Opensourceing XFS

Licensing questions
Opensource or not?
Community doesn't care about proprtary drivers
Filesystem API changes a lot
Not GPL-compatible code won't be merged into mainline

Enncumbrance review
Contact as much as possible original hackers
Compare with other codebases (SVR4, BSD, ..)
keywords search
prototype comparism
Very few matches found and corrected
usually removal of uneeded code