Better sygnalize the EV unlocking

[szszszsz]

In case we are using MBR (main partition in /dev/sdb1 instead of using directly /dev/sdb), if we unlock the key, only /dev/sdb appears.

We have to try to mount /dev/sdb (which is not possible) and then the linux kernel start to see /dev/sdb1 (!).

The block device for the EV (Encrypted Volume) is always available to the OS, but its data are only after the device's unlocking (and only then the partition is available). OS is not refreshing the block device contents, until the 'mount' command is called.

Better synchronization with the OS in that matter would be desired.

[szszszsz]

• [ ] To do: compare the behavior with the hidden volume AFAIR block device is removed then for a moment, and this is advertised to the OS successfully

[szszszsz]

Note: see setting block device capacity to '0'.