From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753226Ab0E3Mcz (ORCPT ); Sun, 30 May 2010 08:32:55 -0400 Received: from THUNK.ORG ([69.25.196.29]:34254 "EHLO thunker.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752540Ab0E3Mcy (ORCPT ); Sun, 30 May 2010 08:32:54 -0400 Date: Sun, 30 May 2010 08:32:48 -0400 From: tytso@mit.edu To: Peter Hallberg Cc: linux-kernel@vger.kernel.org Subject: Re: What happened to mount option "noextents" Message-ID: <20100530123248.GO26177@thunk.org> Mail-Followup-To: tytso@mit.edu, Peter Hallberg , linux-kernel@vger.kernel.org References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.20 (2009-06-14) X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: tytso@thunk.org X-SA-Exim-Scanned: No (on thunker.thunk.org); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, May 30, 2010 at 02:07:06PM +0200, Peter Hallberg wrote: > > On Ubuntu 9.04 it is possible to mount an ext4 file system with the > mount option "noextents" but on Ubuntu 10.04 it gives the error > message: Ext4: Unrecognized mount option "noextents" in dmesg. Both the "extents" and "noexents" mount options were removed in newer kernels. If you want to turn on extents, the right answer is to use the "tune2fs -O extents" command. The "noextents" mount option didn't really make much sense, since it basically was either no-op (if extents were not enabled), and was mostly useless (if extents were enabled in the file system), since it basically meant, "create new files without using extents". But since the old files were still extents-based, it didn't make the file system any more compatible with ext3 file systems. Basically, since we couldn't think of a good use case where the mount options made sense, and ext4 has way too many mount options already, we decided to remove them. - Ted