Re: [PATCH RFC 1/2] block: Add blk_bio_map_sg() helper

[Tejun Heo <tj@xxxxxxxxxx>]

On Wed, Jun 13, 2012 at 03:41:46PM +0800, Asias He wrote:
> Add a helper to map a bio to a scatterlist, modelled after
> blk_rq_map_sg.
> 
> This helper is useful for any driver that wants to create
> a scatterlist from its ->make_request_fn method.

This may not be possible but I really wanna avoid having two copies of
that complex logic.  Any chance blk_rq_map_bio() can be implemented in
a way that allows blk_rq_map_sg() can be built on top of it?  Also,
please include proper docbook style function comment on new public API
functions.

Thanks.

-- 
tejun
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