completely new winbindd cache infrastructure

this one looks like just another winbind backend, and has the
following properties:

- does -ve and +ve cacheing of all queries

- can be disabled with -n switch to winbindd

- stores all records packed, so even huge domains are not a problem
for a complete cache

- handles the server being down

- uses sequence numbers for all entries

This fixes a lot of problems with winbindd. Serving from cache is now
*very* fast.
(This used to be commit fddb4f4c04473a60a97212c0c8e143d6a4d68380)

1 files changed, 8 insertions, 5 deletions

diff --git a/source3/nsswitch/winbindd_ads.c b/source3/nsswitch/winbindd_ads.c
index 2510e4a501..cabb482f7d 100644
--- a/source3/nsswitch/winbindd_ads.c
+++ b/source3/nsswitch/winbindd_ads.c
@@ -641,17 +641,20 @@ done:
 }
 
 /* find the sequence number for a domain */
-static uint32 sequence_number(struct winbindd_domain *domain)
+static NTSTATUS sequence_number(struct winbindd_domain *domain, uint32 *seq)
 {
-	uint32 usn;
 	ADS_STRUCT *ads = NULL;
 
+	*seq = DOM_SEQUENCE_NONE;
+
 	ads = ads_cached_connection(domain);
-	if (!ads) return DOM_SEQUENCE_NONE;
+	if (!ads) return NT_STATUS_UNSUCCESSFUL;
 
-	if (!ads_USN(ads, &usn)) return DOM_SEQUENCE_NONE;
+	if (!ads_USN(ads, seq)) {
+		return NT_STATUS_UNSUCCESSFUL;
+	}
 
-	return usn;
+	return NT_STATUS_OK;
 }
 
 /* the ADS backend methods are exposed via this structure */