GOLDEN_RATIO_PRIME
u64 h = objectid ^ (root->root_key.objectid * GOLDEN_RATIO_PRIME);
tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME + hashval) /
tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> i_hash_shift);
tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME + hashval) /
tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> inode_hash_shift);
#define libeth_xsktmo ((const void *)GOLDEN_RATIO_PRIME)