linux-kernel - Re: MD/DM and barriers (was Re: [patch] ext2/3: document conditions when reliable operation is possible)

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Message-ID: <20090827180942.GA8140@agk-dp.fab.redhat.com>
Date:	Thu, 27 Aug 2009 19:09:42 +0100
From:	Alasdair G Kergon <agk@...hat.com>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Ric Wheeler <rwheeler@...hat.com>, Theodore Tso <tytso@....edu>,
	Rob Landley <rob@...dley.net>, Pavel Machek <pavel@....cz>,
	Florian Weimer <fweimer@....de>,
	Goswin von Brederlow <goswin-v-b@....de>,
	kernel list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, mtk.manpages@...il.com,
	rdunlap@...otime.net, linux-doc@...r.kernel.org,
	linux-ext4@...r.kernel.org, corbet@....net,
	Mikulas Patocka <mpatocka@...hat.com>
Subject: Re: MD/DM and barriers (was Re: [patch] ext2/3: document
	conditions when reliable operation is possible)

On Thu, Aug 27, 2009 at 12:54:05PM -0400, Jeff Garzik wrote:
> DM has some barrier code...  but the above code was pasted from DM's  
> make_request function, so I am guessing that DM's barrier stuff is  
> incomplete and disabled at present.

That code is from the new request-based multipath implementation in 2.6.31
which doesn't yet.

But bio-based dm does support barriers now.  (Just missing some patches to
complete the dm-raid1 support that are still under review IIRC.)

Alasdair
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