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Subject[PATCH 5.0 179/238] dm integrity: limit the rate of error messages
Date
5.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mikulas Patocka <mpatocka@redhat.com>

commit 225557446856448039a9e495da37b72c20071ef2 upstream.

When using dm-integrity underneath md-raid, some tests with raid
auto-correction trigger large amounts of integrity failures - and all
these failures print an error message. These messages can bring the
system to a halt if the system is using serial console.

Fix this by limiting the rate of error messages - it improves the speed
of raid recovery and avoids the hang.

Fixes: 7eada909bfd7a ("dm: add integrity target")
Cc: stable@vger.kernel.org # v4.12+
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/md/dm-integrity.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -1368,8 +1368,8 @@ again:
checksums_ptr - checksums, !dio->write ? TAG_CMP : TAG_WRITE);
if (unlikely(r)) {
if (r > 0) {
- DMERR("Checksum failed at sector 0x%llx",
- (unsigned long long)(sector - ((r + ic->tag_size - 1) / ic->tag_size)));
+ DMERR_LIMIT("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);
}
@@ -1561,8 +1561,8 @@ retry_kmap:

integrity_sector_checksum(ic, logical_sector, mem + bv.bv_offset, checksums_onstack);
if (unlikely(memcmp(checksums_onstack, journal_entry_tag(ic, je), ic->tag_size))) {
- DMERR("Checksum failed when reading from journal, at sector 0x%llx",
- (unsigned long long)logical_sector);
+ DMERR_LIMIT("Checksum failed when reading from journal, at sector 0x%llx",
+ (unsigned long long)logical_sector);
}
}
#endif

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