From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 20 Dec 2001 17:25:28 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 20 Dec 2001 17:25:18 -0500 Received: from 216-175-173-2.client.dsl.net ([216.175.173.2]:3837 "HELO mail.fdfl") by vger.kernel.org with SMTP id ; Thu, 20 Dec 2001 17:25:09 -0500 Message-ID: <3C226543.2010801@frontierd-us.com> Date: Thu, 20 Dec 2001 17:25:07 -0500 From: Jelle Foks User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.5) Gecko/20011014 X-Accept-Language: en-us MIME-Version: 1.0 To: Denis RICHARD Cc: linux-kernel@vger.kernel.org Subject: Re: New version of e2compr for 2.4.16 kernel. In-Reply-To: <3C2098D7.4228B2A5@sxb.bsf.alcatel.fr> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Denis RICHARD wrote: >Hi, > > We have developped a new version of the e2compr package for the 2.4.16 kernel. > Nice. Since ext3fs is based on ext2fs, will that work with ext3fs too? cya, Jelle. > >It is based on the e2compr-0.4.39 patch provided by Peter Moulder >for 2.2.18 kernel (http://cvs.bofh.asn.au/e2compr/). > It is full compatible with previous version. > > We have introduced the structure of "cluster of pages", as there was the structure >of "cluster of blocks" in preceding version. The compression unit is the cluster of >pages. > > The implementation is similar with the 2.2 version. If the page needed is not present >in memory, the cluster of pages including this one is decompressed. > But in the 2.4 kernel the pages and the blocks have common area for the data. >If a block is read from the device, the corresponding page is also modified. >Then to decompress a cluster we should not read the blocks in the already used pages (decompressed) >of the cluster. These pages can have been modified or can be used by another process (mapping). >If a page is UPTODATE, a new one is allocated to decompress the cluster, and is freed after that. > > It has only been tested on i386 architecture, so be careful if you want to try it >on other architecture, and especially if pages are large and can belong to two different >clusters. > > For more informations, see the README files in Documentation/filesystems directory. > > If someone is interested by the patch, we will mail it. > > Feel free to contat us if you have some questions. > > Have fun. > > Pierre PEIFFER, Denis RICHARD . > >PS : We have also adjusted the e2fsprogs patch for the last version (1.25). > >-- >-----------------------------\--------------------------\ >Denis RICHARD \ ALCATEL Business Systems \ >mailto:dri@sxb.bsf.alcatel.fr / Tel: +33(0)3 90 67 69 36 / >-----------------------------/--------------------------/ > > > >- >To unsubscribe from this list: send the line "unsubscribe linux-kernel" in >the body of a message to majordomo@vger.kernel.org >More majordomo info at http://vger.kernel.org/majordomo-info.html >Please read the FAQ at http://www.tux.org/lkml/ >