rem: return (*key) % range;
add: return (uint64)*key % range;
context: rootfs_vnode_hash_func(void *_v, const void *_key, uint32 range){	struct rootfs_vnode *vnode = _v;	const vnode_id *key = _key;	if (vnode != NULL)		return vnode->id % range;	return (*key) % range;}