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Date:      Fri, 19 Mar 2010 20:54:37 +0100
From:      Roland Smith <rsmith@xs4all.nl>
To:        Steve Franks <bahamasfranks@gmail.com>
Cc:        FreeBSD Mailing List <freebsd-questions@freebsd.org>
Subject:   Re: tunefs -L issue
Message-ID:  <20100319195437.GA54241@slackbox.erewhon.net>
In-Reply-To: <539c60b91003191221g59364484l89c4c140780677a4@mail.gmail.com>
References:  <539c60b91003140931o1f0d2d00u7ff7f5d021718b7c@mail.gmail.com> <20100314170012.GA38210@slackbox.erewhon.net> <539c60b91003190802l54e91581pb393dce81d0be76e@mail.gmail.com> <20100319165708.GA71392@slackbox.erewhon.net> <539c60b91003191221g59364484l89c4c140780677a4@mail.gmail.com>

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On Fri, Mar 19, 2010 at 12:21:27PM -0700, Steve Franks wrote:
> On Fri, Mar 19, 2010 at 9:57 AM, Roland Smith <rsmith@xs4all.nl> wrote:
> > On Fri, Mar 19, 2010 at 08:02:10AM -0700, Steve Franks wrote:
> >> Wait a second. =A0What do I have to do, mount single user to find the
> >> darn things? =A0They have completely disappeared, not even a
> >> 'GEOM_LABEL: Label ufsid/482b3a7c20b36d8c removed' in dmesg! (thought
> >> I was previously seeing that on shutdown, not startup, now neither)
> >
> > The following command looks also in the old messages files;
> >
> > =A0 =A0bzgrep 'Label for.*ufsid' /var/log/messages.* | less
> >
> >> Even in single user mode, root is already mounted, so I'm never going
> >> to find the label for it. =A0I'm afraid man geom is just leaving me
> >> guessing (see below). =A0geom label doesn't seem to think I have any
> >> disks...
> >>
> >> Handbook:
> >>
> >> % glabel status
> >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Name =A0Status =A0Components
> >> ufsid/486b6fc38d330916 =A0 =A0 N/A =A0ad4s1d
> >> ufsid/486b6fc16926168e =A0 =A0 N/A =A0ad4s1f
> >>
> >> Local:
> >>
> >> [steve@fyre /usr/home/steve]$ glabel status
> >> =A0 =A0 =A0 =A0 =A0 Name =A0Status =A0Components
> >> iso9660/WALL_E =A0 =A0 N/A =A0acd0
> >> [steve@fyre /usr/home/steve]$
> >>
> >
> > I don't see anything here either on my system.
> >
>=20
>=20
> > Doesn't tunefs -L work? (sorry, can't recall the beginning of this thre=
ad).
>=20
> Apparently, but only in single-user mode. =20

According to tunefs(8) you should be able to run it on a filesystem that has
been made read-only.

You can make a mounted filesystem read-only with 'mount -u -r <filesystem>'=
=2E=20
You can afterwards make it read/write again with 'mount -u -w <filesystem>'=
=2E=20

> I think my problem is more
> one of documentation.  The handbook is rather obtuse on the subject.
> The inability to even locate or read the labels on a mounted system is
> about as un-POLS as I've come across lately....

The ufsid labels are automatically removed from a filesystem when it is
mounted. So it is not surprising that no ufsid labels are found on a running
system. And IIRC, the automatic ufsid labels are a new feature. The handbook
might be slightly behind the times.
=20
Roland
--=20
R.F.Smith                                   http://www.xs4all.nl/~rsmith/
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