FS_SIZE_UPPER_LIMIT
(min_fail == 0) && (cur_db_off < FS_SIZE_UPPER_LIMIT);
int64_t cut = FS_SIZE_UPPER_LIMIT/ 10; /* limit to avoid overflow */
FS_SIZE_UPPER_LIMIT);
min_fail == 0 && cur_db_off < FS_SIZE_UPPER_LIMIT;