Add an exception for image formats not supporting backing images so that
they can be reopened RW/RO without the need for adding a terminating
virStorageSource as they simply can't have a backing image.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
---
 src/qemu/qemu_block.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/qemu/qemu_block.c b/src/qemu/qemu_block.c
index a7c8be8d8b..af317a1f1f 100644
--- a/src/qemu/qemu_block.c
+++ b/src/qemu/qemu_block.c
@@ -3182,7 +3182,7 @@ qemuBlockReopenAccess(virDomainObj *vm,

     /* If we are lacking the object here, qemu might have opened an image with
      * a node name unknown to us */
-    if (!src->backingStore) {
+    if (src->format >= VIR_STORAGE_FILE_BACKING && !src->backingStore) {
         virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
                        _("can't reopen image with unknown presence of backing store"));
         return -1;
-- 
2.47.0