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From: Neil Brown <neilb@cse.unsw.edu.au>
To: Jens Axboe <axboe@suse.de>
Date: Mon, 2 Dec 2002 10:49:43 +1100
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Cc: Srihari Vijayaraghavan <harisri@bigpond.com>, linux-kernel@vger.kernel.org,
       Andrew Morton <akpm@digeo.com>, Arjan van de Ven <arjanv@redhat.com>
Subject: Re: 2.5.49: kernel BUG at drivers/block/ll_rw_blk.c:1950!
In-Reply-To: message from Jens Axboe on Wednesday November 27
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On Wednesday November 27, axboe@suse.de wrote:
> On Wed, Nov 27 2002, Srihari Vijayaraghavan wrote:
> > Hello Neil,
> > 
> > On Wednesday 27 November 2002 07:13, Neil Brown wrote:
> > > Srihari, could you possibly try with the following patch please to see
> > > if it gives more useful information.
> > 
> > No worries. That did the trick.
> > 
> > The following message appears just before the first oops:
> > Nov 27 18:56:32 localhost kernel: bio_add_page: want to add 4096 at 17658 but 
> > only allowed 3072 - prepare to oops...
> 
> Neil, this is the problem. Currently a driver _must_ be able to accept a
> page worth of data at any location...

so raid0 (and linear) need to be able to split a bio .... I think
we've been here before.  Did you say you have plans for some generic
helper code that could do this?

NeilBrown
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