spec *volume.Spec,
	newSize resource.Quantity,
	oldSize resource.Quantity) (resource.Quantity, error) {
	klog.V(4).Infof("Expanding: %s from %v to %v", spec.Name(), oldSize, newSize)
	err := plugin.util.ResizeVolume(spec, newSize, plugin.host)
	if err != nil {
		return oldSize, err
	}

	klog.V(4).Infof("Successfully resized %s to %v", spec.Name(), newSize)
	return newSize, nil
}

	if err != nil {
		klog.Errorf("Error unmounting Portworx Volume (%v) on Path (%v): %v", u.volName, mountPath, err)
		return err
	}
	return nil
}

func (util *portworxVolumeUtil) ResizeVolume(spec *volume.Spec, newSize resource.Quantity, volumeHost volume.VolumeHost) error {
	driver, err := util.getPortworxDriver(volumeHost)
	if err != nil || driver == nil {