linux-ext4 - Re: [dm-devel] Some thoughts about providing data block checksumming for ext4

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Message-ID: <545A9885.8070901@gmail.com>
Date:	Wed, 05 Nov 2014 22:37:09 +0100
From:	Milan Broz <gmazyland@...il.com>
To:	Mikulas Patocka <mpatocka@...hat.com>,
	Theodore Ts'o <tytso@....edu>
CC:	linux-ext4@...r.kernel.org, dm-devel@...hat.com
Subject: Re: [dm-devel] Some thoughts about providing data block checksumming
 for ext4

On 11/05/2014 01:27 AM, Mikulas Patocka wrote:

> So you really need cryptographic hashes instead of checksums to avoid the 
> collisions.

I am not sure if it was mentioned but also see how integrity is implemented in
FreeBSD GELI system by playing with sector sizes
 
http://svnweb.freebsd.org/base/head/sys/geom/eli/g_eli_integrity.c?view=co

Also, for encrypted devices (either on file level or block level) I think 
there are still requests for implementing real crypto authenticated modes (like GCM)
which obviously need similar space for auth tag. (I think ZFS uses it this way.) 

Milan

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