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ebc8bb0d83
Make sure only one thread tries to load a given entry at a time. Bump up the DB environment's max TXNs to accomodate the new TXNs.
248 lines
6.7 KiB
C
248 lines
6.7 KiB
C
/* back-bdb.h - bdb back-end header file */
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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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#ifndef _BACK_BDB_H_
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#define _BACK_BDB_H_
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#include <portable.h>
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#include "slap.h"
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#include <db.h>
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LDAP_BEGIN_DECL
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#define BDB_SUBENTRIES 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 BDB_TXN_RETRIES 16
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#define BDB_MAX_ADD_LOOP 30
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#define BDB_ALIASES 1
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#ifdef BDB_SUBDIRS
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#define BDB_TMP_SUBDIR "tmp"
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#define BDB_LG_SUBDIR "log"
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#define BDB_DATA_SUBDIR "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. Smaller pages are better for concurrency.
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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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#ifndef BDB_PAGESIZE
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#define BDB_PAGESIZE 4096 /* BDB's original default */
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#endif
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#define DEFAULT_CACHE_SIZE 1000
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/* The default search IDL stack cache depth */
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#define DEFAULT_SEARCH_STACK_DEPTH 16
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/* The minimum we can function with */
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#define MINIMUM_SEARCH_STACK_DEPTH 8
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typedef struct bdb_idl_cache_entry_s {
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struct berval kstr;
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ldap_pvt_thread_rdwr_t idl_entry_rwlock;
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ID *idl;
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DB *db;
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struct bdb_idl_cache_entry_s* idl_lru_prev;
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struct bdb_idl_cache_entry_s* idl_lru_next;
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} bdb_idl_cache_entry_t;
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/* BDB backend specific entry info */
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typedef struct bdb_entry_info {
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struct bdb_entry_info *bei_parent;
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ID bei_id;
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/* we use the bei_id as a lockobj, but we need to make the size != 4
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* to avoid conflicting with BDB's internal locks. So add a byte here
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* that is always zero.
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*/
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char bei_lockpad;
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short bei_state;
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#define CACHE_ENTRY_DELETED 1
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#define CACHE_ENTRY_NO_KIDS 2
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#define CACHE_ENTRY_NOT_LINKED 4
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#define CACHE_ENTRY_NO_GRANDKIDS 8
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#define CACHE_ENTRY_LOADING 0x10
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/*
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* remaining fields require backend cache lock to access
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*/
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struct berval bei_nrdn;
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#ifdef BDB_HIER
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struct berval bei_rdn;
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int bei_modrdns; /* track renames */
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int bei_ckids; /* number of kids cached */
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int bei_dkids; /* number of kids on-disk, plus 1 */
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#endif
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Entry *bei_e;
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Avlnode *bei_kids;
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ldap_pvt_thread_mutex_t bei_kids_mutex;
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struct bdb_entry_info *bei_lrunext; /* for cache lru list */
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struct bdb_entry_info *bei_lruprev;
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} EntryInfo;
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#undef BEI
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#define BEI(e) ((EntryInfo *) ((e)->e_private))
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/* for the in-core cache of entries */
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typedef struct bdb_cache {
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int c_maxsize;
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int c_cursize;
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EntryInfo c_dntree;
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EntryInfo *c_eifree; /* free list */
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Avlnode *c_idtree;
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EntryInfo *c_lruhead; /* lru - add accessed entries here */
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EntryInfo *c_lrutail; /* lru - rem lru entries from here */
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ldap_pvt_thread_rdwr_t c_rwlock;
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ldap_pvt_thread_mutex_t lru_mutex;
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u_int32_t c_locker; /* used by lru cleaner */
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} Cache;
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#define CACHE_READ_LOCK 0
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#define CACHE_WRITE_LOCK 1
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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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int bi_db_opflags; /* db-specific flags */
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slap_mask_t bi_defaultmask;
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Cache bi_cache;
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Avlnode *bi_attrs;
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void *bi_search_stack;
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int bi_search_stack_depth;
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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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int bi_lock_detect;
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long bi_shm_key;
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ID bi_lastid;
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ldap_pvt_thread_mutex_t bi_lastid_mutex;
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LDAP_LIST_HEAD(pl, slap_op) bi_psearch_list;
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ldap_pvt_thread_rdwr_t bi_pslist_rwlock;
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LDAP_LIST_HEAD(se, slap_session_entry) bi_session_list;
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int bi_idl_cache_max_size;
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int bi_idl_cache_size;
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Avlnode *bi_idl_tree;
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bdb_idl_cache_entry_t *bi_idl_lru_head;
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bdb_idl_cache_entry_t *bi_idl_lru_tail;
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ldap_pvt_thread_rdwr_t bi_idl_tree_rwlock;
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ldap_pvt_thread_mutex_t bi_idl_tree_lrulock;
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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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DB_LOCK boi_lock; /* used when no txn */
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u_int32_t boi_err;
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u_int32_t boi_locker;
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int boi_acl_cache;
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};
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#define DB_OPEN(db, file, name, type, flags, mode) \
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(db)->open(db, file, name, type, flags, mode)
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#if DB_VERSION_MAJOR < 4
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#define LOCK_DETECT(env,f,t,a) lock_detect(env, f, t, a)
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#define LOCK_GET(env,i,f,o,m,l) lock_get(env, i, f, o, m, l)
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#define LOCK_PUT(env,l) lock_put(env, l)
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#define TXN_CHECKPOINT(env,k,m,f) txn_checkpoint(env, k, m, f)
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#define TXN_BEGIN(env,p,t,f) txn_begin((env), p, t, f)
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#define TXN_PREPARE(txn,gid) txn_prepare((txn), (gid))
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#define TXN_COMMIT(txn,f) txn_commit((txn), (f))
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#define TXN_ABORT(txn) txn_abort((txn))
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#define TXN_ID(txn) txn_id(txn)
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#define XLOCK_ID(env, locker) lock_id(env, locker)
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#define XLOCK_ID_FREE(env, locker) lock_id_free(env, locker)
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#else
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#define LOCK_DETECT(env,f,t,a) (env)->lock_detect(env, f, t, a)
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#define LOCK_GET(env,i,f,o,m,l) (env)->lock_get(env, i, f, o, m, l)
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#define LOCK_PUT(env,l) (env)->lock_put(env, l)
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#define TXN_CHECKPOINT(env,k,m,f) (env)->txn_checkpoint(env, k, m, f)
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#define TXN_BEGIN(env,p,t,f) (env)->txn_begin((env), p, t, f)
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#define TXN_PREPARE(txn,g) (txn)->prepare((txn), (g))
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#define TXN_COMMIT(txn,f) (txn)->commit((txn), (f))
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#define TXN_ABORT(txn) (txn)->abort((txn))
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#define TXN_ID(txn) (txn)->id(txn)
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#define XLOCK_ID(env, locker) (env)->lock_id(env, locker)
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#define XLOCK_ID_FREE(env, locker) (env)->lock_id_free(env, locker)
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/* BDB 4.1.17 adds txn arg to db->open */
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#if DB_VERSION_MINOR > 1 || DB_VERSION_PATCH >= 17
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#undef DB_OPEN
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#define DB_OPEN(db, file, name, type, flags, mode) \
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(db)->open(db, NULL, file, name, type, (flags)|DB_AUTO_COMMIT, mode)
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#endif
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#endif
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#define BDB_REUSE_LOCKERS
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#define BDB_CSN_COMMIT 0
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#define BDB_CSN_ABORT 1
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#define BDB_CSN_RETRY 2
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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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