linux-kernel - Re: [linux-pm] Massive ext4 filesystem corruption after a failed s2disk/ram cycle

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Message-ID: <20091007161604.GA28849@infradead.org>
Date:	Wed, 7 Oct 2009 12:16:04 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Daniel Pittman <daniel@...space.net>
Cc:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	linux-pm@...ts.linux-foundation.org,
	Maxim Levitsky <maximlevitsky@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [linux-pm] Massive ext4 filesystem corruption after a failed
	s2disk/ram cycle

On Wed, Oct 07, 2009 at 01:14:10PM +1100, Daniel Pittman wrote:
> For what it is worth, I would also be quite interested to know /why/ XFS is
> bad in this regard.  Is it just the previously stated "XFS writes to disk
> despite freezing kernel threads" issue, or something deeper?

sync pushes out all data to disk, but in a journaling filesystem that
might just but the log not the "normal" place on disk.  For a boot
loader to deal with it properly it actually needs to do an replay of
the log.  Grub does so for reiserfs but not for XFS for some reason.
I don't know why problems don't trigger more often with ext3, though.
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