FLAG_QUIESCED, q); + blk_queue_flag_test_and_clear(QUEUE_FLAG_QUIESCED, q); /* dispatch requests which are inserted during quiescing */ blk_mq_run_hw_queues(q, true); diff --git a/block/blk.h b/block/blk.h index c08762e10b04..312a060ea2a2 100644 --- a/block/blk.h +++ b/block/blk.h @@ -448,4 +448,6 @@ int bio_add_hw_page(struct request_queue *q, struct bio *bio, struct page *page, unsigned int len, unsigned int offset, unsigned int max_sectors, bool *same_page); +bool blk_queue_flag_test_and_clear(unsigned int flag, struct request_queue *q); + #endif /* BLK_INTERNAL_H */ -- 2.25.2 _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme