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synced 2024-12-15 03:01:09 +08:00
35655c056f
Old code applied sync flags to store(), however supported DBMs require such flags to be specified during open(). The new code now applies flags in ldbm_cache_open (which calls ldbm_open). ldbm_cache_close() now calls ldbm_sync(). This will force a updating of on-disk contents after each LDAP operation. The old code either failed to sync the on-disk contents until close or synced on every store. Per LDBM operation syncing *should* be safe enough... real data safety requires transactions. Removed nosync option from BDB2 as it is not compatible with txn support. Also added code to disable DBM level locking as slapd is only process acessing the databases (dbnolocking).
157 lines
4.1 KiB
C
157 lines
4.1 KiB
C
/* back-ldbm.h - ldap ldbm back-end header file */
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/* $OpenLDAP$ */
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/*
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* Copyright 1998-1999 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_LDBM_H_
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#define _BACK_LDBM_H_
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#include "ldbm.h"
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LDAP_BEGIN_DECL
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#define DEFAULT_CACHE_SIZE 1000
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#ifdef HAVE_BERKELEY_DB2
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# define DEFAULT_DBCACHE_SIZE (100 * DEFAULT_DB_PAGE_SIZE)
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#else
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# define DEFAULT_DBCACHE_SIZE 100000
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#endif
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#define DEFAULT_DB_DIRECTORY "/usr/tmp"
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#define DEFAULT_MODE 0600
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#define SUBLEN 3
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#define DN_BASE_PREFIX '='
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#define DN_ONE_PREFIX '@'
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#define DN_SUBTREE_PREFIX '?'
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#define SLAPD_FILTER_DN_ONE ((ber_tag_t) -2)
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#define SLAPD_FILTER_DN_SUBTREE ((ber_tag_t) -3)
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/*
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* there is a single index for each attribute. these prefixes ensure
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* that there is no collision among keys.
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*/
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#define EQ_PREFIX '=' /* prefix for equality keys */
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#define APPROX_PREFIX '~' /* prefix for approx keys */
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#define SUB_PREFIX '*' /* prefix for substring keys */
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#define CONT_PREFIX '\\' /* prefix for continuation keys */
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/* allow 3 characters per byte + PREFIX + EOS */
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#define CONT_SIZE ( sizeof(long)*3 + 1 + 1 )
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#define UNKNOWN_PREFIX '?' /* prefix for unknown keys */
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#define DEFAULT_BLOCKSIZE 8192
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/*
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* This structure represents an id block on disk and an id list
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* in core.
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*
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* The fields have the following meanings:
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*
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* b_nmax maximum number of ids in this block. if this is == ALLIDSBLOCK,
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* then this block represents all ids.
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* b_nids current number of ids in use in this block. if this
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* is == INDBLOCK, then this block is an indirect block
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* containing a list of other blocks containing actual ids.
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* the list is terminated by an id of NOID.
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* b_ids a list of the actual ids themselves
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*/
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typedef ID ID_BLOCK;
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#define ID_BLOCK_NMAX_OFFSET 0
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#define ID_BLOCK_NIDS_OFFSET 1
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#define ID_BLOCK_IDS_OFFSET 2
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/* all ID_BLOCK macros operate on a pointer to a ID_BLOCK */
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#define ID_BLOCK_NMAX(b) ((b)[ID_BLOCK_NMAX_OFFSET])
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#define ID_BLOCK_NIDS(b) ((b)[ID_BLOCK_NIDS_OFFSET])
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#define ID_BLOCK_ID(b, n) ((b)[ID_BLOCK_IDS_OFFSET+(n)])
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#define ID_BLOCK_NOID(b, n) (ID_BLOCK_ID((b),(n)) == NOID)
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#define ID_BLOCK_ALLIDS_VALUE 0
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#define ID_BLOCK_ALLIDS(b) (ID_BLOCK_NMAX(b) == ID_BLOCK_ALLIDS_VALUE)
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#define ID_BLOCK_INDIRECT_VALUE 0
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#define ID_BLOCK_INDIRECT(b) (ID_BLOCK_NIDS(b) == ID_BLOCK_INDIRECT_VALUE)
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/* for the in-core cache of entries */
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typedef struct ldbm_cache {
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int c_maxsize;
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int c_cursize;
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Avlnode *c_dntree;
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Avlnode *c_idtree;
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Entry *c_lruhead; /* lru - add accessed entries here */
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Entry *c_lrutail; /* lru - rem lru entries from here */
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ldap_pvt_thread_mutex_t c_mutex;
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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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/* for the cache of open index files */
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typedef struct ldbm_dbcache {
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int dbc_refcnt;
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int dbc_maxids;
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int dbc_maxindirect;
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time_t dbc_lastref;
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long dbc_blksize;
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char *dbc_name;
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LDBM dbc_db;
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} DBCache;
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/* for the cache of attribute information (which are indexed, etc.) */
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typedef struct ldbm_attrinfo {
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char *ai_type; /* type name (cn, sn, ...) */
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int ai_indexmask; /* how the attr is indexed */
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#define INDEX_PRESENCE 0x0001
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#define INDEX_EQUALITY 0x0002
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#define INDEX_APPROX 0x0004
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#define INDEX_SUB 0x0008
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#define INDEX_UNKNOWN 0x0010
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#define INDEX_FROMINIT 0x1000
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int ai_syntaxmask; /* what kind of syntax */
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/* ...from slap.h...
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#define SYNTAX_CIS 0x01
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#define SYNTAX_CES 0x02
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#define SYNTAX_BIN 0x04
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... etc. ...
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*/
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} AttrInfo;
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#define MAXDBCACHE 16
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struct ldbminfo {
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ID li_nextid;
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ldap_pvt_thread_mutex_t li_nextid_mutex;
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ldap_pvt_thread_mutex_t li_root_mutex;
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ldap_pvt_thread_mutex_t li_add_mutex;
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int li_mode;
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char *li_directory;
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Cache li_cache;
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Avlnode *li_attrs;
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int li_dblocking; /* lock databases */
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int li_dbwritesync; /* write sync */
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int li_dbcachesize;
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DBCache li_dbcache[MAXDBCACHE];
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ldap_pvt_thread_mutex_t li_dbcache_mutex;
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ldap_pvt_thread_cond_t li_dbcache_cv;
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#ifdef HAVE_BERKELEY_DB2
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DB_ENV li_db_env;
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#endif
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};
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LDAP_END_DECL
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#include "proto-back-ldbm.h"
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#endif /* _back_ldbm_h_ */
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