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

  required string filename = 2;
  required uint64 version = 3;
  required uint32 timestamp = 4;
  optional uint64 seg_num = 5;
  optional bytes  file_hash = 6;

  optional uint32 mtime = 7;
  optional uint32 mode  = 8;
  // optional uint32 atime = 9;
  // optional uint32 ctime = 10;

  optional bytes  parent_device_name = 11;
  optional uint64 parent_seq_no = 12;
}