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From: "Chao-Kuo Lin" <chaokuo@iname.com>
To: 9fans@cse.psu.edu
Date: Thu,  4 Aug 2005 16:58:22 -0500
Message-Id: <20050804215822.46F3A1F50B1@ws1-2.us4.outblaze.com>
Subject: [9fans] Software release: divergefs
Topicbox-Message-UUID: 72f63b32-ead0-11e9-9d60-3106f5b1d025

Inspired by various discussions about the utility of a
layer/union/overlay/stitch file system, I wrote one as a project
for the Operating System Practicum class here at CMU.  It supports
the simple case of making a few mutations "above" a read-only base
file system tree, and also allows storing files in various layers
above the base (so, for example, you can store object files in
local RAM instead of writing them back to a distant file server).

It's done enough that you can use it to build kernels and the like,
but the user interface is very rough--probably just enough so that
people can complain about it and help figure out what the right
interface would be.

It's available at
http://www.cs.cmu.edu/~412-s04/chaokul/divergefs.tar.gz

with Wiki entry at
http://www.cs.bell-labs.com/wiki/plan9/divergefs/

Bug reports, comments, and suggestions welcome.

Chao-Kuo Lin

--=20
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