git.sur5r.net Git - openldap/blob - servers/slapd/back-bdb2/porter.c

   1 /* porter.c - port functions of the bdb2 backend */
   2 /* $OpenLDAP$ */
   3
   4 #include "portable.h"
   5
   6 #include <stdio.h>
   7 #include <ac/errno.h>
   8
   9 #include <ac/string.h>
  10
  11 #include "slap.h"
  12 #include "back-bdb2.h"
  13
  14 #define  PORTER_OBJ   "bdb2_backend"
  15
  16
  17 int
  18 bdb2i_enter_backend_rw( DB_LOCK *lock, int writer )
  19 {
  20         u_int32_t      locker;
  21         db_lockmode_t  lock_type;
  22         DBT            lock_dbt;
  23         int            ret = 0;
  24
  25         switch ( slapMode & SLAP_MODE ) {
  26
  27                 case SLAP_SERVER_MODE:
  28                 case SLAP_TOOL_MODE:
  29                         if ( ( ret = lock_id( bdb2i_dbEnv.lk_info, &locker )) != 0 ) {
  30
  31                                 Debug( LDAP_DEBUG_ANY,
  32                                         "bdb2i_enter_backend(): unable to get locker id -- %s\n",
  33                                         strerror( ret ), 0, 0 );
  34                                 return( ret );
  35
  36                         }
  37
  38                         lock_type     = writer ? DB_LOCK_WRITE : DB_LOCK_READ;
  39                         lock_dbt.data = PORTER_OBJ;
  40                         lock_dbt.size = strlen( PORTER_OBJ );
  41
  42                         switch ( ( ret = lock_get( bdb2i_dbEnv.lk_info, locker, 0,
  43                                                                 &lock_dbt, lock_type, lock ))) {
  44
  45                                 case 0:
  46                                         Debug( LDAP_DEBUG_TRACE,
  47                                                 "bdb2i_enter_backend() -- %s lock granted\n",
  48                                                 writer ? "write" : "read", 0, 0 );
  49                                         break;
  50
  51                                 case DB_LOCK_NOTGRANTED:
  52                                         Debug( LDAP_DEBUG_ANY,
  53                                                 "bdb2i_enter_backend() -- %s lock NOT granted\n",
  54                                                 writer ? "write" : "read", 0, 0 );
  55                                         break;
  56
  57                                 case DB_LOCK_DEADLOCK:
  58                                         Debug( LDAP_DEBUG_ANY,
  59                                                 "bdb2i_enter_backend() -- %s lock returned DEADLOCK\n",
  60                                                 writer ? "write" : "read", 0, 0 );
  61                                         break;
  62
  63                                 default:
  64                                         ret = errno;
  65                                         Debug( LDAP_DEBUG_ANY,
  66                                                 "bdb2i_enter_backend() -- %s lock returned ERROR: %s\n",
  67                                                 writer ? "write" : "read", strerror( ret ), 0 );
  68                                         break;
  69
  70                         }
  71                         break;
  72         }
  73
  74         /*  if we are a writer and we have the backend lock,
  75                 start transaction control  */
  76         if ( writer && ( ret == 0 )) {
  77
  78                 ret = bdb2i_start_transction( bdb2i_dbEnv.tx_info );
  79
  80         }
  81
  82         return( ret );
  83 }
  84
  85
  86 int
  87 bdb2i_leave_backend_rw( DB_LOCK lock, int writer )
  88 {
  89         /*  since one or more error can occure,
  90                 we must have several return codes that are or'ed at the end  */
  91         int   ret_transaction = 0;
  92         int   ret_lock        = 0;
  93
  94         /*  if we are a writer, finish the transaction  */
  95         if ( writer ) {
  96
  97                 ret_transaction = bdb2i_finish_transaction();
  98
  99         }
 100
 101         /*  check whether checkpointing is needed  */
 102         ret_transaction |= bdb2i_set_txn_checkpoint( bdb2i_dbEnv.tx_info, 0 );
 103
 104         /*  now release the lock  */
 105         switch ( slapMode & SLAP_MODE ) {
 106
 107                 case SLAP_SERVER_MODE:
 108                 case SLAP_TOOL_MODE:
 109                         switch( ( ret_lock = lock_put( bdb2i_dbEnv.lk_info, lock ))) {
 110
 111                                 case 0:
 112                                         Debug( LDAP_DEBUG_TRACE,
 113                                                 "bdb2i_leave_backend() -- %s lock released\n",
 114                                                 writer ? "write" : "read", 0, 0 );
 115                                         break;
 116
 117                                 case DB_LOCK_NOTHELD:
 118                                         Debug( LDAP_DEBUG_ANY,
 119                                                 "bdb2i_leave_backend() -- %s lock NOT held\n",
 120                                                 writer ? "write" : "read", 0, 0 );
 121                                         break;
 122
 123                                 case DB_LOCK_DEADLOCK:
 124                                         Debug( LDAP_DEBUG_ANY,
 125                                                 "bdb2i_leave_backend() -- %s lock returned DEADLOCK\n",
 126                                                 writer ? "write" : "read", 0, 0 );
 127                                         break;
 128
 129                                 default:
 130                                         ret_lock = errno;
 131                                         Debug( LDAP_DEBUG_ANY,
 132                                                 "bdb2i_leave_backend() -- %s lock returned ERROR: %s\n",
 133                                                 writer ? "write" : "read", strerror( ret_lock ), 0 );
 134                                         break;
 135
 136                         }
 137                         break;
 138         }
 139
 140         return( ret_transaction | ret_lock );
 141 }
 142
 143