db2/txn/txn_rec.c

   1 /*-
   2  * See the file LICENSE for redistribution information.
   3  *
   4  * Copyright (c) 1996, 1997, 1998
   5  *      Sleepycat Software.  All rights reserved.
   6  */
   7 /*
   8  * Copyright (c) 1996
   9  *      The President and Fellows of Harvard University.  All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  * 4. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  */
  39
  40 #include "config.h"
  41
  42 #ifndef lint
  43 static const char sccsid[] = "@(#)txn_rec.c     10.11 (Sleepycat) 5/3/98";
  44 #endif /* not lint */
  45
  46 #ifndef NO_SYSTEM_INCLUDES
  47 #include <sys/types.h>
  48
  49 #include <errno.h>
  50 #endif
  51
  52 #include "db_int.h"
  53 #include "db_page.h"
  54 #include "shqueue.h"
  55 #include "txn.h"
  56 #include "db_am.h"
  57
  58 /*
  59  * PUBLIC: int __txn_regop_recover
  60  * PUBLIC:     __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
  61  */
  62 int
  63 __txn_regop_recover(logp, dbtp, lsnp, redo, info)
  64         DB_LOG *logp;
  65         DBT *dbtp;
  66         DB_LSN *lsnp;
  67         int redo;
  68         void *info;
  69 {
  70         __txn_regop_args *argp;
  71         int ret;
  72
  73 #ifdef DEBUG_RECOVER
  74         (void)__txn_regop_print(logp, dbtp, lsnp, redo, info);
  75 #endif
  76         COMPQUIET(redo, 0);
  77         COMPQUIET(logp, NULL);
  78
  79         if ((ret = __txn_regop_read(dbtp->data, &argp)) != 0)
  80                 return (ret);
  81
  82         switch (argp->opcode) {
  83         case TXN_COMMIT:
  84                 if (__db_txnlist_find(info,
  85                     argp->txnid->txnid) == DB_NOTFOUND)
  86                         __db_txnlist_add(info, argp->txnid->txnid);
  87                 break;
  88         case TXN_PREPARE:       /* Nothing to do. */
  89                 /* Call __db_txnlist_find so that we update the maxid. */
  90                 (void)__db_txnlist_find(info, argp->txnid->txnid);
  91                 break;
  92         default:
  93                 ret = EINVAL;
  94                 break;
  95         }
  96
  97         *lsnp = argp->prev_lsn;
  98         __db_free(argp);
  99         return (0);
 100 }
 101
 102 /*
 103  * PUBLIC: int __txn_ckp_recover __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
 104  */
 105 int
 106 __txn_ckp_recover(logp, dbtp, lsnp, redo, info)
 107         DB_LOG *logp;
 108         DBT *dbtp;
 109         DB_LSN *lsnp;
 110         int redo;
 111         void *info;
 112 {
 113         __txn_ckp_args *argp;
 114         int ret;
 115
 116 #ifdef DEBUG_RECOVER
 117         __txn_ckp_print(logp, dbtp, lsnp, redo, info);
 118 #endif
 119         COMPQUIET(logp, NULL);
 120
 121         if ((ret = __txn_ckp_read(dbtp->data, &argp)) != 0)
 122                 return (ret);
 123
 124         /*
 125          * Check for 'restart' checkpoint record.  This occurs when the
 126          * checkpoint lsn is equal to the lsn of the checkpoint record
 127          * and means that we could set the transaction ID back to 1, so
 128          * that we don't exhaust the transaction ID name space.
 129          */
 130         if (argp->ckp_lsn.file == lsnp->file &&
 131             argp->ckp_lsn.offset == lsnp->offset)
 132                 __db_txnlist_gen(info, redo ? -1 : 1);
 133         *lsnp = argp->last_ckp;
 134         __db_free(argp);
 135         return (DB_TXN_CKP);
 136 }