From: Prashant Shah Subject: Re: freeze_bdev hangs Date: Mon, 8 Oct 2012 13:13:34 +0530 Message-ID: References: <506F19E6.8030005@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Cc: linux-ext4@vger.kernel.org To: Eric Sandeen Return-path: Received: from mail-ee0-f46.google.com ([74.125.83.46]:34547 "EHLO mail-ee0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751290Ab2JHHn4 (ORCPT ); Mon, 8 Oct 2012 03:43:56 -0400 Received: by mail-ee0-f46.google.com with SMTP id b15so2534395eek.19 for ; Mon, 08 Oct 2012 00:43:55 -0700 (PDT) In-Reply-To: <506F19E6.8030005@redhat.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: Hi, On Fri, Oct 5, 2012 at 11:03 PM, Eric Sandeen wrote: > I haven't looked at your custom code, but freeze has changed a bit lately, > and "hangs" is a very vague description > > -Eric I am monitoring the file system (ext3) for block writes and on linux-2.6.18 (centos - 5.8 64bit) there are lots of writes request per second with inode number set to 0 even when the file system is idle and without any work loads. Didnt see this happen on linux-3.x. filter: sector=242983 inode=0 filter: sector=242991 inode=0 filter: sector=242999 inode=0 filter: sector=243007 inode=0 filter: sector=243015 inode=0 filter: sector=243023 inode=0 filter: sector=243031 inode=0 filter: sector=243039 inode=0 What are these request with inode number as 0 ? All the special inode numbers start from 1. http://lxr.linux.no/#linux+v2.6.32/include/linux/ext3_fs.h#L56 Regards.