From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:45306 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S941653AbdEYEVp (ORCPT ); Thu, 25 May 2017 00:21:45 -0400 From: Ming Lei To: Jens Axboe , linux-block@vger.kernel.org, Christoph Hellwig Cc: Bart Van Assche Subject: [PATCH 1/7] blk-mq: introduce blk_mq_unquiesce_queue Date: Thu, 25 May 2017 12:21:25 +0800 Message-Id: <20170525042131.13172-2-ming.lei@redhat.com> In-Reply-To: <20170525042131.13172-1-ming.lei@redhat.com> References: <20170525042131.13172-1-ming.lei@redhat.com> Sender: linux-block-owner@vger.kernel.org List-Id: linux-block@vger.kernel.org blk_mq_unquiesce_queue() is introduced to for rewriting the current quiescing mechanism, which will be done 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..a26fee3fb389 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 + * 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