rem: return EPERM;
add: return FS_EPERM;
context: sys_close_query(bool kernel, int fd, const char *path, void *cookie){	int		err;	nspace	*ns;	fsystem	*fs;	vnode	*root;    err = get_file_fd(TRUE, fd, path, TRUE, &root);    if (err)        return err;    ns = root->ns;    fs = ns->fs;    if (ns->root != root)        return EINVAL;	if (fs->ops.close_query == NULL) {		dec_vnode(root, FALSE);		return EPERM;	}		err = (*fs->ops.close_query)(ns->data, cookie);	(*fs->ops.free_querycookie)(ns->data, NULL, cookie);	dec_vnode(root, FALSE);	return err;}