db/btree/FreeBSD/bt_close.c

   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  * 4. 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 #include <sys/cdefs.h>
  37 __FBSDID("$FreeBSD: src/lib/libc/db/btree/bt_close.c,v 1.10 2009/03/02 23:47:18 delphij Exp $");
  38
  39 #include "namespace.h"
  40 #include <sys/param.h>
  41
  42 #include <errno.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47 #include "un-namespace.h"
  48
  49 #include <db.h>
  50 #include "btree.h"
  51
  52 static int bt_meta(BTREE *);
  53
  54 /*
  55  * BT_CLOSE -- Close a btree.
  56  *
  57  * Parameters:
  58  *      dbp:    pointer to access method
  59  *
  60  * Returns:
  61  *      RET_ERROR, RET_SUCCESS
  62  */
  63 int
  64 __bt_close(DB *dbp)
  65 {
  66         BTREE *t;
  67         int fd;
  68
  69         t = dbp->internal;
  70
  71         /* Toss any page pinned across calls. */
  72         if (t->bt_pinned != NULL) {
  73                 mpool_put(t->bt_mp, t->bt_pinned, 0);
  74                 t->bt_pinned = NULL;
  75         }
  76
  77         /* Sync the tree. */
  78         if (__bt_sync(dbp, 0) == RET_ERROR)
  79                 return (RET_ERROR);
  80
  81         /* Close the memory pool. */
  82         if (mpool_close(t->bt_mp) == RET_ERROR)
  83                 return (RET_ERROR);
  84
  85         /* Free random memory. */
  86         if (t->bt_cursor.key.data != NULL) {
  87                 free(t->bt_cursor.key.data);
  88                 t->bt_cursor.key.size = 0;
  89                 t->bt_cursor.key.data = NULL;
  90         }
  91         if (t->bt_rkey.data) {
  92                 free(t->bt_rkey.data);
  93                 t->bt_rkey.size = 0;
  94                 t->bt_rkey.data = NULL;
  95         }
  96         if (t->bt_rdata.data) {
  97                 free(t->bt_rdata.data);
  98                 t->bt_rdata.size = 0;
  99                 t->bt_rdata.data = NULL;
 100         }
 101
 102         fd = t->bt_fd;
 103         free(t);
 104         free(dbp);
 105         return (_close(fd) ? RET_ERROR : RET_SUCCESS);
 106 }
 107
 108 /*
 109  * BT_SYNC -- sync the btree to disk.
 110  *
 111  * Parameters:
 112  *      dbp:    pointer to access method
 113  *
 114  * Returns:
 115  *      RET_SUCCESS, RET_ERROR.
 116  */
 117 int
 118 __bt_sync(const DB *dbp, u_int flags)
 119 {
 120         BTREE *t;
 121         int status;
 122
 123         t = dbp->internal;
 124
 125         /* Toss any page pinned across calls. */
 126         if (t->bt_pinned != NULL) {
 127                 mpool_put(t->bt_mp, t->bt_pinned, 0);
 128                 t->bt_pinned = NULL;
 129         }
 130
 131         /* Sync doesn't currently take any flags. */
 132         if (flags != 0) {
 133                 errno = EINVAL;
 134                 return (RET_ERROR);
 135         }
 136
 137         if (F_ISSET(t, B_INMEM | B_RDONLY) || !F_ISSET(t, B_MODIFIED))
 138                 return (RET_SUCCESS);
 139
 140         if (F_ISSET(t, B_METADIRTY) && bt_meta(t) == RET_ERROR)
 141                 return (RET_ERROR);
 142
 143         if ((status = mpool_sync(t->bt_mp)) == RET_SUCCESS)
 144                 F_CLR(t, B_MODIFIED);
 145
 146         return (status);
 147 }
 148
 149 /*
 150  * BT_META -- write the tree meta data to disk.
 151  *
 152  * Parameters:
 153  *      t:      tree
 154  *
 155  * Returns:
 156  *      RET_ERROR, RET_SUCCESS
 157  */
 158 static int
 159 bt_meta(BTREE *t)
 160 {
 161         BTMETA m;
 162         void *p;
 163
 164         if ((p = mpool_get(t->bt_mp, P_META, 0)) == NULL)
 165                 return (RET_ERROR);
 166
 167         /* Fill in metadata. */
 168         m.magic = BTREEMAGIC;
 169         m.version = BTREEVERSION;
 170         m.psize = t->bt_psize;
 171         m.free = t->bt_free;
 172         m.nrecs = t->bt_nrecs;
 173         m.flags = F_ISSET(t, SAVEMETA);
 174
 175         memmove(p, &m, sizeof(BTMETA));
 176         mpool_put(t->bt_mp, p, MPOOL_DIRTY);
 177         return (RET_SUCCESS);
 178 }