From nobody Mon Apr 7 21:48:42 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1665148391; cv=none; d=zohomail.com; s=zohoarc; b=HWlB/xaTDhPoFPb+ZaVwj0Lfr9QCoVrBh9HLXfTt8ZjXURU9fJg1fXk8epcEmV6OSN48R/+wUsimJ01j/ngFPWopl8v9S2kn+tSa0ZWS9fMw9lDbxnTaFrkJ1jAhvkqJ9orpOcY5x+h/44PcLsYITz8imHp5x+YXW1/nquD6wB8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1665148391; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=SXOprbof5ZzjV+Qg8oww6F0SLAFGGrPH06mQ6uz1py0=; b=Syys9jFRTTmmEqHfwkB4VQTUQbRezP0sYK6aBVAaocXitW3pBrqd5OekFcYPvk66SR0/BZ+BwYAEgpEcGbHDYWrAkoMy95bn/jZeOFYW3PX6CEK8wcC9QvoE6q26wXL+R355Akqc6e76UTEdCBn1KvbcjKR/Rv+QM7Nfu587N48= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1665148391930876.3080870383482; Fri, 7 Oct 2022 06:13:11 -0700 (PDT) Received: from localhost ([::1]:56940 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ognA6-00037S-FD for importer@patchew.org; Fri, 07 Oct 2022 09:13:10 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:38228) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ogkuO-0005zJ-Rl for qemu-devel@nongnu.org; Fri, 07 Oct 2022 06:48:49 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:42241) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ogkuN-0003Jk-77 for qemu-devel@nongnu.org; Fri, 07 Oct 2022 06:48:48 -0400 Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-194-Z3ykn96vP0-gS1cYgi5G8g-1; Fri, 07 Oct 2022 06:48:45 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 358CC3826244; Fri, 7 Oct 2022 10:48:45 +0000 (UTC) Received: from merkur.fritz.box (unknown [10.39.192.109]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7543A2024CBB; Fri, 7 Oct 2022 10:48:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1665139726; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=SXOprbof5ZzjV+Qg8oww6F0SLAFGGrPH06mQ6uz1py0=; b=aydGLN8YXf40GEFdeiEJ+glwsjq2bmumEZ0mWCnmQxTfUz5d1VYPo/Fw0e6yWLoeeEU17+ hM5sSStNbmIYfO8zTBgUfbXt9+JkBAH8R8mFummAkPHIp+ZryxvOjekr3477imc98/d5D+ fUkCU0tdwMCIgdf2IEFLRef14jEiadc= X-MC-Unique: Z3ykn96vP0-gS1cYgi5G8g-1 From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, stefanha@redhat.com, qemu-devel@nongnu.org Subject: [PULL 45/50] job.h: categorize JobDriver callbacks that need the AioContext lock Date: Fri, 7 Oct 2022 12:47:47 +0200 Message-Id: <20221007104752.141361-46-kwolf@redhat.com> In-Reply-To: <20221007104752.141361-1-kwolf@redhat.com> References: <20221007104752.141361-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com 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, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1665148394290100001 Content-Type: text/plain; charset="utf-8" From: Emanuele Giuseppe Esposito Some callbacks implementation use bdrv_* APIs that assume the AioContext lock is held. Make sure this invariant is documented. Signed-off-by: Emanuele Giuseppe Esposito Reviewed-by: Vladimir Sementsov-Ogievskiy Message-Id: <20220926093214.506243-18-eesposit@redhat.com> Reviewed-by: Kevin Wolf Signed-off-by: Kevin Wolf --- include/qemu/job.h | 27 +++++++++++++++++++++++++-- 1 file changed, 25 insertions(+), 2 deletions(-) diff --git a/include/qemu/job.h b/include/qemu/job.h index c96387069d..b943d90e8f 100644 --- a/include/qemu/job.h +++ b/include/qemu/job.h @@ -65,7 +65,11 @@ typedef struct Job { /** True if this job should automatically dismiss itself */ bool auto_dismiss; =20 - /** The completion function that will be called when the job completes= . */ + /** + * The completion function that will be called when the job completes. + * Called with AioContext lock held, since many callback implementatio= ns + * use bdrv_* functions that require to hold the lock. + */ BlockCompletionFunc *cb; =20 /** The opaque value that is passed to the completion function. */ @@ -260,6 +264,9 @@ struct JobDriver { * * This callback will not be invoked if the job has already failed. * If it fails, abort and then clean will be called. + * + * Called with AioContext lock held, since many callbacs implementatio= ns + * use bdrv_* functions that require to hold the lock. */ int (*prepare)(Job *job); =20 @@ -270,6 +277,9 @@ struct JobDriver { * * All jobs will complete with a call to either .commit() or .abort() = but * never both. + * + * Called with AioContext lock held, since many callback implementatio= ns + * use bdrv_* functions that require to hold the lock. */ void (*commit)(Job *job); =20 @@ -280,6 +290,9 @@ struct JobDriver { * * All jobs will complete with a call to either .commit() or .abort() = but * never both. + * + * Called with AioContext lock held, since many callback implementatio= ns + * use bdrv_* functions that require to hold the lock. */ void (*abort)(Job *job); =20 @@ -288,6 +301,9 @@ struct JobDriver { * .commit() or .abort(). Regardless of which callback is invoked after * completion, .clean() will always be called, even if the job does not * belong to a transaction group. + * + * Called with AioContext lock held, since many callbacs implementatio= ns + * use bdrv_* functions that require to hold the lock. */ void (*clean)(Job *job); =20 @@ -302,11 +318,18 @@ struct JobDriver { * READY). * (If the callback is NULL, the job is assumed to terminate * without I/O.) + * + * Called with AioContext lock held, since many callback implementatio= ns + * use bdrv_* functions that require to hold the lock. */ bool (*cancel)(Job *job, bool force); =20 =20 - /** Called when the job is freed */ + /** + * Called when the job is freed. + * Called with AioContext lock held, since many callback implementatio= ns + * use bdrv_* functions that require to hold the lock. + */ void (*free)(Job *job); }; =20 --=20 2.37.3