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https://git.openldap.org/openldap/openldap.git
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123 lines
2.7 KiB
C
123 lines
2.7 KiB
C
/* dbcache.c - manage cache of open databases */
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/* $OpenLDAP$ */
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/*
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* Copyright 1998-2001 The OpenLDAP Foundation, All Rights Reserved.
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* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
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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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/* 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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#if LUTIL_HASH_BYTES == 4
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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 = (u_int32_t *)bytes;
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return *ret;
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}
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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; bdb->bi_databases[i]; 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; bdb->bi_databases[i]; 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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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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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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#if LUTIL_HASH_BYTES == 4
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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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#ifdef BDB_IDL_MULTI
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rc = db->bdi_db->set_flags( db->bdi_db, DB_DUP | DB_DUPSORT );
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#endif
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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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rc = db->bdi_db->open( db->bdi_db,
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file, name,
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DB_HASH, 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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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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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+1] = NULL;
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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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