From: Alasdair G Kergon <agk@redhat.com>
To: Chris Mason <chris.mason@oracle.com>
Cc: Mikulas Patocka <mpatocka@redhat.com>,
device-mapper development <dm-devel@redhat.com>,
ak@linux.intel.com,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Jens Axboe <jens.axboe@oracle.com>
Subject: Re: [dm-devel] Barriers still not passing on simple dm devices...
Date: Thu, 9 Apr 2009 11:28:51 +0100 [thread overview]
Message-ID: <20090409102851.GT5688@agk.fab.redhat.com> (raw)
In-Reply-To: <1239240440.11220.3.camel@think.oraclecorp.com>
On Wed, Apr 08, 2009 at 09:27:20PM -0400, Chris Mason wrote:
> I'm afraid expecting barriers forever in the future isn't completely
> compatible with dm or md. Both of these allow the storage to change
> over time, and the filesystem needs to handle this without corruptions.
The missing piece of the jigsaw is notification to upper layers *ahead*
of such reconfigurations. (We have similar notification issues when
devices are resized - the current approach is to leave the sysadmin
responsible for co-ordinating changes through userspace.)
Alasdair
--
agk@redhat.com
next prev parent reply other threads:[~2009-04-09 10:29 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-23 19:04 Eric Sandeen
2009-03-23 19:10 ` Eric Sandeen
2009-03-24 14:02 ` [dm-devel] " Mikulas Patocka
2009-03-24 14:05 ` Jens Axboe
2009-03-24 14:26 ` Mikulas Patocka
2009-03-24 14:30 ` Jens Axboe
2009-03-24 14:45 ` Mikulas Patocka
2009-03-24 15:05 ` Jens Axboe
2009-03-25 15:15 ` Mikulas Patocka
2009-03-25 15:27 ` Jens Axboe
2009-03-25 22:39 ` Mikulas Patocka
2009-03-26 8:42 ` Jens Axboe
2009-03-31 3:39 ` Mikulas Patocka
2009-03-31 10:49 ` Jens Axboe
2009-04-02 23:40 ` Mikulas Patocka
2009-04-03 8:11 ` Jens Axboe
2009-04-04 15:20 ` Ric Wheeler
2009-04-05 1:28 ` Theodore Tso
2009-04-05 11:54 ` Ric Wheeler
2009-04-06 1:14 ` Lee Revell
2009-04-06 1:24 ` Ric Wheeler
2009-04-08 12:44 ` Mikulas Patocka
2009-04-08 15:16 ` Henrique de Moraes Holschuh
2009-04-09 4:22 ` Eric Sandeen
2009-04-08 12:36 ` Mikulas Patocka
2009-04-08 12:54 ` Mikulas Patocka
2009-04-09 10:48 ` Ric Wheeler
2009-04-08 13:37 ` Mikulas Patocka
2009-04-08 14:06 ` Jens Axboe
2009-04-08 23:44 ` Dave Chinner
2009-04-09 1:27 ` Chris Mason
2009-04-09 10:28 ` Alasdair G Kergon [this message]
2009-03-26 12:55 ` Chris Mason
[not found] <ciXHh-39c-37@gated-at.bofh.it>
[not found] ` <cjfuL-6vJ-43@gated-at.bofh.it>
[not found] ` <cjfEl-6J2-45@gated-at.bofh.it>
[not found] ` <cjfNX-6Wh-27@gated-at.bofh.it>
2009-03-26 13:05 ` Bodo Eggert
[not found] ` <cjfXx-78D-9@gated-at.bofh.it>
[not found] ` <cjg7h-7lM-29@gated-at.bofh.it>
[not found] ` <cjgqC-80G-21@gated-at.bofh.it>
[not found] ` <cjD3I-22U-7@gated-at.bofh.it>
[not found] ` <cjDdE-2g3-31@gated-at.bofh.it>
[not found] ` <cjJVv-4vp-13@gated-at.bofh.it>
[not found] ` <cjXlS-uM-1@gated-at.bofh.it>
2009-03-26 15:26 ` Bodo Eggert
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