Re: Versioning file system

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From: Jack Stone
Date: Saturday, June 16, 2007 - 1:25 am

Chris Snook wrote:

But to work without breaking userspace it would need to be a character
that would pass through any path checking routines, ie be a legal path
character.


My personal implementation idea was to store lots of files for the form
file:revision_number (I'll keep using that until somebody sugests
something better) on the file system itself, with a hard link form the
latest version to file (this is probably not a major imporvement and
having the hard link coudl make it hard to implement deltas). This could
mean no changes to the file system itself (except maybe a flag to say
its versioned). The kernel would then do the translation to find the
correct file, and would only show the latest version to userapps not
requesting a specific version.


The whole interface would be designed to give existing behavior as
default for two reasons: users are used to opening a file and getting
the latest version and not to break userspace. I personally wouldn't
touch this either if it broke userspace. The only userspace change would
be the addition of tools to manage the revisions etc. Userspace could
later upgrade to take advantage of the new functionality but I cannot
see the worth in breaking it.

For an example of a working implementation see:
http://www.o3one.org/filesystem.html

Jack
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Messages in current thread:
Versioning file system, Jack Stone, (Fri Jun 15, 3:23 pm)
Re: Versioning file system, H. Peter Anvin, (Fri Jun 15, 3:38 pm)
Re: Versioning file system, alan, (Fri Jun 15, 3:51 pm)
Re: Versioning file system, Chris Snook, (Fri Jun 15, 3:52 pm)
Re: Versioning file system, Kok, Auke, (Fri Jun 15, 3:57 pm)
Re: Versioning file system, H. Peter Anvin, (Fri Jun 15, 3:59 pm)
Re: Versioning file system, alan, (Fri Jun 15, 4:01 pm)
Re: Versioning file system, alan, (Fri Jun 15, 4:06 pm)
Re: Versioning file system, Jack Stone, (Sat Jun 16, 1:11 am)
Re: Versioning file system, Jack Stone, (Sat Jun 16, 1:25 am)
Re: Versioning file system, Jeffrey V. Merkey, (Sat Jun 16, 2:46 am)
Re: Versioning file system, Jeffrey V. Merkey, (Sat Jun 16, 3:12 am)
Re: Versioning file system, Johannes Weiner, (Sat Jun 16, 4:20 am)
Re: Versioning file system, Graham Murray, (Sat Jun 16, 4:42 am)
Re: Versioning file system, Mark Williamson, (Sat Jun 16, 6:15 am)
Re: Versioning file system, Jörn, (Sat Jun 16, 7:53 am)
Re: Versioning file system, Jan Harkes, (Sat Jun 16, 9:49 am)
Re: Versioning file system, Jack Stone, (Sat Jun 16, 12:38 pm)
Re: Versioning file system, Jeffrey V. Merkey, (Sat Jun 16, 12:57 pm)
Re: Versioning file system, Jeffrey V. Merkey, (Sat Jun 16, 1:03 pm)
Re: Versioning file system, Alan Cox, (Sat Jun 16, 1:08 pm)
Re: Versioning file system, Jan Harkes, (Sat Jun 16, 1:39 pm)
Re: Versioning file system, Jack Stone, (Sat Jun 16, 1:43 pm)
Re: Versioning file system, Dale Amon, (Sat Jun 16, 2:06 pm)
Re: Versioning file system, Jeffrey V. Merkey, (Sat Jun 16, 2:25 pm)
Re: Versioning file system, Alan Cox, (Sat Jun 16, 3:17 pm)
Re: Versioning file system, Jeffrey V. Merkey, (Sat Jun 16, 7:18 pm)
Re: Versioning file system, Jeffrey V. Merkey, (Sat Jun 16, 7:39 pm)
Re: Versioning file system, Dale Amon, (Sun Jun 17, 3:11 pm)
Re: Versioning file system, Andreas Dilger, (Mon Jun 18, 2:45 am)
Re: Versioning file system, Jack Stone, (Mon Jun 18, 2:54 am)
Re: Versioning file system, Jörn, (Mon Jun 18, 3:13 am)
Re: Versioning file system, Theodore Tso, (Mon Jun 18, 7:01 am)
Re: Versioning file system, Chris Mason, (Mon Jun 18, 8:32 am)
Re: Versioning file system, alan, (Mon Jun 18, 9:16 am)
Re: Versioning file system, Theodore Tso, (Mon Jun 18, 10:29 am)
Re: Versioning file system, Jeremy Allison, (Mon Jun 18, 10:33 am)
Re: Versioning file system, H. Peter Anvin, (Mon Jun 18, 10:46 am)
Re: Versioning file system, Theodore Tso, (Mon Jun 18, 1:30 pm)
Re: Versioning file system, J. Bruce Fields, (Mon Jun 18, 1:50 pm)
Re: Versioning file system, Bron Gondwana, (Mon Jun 18, 4:18 pm)
Re: Versioning file system, Chris Snook, (Tue Jun 19, 11:03 am)
Re: Versioning file system, Jack Stone, (Tue Jun 19, 12:06 pm)
Re: Versioning file system, H. Peter Anvin, (Tue Jun 19, 12:08 pm)
Re: Versioning file system, Jack Stone, (Tue Jun 19, 12:12 pm)
Re: Versioning file system, H. Peter Anvin, (Tue Jun 19, 12:15 pm)
Re: Versioning file system, Jack Stone, (Tue Jun 19, 12:22 pm)
Re: Versioning file system, Chris Snook, (Tue Jun 19, 1:03 pm)
Re: Versioning file system, Jack Stone, (Tue Jun 19, 1:08 pm)
Re: Versioning file system, Chris Snook, (Tue Jun 19, 1:10 pm)
Re: Versioning file system, Jack Stone, (Tue Jun 19, 1:14 pm)
Re: Versioning file system, Chris Snook, (Tue Jun 19, 1:15 pm)
Re: Versioning file system, Jack Stone, (Tue Jun 19, 1:27 pm)
Re: Versioning file system, Chris Snook, (Tue Jun 19, 1:31 pm)
Re: Versioning file system, John Stoffel, (Tue Jun 19, 1:34 pm)
Re: Versioning file system, Jack Stone, (Tue Jun 19, 1:38 pm)
Re: Versioning file system, Matthew Wilcox, (Tue Jun 19, 1:38 pm)
Re: Versioning file system, Lennart Sorensen, (Tue Jun 19, 1:43 pm)
Re: Versioning file system, John Stoffel, (Tue Jun 19, 2:02 pm)
Re: Versioning file system, Alan Cox, (Tue Jun 19, 2:50 pm)
Re: Versioning file system, david, (Tue Jun 19, 3:07 pm)
Re: Versioning file system, H. Peter Anvin, (Tue Jun 19, 3:07 pm)
Re: Versioning file system, H. Peter Anvin, (Tue Jun 19, 3:13 pm)
Re: Versioning file system, Lennart Sorensen, (Tue Jun 19, 3:21 pm)
Re: Versioning file system, Jan Harkes, (Tue Jun 19, 4:07 pm)
Re: Versioning file system, H. Peter Anvin, (Tue Jun 19, 4:12 pm)
Re: Versioning file system, Bryan Henderson, (Tue Jun 19, 4:35 pm)
Re: Versioning file system, Trond Myklebust, (Tue Jun 19, 5:27 pm)
Re: Versioning file system, H. Peter Anvin, (Tue Jun 19, 10:00 pm)
Re: Versioning file system, Ph. Marek, (Wed Jun 20, 1:05 am)
Re: Versioning file system, Bernd Petrovitsch, (Wed Jun 20, 1:34 am)
Re: Versioning file system, Bryan Henderson, (Wed Jun 20, 10:04 am)
Re: Versioning file system, H. Peter Anvin, (Wed Jun 20, 10:10 am)
Re: Versioning file system, Chris Snook, (Wed Jun 20, 10:33 am)
Re: Versioning file system, Erik Mouw, (Wed Jul 4, 10:32 am)
Re: Versioning file system, Theodore Tso, (Wed Jul 4, 1:47 pm)
Re: Versioning file system, John Stoffel, (Thu Jul 5, 6:57 am)
Re: Versioning file system, Chris Mason, (Thu Jul 5, 7:23 am)
Re: Versioning file system, Erik Mouw, (Thu Jul 5, 10:55 am)
Re: Versioning file system, Erik Mouw, (Thu Jul 5, 10:57 am)
Re: Versioning file system, Sorin Faibish, (Sat Sep 29, 10:44 am)