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I'm writing a software for Linux which would actively work with user's files in background concurrently with other applications that I don't control. I want to make my background application to not overwrite changes made by other applications. But there is a problem - unlike Windows Linux doesn't provide mandatory file locking capability which creates possibility of ruining user's work due to race conditions which I'd like to avoid.
So I wonder - are there file-systems available on Linux that provide some kind of synchronization mechanisms such as compare-and-swap operation, all-or-nothing transactions, mandatory file locking (like in Windows)?
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Synchronized I/O is useful when the integrity of data and files is critical to an application. Synchronized output assures that data that is written to a device is actually stored there. Synchronized input assures that data that is read from a device is a current image of data on that device.
Edit the crontab file by creating a cron job schedule for syncing your two Linux servers' directory files. Save and close the crontab file. The above-implemented cron job will automatically sync the backup/secondary server with the main/primary server after every 5 minutes.
Rename is atomic. It is up to your application to compare "eTags" of source and destination (possibly under appropriate locks) before deciding on calling rename().
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