libdb/bt_close.c

libdb/bt_close.c
/* */
This source file includes following definitions.
__bt_close
__bt_sync
bt_meta
   1 /*-
   2  * Copyright (c) 1990, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Mike Olson.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32 
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 static char sccsid[] = "@(#)bt_close.c  8.7 (Berkeley) 8/17/94";
  35 #endif /* LIBC_SCCS and not lint */
  36 
  37 #ifdef HAVE_CONFIG_H
  38 #include <config.h>
  39 #endif
  40 #include <errno.h>
  41 #include <stdio.h>
  42 #ifdef STDC_HEADERS
  43 #include <stdlib.h>
  44 #endif
  45 #ifdef HAVE_STRING_H
  46 #include <string.h>
  47 #else
  48 #include <strings.h>
  49 #endif
  50 #ifdef HAVE_UNISTD_H
  51 #include <unistd.h>
  52 #endif
  53 
  54 #include "db.h"
  55 #include "btree.h"
  56 
  57 static int bt_meta(BTREE *);
  58 
  59 /**
  60  * BT_CLOSE -- Close a btree.
  61  *
  62  *      @param dbp      pointer to access method
  63  *      @param abandon  1: don't sync, 0: sync
  64  *
  65  * @return #RET_ERROR, #RET_SUCCESS
  66  */
  67 int
  68 __bt_close(dbp, abandon)
  69         DB *dbp;
  70         int abandon;
  71 {
  72         BTREE *t;
  73         int fd;
  74 
  75         t = dbp->internal;
  76 
  77         /* Toss any page pinned across calls. */
  78         if (t->bt_pinned != NULL) {
  79                 mpool_put(t->bt_mp, t->bt_pinned, 0);
  80                 t->bt_pinned = NULL;
  81         }
  82 
  83         /* Sync the tree. */
  84         /*
  85          * If abandon flag is set, omit writing to the disk.
  86          * Since the writing spend much time, you should use this flag
  87          * when you remove the file after closing.
  88          */
  89         if (!abandon && __bt_sync(dbp, 0) == RET_ERROR)
  90                 return (RET_ERROR);
  91 
  92         /* Close the memory pool. */
  93         if (mpool_close(t->bt_mp) == RET_ERROR)
  94                 return (RET_ERROR);
  95 
  96         /* Free random memory. */
  97         if (t->bt_cursor.key.data != NULL) {
  98                 free(t->bt_cursor.key.data);
  99                 t->bt_cursor.key.size = 0;
 100                 t->bt_cursor.key.data = NULL;
 101         }
 102         if (t->bt_rkey.data) {
 103                 free(t->bt_rkey.data);
 104                 t->bt_rkey.size = 0;
 105                 t->bt_rkey.data = NULL;
 106         }
 107         if (t->bt_rdata.data) {
 108                 free(t->bt_rdata.data);
 109                 t->bt_rdata.size = 0;
 110                 t->bt_rdata.data = NULL;
 111         }
 112 
 113         fd = t->bt_fd;
 114         free(t);
 115         free(dbp);
 116         return (close(fd) ? RET_ERROR : RET_SUCCESS);
 117 }
 118 
 119 /**
 120  * BT_SYNC -- sync the btree to disk.
 121  *
 122  *      @param dbp      pointer to access method
 123  *      @param flags
 124  *
 125  * @return #RET_SUCCESS, #RET_ERROR.
 126  */
 127 int
 128 __bt_sync(dbp, flags)
 129         const DB *dbp;
 130         u_int flags;
 131 {
 132         BTREE *t;
 133         int status;
 134 
 135         t = dbp->internal;
 136 
 137         /* Toss any page pinned across calls. */
 138         if (t->bt_pinned != NULL) {
 139                 mpool_put(t->bt_mp, t->bt_pinned, 0);
 140                 t->bt_pinned = NULL;
 141         }
 142 
 143         /* Sync doesn't currently take any flags. */
 144         if (flags != 0) {
 145                 errno = EINVAL;
 146                 return (RET_ERROR);
 147         }
 148 
 149         if (F_ISSET(t, B_INMEM | B_RDONLY) || !F_ISSET(t, B_MODIFIED))
 150                 return (RET_SUCCESS);
 151 
 152         if (F_ISSET(t, B_METADIRTY) && bt_meta(t) == RET_ERROR)
 153                 return (RET_ERROR);
 154 
 155         if ((status = mpool_sync(t->bt_mp)) == RET_SUCCESS)
 156                 F_CLR(t, B_MODIFIED);
 157 
 158         return (status);
 159 }
 160 
 161 /**
 162  * BT_META -- write the tree meta data to disk.
 163  *
 164  *      @param t        tree
 165  *
 166  * @return #RET_ERROR, #RET_SUCCESS
 167  */
 168 static int
 169 bt_meta(t)
 170         BTREE *t;
 171 {
 172         BTMETA m;
 173         void *p;
 174 
 175         if ((p = mpool_get(t->bt_mp, P_META, 0)) == NULL)
 176                 return (RET_ERROR);
 177 
 178         /* Fill in metadata. */
 179         m.magic = BTREEMAGIC;
 180         m.version = BTREEVERSION;
 181         m.psize = t->bt_psize;
 182         m.free = t->bt_free;
 183         m.nrecs = t->bt_nrecs;
 184         m.flags = F_ISSET(t, SAVEMETA);
 185 
 186         memmove(p, &m, sizeof(BTMETA));
 187         mpool_put(t->bt_mp, p, MPOOL_DIRTY);
 188         return (RET_SUCCESS);
 189 }
/* */
root/libdb/bt_close.c

DEFINITIONS
