Forbid two users to read and write the same file

[Franck Y]

Hello everyone.
 I have a problem dealing with samba!
 I have several folder that i share in my harddrive, one of those is PROJET
The problem is i don t want two user to open the same file. In fact i would
like a user
to pen the file and the other one to open it in realdonly.
 Can you tell me whats wrong with my configuration.
 regards,
 Franck

[global]
dns proxy = no
log file = /var/log/samba/%m.log
cups options = raw
guest account = Franck
load printers = no
writable = yes
server string = Samba Server
socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
winbind gid = 16777216-33554431
workgroup = baastel
username map = /etc/samba/smbusers
printcap name = /etc/printcap
winbind uid = 16777216-33554431
max log size = 50



[PROJETS]
write list = @projet
force directory mode = 770
strict locking = yes
force group = projet
sync always = yes
user = @projet
level2 oplocks = yes
case sensitive = no
oplocks = no
map archive = no
path = /home/projets/
only user = yes
msdfs proxy = no
veto oplock files = Projets/
force create mode = 770
create mode = 770
directory mode = 770
locking= yes
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