Prajwal's Custom Virtual File System (CVFS)

📌 Overview

Prajwal's Custom Virtual File System (CVFS) is a system-level project built from scratch using C and C++. It simulates the core internal architecture, memory management, and command-line interface of a Linux-based Operating System.

Instead of interacting with the physical hard drive, this project creates a virtual file system entirely within the system's Primary Memory (RAM). It manages virtual files using custom-built low-level data structures.

🚀 Core Features & Concepts

• Dynamic Memory Allocation: Handles memory efficiently to store files and data structures at runtime.
• Custom Data Structures: Extensive use of Singly and Doubly Linked Lists to manage the Inode Table, File Table, and User File Descriptor Table (UFDT).
• OS Fundamentals Implemented:
  • Super Block & Boot Block: Initializes and manages the total and free inodes.
  • Inodes (Index Nodes): Stores metadata for every created file (size, type, permissions, reference count).
  • File Descriptors: Maps user requests to the actual file in memory.
• Interactive Shell: A custom, infinite-listening command-line interface that executes standard Linux file-handling commands.

🛠️ Supported Commands

The CVFS interactive shell supports the following custom commands:

Command	Usage	Description
help	help	Displays the help manual for all commands.
man	man [command]	Displays the manual page for a specific command.
clear	clear	Clears the terminal screen.
ls	ls	Lists all created files and their current sizes.
creat	creat [filename] [permission]	Creates a new file. (Permissions: 1=Read, 2=Write, 3=Both)
write	write [fd]	Prompts to write string data into the specified file descriptor.
read	read [fd] [bytes]	Reads a specific number of bytes from a file.
stat	stat [filename]	Displays statistical information and metadata about a file.
unlink	unlink [filename]	Deletes a file and safely frees its allocated memory and inodes.
exit	exit	Safely deallocates all resources and terminates the file system.

💻 How to Compile and Run

Prerequisites

• A C/C++ compiler (like GCC or MinGW) installed on your system.

Steps to Execute

1. Clone this repository to your local machine:

   git clone [https://github.com/pansareprajwal/Custom-Virtual-File-System.git](https://github.com/pansareprajwal/Custom-Virtual-File-System.git)
   
   

👨‍💻 Author

Prajwal Sanjay Pansare

GitHub: @pansareprajwal

LinkedIn: Prajwal Pansare