message FileItem
{
  enum FileType
  {
    LATEST = 0;
    OLDEST = 1;
  }
  required FileType type = 1;

  required string filename = 2;
  required bytes  device_name = 3;
  required uint64 seq_no = 4;

  required bytes  file_hash = 5;
  required uint32 mtime = 6;
  required uint32 mode  = 7;
  required uint64 seg_num = 8;
}