Re: how do versioning filesystems take snapshot of opened files?

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> Consistent state means many different things. 

And, significantly, open/close has nothing to do with any of them 
(assuming we're talking about the system calls).  open/close does not 
identify a transaction; a program may open and close a file multiple times 
the course of making a "single" update.  Also, data and metadata updates 
remain buffered at the kernel level after a close.  And don't forget that 
a single update may span multiple files.

--
Bryan Henderson                     IBM Almaden Research Center
San Jose CA                         Filesystems

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