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Date: Sun, 9 Jan 2011 08:50:47 -0500 (EST)
From: Rick Macklem <rmacklem@uoguelph.ca>
To: Marek Salwerowicz <salwerom@iem.pw.edu.pl>
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Cc: freebsd-current@freebsd.org, Andrzej Tobola <ato@iem.pw.edu.pl>
Subject: Re: NFSv4 and pam_mount - mounting user home directories.
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 > 
> After manually setting:
> 
> salwerom@freebsd:/etc#sudo sysctl vfs.newnfs.server_max_nfsvers=4
> vfs.newnfs.server_max_nfsvers: 4 -> 4
> salwerom@freebsd:/etc#sudo sysctl vfs.newnfs.server_min_nfsvers=4
> vfs.newnfs.server_min_nfsvers: 4 -> 4
> salwerom@freebsd:/etc#
> 
> We are still able to mount via NFSv3 (even when those two lines are
> commented in sysctl.conf).
> Any other idea.. ?
> 
It just worked for me. Try setting the sysctl before starting nfsd. If
you are starting the daemons manually for a kernel that doesn't have
"options NFSD" do:

# nfsuserd
# mountd -e -r
# sysctl vfs.newnfs.server_min_nfsvers=4
# nfsd -e -u -t -n 8

- mountd -e loads the module, so you can do the sysctl after that and before
  starting the nfsd. (Or build a kernel with "options NFSD" and do the sysctl
  anytime before starting the nfsd.)

rick
ps: I tested the FreeBSD-8 client. Other clients may not even talk to the NFS
   server during mounting. For those, the mount would succeed, but subsequent
   use of the mount won't work.