From: Prashant Shah <pshah.mumbai@gmail.com>
Subject: Re: freeze_bdev hangs
Date: Mon, 8 Oct 2012 22:05:38 +0530
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Cc: Eric Sandeen <sandeen@redhat.com>, linux-ext4@vger.kernel.org
To: Jan Kara <jack@suse.cz>
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Hi,

On Mon, Oct 8, 2012 at 9:49 PM, Jan Kara <jack@suse.cz> wrote:
>   And what tool are you using for monitoring?

I am using printk(). A custom module that changes the make_request_fn
of the block device to a custom callback. In the callback I am
printing the request bio details and passing the bio back to the
original make_request_fn.

Regards.