update

app/controllers/application_controller.rb

@@ -45,5 +45,8 @@ class ApplicationController < ActionController::Base
       return @files
   end
  
-  
+  def checkDir
+    files = file_directory(params[:path])
+    render :json => {:file => files , :current => @current_dir}
+  end
 end

app/controllers/volume_controller.rb

@@ -38,13 +38,6 @@ class VolumeController < ApplicationController
     redirect_to '/volume/info'
   end
   
-  
- 
-  def checkDir
-    files = file_directory(params[:path])
-    render :json => {:file => files , :current => @current_dir}
-  end
-  
   def volume_mount
     @config = get_conf
 	  volume_name = params[:volume_name]

app/views/home/index.html.erb

@@ -207,7 +207,7 @@
     function change_directory(directory){
       $.ajax({
       method: "POST",
-      url: "/volume/changeDir",
+      url: "/application/changeDir",
       data: { path: directory },
       success  : function(result){
           $("#table_div").empty();

config/routes.rb

@@ -6,6 +6,8 @@ Rails.application.routes.draw do
   # You can have the root of your site routed with "root"
   root 'home#index'
 
+  post 'application/changeDir' => 'application#checkDir'
+  
   get 'index' => 'plainpage#index'
   
   #Home
@@ -15,7 +17,6 @@ Rails.application.routes.draw do
   #Volume
   get 'volume/index' => 'volume#index'
   post 'file_upload' => 'volume#file_upload'
-  post 'volume/changeDir' => 'volume#checkDir'
   post 'volume/mount' => "volume#volume_mount"
   get 'volume/start/:volume_name' => "volume#volume_start"
   get 'volume/stop/:volume_name' => "volume#volume_stop"