linux-kernel - Re: forced umount?

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Message-id: <200703170124.42956.gene.heskett@gmail.com>
Date:	Sat, 17 Mar 2007 01:24:40 -0400
From:	Gene Heskett <gene.heskett@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	"Mike Snitzer" <snitzer@...il.com>, linux-fsdevel@...r.kernel.org
Subject: Re: forced umount?

On Saturday 17 March 2007, 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/
>
>Its fairly clear that these efforts (e.g. badfs patches) haven't been
>given serious consideration for upstream inclusion.  Do others see
>value in the ability to _reliably_ force a umount by having Linux
>discard all IOs, open files, dirty inode buffers, etc of a "bad"
>blockdevice?  The goal is to not impact the availability or integrity
>of Linux while doing so.
>
>Is this forced umount work even considered worthwhile by the greater
>Linux community?  Is anyone actively working on this?

Having been 'caught out' on this subject more than a few times, usually by 
shutting down a remotely located box that was mounted via smb or cifs, 
and found the only way to get sanity back to the rest of the system was a 
hard reset of every other box that was also sharing that mount, I would 
think this is a worthwhile project.

Take that as a yes vote, from somebody who isn't franchised to vote on it 
in the first place, I'm just a user, usually playing the part of the 
canary in the coal mine.

>Mike

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
QOTD:
	"There may be no excuse for laziness, but I'm sure looking."
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