linux-kernel - Re: [PATCH v4] UBIFS: compute KSA size and store in superblock

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Message-ID: <1339060240.6875.90.camel@sauron.fi.intel.com>
Date:	Thu, 07 Jun 2012 12:10:40 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Joel Reardon <joel@...mbassador.com>
Cc:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] UBIFS: compute KSA size and store in superblock

On Wed, 2012-06-06 at 20:52 +0200, Joel Reardon wrote:
> This patch makes the super block reserve space for the KSA. It computes the
> number of KSA LEBs and adds the ksa_lebs to on-medium superblock. The value is
> read off the media. The decision to use a KSA is controlled by use_ubifsec
> switch, added as a flag to the superblock, ubifs_info, and is controlled as a mount
> option. Validate superblock also checks these values.
> 
> This is tested by creating a drive and checking the mount debug output. The
> number of LEBS assigned during create_default_filesystem was changed to ensure
> that remounting does infact read the old value. When the use_ubifsec option
> was not enabled, no LEBs were assigned. Integck was run and the drive was
> filled to capacity. The LEBs in the KSA were not used when filled. Invalid
> value for ksa_lebs were used and then rejected by validate superblock.
> 
> Signed-off-by: Joel Reardon <reardonj@....ethz.ch>

Thank Joel, but this patch has several major issues with the KSA size
calculation, I believe. I've pushed it anyway to the 'joel' branch, then
on top of it I've added several clean-ups and little improvements, and
then on top of it I've added a patch which adds several TODO comments
for you. Please, take a look. I've also sent the patches to you
separately.

-- 
Best Regards,
Artem Bityutskiy

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