dm block manager: reinstate message when validator fails

Reinstate a useful error message when the block manager buffer validator fails.
This was mistakenly eliminated when the block manager was converted to use
dm-bufio.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --git a/drivers/md/persistent-data/dm-block-manager.c b/drivers/md/persistent-data/dm-block-manager.c
index 5ba277768d9914c3dd6364f3d990feef55b67c92..47b683e67a7c51d2335421e7474fce890b6fb044 100644 (file)
--- a/drivers/md/persistent-data/dm-block-manager.c
+++ b/drivers/md/persistent-data/dm-block-manager.c
@@ -428,8 +428,11 @@ static int dm_bm_validate_buffer(struct dm_block_manager *bm,
                if (!v)
                        return 0;
                r = v->check(v, (struct dm_block *) buf, dm_bufio_get_block_size(bm->bufio));
-               if (unlikely(r))
+               if (unlikely(r)) {
+                       DMERR("%s validator check failed for block %llu", v->name,
+                             (unsigned long long) dm_bufio_get_block_number(buf));
                        return r;
+               }
                aux->validator = v;
        } else {
                if (unlikely(aux->validator != v)) {