File-System Project

Overview

This project is a basic file system with disk storage and multi-user support implemented in C. It was developed as part of the CS2303: Project Workshop of Operating Systems course at Shanghai Jiao Tong University. The system includes a server-side disk management module and a client-side interface, enabling users to perform common file operations over a network using socket communication.

Features

• Disk Storage System: Supports disk initialization, reading, and writing using sector-based access.
• File System: Basic file operations including file creation, deletion, reading, and writing.
• Multi-user Support: Allows multiple users with individual home directories and file permissions.
• Socket Communication: Communication between the client and server is handled via TCP sockets.
• Directory Management: Provides functions for managing directories, including creation, listing, and deletion.

Project Structure

Disk Storage System

• BDS.c: The server that handles disk operations such as reading and writing data to disk blocks.
• BDC.c: The client that interacts with the disk server and sends commands for disk I/O operations.

File System

• File System Server: Manages the file system, including the root directory, INode structure, and file data storage.
• File System Client: Allows users to interact with the file system, perform operations, and communicate with the server.

Multi-user Support

• Supports user creation, deletion, and login.
• Users have their own file permissions and home directories.
• Each file is associated with an owner and permission settings (read-only or writable).

File Operations

The following commands are implemented in the file system:

• Initialize: Prepares the disk and root directory for file operations.
• Create: Creates a file or directory.
• Read: Reads the content of a file.
• Write: Writes data to a file.
• Delete: Deletes a file or directory.
• List: Lists all files in the current directory.
• Change Directory: Navigates between directories.

Multi-User Functionality

• Login: Users can log in and access their own files and directories.
• Permissions: Each file has specific read/write permissions associated with its owner.
• File Ownership: Files created by users are tagged with the user as the owner, and permissions control who can modify the file.

How to Run

1. Compile the code:

gcc -o server BDS.c
gcc -o client BDC.c
gcc -o file_system_server FileSystemServer.c
gcc -o file_system_client FileSystemClient.c

3. Start the disk server:

./server disk_file cylinders sectors_per_cylinder track_to_track_delay port_number

3. Start the file system server:

./file_system_server port_number

4. Run the client:

./client port_number