linux-kernel - Re: [PATCH 1/3] block: Add blk_queue_copy

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Message-ID: <20090918203328.GT23126@kernel.dk>
Date:	Fri, 18 Sep 2009 22:33:28 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Jun'ichi Nomura <j-nomura@...jp.nec.com>
Cc:	Mike Snitzer <snitzer@...hat.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Alasdair G Kergon <agk@...hat.com>,
	David Strand <dpstrand@...il.com>,
	device-mapper development <dm-devel@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] block: Add blk_queue_copy_limits()

On Sat, Sep 19 2009, Jun'ichi Nomura wrote:
> This patch is a preparation for the last patch in this patchset
> which changes blk_set_default_limits() to set 0 to max_sectors.
> 
> dm uses blk_stack_limits() to merge limits of underlying devices
> and copy the end result to the queue.
> But if there's no underlying device (like 'zero' target),
> max_sectors/max_hw_sectors are left unchanged from the default 0
> and just copying it to the queue causes problems.
> 
> Provide blk_queue_copy_limits() to get a safe copy with
> invalid values fixed-up.

Added for 2.6.32.

-- 
Jens Axboe

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