rem: vnode_compare(void *_v, const void *_key)
add: vnode_compare(void *_vnode, const void *_key)
context: vnode_compare(void *_v, const void *_key){	struct vnode *v = _v;	const struct vnode_hash_key *key = _key;	if (v->mount_id == key->mount_id && v->id == key->vnode_id)		return 0;	return -1;}