linux-kernel - Re: UBI fastmap updates

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Message-ID: <20120817154332.3496d709@spider.haslach.nod.at>
Date:	Fri, 17 Aug 2012 15:43:32 +0200
From:	Richard Weinberger <richard@....at>
To:	artem.bityutskiy@...ux.intel.com
Cc:	nyoushchenko@...sta.com, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org, adrian.hunter@...el.com,
	Heinz.Egger@...utronix.de, thomas.wucher@...utronix.de,
	shmulik.ladkani@...il.com, tglx@...utronix.de,
	tim.bird@...sony.com, Marius.Mazarel@...l.ro
Subject: Re: UBI fastmap updates

Am Fri, 17 Aug 2012 16:41:24 +0300
schrieb Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>:

> On Fri, 2012-08-17 at 15:33 +0200, Richard Weinberger wrote:
> > Am Fri, 17 Aug 2012 16:11:55 +0300
> > schrieb Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>:
> > > We do not do anything like this in UBI because UBI does not need
> > > this, it does not have any complex data structures on the media.
> > > 
> > > With fastmap - I am unsure. I think it is not a problem, because
> > > probably you never append more data, you just re-write everything,
> > > right?
> > 
> > Yep, the on-flash fastmap is immutable.
> 
> Here the question is - if you have PEB containing fastmap data,
> half-filled. Will you ever add more data there to the empty space in
> the PEB or not?
> 

No, data is never added to a half-filled PEB.
Fastmap does not share PEBs with other sub-systems by design.

Thanks,
//richard
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