Otherwise #opt_params is the number of following arguments.
Example of optional parameters section:
- 1 allow_discards
+ 2 allow_discards same_cpu_crypt
allow_discards
Block discard requests (a.k.a. TRIM) are passed through the crypt device.
used space etc.) if the discarded blocks can be located easily on the
device later.
+same_cpu_crypt
+ Perform encryption using the same cpu that IO was submitted on.
+ The default is to use an unbound workqueue so that encryption work
+ is automatically balanced between available CPUs.
+
Example scripts
===============
LUKS (Linux Unified Key Setup) is now the preferred way to set up disk