linux-kernel - Re: [PATCH]: Rename REQ_COPY_USER to more descriptive REQ_HAS_TAIL_SPACE_FOR

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Message-ID: <20090709181713.GQ23611@kernel.dk>
Date:	Thu, 9 Jul 2009 20:17:13 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Vladislav Bolkhovitin <vst@...b.net>
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	scst-devel@...ts.sourceforge.net, Tejun Heo <tj@...nel.org>,
	Boaz Harrosh <bharrosh@...asas.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Subject: Re: [PATCH]: Rename REQ_COPY_USER to more descriptive
	REQ_HAS_TAIL_SPACE_FOR_PADDING

On Thu, Jul 09 2009, Vladislav Bolkhovitin wrote:
> Currently names of REQ_COPY_USER and __REQ_COPY_USER constants are confusing,
> because they actually mean that the buffer for the corresponding requests
> has space in the tail for padding in case of DMA padding restrictions.

No, that's not what it means, the fact that there's padding room is a
side effect of the map type. So I'd suggest adding a comment above that
if {} in blk_rq_map_sg(), something that should have been there from the
beginning.

-- 
Jens Axboe

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