Testing needed - HAMMER PFS exports via NFS

[Thomas Nikolajsen]

>It should now be possible in HEAD only to export nullfs mounts of
>HAMMER PFS´s.
>
>This needs testing.

Very nice, thank you;
I did some testing, this seems to work,
though a few errors showed up; not sure they are related.

Is null mount meant to be a permanent solution for PFS nfs export?

Testing:
Both nfs server and client running dfly HEAD;
3 PFSs nfs exported: /usr/src, /usr/obj and my home dir;
did some world/kernel building with above nfs mounts.

Errors:
 - on nfs client (GENERIC) - buildkernel did abort
Sep 22 13:15:01 boy kernel: nfs_getpages: error 13
Sep 22 13:15:01 boy kernel: vm_fault: pager read error, pid 75644 (ld)
Sep 22 13:15:01 boy kernel: pid 75644 (ld), uid 0: exited on signal 11

 - on SMP nfs server (from 21:19 also server) - didn´t notice any ill effect
Sep 22 18:24:04 boy kernel: spin_lock: 0xc6087fdc, indefinite wait!
Sep 22 19:08:10 boy kernel: spin_lock: 0xc6087fdc, indefinite wait!
Sep 22 21:37:18 boy kernel: spin_lock: 0xc6087fdc, indefinite wait!
Sep 22 22:03:27 boy kernel: spin_lock: 0xc6087fdc, indefinite wait!

 -thomas