From: Mike Frysinger <vapier@gentoo.org>
To: Phillip Susi <psusi@ubuntu.com>
Cc: Thomas Orgis <thomas-forum@orgis.org>, util-linux@vger.kernel.org
Subject: Re: losetup -d --force for zombie loop devices?
Date: Mon, 30 Apr 2012 16:07:21 -0400 [thread overview]
Message-ID: <201204301607.22712.vapier@gentoo.org> (raw)
In-Reply-To: <4F9EF01B.9040003@ubuntu.com>
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On Monday 30 April 2012 16:03:39 Phillip Susi wrote:
> On 4/17/2012 4:03 AM, Thomas Orgis wrote:
> > I am having an issue with a loop device that used to be connected to a
> > file on NFS. Not sure if this is actually a kernel bug, but I assume
> > (perhaps ignorantly so) that losetup could resolve the situation
> > anyways.
> >
> > 0. have NFS share on /mnt/nfs (rw,users,noexec,nosuid,nodev,hard,intr)
> > 1. losetup --show -f /mnt/nfs/file.img
> >
> > /dev/loop0
> >
> > # actually, it was using cryptsetup luksOpen/Close
> > 2. mount /dev/loop0&& do_work&& umount /dev/loop0
> > 3. loose connection to NFS server (it went offline, client machine
> > (laptop) switched networks ...) 4. umount -l /mnt/nfs
>
> This is the problem with umount -l: all it does is remove the path from
> the namespace, leaving the device still mounted. Unfortunately umount
> -f is not properly supported. The proper fix for this is to have the
> kernel support umount -f, and do away with the brain damaged umount -l.
`umount -l` has its place -- there are cases where you want those semantics.
granted, most people actually want a `umount -f`, but the two aren't mutually
exclusive.
-mike
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next prev parent reply other threads:[~2012-04-30 20:06 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-17 8:03 losetup -d --force for zombie loop devices? Thomas Orgis
2012-04-17 14:58 ` Mike Frysinger
2012-04-17 21:02 ` Thomas Orgis
2012-04-30 20:03 ` Phillip Susi
2012-04-30 20:07 ` Mike Frysinger [this message]
2012-05-01 15:23 ` Phillip Susi
2012-05-03 4:43 ` Mike Frysinger
2012-05-03 14:29 ` Phillip Susi
2013-01-11 23:52 ` Mike Frysinger
2013-01-12 0:54 ` Phillip Susi
2013-01-12 4:52 ` Mike Frysinger
2013-01-12 5:13 ` Phillip Susi
2013-01-12 5:29 ` Mike Frysinger
2013-01-14 8:35 ` Karel Zak
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