code: def write_file_list_cache(opts, data, list_cache, w_lock):
      '''
      Checks the cache file to see if there is a new enough file list cache, and
      returns the match (if found, along with booleans used by the fileserver
      backend to determine if the cache needs to be refreshed/written).
      '''
      serial = salt.payload.Serial(opts)
      with salt.utils.files.fopen(list_cache, 'w+b') as fp_:
          fp_.write(serial.dumps(data))
          _unlock_cache(w_lock)
          log.trace('Lockfile %s removed', w_lockf write_file_list_cache(opts, data, list_cache, w_lock):
      '''
      Checks the cache file to see if there is a new enough file list cache, and
      returns the match (if found, along with booleans used by the fileserver
      backend to determine if the cache needs to be refreshed/written).
      '''
      serial = salt.payload.Serial(opts)
      with salt.utils.files.fopen(list_cache, 'w+b') as fp_:
          fp_.write(serial.dumps(data))
          _unlock_cache(w_lock)
          log.trace('Lockfile %s removed', w_lock)
docs: Checks the cache file to see if there is a new enough file list cache, and
      returns the match (if found, along with booleans used by the fileserver
      backend to determine if the cache needs to be refreshed/written).