linux-ext4 - freeze

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Message-ID: <CAD6i1f+fzh-z+Xr6V2gHBzq4kmJzPcfre91g=q6fJ7P_5nY0Zw@mail.gmail.com>
Date:	Fri, 5 Oct 2012 17:28:50 +0530
From:	Prashant Shah <pshah.mumbai@...il.com>
To:	linux-ext4@...r.kernel.org
Subject: freeze_bdev hangs

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 ?

full code : https://gist.github.com/3839380

Snippet :

        sb = freeze_bdev(bd);
        if (sb)
                printk(KERN_INFO "filter: freez block device\n");

        if (bd->bd_disk->queue->make_request_fn == filter_mrqfn) {
                printk(KERN_INFO "filter: modules request function is
already active\n");
        } else {
                orig_mrqfn = bd->bd_disk->queue->make_request_fn;
                bd->bd_disk->queue->make_request_fn = filter_mrqfn;
        }
        thaw_bdev(bd, sb);

Please forgive my ignorance, I am a fresher in file systems :)

Regards.
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