https://github.com/gotoco/dummyfs

Simple Linux Filesystem designed for learning purposes
https://github.com/gotoco/dummyfs

Last synced: about 10 hours ago
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Simple Linux Filesystem designed for learning purposes

• Host: GitHub
• URL: https://github.com/gotoco/dummyfs
• Owner: gotoco
• Created: 2018-05-14T10:21:58.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2018-05-22T15:00:54.000Z (over 6 years ago)
• Last Synced: 2024-08-03T09:02:28.102Z (4 months ago)
• Language: C
• Size: 2.24 MB
• Stars: 31
• Watchers: 2
• Forks: 10
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Simple implementation of the Linux filesystem

DummyFS is simple implementation of FileSystem with basic on-disk layout.

The main goal of this FS is educational puropse.

## How to start?

Clone repository then specify Linux kernel dir `KDIR` inside Makefile.

```bash

# to create kernel modules

make

# to make mkfs

gcc -o mkfs_dmfs mkfs_dummyfs.c -g

# to create initial filesystem on device i.e. for device /dev/sdb use mkfs

./mkfs_dmfs /dev/sdb

# you can see disk layout in the hex if you will, to do so:

dd if=/dev/sdb bs=1k count=20 | hexdump

# insert kernel module

# (Please mind the fact that it is learning module,

# so good idea is to run it on VM or save all data before!)

insmod ./dmyfs.ko

# Then mount filesystem (again given device /dev/sdb, and mount point /mnt):

mount -t dummyfs /dev/sdb /mnt

# verfy if the fs is mounted properly

mount | grep dummyfs

ls -al /mnt

...

# create file in dummyfs

touch /mnt/test

# do simple 'hello word'

echo hello_from_dummyfs > /mnt/test

cat /mnt/test

...

```

## More resources:

See slide-deck from my presentation "Writing Linux FS4Fun"

```bash

./Documentation/WrittingFS4Fun.pdf

```