fuse_internal_get_cached_vnode
err = fuse_internal_get_cached_vnode( mp, fnieo.parent,
err = fuse_internal_get_cached_vnode(mp, fniio.ino,
fuse_internal_get_cached_vnode(struct mount*, ino_t, int, struct vnode**);
error = fuse_internal_get_cached_vnode(mp, ino, flags, vpp);