From: Prashant Shah <pshah.mumbai@gmail.com>
Subject: Re: freeze_bdev hangs
Date: Fri, 12 Oct 2012 21:38:15 +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 Wed, Oct 10, 2012 at 3:19 AM, Jan Kara <jack@suse.cz> wrote:
>   OK. There are several ways how I could imagine you hit ino == 0. Either
> someone is using direct IO or inode is a block device inode...
>

Fixed one of the issues. It turn out that printk() in the request
function cause the /var/log/messages file to be updated that resulted
in more block copies in request function which in turn triggered more
printk's.

I will check the direct IO operations and report back.

Regards.