is read-write nullfs safe?

[Xin LI]

Rong-en Fan wrote:
> I'm running 6.2-RELEASE, and I am wondering
> if using nullfs w/ rw is safe in a production environment?
> My impression is that ro nullfs is ok, but not rw.
> Is this still the case?

nullfs is quite stable from my impression at least for my workload.  We
use it for some heavily loaded package building environment.  The old
unionfs implementation may have some problems.

Cheers,