dm cache metadata: name the cache block that couldn't be loaded

Improves __load_mapping_v1() and __load_mapping_v2() DMERR messages to
explicitly name the cache block number whose mapping couldn't be
loaded.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-cache-metadata.c b/drivers/md/dm-cache-metadata.c
index 0610be7..5a5ef99 100644 (file)
--- a/drivers/md/dm-cache-metadata.c
+++ b/drivers/md/dm-cache-metadata.c
@@ -1316,8 +1316,10 @@ static int __load_mapping_v1(struct dm_cache_metadata *cmd,
 
                r = fn(context, oblock, to_cblock(cb), flags & M_DIRTY,
                       le32_to_cpu(hint), hints_valid);
-               if (r)
-                       DMERR("policy couldn't load cblock");
+               if (r) {
+                       DMERR("policy couldn't load cache block %llu",
+                             (unsigned long long) from_cblock(to_cblock(cb)));
+               }
        }
 
        return r;
@@ -1355,8 +1357,10 @@ static int __load_mapping_v2(struct dm_cache_metadata *cmd,
                dirty = dm_bitset_cursor_get_value(dirty_cursor);
                r = fn(context, oblock, to_cblock(cb), dirty,
                       le32_to_cpu(hint), hints_valid);
-               if (r)
-                       DMERR("policy couldn't load cblock");
+               if (r) {
+                       DMERR("policy couldn't load cache block %llu",
+                             (unsigned long long) from_cblock(to_cblock(cb)));
+               }
        }
 
        return r;