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/* -*- linux-c -*- ------------------------------------------------------- *
*
* Copyright 2002 H. Peter Anvin - All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, Inc., 53 Temple Place Ste 330,
* Bostom MA 02111-1307, USA; either version 2 of the License, 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 "raid6.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];
void makedata(void)
{
int i, j;
for ( i = 0 ; i < NDISKS ; i++ ) {
for ( j = 0 ; j < PAGE_SIZE ; j++ ) {
data[i][j] = rand();
}
dataptrs[i] = data[i];
}
}
int main(int argc, char *argv[])
{
const struct raid6_calls * const * algo;
int i, j;
int erra, errb;
makedata();
for ( algo = raid6_algos ; *algo ; algo++ ) {
if ( !(*algo)->valid || (*algo)->valid() ) {
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++ ) {
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) */
} else {
printf("algo=%-8s faila=%3d(%c) failb=%3d(%c) %s\n",
raid6_call.name,
i, (i==NDISKS-2)?'P':'D',
j, (j==NDISKS-1)?'Q':(j==NDISKS-2)?'P':'D',
(!erra && !errb) ? "OK" :
!erra ? "ERRB" :
!errb ? "ERRA" :
"ERRAB");
}
dataptrs[i] = data[i];
dataptrs[j] = data[j];
}
}
}
printf("\n");
}
printf("\n");
/* Pick the best algorithm test */
raid6_select_algo();
return 0;
}
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