summaryrefslogtreecommitdiffstats
path: root/drivers/md/raid6test/test.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/md/raid6test/test.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/md/raid6test/test.c')
-rw-r--r--drivers/md/raid6test/test.c103
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 00000000000..0d5cd57accd
--- /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;
+}