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>
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;