IOCTL_Command_struct
IOCTL_Command_struct *iocommand);
IOCTL_Command_struct arg64;
if (copy_from_user(&arg64, arg32, offsetof(IOCTL_Command_struct, buf)))
IOCTL_Command_struct *iocommand)
IOCTL_Command_struct iocommand;
IOCTL_Command_struct iocommand;
#define CCISS_PASSTHRU _IOWR(CCISS_IOC_MAGIC, 11, IOCTL_Command_struct)