Fix open-iscsi#704

tcmu_cdb_get_length() will return 10 for vendor specific cdb

tcmur_cmdproc_thread() will not drop vendor specific command

api.c

@@ -51,6 +51,7 @@ int tcmu_cdb_get_length(uint8_t *cdb)
 		return 12;
 	case 6: /*110b Vendor Specific */
 	case 7: /*111b Vendor Specific */
+		return 10;
 	default:
 		/* TODO: */
 		goto cdb_not_supp;
@@ -327,7 +328,6 @@ void tcmu_cdb_print_info(struct tcmu_device *dev,
 	char fix[CDB_FIX_SIZE], *buf;
 
 	buf = fix;
-
 	bytes = tcmu_cdb_get_length(cmd->cdb);
 	if (bytes < 0)
 		return;

main.c

@@ -814,13 +814,23 @@ static void *tcmur_cmdproc_thread(void *arg)
 			if (tcmu_get_log_level() == TCMU_LOG_DEBUG_SCSI_CMD)
 				tcmu_cdb_print_info(dev, cmd, NULL);
 
-			if (tcmur_handler_is_passthrough_only(rhandler))
-				ret = tcmur_cmd_passthrough_handler(dev, cmd);
-			else
-				ret = tcmur_generic_handle_cmd(dev, cmd);
-
-			if (ret == TCMU_STS_NOT_HANDLED)
-				tcmu_cdb_print_info(dev, cmd, "is not supported");
+			if (cmd->cdb[0] <= 0xC0) {
+				if (tcmur_handler_is_passthrough_only(rhandler))
+					ret = tcmur_cmd_passthrough_handler(dev, cmd);
+				else
+					ret = tcmur_generic_handle_cmd(dev, cmd);
+
+			        if (ret == TCMU_STS_NOT_HANDLED)
+					tcmu_cdb_print_info(dev, cmd, "is not supported");			
+			} else {
+				/*
+				 * Vendor specific opcodes are currently not supported in TCMU
+				 * given it requires callbacks that currently don't exist for
+				 * TCMU backstores.
+				 */
+				ret = TCMU_STS_NOT_HANDLED;
+				tcmu_cdb_print_info(dev, cmd, "Vendor specific opcodes not supported.");	
+			}
 
 			/*
 			 * command (processing) completion is called in the following