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

[FUJITA Tomonori]

On Fri,  4 Mar 2011 06:16:50 +0200
Maxim Levitsky <maximlevitsky@xxxxxxxxx> 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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