  /**
   * Determine whether we can use trash for the given blockFile. Trash
   * is disallowed if a 'previous' directory exists for the
   * storage directory containing the block.
   */
  /**
   * Determine whether we can use trash for the given blockFile. Trash
   * is disallowed if a 'previous' directory exists for the
   * storage directory containing the block.
   */ | BlockPoolSliceStorage.java