From patchwork Mon Feb 22 09:50:37 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Changlong Xie X-Patchwork-Id: 8374361 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 9502D9F314 for ; Mon, 22 Feb 2016 09:49:41 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id EF87E2034B for ; Mon, 22 Feb 2016 09:49:40 +0000 (UTC) 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.kernel.org (Postfix) with ESMTPS id 4906220328 for ; Mon, 22 Feb 2016 09:49:40 +0000 (UTC) Received: from localhost ([::1]:48090 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aXn7b-00081L-Oz for patchwork-qemu-devel@patchwork.kernel.org; Mon, 22 Feb 2016 04:49:39 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:57724) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aXn7N-0007yT-I7 for qemu-devel@nongnu.org; Mon, 22 Feb 2016 04:49:26 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aXn7I-0005Wa-Mu for qemu-devel@nongnu.org; Mon, 22 Feb 2016 04:49:25 -0500 Received: from [59.151.112.132] (port=24276 helo=heian.cn.fujitsu.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aXn7I-0005Vy-7U for qemu-devel@nongnu.org; Mon, 22 Feb 2016 04:49:20 -0500 X-IronPort-AV: E=Sophos;i="5.20,346,1444665600"; d="scan'208";a="3782093" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 22 Feb 2016 17:49:11 +0800 Received: from G08CNEXCHPEKD01.g08.fujitsu.local (unknown [10.167.33.80]) by cn.fujitsu.com (Postfix) with ESMTP id D457E42AC843; Mon, 22 Feb 2016 17:47:13 +0800 (CST) Received: from changlox.g08.fujitsu.local (10.167.225.55) by G08CNEXCHPEKD01.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.181.6; Mon, 22 Feb 2016 17:49:05 +0800 From: Changlong Xie To: qemu devel , Alberto Garcia , Eric Blake , Kevin Wolf , Max Reitz Date: Mon, 22 Feb 2016 17:50:37 +0800 Message-ID: <1456134637-421-2-git-send-email-xiecl.fnst@cn.fujitsu.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1456134637-421-1-git-send-email-xiecl.fnst@cn.fujitsu.com> References: <1456134637-421-1-git-send-email-xiecl.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.225.55] X-yoursite-MailScanner-ID: D457E42AC843.A08A6 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: xiecl.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 Cc: "Dr. David Alan Gilbert" Subject: [Qemu-devel] [PATCH v3 1/1] quorum: modify vote rules for flush operation 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+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Keep flush interface the same logic as quorum read/write, Otherwise in following scenario, we'll encounter unexpected errors. Quorum has two children(A, B). A do flush sucessfully, but B flush failed. This cause the filesystem of guest become read-only with following errors: end_request: I/O error, dev vda, sector 11159960 Aborting journal on device vda3-8 EXT4-fs error (device vda3): ext4_journal_start_sb:327: Detected abort journal EXT4-fs (vda3): Remounting filesystem read-only Signed-off-by: Wen Congyang Signed-off-by: Changlong Xie --- block/quorum.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/block/quorum.c b/block/quorum.c index f78d4cb..62d3ccb 100644 --- a/block/quorum.c +++ b/block/quorum.c @@ -763,19 +763,26 @@ static coroutine_fn int quorum_co_flush(BlockDriverState *bs) QuorumVoteValue result_value; int i; int result = 0; + int success_count = 0; QLIST_INIT(&error_votes.vote_list); error_votes.compare = quorum_64bits_compare; for (i = 0; i < s->num_children; i++) { result = bdrv_co_flush(s->children[i]->bs); - result_value.l = result; - quorum_count_vote(&error_votes, &result_value, i); + if (result) { + result_value.l = result; + quorum_count_vote(&error_votes, &result_value, i); + } else + success_count++; } - winner = quorum_get_vote_winner(&error_votes); - result = winner->value.l; - + if (success_count >= s->threshold) + result = 0; + else { + winner = quorum_get_vote_winner(&error_votes); + result = winner->value.l; + } quorum_free_vote_list(&error_votes); return result;