Filesystem based on extended filesystem. EXT0fs does not have full functionality provided by production-level filesystems, and does not intend to. This is for educational purposes only.
EXT0-fs has been ran on an older linux version(v4.15). The VM base image in the Vagrantfile already runs this version. It has also been ran on linux v6.2.
The entire filesystem is mapped into block groups of fixed sizes. Each group has the superblock as the first block. The block descriptor follows the superblock, which is then followed by the inode block. The bitmap block follows the inode block. Data blocks follow next. Each block group has 12 data blocks by default. The root directory is by default the 2 inode or block group.
There is only one inode per block group and one descriptor block per group. The superblock is at exactly 1024 bytes from the start of the device blocks/sector.
DO NOT run directly on your machine. This is so that you do not brick your system. The recommended way to install is inside a VM. A dummy Vagrantfile is provided to easily provision one locally.
Pending tasks:
- Deleting directory
- Renaming directory
vagrant up # when ran the first time
If you encounter an issue with networking as below
No renderers compatible with netplan are available on guest. Please install
a compatible renderer.
This can be fixed with the following steps
First, ssh into the VM
vagrant ssh
Next, enable systemd-networkd service
sudo service systemd-networkd start
sudo systemctl enable systemd-networkd
exit # exit to host
Lastly, restart the VM[Ignore compilation warnings]
vagrant reload
The filesystem should now be mounted at /home/vagrant/testdir
Try it out:
sudo su
cd /home/vagrant/testdir
mkdir dir1 dir2 dir3 # new directory
ls -la # directory details
ls -i # get inode number
touch file1
nano file1 # write to file; ctrl+x to save
ls -lai # see entry details in the current directory
Append the --provision flag if you need to re-run the setup commands
To uninstall the filesystem(normal user)
sudo make unmount
sudo make uninstall