From patchwork Thu Feb 12 03:07:15 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wen Congyang X-Patchwork-Id: 439016 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 1A92D14017A for ; Thu, 12 Feb 2015 14:13:04 +1100 (AEDT) Received: from localhost ([::1]:48034 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YLkD8-0006Fj-5F for incoming@patchwork.ozlabs.org; Wed, 11 Feb 2015 22:13:02 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:32784) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YLk5r-0002Au-0r for qemu-devel@nongnu.org; Wed, 11 Feb 2015 22:05:35 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YLk5l-00018m-1n for qemu-devel@nongnu.org; Wed, 11 Feb 2015 22:05:30 -0500 Received: from [59.151.112.132] (port=8994 helo=heian.cn.fujitsu.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YLk5j-00016B-UH for qemu-devel@nongnu.org; Wed, 11 Feb 2015 22:05:25 -0500 X-IronPort-AV: E=Sophos;i="5.04,848,1406563200"; d="scan'208";a="57476539" Received: from unknown (HELO edo.cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 12 Feb 2015 11:01:44 +0800 Received: from G08CNEXCHPEKD02.g08.fujitsu.local (localhost.localdomain [127.0.0.1]) by edo.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id t1C34Win030078; Thu, 12 Feb 2015 11:04:32 +0800 Received: from G08FNSTD140052.g08.fujitsu.local (10.167.226.52) by G08CNEXCHPEKD02.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.181.6; Thu, 12 Feb 2015 11:05:17 +0800 From: Wen Congyang To: qemu devel , Kevin Wolf , Stefan Hajnoczi , Paolo Bonzini Date: Thu, 12 Feb 2015 11:07:15 +0800 Message-ID: <1423710438-14377-12-git-send-email-wency@cn.fujitsu.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1423710438-14377-1-git-send-email-wency@cn.fujitsu.com> References: <1423710438-14377-1-git-send-email-wency@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.52] X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 59.151.112.132 Cc: Lai Jiangshan , Jiang Yunhong , Dong Eddie , "Dr. David Alan Gilbert" , Gonglei , Yang Hongyang , zhanghailiang Subject: [Qemu-devel] [RFC PATCH 11/14] allow writing to the backing file X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 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-bounces+incoming=patchwork.ozlabs.org@nongnu.org Signed-off-by: Wen Congyang Signed-off-by: zhanghailiang Signed-off-by: Gonglei --- block.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/block.c b/block.c index 067c44b..96cf973 100644 --- a/block.c +++ b/block.c @@ -856,8 +856,8 @@ static int bdrv_inherited_flags(int flags) */ static int bdrv_backing_flags(int flags) { - /* backing files always opened read-only */ - flags &= ~(BDRV_O_RDWR | BDRV_O_COPY_ON_READ); + /* backing files are opened read-write for block replication */ + flags &= ~BDRV_O_COPY_ON_READ; /* snapshot=on is handled on the top layer */ flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_TEMPORARY);