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Date:      Mon, 19 May 2003 02:06:37 -0400 (EDT)
From:      Andre Guibert de Bruet <andy@siliconlandmark.com>
To:        David Schultz <das@freebsd.org>
Cc:        current@freebsd.org
Subject:   Re: 5.1-BETA umount problems
Message-ID:  <20030519015841.R28986@alpha.siliconlandmark.com>
In-Reply-To: <20030519051855.GB4396@HAL9000.homeunix.com>
References:  <20030518225640.S28986@alpha.siliconlandmark.com> <20030519131646J.matusita@jp.FreeBSD.org> <20030519051855.GB4396@HAL9000.homeunix.com>

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On Sun, 18 May 2003, David Schultz wrote:

> On Mon, May 19, 2003, Makoto Matsushita wrote:
> >
> > truckman> IMHO, "umount -f /lib" should have failed in this case.
> >
> > I don't think so.  -f means 'force', so it should be successed even if
> > this cause something trouble to running system.  If it would be
> > unacceptable, there's easy way to solve it: don't use -f anymore, or
> > add a new umount(8) option to do that.
>
> umount -f can be extremely useful on a multiuser system when you
> *really* want to unmount a filesystem regardless of who might be
> trying to use it.  However, it also makes it easy to shoot
> yourself in the foot.  If it only fails in situations where you
> are absolutely guaranteed to shoot yourself in the foot, that's
> fine.  There's no reason it should allow someone to unmount a
> filesystem that contains a mountpoint for another mounted
> filesystem.
>
> By the way, why is the original poster walking around and shooting
> himself in the foot?  Sigh.  The dangers of firearms...

I wanted to unmount as many filesystems as possible before connecting my
Dazzle 6-in-1 USB reader (the one that used to work, but now causes
panics). As you can imagine fsck'ing 650GB takes a little while... ;)
Also, /lib on this system is nfs exported, and I couldn't be arsed to kill
-9 nfsd and mountd.

> Andre Guibert de Bruet | Enterprise Software Consultant >
> Silicon Landmark, LLC. | http://siliconlandmark.com/    >




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