[Samba] Ubuntu 8.04 breaks samba file locking

[Jeremy Allison]

On Tue, Aug 05, 2008 at 12:50:42AM +0000, Doug Germann wrote:
> Just upgraded Saturday from Ubuntu 7.10 to 8.04.01. File locking in Samba is now
> broken, meaning two different users can have the same file open at the same time
> and edit it.
> 
> Server is RedHat 9.0 running Samba 2.2.7a-security-rollup-fix. This has been
> working well for us for several years. Have one WinXP box accessing the server
> using OOo 2.0. Have another couple of Win95 boxes.
> 
> In addition, have one Ubunutu 6.06 box, and three other 8.04 boxes.
> 
> It appears the XP and the 6.06 box lock files so the other cannot edit them
> while one has them open, but the 8.04 boxes, running OOo 2.4 can access and edit
> and save these files, thus causing havoc.
> 
> The linux clients mount via cifs, such as this line from /etc/fstab:
> //samba1/vol22        /sam/vol22  cifs   
> rw,user,credentials=/[blanked],uid=doug,gid=data      0       0
> 
> 
> This is a production environment.
> 
> Could it be a mis-match between the version of samba on the server and the one
> on the clients?
> 
> Can anybody suggest a solution or at least a trouble-shooting procedure?

Normally what you call "file locking" in this case is really access exclusion
ie. share modes. Use smbstatus on the server to see what open modes the
clients are currently using.

Jeremy.