+ char *p, *type_name_dup;
+ struct dm_dirty_log_internal *log_type;
+
+ if (!type_name)
+ return NULL;
+
+ log_type = _get_dirty_log_type(type_name);
+ if (log_type)
+ return log_type->type;
+
+ type_name_dup = kstrdup(type_name, GFP_KERNEL);
+ if (!type_name_dup) {
+ DMWARN("No memory left to attempt log module load for \"%s\"",
+ type_name);
+ return NULL;
+ }
+
+ while (request_module("dm-log-%s", type_name_dup) ||
+ !(log_type = _get_dirty_log_type(type_name))) {
+ p = strrchr(type_name_dup, '-');
+ if (!p)
+ break;
+ p[0] = '\0';
+ }
+
+ if (!log_type)
+ DMWARN("Module for logging type \"%s\" not found.", type_name);
+
+ kfree(type_name_dup);
+
+ return log_type ? log_type->type : NULL;
+}
+
+static void put_type(struct dm_dirty_log_type *type)
+{
+ struct dm_dirty_log_internal *log_type;
+
+ if (!type)
+ return;
+