qemuDomainGetMetadata: Add top-level flag validation

The implementation uses 'virDomainObjGetMetadata'
internally. To have a top level flag validation for the upcoming flag
introspection export the supported flags as a macro and add a
'virCheckFlags'.

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

src/conf/domain_conf.c

@@ -31557,8 +31557,7 @@ virDomainObjGetMetadata(virDomainObj *vm,
     virDomainDef *def;
     char *ret = NULL;
 
-    virCheckFlags(VIR_DOMAIN_AFFECT_LIVE |
-                  VIR_DOMAIN_AFFECT_CONFIG, NULL);
+    virCheckFlags(VIR_DOMAIN_OBJ_GET_METADATA_FLAGS, NULL);
 
     if (type >= VIR_DOMAIN_METADATA_LAST) {
         virReportError(VIR_ERR_INVALID_ARG,

src/conf/domain_conf.h

@@ -4543,6 +4543,10 @@ const char *virDomainChrSourceDefGetPath(virDomainChrSourceDef *chr);
 
 void virDomainChrSourceDefClear(virDomainChrSourceDef *def);
 
+#define VIR_DOMAIN_OBJ_GET_METADATA_FLAGS \
+    VIR_DOMAIN_AFFECT_LIVE | \
+    VIR_DOMAIN_AFFECT_CONFIG
+
 char *virDomainObjGetMetadata(virDomainObj *vm,
                               int type,
                               const char *uri,

src/qemu/qemu_driver.c

@@ -16004,6 +16004,8 @@ qemuDomainGetMetadata(virDomainPtr dom,
     virDomainObj *vm;
     char *ret = NULL;
 
+    virCheckFlags(VIR_DOMAIN_OBJ_GET_METADATA_FLAGS, NULL);
+
     if (!(vm = qemuDomainObjFromDomain(dom)))
         return NULL;