1 /* back-ldbm.h - ldap ldbm back-end header file */
4 * Copyright 1998-2003 The OpenLDAP Foundation, All Rights Reserved.
5 * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
15 #define LDBM_SUBENTRIES 1
17 #define DEFAULT_CACHE_SIZE 1000
19 #if defined(HAVE_BERKELEY_DB) && DB_VERSION_MAJOR >= 2
20 # define DEFAULT_DBCACHE_SIZE (100 * DEFAULT_DB_PAGE_SIZE)
22 # define DEFAULT_DBCACHE_SIZE 100000
25 #define DN_BASE_PREFIX SLAP_INDEX_EQUALITY_PREFIX
26 #define DN_ONE_PREFIX '%'
27 #define DN_SUBTREE_PREFIX '@'
30 * there is a single index for each attribute. these prefixes ensure
31 * that there is no collision among keys.
34 /* allow PREFIX + byte for continuate number */
35 #define SLAP_INDEX_CONT_SIZE ( sizeof(SLAP_INDEX_CONT_PREFIX) + sizeof(unsigned char) )
37 #define DEFAULT_BLOCKSIZE 8192
40 * This structure represents an id block on disk and an id list
43 * The fields have the following meanings:
45 * b_nmax maximum number of ids in this block. if this is == ALLIDSBLOCK,
46 * then this block represents all ids.
47 * b_nids current number of ids in use in this block. if this
48 * is == INDBLOCK, then this block is an indirect block
49 * containing a list of other blocks containing actual ids.
50 * the list is terminated by an id of NOID.
51 * b_ids a list of the actual ids themselves
56 #define ID_BLOCK_NMAX_OFFSET 0
57 #define ID_BLOCK_NIDS_OFFSET 1
58 #define ID_BLOCK_IDS_OFFSET 2
60 /* all ID_BLOCK macros operate on a pointer to a ID_BLOCK */
62 #define ID_BLOCK_NMAX(b) ((b)[ID_BLOCK_NMAX_OFFSET])
64 /* Use this macro to get the value, but not to set it.
65 * By default this is identical to above.
67 #define ID_BLOCK_NMAXN(b) ID_BLOCK_NMAX(b)
68 #define ID_BLOCK_NIDS(b) ((b)[ID_BLOCK_NIDS_OFFSET])
69 #define ID_BLOCK_ID(b, n) ((b)[ID_BLOCK_IDS_OFFSET+(n)])
71 #define ID_BLOCK_NOID(b, n) (ID_BLOCK_ID((b),(n)) == NOID)
73 #define ID_BLOCK_ALLIDS_VALUE 0
74 #define ID_BLOCK_ALLIDS(b) (ID_BLOCK_NMAX(b) == ID_BLOCK_ALLIDS_VALUE)
76 #define ID_BLOCK_INDIRECT_VALUE 0
77 #define ID_BLOCK_INDIRECT(b) (ID_BLOCK_NIDS(b) == ID_BLOCK_INDIRECT_VALUE)
79 #define USE_INDIRECT_NIDS 1
81 #ifdef USE_INDIRECT_NIDS
83 * Use the high bit of ID_BLOCK_NMAX to indicate an INDIRECT block, thus
84 * freeing up the ID_BLOCK_NIDS to store an actual count. This allows us
85 * to use binary search on INDIRECT blocks.
88 #define ID_BLOCK_NMAXN(b) ((b)[ID_BLOCK_NMAX_OFFSET]&0x7fffffff)
89 #undef ID_BLOCK_INDIRECT_VALUE
90 #define ID_BLOCK_INDIRECT_VALUE 0x80000000
91 #undef ID_BLOCK_INDIRECT
92 #define ID_BLOCK_INDIRECT(b) (ID_BLOCK_NMAX(b) & ID_BLOCK_INDIRECT_VALUE)
94 #endif /* USE_INDIRECT_NIDS */
96 /* for the in-core cache of entries */
97 typedef struct ldbm_cache {
102 Entry *c_lruhead; /* lru - add accessed entries here */
103 Entry *c_lrutail; /* lru - rem lru entries from here */
104 ldap_pvt_thread_mutex_t c_mutex;
107 #define CACHE_READ_LOCK 0
108 #define CACHE_WRITE_LOCK 1
110 /* for the cache of open index files */
111 typedef struct ldbm_dbcache {
121 ldap_pvt_thread_mutex_t dbc_write_mutex;
124 #define MAXDBCACHE 128
127 ldap_pvt_thread_rdwr_t li_giant_rwlock;
130 slap_mask_t li_defaultmask;
134 int li_dblocking; /* lock databases */
135 int li_dbwritesync; /* write sync */
137 DBCache li_dbcache[MAXDBCACHE];
138 ldap_pvt_thread_mutex_t li_dbcache_mutex;
139 ldap_pvt_thread_cond_t li_dbcache_cv;
144 int li_dbsyncwaitinterval;
145 ldap_pvt_thread_t li_dbsynctid;
151 #include "proto-back-ldbm.h"
153 #endif /* _back_ldbm_h_ */