linux-kernel - Re: [GIT PULL] Core block IO bits for 4.2

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Message-ID: <20150626061510.GA15036@xzibit.linux.bs1.fc.nec.co.jp>
Date:	Fri, 26 Jun 2015 06:15:12 +0000
From:	Junichi Nomura <j-nomura@...jp.nec.com>
To:	Jens Axboe <axboe@...com>,
	"torvalds@...uxfoundation.org" <torvalds@...uxfoundation.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Christoph Hellwig" <hch@....de>,
	Mike Snitzer <snitzer@...hat.com>,
	"device-mapper development" <dm-devel@...hat.com>
Subject: Re: [GIT PULL] Core block IO bits for 4.2

Hi Jens,

On 06/25/15 23:37, Jens Axboe wrote:
>       block, dm: don't copy bios for request clones

this change should not be pushed to mainline yet.

Firstly, Christoph has a newer version of the patch that fixes silent
data corruption problem:
  https://www.redhat.com/archives/dm-devel/2015-May/msg00229.html

And the new version still depends on LLDDs to always complete requests
to the end when error happens, while block API doesn't enforce such a
requirement. If the assumption is ever broken, the inconsistency between
request and bio (e.g. rq->__sector and rq->bio) will cause silent data
corruption:
  https://www.redhat.com/archives/dm-devel/2015-June/msg00022.html

-- 
Jun'ichi Nomura, NEC Corporation
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