From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH for-4.2 2/3] block,
	dm: don't copy bios for	request clones
Date: Wed, 27 May 2015 10:21:57 +0200
Message-ID: <20150527082157.GA25993@lst.de>
References: <1432300445-9543-1-git-send-email-snitzer@redhat.com>
	<1432300445-9543-2-git-send-email-snitzer@redhat.com>
	<556410BB.3000103@ce.jp.nec.com>
Reply-To: device-mapper development <dm-devel@redhat.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <dm-devel-bounces@redhat.com>
Content-Disposition: inline
In-Reply-To: <556410BB.3000103@ce.jp.nec.com>
List-Unsubscribe: <https://www.redhat.com/mailman/options/dm-devel>,
	<mailto:dm-devel-request@redhat.com?subject=unsubscribe>
List-Archive: <https://www.redhat.com/archives/dm-devel>
List-Post: <mailto:dm-devel@redhat.com>
List-Help: <mailto:dm-devel-request@redhat.com?subject=help>
List-Subscribe: <https://www.redhat.com/mailman/listinfo/dm-devel>,
	<mailto:dm-devel-request@redhat.com?subject=subscribe>
Sender: dm-devel-bounces@redhat.com
Errors-To: dm-devel-bounces@redhat.com
To: Junichi Nomura <j-nomura@ce.jp.nec.com>
Cc: Jens Axboe <axboe@kernel.dk>, device-mapper development <dm-devel@redhat.com>, Christoph Hellwig <hch@lst.de>, Mike Snitzer <snitzer@redhat.com>
List-Id: dm-devel.ids

On Tue, May 26, 2015 at 06:20:43AM +0000, Junichi Nomura wrote:
> Not completing bios is not sufficient.
> If you advance the bi_iter to the end, you need to somehow rewind it
> or the re-submission will be incomplete, that would end up as a data
> corruption...

Can you explain which particular case you're worried about?