CIFS client updates for auto-reconnect [PSARC/2009/366 FastTrack timeout 06/24/2009]

[Gordon Ross]

> > The door is owned by the user and has mode 0600.
> > That appears to be sufficient to prevent other
> > users from opening these doors.
> 
> Given it is trivial to do so the door server should also check that the 
> calling peer is running with the same creds that it is.  See 
> door_ucred(3C) and ucred_get(3C).

OK, I'm happy to add that.

Thanks,
Gordon