db_setlsn.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 2000-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: db_setlsn.c,v 12.8 2005/10/21 19:17:40 bostic Exp $
 */

#include "db_config.h"

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

#include "db_int.h"
#include "dbinc/db_page.h"
#include "dbinc/db_shash.h"
#include "dbinc/db_am.h"
#include "dbinc/mp.h"

static int __env_lsn_reset __P((DB_ENV *, const char *, int));

/*
 * __env_lsn_reset_pp --
 *      DB_ENV->lsn_reset pre/post processing.
 *
 * PUBLIC: int __env_lsn_reset_pp __P((DB_ENV *, const char *, u_int32_t));
 */
int
__env_lsn_reset_pp(dbenv, name, flags)
        DB_ENV *dbenv;
        const char *name;
        u_int32_t flags;
{
        DB_THREAD_INFO *ip;
        int handle_check, ret, t_ret;

        PANIC_CHECK(dbenv);
        ENV_ILLEGAL_BEFORE_OPEN(dbenv, "DB_ENV->lsn_reset");

        /*
         * !!!
         * The actual argument checking is simple, do it inline, outside of
         * the replication block.
         */
        if (flags != 0 && flags != DB_ENCRYPT)
                return (__db_ferr(dbenv, "DB_ENV->lsn_reset", 0));

        ENV_ENTER(dbenv, ip);

        /* Check for replication block. */
        handle_check = IS_ENV_REPLICATED(dbenv);
        if (handle_check && (ret = __env_rep_enter(dbenv, 1)) != 0)
                goto err;

        ret = __env_lsn_reset(dbenv, name, LF_ISSET(DB_ENCRYPT) ? 1 : 0);

        if (handle_check && (t_ret = __env_db_rep_exit(dbenv)) != 0 && ret == 0)
                ret = t_ret;

err:    ENV_LEAVE(dbenv, ip);
        return (ret);
}

/*
 * __env_lsn_reset --
 *      Reset the LSNs for every page in the file.
 */
static int
__env_lsn_reset(dbenv, name, encrypted)
        DB_ENV *dbenv;
        const char *name;
        int encrypted;
{
        DB *dbp;
        DB_MPOOLFILE *mpf;
        PAGE *pagep;
        db_pgno_t pgno;
        int t_ret, ret;

        /* Create the DB object. */
        if ((ret = db_create(&dbp, dbenv, 0)) != 0)
                return (ret);

        /* If configured with a password, the databases are encrypted. */
        if (encrypted && (ret = __db_set_flags(dbp, DB_ENCRYPT)) != 0)
                goto err;

        /*
         * Open the DB file.
         *
         * !!!
         * Note DB_RDWRMASTER flag, we need to open the master database file
         * for writing in this case.
         */
        if ((ret = __db_open(dbp, NULL,
            name, NULL, DB_UNKNOWN, DB_RDWRMASTER, 0, PGNO_BASE_MD)) != 0)
                goto err;

        /* Reset the LSN on every page of the database file. */
        mpf = dbp->mpf;
        for (pgno = 0;
            (ret = __memp_fget(mpf, &pgno, 0, &pagep)) == 0; ++pgno) {
                LSN_NOT_LOGGED(pagep->lsn);
                if ((ret = __memp_fput(mpf, pagep, DB_MPOOL_DIRTY)) != 0)
                        goto err;
        }

        if (ret == DB_PAGE_NOTFOUND)
                ret = 0;

err:    if ((t_ret = __db_close(dbp, NULL, 0)) != 0 && ret == 0)
                ret = t_ret;
        return (ret);
}

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