Ticket #342 - better error message when cache overflows (phase 2)

Description: commit 892bf12c1bb8b10afea3d6ff711059bf04e362cc only
logs detailed cache overflow message on the allow ACIs. This patch
logs the same message when the cache overflow occurs on the deny
ACIs.

https://fedorahosted.org/389/ticket/342

Reviewed by rmeggins (Thank you, Rich!!)

ldap/servers/plugins/acl/acl.c

@@ -2807,16 +2807,16 @@ acl__TestRights(Acl_PBlock *aclpb,int access, const char **right, const char **
 
 		if (access  & ( SLAPI_ACL_SEARCH | SLAPI_ACL_READ)) {
 
-                        /* We can not reused results obtained on a other entry */
-                        if (aci->aci_type & ACI_CACHE_RESULT_PER_ENTRY) {
-                                aclpb->aclpb_state |= ACLPB_CACHE_RESULT_PER_ENTRY_SKIP;
-                        }
+			/* We can not reused results obtained on a other entry */
+			if (aci->aci_type & ACI_CACHE_RESULT_PER_ENTRY) {
+				aclpb->aclpb_state |= ACLPB_CACHE_RESULT_PER_ENTRY_SKIP;
+			}
                         
 			/*
 			 * aclpb->aclpb_cache_result[0..aclpb->aclpb_last_cache_result] is
 			 * a cache of info about whether applicable acis
 			 * allowed, did_not_allow or denied access
-			*/			
+			 */
 			for (j =0; j < aclpb->aclpb_last_cache_result; j++) {
 				if (index == aclpb->aclpb_cache_result[j].aci_index) {
 					short  result;
@@ -2919,15 +2919,28 @@ acl__TestRights(Acl_PBlock *aclpb,int access, const char **right, const char **
 
 			if ( j < aclpb->aclpb_last_cache_result)  {
 				/* already in cache */
+				aclpb->aclpb_cache_result[j].result &= ~ACLPB_CACHE_ERROR_REPORTED;
 			} else if ( j < aclpb_max_cache_results ) {
 				/* j == aclpb->aclpb_last_cache_result  &&
 					j < ACLPB_MAX_CACHE_RESULTS */
 				aclpb->aclpb_last_cache_result++;
 				aclpb->aclpb_cache_result[j].aci_index = index;
 				aclpb->aclpb_cache_result[j].aci_ruleType = aci->aci_ruleType; 
-
+				aclpb->aclpb_cache_result[j].result &= ~ACLPB_CACHE_ERROR_REPORTED;
 			} else {  /* cache overflow */
-				if (  rights_rv == ACL_RES_DENY) {
+				if (!(aclpb->aclpb_cache_result[j].result &
+				      ACLPB_CACHE_ERROR_REPORTED)) {
+					slapi_log_error (SLAPI_LOG_FATAL, "acl__TestRights",
+					    "Your ACL cache of %d slots has overflowed. "
+					    "This can happen when you have many ACIs. "
+					    "This ACI evaluation requires %d slots to cache. "
+					    "You can increase your max value by setting the attribute "
+					    "%s in cn=ACL Plugin,cn=plugins,cn=config to a value higher. "
+					    "A server restart is required.\n",
+					    j, aclpb_max_cache_results, ATTR_ACLPB_MAX_SELECTED_ACLS);
+					aclpb->aclpb_cache_result[j].result |= ACLPB_CACHE_ERROR_REPORTED;
+				}
+				if (rights_rv == ACL_RES_DENY) {
 					result_reason->deciding_aci = aci;
 					result_reason->reason = ACL_REASON_EVALUATED_DENY;
 					TNF_PROBE_1_DEBUG(acl__TestRights_end,"ACL","",
@@ -2986,8 +2999,7 @@ acl__TestRights(Acl_PBlock *aclpb,int access, const char **right, const char **
 				return ACL_RES_DENY;
 			}
 		}
-	}
-
+	} /* for (i=0, k=0; i < numHandles && k < aclpb->aclpb_num_deny_handles; ++i) */
 
 	/*
 	** START PROCESSING ALLOW HANDLES.
@@ -3023,10 +3035,10 @@ acl__TestRights(Acl_PBlock *aclpb,int access, const char **right, const char **
 
 		if (access  & ( SLAPI_ACL_SEARCH | SLAPI_ACL_READ)) {
 
-                        /* We can not reused results obtained on a other entry */
-                        if (aci->aci_type & ACI_CACHE_RESULT_PER_ENTRY) {
-                                aclpb->aclpb_state |= ACLPB_CACHE_RESULT_PER_ENTRY_SKIP;
-                        }
+			/* We can not reused results obtained on a other entry */
+			if (aci->aci_type & ACI_CACHE_RESULT_PER_ENTRY) {
+				aclpb->aclpb_state |= ACLPB_CACHE_RESULT_PER_ENTRY_SKIP;
+			}
 			/*
 			 * aclpb->aclpb_cache_result[0..aclpb->aclpb_last_cache_result] is
 			 * a cache of info about whether applicable acis
@@ -3198,7 +3210,7 @@ acl__TestRights(Acl_PBlock *aclpb,int access, const char **right, const char **
 				return ACL_RES_ALLOW;
 			}
 		}
-	}/* for */
+	} /* for (i=0, k=0; i < numHandles && k < aclpb->aclpb_num_allow_handles ; ++i) { */
 	result_reason->deciding_aci = aci;
 	result_reason->reason = ACL_REASON_NO_MATCHED_SUBJECT_ALLOWS;