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From: Richard Weinberger <richard@nod.at>
To: Subodh Nijsure <snijsure@grid-net.com>
Cc: linux-mtd@lists.infradead.org, Heinz.Egger@linutronix.de,
	tglx@linutronix.de, tim.bird@am.sony.com,
	linux-kernel@vger.kernel.org, dedekind1@gmail.com
Subject: Re: [RFC v4] UBI: Fastmap support (aka checkpointing)
Date: Tue, 15 May 2012 20:10:01 +0200	[thread overview]
Message-ID: <4FB29BF9.7050200@nod.at> (raw)
In-Reply-To: <4FB296EA.5090104@grid-net.com>

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


  reply	other threads:[~2012-05-15 18:10 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-05-15 17:11 [RFC v4] UBI: Fastmap support (aka checkpointing) Richard Weinberger
2012-05-15 17:11 ` [PATCH 1/7] [RFC] UBI: Export next_sqnum() Richard Weinberger
2012-05-16 13:01   ` Artem Bityutskiy
2012-05-21 13:34     ` Richard Weinberger
2012-05-21 14:00       ` Artem Bityutskiy
2012-05-21 14:16         ` Richard Weinberger
2012-05-22  8:23           ` Artem Bityutskiy
2012-05-22 10:58       ` Artem Bityutskiy
2012-05-16 14:03   ` Shmulik Ladkani
2012-05-16 14:27     ` Artem Bityutskiy
2012-05-17  9:45       ` Shmulik Ladkani
2012-05-17 11:44         ` Artem Bityutskiy
2012-05-17 11:47           ` Richard Weinberger
2012-05-17 12:34             ` Artem Bityutskiy
2012-05-15 17:11 ` [PATCH 2/7] [RFC] UBI: Export compare_lebs() Richard Weinberger
2012-05-16 14:09   ` Shmulik Ladkani
2012-05-15 17:11 ` [PATCH 3/7] [RFC] UBI: Add fastmap on-flash layout Richard Weinberger
2012-05-15 17:11 ` [PATCH 4/7] [RFC] UBI: Add fastmap structs to ubi_device Richard Weinberger
2012-05-15 17:11 ` [PATCH 5/7] [RFC] UBI: Make wl subsystem fastmap aware Richard Weinberger
2012-05-15 17:11 ` [PATCH 6/7] [RFC] UBI: Implement fastmapping support Richard Weinberger
2012-05-15 17:11 ` [PATCH 7/7] [RFC] UBI: Wire up fastmap support Richard Weinberger
2012-05-15 17:48 ` [RFC v4] UBI: Fastmap support (aka checkpointing) Subodh Nijsure
2012-05-15 18:10   ` Richard Weinberger [this message]
2012-05-15 18:02 ` Richard Weinberger
2012-05-15 19:46 ` Shmulik Ladkani
2012-05-16  6:54   ` Fastmap - please, review and test Artem Bityutskiy
2012-05-16 11:51     ` Richard Weinberger
2012-05-16  9:38 ` [RFC v4] UBI: Fastmap support (aka checkpointing) Artem Bityutskiy
2012-05-16  9:42   ` Artem Bityutskiy
2012-05-16 10:50   ` Richard Weinberger
2012-05-16 11:09     ` Artem Bityutskiy
2012-05-16 11:18       ` Artem Bityutskiy
2012-05-16 11:29         ` Richard Weinberger

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