From patchwork Fri Jul 22 10:15:58 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wang WeiWei X-Patchwork-Id: 9243353 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 3975660757 for ; Fri, 22 Jul 2016 10:17:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2865023B3D for ; Fri, 22 Jul 2016 10:17:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1C47C27F9A; Fri, 22 Jul 2016 10:17:57 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 6DFDC23B3D for ; Fri, 22 Jul 2016 10:17:55 +0000 (UTC) Received: from localhost ([::1]:46251 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bQXWk-0005os-Ah for patchwork-qemu-devel@patchwork.kernel.org; Fri, 22 Jul 2016 06:17:54 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50004) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bQXW9-0005lu-Bh for qemu-devel@nongnu.org; Fri, 22 Jul 2016 06:17:18 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bQXW7-0001BO-2Y for qemu-devel@nongnu.org; Fri, 22 Jul 2016 06:17:16 -0400 Received: from [59.151.112.132] (port=37001 helo=heian.cn.fujitsu.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bQXVz-00017t-Ch; Fri, 22 Jul 2016 06:17:07 -0400 X-IronPort-AV: E=Sophos;i="5.22,518,1449504000"; d="scan'208";a="8983542" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 22 Jul 2016 18:16:50 +0800 Received: from G08CNEXCHPEKD03.g08.fujitsu.local (unknown [10.167.33.85]) by cn.fujitsu.com (Postfix) with ESMTP id EE6514290FE5; Fri, 22 Jul 2016 18:16:48 +0800 (CST) Received: from localhost.localdomain (10.167.226.96) by G08CNEXCHPEKD03.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.279.2; Fri, 22 Jul 2016 18:16:48 +0800 From: Wang WeiWei To: qemu devel , qemu block , Stefan Hajnoczi , Fam Zheng , Max Reitz , Kevin Wolf , Jeff Cody Date: Fri, 22 Jul 2016 18:15:58 +0800 Message-ID: <1469182567-3114-2-git-send-email-wangww.fnst@cn.fujitsu.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1469182567-3114-1-git-send-email-wangww.fnst@cn.fujitsu.com> References: <1469182567-3114-1-git-send-email-wangww.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.96] X-yoursite-MailScanner-ID: EE6514290FE5.A7C35 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: wangww.fnst@cn.fujitsu.com X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 59.151.112.132 Subject: [Qemu-devel] [PATCH v22 01/10] unblock backup operations in backing file 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: Changlong Xie , Wang Weiwei , zhanghailiang , Jiang Yunhong , Dong Eddie , Markus Armbruster , "Dr. David Alan Gilbert" , Gonglei , Paolo Bonzini , John Snow Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Wen Congyang Signed-off-by: Wen Congyang Signed-off-by: Changlong Xie Signed-off-by: Wang WeiWei --- block.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/block.c b/block.c index 30d64e6..194a060 100644 --- a/block.c +++ b/block.c @@ -1311,6 +1311,23 @@ void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd) /* Otherwise we won't be able to commit due to check in bdrv_commit */ bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET, bs->backing_blocker); + /* + * We do backup in 3 ways: + * 1. drive backup + * The target bs is new opened, and the source is top BDS + * 2. blockdev backup + * Both the source and the target are top BDSes. + * 3. internal backup(used for block replication) + * Both the source and the target are backing file + * + * In case 1 and 2, neither the source nor the target is the backing file. + * In case 3, we will block the top BDS, so there is only one block job + * for the top BDS and its backing chain. + */ + bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_BACKUP_SOURCE, + bs->backing_blocker); + bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_BACKUP_TARGET, + bs->backing_blocker); out: bdrv_refresh_limits(bs, NULL); }