From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:41118 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752388AbdE0OVx (ORCPT ); Sat, 27 May 2017 10:21:53 -0400 From: Ming Lei To: Jens Axboe , linux-block@vger.kernel.org, Christoph Hellwig Cc: Bart Van Assche , Ming Lei Subject: [PATCH v2 1/8] blk-mq: introduce blk_mq_unquiesce_queue Date: Sat, 27 May 2017 22:21:19 +0800 Message-Id: <20170527142126.26079-2-ming.lei@redhat.com> In-Reply-To: <20170527142126.26079-1-ming.lei@redhat.com> References: <20170527142126.26079-1-ming.lei@redhat.com> Sender: linux-block-owner@vger.kernel.org List-Id: linux-block@vger.kernel.org We use blk_mq_start_stopped_hw_queues() implictely as pair of blk_mq_quiesce_queue() for unquiescing the queue, so we introduce blk_mq_unquiesce_queue() and make it as pair of blk_mq_quiesce_queue() explicitely. This function is for fixing current quiescing mechanism in the following patches. Signed-off-by: Ming Lei --- block/blk-mq.c | 13 +++++++++++++ include/linux/blkdev.h | 1 + 2 files changed, 14 insertions(+) diff --git a/block/blk-mq.c b/block/blk-mq.c index f2224ffd225d..8ecbbb718946 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -181,6 +181,19 @@ void blk_mq_quiesce_queue(struct request_queue *q) } EXPORT_SYMBOL_GPL(blk_mq_quiesce_queue); +/* + * blk_mq_unquiesce_queue() - pair of blk_mq_quiesce_queue() + * @q: request queue. + * + * This function recovers queue into the state before quiescing + * which is done by blk_mq_quiesce_queue. + */ +void blk_mq_unquiesce_queue(struct request_queue *q) +{ + blk_mq_start_stopped_hw_queues(q, true); +} +EXPORT_SYMBOL_GPL(blk_mq_unquiesce_queue); + void blk_mq_wake_waiters(struct request_queue *q) { struct blk_mq_hw_ctx *hctx; diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index ab92c4ea138b..41291be82ac4 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -964,6 +964,7 @@ extern void __blk_run_queue_uncond(struct request_queue *q); extern void blk_run_queue(struct request_queue *); extern void blk_run_queue_async(struct request_queue *q); extern void blk_mq_quiesce_queue(struct request_queue *q); +extern void blk_mq_unquiesce_queue(struct request_queue *q); extern int blk_rq_map_user(struct request_queue *, struct request *, struct rq_map_data *, void __user *, unsigned long, gfp_t); -- 2.9.4