TESTS: add a flag --usb so we can clamp all i/o to at most 120k

Add checks for maximum tranfer length to all commands that are limited
by BlockLimits/MTL

test-tool/test_writesame16_simple.c

@@ -16,6 +16,7 @@
 */
 
 #include <stdio.h>
+#include <alloca.h>
 
 #include <CUnit/CUnit.h>
 
@@ -29,7 +30,9 @@ void
 test_writesame16_simple(void)
 {
 	int i, ret;
+	unsigned char *buf = alloca(block_size);
 
+	
 	CHECK_FOR_DATALOSS;
 	CHECK_FOR_SBC;
 
@@ -37,13 +40,11 @@ test_writesame16_simple(void)
 	logging(LOG_VERBOSE, "Test WRITESAME16 of 1-256 blocks at the start of the LUN");
 
 	for (i = 1; i <= 256; i++) {
-		unsigned char *buf = malloc(block_size);
-
 		ret = writesame16(iscsic, tgt_lun, 0,
 				  block_size, i,
 				  0, 0, 0, 0, buf);
-		free(buf);
 		if (ret == -2) {
+			logging(LOG_NORMAL, "[SKIPPED] WRITEVERIFY16 is not implemented.");
 			CU_PASS("[SKIPPED] Target does not support WRITESAME16. Skipping test");
 			return;
 		}
@@ -52,12 +53,9 @@ test_writesame16_simple(void)
 
 	logging(LOG_VERBOSE, "Test WRITESAME16 of 1-256 blocks at the end of the LUN");
 	for (i = 1; i <= 256; i++) {
-		unsigned char *buf = malloc(block_size );
-
 		ret = writesame16(iscsic, tgt_lun, num_blocks - i,
 				  block_size, i,
 				  0, 0, 0, 0, buf);
-		free(buf);
 		CU_ASSERT_EQUAL(ret, 0);
 	}