autoclean mode for tmpfs

[David Holland <dholland-tech%netbsd.org@localhost>]

So I just had an idea: since cleaning /tmp on a live system is very
dangerous unless done so (and even then somewhat dangerous), plus
there are other possible uses for automatically disappearing files:

How hard would it be to add a mount option for tmpfs to automatically
drop files after a given timeout? It seems to me that it shouldn't be
very difficult, but I haven't looked at the tmpfs innards in a while.

Anyone think this is worthwhile?

-- 
David A. Holland
dholland%netbsd.org@localhost