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qcow2: Discard preallocated zero clusters

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In discard_single_l2(), we completely discard normal clusters instead of
simply turning them into preallocated zero clusters. That means we
should probably do the same with such preallocated zero clusters:
Discard them instead of keeping them allocated.

Reported-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2017-05-04 01:11:19 +02:00 committed by Kevin Wolf
parent 564a6b6938
commit 293073a56c
1 changed files with 2 additions and 1 deletions
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block/qcow2-cluster.c
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@ -1511,7 +1511,8 @@ static int discard_single_l2(BlockDriverState *bs, uint64_t offset,
break;
case QCOW2_CLUSTER_ZERO:
if (!full_discard) {
/* Preallocated zero clusters should be discarded in any case */
if (!full_discard && (old_l2_entry & L2E_OFFSET_MASK) == 0) {
continue;
}
break;