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)));
23 char *dataptrs[NDISKS];
24 char data[NDISKS][PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
25 char recovi[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
26 char recovj[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
28 static void makedata(int start, int stop)
32 for (i = start; i <= stop; i++) {
33 for (j = 0; j < PAGE_SIZE; j++)
36 dataptrs[i] = data[i];
40 static char disk_type(int d)
52 static int test_disks(int i, int j)
56 memset(recovi, 0xf0, PAGE_SIZE);
57 memset(recovj, 0xba, PAGE_SIZE);
62 raid6_dual_recov(NDISKS, PAGE_SIZE, i, j, (void **)&dataptrs);
64 erra = memcmp(data[i], recovi, PAGE_SIZE);
65 errb = memcmp(data[j], recovj, PAGE_SIZE);
67 if (i < NDISKS-2 && j == NDISKS-1) {
68 /* We don't implement the DQ failure scenario, since it's
69 equivalent to a RAID-5 failure (XOR, then recompute Q) */
72 printf("algo=%-8s faila=%3d(%c) failb=%3d(%c) %s\n",
76 (!erra && !errb) ? "OK" :
78 !errb ? "ERRA" : "ERRAB");
81 dataptrs[i] = data[i];
82 dataptrs[j] = data[j];
87 int main(int argc, char *argv[])
89 const struct raid6_calls *const *algo;
90 const struct raid6_recov_calls *const *ra;
94 makedata(0, NDISKS-1);
96 for (ra = raid6_recov_algos; *ra; ra++) {
97 if ((*ra)->valid && !(*ra)->valid())
100 raid6_2data_recov = (*ra)->data2;
101 raid6_datap_recov = (*ra)->datap;
103 printf("using recovery %s\n", (*ra)->name);
105 for (algo = raid6_algos; *algo; algo++) {
106 if ((*algo)->valid && !(*algo)->valid())
112 memset(data[NDISKS-2], 0xee, 2*PAGE_SIZE);
114 /* Generate assumed good syndrome */
115 raid6_call.gen_syndrome(NDISKS, PAGE_SIZE,
118 for (i = 0; i < NDISKS-1; i++)
119 for (j = i+1; j < NDISKS; j++)
120 err += test_disks(i, j);
122 if (!raid6_call.xor_syndrome)
125 for (p1 = 0; p1 < NDISKS-2; p1++)
126 for (p2 = p1; p2 < NDISKS-2; p2++) {
128 /* Simulate rmw run */
129 raid6_call.xor_syndrome(NDISKS, p1, p2, PAGE_SIZE,
132 raid6_call.xor_syndrome(NDISKS, p1, p2, PAGE_SIZE,
135 for (i = 0; i < NDISKS-1; i++)
136 for (j = i+1; j < NDISKS; j++)
137 err += test_disks(i, j);
145 /* Pick the best algorithm test */
149 printf("\n*** ERRORS FOUND ***\n");