puffs_cookie2vnode
if (puffs_cookie2vnode(pmp, cookie, &vp) == 0) {
rv = puffs_cookie2vnode(pmp, pf->pf_cookie, &vp);
int puffs_cookie2vnode(struct puffs_mount *, puffs_cookie_t,
rv = puffs_cookie2vnode(pmp, pmp->pmp_root_cookie, vpp);