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

   1 /* porter.c - port functions of the bdb2 backend */
   2
   3 #include "portable.h"
   4
   5 #include <stdio.h>
   6 #include <errno.h>
   7
   8 #include <ac/string.h>
   9
  10 #include "slap.h"
  11 #include "back-bdb2.h"
  12
  13 #define  PORTER_OBJ   "bdb2_backend"
  14
  15
  16 int
  17 bdb2i_enter_backend_rw( DB_ENV *dbEnv, DB_LOCK *lock, int writer )
  18 {
  19         u_int32_t      locker;
  20         db_lockmode_t  lock_type;
  21         DBT            lock_dbt;
  22         int            ret = 0;
  23
  24         switch ( slapMode ) {
  25
  26                 case SLAP_SERVER_MODE:
  27                 case SLAP_TIMEDSERVER_MODE:
  28                 case SLAP_TOOL_MODE:
  29                 case SLAP_TOOLID_MODE:
  30                         if ( ( ret = lock_id( dbEnv->lk_info, &locker )) != 0 ) {
  31
  32                                 Debug( LDAP_DEBUG_ANY,
  33                                         "bdb2i_enter_backend(): unable to get locker id -- %s\n",
  34                                         strerror( ret ), 0, 0 );
  35                                 return( ret );
  36
  37                         }
  38
  39                         lock_type     = writer ? DB_LOCK_WRITE : DB_LOCK_READ;
  40                         lock_dbt.data = PORTER_OBJ;
  41                         lock_dbt.size = strlen( PORTER_OBJ );
  42
  43                         switch ( ( ret = lock_get( dbEnv->lk_info, locker, 0, &lock_dbt,
  44                                                         lock_type, lock ))) {
  45
  46                                 case 0:
  47                                         Debug( LDAP_DEBUG_TRACE,
  48                                                 "bdb2i_enter_backend() -- %s lock granted\n",
  49                                                 writer ? "write" : "read", 0, 0 );
  50                                         break;
  51
  52                                 case DB_LOCK_NOTGRANTED:
  53                                         Debug( LDAP_DEBUG_ANY,
  54                                                 "bdb2i_enter_backend() -- %s lock NOT granted\n",
  55                                                 writer ? "write" : "read", 0, 0 );
  56                                         break;
  57
  58                                 case DB_LOCK_DEADLOCK:
  59                                         Debug( LDAP_DEBUG_ANY,
  60                                                 "bdb2i_enter_backend() -- %s lock returned DEADLOCK\n",
  61                                                 writer ? "write" : "read", 0, 0 );
  62                                         break;
  63
  64                                 default:
  65                                         Debug( LDAP_DEBUG_ANY,
  66                                                 "bdb2i_enter_backend() -- %s lock returned ERROR: %s\n",
  67                                                 writer ? "write" : "read", strerror( errno ), 0 );
  68                                         ret = errno;
  69                                         break;
  70
  71                         }
  72                         break;
  73         }
  74
  75         /*  if we are a writer and we have the backend lock,
  76                 start transaction control  */
  77         if ( writer && ( ret == 0 )) {
  78
  79                 ret = bdb2i_start_transction( dbEnv->tx_info );
  80
  81         }
  82
  83         return( ret );
  84 }
  85
  86
  87 int
  88 bdb2i_leave_backend_rw( DB_ENV *dbEnv, DB_LOCK lock, int writer )
  89 {
  90         /*  since one or more error can occure,
  91                 we must have several return codes that are or'ed at the end  */
  92         int   ret_transaction = 0;
  93         int   ret_lock        = 0;
  94         int   ret_chkp        = 0;
  95
  96         /*  if we are a writer, finish the transaction  */
  97         if ( writer ) {
  98
  99                 ret_transaction = bdb2i_finish_transaction();
 100
 101         }
 102
 103         /*  check whether checkpointing is needed  */
 104         ret_transaction |= bdb2i_set_txn_checkpoint( dbEnv->tx_info, 0 );
 105
 106         /*  now release the lock  */
 107         switch ( slapMode ) {
 108
 109                 case SLAP_SERVER_MODE:
 110                 case SLAP_TIMEDSERVER_MODE:
 111                 case SLAP_TOOL_MODE:
 112                 case SLAP_TOOLID_MODE:
 113                         switch( ( ret_lock = lock_put( dbEnv->lk_info, lock ))) {
 114
 115                                 case 0:
 116                                         Debug( LDAP_DEBUG_TRACE,
 117                                                 "bdb2i_leave_backend() -- %s lock released\n",
 118                                                 writer ? "write" : "read", 0, 0 );
 119                                         break;
 120
 121                                 case DB_LOCK_NOTHELD:
 122                                         Debug( LDAP_DEBUG_ANY,
 123                                                 "bdb2i_leave_backend() -- %s lock NOT held\n",
 124                                                 writer ? "write" : "read", 0, 0 );
 125                                         break;
 126
 127                                 case DB_LOCK_DEADLOCK:
 128                                         Debug( LDAP_DEBUG_ANY,
 129                                                 "bdb2i_leave_backend() -- %s lock returned DEADLOCK\n",
 130                                                 writer ? "write" : "read", 0, 0 );
 131                                         break;
 132
 133                                 default:
 134                                         Debug( LDAP_DEBUG_ANY,
 135                                                 "bdb2i_leave_backend() -- %s lock returned ERROR: %s\n",
 136                                                 writer ? "write" : "read", strerror( errno ), 0 );
 137                                         ret_lock = errno;
 138                                         break;
 139
 140                         }
 141                         break;
 142         }
 143
 144         return( ret_transaction | ret_lock );
 145 }
 146
 147