From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757825AbZEXRjl (ORCPT ); Sun, 24 May 2009 13:39:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754440AbZEXRjd (ORCPT ); Sun, 24 May 2009 13:39:33 -0400 Received: from faui03.informatik.uni-erlangen.de ([131.188.30.103]:48065 "EHLO faui03.informatik.uni-erlangen.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753655AbZEXRjd (ORCPT ); Sun, 24 May 2009 13:39:33 -0400 Date: Sun, 24 May 2009 19:39:33 +0200 From: Thomas Glanzmann To: Arjan van de Ven Cc: tytso@thunk.org, LKML , linux-ext4@vger.kernel.org Subject: Re: zero out blocks of freed user data for operation a virtual machine environment Message-ID: <20090524173933.GD24753@cip.informatik.uni-erlangen.de> Mail-Followup-To: Thomas Glanzmann , Arjan van de Ven , tytso@thunk.org, LKML , linux-ext4@vger.kernel.org References: <20090524170045.GC24753@cip.informatik.uni-erlangen.de> <20090524101551.57b706e9@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090524101551.57b706e9@infradead.org> User-Agent: Mutt/1.5.15 (2007-05-02) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, > > tunable feature that zeroes our free data > wouldn't it be better if the VM's would just support the TRIM command? the resources available to me indicate that the TRIM command is a not yet standarized command targeted at SSD disks to indicate free disk space. Does ext3/4 trigger a block device layer call that could result in a TRIM command? Thomas