[Samba] Acl and mask issue

[Maxime Woznicki]

Hello all,

I've set up a samba 3.0.14a on debian with kernel 2.6.5 with ext3 and 
acl support.
Samba is running as a simple PDC just to share efficiently and to manage 
permissions on shares.

My problem is really simple : How to force file creation mode to 
rwxr-x--- (0640) and directory creation mode to rwxr-x--- (0750) for all 
users of the same group ?
I've set a lot of parameters to manage this but result is always the same :
files are created with rwxrwx--- permissions
directories are created with rwxrwxr-x permissions

Notice : Files and directories are created from an XP pro box

the root share :
# getfacl /share
user::rwx
group::r-x
other::r-x
default:user::rwx
default:group::r-x
default:other::r-x

 From windows as Administrator, I created a dedicated directory for 
group RD and give to it full control (with security panel):
# getfacl /share/RD
user::rwx
group::r-x
group:RD:rwx
mask::rwx
other::---
default:user::rwx
default:group::r-x
default:group:RD:rwx
default:mask::rwx
default:other::---

Then from windows as an RD member, if I create a file or a directory in 
RD directory, the group flag "w" is set... I don't want it.


My configuration :

[share]
   hide dot files = yes
   writable = yes
   path = /share
   public = no
   force create mask = 0640
   force directory mask = 0750
   directory security mask = 0775
   security mask = 0774
   valid users = %U
   admin users = Administrator root
   vfs object = recycle:recycle
   recycle:repository = .deleted
   recycle:keeptree = yes
   recycle:touch = yes
   recycle:versions = yes
   nt acl support = yes
;   inherit acls = yes      (should I uncomment it ? I've tried but 
doesn't change anything)
   oplocks = no
   level2 oplocks = no
   locking = yes
   blocking locks = yes


Thx for help, I'm becoming crazy.

Max