On Thu, Jul 09 2009, Vladislav Bolkhovitin wrote:
> Currently names of REQ_COPY_USER and __REQ_COPY_USER constants are confusing,
> because they actually mean that the buffer for the corresponding requests
> has space in the tail for padding in case of DMA padding restrictions.
No, that's not what it means, the fact that there's padding room is a
side effect of the map type. So I'd suggest adding a comment above that
if {} in blk_rq_map_sg(), something that should have been there from the
beginning.
--
Jens Axboe
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