linux-kernel - Re: [PATCH V4] Allow SysRq emergency thaw to thaw frozen filesystems

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Message-ID: <20090203212129.GI24173@disturbed>
Date:	Wed, 4 Feb 2009 08:21:29 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Jamie Lokier <jamie@...reable.org>
Cc:	Eric Sandeen <sandeen@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	t-sato@...jp.nec.com
Subject: Re: [PATCH V4] Allow SysRq emergency thaw to thaw frozen
	filesystems

On Tue, Feb 03, 2009 at 11:48:29AM +0000, Jamie Lokier wrote:
> Eric Sandeen wrote:
> > The timeout thaw originally proposed did not get merged, but
> > perhaps something like this would be useful in emergencies.
> > 
> > For example, freeze /path/to/mountpoint may freeze your
> > root filesystem if you forgot that you had that unmounted.
> 
> If you don't have console access, you're just logged in remotely, is
> there a way to do an emergency unthaw from a shell command?
                                 ^^^^^^
That's a freeze, right? ;)

Anyway, I think you could use /proc/sysrq-trigger in that situation.

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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