synchronized(gdesc) { gdesc.setUsedDirsCount( gdesc.getUsedDirsCount()+diff ); }
gdesc.setUsedDirsCount( gdesc.getUsedDirsCount()+diff );
	protected void modifyUsedDirsCount(int group, int diff) {		GroupDescriptor gdesc = groupDescriptors[group];		synchronized(gdesc) {			gdesc.setUsedDirsCount( gdesc.getUsedDirsCount()+diff );		}	}