From patchwork Tue Apr 7 14:26:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 1267446 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org 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=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: 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=e9WDcjXE; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 48xV963kv6z9sSq for ; Wed, 8 Apr 2020 00:27:06 +1000 (AEST) Received: from localhost ([::1]:48202 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jLpBw-0000N7-Ge for incoming@patchwork.ozlabs.org; Tue, 07 Apr 2020 10:27:04 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:55126) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jLpBa-0000Kb-85 for qemu-devel@nongnu.org; Tue, 07 Apr 2020 10:26:43 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jLpBZ-0006tJ-5h for qemu-devel@nongnu.org; Tue, 07 Apr 2020 10:26:42 -0400 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:41011 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jLpBZ-0006t0-1Y for qemu-devel@nongnu.org; Tue, 07 Apr 2020 10:26:41 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1586269600; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=xxkNIPUSk68oKmOyRdypuozHb+nsPqyvaf9O6pCNozU=; b=e9WDcjXE1tY1tSMAuqNtUCO7wXrGXsLVLG7cpEjuKX8nQMMO5VcH6JSSr0nP62HsBWwy1G IZwnNWK9Q8WzBCYVE3UyaXDRby5EDUFlUr8QmTknHUKBtIdfoUsBYFCg9t0rhnWNh6vK7Z JCkudbIJqqsTpr6bYL9Z5M4Kpw1v1to= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-388-l6RWNUpBO6655txutobxDA-1; Tue, 07 Apr 2020 10:26:35 -0400 X-MC-Unique: l6RWNUpBO6655txutobxDA-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id F38DA800D53; Tue, 7 Apr 2020 14:26:33 +0000 (UTC) Received: from linux.fritz.box.com (ovpn-113-253.ams2.redhat.com [10.36.113.253]) by smtp.corp.redhat.com (Postfix) with ESMTP id F19E65DA60; Tue, 7 Apr 2020 14:26:32 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Subject: [PULL 3/7] backup: don't acquire aio_context in backup_clean Date: Tue, 7 Apr 2020 16:26:12 +0200 Message-Id: <20200407142616.7961-4-kwolf@redhat.com> In-Reply-To: <20200407142616.7961-1-kwolf@redhat.com> References: <20200407142616.7961-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.61 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, peter.maydell@linaro.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Stefan Reiter All code-paths leading to backup_clean (via job_clean) have the job's context already acquired. The job's context is guaranteed to be the same as the one used by backup_top via backup_job_create. Since the previous logic effectively acquired the lock twice, this broke cleanup of backups for disks using IO threads, since the BDRV_POLL_WHILE in bdrv_backup_top_drop -> bdrv_do_drained_begin would only release the lock once, thus deadlocking with the IO thread. This is a partial revert of 0abf2581717a19. Signed-off-by: Stefan Reiter Reviewed-by: Max Reitz Message-Id: <20200407115651.69472-4-s.reiter@proxmox.com> Signed-off-by: Kevin Wolf --- block/backup.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/block/backup.c b/block/backup.c index 7430ca5883..a7a7dcaf4c 100644 --- a/block/backup.c +++ b/block/backup.c @@ -126,11 +126,7 @@ static void backup_abort(Job *job) static void backup_clean(Job *job) { BackupBlockJob *s = container_of(job, BackupBlockJob, common.job); - AioContext *aio_context = bdrv_get_aio_context(s->backup_top); - - aio_context_acquire(aio_context); bdrv_backup_top_drop(s->backup_top); - aio_context_release(aio_context); } void backup_do_checkpoint(BlockJob *job, Error **errp)