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Switch the locknum generation for qpznode to random

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Instead of using on hash of the name modulo number of the buckets,
assign the locknum randomly with isc_random_uniform().  This makes
the locknum assignment aligned with qpcache and allows the bucket
number to be non-prime in the future.

(cherry picked from commit 732fc338a9)
This commit is contained in:
Ondřej Surý
2025-02-04 21:15:22 +01:00
parent d4e8a92977
commit db2bce1c6f
1 changed files with 3 additions and 2 deletions
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5
lib/dns/qpzone.c
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@@ -527,10 +527,11 @@ new_qpznode(qpzonedb_t *qpdb, const dns_name_t *name) {
*newdata = (qpznode_t){
.name = DNS_NAME_INITEMPTY,
.references = ISC_REFCOUNT_INITIALIZER(1),
.locknum = isc_random_uniform(qpdb->buckets_count),
};
newdata->locknum = dns_name_hash(name) % qpdb->buckets_count;
dns_name_dupwithoffsets(name, qpdb->common.mctx, &newdata->name);
isc_mem_attach(qpdb->common.mctx, &newdata->mctx);
dns_name_dupwithoffsets(name, qpdb->common.mctx, &newdata->name);
#if DNS_DB_NODETRACE
fprintf(stderr, "new_qpznode:%s:%s:%d:%p->references = 1\n", __func__,