Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / lib / raid6 / test / test.c

diff --git a/kernel/lib/raid6/test/test.c b/kernel/lib/raid6/test/test.c
new file mode 100644 (file)
index 0000000..3bebbab
--- /dev/null
+++ b/kernel/lib/raid6/test/test.c
@@ -0,0 +1,155 @@
+/* -*- linux-c -*- ------------------------------------------------------- *
+ *
+ *   Copyright 2002-2007 H. Peter Anvin - All Rights Reserved
+ *
+ *   This file is part of the Linux kernel, and is made available under
+ *   the terms of the GNU General Public License version 2 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 <linux/raid/pq.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];
+
+static void makedata(int start, int stop)
+{
+       int i, j;
+
+       for (i = start; i <= stop; i++) {
+               for (j = 0; j < PAGE_SIZE; j++)
+                       data[i][j] = rand();
+
+               dataptrs[i] = data[i];
+       }
+}
+
+static char disk_type(int d)
+{
+       switch (d) {
+       case NDISKS-2:
+               return 'P';
+       case NDISKS-1:
+               return 'Q';
+       default:
+               return 'D';
+       }
+}
+
+static int test_disks(int i, int j)
+{
+       int erra, errb;
+
+       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) */
+               erra = errb = 0;
+       } else {
+               printf("algo=%-8s  faila=%3d(%c)  failb=%3d(%c)  %s\n",
+                      raid6_call.name,
+                      i, disk_type(i),
+                      j, disk_type(j),
+                      (!erra && !errb) ? "OK" :
+                      !erra ? "ERRB" :
+                      !errb ? "ERRA" : "ERRAB");
+       }
+
+       dataptrs[i] = data[i];
+       dataptrs[j] = data[j];
+
+       return erra || errb;
+}
+
+int main(int argc, char *argv[])
+{
+       const struct raid6_calls *const *algo;
+       const struct raid6_recov_calls *const *ra;
+       int i, j, p1, p2;
+       int err = 0;
+
+       makedata(0, NDISKS-1);
+
+       for (ra = raid6_recov_algos; *ra; ra++) {
+               if ((*ra)->valid  && !(*ra)->valid())
+                       continue;
+
+               raid6_2data_recov = (*ra)->data2;
+               raid6_datap_recov = (*ra)->datap;
+
+               printf("using recovery %s\n", (*ra)->name);
+
+               for (algo = raid6_algos; *algo; algo++) {
+                       if ((*algo)->valid && !(*algo)->valid())
+                               continue;
+
+                       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++)
+                                       err += test_disks(i, j);
+
+                       if (!raid6_call.xor_syndrome)
+                               continue;
+
+                       for (p1 = 0; p1 < NDISKS-2; p1++)
+                               for (p2 = p1; p2 < NDISKS-2; p2++) {
+
+                                       /* Simulate rmw run */
+                                       raid6_call.xor_syndrome(NDISKS, p1, p2, PAGE_SIZE,
+                                                               (void **)&dataptrs);
+                                       makedata(p1, p2);
+                                       raid6_call.xor_syndrome(NDISKS, p1, p2, PAGE_SIZE,
+                                                                (void **)&dataptrs);
+
+                                       for (i = 0; i < NDISKS-1; i++)
+                                               for (j = i+1; j < NDISKS; j++)
+                                                       err += test_disks(i, j);
+                               }
+
+               }
+               printf("\n");
+       }
+
+       printf("\n");
+       /* Pick the best algorithm test */
+       raid6_select_algo();
+
+       if (err)
+               printf("\n*** ERRORS FOUND ***\n");
+
+       return err;
+}