RSM_IOCTL_IOVEC
if (RSM_IOCTL_CMDGRP(cmd) == RSM_IOCTL_IOVEC) {
#define RSM_IOCTL_GETV RSM_IOCTL_IOVEC + 0x1
#define RSM_IOCTL_PUTV RSM_IOCTL_IOVEC + 0x2