On Thu, 20 Feb 2020 18:39:21 +0100, Valentin Vidic said:

> Now that you mention 2.6 :), I've been trying to update this uxfs
> filesystem from an old book[1] for modern kernels:
>
>   https://github.com/vvidic/uxfs/
>
> It currently builds and seems to work but it could probably use a
> review if someone has a bit of time?  I can post the diff here if
> that would be easier.

Do you have an actual uxfs filesystem to test against?  Having the
mkfs.uxfs and fsck.uxfs utilities would be useful as well.