db/recno/FreeBSD/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  * 4. 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
  30 #if defined(LIBC_SCCS) && !defined(lint)
  31 static char sccsid[] = "@(#)rec_close.c 8.6 (Berkeley) 8/18/94";
  32 #endif /* LIBC_SCCS and not lint */
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD: src/lib/libc/db/recno/rec_close.c,v 1.11 2009/03/28 05:45:29 delphij Exp $");
  35
  36 #include "namespace.h"
  37 #include <sys/types.h>
  38 #include <sys/uio.h>
  39 #include <sys/mman.h>
  40
  41 #include <errno.h>
  42 #include <limits.h>
  43 #include <stdio.h>
  44 #include <unistd.h>
  45 #include "un-namespace.h"
  46
  47 #include <db.h>
  48 #include "recno.h"
  49
  50 /*
  51  * __REC_CLOSE -- Close a recno tree.
  52  *
  53  * Parameters:
  54  *      dbp:    pointer to access method
  55  *
  56  * Returns:
  57  *      RET_ERROR, RET_SUCCESS
  58  */
  59 int
  60 __rec_close(DB *dbp)
  61 {
  62         BTREE *t;
  63         int status;
  64
  65         t = dbp->internal;
  66
  67         /* Toss any page pinned across calls. */
  68         if (t->bt_pinned != NULL) {
  69                 mpool_put(t->bt_mp, t->bt_pinned, 0);
  70                 t->bt_pinned = NULL;
  71         }
  72
  73         if (__rec_sync(dbp, 0) == RET_ERROR)
  74                 return (RET_ERROR);
  75
  76         /* Committed to closing. */
  77         status = RET_SUCCESS;
  78         if (F_ISSET(t, R_MEMMAPPED) && munmap(t->bt_smap, t->bt_msize))
  79                 status = RET_ERROR;
  80
  81         if (!F_ISSET(t, R_INMEM)) {
  82                 if (F_ISSET(t, R_CLOSEFP)) {
  83                         if (fclose(t->bt_rfp))
  84                                 status = RET_ERROR;
  85                 } else {
  86                         if (_close(t->bt_rfd))
  87                                 status = RET_ERROR;
  88                 }
  89         }
  90
  91         if (__bt_close(dbp) == RET_ERROR)
  92                 status = RET_ERROR;
  93
  94         return (status);
  95 }
  96
  97 /*
  98  * __REC_SYNC -- sync the recno tree to disk.
  99  *
 100  * Parameters:
 101  *      dbp:    pointer to access method
 102  *
 103  * Returns:
 104  *      RET_SUCCESS, RET_ERROR.
 105  */
 106 int
 107 __rec_sync(const DB *dbp, u_int flags)
 108 {
 109         struct iovec iov[2];
 110         BTREE *t;
 111         DBT data, key;
 112         off_t off;
 113         recno_t scursor, trec;
 114         int status;
 115
 116         t = dbp->internal;
 117
 118         /* Toss any page pinned across calls. */
 119         if (t->bt_pinned != NULL) {
 120                 mpool_put(t->bt_mp, t->bt_pinned, 0);
 121                 t->bt_pinned = NULL;
 122         }
 123
 124         if (flags == R_RECNOSYNC)
 125                 return (__bt_sync(dbp, 0));
 126
 127         if (F_ISSET(t, R_RDONLY | R_INMEM) || !F_ISSET(t, R_MODIFIED))
 128                 return (RET_SUCCESS);
 129
 130         /* Read any remaining records into the tree. */
 131         if (!F_ISSET(t, R_EOF) && t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR)
 132                 return (RET_ERROR);
 133
 134         /* Rewind the file descriptor. */
 135         if (lseek(t->bt_rfd, (off_t)0, SEEK_SET) != 0)
 136                 return (RET_ERROR);
 137
 138         /* Save the cursor. */
 139         scursor = t->bt_cursor.rcursor;
 140
 141         key.size = sizeof(recno_t);
 142         key.data = &trec;
 143
 144         if (F_ISSET(t, R_FIXLEN)) {
 145                 /*
 146                  * We assume that fixed length records are all fixed length.
 147                  * Any that aren't are either EINVAL'd or corrected by the
 148                  * record put code.
 149                  */
 150                 status = (dbp->seq)(dbp, &key, &data, R_FIRST);
 151                 while (status == RET_SUCCESS) {
 152                         if (_write(t->bt_rfd, data.data, data.size) !=
 153                             (ssize_t)data.size)
 154                                 return (RET_ERROR);
 155                         status = (dbp->seq)(dbp, &key, &data, R_NEXT);
 156                 }
 157         } else {
 158                 iov[1].iov_base = &t->bt_bval;
 159                 iov[1].iov_len = 1;
 160
 161                 status = (dbp->seq)(dbp, &key, &data, R_FIRST);
 162                 while (status == RET_SUCCESS) {
 163                         iov[0].iov_base = data.data;
 164                         iov[0].iov_len = data.size;
 165                         if (_writev(t->bt_rfd, iov, 2) != (ssize_t)(data.size + 1))
 166                                 return (RET_ERROR);
 167                         status = (dbp->seq)(dbp, &key, &data, R_NEXT);
 168                 }
 169         }
 170
 171         /* Restore the cursor. */
 172         t->bt_cursor.rcursor = scursor;
 173
 174         if (status == RET_ERROR)
 175                 return (RET_ERROR);
 176         if ((off = lseek(t->bt_rfd, (off_t)0, SEEK_CUR)) == -1)
 177                 return (RET_ERROR);
 178         if (ftruncate(t->bt_rfd, off))
 179                 return (RET_ERROR);
 180         F_CLR(t, R_MODIFIED);
 181         return (RET_SUCCESS);
 182 }