UDF_EXT_MAXLEN
assert(inf_len < UDF_EXT_MAXLEN);
max_len = UDF_EXT_MAXLEN / context.sector_size; /* in sectors */
max_len = ((UDF_EXT_MAXLEN / lb_size) * lb_size);
max_len = ((UDF_EXT_MAXLEN / unit_size) * unit_size);
max_len = ((UDF_EXT_MAXLEN / unit_size) * unit_size);
uint64_t max_len = UDF_ROUNDDOWN(UDF_EXT_MAXLEN, sector_size);