Simple FUSE File System (C)

🚀 Overview

This project demonstrates a basic user-space filesystem using FUSE (Filesystem in Userspace). It mounts a virtual filesystem with one file, hello.txt, and supports simple read operations.

📁 Project Structure

./
├── disk.c
├── fs.h
├── fusefs
├── main.c
├── Makefile
├── README.md
└── mountdir/       # mount point directory for testing

🧱 Prerequisites (Ubuntu)

Install the required packages before building and running the project:

sudo apt update
sudo apt install -y libfuse-dev fuse pkg-config build-essential

On Ubuntu, build-essential provides gcc, make, and other common build tools.

⚙️ Build and Run

1. Build the filesystem binary:

make

2. Create the mount point directory if it does not exist:

mkdir -p mountdir

3. Run the FUSE filesystem:

./fusefs mountdir

4. Open a new terminal or background the process, then access the mounted filesystem:

cd mountdir
ls
cat hello.txt

🧹 Unmount

When you are done, unmount the filesystem:

fusermount -u mountdir

📌 Expected Output

hello.txt
Hello from FUSE filesystem!

💡 Notes

• fusefs must run with FUSE available on the system.
• If ./fusefs mountdir does not return, it is running in foreground and keeping the filesystem mounted.
• Use fusermount -u mountdir to cleanly unmount before deleting mountdir.

⭐ Future Improvements

• Add write support
• Add multiple files
• Add directory hierarchy
• Implement deletion and rename operations