db_rec.c 22.1 KB
Newer Older
unknown's avatar
unknown committed
1 2 3
/*-
 * See the file LICENSE for redistribution information.
 *
unknown's avatar
unknown committed
4
 * Copyright (c) 1996-2002
unknown's avatar
unknown committed
5 6 7 8 9 10
 *	Sleepycat Software.  All rights reserved.
 */

#include "db_config.h"

#ifndef lint
unknown's avatar
unknown committed
11
static const char revid[] = "$Id: db_rec.c,v 11.35 2002/08/08 03:57:49 bostic Exp $";
unknown's avatar
unknown committed
12 13 14 15 16 17 18 19 20
#endif /* not lint */

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

#include <string.h>
#endif

#include "db_int.h"
unknown's avatar
unknown committed
21 22 23
#include "dbinc/db_page.h"
#include "dbinc/log.h"
#include "dbinc/hash.h"
unknown's avatar
unknown committed
24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47

/*
 * PUBLIC: int __db_addrem_recover
 * PUBLIC:    __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 *
 * This log message is generated whenever we add or remove a duplicate
 * to/from a duplicate page.  On recover, we just do the opposite.
 */
int
__db_addrem_recover(dbenv, dbtp, lsnp, op, info)
	DB_ENV *dbenv;
	DBT *dbtp;
	DB_LSN *lsnp;
	db_recops op;
	void *info;
{
	__db_addrem_args *argp;
	DB *file_dbp;
	DBC *dbc;
	DB_MPOOLFILE *mpf;
	PAGE *pagep;
	u_int32_t change;
	int cmp_n, cmp_p, ret;

unknown's avatar
unknown committed
48
	pagep = NULL;
unknown's avatar
unknown committed
49 50 51 52
	COMPQUIET(info, NULL);
	REC_PRINT(__db_addrem_print);
	REC_INTRO(__db_addrem_read, 1);

unknown's avatar
unknown committed
53
	if ((ret = mpf->get(mpf, &argp->pgno, 0, &pagep)) != 0) {
unknown's avatar
unknown committed
54 55 56 57 58 59 60 61 62
		if (DB_UNDO(op)) {
			/*
			 * We are undoing and the page doesn't exist.  That
			 * is equivalent to having a pagelsn of 0, so we
			 * would not have to undo anything.  In this case,
			 * don't bother creating a page.
			 */
			goto done;
		} else
unknown's avatar
unknown committed
63
			if ((ret = mpf->get(mpf,
unknown's avatar
unknown committed
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
			    &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0)
				goto out;
	}

	cmp_n = log_compare(lsnp, &LSN(pagep));
	cmp_p = log_compare(&LSN(pagep), &argp->pagelsn);
	CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->pagelsn);
	change = 0;
	if ((cmp_p == 0 && DB_REDO(op) && argp->opcode == DB_ADD_DUP) ||
	    (cmp_n == 0 && DB_UNDO(op) && argp->opcode == DB_REM_DUP)) {

		/* Need to redo an add, or undo a delete. */
		if ((ret = __db_pitem(dbc, pagep, argp->indx, argp->nbytes,
		    argp->hdr.size == 0 ? NULL : &argp->hdr,
		    argp->dbt.size == 0 ? NULL : &argp->dbt)) != 0)
			goto out;

		change = DB_MPOOL_DIRTY;

	} else if ((cmp_n == 0 && DB_UNDO(op) && argp->opcode == DB_ADD_DUP) ||
	    (cmp_p == 0 && DB_REDO(op) && argp->opcode == DB_REM_DUP)) {
		/* Need to undo an add, or redo a delete. */
		if ((ret = __db_ditem(dbc,
		    pagep, argp->indx, argp->nbytes)) != 0)
			goto out;
		change = DB_MPOOL_DIRTY;
	}

	if (change) {
		if (DB_REDO(op))
			LSN(pagep) = *lsnp;
		else
			LSN(pagep) = argp->pagelsn;
	}

unknown's avatar
unknown committed
99
	if ((ret = mpf->put(mpf, pagep, change)) != 0)
unknown's avatar
unknown committed
100
		goto out;
unknown's avatar
unknown committed
101
	pagep = NULL;
unknown's avatar
unknown committed
102 103 104 105

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

unknown's avatar
unknown committed
106 107 108
out:	if (pagep != NULL)
		(void)mpf->put(mpf, pagep, 0);
	REC_CLOSE;
unknown's avatar
unknown committed
109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130
}

/*
 * PUBLIC: int __db_big_recover
 * PUBLIC:     __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__db_big_recover(dbenv, dbtp, lsnp, op, info)
	DB_ENV *dbenv;
	DBT *dbtp;
	DB_LSN *lsnp;
	db_recops op;
	void *info;
{
	__db_big_args *argp;
	DB *file_dbp;
	DBC *dbc;
	DB_MPOOLFILE *mpf;
	PAGE *pagep;
	u_int32_t change;
	int cmp_n, cmp_p, ret;

unknown's avatar
unknown committed
131
	pagep = NULL;
unknown's avatar
unknown committed
132 133 134 135
	COMPQUIET(info, NULL);
	REC_PRINT(__db_big_print);
	REC_INTRO(__db_big_read, 1);

unknown's avatar
unknown committed
136
	if ((ret = mpf->get(mpf, &argp->pgno, 0, &pagep)) != 0) {
unknown's avatar
unknown committed
137 138 139 140 141 142 143 144 145 146
		if (DB_UNDO(op)) {
			/*
			 * We are undoing and the page doesn't exist.  That
			 * is equivalent to having a pagelsn of 0, so we
			 * would not have to undo anything.  In this case,
			 * don't bother creating a page.
			 */
			ret = 0;
			goto ppage;
		} else
unknown's avatar
unknown committed
147
			if ((ret = mpf->get(mpf,
unknown's avatar
unknown committed
148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168
			    &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0)
				goto out;
	}

	/*
	 * There are three pages we need to check.  The one on which we are
	 * adding data, the previous one whose next_pointer may have
	 * been updated, and the next one whose prev_pointer may have
	 * been updated.
	 */
	cmp_n = log_compare(lsnp, &LSN(pagep));
	cmp_p = log_compare(&LSN(pagep), &argp->pagelsn);
	CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->pagelsn);
	change = 0;
	if ((cmp_p == 0 && DB_REDO(op) && argp->opcode == DB_ADD_BIG) ||
	    (cmp_n == 0 && DB_UNDO(op) && argp->opcode == DB_REM_BIG)) {
		/* We are either redo-ing an add, or undoing a delete. */
		P_INIT(pagep, file_dbp->pgsize, argp->pgno, argp->prev_pgno,
			argp->next_pgno, 0, P_OVERFLOW);
		OV_LEN(pagep) = argp->dbt.size;
		OV_REF(pagep) = 1;
unknown's avatar
unknown committed
169
		memcpy((u_int8_t *)pagep + P_OVERHEAD(file_dbp), argp->dbt.data,
unknown's avatar
unknown committed
170 171 172 173 174 175 176 177 178 179 180 181 182 183 184
		    argp->dbt.size);
		PREV_PGNO(pagep) = argp->prev_pgno;
		change = DB_MPOOL_DIRTY;
	} else if ((cmp_n == 0 && DB_UNDO(op) && argp->opcode == DB_ADD_BIG) ||
	    (cmp_p == 0 && DB_REDO(op) && argp->opcode == DB_REM_BIG)) {
		/*
		 * We are either undo-ing an add or redo-ing a delete.
		 * The page is about to be reclaimed in either case, so
		 * there really isn't anything to do here.
		 */
		change = DB_MPOOL_DIRTY;
	}
	if (change)
		LSN(pagep) = DB_REDO(op) ? *lsnp : argp->pagelsn;

unknown's avatar
unknown committed
185
	if ((ret = mpf->put(mpf, pagep, change)) != 0)
unknown's avatar
unknown committed
186
		goto out;
unknown's avatar
unknown committed
187 188 189 190 191 192 193 194
	pagep = NULL;

	/*
	 * We only delete a whole chain of overflow.
	 * Each page is handled individually
	 */
	if (argp->opcode == DB_REM_BIG)
		goto done;
unknown's avatar
unknown committed
195 196 197 198

	/* Now check the previous page. */
ppage:	if (argp->prev_pgno != PGNO_INVALID) {
		change = 0;
unknown's avatar
unknown committed
199
		if ((ret = mpf->get(mpf, &argp->prev_pgno, 0, &pagep)) != 0) {
unknown's avatar
unknown committed
200 201 202 203 204 205 206 207 208 209 210
			if (DB_UNDO(op)) {
				/*
				 * We are undoing and the page doesn't exist.
				 * That is equivalent to having a pagelsn of 0,
				 * so we would not have to undo anything.  In
				 * this case, don't bother creating a page.
				 */
				*lsnp = argp->prev_lsn;
				ret = 0;
				goto npage;
			} else
unknown's avatar
unknown committed
211
				if ((ret = mpf->get(mpf, &argp->prev_pgno,
unknown's avatar
unknown committed
212 213 214 215 216 217 218 219
				    DB_MPOOL_CREATE, &pagep)) != 0)
					goto out;
		}

		cmp_n = log_compare(lsnp, &LSN(pagep));
		cmp_p = log_compare(&LSN(pagep), &argp->prevlsn);
		CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->prevlsn);

unknown's avatar
unknown committed
220
		if (cmp_p == 0 && DB_REDO(op) && argp->opcode == DB_ADD_BIG) {
unknown's avatar
unknown committed
221 222 223
			/* Redo add, undo delete. */
			NEXT_PGNO(pagep) = argp->pgno;
			change = DB_MPOOL_DIRTY;
unknown's avatar
unknown committed
224 225
		} else if (cmp_n == 0 &&
		    DB_UNDO(op) && argp->opcode == DB_ADD_BIG) {
unknown's avatar
unknown committed
226 227 228 229 230 231
			/* Redo delete, undo add. */
			NEXT_PGNO(pagep) = argp->next_pgno;
			change = DB_MPOOL_DIRTY;
		}
		if (change)
			LSN(pagep) = DB_REDO(op) ? *lsnp : argp->prevlsn;
unknown's avatar
unknown committed
232
		if ((ret = mpf->put(mpf, pagep, change)) != 0)
unknown's avatar
unknown committed
233 234
			goto out;
	}
unknown's avatar
unknown committed
235
	pagep = NULL;
unknown's avatar
unknown committed
236 237 238 239

	/* Now check the next page.  Can only be set on a delete. */
npage:	if (argp->next_pgno != PGNO_INVALID) {
		change = 0;
unknown's avatar
unknown committed
240
		if ((ret = mpf->get(mpf, &argp->next_pgno, 0, &pagep)) != 0) {
unknown's avatar
unknown committed
241 242 243 244 245 246 247 248 249
			if (DB_UNDO(op)) {
				/*
				 * We are undoing and the page doesn't exist.
				 * That is equivalent to having a pagelsn of 0,
				 * so we would not have to undo anything.  In
				 * this case, don't bother creating a page.
				 */
				goto done;
			} else
unknown's avatar
unknown committed
250
				if ((ret = mpf->get(mpf, &argp->next_pgno,
unknown's avatar
unknown committed
251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266
				    DB_MPOOL_CREATE, &pagep)) != 0)
					goto out;
		}

		cmp_n = log_compare(lsnp, &LSN(pagep));
		cmp_p = log_compare(&LSN(pagep), &argp->nextlsn);
		CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->nextlsn);
		if (cmp_p == 0 && DB_REDO(op)) {
			PREV_PGNO(pagep) = PGNO_INVALID;
			change = DB_MPOOL_DIRTY;
		} else if (cmp_n == 0 && DB_UNDO(op)) {
			PREV_PGNO(pagep) = argp->pgno;
			change = DB_MPOOL_DIRTY;
		}
		if (change)
			LSN(pagep) = DB_REDO(op) ? *lsnp : argp->nextlsn;
unknown's avatar
unknown committed
267
		if ((ret = mpf->put(mpf, pagep, change)) != 0)
unknown's avatar
unknown committed
268 269
			goto out;
	}
unknown's avatar
unknown committed
270
	pagep = NULL;
unknown's avatar
unknown committed
271 272 273 274

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

unknown's avatar
unknown committed
275 276 277
out:	if (pagep != NULL)
		(void)mpf->put(mpf, pagep, 0);
	REC_CLOSE;
unknown's avatar
unknown committed
278 279 280 281 282 283
}

/*
 * __db_ovref_recover --
 *	Recovery function for __db_ovref().
 *
unknown's avatar
unknown committed
284 285
 * PUBLIC: int __db_ovref_recover
 * PUBLIC:     __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
unknown's avatar
unknown committed
286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301
 */
int
__db_ovref_recover(dbenv, dbtp, lsnp, op, info)
	DB_ENV *dbenv;
	DBT *dbtp;
	DB_LSN *lsnp;
	db_recops op;
	void *info;
{
	__db_ovref_args *argp;
	DB *file_dbp;
	DBC *dbc;
	DB_MPOOLFILE *mpf;
	PAGE *pagep;
	int cmp, modified, ret;

unknown's avatar
unknown committed
302
	pagep = NULL;
unknown's avatar
unknown committed
303 304 305 306
	COMPQUIET(info, NULL);
	REC_PRINT(__db_ovref_print);
	REC_INTRO(__db_ovref_read, 1);

unknown's avatar
unknown committed
307
	if ((ret = mpf->get(mpf, &argp->pgno, 0, &pagep)) != 0) {
unknown's avatar
unknown committed
308 309
		if (DB_UNDO(op))
			goto done;
unknown's avatar
unknown committed
310
		__db_pgerr(file_dbp, argp->pgno, ret);
unknown's avatar
unknown committed
311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329
		goto out;
	}

	modified = 0;
	cmp = log_compare(&LSN(pagep), &argp->lsn);
	CHECK_LSN(op, cmp, &LSN(pagep), &argp->lsn);
	if (cmp == 0 && DB_REDO(op)) {
		/* Need to redo update described. */
		OV_REF(pagep) += argp->adjust;

		pagep->lsn = *lsnp;
		modified = 1;
	} else if (log_compare(lsnp, &LSN(pagep)) == 0 && DB_UNDO(op)) {
		/* Need to undo update described. */
		OV_REF(pagep) -= argp->adjust;

		pagep->lsn = argp->lsn;
		modified = 1;
	}
unknown's avatar
unknown committed
330
	if ((ret = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
unknown's avatar
unknown committed
331
		goto out;
unknown's avatar
unknown committed
332
	pagep = NULL;
unknown's avatar
unknown committed
333 334 335 336

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

unknown's avatar
unknown committed
337 338 339
out:	if (pagep != NULL)
		(void)mpf->put(mpf, pagep, 0);
	REC_CLOSE;
unknown's avatar
unknown committed
340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363
}

/*
 * __db_relink_recover --
 *	Recovery function for relink.
 *
 * PUBLIC: int __db_relink_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__db_relink_recover(dbenv, dbtp, lsnp, op, info)
	DB_ENV *dbenv;
	DBT *dbtp;
	DB_LSN *lsnp;
	db_recops op;
	void *info;
{
	__db_relink_args *argp;
	DB *file_dbp;
	DBC *dbc;
	DB_MPOOLFILE *mpf;
	PAGE *pagep;
	int cmp_n, cmp_p, modified, ret;

unknown's avatar
unknown committed
364
	pagep = NULL;
unknown's avatar
unknown committed
365 366 367 368 369 370 371 372 373 374
	COMPQUIET(info, NULL);
	REC_PRINT(__db_relink_print);
	REC_INTRO(__db_relink_read, 1);

	/*
	 * There are up to three pages we need to check -- the page, and the
	 * previous and next pages, if they existed.  For a page add operation,
	 * the current page is the result of a split and is being recovered
	 * elsewhere, so all we need do is recover the next page.
	 */
unknown's avatar
unknown committed
375
	if ((ret = mpf->get(mpf, &argp->pgno, 0, &pagep)) != 0) {
unknown's avatar
unknown committed
376
		if (DB_REDO(op)) {
unknown's avatar
unknown committed
377
			__db_pgerr(file_dbp, argp->pgno, ret);
unknown's avatar
unknown committed
378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399
			goto out;
		}
		goto next2;
	}
	modified = 0;
	if (argp->opcode == DB_ADD_PAGE)
		goto next1;

	cmp_p = log_compare(&LSN(pagep), &argp->lsn);
	CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->lsn);
	if (cmp_p == 0 && DB_REDO(op)) {
		/* Redo the relink. */
		pagep->lsn = *lsnp;
		modified = 1;
	} else if (log_compare(lsnp, &LSN(pagep)) == 0 && DB_UNDO(op)) {
		/* Undo the relink. */
		pagep->next_pgno = argp->next;
		pagep->prev_pgno = argp->prev;

		pagep->lsn = argp->lsn;
		modified = 1;
	}
unknown's avatar
unknown committed
400
next1:	if ((ret = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
unknown's avatar
unknown committed
401
		goto out;
unknown's avatar
unknown committed
402
	pagep = NULL;
unknown's avatar
unknown committed
403

unknown's avatar
unknown committed
404
next2:	if ((ret = mpf->get(mpf, &argp->next, 0, &pagep)) != 0) {
unknown's avatar
unknown committed
405
		if (DB_REDO(op)) {
unknown's avatar
unknown committed
406
			__db_pgerr(file_dbp, argp->next, ret);
unknown's avatar
unknown committed
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
			goto out;
		}
		goto prev;
	}
	modified = 0;
	cmp_n = log_compare(lsnp, &LSN(pagep));
	cmp_p = log_compare(&LSN(pagep), &argp->lsn_next);
	CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->lsn_next);
	if ((argp->opcode == DB_REM_PAGE && cmp_p == 0 && DB_REDO(op)) ||
	    (argp->opcode == DB_ADD_PAGE && cmp_n == 0 && DB_UNDO(op))) {
		/* Redo the remove or undo the add. */
		pagep->prev_pgno = argp->prev;

		modified = 1;
	} else if ((argp->opcode == DB_REM_PAGE && cmp_n == 0 && DB_UNDO(op)) ||
	    (argp->opcode == DB_ADD_PAGE && cmp_p == 0 && DB_REDO(op))) {
		/* Undo the remove or redo the add. */
		pagep->prev_pgno = argp->pgno;

		modified = 1;
	}
	if (modified == 1) {
		if (DB_UNDO(op))
			pagep->lsn = argp->lsn_next;
		else
			pagep->lsn = *lsnp;
	}
unknown's avatar
unknown committed
434
	if ((ret = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
unknown's avatar
unknown committed
435
		goto out;
unknown's avatar
unknown committed
436
	pagep = NULL;
unknown's avatar
unknown committed
437 438 439
	if (argp->opcode == DB_ADD_PAGE)
		goto done;

unknown's avatar
unknown committed
440
prev:	if ((ret = mpf->get(mpf, &argp->prev, 0, &pagep)) != 0) {
unknown's avatar
unknown committed
441
		if (DB_REDO(op)) {
unknown's avatar
unknown committed
442
			__db_pgerr(file_dbp, argp->prev, ret);
unknown's avatar
unknown committed
443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466
			goto out;
		}
		goto done;
	}
	modified = 0;
	cmp_p = log_compare(&LSN(pagep), &argp->lsn_prev);
	CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->lsn_prev);
	if (cmp_p == 0 && DB_REDO(op)) {
		/* Redo the relink. */
		pagep->next_pgno = argp->next;

		modified = 1;
	} else if (log_compare(lsnp, &LSN(pagep)) == 0 && DB_UNDO(op)) {
		/* Undo the relink. */
		pagep->next_pgno = argp->pgno;

		modified = 1;
	}
	if (modified == 1) {
		if (DB_UNDO(op))
			pagep->lsn = argp->lsn_prev;
		else
			pagep->lsn = *lsnp;
	}
unknown's avatar
unknown committed
467
	if ((ret = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
unknown's avatar
unknown committed
468
		goto out;
unknown's avatar
unknown committed
469
	pagep = NULL;
unknown's avatar
unknown committed
470 471 472 473

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

unknown's avatar
unknown committed
474 475 476
out:	if (pagep != NULL)
		(void)mpf->put(mpf, pagep, 0);
	REC_CLOSE;
unknown's avatar
unknown committed
477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497
}

/*
 * __db_debug_recover --
 *	Recovery function for debug.
 *
 * PUBLIC: int __db_debug_recover __P((DB_ENV *,
 * PUBLIC:     DBT *, DB_LSN *, db_recops, void *));
 */
int
__db_debug_recover(dbenv, dbtp, lsnp, op, info)
	DB_ENV *dbenv;
	DBT *dbtp;
	DB_LSN *lsnp;
	db_recops op;
	void *info;
{
	__db_debug_args *argp;
	int ret;

	COMPQUIET(dbenv, NULL);
unknown's avatar
unknown committed
498
	COMPQUIET(op, DB_TXN_ABORT);
unknown's avatar
unknown committed
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
	COMPQUIET(info, NULL);

	REC_PRINT(__db_debug_print);
	REC_NOOP_INTRO(__db_debug_read);

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

	REC_NOOP_CLOSE;
}

/*
 * __db_noop_recover --
 *	Recovery function for noop.
 *
 * PUBLIC: int __db_noop_recover __P((DB_ENV *,
 * PUBLIC:      DBT *, DB_LSN *, db_recops, void *));
 */
int
__db_noop_recover(dbenv, dbtp, lsnp, op, info)
	DB_ENV *dbenv;
	DBT *dbtp;
	DB_LSN *lsnp;
	db_recops op;
	void *info;
{
	__db_noop_args *argp;
	DB *file_dbp;
	DBC *dbc;
	DB_MPOOLFILE *mpf;
	PAGE *pagep;
	u_int32_t change;
	int cmp_n, cmp_p, ret;

unknown's avatar
unknown committed
533
	pagep = NULL;
unknown's avatar
unknown committed
534 535 536 537
	COMPQUIET(info, NULL);
	REC_PRINT(__db_noop_print);
	REC_INTRO(__db_noop_read, 0);

unknown's avatar
unknown committed
538
	if ((ret = mpf->get(mpf, &argp->pgno, 0, &pagep)) != 0)
unknown's avatar
unknown committed
539 540 541 542 543 544 545 546 547 548 549 550 551
		goto out;

	cmp_n = log_compare(lsnp, &LSN(pagep));
	cmp_p = log_compare(&LSN(pagep), &argp->prevlsn);
	CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->prevlsn);
	change = 0;
	if (cmp_p == 0 && DB_REDO(op)) {
		LSN(pagep) = *lsnp;
		change = DB_MPOOL_DIRTY;
	} else if (cmp_n == 0 && DB_UNDO(op)) {
		LSN(pagep) = argp->prevlsn;
		change = DB_MPOOL_DIRTY;
	}
unknown's avatar
unknown committed
552 553
	ret = mpf->put(mpf, pagep, change);
	pagep = NULL;
unknown's avatar
unknown committed
554 555

done:	*lsnp = argp->prev_lsn;
unknown's avatar
unknown committed
556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896
out:	if (pagep != NULL)
		(void)mpf->put(mpf, pagep, 0);
	REC_CLOSE;
}

/*
 * __db_pg_alloc_recover --
 *	Recovery function for pg_alloc.
 *
 * PUBLIC: int __db_pg_alloc_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__db_pg_alloc_recover(dbenv, dbtp, lsnp, op, info)
	DB_ENV *dbenv;
	DBT *dbtp;
	DB_LSN *lsnp;
	db_recops op;
	void *info;
{
	__db_pg_alloc_args *argp;
	DB *file_dbp;
	DBC *dbc;
	DBMETA *meta;
	DB_MPOOLFILE *mpf;
	PAGE *pagep;
	db_pgno_t pgno;
	int cmp_n, cmp_p, created, level, modified, ret;

	meta = NULL;
	pagep = NULL;
	REC_PRINT(__db_pg_alloc_print);
	REC_INTRO(__db_pg_alloc_read, 0);

	/*
	 * 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_BASE_MD;
	if ((ret = mpf->get(mpf, &pgno, 0, &meta)) != 0) {
		/* The metadata page must always exist on redo. */
		if (DB_REDO(op)) {
			__db_pgerr(file_dbp, pgno, ret);
			goto out;
		} else
			goto done;
	}
	created = modified = 0;
	if ((ret = mpf->get(mpf, &argp->pgno, 0, &pagep)) != 0) {
		/*
		 * We have to be able to identify if a page was newly
		 * created so we can recover it properly.  We cannot simply
		 * look for an empty header, because hash uses a pgin
		 * function that will set the header.  Instead, we explicitly
		 * try for the page without CREATE and if that fails, then
		 * create it.
		 */
		if ((ret =
		    mpf->get(mpf, &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0) {
			__db_pgerr(file_dbp, argp->pgno, ret);
			goto out;
		}
		created = modified = 1;
	}

	/* Fix up the allocated page. */
	cmp_n = log_compare(lsnp, &LSN(pagep));
	cmp_p = log_compare(&LSN(pagep), &argp->page_lsn);

	/*
	 * If an inital allocation is aborted and then reallocated
	 * during an archival restore the log record will have
	 * an LSN for the page but the page will be empty.
	 */
	if (IS_ZERO_LSN(LSN(pagep)))
		cmp_p = 0;
	CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->page_lsn);
	/*
	 * If we we rolled back this allocation previously during an
	 * archive restore, the page may have the LSN of the meta page
	 * at the point of the roll back.  This will be no more
	 * than the LSN of the metadata page at the time of this allocation.
	 * Another special case we have to handle is if we ended up with a
	 * page of all 0's which can happen if we abort between allocating a
	 * page in mpool and initializing it.  In that case, even if we're
	 * undoing, we need to re-initialize the page.
	 */
	if (DB_REDO(op) &&
	    (cmp_p == 0 ||
	    (IS_ZERO_LSN(argp->page_lsn) &&
	    log_compare(&LSN(pagep), &argp->meta_lsn) <= 0))) {
		/* Need to redo update described. */
		switch (argp->ptype) {
		case P_LBTREE:
		case P_LRECNO:
		case P_LDUP:
			level = LEAFLEVEL;
			break;
		default:
			level = 0;
			break;
		}
		P_INIT(pagep, file_dbp->pgsize,
		    argp->pgno, PGNO_INVALID, PGNO_INVALID, level, argp->ptype);

		pagep->lsn = *lsnp;
		modified = 1;
	} else if (DB_UNDO(op) && (cmp_n == 0 || created)) {
		/*
		 * This is where we handle the case of a 0'd page (pagep->pgno
		 * is equal to PGNO_INVALID).
		 * Undo the allocation, reinitialize the page and
		 * link its next pointer to the free list.
		 */
		P_INIT(pagep, file_dbp->pgsize,
		    argp->pgno, PGNO_INVALID, argp->next, 0, P_INVALID);

		pagep->lsn = argp->page_lsn;
		modified = 1;
	}

	/*
	 * If the page was newly created, put it on the limbo list.
	 */
	if (IS_ZERO_LSN(LSN(pagep)) &&
	    IS_ZERO_LSN(argp->page_lsn) && DB_UNDO(op)) {
		/* Put the page in limbo.*/
		if ((ret = __db_add_limbo(dbenv,
		    info, argp->fileid, argp->pgno, 1)) != 0)
			goto out;
	}

	if ((ret = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
		goto out;
	pagep = NULL;

	/* Fix up the metadata page. */
	modified = 0;
	cmp_n = log_compare(lsnp, &LSN(meta));
	cmp_p = log_compare(&LSN(meta), &argp->meta_lsn);
	CHECK_LSN(op, cmp_p, &LSN(meta), &argp->meta_lsn);
	if (cmp_p == 0 && DB_REDO(op)) {
		/* Need to redo update described. */
		LSN(meta) = *lsnp;
		meta->free = argp->next;
		modified = 1;
	} else if (cmp_n == 0 && DB_UNDO(op)) {
		/* Need to undo update described. */
		LSN(meta) = argp->meta_lsn;

		/*
		 * If the page has a zero LSN then its newly created
		 * and will go into limbo rather than directly on the
		 * free list.
		 */
		if (!IS_ZERO_LSN(argp->page_lsn))
			meta->free = argp->pgno;
		modified = 1;
	}
	if ((ret = mpf->put(mpf, meta, modified ? DB_MPOOL_DIRTY : 0)) != 0)
		goto out;
	meta = NULL;
	/*
	 * This could be the metapage from a subdb which is read from disk
	 * to recover its creation.
	 */
	if (F_ISSET(file_dbp, DB_AM_SUBDB))
		switch (argp->type) {
		case P_BTREEMETA:
		case P_HASHMETA:
		case P_QAMMETA:
			file_dbp->sync(file_dbp, 0);
			break;
		}

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

out:	if (pagep != NULL)
		(void)mpf->put(mpf, pagep, 0);
	if (meta != NULL)
		(void)mpf->put(mpf, meta, 0);
	if (ret == ENOENT && op == DB_TXN_BACKWARD_ALLOC)
		ret = 0;
	REC_CLOSE;
}

/*
 * __db_pg_free_recover --
 *	Recovery function for pg_free.
 *
 * PUBLIC: int __db_pg_free_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__db_pg_free_recover(dbenv, dbtp, lsnp, op, info)
	DB_ENV *dbenv;
	DBT *dbtp;
	DB_LSN *lsnp;
	db_recops op;
	void *info;
{
	__db_pg_free_args *argp;
	DB *file_dbp;
	DBC *dbc;
	DBMETA *meta;
	DB_LSN copy_lsn;
	DB_MPOOLFILE *mpf;
	PAGE *pagep;
	db_pgno_t pgno;
	int cmp_n, cmp_p, modified, ret;

	COMPQUIET(info, NULL);
	meta = NULL;
	pagep = NULL;
	REC_PRINT(__db_pg_free_print);
	REC_INTRO(__db_pg_free_read, 1);

	/*
	 * 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.
	 * Create the page if necessary, we may be freeing an aborted
	 * create.
	 */
	if ((ret = mpf->get(mpf, &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0)
		goto out;
	modified = 0;
	(void)__ua_memcpy(&copy_lsn, &LSN(argp->header.data), sizeof(DB_LSN));
	cmp_n = log_compare(lsnp, &LSN(pagep));
	cmp_p = log_compare(&LSN(pagep), &copy_lsn);
	CHECK_LSN(op, cmp_p, &LSN(pagep), &copy_lsn);
	if (DB_REDO(op) &&
	    (cmp_p == 0 ||
	    (IS_ZERO_LSN(copy_lsn) &&
	    log_compare(&LSN(pagep), &argp->meta_lsn) <= 0))) {
		/* Need to redo update described. */
		P_INIT(pagep, file_dbp->pgsize,
		    argp->pgno, PGNO_INVALID, argp->next, 0, P_INVALID);
		pagep->lsn = *lsnp;

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

		modified = 1;
	}
	if ((ret = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
		goto out;
	pagep = NULL;

	/*
	 * 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_BASE_MD;
	if ((ret = mpf->get(mpf, &pgno, 0, &meta)) != 0) {
		/* The metadata page must always exist. */
		__db_pgerr(file_dbp, pgno, ret);
		goto out;
	}

	modified = 0;
	cmp_n = log_compare(lsnp, &LSN(meta));
	cmp_p = log_compare(&LSN(meta), &argp->meta_lsn);
	CHECK_LSN(op, cmp_p, &LSN(meta), &argp->meta_lsn);
	if (cmp_p == 0 && DB_REDO(op)) {
		/* Need to redo the deallocation. */
		meta->free = argp->pgno;
		LSN(meta) = *lsnp;
		modified = 1;
	} else if (cmp_n == 0 && DB_UNDO(op)) {
		/* Need to undo the deallocation. */
		meta->free = argp->next;
		LSN(meta) = argp->meta_lsn;
		modified = 1;
	}
	if ((ret = mpf->put(mpf, meta, modified ? DB_MPOOL_DIRTY : 0)) != 0)
		goto out;
	meta = NULL;

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

out:	if (pagep != NULL)
		(void)mpf->put(mpf, pagep, 0);
	if (meta != NULL)
		(void)mpf->put(mpf, meta, 0);
	REC_CLOSE;
}

/*
 * __db_cksum_recover --
 *	Recovery function for checksum failure log record.
 *
 * PUBLIC: int __db_cksum_recover __P((DB_ENV *,
 * PUBLIC:      DBT *, DB_LSN *, db_recops, void *));
 */
int
__db_cksum_recover(dbenv, dbtp, lsnp, op, info)
	DB_ENV *dbenv;
	DBT *dbtp;
	DB_LSN *lsnp;
	db_recops op;
	void *info;
{
	__db_cksum_args *argp;

	int ret;

	COMPQUIET(info, NULL);
	COMPQUIET(lsnp, NULL);
	COMPQUIET(op, DB_TXN_ABORT);

	REC_PRINT(__db_cksum_print);

	if ((ret = __db_cksum_read(dbenv, dbtp->data, &argp)) != 0)
		return (ret);

	/*
	 * We had a checksum failure -- the only option is to run catastrophic
	 * recovery.
	 */
	if (F_ISSET(dbenv, DB_ENV_FATAL))
		ret = 0;
	else {
		__db_err(dbenv,
		    "Checksum failure requires catastrophic recovery");
		ret = __db_panic(dbenv, DB_RUNRECOVERY);
	}

	__os_free(dbenv, argp);
	return (ret);
unknown's avatar
unknown committed
897
}