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-rw-r--r--drivers/md/dm-cache-policy.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/md/dm-cache-policy.h b/drivers/md/dm-cache-policy.h
index 052c00a84a5c..f50fe360c546 100644
--- a/drivers/md/dm-cache-policy.h
+++ b/drivers/md/dm-cache-policy.h
@@ -223,6 +223,12 @@ struct dm_cache_policy_type {
unsigned version[CACHE_POLICY_VERSION_SIZE];
/*
+ * For use by an alias dm_cache_policy_type to point to the
+ * real dm_cache_policy_type.
+ */
+ struct dm_cache_policy_type *real;
+
+ /*
* Policies may store a hint for each each cache block.
* Currently the size of this hint must be 0 or 4 bytes but we
* expect to relax this in future.
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