linux-kernel - Re: [PATCH for-2.6.37] block: max hardware sectors limit wrapper

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Message-ID: <yq1wrn92s8x.fsf@sermon.lab.mkp.net>
Date:	Thu, 16 Dec 2010 18:49:18 -0500
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Jens Axboe <jaxboe@...ionio.com>
Cc:	Mike Snitzer <snitzer@...hat.com>,
	Lars Ellenberg <lars.ellenberg@...bit.com>,
	device-mapper development <dm-devel@...hat.com>,
	Mikulas Patocka <mpatocka@...hat.com>,
	linux-kernel@...r.kernel.org, Alasdair G Kergon <agk@...hat.com>,
	stable@...nel.org
Subject: Re: [PATCH for-2.6.37] block: max hardware sectors limit wrapper

>>>>> "Mike" == Mike Snitzer <snitzer@...hat.com> writes:

Mike> Implement blk_limits_max_hw_sectors() and make
Mike> blk_queue_max_hw_sectors() a wrapper around it.

Mike> DM needs this to avoid setting queue_limits' max_hw_sectors and
Mike> max_sectors directly.  dm_set_device_limits() now leverages
Mike> blk_limits_max_hw_sectors() logic to establish the appropriate
Mike> max_hw_sectors minimum (PAGE_SIZE).  Fixes issue where DM was
Mike> incorrectly setting max_sectors rather than max_hw_sectors (which
Mike> caused dm_merge_bvec()'s max_hw_sectors check to be ineffective).

Acked-by: Martin K. Petersen <martin.petersen@...cle.com>

Jens, please apply.

-- 
Martin K. Petersen	Oracle Linux Engineering
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