linux-ext4 - Re: [RFC] ext4 metadata checksumming design

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Message-ID: <20110817170916.GQ20655@tux1.beaverton.ibm.com>
Date:	Wed, 17 Aug 2011 10:09:16 -0700
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	"Theodore Ts'o" <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Sunil Mushran <sunil.mushran@...cle.com>,
	Joel Becker <jlbec@...lplan.org>,
	Mingming Cao <cmm@...ibm.com>,
	Amir Goldstein <amir73il@...il.com>, Coly Li <colyli@...il.com>
Subject: Re: [RFC] ext4 metadata checksumming design

On Wed, Aug 17, 2011 at 03:57:19PM +0200, Andi Kleen wrote:
> On Tue, Aug 16, 2011 at 08:25:19PM -0700, Darrick J. Wong wrote:
> > Hi all,
> > 
> > I've created a page on the ext4 wiki outlining the patchset that I'm working on
> > to add metadata checksumming to ext4.  The page can be found at this address:
> > https://ext4.wiki.kernel.org/index.php/Ext4_Metadata_Checksums
> 
> Can you summarize the differences to my earlier patchkit?

My new patchset intends to expand on your earlier inode/superblock patches by
adding checksums to nearly all metadata objects (directory blocks, htree,
extent tree, block/inode bitmaps, extended attributes).  It also adds code to
e2fsprogs to verify the checksums, and make the necessary adjustments to the
on-disk format to add space for checksums.

--D
> 
> -Andi
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