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         DB_TXN *tid,
  50         const char *name,
  51         DB **dbout )
  52 {
  53         int i;
  54         int rc;
  55         struct bdb_info *bdb = (struct bdb_info *) be->be_private;
  56         struct bdb_db_info *db;
  57         char *file;
  58
  59         *dbout = NULL;
  60
  61         for( i=BDB_NDB; bdb->bi_databases[i]; i++ ) {
  62                 if( !strcmp( bdb->bi_databases[i]->bdi_name, name) ) {
  63                         *dbout = bdb->bi_databases[i]->bdi_db;
  64                         return 0;
  65                 }
  66         }
  67
  68         ldap_pvt_thread_mutex_lock( &bdb->bi_database_mutex );
  69
  70         /* check again! may have been added by another thread */
  71         for( i=BDB_NDB; bdb->bi_databases[i]; i++ ) {
  72                 if( !strcmp( bdb->bi_databases[i]->bdi_name, name) ) {
  73                         *dbout = bdb->bi_databases[i]->bdi_db;
  74                         ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
  75                         return 0;
  76                 }
  77         }
  78
  79         if( i >= BDB_INDICES ) {
  80                 ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
  81                 return -1;
  82         }
  83
  84         db = (struct bdb_db_info *) ch_calloc(1, sizeof(struct bdb_db_info));
  85
  86         db->bdi_name = ch_strdup( name );
  87
  88         rc = db_create( &db->bdi_db, bdb->bi_dbenv, 0 );
  89         if( rc != 0 ) {
  90 #ifdef NEW_LOGGING
  91                 LDAP_LOG ( CACHE, ERR,
  92                         "bdb_db_cache: db_create(%s) failed: %s (%d)\n",
  93                         bdb->bi_dbenv_home, db_strerror(rc), rc );
  94 #else
  95                 Debug( LDAP_DEBUG_ANY,
  96                         "bdb_db_cache: db_create(%s) failed: %s (%d)\n",
  97                         bdb->bi_dbenv_home, db_strerror(rc), rc );
  98 #endif
  99                 ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
 100                 return rc;
 101         }
 102
 103         rc = db->bdi_db->set_pagesize( db->bdi_db, BDB_PAGESIZE );
 104         rc = db->bdi_db->set_h_hash( db->bdi_db, bdb_db_hash );
 105         rc = db->bdi_db->set_flags( db->bdi_db, DB_DUP | DB_DUPSORT );
 106         rc = db->bdi_db->set_dup_compare( db->bdi_db, bdb_bt_compare );
 107
 108         file = ch_malloc( strlen( name ) + sizeof(BDB_SUFFIX) );
 109         sprintf( file, "%s" BDB_SUFFIX, name );
 110
 111 #ifdef HAVE_EBCDIC
 112         __atoe( file );
 113 #endif
 114         rc = DB_OPEN( db->bdi_db, tid,
 115                 file, name,
 116                 DB_HASH, bdb->bi_db_opflags | DB_CREATE | DB_THREAD,
 117                 bdb->bi_dbenv_mode );
 118
 119         ch_free( file );
 120
 121         if( rc != 0 ) {
 122 #ifdef NEW_LOGGING
 123                 LDAP_LOG ( CACHE, ERR,
 124                         "bdb_db_cache: db_open(%s) failed: %s (%d)\n",
 125                         name, db_strerror(rc), rc );
 126 #else
 127                 Debug( LDAP_DEBUG_ANY,
 128                         "bdb_db_cache: db_open(%s) failed: %s (%d)\n",
 129                         name, db_strerror(rc), rc );
 130 #endif
 131                 ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
 132                 return rc;
 133         }
 134
 135         bdb->bi_databases[i+1] = NULL;
 136         bdb->bi_databases[i] = db;
 137         bdb->bi_ndatabases = i+1;
 138
 139         *dbout = db->bdi_db;
 140
 141         ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
 142         return 0;
 143 }