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