// Makes a directory called req.Name in dir
func (dir *Directory) Mkdir(req *fuse.MkdirRequest, intr fs.Intr) (fs.Node, fuse.Error) {
	filesystem.Lock(dir)
	defer filesystem.Unlock(dir)
	util.P_out(req.String())
	if strings.Contains(req.Name, "@") {
		return dir.mkArchive(req.Name)
	}
	subdir := new(Directory)
	subdir.InitDirectory(req.Name, os.ModeDir|req.Mode, dir)
	dir.setChild(subdir)
	subdir.dirty = true
	dir.dirty = true
	return subdir, nil
}