bt_rec.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: bt_rec.c,v 12.11 2005/10/20 18:57:01 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_shash.h"
#include "dbinc/btree.h"
#include "dbinc/lock.h"
#include "dbinc/log.h"
#include "dbinc/mp.h"

#define IS_BTREE_PAGE(pagep)                                            \
        (TYPE(pagep) == P_IBTREE ||                                     \
         TYPE(pagep) == P_LBTREE || TYPE(pagep) == P_LDUP)

/*
 * __bam_split_recover --
 *      Recovery function for split.
 *
 * PUBLIC: int __bam_split_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__bam_split_recover(dbenv, dbtp, lsnp, op, info)
        DB_ENV *dbenv;
        DBT *dbtp;
        DB_LSN *lsnp;
        db_recops op;
        void *info;
{
        __bam_split_args *argp;
        DB *file_dbp;
        DBC *dbc;
        DB_MPOOLFILE *mpf;
        PAGE *_lp, *lp, *np, *pp, *_rp, *rp, *sp;
        db_pgno_t pgno, root_pgno;
        u_int32_t ptype;
        int cmp, l_update, p_update, r_update, rc, ret, rootsplit, t_ret;

        COMPQUIET(info, NULL);
        REC_PRINT(__bam_split_print);

        mpf = NULL;
        _lp = lp = np = pp = _rp = rp = NULL;
        sp = NULL;

        REC_INTRO(__bam_split_read, 1, 0);

        /*
         * There are two kinds of splits that we have to recover from.  The
         * first is a root-page split, where the root page is split from a
         * leaf page into an internal page and two new leaf pages are created.
         * The second is where a page is split into two pages, and a new key
         * is inserted into the parent page.
         *
         * DBTs are not aligned in log records, so we need to copy the page
         * so that we can access fields within it throughout this routine.
         * Although we could hardcode the unaligned copies in this routine,
         * we will be calling into regular btree functions with this page,
         * so it's got to be aligned.  Copying it into allocated memory is
         * the only way to guarantee this.
         */
        if ((ret = __os_malloc(dbenv, argp->pg.size, &sp)) != 0)
                goto out;
        memcpy(sp, argp->pg.data, argp->pg.size);

        pgno = PGNO(sp);
        root_pgno = argp->root_pgno;
        rootsplit = root_pgno != PGNO_INVALID;
        REC_FGET(mpf, argp->left, &lp, right);
right:  REC_FGET(mpf, argp->right, &rp, redo);

redo:   if (DB_REDO(op)) {
                l_update = r_update = p_update = 0;
                /*
                 * Decide if we need to resplit the page.
                 *
                 * If this is a root split, then the root has to exist unless
                 * we have truncated it due to a future deallocation.
                 */
                if (rootsplit) {
                        REC_FGET(mpf, root_pgno, &pp, do_left);
                        cmp =
                            log_compare(&LSN(pp), &LSN(argp->pg.data));
                        CHECK_LSN(dbenv, op,
                            cmp, &LSN(pp), &LSN(argp->pg.data));
                        p_update = cmp  == 0;
                }

do_left:        if (lp != NULL) {
                        cmp = log_compare(&LSN(lp), &argp->llsn);
                        CHECK_LSN(dbenv, op, cmp, &LSN(lp), &argp->llsn);
                        if (cmp == 0)
                                l_update = 1;
                }

                if (rp != NULL) {
                        cmp = log_compare(&LSN(rp), &argp->rlsn);
                        CHECK_LSN(dbenv, op, cmp, &LSN(rp), &argp->rlsn);
                        if (cmp == 0)
                                r_update = 1;
                }

                if (!p_update && !l_update && !r_update)
                        goto check_next;

                /* Allocate and initialize new left/right child pages. */
                if ((ret = __os_malloc(dbenv, file_dbp->pgsize, &_lp)) != 0 ||
                    (ret = __os_malloc(dbenv, file_dbp->pgsize, &_rp)) != 0)
                        goto out;
                if (rootsplit) {
                        P_INIT(_lp, file_dbp->pgsize, argp->left,
                            PGNO_INVALID,
                            ISINTERNAL(sp) ? PGNO_INVALID : argp->right,
                            LEVEL(sp), TYPE(sp));
                        P_INIT(_rp, file_dbp->pgsize, argp->right,
                            ISINTERNAL(sp) ?  PGNO_INVALID : argp->left,
                            PGNO_INVALID, LEVEL(sp), TYPE(sp));
                } else {
                        P_INIT(_lp, file_dbp->pgsize, PGNO(sp),
                            ISINTERNAL(sp) ? PGNO_INVALID : PREV_PGNO(sp),
                            ISINTERNAL(sp) ? PGNO_INVALID : argp->right,
                            LEVEL(sp), TYPE(sp));
                        P_INIT(_rp, file_dbp->pgsize, argp->right,
                            ISINTERNAL(sp) ? PGNO_INVALID : sp->pgno,
                            ISINTERNAL(sp) ? PGNO_INVALID : NEXT_PGNO(sp),
                            LEVEL(sp), TYPE(sp));
                }

                /* Split the page. */
                if ((ret = __bam_copy(file_dbp, sp, _lp, 0, argp->indx)) != 0 ||
                    (ret = __bam_copy(file_dbp, sp, _rp, argp->indx,
                    NUM_ENT(sp))) != 0)
                        goto out;

                if (l_update) {
                        memcpy(lp, _lp, file_dbp->pgsize);
                        lp->lsn = *lsnp;
                        if ((ret = __memp_fput(mpf, lp, DB_MPOOL_DIRTY)) != 0)
                                goto out;
                        lp = NULL;
                }

                if (r_update) {
                        memcpy(rp, _rp, file_dbp->pgsize);
                        rp->lsn = *lsnp;
                        if ((ret = __memp_fput(mpf, rp, DB_MPOOL_DIRTY)) != 0)
                                goto out;
                        rp = NULL;
                }

                /*
                 * If the parent page is wrong, update it.  This is of interest
                 * only if it was a root split, since root splits create parent
                 * pages.  All other splits modify a parent page, but those are
                 * separately logged and recovered.
                 */
                if (rootsplit && p_update) {
                        if (IS_BTREE_PAGE(sp)) {
                                ptype = P_IBTREE;
                                rc = argp->opflags & SPL_NRECS ? 1 : 0;
                        } else {
                                ptype = P_IRECNO;
                                rc = 1;
                        }

                        P_INIT(pp, file_dbp->pgsize, root_pgno,
                            PGNO_INVALID, PGNO_INVALID, _lp->level + 1, ptype);
                        RE_NREC_SET(pp, rc ? __bam_total(file_dbp, _lp) +
                            __bam_total(file_dbp, _rp) : 0);

                        pp->lsn = *lsnp;
                        if ((ret = __memp_fput(mpf, pp, DB_MPOOL_DIRTY)) != 0)
                                goto out;
                        pp = NULL;
                }

check_next:     /*
                 * Finally, redo the next-page link if necessary.  This is of
                 * interest only if it wasn't a root split -- inserting a new
                 * page in the tree requires that any following page have its
                 * previous-page pointer updated to our new page.  The next
                 * page must exist because we're redoing the operation.
                 */
                if (!rootsplit && argp->npgno != PGNO_INVALID) {
                        if ((ret =
                            __memp_fget(mpf, &argp->npgno, 0, &np)) != 0) {
                                if (ret != DB_PAGE_NOTFOUND
#ifndef HAVE_FTRUNCATE
                                    || DB_REDO(op)
#endif
                                    ) {
                                        ret = __db_pgerr(
                                            file_dbp, argp->npgno, ret);
                                        goto out;
                                } else
                                        goto done;
                        }
                        cmp = log_compare(&LSN(np), &argp->nlsn);
                        CHECK_LSN(dbenv, op, cmp, &LSN(np), &argp->nlsn);
                        if (cmp == 0) {
                                PREV_PGNO(np) = argp->right;
                                np->lsn = *lsnp;
                                if ((ret =
                                    __memp_fput(mpf, np, DB_MPOOL_DIRTY)) != 0)
                                        goto out;
                                np = NULL;
                        }
                }
        } else {
                /*
                 * If the split page is wrong, replace its contents with the
                 * logged page contents.  If the page doesn't exist, it means
                 * that the create of the page never happened, nor did any of
                 * the adds onto the page that caused the split, and there's
                 * really no undo-ing to be done.
                 */
                if ((ret = __memp_fget(mpf, &pgno, 0, &pp)) != 0) {
                        pp = NULL;
                        goto lrundo;
                }
                if (log_compare(lsnp, &LSN(pp)) == 0) {
                        memcpy(pp, argp->pg.data, argp->pg.size);
                        if ((ret = __memp_fput(mpf, pp, DB_MPOOL_DIRTY)) != 0)
                                goto out;
                        pp = NULL;
                }

                /*
                 * If it's a root split and the left child ever existed, update
                 * its LSN.  (If it's not a root split, we've updated the left
                 * page already -- it's the same as the split page.) If the
                 * right child ever existed, root split or not, update its LSN.
                 * The undo of the page allocation(s) will restore them to the
                 * free list.
                 */
lrundo:         if ((rootsplit && lp != NULL) || rp != NULL) {
                        if (rootsplit && lp != NULL &&
                            log_compare(lsnp, &LSN(lp)) == 0) {
                                lp->lsn = argp->llsn;
                                if ((ret =
                                    __memp_fput(mpf, lp, DB_MPOOL_DIRTY)) != 0)
                                        goto out;
                                lp = NULL;
                        }
                        if (rp != NULL &&
                            log_compare(lsnp, &LSN(rp)) == 0) {
                                rp->lsn = argp->rlsn;
                                if ((ret =
                                    __memp_fput(mpf, rp, DB_MPOOL_DIRTY)) != 0)
                                        goto out;
                                rp = NULL;
                        }
                }

                /*
                 * Finally, undo the next-page link if necessary.  This is of
                 * interest only if it wasn't a root split -- inserting a new
                 * page in the tree requires that any following page have its
                 * previous-page pointer updated to our new page.  Since it's
                 * possible that the next-page never existed, we ignore it as
                 * if there's nothing to undo.
                 */
                if (!rootsplit && argp->npgno != PGNO_INVALID) {
                        if ((ret =
                            __memp_fget(mpf, &argp->npgno, 0, &np)) != 0) {
                                np = NULL;
                                goto done;
                        }
                        if (log_compare(lsnp, &LSN(np)) == 0) {
                                PREV_PGNO(np) = argp->left;
                                np->lsn = argp->nlsn;
                                if (__memp_fput(mpf, np, DB_MPOOL_DIRTY))
                                        goto out;
                                np = NULL;
                        }
                }
        }

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

out:    /* Free any pages that weren't dirtied. */
        if (pp != NULL && (t_ret = __memp_fput(mpf, pp, 0)) != 0 && ret == 0)
                ret = t_ret;
        if (lp != NULL && (t_ret = __memp_fput(mpf, lp, 0)) != 0 && ret == 0)
                ret = t_ret;
        if (np != NULL && (t_ret = __memp_fput(mpf, np, 0)) != 0 && ret == 0)
                ret = t_ret;
        if (rp != NULL && (t_ret = __memp_fput(mpf, rp, 0)) != 0 && ret == 0)
                ret = t_ret;

        /* Free any allocated space. */
        if (_lp != NULL)
                __os_free(dbenv, _lp);
        if (_rp != NULL)
                __os_free(dbenv, _rp);
        if (sp != NULL)
                __os_free(dbenv, sp);

        REC_CLOSE;
}

/*
 * __bam_rsplit_recover --
 *      Recovery function for a reverse split.
 *
 * PUBLIC: int __bam_rsplit_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__bam_rsplit_recover(dbenv, dbtp, lsnp, op, info)
        DB_ENV *dbenv;
        DBT *dbtp;
        DB_LSN *lsnp;
        db_recops op;
        void *info;
{
        __bam_rsplit_args *argp;
        DB *file_dbp;
        DBC *dbc;
        DB_LSN copy_lsn;
        DB_MPOOLFILE *mpf;
        PAGE *pagep;
        db_pgno_t pgno, root_pgno;
        db_recno_t rcnt;
        int cmp_n, cmp_p, modified, ret;

        pagep = NULL;
        COMPQUIET(info, NULL);
        REC_PRINT(__bam_rsplit_print);
        REC_INTRO(__bam_rsplit_read, 1, 1);

        /* Fix the root page. */
        pgno = root_pgno = argp->root_pgno;
        if ((ret = __memp_fget(mpf, &pgno, 0, &pagep)) != 0) {
                if (ret != DB_PAGE_NOTFOUND
#ifndef HAVE_FTRUNCATE
                     || DB_REDO(op)
#endif
                     ) {
                        ret = __db_pgerr(file_dbp, pgno, ret);
                        goto out;
                } else
                        goto do_page;
        }

        modified = 0;
        cmp_n = log_compare(lsnp, &LSN(pagep));
        cmp_p = log_compare(&LSN(pagep), &argp->rootlsn);
        CHECK_LSN(dbenv, op, cmp_p, &LSN(pagep), &argp->rootlsn);
        if (cmp_p == 0 && DB_REDO(op)) {
                /*
                 * Copy the new data to the root page.  If it is not now a
                 * leaf page we need to restore the record number.  We could
                 * try to determine if C_RECNUM was set in the btree, but
                 * that's not really necessary since the field is not used
                 * otherwise.
                 */
                rcnt = RE_NREC(pagep);
                memcpy(pagep, argp->pgdbt.data, argp->pgdbt.size);
                if (LEVEL(pagep) > LEAFLEVEL)
                        RE_NREC_SET(pagep, rcnt);
                pagep->pgno = root_pgno;
                pagep->lsn = *lsnp;
                modified = 1;
        } else if (cmp_n == 0 && DB_UNDO(op)) {
                /* Need to undo update described. */
                P_INIT(pagep, file_dbp->pgsize, root_pgno,
                    argp->nrec, PGNO_INVALID, pagep->level + 1,
                    IS_BTREE_PAGE(pagep) ? P_IBTREE : P_IRECNO);
                if ((ret = __db_pitem(dbc, pagep, 0,
                    argp->rootent.size, &argp->rootent, NULL)) != 0)
                        goto out;
                pagep->lsn = argp->rootlsn;
                modified = 1;
        }
        if ((ret = __memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
                goto out;

do_page:
        /*
         * Fix the page copied over the root page.  It's possible that the
         * page never made it to disk, so if we're undo-ing and the page
         * doesn't exist, it's okay and there's nothing further to do.
         */
        if ((ret = __memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
                if (ret != DB_PAGE_NOTFOUND
#ifndef HAVE_FTRUNCATE
                     || DB_REDO(op)
#endif
                     ) {
                        ret = __db_pgerr(file_dbp, argp->pgno, ret);
                        goto out;
                } else
                        goto done;
        }
        modified = 0;
        (void)__ua_memcpy(&copy_lsn, &LSN(argp->pgdbt.data), sizeof(DB_LSN));
        cmp_n = log_compare(lsnp, &LSN(pagep));
        cmp_p = log_compare(&LSN(pagep), &copy_lsn);
        CHECK_LSN(dbenv, op, cmp_p, &LSN(pagep), &copy_lsn);
        if (cmp_p == 0 && DB_REDO(op)) {
                /* Need to redo update described. */
                pagep->lsn = *lsnp;
                modified = 1;
        } else if (cmp_n == 0 && DB_UNDO(op)) {
                /* Need to undo update described. */
                memcpy(pagep, argp->pgdbt.data, argp->pgdbt.size);
                modified = 1;
        }
        if ((ret = __memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
                goto out;
        pagep = NULL;

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

out:    if (pagep != NULL)
                (void)__memp_fput(mpf, pagep, 0);
        REC_CLOSE;
}

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

        pagep = NULL;
        COMPQUIET(info, NULL);
        REC_PRINT(__bam_adj_print);
        REC_INTRO(__bam_adj_read, 1, 1);

        /* Get the page; if it never existed and we're undoing, we're done. */
        if ((ret = __memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
                if (ret != DB_PAGE_NOTFOUND
#ifndef HAVE_FTRUNCATE
                     || DB_REDO(op)
#endif
                     ) {
                        ret = __db_pgerr(file_dbp, argp->pgno, ret);
                        goto out;
                } else
                        goto done;
        }

        modified = 0;
        cmp_n = log_compare(lsnp, &LSN(pagep));
        cmp_p = log_compare(&LSN(pagep), &argp->lsn);
        CHECK_LSN(dbenv, op, cmp_p, &LSN(pagep), &argp->lsn);
        if (cmp_p == 0 && DB_REDO(op)) {
                /* Need to redo update described. */
                if ((ret = __bam_adjindx(dbc,
                    pagep, argp->indx, argp->indx_copy, argp->is_insert)) != 0)
                        goto out;

                LSN(pagep) = *lsnp;
                modified = 1;
        } else if (cmp_n == 0 && DB_UNDO(op)) {
                /* Need to undo update described. */
                if ((ret = __bam_adjindx(dbc,
                    pagep, argp->indx, argp->indx_copy, !argp->is_insert)) != 0)
                        goto out;

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

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

out:    if (pagep != NULL)
                (void)__memp_fput(mpf, pagep, 0);
        REC_CLOSE;
}

/*
 * __bam_cadjust_recover --
 *      Recovery function for the adjust of a count change in an internal
 *      page.
 *
 * PUBLIC: int __bam_cadjust_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__bam_cadjust_recover(dbenv, dbtp, lsnp, op, info)
        DB_ENV *dbenv;
        DBT *dbtp;
        DB_LSN *lsnp;
        db_recops op;
        void *info;
{
        __bam_cadjust_args *argp;
        DB *file_dbp;
        DBC *dbc;
        DB_MPOOLFILE *mpf;
        PAGE *pagep;
        int cmp_n, cmp_p, modified, ret;

        pagep = NULL;
        COMPQUIET(info, NULL);
        REC_PRINT(__bam_cadjust_print);
        REC_INTRO(__bam_cadjust_read, 1, 0);

        /* Get the page; if it never existed and we're undoing, we're done. */
        if ((ret = __memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
                if (ret != DB_PAGE_NOTFOUND
#ifndef HAVE_FTRUNCATE
                     || DB_REDO(op)
#endif
                     ) {
                        ret = __db_pgerr(file_dbp, argp->pgno, ret);
                        goto out;
                } else
                        goto done;
        }

        modified = 0;
        cmp_n = log_compare(lsnp, &LSN(pagep));
        cmp_p = log_compare(&LSN(pagep), &argp->lsn);
        CHECK_LSN(dbenv, op, cmp_p, &LSN(pagep), &argp->lsn);
        if (cmp_p == 0 && DB_REDO(op)) {
                /* Need to redo update described. */
                if (IS_BTREE_PAGE(pagep)) {
                        GET_BINTERNAL(file_dbp, pagep, argp->indx)->nrecs +=
                            argp->adjust;
                        if (argp->opflags & CAD_UPDATEROOT)
                                RE_NREC_ADJ(pagep, argp->adjust);
                } else {
                        GET_RINTERNAL(file_dbp, pagep, argp->indx)->nrecs +=
                            argp->adjust;
                        if (argp->opflags & CAD_UPDATEROOT)
                                RE_NREC_ADJ(pagep, argp->adjust);
                }

                LSN(pagep) = *lsnp;
                modified = 1;
        } else if (cmp_n == 0 && DB_UNDO(op)) {
                /* Need to undo update described. */
                if (IS_BTREE_PAGE(pagep)) {
                        GET_BINTERNAL(file_dbp, pagep, argp->indx)->nrecs -=
                            argp->adjust;
                        if (argp->opflags & CAD_UPDATEROOT)
                                RE_NREC_ADJ(pagep, -(argp->adjust));
                } else {
                        GET_RINTERNAL(file_dbp, pagep, argp->indx)->nrecs -=
                            argp->adjust;
                        if (argp->opflags & CAD_UPDATEROOT)
                                RE_NREC_ADJ(pagep, -(argp->adjust));
                }
                LSN(pagep) = argp->lsn;
                modified = 1;
        }
        if ((ret = __memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
                goto out;
        pagep = NULL;

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

out:    if (pagep != NULL)
                (void)__memp_fput(mpf, pagep, 0);
        REC_CLOSE;
}

/*
 * __bam_cdel_recover --
 *      Recovery function for the intent-to-delete of a cursor record.
 *
 * PUBLIC: int __bam_cdel_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__bam_cdel_recover(dbenv, dbtp, lsnp, op, info)
        DB_ENV *dbenv;
        DBT *dbtp;
        DB_LSN *lsnp;
        db_recops op;
        void *info;
{
        __bam_cdel_args *argp;
        DB *file_dbp;
        DBC *dbc;
        DB_MPOOLFILE *mpf;
        PAGE *pagep;
        u_int32_t indx;
        int cmp_n, cmp_p, modified, ret;

        pagep = NULL;
        COMPQUIET(info, NULL);
        REC_PRINT(__bam_cdel_print);
        REC_INTRO(__bam_cdel_read, 1, 0);

        /* Get the page; if it never existed and we're undoing, we're done. */
        if ((ret = __memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
                if (ret != DB_PAGE_NOTFOUND
#ifndef HAVE_FTRUNCATE
                     || DB_REDO(op)
#endif
                     ) {
                        ret = __db_pgerr(file_dbp, argp->pgno, ret);
                        goto out;
                } else
                        goto done;
        }

        modified = 0;
        cmp_n = log_compare(lsnp, &LSN(pagep));
        cmp_p = log_compare(&LSN(pagep), &argp->lsn);
        CHECK_LSN(dbenv, op, cmp_p, &LSN(pagep), &argp->lsn);
        if (cmp_p == 0 && DB_REDO(op)) {
                /* Need to redo update described. */
                indx = argp->indx + (TYPE(pagep) == P_LBTREE ? O_INDX : 0);
                B_DSET(GET_BKEYDATA(file_dbp, pagep, indx)->type);

                LSN(pagep) = *lsnp;
                modified = 1;
        } else if (cmp_n == 0 && DB_UNDO(op)) {
                /* Need to undo update described. */
                indx = argp->indx + (TYPE(pagep) == P_LBTREE ? O_INDX : 0);
                B_DCLR(GET_BKEYDATA(file_dbp, pagep, indx)->type);

                if ((ret = __bam_ca_delete(
                    file_dbp, argp->pgno, argp->indx, 0, NULL)) != 0)
                        goto out;

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

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

out:    if (pagep != NULL)
                (void)__memp_fput(mpf, pagep, 0);
        REC_CLOSE;
}

/*
 * __bam_repl_recover --
 *      Recovery function for page item replacement.
 *
 * PUBLIC: int __bam_repl_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__bam_repl_recover(dbenv, dbtp, lsnp, op, info)
        DB_ENV *dbenv;
        DBT *dbtp;
        DB_LSN *lsnp;
        db_recops op;
        void *info;
{
        __bam_repl_args *argp;
        BKEYDATA *bk;
        DB *file_dbp;
        DBC *dbc;
        DBT dbt;
        DB_MPOOLFILE *mpf;
        PAGE *pagep;
        int cmp_n, cmp_p, modified, ret;
        u_int8_t *p;

        pagep = NULL;
        COMPQUIET(info, NULL);
        REC_PRINT(__bam_repl_print);
        REC_INTRO(__bam_repl_read, 1, 1);

        /* Get the page; if it never existed and we're undoing, we're done. */
        if ((ret = __memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
                if (ret != DB_PAGE_NOTFOUND
#ifndef HAVE_FTRUNCATE
                     || DB_REDO(op)
#endif
                     ) {
                        ret = __db_pgerr(file_dbp, argp->pgno, ret);
                        goto out;
                } else
                        goto done;
        }
        bk = GET_BKEYDATA(file_dbp, pagep, argp->indx);

        modified = 0;
        cmp_n = log_compare(lsnp, &LSN(pagep));
        cmp_p = log_compare(&LSN(pagep), &argp->lsn);
        CHECK_LSN(dbenv, op, cmp_p, &LSN(pagep), &argp->lsn);
        if (cmp_p == 0 && DB_REDO(op)) {
                /*
                 * Need to redo update described.
                 *
                 * Re-build the replacement item.
                 */
                memset(&dbt, 0, sizeof(dbt));
                dbt.size = argp->prefix + argp->suffix + argp->repl.size;
                if ((ret = __os_malloc(dbenv, dbt.size, &dbt.data)) != 0)
                        goto out;
                p = dbt.data;
                memcpy(p, bk->data, argp->prefix);
                p += argp->prefix;
                memcpy(p, argp->repl.data, argp->repl.size);
                p += argp->repl.size;
                memcpy(p, bk->data + (bk->len - argp->suffix), argp->suffix);

                ret = __bam_ritem(dbc, pagep, argp->indx, &dbt);
                __os_free(dbenv, dbt.data);
                if (ret != 0)
                        goto out;

                LSN(pagep) = *lsnp;
                modified = 1;
        } else if (cmp_n == 0 && DB_UNDO(op)) {
                /*
                 * Need to undo update described.
                 *
                 * Re-build the original item.
                 */
                memset(&dbt, 0, sizeof(dbt));
                dbt.size = argp->prefix + argp->suffix + argp->orig.size;
                if ((ret = __os_malloc(dbenv, dbt.size, &dbt.data)) != 0)
                        goto out;
                p = dbt.data;
                memcpy(p, bk->data, argp->prefix);
                p += argp->prefix;
                memcpy(p, argp->orig.data, argp->orig.size);
                p += argp->orig.size;
                memcpy(p, bk->data + (bk->len - argp->suffix), argp->suffix);

                ret = __bam_ritem(dbc, pagep, argp->indx, &dbt);
                __os_free(dbenv, dbt.data);
                if (ret != 0)
                        goto out;

                /* Reset the deleted flag, if necessary. */
                if (argp->isdeleted)
                        B_DSET(GET_BKEYDATA(file_dbp, pagep, argp->indx)->type);

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

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

out:    if (pagep != NULL)
                (void)__memp_fput(mpf, pagep, 0);
        REC_CLOSE;
}

/*
 * __bam_root_recover --
 *      Recovery function for setting the root page on the meta-data page.
 *
 * PUBLIC: int __bam_root_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__bam_root_recover(dbenv, dbtp, lsnp, op, info)
        DB_ENV *dbenv;
        DBT *dbtp;
        DB_LSN *lsnp;
        db_recops op;
        void *info;
{
        __bam_root_args *argp;
        BTMETA *meta;
        DB *file_dbp;
        DBC *dbc;
        DB_MPOOLFILE *mpf;
        int cmp_n, cmp_p, modified, ret;

        meta = NULL;
        COMPQUIET(info, NULL);
        REC_PRINT(__bam_root_print);
        REC_INTRO(__bam_root_read, 0, 0);

        if ((ret = __memp_fget(mpf, &argp->meta_pgno, 0, &meta)) != 0) {
                if (ret != DB_PAGE_NOTFOUND
#ifndef HAVE_FTRUNCATE
                     || DB_REDO(op)
#endif
                     ) {
                        ret = __db_pgerr(file_dbp, argp->meta_pgno, ret);
                        goto out;
                } else
                        goto done;
        }

        modified = 0;
        cmp_n = log_compare(lsnp, &LSN(meta));
        cmp_p = log_compare(&LSN(meta), &argp->meta_lsn);
        CHECK_LSN(dbenv, op, cmp_p, &LSN(meta), &argp->meta_lsn);
        if (cmp_p == 0 && DB_REDO(op)) {
                /* Need to redo update described. */
                meta->root = argp->root_pgno;
                meta->dbmeta.lsn = *lsnp;
                ((BTREE *)file_dbp->bt_internal)->bt_root = meta->root;
                modified = 1;
        } else if (cmp_n == 0 && DB_UNDO(op)) {
                /* Nothing to undo except lsn. */
                meta->dbmeta.lsn = argp->meta_lsn;
                modified = 1;
        }
        if ((ret = __memp_fput(mpf, meta, modified ? DB_MPOOL_DIRTY : 0)) != 0)
                goto out;
        meta = NULL;

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

out:    if (meta != NULL)
                (void)__memp_fput(mpf, meta, 0);
        REC_CLOSE;
}

/*
 * __bam_curadj_recover --
 *      Transaction abort function to undo cursor adjustments.
 *      This should only be triggered by subtransaction aborts.
 *
 * PUBLIC: int __bam_curadj_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__bam_curadj_recover(dbenv, dbtp, lsnp, op, info)
        DB_ENV *dbenv;
        DBT *dbtp;
        DB_LSN *lsnp;
        db_recops op;
        void *info;
{
        __bam_curadj_args *argp;
        DB *file_dbp;
        DBC *dbc;
        DB_MPOOLFILE *mpf;
        int ret;

        COMPQUIET(info, NULL);
        COMPQUIET(mpf, NULL);

        REC_PRINT(__bam_curadj_print);
        REC_INTRO(__bam_curadj_read, 0, 1);

        ret = 0;
        if (op != DB_TXN_ABORT)
                goto done;

        switch (argp->mode) {
        case DB_CA_DI:
                if ((ret = __bam_ca_di(dbc, argp->from_pgno,
                    argp->from_indx, -(int)argp->first_indx)) != 0)
                        goto out;
                break;
        case DB_CA_DUP:
                if ((ret = __bam_ca_undodup(file_dbp, argp->first_indx,
                    argp->from_pgno, argp->from_indx, argp->to_indx)) != 0)
                        goto out;
                break;

        case DB_CA_RSPLIT:
                if ((ret =
                    __bam_ca_rsplit(dbc, argp->to_pgno, argp->from_pgno)) != 0)
                        goto out;
                break;

        case DB_CA_SPLIT:
                if ((ret = __bam_ca_undosplit(file_dbp, argp->from_pgno,
                    argp->to_pgno, argp->left_pgno, argp->from_indx)) != 0)
                        goto out;
                break;
        }

done:   *lsnp = argp->prev_lsn;
out:    REC_CLOSE;
}

/*
 * __bam_rcuradj_recover --
 *      Transaction abort function to undo cursor adjustments in rrecno.
 *      This should only be triggered by subtransaction aborts.
 *
 * PUBLIC: int __bam_rcuradj_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__bam_rcuradj_recover(dbenv, dbtp, lsnp, op, info)
        DB_ENV *dbenv;
        DBT *dbtp;
        DB_LSN *lsnp;
        db_recops op;
        void *info;
{
        __bam_rcuradj_args *argp;
        BTREE_CURSOR *cp;
        DB *file_dbp;
        DBC *dbc, *rdbc;
        DB_MPOOLFILE *mpf;
        int ret, t_ret;

        COMPQUIET(info, NULL);
        COMPQUIET(mpf, NULL);
        rdbc = NULL;

        REC_PRINT(__bam_rcuradj_print);
        REC_INTRO(__bam_rcuradj_read, 0, 1);

        ret = t_ret = 0;

        if (op != DB_TXN_ABORT)
                goto done;

        /*
         * We don't know whether we're in an offpage dup set, and
         * thus don't know whether the dbc REC_INTRO has handed us is
         * of a reasonable type.  It's certainly unset, so if this is
         * an offpage dup set, we don't have an OPD cursor.  The
         * simplest solution is just to allocate a whole new cursor
         * for our use;  we're only really using it to hold pass some
         * state into __ram_ca, and this way we don't need to make
         * this function know anything about how offpage dups work.
         */
        if ((ret = __db_cursor_int(file_dbp,
                NULL, DB_RECNO, argp->root, 0, DB_LOCK_INVALIDID, &rdbc)) != 0)
                goto out;

        cp = (BTREE_CURSOR *)rdbc->internal;
        F_SET(cp, C_RENUMBER);
        cp->recno = argp->recno;

        switch (argp->mode) {
        case CA_DELETE:
                /*
                 * The way to undo a delete is with an insert.  Since
                 * we're undoing it, the delete flag must be set.
                 */
                F_SET(cp, C_DELETED);
                F_SET(cp, C_RENUMBER);  /* Just in case. */
                cp->order = argp->order;
                (void)__ram_ca(rdbc, CA_ICURRENT);
                break;
        case CA_IAFTER:
        case CA_IBEFORE:
        case CA_ICURRENT:
                /*
                 * The way to undo an insert is with a delete.  The delete
                 * flag is unset to start with.
                 */
                F_CLR(cp, C_DELETED);
                cp->order = INVALID_ORDER;
                (void)__ram_ca(rdbc, CA_DELETE);
                break;
        }

done:   *lsnp = argp->prev_lsn;
out:    if (rdbc != NULL && (t_ret = __db_c_close(rdbc)) != 0 && ret == 0)
                ret = t_ret;
        REC_CLOSE;
}

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

        pagep = NULL;
        COMPQUIET(info, NULL);
        REC_PRINT(__bam_relink_print);
        REC_INTRO(__bam_relink_read, 1, 0);

        /*
         * 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.
         */
        if ((ret = __memp_fget(mpf, &argp->next, 0, &pagep)) != 0) {
                if (ret != DB_PAGE_NOTFOUND
#ifndef HAVE_FTRUNCATE
                     || DB_REDO(op)
#endif
                     ) {
                        ret = __db_pgerr(file_dbp, argp->next, ret);
                        goto out;
                } else
                        goto prev;
        }

        modified = 0;
        cmp_n = log_compare(lsnp, &LSN(pagep));
        cmp_p = log_compare(&LSN(pagep), &argp->lsn_next);
        CHECK_LSN(dbenv, op, cmp_p, &LSN(pagep), &argp->lsn_next);
        if (cmp_p == 0 && DB_REDO(op)) {
                /* Redo the remove or replace. */
                if (argp->new_pgno == PGNO_INVALID)
                        pagep->prev_pgno = argp->prev;
                else
                        pagep->prev_pgno = argp->new_pgno;

                pagep->lsn = *lsnp;
                modified = 1;
        } else if (cmp_n == 0 && DB_UNDO(op)) {
                /* Undo the remove or replace. */
                pagep->prev_pgno = argp->pgno;

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

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

prev: if ((ret = __memp_fget(mpf, &argp->prev, 0, &pagep)) != 0) {
                if (ret != DB_PAGE_NOTFOUND
#ifndef HAVE_FTRUNCATE
                     || DB_REDO(op)
#endif
                     ) {
                        ret = __db_pgerr(file_dbp, argp->prev, ret);
                        goto out;
                } else
                        goto done;
        }

        modified = 0;
        cmp_p = log_compare(&LSN(pagep), &argp->lsn_prev);
        CHECK_LSN(dbenv, op, cmp_p, &LSN(pagep), &argp->lsn_prev);
        if (cmp_p == 0 && DB_REDO(op)) {
                /* Redo the relink. */
                if (argp->new_pgno == PGNO_INVALID)
                        pagep->next_pgno = argp->next;
                else
                        pagep->next_pgno = argp->new_pgno;

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

                modified = 1;
        }

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

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

out:    if (pagep != NULL)
                (void)__memp_fput(mpf, pagep, 0);
        REC_CLOSE;
}

/*
 * __bam_merge_recover --
 *      Recovery function for merge.
 *
 * PUBLIC: int __bam_merge_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__bam_merge_recover(dbenv, dbtp, lsnp, op, info)
        DB_ENV *dbenv;
        DBT *dbtp;
        DB_LSN *lsnp;
        db_recops op;
        void *info;
{
        __bam_merge_args *argp;
        BKEYDATA *bk;
        DB *file_dbp;
        DBC *dbc;
        DB_MPOOLFILE *mpf;
        PAGE *pagep;
        db_indx_t indx, *ninp, *pinp;
        u_int32_t size;
        u_int8_t *bp;
        int cmp_n, cmp_p, i, modified, ret;

        COMPQUIET(info, NULL);

        REC_PRINT(__bam_merge_print);
        REC_INTRO(__bam_merge_read, 1, 1);

        if ((ret = __memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
                if (ret != DB_PAGE_NOTFOUND
#ifndef HAVE_FTRUNCATE
                     || DB_REDO(op)
#endif
                     ) {
                        ret = __db_pgerr(file_dbp, argp->pgno, ret);
                        goto out;
                } else
                        goto next;
        }

        modified = 0;
        cmp_n = log_compare(lsnp, &LSN(pagep));
        cmp_p = log_compare(&LSN(pagep), &argp->lsn);
        CHECK_LSN(file_dbp->dbenv, op, cmp_p, &LSN(pagep), &argp->lsn);

        if (cmp_p == 0 && DB_REDO(op)) {
                /*
                 * If the header is provided the page is empty, copy the
                 * needed data.
                 */
                DB_ASSERT(argp->hdr.size == 0 || NUM_ENT(pagep) == 0);
                if (argp->hdr.size != 0) {
                        P_INIT(pagep, file_dbp->pgsize, pagep->pgno,
                             PREV_PGNO(argp->hdr.data),
                             NEXT_PGNO(argp->hdr.data),
                             LEVEL(argp->hdr.data), TYPE(argp->hdr.data));
                }
                if (TYPE(pagep) == P_OVERFLOW) {
                        OV_REF(pagep) = OV_REF(argp->hdr.data);
                        OV_LEN(pagep) = OV_LEN(argp->hdr.data);
                        bp = (u_int8_t *) pagep + P_OVERHEAD(file_dbp);
                        memcpy(bp, argp->data.data, argp->data.size);
                } else {
                        /* Copy the data segment. */
                        bp = (u_int8_t *)pagep +
                             (db_indx_t)(HOFFSET(pagep) - argp->data.size);
                        memcpy(bp, argp->data.data, argp->data.size);

                        /* Copy index table offset past the current entries. */
                        pinp = P_INP(file_dbp, pagep) + NUM_ENT(pagep);
                        ninp = argp->ind.data;
                        for (i = 0;
                             i < (int)(argp->ind.size / sizeof(*ninp)); i++)
                                *pinp++ = *ninp++
                                      - (file_dbp->pgsize - HOFFSET(pagep));
                        HOFFSET(pagep) -= argp->data.size;
                        NUM_ENT(pagep) += i;
                }
                pagep->lsn = *lsnp;
                modified = 1;
        } else if (cmp_n == 0 && !DB_REDO(op)) {
                /*
                 * Since logging is logical at the page level
                 * we cannot just truncate the data space.  Delete
                 * the proper number of items from the logical end
                 * of the page.
                 */
                for (i = 0; i < (int)(argp->ind.size / sizeof(*ninp)); i++) {
                        indx = NUM_ENT(pagep) - 1;
                        if (P_INP(file_dbp, pagep)[indx] ==
                             P_INP(file_dbp, pagep)[indx - P_INDX]) {
                                NUM_ENT(pagep)--;
                                continue;
                        }
                        switch (TYPE(pagep)) {
                        case P_LBTREE:
                        case P_LRECNO:
                        case P_LDUP:
                                bk = GET_BKEYDATA(file_dbp, pagep, indx);
                                size = BITEM_SIZE(bk);
                                break;

                        case P_IBTREE:
                                size = BINTERNAL_SIZE(
                                     GET_BINTERNAL(file_dbp, pagep, indx)->len);
                                break;
                        case P_IRECNO:
                                size = RINTERNAL_SIZE;
                                break;

                        default:
                                ret = __db_pgfmt(dbenv, PGNO(pagep));
                                goto out;
                        }
                        if ((ret =
                             __db_ditem(dbc, pagep, indx, size)) != 0)
                                goto out;
                }
                if (argp->ind.size == 0)
                        HOFFSET(pagep) = file_dbp->pgsize;
                pagep->lsn = argp->lsn;
                modified = 1;
        }

        if ((ret = __memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
                goto out;

next:   if ((ret = __memp_fget(mpf, &argp->npgno, 0, &pagep)) != 0) {
                if (ret != DB_PAGE_NOTFOUND
#ifndef HAVE_FTRUNCATE
                     || DB_REDO(op)
#endif
                     ) {
                        ret = __db_pgerr(file_dbp, argp->pgno, ret);
                        goto out;
                } else
                        goto done;
        }

        modified = 0;
        cmp_n = log_compare(lsnp, &LSN(pagep));
        cmp_p = log_compare(&LSN(pagep), &argp->nlsn);
        CHECK_LSN(file_dbp->dbenv, op, cmp_p, &LSN(pagep), &argp->nlsn);

        if (cmp_p == 0 && DB_REDO(op)) {
                /* Need to truncate the page. */
                HOFFSET(pagep) = file_dbp->pgsize;
                NUM_ENT(pagep) = 0;
                pagep->lsn = *lsnp;
                modified = 1;
        } else if (cmp_n == 0 && !DB_REDO(op)) {
                /* Need to put the data back on the page. */
                if (TYPE(pagep) == P_OVERFLOW) {
                        OV_REF(pagep) = OV_REF(argp->hdr.data);
                        OV_LEN(pagep) = OV_LEN(argp->hdr.data);
                        bp = (u_int8_t *) pagep + P_OVERHEAD(file_dbp);
                        memcpy(bp, argp->data.data, argp->data.size);
                } else {
                        bp = (u_int8_t *)pagep +
                             (db_indx_t)(HOFFSET(pagep) - argp->data.size);
                        memcpy(bp, argp->data.data, argp->data.size);

                        /* Copy index table. */
                        pinp = P_INP(file_dbp, pagep) + NUM_ENT(pagep);
                        ninp = argp->ind.data;
                        for (i = 0;
                            i < (int)(argp->ind.size / sizeof(*ninp)); i++)
                                *pinp++ = *ninp++;
                        HOFFSET(pagep) -= argp->data.size;
                        NUM_ENT(pagep) = i;
                }
                pagep->lsn = argp->nlsn;
                modified = 1;
        }

        if ((ret = __memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
                goto out;
done:
        *lsnp = argp->prev_lsn;
        ret = 0;

out:    REC_CLOSE;
}

/*
 * __bam_pgno_recover --
 *      Recovery function for page number replacment.
 *
 * PUBLIC: int __bam_pgno_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__bam_pgno_recover(dbenv, dbtp, lsnp, op, info)
        DB_ENV *dbenv;
        DBT *dbtp;
        DB_LSN *lsnp;
        db_recops op;
        void *info;
{
        BINTERNAL *bi;
        __bam_pgno_args *argp;
        DB *file_dbp;
        DBC *dbc;
        DB_MPOOLFILE *mpf;
        PAGE *pagep, *npagep;
        db_pgno_t *pgnop;
        int cmp_n, cmp_p, modified, ret;

        COMPQUIET(info, NULL);

        REC_PRINT(__bam_pgno_print);
        REC_INTRO(__bam_pgno_read, 1, 0);

        REC_FGET(mpf, argp->pgno, &pagep, done);

        modified = 0;
        cmp_n = log_compare(lsnp, &LSN(pagep));
        cmp_p = log_compare(&LSN(pagep), &argp->lsn);
        CHECK_LSN(file_dbp->dbenv, op, cmp_p, &LSN(pagep), &argp->lsn);

        if ((cmp_p == 0 && DB_REDO(op)) || (cmp_n == 0 && !DB_REDO(op))) {
                switch (TYPE(pagep)) {
                case P_IBTREE:
                        /*
                         * An internal record can have both a overflow
                         * and child pointer.  Fetch the page to see
                         * which it is.
                         */
                        bi = GET_BINTERNAL(file_dbp, pagep, argp->indx);
                        if (B_TYPE(bi->type) == B_OVERFLOW) {
                                REC_FGET(mpf, argp->npgno, &npagep, out);

                                if (TYPE(npagep) == P_OVERFLOW)
                                        pgnop =
                                             &((BOVERFLOW *)(bi->data))->pgno;
                                else
                                        pgnop = &bi->pgno;
                                if ((ret = __memp_fput(mpf, npagep, 0)) != 0)
                                        goto out;
                                break;
                        }
                        pgnop = &bi->pgno;
                        break;
                case P_IRECNO:
                        pgnop =
                             &GET_RINTERNAL(file_dbp, pagep, argp->indx)->pgno;
                        break;
                default:
                        pgnop =
                             &GET_BOVERFLOW(file_dbp, pagep, argp->indx)->pgno;
                        break;
                }

                if (DB_REDO(op)) {
                        /* Need to redo update described. */
                        *pgnop = argp->npgno;
                        pagep->lsn = *lsnp;
                        modified = 1;
                } else {
                        *pgnop = argp->opgno;
                        pagep->lsn = argp->lsn;
                        modified = 1;
                }
        }

        if ((ret = __memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
                goto out;

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

out:    REC_CLOSE;
}

---