Alan Cox wrote:
(Vax/VMS System Software Handbook)
(TOPS-20 User's Manual)
Also Files/11
Basic versioning goes back to at least ITS
Not sure how old doing file versioning and hiding it away with a tool to
go rescue the stuff you blew away by mistake is, but Novell Netware 3
certainly did a good job on that one
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
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