mly_ioctl_getlogdevinfovalid
mc->mc_length = sizeof(struct mly_ioctl_getlogdevinfovalid);
struct mly_ioctl_getlogdevinfovalid *ldi;
ldi = (struct mly_ioctl_getlogdevinfovalid *)mc->mc_data;
struct mly_ioctl_getlogdevinfovalid logdev;