From patchwork Wed Mar 1 19:22:10 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Keith Busch X-Patchwork-Id: 9598983 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 8DA5160429 for ; Wed, 1 Mar 2017 19:14:37 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7942427317 for ; Wed, 1 Mar 2017 19:14:37 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6DC1727FA8; Wed, 1 Mar 2017 19:14:37 +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 087212756B for ; Wed, 1 Mar 2017 19:14:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752794AbdCATOe (ORCPT ); Wed, 1 Mar 2017 14:14:34 -0500 Received: from mga01.intel.com ([192.55.52.88]:52303 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752583AbdCATOd (ORCPT ); Wed, 1 Mar 2017 14:14:33 -0500 Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 01 Mar 2017 11:14:03 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.35,226,1484035200"; d="scan'208";a="71660063" Received: from unknown (HELO localhost.lm.intel.com) ([10.232.112.96]) by fmsmga006.fm.intel.com with ESMTP; 01 Mar 2017 11:14:03 -0800 From: Keith Busch To: Jens Axboe , Sagi Grimberg , Christoph Hellwig , linux-nvme@lists.infradead.org, linux-block@vger.kernel.org Cc: Marc MERLIN , Jens Axboe , Keith Busch Subject: [PATCH 1/3] blk-mq: Export blk_mq_freeze_queue_wait Date: Wed, 1 Mar 2017 14:22:10 -0500 Message-Id: <1488396132-11369-2-git-send-email-keith.busch@intel.com> X-Mailer: git-send-email 2.5.5 In-Reply-To: <1488396132-11369-1-git-send-email-keith.busch@intel.com> References: <1488396132-11369-1-git-send-email-keith.busch@intel.com> 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 Drivers can start a freeze, so this provides a way to wait for frozen. Signed-off-by: Keith Busch Reviewed-by: Christoph Hellwig Signed-off-by: Sagi Grimberg --- block/blk-mq.c | 3 ++- include/linux/blk-mq.h | 1 + 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index 94593c6..8da2c04 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -75,10 +75,11 @@ void blk_mq_freeze_queue_start(struct request_queue *q) } EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_start); -static void blk_mq_freeze_queue_wait(struct request_queue *q) +void blk_mq_freeze_queue_wait(struct request_queue *q) { wait_event(q->mq_freeze_wq, percpu_ref_is_zero(&q->q_usage_counter)); } +EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_wait); /* * Guarantee no request is in use, so we can change any data structure of diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 001d30d..8dacf68 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -245,6 +245,7 @@ void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset, void blk_mq_freeze_queue(struct request_queue *q); void blk_mq_unfreeze_queue(struct request_queue *q); void blk_mq_freeze_queue_start(struct request_queue *q); +void blk_mq_freeze_queue_wait(struct request_queue *q); int blk_mq_reinit_tagset(struct blk_mq_tag_set *set); int blk_mq_map_queues(struct blk_mq_tag_set *set);