#define E2F_OPT_UNSHARE_BLOCKS 0x40000
#define E2F_OPT_CLEAR_UNINIT 0x80000 /* Hack to clear the uninit bit */
#define E2F_OPT_CHECK_ENCODING 0x100000 /* Force verification of encoded filenames */
+#define E2F_OPT_MULTITHREAD 0x200000 /* Use multiple threads to speedup */
/*
* E2fsck flags