1 files changed, 16 insertions, 0 deletions
diff --git a/blockdev.c b/blockdev.c
index 218024497b..eb2517f1dd 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1497,6 +1497,22 @@ static void external_snapshot_action(TransactionAction *action,
         return;
     }
 
+    /*
+     * Older QEMU versions have allowed adding an active parent node to an
+     * inactive child node. This is unsafe in the general case, but there is an
+     * important use case, which is taking a VM snapshot with migration to file
+     * and then adding an external snapshot while the VM is still stopped and
+     * images are inactive. Requiring the user to explicitly create the overlay
+     * as inactive would break compatibility, so just do it automatically here
+     * to keep this working.
+     */
+    if (bdrv_is_inactive(state->old_bs) && !bdrv_is_inactive(state->new_bs)) {
+        ret = bdrv_inactivate(state->new_bs, errp);
+        if (ret < 0) {
+            return;
+        }
+    }
+
     ret = bdrv_append(state->new_bs, state->old_bs, errp);
     if (ret < 0) {
         return;