EXT_INIT_MAX_LEN
return (le16toh(ext->e_len) <= EXT_INIT_MAX_LEN ?
le16toh(ext->e_len) : (le16toh(ext->e_len) - EXT_INIT_MAX_LEN));
#define EXT4_MAX_LEN (EXT_INIT_MAX_LEN - 1)