From patchwork Fri Oct 11 15:28:12 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Max Reitz X-Patchwork-Id: 11185759 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2A0A7112B for ; Fri, 11 Oct 2019 15:39:59 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 0A2B1206A1 for ; Fri, 11 Oct 2019 15:39:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0A2B1206A1 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:52328 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iIx1J-0006Pw-R0 for patchwork-qemu-devel@patchwork.kernel.org; Fri, 11 Oct 2019 11:39:57 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:57999) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iIwqi-000235-Vd for qemu-devel@nongnu.org; Fri, 11 Oct 2019 11:29:01 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iIwqh-0006jp-U5 for qemu-devel@nongnu.org; Fri, 11 Oct 2019 11:29:00 -0400 Received: from mx1.redhat.com ([209.132.183.28]:56634) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iIwqf-0006hI-KN; Fri, 11 Oct 2019 11:28:57 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D4CF3C059B80; Fri, 11 Oct 2019 15:28:56 +0000 (UTC) Received: from localhost (ovpn-116-40.ams2.redhat.com [10.36.116.40]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 5CFFC5D6C8; Fri, 11 Oct 2019 15:28:56 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Subject: [PATCH v3 14/16] qcow2: Fix v3 snapshot table entry compliancy Date: Fri, 11 Oct 2019 17:28:12 +0200 Message-Id: <20191011152814.14791-15-mreitz@redhat.com> In-Reply-To: <20191011152814.14791-1-mreitz@redhat.com> References: <20191011152814.14791-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Fri, 11 Oct 2019 15:28:56 +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 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: Kevin Wolf , qemu-devel@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" qcow2 v3 images require every snapshot table entry to have at least 16 bytes of extra data. If they do not, let qemu-img check -r all fix it. Signed-off-by: Max Reitz Reviewed-by: Eric Blake --- block/qcow2-snapshot.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c index dac8a778e4..5ab64da1ec 100644 --- a/block/qcow2-snapshot.c +++ b/block/qcow2-snapshot.c @@ -516,6 +516,24 @@ int coroutine_fn qcow2_check_read_snapshot_table(BlockDriverState *bs, result->corruptions -= nb_clusters_reduced; } + /* + * All of v3 images' snapshot table entries need to have at least + * 16 bytes of extra data. + */ + if (s->qcow_version >= 3) { + int i; + for (i = 0; i < s->nb_snapshots; i++) { + if (s->snapshots[i].extra_data_size < + sizeof_field(QCowSnapshotExtraData, vm_state_size_large) + + sizeof_field(QCowSnapshotExtraData, disk_size)) + { + result->corruptions++; + fprintf(stderr, "%s snapshot table entry %i is incomplete\n", + fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i); + } + } + } + return 0; }