REISER2FS_SUPER_MAGIC_STRING
|| substring (REISER2FS_SUPER_MAGIC_STRING, super.s_magic) <= 0
&& substring (REISER2FS_SUPER_MAGIC_STRING, super.s_magic) > 0
&& substring (REISER2FS_SUPER_MAGIC_STRING, super.s_magic) > 0