'limit' = Maximum quota allowed 'usage' = Currently used portion of quota (in bytes)
public function getQuota() { if ($this->_params['vfs_quotalimit'] == -1) { throw new Horde_Vfs_Exception('No quota set.'); } return array('limit' => $this->_params['vfs_quotalimit'], 'usage' => $this->getVFSSize()); }