diff --git a/headers/private/kernel/disk_device_manager/ddm_userland_interface.h b/headers/private/kernel/disk_device_manager/ddm_userland_interface.h
index 784d15230a..35a144b27e 100644
--- a/headers/private/kernel/disk_device_manager/ddm_userland_interface.h
+++ b/headers/private/kernel/disk_device_manager/ddm_userland_interface.h
@@ -145,26 +145,29 @@ status_t _kern_commit_disk_device_modifications(partition_id deviceID,
 status_t _kern_cancel_disk_device_modifications(partition_id deviceID);
 bool _kern_is_disk_device_modified(partition_id deviceID);
 
-#if 0
+status_t _kern_defragment_partition(partition_id partition);
+status_t _kern_repair_partition(partition_id partition, bool checkOnly);
+status_t _kern_resize_partition(partition_id partition, off_t size,
+								bool resizeContents);
+status_t _kern_move_partition(partition_id partition, off_t newOffset,
+							  bool force);
+status_t _kern_set_partition_name(partition_id partition, const char *name);
+status_t _kern_set_partition_content_name(partition_id partition,
+										  const char *name);
+status_t _kern_set_partition_type(partition_id partition, const char *type);
+status_t _kern_set_partition_parameters(partition_id partition,
+										const char *parameters);
+status_t _kern_set_partition_content_parameters(partition_id partition,
+												const char *parameters);
+status_t _kern_initialize_partition(partition_id partition,
+									const char *diskSystem, const char *name,
+									const char *parameters);
+status_t _kern_create_child_partition(partition_id partition, off_t offset,
+								off_t size, const char *type,
+								const char *parameters, partition_id *child);
+status_t _kern_delete_partition(partition_id partition);
 
-status_t defragment_partition(partition_id partition);
-status_t repair_partition(partition_id partition, bool checkOnly);
-status_t resize_partition(partition_id partition, off_t size);
-status_t move_partition(partition_id partition, off_t offset);
-status_t set_partition_parameters(partition_id partition,
-								  const char *parameters,
-								  const char *contentParameters);
-status_t initialize_partition(partition_id partition, const char *diskSystem,
-							  const char *parameters);
-	// Note: There is also fs_initialize_volume(), which is not compatible
-	// with this function, for it is more general with respect to how the
-	// volume to be initialized is specified (though this might be solved
-	// by providing an API for registering files as disk devices), and more
-	// specific regarding the other parameters (flags and volumeName).
-status_t create_child_partition(partition_id partition, off_t offset,
-								off_t size, const char *parameters,
-								partition_id *child);
-status_t delete_partition(partition_id partition);
+#if 0
 
 // jobs
 status_t get_next_disk_device_job_info(user_disk_device_job_info *info,
diff --git a/src/kernel/core/disk_device_manager/ddm_userland_interface.cpp b/src/kernel/core/disk_device_manager/ddm_userland_interface.cpp
index d16a2ba04e..06c400fe91 100644
--- a/src/kernel/core/disk_device_manager/ddm_userland_interface.cpp
+++ b/src/kernel/core/disk_device_manager/ddm_userland_interface.cpp
@@ -696,6 +696,8 @@ _kern_validate_move_partition(partition_id partitionID, off_t *newOffset,
 status_t
 _kern_validate_set_partition_name(partition_id partitionID, char *name)
 {
+	if (!name)
+		return B_BAD_VALUE;
 	KDiskDeviceManager *manager = KDiskDeviceManager::Default();
 	// get the partition
 	KPartition *partition = manager->ReadLockPartition(partitionID);
@@ -720,6 +722,8 @@ _kern_validate_set_partition_name(partition_id partitionID, char *name)
 status_t
 _kern_validate_set_partition_content_name(partition_id partitionID, char *name)
 {
+	if (!name)
+		return B_BAD_VALUE;
 	KDiskDeviceManager *manager = KDiskDeviceManager::Default();
 	// get the partition
 	KPartition *partition = manager->ReadLockPartition(partitionID);
@@ -772,7 +776,7 @@ _kern_validate_initialize_partition(partition_id partitionID,
 									const char *diskSystemName, char *name,
 									const char *parameters)
 {
-	if (!diskSystemName)
+	if (!diskSystemName || !name)
 		return B_BAD_VALUE;
 	KDiskDeviceManager *manager = KDiskDeviceManager::Default();
 	// get the partition
@@ -922,3 +926,103 @@ _kern_is_disk_device_modified(partition_id device)
 	return false;
 }
 
+// _kern_defragment_partition
+status_t
+_kern_defragment_partition(partition_id partition)
+{
+	// not implemented
+	return B_ERROR;
+}
+
+// _kern_repair_partition
+status_t
+_kern_repair_partition(partition_id partition, bool checkOnly)
+{
+	// not implemented
+	return B_ERROR;
+}
+
+// _kern_resize_partition
+status_t
+_kern_resize_partition(partition_id partition, off_t size, bool resizeContents)
+{
+	// not implemented
+	return B_ERROR;
+}
+
+// _kern_move_partition
+status_t
+_kern_move_partition(partition_id partition, off_t newOffset, bool force)
+{
+	// not implemented
+	return B_ERROR;
+}
+
+// _kern_set_partition_name
+status_t
+_kern_set_partition_name(partition_id partition, const char *name)
+{
+	// not implemented
+	return B_ERROR;
+}
+
+// _kern_set_partition_content_name
+status_t
+_kern_set_partition_content_name(partition_id partition, const char *name)
+{
+	// not implemented
+	return B_ERROR;
+}
+
+// _kern_set_partition_type
+status_t
+_kern_set_partition_type(partition_id partition, const char *type)
+{
+	// not implemented
+	return B_ERROR;
+}
+
+// _kern_set_partition_parameters
+status_t
+_kern_set_partition_parameters(partition_id partition, const char *parameters)
+{
+	// not implemented
+	return B_ERROR;
+}
+
+// _kern_set_partition_content_parameters
+status_t
+_kern_set_partition_content_parameters(partition_id partition,
+									   const char *parameters)
+{
+	// not implemented
+	return B_ERROR;
+}
+
+// _kern_initialize_partition
+status_t
+_kern_initialize_partition(partition_id partition, const char *diskSystem,
+						   const char *name, const char *parameters)
+{
+	// not implemented
+	return B_ERROR;
+}
+
+// _kern_create_child_partition
+status_t
+_kern_create_child_partition(partition_id partition, off_t offset, off_t size,
+							 const char *type, const char *parameters,
+							 partition_id *child)
+{
+	// not implemented
+	return B_ERROR;
+}
+
+// _kern_delete_partition
+status_t
+_kern_delete_partition(partition_id partition)
+{
+	// not implemented
+	return B_ERROR;
+}
+