Allow to unconditionally up subdisks with the -f option.
Allow to unconditionally up subdisks with the -f option.

Change returns for failed state changes from EINVAL to EBUSY.

Suggested-by:  Bernd Walter <850f4ee360282b8635da69a01a7b8b9eeb565692@cicely.de>

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase