linux-kernel - Re: [RFC v2 1/3] block: Introduce blk_bio_map

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Date:	Mon, 6 Jun 2016 13:03:22 +0800
From:	Baolin Wang <baolin.wang@...aro.org>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	Alasdair G Kergon <agk@...hat.com>,
	Mike Snitzer <snitzer@...hat.com>,
	"open list:DEVICE-MAPPER (LVM)" <dm-devel@...hat.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	David Miller <davem@...emloft.net>,
	Eric Biggers <ebiggers3@...il.com>,
	Joonsoo Kim <js1304@...il.com>, tadeusz.struk@...el.com,
	smueller@...onox.de, Masanari Iida <standby24x7@...il.com>,
	Shaohua Li <shli@...nel.org>,
	Dan Williams <dan.j.williams@...el.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Sagi Grimberg <sagig@...lanox.com>,
	Kent Overstreet <kent.overstreet@...il.com>,
	Keith Busch <keith.busch@...el.com>, Tejun Heo <tj@...nel.org>,
	Ming Lei <ming.lei@...onical.com>,
	Mark Brown <broonie@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	linux-crypto@...r.kernel.org, linux-block@...r.kernel.org,
	"open list:SOFTWARE RAID (Multiple Disks) SUPPORT" 
	<linux-raid@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC v2 1/3] block: Introduce blk_bio_map_sg() to map one bio

On 3 June 2016 at 22:35, Jens Axboe <axboe@...nel.dk> wrote:
> On 05/27/2016 05:11 AM, Baolin Wang wrote:
>>
>> In dm-crypt, it need to map one bio to scatterlist for improving the
>> hardware engine encryption efficiency. Thus this patch introduces the
>> blk_bio_map_sg() function to map one bio with scatterlists.
>>
>> For avoiding the duplicated code in __blk_bios_map_sg() function, add
>> one parameter to distinguish bio map or request map.
>
>
> Just detach the bio in blk_bio_map_sg() instead of adding a separate case
> (and argument) for it in __blk_bios_map_sg().

Make sense.

>
> --
> Jens Axboe
>



-- 
Baolin.wang
Best Regards