--- linux/include/scsi/scsi.h	2004-08-25 10:06:42.597842752 +1000
+++ linux/include/scsi/scsi.h269rc1sl2	2004-08-25 10:20:24.314922768 +1000
@@ -354,14 +354,22 @@
 		     ((lun) & 0x07))
 
 /*
- *  SCSI command sets
+ *  struct scsi_device::scsi_level values. For SCSI devices other than those
+ *  prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
+ *  where "resp" is a byte array of the response to an INQUIRY. The scsi_level
+ *  variable is visible to the user via sysfs.
  */
 
-#define SCSI_UNKNOWN    0
-#define SCSI_1          1
-#define SCSI_1_CCS      2
-#define SCSI_2          3
-#define SCSI_3          4
+enum scsi_level_state {
+	SCSI_UNKNOWN =	0,
+	SCSI_1 =	1,
+	SCSI_1_CCS =	2,
+	SCSI_2 =	3,
+	SCSI_3 =	4,	/* SPC */
+	SCSI_SPC_2 =	5,
+	SCSI_SPC_3 =	6,
+	SCSI_SPC_4 =	7
+};
 
 /*
  * INQ PERIPHERAL QUALIFIERS