linux-kernel - Re: [PATCH] block: separate out padding from alignment

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Date:	Mon, 03 Mar 2008 12:27:07 -0600
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Tejun Heo <htejun@...il.com>
Cc:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>, tomof@....org,
	jens.axboe@...cle.com, efault@....de, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-scsi@...r.kernel.org, jgarzik@...ox.com
Subject: Re: [PATCH] block: separate out padding from alignment

On Mon, 2008-03-03 at 15:10 +0900, Tejun Heo wrote:
> Block layer alignment was used for two different purposes - memory
> alignment and padding.  This causes problems in lower layers because
> drivers which only require memory alignment ends up with adjusted
> rq->data_len.  Separate out padding such that padding occurs iff
> driver explicitly requests it.

This puts the libsas SMP handler back into a working state again.

Thanks,

James


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