I found this research paper while looking for versioning filesystems (yeah, I’m obsessed with versioning).
What I found striking about this paper was the different way it approaches versioning. Most filesystems that I have covered take snapshots of files and in filesystems like ext3cow, one can access the previous version of the file using a certain syntax. PersiFS continuously versions files at every update. Considering that PersiFS operates over a network, the server should be able to dig out data from the fs as quick as it can on other orthodox filesystems. Persifs allows users to look at directory states as shown:
#current version:
/fs/now
#version of the filesystem on the 30th of February at 12:05 pm ( 
) :
/fs/2007-2-30-12-05-00
Anyway, I have to cover the portion on optimizing read/write methods so I’ll put up a post on that when I get around to reading that. Till then, goodbye
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