CageFS makes sure that each user has his own /tmp directory, and that directory is part of end-user's quota.
The actual location of the directory is $USER_HOME/.cagefs/tmp
Once a day, using cron job, CageFS will clean up user's /tmp directory from all the files that haven't been accessed during 30 days.
This can be changed by running:
Where 720 is the number of hours that the file had to be inaccessible to be removed.
By default this is done at 03:37 AM, but you can also force the clean up outdated files that match 'chosen period' of all user's /tmp directories without waiting for a job to be launched by cronjob. Just run:
$ cagefsctl --tmpwatch