Cannot mount / from UFS labels

[Ulrich Spörlein]

On Fri, 21.08.2009 at 09:41:30 -0500, Rick C. Petty wrote:
> On Fri, Aug 21, 2009 at 03:17:23PM +0200, Ulrich Spörlein wrote:
> > 
> > I'm not sure this ever worked for 7.x but now I need to have the same
> 
> It sure does, for me at least:
> 
> /dev/ufs/home on /home (ufs, NFS exported, local, soft-updates)
> /dev/ufs/mm on /mm (ufs, NFS exported, local, noatime, soft-updates)
> /dev/ufs/mm-flac on /mm/flac (ufs, NFS exported, local, noatime, read-only)
> /dev/ufs/mm-music on /mm/music (ufs, NFS exported, local, noatime, read-only)
> /dev/ufs/mm-video on /mm/video (ufs, NFS exported, local, noatime, soft-updates)
> /dev/ufs/mm-video-tv on /mm/video/tv (ufs, local, noatime, soft-updates)
> /dev/ufs/sw on /sw (ufs, local, noatime, soft-updates)
> /dev/ufs/sw-bsd on /sw/bsd (ufs, NFS exported, local, noatime, soft-updates)
> /dev/ufs/sw-images on /sw/images (ufs, NFS exported, local, noatime, read-only)
> /dev/ufs/backup on /backup (ufs, local, noatime, soft-updates)

Well, there's no / ...

> > # tunefs -L root / (in single user)
> > then updated /etc/fstab and rebooted
> 
> Was / mounted read-write at the time?  After the tunefs, you should have
> seen some messages on the console related to the labels.

Not quite, the dmesg spammage has been quenched in RELENG_8 and the
label *did* show up in dumpfs and /dev/ufs. But I now tried again, and
re-mounting the / filesystem r/w makes the label go away.

So I guess I need to boot a live system first and have the label created
from "outside". Now where is that USB stick ...

Uli