linux-kernel - Re: [PATCH 14/17] scsi: replace custom rq mapping with blk_rq_map_kern

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Message-Id: <20090414093401V.fujita.tomonori@lab.ntt.co.jp>
Date:	Tue, 14 Apr 2009 09:44:31 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	petkovbb@...il.com
Cc:	fujita.tomonori@....ntt.co.jp, tj@...nel.org, bharrosh@...asas.com,
	James.Bottomley@...senpartnership.com, linux-scsi@...r.kernel.org,
	axboe@...nel.dk, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 14/17] scsi: replace custom rq mapping with
	blk_rq_map_kern_sgl()

On Mon, 13 Apr 2009 14:59:12 +0200
Borislav Petkov <petkovbb@...glemail.com> wrote:

> Hi,
> 
> On Mon, Apr 13, 2009 at 07:07:58PM +0900, FUJITA Tomonori wrote:
> > On Mon, 13 Apr 2009 18:38:23 +0900
> > Tejun Heo <tj@...nel.org> wrote:
> > 
> > > FUJITA Tomonori wrote:
> > > >> I thought that was agreed and done? What is left to do for that to go
> > > >> in.
> > > > 
> > > > I've converted all the users (sg, st, osst). Nothing is left. So we
> > > > don't need this.
> > > 
> > > Yeah, pulled it.  Okay, so we can postpone diddling with request
> > > mapping for now.  I'll re-post fixes only from this and the previous
> > > patchset and proceed with other patchsets.
> > 
> > To be honest, I don't think that we can clean up the block
> > mapping. For example, blk_rq_map_kern_prealloc() in your patchset
> > doesn't look cleanup to me. It's just moving a hack from ide to the
> > block (well, I have to admit that I did the same thing when I
> > converted sg/st/osst...).
> 
> Well, since blk_rq_map_kern_prealloc() is going to be used only in
> ide-cd (driver needs it to queue a sense request from within the irq
> handler) and since it is considered a hack I could try to move it out of
> the irq handler

It's quite nice if you could do that.

But I think that ide-atapi also needs blk_rq_map_kern_prealloc().

> and do away only with blk_rq_map_kern() if that is more
> of an agreeable solution?

Yeah, blk_rq_map_kern() is much proper.
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