aboutsummaryrefslogtreecommitdiff
path: root/db2/btree/bt_rec.c
blob: d4bc7f6824849d91d782dba611ac6d0302239fd0 (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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996, 1997
 *	Sleepycat Software.  All rights reserved.
 */

#include "config.h"

#ifndef lint
static const char sccsid[] = "@(#)bt_rec.c	10.11 (Sleepycat) 8/22/97";
#endif /* not lint */

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

#include <ctype.h>
#include <errno.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#endif

#include "db_int.h"
#include "db_page.h"
#include "shqueue.h"
#include "hash.h"
#include "btree.h"
#include "log.h"
#include "db_dispatch.h"
#include "common_ext.h"

/*
 * __bam_pg_alloc_recover --
 *	Recovery function for pg_alloc.
 *
 * PUBLIC: int __bam_pg_alloc_recover
 * PUBLIC:   __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
 */
int
__bam_pg_alloc_recover(logp, dbtp, lsnp, redo, info)
	DB_LOG *logp;
	DBT *dbtp;
	DB_LSN *lsnp;
	int redo;
	void *info;
{
	__bam_pg_alloc_args *argp;
	BTMETA *meta;
	DB_MPOOLFILE *mpf;
	PAGE *pagep;
	DB *file_dbp, *mdbp;
	db_pgno_t pgno;
	int cmp_n, cmp_p, created, modified, ret;

	REC_PRINT(__bam_pg_alloc_print);
	REC_INTRO(__bam_pg_alloc_read);

	/*
	 * Fix up the allocated page.  If we're redoing the operation, we have
	 * to get the page (creating it if it doesn't exist), and update its
	 * LSN.  If we're undoing the operation, we have to reset the page's
	 * LSN and put it on the free list.  
	 *
	 * Fix up the metadata page.  If we're redoing the operation, we have
	 * to get the metadata page and update its LSN and its free pointer.
	 * If we're undoing the operation and the page was ever created, we put
	 * it on the freelist.
	 */
	pgno = PGNO_METADATA;
	if ((ret = memp_fget(mpf, &pgno, 0, &meta)) != 0) {
		(void)__db_pgerr(file_dbp, pgno);
		goto out;
	}
	if ((ret = memp_fget(mpf, &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0) {
		(void)__db_pgerr(file_dbp, argp->pgno);
		(void)memp_fput(mpf, meta, 0);
		goto out;
	}

	/* Fix up the allocated page. */
	created = IS_ZERO_LSN(LSN(pagep));
	modified = 0;
	cmp_n = log_compare(lsnp, &LSN(pagep));
	cmp_p = log_compare(&LSN(pagep), &argp->page_lsn);
	if ((created || cmp_p == 0) && redo) {
		/* Need to redo update described. */
		P_INIT(pagep, file_dbp->pgsize,
		    argp->pgno, PGNO_INVALID, PGNO_INVALID, 0, argp->ptype);

		pagep->lsn = *lsnp;
		modified = 1;
	} else if ((created || cmp_n == 0) && !redo) {
		/* Need to undo update described. */
		P_INIT(pagep, file_dbp->pgsize,
		    argp->pgno, PGNO_INVALID, meta->free, 0, P_INVALID);

		pagep->lsn = argp->page_lsn;
		modified = 1;
	}
	if ((ret = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0) {
		(void)__db_panic(file_dbp);
		(void)memp_fput(mpf, meta, 0);
		goto out;
	}

	/* Fix up the metadata page. */
	modified = 0;
	cmp_n = log_compare(lsnp, &LSN(meta));
	cmp_p = log_compare(&LSN(meta), &argp->meta_lsn);
	if (cmp_p == 0 && redo) {
		/* Need to redo update described. */
		meta->lsn = *lsnp;
		meta->free = argp->next;
		modified = 1;
	} else if (cmp_n == 0 && !redo) {
		/* Need to undo update described. */
		meta->lsn = argp->meta_lsn;
		meta->free = argp->pgno;
		modified = 1;
	}
	if ((ret = memp_fput(mpf, meta, modified ? DB_MPOOL_DIRTY : 0)) != 0) {
		(void)__db_panic(file_dbp);
		goto out;
	}

	*lsnp = argp->prev_lsn;
	ret = 0;

out:	REC_CLOSE;
}

/*
 * __bam_pg_free_recover --
 *	Recovery function for pg_free.
 *
 * PUBLIC: int __bam_pg_free_recover
 * PUBLIC:   __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
 */
int
__bam_pg_free_recover(logp, dbtp, lsnp, redo, info)
	DB_LOG *logp;
	DBT *dbtp;
	DB_LSN *lsnp;
	int redo;
	void *info;
{
	__bam_pg_free_args *argp;
	BTMETA *meta;
	DB *file_dbp, *mdbp;
	DB_MPOOLFILE *mpf;
	PAGE *pagep;
	db_pgno_t pgno;
	int cmp_n, cmp_p, modified, ret;

	REC_PRINT(__bam_pg_free_print);
	REC_INTRO(__bam_pg_free_read);

	/*
	 * Fix up the freed page.  If we're redoing the operation we get the
	 * page and explicitly discard its contents, then update its LSN.  If
	 * we're undoing the operation, we get the page and restore its header.
	 */
	if ((ret = memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
		(void)__db_pgerr(file_dbp, argp->pgno);
		goto out;
	}
	modified = 0;
	cmp_n = log_compare(lsnp, &LSN(pagep));
	cmp_p = log_compare(&LSN(pagep), &LSN(argp->header.data));
	if (cmp_p == 0 && redo) {
		/* Need to redo update described. */
		P_INIT(pagep, file_dbp->pgsize,
		    pagep->pgno, PGNO_INVALID, argp->next, 0, P_INVALID);
		pagep->lsn = *lsnp;

		modified = 1;
	} else if (cmp_n == 0 && !redo) {
		/* Need to undo update described. */
		memcpy(pagep, argp->header.data, argp->header.size);

		modified = 1;
	}
	if ((ret = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0) {
		(void)__db_panic(file_dbp);
		goto out;
	}

	/*
	 * Fix up the metadata page.  If we're redoing or undoing the operation
	 * we get the page and update its LSN and free pointer.
	 */
	pgno = PGNO_METADATA;
	if ((ret = memp_fget(mpf, &pgno, 0, &meta)) != 0) {
		(void)__db_pgerr(file_dbp, pgno);
		goto out;
	}

	modified = 0;
	cmp_n = log_compare(lsnp, &LSN(meta));
	cmp_p = log_compare(&LSN(meta), &argp->meta_lsn);
	if (cmp_p == 0 && redo) {
		/* Need to redo update described. */
		meta->free = argp->pgno;

		meta->lsn = *lsnp;
		modified = 1;
	} else if (cmp_n == 0 && !redo) {
		/* Need to undo update described. */
		meta->free = argp->next;

		meta->lsn = argp->meta_lsn;
		modified = 1;
	}
	if ((ret = memp_fput(mpf, meta, modified ? DB_MPOOL_DIRTY : 0)) != 0) {
		(void)__db_panic(file_dbp);
		goto out;
	}

	*lsnp = argp->prev_lsn;
	ret = 0;

out:	REC_CLOSE;
}

/*
 * __bam_split_recover --
 *	Recovery function for split.
 *
 * PUBLIC: int __bam_split_recover
 * PUBLIC:   __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
 */
int
__bam_split_recover(logp, dbtp, lsnp, redo, info)
	DB_LOG *logp;
	DBT *dbtp;
	DB_LSN *lsnp;
	int redo;
	void *info;
{
	__bam_split_args *argp;
	DB *file_dbp, *mdbp;
	DB_MPOOLFILE *mpf;
	PAGE *_lp, *lp, *np, *pp, *_rp, *rp, *sp;
	db_pgno_t pgno;
	int l_update, p_update, r_update, ret, rootsplit, t_ret;

	REC_PRINT(__bam_split_print);

	mpf = NULL;
	_lp = lp = np = pp = _rp = rp = NULL;

	REC_INTRO(__bam_split_read);

	/*
	 * There are two kinds of splits that we have to recover from.  The
	 * first is a root-page split, where the root page is split from a
	 * leaf page into an internal page and two new leaf pages are created.
	 * The second is where a page is split into two pages, and a new key
	 * is inserted into the parent page.
	 */
	sp = argp->pg.data;
	pgno = PGNO(sp);
	rootsplit = pgno == PGNO_ROOT;
	if (memp_fget(mpf, &argp->left, 0, &lp) != 0)
		lp = NULL;
	if (memp_fget(mpf, &argp->right, 0, &rp) != 0)
		rp = NULL;

	if (redo) {
		l_update = r_update = p_update = 0;
		/*
		 * Decide if we need to resplit the page.
		 *
		 * If this is a root split, then the root has to exist, it's
		 * the page we're splitting and it gets modified.  If this is
		 * not a root split, then the left page has to exist, for the
		 * same reason.
		 */
		if (rootsplit) {
			if ((ret = memp_fget(mpf, &pgno, 0, &pp)) != 0) {
				(void)__db_pgerr(file_dbp, pgno);
				pp = NULL;
				goto out;
			}
			p_update =
			    log_compare(&LSN(pp), &LSN(argp->pg.data)) == 0;
		} else
			if (lp == NULL) {
				(void)__db_pgerr(file_dbp, argp->left);
				goto out;
			}
		if (lp == NULL || log_compare(&LSN(lp), &argp->llsn) == 0)
			l_update = 1;
		if (rp == NULL || log_compare(&LSN(rp), &argp->rlsn) == 0)
			r_update = 1;
		if (!p_update && !l_update && !r_update)
			goto done;

		/* Allocate and initialize new left/right child pages. */
		if ((_lp = (PAGE *)malloc(file_dbp->pgsize)) == NULL)
			goto nomem;
		if ((_rp = (PAGE *)malloc(file_dbp->pgsize)) == NULL) {
nomem:			errno = ENOMEM;
			__db_err(file_dbp->dbenv, "%s", strerror(errno));
			goto out;
		}
		if (rootsplit) {
			P_INIT(_lp, file_dbp->pgsize, argp->left,
			    PGNO_INVALID,
			    ISINTERNAL(sp) ? PGNO_INVALID : argp->right,
			    LEVEL(sp), TYPE(sp));
			P_INIT(_rp, file_dbp->pgsize, argp->right,
			    ISINTERNAL(sp) ?  PGNO_INVALID : argp->left,
			    PGNO_INVALID, LEVEL(sp), TYPE(sp));
		} else {
			P_INIT(_lp, file_dbp->pgsize, PGNO(sp),
			    ISINTERNAL(sp) ? PGNO_INVALID : PREV_PGNO(sp),
			    ISINTERNAL(sp) ? PGNO_INVALID : argp->right,
			    LEVEL(sp), TYPE(sp));
			P_INIT(_rp, file_dbp->pgsize, argp->right,
			    ISINTERNAL(sp) ? PGNO_INVALID : sp->pgno,
			    ISINTERNAL(sp) ? PGNO_INVALID : NEXT_PGNO(sp),
			    LEVEL(sp), TYPE(sp));
		}

		/* Split the page. */
		if ((ret = __bam_copy(file_dbp, sp, _lp, 0, argp->indx)) != 0 ||
		    (ret = __bam_copy(file_dbp, sp, _rp, argp->indx,
		    NUM_ENT(sp))) != 0)
			goto out;

		/* If the left child is wrong, update it. */
		if (lp == NULL && (ret =
		    memp_fget(mpf, &argp->left, DB_MPOOL_CREATE, &lp)) != 0) {
			(void)__db_pgerr(file_dbp, argp->left);
			lp = NULL;
			goto out;
		}
		if (l_update) {
			memcpy(lp, _lp, file_dbp->pgsize);
			lp->lsn = *lsnp;
			if ((ret = memp_fput(mpf, lp, DB_MPOOL_DIRTY)) != 0)
				goto fatal;
			lp = NULL;
		}

		/* If the right child is wrong, update it. */
		if (rp == NULL && (ret = memp_fget(mpf,
		    &argp->right, DB_MPOOL_CREATE, &rp)) != 0) {
			(void)__db_pgerr(file_dbp, argp->right);
			rp = NULL;
			goto out;
		}
		if (r_update) {
			memcpy(rp, _rp, file_dbp->pgsize);
			rp->lsn = *lsnp;
			if ((ret = memp_fput(mpf, rp, DB_MPOOL_DIRTY)) != 0)
				goto fatal;
			rp = NULL;
		}

		/*
		 * If the parent page is wrong, update it.  This is of interest
		 * only if it was a root split, since root splits create parent
		 * pages.  All other splits modify a parent page, but those are
		 * separately logged and recovered.
		 */
		if (rootsplit && p_update) {
			if (file_dbp->type == DB_BTREE)
				P_INIT(pp, file_dbp->pgsize,
				    PGNO_ROOT, PGNO_INVALID, PGNO_INVALID,
				    _lp->level + 1, P_IBTREE);
			else
				P_INIT(pp, file_dbp->pgsize,
				    PGNO_ROOT, PGNO_INVALID, PGNO_INVALID,
				    _lp->level + 1, P_IRECNO);
			RE_NREC_SET(pp,
			    file_dbp->type == DB_RECNO ||
			    F_ISSET(file_dbp, DB_BT_RECNUM) ?
			    __bam_total(_lp) + __bam_total(_rp) : 0);
			pp->lsn = *lsnp;
			if ((ret = memp_fput(mpf, pp, DB_MPOOL_DIRTY)) != 0)
				goto fatal;
			pp = NULL;
		}

		/*
		 * Finally, redo the next-page link if necessary.  This is of
		 * interest only if it wasn't a root split -- inserting a new
		 * page in the tree requires that any following page have its
		 * previous-page pointer updated to our new page.  The next
		 * page had better exist.
		 */
		if (!rootsplit && !IS_ZERO_LSN(argp->nlsn)) {
			if ((ret = memp_fget(mpf, &argp->npgno, 0, &np)) != 0) {
				(void)__db_pgerr(file_dbp, argp->npgno);
				np = NULL;
				goto out;
			}
			if (log_compare(&LSN(np), &argp->nlsn) == 0) {
				PREV_PGNO(np) = argp->right;
				np->lsn = *lsnp;
				if ((ret = memp_fput(mpf,
				    np, DB_MPOOL_DIRTY)) != 0)
					goto fatal;
				np = NULL;
			}
		}
	} else {
		/*
		 * If the split page is wrong, replace its contents with the
		 * logged page contents.  The split page had better exist.
		 */
		if ((ret = memp_fget(mpf, &pgno, 0, &pp)) != 0) {
			(void)__db_pgerr(file_dbp, pgno);
			pp = NULL;
			goto out;
		}
		if (log_compare(lsnp, &LSN(pp)) == 0) {
			memcpy(pp, argp->pg.data, argp->pg.size);
			if ((ret = memp_fput(mpf, pp, DB_MPOOL_DIRTY)) != 0)
				goto fatal;
			pp = NULL;
		}

		/*
		 * If it's a root split and the left child ever existed, put
		 * it on the free list.  (If it's not a root split, we just
		 * updated the left page -- it's the same as the split page.)
		 * If the right child ever existed, root split or not, put it
		 * on the free list.
		 */
		if ((rootsplit && lp != NULL) || rp != NULL) {
			if (rootsplit && lp != NULL &&
			    log_compare(lsnp, &LSN(lp)) == 0) {
				lp->lsn = argp->llsn;
				if ((ret =
				    memp_fput(mpf, lp, DB_MPOOL_DIRTY)) != 0)
					goto fatal;
				lp = NULL;
			}
			if (rp != NULL &&
			    log_compare(lsnp, &LSN(rp)) == 0) {
				rp->lsn = argp->rlsn;
				if ((ret =
				    memp_fput(mpf, rp, DB_MPOOL_DIRTY)) != 0)
					goto fatal;
				rp = NULL;
			}
		}

		/*
		 * Finally, undo the next-page link if necessary.  This is of
		 * interest only if it wasn't a root split -- inserting a new
		 * page in the tree requires that any following page have its
		 * previous-page pointer updated to our new page.  The next
		 * page had better exist.
		 */
		if (!rootsplit && !IS_ZERO_LSN(argp->nlsn)) {
			if ((ret = memp_fget(mpf, &argp->npgno, 0, &np)) != 0) {
				(void)__db_pgerr(file_dbp, argp->npgno);
				np = NULL;
				goto out;
			}
			if (log_compare(lsnp, &LSN(np)) == 0) {
				PREV_PGNO(np) = argp->left;
				np->lsn = argp->nlsn;
				if (memp_fput(mpf, np, DB_MPOOL_DIRTY))
					goto fatal;
				np = NULL;
			}
		}
	}

done:	ret = 0;
	*lsnp = argp->prev_lsn;

	if (0) {
fatal:		(void)__db_panic(file_dbp);
	}
out:	/* Free any pages that weren't dirtied. */
	if (pp != NULL && (t_ret = memp_fput(mpf, pp, 0)) != 0 && ret == 0)
		ret = t_ret;
	if (lp != NULL && (t_ret = memp_fput(mpf, lp, 0)) != 0 && ret == 0)
		ret = t_ret;
	if (np != NULL && (t_ret = memp_fput(mpf, np, 0)) != 0 && ret == 0)
		ret = t_ret;
	if (rp != NULL && (t_ret = memp_fput(mpf, rp, 0)) != 0 && ret == 0)
		ret = t_ret;

	/* Free any allocated space. */
	if (_lp != NULL)
		free(_lp);
	if (_rp != NULL)
		free(_rp);

	REC_CLOSE;
}

/*
 * __bam_rsplit_recover --
 *	Recovery function for a reverse split.
 *
 * PUBLIC: int __bam_rsplit_recover
 * PUBLIC:   __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
 */
int
__bam_rsplit_recover(logp, dbtp, lsnp, redo, info)
	DB_LOG *logp;
	DBT *dbtp;
	DB_LSN *lsnp;
	int redo;
	void *info;
{
	__bam_rsplit_args *argp;
	DB *file_dbp, *mdbp;
	DB_MPOOLFILE *mpf;
	PAGE *pagep;
	db_pgno_t pgno;
	int cmp_n, cmp_p, modified, ret;

	REC_PRINT(__bam_rsplit_print);
	REC_INTRO(__bam_rsplit_read);

	/* Fix the root page. */
	pgno = PGNO_ROOT;
	if ((ret = memp_fget(mpf, &pgno, 0, &pagep)) != 0) {
		__db_pgerr(file_dbp, pgno);
		pagep = NULL;
		goto out;
	}
	modified = 0;
	cmp_n = log_compare(lsnp, &LSN(pagep));
	cmp_p = log_compare(&LSN(pagep), &argp->rootlsn);
	if (cmp_p == 0 && redo) {
		/* Need to redo update described. */
		memcpy(pagep, argp->pgdbt.data, argp->pgdbt.size);
		pagep->pgno = PGNO_ROOT;
		pagep->lsn = *lsnp;
		modified = 1;
	} else if (cmp_n == 0 && !redo) {
		/* Need to undo update described. */
		P_INIT(pagep, file_dbp->pgsize, PGNO_ROOT,
		    PGNO_INVALID, PGNO_INVALID, pagep->level + 1, TYPE(pagep));
		if ((ret = __db_pitem(file_dbp, pagep, 0,
		    argp->rootent.size, &argp->rootent, NULL)) != 0)
			goto out;
		pagep->lsn = argp->rootlsn;
		modified = 1;
	}
	if ((ret = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0) {
		(void)__db_panic(file_dbp);
		goto out;
	}

	/* Fix the page copied over the root page. */
	if ((ret = memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
		(void)__db_pgerr(file_dbp, argp->pgno);
		pagep = NULL;
		goto out;
	}
	modified = 0;
	cmp_n = log_compare(lsnp, &LSN(pagep));
	cmp_p = log_compare(&LSN(pagep), &LSN(argp->pgdbt.data));
	if (cmp_p == 0 && redo) {
		/* Need to redo update described. */
		pagep->lsn = *lsnp;
		modified = 1;
	} else if (cmp_n == 0 && !redo) {
		/* Need to undo update described. */
		memcpy(pagep, argp->pgdbt.data, argp->pgdbt.size);
		modified = 1;
	}
	if ((ret = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0) {
		(void)__db_panic(file_dbp);
		goto out;
	}

	ret = 0;
	*lsnp = argp->prev_lsn;

out:	REC_CLOSE;
}

/*
 * __bam_adj_recover --
 *	Recovery function for adj.
 *
 * PUBLIC: int __bam_adj_recover
 * PUBLIC:   __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
 */
int
__bam_adj_recover(logp, dbtp, lsnp, redo, info)
	DB_LOG *logp;
	DBT *dbtp;
	DB_LSN *lsnp;
	int redo;
	void *info;
{
	__bam_adj_args *argp;
	DB *file_dbp, *mdbp;
	DB_MPOOLFILE *mpf;
	PAGE *pagep;
	int cmp_n, cmp_p, modified, ret;

	REC_PRINT(__bam_adj_print);
	REC_INTRO(__bam_adj_read);

	if ((ret = memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
		(void)__db_pgerr(file_dbp, argp->pgno);
		pagep = NULL;
		goto out;
	}

	modified = 0;
	cmp_n = log_compare(lsnp, &LSN(pagep));
	cmp_p = log_compare(&LSN(pagep), &argp->lsn);
	if (cmp_p == 0 && redo) {
		/* Need to redo update described. */
		if ((ret = __bam_adjindx(file_dbp,
		    pagep, argp->indx, argp->indx_copy, argp->is_insert)) != 0)
			goto err;

		LSN(pagep) = *lsnp;
		modified = 1;
	} else if (cmp_n == 0 && !redo) {
		/* Need to undo update described. */
		if ((ret = __bam_adjindx(file_dbp,
		    pagep, argp->indx, argp->indx_copy, !argp->is_insert)) != 0)
			goto err;

		LSN(pagep) = argp->lsn;
		modified = 1;
	}
	if ((ret = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) == 0)
		*lsnp = argp->prev_lsn;

	if (0) {
err:		(void)memp_fput(mpf, pagep, 0);
	}
out:	REC_CLOSE;
}

/*
 * __bam_cadjust_recover --
 *	Recovery function for the adjust of a count change in an internal
 *	page.
 *
 * PUBLIC: int __bam_cadjust_recover
 * PUBLIC:   __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
 */
int
__bam_cadjust_recover(logp, dbtp, lsnp, redo, info)
	DB_LOG *logp;
	DBT *dbtp;
	DB_LSN *lsnp;
	int redo;
	void *info;
{
	__bam_cadjust_args *argp;
	DB *file_dbp, *mdbp;
	DB_MPOOLFILE *mpf;
	PAGE *pagep;
	int cmp_n, cmp_p, modified, ret;

	REC_PRINT(__bam_cadjust_print);
	REC_INTRO(__bam_cadjust_read);

	if ((ret = memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
		errno = __db_pgerr(file_dbp, argp->pgno);
		pagep = NULL;
		goto out;
	}

	modified = 0;
	cmp_n = log_compare(lsnp, &LSN(pagep));
	cmp_p = log_compare(&LSN(pagep), &argp->lsn);
	if (cmp_p == 0 && redo) {
		/* Need to redo update described. */
		if (file_dbp->type == DB_BTREE &&
		    F_ISSET(file_dbp, DB_BT_RECNUM)) {
			GET_BINTERNAL(pagep, argp->indx)->nrecs += argp->adjust;
			if (argp->total && PGNO(pagep) == PGNO_ROOT)
				RE_NREC_ADJ(pagep, argp->adjust);
		}
		if (file_dbp->type == DB_RECNO) {
			GET_RINTERNAL(pagep, argp->indx)->nrecs += argp->adjust;
			if (argp->total && PGNO(pagep) == PGNO_ROOT)
				RE_NREC_ADJ(pagep, argp->adjust);
		}

		LSN(pagep) = *lsnp;
		modified = 1;
	} else if (cmp_n == 0 && !redo) {
		/* Need to undo update described. */
		if (file_dbp->type == DB_BTREE &&
		    F_ISSET(file_dbp, DB_BT_RECNUM)) {
			GET_BINTERNAL(pagep, argp->indx)->nrecs -= argp->adjust;
			if (argp->total && PGNO(pagep) == PGNO_ROOT)
				RE_NREC_ADJ(pagep, argp->adjust);
		}
		if (file_dbp->type == DB_RECNO) {
			GET_RINTERNAL(pagep, argp->indx)->nrecs -= argp->adjust;
			if (argp->total && PGNO(pagep) == PGNO_ROOT)
				RE_NREC_ADJ(pagep, -(argp->adjust));
		}
		LSN(pagep) = argp->lsn;
		modified = 1;
	}
	if ((ret = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) == 0)
		*lsnp = argp->prev_lsn;

out:	REC_CLOSE;
}

/*
 * __bam_cdel_recover --
 *	Recovery function for the intent-to-delete of a cursor record.
 *
 * PUBLIC: int __bam_cdel_recover
 * PUBLIC:   __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
 */
int
__bam_cdel_recover(logp, dbtp, lsnp, redo, info)
	DB_LOG *logp;
	DBT *dbtp;
	DB_LSN *lsnp;
	int redo;
	void *info;
{
	__bam_cdel_args *argp;
	DB *file_dbp, *mdbp;
	DB_MPOOLFILE *mpf;
	PAGE *pagep;
	int cmp_n, cmp_p, modified, ret;

	REC_PRINT(__bam_cdel_print);
	REC_INTRO(__bam_cdel_read);

	if ((ret = memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
		(void)__db_pgerr(file_dbp, argp->pgno);
		pagep = NULL;
		goto out;
	}

	modified = 0;
	cmp_n = log_compare(lsnp, &LSN(pagep));
	cmp_p = log_compare(&LSN(pagep), &argp->lsn);
	if (cmp_p == 0 && redo) {
		/* Need to redo update described. */
		GET_BKEYDATA(pagep, argp->indx + O_INDX)->deleted = 1;

		LSN(pagep) = *lsnp;
		modified = 1;
	} else if (cmp_n == 0 && !redo) {
		/* Need to undo update described. */
		GET_BKEYDATA(pagep, argp->indx + O_INDX)->deleted = 0;

		LSN(pagep) = argp->lsn;
		modified = 1;
	}
	if ((ret = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) == 0)
		*lsnp = argp->prev_lsn;

out:	REC_CLOSE;
}