From owner-freebsd-stable@FreeBSD.ORG  Wed Jun  8 13:03:34 2011
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
Delivered-To: freebsd-stable@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 407251065673
	for <freebsd-stable@freebsd.org>; Wed,  8 Jun 2011 13:03:34 +0000 (UTC)
	(envelope-from matthias.andree@gmx.de)
Received: from mailout-de.gmx.net (mailout-de.gmx.net [213.165.64.23])
	by mx1.freebsd.org (Postfix) with SMTP id 8EC528FC1A
	for <freebsd-stable@freebsd.org>; Wed,  8 Jun 2011 13:03:33 +0000 (UTC)
Received: (qmail invoked by alias); 08 Jun 2011 13:03:31 -0000
Received: from g230111069.adsl.alicedsl.de (EHLO apollo.emma.line.org)
	[92.230.111.69]
	by mail.gmx.net (mp069) with SMTP; 08 Jun 2011 15:03:31 +0200
X-Authenticated: #428038
X-Provags-ID: V01U2FsdGVkX1/17aFBnkP1UbqCe2Jw/zflt8erwLl17fCqP9GLUF
	9bT7IsvAPJY23L
Received: from [127.0.0.1] (localhost.localdomain [127.0.0.1])
	by apollo.emma.line.org (Postfix) with ESMTP id 99F9723DB2F
	for <freebsd-stable@freebsd.org>; Wed,  8 Jun 2011 15:03:30 +0200 (CEST)
Message-ID: <4DEF7322.8030907@gmx.de>
Date: Wed, 08 Jun 2011 15:03:30 +0200
From: Matthias Andree <matthias.andree@gmx.de>
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US;
	rv:1.9.2.17) Gecko/20110516 Mnenhy/0.8.3 Thunderbird/3.1.10
MIME-Version: 1.0
To: freebsd-stable@freebsd.org
X-Enigmail-Version: 1.1.2
Content-Type: text/plain; charset=ISO-8859-15
Content-Transfer-Encoding: 7bit
X-Y-GMX-Trusted: 0
Subject: labelling root file system (RELENG_8)
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>, 
	<mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 08 Jun 2011 13:03:34 -0000

Greetings,

I've tried to re-label an existing (and up to date) 8-STABLE
installation's root partition.  This failed, tunefs reports it cannot
write the super block.

I have attempted this sequence:

1. reboot (through BIOS and loader) directly into single-user mode
(boot -s)
2. sysctl kern.geom.debugflags=16
3. tunefs -L root /dev/ada0s4a    # that's the dev I mount the root
                                  # partition from

Still no joy => tunefs cannot update the super block.

Remounting / as rw doesn't help, as expected.

The root fs uses softupdates but no journalling -- what other hoops do I
need to jump through to create labels for my root ufs file system?

Thanks.

Best regards,
Matthias