linux-kernel - Re: [PATCH 1/6] UBI: Fastmap: Care about the protection queue

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Message-ID: <54B0489D.1050905@nod.at>
Date:	Fri, 09 Jan 2015 22:31:09 +0100
From:	Richard Weinberger <richard@....at>
To:	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
	dedekind1@...il.com
CC:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] UBI: Fastmap: Care about the protection queue

Am 09.01.2015 um 22:23 schrieb Ezequiel Garcia:
> On 11/24/2014 10:20 AM, Richard Weinberger wrote:
>> Fastmap can miss a PEB if it is in the protection queue
>> and not jet in the used tree.
> 
> s/jet/yet
> 
>> Treat every protected PEB as used.
>>
> 
> I'm wondering if we can have a detailed description of the issues this
> commit fixes (if any?). In other words, what's the result of *not*
> having the patch?

Without this patch fastmap can miss one PEB.
As consequence of this during attach the fastmap self-check
will detect this inconsistency and will fall back to a full scan.
If you try to attach using a custom fastmap implementation (found in
bootloaders) which do often not have sophisticated self-checks you'll
face a serious data corruption or if you're lucky UBI will crash.

Now clearer? :-)

Thanks,
//richard
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