From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Jeffrey V. Merkey" Subject: Re: Versioning file system Date: Sat, 16 Jun 2007 20:39:50 -0600 Message-ID: <46749EF6.6060306@wolfmountaingroup.com> References: <46731169.2090002@hawkeye.stone.uk.eu.org> <467314E2.9010306@zytor.com> <46739B2C.4080606@hawkeye.stone.uk.eu.org> <4673B15B.2080300@wolfmountaingroup.com> <4673B77E.1000803@wolfmountaingroup.com> <20070616164931.GF14788@delft.aura.cs.cmu.edu> <46744225.7000609@wolfmountaingroup.com> <20070616203926.GG14788@delft.aura.cs.cmu.edu> <20070616231758.7bbe9d01@the-village.bc.nu> <467499FF.5060306@wolfmountaingroup.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Cc: Alan Cox , Jan Harkes , Jack Stone , alan , hpa@zytor.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, akpm@linux-foundation.org, viro@zeniv.linux.org.uk To: "Jeffrey V. Merkey" Return-path: Received: from rwcrmhc13.comcast.net ([216.148.227.153]:56881 "EHLO rwcrmhc13.comcast.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752562AbXFQBYM (ORCPT ); Sat, 16 Jun 2007 21:24:12 -0400 In-Reply-To: <467499FF.5060306@wolfmountaingroup.com> Sender: linux-fsdevel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org Jeffrey V. Merkey wrote: > The trick in the NetWare 3 model was to segregate the directory > entries onto special reserved > 4K directory blocks (128 byte dir records). When it came time to purge > storage after the file system filled, an entire 4K block and all > chains was deleted during block allocation for new files. The dir > blocks were ordered by date -- oldest ones got purged > first. The model worked very well until compression was added to the > filesystem, then it started getting complex. > > I would be willing to help instrument the NetWare 3 model in this > proposal on ext3, since this is a basic versioning model and > would provide coverage for 99% of the folks needing this capability. I > am available for questions. > > Jeff > I resigned as Chief Scientist of Solera Networks May 8 this year -- mostly because I was not allowed to have any freedom, including working on free Linux projects. This went on for almost 4 years (since 2003). Now that I am independent again, I can work on stuff like this again. I started a new company with John Noorda (Ray Noorda's oldest son) who runs Canopy now. That's my current status. I am an owner and entrepeneur again. So I have a lot of free time and will from now on. Jeff