linux-kernel - Re: UBI fastmap updates

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Message-ID: <20120802200326.37a2d827@spider.haslach.nod.at>
Date:	Thu, 2 Aug 2012 20:03:26 +0200
From:	Richard Weinberger <richard@....at>
To:	artem.bityutskiy@...ux.intel.com
Cc:	Tim Bird <tim.bird@...sony.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"adrian.hunter@...el.com" <adrian.hunter@...el.com>,
	"Heinz.Egger@...utronix.de" <Heinz.Egger@...utronix.de>,
	"thomas.wucher@...utronix.de" <thomas.wucher@...utronix.de>,
	"shmulik.ladkani@...il.com" <shmulik.ladkani@...il.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"Marius.Mazarel@...l.ro" <Marius.Mazarel@...l.ro>,
	"nyoushchenko@...sta.com" <nyoushchenko@...sta.com>
Subject: Re: UBI fastmap updates

Am Thu, 02 Aug 2012 20:59:28 +0300
schrieb Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>:
> > How much PEB should be reserved? 2 x sizeof(fastmap)? 
> 
> Is there any reason why it cannot be the _exact_ maximum number? Not
> more and not less.

The fastmap size is an exact number. 
 
> If I understand correctly, fastmap size is a function of total PEBs
> count. You should be able to calculate the maximum size precisely.

It does.
I was thinking of 2 x sizeof(fastmap) to have reserved PEBs for the
currently used fastmap and PEBs for the new to be installed fastmap.

Thanks,
//richard

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