R/O root

[Henry Spencer]

> ... If you make pipedev != rootdev on such a
> system, you will not be able to create pipes until the pipe device
> is mounted...

It's trivial to fix things so that the system uses pipedev if and only if
it is mounted, and rootdev otherwise.  We made pipedev a small RAM disk;
the effect on system performance was quite noticeable.
-- 
Those who do not understand Unix are |  Henry Spencer @ U of Toronto Zoology
condemned to reinvent it, poorly.    | {allegra,ihnp4,decvax,utai}!utzoo!henry