1 files changed, 9 insertions, 3 deletions

diff --git a/drivers/md/dm-exception-store.h b/drivers/md/dm-exception-store.h
index 366c8b1fca37..bb8874653de1 100644
--- a/drivers/md/dm-exception-store.h
+++ b/drivers/md/dm-exception-store.h
@@ -94,11 +94,11 @@ struct dm_exception_store_type {
         struct list_head list;
 };
 
+struct dm_snapshot;
+
 struct dm_exception_store {
         struct dm_exception_store_type *type;
-        struct dm_target *ti;
-
-        struct dm_dev *cow;
+        struct dm_snapshot *snap;
 
         /* Size of data blocks saved - must be a power of 2 */
         unsigned chunk_size;
@@ -109,6 +109,11 @@ struct dm_exception_store {
 };
 
 /*
+ * Obtain the cow device used by a given snapshot.
+ */
+struct dm_dev *dm_snap_cow(struct dm_snapshot *snap);
+
+/*
  * Funtions to manipulate consecutive chunks
  */
 #  if defined(CONFIG_LBDAF) || (BITS_PER_LONG == 64)
@@ -173,6 +178,7 @@ int dm_exception_store_set_chunk_size(struct dm_exception_store *store,
                                       char **error);
 
 int dm_exception_store_create(struct dm_target *ti, int argc, char **argv,
+                              struct dm_snapshot *snap,
                               unsigned *args_used,
                               struct dm_exception_store **store);
 void dm_exception_store_destroy(struct dm_exception_store *store);