question: private String findVfilerName ( FileShare fs ) { String portGroup = null ; URI port = fs . getStoragePort ( ) ; if ( port == null ) { _log . info ( "No storage port URI to retrieve vFiler name" ) ; } else { StoragePort stPort = _dbClient . queryObject ( StoragePort . class , port ) ; if ( stPort != null ) { URI haDomainUri = stPort . getStorageHADomain ( ) ; if ( haDomainUri == null ) { _log . info ( "No Port Group URI for port {}" , port ) ; } else { StorageHADomain haDomain = _dbClient . queryObject ( StorageHADomain . class , haDomainUri ) ; if ( haDomain != null && haDomain . getVirtual ( ) == true ) { portGroup = stPort . getPortGroup ( ) ; _log . debug ( "using port {} and vFiler {}" , stPort . getPortNetworkId ( ) , portGroup ) ; } } } } return portGroup ; }
target:  Return the vFiler name associated with the file system. If a vFiler is not associated with this file system, then it will return null.