u3forge / logfs

A simple kernel-space filesystem that logs everything.

logfs

logfs is a simple kernel-space filesystem that logs everything. Heavily based on and inspired by .

The file "Resources" has some links to resources that may be useful to understand how things work.

Features

• Skeleton of the project has been set.
• You can only mount the filesystem, you do any other operations.

Compilation

• Install linux kernel source:

Ubuntu and its derivatives

# apt update && apt install linux-source

Arch and its derivatives

# pacman -Sy linux-headers

• Run make:

Make sure that your working directory contains the files from this repo, then run make.

Testing

• Create a dummy image to mount.

$ dd bs=1M count=100 if=/dev/zeo of=image

• Create a mount directory.

$ mkdir mount

• Switch to root

$ sudo su

• Insert the kernel module.

# insmod simplefs.ko

• Check that it has been succesfuly inserted.

Run dmesg You should find: "Sucessfully registered logfs".

• Mount the image.

mount -o loop -t logfs image mount/

This mounts the image to the mount folder.

The -t option specifies the filesystem.

• Check that it has been succesfuly mounted

Run dmesg You should find: "logfs is succesfully mounted on [/dev/loop1]".

• Change the directory into mount.

cd mount/

• List the contents of the directory (Does nothing for now).

ls

and then return to the parent directory.

cd ..

• Unmount the image

umount mount/ Check with dmesg, you should find "logfs superblock is destroyed. Unmount succesful.".

• Remove the kernel module

rmmod logfs.ko Check with dmesg, you should find "Sucessfully unregistered logfs.".