linux-ext4 - Re: freeze

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Message-ID: <506F19E6.8030005@redhat.com>
Date:	Fri, 05 Oct 2012 12:33:26 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Prashant Shah <pshah.mumbai@...il.com>
CC:	linux-ext4@...r.kernel.org
Subject: Re: freeze_bdev hangs

On 10/5/12 6:58 AM, Prashant Shah wrote:
> Hi,
> 
> I am writing a filter driver for ext3 in which it replaces the block
> device request queue 'make_request_fn' with the driver custom
> function. Calling freeze_bdev() or freeze_super() before replacing the
> 'make_request_fn' hangs the kernel. What am I doing wrong ? Will this
> method work ?

I haven't looked at your custom code, but freeze has changed a bit lately,
and "hangs" is a very vague description

For starters I'd try a sysrq-w when the system "hangs" and see where things
are at, that would offer you some clues.

-Eric
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