On my Tumbleweed machine, /tmp is a btrfs subvolume. This means that my
temporary files are not actually temporary (they persist across reboots), and
they take up disk space for no good reason.

% cat /proc/self/mountinfo | grep /tmp
78 61 0:35 /tmp /tmp rw,relatime shared:31 - btrfs /dev/mapper/system-root
rw,ssd,space_cache,subvolid=262,subvol=/tmp
86 61 0:35 /var/tmp /var/tmp rw,relatime shared:38 - btrfs
/dev/mapper/system-root rw,ssd,space_cache,subvolid=274,subvol=/var/tmp

Any chance this could be changed to instead use tmpfs?