dm exception store: move dm_target pointer

Move target pointer from snapshot to exception store.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
diff --git a/drivers/md/dm-exception-store.h b/drivers/md/dm-exception-store.h
index 3137715..4b7f7d4 100644
--- a/drivers/md/dm-exception-store.h
+++ b/drivers/md/dm-exception-store.h
@@ -95,6 +95,7 @@
 
 struct dm_exception_store {
 	struct dm_exception_store_type *type;
+	struct dm_target *ti;
 
 	struct dm_snapshot *snap;
 
@@ -147,7 +148,7 @@
 int dm_exception_store_type_register(struct dm_exception_store_type *type);
 int dm_exception_store_type_unregister(struct dm_exception_store_type *type);
 
-int dm_exception_store_create(const char *type_name,
+int dm_exception_store_create(const char *type_name, struct dm_target *ti,
 			      struct dm_exception_store **store);
 void dm_exception_store_destroy(struct dm_exception_store *store);