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

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Date:	Wed, 09 Aug 2006 02:40:54 -0600
From:	Hans Reiser <reiser@...esys.com>
To:	Edward Shishkin <edward@...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

Edward Shishkin wrote:

> Hans Reiser wrote:
>
>> Edward Shishkin wrote:
>>
>>
>>>>
>>>> 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.
>>
>>
>>
>> Would you prefer to do it as a node layout plugin instead, so as to get
>> the metadata?
>>
>
> Yes, it looks like a business of node plugin, but AFAIK, you
> objected against such checks:

Did I really?  Well, I think that allowing users to choose whether to
checksum or not is a reasonable thing to allow them.  I personally would
skip the checksum on my computer, but others....

It could be a useful mkfs option....

> currently only bitmap nodes have
> a protection (checksum); supporting ecc-signatures is more
> space/cpu expensive.
>
> Edward.
>
>

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