linux-kernel - Re: [PATCH 8/8] blk-map: reimplement blk_rq_map_user() using blk_rq_map_user

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Date:	Wed, 01 Apr 2009 22:03:39 +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, tj@...el.org
Subject: Re: [PATCH 8/8] blk-map: reimplement blk_rq_map_user() using blk_rq_map_user_iov()

FUJITA Tomonori wrote:
> No, we are not talking about blk_rq_append_bio().
> 
> We are talking about the multiple bio handling in blk_rq_map_user,
> which is the feature that Mike added long time ago. The feature is
> surely necessary for some users. So you can't remote it.

How would someone use that without blk_rq_append_bio()?  The only
reason blk_rq_map_user() had multiple bio chaining was to work around
BIO_MAX_SIZE.  blk_rq_map_user_iov() doesn't support multiple bio
chaining, so sans blk_rq_append_bio() or playing with rq/bio internals
directly, there's no way to use or even know about multiple bios.

Thanks.

-- 
tejun
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