FILEDESC_LOCK() implementation

[Poul-Henning Kamp]

In message <20060612080504.W26634 at fledge.watson.org>, Robert Watson writes:

>At least in the VFS and socket code, you want a notion of acquiring both and 
>dropping one, or upgrading/downgrading.  The logic tends to go something like 
>this:

That's different from what FILEDESC needs.  FILEDESC has two different
classes of operations: cheap/non-sleeping and expensive/sleeping

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