Comment 4 for bug 1789922

Nevermind, it still doesn't work on the right disk. While the disk is not mounted initially, by the time unuse_data_iterate() is called, it has been mounted for some reason. I'm thinking there is a race condition where something mounts the fs temporarily and unmounts it, and during the time it is mounted is when unuse_data_iterate() is called, which sees it is mounted, and tries to unmount it, but by the time the unmount request goes through, it has already been unmounted.