bt_upgrade.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: bt_upgrade.c,v 12.1 2005/06/16 20:20:23 bostic Exp $
 */
#include "db_config.h"

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

#include <string.h>
#endif

#include "db_int.h"
#include "dbinc/db_page.h"
#include "dbinc/db_upgrade.h"
#include "dbinc/btree.h"

/*
 * __bam_30_btreemeta --
 *      Upgrade the metadata pages from version 6 to version 7.
 *
 * PUBLIC: int __bam_30_btreemeta __P((DB *, char *, u_int8_t *));
 */
int
__bam_30_btreemeta(dbp, real_name, buf)
        DB *dbp;
        char *real_name;
        u_int8_t *buf;
{
        BTMETA30 *newmeta;
        BTMETA2X *oldmeta;
        DB_ENV *dbenv;
        int ret;

        dbenv = dbp->dbenv;

        newmeta = (BTMETA30 *)buf;
        oldmeta = (BTMETA2X *)buf;

        /*
         * Move things from the end up, so we do not overwrite things.
         * We are going to create a new uid, so we can move the stuff
         * at the end of the structure first, overwriting the uid.
         */

        newmeta->re_pad = oldmeta->re_pad;
        newmeta->re_len = oldmeta->re_len;
        newmeta->minkey = oldmeta->minkey;
        newmeta->maxkey = oldmeta->maxkey;
        newmeta->dbmeta.free = oldmeta->free;
        newmeta->dbmeta.flags = oldmeta->flags;
        newmeta->dbmeta.type  = P_BTREEMETA;

        newmeta->dbmeta.version = 7;
        /* Replace the unique ID. */
        if ((ret = __os_fileid(dbenv, real_name, 1, buf + 36)) != 0)
                return (ret);

        newmeta->root = 1;

        return (0);
}

/*
 * __bam_31_btreemeta --
 *      Upgrade the database from version 7 to version 8.
 *
 * PUBLIC: int __bam_31_btreemeta
 * PUBLIC:      __P((DB *, char *, u_int32_t, DB_FH *, PAGE *, int *));
 */
int
__bam_31_btreemeta(dbp, real_name, flags, fhp, h, dirtyp)
        DB *dbp;
        char *real_name;
        u_int32_t flags;
        DB_FH *fhp;
        PAGE *h;
        int *dirtyp;
{
        BTMETA31 *newmeta;
        BTMETA30 *oldmeta;

        COMPQUIET(dbp, NULL);
        COMPQUIET(real_name, NULL);
        COMPQUIET(fhp, NULL);

        newmeta = (BTMETA31 *)h;
        oldmeta = (BTMETA30 *)h;

        /*
         * Copy the effected fields down the page.
         * The fields may overlap each other so we
         * start at the bottom and use memmove.
         */
        newmeta->root = oldmeta->root;
        newmeta->re_pad = oldmeta->re_pad;
        newmeta->re_len = oldmeta->re_len;
        newmeta->minkey = oldmeta->minkey;
        newmeta->maxkey = oldmeta->maxkey;
        memmove(newmeta->dbmeta.uid,
            oldmeta->dbmeta.uid, sizeof(oldmeta->dbmeta.uid));
        newmeta->dbmeta.flags = oldmeta->dbmeta.flags;
        newmeta->dbmeta.record_count = 0;
        newmeta->dbmeta.key_count = 0;
        ZERO_LSN(newmeta->dbmeta.unused3);

        /* Set the version number. */
        newmeta->dbmeta.version = 8;

        /* Upgrade the flags. */
        if (LF_ISSET(DB_DUPSORT))
                F_SET(&newmeta->dbmeta, BTM_DUPSORT);

        *dirtyp = 1;
        return (0);
}

/*
 * __bam_31_lbtree --
 *      Upgrade the database btree leaf pages.
 *
 * PUBLIC: int __bam_31_lbtree
 * PUBLIC:      __P((DB *, char *, u_int32_t, DB_FH *, PAGE *, int *));
 */
int
__bam_31_lbtree(dbp, real_name, flags, fhp, h, dirtyp)
        DB *dbp;
        char *real_name;
        u_int32_t flags;
        DB_FH *fhp;
        PAGE *h;
        int *dirtyp;
{
        BKEYDATA *bk;
        db_pgno_t pgno;
        db_indx_t indx;
        int ret;

        ret = 0;
        for (indx = O_INDX; indx < NUM_ENT(h); indx += P_INDX) {
                bk = GET_BKEYDATA(dbp, h, indx);
                if (B_TYPE(bk->type) == B_DUPLICATE) {
                        pgno = GET_BOVERFLOW(dbp, h, indx)->pgno;
                        if ((ret = __db_31_offdup(dbp, real_name, fhp,
                            LF_ISSET(DB_DUPSORT) ? 1 : 0, &pgno)) != 0)
                                break;
                        if (pgno != GET_BOVERFLOW(dbp, h, indx)->pgno) {
                                *dirtyp = 1;
                                GET_BOVERFLOW(dbp, h, indx)->pgno = pgno;
                        }
                }
        }

        return (ret);
}

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