From patchwork Fri Mar 12 15:44:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergei Shtepa X-Patchwork-Id: 12135033 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 63E55C4332D for ; Fri, 12 Mar 2021 15:46:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2E58264FDD for ; Fri, 12 Mar 2021 15:46:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232778AbhCLPpl (ORCPT ); Fri, 12 Mar 2021 10:45:41 -0500 Received: from mx4.veeam.com ([104.41.138.86]:49948 "EHLO mx4.veeam.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232583AbhCLPpV (ORCPT ); Fri, 12 Mar 2021 10:45:21 -0500 Received: from mail.veeam.com (prgmbx01.amust.local [172.24.0.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx4.veeam.com (Postfix) with ESMTPS id C04F1114A90; Fri, 12 Mar 2021 18:45:17 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=veeam.com; s=mx4; t=1615563917; bh=E7vklZS3KQKvlQW65s1wvDn6+2dH/1XjVlF3nm5Ihtk=; h=From:To:CC:Subject:Date:In-Reply-To:References:From; b=SdtDNGUABLkZFqgXedaW5RLH3FOTjPK8hBnQe3Hc/iMoyHErKJ+DD1rc8rjM7ouV6 TFcQ5frFhf4IULEwLTohxz51zG0cgCtZ35Jvvm8aHkszbiLwOhfPvPtrcDdBRUsPOy D9QdwhbxiQlJXnBSgkTajzEienrF87YoWlr/Qu8A= Received: from prgdevlinuxpatch01.amust.local (172.24.14.5) by prgmbx01.amust.local (172.24.0.171) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.721.2; Fri, 12 Mar 2021 16:45:15 +0100 From: Sergei Shtepa To: Christoph Hellwig , Mike Snitzer , Alasdair Kergon , Hannes Reinecke , Jens Axboe , , , , CC: , Subject: [PATCH v7 1/3] block: add blk_mq_is_queue_frozen() Date: Fri, 12 Mar 2021 18:44:53 +0300 Message-ID: <1615563895-28565-2-git-send-email-sergei.shtepa@veeam.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1615563895-28565-1-git-send-email-sergei.shtepa@veeam.com> References: <1615563895-28565-1-git-send-email-sergei.shtepa@veeam.com> MIME-Version: 1.0 X-Originating-IP: [172.24.14.5] X-ClientProxiedBy: prgmbx02.amust.local (172.24.0.172) To prgmbx01.amust.local (172.24.0.171) X-EsetResult: clean, is OK X-EsetId: 37303A29D2A50B58627366 X-Veeam-MMEX: True Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org blk_mq_is_queue_frozen() allow to assert that the queue is frozen. Signed-off-by: Sergei Shtepa --- 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 d4d7c1caa439..2f188a865024 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -161,6 +161,19 @@ int blk_mq_freeze_queue_wait_timeout(struct request_queue *q, } EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_wait_timeout); +bool blk_mq_is_queue_frozen(struct request_queue *q) +{ + bool frozen; + + mutex_lock(&q->mq_freeze_lock); + frozen = percpu_ref_is_dying(&q->q_usage_counter) && + percpu_ref_is_zero(&q->q_usage_counter); + mutex_unlock(&q->mq_freeze_lock); + + return frozen; +} +EXPORT_SYMBOL_GPL(blk_mq_is_queue_frozen); + /* * Guarantee no request is in use, so we can change any data structure of * the queue afterward. diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 2c473c9b8990..6f01971abf7b 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -533,6 +533,7 @@ void blk_freeze_queue_start(struct request_queue *q); void blk_mq_freeze_queue_wait(struct request_queue *q); int blk_mq_freeze_queue_wait_timeout(struct request_queue *q, unsigned long timeout); +bool blk_mq_is_queue_frozen(struct request_queue *q); int blk_mq_map_queues(struct blk_mq_queue_map *qmap); void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues);