1 /* $NetBSD: bt_close.c,v 1.12 2007/02/03 23:46:09 christos 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 #include <sys/cdefs.h> 36 #if defined(LIBC_SCCS) && !defined(lint) 37 #if 0 38 static char sccsid[] = "@(#)bt_close.c 8.7 (Berkeley) 8/17/94"; 39 #else 40 __RCSID("$NetBSD: bt_close.c,v 1.12 2007/02/03 23:46:09 christos Exp $"); 41 #endif 42 #endif /* LIBC_SCCS and not lint */ 43 44 #include "namespace.h" 45 46 #include <assert.h> 47 #include <errno.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <unistd.h> 52 53 #include <db.h> 54 #include "btree.h" 55 56 static int bt_meta(BTREE *); 57 58 /* 59 * BT_CLOSE -- Close a btree. 60 * 61 * Parameters: 62 * dbp: pointer to access method 63 * 64 * Returns: 65 * RET_ERROR, RET_SUCCESS 66 */ 67 int 68 __bt_close(DB *dbp) 69 { 70 BTREE *t; 71 int fd; 72 73 t = dbp->internal; 74 75 /* Toss any page pinned across calls. */ 76 if (t->bt_pinned != NULL) { 77 mpool_put(t->bt_mp, t->bt_pinned, 0); 78 t->bt_pinned = NULL; 79 } 80 81 /* Sync the tree. */ 82 if (__bt_sync(dbp, 0) == RET_ERROR) 83 return (RET_ERROR); 84 85 /* Close the memory pool. */ 86 if (mpool_close(t->bt_mp) == RET_ERROR) 87 return (RET_ERROR); 88 89 /* Free random memory. */ 90 if (t->bt_cursor.key.data != NULL) { 91 free(t->bt_cursor.key.data); 92 t->bt_cursor.key.size = 0; 93 t->bt_cursor.key.data = NULL; 94 } 95 if (t->bt_rkey.data) { 96 free(t->bt_rkey.data); 97 t->bt_rkey.size = 0; 98 t->bt_rkey.data = NULL; 99 } 100 if (t->bt_rdata.data) { 101 free(t->bt_rdata.data); 102 t->bt_rdata.size = 0; 103 t->bt_rdata.data = NULL; 104 } 105 106 fd = t->bt_fd; 107 free(t); 108 free(dbp); 109 return (close(fd) ? RET_ERROR : RET_SUCCESS); 110 } 111 112 /* 113 * BT_SYNC -- sync the btree to disk. 114 * 115 * Parameters: 116 * dbp: pointer to access method 117 * 118 * Returns: 119 * RET_SUCCESS, RET_ERROR. 120 */ 121 int 122 __bt_sync(const DB *dbp, u_int flags) 123 { 124 BTREE *t; 125 int status; 126 127 t = dbp->internal; 128 129 /* Toss any page pinned across calls. */ 130 if (t->bt_pinned != NULL) { 131 mpool_put(t->bt_mp, t->bt_pinned, 0); 132 t->bt_pinned = NULL; 133 } 134 135 /* Sync doesn't currently take any flags. */ 136 if (flags != 0) { 137 errno = EINVAL; 138 return (RET_ERROR); 139 } 140 141 if (F_ISSET(t, B_INMEM | B_RDONLY) || !F_ISSET(t, B_MODIFIED)) 142 return (RET_SUCCESS); 143 144 if (F_ISSET(t, B_METADIRTY) && bt_meta(t) == RET_ERROR) 145 return (RET_ERROR); 146 147 if ((status = mpool_sync(t->bt_mp)) == RET_SUCCESS) 148 F_CLR(t, B_MODIFIED); 149 150 return (status); 151 } 152 153 /* 154 * BT_META -- write the tree meta data to disk. 155 * 156 * Parameters: 157 * t: tree 158 * 159 * Returns: 160 * RET_ERROR, RET_SUCCESS 161 */ 162 static int 163 bt_meta(BTREE *t) 164 { 165 BTMETA m; 166 void *p; 167 168 if ((p = mpool_get(t->bt_mp, P_META, 0)) == NULL) 169 return (RET_ERROR); 170 171 /* Fill in metadata. */ 172 m.magic = BTREEMAGIC; 173 m.version = BTREEVERSION; 174 m.psize = t->bt_psize; 175 m.free = t->bt_free; 176 m.nrecs = t->bt_nrecs; 177 m.flags = F_ISSET(t, SAVEMETA); 178 179 memmove(p, &m, sizeof(BTMETA)); 180 mpool_put(t->bt_mp, p, MPOOL_DIRTY); 181 return (RET_SUCCESS); 182 } 183