dm exception store: separate type from instance

Introduce struct dm_exception_store_type.

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

1 files changed, 7 insertions, 6 deletions

diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c
index 936b34e0959f..0bbbe3b7431e 100644
--- a/drivers/md/dm-snap-persistent.c
+++ b/drivers/md/dm-snap-persistent.c
@@ -683,12 +683,13 @@ int dm_create_persistent(struct dm_exception_store *store)
                 return -ENOMEM;
         }
 
-        store->destroy = persistent_destroy;
-        store->read_metadata = persistent_read_metadata;
-        store->prepare_exception = persistent_prepare_exception;
-        store->commit_exception = persistent_commit_exception;
-        store->drop_snapshot = persistent_drop_snapshot;
-        store->fraction_full = persistent_fraction_full;
+        store->type.dtr = persistent_destroy;
+        store->type.read_metadata = persistent_read_metadata;
+        store->type.prepare_exception = persistent_prepare_exception;
+        store->type.commit_exception = persistent_commit_exception;
+        store->type.drop_snapshot = persistent_drop_snapshot;
+        store->type.fraction_full = persistent_fraction_full;
+
         store->context = ps;
 
         return 0;