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To: Viren Patel <virenp@mail.utexas.edu>,  questions@freebsd.org
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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
Date: 24 Mar 2006 13:47:33 -0500
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Subject: Re: FreeBSD 6.1 - mount_nullfs broken?
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Kris Kennaway <kris@obsecurity.org> writes:

> On Fri, Mar 24, 2006 at 12:39:30PM -0600, Viren Patel wrote:
> > > On Fri, Mar 24, 2006 at 08:05:31AM -0600, Viren Patel
> > > wrote:
> > >
> > >> # umount /export/jails/testjail/dev
> > >> # mount_nullfs -o ro /export/jails/basejail
> > >> /export/jails/testjail/basejail
> > >> mount_nullfs: Operation not supported by device
> > >>
> > >> After looking at the dmesg output more closely one
> > >> discrepancy I found was the second last line:
> > >>
> > >> ad6: 238475MB <WDC WD2500JS-55MHB0 02.01C03> at
> > >> ata3-master SATA300
> > >>
> > >> It was definitely SATA150 under FreeBSD 6.0, even after
> > >> updates. So maybe a problem in the SATA300 driver?
> > >
> > > Unlikely.  It looks like you don't have kernel nullfs
> > > support enabled.
> > >
> > > Kris
> > >
> > 
> > I am using the generic kernel. Looking through /etc there
> > is nothing regarding enabling nullfs. I also looked at
> > GENERIC kernel conf file without luck. How do I enable
> > nullfs?
> 
> Compile it into your kernel or load the module.  Read the handbook for
> more help.

Or you could come at it the other way; figure out how you did it when
you were running 6.0.  The procedure has not changed.