- Turn all explicit giant acquires into conditional VFS_LOCK_GIANTs.

   Only ops which used namei still remained.
 - Implement a scheme for reducing the overhead of tracking which vops
   require giant by constantly reducing the number of recursive giant
   acquires to one, leaving us with only one vfslocked variable.
 - Remove all NFSD lock acquisition and release from the individual nfs
   ops.  Careful examination has shown that they are not required.  This
   greatly simplifies the code.

Sponsored by:	Isilon Systems, Inc.
Discussed with:	rwatson
Tested by:	kkenn
Approved by:	re

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