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

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Message-ID: <87vdisq7bh.fsf@rimspace.net>
Date:	Wed, 07 Oct 2009 13:14:10 +1100
From:	Daniel Pittman <daniel@...space.net>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	"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

Henrique de Moraes Holschuh <hmh@....eng.br> writes:
> On Wed, 07 Oct 2009, Rafael J. Wysocki wrote:
>> On Wednesday 07 October 2009, Henrique de Moraes Holschuh wrote:
>> > On Tue, 06 Oct 2009, Rafael J. Wysocki wrote:
>> > > > You do sync file-systems before entering the hibernation, don't you?
>> > > 
>> > > Yes, a sync is there, but it is not effective on some filesystems.
>> > 
>> > Which ones?
>> 
>> XFS for one example.
>
> Interesting.  So XFS is not only a Bad Idea for /, but also for anything
> that might enter S3/S4.  Not nice.  I sure hope it doesn't do a
> half-assed job of flushing and checkpointing itself during machine
> shutdown/restart like it apparently does when told to "sync" before
> S3/S4...

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?

        Daniel
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