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Allow resetting hash table size limits for DNS DBs

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When "max-cache-size" is changed to "unlimited" (or "0") for a running
named instance (using "rndc reconfig"), the hash table size limit for
each affected cache DB is not reset to the maximum possible value,
preventing those hash tables from being allowed to grow as a result of
new nodes being added.

Extend dns_rbt_adjusthashsize() to interpret "size" set to 0 as a signal
to remove any previously imposed limits on the hash table size.  Adjust
API documentation for dns_db_adjusthashsize() accordingly.  Move the
call to dns_db_adjusthashsize() from dns_cache_setcachesize() so that it
also happens when "size" is set to 0.
This commit is contained in:
Michał Kępień
2021-06-17 17:09:37 +02:00
parent c096f91451
commit 6b77583f54
3 changed files with 29 additions and 10 deletions
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3
lib/dns/cache.c
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@@ -957,8 +957,9 @@ dns_cache_setcachesize(dns_cache_t *cache, size_t size) {
* time, or replacing other limits).
*/
isc_mem_setwater(cache->mctx, water, cache, hiwater, lowater);
dns_db_adjusthashsize(cache->db, size);
}
dns_db_adjusthashsize(cache->db, size);
}
size_t