Add SDT DTrace probes for VFS vnode operations in the vfs:vop provider namespace.  These are inserted dynamically into the VOP_..._AP() functions created from vnode_if.src.  Each VOP has entry and return probes, as arg0 the primary vnode, arg1 the vnode operation argument structure pointer, providing access to IN and OUT arguments, and for return probes, arg2 the return value.
Add SDT DTrace probes for VFS vnode operations in the vfs:vop
provider namespace.  These are inserted dynamically into the
VOP_..._AP() functions created from vnode_if.src.  Each VOP has
entry and return probes, as arg0 the primary vnode, arg1 the
vnode operation argument structure pointer, providing access to
IN and OUT arguments, and for return probes, arg2 the return
value.

MFC after:	1 month
Sponsored by:	Google, Inc.

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