message ActionItem
{
  enum ActionType
  {
    UPDATE = 0;
    DELETE = 1;
  }
  required ActionType action = 0;

  required string filename = 1;
  required uint64 version = 2;
  required uint32 timestamp = 3;
  optional uint64 seg_num = 4;
  optional bytes  file_hash = 5;

  optional uint32 mtime = 6;
  optional uint32 mode  = 7;
  optional uint32 atime = 8;
  optional uint32 ctime = 9;

  // optional bytes  parent_device_name = 12;
  // optional uint64 parent_seq_no = 13;
}