aboutsummaryrefslogtreecommitdiff
path: root/db2/common/db_apprec.c
blob: b22b0c5e9ab47a789f43e314bdd95f03d2940ec6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
/*-
 * 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	10.15 (Sleepycat) 7/27/97";
#endif

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>

#include <time.h>
#include <string.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, ret, tret;
	void *txninfo;

	ZERO_LSN(ckp_lsn);

	/* Initialize the transaction list. */
	if ((ret = __db_txnlist_init(&txninfo)) != 0)
		return (ret);

	/*
	 * 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 figures this out for us when
	 * we pass it the DB_FIRST flag).
	 */
	lp = dbenv->lg_info;
	if (LF_ISSET(DB_RECOVER_FATAL))
		first_flag = DB_FIRST;
	else
		first_flag = __log_findckp(lp, &lsn) != 0 ? DB_FIRST : DB_SET;

	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 == 0;
	    ret = log_get(dbenv->lg_info, &lsn, &data, DB_NEXT))
		if ((tret = __db_dispatch(lp,
		    &data, &lsn, TXN_OPENFILES, txninfo)) < 0) {
			ret = tret;
			goto msgerr;
		}

	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;
		tret =
		    __db_dispatch(lp, &data, &lsn, TXN_BACKWARD_ROLL, txninfo);
		if (IS_ZERO_LSN(ckp_lsn) && tret > 0)
			ckp_lsn = tmp_lsn;
		if (tret < 0) {
			ret = tret;
			goto msgerr;
		}
	}

	for (ret = log_get(lp, &lsn, &data, DB_NEXT);
	    ret == 0; ret = log_get(lp, &lsn, &data, DB_NEXT))
		if ((tret = __db_dispatch(lp,
		    &data, &lsn, TXN_FORWARD_ROLL, txninfo)) < 0) {
			ret = tret;
			goto msgerr;
		}

	/* 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;
	txn_checkpoint(dbenv->tx_info, 0, 0);

	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);
	}

	return (0);

msgerr:	__db_err(dbenv, "Recovery function for LSN %lu %lu failed",
	    (u_long)lsn.file, (u_long)lsn.offset);

err:	return (ret);
}