Merge branch 'v6v7' into devel
[linux/fpc-iii.git] / lib / raid6 / test / test.c
blob7a930318b17d60c406bb1d421ba406c0f3bcb139
1 /* -*- linux-c -*- ------------------------------------------------------- *
3 * Copyright 2002-2007 H. Peter Anvin - All Rights Reserved
5 * This file is part of the Linux kernel, and is made available under
6 * the terms of the GNU General Public License version 2 or (at your
7 * option) any later version; incorporated herein by reference.
9 * ----------------------------------------------------------------------- */
12 * raid6test.c
14 * Test RAID-6 recovery with various algorithms
17 #include <stdlib.h>
18 #include <stdio.h>
19 #include <string.h>
20 #include <linux/raid/pq.h>
22 #define NDISKS 16 /* Including P and Q */
24 const char raid6_empty_zero_page[PAGE_SIZE] __attribute__((aligned(256)));
25 struct raid6_calls raid6_call;
27 char *dataptrs[NDISKS];
28 char data[NDISKS][PAGE_SIZE];
29 char recovi[PAGE_SIZE], recovj[PAGE_SIZE];
31 static void makedata(void)
33 int i, j;
35 for (i = 0; i < NDISKS; i++) {
36 for (j = 0; j < PAGE_SIZE; j++)
37 data[i][j] = rand();
39 dataptrs[i] = data[i];
43 static char disk_type(int d)
45 switch (d) {
46 case NDISKS-2:
47 return 'P';
48 case NDISKS-1:
49 return 'Q';
50 default:
51 return 'D';
55 static int test_disks(int i, int j)
57 int erra, errb;
59 memset(recovi, 0xf0, PAGE_SIZE);
60 memset(recovj, 0xba, PAGE_SIZE);
62 dataptrs[i] = recovi;
63 dataptrs[j] = recovj;
65 raid6_dual_recov(NDISKS, PAGE_SIZE, i, j, (void **)&dataptrs);
67 erra = memcmp(data[i], recovi, PAGE_SIZE);
68 errb = memcmp(data[j], recovj, PAGE_SIZE);
70 if (i < NDISKS-2 && j == NDISKS-1) {
71 /* We don't implement the DQ failure scenario, since it's
72 equivalent to a RAID-5 failure (XOR, then recompute Q) */
73 erra = errb = 0;
74 } else {
75 printf("algo=%-8s faila=%3d(%c) failb=%3d(%c) %s\n",
76 raid6_call.name,
77 i, disk_type(i),
78 j, disk_type(j),
79 (!erra && !errb) ? "OK" :
80 !erra ? "ERRB" :
81 !errb ? "ERRA" : "ERRAB");
84 dataptrs[i] = data[i];
85 dataptrs[j] = data[j];
87 return erra || errb;
90 int main(int argc, char *argv[])
92 const struct raid6_calls *const *algo;
93 int i, j;
94 int err = 0;
96 makedata();
98 for (algo = raid6_algos; *algo; algo++) {
99 if (!(*algo)->valid || (*algo)->valid()) {
100 raid6_call = **algo;
102 /* Nuke syndromes */
103 memset(data[NDISKS-2], 0xee, 2*PAGE_SIZE);
105 /* Generate assumed good syndrome */
106 raid6_call.gen_syndrome(NDISKS, PAGE_SIZE,
107 (void **)&dataptrs);
109 for (i = 0; i < NDISKS-1; i++)
110 for (j = i+1; j < NDISKS; j++)
111 err += test_disks(i, j);
113 printf("\n");
116 printf("\n");
117 /* Pick the best algorithm test */
118 raid6_select_algo();
120 if (err)
121 printf("\n*** ERRORS FOUND ***\n");
123 return err;