'Extend volume to new size.'

def extend_volume(self, volume, new_size):

    LOG.debug('extend_volume    called')
    ret = self._modify_volume(volume, {'size': new_size})
    if (ret is True):
        LOG.info('volume    %(name)s    extended    to    %(size)d.', {'name': volume['name'], 'size': new_size})
    return
