linux-kernel - Re: [RFC v4] UBI: Fastmap support (aka checkpointing)

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Message-ID: <4FB29BF9.7050200@nod.at>
Date:	Tue, 15 May 2012 20:10:01 +0200
From:	Richard Weinberger <richard@....at>
To:	Subodh Nijsure <snijsure@...d-net.com>
CC:	linux-mtd@...ts.infradead.org, Heinz.Egger@...utronix.de,
	tglx@...utronix.de, tim.bird@...sony.com,
	linux-kernel@...r.kernel.org, dedekind1@...il.com
Subject: Re: [RFC v4] UBI: Fastmap support (aka checkpointing)

Hi Subodh,

Am 15.05.2012 19:48, schrieb Subodh Nijsure:
> Hello Richard,
>
> On 05/15/2012 10:11 AM, Richard Weinberger wrote:
>> v1: https://lwn.net/Articles/481612/
>> v2: https://lwn.net/Articles/496586/
>> v3: Didn't release it to linux-mtd
> Will kernel that has older UBI drivers be able to mount and update the
> UBI volumes that have been created with checkpointing feature?

Of course!

> Say I have bootrom that has 3.0.X kernel that has no knowledge of UBI
> checkpointing, and my flash /dev/mtd2 has UBI volume with checkpointing
> enabled. Will this bootrom be able to attach /dev/mtd2 and mount UBI
> volume and read/write files on it?

Sure!
Your bootrom will scan the UBI volume and detect two unknown internal
volumes with compat=delete in their volume headers.
So, it will delete the two fastmap volumes and continue scanning.
It can alter the volume and so on.

Thanks,
//richard

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