From nobody Tue Feb 10 01:35:39 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1492675419911586.7663118068126; Thu, 20 Apr 2017 01:03:39 -0700 (PDT) Received: from localhost ([::1]:52163 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d173u-0007S4-El for importer@patchew.org; Thu, 20 Apr 2017 04:03:34 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55699) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d16uR-0007j4-SA for qemu-devel@nongnu.org; Thu, 20 Apr 2017 03:53:48 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1d16uR-0003gP-5h for qemu-devel@nongnu.org; Thu, 20 Apr 2017 03:53:47 -0400 Received: from mx1.redhat.com ([209.132.183.28]:60960) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1d16uM-0003eE-OC; Thu, 20 Apr 2017 03:53:42 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 97DE964DA1; Thu, 20 Apr 2017 07:53:41 +0000 (UTC) Received: from lemon.redhat.com (ovpn-8-22.pek2.redhat.com [10.72.8.22]) by smtp.corp.redhat.com (Postfix) with ESMTP id 274F618B36; Thu, 20 Apr 2017 07:53:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 97DE964DA1 Authentication-Results: ext-mx09.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx09.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=famz@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 97DE964DA1 From: Fam Zheng To: qemu-devel@nongnu.org Date: Thu, 20 Apr 2017 15:52:34 +0800 Message-Id: <20170420075237.18219-18-famz@redhat.com> In-Reply-To: <20170420075237.18219-1-famz@redhat.com> References: <20170420075237.18219-1-famz@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Thu, 20 Apr 2017 07:53:41 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v13 17/20] block: Workaround drive-backup sync=none for image locking X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , qemu-block@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Signed-off-by: Fam Zheng --- blockdev.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/blockdev.c b/blockdev.c index 4927914..5831b95 100644 --- a/blockdev.c +++ b/blockdev.c @@ -3223,6 +3223,9 @@ static BlockJob *do_drive_backup(DriveBackup *backup,= BlockJobTxn *txn, } } if (backup->sync =3D=3D MIRROR_SYNC_MODE_NONE) { + /* FIXME: block layer should really open target with BDRV_O_NO_BAC= KING + * and reuse source's backing chain, if they share one. */ + flags |=3D BDRV_O_UNSAFE_READ; source =3D bs; } =20 --=20 2.9.3