linux-kernel - Re: [linux-pm] pm loss development

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Message-ID: <20110518221726.GC20909@sirena.org.uk>
Date:	Wed, 18 May 2011 23:17:26 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	markgross@...gnar.org, Raffaele Recalcati <lamiaposta71@...il.com>,
	linux-pm@...ts.linux-foundation.org,
	davinci-linux-open-source@...ux.davincidsp.com,
	linux-kernel@...r.kernel.org
Subject: Re: [linux-pm] pm loss development

On Wed, May 18, 2011 at 09:43:13PM +0200, Rafael J. Wysocki wrote:
> On Wednesday, May 18, 2011, mark gross wrote:

> > I need to get more details on this but I assume its a state where the
> > meta data of the file system is committed to the emmc before lights go
> > off such that when power is reapplied that the damage isn't too big. 

> I don't think you can guarantee that the metadata won't be damaged
> without notifying the filesystem of the event (and making it react
> appropriately).

I guess with a journalling filesystem you'd hope that you can at any
point write out what's in flight and have it be safe; if it's a non
journalling filesystem of course all bets are off.
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