OPERATING SYSTEM Project

Implement a simple ramdisk module 

Ramdisk Module

Due date: Dec. 11th, 23:59

In this final project, you will implement a simple ramdisk module that you can format with
“mkfs.ext2” and mount and unmount with “mount” and “umount”. The ram disk should be of a
fixed size stored entirely in memory. It should appear as a block device in the system.

This project is an example of a block device driver, which handles data a block at a time.

Your project should satisfy the following requirements.

– Implement a ramdisk as a kernel module.
– Allow an ext2 filesystem to be installed onto the ramdisk.
– Allow the filesystem to be mounted and unmounted with “mount” and “unmount”.

Tips:

Here are some tips that may help.

– This link (​http://www.tldp.org/LDP/lkmpg/2.6/html/lkmpg.html​) will help you get started writing a
module.

– This link (​http://www.cs.uni.edu/~diesburg/courses/cop4610_fall10/week06/week6 ​) is a
little dated (for instance, the current kernel is at version 5.x and this link describes things for
2.6), but it will also help.

– Chapter 16 of this book (​https://lwn.net/Kernel/LDD3/​) describes what you’re trying to do. That
chapter is outdated and the block device layer has changed significantly, but reading that
chapter is a good starting point.

– This article (​https://lwn.net/Articles/58719/​) describes some of the changes to the block layer.

– This article (​https://opensourceforu.com/2012/02/device-drivers-disk-on-ram-block-drivers/​)
has a more up-to-date example. Don’t just copy and paste or use code that you don’t
understand. It’s easy to spot projects that are blatantly ripped-off, even if you rename variables.

http://www.tldp.org/LDP/lkmpg/2.6/html/lkmpg.html

http://www.cs.uni.edu/~diesburg/courses/cop4610_fall10/week06/week6

https://lwn.net/Kernel/LDD3/

https://lwn.net/Articles/58719/

Device Drivers, Part 15: Disk on RAM — Playing with Block Drivers