linux-kernel - Re: [PATCH 7/8] blk-map: let blk_rq_map_user

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Date:	Wed, 01 Apr 2009 21:03:23 +0900
From:	Tejun Heo <tj@...nel.org>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	axboe@...nel.dk, bharrosh@...asas.com, linux-kernel@...r.kernel.org
Subject: Re: [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@...nel.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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