/* dbcache.c - manage cache of open databases */
/* $OpenLDAP$ */
/*
- * Copyright 1998-2001 The OpenLDAP Foundation, All Rights Reserved.
+ * Copyright 1998-2003 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.
+ */
+static u_int32_t
+bdb_db_hash(
+ DB *db,
+ const void *bytes,
+ u_int32_t length
+)
+{
+ u_int32_t i, ret = 0;
+
+ if ( length > sizeof(u_int32_t) )
+ length = sizeof(u_int32_t);
+
+ for( i = 0; i < length; i++ )
+ ret = (ret << 8) + ((const unsigned char *)bytes)[i];
+ return ret;
+}
int
bdb_db_cache(
- Backend *be,
- const char *name,
+ Backend *be,
+ DB_TXN *tid,
+ const char *name,
DB **dbout )
{
int i;
int rc;
+ int flags;
struct bdb_info *bdb = (struct bdb_info *) be->be_private;
struct bdb_db_info *db;
char *file;
+ DBT lockobj;
+ DB_LOCK lock;
+ u_int32_t locker = 0;
*dbout = NULL;
- for( i=BDB_NDB; bdb->bi_databases[i]->bdi_name; i++ ) {
+ for( i=BDB_NDB; i < bdb->bi_ndatabases; i++ ) {
if( !strcmp( bdb->bi_databases[i]->bdi_name, name) ) {
*dbout = bdb->bi_databases[i]->bdi_db;
return 0;
}
}
+ lockobj.data = "bdb_db_cache";
+ lockobj.size = sizeof("bdb_db_cache");
+
+ if (tid) {
+ locker = TXN_ID( tid );
+ } else {
+#ifdef BDB_REUSE_LOCKERS
+#define op NULL /* implicit arg in LOCK_ID */
+#endif
+ rc = LOCK_ID( bdb->bi_dbenv, &locker );
+ if (rc) return rc;
+ }
+ rc = LOCK_GET( bdb->bi_dbenv, locker, 0, &lockobj,
+ DB_LOCK_WRITE, &lock );
+ if (rc) return rc;
+
+ /* check again! may have been added by another thread */
+ for( i=BDB_NDB; i < bdb->bi_ndatabases; i++ ) {
+ if( !strcmp( bdb->bi_databases[i]->bdi_name, name) ) {
+ *dbout = bdb->bi_databases[i]->bdi_db;
+ LOCK_PUT( bdb->bi_dbenv, &lock);
+ return 0;
+ }
+ }
+
if( i >= BDB_INDICES ) {
+ LOCK_PUT( bdb->bi_dbenv, &lock);
return -1;
}
rc = db_create( &db->bdi_db, bdb->bi_dbenv, 0 );
if( rc != 0 ) {
+#ifdef NEW_LOGGING
+ LDAP_LOG ( CACHE, ERR,
+ "bdb_db_cache: db_create(%s) failed: %s (%d)\n",
+ bdb->bi_dbenv_home, db_strerror(rc), rc );
+#else
Debug( LDAP_DEBUG_ANY,
"bdb_db_cache: db_create(%s) failed: %s (%d)\n",
bdb->bi_dbenv_home, db_strerror(rc), rc );
+#endif
+ LOCK_PUT( bdb->bi_dbenv, &lock);
return rc;
}
+ rc = db->bdi_db->set_pagesize( db->bdi_db, BDB_PAGESIZE );
+ rc = db->bdi_db->set_h_hash( db->bdi_db, bdb_db_hash );
+ 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 );
+
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_BTREE, DB_CREATE|DB_THREAD,
+#ifdef HAVE_EBCDIC
+ __atoe( file );
+#endif
+ flags = bdb->bi_db_opflags | DB_CREATE | DB_THREAD;
+ if ( !tid ) flags |= DB_AUTO_COMMIT;
+ rc = DB_OPEN( db->bdi_db, tid,
+ file, NULL /* name */,
+ DB_HASH, flags,
bdb->bi_dbenv_mode );
ch_free( file );
if( rc != 0 ) {
+#ifdef NEW_LOGGING
+ LDAP_LOG ( CACHE, ERR,
+ "bdb_db_cache: db_open(%s) failed: %s (%d)\n",
+ name, db_strerror(rc), rc );
+#else
Debug( LDAP_DEBUG_ANY,
"bdb_db_cache: db_open(%s) failed: %s (%d)\n",
name, db_strerror(rc), rc );
+#endif
+ LOCK_PUT( bdb->bi_dbenv, &lock);
return rc;
}
bdb->bi_databases[i] = db;
+ bdb->bi_ndatabases = i+1;
*dbout = db->bdi_db;
+ LOCK_PUT( bdb->bi_dbenv, &lock );
return 0;
}