Hello, My clients are PC Linux RH 7.3. My server too. A C application run on my clients and access files on my shares (smbmount) with fopen. For the moment, I couldn't manage any lock on my files when I open them with my application from several clients with several users. I'd like to. So, one way may be to use a VFS on open and close. Has anybody work on such a VFS ? If yes, I thank you to send me an example of your code. Fred PS : if you have any other good idea to answer my request (lock on files from Linux client), it will be wellcome.