linux-kernel - Checksumming blocks? [was Re: the " 'official' point of view" expressed by kernelnewbies.org regarding reiser4 inclusion]

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Date:	Thu, 03 Aug 2006 19:25:19 -0400
From:	Russell Leighton <russ@...gant-software.com>
To:	Matthias Andree <matthias.andree@....de>
Cc:	David Masover <ninja@...phack.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, reiser@...esys.com, lkml@...productions.com,
	jeff@...zik.org, tytso@....edu, linux-kernel@...r.kernel.org
Subject: Checksumming blocks? [was Re: the " 'official' point of view" expressed
 by kernelnewbies.org regarding reiser4 inclusion]


If the software (filesystem like ZFS or database like Berkeley DB)  
finds a mismatch for a checksum on a block read, then what?

Is there a recovery mechanism, or do you just be happy you know there is 
a problem (and go to backup)?

Thx

Matthias Andree wrote:

>Berkeley DB can, since version 4.1 (IIRC), write checksums (newer
>versions document this as SHA1) on its database pages, to detect
>corruptions and writes that were supposed to be atomic but failed
>(because you cannot write 4K or 16K atomically on a disk drive).
>

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