[OpenAFS] afs semantics

[Adam Megacz]

The people who write darcs (an incredibly powerful/flexible version
control system) are looking into making sure that it works properly on
AFS, and were looking for an authoritative, official statement of
exactly how AFS file semantics differ from UNIX semantics:

  http://bugs.darcs.net/issue117

Specifically, can anybody comment on these points?

  1. If two processes on different clients both attempt to
     open(O_CREAT|O_EXCL), does AFS guarantee that no more than one of
     them will succeed?

  2. If two processes both attempt to rename() the same [source] file,
     does AFS guarantee that exactly one of them succeeds?

  3. If client "A" makes two inode-level changes (creat, remove,
     rename, etc), is it ever possible for client "B" to see the
     second change before the first one?

Thanks,

  - a

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