Hi.
On 29/01/12 00:45, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <[email protected]>
>
> 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 <[email protected]>
Acked-by: Nigel Cunningham <[email protected]>
(Or reviewed by or whatever :> I'm out of the loop too much, and don't
remember what the right one is!)
--
Evolution (n): A hypothetical process whereby improbable
events occur with alarming frequency, order arises from chaos, and
no one is given credit.