Does this mean that all inodes and the super block for a device are now
purged when a device is unmounted? Previously the inodes and sb would
be kept and only purged when the device was remounted *and* a media
change was flagged.
Historically the media change flag was not always detected on some
removable disks and the old inodes/sb would be used for a new disk, a
good way to corrupt the data. IMHO it makes much more sense to purge
on unmount rather than delaying for the next mount.