From 0f04c8e7c1219940baf0ae9c1bcb2464ddf079df Mon Sep 17 00:00:00 2001
From: Mark Reynolds <mreynolds@redhat.com>
Date: Tue, 16 May 2017 13:19:43 -0400
Subject: [PATCH] Ticket 49257 - Reject nsslapd-cachememsize &
 nsslapd-cachesize when nsslapd-cache-autosize is set

Description:  We need to also reject entry cache changes when cache autosizing is being used.

              I also found out that we were not registering the ldbm instance callbacks at startup.
              So all those functions were only used when creating an instance, and not after it was
              started.

https://pagure.io/389-ds-base/issue/49257

Reviewed by: tbordaz(Thanks!)
---
 ldap/servers/slapd/back-ldbm/instance.c            | 19 +++++++++----
 .../servers/slapd/back-ldbm/ldbm_instance_config.c | 32 ++++++++++++++++++++--
 ldap/servers/slapd/back-ldbm/start.c               |  2 +-
 3 files changed, 44 insertions(+), 9 deletions(-)

diff --git a/ldap/servers/slapd/back-ldbm/instance.c b/ldap/servers/slapd/back-ldbm/instance.c
index f79d048..8b38644 100644
--- a/ldap/servers/slapd/back-ldbm/instance.c
+++ b/ldap/servers/slapd/back-ldbm/instance.c
@@ -302,12 +302,19 @@ ldbm_instance_startall(struct ldbminfo *li)
         inst = (ldbm_instance *) object_get_data(inst_obj);
         ldbm_instance_set_flags(inst);
         rc1 = ldbm_instance_start(inst->inst_be);
-    if (rc1 != 0) {
-        rc = rc1;
-    } else {
-        vlv_init(inst);
-        slapi_mtn_be_started(inst->inst_be);
-    }
+        if (rc1 != 0) {
+            rc = rc1;
+        } else {
+            if(ldbm_instance_config_load_dse_info(inst) != 0){
+                slapi_log_err(SLAPI_LOG_ERR, "ldbm_instance_startall",
+                    "Loading database instance configuration failed for (%s)\n",
+                    inst->inst_name);
+                rc = -1;
+            } else {
+                vlv_init(inst);
+                slapi_mtn_be_started(inst->inst_be);
+            }
+        }
         inst_obj = objset_next_obj(li->li_instance_set, inst_obj);
     }
 
diff --git a/ldap/servers/slapd/back-ldbm/ldbm_instance_config.c b/ldap/servers/slapd/back-ldbm/ldbm_instance_config.c
index 55f1887..49a6cac 100644
--- a/ldap/servers/slapd/back-ldbm/ldbm_instance_config.c
+++ b/ldap/servers/slapd/back-ldbm/ldbm_instance_config.c
@@ -72,6 +72,18 @@ ldbm_instance_config_cachesize_set(void *arg, void *value, char *errorbuf, int p
     /* Do whatever we can to make sure the data is ok. */
 
     if (apply) {
+        if (CONFIG_PHASE_RUNNING == phase) {
+            if (val > 0 && inst->inst_li->li_cache_autosize) {
+                /* We are auto-tuning the cache, so this change would be overwritten - return an error */
+                slapi_create_errormsg(errorbuf, SLAPI_DSE_RETURNTEXT_SIZE,
+                    "Error: \"nsslapd-cachesize\" can not be updated while \"nsslapd-cache-autosize\" is set "
+                    "in \"cn=config,cn=ldbm database,cn=plugins,cn=config\".");
+                slapi_log_err(SLAPI_LOG_ERR, "ldbm_instance_config_cachesize_set",
+                    "\"nsslapd-cachesize\" can not be set while \"nsslapd-cache-autosize\" is set "
+                    "in \"cn=config,cn=ldbm database,cn=plugins,cn=config\".\n");
+                return LDAP_UNWILLING_TO_PERFORM;
+            }
+        }
         cache_set_max_entries(&(inst->inst_cache), val);
     }
 
@@ -87,7 +99,11 @@ ldbm_instance_config_cachememsize_get(void *arg)
 }
 
 static int 
-ldbm_instance_config_cachememsize_set(void *arg, void *value, char *errorbuf, int phase, int apply) 
+ldbm_instance_config_cachememsize_set(void *arg,
+                                      void *value,
+                                      char *errorbuf,
+                                      int phase,
+                                      int apply)
 {
     ldbm_instance *inst = (ldbm_instance *) arg;
     int retval = LDAP_SUCCESS;
@@ -107,6 +123,18 @@ ldbm_instance_config_cachememsize_set(void *arg, void *value, char *errorbuf, in
      */
 
     if (apply) {
+        if (CONFIG_PHASE_RUNNING == phase) {
+            if (val > 0 && inst->inst_li->li_cache_autosize) {
+                /* We are auto-tuning the cache, so this change would be overwritten - return an error */
+                slapi_create_errormsg(errorbuf, SLAPI_DSE_RETURNTEXT_SIZE,
+                    "Error: \"nsslapd-cachememsize\" can not be updated while \"nsslapd-cache-autosize\" is set "
+                    "in \"cn=config,cn=ldbm database,cn=plugins,cn=config\".");
+                slapi_log_err(SLAPI_LOG_ERR, "ldbm_instance_config_cachememsize_set",
+                    "\"nsslapd-cachememsize\" can not be set while \"nsslapd-cache-autosize\" is set "
+                    "in \"cn=config,cn=ldbm database,cn=plugins,cn=config\".\n");
+                return LDAP_UNWILLING_TO_PERFORM;
+            }
+        }
         if (val > inst->inst_cache.c_maxsize) {
             delta = val - inst->inst_cache.c_maxsize;
             delta_original = delta;
@@ -825,7 +853,7 @@ ldbm_instance_modify_config_entry_callback(Slapi_PBlock *pb, Slapi_Entry* entryB
                 continue;
             }
 
-        /* This assumes there is only one bval for this mod. */
+            /* This assumes there is only one bval for this mod. */
             if (mods[i]->mod_bvalues == NULL) {
                 /* This avoids the null pointer deref.
                  * In ldbm_config.c ldbm_config_set, it checks for the NULL.
diff --git a/ldap/servers/slapd/back-ldbm/start.c b/ldap/servers/slapd/back-ldbm/start.c
index 1834a19..d4e8bb8 100644
--- a/ldap/servers/slapd/back-ldbm/start.c
+++ b/ldap/servers/slapd/back-ldbm/start.c
@@ -169,7 +169,7 @@ ldbm_back_start_autotune(struct ldbminfo *li) {
     }
 
     slapi_log_err(SLAPI_LOG_NOTICE, "ldbm_back_start", "found %luk physical memory\n", mi->system_total_bytes / 1024);
-    slapi_log_err(SLAPI_LOG_NOTICE, "ldbm_back_start", "found %luk avaliable\n", mi->system_available_bytes / 1024);
+    slapi_log_err(SLAPI_LOG_NOTICE, "ldbm_back_start", "found %luk available\n", mi->system_available_bytes / 1024);
 
     /* We've now calculated the autotuning values. Do we need to apply it?
      * we use the logic of "if size is 0, or autosize is > 0. This way three
-- 
2.9.4