From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932234AbWGGRlJ (ORCPT ); Fri, 7 Jul 2006 13:41:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932235AbWGGRlI (ORCPT ); Fri, 7 Jul 2006 13:41:08 -0400 Received: from khc.piap.pl ([195.187.100.11]:11156 "EHLO khc.piap.pl") by vger.kernel.org with ESMTP id S932234AbWGGRlH (ORCPT ); Fri, 7 Jul 2006 13:41:07 -0400 To: Valdis.Kletnieks@vt.edu Cc: ric@emc.com, Tomasz Torcz , Thomas Glanzmann , "Theodore Ts'o" , LKML Subject: Re: ext4 features References: <20060701163301.GB24570@cip.informatik.uni-erlangen.de> <20060701170729.GB8763@irc.pl> <20060701174716.GC24570@cip.informatik.uni-erlangen.de> <20060701181702.GC8763@irc.pl> <44AD286F.3030507@emc.com> <44AD4807.6090704@emc.com> <200607062052.k66KqMDH027923@turing-police.cc.vt.edu> From: Krzysztof Halasa Date: Fri, 07 Jul 2006 19:41:05 +0200 In-Reply-To: <200607062052.k66KqMDH027923@turing-police.cc.vt.edu> (Valdis Kletnieks's message of "Thu, 06 Jul 2006 16:52:22 -0400") Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Valdis.Kletnieks@vt.edu writes: > Backup programs want it stored with the file. Not necessarily - backup may want to store the hashes in some central place as well. I'm using such solution and it has only positives. > If the filesystem stored a "guaranteed trustable current hash", Tripwire > *could* use it to compare against its database rather than having to re-read > the file and recompute it. Unfortunately, a useful trustable hash is > basically incompatible with any sort of incremental updating (except for > the special case of appending to the file). Block hashes + master hash could allow something like that. Not sure if we want it in the fs, though. -- Krzysztof Halasa