linux-kernel - Re: [xfs-masters] Re: freeze vs freezer

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Date:	Thu, 03 Jul 2008 14:43:00 -0500
From:	Eric Sandeen <sandeen@...deen.net>
To:	xfs-masters@....sgi.com
CC:	Christoph Hellwig <hch@...radead.org>,
	Dave Chinner <david@...morbit.com>,
	Elias Oltmanns <eo@...ensachen.de>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Kyle Moffett <mrmacman_g4@....com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	David Chinner <dgc@....com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [xfs-masters] Re: freeze vs freezer

Rafael J. Wysocki wrote:

>>> I talked with Jens about it on a very general level, but it seems doable at
>>> first sight.
>> Why would you hack the blok layer when we already have a perfectly fine
>> facility to archive what you want?  freeze_bdev is there exactly for the
>> purpose to make the filesystem consistant on disk and then freeze all
>> I/O.
> 
> We tried that in the past and it didn't work very well due to some bad
> interactions with the md layer that we wanted to stay functional while we
> were saving the image.

Hm, details or a link?

> Also, do all of the supported filesystems implement this feature?


ext3, ext4, gfs2, jfs, reiserfs, xfs, all provide a write_super_lockfs
op, which is what freeze_bdev uses.  I think that the rest is generic,
for simpler filesystems.

-Eric
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