Date: Sun, 18 May 2003 23:13:17 -0700 From: David Schultz <das@FreeBSD.org> To: Andre Guibert de Bruet <andy@siliconlandmark.com> Cc: current@FreeBSD.org Subject: Re: 5.1-BETA umount problems Message-ID: <20030519061317.GA4755@HAL9000.homeunix.com> In-Reply-To: <20030519015841.R28986@alpha.siliconlandmark.com> References: <20030518225640.S28986@alpha.siliconlandmark.com> <200305190317.h4J3H0M7066994@gw.catspoiler.org> <20030519131646J.matusita@jp.FreeBSD.org> <20030519051855.GB4396@HAL9000.homeunix.com> <20030519015841.R28986@alpha.siliconlandmark.com>
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On Mon, May 19, 2003, Andre Guibert de Bruet wrote: > > 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. If you want to be able to unmount /foo/bar before unmounting /foo, mount /foo/bar as /foo_bar instead, and create a symlink.
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