Samba服务的配置问题?

我使用的是fedora core linux 5  ,在做samba服务时使用testparm命令检查老是有WARNING: passdb expand explicit = yes is deprecated这句话,该怎么做,请高手指教，谢谢。

Load smb config files from /etc/samba/smb.conf
Processing section "[homes]"
Processing section "[printers]"
Processing section "[wode]"
Loaded services file OK.
WARNING: passdb expand explicit = yes is deprecated
Server role: ROLE_STANDALONE
Press enter to see a dump of your service definitions
[global]
        netbios name = LINUX
        server string = Samba Server
        username map = /etc/samba/smbusers
        log file = /var/log/samba/%m.log
        max log size = 50
        socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
        printcap name = /etc/printcap
        dns proxy = No
        cups options = raw

[homes]
        comment = Home Directories
        read only = No
        browseable = No

[printers]
        comment = All Printers
        path = /var/spool/samba
        printable = Yes
        browseable = No

[wode]
        comment = samba server
        path = /home/samba
        write list = fuchen
        read only = No

查一下用戶驗証機制有沒有問題