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1896. [bug] The cache could delete expired records too fast for

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clients with a virtual time in the past. [RT #14991]
This commit is contained in:
Mark Andrews
2005-07-07 00:51:05 +00:00
parent ede29aeb41
commit 2b3e34f036
2 changed files with 30 additions and 14 deletions
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3
CHANGES
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@@ -1,3 +1,6 @@
1896. [bug] The cache could delete expired records too fast for
clients with a virtual time in the past. [RT #14991]
1895. [bug] fctx_create() could return success even though it
failed. [RT #14993]

41
lib/dns/rbtdb.c
View File

@@ -15,7 +15,7 @@
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: rbtdb.c,v 1.210 2005/07/04 03:50:32 marka Exp $ */
/* $Id: rbtdb.c,v 1.211 2005/07/07 00:51:05 marka Exp $ */
/*! \file */
@@ -182,6 +182,12 @@ typedef isc_mutex_t nodelock_t;
#define NODE_WEAKUNLOCK(l, t)
#endif
/*
* Allow clients with a virtual time of upto 5 minutes in the past to see
* records that would have otherwise have expired.
*/
#define RBTDB_VIRTUAL 300
struct noqname {
dns_name_t name;
void * nsec;
@@ -2878,8 +2884,9 @@ cache_zonecut_callback(dns_rbtnode_t *node, dns_name_t *name, void *arg) {
* the node as dirty, so it will get cleaned
* up later.
*/
if (locktype == isc_rwlocktype_write ||
NODE_TRYUPGRADE(lock) == ISC_R_SUCCESS) {
if ((header->ttl <= search->now + RBTDB_VIRTUAL) &&
(locktype == isc_rwlocktype_write ||
NODE_TRYUPGRADE(lock) == ISC_R_SUCCESS)) {
/*
* We update the node's status only when we
* can get write access; otherwise, we leave
@@ -2992,8 +2999,10 @@ find_deepest_zonecut(rbtdb_search_t *search, dns_rbtnode_t *node,
* the node as dirty, so it will get cleaned
* up later.
*/
if (locktype == isc_rwlocktype_write ||
NODE_TRYUPGRADE(lock) == ISC_R_SUCCESS) {
if ((header->ttl <= search->now +
RBTDB_VIRTUAL) &&
(locktype == isc_rwlocktype_write ||
NODE_TRYUPGRADE(lock) == ISC_R_SUCCESS)) {
/*
* We update the node's status only
* when we can get write access.
@@ -3153,8 +3162,9 @@ find_coveringnsec(rbtdb_search_t *search, dns_dbnode_t **nodep,
* node as dirty, so it will get cleaned up
* later.
*/
if (locktype == isc_rwlocktype_write ||
NODE_TRYUPGRADE(lock) == ISC_R_SUCCESS) {
if ((header->ttl <= now + RBTDB_VIRTUAL) &&
(locktype == isc_rwlocktype_write ||
NODE_TRYUPGRADE(lock) == ISC_R_SUCCESS)) {
/*
* We update the node's status only
* when we can get write access.
@@ -3331,8 +3341,9 @@ cache_find(dns_db_t *db, dns_name_t *name, dns_dbversion_t *version,
* mark it as stale, and the node as dirty, so it will
* get cleaned up later.
*/
if (locktype == isc_rwlocktype_write ||
NODE_TRYUPGRADE(lock) == ISC_R_SUCCESS) {
if ((header->ttl <= now + RBTDB_VIRTUAL) &&
(locktype == isc_rwlocktype_write ||
NODE_TRYUPGRADE(lock) == ISC_R_SUCCESS)) {
/*
* We update the node's status only when we
* can get write access.
@@ -3623,8 +3634,9 @@ cache_findzonecut(dns_db_t *db, dns_name_t *name, unsigned int options,
* mark it as stale, and the node as dirty, so it will
* get cleaned up later.
*/
if (locktype == isc_rwlocktype_write ||
NODE_TRYUPGRADE(lock) == ISC_R_SUCCESS) {
if ((header->ttl <= now + RBTDB_VIRTUAL) &&
(locktype == isc_rwlocktype_write ||
NODE_TRYUPGRADE(lock) == ISC_R_SUCCESS)) {
/*
* We update the node's status only when we
* can get write access.
@@ -3837,7 +3849,7 @@ expirenode(dns_db_t *db, dns_dbnode_t *node, isc_stdtime_t now) {
isc_rwlocktype_write);
for (header = rbtnode->data; header != NULL; header = header->next)
if (header->ttl <= now) {
if (header->ttl <= now + RBTDB_VIRTUAL) {
/*
* We don't check if refcurrent(rbtnode) == 0 and try
* to free like we do in cache_find(), because
@@ -4083,8 +4095,9 @@ cache_findrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
for (header = rbtnode->data; header != NULL; header = header_next) {
header_next = header->next;
if (header->ttl <= now) {
if (locktype == isc_rwlocktype_write ||
NODE_TRYUPGRADE(lock) == ISC_R_SUCCESS) {
if ((header->ttl <= now + RBTDB_VIRTUAL) &&
(locktype == isc_rwlocktype_write ||
NODE_TRYUPGRADE(lock) == ISC_R_SUCCESS)) {
/*
* We update the node's status only when we
* can get write access.