ubifs robustness with early power cut warning

[Doug Crawford]

the freeze/thaw sounds like what I need.  I guess using the fsfreeze
tool from util-linux would work?  Is all of that implemented in the
VFS layer?  I see some recent patches for adding UBIFS specific
freeze/thaw functionality?

On Mon, Oct 2, 2017 at 9:45 AM, Richard Weinberger
<richard at sigma-star.at> wrote:
> Am Montag, 2. Oktober 2017, 18:14:28 CEST schrieb Doug Crawford:
>> I think my use case might be a little different. This 500 millisecond
>> early power down warning is intended to be recoverable if the power is
>> restored in that period.  The effect I am looking for is that any new
>> fsync or sync commands made during this 500 ms window will pause or
>> block, but if the power is restored then the sync will be successful.
>
> Hmm, if I understand your correctly, all you need is freeze/thaw support in
> UBIFS.
> Upon power-loss you freeze the filesystem and if power recovers you can thaw
> it.
>
> Does this information help? :-)
>
> Thanks,
> //richard
>
> --
> sigma star gmbh - Eduard-Bodem-Gasse 6 - 6020 Innsbruck - Austria
> ATU66964118 - FN 374287y