[PATCH 2/2] UBIFS: add unstable pages problem description

[Artem Bityutskiy]

On Mon, 2010-10-18 at 13:02 +0300, Artem Bityutskiy wrote:
> From: Artem Bityutskiy <Artem.Bityutskiy at nokia.com>
> 
> Describe a problem reported by Matthieu CASTET which is currently
> not handled by UBIFS.
> 
> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy at nokia.com>

Matthiew, are you happy with this description? Does it properly reflect
your findings? Could you please correct, if not?

I'm starting working on your problem. Since I do not have much time,
I'll do a little everyday, but hope to come up with some patches this
week already. The thing is that it is a lot of work. We need to go
through a lot of UBI/UBIFS subsystems and analyze them.

Why a lot of work? Because we assumed everywhere we can rely on CRC - if
it is correct, we are safe. However, according to you this is not
reliable for unstable pages - you do not have guarantee that next time
you read it you will get correct data.

Also, I do not have HW to test this, so I expect you to help by testing,
are your testing set-ups kept ready? :-)

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)