Re: [RFC][PATCH] PM / Sleep: Freeze filesystems during system suspend/hibernation

From: Nigel Cunningham
Date: Wed Feb 01 2012 - 22:17:43 EST


On 29/01/12 00:45, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@xxxxxxx>
> Freeze all filesystems during system suspend and (kernel-driven)
> hibernation by calling freeze_supers() for all superblocks and thaw
> them during the subsequent resume with the help of thaw_supers().
> This makes filesystems stay in a consistent state in case something
> goes wrong between system suspend (or hibernation) and the subsequent
> resume (e.g. journal replays won't be necessary in those cases). In
> particular, this should help to solve a long-standing issue that, in
> some cases, during resume from hibernation the boot loader causes the
> journal to be replied for the filesystem containing the kernel image
> and/or initrd causing it to become inconsistent with the information
> stored in the hibernation image.
> The user-space-driven hibernation (s2disk) is not covered by this
> change, because the freezing of filesystems prevents s2disk from
> accessing device special files it needs to do its job.
> This change is based on earlier work by Nigel Cunningham.
> Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>

Acked-by: Nigel Cunningham <nigel@xxxxxxxxxxxx>

(Or reviewed by or whatever :> I'm out of the loop too much, and don't
remember what the right one is!)

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