From: Andreas Dilger Subject: Re: What is fragment in ext3/4 ? Date: Thu, 2 Aug 2007 18:02:28 -0600 Message-ID: <20070803000228.GO6142@schatzie.adilger.int> References: <46B1A9F9.3050901@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-ext4@vger.kernel.org To: Coly Li Return-path: Received: from mail.clusterfs.com ([74.0.229.162]:43669 "EHLO mail.clusterfs.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756017AbXHCAC3 (ORCPT ); Thu, 2 Aug 2007 20:02:29 -0400 Content-Disposition: inline In-Reply-To: <46B1A9F9.3050901@gmail.com> Sender: linux-ext4-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org On Aug 02, 2007 17:55 +0800, Coly Li wrote: > These days, when I read the source code of mke2fs, I found an option -f > to set the fragment size. > > But I can not find any explaining for ext3/4 framgment from google, > excepting someone saying ext2/3 does not support this feature. > > Can anyone tell me what is the function or purpose of fragment of ext > file system ? This is an obsolete concept from BSD that was never used by ext[234]. Consider a "fragment" in this context to be the same as a "tail" for reiserfs. A very small file, or the end of a file that is less than a block. Cheers, Andreas -- Andreas Dilger Principal Software Engineer Cluster File Systems, Inc.