Update after charmap correction.

[glibc/history.git] / db2 / btree / bt_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[] = "@(#)bt_rec.c      10.21 (Sleepycat) 4/28/98";
#endif /* not lint */

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

#include <errno.h>
#include <string.h>
#endif

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

/*
 * __bam_pg_alloc_recover --
 *      Recovery function for pg_alloc.
 *
 * PUBLIC: int __bam_pg_alloc_recover
 * PUBLIC:   __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
 */
int
__bam_pg_alloc_recover(logp, dbtp, lsnp, redo, info)
        DB_LOG *logp;
        DBT *dbtp;
        DB_LSN *lsnp;
        int redo;
        void *info;
{
        __bam_pg_alloc_args *argp;
        BTMETA *meta;
        DB_MPOOLFILE *mpf;
        PAGE *pagep;
        DB *file_dbp, *mdbp;
        db_pgno_t pgno;
        int cmp_n, cmp_p, modified, ret;

        REC_PRINT(__bam_pg_alloc_print);
        REC_INTRO(__bam_pg_alloc_read);

        /*
         * Fix up the allocated page.  If we're redoing the operation, we have
         * to get the page (creating it if it doesn't exist), and update its
         * LSN.  If we're undoing the operation, we have to reset the page's
         * LSN and put it on the free list.
         *
         * Fix up the metadata page.  If we're redoing the operation, we have
         * to get the metadata page and update its LSN and its free pointer.
         * If we're undoing the operation and the page was ever created, we put
         * it on the freelist.
         */
        pgno = PGNO_METADATA;
        if ((ret = memp_fget(mpf, &pgno, 0, &meta)) != 0) {
                /* The metadata page must always exist. */
                (void)__db_pgerr(file_dbp, pgno);
                goto out;
        }
        if ((ret = memp_fget(mpf, &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0) {
                /*
                 * We specify creation and check for it later, because this
                 * operation was supposed to create the page, and even in
                 * the undo case it's going to get linked onto the freelist
                 * which we're also fixing up.
                 */
                (void)__db_pgerr(file_dbp, argp->pgno);
                (void)memp_fput(mpf, meta, 0);
                goto out;
        }

        /* Fix up the allocated page. */
        modified = 0;
        cmp_n = log_compare(lsnp, &LSN(pagep));
        cmp_p = log_compare(&LSN(pagep), &argp->page_lsn);
        if (cmp_p == 0 && redo) {
                /* Need to redo update described. */
                P_INIT(pagep, file_dbp->pgsize,
                    argp->pgno, PGNO_INVALID, PGNO_INVALID, 0, argp->ptype);

                pagep->lsn = *lsnp;
                modified = 1;
        } else if (cmp_n == 0 && !redo) {
                /* Need to undo update described. */
                P_INIT(pagep, file_dbp->pgsize,
                    argp->pgno, PGNO_INVALID, meta->free, 0, P_INVALID);

                pagep->lsn = argp->page_lsn;
                modified = 1;
        }
        if ((ret = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0) {
                (void)__db_panic(file_dbp);
                (void)memp_fput(mpf, meta, 0);
                goto out;
        }

        /* Fix up the metadata page. */
        modified = 0;
        cmp_n = log_compare(lsnp, &LSN(meta));
        cmp_p = log_compare(&LSN(meta), &argp->meta_lsn);
        if (cmp_p == 0 && redo) {
                /* Need to redo update described. */
                meta->lsn = *lsnp;
                meta->free = argp->next;
                modified = 1;
        } else if (cmp_n == 0 && !redo) {
                /* Need to undo update described. */
                meta->lsn = argp->meta_lsn;
                meta->free = argp->pgno;
                modified = 1;
        }
        if ((ret = memp_fput(mpf, meta, modified ? DB_MPOOL_DIRTY : 0)) != 0) {
                (void)__db_panic(file_dbp);
                goto out;
        }

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

out:    REC_CLOSE;
}

/*
 * __bam_pg_free_recover --
 *      Recovery function for pg_free.
 *
 * PUBLIC: int __bam_pg_free_recover
 * PUBLIC:   __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
 */
int
__bam_pg_free_recover(logp, dbtp, lsnp, redo, info)
        DB_LOG *logp;
        DBT *dbtp;
        DB_LSN *lsnp;
        int redo;
        void *info;
{
        __bam_pg_free_args *argp;
        BTMETA *meta;
        DB *file_dbp, *mdbp;
        DB_MPOOLFILE *mpf;
        PAGE *pagep;
        db_pgno_t pgno;
        int cmp_n, cmp_p, modified, ret;

        REC_PRINT(__bam_pg_free_print);
        REC_INTRO(__bam_pg_free_read);

        /*
         * Fix up the freed page.  If we're redoing the operation we get the
         * page and explicitly discard its contents, then update its LSN.  If
         * we're undoing the operation, we get the page and restore its header.
         */
        if ((ret = memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
                /*
                 * We don't automatically create the page.  The only way the
                 * page might not exist is if the alloc never happened, and
                 * the only way the alloc might never have happened is if we
                 * are undoing, in which case there's no reason to create the
                 * page.
                 */
                if (!redo)
                        goto done;
                (void)__db_pgerr(file_dbp, argp->pgno);
                goto out;
        }
        modified = 0;
        cmp_n = log_compare(lsnp, &LSN(pagep));
        cmp_p = log_compare(&LSN(pagep), &LSN(argp->header.data));
        if (cmp_p == 0 && redo) {
                /* Need to redo update described. */
                P_INIT(pagep, file_dbp->pgsize,
                    pagep->pgno, PGNO_INVALID, argp->next, 0, P_INVALID);
                pagep->lsn = *lsnp;

                modified = 1;
        } else if (cmp_n == 0 && !redo) {
                /* Need to undo update described. */
                memcpy(pagep, argp->header.data, argp->header.size);

                modified = 1;
        }
        if ((ret = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0) {
                (void)__db_panic(file_dbp);
                goto out;
        }

        /*
         * Fix up the metadata page.  If we're redoing or undoing the operation
         * we get the page and update its LSN and free pointer.
         */
        pgno = PGNO_METADATA;
        if ((ret = memp_fget(mpf, &pgno, 0, &meta)) != 0) {
                /* The metadata page must always exist. */
                (void)__db_pgerr(file_dbp, pgno);
                goto out;
        }

        modified = 0;
        cmp_n = log_compare(lsnp, &LSN(meta));
        cmp_p = log_compare(&LSN(meta), &argp->meta_lsn);
        if (cmp_p == 0 && redo) {
                /* Need to redo update described. */
                meta->free = argp->pgno;

                meta->lsn = *lsnp;
                modified = 1;
        } else if (cmp_n == 0 && !redo) {
                /* Need to undo update described. */
                meta->free = argp->next;

                meta->lsn = argp->meta_lsn;
                modified = 1;
        }
        if ((ret = memp_fput(mpf, meta, modified ? DB_MPOOL_DIRTY : 0)) != 0) {
                (void)__db_panic(file_dbp);
                goto out;
        }

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

out:    REC_CLOSE;
}

/*
 * __bam_split_recover --
 *      Recovery function for split.
 *
 * PUBLIC: int __bam_split_recover
 * PUBLIC:   __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
 */
int
__bam_split_recover(logp, dbtp, lsnp, redo, info)
        DB_LOG *logp;
        DBT *dbtp;
        DB_LSN *lsnp;
        int redo;
        void *info;
{
        __bam_split_args *argp;
        DB *file_dbp, *mdbp;
        DB_MPOOLFILE *mpf;
        PAGE *_lp, *lp, *np, *pp, *_rp, *rp, *sp;
        db_pgno_t pgno;
        int l_update, p_update, r_update, ret, rootsplit, t_ret;

        REC_PRINT(__bam_split_print);

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

        REC_INTRO(__bam_split_read);

        /*
         * 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.
         */
        sp = argp->pg.data;
        pgno = PGNO(sp);
        rootsplit = pgno == PGNO_ROOT;
        if (memp_fget(mpf, &argp->left, 0, &lp) != 0)
                lp = NULL;
        if (memp_fget(mpf, &argp->right, 0, &rp) != 0)
                rp = NULL;

        if (redo) {
                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, it's
                 * the page we're splitting and it gets modified.  If this is
                 * not a root split, then the left page has to exist, for the
                 * same reason.
                 */
                if (rootsplit) {
                        if ((ret = memp_fget(mpf, &pgno, 0, &pp)) != 0) {
                                (void)__db_pgerr(file_dbp, pgno);
                                pp = NULL;
                                goto out;
                        }
                        p_update =
                            log_compare(&LSN(pp), &LSN(argp->pg.data)) == 0;
                } else
                        if (lp == NULL) {
                                (void)__db_pgerr(file_dbp, argp->left);
                                goto out;
                        }
                if (lp == NULL || log_compare(&LSN(lp), &argp->llsn) == 0)
                        l_update = 1;
                if (rp == NULL || log_compare(&LSN(rp), &argp->rlsn) == 0)
                        r_update = 1;
                if (!p_update && !l_update && !r_update)
                        goto done;

                /* Allocate and initialize new left/right child pages. */
                if ((_lp = (PAGE *)__db_malloc(file_dbp->pgsize)) == NULL ||
                    (_rp = (PAGE *)__db_malloc(file_dbp->pgsize)) == NULL) {
                        ret = ENOMEM;
                        __db_err(file_dbp->dbenv, "%s", strerror(ret));
                        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 the left child is wrong, update it. */
                if (lp == NULL && (ret =
                    memp_fget(mpf, &argp->left, DB_MPOOL_CREATE, &lp)) != 0) {
                        (void)__db_pgerr(file_dbp, argp->left);
                        lp = NULL;
                        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 fatal;
                        lp = NULL;
                }

                /* If the right child is wrong, update it. */
                if (rp == NULL && (ret = memp_fget(mpf,
                    &argp->right, DB_MPOOL_CREATE, &rp)) != 0) {
                        (void)__db_pgerr(file_dbp, argp->right);
                        rp = NULL;
                        goto out;
                }
                if (r_update) {
                        memcpy(rp, _rp, file_dbp->pgsize);
                        rp->lsn = *lsnp;
                        if ((ret = memp_fput(mpf, rp, DB_MPOOL_DIRTY)) != 0)
                                goto fatal;
                        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 (file_dbp->type == DB_BTREE)
                                P_INIT(pp, file_dbp->pgsize,
                                    PGNO_ROOT, PGNO_INVALID, PGNO_INVALID,
                                    _lp->level + 1, P_IBTREE);
                        else
                                P_INIT(pp, file_dbp->pgsize,
                                    PGNO_ROOT, PGNO_INVALID, PGNO_INVALID,
                                    _lp->level + 1, P_IRECNO);
                        RE_NREC_SET(pp,
                            file_dbp->type == DB_RECNO ||
                            F_ISSET(file_dbp, DB_BT_RECNUM) ?
                            __bam_total(_lp) + __bam_total(_rp) : 0);
                        pp->lsn = *lsnp;
                        if ((ret = memp_fput(mpf, pp, DB_MPOOL_DIRTY)) != 0)
                                goto fatal;
                        pp = NULL;
                }

                /*
                 * 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 && !IS_ZERO_LSN(argp->nlsn)) {
                        if ((ret = memp_fget(mpf, &argp->npgno, 0, &np)) != 0) {
                                (void)__db_pgerr(file_dbp, argp->npgno);
                                np = NULL;
                                goto out;
                        }
                        if (log_compare(&LSN(np), &argp->nlsn) == 0) {
                                PREV_PGNO(np) = argp->right;
                                np->lsn = *lsnp;
                                if ((ret = memp_fput(mpf,
                                    np, DB_MPOOL_DIRTY)) != 0)
                                        goto fatal;
                                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 fatal;
                        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 fatal;
                                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 fatal;
                                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 && !IS_ZERO_LSN(argp->nlsn)) {
                        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 fatal;
                                np = NULL;
                        }
                }
        }

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

        if (0) {
fatal:          (void)__db_panic(file_dbp);
        }
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)
                __db_free(_lp);
        if (_rp != NULL)
                __db_free(_rp);

        REC_CLOSE;
}

/*
 * __bam_rsplit_recover --
 *      Recovery function for a reverse split.
 *
 * PUBLIC: int __bam_rsplit_recover
 * PUBLIC:   __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
 */
int
__bam_rsplit_recover(logp, dbtp, lsnp, redo, info)
        DB_LOG *logp;
        DBT *dbtp;
        DB_LSN *lsnp;
        int redo;
        void *info;
{
        __bam_rsplit_args *argp;
        DB *file_dbp, *mdbp;
        DB_MPOOLFILE *mpf;
        PAGE *pagep;
        db_pgno_t pgno;
        int cmp_n, cmp_p, modified, ret;

        REC_PRINT(__bam_rsplit_print);
        REC_INTRO(__bam_rsplit_read);

        /* Fix the root page. */
        pgno = PGNO_ROOT;
        if ((ret = memp_fget(mpf, &pgno, 0, &pagep)) != 0) {
                /* The root page must always exist. */
                __db_pgerr(file_dbp, pgno);
                goto out;
        }
        modified = 0;
        cmp_n = log_compare(lsnp, &LSN(pagep));
        cmp_p = log_compare(&LSN(pagep), &argp->rootlsn);
        if (cmp_p == 0 && redo) {
                /* Need to redo update described. */
                memcpy(pagep, argp->pgdbt.data, argp->pgdbt.size);
                pagep->pgno = PGNO_ROOT;
                pagep->lsn = *lsnp;
                modified = 1;
        } else if (cmp_n == 0 && !redo) {
                /* Need to undo update described. */
                P_INIT(pagep, file_dbp->pgsize, PGNO_ROOT,
                    argp->nrec, PGNO_INVALID, pagep->level + 1,
                    file_dbp->type == DB_BTREE ? P_IBTREE : P_IRECNO);
                if ((ret = __db_pitem(file_dbp, 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) {
                (void)__db_panic(file_dbp);
                goto out;
        }

        /*
         * 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 (!redo)
                        goto done;
                (void)__db_pgerr(file_dbp, argp->pgno);
                goto out;
        }
        modified = 0;
        cmp_n = log_compare(lsnp, &LSN(pagep));
        cmp_p = log_compare(&LSN(pagep), &LSN(argp->pgdbt.data));
        if (cmp_p == 0 && redo) {
                /* Need to redo update described. */
                pagep->lsn = *lsnp;
                modified = 1;
        } else if (cmp_n == 0 && !redo) {
                /* 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) {
                (void)__db_panic(file_dbp);
                goto out;
        }

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

out:    REC_CLOSE;
}

/*
 * __bam_adj_recover --
 *      Recovery function for adj.
 *
 * PUBLIC: int __bam_adj_recover
 * PUBLIC:   __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
 */
int
__bam_adj_recover(logp, dbtp, lsnp, redo, info)
        DB_LOG *logp;
        DBT *dbtp;
        DB_LSN *lsnp;
        int redo;
        void *info;
{
        __bam_adj_args *argp;
        DB *file_dbp, *mdbp;
        DB_MPOOLFILE *mpf;
        PAGE *pagep;
        int cmp_n, cmp_p, modified, ret;

        REC_PRINT(__bam_adj_print);
        REC_INTRO(__bam_adj_read);

        /* 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 (!redo)
                        goto done;
                (void)__db_pgerr(file_dbp, argp->pgno);
                goto out;
        }

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

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

                LSN(pagep) = 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;

        if (0) {
err:            (void)memp_fput(mpf, pagep, 0);
        }
out:    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_LOG *, DBT *, DB_LSN *, int, void *));
 */
int
__bam_cadjust_recover(logp, dbtp, lsnp, redo, info)
        DB_LOG *logp;
        DBT *dbtp;
        DB_LSN *lsnp;
        int redo;
        void *info;
{
        __bam_cadjust_args *argp;
        DB *file_dbp, *mdbp;
        DB_MPOOLFILE *mpf;
        PAGE *pagep;
        int cmp_n, cmp_p, modified, ret;

        REC_PRINT(__bam_cadjust_print);
        REC_INTRO(__bam_cadjust_read);

        /* 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 (!redo)
                        goto done;
                (void)__db_pgerr(file_dbp, argp->pgno);
                goto out;
        }

        modified = 0;
        cmp_n = log_compare(lsnp, &LSN(pagep));
        cmp_p = log_compare(&LSN(pagep), &argp->lsn);
        if (cmp_p == 0 && redo) {
                /* Need to redo update described. */
                if (file_dbp->type == DB_BTREE &&
                    F_ISSET(file_dbp, DB_BT_RECNUM)) {
                        GET_BINTERNAL(pagep, argp->indx)->nrecs += argp->adjust;
                        if (argp->total && PGNO(pagep) == PGNO_ROOT)
                                RE_NREC_ADJ(pagep, argp->adjust);
                }
                if (file_dbp->type == DB_RECNO) {
                        GET_RINTERNAL(pagep, argp->indx)->nrecs += argp->adjust;
                        if (argp->total && PGNO(pagep) == PGNO_ROOT)
                                RE_NREC_ADJ(pagep, argp->adjust);
                }

                LSN(pagep) = *lsnp;
                modified = 1;
        } else if (cmp_n == 0 && !redo) {
                /* Need to undo update described. */
                if (file_dbp->type == DB_BTREE &&
                    F_ISSET(file_dbp, DB_BT_RECNUM)) {
                        GET_BINTERNAL(pagep, argp->indx)->nrecs -= argp->adjust;
                        if (argp->total && PGNO(pagep) == PGNO_ROOT)
                                RE_NREC_ADJ(pagep, argp->adjust);
                }
                if (file_dbp->type == DB_RECNO) {
                        GET_RINTERNAL(pagep, argp->indx)->nrecs -= argp->adjust;
                        if (argp->total && PGNO(pagep) == PGNO_ROOT)
                                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;

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

out:    REC_CLOSE;
}

/*
 * __bam_cdel_recover --
 *      Recovery function for the intent-to-delete of a cursor record.
 *
 * PUBLIC: int __bam_cdel_recover
 * PUBLIC:   __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
 */
int
__bam_cdel_recover(logp, dbtp, lsnp, redo, info)
        DB_LOG *logp;
        DBT *dbtp;
        DB_LSN *lsnp;
        int redo;
        void *info;
{
        __bam_cdel_args *argp;
        DB *file_dbp, *mdbp;
        DB_MPOOLFILE *mpf;
        PAGE *pagep;
        int cmp_n, cmp_p, modified, ret;

        REC_PRINT(__bam_cdel_print);
        REC_INTRO(__bam_cdel_read);

        /* 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 (!redo)
                        goto done;
                (void)__db_pgerr(file_dbp, argp->pgno);
                goto out;
        }

        modified = 0;
        cmp_n = log_compare(lsnp, &LSN(pagep));
        cmp_p = log_compare(&LSN(pagep), &argp->lsn);
        if (cmp_p == 0 && redo) {
                /* Need to redo update described. */
                B_DSET(GET_BKEYDATA(pagep, argp->indx + O_INDX)->type);

                LSN(pagep) = *lsnp;
                modified = 1;
        } else if (cmp_n == 0 && !redo) {
                /* Need to undo update described. */
                B_DCLR(GET_BKEYDATA(pagep, argp->indx + O_INDX)->type);

                LSN(pagep) = 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;
}

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

        REC_PRINT(__bam_repl_print);
        REC_INTRO(__bam_repl_read);

        /* 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 (!redo)
                        goto done;
                (void)__db_pgerr(file_dbp, argp->pgno);
                goto out;
        }
        bk = GET_BKEYDATA(pagep, argp->indx);

        modified = 0;
        cmp_n = log_compare(lsnp, &LSN(pagep));
        cmp_p = log_compare(&LSN(pagep), &argp->lsn);
        if (cmp_p == 0 && redo) {
                /*
                 * 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 ((dbt.data = __db_malloc(dbt.size)) == NULL) {
                        ret = ENOMEM;
                        goto err;
                }
                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(file_dbp, pagep, argp->indx, &dbt);
                __db_free(dbt.data);
                if (ret != 0)
                        goto err;

                LSN(pagep) = *lsnp;
                modified = 1;
        } else if (cmp_n == 0 && !redo) {
                /*
                 * 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 ((dbt.data = __db_malloc(dbt.size)) == NULL) {
                        ret = ENOMEM;
                        goto err;
                }
                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(file_dbp, pagep, argp->indx, &dbt);
                __db_free(dbt.data);
                if (ret != 0)
                        goto err;

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

                LSN(pagep) = 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;

        if (0) {
err:            (void)memp_fput(mpf, pagep, 0);
        }
out:    REC_CLOSE;
}