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Add new raid_check() and raid_scan() functions

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They are aimed to find the broken blocks using the extra
redundancy information.
This commit is contained in:
Andrea Mazzoleni 2015-03-21 17:03:55 +01:00
parent b0891290eb
commit 7bdee2c1d9
4 changed files with 130 additions and 2 deletions
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60
raid/module.c
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@ -259,6 +259,49 @@ static int raid_test_rec_dataonly(int nr, int *id, int *ip, int nd, int np, size
return 0;
}
/*
* Scan test.
*/
static int raid_test_scan(int nr, int *ir, int nd, int np, size_t size, void **v, void **ref)
{
int i, j, ret;
void *t[TEST_COUNT + RAID_PARITY_MAX];
int is[RAID_PARITY_MAX];
/* setup data and parity vector */
for (i = 0, j = 0; i < nd + np; ++i) {
if (j < nr && ir[j] == i) {
/* this block is bad */
t[i] = v[i];
++j;
/* make it really bad */
memset(t[i], i, size);
} else {
/* this block is used for recovering */
t[i] = ref[i];
}
}
ret = raid_scan(is, nd, np, size, t);
/* compare identified bad blocks */
if (ret != nr) {
/* LCOV_EXCL_START */
return -1;
/* LCOV_EXCL_STOP */
}
for (i = 0; i < nr; ++i) {
if (ir[i] != is[i]) {
/* LCOV_EXCL_START */
return -1;
/* LCOV_EXCL_STOP */
}
}
return 0;
}
/*
* Basic functionality self test.
*/
@ -385,6 +428,23 @@ int raid_selftest(void)
goto bail;
/* LCOV_EXCL_STOP */
}
/* scan test with broken data and parity */
for (i = 0; i < np / 2; ++i) {
/* bad data */
ir[i] = i;
}
for (i = 0; i < (np - 1) / 2; ++i) {
/* bad parity */
ir[np / 2 + i] = nd + i;
}
ret = raid_test_scan(np - 1, ir, nd, np, size, v, ref);
if (ret != 0) {
/* LCOV_EXCL_START */
goto bail;
/* LCOV_EXCL_STOP */
}
}
bail: