On Sat, Nov 22, 2025 at 09:59:10AM -0000, Michael van Elst wrote: > [email protected] (Chris Hanson) writes: > > >Should FFS on NetBSD be automatically compatible with FFS on Ultrix and = > >SunOS? > > The various FFS flavours are not compatible. Partially because details > have deviated, partially because validation routines don't handle > legacy defaults or previosly undefined values.
Our code was definitely able to mount Ultrix filesystems on little endian 32-bit hosts. I don't know if it was ever tested on a little endian 64-bit host. Finding the filesystem could be a bit of pain because we never to my knowledge had a kernel option to enable Ultrix disklabel support on any platform other than pmax. So if this doesn't work now, it's a regression. It even reliably worked read/write without corruption for many, many years. Ultrix filesystems are essentially just 4.2BSD; if we can't mount theirs, we probably can't safely mount "our own" from that era either. -- Thor Lancelot Simon [email protected] "The liberties...lose much of their value whenever those who have greater private means are permitted to use their advantages to control the course of public debate." -John Rawls
