nfs3lookup_dnlc
static int nfs3lookup_dnlc(vnode_t *, char *, vnode_t **, cred_t *);
(void) nfs3lookup_dnlc(dvp, XATTR_DIR_NAME, &avp, cr);
error = nfs3lookup_dnlc(dvp, nm, vpp, cr);
error = nfs3lookup_dnlc(vp, XATTR_DIR_NAME, &avp, cr);