static void
zt_flushanddetach(dns_zt_t **ztp, isc_boolean_t need_flush) {
isc_boolean_t destroy = ISC_FALSE;
dns_zt_t *zt;
REQUIRE(ztp != NULL && VALID_ZT(*ztp));
zt = *ztp;
RWLOCK(&zt->rwlock, isc_rwlocktype_write);
INSIST(zt->references > 0);
zt->references--;
if (zt->references == 0)
destroy = ISC_TRUE;
RWUNLOCK(&zt->rwlock, isc_rwlocktype_write);
if (destroy) {
if (need_flush)
(void)dns_zt_apply(zt, ISC_FALSE, flush, NULL);
dns_rbt_destroy(&zt->table);
isc_rwlock_destroy(&zt->rwlock);
zt->magic = 0;
isc_mem_put(zt->mctx, zt, sizeof(*zt));
}
*ztp = NULL;
}
/*
* Decrement the loads_pending counter; when counter reaches
* zero, call the loaddone callback that was initially set by
* dns_zt_asyncload().
*/
static isc_result_t
doneloading(dns_zt_t *zt, dns_zone_t *zone, isc_task_t *task) {
isc_boolean_t destroy = ISC_FALSE;
dns_zt_allloaded_t alldone = NULL;
void *arg = NULL;
UNUSED(zone);
UNUSED(task);
REQUIRE(VALID_ZT(zt));
RWLOCK(&zt->rwlock, isc_rwlocktype_write);
INSIST(zt->loads_pending != 0);
INSIST(zt->references != 0);
zt->references--;
if (zt->references == 0)
destroy = ISC_TRUE;
zt->loads_pending--;
if (zt->loads_pending == 0) {
alldone = zt->loaddone;
arg = zt->loaddone_arg;
zt->loaddone = NULL;
zt->loaddone_arg = NULL;
}
RWUNLOCK(&zt->rwlock, isc_rwlocktype_write);
if (alldone != NULL)
alldone(arg);
if (destroy)
zt_destroy(zt);
return (ISC_R_SUCCESS);
}
isc_result_t
dns_zt_asyncload(dns_zt_t *zt, dns_zt_allloaded_t alldone, void *arg) {
isc_result_t result;
static dns_zt_zoneloaded_t dl = doneloading;
int pending;
REQUIRE(VALID_ZT(zt));
RWLOCK(&zt->rwlock, isc_rwlocktype_write);
INSIST(zt->loads_pending == 0);
result = dns_zt_apply2(zt, ISC_FALSE, NULL, asyncload, &dl);
pending = zt->loads_pending;
if (pending != 0) {
zt->loaddone = alldone;
zt->loaddone_arg = arg;
}
RWUNLOCK(&zt->rwlock, isc_rwlocktype_write);
if (pending == 0)
alldone(arg);
return (result);
}
static void
zt_flushanddetach(dns_zt_t **ztp, isc_boolean_t need_flush) {
isc_boolean_t destroy = ISC_FALSE;
dns_zt_t *zt;
REQUIRE(ztp != NULL && VALID_ZT(*ztp));
zt = *ztp;
RWLOCK(&zt->rwlock, isc_rwlocktype_write);
INSIST(zt->references > 0);
zt->references--;
if (zt->references == 0)
destroy = ISC_TRUE;
if (need_flush)
zt->flush = ISC_TRUE;
RWUNLOCK(&zt->rwlock, isc_rwlocktype_write);
if (destroy)
zt_destroy(zt);
*ztp = NULL;
}
isc_result_t
dns_zt_freezezones(dns_zt_t *zt, isc_boolean_t freeze) {
isc_result_t result, tresult;
REQUIRE(VALID_ZT(zt));
RWLOCK(&zt->rwlock, isc_rwlocktype_read);
result = dns_zt_apply2(zt, ISC_FALSE, &tresult, freezezones, &freeze);
RWUNLOCK(&zt->rwlock, isc_rwlocktype_read);
return ((result == ISC_R_SUCCESS) ? tresult : result);
}
isc_result_t
dns_zt_loadnew(dns_zt_t *zt, isc_boolean_t stop) {
isc_result_t result;
REQUIRE(VALID_ZT(zt));
RWLOCK(&zt->rwlock, isc_rwlocktype_read);
result = dns_zt_apply(zt, stop, loadnew, NULL);
RWUNLOCK(&zt->rwlock, isc_rwlocktype_read);
return (result);
}
void
dns_zt_attach(dns_zt_t *zt, dns_zt_t **ztp) {
REQUIRE(VALID_ZT(zt));
REQUIRE(ztp != NULL && *ztp == NULL);
RWLOCK(&zt->rwlock, isc_rwlocktype_write);
INSIST(zt->references > 0);
zt->references++;
INSIST(zt->references != 0);
RWUNLOCK(&zt->rwlock, isc_rwlocktype_write);
*ztp = zt;
}
isc_result_t
dns_zt_apply2(dns_zt_t *zt, isc_boolean_t stop, isc_result_t *sub,
isc_result_t (*action)(dns_zone_t *, void *), void *uap)
{
dns_rbtnode_t *node;
dns_rbtnodechain_t chain;
isc_result_t result, tresult = ISC_R_SUCCESS;
dns_zone_t *zone;
REQUIRE(VALID_ZT(zt));
REQUIRE(action != NULL);
dns_rbtnodechain_init(&chain, zt->mctx);
result = dns_rbtnodechain_first(&chain, zt->table, NULL, NULL);
if (result == ISC_R_NOTFOUND) {
/*
* The tree is empty.
*/
tresult = result;
result = ISC_R_NOMORE;
}
while (result == DNS_R_NEWORIGIN || result == ISC_R_SUCCESS) {
result = dns_rbtnodechain_current(&chain, NULL, NULL,
&node);
if (result == ISC_R_SUCCESS) {
zone = node->data;
if (zone != NULL)
result = (action)(zone, uap);
if (result != ISC_R_SUCCESS && stop) {
tresult = result;
goto cleanup; /* don't break */
} else if (result != ISC_R_SUCCESS &&
tresult == ISC_R_SUCCESS)
tresult = result;
}
result = dns_rbtnodechain_next(&chain, NULL, NULL);
}
if (result == ISC_R_NOMORE)
result = ISC_R_SUCCESS;
cleanup:
dns_rbtnodechain_invalidate(&chain);
if (sub != NULL)
*sub = tresult;
return (result);
}
isc_result_t
dns_zt_unmount(dns_zt_t *zt, dns_zone_t *zone) {
isc_result_t result;
dns_name_t *name;
REQUIRE(VALID_ZT(zt));
name = dns_zone_getorigin(zone);
RWLOCK(&zt->rwlock, isc_rwlocktype_write);
result = dns_rbt_deletename(zt->table, name, ISC_FALSE);
RWUNLOCK(&zt->rwlock, isc_rwlocktype_write);
return (result);
}
isc_result_t
dns_zt_mount(dns_zt_t *zt, dns_zone_t *zone) {
isc_result_t result;
dns_zone_t *dummy = NULL;
dns_name_t *name;
REQUIRE(VALID_ZT(zt));
name = dns_zone_getorigin(zone);
RWLOCK(&zt->rwlock, isc_rwlocktype_write);
result = dns_rbt_addname(zt->table, name, zone);
if (result == ISC_R_SUCCESS)
dns_zone_attach(zone, &dummy);
RWUNLOCK(&zt->rwlock, isc_rwlocktype_write);
return (result);
}
/*
* Initiates asynchronous loading of zone 'zone'. 'callback' is a
* pointer to a function which will be used to inform the caller when
* the zone loading is complete.
*/
static isc_result_t
asyncload(dns_zone_t *zone, void *callback) {
isc_result_t result;
dns_zt_zoneloaded_t *loaded = callback;
dns_zt_t *zt;
REQUIRE(zone != NULL);
zt = dns_zone_getview(zone)->zonetable;
INSIST(VALID_ZT(zt));
INSIST(zt->references > 0);
zt->references++;
zt->loads_pending++;
result = dns_zone_asyncload(zone, *loaded, zt);
if (result != ISC_R_SUCCESS) {
zt->references--;
zt->loads_pending--;
INSIST(zt->references > 0);
}
return (ISC_R_SUCCESS);
}
isc_result_t
dns_zt_find(dns_zt_t *zt, dns_name_t *name, unsigned int options,
dns_name_t *foundname, dns_zone_t **zonep)
{
isc_result_t result;
dns_zone_t *dummy = NULL;
unsigned int rbtoptions = 0;
REQUIRE(VALID_ZT(zt));
if ((options & DNS_ZTFIND_NOEXACT) != 0)
rbtoptions |= DNS_RBTFIND_NOEXACT;
RWLOCK(&zt->rwlock, isc_rwlocktype_read);
result = dns_rbt_findname(zt->table, name, rbtoptions, foundname,
(void **) (void*)&dummy);
if (result == ISC_R_SUCCESS || result == DNS_R_PARTIALMATCH)
dns_zone_attach(dummy, zonep);
RWUNLOCK(&zt->rwlock, isc_rwlocktype_read);
return (result);
}
