144 lines
3.5 KiB
C
144 lines
3.5 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1996, 1997
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* Sleepycat Software. All rights reserved.
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*/
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#include "config.h"
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1997\n\
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Sleepycat Software Inc. All rights reserved.\n";
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static const char sccsid[] = "@(#)db_apprec.c 10.15 (Sleepycat) 7/27/97";
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#endif
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#ifndef NO_SYSTEM_INCLUDES
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#include <sys/types.h>
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#include <time.h>
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#include <string.h>
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#endif
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#include "db_int.h"
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#include "shqueue.h"
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#include "db_page.h"
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#include "db_dispatch.h"
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#include "db_am.h"
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#include "log.h"
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#include "txn.h"
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#include "common_ext.h"
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/*
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* __db_apprec --
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* Perform recovery.
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*
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* PUBLIC: int __db_apprec __P((DB_ENV *, int));
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*/
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int
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__db_apprec(dbenv, flags)
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DB_ENV *dbenv;
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int flags;
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{
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DBT data;
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DB_LOG *lp;
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DB_LSN ckp_lsn, first_lsn, lsn, tmp_lsn;
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time_t now;
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int first_flag, ret, tret;
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void *txninfo;
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ZERO_LSN(ckp_lsn);
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/* Initialize the transaction list. */
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if ((ret = __db_txnlist_init(&txninfo)) != 0)
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return (ret);
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/*
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* Read forward through the log opening the appropriate files
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* so that we can call recovery routines. In general, we start
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* at the last checkpoint prior to the last checkpointed LSN.
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* For catastrophic recovery, we begin at the first LSN that
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* appears in any log file (log figures this out for us when
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* we pass it the DB_FIRST flag).
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*/
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lp = dbenv->lg_info;
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if (LF_ISSET(DB_RECOVER_FATAL))
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first_flag = DB_FIRST;
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else
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first_flag = __log_findckp(lp, &lsn) != 0 ? DB_FIRST : DB_SET;
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memset(&data, 0, sizeof(data));
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if ((ret = log_get(lp, &lsn, &data, first_flag)) != 0) {
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__db_err(dbenv, "Failure: unable to get log record");
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if (first_flag == DB_SET)
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__db_err(dbenv, "Retrieving LSN %lu %lu",
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(u_long)lsn.file, (u_long)lsn.offset);
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else
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__db_err(dbenv, "Retrieving first LSN");
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goto err;
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}
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first_lsn = lsn;
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for (; ret == 0;
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ret = log_get(dbenv->lg_info, &lsn, &data, DB_NEXT))
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if ((tret = __db_dispatch(lp,
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&data, &lsn, TXN_OPENFILES, txninfo)) < 0) {
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ret = tret;
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goto msgerr;
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}
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for (ret = log_get(lp, &lsn, &data, DB_LAST);
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ret == 0 && log_compare(&lsn, &first_lsn) > 0;
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ret = log_get(lp,&lsn, &data, DB_PREV)) {
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tmp_lsn = lsn;
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tret =
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__db_dispatch(lp, &data, &lsn, TXN_BACKWARD_ROLL, txninfo);
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if (IS_ZERO_LSN(ckp_lsn) && tret > 0)
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ckp_lsn = tmp_lsn;
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if (tret < 0) {
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ret = tret;
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goto msgerr;
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}
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}
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for (ret = log_get(lp, &lsn, &data, DB_NEXT);
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ret == 0; ret = log_get(lp, &lsn, &data, DB_NEXT))
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if ((tret = __db_dispatch(lp,
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&data, &lsn, TXN_FORWARD_ROLL, txninfo)) < 0) {
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ret = tret;
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goto msgerr;
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}
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/* Now close all the db files that are open. */
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__log_close_files(lp);
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/*
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* Now set the maximum transaction id, set the last checkpoint lsn,
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* and the current time. Then take a checkpoint.
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*/
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(void)time(&now);
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dbenv->tx_info->region->last_txnid = ((__db_txnhead *)txninfo)->maxid;
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dbenv->tx_info->region->last_ckp = ckp_lsn;
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dbenv->tx_info->region->time_ckp = (u_int32_t) now;
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txn_checkpoint(dbenv->tx_info, 0, 0);
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if (dbenv->db_verbose) {
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__db_err(lp->dbenv, "Recovery complete at %s", ctime(&now));
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__db_err(lp->dbenv, "%s %lu %s [%lu][%lu]",
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"Maximum transaction id",
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(u_long)dbenv->tx_info->region->last_txnid,
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"Recovery checkpoint",
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(u_long)dbenv->tx_info->region->last_ckp.file,
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(u_long)dbenv->tx_info->region->last_ckp.offset);
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}
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return (0);
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msgerr: __db_err(dbenv, "Recovery function for LSN %lu %lu failed",
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(u_long)lsn.file, (u_long)lsn.offset);
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err: return (ret);
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}
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