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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997
* Sleepycat Software. All rights reserved.
*/
#include "config.h"
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1997\n\
Sleepycat Software Inc. All rights reserved.\n";
static const char sccsid[] = "@(#)db_apprec.c 10.18 (Sleepycat) 9/30/97";
#endif
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <time.h>
#include <string.h>
#include <stdlib.h>
#endif
#include "db_int.h"
#include "shqueue.h"
#include "db_page.h"
#include "db_dispatch.h"
#include "db_am.h"
#include "log.h"
#include "txn.h"
#include "common_ext.h"
/*
* __db_apprec --
* Perform recovery.
*
* PUBLIC: int __db_apprec __P((DB_ENV *, int));
*/
int
__db_apprec(dbenv, flags)
DB_ENV *dbenv;
int flags;
{
DBT data;
DB_LOG *lp;
DB_LSN ckp_lsn, first_lsn, lsn, tmp_lsn;
time_t now;
int first_flag, is_thread, ret;
void *txninfo;
lp = dbenv->lg_info;
/* Initialize the transaction list. */
if ((ret = __db_txnlist_init(&txninfo)) != 0)
return (ret);
/*
* Save the state of the thread flag -- we don't need it on at the
* moment because we're single-threaded until recovery is complete.
*/
is_thread = F_ISSET(lp, DB_AM_THREAD);
F_CLR(lp, DB_AM_THREAD);
/*
* Read forward through the log, opening the appropriate files so that
* we can call recovery routines. In general, we start at the last
* checkpoint prior to the last checkpointed LSN. For catastrophic
* recovery, we begin at the first LSN that appears in any log file
* (log_get figures this out for us when we pass it the DB_FIRST flag).
*/
if (LF_ISSET(DB_RECOVER_FATAL))
first_flag = DB_FIRST;
else {
if ((ret = __log_findckp(lp, &lsn)) == DB_NOTFOUND) {
F_SET(lp, is_thread);
return (0);
}
first_flag = DB_SET;
}
/* If we're a threaded application, we have to allocate space. */
memset(&data, 0, sizeof(data));
if ((ret = log_get(lp, &lsn, &data, first_flag)) != 0) {
__db_err(dbenv, "Failure: unable to get log record");
if (first_flag == DB_SET)
__db_err(dbenv, "Retrieving LSN %lu %lu",
(u_long)lsn.file, (u_long)lsn.offset);
else
__db_err(dbenv, "Retrieving first LSN");
goto err;
}
first_lsn = lsn;
for (;;) {
ret = __db_dispatch(lp, &data, &lsn, TXN_OPENFILES, txninfo);
if (ret != 0 && ret != DB_TXN_CKP)
goto msgerr;
if ((ret =
log_get(dbenv->lg_info, &lsn, &data, DB_NEXT)) != 0) {
if (ret != DB_NOTFOUND)
goto err;
break;
}
}
/*
* Initialize the ckp_lsn to 0,0. If we never find a valid
* checkpoint in the log, then leaving ckp_lsn at 0,0 is correct.
*/
ZERO_LSN(ckp_lsn);
for (ret = log_get(lp, &lsn, &data, DB_LAST);
ret == 0 && log_compare(&lsn, &first_lsn) > 0;
ret = log_get(lp,&lsn, &data, DB_PREV)) {
tmp_lsn = lsn;
ret = __db_dispatch(lp,
&data, &lsn, TXN_BACKWARD_ROLL, txninfo);
if (ret == DB_TXN_CKP) {
if (IS_ZERO_LSN(ckp_lsn))
ckp_lsn = tmp_lsn;
ret = 0;
} else if (ret != 0)
goto msgerr;
}
if (ret != 0 && ret != DB_NOTFOUND)
goto err;
for (ret = log_get(lp, &lsn, &data, DB_NEXT);
ret == 0; ret = log_get(lp, &lsn, &data, DB_NEXT)) {
ret = __db_dispatch(lp, &data, &lsn, TXN_FORWARD_ROLL, txninfo);
if (ret == DB_TXN_CKP)
ret = 0;
else if (ret != 0)
goto msgerr;
}
if (ret != DB_NOTFOUND)
goto err;
/* Now close all the db files that are open. */
__log_close_files(lp);
/*
* Now set the maximum transaction id, set the last checkpoint lsn,
* and the current time. Then take a checkpoint.
*/
(void)time(&now);
dbenv->tx_info->region->last_txnid = ((__db_txnhead *)txninfo)->maxid;
dbenv->tx_info->region->last_ckp = ckp_lsn;
dbenv->tx_info->region->time_ckp = (u_int32_t)now;
if ((ret = txn_checkpoint(dbenv->tx_info, 0, 0)) != 0)
goto err;
if (dbenv->db_verbose) {
__db_err(lp->dbenv, "Recovery complete at %s", ctime(&now));
__db_err(lp->dbenv, "%s %lu %s [%lu][%lu]",
"Maximum transaction id",
(u_long)dbenv->tx_info->region->last_txnid,
"Recovery checkpoint",
(u_long)dbenv->tx_info->region->last_ckp.file,
(u_long)dbenv->tx_info->region->last_ckp.offset);
}
F_SET(lp, is_thread);
return (0);
msgerr: __db_err(dbenv, "Recovery function for LSN %lu %lu failed",
(u_long)lsn.file, (u_long)lsn.offset);
err: F_SET(lp, is_thread);
return (ret);
}
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