KissFS is a filesystem that is intentionally kept simple. It does not employ complicated data structures or fancy algorithms in an attempt to be safer or faster. Instead the goal is to avoid bugs and to be able to repair a damaged filesystem better.
Because no matter how good your filesystem is a bit toggler in ram or read error from disk will bring it down. Shit happens. KissFS concentrates on what to do now, on putting Humpty-Dumpty back together again.
KissFS source is licensed under the GPLv3 and available via git:
git clone http://mrvn.homeip.net/git/kissfs
Or directly browesable: KissFS GitWeb