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From 54f9157a918e1404f2f17ce89a9c8b9088c1bc06 Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Fri, 20 Aug 2021 18:25:12 +0200
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Subject: qcow2: Deprecation warning when opening v2 images rw
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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RH-MergeRequest: 37: qcow2: Deprecation warning when opening v2 images rw
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RH-Commit: [1/1] f450d0ae32d35063b28c72c4f2d2ebb9e6d8db3e (kmwolf/centos-qemu-kvm)
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RH-Bugzilla: 1951814
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Hanna Reitz <hreitz@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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qcow2 v3 has been around for a long time (since QEMU 1.1/RHEL 7), so
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there is no real reason any more to use it. People still using it might
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do so unintentionally. Warn about it and suggest upgrading during the
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RHEL 9 timeframe so that the code can possibly be disabled in RHEL 10.
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The warning is restricted to read-write mode and the system emulator.
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The primary motivation for not having it in qemu-img is that 'qemu-img
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amend' for upgrades would warn otherwise. It also avoids having to make
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too many changes to the test suite.
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bdrv_uses_whitelist() is used as a proxy for deciding whether we are
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running in a tool or the system emulator. This is not entirely clean,
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but it's what is available and the same function qcow2_do_open() already
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uses it this way for another warning.
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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patch_name: kvm-qcow2-Deprecation-warning-when-opening-v2-images-rw.patch
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present_in_specfile: true
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location_in_specfile: 116
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---
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Rebase notes (6.1.0):
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- Replace bs->read_only with bdrv_is_read_only
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---
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block/qcow2.c | 6 ++++++
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tests/qemu-iotests/common.filter | 1 +
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2 files changed, 7 insertions(+)
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diff --git a/block/qcow2.c b/block/qcow2.c
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index b5c47931ef..a795e457ac 100644
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--- a/block/qcow2.c
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+++ b/block/qcow2.c
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@@ -1337,6 +1337,12 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options,
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ret = -ENOTSUP;
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goto fail;
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}
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+ if (header.version < 3 && !bdrv_is_read_only(bs) && bdrv_uses_whitelist()) {
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+ warn_report_once("qcow2 v2 images are deprecated and may not be "
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+ "supported in future versions. Please consider "
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+ "upgrading the image with 'qemu-img amend "
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+ "-o compat=v3'.");
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+ }
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s->qcow_version = header.version;
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diff --git a/tests/qemu-iotests/common.filter b/tests/qemu-iotests/common.filter
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index cc9f1a5891..6a13757177 100644
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--- a/tests/qemu-iotests/common.filter
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+++ b/tests/qemu-iotests/common.filter
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@@ -83,6 +83,7 @@ _filter_qemu()
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{
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gsed -e "s#\\(^\\|(qemu) \\)$(basename $QEMU_PROG):#\1QEMU_PROG:#" \
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-e 's#^QEMU [0-9]\+\.[0-9]\+\.[0-9]\+ monitor#QEMU X.Y.Z monitor#' \
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+ -e "/qcow2 v2 images are deprecated/d" \
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-e $'s#\r##' # QEMU monitor uses \r\n line endings
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}
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--
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2.31.1
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