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https://git.openldap.org/openldap/openldap.git
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158 lines
3.7 KiB
C
158 lines
3.7 KiB
C
/* dbcache.c - manage cache of open databases */
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/* $OpenLDAP$ */
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/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
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*
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* Copyright 2000-2004 The OpenLDAP Foundation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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#include "portable.h"
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#include <stdio.h>
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#include <ac/errno.h>
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#include <ac/socket.h>
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#include <ac/string.h>
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#include <ac/time.h>
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#include <sys/stat.h>
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#include "slap.h"
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#include "back-bdb.h"
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#include "lutil_hash.h"
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#ifdef BDB_INDEX_USE_HASH
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/* Pass-thru hash function. Since the indexer is already giving us hash
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* values as keys, we don't need BDB to re-hash them.
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*/
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static u_int32_t
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bdb_db_hash(
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DB *db,
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const void *bytes,
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u_int32_t length
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)
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{
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u_int32_t ret = 0;
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unsigned char *dst = (unsigned char *)&ret;
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const unsigned char *src = (const unsigned char *)bytes;
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if ( length > sizeof(u_int32_t) )
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length = sizeof(u_int32_t);
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while ( length ) {
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*dst++ = *src++;
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length--;
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}
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return ret;
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}
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#define BDB_INDEXTYPE DB_HASH
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#else
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#define BDB_INDEXTYPE DB_BTREE
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#endif
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int
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bdb_db_cache(
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Backend *be,
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const char *name,
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DB **dbout )
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{
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int i;
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int rc;
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struct bdb_info *bdb = (struct bdb_info *) be->be_private;
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struct bdb_db_info *db;
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char *file;
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*dbout = NULL;
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for( i=BDB_NDB; i < bdb->bi_ndatabases; i++ ) {
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if( !strcmp( bdb->bi_databases[i]->bdi_name, name) ) {
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*dbout = bdb->bi_databases[i]->bdi_db;
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return 0;
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}
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}
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ldap_pvt_thread_mutex_lock( &bdb->bi_database_mutex );
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/* check again! may have been added by another thread */
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for( i=BDB_NDB; i < bdb->bi_ndatabases; i++ ) {
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if( !strcmp( bdb->bi_databases[i]->bdi_name, name) ) {
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*dbout = bdb->bi_databases[i]->bdi_db;
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ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
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return 0;
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}
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}
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if( i >= BDB_INDICES ) {
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ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
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return -1;
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}
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db = (struct bdb_db_info *) ch_calloc(1, sizeof(struct bdb_db_info));
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db->bdi_name = ch_strdup( name );
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rc = db_create( &db->bdi_db, bdb->bi_dbenv, 0 );
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if( rc != 0 ) {
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#ifdef NEW_LOGGING
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LDAP_LOG ( CACHE, ERR,
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"bdb_db_cache: db_create(%s) failed: %s (%d)\n",
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bdb->bi_dbenv_home, db_strerror(rc), rc );
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#else
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Debug( LDAP_DEBUG_ANY,
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"bdb_db_cache: db_create(%s) failed: %s (%d)\n",
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bdb->bi_dbenv_home, db_strerror(rc), rc );
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#endif
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ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
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return rc;
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}
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rc = db->bdi_db->set_pagesize( db->bdi_db, BDB_PAGESIZE );
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#ifdef BDB_INDEX_USE_HASH
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rc = db->bdi_db->set_h_hash( db->bdi_db, bdb_db_hash );
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#endif
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rc = db->bdi_db->set_flags( db->bdi_db, DB_DUP | DB_DUPSORT );
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rc = db->bdi_db->set_dup_compare( db->bdi_db, bdb_bt_compare );
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file = ch_malloc( strlen( name ) + sizeof(BDB_SUFFIX) );
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sprintf( file, "%s" BDB_SUFFIX, name );
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#ifdef HAVE_EBCDIC
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__atoe( file );
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#endif
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rc = DB_OPEN( db->bdi_db,
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file, NULL /* name */,
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BDB_INDEXTYPE, bdb->bi_db_opflags | DB_CREATE | DB_THREAD,
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bdb->bi_dbenv_mode );
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ch_free( file );
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if( rc != 0 ) {
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#ifdef NEW_LOGGING
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LDAP_LOG ( CACHE, ERR,
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"bdb_db_cache: db_open(%s) failed: %s (%d)\n",
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name, db_strerror(rc), rc );
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#else
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Debug( LDAP_DEBUG_ANY,
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"bdb_db_cache: db_open(%s) failed: %s (%d)\n",
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name, db_strerror(rc), rc );
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#endif
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ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
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return rc;
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}
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bdb->bi_databases[i] = db;
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bdb->bi_ndatabases = i+1;
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*dbout = db->bdi_db;
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ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
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return 0;
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}
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