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

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Message-Id: <20071220.163058.185565456.davem@davemloft.net>
Date:	Thu, 20 Dec 2007 16:30:58 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	rusty@...tcorp.com.au
Cc:	fujita.tomonori@....ntt.co.jp, 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

From: Rusty Russell <rusty@...tcorp.com.au>
Date: Fri, 21 Dec 2007 10:13:38 +1100

> But, as demonstrated, there are real benefits of having an explicit header:
> 
> 1) It removes the chain-end/explicit count ambiguity (see 
> http://lkml.org/lkml/2007/10/25/209 & thread)
> 2) It allows others to manipulate sg chains, which couldn't be done before
>    (eg. the ATA code which wants to append a padding element).
> 3) I can now hand you an sg ring for you to fill: sg chains can't do that.
> 
> In short, sg_ring is generally useful primitive.  sg chains are a clever hack 
> for scsi_lib to create, and everyone else to read.

I do not refute any of this :-)
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