diff --git a/space_map_disk.cc b/space_map_disk.cc
index 287a97c..a8090a7 100644
--- a/space_map_disk.cc
+++ b/space_map_disk.cc
@@ -5,6 +5,7 @@
 #include "math_utils.h"
 #include "space_map_disk_structures.h"
 #include "space_map_recursive.h"
+#include "space_map_transactional.h"
 #include "transaction_manager.h"
 
 using namespace boost;
@@ -661,6 +662,7 @@ persistent_data::create_disk_sm(transaction_manager::ptr tm,
 	index_store::ptr store(new btree_index_store(tm));
 	checked_space_map::ptr sm(new sm_disk(store, tm));
 	sm->extend(nr_blocks);
+	sm->commit();
 	return sm;
 }
 
@@ -682,7 +684,9 @@ persistent_data::create_metadata_sm(transaction_manager::ptr tm, block_address n
 	index_store::ptr store(new metadata_index_store(tm));
 	checked_space_map::ptr sm(new sm_disk(store, tm));
 	sm->extend(nr_blocks);
-	return create_recursive_sm(sm);
+	sm->commit();
+	return create_transactional_sm(
+		create_recursive_sm(sm));
 }
 
 checked_space_map::ptr
@@ -695,7 +699,9 @@ persistent_data::open_metadata_sm(transaction_manager::ptr tm, void *root)
 	sm_root_traits::unpack(d, v);
 	block_address nr_indexes = div_up<block_address>(v.nr_blocks_, ENTRIES_PER_BLOCK);
 	index_store::ptr store(new metadata_index_store(tm, v.bitmap_root_, nr_indexes));
-	return create_recursive_sm(checked_space_map::ptr(new sm_disk(store, tm, v)));
+	return create_transactional_sm(
+		create_recursive_sm(
+			checked_space_map::ptr(new sm_disk(store, tm, v))));
 }
 
 //----------------------------------------------------------------
diff --git a/space_map_transactional.cc b/space_map_transactional.cc
index dfbec48..cdf5a4f 100644
--- a/space_map_transactional.cc
+++ b/space_map_transactional.cc
@@ -55,7 +55,7 @@ namespace {
 			if (end <= search_start_)
 				return maybe_block();
 
-			maybe_block mb = sm_->new_block(max(search_start_, begin), end);
+			maybe_block mb = committed_->new_block(max(search_start_, begin), end);
 			if (mb) {
 				allocated_++;
 				search_start_ = *mb + 1;
@@ -73,6 +73,10 @@ namespace {
 			return sm_->extend(extra_blocks);
 		}
 
+		virtual void iterate(iterator &it) const {
+			sm_->iterate(it);
+		}
+
 		virtual size_t root_size() const {
 			return sm_->root_size();
 		}
@@ -81,6 +85,10 @@ namespace {
 			return sm_->copy_root(dest, len);
 		}
 
+		virtual void check(block_counter &counter) const {
+			return sm_->check(counter);
+		}
+
 		virtual checked_space_map::ptr clone() const {
 			return checked_space_map::ptr(new sm_transactional(sm_));
 		}
@@ -93,4 +101,13 @@ namespace {
 	};
 }
 
+//----------------------------------------------------------------
+
+checked_space_map::ptr
+persistent_data::create_transactional_sm(checked_space_map::ptr sm)
+{
+	return checked_space_map::ptr(new sm_transactional(sm));
+}
+
+
 //----------------------------------------------------------------