linux-kernel - Re: [PATCH 1/3] SG: Move functions to lib/scatterlist.c and add sg chaining allocator helpers

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Date:	Fri, 21 Dec 2007 20:15:36 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	bharrosh@...asas.com (Boaz Harrosh)
Cc:	jens.axboe@...cle.com, James.Bottomley@...eleye.com,
	akpm@...ux-foundation.org, rusty@...tcorp.com.au,
	fujita.tomonori@....ntt.co.jp, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, dougg@...que.net
Subject: Re: [PATCH 1/3] SG: Move functions to lib/scatterlist.c and add sg chaining allocator helpers

Boaz Harrosh <bharrosh@...asas.com> wrote:
>
> diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
> index 416e000..c3ca848 100644
> --- a/include/linux/scatterlist.h
> +++ b/include/linux/scatterlist.h
> @@ -7,6 +7,12 @@
> #include <linux/string.h>
> #include <asm/io.h>
> 
> +struct sg_table {
> +       struct scatterlist *sgl;        /* the list */
> +       unsigned int nents;             /* number of mapped entries */
> +       unsigned int orig_nents;        /* original size of list */
> +};

If we're making massive changes like this, let's do it properly
as Rusty has demonstrated so that we support back-chaining as
well as frong-chaining.

Thanks,
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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