linux-ext4 - Re: [PATCH 4/4] Support discard if at least one underlying device supports it

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Message-ID: <20100702205420.GM23989@agk-dp.fab.redhat.com>
Date:	Fri, 2 Jul 2010 21:54:20 +0100
From:	Alasdair G Kergon <agk@...hat.com>
To:	Mike Snitzer <snitzer@...hat.com>
Cc:	Mikulas Patocka <mpatocka@...hat.com>, dm-devel@...hat.com,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	axboe@...nel.dk, dmonakhov@...nvz.org
Subject: Re: [PATCH 4/4] Support discard if at least one underlying device
	supports it

On Fri, Jul 02, 2010 at 04:47:09PM -0400, Mike Snitzer wrote:

> If a region doesn't support the discard
> DM has no business processing anything related to the discard (barriers
> included).  It is as simple as that.
 
Indeed - if an I/O is going to fail, discover that as early as we can, trying
to avoid the relatively-expensive barrier process whenever we reasonably can.

Alasdair

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