'Get volume status.
If \'refresh\' is True, run update the stats first.'

def get_volume_stats(self, refresh=False):

    try:
        if (refresh or (not self.stats)):
            self.stats = self.common.update_volume_stats()
            self.stats['driver_version'] = self.VERSION
    except Exception:
        with excutils.save_and_reraise_exception():
            LOG.exception('Failed    to    get_volume_stats.')
    return self.stats
