linux-kernel - Re: [PATCH 002 of 5] Replace bio_data with blk_rq

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Date:	Thu, 16 Aug 2007 17:15:57 +1000
From:	Neil Brown <neilb@...e.de>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	linux-kernel@...r.kernel.org, Tejun Heo <htejun@...il.com>
Subject: Re: [PATCH 002 of 5] Replace bio_data with blk_rq_data

On Thursday August 16, jens.axboe@...cle.com wrote:
> On Thu, Aug 16 2007, NeilBrown wrote:
> > 
> > Almost every call to bio_data is for the first bio
> > in a request.  A future patch will add some accounting
> > information to 'struct request' which will need to be
> > used to find the start of the request in the bio.
> > So replace bio_data with blk_rq_data which takes a 'struct request *'
> > 
> > The one exception is in dm-emc were using
> >    page_address(bio->bi_io_vec[0].bv_page);
> > is appropriate.
> 
> This (and 3+4) just look like preparatory patches if we want to merge
> the full patchset, not bug fixes. I seem to recall you had more bug
> fixes or cleanups in your patchset, maybe I was mistaken. So nak for now
> for 2-4, I'd apply 5 but it depends on the previous.
> 

I don't remember other bug fixes, but I'll look through and check.

2 and 3 are very simple changes that - I think - make it clearer what
is happening.

And I felt 5 was a sufficient improvement to justify it and 4...

I'll go hunting and see what other preliminaries I can find.

NeilBrown
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