From nobody Sun Nov 9 17:55:50 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1551289319783165.2018858672585; Wed, 27 Feb 2019 09:41:59 -0800 (PST) Received: from localhost ([127.0.0.1]:48186 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gz3DI-000865-Un for importer@patchew.org; Wed, 27 Feb 2019 12:41:48 -0500 Received: from eggs.gnu.org ([209.51.188.92]:51780) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gz2wf-0003s3-Ak for qemu-devel@nongnu.org; Wed, 27 Feb 2019 12:24:38 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gz2wc-0003wS-V2 for qemu-devel@nongnu.org; Wed, 27 Feb 2019 12:24:36 -0500 Received: from mx1.redhat.com ([209.132.183.28]:42302) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gz2wY-0003Gb-M8; Wed, 27 Feb 2019 12:24:30 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 3DC8D30C23DE; Wed, 27 Feb 2019 17:23:41 +0000 (UTC) Received: from linux.fritz.box.com (ovpn-117-19.ams2.redhat.com [10.36.117.19]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0EFD417153; Wed, 27 Feb 2019 17:23:37 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Date: Wed, 27 Feb 2019 18:22:48 +0100 Message-Id: <20190227172256.30368-13-kwolf@redhat.com> In-Reply-To: <20190227172256.30368-1-kwolf@redhat.com> References: <20190227172256.30368-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.44]); Wed, 27 Feb 2019 17:23:41 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH 12/20] qcow2: Return error for snapshot operation with data 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: kwolf@redhat.com, qemu-devel@nongnu.org, mreitz@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" Internal snapshots and an external data file are incompatible because snapshots require refcounting and non-linear mapping. Return an error for all of the snapshot operations if an external data file is in use. Signed-off-by: Kevin Wolf --- block/qcow2-snapshot.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c index 5ae3407f68..a6ffae89a6 100644 --- a/block/qcow2-snapshot.c +++ b/block/qcow2-snapshot.c @@ -353,6 +353,10 @@ int qcow2_snapshot_create(BlockDriverState *bs, QEMUSn= apshotInfo *sn_info) return -EFBIG; } =20 + if (has_data_file(bs)) { + return -ENOTSUP; + } + memset(sn, 0, sizeof(*sn)); =20 /* Generate an ID */ @@ -466,6 +470,10 @@ int qcow2_snapshot_goto(BlockDriverState *bs, const ch= ar *snapshot_id) int ret; uint64_t *sn_l1_table =3D NULL; =20 + if (has_data_file(bs)) { + return -ENOTSUP; + } + /* Search the snapshot */ snapshot_index =3D find_snapshot_by_id_or_name(bs, snapshot_id); if (snapshot_index < 0) { @@ -599,6 +607,10 @@ int qcow2_snapshot_delete(BlockDriverState *bs, QCowSnapshot sn; int snapshot_index, ret; =20 + if (has_data_file(bs)) { + return -ENOTSUP; + } + /* Search the snapshot */ snapshot_index =3D find_snapshot_by_id_and_name(bs, snapshot_id, name); if (snapshot_index < 0) { @@ -670,6 +682,9 @@ int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnaps= hotInfo **psn_tab) QCowSnapshot *sn; int i; =20 + if (has_data_file(bs)) { + return -ENOTSUP; + } if (!s->nb_snapshots) { *psn_tab =3D NULL; return s->nb_snapshots; --=20 2.20.1