Mikael Djurfeldt <mikael@djurfeldt.com> writes:

> We could, in addition to "stat", provide "statfs" (on systems that provide
> it).
>
> The test could then first test for the presence of "statfs" and then check
> if the filesystem is ext4.

Here's what I've done in Debian for now after double-checking the
test on a few filesystems: