linux-kernel - Re: forced umount?

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Message-ID: <20070326112127.GA3097@ojjektum.uhulinux.hu>
Date:	Mon, 26 Mar 2007 13:21:27 +0200
From:	Pozsar Balazs <pozsy@...linux.hu>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Mike Snitzer <snitzer@...il.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: forced umount?

On Sun, Mar 18, 2007 at 08:16:19PM +0100, Arjan van de Ven wrote:
> On Fri, 2007-03-16 at 23:06 -0500, Mike Snitzer wrote:
> > I'm interested in understanding the state of Linux with regard to
> > _really_ forcing a filesystem to unmount.
> > 
> > There is a (stale) project at OSDL that has various implementations:
> > http://developer.osdl.org/dev/fumount/
> 
> 
> the problem with the people who say they want forced umount is.. that
> most of the time they either want
> 1) get rid of the namespace entry
> or
> 2) want to stop any and all IO to a certain device/partition 
> 
> 1) is already supported with lazy umount (umount -l)
> for 2), it's not forced umount that they want, it's really an IO
> disconnect (which scsi supports btw in 2.6 kernels).


Could please tell me more about this IO disconnect?
How to trigger it etc, any pointers welcome.


thanks,
-- 
pozsy
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