[Samba] strang locking behaviour with macosx clients

[Holger Hegmanns]

I'm running a samba pdc on my gentoo box in a mixed environment with a
couple of Windows XP clients and only a few MacOSX clients. The users
told me, the file locking across the platforms does not work properly
sometimes.

I tried to google my problem, but without luck. I switched all the flags
related the lock mechanism of samba on and off, but the problem seems to
be solved yet.

The only debug information I have is the output of smbstatus. The column
"DenyMode" looks totally different if a mac or a windows client opens
the same file.

A *windows* client opens a file:
[...]
Locked files:
Pid          Uid        DenyMode   Access      R/W        Oplock
   SharePath   Name   Time
--------------------------------------------------------------------------------------------------
19919        501        DENY_ALL   0x2019f     RDWR
EXCLUSIVE+BATCH  /data0/prod   ~test~0kjyv(.idlk   Tue Sep 30 00:50:24 2008
19919        501        DENY_WRITE 0x20089     RDONLY
EXCLUSIVE+BATCH  /data0/prod   test.indd   Tue Sep 30 00:50:24 2008

A *mac* client opens a file:
[...]
Locked files:
Pid          Uid        DenyMode   Access      R/W        Oplock
   SharePath   Name   Time
--------------------------------------------------------------------------------------------------
19564        501        DENY_NONE  0x20007     RDWR       NONE
   /data0/prod   ~test~0kjyv(.idlk   Tue Sep 30 00:51:43 2008
19564        501        DENY_NONE  0x20001     RDONLY     NONE
   /data0/prod   test.indd   Tue Sep 30 00:51:43 2008

Believe it or not, but generally windows denies the opening of a file
that is already opened on a mac.

Any help is appreciated.
Sorry for my poor english.