Comment # 15 on bug 1181018 from Kurt Garloff

Sidenote: This in no way implies that the patch to libblkid1 is incorrect.
It might very well be a strangeness elsewhere
* The kernel not clearing the medium change flag when opening a floppy with
O_NONBLOCK
* qemu passing a changed media in the first place
* mount in cloud-init depending someone (via libblkid1) having accessed fd0
before and cleared the medium change flag this way

On the other hand it's a regression and it might be the safest choice for
maintenance to just add a special case for floppies in libblkid1 and avoid the
O_NONBLOCK in that case.