Added helper for backing info

src/backing.c

@@ -419,3 +419,28 @@ result_t get_backing_parent(char** _parent, const char* backing) {
 	*_parent = parent;
 	return success();
 }
+
+result_t get_backing_info(disk_info_t* _info, const char* backing) {
+	// Initialize the output parameters
+	_info->size = 0;
+	_info->allocated = 0;
+	_info->backing_path = NULL;
+
+	// Check that the backing exists
+	result_t result = check_backing_exists(backing);
+	if (result != success())
+		return result;
+
+	// Get the backing path
+	char* path;
+	result = get_backing_path(&path, backing);
+	if (result != success())
+		return result;
+
+	// Get the disk information
+	result = get_disk_info(_info, path);
+
+	free(path);
+
+	return result;
+}