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   1 /* back-ldbm.h - ldap ldbm back-end header file */
   2 /* $OpenLDAP$ */
   3 /*
   4  * Copyright 1998-2003 The OpenLDAP Foundation, All Rights Reserved.
   5  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   6  */
   7
   8 #ifndef _BACK_LDBM_H_
   9 #define _BACK_LDBM_H_
  10
  11 #include "ldbm.h"
  12
  13 LDAP_BEGIN_DECL
  14
  15 #define DEFAULT_CACHE_SIZE      1000
  16
  17 #if defined(HAVE_BERKELEY_DB) && DB_VERSION_MAJOR >= 2
  18 #       define DEFAULT_DBCACHE_SIZE (100 * DEFAULT_DB_PAGE_SIZE)
  19 #else
  20 #       define DEFAULT_DBCACHE_SIZE 100000
  21 #endif
  22
  23 #define DN_BASE_PREFIX          SLAP_INDEX_EQUALITY_PREFIX
  24 #define DN_ONE_PREFIX           '%'
  25 #define DN_SUBTREE_PREFIX       '@'
  26
  27 /*
  28  * there is a single index for each attribute.  these prefixes ensure
  29  * that there is no collision among keys.
  30  */
  31
  32 /* allow PREFIX + byte for continuate number */
  33 #define SLAP_INDEX_CONT_SIZE ( sizeof(SLAP_INDEX_CONT_PREFIX) + sizeof(unsigned char) )
  34
  35 #define DEFAULT_BLOCKSIZE       8192
  36
  37 /*
  38  * This structure represents an id block on disk and an id list
  39  * in core.
  40  *
  41  * The fields have the following meanings:
  42  *
  43  *      b_nmax  maximum number of ids in this block. if this is == ALLIDSBLOCK,
  44  *              then this block represents all ids.
  45  *      b_nids  current number of ids in use in this block.  if this
  46  *              is == INDBLOCK, then this block is an indirect block
  47  *              containing a list of other blocks containing actual ids.
  48  *              the list is terminated by an id of NOID.
  49  *      b_ids   a list of the actual ids themselves
  50  */
  51
  52 typedef ID ID_BLOCK;
  53
  54 #define ID_BLOCK_NMAX_OFFSET    0
  55 #define ID_BLOCK_NIDS_OFFSET    1
  56 #define ID_BLOCK_IDS_OFFSET             2
  57
  58 /* all ID_BLOCK macros operate on a pointer to a ID_BLOCK */
  59
  60 #define ID_BLOCK_NMAX(b)                ((b)[ID_BLOCK_NMAX_OFFSET])
  61
  62 /* Use this macro to get the value, but not to set it.
  63  * By default this is identical to above.
  64  */
  65 #define ID_BLOCK_NMAXN(b)               ID_BLOCK_NMAX(b)
  66 #define ID_BLOCK_NIDS(b)                ((b)[ID_BLOCK_NIDS_OFFSET])
  67 #define ID_BLOCK_ID(b, n)               ((b)[ID_BLOCK_IDS_OFFSET+(n)])
  68
  69 #define ID_BLOCK_NOID(b, n)             (ID_BLOCK_ID((b),(n)) == NOID)
  70
  71 #define ID_BLOCK_ALLIDS_VALUE   0
  72 #define ID_BLOCK_ALLIDS(b)              (ID_BLOCK_NMAX(b) == ID_BLOCK_ALLIDS_VALUE)
  73
  74 #define ID_BLOCK_INDIRECT_VALUE 0
  75 #define ID_BLOCK_INDIRECT(b)    (ID_BLOCK_NIDS(b) == ID_BLOCK_INDIRECT_VALUE)
  76
  77 #define USE_INDIRECT_NIDS       1
  78
  79 #ifdef USE_INDIRECT_NIDS
  80 /*
  81  * Use the high bit of ID_BLOCK_NMAX to indicate an INDIRECT block, thus
  82  * freeing up the ID_BLOCK_NIDS to store an actual count. This allows us
  83  * to use binary search on INDIRECT blocks.
  84  */
  85 #undef  ID_BLOCK_NMAXN
  86 #define ID_BLOCK_NMAXN(b)               ((b)[ID_BLOCK_NMAX_OFFSET]&0x7fffffff)
  87 #undef  ID_BLOCK_INDIRECT_VALUE
  88 #define ID_BLOCK_INDIRECT_VALUE 0x80000000
  89 #undef  ID_BLOCK_INDIRECT
  90 #define ID_BLOCK_INDIRECT(b)    (ID_BLOCK_NMAX(b) & ID_BLOCK_INDIRECT_VALUE)
  91
  92 #endif  /* USE_INDIRECT_NIDS */
  93
  94 /* for the in-core cache of entries */
  95 typedef struct ldbm_cache {
  96         int             c_maxsize;
  97         int             c_cursize;
  98         Avlnode         *c_dntree;
  99         Avlnode         *c_idtree;
 100         Entry           *c_lruhead;     /* lru - add accessed entries here */
 101         Entry           *c_lrutail;     /* lru - rem lru entries from here */
 102         ldap_pvt_thread_mutex_t c_mutex;
 103 } Cache;
 104
 105 #define CACHE_READ_LOCK         0
 106 #define CACHE_WRITE_LOCK        1
 107
 108 /* for the cache of open index files */
 109 typedef struct ldbm_dbcache {
 110         int             dbc_refcnt;
 111         int             dbc_maxids;
 112         int             dbc_maxindirect;
 113         int             dbc_dirty;
 114         int             dbc_flags;
 115         time_t  dbc_lastref;
 116         long    dbc_blksize;
 117         char    *dbc_name;
 118         LDBM    dbc_db;
 119         ldap_pvt_thread_mutex_t dbc_write_mutex;
 120 } DBCache;
 121
 122 #define MAXDBCACHE      128
 123
 124 struct ldbminfo {
 125         ldap_pvt_thread_rdwr_t          li_giant_rwlock;
 126         ID                      li_nextid;
 127         int                     li_mode;
 128         slap_mask_t     li_defaultmask;
 129         char                    *li_directory;
 130         Cache           li_cache;
 131         Avlnode                 *li_attrs;
 132         int                     li_dblocking;   /* lock databases */
 133         int                     li_dbwritesync; /* write sync */
 134         int                     li_dbcachesize;
 135         DBCache         li_dbcache[MAXDBCACHE];
 136         ldap_pvt_thread_mutex_t         li_dbcache_mutex;
 137         ldap_pvt_thread_cond_t          li_dbcache_cv;
 138         DB_ENV                  *li_dbenv;
 139         int                     li_envdirok;
 140         int                     li_dbsyncfreq;
 141         int                     li_dbsyncwaitn;
 142         int                     li_dbsyncwaitinterval;
 143         ldap_pvt_thread_t       li_dbsynctid;
 144         int                     li_dbshutdown;
 145 };
 146
 147 LDAP_END_DECL
 148
 149 #include "proto-back-ldbm.h"
 150
 151 #endif /* _back_ldbm_h_ */