BLK_SCSI_CMD_PER_LONG   24 block/scsi_ioctl.c 	unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
BLK_SCSI_CMD_PER_LONG   25 block/scsi_ioctl.c 	unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];