linux-kernel - Re: [PATCH 1/7] [RFC] UBI: Export next

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Date:	Mon, 21 May 2012 15:34:00 +0200
From:	Richard Weinberger <richard@....at>
To:	dedekind1@...il.com
CC:	linux-mtd@...ts.infradead.org, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, Heinz.Egger@...utronix.de,
	tim.bird@...sony.com
Subject: Re: [PATCH 1/7] [RFC] UBI: Export next_sqnum()

On 16.05.2012 15:01, Artem Bityutskiy wrote:
> I started looking at the code, and made some notes at the same time and
> few minor changes - here is the diff which you can apply on top of your
> patches.
>
> diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
> index 2399511..2f5c362 100644
> --- a/drivers/mtd/ubi/build.c
> +++ b/drivers/mtd/ubi/build.c
> @@ -869,15 +869,22 @@ static int attach_by_fastmap(struct ubi_device *ubi)
>
>   	fm_start = ubi_find_fastmap(ubi);
>   	if (fm_start<  0)
> +		/* TODO: instead, return 1 which means that fall-back to
> +		 * scanning is needed */

fm_start is the PEB number of the fastmap super block.
It will return 1 if the super block was found at PEB 1.
That's why it returns a negative values in case of an error.

> +	/* TODO: Before checking version - check the CRC.

The CRC covers only the fastmap data, not the super block.

>   	for (i = 0; i<  nblocks; i++) {
> +		/* TODO: you basically perform the scanning here - you should
> +		 * share the same code as we use in scan.c: use process_peb().
> +		 */

What exactly do you mean by that?
process_eb() will not help much because the fastmap data is written 
"raw" to the flash. (Without any interaction from the WL sub-system)

I'll release v6 now and address all other issues in v7.

Thanks,
//richard
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