linux-kernel - Re: [PATCH 0/5] sg

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Message-Id: <200712201853.48643.rusty@rustcorp.com.au>
Date:	Thu, 20 Dec 2007 18:53:48 +1100
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	jens.axboe@...cle.com, dougg@...que.net
Subject: Re: [PATCH 0/5] sg_ring for scsi

On Thursday 20 December 2007 18:07:41 FUJITA Tomonori wrote:
> On Thu, 20 Dec 2007 16:45:18 +1100
>
> Rusty Russell <rusty@...tcorp.com.au> wrote:
> > OK, some fixes since last time, as I wade through more SCSI drivers. 
> > Some drivers use "use_sg" as a flag to know whether the request_buffer is
> > a scatterlist: I don't need the counter, but I still need the flag, so I
> > fixed that in a more intuitive way (an explicit ->sg pointer in the cmd).
>
> use_sg and the request_buffer will be removed shortly.
>
> http://marc.info/?l=linux-scsi&m=119754650614813&w=2

Thanks!  Is there a git tree somewhere with these changes?

> I think that we tried the similar idea before, scsi_sgtable, but we
> seem to settle in the current simple approach.

Yes, a scsi-specific solution is a bad idea: other people use sg.  
Manipulating the magic chains is horrible; it looks simple to the places 
which simply want to iterate through it, but it's awful for code which wants 
to create them.

Cheers,
Rusty.
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