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From bd97bbbce54da301407d51cae35e09ba2a12b160 Mon Sep 17 00:00:00 2001
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From: Max Reitz <mreitz@redhat.com>
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Date: Mon, 13 Jul 2020 14:24:48 -0400
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Subject: [PATCH 1/4] qcow2: Fix alloc_cluster_abort() for pre-existing
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clusters
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RH-Author: Max Reitz <mreitz@redhat.com>
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Message-id: <20200713142451.289703-2-mreitz@redhat.com>
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Patchwork-id: 97954
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O-Subject: [RHEL-8.3.0 qemu-kvm PATCH 1/4] qcow2: Fix alloc_cluster_abort() for pre-existing clusters
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Bugzilla: 1807057
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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handle_alloc() reuses preallocated zero clusters. If anything goes
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wrong during the data write, we do not change their L2 entry, so we
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must not let qcow2_alloc_cluster_abort() free them.
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Fixes: 8b24cd141549b5b264baeddd4e72902cfb5de23b
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Cc: qemu-stable@nongnu.org
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Message-Id: <20200225143130.111267-2-mreitz@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 3ede935fdbbd5f7b24b4724bbfb8938acb5956d8)
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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block/qcow2-cluster.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
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index 9d04f8d77b..1970797ce5 100644
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--- a/block/qcow2-cluster.c
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+++ b/block/qcow2-cluster.c
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@@ -1015,7 +1015,7 @@ err:
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void qcow2_alloc_cluster_abort(BlockDriverState *bs, QCowL2Meta *m)
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{
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BDRVQcow2State *s = bs->opaque;
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- if (!has_data_file(bs)) {
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+ if (!has_data_file(bs) && !m->keep_old_clusters) {
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qcow2_free_clusters(bs, m->alloc_offset,
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m->nb_clusters << s->cluster_bits,
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QCOW2_DISCARD_NEVER);
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--
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2.27.0
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