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.c b/drivers/md/dm-exception-store.c
index 8912a36..fe0cfa6 100644
--- a/drivers/md/dm-exception-store.c
+++ b/drivers/md/dm-exception-store.c
@@ -137,7 +137,7 @@
 }
 EXPORT_SYMBOL(dm_exception_store_type_unregister);
 
-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)
 {
 	int r = 0;
@@ -155,6 +155,7 @@
 	}
 
 	tmp_store->type = type;
+	tmp_store->ti = ti;
 
 	r = type->ctr(tmp_store, 0, NULL);
 	if (r) {