txn_rec.c

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/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996, 1997, 1998, 1999, 2000
 *      Sleepycat Software.  All rights reserved.
 */
/*
 * Copyright (c) 1996
 *      The President and Fellows of Harvard University.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "config.h"

#ifndef lint
static const char revid[] = "$Id: txn__rec_8c-source.html,v 1.1 2008/06/08 10:24:57 sebdiaz Exp $";
#endif /* not lint */

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

#include <errno.h>
#endif

#include "db_int.h"
#include "db_page.h"
#include "txn.h"
#include "db_am.h"

/*
 * PUBLIC: int CDB___txn_regop_recover
 * PUBLIC:    __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 *
 * These records are only ever written for commits.  Normally, we redo any
 * committed transaction, however if we are doing recovery to a timestamp, then
 * we may treat transactions that commited after the timestamp as aborted.
 */
int
CDB___txn_regop_recover(dbenv, dbtp, lsnp, op, info)
        DB_ENV *dbenv;
        DBT *dbtp;
        DB_LSN *lsnp;
        db_recops op;
        void *info;
{
        __txn_regop_args *argp;
        int ret;

#ifdef DEBUG_RECOVER
        (void)CDB___txn_regop_print(dbenv, dbtp, lsnp, op, info);
#endif
        COMPQUIET(op, 0);

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

        if (argp->opcode != TXN_COMMIT)
                ret = EINVAL;
        else if (dbenv->tx_timestamp == 0 ||
            argp->timestamp <= (int32_t)dbenv->tx_timestamp)
                if (CDB___db_txnlist_find(info, argp->txnid->txnid) == DB_NOTFOUND)
                        ret = CDB___db_txnlist_add(dbenv, info, argp->txnid->txnid);

        if (ret == 0)
                *lsnp = argp->prev_lsn;
        CDB___os_free(argp, 0);

        return (ret);
}

/*
 * PUBLIC: int CDB___txn_xa_regop_recover
 * PUBLIC:    __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 *
 * These records are only ever written for prepares.
 */
int
CDB___txn_xa_regop_recover(dbenv, dbtp, lsnp, op, info)
        DB_ENV *dbenv;
        DBT *dbtp;
        DB_LSN *lsnp;
        db_recops op;
        void *info;
{
        __txn_xa_regop_args *argp;
        int ret;

#ifdef DEBUG_RECOVER
        (void)CDB___txn_xa_regop_print(dbenv, dbtp, lsnp, op, info);
#endif
        COMPQUIET(op, 0);
        COMPQUIET(dbenv, NULL);

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

        if (argp->opcode != TXN_PREPARE)
                ret = EINVAL;
        else
                /* Call CDB___db_txnlist_find so that we update the maxid. */
                (void)CDB___db_txnlist_find(info, argp->txnid->txnid);

        if (ret == 0)
                *lsnp = argp->prev_lsn;
        CDB___os_free(argp, 0);

        return (ret);
}

/*
 * PUBLIC: int CDB___txn_ckp_recover
 * PUBLIC: __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
CDB___txn_ckp_recover(dbenv, dbtp, lsnp, op, info)
        DB_ENV *dbenv;
        DBT *dbtp;
        DB_LSN *lsnp;
        db_recops op;
        void *info;
{
        __txn_ckp_args *argp;
        int ret;

#ifdef DEBUG_RECOVER
        CDB___txn_ckp_print(dbenv, dbtp, lsnp, op, info);
#endif
        COMPQUIET(dbenv, NULL);

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

        /*
         * Check for 'restart' checkpoint record.  This occurs when the
         * checkpoint lsn is equal to the lsn of the checkpoint record
         * and means that we could set the transaction ID back to 1, so
         * that we don't exhaust the transaction ID name space.
         */
        if (argp->ckp_lsn.file == lsnp->file &&
            argp->ckp_lsn.offset == lsnp->offset)
                CDB___db_txnlist_gen(info, DB_REDO(op) ? -1 : 1);

        *lsnp = argp->last_ckp;
        CDB___os_free(argp, 0);
        return (DB_TXN_CKP);
}

/*
 * CDB___txn_child_recover
 *      Recover a commit record for a child transaction.
 *
 * PUBLIC: int CDB___txn_child_recover
 * PUBLIC:    __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
CDB___txn_child_recover(dbenv, dbtp, lsnp, op, info)
        DB_ENV *dbenv;
        DBT *dbtp;
        DB_LSN *lsnp;
        db_recops op;
        void *info;
{
        __txn_child_args *argp;
        int ret;

#ifdef DEBUG_RECOVER
        (void)CDB___txn_child_print(dbenv, dbtp, lsnp, op, info);
#endif
        COMPQUIET(op, 0);
        COMPQUIET(dbenv, NULL);

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

        /*
         * We count the child as committed only if its parent committed.
         * So, if we are not yet in the transaction list, but our parent
         * is, then we should go ahead and commit.
         */
        if (argp->opcode != TXN_COMMIT)
                ret = EINVAL;
        else
                if (CDB___db_txnlist_find(info, argp->parent) == 0 &&
                    CDB___db_txnlist_find(info, argp->txnid->txnid) == DB_NOTFOUND)
                        ret = CDB___db_txnlist_add(dbenv, info, argp->txnid->txnid);

        if (ret == 0)
                *lsnp = argp->prev_lsn;
        CDB___os_free(argp, 0);

        return (ret);
}

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