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Commit 3f2e5393 authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Mike Snitzer
Browse files

dm integrity: count and display checksum failures 



This changes DM integrity to count the number of checksum failures and
report the counter in response to STATUSTYPE_INFO request (via 'dmsetup
status').

Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent 1e3b21c6

drivers/md/dm-integrity.c

+8 −2
Original line number Diff line number Diff line
@@ -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_target *ti); 


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 @@ static void integrity_metadata(struct work_struct *w) 
					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);
@@ -2230,7 +2235,7 @@ static void dm_integrity_status(struct dm_target *ti, status_type_t type, 


	switch (type) {

	case STATUSTYPE_INFO:

		result[0] = '\0';

		DMEMIT("%llu", (unsigned long long)atomic64_read(&ic->number_of_mismatches));

		break;



	case STATUSTYPE_TABLE: {
@@ -2803,6 +2808,7 @@ static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv) 
	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) {
@@ -3199,7 +3205,7 @@ static void dm_integrity_dtr(struct dm_target *ti) 


static struct target_type integrity_target = {

	.name			= "integrity",

	.version		= {1, 0, 0},

	.version		= {1, 1, 0},

	.module			= THIS_MODULE,

	.features		= DM_TARGET_SINGLETON | DM_TARGET_INTEGRITY,

	.ctr			= dm_integrity_ctr,