Logo Search packages:      
Sourcecode: db3 version File versions  Download package

hash_rec.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996, 1997, 1998, 1999, 2000
 *    Sleepycat Software.  All rights reserved.
 */
/*
 * Copyright (c) 1995, 1996
 *    Margo Seltzer.  All rights reserved.
 */
/*
 * Copyright (c) 1995, 1996
 *    The President and Fellows of Harvard University.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Margo Seltzer.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "db_config.h"

#ifndef lint
static const char revid[] = "$Id: hash_rec.c,v 11.34 2001/01/11 18:19:52 bostic 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 "db_shash.h"
#include "btree.h"
#include "hash.h"
#include "lock.h"
#include "log.h"
#include "mp.h"

static int __ham_alloc_pages __P((DB *, __ham_groupalloc_args *));

/*
 * __ham_insdel_recover --
 *
 * PUBLIC: int __ham_insdel_recover
 * PUBLIC:     __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__ham_insdel_recover(dbenv, dbtp, lsnp, op, info)
      DB_ENV *dbenv;
      DBT *dbtp;
      DB_LSN *lsnp;
      db_recops op;
      void *info;
{
      __ham_insdel_args *argp;
      DB *file_dbp;
      DBC *dbc;
      DB_MPOOLFILE *mpf;
      PAGE *pagep;
      u_int32_t opcode;
      int cmp_n, cmp_p, flags, getmeta, ret, type;

      COMPQUIET(info, NULL);

      getmeta = 0;
      REC_PRINT(__ham_insdel_print);
      REC_INTRO(__ham_insdel_read, 1);

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

      if ((ret = __ham_get_meta(dbc)) != 0)
            goto out;
      getmeta = 1;

      cmp_n = log_compare(lsnp, &LSN(pagep));
      cmp_p = log_compare(&LSN(pagep), &argp->pagelsn);
      CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->pagelsn);
      /*
       * Two possible things going on:
       * redo a delete/undo a put: delete the item from the page.
       * redo a put/undo a delete: add the item to the page.
       * If we are undoing a delete, then the information logged is the
       * entire entry off the page, not just the data of a dbt.  In
       * this case, we want to copy it back onto the page verbatim.
       * We do this by calling __putitem with the type H_OFFPAGE instead
       * of H_KEYDATA.
       */
      opcode = OPCODE_OF(argp->opcode);

      flags = 0;
      if ((opcode == DELPAIR && cmp_n == 0 && DB_UNDO(op)) ||
          (opcode == PUTPAIR && cmp_p == 0 && DB_REDO(op))) {
            /*
             * Need to redo a PUT or undo a delete.  If we are undoing a
             * delete, we've got to restore the item back to its original
             * position.  That's a royal pain in the butt (because we do
             * not store item lengths on the page), but there's no choice.
             */
            if (opcode != DELPAIR ||
                argp->ndx == (u_int32_t)NUM_ENT(pagep)) {
                  __ham_putitem(pagep, &argp->key,
                      DB_UNDO(op) || PAIR_ISKEYBIG(argp->opcode) ?
                      H_OFFPAGE : H_KEYDATA);

                  if (PAIR_ISDATADUP(argp->opcode))
                        type = H_DUPLICATE;
                  else if (DB_UNDO(op) || PAIR_ISDATABIG(argp->opcode))
                        type = H_OFFPAGE;
                  else
                        type = H_KEYDATA;
                  __ham_putitem(pagep, &argp->data, type);
            } else
                  (void)__ham_reputpair(pagep, file_dbp->pgsize,
                      argp->ndx, &argp->key, &argp->data);

            LSN(pagep) = DB_REDO(op) ? *lsnp : argp->pagelsn;
            flags = DB_MPOOL_DIRTY;

      } else if ((opcode == DELPAIR && cmp_p == 0 && DB_REDO(op))
          || (opcode == PUTPAIR && cmp_n == 0 && DB_UNDO(op))) {
            /* Need to undo a put or redo a delete. */
            __ham_dpair(file_dbp, pagep, argp->ndx);
            LSN(pagep) = DB_REDO(op) ? *lsnp : argp->pagelsn;
            flags = DB_MPOOL_DIRTY;
      }

      if ((ret = memp_fput(file_dbp->mpf, pagep, flags)) != 0)
            goto out;

      /* Return the previous LSN. */
done: *lsnp = argp->prev_lsn;
      ret = 0;

out:  if (getmeta)
            (void)__ham_release_meta(dbc);
      REC_CLOSE;
}

/*
 * __ham_newpage_recover --
 *    This log message is used when we add/remove overflow pages.  This
 *    message takes care of the pointer chains, not the data on the pages.
 *
 * PUBLIC: int __ham_newpage_recover
 * PUBLIC:     __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__ham_newpage_recover(dbenv, dbtp, lsnp, op, info)
      DB_ENV *dbenv;
      DBT *dbtp;
      DB_LSN *lsnp;
      db_recops op;
      void *info;
{
      __ham_newpage_args *argp;
      DB *file_dbp;
      DBC *dbc;
      DB_MPOOLFILE *mpf;
      PAGE *pagep;
      int cmp_n, cmp_p, flags, getmeta, ret;

      COMPQUIET(info, NULL);

      getmeta = 0;
      REC_PRINT(__ham_newpage_print);
      REC_INTRO(__ham_newpage_read, 1);

      if ((ret = memp_fget(mpf, &argp->new_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 = memp_fget(mpf, &argp->new_pgno,
                DB_MPOOL_CREATE, &pagep)) != 0)
                  goto out;
      }

      if ((ret = __ham_get_meta(dbc)) != 0)
            goto out;
      getmeta = 1;

      /*
       * There are potentially three pages we need to check: the one
       * that we created/deleted, the one before it and the one after
       * it.
       */

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

      flags = 0;
      if ((cmp_p == 0 && DB_REDO(op) && argp->opcode == PUTOVFL) ||
          (cmp_n == 0 && DB_UNDO(op) && argp->opcode == DELOVFL)) {
            /* Redo a create new page or undo a delete new page. */
            P_INIT(pagep, file_dbp->pgsize, argp->new_pgno,
                argp->prev_pgno, argp->next_pgno, 0, P_HASH);
            flags = DB_MPOOL_DIRTY;
      } else if ((cmp_p == 0 && DB_REDO(op) && argp->opcode == DELOVFL) ||
          (cmp_n == 0 && DB_UNDO(op) && argp->opcode == PUTOVFL)) {
            /*
             * Redo a delete or undo a create new page.  All we
             * really need to do is change the LSN.
             */
            flags = DB_MPOOL_DIRTY;
      }

      if (flags)
            LSN(pagep) = DB_REDO(op) ? *lsnp : argp->pagelsn;

      if ((ret = memp_fput(file_dbp->mpf, pagep, flags)) != 0)
            goto out;

      /* Now do the prev page. */
ppage:      if (argp->prev_pgno != PGNO_INVALID) {
            if ((ret = memp_fget(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.
                         */
                        ret = 0;
                        goto npage;
                  } else if ((ret =
                      memp_fget(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);
            flags = 0;

            if ((cmp_p == 0 && DB_REDO(op) && argp->opcode == PUTOVFL) ||
                (cmp_n == 0 && DB_UNDO(op) && argp->opcode == DELOVFL)) {
                  /* Redo a create new page or undo a delete new page. */
                  pagep->next_pgno = argp->new_pgno;
                  flags = DB_MPOOL_DIRTY;
            } else if ((cmp_p == 0 && DB_REDO(op) && argp->opcode == DELOVFL) ||
                (cmp_n == 0 && DB_UNDO(op) && argp->opcode == PUTOVFL)) {
                  /* Redo a delete or undo a create new page. */
                  pagep->next_pgno = argp->next_pgno;
                  flags = DB_MPOOL_DIRTY;
            }

            if (flags)
                  LSN(pagep) = DB_REDO(op) ? *lsnp : argp->prevlsn;

            if ((ret = memp_fput(file_dbp->mpf, pagep, flags)) != 0)
                  goto out;
      }

      /* Now time to do the next page */
npage:      if (argp->next_pgno != PGNO_INVALID) {
            if ((ret = memp_fget(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 =
                      memp_fget(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);
            flags = 0;

            if ((cmp_p == 0 && DB_REDO(op) && argp->opcode == PUTOVFL) ||
                (cmp_n == 0 && DB_UNDO(op) && argp->opcode == DELOVFL)) {
                  /* Redo a create new page or undo a delete new page. */
                  pagep->prev_pgno = argp->new_pgno;
                  flags = DB_MPOOL_DIRTY;
            } else if ((cmp_p == 0 && DB_REDO(op) && argp->opcode == DELOVFL) ||
                (cmp_n == 0 && DB_UNDO(op) && argp->opcode == PUTOVFL)) {
                  /* Redo a delete or undo a create new page. */
                  pagep->prev_pgno = argp->prev_pgno;
                  flags = DB_MPOOL_DIRTY;
            }

            if (flags)
                  LSN(pagep) = DB_REDO(op) ? *lsnp : argp->nextlsn;

            if ((ret = memp_fput(file_dbp->mpf, pagep, flags)) != 0)
                  goto out;
      }
done: *lsnp = argp->prev_lsn;
      ret = 0;

out:  if (getmeta)
            (void)__ham_release_meta(dbc);
      REC_CLOSE;
}

/*
 * __ham_replace_recover --
 *    This log message refers to partial puts that are local to a single
 *    page.  You can think of them as special cases of the more general
 *    insdel log message.
 *
 * PUBLIC: int __ham_replace_recover
 * PUBLIC:    __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__ham_replace_recover(dbenv, dbtp, lsnp, op, info)
      DB_ENV *dbenv;
      DBT *dbtp;
      DB_LSN *lsnp;
      db_recops op;
      void *info;
{
      __ham_replace_args *argp;
      DB *file_dbp;
      DBC *dbc;
      DB_MPOOLFILE *mpf;
      DBT dbt;
      PAGE *pagep;
      int32_t grow;
      int cmp_n, cmp_p, flags, getmeta, ret;
      u_int8_t *hk;

      COMPQUIET(info, NULL);

      getmeta = 0;
      REC_PRINT(__ham_replace_print);
      REC_INTRO(__ham_replace_read, 1);

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

      if ((ret = __ham_get_meta(dbc)) != 0)
            goto out;
      getmeta = 1;

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

      memset(&dbt, 0, sizeof(dbt));
      flags = 0;
      grow = 1;

      if (cmp_p == 0 && DB_REDO(op)) {
            /* Reapply the change as specified. */
            dbt.data = argp->newitem.data;
            dbt.size = argp->newitem.size;
            grow = argp->newitem.size - argp->olditem.size;
            LSN(pagep) = *lsnp;
            flags = DB_MPOOL_DIRTY;
      } else if (cmp_n == 0 && DB_UNDO(op)) {
            /* Undo the already applied change. */
            dbt.data = argp->olditem.data;
            dbt.size = argp->olditem.size;
            grow = argp->olditem.size - argp->newitem.size;
            LSN(pagep) = argp->pagelsn;
            flags = DB_MPOOL_DIRTY;
      }

      if (flags) {
            __ham_onpage_replace(pagep,
                file_dbp->pgsize, argp->ndx, argp->off, grow, &dbt);
            if (argp->makedup) {
                  hk = P_ENTRY(pagep, argp->ndx);
                  if (DB_REDO(op))
                        HPAGE_PTYPE(hk) = H_DUPLICATE;
                  else
                        HPAGE_PTYPE(hk) = H_KEYDATA;
            }
      }

      if ((ret = memp_fput(file_dbp->mpf, pagep, flags)) != 0)
            goto out;

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

out:  if (getmeta)
            (void)__ham_release_meta(dbc);
      REC_CLOSE;
}

/*
 * __ham_splitdata_recover --
 *
 * PUBLIC: int __ham_splitdata_recover
 * PUBLIC:    __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__ham_splitdata_recover(dbenv, dbtp, lsnp, op, info)
      DB_ENV *dbenv;
      DBT *dbtp;
      DB_LSN *lsnp;
      db_recops op;
      void *info;
{
      __ham_splitdata_args *argp;
      DB *file_dbp;
      DBC *dbc;
      DB_MPOOLFILE *mpf;
      PAGE *pagep;
      int cmp_n, cmp_p, flags, getmeta, ret;

      COMPQUIET(info, NULL);

      getmeta = 0;
      REC_PRINT(__ham_splitdata_print);
      REC_INTRO(__ham_splitdata_read, 1);

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

      if ((ret = __ham_get_meta(dbc)) != 0)
            goto out;
      getmeta = 1;

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

      /*
       * There are two types of log messages here, one for the old page
       * and one for the new pages created.  The original image in the
       * SPLITOLD record is used for undo.  The image in the SPLITNEW
       * is used for redo.  We should never have a case where there is
       * a redo operation and the SPLITOLD record is on disk, but not
       * the SPLITNEW record.  Therefore, we only have work to do when
       * redo NEW messages and undo OLD messages, but we have to update
       * LSNs in both cases.
       */
      flags = 0;
      if (cmp_p == 0 && DB_REDO(op)) {
            if (argp->opcode == SPLITNEW)
                  /* Need to redo the split described. */
                  memcpy(pagep, argp->pageimage.data,
                      argp->pageimage.size);
            LSN(pagep) = *lsnp;
            flags = DB_MPOOL_DIRTY;
      } else if (cmp_n == 0 && DB_UNDO(op)) {
            if (argp->opcode == SPLITOLD) {
                  /* Put back the old image. */
                  memcpy(pagep, argp->pageimage.data,
                      argp->pageimage.size);
            } else
                  P_INIT(pagep, file_dbp->pgsize, argp->pgno,
                      PGNO_INVALID, PGNO_INVALID, 0, P_HASH);
            LSN(pagep) = argp->pagelsn;
            flags = DB_MPOOL_DIRTY;
      }
      if ((ret = memp_fput(file_dbp->mpf, pagep, flags)) != 0)
            goto out;

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

out:  if (getmeta)
            (void)__ham_release_meta(dbc);
      REC_CLOSE;
}

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

      COMPQUIET(info, NULL);

      getmeta = 0;
      REC_PRINT(__ham_copypage_print);
      REC_INTRO(__ham_copypage_read, 1);

      if ((ret = __ham_get_meta(dbc)) != 0)
            goto out;
      getmeta = 1;
      flags = 0;

      /* This is the bucket page. */
      if ((ret = memp_fget(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 donext;
            } else if ((ret = memp_fget(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);

      if (cmp_p == 0 && DB_REDO(op)) {
            /* Need to redo update described. */
            memcpy(pagep, argp->page.data, argp->page.size);
            PGNO(pagep) = argp->pgno;
            PREV_PGNO(pagep) = PGNO_INVALID;
            LSN(pagep) = *lsnp;
            flags = DB_MPOOL_DIRTY;
      } else if (cmp_n == 0 && DB_UNDO(op)) {
            /* Need to undo update described. */
            P_INIT(pagep, file_dbp->pgsize, argp->pgno, PGNO_INVALID,
                argp->next_pgno, 0, P_HASH);
            LSN(pagep) = argp->pagelsn;
            flags = DB_MPOOL_DIRTY;
      }
      if ((ret = memp_fput(mpf, pagep, flags)) != 0)
            goto out;

donext:     /* Now fix up the "next" page. */
      if ((ret = memp_fget(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.
                   */
                  ret = 0;
                  goto do_nn;
            } else if ((ret = memp_fget(mpf, &argp->next_pgno,
                DB_MPOOL_CREATE, &pagep)) != 0)
                  goto out;
      }

      /* For REDO just update the LSN. For UNDO copy page back. */
      cmp_n = log_compare(lsnp, &LSN(pagep));
      cmp_p = log_compare(&LSN(pagep), &argp->nextlsn);
      CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->nextlsn);
      flags = 0;
      if (cmp_p == 0 && DB_REDO(op)) {
            LSN(pagep) = *lsnp;
            flags = DB_MPOOL_DIRTY;
      } else if (cmp_n == 0 && DB_UNDO(op)) {
            /* Need to undo update described. */
            memcpy(pagep, argp->page.data, argp->page.size);
            flags = DB_MPOOL_DIRTY;
      }
      if ((ret = memp_fput(mpf, pagep, flags)) != 0)
            goto out;

      /* Now fix up the next's next page. */
do_nn:      if (argp->nnext_pgno == PGNO_INVALID)
            goto done;

      if ((ret = memp_fget(mpf, &argp->nnext_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 = memp_fget(mpf, &argp->nnext_pgno,
                DB_MPOOL_CREATE, &pagep)) != 0)
                  goto out;
      }

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

      flags = 0;
      if (cmp_p == 0 && DB_REDO(op)) {
            /* Need to redo update described. */
            PREV_PGNO(pagep) = argp->pgno;
            LSN(pagep) = *lsnp;
            flags = DB_MPOOL_DIRTY;
      } else if (cmp_n == 0 && DB_UNDO(op)) {
            /* Need to undo update described. */
            PREV_PGNO(pagep) = argp->next_pgno;
            LSN(pagep) = argp->nnextlsn;
            flags = DB_MPOOL_DIRTY;
      }
      if ((ret = memp_fput(mpf, pagep, flags)) != 0)
            goto out;

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

out:  if (getmeta)
            (void)__ham_release_meta(dbc);
      REC_CLOSE;
}

/*
 * __ham_metagroup_recover --
 *    Recovery function for metagroup.
 *
 * PUBLIC: int __ham_metagroup_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__ham_metagroup_recover(dbenv, dbtp, lsnp, op, info)
      DB_ENV *dbenv;
      DBT *dbtp;
      DB_LSN *lsnp;
      db_recops op;
      void *info;
{
      __ham_metagroup_args *argp;
      HASH_CURSOR *hcp;
      DB *file_dbp;
      DBC *dbc;
      DB_MPOOLFILE *mpf;
      PAGE *pagep;
      db_pgno_t last_pgno;
      int cmp_n, cmp_p, flags, groupgrow, ret;

      COMPQUIET(info, NULL);
      REC_PRINT(__ham_metagroup_print);
      REC_INTRO(__ham_metagroup_read, 1);

      /*
       * This logs the virtual create of pages pgno to pgno + bucket
       * Since the mpool page-allocation is not really able to be
       * transaction protected, we can never undo it.  Even in an abort,
       * we have to allocate these pages to the hash table.
       * The log record contains:
       * bucket: new bucket being allocated.
       * pgno: page number of the new bucket.
       * if bucket is a power of 2, then we allocated a whole batch of
       * pages; if it's not, then we simply allocated one new page.
       */
      groupgrow =
          (u_int32_t)(1 << __db_log2(argp->bucket + 1)) == argp->bucket + 1;

      last_pgno = argp->pgno;
      if (groupgrow)
            /* Read the last page. */
            last_pgno += argp->bucket;

      if ((ret = memp_fget(mpf, &last_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);

      flags = 0;
      if ((cmp_p == 0 && DB_REDO(op)) || (cmp_n == 0 && DB_UNDO(op))) {
            /*
             * We need to make sure that we redo the allocation of the
             * pages.
             */
            if (DB_REDO(op))
                  pagep->lsn = *lsnp;
            else
                  pagep->lsn = argp->pagelsn;
            flags = DB_MPOOL_DIRTY;
      }
      if ((ret = memp_fput(mpf, pagep, flags)) != 0)
            goto out;

      /* Now we have to update the meta-data page. */
      hcp = (HASH_CURSOR *)dbc->internal;
      if ((ret = __ham_get_meta(dbc)) != 0)
            goto out;
      cmp_n = log_compare(lsnp, &hcp->hdr->dbmeta.lsn);
      cmp_p = log_compare(&hcp->hdr->dbmeta.lsn, &argp->metalsn);
      CHECK_LSN(op, cmp_p, &hcp->hdr->dbmeta.lsn, &argp->metalsn);
      if ((cmp_p == 0 && DB_REDO(op)) || (cmp_n == 0 && DB_UNDO(op))) {
            if (DB_REDO(op)) {
                  /* Redo the actual updating of bucket counts. */
                  ++hcp->hdr->max_bucket;
                  if (groupgrow) {
                        hcp->hdr->low_mask = hcp->hdr->high_mask;
                        hcp->hdr->high_mask =
                            (argp->bucket + 1) | hcp->hdr->low_mask;
                  }
                  hcp->hdr->dbmeta.lsn = *lsnp;
            } else {
                  /* Undo the actual updating of bucket counts. */
                  --hcp->hdr->max_bucket;
                  if (groupgrow) {
                        hcp->hdr->high_mask = hcp->hdr->low_mask;
                        hcp->hdr->low_mask = hcp->hdr->high_mask >> 1;
                  }
                  hcp->hdr->dbmeta.lsn = argp->metalsn;
            }
            if (groupgrow &&
                hcp->hdr->spares[__db_log2(argp->bucket + 1) + 1] ==
                PGNO_INVALID)
                  hcp->hdr->spares[__db_log2(argp->bucket + 1) + 1] =
                      argp->pgno - argp->bucket - 1;
            F_SET(hcp, H_DIRTY);
      }
      if ((ret = __ham_release_meta(dbc)) != 0)
            goto out;

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

out:  REC_CLOSE;
}

/*
 * __ham_groupalloc_recover --
 *    Recover the batch creation of a set of pages for a new database.
 *
 * PUBLIC: int __ham_groupalloc_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__ham_groupalloc_recover(dbenv, dbtp, lsnp, op, info)
      DB_ENV *dbenv;
      DBT *dbtp;
      DB_LSN *lsnp;
      db_recops op;
      void *info;
{
      __ham_groupalloc_args *argp;
      DBMETA *mmeta;
      DB_MPOOLFILE *mpf;
      DB *file_dbp;
      DBC *dbc;
      db_pgno_t pgno;
      int cmp_n, cmp_p, flags, ret;

      REC_PRINT(__ham_groupalloc_print);
      REC_INTRO(__ham_groupalloc_read, 0);

      pgno = PGNO_BASE_MD;
      if ((ret = memp_fget(mpf, &pgno, 0, &mmeta)) != 0) {
            if (DB_REDO(op)) {
                  /* Page should have existed. */
                  (void)__db_pgerr(file_dbp, pgno);
                  goto out;
            } else {
                  ret = 0;
                  goto done;
            }
      }

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

      /*
       * Basically, we used mpool to allocate a chunk of pages.
       * We need to either add those to a free list (in the undo
       * case) or initialize them (in the redo case).
       *
       * If we are redoing and this is a hash subdatabase, it's possible
       * that the pages were never allocated, so we'd better check for
       * that and handle it here.
       */

      flags = 0;
      if (DB_REDO(op)) {
            if ((ret = __ham_alloc_pages(file_dbp, argp)) != 0)
                  goto out1;
            if (cmp_p == 0) {
                  LSN(mmeta) = *lsnp;
                  flags = DB_MPOOL_DIRTY;
            }
      }

      /*
       * Always put the pages into the limbo list and free them later.
       */
      else if (DB_UNDO(op)) {
            if ((ret = __db_add_limbo(dbenv,
                info, argp->fileid, argp->start_pgno, argp->num)) != 0)
                  goto out;
            if (cmp_n == 0) {
                  LSN(mmeta) = argp->meta_lsn;
                  flags = DB_MPOOL_DIRTY;
            }
      }

out1: if ((ret = memp_fput(mpf, mmeta, flags)) != 0)
            goto out;

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

out:  REC_CLOSE;
}

/*
 * __ham_alloc_pages --
 *
 * Called during redo of a file create.  We create new pages in the file
 * using the MPOOL_NEW_GROUP flag.  We then log the meta-data page with a
 * __crdel_metasub message.  If we manage to crash without the newly written
 * pages getting to disk (I'm not sure this can happen anywhere except our
 * test suite?!), then we need to go through a recreate the final pages.
 * Hash normally has holes in its files and handles them appropriately.
 */
static int
__ham_alloc_pages(dbp, argp)
      DB *dbp;
      __ham_groupalloc_args *argp;
{
      DB_MPOOLFILE *mpf;
      PAGE *pagep;
      db_pgno_t pgno;
      int ret;

      mpf = dbp->mpf;

      /* Read the last page of the allocation. */
      pgno = argp->start_pgno + argp->num - 1;

      /* If the page exists, and it has been initialized, then we're done. */
      if ((ret = memp_fget(mpf, &pgno, 0, &pagep)) == 0) {
            if ((pagep->type == P_INVALID) && IS_ZERO_LSN(pagep->lsn))
                  goto reinit_page;
            if ((ret = memp_fput(mpf, pagep, 0)) != 0)
                  return (ret);
            return (0);
      }

      /*
       * Had to create the page.  On some systems (read "Windows"),
       * you can find random garbage on pages to which you haven't
       * yet written.  So, we have an os layer that will do the
       * right thing for group allocations.  We call that directly
       * to make sure all the pages are allocated and then continue
       * merrily on our way with normal recovery.
       */
      if ((ret = __os_fpinit(dbp->dbenv, &mpf->fh,
          argp->start_pgno, argp->num, dbp->pgsize)) != 0)
            return (ret);

      if ((ret = memp_fget(mpf, &pgno, DB_MPOOL_CREATE, &pagep)) != 0) {
            (void)__db_pgerr(dbp, pgno);
            return (ret);
      }

reinit_page:
      /* Initialize the newly allocated page. */
      P_INIT(pagep,
          dbp->pgsize, pgno, PGNO_INVALID, PGNO_INVALID, 0, P_HASH);
      ZERO_LSN(pagep->lsn);

      if ((ret = memp_fput(mpf, pagep, DB_MPOOL_DIRTY)) != 0)
            return (ret);

      return (0);
}

/*
 * __ham_curadj_recover --
 *    Undo cursor adjustments if a subtransaction fails.
 *
 * PUBLIC: int __ham_curadj_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */

int
__ham_curadj_recover(dbenv, dbtp, lsnp, op, info)
      DB_ENV *dbenv;
      DBT *dbtp;
      DB_LSN *lsnp;
      db_recops op;
      void *info;
{
      __ham_curadj_args *argp;
      DB_MPOOLFILE *mpf;
      DB *file_dbp;
      DBC *dbc;
      int ret;
      HASH_CURSOR *hcp;

      REC_PRINT(__ham_groupalloc_print);

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

      COMPQUIET(info, NULL);
      /*
       * Undo the adjustment by reinitializing the the cursor
       * to look like the one that was used to do the adustment,
       * then we invert the add so that undo the adjustment.
       */
      hcp = (HASH_CURSOR *)dbc->internal;
      hcp->pgno = argp->pgno;
      hcp->indx = argp->indx;
      hcp->dup_off = argp->dup_off;
      hcp->order = argp->order;
      if (!argp->add)
            F_SET(hcp, H_DELETED);
      (void)__ham_c_update(dbc, argp->len, !argp->add, argp->is_dup);

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

/*
 * __ham_chgpg_recover --
 *    Undo cursor adjustments if a subtransaction fails.
 *
 * PUBLIC: int __ham_chgpg_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */

int
__ham_chgpg_recover(dbenv, dbtp, lsnp, op, info)
      DB_ENV *dbenv;
      DBT *dbtp;
      DB_LSN *lsnp;
      db_recops op;
      void *info;
{
      __ham_chgpg_args *argp;
      BTREE_CURSOR *opdcp;
      DB_MPOOLFILE *mpf;
      DB *file_dbp, *ldbp;
      DBC *dbc;
      int ret;
      DBC *cp;
      HASH_CURSOR *lcp;

      REC_PRINT(__ham_chgpg_print);

      ret = 0;
      if (op != DB_TXN_ABORT)
            goto out;
      REC_INTRO(__ham_chgpg_read, 0);

      COMPQUIET(info, NULL);

      MUTEX_THREAD_LOCK(dbenv, dbenv->dblist_mutexp);
      for (ldbp = __dblist_get(dbenv, file_dbp->adj_fileid);
          ldbp != NULL && ldbp->adj_fileid == file_dbp->adj_fileid;
          ldbp = LIST_NEXT(ldbp, dblistlinks)) {
            MUTEX_THREAD_LOCK(dbenv, file_dbp->mutexp);

            for (cp = TAILQ_FIRST(&ldbp->active_queue); cp != NULL;
                cp = TAILQ_NEXT(cp, links)) {
                  lcp = (HASH_CURSOR *)cp->internal;

                  switch (argp->mode) {
                  case DB_HAM_CHGPG:
                        if (lcp->pgno != argp->new_pgno)
                              break;

                        if (argp->old_indx == NDX_INVALID)
                              lcp->pgno = argp->old_pgno;
                        else if (lcp->indx == argp->new_indx) {
                              lcp->indx = argp->old_indx;
                              lcp->pgno = argp->old_pgno;
                        }
                        break;

                  case DB_HAM_SPLIT:
                        if (lcp->pgno == argp->new_pgno
                             && lcp->indx == argp->new_indx) {
                              lcp->indx = argp->old_indx;
                              lcp->pgno = argp->old_pgno;
                        }
                        break;

                  case DB_HAM_DUP:
                        if (lcp->opd != NULL) {
                              opdcp =
                                  (BTREE_CURSOR *)lcp->opd->internal;
                              if (opdcp->pgno == argp->new_pgno &&
                                   opdcp->indx == argp->new_indx) {
                                    if (F_ISSET(opdcp, C_DELETED))
                                          F_SET(lcp, H_DELETED);
                                    if ((ret =
                                        lcp->opd->c_close(
                                        lcp->opd)) != 0)
                                          goto out;
                                    lcp->opd = NULL;
                              }
                        }
                        break;
                  }
            }

            MUTEX_THREAD_UNLOCK(dbenv, file_dbp->mutexp);
      }
      MUTEX_THREAD_UNLOCK(dbenv, dbenv->dblist_mutexp);

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

Generated by  Doxygen 1.6.0   Back to index