nullfs stabilization I

[Csaba Henk]

On 2006-01-10, Matthew Dillon <dillon at xxxxxxxxxxxxxxxxxxxx> wrote:
>     (2) Do not have a shadow callback.  Instead have null_nresolve()
> 	call a new function, cache_shadow(), which creates the relationship
> 	between the upper and lower layer namecache records.  Only
> 	null_nresolve() would need the added sophistication.  The other
> 	null_n*() functions would simply remain what they were before.

Maybe even null_nresolve() count stay intact, and have a namecache flag which
directs the cache layer to propagate on shadow associatons upon resolution.

Csaba