cleanup

# File activesupport/lib/active_support/cache/file_store.rb, line 30
      def cleanup(options = nil)
        options = merged_options(options)
        search_dir(cache_path) do |fname|
          key = file_path_key(fname)
          entry = read_entry(key, options)
          delete_entry(key, options) if entry && entry.expired?
        end
      end