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SubjectRe: [PATCH 7/8] blk-map: let blk_rq_map_user_iov() support null mapping
FUJITA Tomonori wrote:
> On Wed, 1 Apr 2009 20:04:43 +0900
> Tejun Heo <tj@kernel.org> wrote:
>
>> Impact: API expansion
>>
>> Till now, only blk_rq_map() supported null mapping. Add null mapping
>> support to blk_rq_map_user_iov() by moving BIO_NULL_MAPPED setting to
>> bio_copy_user_iov().
>
> Why does blk_rq_map_user_iov() need to support the null mapping?

Because the next patch makes blk_rq_map_user() use it.

--
tejun


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