qemuBlockStorageSourceNeedsStorageSliceLayer: Deal with 'luks' files

The 'luks' driver in qemu is as any other non-raw format driver and thus
doesn't support the properties for 'slice'. Since libvirt considers
luks files to be raw+encryption we need to special case them when
dealing with the slice.

https://bugzilla.redhat.com/show_bug.cgi?id=1814975

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

src/qemu/qemu_block.c

@@ -3324,5 +3324,9 @@ qemuBlockStorageSourceNeedsStorageSliceLayer(const virStorageSource *src)
     if (src->format != VIR_STORAGE_FILE_RAW)
         return true;
 
+    if (src->encryption &&
+        src->encryption->format == VIR_STORAGE_ENCRYPTION_FORMAT_LUKS)
+        return true;
+
     return false;
 }