dm snapshot: move cow ref from exception store to snap core

[mv-sheeva.git] / drivers / md / dm-exception-store.h

diff --git a/drivers/md/dm-exception-store.h b/drivers/md/dm-exception-store.h
index 366c8b1fca37444783f2d82e2a476d8a6db1c7ab..bb8874653de188022a6685311dcd6fe348ffb962 100644 (file)
--- 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;
@@ -108,6 +108,11 @@ struct dm_exception_store {
        void *context;
 };
 
+/*
+ * Obtain the cow device used by a given snapshot.
+ */
+struct dm_dev *dm_snap_cow(struct dm_snapshot *snap);
+
 /*
  * Funtions to manipulate consecutive chunks
  */
@@ -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);