nfs locking for cluster filesystems

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If a filesystem defines a ->lock() method, that method is called when an
application uses fcntl(), but it isn't called from the code path used by
the lock managers (lockd (for nfsv2/v3) and nfsd itself (for v4)).  The
following patches remedy that.  (This hasn't been a problem until
recently because the filesystems that define ->lock (nfs, cifs, etc.)
aren't filesystems that nfsd exports.  The arrival of cluster
filesystems changes that.)

We'd like an ack from Trond and/or Christoph before this goes into
mainline, but it seems ready at least for testing in -mm.

The first four to six patches are actually just locks.c cleanup.

--b.

(Apologies for any duplicate mail; git-send-email doesn't always seem to
agree with me....)
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