From patchwork Thu Jun 16 13:18:26 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Emanuele Giuseppe Esposito X-Patchwork-Id: 1644355 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=QEE/dwOj; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) 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 bilbo.ozlabs.org (Postfix) with ESMTPS id 4LP3Tj13vPz9sGC for ; Thu, 16 Jun 2022 23:50:33 +1000 (AEST) Received: from localhost ([::1]:48774 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1o1ptG-00009y-K8 for incoming@patchwork.ozlabs.org; Thu, 16 Jun 2022 09:50:30 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:51720) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1o1pOd-0005Gz-UW for qemu-devel@nongnu.org; Thu, 16 Jun 2022 09:18:53 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:35944) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1o1pOX-0007YJ-UW for qemu-devel@nongnu.org; Thu, 16 Jun 2022 09:18:50 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1655385524; 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=fSUG+Aw59HhVJh1BwDh3GO72alJ9E2h831UyMXoZIZY=; b=QEE/dwOjsw8nmvc42TLQEIAoNd6BstT8PWZSu0ZXXGecZeZ6eeyfjfRLEOz4K3lNvBkH3E lj8iySZQwsa9PJZ8GpRrVhuqwebghWArViiaIZNapCMz7oKwkns07IBNoQXMHmrHND/wYV hXiyk6uCZ/O38K3brDEv7rp2ivDRtH0= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-367-3ZwYuYWnMqWYlgFusUxXHg-1; Thu, 16 Jun 2022 09:18:41 -0400 X-MC-Unique: 3ZwYuYWnMqWYlgFusUxXHg-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id BDB70801756; Thu, 16 Jun 2022 13:18:40 +0000 (UTC) Received: from virtlab701.virt.lab.eng.bos.redhat.com (virtlab701.virt.lab.eng.bos.redhat.com [10.19.152.228]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6C7B640334E; Thu, 16 Jun 2022 13:18:40 +0000 (UTC) From: Emanuele Giuseppe Esposito To: 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, Emanuele Giuseppe Esposito Subject: [PATCH v7 09/18] block/mirror.c: use of job helpers in drivers to avoid TOC/TOU Date: Thu, 16 Jun 2022 09:18:26 -0400 Message-Id: <20220616131835.2004262-10-eesposit@redhat.com> In-Reply-To: <20220616131835.2004262-1-eesposit@redhat.com> References: <20220616131835.2004262-1-eesposit@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.10 Received-SPF: pass client-ip=170.10.129.124; envelope-from=eesposit@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, 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, 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Once job lock is used and aiocontext is removed, mirror has to perform job operations under the same critical section, using the helpers prepared in previous commit. Note: at this stage, job_{lock/unlock} and job lock guard macros are *nop*. Signed-off-by: Emanuele Giuseppe Esposito Reviewed-by: Stefan Hajnoczi --- block/mirror.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/block/mirror.c b/block/mirror.c index d8ecb9efa2..f5c6bac24f 100644 --- a/block/mirror.c +++ b/block/mirror.c @@ -654,9 +654,13 @@ static int mirror_exit_common(Job *job) BlockDriverState *target_bs; BlockDriverState *mirror_top_bs; Error *local_err = NULL; - bool abort = job->ret < 0; + bool abort; int ret = 0; + WITH_JOB_LOCK_GUARD() { + abort = job->ret < 0; + } + if (s->prepared) { return 0; } @@ -1152,8 +1156,10 @@ static void mirror_complete(Job *job, Error **errp) s->should_complete = true; /* If the job is paused, it will be re-entered when it is resumed */ - if (!job->paused) { - job_enter(job); + WITH_JOB_LOCK_GUARD() { + if (!job->paused) { + job_enter_cond(job, NULL); + } } } @@ -1173,8 +1179,11 @@ static bool mirror_drained_poll(BlockJob *job) * from one of our own drain sections, to avoid a deadlock waiting for * ourselves. */ - if (!s->common.job.paused && !job_is_cancelled(&job->job) && !s->in_drain) { - return true; + WITH_JOB_LOCK_GUARD() { + if (!s->common.job.paused && !job_is_cancelled_locked(&job->job) + && !s->in_drain) { + return true; + } } return !!s->in_flight;