* to be set. If the random percentage value is within the user specified
* percentage of I/Os that should use a cmdprio priority value (rather than
* the default priority), then this function updates the io_u with an ioprio
* to be set. If the random percentage value is within the user specified
* percentage of I/Os that should use a cmdprio priority value (rather than
* the default priority), then this function updates the io_u with an ioprio