From: Pavel Machek <pavel@ucw.cz>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: markgross@thegnar.org,
Raffaele Recalcati <lamiaposta71@gmail.com>,
linux-pm@lists.linux-foundation.org,
davinci-linux-open-source@linux.davincidsp.com,
linux-kernel@vger.kernel.org
Subject: Re: [linux-pm] pm loss development
Date: Fri, 3 Jun 2011 00:21:11 +0200 [thread overview]
Message-ID: <20110602222111.GA15414@ucw.cz> (raw)
In-Reply-To: <201105182143.13237.rjw@sisk.pl>
Hi!
> > > What do you mean by safe state?
> > >
> > 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).
Journalling filesystem should survive power loss at random time, as
long as block device behaves like a disk (i.e. writes whole sectors).
And that can be guaranteed at driver level...
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2011-06-14 6:48 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-12 17:11 Raffaele Recalcati
2011-05-12 17:11 ` [PATCH 1/4] export bus_kset Raffaele Recalcati
2011-05-12 19:28 ` Rafael J. Wysocki
2011-05-13 17:11 ` Davide Ciminaghi
2011-05-15 14:13 ` [linux-pm] " Davide Ciminaghi
2011-05-17 23:04 ` Rafael J. Wysocki
2011-05-12 17:11 ` [PATCH 2/4] PM / Loss: power loss management Raffaele Recalcati
2011-05-12 19:57 ` Rafael J. Wysocki
2011-05-13 13:02 ` Davide Ciminaghi
2011-05-17 23:32 ` Rafael J. Wysocki
2011-05-19 9:26 ` Davide Ciminaghi
2011-05-19 14:25 ` [linux-pm] " Alan Stern
2011-05-19 20:52 ` Rafael J. Wysocki
2011-05-12 17:11 ` [PATCH 3/4] mmc: bus and block device drivers: support for pm_loss Raffaele Recalcati
2011-05-12 17:11 ` [PATCH 4/4] DaVinci: vpfe: " Raffaele Recalcati
2011-05-12 19:27 ` pm loss development Rafael J. Wysocki
2011-05-13 6:39 ` Raffaele Recalcati
2011-05-13 16:54 ` Rafael J. Wysocki
2011-05-14 16:35 ` [linux-pm] " mark gross
2011-05-17 23:07 ` Rafael J. Wysocki
2011-05-18 3:12 ` mark gross
2011-05-18 19:43 ` Rafael J. Wysocki
2011-05-18 22:17 ` Mark Brown
2011-05-19 12:45 ` mark gross
2011-06-02 22:21 ` Pavel Machek [this message]
2011-06-14 14:06 ` mark gross
2011-06-14 14:36 ` Alan Cox
2011-05-14 20:21 ` Raffaele Recalcati
2011-05-17 23:10 ` Rafael J. Wysocki
2011-05-14 18:53 ` [linux-pm] " Oliver Neukum
2011-05-14 20:34 ` Raffaele Recalcati
2011-05-17 23:06 ` Rafael J. Wysocki
2011-05-14 16:24 ` mark gross
2011-05-14 20:30 ` Raffaele Recalcati
2011-05-14 23:33 ` mark gross
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