linux-kernel - Re: the " 'official' point of view" expressed by kernelnewbies.org regarding reiser4 inclusion

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Date:	Fri, 04 Aug 2006 21:04:27 +0400
From:	Edward Shishkin <edward@...esys.com>
To:	Hans Reiser <reiser@...esys.com>
CC:	Matthias Andree <matthias.andree@....de>, ric@....com,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Adrian Ulrich <reiser4@...nkenlights.ch>,
	"Horst H. von Brand" <vonbrand@....utfsm.cl>,
	bernd-schubert@....de, reiserfs-list@...esys.com,
	jbglaw@...-owl.de, clay.barnes@...il.com, rudy@...ons.demon.nl,
	ipso@...ppymail.ca, lkml@...productions.com, jeff@...zik.org,
	tytso@....edu, linux-kernel@...r.kernel.org
Subject: Re: the " 'official' point of view" expressed by kernelnewbies.org
 regarding reiser4 inclusion

Hans Reiser wrote:
> Edward Shishkin wrote:
> 
> 
>>Matthias Andree wrote:
>>
>>
>>>On Tue, 01 Aug 2006, Hans Reiser wrote:
>>>
>>>
>>>
>>>>You will want to try our compression plugin, it has an ecc for every
>>>>64k....
>>>
>>>
>>>
>>>What kind of forward error correction would that be,
>>
>>
>>
>>Actually we use checksums, not ECC. If checksum is wrong, then run
>>fsck - it will remove the whole disk cluster, that represent 64K of
>>data.
> 
> 
> How about we switch to ecc, which would help with bit rot not sector loss?

Interesting aspect.

Yes, we can implement ECC as a special crypto transform that inflates
data. As I mentioned earlier, it is possible via translation of key
offsets with scale factor > 1.

Of course, it is better then nothing, but anyway meta-data remains
ecc-unprotected, and, hence, robustness is not increased..

Edward.

> 
>>
>> and how much and
>>
>>
>>>what failure patterns can it correct? URL suffices.
>>>
>>
>>Checksum is checked before unsafe decompression (when trying to
>>decompress incorrect data can lead to fatal things). It can be
>>broken because of many reasons. The main one is tree corruption
>>(for example, when disk cluster became incomplete - ECC can not
>>help here). Perhaps such checksumming is also useful for other
>>things, I didnt classify the patterns..
>>
>>Edward.
>>
>>
> 
> 
> 
> 

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