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Diffstat (limited to 'kernel/lib/raid6/test/test.c')
| -rw-r--r-- | kernel/lib/raid6/test/test.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/kernel/lib/raid6/test/test.c b/kernel/lib/raid6/test/test.c new file mode 100644 index 000000000..3bebbabdb --- /dev/null +++ b/kernel/lib/raid6/test/test.c @@ -0,0 +1,155 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright 2002-2007 H. Peter Anvin - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2 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 <linux/raid/pq.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]; + +static void makedata(int start, int stop) +{ + int i, j; + + for (i = start; i <= stop; i++) { + for (j = 0; j < PAGE_SIZE; j++) + data[i][j] = rand(); + + dataptrs[i] = data[i]; + } +} + +static char disk_type(int d) +{ + switch (d) { + case NDISKS-2: + return 'P'; + case NDISKS-1: + return 'Q'; + default: + return 'D'; + } +} + +static int test_disks(int i, int j) +{ + int erra, errb; + + 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) */ + erra = errb = 0; + } else { + printf("algo=%-8s faila=%3d(%c) failb=%3d(%c) %s\n", + raid6_call.name, + i, disk_type(i), + j, disk_type(j), + (!erra && !errb) ? "OK" : + !erra ? "ERRB" : + !errb ? "ERRA" : "ERRAB"); + } + + dataptrs[i] = data[i]; + dataptrs[j] = data[j]; + + return erra || errb; +} + +int main(int argc, char *argv[]) +{ + const struct raid6_calls *const *algo; + const struct raid6_recov_calls *const *ra; + int i, j, p1, p2; + int err = 0; + + makedata(0, NDISKS-1); + + for (ra = raid6_recov_algos; *ra; ra++) { + if ((*ra)->valid && !(*ra)->valid()) + continue; + + raid6_2data_recov = (*ra)->data2; + raid6_datap_recov = (*ra)->datap; + + printf("using recovery %s\n", (*ra)->name); + + for (algo = raid6_algos; *algo; algo++) { + if ((*algo)->valid && !(*algo)->valid()) + continue; + + 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++) + err += test_disks(i, j); + + if (!raid6_call.xor_syndrome) + continue; + + for (p1 = 0; p1 < NDISKS-2; p1++) + for (p2 = p1; p2 < NDISKS-2; p2++) { + + /* Simulate rmw run */ + raid6_call.xor_syndrome(NDISKS, p1, p2, PAGE_SIZE, + (void **)&dataptrs); + makedata(p1, p2); + raid6_call.xor_syndrome(NDISKS, p1, p2, PAGE_SIZE, + (void **)&dataptrs); + + for (i = 0; i < NDISKS-1; i++) + for (j = i+1; j < NDISKS; j++) + err += test_disks(i, j); + } + + } + printf("\n"); + } + + printf("\n"); + /* Pick the best algorithm test */ + raid6_select_algo(); + + if (err) + printf("\n*** ERRORS FOUND ***\n"); + + return err; +} |