From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 45AF3C10DCE for ; Fri, 6 Mar 2020 22:53:28 +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 0E331206CC for ; Fri, 6 Mar 2020 22:53:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Kk2t6php" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0E331206CC 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+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:43270 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jALqR-0006FC-3K for qemu-devel@archiver.kernel.org; Fri, 06 Mar 2020 17:53:27 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:33579) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jALow-0004SU-1R for qemu-devel@nongnu.org; Fri, 06 Mar 2020 17:51:55 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jALou-0004co-J6 for qemu-devel@nongnu.org; Fri, 06 Mar 2020 17:51:53 -0500 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:57039 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jALou-0004cD-ER for qemu-devel@nongnu.org; Fri, 06 Mar 2020 17:51:52 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1583535112; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=dlQgTlA/34BKdSZZY8liAKhxAkDagmZD6fnwRPx7ruY=; b=Kk2t6phpk/yP3ukuKSYYl3iYY6o0MDFc3EtfT52z4s8Ln/1chx/A1eF+zkqWwOLz9ZQCJY kMBn2TePEIZFbC0m554DxhGPseLR3egQNQP6c+tjzJZMkEa/TSwbn2igxhs6BudApODU86 2CKEg/sKwLJKk+By8UAHpJje/3XrHE4= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-185-GDJHifM5MDiRWutypqahdw-1; Fri, 06 Mar 2020 17:51:50 -0500 X-MC-Unique: GDJHifM5MDiRWutypqahdw-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 7BE7F189F765; Fri, 6 Mar 2020 22:51:44 +0000 (UTC) Received: from blue.redhat.com (ovpn-117-177.phx2.redhat.com [10.3.117.177]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1947960BE0; Fri, 6 Mar 2020 22:51:41 +0000 (UTC) From: Eric Blake To: qemu-devel@nongnu.org Subject: [PATCH v3 3/4] block: Add support to warn on backing file change without format Date: Fri, 6 Mar 2020 16:51:20 -0600 Message-Id: <20200306225121.3199279-4-eblake@redhat.com> In-Reply-To: <20200306225121.3199279-1-eblake@redhat.com> References: <20200306225121.3199279-1-eblake@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.120 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 , pkrempa@redhat.com, =?UTF-8?q?J=C3=A1n=20Tomko?= , qemu-block@nongnu.org, libvir-list@redhat.com, Markus Armbruster , mreitz@redhat.com, John Snow Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" For now, this is a mechanical addition; all callers pass false. But the next patch will use it to improve 'qemu-img rebase -u' when selecting a backing file with no format. Signed-off-by: Eric Blake Reviewed-by: Peter Krempa Reviewed-by: J=C3=A1n Tomko --- include/block/block.h | 4 ++-- block.c | 13 ++++++++++--- block/qcow2.c | 2 +- block/stream.c | 2 +- blockdev.c | 3 ++- qemu-img.c | 4 ++-- 6 files changed, 18 insertions(+), 10 deletions(-) diff --git a/include/block/block.h b/include/block/block.h index cd6b5b95aad2..8b1dd94f7629 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -350,8 +350,8 @@ BlockMeasureInfo *bdrv_measure(BlockDriver *drv, QemuOp= ts *opts, void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr); void bdrv_refresh_limits(BlockDriverState *bs, Error **errp); int bdrv_commit(BlockDriverState *bs); -int bdrv_change_backing_file(BlockDriverState *bs, - const char *backing_file, const char *backing_fmt); +int bdrv_change_backing_file(BlockDriverState *bs, const char *backing_fil= e, + const char *backing_fmt, bool warn); void bdrv_register(BlockDriver *bdrv); int bdrv_drop_intermediate(BlockDriverState *top, BlockDriverState *base, const char *backing_file_str); diff --git a/block.c b/block.c index 957630b1c5d5..43452976acdc 100644 --- a/block.c +++ b/block.c @@ -1291,7 +1291,8 @@ static int bdrv_backing_update_filename(BdrvChild *c,= BlockDriverState *base, } ret =3D bdrv_change_backing_file(parent, filename, - base->drv ? base->drv->format_name : ""= ); + base->drv ? base->drv->format_name : ""= , + false); if (ret < 0) { error_setg_errno(errp, -ret, "Could not update backing file link")= ; } @@ -4535,8 +4536,8 @@ int bdrv_check(BlockDriverState *bs, * image file header * -ENOTSUP - format driver doesn't support changing the backing file */ -int bdrv_change_backing_file(BlockDriverState *bs, - const char *backing_file, const char *backing_fmt) +int bdrv_change_backing_file(BlockDriverState *bs, const char *backing_fil= e, + const char *backing_fmt, bool warn) { BlockDriver *drv =3D bs->drv; int ret; @@ -4550,6 +4551,12 @@ int bdrv_change_backing_file(BlockDriverState *bs, return -EINVAL; } + if (warn && backing_file && !backing_fmt) { + warn_report("Deprecated use of backing file without explicit " + "backing format, use of this image requires " + "potentially unsafe format probing"); + } + if (drv->bdrv_change_backing_file !=3D NULL) { ret =3D drv->bdrv_change_backing_file(bs, backing_file, backing_fm= t); } else { diff --git a/block/qcow2.c b/block/qcow2.c index 3640e8c07d0a..0abd6073fc34 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -3506,7 +3506,7 @@ qcow2_co_create(BlockdevCreateOptions *create_options= , Error **errp) } ret =3D bdrv_change_backing_file(blk_bs(blk), qcow2_opts->backing_= file, - backing_format); + backing_format, false); if (ret < 0) { error_setg_errno(errp, -ret, "Could not assign backing file '%= s' " "with format '%s'", qcow2_opts->backing_file, diff --git a/block/stream.c b/block/stream.c index 5562ccbf577a..7c4d8ee0bcf1 100644 --- a/block/stream.c +++ b/block/stream.c @@ -78,7 +78,7 @@ static int stream_prepare(Job *job) } } bdrv_set_backing_hd(bs, base, &local_err); - ret =3D bdrv_change_backing_file(bs, base_id, base_fmt); + ret =3D bdrv_change_backing_file(bs, base_id, base_fmt, false); if (local_err) { error_report_err(local_err); return -EPERM; diff --git a/blockdev.c b/blockdev.c index 3e44fa766b8f..c961df4c76b9 100644 --- a/blockdev.c +++ b/blockdev.c @@ -3796,7 +3796,8 @@ void qmp_change_backing_file(const char *device, } ret =3D bdrv_change_backing_file(image_bs, backing_file, - image_bs->drv ? image_bs->drv->format_name = : ""); + image_bs->drv ? image_bs->drv->format_n= ame : "", + false); if (ret < 0) { error_setg_errno(errp, -ret, "Could not change backing file to '%s= '", diff --git a/qemu-img.c b/qemu-img.c index 804630a368d6..b9375427404d 100644 --- a/qemu-img.c +++ b/qemu-img.c @@ -3637,9 +3637,9 @@ static int img_rebase(int argc, char **argv) * doesn't change when we switch the backing file. */ if (out_baseimg && *out_baseimg) { - ret =3D bdrv_change_backing_file(bs, out_baseimg, out_basefmt); + ret =3D bdrv_change_backing_file(bs, out_baseimg, out_basefmt, fal= se); } else { - ret =3D bdrv_change_backing_file(bs, NULL, NULL); + ret =3D bdrv_change_backing_file(bs, NULL, NULL, false); } if (ret =3D=3D -ENOSPC) { --=20 2.25.1