question: private void prepareVolumes ( StorageSystem storage , Map < String , String > volumeUriToHluMap , List < StorageVolume > driverVolumes , Map < String , String > driverVolumeToHLUMap , Map < String , String > volumeNativeIdToUriMap ) { for ( Map . Entry < String , String > volumeUriToHlu : volumeUriToHluMap . entrySet ( ) ) { String volumeURI = volumeUriToHlu . getKey ( ) ; BlockObject volume = ( BlockObject ) dbClient . queryObject ( URIUtil . uri ( volumeURI ) ) ; StorageVolume driverVolume = createDriverVolume ( storage , volume ) ; driverVolumes . add ( driverVolume ) ; driverVolumeToHLUMap . put ( driverVolume . getNativeId ( ) , volumeUriToHlu . getValue ( ) ) ; volumeNativeIdToUriMap . put ( driverVolume . getNativeId ( ) , volumeURI ) ; } log . info ( "prepareVolumes: volume-HLU pairs for driver: {}" , driverVolumeToHLUMap ) ; }
target:  Prepare existing export mask volumes to driver export request (Ex. in context of add/remove initiators for export masks.)