git.sur5r.net Git - openldap/blob - servers/slapd/back-bdb/dbcache.c

   1 /* dbcache.c - manage cache of open databases */
   2 /* $OpenLDAP$ */
   3 /*
   4  * Copyright 1998-2003 The OpenLDAP Foundation, All Rights Reserved.
   5  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   6  */
   7
   8 #include "portable.h"
   9
  10 #include <stdio.h>
  11
  12 #include <ac/errno.h>
  13 #include <ac/socket.h>
  14 #include <ac/string.h>
  15 #include <ac/time.h>
  16 #include <sys/stat.h>
  17
  18 #include "slap.h"
  19 #include "back-bdb.h"
  20 #include "lutil_hash.h"
  21
  22 /* Pass-thru hash function. Since the indexer is already giving us hash
  23  * values as keys, we don't need BDB to re-hash them.
  24  */
  25 static u_int32_t
  26 bdb_db_hash(
  27         DB *db,
  28         const void *bytes,
  29         u_int32_t length
  30 )
  31 {
  32         u_int32_t ret = 0;
  33         unsigned char *dst = (unsigned char *)&ret;
  34         const unsigned char *src = (const unsigned char *)bytes;
  35
  36         if ( length > sizeof(u_int32_t) )
  37                 length = sizeof(u_int32_t);
  38
  39         while ( length ) {
  40                 *dst++ = *src++;
  41                 length--;
  42         }
  43         return ret;
  44 }
  45
  46 int
  47 bdb_db_cache(
  48         Backend *be,
  49         const char *name,
  50         DB **dbout )
  51 {
  52         int i;
  53         int rc;
  54         struct bdb_info *bdb = (struct bdb_info *) be->be_private;
  55         struct bdb_db_info *db;
  56         char *file;
  57
  58         *dbout = NULL;
  59
  60         for( i=BDB_NDB; bdb->bi_databases[i]; i++ ) {
  61                 if( !strcmp( bdb->bi_databases[i]->bdi_name, name) ) {
  62                         *dbout = bdb->bi_databases[i]->bdi_db;
  63                         return 0;
  64                 }
  65         }
  66
  67         ldap_pvt_thread_mutex_lock( &bdb->bi_database_mutex );
  68
  69         /* check again! may have been added by another thread */
  70         for( i=BDB_NDB; bdb->bi_databases[i]; i++ ) {
  71                 if( !strcmp( bdb->bi_databases[i]->bdi_name, name) ) {
  72                         *dbout = bdb->bi_databases[i]->bdi_db;
  73                         ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
  74                         return 0;
  75                 }
  76         }
  77
  78         if( i >= BDB_INDICES ) {
  79                 ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
  80                 return -1;
  81         }
  82
  83         db = (struct bdb_db_info *) ch_calloc(1, sizeof(struct bdb_db_info));
  84
  85         db->bdi_name = ch_strdup( name );
  86
  87         rc = db_create( &db->bdi_db, bdb->bi_dbenv, 0 );
  88         if( rc != 0 ) {
  89 #ifdef NEW_LOGGING
  90                 LDAP_LOG ( CACHE, ERR,
  91                         "bdb_db_cache: db_create(%s) failed: %s (%d)\n",
  92                         bdb->bi_dbenv_home, db_strerror(rc), rc );
  93 #else
  94                 Debug( LDAP_DEBUG_ANY,
  95                         "bdb_db_cache: db_create(%s) failed: %s (%d)\n",
  96                         bdb->bi_dbenv_home, db_strerror(rc), rc );
  97 #endif
  98                 ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
  99                 return rc;
 100         }
 101
 102         rc = db->bdi_db->set_pagesize( db->bdi_db, BDB_PAGESIZE );
 103         rc = db->bdi_db->set_h_hash( db->bdi_db, bdb_db_hash );
 104         rc = db->bdi_db->set_flags( db->bdi_db, DB_DUP | DB_DUPSORT );
 105         rc = db->bdi_db->set_dup_compare( db->bdi_db, bdb_bt_compare );
 106
 107         file = ch_malloc( strlen( name ) + sizeof(BDB_SUFFIX) );
 108         sprintf( file, "%s" BDB_SUFFIX, name );
 109
 110 #ifdef HAVE_EBCDIC
 111         __atoe( file );
 112 #endif
 113         rc = DB_OPEN( db->bdi_db,
 114                 file, name,
 115                 DB_HASH, bdb->bi_db_opflags | DB_CREATE | DB_THREAD,
 116                 bdb->bi_dbenv_mode );
 117
 118         ch_free( file );
 119
 120         if( rc != 0 ) {
 121 #ifdef NEW_LOGGING
 122                 LDAP_LOG ( CACHE, ERR,
 123                         "bdb_db_cache: db_open(%s) failed: %s (%d)\n",
 124                         name, db_strerror(rc), rc );
 125 #else
 126                 Debug( LDAP_DEBUG_ANY,
 127                         "bdb_db_cache: db_open(%s) failed: %s (%d)\n",
 128                         name, db_strerror(rc), rc );
 129 #endif
 130                 ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
 131                 return rc;
 132         }
 133
 134         bdb->bi_databases[i+1] = NULL;
 135         bdb->bi_databases[i] = db;
 136         bdb->bi_ndatabases = i+1;
 137
 138         *dbout = db->bdi_db;
 139
 140         ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
 141         return 0;
 142 }