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Sourcecode: db4.1 version File versions

db_rec.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996-2002
 *    Sleepycat Software.  All rights reserved.
 */

#include "db_config.h"

#ifndef lint
static const char revid[] = "$Id: db_rec.c,v 11.35 2002/08/08 03:57:49 bostic Exp $";
#endif /* not lint */

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

#include <string.h>
#endif

#include "db_int.h"
#include "dbinc/db_page.h"
#include "dbinc/log.h"
#include "dbinc/hash.h"

/*
 * PUBLIC: int __db_addrem_recover
 * PUBLIC:    __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 *
 * This log message is generated whenever we add or remove a duplicate
 * to/from a duplicate page.  On recover, we just do the opposite.
 */
int
__db_addrem_recover(dbenv, dbtp, lsnp, op, info)
      DB_ENV *dbenv;
      DBT *dbtp;
      DB_LSN *lsnp;
      db_recops op;
      void *info;
{
      __db_addrem_args *argp;
      DB *file_dbp;
      DBC *dbc;
      DB_MPOOLFILE *mpf;
      PAGE *pagep;
      u_int32_t change;
      int cmp_n, cmp_p, ret;

      pagep = NULL;
      COMPQUIET(info, NULL);
      REC_PRINT(__db_addrem_print);
      REC_INTRO(__db_addrem_read, 1);

      if ((ret = mpf->get(mpf, &argp->pgno, 0, &pagep)) != 0) {
            if (DB_UNDO(op)) {
                  /*
                   * We are undoing and the page doesn't exist.  That
                   * is equivalent to having a pagelsn of 0, so we
                   * would not have to undo anything.  In this case,
                   * don't bother creating a page.
                   */
                  goto done;
            } else
                  if ((ret = mpf->get(mpf,
                      &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0)
                        goto out;
      }

      cmp_n = log_compare(lsnp, &LSN(pagep));
      cmp_p = log_compare(&LSN(pagep), &argp->pagelsn);
      CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->pagelsn);
      change = 0;
      if ((cmp_p == 0 && DB_REDO(op) && argp->opcode == DB_ADD_DUP) ||
          (cmp_n == 0 && DB_UNDO(op) && argp->opcode == DB_REM_DUP)) {

            /* Need to redo an add, or undo a delete. */
            if ((ret = __db_pitem(dbc, pagep, argp->indx, argp->nbytes,
                argp->hdr.size == 0 ? NULL : &argp->hdr,
                argp->dbt.size == 0 ? NULL : &argp->dbt)) != 0)
                  goto out;

            change = DB_MPOOL_DIRTY;

      } else if ((cmp_n == 0 && DB_UNDO(op) && argp->opcode == DB_ADD_DUP) ||
          (cmp_p == 0 && DB_REDO(op) && argp->opcode == DB_REM_DUP)) {
            /* Need to undo an add, or redo a delete. */
            if ((ret = __db_ditem(dbc,
                pagep, argp->indx, argp->nbytes)) != 0)
                  goto out;
            change = DB_MPOOL_DIRTY;
      }

      if (change) {
            if (DB_REDO(op))
                  LSN(pagep) = *lsnp;
            else
                  LSN(pagep) = argp->pagelsn;
      }

      if ((ret = mpf->put(mpf, pagep, change)) != 0)
            goto out;
      pagep = NULL;

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

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

/*
 * PUBLIC: int __db_big_recover
 * PUBLIC:     __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__db_big_recover(dbenv, dbtp, lsnp, op, info)
      DB_ENV *dbenv;
      DBT *dbtp;
      DB_LSN *lsnp;
      db_recops op;
      void *info;
{
      __db_big_args *argp;
      DB *file_dbp;
      DBC *dbc;
      DB_MPOOLFILE *mpf;
      PAGE *pagep;
      u_int32_t change;
      int cmp_n, cmp_p, ret;

      pagep = NULL;
      COMPQUIET(info, NULL);
      REC_PRINT(__db_big_print);
      REC_INTRO(__db_big_read, 1);

      if ((ret = mpf->get(mpf, &argp->pgno, 0, &pagep)) != 0) {
            if (DB_UNDO(op)) {
                  /*
                   * We are undoing and the page doesn't exist.  That
                   * is equivalent to having a pagelsn of 0, so we
                   * would not have to undo anything.  In this case,
                   * don't bother creating a page.
                   */
                  ret = 0;
                  goto ppage;
            } else
                  if ((ret = mpf->get(mpf,
                      &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0)
                        goto out;
      }

      /*
       * There are three pages we need to check.  The one on which we are
       * adding data, the previous one whose next_pointer may have
       * been updated, and the next one whose prev_pointer may have
       * been updated.
       */
      cmp_n = log_compare(lsnp, &LSN(pagep));
      cmp_p = log_compare(&LSN(pagep), &argp->pagelsn);
      CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->pagelsn);
      change = 0;
      if ((cmp_p == 0 && DB_REDO(op) && argp->opcode == DB_ADD_BIG) ||
          (cmp_n == 0 && DB_UNDO(op) && argp->opcode == DB_REM_BIG)) {
            /* We are either redo-ing an add, or undoing a delete. */
            P_INIT(pagep, file_dbp->pgsize, argp->pgno, argp->prev_pgno,
                  argp->next_pgno, 0, P_OVERFLOW);
            OV_LEN(pagep) = argp->dbt.size;
            OV_REF(pagep) = 1;
            memcpy((u_int8_t *)pagep + P_OVERHEAD(file_dbp), argp->dbt.data,
                argp->dbt.size);
            PREV_PGNO(pagep) = argp->prev_pgno;
            change = DB_MPOOL_DIRTY;
      } else if ((cmp_n == 0 && DB_UNDO(op) && argp->opcode == DB_ADD_BIG) ||
          (cmp_p == 0 && DB_REDO(op) && argp->opcode == DB_REM_BIG)) {
            /*
             * We are either undo-ing an add or redo-ing a delete.
             * The page is about to be reclaimed in either case, so
             * there really isn't anything to do here.
             */
            change = DB_MPOOL_DIRTY;
      }
      if (change)
            LSN(pagep) = DB_REDO(op) ? *lsnp : argp->pagelsn;

      if ((ret = mpf->put(mpf, pagep, change)) != 0)
            goto out;
      pagep = NULL;

      /*
       * We only delete a whole chain of overflow.
       * Each page is handled individually
       */
      if (argp->opcode == DB_REM_BIG)
            goto done;

      /* Now check the previous page. */
ppage:      if (argp->prev_pgno != PGNO_INVALID) {
            change = 0;
            if ((ret = mpf->get(mpf, &argp->prev_pgno, 0, &pagep)) != 0) {
                  if (DB_UNDO(op)) {
                        /*
                         * We are undoing and the page doesn't exist.
                         * That is equivalent to having a pagelsn of 0,
                         * so we would not have to undo anything.  In
                         * this case, don't bother creating a page.
                         */
                        *lsnp = argp->prev_lsn;
                        ret = 0;
                        goto npage;
                  } else
                        if ((ret = mpf->get(mpf, &argp->prev_pgno,
                            DB_MPOOL_CREATE, &pagep)) != 0)
                              goto out;
            }

            cmp_n = log_compare(lsnp, &LSN(pagep));
            cmp_p = log_compare(&LSN(pagep), &argp->prevlsn);
            CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->prevlsn);

            if (cmp_p == 0 && DB_REDO(op) && argp->opcode == DB_ADD_BIG) {
                  /* Redo add, undo delete. */
                  NEXT_PGNO(pagep) = argp->pgno;
                  change = DB_MPOOL_DIRTY;
            } else if (cmp_n == 0 &&
                DB_UNDO(op) && argp->opcode == DB_ADD_BIG) {
                  /* Redo delete, undo add. */
                  NEXT_PGNO(pagep) = argp->next_pgno;
                  change = DB_MPOOL_DIRTY;
            }
            if (change)
                  LSN(pagep) = DB_REDO(op) ? *lsnp : argp->prevlsn;
            if ((ret = mpf->put(mpf, pagep, change)) != 0)
                  goto out;
      }
      pagep = NULL;

      /* Now check the next page.  Can only be set on a delete. */
npage:      if (argp->next_pgno != PGNO_INVALID) {
            change = 0;
            if ((ret = mpf->get(mpf, &argp->next_pgno, 0, &pagep)) != 0) {
                  if (DB_UNDO(op)) {
                        /*
                         * We are undoing and the page doesn't exist.
                         * That is equivalent to having a pagelsn of 0,
                         * so we would not have to undo anything.  In
                         * this case, don't bother creating a page.
                         */
                        goto done;
                  } else
                        if ((ret = mpf->get(mpf, &argp->next_pgno,
                            DB_MPOOL_CREATE, &pagep)) != 0)
                              goto out;
            }

            cmp_n = log_compare(lsnp, &LSN(pagep));
            cmp_p = log_compare(&LSN(pagep), &argp->nextlsn);
            CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->nextlsn);
            if (cmp_p == 0 && DB_REDO(op)) {
                  PREV_PGNO(pagep) = PGNO_INVALID;
                  change = DB_MPOOL_DIRTY;
            } else if (cmp_n == 0 && DB_UNDO(op)) {
                  PREV_PGNO(pagep) = argp->pgno;
                  change = DB_MPOOL_DIRTY;
            }
            if (change)
                  LSN(pagep) = DB_REDO(op) ? *lsnp : argp->nextlsn;
            if ((ret = mpf->put(mpf, pagep, change)) != 0)
                  goto out;
      }
      pagep = NULL;

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

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

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

      pagep = NULL;
      COMPQUIET(info, NULL);
      REC_PRINT(__db_ovref_print);
      REC_INTRO(__db_ovref_read, 1);

      if ((ret = mpf->get(mpf, &argp->pgno, 0, &pagep)) != 0) {
            if (DB_UNDO(op))
                  goto done;
            __db_pgerr(file_dbp, argp->pgno, ret);
            goto out;
      }

      modified = 0;
      cmp = log_compare(&LSN(pagep), &argp->lsn);
      CHECK_LSN(op, cmp, &LSN(pagep), &argp->lsn);
      if (cmp == 0 && DB_REDO(op)) {
            /* Need to redo update described. */
            OV_REF(pagep) += argp->adjust;

            pagep->lsn = *lsnp;
            modified = 1;
      } else if (log_compare(lsnp, &LSN(pagep)) == 0 && DB_UNDO(op)) {
            /* Need to undo update described. */
            OV_REF(pagep) -= argp->adjust;

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

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

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

/*
 * __db_relink_recover --
 *    Recovery function for relink.
 *
 * PUBLIC: int __db_relink_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__db_relink_recover(dbenv, dbtp, lsnp, op, info)
      DB_ENV *dbenv;
      DBT *dbtp;
      DB_LSN *lsnp;
      db_recops op;
      void *info;
{
      __db_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(__db_relink_print);
      REC_INTRO(__db_relink_read, 1);

      /*
       * 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 = mpf->get(mpf, &argp->pgno, 0, &pagep)) != 0) {
            if (DB_REDO(op)) {
                  __db_pgerr(file_dbp, argp->pgno, ret);
                  goto out;
            }
            goto next2;
      }
      modified = 0;
      if (argp->opcode == DB_ADD_PAGE)
            goto next1;

      cmp_p = log_compare(&LSN(pagep), &argp->lsn);
      CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->lsn);
      if (cmp_p == 0 && DB_REDO(op)) {
            /* Redo the relink. */
            pagep->lsn = *lsnp;
            modified = 1;
      } else if (log_compare(lsnp, &LSN(pagep)) == 0 && DB_UNDO(op)) {
            /* Undo the relink. */
            pagep->next_pgno = argp->next;
            pagep->prev_pgno = argp->prev;

            pagep->lsn = argp->lsn;
            modified = 1;
      }
next1:      if ((ret = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
            goto out;
      pagep = NULL;

next2:      if ((ret = mpf->get(mpf, &argp->next, 0, &pagep)) != 0) {
            if (DB_REDO(op)) {
                  __db_pgerr(file_dbp, argp->next, ret);
                  goto out;
            }
            goto prev;
      }
      modified = 0;
      cmp_n = log_compare(lsnp, &LSN(pagep));
      cmp_p = log_compare(&LSN(pagep), &argp->lsn_next);
      CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->lsn_next);
      if ((argp->opcode == DB_REM_PAGE && cmp_p == 0 && DB_REDO(op)) ||
          (argp->opcode == DB_ADD_PAGE && cmp_n == 0 && DB_UNDO(op))) {
            /* Redo the remove or undo the add. */
            pagep->prev_pgno = argp->prev;

            modified = 1;
      } else if ((argp->opcode == DB_REM_PAGE && cmp_n == 0 && DB_UNDO(op)) ||
          (argp->opcode == DB_ADD_PAGE && cmp_p == 0 && DB_REDO(op))) {
            /* Undo the remove or redo the add. */
            pagep->prev_pgno = argp->pgno;

            modified = 1;
      }
      if (modified == 1) {
            if (DB_UNDO(op))
                  pagep->lsn = argp->lsn_next;
            else
                  pagep->lsn = *lsnp;
      }
      if ((ret = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
            goto out;
      pagep = NULL;
      if (argp->opcode == DB_ADD_PAGE)
            goto done;

prev: if ((ret = mpf->get(mpf, &argp->prev, 0, &pagep)) != 0) {
            if (DB_REDO(op)) {
                  __db_pgerr(file_dbp, argp->prev, ret);
                  goto out;
            }
            goto done;
      }
      modified = 0;
      cmp_p = log_compare(&LSN(pagep), &argp->lsn_prev);
      CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->lsn_prev);
      if (cmp_p == 0 && DB_REDO(op)) {
            /* Redo the relink. */
            pagep->next_pgno = argp->next;

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

            modified = 1;
      }
      if (modified == 1) {
            if (DB_UNDO(op))
                  pagep->lsn = argp->lsn_prev;
            else
                  pagep->lsn = *lsnp;
      }
      if ((ret = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
            goto out;
      pagep = NULL;

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

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

/*
 * __db_debug_recover --
 *    Recovery function for debug.
 *
 * PUBLIC: int __db_debug_recover __P((DB_ENV *,
 * PUBLIC:     DBT *, DB_LSN *, db_recops, void *));
 */
int
__db_debug_recover(dbenv, dbtp, lsnp, op, info)
      DB_ENV *dbenv;
      DBT *dbtp;
      DB_LSN *lsnp;
      db_recops op;
      void *info;
{
      __db_debug_args *argp;
      int ret;

      COMPQUIET(dbenv, NULL);
      COMPQUIET(op, DB_TXN_ABORT);
      COMPQUIET(info, NULL);

      REC_PRINT(__db_debug_print);
      REC_NOOP_INTRO(__db_debug_read);

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

      REC_NOOP_CLOSE;
}

/*
 * __db_noop_recover --
 *    Recovery function for noop.
 *
 * PUBLIC: int __db_noop_recover __P((DB_ENV *,
 * PUBLIC:      DBT *, DB_LSN *, db_recops, void *));
 */
int
__db_noop_recover(dbenv, dbtp, lsnp, op, info)
      DB_ENV *dbenv;
      DBT *dbtp;
      DB_LSN *lsnp;
      db_recops op;
      void *info;
{
      __db_noop_args *argp;
      DB *file_dbp;
      DBC *dbc;
      DB_MPOOLFILE *mpf;
      PAGE *pagep;
      u_int32_t change;
      int cmp_n, cmp_p, ret;

      pagep = NULL;
      COMPQUIET(info, NULL);
      REC_PRINT(__db_noop_print);
      REC_INTRO(__db_noop_read, 0);

      if ((ret = mpf->get(mpf, &argp->pgno, 0, &pagep)) != 0)
            goto out;

      cmp_n = log_compare(lsnp, &LSN(pagep));
      cmp_p = log_compare(&LSN(pagep), &argp->prevlsn);
      CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->prevlsn);
      change = 0;
      if (cmp_p == 0 && DB_REDO(op)) {
            LSN(pagep) = *lsnp;
            change = DB_MPOOL_DIRTY;
      } else if (cmp_n == 0 && DB_UNDO(op)) {
            LSN(pagep) = argp->prevlsn;
            change = DB_MPOOL_DIRTY;
      }
      ret = mpf->put(mpf, pagep, change);
      pagep = NULL;

done: *lsnp = argp->prev_lsn;
out:  if (pagep != NULL)
            (void)mpf->put(mpf, pagep, 0);
      REC_CLOSE;
}

/*
 * __db_pg_alloc_recover --
 *    Recovery function for pg_alloc.
 *
 * PUBLIC: int __db_pg_alloc_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__db_pg_alloc_recover(dbenv, dbtp, lsnp, op, info)
      DB_ENV *dbenv;
      DBT *dbtp;
      DB_LSN *lsnp;
      db_recops op;
      void *info;
{
      __db_pg_alloc_args *argp;
      DB *file_dbp;
      DBC *dbc;
      DBMETA *meta;
      DB_MPOOLFILE *mpf;
      PAGE *pagep;
      db_pgno_t pgno;
      int cmp_n, cmp_p, created, level, modified, ret;

      meta = NULL;
      pagep = NULL;
      REC_PRINT(__db_pg_alloc_print);
      REC_INTRO(__db_pg_alloc_read, 0);

      /*
       * 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_BASE_MD;
      if ((ret = mpf->get(mpf, &pgno, 0, &meta)) != 0) {
            /* The metadata page must always exist on redo. */
            if (DB_REDO(op)) {
                  __db_pgerr(file_dbp, pgno, ret);
                  goto out;
            } else
                  goto done;
      }
      created = modified = 0;
      if ((ret = mpf->get(mpf, &argp->pgno, 0, &pagep)) != 0) {
            /*
             * We have to be able to identify if a page was newly
             * created so we can recover it properly.  We cannot simply
             * look for an empty header, because hash uses a pgin
             * function that will set the header.  Instead, we explicitly
             * try for the page without CREATE and if that fails, then
             * create it.
             */
            if ((ret =
                mpf->get(mpf, &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0) {
                  __db_pgerr(file_dbp, argp->pgno, ret);
                  goto out;
            }
            created = modified = 1;
      }

      /* Fix up the allocated page. */
      cmp_n = log_compare(lsnp, &LSN(pagep));
      cmp_p = log_compare(&LSN(pagep), &argp->page_lsn);

      /*
       * If an inital allocation is aborted and then reallocated
       * during an archival restore the log record will have
       * an LSN for the page but the page will be empty.
       */
      if (IS_ZERO_LSN(LSN(pagep)))
            cmp_p = 0;
      CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->page_lsn);
      /*
       * If we we rolled back this allocation previously during an
       * archive restore, the page may have the LSN of the meta page
       * at the point of the roll back.  This will be no more
       * than the LSN of the metadata page at the time of this allocation.
       * Another special case we have to handle is if we ended up with a
       * page of all 0's which can happen if we abort between allocating a
       * page in mpool and initializing it.  In that case, even if we're
       * undoing, we need to re-initialize the page.
       */
      if (DB_REDO(op) &&
          (cmp_p == 0 ||
          (IS_ZERO_LSN(argp->page_lsn) &&
          log_compare(&LSN(pagep), &argp->meta_lsn) <= 0))) {
            /* Need to redo update described. */
            switch (argp->ptype) {
            case P_LBTREE:
            case P_LRECNO:
            case P_LDUP:
                  level = LEAFLEVEL;
                  break;
            default:
                  level = 0;
                  break;
            }
            P_INIT(pagep, file_dbp->pgsize,
                argp->pgno, PGNO_INVALID, PGNO_INVALID, level, argp->ptype);

            pagep->lsn = *lsnp;
            modified = 1;
      } else if (DB_UNDO(op) && (cmp_n == 0 || created)) {
            /*
             * This is where we handle the case of a 0'd page (pagep->pgno
             * is equal to PGNO_INVALID).
             * Undo the allocation, reinitialize the page and
             * link its next pointer to the free list.
             */
            P_INIT(pagep, file_dbp->pgsize,
                argp->pgno, PGNO_INVALID, argp->next, 0, P_INVALID);

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

      /*
       * If the page was newly created, put it on the limbo list.
       */
      if (IS_ZERO_LSN(LSN(pagep)) &&
          IS_ZERO_LSN(argp->page_lsn) && DB_UNDO(op)) {
            /* Put the page in limbo.*/
            if ((ret = __db_add_limbo(dbenv,
                info, argp->fileid, argp->pgno, 1)) != 0)
                  goto out;
      }

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

      /* Fix up the metadata page. */
      modified = 0;
      cmp_n = log_compare(lsnp, &LSN(meta));
      cmp_p = log_compare(&LSN(meta), &argp->meta_lsn);
      CHECK_LSN(op, cmp_p, &LSN(meta), &argp->meta_lsn);
      if (cmp_p == 0 && DB_REDO(op)) {
            /* Need to redo update described. */
            LSN(meta) = *lsnp;
            meta->free = argp->next;
            modified = 1;
      } else if (cmp_n == 0 && DB_UNDO(op)) {
            /* Need to undo update described. */
            LSN(meta) = argp->meta_lsn;

            /*
             * If the page has a zero LSN then its newly created
             * and will go into limbo rather than directly on the
             * free list.
             */
            if (!IS_ZERO_LSN(argp->page_lsn))
                  meta->free = argp->pgno;
            modified = 1;
      }
      if ((ret = mpf->put(mpf, meta, modified ? DB_MPOOL_DIRTY : 0)) != 0)
            goto out;
      meta = NULL;
      /*
       * This could be the metapage from a subdb which is read from disk
       * to recover its creation.
       */
      if (F_ISSET(file_dbp, DB_AM_SUBDB))
            switch (argp->type) {
            case P_BTREEMETA:
            case P_HASHMETA:
            case P_QAMMETA:
                  file_dbp->sync(file_dbp, 0);
                  break;
            }

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

out:  if (pagep != NULL)
            (void)mpf->put(mpf, pagep, 0);
      if (meta != NULL)
            (void)mpf->put(mpf, meta, 0);
      if (ret == ENOENT && op == DB_TXN_BACKWARD_ALLOC)
            ret = 0;
      REC_CLOSE;
}

/*
 * __db_pg_free_recover --
 *    Recovery function for pg_free.
 *
 * PUBLIC: int __db_pg_free_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__db_pg_free_recover(dbenv, dbtp, lsnp, op, info)
      DB_ENV *dbenv;
      DBT *dbtp;
      DB_LSN *lsnp;
      db_recops op;
      void *info;
{
      __db_pg_free_args *argp;
      DB *file_dbp;
      DBC *dbc;
      DBMETA *meta;
      DB_LSN copy_lsn;
      DB_MPOOLFILE *mpf;
      PAGE *pagep;
      db_pgno_t pgno;
      int cmp_n, cmp_p, modified, ret;

      COMPQUIET(info, NULL);
      meta = NULL;
      pagep = NULL;
      REC_PRINT(__db_pg_free_print);
      REC_INTRO(__db_pg_free_read, 1);

      /*
       * 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.
       * Create the page if necessary, we may be freeing an aborted
       * create.
       */
      if ((ret = mpf->get(mpf, &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0)
            goto out;
      modified = 0;
      (void)__ua_memcpy(&copy_lsn, &LSN(argp->header.data), sizeof(DB_LSN));
      cmp_n = log_compare(lsnp, &LSN(pagep));
      cmp_p = log_compare(&LSN(pagep), &copy_lsn);
      CHECK_LSN(op, cmp_p, &LSN(pagep), &copy_lsn);
      if (DB_REDO(op) &&
          (cmp_p == 0 ||
          (IS_ZERO_LSN(copy_lsn) &&
          log_compare(&LSN(pagep), &argp->meta_lsn) <= 0))) {
            /* Need to redo update described. */
            P_INIT(pagep, file_dbp->pgsize,
                argp->pgno, PGNO_INVALID, argp->next, 0, P_INVALID);
            pagep->lsn = *lsnp;

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

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

      /*
       * 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_BASE_MD;
      if ((ret = mpf->get(mpf, &pgno, 0, &meta)) != 0) {
            /* The metadata page must always exist. */
            __db_pgerr(file_dbp, pgno, ret);
            goto out;
      }

      modified = 0;
      cmp_n = log_compare(lsnp, &LSN(meta));
      cmp_p = log_compare(&LSN(meta), &argp->meta_lsn);
      CHECK_LSN(op, cmp_p, &LSN(meta), &argp->meta_lsn);
      if (cmp_p == 0 && DB_REDO(op)) {
            /* Need to redo the deallocation. */
            meta->free = argp->pgno;
            LSN(meta) = *lsnp;
            modified = 1;
      } else if (cmp_n == 0 && DB_UNDO(op)) {
            /* Need to undo the deallocation. */
            meta->free = argp->next;
            LSN(meta) = argp->meta_lsn;
            modified = 1;
      }
      if ((ret = mpf->put(mpf, meta, modified ? DB_MPOOL_DIRTY : 0)) != 0)
            goto out;
      meta = NULL;

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

out:  if (pagep != NULL)
            (void)mpf->put(mpf, pagep, 0);
      if (meta != NULL)
            (void)mpf->put(mpf, meta, 0);
      REC_CLOSE;
}

/*
 * __db_cksum_recover --
 *    Recovery function for checksum failure log record.
 *
 * PUBLIC: int __db_cksum_recover __P((DB_ENV *,
 * PUBLIC:      DBT *, DB_LSN *, db_recops, void *));
 */
int
__db_cksum_recover(dbenv, dbtp, lsnp, op, info)
      DB_ENV *dbenv;
      DBT *dbtp;
      DB_LSN *lsnp;
      db_recops op;
      void *info;
{
      __db_cksum_args *argp;

      int ret;

      COMPQUIET(info, NULL);
      COMPQUIET(lsnp, NULL);
      COMPQUIET(op, DB_TXN_ABORT);

      REC_PRINT(__db_cksum_print);

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

      /*
       * We had a checksum failure -- the only option is to run catastrophic
       * recovery.
       */
      if (F_ISSET(dbenv, DB_ENV_FATAL))
            ret = 0;
      else {
            __db_err(dbenv,
                "Checksum failure requires catastrophic recovery");
            ret = __db_panic(dbenv, DB_RUNRECOVERY);
      }

      __os_free(dbenv, argp);
      return (ret);
}

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