linux-kernel - Re: [PATCH 2/8] block: fix SG_IO vector request data length handling

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Message-ID: <20090401122434.GE5178@kernel.dk>
Date:	Wed, 1 Apr 2009 14:24:35 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	tj@...nel.org, bharrosh@...asas.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/8] block: fix SG_IO vector request data length
	handling

On Wed, Apr 01 2009, FUJITA Tomonori wrote:
> On Wed, 1 Apr 2009 13:50:58 +0200
> Jens Axboe <jens.axboe@...cle.com> wrote:
> 
> > On Wed, Apr 01 2009, FUJITA Tomonori wrote:
> > > On Wed,  1 Apr 2009 20:04:38 +0900
> > > Tejun Heo <tj@...nel.org> wrote:
> > > 
> > > > Impact: fix SG_IO behavior such that it matches the documentation
> > > > 
> > > > SG_IO howto says that if ->dxfer_len and sum of iovec disagress, the
> > > > shorter one wins.  However, the current implementation returns -EINVAL
> > > > for such cases.  Trim iovc if it's longer than ->dxfer_len.
> > > 
> > > Is that description about sg's SG_IO?
> > 
> > The more important question is what sg.c actually does, that's more
> > important than the documentation.
> 
> Do you think that Doug is a person who makes such mistake? ;)
> 
> Seems that sg worked as the howto says. But I think that I broke it
> when I converted sg to use the block layer. I'll fix it soon.

OK

> About this patch, as we know, there are lots of subtle differences
> between sg's SG_IO and the block's. I'm not sure that it's a good idea
> to change the behavior of the block's SG_IO.

Depends on what it is. For something like this where the alternative is
returning -EINVAL and the patch makes it work, we definitely should just
do it.

-- 
Jens Axboe

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