Introduction

Transparent Remote File Operation project is a simple implementation of Remote Procedure Call (RPC) that supports a subset of operations in real world PRC framework. It supports: open, close, read, write, lseek, stat, unlink, getdirentries, getdirtree and freedirtree.

System structure diagram

Key features:

• Transparent:

  This project uses library interposition technique to replace Linux standard library. The replacements perform the same as their original functions, except that they are all executed on remote server.

• Error handling:

  This implementation can handle most of the comment errors that might happens on every day’s operation. Return values and error numbers are all properly handled.

• Customized Function:

  This library supports customized functions.

This document will illustrate some detailed design of this project.

Protocol Design

There are two major protocol design for this project: Operation Exchange Protocol and Dirtree Transmission Protocol.

Operation Exchange Protocol

Operation exchange protocol defined as below:

Major Fields

• (enum) op: operation type.
• (int) version: RPC protocol version.
• (int) flags: reserved.
• (void *) content: packed serialized parameters for function call.
• (int) content_bufsize: content buffer size.
• (int) content_len: actual content length.