nfslookup_dnlc
(void) nfslookup_dnlc(dvp, XATTR_DIR_NAME, &avp, cr);
error = nfslookup_dnlc(dvp, nm, vpp, cr);
error = nfslookup_dnlc(vp, XATTR_DIR_NAME, &avp, cr);
static int nfslookup_dnlc(vnode_t *, char *, vnode_t **, cred_t *);