listmount() and statmount()

BTW, one addendum. The reason why systemd considers the mount ID a 32bit entity is simply because the kernel exports it like that. i.e. name_to_handle_at() was the first kernel API to expose the mount ID to userspace in binary form, and it used an "int" for that, see man page. We then adopted that, since that's apparently what the kernel wants us to use.

Lennart