path: root/db2/db/db_rec.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996, 1997, 1998
 *	Sleepycat Software.  All rights reserved.
 */

#include "config.h"

#ifndef lint
static const char sccsid[] = "@(#)db_rec.c	10.19 (Sleepycat) 9/27/98";
#endif /* not lint */

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

#include <string.h>
#endif

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

/*
 * PUBLIC: int __db_addrem_recover
 * PUBLIC:    __P((DB_LOG *, DBT *, DB_LSN *, int, 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(logp, dbtp, lsnp, redo, info)
	DB_LOG *logp;
	DBT *dbtp;
	DB_LSN *lsnp;
	int redo;
	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;

	REC_PRINT(__db_addrem_print);
	REC_INTRO(__db_addrem_read);

	if ((ret = memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
		if (!redo) {
			/*
			 * 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
			if ((ret = memp_fget(mpf,
			    &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0)
				goto out;
	}

	cmp_n = log_compare(lsnp, &LSN(pagep));
	cmp_p = log_compare(&LSN(pagep), &argp->pagelsn);
	change = 0;
	if ((cmp_p == 0 && redo && argp->opcode == DB_ADD_DUP) ||
	    (cmp_n == 0 && !redo && 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 && !redo && argp->opcode == DB_ADD_DUP) ||
	    (cmp_p == 0 && redo && 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 (redo)
			LSN(pagep) = *lsnp;
		else
			LSN(pagep) = argp->pagelsn;
	}

	if ((ret = memp_fput(mpf, pagep, change)) != <