linux-kernel - Need help in writing Layered driver in Linux

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Message-ID: <B57F74065657FA4F85110272279E461B016F6F19@BGEEXC07.asiapacific.cpqcorp.net>
Date:	Sun, 5 Nov 2006 12:20:48 +0530
From:	"Palakodeti, Srinivasa Rao (STSD)" <palakodetisrinivasa.rao@...com>
To:	<linux-kernel@...r.kernel.org>
Subject: Need help in writing Layered driver in Linux

Hi All, 

I want to write a layered driver for a device in Linux. I am overwriting
make_request_fn in blk_dev strucure. Whenever they is an I/O my
make_request_fn is called so that I can change the buffer_head and send
to other disk by calling submit_bh in my make_request_fn as following.

		bh->b_dev = MKDEV(252,0); // I am changing to other disk
device
		atomic_set(&bh->b_count, 1);
		submit_bh(WRITE, bh);

This is not working. It is giving me kernel panic Could you help me how
should I go about it? 

My purpose is all I/O to Disk1 should to passed to Disk2. 

Regards,
Srinivas 
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