samba服务器共享目录windows系统能浏览写入,LINUX下只能是只读,求解

samba服务器配置如下：
[global]
  workgroup = workgroup
  server string = Linux Samba Server
  netbios name = sambaserver
  security = share
  load printers = no
[files]
  path = /app/files
  writeable = Yes
  browseable = Yes
  guest ok = Yes
[maps]
  path = /app/maps
  writeable = Yes
  create mode = 0777
  directory mode = 0777
  browseable = Yes
  guest ok = Yes

linux刚刚学，很多都不太懂，希望可以高人多多指点。
现在在window2003，能够直接访问共享文件夹，并可以创建文件。但在linux下，挂载完文件后，要进行写入，提示，文档是只读的。我已经给共享文件夹chmod 777 /app/maps 和 chmod 777 /app/files 。求解答

附：[root@192 ~]# testparm
Load smb config files from /etc/samba/smb.conf
Processing section "[files]"
Processing section "[maps]"
Loaded services file OK.
Server role: ROLE_STANDALONE
Press enter to see a dump of your service definitions

在共享目录设置部分加上
public = yes
呢