A normal user has read and write access to the /tmp-folder. If someone decides to "block" other users from using the system, the person can just fill up the /tmp-folder until it's full (with echo /dev/null>/tmp/bigfile or something like that), so no other user can write data to it (simply because it's full). Can I limit how much size, as maximum, of a certain mounting point (in this case /tmp) a user can use? Do I need to have /tmp on its own partition? It is possible to limit all files in the ~ (a user's home folder) to a maximum at, let's say 0.5 GiB, excluded the .thunderbird-folder (in other words, the content in the .thunderbird-folder will not included in the limit at 0.5 GiB)?