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