nullfs on 5.1

[Florian Weimer]

Tim Robbins wrote:

> One major potential deadlock has been fixed since the release of 5.1. If 
> you find a reproducible way of deadlocking nullfs on  5.2 or a -current 
> snapshot less than 6 months old, submit a bug report.

Thanks, I'll try to build RELENG_5_2.

> >Is nullfs essentially unsuported, or is it just broken?  What's the
> >status of unionfs (the manpage is rather discouraging).
> >
> > 
> >
> Nullfs is unsupported, but works well except for a few outstanding bugs 
> (e.g. accessing some kinds of special files on the lower layer through 
> the upper layer causes a panic).

So I should be safe if I copy /dev?  Good to know.