rec_close.c

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/*-
 * Copyright (c) 1990, 1993, 1994
 * The Regents of the University of California.  All rights reserved.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 * This product includes software developed by the University of
 * California, Berkeley and its contributors.
 * 4. 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)rec_close.c   8.6 (Berkeley) 8/18/94";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/uio.h>
#include <sys/mman.h>

#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <unistd.h>

#include "../include/db.h"
#include "recno.h"

/*
 * __REC_CLOSE -- Close a recno tree.
 *
 * Parameters:
 * dbp:  pointer to access method
 *
 * Returns:
 * RET_ERROR, RET_SUCCESS
 */
int
__rec_close(dbp)
   DB *dbp;
{
   BTREE *t;
   int status;

   t = dbp->internal;

   /* Toss any page pinned across calls. */
   if (t->bt_pinned != NULL) {
      mpool_put(t->bt_mp, t->bt_pinned, 0);
      t->bt_pinned = NULL;
   }

   if (__rec_sync(dbp, 0) == RET_ERROR)
      return (RET_ERROR);

   /* Committed to closing. */
   status = RET_SUCCESS;
   if (F_ISSET(t, R_MEMMAPPED) && munmap(t->bt_smap, t->bt_msize))
      status = RET_ERROR;

   if (!F_ISSET(t, R_INMEM)) {
      if (F_ISSET(t, R_CLOSEFP)) {
         if (fclose(t->bt_rfp))
            status = RET_ERROR;
      } else
         if (close(t->bt_rfd))
            status = RET_ERROR;
   }

   if (__bt_close(dbp) == RET_ERROR)
      status = RET_ERROR;

   return (status);
}

/*
 * __REC_SYNC -- sync the recno tree to disk.
 *
 * Parameters:
 * dbp:  pointer to access method
 *
 * Returns:
 * RET_SUCCESS, RET_ERROR.
 */
int
__rec_sync(dbp, flags)
   const DB *dbp;
   u_int flags;
{
   struct iovec iov[2];
   BTREE *t;
   DBT data, key;
   off_t off;
   recno_t scursor, trec;
   int status;

   t = dbp->internal;

   /* Toss any page pinned across calls. */
   if (t->bt_pinned != NULL) {
      mpool_put(t->bt_mp, t->bt_pinned, 0);
      t->bt_pinned = NULL;
   }

   if (flags == R_RECNOSYNC)
      return (__bt_sync(dbp, 0));

   if (F_ISSET(t, R_RDONLY | R_INMEM) || !F_ISSET(t, R_MODIFIED))
      return (RET_SUCCESS);

   /* Read any remaining records into the tree. */
   if (!F_ISSET(t, R_EOF) && t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR)
      return (RET_ERROR);

   /* Rewind the file descriptor. */
   if (lseek(t->bt_rfd, (off_t)0, SEEK_SET) != 0)
      return (RET_ERROR);

   /* Save the cursor. */
   scursor = t->bt_cursor.rcursor;

   key.size = sizeof(recno_t);
   key.data = &trec;

   if (F_ISSET(t, R_FIXLEN)) {
      /*
       * We assume that fixed length records are all fixed length.
       * Any that aren't are either EINVAL'd or corrected by the
       * record put code.
       */
      status = (dbp->seq)(dbp, &key, &data, R_FIRST);
      while (status == RET_SUCCESS) {
         if ((size_t) write(t->bt_rfd, data.data, data.size) != data.size)
            return (RET_ERROR);
         status = (dbp->seq)(dbp, &key, &data, R_NEXT);
      }
   } else {
      iov[1].iov_base = &t->bt_bval;
      iov[1].iov_len = 1;

      status = (dbp->seq)(dbp, &key, &data, R_FIRST);
      while (status == RET_SUCCESS) {
         iov[0].iov_base = data.data;
         iov[0].iov_len = data.size;
         if ((size_t) writev(t->bt_rfd, iov, 2) != data.size + 1)
            return (RET_ERROR);
         status = (dbp->seq)(dbp, &key, &data, R_NEXT);
      }
   }

   /* Restore the cursor. */
   t->bt_cursor.rcursor = scursor;

   if (status == RET_ERROR)
      return (RET_ERROR);
   if ((off = lseek(t->bt_rfd, (off_t)0, SEEK_CUR)) == -1)
      return (RET_ERROR);
   if (ftruncate(t->bt_rfd, off))
      return (RET_ERROR);
   F_CLR(t, R_MODIFIED);
   return (RET_SUCCESS);
}