[pnfs] [PATCH] support nested cb_layoturecall callbacks

[Benny Halevy]

0001-support-nested-cb_layoturecall-callbacks.patch

it is possible that layoutrecall will be invoked while the state lock
is being held by the caller (e.g. on the close path). And there's no way
currently to avoid taking the state lock in the layoutrecall path.
This patch provides for detecting that the call is nested while
the state lock is taken and doing the callbacks synchronously under the
lock.

For some reason it looks like the callback path is not up
so tests doing layoutrecall fail, apparently since nfsd41_probe_callback
is never called.

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