1/* $NetBSD: bt_close.c,v 1.13 2008/09/10 17:52:35 joerg Exp $ */ 2 3/*- 4 * Copyright (c) 1990, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Mike Olson. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35#if HAVE_NBTOOL_CONFIG_H 36#include "nbtool_config.h" 37#endif 38 39#include <sys/cdefs.h> 40__RCSID("$NetBSD: bt_close.c,v 1.13 2008/09/10 17:52:35 joerg Exp $"); 41 42#include "namespace.h" 43 44#include <assert.h> 45#include <errno.h> 46#include <stdio.h> 47#include <stdlib.h> 48#include <string.h> 49#include <unistd.h> 50 51#include <db.h> 52#include "btree.h" 53 54static int bt_meta(BTREE *); 55 56/* 57 * BT_CLOSE -- Close a btree. 58 * 59 * Parameters: 60 * dbp: pointer to access method 61 * 62 * Returns: 63 * RET_ERROR, RET_SUCCESS 64 */ 65int 66__bt_close(DB *dbp) 67{ 68 BTREE *t; 69 int fd; 70 71 t = dbp->internal; 72 73 /* Toss any page pinned across calls. */ 74 if (t->bt_pinned != NULL) { 75 mpool_put(t->bt_mp, t->bt_pinned, 0); 76 t->bt_pinned = NULL; 77 } 78 79 /* Sync the tree. */ 80 if (__bt_sync(dbp, 0) == RET_ERROR) 81 return (RET_ERROR); 82 83 /* Close the memory pool. */ 84 if (mpool_close(t->bt_mp) == RET_ERROR) 85 return (RET_ERROR); 86 87 /* Free random memory. */ 88 if (t->bt_cursor.key.data != NULL) { 89 free(t->bt_cursor.key.data); 90 t->bt_cursor.key.size = 0; 91 t->bt_cursor.key.data = NULL; 92 } 93 if (t->bt_rkey.data) { 94 free(t->bt_rkey.data); 95 t->bt_rkey.size = 0; 96 t->bt_rkey.data = NULL; 97 } 98 if (t->bt_rdata.data) { 99 free(t->bt_rdata.data); 100 t->bt_rdata.size = 0; 101 t->bt_rdata.data = NULL; 102 } 103 104 fd = t->bt_fd; 105 free(t); 106 free(dbp); 107 return (close(fd) ? RET_ERROR : RET_SUCCESS); 108} 109 110/* 111 * BT_SYNC -- sync the btree to disk. 112 * 113 * Parameters: 114 * dbp: pointer to access method 115 * 116 * Returns: 117 * RET_SUCCESS, RET_ERROR. 118 */ 119int 120__bt_sync(const DB *dbp, u_int flags) 121{ 122 BTREE *t; 123 int status; 124 125 t = dbp->internal; 126 127 /* Toss any page pinned across calls. */ 128 if (t->bt_pinned != NULL) { 129 mpool_put(t->bt_mp, t->bt_pinned, 0); 130 t->bt_pinned = NULL; 131 } 132 133 /* Sync doesn't currently take any flags. */ 134 if (flags != 0) { 135 errno = EINVAL; 136 return (RET_ERROR); 137 } 138 139 if (F_ISSET(t, B_INMEM | B_RDONLY) || !F_ISSET(t, B_MODIFIED)) 140 return (RET_SUCCESS); 141 142 if (F_ISSET(t, B_METADIRTY) && bt_meta(t) == RET_ERROR) 143 return (RET_ERROR); 144 145 if ((status = mpool_sync(t->bt_mp)) == RET_SUCCESS) 146 F_CLR(t, B_MODIFIED); 147 148 return (status); 149} 150 151/* 152 * BT_META -- write the tree meta data to disk. 153 * 154 * Parameters: 155 * t: tree 156 * 157 * Returns: 158 * RET_ERROR, RET_SUCCESS 159 */ 160static int 161bt_meta(BTREE *t) 162{ 163 BTMETA m; 164 void *p; 165 166 if ((p = mpool_get(t->bt_mp, P_META, 0)) == NULL) 167 return (RET_ERROR); 168 169 /* Fill in metadata. */ 170 m.magic = BTREEMAGIC; 171 m.version = BTREEVERSION; 172 m.psize = t->bt_psize; 173 m.free = t->bt_free; 174 m.nrecs = t->bt_nrecs; 175 m.flags = F_ISSET(t, SAVEMETA); 176 177 memmove(p, &m, sizeof(BTMETA)); 178 mpool_put(t->bt_mp, p, MPOOL_DIRTY); 179 return (RET_SUCCESS); 180} 181