1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* -*- linux-c -*- ------------------------------------------------------- *
4 * Copyright 2002-2007 H. Peter Anvin - All Rights Reserved
6 * ----------------------------------------------------------------------- */
11 * Test RAID-6 recovery with various algorithms
17 #include <linux/raid/pq.h>
19 #define NDISKS 16 /* Including P and Q */
21 const char raid6_empty_zero_page[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
22 struct raid6_calls raid6_call;
24 char *dataptrs[NDISKS];
25 char data[NDISKS][PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
26 char recovi[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
27 char recovj[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
29 static void makedata(int start, int stop)
33 for (i = start; i <= stop; i++) {
34 for (j = 0; j < PAGE_SIZE; j++)
37 dataptrs[i] = data[i];
41 static char disk_type(int d)
53 static int test_disks(int i, int j)
57 memset(recovi, 0xf0, PAGE_SIZE);
58 memset(recovj, 0xba, PAGE_SIZE);
63 raid6_dual_recov(NDISKS, PAGE_SIZE, i, j, (void **)&dataptrs);
65 erra = memcmp(data[i], recovi, PAGE_SIZE);
66 errb = memcmp(data[j], recovj, PAGE_SIZE);
68 if (i < NDISKS-2 && j == NDISKS-1) {
69 /* We don't implement the DQ failure scenario, since it's
70 equivalent to a RAID-5 failure (XOR, then recompute Q) */
73 printf("algo=%-8s faila=%3d(%c) failb=%3d(%c) %s\n",
77 (!erra && !errb) ? "OK" :
79 !errb ? "ERRA" : "ERRAB");
82 dataptrs[i] = data[i];
83 dataptrs[j] = data[j];
88 int main(int argc, char *argv[])
90 const struct raid6_calls *const *algo;
91 const struct raid6_recov_calls *const *ra;
95 makedata(0, NDISKS-1);
97 for (ra = raid6_recov_algos; *ra; ra++) {
98 if ((*ra)->valid && !(*ra)->valid())
101 raid6_2data_recov = (*ra)->data2;
102 raid6_datap_recov = (*ra)->datap;
104 printf("using recovery %s\n", (*ra)->name);
106 for (algo = raid6_algos; *algo; algo++) {
107 if ((*algo)->valid && !(*algo)->valid())
113 memset(data[NDISKS-2], 0xee, 2*PAGE_SIZE);
115 /* Generate assumed good syndrome */
116 raid6_call.gen_syndrome(NDISKS, PAGE_SIZE,
119 for (i = 0; i < NDISKS-1; i++)
120 for (j = i+1; j < NDISKS; j++)
121 err += test_disks(i, j);
123 if (!raid6_call.xor_syndrome)
126 for (p1 = 0; p1 < NDISKS-2; p1++)
127 for (p2 = p1; p2 < NDISKS-2; p2++) {
129 /* Simulate rmw run */
130 raid6_call.xor_syndrome(NDISKS, p1, p2, PAGE_SIZE,
133 raid6_call.xor_syndrome(NDISKS, p1, p2, PAGE_SIZE,
136 for (i = 0; i < NDISKS-1; i++)
137 for (j = i+1; j < NDISKS; j++)
138 err += test_disks(i, j);
146 /* Pick the best algorithm test */
150 printf("\n*** ERRORS FOUND ***\n");