samba - Jun 2005 - Very strange problems with file locking and Samba 3.0.14

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Hi everyone,

at office, we have very strange problems with file locking.
At first, I have to say that we have many different flavours of  
Windows running here as clients, it reaches from Windows 98 up to  
Windows XP Home Edition/Professional Edition.
The following problem mainly exists with software like AutoCAD (LT  
95/2000, 2000, 2003, 2005) and Microsoft Office (95, 97, 2000, XP):
When one client opens a file for writing, lets say an AutoCAD drawing  
(*.dwg), Samba sets a DENY_WRITE on that file, sometimes with an  
oplock, depending on the client system, the output of smbstatus -L is  
the following:

Locked files:
Pid    DenyMode   Access      R/W        Oplock           Name
- --------------------------------------------------------------
40526  DENY_WRITE 0x2019f     RDWR       NONE             /path/to/ 
data/somedrawing.dwg   Sat Jun 11 14:05:58 2005

After that, a second client (with different username, maybe different  
group) opens the same file with the same or a different version of  
the same program, after that, the output of smbclient -L is the  
following:

Locked files:
Pid    DenyMode   Access      R/W        Oplock           Name
- --------------------------------------------------------------
40389  DENY_WRITE 0x3     RDWR       NONE             /path/to/data/ 
somedrawing.dwg   Sat Jun 11 14:06:02 2005

As you can see, the lock has switched the owner, which should not  
occur. Additionally, the Access Mode has changed from 0x2019f to 0x3,  
whatever this means (I'm not too deep into SMB techs).

The outcome of this whole procedure is, that data is *lost* (one  
client opens a file, changes it, second client opens while first is  
working, first client saves, second client saves too, work of first  
client is lost, etc...). What we wish to have is that p.e. AutoCAD  
says - when a second client tries to open a file which has already  
been opened by another client - "this file is already being edited.  
Cannot open for writing. Open read-only?".

Does anyone have a clue why this is happening? I think it is a really  
strange behaviour, since under old NT4, it worked.

Please help, we already lost a good bunch of data due to this problem  
named above :(

Thanks anyone for listening; the smb.conf is attached to this mailing!

Best regards,

Ulrik Guenther

====smb.conf of server:
[global]
    netbios name = SERVER1
    workgroup = WORKGROUP
    server string = LDAP PDC
    ldap passwd sync = yes
    passdb backend = ldapsam:ldap://127.0.0.1/
    ldap admin dn = cn=Manager,dc=workgroup,dc=local
    ldap suffix = dc=workgroup,dc=local
    ldap group suffix = ou=Groups
    ldap user suffix = ou=Users
    ldap machine suffix = ou=Computers
    syslog = yes
    log file = /data/samba/log/samba.log
    os level = 65
    preferred master = yes
    domain master = yes
    local master = yes
    security = user
    encrypt passwords = yes
    domain logons = yes
    logon path = \\SERVER1\profiles\%U
    logon drive = H:
    logon home = \\SERVER1\homes\%U
    logon script = netlogon.bat

    add user script = /usr/local/sbin/smbldap-useradd -m "%u"
    ldap delete dn = yes
    add machine script = /usr/local/sbin/smbldap-useradd -w "%u"
    add group script = /usr/local/sbin/smbldap-groupadd -p "%g"
    add user to group script = /usr/local/sbin/smbldap-groupmod -m "% 
u" "%g"
    delete user from group script = /usr/local/sbin/smbldap-groupmod - 
x "%u" "%g"
    set primary group script = /usr/local/sbin/smbldap-usermod -g "% 
g" "%u"

    dos charset = 850
    mangling method = hash2
    mangling char = ~
    mangle prefix = 6
    display charset = ISO8859-1
    unix charset = ISO8859-1
    admin users = Administrator
    printcap name = cups
    load printers = yes
[printers]
    comment = Drucker
    printing = CUPS
    printable = yes
    create mask = 0600
    path = /data/printers
    browseable = yes
    guest ok = yes

[netlogon]
    path = /data/netlogon
    comment = Network Logon Service
    read only = yes
    write list = @"Domain Admins"
    browseable = no
    guest ok = yes

[profiles]
    comment = Nutzerprofile
    path = /data/profiles
    read only = no
    browseable = no
    create mask = 0664
    directory mask = 0775
    profile acls = Yes
    guest ok = yes
    force user = %U
    valid users = %U @"Domain Admins"

[homes]
    comment = Dateien von %U (%u)
    read only = no
    create mask = 0644
    directory mask = 0775
    browseable = no

[Programme]
    path = /data/shares/programme
    comment = Programme
    read only = no
    create mask = 0644
    directory mask = 0775
    browseable = yes
    guest ok = yes

[Daten]
    path = /data/shares/daten
    comment = Daten
    read only = no
    create mask = 0664
    directory mask = 0775
    browseable = yes
    guest ok = no
    valid users = %U @"Domain Users" @"Domain Admins"
    oplocks = no

[Admin]
    path = /data/shares/admin
    comment = administrative Freigabe
    read only = no
    create mask = 0644
    directory mask = 0775
    browseable = yes
    guest ok = no
    valid users = %U @"Domain Admins"
    force group = "Domain Admins"

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