Message-Id: <200706210705.34702.philipp.marek@bmlv.gv.at>
Date:	Thu, 21 Jun 2007 07:05:34 +0200
From:	"Ph. Marek" <philipp.marek@...v.gv.at>
To:	linux-kernel@...r.kernel.org
Cc:	phillips@...op.com
Subject: TUX2 filesystem

Hello Daniel,
hello everbody else,


in Oct 2000 there's been some discussion "Tux2 - evil patents sighted" 
(http://www.ussg.iu.edu/hypermail/linux/kernel/0010.0/0343.html), and in Aug 
2002 (http://www.uwsg.iu.edu/hypermail/linux/kernel/0208.3/0332.html) Daniel 
wrote
> It's well down my list of priorities because of uncertainties due to
> the U.S. patent system. 
> Does anybody want to know if patent chill exists, and is it hurting
> open source? The answer is yes. 


With the recent Supreme Court decisions 
(http://www.groklaw.net/article.php?story=20070430121005424) and the fact 
that Daniel wrote that he did most of his work in *1989* (which is now 18 
years ago!) is there a chance for newer developments?


It seems to me that this kind of filesystem could solve a few problems that 
are currently attacked:
- Atomic snapshots. Make a new superblock, and mount this copy in another
  directory. As long as it's not overwritten, it stays consistent.
- Speed/Consistency for Flash media. There is a list of superblocks, and when
  the new block has been written the pointer from the old gets set - until the
  first block in the list gets re-written.

There may be some other nice things I didn't think about - but just having 
this filesystem for harddisks might be good, too.


Regards,

Phil
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