linux-kernel - Re: [PATCH 1/4] scatterlist: new helper functions

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Message-Id: <20110306162859E.fujita.tomonori@lab.ntt.co.jp>
Date:	Sun, 6 Mar 2011 16:29:44 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	maximlevitsky@...il.com
Cc:	akpm@...ux-foundation.org, James.Bottomley@...senPartnership.com,
	fujita.tomonori@....ntt.co.jp, linux-kernel@...r.kernel.org,
	oakad@...oo.com
Subject: Re: [PATCH 1/4] scatterlist: new helper functions

On Fri,  4 Mar 2011 06:16:50 +0200
Maxim Levitsky <maximlevitsky@...il.com> wrote:

> While developing memstick driver for legacy memsticks
> I found the need in few helpers that I think should be
> in common scatterlist library
> 
> The functions that were added:
> 
> * sg_nents/sg_total_len - iterate over scatterlist to figure
> out total length of memory it covers / number of entries.

You should invent a data structure per I/O request, something like
msb_request structure. Then you can store nents and total_len in
that.

That's what block subsystems and drivers do. I took a look at your
driver but I can't see why your driver can't do the same.
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