/* dbcache.c - manage cache of open databases */
/* $OpenLDAP$ */
/*
- * Copyright 1998-2001 The OpenLDAP Foundation, All Rights Reserved.
+ * Copyright 1998-2002 The OpenLDAP Foundation, All Rights Reserved.
* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
*/
#include "slap.h"
#include "back-bdb.h"
+#include "lutil_hash.h"
+
+/* Pass-thru hash function. Since the indexer is already giving us hash
+ * values as keys, we don't need BDB to re-hash them.
+ */
+#if LUTIL_HASH_BYTES == 4
+static u_int32_t
+bdb_db_hash(
+ DB *db,
+ const void *bytes,
+ u_int32_t length
+)
+{
+ u_int32_t *ret = (u_int32_t *)bytes;
+ return *ret;
+}
+#endif
int
bdb_db_cache(
- Backend *be,
- const char *name,
- DB *db )
+ Backend *be,
+ const char *name,
+ DB **dbout )
{
- return -1;
+ int i;
+ int rc;
+ struct bdb_info *bdb = (struct bdb_info *) be->be_private;
+ struct bdb_db_info *db;
+ char *file;
+
+ *dbout = NULL;
+
+ for( i=BDB_NDB; bdb->bi_databases[i]; i++ ) {
+ if( !strcmp( bdb->bi_databases[i]->bdi_name, name) ) {
+ *dbout = bdb->bi_databases[i]->bdi_db;
+ return 0;
+ }
+ }
+
+ ldap_pvt_thread_mutex_lock( &bdb->bi_database_mutex );
+
+ /* check again! may have been added by another thread */
+ for( i=BDB_NDB; bdb->bi_databases[i]; i++ ) {
+ if( !strcmp( bdb->bi_databases[i]->bdi_name, name) ) {
+ *dbout = bdb->bi_databases[i]->bdi_db;
+ ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
+ return 0;
+ }
+ }
+
+ if( i >= BDB_INDICES ) {
+ ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
+ return -1;
+ }
+
+ db = (struct bdb_db_info *) ch_calloc(1, sizeof(struct bdb_db_info));
+
+ db->bdi_name = ch_strdup( name );
+
+ rc = db_create( &db->bdi_db, bdb->bi_dbenv, 0 );
+ if( rc != 0 ) {
+ Debug( LDAP_DEBUG_ANY,
+ "bdb_db_cache: db_create(%s) failed: %s (%d)\n",
+ bdb->bi_dbenv_home, db_strerror(rc), rc );
+ ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
+ return rc;
+ }
+
+ rc = db->bdi_db->set_pagesize( db->bdi_db, BDB_PAGESIZE );
+#if LUTIL_HASH_BYTES == 4
+ rc = db->bdi_db->set_h_hash( db->bdi_db, bdb_db_hash );
+#endif
+#ifdef BDB_IDL_MULTI
+ rc = db->bdi_db->set_flags( db->bdi_db, DB_DUP | DB_DUPSORT );
+ rc = db->bdi_db->set_dup_compare( db->bdi_db, bdb_bt_compare );
+#endif
+
+ file = ch_malloc( strlen( name ) + sizeof(BDB_SUFFIX) );
+ sprintf( file, "%s" BDB_SUFFIX, name );
+
+ rc = db->bdi_db->open( db->bdi_db,
+ file, name,
+ DB_HASH, bdb->bi_db_opflags | DB_CREATE | DB_THREAD,
+ bdb->bi_dbenv_mode );
+
+ ch_free( file );
+
+ if( rc != 0 ) {
+ Debug( LDAP_DEBUG_ANY,
+ "bdb_db_cache: db_open(%s) failed: %s (%d)\n",
+ name, db_strerror(rc), rc );
+ ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
+ return rc;
+ }
+
+ bdb->bi_databases[i+1] = NULL;
+ bdb->bi_databases[i] = db;
+ bdb->bi_ndatabases = i+1;
+
+ *dbout = db->bdi_db;
+
+ ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
+ return 0;
}