GDP

syntax = "proto2";

package GDPfs;

enum FileType {

    UNKNOWN_TYPE = 0;

    FILE = 1;

    DIR = 2;

}

enum Operation {

    UNKNOWN_OP = 0;

    ADD = 1;

    DELETE = 2;

}

// The first record in a log indicates the type and other

// meta information about the file/directory.

message GDPfsMeta {

    // the *preferred* name for this file/directory. But

    // this is merely a suggestion.

    required FileType type = 1 [default = UNKNOWN_TYPE];

    optional string name = 2;

}

// For a directory, all records starting from the second

// record are of the following type:

message GDPfsDentry {

    // the operation

    required Operation op = 1;

    // the name of the entry. This is the name of the

    // file/directory without any slashes.

    required string name = 2;

    // the corresponding logname. This isn't required

    // for all operations. For example, delete does not

    // need the logname, only the name of the file/dir.

    // Note that this is the 32-byte internal name. 

    optional bytes logname = 3;

    // Type. Whether it is a directory or file.

    optional FileType type = 4;

}

// For a file, all records starting from the second

// record are of the following type:

message GDPfsFchunk {

    // offset of this file chunk in the file.

    required uint64 offset = 1;

    // ideally, this should be 16 bits. But we do not

    // have a pre-defined protobuf scalar for 16-bit.

    required uint32 length = 2;

    // actual data.

    required bytes data = 3;

}

message GDPfsMsg {

    oneof msg_oneof {

        GDPfsMeta meta = 1;

        GDPfsDentry dentry = 2;

        GDPfsFchunk fchunk = 3;

    }

    // time represented in nanoseconds since epoch.

    optional uint64 time_ns = 8;

}