LXR linux/lib/raid6/test/test.c

   1/* -*- linux-c -*- ------------------------------------------------------- *
   2 *
   3 *   Copyright 2002-2007 H. Peter Anvin - All Rights Reserved
   4 *
   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.
   8 *
   9 * ----------------------------------------------------------------------- */
  10
  11/*
  12 * raid6test.c
  13 *
  14 * Test RAID-6 recovery with various algorithms
  15 */
  16
  17#include <stdlib.h>
  18#include <stdio.h>
  19#include <string.h>
  20#include <linux/raid/pq.h>
  21
  22#define NDISKS          16      /* Including P and Q */
  23
  24const char raid6_empty_zero_page[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
  25struct raid6_calls raid6_call;
  26
  27char *dataptrs[NDISKS];
  28char data[NDISKS][PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
  29char recovi[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
  30char recovj[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
  31
  32static void makedata(int start, int stop)
  33{
  34        int i, j;
  35
  36        for (i = start; i <= stop; i++) {
  37                for (j = 0; j < PAGE_SIZE; j++)
  38                        data[i][j] = rand();
  39
  40                dataptrs[i] = data[i];
  41        }
  42}
  43
  44static char disk_type(int d)
  45{
  46        switch (d) {
  47        case NDISKS-2:
  48                return 'P';
  49        case NDISKS-1:
  50                return 'Q';
  51        default:
  52                return 'D';
  53        }
  54}
  55
  56static int test_disks(int i, int j)
  57{
  58        int erra, errb;
  59
  60        memset(recovi, 0xf0, PAGE_SIZE);
  61        memset(recovj, 0xba, PAGE_SIZE);
  62
  63        dataptrs[i] = recovi;
  64        dataptrs[j] = recovj;
  65
  66        raid6_dual_recov(NDISKS, PAGE_SIZE, i, j, (void **)&dataptrs);
  67
  68        erra = memcmp(data[i], recovi, PAGE_SIZE);
  69        errb = memcmp(data[j], recovj, PAGE_SIZE);
  70
  71        if (i < NDISKS-2 && j == NDISKS-1) {
  72                /* We don't implement the DQ failure scenario, since it's
  73                   equivalent to a RAID-5 failure (XOR, then recompute Q) */
  74                erra = errb = 0;
  75        } else {
  76                printf("algo=%-8s  faila=%3d(%c)  failb=%3d(%c)  %s\n",
  77                       raid6_call.name,
  78                       i, disk_type(i),
  79                       j, disk_type(j),
  80                       (!erra && !errb) ? "OK" :
  81                       !erra ? "ERRB" :
  82                       !errb ? "ERRA" : "ERRAB");
  83        }
  84
  85        dataptrs[i] = data[i];
  86        dataptrs[j] = data[j];
  87
  88        return erra || errb;
  89}
  90
  91int main(int argc, char *argv[])
  92{
  93        const struct raid6_calls *const *algo;
  94        const struct raid6_recov_calls *const *ra;
  95        int i, j, p1, p2;
  96        int err = 0;
  97
  98        makedata(0, NDISKS-1);
  99
 100        for (ra = raid6_recov_algos; *ra; ra++) {
 101                if ((*ra)->valid  && !(*ra)->valid())
 102                        continue;
 103
 104                raid6_2data_recov = (*ra)->data2;
 105                raid6_datap_recov = (*ra)->datap;
 106
 107                printf("using recovery %s\n", (*ra)->name);
 108
 109                for (algo = raid6_algos; *algo; algo++) {
 110                        if ((*algo)->valid && !(*algo)->valid())
 111                                continue;
 112
 113                        raid6_call = **algo;
 114
 115                        /* Nuke syndromes */
 116                        memset(data[NDISKS-2], 0xee, 2*PAGE_SIZE);
 117
 118                        /* Generate assumed good syndrome */
 119                        raid6_call.gen_syndrome(NDISKS, PAGE_SIZE,
 120                                                (void **)&dataptrs);
 121
 122                        for (i = 0; i < NDISKS-1; i++)
 123                                for (j = i+1; j < NDISKS; j++)
 124                                        err += test_disks(i, j);
 125
 126                        if (!raid6_call.xor_syndrome)
 127                                continue;
 128
 129                        for (p1 = 0; p1 < NDISKS-2; p1++)
 130                                for (p2 = p1; p2 < NDISKS-2; p2++) {
 131
 132                                        /* Simulate rmw run */
 133                                        raid6_call.xor_syndrome(NDISKS, p1, p2, PAGE_SIZE,
 134                                                                (void **)&dataptrs);
 135                                        makedata(p1, p2);
 136                                        raid6_call.xor_syndrome(NDISKS, p1, p2, PAGE_SIZE,
 137                                                                (void **)&dataptrs);
 138
 139                                        for (i = 0; i < NDISKS-1; i++)
 140                                                for (j = i+1; j < NDISKS; j++)
 141                                                        err += test_disks(i, j);
 142                                }
 143
 144                }
 145                printf("\n");
 146        }
 147
 148        printf("\n");
 149        /* Pick the best algorithm test */
 150        raid6_select_algo();
 151
 152        if (err)
 153                printf("\n*** ERRORS FOUND ***\n");
 154
 155        return err;
 156}
 157