nfsrpc_getattr
error = nfsrpc_getattr(newvp, cnp->cn_cred,
ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva,
error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL);
int nfsrpc_getattr(vnode_t, struct kauth_cred *, NFSPROC_T *,