[OpenAFS] another approach for detecting byte-range-lock safeness

[Adam Megacz]

Is Linux the *only* currently-deployed (ie <=1.4.x) AFS client that
implements client-local byte range locking?

If so, perhaps I can check what OS is running, use some hardwired
syscall value if OS==Linux, and use the fork()-and-fcntl(F_SETLK) to
look for (local) enforcement of byte-range locks if OS!=Linux.

Any obvious flaws in this?  Has the AFS syscall() value been the same
on Linux throughout history?

If any other platforms acquire byte-range locking abilities in the
future, I would cross my fingers and hope that they either get "safe"
byte-range locks or else simultaneously get some API for asking if the
byte-range locks are fake.

  - a

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