It was a research proof-of-princple. (i.e.. partly principled and
partly really hacky. My list of its issues was pretty long.)

(If A mounted B's file system somewhere, and B mounted A's, then the
directory tree was infinite. That's mathematics, not a bug.)

On Wed, Aug 13, 2025 at 11:56 AM Larry McVoy <lm@mcvoy.com> wrote:
>
> On Wed, Aug 13, 2025 at 10:18:34AM -0400, Dan Cross wrote:
> > On Wed, Aug 13, 2025 at 10:00???AM Douglas McIlroy
> > <douglas.mcilroy@dartmouth.edu> wrote:
> > > I was always sorry that Peter Weinberger's RFS never made it outside
> > > Bell Labs. It allowed networking between separately administered
> > > systems by mapping UIDs.
> >
> > I believe it did?  If I recall correctly, it was available with System
> > V, though perhaps I am misremembering.
>
> Sunos had it, my office mate ported it.  I was unimpressed, it worked well
> between the same archs but was riddled with byte order problems and
> ioctl calls that were not portable.