xref: /onnv-gate/usr/src/cmd/sendmail/db/log/log.c (revision 0:68f95e015346)
1*0Sstevel@tonic-gate /*-
2*0Sstevel@tonic-gate  * See the file LICENSE for redistribution information.
3*0Sstevel@tonic-gate  *
4*0Sstevel@tonic-gate  * Copyright (c) 1996, 1997, 1998
5*0Sstevel@tonic-gate  *	Sleepycat Software.  All rights reserved.
6*0Sstevel@tonic-gate  */
7*0Sstevel@tonic-gate #include "config.h"
8*0Sstevel@tonic-gate 
9*0Sstevel@tonic-gate #ifndef lint
10*0Sstevel@tonic-gate static const char sccsid[] = "@(#)log.c	10.63 (Sleepycat) 10/10/98";
11*0Sstevel@tonic-gate #endif /* not lint */
12*0Sstevel@tonic-gate 
13*0Sstevel@tonic-gate #ifndef NO_SYSTEM_INCLUDES
14*0Sstevel@tonic-gate #include <sys/types.h>
15*0Sstevel@tonic-gate 
16*0Sstevel@tonic-gate #include <errno.h>
17*0Sstevel@tonic-gate #include <shqueue.h>
18*0Sstevel@tonic-gate #include <stdlib.h>
19*0Sstevel@tonic-gate #include <string.h>
20*0Sstevel@tonic-gate #include <unistd.h>
21*0Sstevel@tonic-gate #endif
22*0Sstevel@tonic-gate 
23*0Sstevel@tonic-gate #include "db_int.h"
24*0Sstevel@tonic-gate #include "shqueue.h"
25*0Sstevel@tonic-gate #include "log.h"
26*0Sstevel@tonic-gate #include "db_dispatch.h"
27*0Sstevel@tonic-gate #include "txn.h"
28*0Sstevel@tonic-gate #include "txn_auto.h"
29*0Sstevel@tonic-gate #include "common_ext.h"
30*0Sstevel@tonic-gate 
31*0Sstevel@tonic-gate static int __log_recover __P((DB_LOG *));
32*0Sstevel@tonic-gate 
33*0Sstevel@tonic-gate /*
34*0Sstevel@tonic-gate  * log_open --
35*0Sstevel@tonic-gate  *	Initialize and/or join a log.
36*0Sstevel@tonic-gate  */
37*0Sstevel@tonic-gate int
log_open(path,flags,mode,dbenv,lpp)38*0Sstevel@tonic-gate log_open(path, flags, mode, dbenv, lpp)
39*0Sstevel@tonic-gate 	const char *path;
40*0Sstevel@tonic-gate 	u_int32_t flags;
41*0Sstevel@tonic-gate 	int mode;
42*0Sstevel@tonic-gate 	DB_ENV *dbenv;
43*0Sstevel@tonic-gate 	DB_LOG **lpp;
44*0Sstevel@tonic-gate {
45*0Sstevel@tonic-gate 	DB_LOG *dblp;
46*0Sstevel@tonic-gate 	LOG *lp;
47*0Sstevel@tonic-gate 	int ret;
48*0Sstevel@tonic-gate 
49*0Sstevel@tonic-gate 	/* Validate arguments. */
50*0Sstevel@tonic-gate #ifdef HAVE_SPINLOCKS
51*0Sstevel@tonic-gate #define	OKFLAGS	(DB_CREATE | DB_THREAD)
52*0Sstevel@tonic-gate #else
53*0Sstevel@tonic-gate #define	OKFLAGS	(DB_CREATE)
54*0Sstevel@tonic-gate #endif
55*0Sstevel@tonic-gate 	if ((ret = __db_fchk(dbenv, "log_open", flags, OKFLAGS)) != 0)
56*0Sstevel@tonic-gate 		return (ret);
57*0Sstevel@tonic-gate 
58*0Sstevel@tonic-gate 	/* Create and initialize the DB_LOG structure. */
59*0Sstevel@tonic-gate 	if ((ret = __os_calloc(1, sizeof(DB_LOG), &dblp)) != 0)
60*0Sstevel@tonic-gate 		return (ret);
61*0Sstevel@tonic-gate 
62*0Sstevel@tonic-gate 	if (path != NULL && (ret = __os_strdup(path, &dblp->dir)) != 0)
63*0Sstevel@tonic-gate 		goto err;
64*0Sstevel@tonic-gate 
65*0Sstevel@tonic-gate 	dblp->dbenv = dbenv;
66*0Sstevel@tonic-gate 	dblp->lfd = -1;
67*0Sstevel@tonic-gate 	ZERO_LSN(dblp->c_lsn);
68*0Sstevel@tonic-gate 	dblp->c_fd = -1;
69*0Sstevel@tonic-gate 
70*0Sstevel@tonic-gate 	/*
71*0Sstevel@tonic-gate 	 * The log region isn't fixed size because we store the registered
72*0Sstevel@tonic-gate 	 * file names there.  Make it fairly large so that we don't have to
73*0Sstevel@tonic-gate 	 * grow it.
74*0Sstevel@tonic-gate 	 */
75*0Sstevel@tonic-gate #define	DEF_LOG_SIZE	(30 * 1024)
76*0Sstevel@tonic-gate 
77*0Sstevel@tonic-gate 	/* Map in the region. */
78*0Sstevel@tonic-gate 	dblp->reginfo.dbenv = dbenv;
79*0Sstevel@tonic-gate 	dblp->reginfo.appname = DB_APP_LOG;
80*0Sstevel@tonic-gate 	if (path == NULL)
81*0Sstevel@tonic-gate 		dblp->reginfo.path = NULL;
82*0Sstevel@tonic-gate 	else
83*0Sstevel@tonic-gate 		if ((ret = __os_strdup(path, &dblp->reginfo.path)) != 0)
84*0Sstevel@tonic-gate 			goto err;
85*0Sstevel@tonic-gate 	dblp->reginfo.file = DB_DEFAULT_LOG_FILE;
86*0Sstevel@tonic-gate 	dblp->reginfo.mode = mode;
87*0Sstevel@tonic-gate 	dblp->reginfo.size = DEF_LOG_SIZE;
88*0Sstevel@tonic-gate 	dblp->reginfo.dbflags = flags;
89*0Sstevel@tonic-gate 	dblp->reginfo.flags = REGION_SIZEDEF;
90*0Sstevel@tonic-gate 	if ((ret = __db_rattach(&dblp->reginfo)) != 0)
91*0Sstevel@tonic-gate 		goto err;
92*0Sstevel@tonic-gate 
93*0Sstevel@tonic-gate 	/*
94*0Sstevel@tonic-gate 	 * The LOG structure is first in the region, the rest of the region
95*0Sstevel@tonic-gate 	 * is free space.
96*0Sstevel@tonic-gate 	 */
97*0Sstevel@tonic-gate 	dblp->lp = dblp->reginfo.addr;
98*0Sstevel@tonic-gate 	dblp->addr = (u_int8_t *)dblp->lp + sizeof(LOG);
99*0Sstevel@tonic-gate 
100*0Sstevel@tonic-gate 	/* Initialize a created region. */
101*0Sstevel@tonic-gate 	if (F_ISSET(&dblp->reginfo, REGION_CREATED)) {
102*0Sstevel@tonic-gate 		__db_shalloc_init(dblp->addr, DEF_LOG_SIZE - sizeof(LOG));
103*0Sstevel@tonic-gate 
104*0Sstevel@tonic-gate 		/* Initialize the LOG structure. */
105*0Sstevel@tonic-gate 		lp = dblp->lp;
106*0Sstevel@tonic-gate 		lp->persist.lg_max = dbenv == NULL ? 0 : dbenv->lg_max;
107*0Sstevel@tonic-gate 		if (lp->persist.lg_max == 0)
108*0Sstevel@tonic-gate 			lp->persist.lg_max = DEFAULT_MAX;
109*0Sstevel@tonic-gate 		lp->persist.magic = DB_LOGMAGIC;
110*0Sstevel@tonic-gate 		lp->persist.version = DB_LOGVERSION;
111*0Sstevel@tonic-gate 		lp->persist.mode = mode;
112*0Sstevel@tonic-gate 		SH_TAILQ_INIT(&lp->fq);
113*0Sstevel@tonic-gate 
114*0Sstevel@tonic-gate 		/* Initialize LOG LSNs. */
115*0Sstevel@tonic-gate 		lp->lsn.file = 1;
116*0Sstevel@tonic-gate 		lp->lsn.offset = 0;
117*0Sstevel@tonic-gate 	}
118*0Sstevel@tonic-gate 
119*0Sstevel@tonic-gate 	/* Initialize thread information, mutex. */
120*0Sstevel@tonic-gate 	if (LF_ISSET(DB_THREAD)) {
121*0Sstevel@tonic-gate 		F_SET(dblp, DB_AM_THREAD);
122*0Sstevel@tonic-gate 		if ((ret = __db_shalloc(dblp->addr,
123*0Sstevel@tonic-gate 		    sizeof(db_mutex_t), MUTEX_ALIGNMENT, &dblp->mutexp)) != 0)
124*0Sstevel@tonic-gate 			goto err;
125*0Sstevel@tonic-gate 		(void)__db_mutex_init(dblp->mutexp, 0);
126*0Sstevel@tonic-gate 	}
127*0Sstevel@tonic-gate 
128*0Sstevel@tonic-gate 	/*
129*0Sstevel@tonic-gate 	 * If doing recovery, try and recover any previous log files before
130*0Sstevel@tonic-gate 	 * releasing the lock.
131*0Sstevel@tonic-gate 	 */
132*0Sstevel@tonic-gate 	if (F_ISSET(&dblp->reginfo, REGION_CREATED) &&
133*0Sstevel@tonic-gate 	    (ret = __log_recover(dblp)) != 0)
134*0Sstevel@tonic-gate 		goto err;
135*0Sstevel@tonic-gate 
136*0Sstevel@tonic-gate 	UNLOCK_LOGREGION(dblp);
137*0Sstevel@tonic-gate 	*lpp = dblp;
138*0Sstevel@tonic-gate 	return (0);
139*0Sstevel@tonic-gate 
140*0Sstevel@tonic-gate err:	if (dblp->reginfo.addr != NULL) {
141*0Sstevel@tonic-gate 		if (dblp->mutexp != NULL)
142*0Sstevel@tonic-gate 			__db_shalloc_free(dblp->addr, dblp->mutexp);
143*0Sstevel@tonic-gate 
144*0Sstevel@tonic-gate 		UNLOCK_LOGREGION(dblp);
145*0Sstevel@tonic-gate 		(void)__db_rdetach(&dblp->reginfo);
146*0Sstevel@tonic-gate 		if (F_ISSET(&dblp->reginfo, REGION_CREATED))
147*0Sstevel@tonic-gate 			(void)log_unlink(path, 1, dbenv);
148*0Sstevel@tonic-gate 	}
149*0Sstevel@tonic-gate 
150*0Sstevel@tonic-gate 	if (dblp->reginfo.path != NULL)
151*0Sstevel@tonic-gate 		__os_freestr(dblp->reginfo.path);
152*0Sstevel@tonic-gate 	if (dblp->dir != NULL)
153*0Sstevel@tonic-gate 		__os_freestr(dblp->dir);
154*0Sstevel@tonic-gate 	__os_free(dblp, sizeof(*dblp));
155*0Sstevel@tonic-gate 	return (ret);
156*0Sstevel@tonic-gate }
157*0Sstevel@tonic-gate 
158*0Sstevel@tonic-gate /*
159*0Sstevel@tonic-gate  * __log_panic --
160*0Sstevel@tonic-gate  *	Panic a log.
161*0Sstevel@tonic-gate  *
162*0Sstevel@tonic-gate  * PUBLIC: void __log_panic __P((DB_ENV *));
163*0Sstevel@tonic-gate  */
164*0Sstevel@tonic-gate void
__log_panic(dbenv)165*0Sstevel@tonic-gate __log_panic(dbenv)
166*0Sstevel@tonic-gate 	DB_ENV *dbenv;
167*0Sstevel@tonic-gate {
168*0Sstevel@tonic-gate 	if (dbenv->lg_info != NULL)
169*0Sstevel@tonic-gate 		dbenv->lg_info->lp->rlayout.panic = 1;
170*0Sstevel@tonic-gate }
171*0Sstevel@tonic-gate 
172*0Sstevel@tonic-gate /*
173*0Sstevel@tonic-gate  * __log_recover --
174*0Sstevel@tonic-gate  *	Recover a log.
175*0Sstevel@tonic-gate  */
176*0Sstevel@tonic-gate static int
__log_recover(dblp)177*0Sstevel@tonic-gate __log_recover(dblp)
178*0Sstevel@tonic-gate 	DB_LOG *dblp;
179*0Sstevel@tonic-gate {
180*0Sstevel@tonic-gate 	DBT dbt;
181*0Sstevel@tonic-gate 	DB_LSN lsn;
182*0Sstevel@tonic-gate 	LOG *lp;
183*0Sstevel@tonic-gate 	u_int32_t chk;
184*0Sstevel@tonic-gate 	int cnt, found_checkpoint, ret;
185*0Sstevel@tonic-gate 
186*0Sstevel@tonic-gate 	lp = dblp->lp;
187*0Sstevel@tonic-gate 
188*0Sstevel@tonic-gate 	/*
189*0Sstevel@tonic-gate 	 * Find a log file.  If none exist, we simply return, leaving
190*0Sstevel@tonic-gate 	 * everything initialized to a new log.
191*0Sstevel@tonic-gate 	 */
192*0Sstevel@tonic-gate 	if ((ret = __log_find(dblp, 0, &cnt)) != 0)
193*0Sstevel@tonic-gate 		return (ret);
194*0Sstevel@tonic-gate 	if (cnt == 0)
195*0Sstevel@tonic-gate 		return (0);
196*0Sstevel@tonic-gate 
197*0Sstevel@tonic-gate 	/*
198*0Sstevel@tonic-gate 	 * We have the last useful log file and we've loaded any persistent
199*0Sstevel@tonic-gate 	 * information.  Pretend that the log is larger than it can possibly
200*0Sstevel@tonic-gate 	 * be, and read the last file, looking for the last checkpoint and
201*0Sstevel@tonic-gate 	 * the log's end.
202*0Sstevel@tonic-gate 	 */
203*0Sstevel@tonic-gate 	lp->lsn.file = cnt + 1;
204*0Sstevel@tonic-gate 	lp->lsn.offset = 0;
205*0Sstevel@tonic-gate 	lsn.file = cnt;
206*0Sstevel@tonic-gate 	lsn.offset = 0;
207*0Sstevel@tonic-gate 
208*0Sstevel@tonic-gate 	/* Set the cursor.  Shouldn't fail, leave error messages on. */
209*0Sstevel@tonic-gate 	memset(&dbt, 0, sizeof(dbt));
210*0Sstevel@tonic-gate 	if ((ret = __log_get(dblp, &lsn, &dbt, DB_SET, 0)) != 0)
211*0Sstevel@tonic-gate 		return (ret);
212*0Sstevel@tonic-gate 
213*0Sstevel@tonic-gate 	/*
214*0Sstevel@tonic-gate 	 * Read to the end of the file, saving checkpoints.  This will fail
215*0Sstevel@tonic-gate 	 * at some point, so turn off error messages.
216*0Sstevel@tonic-gate 	 */
217*0Sstevel@tonic-gate 	found_checkpoint = 0;
218*0Sstevel@tonic-gate 	while (__log_get(dblp, &lsn, &dbt, DB_NEXT, 1) == 0) {
219*0Sstevel@tonic-gate 		if (dbt.size < sizeof(u_int32_t))
220*0Sstevel@tonic-gate 			continue;
221*0Sstevel@tonic-gate 		memcpy(&chk, dbt.data, sizeof(u_int32_t));
222*0Sstevel@tonic-gate 		if (chk == DB_txn_ckp) {
223*0Sstevel@tonic-gate 			lp->chkpt_lsn = lsn;
224*0Sstevel@tonic-gate 			found_checkpoint = 1;
225*0Sstevel@tonic-gate 		}
226*0Sstevel@tonic-gate 	}
227*0Sstevel@tonic-gate 
228*0Sstevel@tonic-gate 	/*
229*0Sstevel@tonic-gate 	 * We now know where the end of the log is.  Set the first LSN that
230*0Sstevel@tonic-gate 	 * we want to return to an application and the LSN of the last known
231*0Sstevel@tonic-gate 	 * record on disk.
232*0Sstevel@tonic-gate 	 */
233*0Sstevel@tonic-gate 	lp->lsn = lp->s_lsn = lsn;
234*0Sstevel@tonic-gate 	lp->lsn.offset += dblp->c_len;
235*0Sstevel@tonic-gate 
236*0Sstevel@tonic-gate 	/* Set up the current buffer information, too. */
237*0Sstevel@tonic-gate 	lp->len = dblp->c_len;
238*0Sstevel@tonic-gate 	lp->b_off = 0;
239*0Sstevel@tonic-gate 	lp->w_off = lp->lsn.offset;
240*0Sstevel@tonic-gate 
241*0Sstevel@tonic-gate 	/*
242*0Sstevel@tonic-gate 	 * It's possible that we didn't find a checkpoint because there wasn't
243*0Sstevel@tonic-gate 	 * one in the last log file.  Start searching.
244*0Sstevel@tonic-gate 	 */
245*0Sstevel@tonic-gate 	while (!found_checkpoint && cnt > 1) {
246*0Sstevel@tonic-gate 		lsn.file = --cnt;
247*0Sstevel@tonic-gate 		lsn.offset = 0;
248*0Sstevel@tonic-gate 
249*0Sstevel@tonic-gate 		/* Set the cursor.  Shouldn't fail, leave error messages on. */
250*0Sstevel@tonic-gate 		if ((ret = __log_get(dblp, &lsn, &dbt, DB_SET, 0)) != 0)
251*0Sstevel@tonic-gate 			return (ret);
252*0Sstevel@tonic-gate 
253*0Sstevel@tonic-gate 		/*
254*0Sstevel@tonic-gate 		 * Read to the end of the file, saving checkpoints.  Shouldn't
255*0Sstevel@tonic-gate 		 * fail, leave error messages on.
256*0Sstevel@tonic-gate 		 */
257*0Sstevel@tonic-gate 		while (__log_get(dblp, &lsn, &dbt, DB_NEXT, 0) == 0) {
258*0Sstevel@tonic-gate 			if (dbt.size < sizeof(u_int32_t))
259*0Sstevel@tonic-gate 				continue;
260*0Sstevel@tonic-gate 			memcpy(&chk, dbt.data, sizeof(u_int32_t));
261*0Sstevel@tonic-gate 			if (chk == DB_txn_ckp) {
262*0Sstevel@tonic-gate 				lp->chkpt_lsn = lsn;
263*0Sstevel@tonic-gate 				found_checkpoint = 1;
264*0Sstevel@tonic-gate 			}
265*0Sstevel@tonic-gate 		}
266*0Sstevel@tonic-gate 	}
267*0Sstevel@tonic-gate 	/*
268*0Sstevel@tonic-gate 	 * Reset the cursor lsn to the beginning of the log, so that an
269*0Sstevel@tonic-gate 	 * initial call to DB_NEXT does the right thing.
270*0Sstevel@tonic-gate 	 */
271*0Sstevel@tonic-gate 	ZERO_LSN(dblp->c_lsn);
272*0Sstevel@tonic-gate 
273*0Sstevel@tonic-gate 	/* If we never find a checkpoint, that's okay, just 0 it out. */
274*0Sstevel@tonic-gate 	if (!found_checkpoint)
275*0Sstevel@tonic-gate 		ZERO_LSN(lp->chkpt_lsn);
276*0Sstevel@tonic-gate 
277*0Sstevel@tonic-gate 	/*
278*0Sstevel@tonic-gate 	 * !!!
279*0Sstevel@tonic-gate 	 * The test suite explicitly looks for this string -- don't change
280*0Sstevel@tonic-gate 	 * it here unless you also change it there.
281*0Sstevel@tonic-gate 	 */
282*0Sstevel@tonic-gate 	__db_err(dblp->dbenv,
283*0Sstevel@tonic-gate 	    "Finding last valid log LSN: file: %lu offset %lu",
284*0Sstevel@tonic-gate 	    (u_long)lp->lsn.file, (u_long)lp->lsn.offset);
285*0Sstevel@tonic-gate 
286*0Sstevel@tonic-gate 	return (0);
287*0Sstevel@tonic-gate }
288*0Sstevel@tonic-gate 
289*0Sstevel@tonic-gate /*
290*0Sstevel@tonic-gate  * __log_find --
291*0Sstevel@tonic-gate  *	Try to find a log file.  If find_first is set, valp will contain
292*0Sstevel@tonic-gate  * the number of the first log file, else it will contain the number of
293*0Sstevel@tonic-gate  * the last log file.
294*0Sstevel@tonic-gate  *
295*0Sstevel@tonic-gate  * PUBLIC: int __log_find __P((DB_LOG *, int, int *));
296*0Sstevel@tonic-gate  */
297*0Sstevel@tonic-gate int
__log_find(dblp,find_first,valp)298*0Sstevel@tonic-gate __log_find(dblp, find_first, valp)
299*0Sstevel@tonic-gate 	DB_LOG *dblp;
300*0Sstevel@tonic-gate 	int find_first, *valp;
301*0Sstevel@tonic-gate {
302*0Sstevel@tonic-gate 	u_int32_t clv, logval;
303*0Sstevel@tonic-gate 	int cnt, fcnt, ret;
304*0Sstevel@tonic-gate 	const char *dir;
305*0Sstevel@tonic-gate 	char **names, *p, *q;
306*0Sstevel@tonic-gate 
307*0Sstevel@tonic-gate 	*valp = 0;
308*0Sstevel@tonic-gate 
309*0Sstevel@tonic-gate 	/* Find the directory name. */
310*0Sstevel@tonic-gate 	if ((ret = __log_name(dblp, 1, &p, NULL, 0)) != 0)
311*0Sstevel@tonic-gate 		return (ret);
312*0Sstevel@tonic-gate 	if ((q = __db_rpath(p)) == NULL)
313*0Sstevel@tonic-gate 		dir = PATH_DOT;
314*0Sstevel@tonic-gate 	else {
315*0Sstevel@tonic-gate 		*q = '\0';
316*0Sstevel@tonic-gate 		dir = p;
317*0Sstevel@tonic-gate 	}
318*0Sstevel@tonic-gate 
319*0Sstevel@tonic-gate 	/* Get the list of file names. */
320*0Sstevel@tonic-gate 	ret = __os_dirlist(dir, &names, &fcnt);
321*0Sstevel@tonic-gate 	__os_freestr(p);
322*0Sstevel@tonic-gate 	if (ret != 0) {
323*0Sstevel@tonic-gate 		__db_err(dblp->dbenv, "%s: %s", dir, strerror(ret));
324*0Sstevel@tonic-gate 		return (ret);
325*0Sstevel@tonic-gate 	}
326*0Sstevel@tonic-gate 
327*0Sstevel@tonic-gate 	/*
328*0Sstevel@tonic-gate 	 * Search for a valid log file name, return a value of 0 on
329*0Sstevel@tonic-gate 	 * failure.
330*0Sstevel@tonic-gate 	 *
331*0Sstevel@tonic-gate 	 * XXX
332*0Sstevel@tonic-gate 	 * Assumes that atoi(3) returns a 32-bit number.
333*0Sstevel@tonic-gate 	 */
334*0Sstevel@tonic-gate 	for (cnt = fcnt, clv = logval = 0; --cnt >= 0;) {
335*0Sstevel@tonic-gate 		if (strncmp(names[cnt], LFPREFIX, sizeof(LFPREFIX) - 1) != 0)
336*0Sstevel@tonic-gate 			continue;
337*0Sstevel@tonic-gate 
338*0Sstevel@tonic-gate 		clv = atoi(names[cnt] + (sizeof(LFPREFIX) - 1));
339*0Sstevel@tonic-gate 		if (find_first) {
340*0Sstevel@tonic-gate 			if (logval != 0 && clv > logval)
341*0Sstevel@tonic-gate 				continue;
342*0Sstevel@tonic-gate 		} else
343*0Sstevel@tonic-gate 			if (logval != 0 && clv < logval)
344*0Sstevel@tonic-gate 				continue;
345*0Sstevel@tonic-gate 
346*0Sstevel@tonic-gate 		if (__log_valid(dblp, clv, 1) == 0)
347*0Sstevel@tonic-gate 			logval = clv;
348*0Sstevel@tonic-gate 	}
349*0Sstevel@tonic-gate 
350*0Sstevel@tonic-gate 	*valp = logval;
351*0Sstevel@tonic-gate 
352*0Sstevel@tonic-gate 	/* Discard the list. */
353*0Sstevel@tonic-gate 	__os_dirfree(names, fcnt);
354*0Sstevel@tonic-gate 
355*0Sstevel@tonic-gate 	return (0);
356*0Sstevel@tonic-gate }
357*0Sstevel@tonic-gate 
358*0Sstevel@tonic-gate /*
359*0Sstevel@tonic-gate  * log_valid --
360*0Sstevel@tonic-gate  *	Validate a log file.
361*0Sstevel@tonic-gate  *
362*0Sstevel@tonic-gate  * PUBLIC: int __log_valid __P((DB_LOG *, u_int32_t, int));
363*0Sstevel@tonic-gate  */
364*0Sstevel@tonic-gate int
__log_valid(dblp,number,set_persist)365*0Sstevel@tonic-gate __log_valid(dblp, number, set_persist)
366*0Sstevel@tonic-gate 	DB_LOG *dblp;
367*0Sstevel@tonic-gate 	u_int32_t number;
368*0Sstevel@tonic-gate 	int set_persist;
369*0Sstevel@tonic-gate {
370*0Sstevel@tonic-gate 	LOGP persist;
371*0Sstevel@tonic-gate 	ssize_t nw;
372*0Sstevel@tonic-gate 	char *fname;
373*0Sstevel@tonic-gate 	int fd, ret;
374*0Sstevel@tonic-gate 
375*0Sstevel@tonic-gate 	/* Try to open the log file. */
376*0Sstevel@tonic-gate 	if ((ret = __log_name(dblp,
377*0Sstevel@tonic-gate 	    number, &fname, &fd, DB_RDONLY | DB_SEQUENTIAL)) != 0) {
378*0Sstevel@tonic-gate 		__os_freestr(fname);
379*0Sstevel@tonic-gate 		return (ret);
380*0Sstevel@tonic-gate 	}
381*0Sstevel@tonic-gate 
382*0Sstevel@tonic-gate 	/* Try to read the header. */
383*0Sstevel@tonic-gate 	if ((ret = __os_seek(fd, 0, 0, sizeof(HDR), 0, SEEK_SET)) != 0 ||
384*0Sstevel@tonic-gate 	    (ret = __os_read(fd, &persist, sizeof(LOGP), &nw)) != 0 ||
385*0Sstevel@tonic-gate 	    nw != sizeof(LOGP)) {
386*0Sstevel@tonic-gate 		if (ret == 0)
387*0Sstevel@tonic-gate 			ret = EIO;
388*0Sstevel@tonic-gate 
389*0Sstevel@tonic-gate 		(void)__os_close(fd);
390*0Sstevel@tonic-gate 
391*0Sstevel@tonic-gate 		__db_err(dblp->dbenv,
392*0Sstevel@tonic-gate 		    "Ignoring log file: %s: %s", fname, strerror(ret));
393*0Sstevel@tonic-gate 		goto err;
394*0Sstevel@tonic-gate 	}
395*0Sstevel@tonic-gate 	(void)__os_close(fd);
396*0Sstevel@tonic-gate 
397*0Sstevel@tonic-gate 	/* Validate the header. */
398*0Sstevel@tonic-gate 	if (persist.magic != DB_LOGMAGIC) {
399*0Sstevel@tonic-gate 		__db_err(dblp->dbenv,
400*0Sstevel@tonic-gate 		    "Ignoring log file: %s: magic number %lx, not %lx",
401*0Sstevel@tonic-gate 		    fname, (u_long)persist.magic, (u_long)DB_LOGMAGIC);
402*0Sstevel@tonic-gate 		ret = EINVAL;
403*0Sstevel@tonic-gate 		goto err;
404*0Sstevel@tonic-gate 	}
405*0Sstevel@tonic-gate 	if (persist.version < DB_LOGOLDVER || persist.version > DB_LOGVERSION) {
406*0Sstevel@tonic-gate 		__db_err(dblp->dbenv,
407*0Sstevel@tonic-gate 		    "Ignoring log file: %s: unsupported log version %lu",
408*0Sstevel@tonic-gate 		    fname, (u_long)persist.version);
409*0Sstevel@tonic-gate 		ret = EINVAL;
410*0Sstevel@tonic-gate 		goto err;
411*0Sstevel@tonic-gate 	}
412*0Sstevel@tonic-gate 
413*0Sstevel@tonic-gate 	/*
414*0Sstevel@tonic-gate 	 * If we're going to use this log file, set the region's persistent
415*0Sstevel@tonic-gate 	 * information based on the headers.
416*0Sstevel@tonic-gate 	 */
417*0Sstevel@tonic-gate 	if (set_persist) {
418*0Sstevel@tonic-gate 		dblp->lp->persist.lg_max = persist.lg_max;
419*0Sstevel@tonic-gate 		dblp->lp->persist.mode = persist.mode;
420*0Sstevel@tonic-gate 	}
421*0Sstevel@tonic-gate 	ret = 0;
422*0Sstevel@tonic-gate 
423*0Sstevel@tonic-gate err:	__os_freestr(fname);
424*0Sstevel@tonic-gate 	return (ret);
425*0Sstevel@tonic-gate }
426*0Sstevel@tonic-gate 
427*0Sstevel@tonic-gate /*
428*0Sstevel@tonic-gate  * log_close --
429*0Sstevel@tonic-gate  *	Close a log.
430*0Sstevel@tonic-gate  */
431*0Sstevel@tonic-gate int
log_close(dblp)432*0Sstevel@tonic-gate log_close(dblp)
433*0Sstevel@tonic-gate 	DB_LOG *dblp;
434*0Sstevel@tonic-gate {
435*0Sstevel@tonic-gate 	u_int32_t i;
436*0Sstevel@tonic-gate 	int ret, t_ret;
437*0Sstevel@tonic-gate 
438*0Sstevel@tonic-gate 	LOG_PANIC_CHECK(dblp);
439*0Sstevel@tonic-gate 
440*0Sstevel@tonic-gate 	/* We may have opened files as part of XA; if so, close them. */
441*0Sstevel@tonic-gate 	__log_close_files(dblp);
442*0Sstevel@tonic-gate 
443*0Sstevel@tonic-gate 	/* Discard the per-thread pointer. */
444*0Sstevel@tonic-gate 	if (dblp->mutexp != NULL) {
445*0Sstevel@tonic-gate 		LOCK_LOGREGION(dblp);
446*0Sstevel@tonic-gate 		__db_shalloc_free(dblp->addr, dblp->mutexp);
447*0Sstevel@tonic-gate 		UNLOCK_LOGREGION(dblp);
448*0Sstevel@tonic-gate 	}
449*0Sstevel@tonic-gate 
450*0Sstevel@tonic-gate 	/* Close the region. */
451*0Sstevel@tonic-gate 	ret = __db_rdetach(&dblp->reginfo);
452*0Sstevel@tonic-gate 
453*0Sstevel@tonic-gate 	/* Close open files, release allocated memory. */
454*0Sstevel@tonic-gate 	if (dblp->lfd != -1 && (t_ret = __os_close(dblp->lfd)) != 0 && ret == 0)
455*0Sstevel@tonic-gate 		ret = t_ret;
456*0Sstevel@tonic-gate 	if (dblp->c_dbt.data != NULL)
457*0Sstevel@tonic-gate 		__os_free(dblp->c_dbt.data, dblp->c_dbt.ulen);
458*0Sstevel@tonic-gate 	if (dblp->c_fd != -1 &&
459*0Sstevel@tonic-gate 	    (t_ret = __os_close(dblp->c_fd)) != 0 && ret == 0)
460*0Sstevel@tonic-gate 		ret = t_ret;
461*0Sstevel@tonic-gate 	if (dblp->dbentry != NULL) {
462*0Sstevel@tonic-gate 		for (i = 0; i < dblp->dbentry_cnt; i++)
463*0Sstevel@tonic-gate 			if (dblp->dbentry[i].name != NULL)
464*0Sstevel@tonic-gate 				__os_freestr(dblp->dbentry[i].name);
465*0Sstevel@tonic-gate 		__os_free(dblp->dbentry,
466*0Sstevel@tonic-gate 		    (dblp->dbentry_cnt * sizeof(DB_ENTRY)));
467*0Sstevel@tonic-gate 	}
468*0Sstevel@tonic-gate 
469*0Sstevel@tonic-gate 	if (dblp->dir != NULL)
470*0Sstevel@tonic-gate 		__os_freestr(dblp->dir);
471*0Sstevel@tonic-gate 
472*0Sstevel@tonic-gate 	if (dblp->reginfo.path != NULL)
473*0Sstevel@tonic-gate 		__os_freestr(dblp->reginfo.path);
474*0Sstevel@tonic-gate 	__os_free(dblp, sizeof(*dblp));
475*0Sstevel@tonic-gate 
476*0Sstevel@tonic-gate 	return (ret);
477*0Sstevel@tonic-gate }
478*0Sstevel@tonic-gate 
479*0Sstevel@tonic-gate /*
480*0Sstevel@tonic-gate  * log_unlink --
481*0Sstevel@tonic-gate  *	Exit a log.
482*0Sstevel@tonic-gate  */
483*0Sstevel@tonic-gate int
log_unlink(path,force,dbenv)484*0Sstevel@tonic-gate log_unlink(path, force, dbenv)
485*0Sstevel@tonic-gate 	const char *path;
486*0Sstevel@tonic-gate 	int force;
487*0Sstevel@tonic-gate 	DB_ENV *dbenv;
488*0Sstevel@tonic-gate {
489*0Sstevel@tonic-gate 	REGINFO reginfo;
490*0Sstevel@tonic-gate 	int ret;
491*0Sstevel@tonic-gate 
492*0Sstevel@tonic-gate 	memset(&reginfo, 0, sizeof(reginfo));
493*0Sstevel@tonic-gate 	reginfo.dbenv = dbenv;
494*0Sstevel@tonic-gate 	reginfo.appname = DB_APP_LOG;
495*0Sstevel@tonic-gate 	if (path != NULL && (ret = __os_strdup(path, &reginfo.path)) != 0)
496*0Sstevel@tonic-gate 		return (ret);
497*0Sstevel@tonic-gate 	reginfo.file = DB_DEFAULT_LOG_FILE;
498*0Sstevel@tonic-gate 	ret = __db_runlink(&reginfo, force);
499*0Sstevel@tonic-gate 	if (reginfo.path != NULL)
500*0Sstevel@tonic-gate 		__os_freestr(reginfo.path);
501*0Sstevel@tonic-gate 	return (ret);
502*0Sstevel@tonic-gate }
503*0Sstevel@tonic-gate 
504*0Sstevel@tonic-gate /*
505*0Sstevel@tonic-gate  * log_stat --
506*0Sstevel@tonic-gate  *	Return LOG statistics.
507*0Sstevel@tonic-gate  */
508*0Sstevel@tonic-gate int
log_stat(dblp,gspp,db_malloc)509*0Sstevel@tonic-gate log_stat(dblp, gspp, db_malloc)
510*0Sstevel@tonic-gate 	DB_LOG *dblp;
511*0Sstevel@tonic-gate 	DB_LOG_STAT **gspp;
512*0Sstevel@tonic-gate 	void *(*db_malloc) __P((size_t));
513*0Sstevel@tonic-gate {
514*0Sstevel@tonic-gate 	LOG *lp;
515*0Sstevel@tonic-gate 	int ret;
516*0Sstevel@tonic-gate 
517*0Sstevel@tonic-gate 	*gspp = NULL;
518*0Sstevel@tonic-gate 	lp = dblp->lp;
519*0Sstevel@tonic-gate 
520*0Sstevel@tonic-gate 	LOG_PANIC_CHECK(dblp);
521*0Sstevel@tonic-gate 
522*0Sstevel@tonic-gate 	if ((ret = __os_malloc(sizeof(**gspp), db_malloc, gspp)) != 0)
523*0Sstevel@tonic-gate 		return (ret);
524*0Sstevel@tonic-gate 
525*0Sstevel@tonic-gate 	/* Copy out the global statistics. */
526*0Sstevel@tonic-gate 	LOCK_LOGREGION(dblp);
527*0Sstevel@tonic-gate 	**gspp = lp->stat;
528*0Sstevel@tonic-gate 
529*0Sstevel@tonic-gate 	(*gspp)->st_magic = lp->persist.magic;
530*0Sstevel@tonic-gate 	(*gspp)->st_version = lp->persist.version;
531*0Sstevel@tonic-gate 	(*gspp)->st_mode = lp->persist.mode;
532*0Sstevel@tonic-gate 	(*gspp)->st_lg_max = lp->persist.lg_max;
533*0Sstevel@tonic-gate 
534*0Sstevel@tonic-gate 	(*gspp)->st_region_nowait = lp->rlayout.lock.mutex_set_nowait;
535*0Sstevel@tonic-gate 	(*gspp)->st_region_wait = lp->rlayout.lock.mutex_set_wait;
536*0Sstevel@tonic-gate 
537*0Sstevel@tonic-gate 	(*gspp)->st_cur_file = lp->lsn.file;
538*0Sstevel@tonic-gate 	(*gspp)->st_cur_offset = lp->lsn.offset;
539*0Sstevel@tonic-gate 
540*0Sstevel@tonic-gate 	(*gspp)->st_refcnt = lp->rlayout.refcnt;
541*0Sstevel@tonic-gate 	(*gspp)->st_regsize = lp->rlayout.size;
542*0Sstevel@tonic-gate 
543*0Sstevel@tonic-gate 	UNLOCK_LOGREGION(dblp);
544*0Sstevel@tonic-gate 
545*0Sstevel@tonic-gate 	return (0);
546*0Sstevel@tonic-gate }
547