class FDB::DirectoryLayer

def exists?(db_or_tr, path=[])
  db_or_tr.transact do |tr|
    check_version(tr, false)
    path = to_unicode_path(path)
    node = find(tr, path).prefetch_metadata(tr)
    next false if !node.exists?
    if node.is_in_partition?
      next node.get_contents(self).exists?(tr, node.get_partition_subpath)
    end
    true
  end
end