NDNFS: an NDN-friendly file system¶

NDNFS Metadata format¶

NDNFS uses metadata to facilitate the discovery of directory contents, file versions and segments.
The format of metadata is specified using "Google Protobuf":https://github.com/google/protobuf/.
Currently two types of metadata are defined: directory metadata and file metadata.

Directory metadata¶

The directory metadata helps the client navigate through the NDNFS hierarchy.
The metadata packet contains a list of metadata entries.
Each entry specifies the path of the entry and its entry type (file, directory, symlink, etc.).

message DirInfo
{
  required string path = 1;
  required int32 type = 2;
}

message DirInfoArray
{
  repeated DirInfo di = 1;
}

File metadata¶

The file metadata contains at least three attributes: size, total number of segments and current version number.
More attributes can be added in the future.

message FileInfo
{
  required int32 size = 1;
  required int32 totalseg = 2;
  required int32 version = 3;
}

NDNFS Metadata Protocol¶

TBD.

For more information, please refer to http://named-data.net/wp-content/uploads/2014/10/ndn-tr-27-ndnfs.pdf