From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6EA31C433EF for ; Mon, 11 Jul 2022 12:21:41 +0000 (UTC) Received: from localhost ([::1]:41916 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oAsQ0-0001As-9J for qemu-devel@archiver.kernel.org; Mon, 11 Jul 2022 08:21:40 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:44634) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oAsP4-0000N7-4N; Mon, 11 Jul 2022 08:20:42 -0400 Received: from forwardcorp1p.mail.yandex.net ([2a02:6b8:0:1472:2741:0:8b6:217]:56590) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oAsP0-0000lK-NJ; Mon, 11 Jul 2022 08:20:40 -0400 Received: from myt5-70c90f7d6d7d.qloud-c.yandex.net (myt5-70c90f7d6d7d.qloud-c.yandex.net [IPv6:2a02:6b8:c12:3e2c:0:640:70c9:f7d]) by forwardcorp1p.mail.yandex.net (Yandex) with ESMTP id 0C3A82E124D; Mon, 11 Jul 2022 15:20:26 +0300 (MSK) Received: from [10.211.6.101] (10.211.6.101-vpn.dhcp.yndx.net [10.211.6.101]) by myt5-70c90f7d6d7d.qloud-c.yandex.net (smtpcorp/Yandex) with ESMTPSA id wdKAuneg6s-KNOie6lo; Mon, 11 Jul 2022 15:20:25 +0300 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (Client certificate not present) X-Yandex-Fwd: 1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex-team.ru; s=default; t=1657542025; bh=K9XAOGmqCYS27ANsaq+t9mNFdyfHrPMlpbPzfVqsbRw=; h=From:In-Reply-To:Cc:Date:References:To:Subject:Message-ID; b=mGD/ImbIrtYIahDbL3UMa0LWmwMxYMWBEFPqRSUGrhFqCNZxM4X/RdwIsqAFBP1EI arK/h+mYe6swSTXzABqmMe3/gMoaB64epm9ckjWNsyXfVG0AWHmQh8BuJgC3jh3iZL iYBi2B6bKL7yuCX6prpokn2WrrJmdFNytAIJ/B00= Authentication-Results: myt5-70c90f7d6d7d.qloud-c.yandex.net; dkim=pass header.i=@yandex-team.ru Message-ID: Date: Mon, 11 Jul 2022 15:20:23 +0300 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.8.1 Subject: Re: [PATCH v9 08/21] jobs: add job lock in find_* functions Content-Language: en-US To: Emanuele Giuseppe Esposito , qemu-block@nongnu.org Cc: Kevin Wolf , Hanna Reitz , Paolo Bonzini , John Snow , Vladimir Sementsov-Ogievskiy , Wen Congyang , Xie Changlong , Markus Armbruster , Stefan Hajnoczi , Fam Zheng , qemu-devel@nongnu.org References: <20220706201533.289775-1-eesposit@redhat.com> <20220706201533.289775-9-eesposit@redhat.com> From: Vladimir Sementsov-Ogievskiy In-Reply-To: <20220706201533.289775-9-eesposit@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2a02:6b8:0:1472:2741:0:8b6:217; envelope-from=vsementsov@yandex-team.ru; helo=forwardcorp1p.mail.yandex.net X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 7/6/22 23:15, Emanuele Giuseppe Esposito wrote: > Both blockdev.c and job-qmp.c have TOC/TOU conditions, because > they first search for the job and then perform an action on it. > Therefore, we need to do the search + action under the same > job mutex critical section. > > Note: at this stage, job_{lock/unlock} and job lock guard macros > are*nop*. > > Signed-off-by: Emanuele Giuseppe Esposito > Reviewed-by: Stefan Hajnoczi Reviewed-by: Vladimir Sementsov-Ogievskiy -- Best regards, Vladimir