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bt_rec.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996, 1997, 1998, 1999, 2000
 *    Sleepycat Software.  All rights reserved.
 */

#include "db_config.h"

#ifndef lint
static const char revid[] = "$Id: bt_rec.c,v 11.35 2001/01/10 16:24:47 ubell Exp $";
#endif /* not lint */

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

#include <string.h>
#endif

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

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

/*
 * __bam_pg_alloc_recover --
 *    Recovery function for pg_alloc.
 *
 * PUBLIC: int __bam_pg_alloc_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__bam_pg_alloc_recover(dbenv, dbtp, lsnp, op, info)
      DB_ENV *dbenv;
      DBT *dbtp;
      DB_LSN *lsnp;
      db_recops op;
      void *info;
{
      __bam_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, level, modified, ret;

      REC_PRINT(__bam_pg_alloc_print);
      REC_INTRO(__bam_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;
      meta = NULL;
      if ((ret = memp_fget(mpf, &pgno, 0, &meta)) != 0) {
            /* The metadata page must always exist on redo. */
            if (DB_REDO(op)) {
                  (void)__db_pgerr(file_dbp, pgno);
                  goto out;
            } else
                  goto done;
      }
      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);
            goto err;
      }

      /* Fix up the allocated page. */
      modified = 0;
      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.
       */
      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 (cmp_n == 0 && DB_UNDO(op)) {
            /*
             * 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 ((ret = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0) {
            goto err;
      }

      /*
       * 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 err;
      }

      /* 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 = memp_fput(mpf, meta, modified ? DB_MPOOL_DIRTY : 0)) != 0)
            goto out;
      /*
       * 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;

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

/*
 * __bam_pg_free_recover --
 *    Recovery function for pg_free.
 *
 * PUBLIC: int __bam_pg_free_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__bam_pg_free_recover(dbenv, dbtp, lsnp, op, info)
      DB_ENV *dbenv;
      DBT *dbtp;
      DB_LSN *lsnp;
      db_recops op;
      void *info;
{
      __bam_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);
      REC_PRINT(__bam_pg_free_print);
      REC_INTRO(__bam_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 = memp_fget(mpf, &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0)
            goto out;
      modified = 0;
      __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 = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
            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_BASE_MD;
      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);
      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 = memp_fput(mpf, meta, modified ? DB_MPOOL_DIRTY : 0)) != 0)
            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_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);

      /*
       * 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, NULL, &sp)) != 0)
            goto out;
      memcpy(sp, argp->pg.data, argp->pg.size);

      pgno = PGNO(sp);
      root_pgno = argp->root_pgno;
      rootsplit = pgno == root_pgno;
      if (memp_fget(mpf, &argp->left, 0, &lp) != 0)
            lp = NULL;
      if (memp_fget(mpf, &argp->right, 0, &rp) != 0)
            rp = NULL;

      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, 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;
                  }
                  cmp = log_compare(&LSN(pp), &LSN(argp->pg.data));
                  CHECK_LSN(op, cmp, &LSN(pp), &LSN(argp->pg.data));
                  p_update = cmp  == 0;
            } else if (lp == NULL) {
                  (void)__db_pgerr(file_dbp, argp->left);
                  goto out;
            }

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

            if (rp != NULL) {
                  cmp = log_compare(&LSN(rp), &argp->rlsn);
                  CHECK_LSN(op, cmp, &LSN(rp), &argp->rlsn);
                  if (cmp == 0)
                        r_update = 1;
            } else
                  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, NULL, &_lp)) != 0
                || (ret =
                __os_malloc(dbenv, file_dbp->pgsize, NULL, &_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 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 out;
                  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 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(_lp) + __bam_total(_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 && !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;
                  }
                  cmp = log_compare(&LSN(np), &argp->nlsn);
                  CHECK_LSN(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 && !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 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(_lp, file_dbp->pgsize);
      if (_rp != NULL)
            __os_free(_rp, file_dbp->pgsize);
      if (sp != NULL)
            __os_free(sp, argp->pg.size);

      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;
      int cmp_n, cmp_p, modified, ret;

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

      /* Fix the root page. */
      pgno = root_pgno = argp->root_pgno;
      if ((ret = memp_fget(mpf, &pgno, 0, &pagep)) != 0) {
            /* The root page must always exist if we are going forward. */
            if (DB_REDO(op)) {
                  __db_pgerr(file_dbp, pgno);
                  goto out;
            }
            /* This must be the root of an OPD tree. */
            DB_ASSERT(root_pgno !=
                ((BTREE *)file_dbp->bt_internal)->bt_root);
            ret = 0;
            goto done;
      }
      modified = 0;
      cmp_n = log_compare(lsnp, &LSN(pagep));
      cmp_p = log_compare(&LSN(pagep), &argp->rootlsn);
      CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->rootlsn);
      if (cmp_p == 0 && DB_REDO(op)) {
            /* Need to redo update described. */
            memcpy(pagep, argp->pgdbt.data, argp->pgdbt.size);
            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;

      /*
       * 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 (DB_UNDO(op))
                  goto done;
            (void)__db_pgerr(file_dbp, argp->pgno);
            goto out;
      }
      modified = 0;
      __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(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;

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_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;

      COMPQUIET(info, NULL);
      REC_PRINT(__bam_adj_print);
      REC_INTRO(__bam_adj_read, 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 (DB_UNDO(op))
                  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);
      CHECK_LSN(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 err;

            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 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_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;

      COMPQUIET(info, NULL);
      REC_PRINT(__bam_cadjust_print);
      REC_INTRO(__bam_cadjust_read, 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 (DB_UNDO(op))
                  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);
      CHECK_LSN(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(pagep, argp->indx)->nrecs += argp->adjust;
                  if (argp->opflags & CAD_UPDATEROOT)
                        RE_NREC_ADJ(pagep, argp->adjust);
            } else {
                  GET_RINTERNAL(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(pagep, argp->indx)->nrecs -= argp->adjust;
                  if (argp->opflags & CAD_UPDATEROOT)
                        RE_NREC_ADJ(pagep, -(argp->adjust));
            } else {
                  GET_RINTERNAL(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;

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_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;

      COMPQUIET(info, NULL);
      REC_PRINT(__bam_cdel_print);
      REC_INTRO(__bam_cdel_read, 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 (DB_UNDO(op))
                  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);
      CHECK_LSN(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(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(pagep, indx)->type);

            (void)__bam_ca_delete(file_dbp, argp->pgno, argp->indx, 0);

            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_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;

      COMPQUIET(info, NULL);
      REC_PRINT(__bam_repl_print);
      REC_INTRO(__bam_repl_read, 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 (DB_UNDO(op))
                  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);
      CHECK_LSN(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, NULL, &dbt.data)) != 0)
                  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(dbc, pagep, argp->indx, &dbt);
            __os_free(dbt.data, dbt.size);
            if (ret != 0)
                  goto err;

            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, NULL, &dbt.data)) != 0)
                  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(dbc, pagep, argp->indx, &dbt);
            __os_free(dbt.data, dbt.size);
            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;
}

/*
 * __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;

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

      if ((ret = memp_fget(mpf, &argp->meta_pgno, 0, &meta)) != 0) {
            /* The metadata page must always exist on redo. */
            if (DB_REDO(op)) {
                  (void)__db_pgerr(file_dbp, argp->meta_pgno);
                  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(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;

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

out:  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);

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

      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:
            __bam_ca_undosplit(file_dbp, argp->from_pgno,
                argp->to_pgno, argp->left_pgno, argp->from_indx);
            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);
      rdbc = NULL;

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

      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_icursor(file_dbp, NULL, DB_RECNO, argp->root, 0, &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;
            __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;
            __ram_ca(rdbc, CA_DELETE);
            break;
      }

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

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