From patchwork Mon Jun 5 15:59:18 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 9766411 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id EBACD6034B for ; Mon, 5 Jun 2017 16:01:41 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DD49D283CB for ; Mon, 5 Jun 2017 16:01:41 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D05FB283C6; Mon, 5 Jun 2017 16:01:41 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 62037283C0 for ; Mon, 5 Jun 2017 16:01:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751182AbdFEQBk (ORCPT ); Mon, 5 Jun 2017 12:01:40 -0400 Received: from mx1.redhat.com ([209.132.183.28]:32204 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751170AbdFEQBk (ORCPT ); Mon, 5 Jun 2017 12:01:40 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id F3F0781F01; Mon, 5 Jun 2017 16:01:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com F3F0781F01 Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=ming.lei@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com F3F0781F01 Received: from localhost (ovpn-12-72.pek2.redhat.com [10.72.12.72]) by smtp.corp.redhat.com (Postfix) with ESMTP id EB4A217C05; Mon, 5 Jun 2017 16:01:05 +0000 (UTC) From: Ming Lei To: Jens Axboe , linux-block@vger.kernel.org, Christoph Hellwig Cc: Bart Van Assche , Ming Lei Subject: [PATCH v4 04/11] blk-mq: introduce blk_mq_unquiesce_queue Date: Mon, 5 Jun 2017 23:59:18 +0800 Message-Id: <20170605155925.7896-5-ming.lei@redhat.com> In-Reply-To: <20170605155925.7896-1-ming.lei@redhat.com> References: <20170605155925.7896-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Mon, 05 Jun 2017 16:01:40 +0000 (UTC) Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP blk_mq_start_stopped_hw_queues() is used implictely as counterpart of blk_mq_quiesce_queue() for unquiescing queue, so we introduce blk_mq_unquiesce_queue() and make it as counterpart of blk_mq_quiesce_queue() explicitely. This function is for improving the current quiescing mechanism in the following patches. Signed-off-by: Ming Lei Reviewed-by: Bart Van Assche --- block/blk-mq.c | 13 +++++++++++++ include/linux/blk-mq.h | 1 + 2 files changed, 14 insertions(+) diff --git a/block/blk-mq.c b/block/blk-mq.c index 2da2cb8d9ff4..068962789dc4 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() - counterpart 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/blk-mq.h b/include/linux/blk-mq.h index 13d1196f492f..fc0fc45fc658 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -248,6 +248,7 @@ void blk_mq_start_hw_queues(struct request_queue *q); void blk_mq_start_stopped_hw_queue(struct blk_mq_hw_ctx *hctx, bool async); void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async); void blk_mq_quiesce_queue(struct request_queue *q); +void blk_mq_unquiesce_queue(struct request_queue *q); void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs); void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async); void blk_mq_run_hw_queues(struct request_queue *q, bool async);