struct dm_btree_value_type *vt);
int new_block(struct dm_btree_info *info, struct dm_block **result);
-int unlock_block(struct dm_btree_info *info, struct dm_block *b);
+void unlock_block(struct dm_btree_info *info, struct dm_block *b);
/*
* Spines keep track of the rolling locks. There are 2 variants, read-only