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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

  parent reply	other threads:[~2011-06-14  6:48 UTC|newest]

Thread overview: 69+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-12 17:11 pm loss development Raffaele Recalcati
2011-05-12 17:11 ` [PATCH 1/4] export bus_kset Raffaele Recalcati
2011-05-12 19:28   ` Rafael J. Wysocki
2011-05-12 19:28   ` Rafael J. Wysocki
2011-05-13 17:11     ` Davide Ciminaghi
2011-05-13 17:11     ` Davide Ciminaghi
2011-05-15 14:13       ` Davide Ciminaghi
2011-05-15 14:13       ` [linux-pm] " Davide Ciminaghi
2011-05-17 23:04         ` Rafael J. Wysocki
2011-05-17 23:04         ` Rafael J. Wysocki
2011-05-12 17:11 ` Raffaele Recalcati
2011-05-12 17:11 ` [PATCH 2/4] PM / Loss: power loss management Raffaele Recalcati
2011-05-12 17:11 ` Raffaele Recalcati
2011-05-12 19:57   ` Rafael J. Wysocki
2011-05-13 13:02     ` Davide Ciminaghi
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
2011-05-19 20:52             ` Rafael J. Wysocki
2011-05-19 14:25           ` Alan Stern
2011-05-19  9:26         ` Davide Ciminaghi
2011-05-17 23:32       ` Rafael J. Wysocki
2011-05-12 19:57   ` 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 ` Raffaele Recalcati
2011-05-12 17:11 ` [PATCH 4/4] DaVinci: vpfe: " Raffaele Recalcati
2011-05-12 17:11 ` 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  3:12           ` [linux-pm] " mark gross
2011-05-18 19:43             ` Rafael J. Wysocki
2011-05-18 19:43             ` [linux-pm] " Rafael J. Wysocki
2011-05-18 22:17               ` Mark Brown
2011-05-18 22:17               ` Mark Brown
2011-05-19 12:45               ` mark gross
2011-05-19 12:45               ` [linux-pm] " mark gross
2011-06-02 22:21               ` Pavel Machek [this message]
2011-06-14 14:06                 ` mark gross
2011-06-14 14:06                 ` [linux-pm] " mark gross
2011-06-14 14:36                   ` Alan Cox
2011-06-14 14:36                   ` Alan Cox
2011-06-02 22:21               ` Pavel Machek
2011-05-17 23:07         ` Rafael J. Wysocki
2011-05-14 16:35       ` mark gross
2011-05-14 20:21       ` Raffaele Recalcati
2011-05-14 20:21       ` Raffaele Recalcati
2011-05-17 23:10         ` Rafael J. Wysocki
2011-05-17 23:10         ` Rafael J. Wysocki
2011-05-13 16:54     ` Rafael J. Wysocki
2011-05-13  6:39   ` Raffaele Recalcati
2011-05-14 18:53   ` Oliver Neukum
2011-05-14 18:53   ` [linux-pm] " Oliver Neukum
2011-05-14 20:34     ` Raffaele Recalcati
2011-05-14 20:34     ` [linux-pm] " Raffaele Recalcati
2011-05-17 23:06       ` Rafael J. Wysocki
2011-05-17 23:06       ` Rafael J. Wysocki
2011-05-12 19:27 ` Rafael J. Wysocki
2011-05-14 16:24 ` [linux-pm] " mark gross
2011-05-14 20:30   ` Raffaele Recalcati
2011-05-14 20:30   ` [linux-pm] " Raffaele Recalcati
2011-05-14 23:33     ` mark gross
2011-05-14 23:33     ` mark gross
2011-05-14 16:24 ` mark gross

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