+ if (may_exist) {
+ struct vsctl_bridge *br;
+
+ br = find_bridge(&info, br_name, false);
+ if (br) {
+ if (!parent_name) {
+ if (br->parent) {
+ vsctl_fatal("\"--may-exist add-br %s\" but %s is "
+ "a VLAN bridge for VLAN %d",
+ br_name, br_name, br->vlan);
+ }
+ } else {
+ if (!br->parent) {
+ vsctl_fatal("\"--may-exist add-br %s %s %d\" but %s "
+ "is not a VLAN bridge",
+ br_name, parent_name, vlan, br_name);
+ } else if (strcmp(br->parent->name, parent_name)) {
+ vsctl_fatal("\"--may-exist add-br %s %s %d\" but %s "
+ "has the wrong parent %s",
+ br_name, parent_name, vlan,
+ br_name, br->parent->name);
+ } else if (br->vlan != vlan) {
+ vsctl_fatal("\"--may-exist add-br %s %s %d\" but %s "
+ "is a VLAN bridge for the wrong VLAN %d",
+ br_name, parent_name, vlan, br_name, br->vlan);
+ }
+ }
+ return;
+ }
+ }