From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?B?SsO2cmctVm9sa2VyIFBlZXR6?= Subject: ext4 lazytime: ctime of some files changed Date: Wed, 13 May 2015 11:35:31 +0200 Message-ID: <55531AE3.7030704@web.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Cc: Theodore Ts'o To: linux-fsdevel@vger.kernel.org Return-path: Received: from plane.gmane.org ([80.91.229.3]:59387 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932707AbbEMKAJ (ORCPT ); Wed, 13 May 2015 06:00:09 -0400 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1YsTSM-0006ob-MY for linux-fsdevel@vger.kernel.org; Wed, 13 May 2015 12:00:02 +0200 Received: from p5b0a06df.dip0.t-ipconnect.de ([91.10.6.223]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 13 May 2015 12:00:02 +0200 Received: from jvpeetz by p5b0a06df.dip0.t-ipconnect.de with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 13 May 2015 12:00:02 +0200 Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Dear Ted, on my laptop with ext4 fs (on SSD) I started to try the lazytime mount option using a self compiled kernel 4.0.2 on a debian system with mount version 2.26.2. Before that, I've used the noatime mount option. After restarting the system with an adapted /etc/fstab file and the kernel parameter "rootflags=lazytime", the relatime mount option was also set. I changed that by commanding "mount -o remount,strictatime /", etc. By accident, I noticed that some files had a modified ctime and mtime although they were not changed or modified. Has anybody else experienced that? Do I miss a patch? Mount options in fstab: nobarrier,lazytime,errors=remount-ro The filesystems are ext4 on a primary partition of the SSD with default mount option journal_data_writeback. I created them in Feb 2011. By the way, the command "mount -o remount,lazytime /" does not do the switch to lazytime. And thanks for your tireless work on Linux. -- Regards, jvp.