lib/libc/db/recno/rec_close.c

   1 /*      $NetBSD: rec_close.c,v 1.15 2008/09/11 12:58:00 joerg Exp $     */
   2
   3 /*-
   4  * Copyright (c) 1990, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #if HAVE_NBTOOL_CONFIG_H
  33 #include "nbtool_config.h"
  34 #endif
  35
  36 #include <sys/cdefs.h>
  37 __RCSID("$NetBSD: rec_close.c,v 1.15 2008/09/11 12:58:00 joerg Exp $");
  38
  39 #include "namespace.h"
  40 #include <sys/types.h>
  41 #include <sys/uio.h>
  42 #include <sys/mman.h>
  43
  44 #include <assert.h>
  45 #include <errno.h>
  46 #include <limits.h>
  47 #include <stdio.h>
  48 #include <unistd.h>
  49
  50 #include <db.h>
  51 #include "recno.h"
  52
  53 /*
  54  * __REC_CLOSE -- Close a recno tree.
  55  *
  56  * Parameters:
  57  *      dbp:    pointer to access method
  58  *
  59  * Returns:
  60  *      RET_ERROR, RET_SUCCESS
  61  */
  62 int
  63 __rec_close(DB *dbp)
  64 {
  65         BTREE *t;
  66         int status;
  67
  68         t = dbp->internal;
  69
  70         /* Toss any page pinned across calls. */
  71         if (t->bt_pinned != NULL) {
  72                 mpool_put(t->bt_mp, t->bt_pinned, 0);
  73                 t->bt_pinned = NULL;
  74         }
  75
  76         if (__rec_sync(dbp, 0) == RET_ERROR)
  77                 return (RET_ERROR);
  78
  79         /* Committed to closing. */
  80         status = RET_SUCCESS;
  81         if (F_ISSET(t, R_MEMMAPPED) && munmap(t->bt_smap, t->bt_msize))
  82                 status = RET_ERROR;
  83
  84         if (!F_ISSET(t, R_INMEM)) {
  85                 if (F_ISSET(t, R_CLOSEFP)) {
  86                         if (fclose(t->bt_rfp))
  87                                 status = RET_ERROR;
  88                 } else {
  89                         if (close(t->bt_rfd))
  90                                 status = RET_ERROR;
  91                 }
  92         }
  93
  94         if (__bt_close(dbp) == RET_ERROR)
  95                 status = RET_ERROR;
  96
  97         return (status);
  98 }
  99
 100 /*
 101  * __REC_SYNC -- sync the recno tree to disk.
 102  *
 103  * Parameters:
 104  *      dbp:    pointer to access method
 105  *
 106  * Returns:
 107  *      RET_SUCCESS, RET_ERROR.
 108  */
 109 int
 110 __rec_sync(const DB *dbp, u_int flags)
 111 {
 112         struct iovec iov[2];
 113         BTREE *t;
 114         DBT data, key;
 115         off_t off;
 116         recno_t scursor, trec;
 117         int status;
 118
 119         t = dbp->internal;
 120
 121         /* Toss any page pinned across calls. */
 122         if (t->bt_pinned != NULL) {
 123                 mpool_put(t->bt_mp, t->bt_pinned, 0);
 124                 t->bt_pinned = NULL;
 125         }
 126
 127         if (flags == R_RECNOSYNC)
 128                 return (__bt_sync(dbp, 0));
 129
 130         if (F_ISSET(t, R_RDONLY | R_INMEM) || !F_ISSET(t, R_MODIFIED))
 131                 return (RET_SUCCESS);
 132
 133         /* Read any remaining records into the tree. */
 134         if (!F_ISSET(t, R_EOF) && t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR)
 135                 return (RET_ERROR);
 136
 137         /* Rewind the file descriptor. */
 138         if (lseek(t->bt_rfd, (off_t)0, SEEK_SET) != 0)
 139                 return (RET_ERROR);
 140
 141         /* Save the cursor. */
 142         scursor = t->bt_cursor.rcursor;
 143
 144         key.size = sizeof(recno_t);
 145         key.data = &trec;
 146
 147         if (F_ISSET(t, R_FIXLEN)) {
 148                 /*
 149                  * We assume that fixed length records are all fixed length.
 150                  * Any that aren't are either EINVAL'd or corrected by the
 151                  * record put code.
 152                  */
 153                 status = (dbp->seq)(dbp, &key, &data, R_FIRST);
 154                 while (status == RET_SUCCESS) {
 155                         if (write(t->bt_rfd, data.data, data.size) !=
 156                             (ssize_t) data.size)
 157                                 return (RET_ERROR);
 158                         status = (dbp->seq)(dbp, &key, &data, R_NEXT);
 159                 }
 160         } else {
 161                 iov[1].iov_base = &t->bt_bval;
 162                 iov[1].iov_len = 1;
 163
 164                 status = (dbp->seq)(dbp, &key, &data, R_FIRST);
 165                 while (status == RET_SUCCESS) {
 166                         iov[0].iov_base = data.data;
 167                         iov[0].iov_len = data.size;
 168                         if (writev(t->bt_rfd, iov, 2) !=
 169                             (ssize_t) (data.size + 1))
 170                                 return (RET_ERROR);
 171                         status = (dbp->seq)(dbp, &key, &data, R_NEXT);
 172                 }
 173         }
 174
 175         /* Restore the cursor. */
 176         t->bt_cursor.rcursor = scursor;
 177
 178         if (status == RET_ERROR)
 179                 return (RET_ERROR);
 180         if ((off = lseek(t->bt_rfd, (off_t)0, SEEK_CUR)) == -1)
 181                 return (RET_ERROR);
 182         if (ftruncate(t->bt_rfd, off))
 183                 return (RET_ERROR);
 184         F_CLR(t, R_MODIFIED);
 185         return (RET_SUCCESS);
 186 }