1 files changed, 103 insertions, 0 deletions
diff --git a/drivers/md/raid6test/test.c b/drivers/md/raid6test/test.c
new file mode 100644
index 000000000000..0d5cd57accd7
--- /dev/null
+++ b/drivers/md/raid6test/test.c
@@ -0,0 +1,103 @@
+/* -*- linux-c -*- ------------------------------------------------------- *
+ *
+ *   Copyright 2002 H. Peter Anvin - All Rights Reserved
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
+ *   Bostom MA 02111-1307, USA; either version 2 of the License, or
+ *   (at your option) any later version; incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * raid6test.c
+ *
+ * Test RAID-6 recovery with various algorithms
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include "raid6.h"
+
+#define NDISKS		16	/* Including P and Q */
+
+const char raid6_empty_zero_page[PAGE_SIZE] __attribute__((aligned(256)));
+struct raid6_calls raid6_call;
+
+char *dataptrs[NDISKS];
+char data[NDISKS][PAGE_SIZE];
+char recovi[PAGE_SIZE], recovj[PAGE_SIZE];
+
+void makedata(void)
+{
+	int i, j;
+
+	for (  i = 0 ; i < NDISKS ; i++ ) {
+		for ( j = 0 ; j < PAGE_SIZE ; j++ ) {
+			data[i][j] = rand();
+		}
+		dataptrs[i] = data[i];
+	}
+}
+
+int main(int argc, char *argv[])
+{
+	const struct raid6_calls * const * algo;
+	int i, j;
+	int erra, errb;
+
+	makedata();
+
+	for ( algo = raid6_algos ; *algo ; algo++ ) {
+		if ( !(*algo)->valid || (*algo)->valid() ) {
+			raid6_call = **algo;
+
+			/* Nuke syndromes */
+			memset(data[NDISKS-2], 0xee, 2*PAGE_SIZE);
+
+			/* Generate assumed good syndrome */
+			raid6_call.gen_syndrome(NDISKS, PAGE_SIZE, (void **)&dataptrs);
+
+			for ( i = 0 ; i < NDISKS-1 ; i++ ) {
+				for ( j = i+1 ; j < NDISKS ; j++ ) {
+					memset(recovi, 0xf0, PAGE_SIZE);
+					memset(recovj, 0xba, PAGE_SIZE);
+
+					dataptrs[i] = recovi;
+					dataptrs[j] = recovj;
+
+					raid6_dual_recov(NDISKS, PAGE_SIZE, i, j, (void **)&dataptrs);
+
+					erra = memcmp(data[i], recovi, PAGE_SIZE);
+					errb = memcmp(data[j], recovj, PAGE_SIZE);
+
+					if ( i < NDISKS-2 && j == NDISKS-1 ) {
+						/* We don't implement the DQ failure scenario, since it's
+						   equivalent to a RAID-5 failure (XOR, then recompute Q) */
+					} else {
+						printf("algo=%-8s  faila=%3d(%c)  failb=%3d(%c)  %s\n",
+						       raid6_call.name,
+						       i, (i==NDISKS-2)?'P':'D',
+						       j, (j==NDISKS-1)?'Q':(j==NDISKS-2)?'P':'D',
+						       (!erra && !errb) ? "OK" :
+						       !erra ? "ERRB" :
+						       !errb ? "ERRA" :
+						       "ERRAB");
+					}
+
+					dataptrs[i] = data[i];
+					dataptrs[j] = data[j];
+				}
+			}
+		}
+		printf("\n");
+	}
+
+	printf("\n");
+	/* Pick the best algorithm test */
+	raid6_select_algo();
+
+	return 0;
+}