Make flush_writes the default. Change option to 'dbcachenowsync'.

Change backend struct option to li_dbcachewsync.

doc/man/man5/slapd.conf.5

@@ -266,6 +266,10 @@ by the LDBM backend database instance.  The default is 1000 entries.
 Specify the size in bytes of the in-memory cache associated 
 with each open index file. If not supported by the underlying database 
 method, this option is ignored without comment.  The default is 100000 bytes.
+.B dbcachenowsync
+Specify that database writes should not be immediately synchronized
+with in memory changes.  Enabling this option may improving performance
+at the expense of data security.
 .TP
 .B directory <directory>
 Specify the directory where the LDBM files containing the database and

servers/slapd/back-ldbm/back-ldbm.h

@@ -110,7 +110,7 @@ struct ldbminfo {
 	struct cache		li_cache;
 	Avlnode			*li_attrs;
 	int			li_dbcachesize;
-	int			li_flush_wrt;
+	int			li_dbcachewsync;
 	struct dbcache		li_dbcache[MAXDBCACHE];
 	pthread_mutex_t		li_dbcache_mutex;
 	pthread_cond_t		li_dbcache_cv;

servers/slapd/back-ldbm/config.c

@@ -80,9 +80,9 @@ ldbm_back_config(
 		}
 		li->li_dbcachesize = atoi( argv[1] );
 
-	/* flush on writes */
-	} else if ( strcasecmp( argv[0], "flushwrites" ) == 0 ) {
-		li->li_flush_wrt = 1;
+	/* no write sync */
+	} else if ( strcasecmp( argv[0], "dbcachenowsync" ) == 0 ) {
+		li->li_dbcachewsync = 0;
 
 	/* anything else */
 	} else {

servers/slapd/back-ldbm/dn2id.c

@@ -50,7 +50,7 @@ dn2id_add(
 	data.dsize = sizeof(ID);
 
 	flags = LDBM_INSERT;
-	if ( li->li_flush_wrt ) flags |= LDBM_SYNC;
+	if ( li->li_dbcachewsync ) flags |= LDBM_SYNC;
 
 	rc = ldbm_cache_store( db, key, data, flags );
 

servers/slapd/back-ldbm/id2entry.c

@@ -48,7 +48,7 @@ id2entry_add( Backend *be, Entry *e )
 
 	/* store it */
 	flags = LDBM_REPLACE;
-	if ( li->li_flush_wrt ) flags |= LDBM_SYNC;
+	if ( li->li_dbcachewsync ) flags |= LDBM_SYNC;
 	rc = ldbm_cache_store( db, key, data, flags );
 
 	pthread_mutex_unlock( &entry2str_mutex );

servers/slapd/back-ldbm/idl.c

@@ -195,7 +195,7 @@ idl_store(
 #endif
 
 	flags = LDBM_REPLACE;
-	if( li->li_flush_wrt ) flags |= LDBM_SYNC;
+	if( li->li_dbcachewsync ) flags = LDBM_SYNC;
 	rc = ldbm_cache_store( db, key, data, flags );
 
 	/* Debug( LDAP_DEBUG_TRACE, "<= idl_store %d\n", rc, 0, 0 ); */

servers/slapd/back-ldbm/init.c

@@ -34,6 +34,9 @@ ldbm_back_init(
 	/* default database cache size */
 	li->li_dbcachesize = DEFAULT_DBCACHE_SIZE;
 
+	/* default cache mode is sync on write */
+	li->li_dbcachewsync = 1;
+
 	/* default file creation mode */
 	li->li_mode = DEFAULT_MODE;