linux-kernel - Re: [dm-devel] dm: dm-cache fails to write the cache device in writethrough mode

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Message-ID: <20130323211308.GC30269@agk-dp.fab.redhat.com>
Date:	Sat, 23 Mar 2013 21:13:08 +0000
From:	Alasdair G Kergon <agk@...hat.com>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	device-mapper development <dm-devel@...hat.com>,
	Heinz Mauelshagen <heinzm@...hat.com>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Joe Thornber <ejt@...hat.com>,
	Mikulas Patocka <mpatocka@...hat.com>
Subject: Re: [dm-devel] dm: dm-cache fails to write the cache device in
	writethrough mode

On Fri, Mar 22, 2013 at 10:15:49PM -0700, Darrick J. Wong wrote:
> Interesting ... if I set up this:
> # echo "0 67108864 linear /dev/sda 0" | dmsetup create origin
> And then repeat the test, but using /dev/mapper/origin as the origin instead
> of /dev/sda, the problem goes away.
 
So that looks like an easy and correct workaround for now.

Alasdair

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