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md/raid6 algorithms: improve test program 

It is always helpful to have a test tool in place if we implement
new data critical algorithms. So add some test routines to the raid6
checker that can prove if the new xor_syndrome() works as expected.

Run through all permutations of start/stop pages per algorithm and
simulate a xor_syndrome() assisted rmw run. After each rmw check if
the recovery algorithm still confirms that the stripe is fine.

Signed-off-by: Markus Stockhausen <stockhausen@collogia.de>
Signed-off-by: NeilBrown <neilb@suse.de>
hifive-unleashed-5.1
Markus Stockhausen 2014-12-15 12:57:04 +11:00 committed by NeilBrown
parent fe5cbc6e06
commit 7e92e1d762
1 changed files with 36 additions and 15 deletions
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51
lib/raid6/test/test.c
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@ -28,11 +28,11 @@ char *dataptrs[NDISKS];
char data[NDISKS][PAGE_SIZE];
char recovi[PAGE_SIZE], recovj[PAGE_SIZE];
static void makedata(void)
static void makedata(int start, int stop)
{
int i, j;
for (i = 0; i < NDISKS; i++) {
for (i = start; i <= stop; i++) {
for (j = 0; j < PAGE_SIZE; j++)
data[i][j] = rand();
@ -91,34 +91,55 @@ int main(int argc, char *argv[])
{
const struct raid6_calls *const *algo;
const struct raid6_recov_calls *const *ra;
int i, j;
int i, j, p1, p2;
int err = 0;
makedata();
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()) {
raid6_call = **algo;
if ((*algo)->valid && !(*algo)->valid())
continue;
/* Nuke syndromes */
memset(data[NDISKS-2], 0xee, 2*PAGE_SIZE);
raid6_call = **algo;
/* Generate assumed good syndrome */
raid6_call.gen_syndrome(NDISKS, PAGE_SIZE,
(void **)&dataptrs);
/* 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);
}
for (i = 0; i < NDISKS-1; i++)
for (j = i+1; j < NDISKS; j++)
err += test_disks(i, j);
}
}
printf("\n");
}