dm exception store: move cow pointer

Move COW device from snapshot to exception store.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/md/dm-exception-store.h b/drivers/md/dm-exception-store.h
index 449a1e48f7aa..4dbf3577408e 100644
--- a/drivers/md/dm-exception-store.h
+++ b/drivers/md/dm-exception-store.h
@@ -99,6 +99,8 @@ struct dm_exception_store {
 
         struct dm_snapshot *snap;
 
+        struct dm_dev *cow;
+
         /* Size of data blocks saved - must be a power of 2 */
         chunk_t chunk_size;
         chunk_t chunk_mask;
@@ -155,7 +157,7 @@ int dm_exception_store_type_unregister(struct dm_exception_store_type *type);
 
 int dm_exception_store_create(const char *type_name, struct dm_target *ti,
                               chunk_t chunk_size, chunk_t chunk_mask,
-                              chunk_t chunk_shift,
+                              chunk_t chunk_shift, struct dm_dev *cow,
                               struct dm_exception_store **store);
 void dm_exception_store_destroy(struct dm_exception_store *store);