lib/libc/db/recno/rec_close.c

   1 /*-
   2  * Copyright (c) 1990, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)rec_close.c      8.6 (Berkeley) 8/18/94
  30  * $FreeBSD: src/lib/libc/db/recno/rec_close.c,v 1.4 2000/01/27 23:06:11 jasone Exp $
  31  * $DragonFly: src/lib/libc/db/recno/rec_close.c,v 1.6 2005/11/19 20:46:32 swildner Exp $
  32  */
  33
  34 #include "namespace.h"
  35 #include <sys/types.h>
  36 #include <sys/uio.h>
  37 #include <sys/mman.h>
  38
  39 #include <errno.h>
  40 #include <limits.h>
  41 #include <stdio.h>
  42 #include <unistd.h>
  43 #include "un-namespace.h"
  44
  45 #include <db.h>
  46 #include "recno.h"
  47
  48 /*
  49  * __REC_CLOSE -- Close a recno tree.
  50  *
  51  * Parameters:
  52  *      dbp:    pointer to access method
  53  *
  54  * Returns:
  55  *      RET_ERROR, RET_SUCCESS
  56  */
  57 int
  58 __rec_close(DB *dbp)
  59 {
  60         BTREE *t;
  61         int status;
  62
  63         t = dbp->internal;
  64
  65         /* Toss any page pinned across calls. */
  66         if (t->bt_pinned != NULL) {
  67                 mpool_put(t->bt_mp, t->bt_pinned, 0);
  68                 t->bt_pinned = NULL;
  69         }
  70
  71         if (__rec_sync(dbp, 0) == RET_ERROR)
  72                 return (RET_ERROR);
  73
  74         /* Committed to closing. */
  75         status = RET_SUCCESS;
  76         if (F_ISSET(t, R_MEMMAPPED) && munmap(t->bt_smap, t->bt_msize))
  77                 status = RET_ERROR;
  78
  79         if (!F_ISSET(t, R_INMEM)) {
  80                 if (F_ISSET(t, R_CLOSEFP)) {
  81                         if (fclose(t->bt_rfp))
  82                                 status = RET_ERROR;
  83                 } else
  84                         if (_close(t->bt_rfd))
  85                                 status = RET_ERROR;
  86         }
  87
  88         if (__bt_close(dbp) == RET_ERROR)
  89                 status = RET_ERROR;
  90
  91         return (status);
  92 }
  93
  94 /*
  95  * __REC_SYNC -- sync the recno tree to disk.
  96  *
  97  * Parameters:
  98  *      dbp:    pointer to access method
  99  *
 100  * Returns:
 101  *      RET_SUCCESS, RET_ERROR.
 102  */
 103 int
 104 __rec_sync(const DB *dbp, u_int flags)
 105 {
 106         struct iovec iov[2];
 107         BTREE *t;
 108         DBT data, key;
 109         off_t off;
 110         recno_t scursor, trec;
 111         int status;
 112
 113         t = dbp->internal;
 114
 115         /* Toss any page pinned across calls. */
 116         if (t->bt_pinned != NULL) {
 117                 mpool_put(t->bt_mp, t->bt_pinned, 0);
 118                 t->bt_pinned = NULL;
 119         }
 120
 121         if (flags == R_RECNOSYNC)
 122                 return (__bt_sync(dbp, 0));
 123
 124         if (F_ISSET(t, R_RDONLY | R_INMEM) || !F_ISSET(t, R_MODIFIED))
 125                 return (RET_SUCCESS);
 126
 127         /* Read any remaining records into the tree. */
 128         if (!F_ISSET(t, R_EOF) && t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR)
 129                 return (RET_ERROR);
 130
 131         /* Rewind the file descriptor. */
 132         if (lseek(t->bt_rfd, (off_t)0, SEEK_SET) != 0)
 133                 return (RET_ERROR);
 134
 135         /* Save the cursor. */
 136         scursor = t->bt_cursor.rcursor;
 137
 138         key.size = sizeof(recno_t);
 139         key.data = &trec;
 140
 141         if (F_ISSET(t, R_FIXLEN)) {
 142                 /*
 143                  * We assume that fixed length records are all fixed length.
 144                  * Any that aren't are either EINVAL'd or corrected by the
 145                  * record put code.
 146                  */
 147                 status = (dbp->seq)(dbp, &key, &data, R_FIRST);
 148                 while (status == RET_SUCCESS) {
 149                         if (_write(t->bt_rfd, data.data, data.size) !=
 150                             data.size)
 151                                 return (RET_ERROR);
 152                         status = (dbp->seq)(dbp, &key, &data, R_NEXT);
 153                 }
 154         } else {
 155                 iov[1].iov_base = (char *)&t->bt_bval;
 156                 iov[1].iov_len = 1;
 157
 158                 status = (dbp->seq)(dbp, &key, &data, R_FIRST);
 159                 while (status == RET_SUCCESS) {
 160                         iov[0].iov_base = data.data;
 161                         iov[0].iov_len = data.size;
 162                         if (_writev(t->bt_rfd, iov, 2) != data.size + 1)
 163                                 return (RET_ERROR);
 164                         status = (dbp->seq)(dbp, &key, &data, R_NEXT);
 165                 }
 166         }
 167
 168         /* Restore the cursor. */
 169         t->bt_cursor.rcursor = scursor;
 170
 171         if (status == RET_ERROR)
 172                 return (RET_ERROR);
 173         if ((off = lseek(t->bt_rfd, (off_t)0, SEEK_CUR)) == -1)
 174                 return (RET_ERROR);
 175         if (ftruncate(t->bt_rfd, off))
 176                 return (RET_ERROR);
 177         F_CLR(t, R_MODIFIED);
 178         return (RET_SUCCESS);
 179 }