mirror of
https://git.openldap.org/openldap/openldap.git
synced 2024-12-21 03:10:25 +08:00
5c7a7998a9
overflow/fragmentation. (This is now 16K vs default 4K.) It turns out that the entries' on-disk format is quite space-inefficient, storing 4 bytes per pointer or integer when typically >50% of those bytes are zero. Oh well. It's about a 2:1 space increase over ldbm now, vs 4:1 before when all the entries were overflowing the 4K pages.
108 lines
2.2 KiB
C
108 lines
2.2 KiB
C
/* back-bdb.h - bdb back-end header file */
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/* $OpenLDAP$ */
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/*
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* Copyright 2000-2001 The OpenLDAP Foundation, All Rights Reserved.
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* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
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*/
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#ifndef _BACK_BDB_H_
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#define _BACK_BDB_H_
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#include <portable.h>
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#include <db.h>
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#include "slap.h"
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LDAP_BEGIN_DECL
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#define BDB_FILTER_INDICES 1
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#define DN_BASE_PREFIX SLAP_INDEX_EQUALITY_PREFIX
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#define DN_ONE_PREFIX '%'
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#define DN_SUBTREE_PREFIX '@'
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#define DBTzero(t) (memset((t), 0, sizeof(DBT)))
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#define DBT2bv(t,bv) ((bv)->bv_val = (t)->data, \
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(bv)->bv_len = (t)->size)
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#define bv2DBT(bv,t) ((t)->data = (bv)->bv_val, \
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(t)->size = (bv)->bv_len )
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#define DEFAULT_MODE 0600
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#define BDB_TXN_RETRIES 16
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#define BDB_DBENV_HOME LDAP_RUNDIR LDAP_DIRSEP "openldap-bdb"
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#ifdef BDB_SUBDIRS
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#define BDB_TMP_SUBDIR LDAP_DIRSEP "tmp"
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#define BDB_LG_SUBDIR LDAP_DIRSEP "log"
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#define BDB_DATA_SUBDIR LDAP_DIRSEP "data"
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#endif
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#define BDB_SUFFIX ".bdb"
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#define BDB_ID2ENTRY 0
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#define BDB_DN2ID 1
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#define BDB_NDB 2
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/* The bdb on-disk entry format is pretty space-inefficient. Average
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* sized user entries are 3-4K each. You need at least two entries to
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* fit into a single database page, more is better. 64K is BDB's
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* upper bound.
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*/
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#ifndef BDB_ID2ENTRY_PAGESIZE
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#define BDB_ID2ENTRY_PAGESIZE 16384
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#endif
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#define BDB_INDICES 128
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struct bdb_db_info {
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char *bdi_name;
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DB *bdi_db;
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};
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struct bdb_info {
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DB_ENV *bi_dbenv;
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/* DB_ENV parameters */
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/* The DB_ENV can be tuned via DB_CONFIG */
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char *bi_dbenv_home;
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u_int32_t bi_dbenv_xflags; /* extra flags */
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int bi_dbenv_mode;
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int bi_ndatabases;
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struct bdb_db_info **bi_databases;
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ldap_pvt_thread_mutex_t bi_database_mutex;
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slap_mask_t bi_defaultmask;
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Avlnode *bi_attrs;
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int bi_txn;
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int bi_txn_cp;
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u_int32_t bi_txn_cp_min;
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u_int32_t bi_txn_cp_kbyte;
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#ifndef NO_THREADS
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int bi_lock_detect;
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int bi_lock_detect_seconds;
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ldap_pvt_thread_t bi_lock_detect_tid;
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#endif
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ID bi_lastid;
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ldap_pvt_thread_mutex_t bi_lastid_mutex;
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};
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#define bi_id2entry bi_databases[BDB_ID2ENTRY]
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#define bi_dn2id bi_databases[BDB_DN2ID]
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struct bdb_op_info {
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BackendDB* boi_bdb;
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DB_TXN* boi_txn;
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int boi_err;
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};
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LDAP_END_DECL
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#include "proto-bdb.h"
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#endif /* _BACK_BDB_H_ */
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