linux-ext4 - Re: Some thoughts about providing data block checksumming for ext4

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Message-ID: <20141126234706.GN10043@birch.djwong.org>
Date:	Wed, 26 Nov 2014 15:47:06 -0800
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org, dm-devel@...hat.com
Subject: Re: Some thoughts about providing data block checksumming for ext4

Sigh...

Well, I wrote up a preliminary version of dm-checksum and then
realized that I've pretty much just built a crappier version of
dm-dedupe, but without the dedupe part.  Given that it stores
checksums in a btree which claims to be robust through failures and
gives us automatic deduplication, I wonder if it we could achieve our
aims by modifying dm-dedupe to verify the checksums on the read path?

I guess it would be interesting to see how bad the performance hit is
with the online dedupe part enabled or disabled.  dm-dedupe v2 went
out on the mailing list last August, which I missed. :(

Unless... there's a specific reason nobody mentioned dm-dedupe here?

--D
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