scst_vdisk, CD-ROM: Change error code returned if no medium present

If my interpretation of section "6.37 TEST UNIT READY command" in SPC-4
is correct then TEST UNIT READY should report "MEDIUM NOT PRESENT" if no
medium is present instead of "LOGICAL UNIT NOT READY, AUXILIARY MEMORY
NOT ACCESSIBLE".

Signed-off-by: Bart Van Assche <bvanassche@acm.org>



git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@4307 d57e44dd-8a1f-0410-8b47-8ef2f437770f

scst/include/scst_const.h

@@ -241,7 +241,8 @@ enum scst_cdb_flags {
 
 /*************************************************************
  ** Sense data for the appropriate errors. Can be used with
- ** scst_set_cmd_error()
+ ** scst_set_cmd_error(). Column order: key, ASC, ASCQ. See
+ ** also http://www.t10.org/lists/asc-num.htm.
  *************************************************************/
 #define scst_sense_no_sense			NO_SENSE,        0x00, 0
 #define scst_sense_hardw_error			HARDWARE_ERROR,  0x44, 0
@@ -264,6 +265,7 @@ enum scst_cdb_flags {
 #define scst_sense_read_error			MEDIUM_ERROR,    0x11, 0
 #define scst_sense_write_error			MEDIUM_ERROR,    0x03, 0
 #define scst_sense_not_ready			NOT_READY,       0x04, 0x10
+#define scst_sense_no_medium			NOT_READY,       0x3a, 0
 #define scst_sense_invalid_message		ILLEGAL_REQUEST, 0x49, 0
 #define scst_sense_cleared_by_another_ini_UA	UNIT_ATTENTION,  0x2F, 0
 #define scst_sense_capacity_data_changed	UNIT_ATTENTION,  0x2A, 0x9

scst/src/dev_handlers/scst_vdisk.c

@@ -1821,8 +1821,7 @@ static int vcdrom_exec(struct scst_cmd *cmd)
 
 	if (virt_dev->cdrom_empty && (opcode != INQUIRY)) {
 		TRACE_DBG("%s", "CDROM empty");
-		scst_set_cmd_error(cmd,
-			SCST_LOAD_SENSE(scst_sense_not_ready));
+		scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_sense_no_medium));
 		goto out_done;
 	}