linux-kernel - Re: [PATCH RFC 1/2] block: Add blk_bio_map

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Message-ID: <4FD95311.6020507@redhat.com>
Date:	Thu, 14 Jun 2012 10:57:21 +0800
From:	Asias He <asias@...hat.com>
To:	Tejun Heo <tj@...nel.org>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	Jens Axboe <axboe@...nel.dk>, Shaohua Li <shli@...nel.org>,
	Christoph Hellwig <hch@....de>,
	Minchan Kim <minchan.kim@...il.com>
Subject: Re: [PATCH RFC 1/2] block: Add blk_bio_map_sg() helper

On 06/14/2012 10:31 AM, Tejun Heo wrote:
> 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.


OK. Will do. I guess you mean building blk_rq_map_sg() on top of 
blk_bio_map_sg().


-- 
Asias


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