[PULL,01/29] qcow2: Fix alloc_cluster_abort() for pre-existing clusters
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Message ID 20200306171458.1848-2-kwolf@redhat.com
State New
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Series
  • [PULL,01/29] qcow2: Fix alloc_cluster_abort() for pre-existing clusters
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Commit Message

Kevin Wolf March 6, 2020, 5:14 p.m. UTC
From: Max Reitz <mreitz@redhat.com>

handle_alloc() reuses preallocated zero clusters.  If anything goes
wrong during the data write, we do not change their L2 entry, so we
must not let qcow2_alloc_cluster_abort() free them.

Fixes: 8b24cd141549b5b264baeddd4e72902cfb5de23b
Cc: qemu-stable@nongnu.org
Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20200225143130.111267-2-mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/qcow2-cluster.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch
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diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 78c95dfa16..17f1363279 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -1026,7 +1026,7 @@  err:
 void qcow2_alloc_cluster_abort(BlockDriverState *bs, QCowL2Meta *m)
 {
     BDRVQcow2State *s = bs->opaque;
-    if (!has_data_file(bs)) {
+    if (!has_data_file(bs) && !m->keep_old_clusters) {
         qcow2_free_clusters(bs, m->alloc_offset,
                             m->nb_clusters << s->cluster_bits,
                             QCOW2_DISCARD_NEVER);