linux-kernel - Re: Versioning file system

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Date:	Sat, 16 Jun 2007 20:39:50 -0600
From:	"Jeffrey V. Merkey" <jmerkey@...fmountaingroup.com>
To:	"Jeffrey V. Merkey" <jmerkey@...fmountaingroup.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Jan Harkes <jaharkes@...cmu.edu>,
	Jack Stone <jack@...keye.stone.uk.eu.org>,
	alan <alan@...eserver.org>, hpa@...or.com,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	akpm@...ux-foundation.org, viro@...iv.linux.org.uk
Subject: Re: Versioning file system

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
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