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According to https://xfs.org/index.php/Shrinking_Support :
"Currently XFS Filesystems can't be shrunk."
You need backup the data and recreate the file system to shrink it.
But if you have a big xfs filesystem with not too much space used, For example, a 2T xfs volume with 100G data.
And you can take some risk to lose data. Here is a way to shrink it without using new space.
The idea is:
1.temporary reduce the logic volume size, you can still read from xfs filesystem even after the partition or volume is shrunk if the real data is not wrote at the shrunk part
2.create a new volume
3.copy data

	<!--/*
	* http://learnbasic.id1945.com/
	* http://lholhox.wordpress.com/
	* Use is subject to license terms.
	*/
	/**
	*
	* @Raden Mas Lholhox
	* -->

	//Refactor of absolute path check from Express
	module.exports = function (path){
	var pathIsAbsolute = false,
	firstCharIsSlash = path[0] === '/',
	containsWinChars = path[1] === ':' && path[2] === '\\';

	if(firstCharIsSlash \|\| containsWinChars) {
	pathIsAbsolute = true;
	}

	/jshint strict:false /
	'use strict';

	// Create a new angular module.
	var MessageCenterModule = angular.module('MessageCenterModule', []);

	// Define a service to inject.
	MessageCenterModule
	.provider("$messageCenterService", function() {
	var _this = this;

	var express = require('express');
	var app = express();

	//Normal way - won't work if function is extracted to a module
	app.use(function(req, res, next) {
	'use strict';

	app.locals.greeting = 'hello';
	next();

	//Assuming you're already in an angular controller...
	$scope.user = {};
	//$scope.user will get filled with "email" and "password" keys
	var enteredUsername = angular.copy($scope.username);

	$scope.register = function() {
	var ref = new Firebase("https://<YOUR-FIREBASE-APP>.firebaseio.com");
	var user = angular.copy($scope.user);

	ref.createUser({

	<!DOCTYPE html>
	<html>
	<head>
	<style>
	.editor { font-family: 'Roboto Mono', monospace; font-size: 12px; outline: none; overflow-y: auto; padding-left: 48px; counter-reset: line; }
	.editor div { display: block; position: relative; white-space: pre-wrap; }
	.editor div::before { content: counter(line); counter-increment: line; position: absolute; right: calc(100% + 16px); opacity: 0.5; }
	</style>
	</head>

	// Check if the user is ready to play!
	confirm("Are you ready to play!");
	var age= prompt("What is your age?");
	if (age< 13)
	{
	//do this code//
	confirm("ask your parent if you can play.");
	}
	else
	//"otherwise"//

	//NON ES6 way
	function actionWord () {
	//Put your action here
	}

	//for example
	//CREATE the function
	function drive () {
	console.log('I am driving now')
	}

	var arr = [];
	var obj = {};
	var fun = function () {};


	var shoppingList = [
	'cheese',
	'milk',
	'bacon'
	];