Re: Static UBI volumes and ubiupdatevol ?

[Artem Bityutskiy <dedekind1@gmail.com>]

On Fri, 2010-12-17 at 10:33 +0100, Ricard Wanderlof wrote:
> > The same with UBIFS - we never write when we are mounted R/O. There are
> > many ubifs_assert()s to check this as well.
> 
> ... but UBI might still do writes during the course of scrubbing I guess, 
> unless ...

Yes, you are right.

> > >  so it is possible to use a 
> > > simple checksum to verify data integrity.
> > 
> > You can do this with UBIFS I think, did not try though.
> 
> What I meant was 'a simple checksum on the raw mtd partition', which can't 
> work with UBIFS as the UBI erase counters etc can change over time as a 
> result of scrubbing.

Ah, yes, you see, you know the things quite well yourself :-)

> I guess I could read from the /dev/ubix_y device to just get the raw UBIFS 
> data which shouldn't change even in the event of scrubbing? Or should I 
> use gluebi to get both a raw mtd partition corresponding to the raw UBIFS 
> data, as well as using UBIFS (on /dev/ubix_y) for the file system?

No, gluebi is not needed, it would just give you an /dev/mtdZ device
with contents equivalent to /dev/ubiX_Y

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)