From owner-freebsd-questions@FreeBSD.ORG  Mon Sep 16 17:45:43 2013
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTP id E063EB28
 for <freebsd-questions@freebsd.org>; Mon, 16 Sep 2013 17:45:43 +0000 (UTC)
 (envelope-from freebsd-questions-local@be-well.ilk.org)
Received: from be-well.ilk.org (be-well.ilk.org [23.30.133.173])
 by mx1.freebsd.org (Postfix) with ESMTP id BABBA2F94
 for <freebsd-questions@freebsd.org>; Mon, 16 Sep 2013 17:45:43 +0000 (UTC)
Received: by be-well.ilk.org (Postfix, from userid 1147)
 id 088D433C49; Mon, 16 Sep 2013 13:45:42 -0400 (EDT)
From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
To: atar <atar.yosef@gmail.com>
Subject: Re: persistence in freeBSD
References: <op.w3iouhlie4gg2u@localhost> <44hadkbs0v.fsf@be-well.ilk.org>
 <op.w3it0tmve4gg2u@localhost>
Date: Mon, 16 Sep 2013 13:45:42 -0400
In-Reply-To: <op.w3it0tmve4gg2u@localhost> (atar's message of "Mon, 16 Sep
 2013 20:32:43 -0000")
Message-ID: <44bo3sbqyh.fsf@be-well.ilk.org>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (berkeley-unix)
MIME-Version: 1.0
Content-Type: text/plain
Cc: freebsd-questions@freebsd.org
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
Reply-To: freebsd-questions@freebsd.org
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 16 Sep 2013 17:45:43 -0000

atar <atar.yosef@gmail.com> writes:
>
> What does the '-u' option do? I've not find in the 'mount' man page
> any explanation on this option.

The man page includes:

     -u      The -u flag indicates that the status of an already mounted file
             system should be changed.  Any of the options discussed above
             (the -o option) may be changed; also a file system can be changed
             from read-only to read-write or vice versa.  An attempt to change
             from read-write to read-only will fail if any files on the file
             system are currently open for writing unless the -f flag is also
             specified.  The set of options is determined by applying the
             options specified in the argument to -o and finally applying the
             -r or -w option.