This is a patch to count errors in dm-integrity - as Jon suggested.
This patch changes dm-integrity so that it counts the number of checksum
failures and reports the counter in the status line.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
---
drivers/md/dm-integrity.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
Index: linux-2.6/drivers/md/dm-integrity.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-integrity.c
+++ linux-2.6/drivers/md/dm-integrity.c
@@ -225,6 +225,8 @@ struct dm_integrity_c {
struct alg_spec internal_hash_alg;
struct alg_spec journal_crypt_alg;
struct alg_spec journal_mac_alg;
+
+ atomic64_t number_of_mismatches;
};
struct dm_integrity_range {
@@ -309,6 +311,8 @@ static void dm_integrity_dtr(struct dm_t
static void dm_integrity_io_error(struct dm_integrity_c *ic, const char *msg, int err)
{
+ if (err == -EILSEQ)
+ atomic64_inc(&ic->number_of_mismatches);
if (!cmpxchg(&ic->failed, 0, err))
DMERR("Error on %s: %d", msg, err);
}
@@ -1273,6 +1277,7 @@ again:
DMERR("Checksum failed at sector 0x%llx",
(unsigned long long)(sector - ((r + ic->tag_size - 1) / ic->tag_size)));
r = -EILSEQ;
+ atomic64_inc(&ic->number_of_mismatches);
}
if (likely(checksums != checksums_onstack))
kfree(checksums);
@@ -2222,7 +2227,7 @@ static void dm_integrity_status(struct d
switch (type) {
case STATUSTYPE_INFO:
- result[0] = '\0';
+ DMEMIT("%llu", (unsigned long long)atomic64_read(&ic->number_of_mismatches));
break;
case STATUSTYPE_TABLE: {
@@ -2795,6 +2800,7 @@ static int dm_integrity_ctr(struct dm_ta
bio_list_init(&ic->flush_bio_list);
init_waitqueue_head(&ic->copy_to_journal_wait);
init_completion(&ic->crypto_backoff);
+ atomic64_set(&ic->number_of_mismatches, 0);
r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &ic->dev);
if (r) {
--
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