HAMMER2_FREEMAP_SIZEDIV
if (size > hmp->total_size / HAMMER2_FREEMAP_SIZEDIV)
size = howmany(hmp->total_size, HAMMER2_FREEMAP_SIZEDIV);
if (size > hmp->total_size / HAMMER2_FREEMAP_SIZEDIV)
size = howmany(hmp->total_size, HAMMER2_FREEMAP_SIZEDIV);