Samba - prevent locking of selected files over network?

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07-14-2009

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Samba - prevent locking of selected files over network?

I have a samba server which is serving a mixture of files. One main application uses a data file and creates a temporary working execution file at startup and holds that temp execution file open for the duration of the program's execution (but doesn't use the file at all after initial startup).

The problem is when a second user wants to run the application (and they all do) they cannot create/replace the temp file because it is file locked over the network by the other running copy of the application, despite the application not using it any more. The application is a long running program, we're talking hours at a time.

This results in us having to remove the file from the unix file system manually at user request so the next user using the application against the share succeeds in creating the temp file and starting up.

So the question is, is it possible to selectively disable file locking over the network in samba (preferably by regex)?

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tdbbackup

TDBBACKUP(8)															      TDBBACKUP(8)

NAME

       tdbbackup - tool for backing up and for validating the integrity of samba .tdb files

SYNOPSIS

       tdbbackup [-ssuffix] [-v] [-h]

DESCRIPTION

       This tool is part of the samba(1) suite.

       tdbbackup is a tool that may be used to backup samba .tdb files. This tool may also be used to verify the integrity of the .tdb files prior
       to samba startup or during normal operation. If it finds file damage and it finds a prior backup the backup file will be restored.

OPTIONS

       -h
	  Get help information.

       -s suffix
	  The -s option allows the adminisistrator to specify a file backup extension. This way it is possible to keep a  history  of  tdb  backup
	  files by using a new suffix for each backup.

       -v
	  The -v will check the database for damages (currupt data) which if detected causes the backup to be restored.

COMMANDS

       GENERAL INFORMATION

       The  tdbbackup  utility	can safely be run at any time. It was designed so that it can be used at any time to validate the integrity of tdb
       files, even during Samba operation. Typical usage for the command will be:

       tdbbackup [-s suffix] *.tdb

       Before restarting samba the following command may be run to validate .tdb files:

       tdbbackup -v [-s suffix] *.tdb

       Samba .tdb files are stored in various locations, be sure to run backup all .tdb file on the system. Important files includes:

       o

	  secrets.tdb - usual location is in the /usr/local/samba/private directory, or on some systems in /etc/samba.

       o

	  passdb.tdb - usual location is in the /usr/local/samba/private directory, or on some systems in /etc/samba.

       o

	  *.tdb located in the /usr/local/samba/var directory or on some systems in the /var/cache or /var/lib/samba directories.

VERSION

       This man page is correct for version 3.0 of the Samba suite.

AUTHOR

       The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by the  Samba	Team  as  an  Open
       Source project similar to the way the Linux kernel is developed.

       The tdbbackup man page was written by John H Terpstra.

																      TDBBACKUP(8)