if !sys.Initialized() {
		err = errServerNotInitialized
		return updatedAt, addedOrRemoved, effectivePolicies, err
	}

	userOrGroup := r.User
	var isGroup bool
	if userOrGroup == "" {
		isGroup = true
		userOrGroup = r.Group
	}

	if isGroup {
		_, err = sys.GetGroupDescription(userOrGroup)
		if err != nil {
			return updatedAt, addedOrRemoved, effectivePolicies, err
		}
	} else {

		adminRouter.Methods(http.MethodPut).Path(adminVersion+"/set-user-or-group-policy").
			HandlerFunc(adminMiddleware(adminAPI.SetPolicyForUserOrGroup)).
			Queries("policyName", "{policyName:.*}", "userOrGroup", "{userOrGroup:.*}", "isGroup", "{isGroup:true|false}")

		// Attach/Detach policies to/from user or group

- Apply fsGroup policy for ReadWriteOncePod volumes. ([#128244](https://github.com/kubernetes/kubernetes/pull/128244), [@gnufied](https://github.com/gnufied)) [SIG Storage and Testing]

- Fixed a test failure in `TestSetVolumeOwnershipOwner` for `fsGroup=3000` and
  symlink cases in `volume_linux_test.go`. The tests were failing due to invalid
  ownership verification and the issue has been resolved by adjusting file