vn_fullpath_any
error = vn_fullpath_any(pwd->pwd_cdir, pwd->pwd_rdir, buf,
error = vn_fullpath_any(vp, get_pwd_vnode(pwd), buf, retbuf,
error = vn_fullpath_any(vp, rootvnode, buf, retbuf, &buflen);
static int vn_fullpath_any(struct vnode *vp, struct vnode *rdir, char *buf,