linux-kernel - Re: [PATCH 1/15] block copy: initial XCOPY offload support

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Message-ID: <alpine.LRH.2.02.1407181034001.13630@file01.intranet.prod.int.rdu2.redhat.com>
Date:	Fri, 18 Jul 2014 10:35:04 -0400 (EDT)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	Tomas Henzl <thenzl@...hat.com>
cc:	"Alasdair G. Kergon" <agk@...hat.com>,
	Mike Snitzer <msnitzer@...hat.com>,
	Jonathan Brassow <jbrassow@...hat.com>,
	Edward Thornber <thornber@...hat.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Jens Axboe <axboe@...nel.dk>,
	Christoph Hellwig <hch@...radead.org>, dm-devel@...hat.com,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH 1/15] block copy: initial XCOPY offload support



On Fri, 18 Jul 2014, Tomas Henzl wrote:

> > +	if (src_sector + nr_sects < src_sector ||
> > +	    dst_sector + nr_sects < dst_sector)
> > +		return -EINVAL;
> 
> Hi Mikulas,
> this^ is meant as an overflow test or what is the reason?
> Thanks, Tomas

Yes. It is a test for overflow.

Mikulas
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