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Date:	Sun, 5 Nov 2006 12:20:48 +0530
From:	"Palakodeti, Srinivasa Rao (STSD)" <>
To:	<>
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
		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. 

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