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authorMarkus Stockhausen <stockhausen@collogia.de>2014-12-15 12:57:04 +1100
committerNeilBrown <neilb@suse.de>2015-04-22 08:00:42 +1000
commit7e92e1d7629b00578cef22b1f4c6ada726663701 (patch)
tree4aeceed85c09478c06fc3e0ff9d1bb2cfa67071a /lib
parentfe5cbc6e06c7d8b3a86f6f5491d74766bb5c2827 (diff)
downloadlinux-7e92e1d7629b00578cef22b1f4c6ada726663701.tar.gz
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>
Diffstat (limited to 'lib')
-rw-r--r--lib/raid6/test/test.c51
1 files changed, 36 insertions, 15 deletions
diff --git a/lib/raid6/test/test.c b/lib/raid6/test/test.c
index 5a485b7a7d3c..3bebbabdb510 100644
--- a/lib/raid6/test/test.c
+++ b/lib/raid6/test/test.c
@@ -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;
+
+ 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++) {
- /* Nuke syndromes */
- memset(data[NDISKS-2], 0xee, 2*PAGE_SIZE);
+ /* 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);
- /* 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);
+ }
- for (i = 0; i < NDISKS-1; i++)
- for (j = i+1; j < NDISKS; j++)
- err += test_disks(i, j);
- }
}
printf("\n");
}