1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 defined(LIBC_SCCS) && !defined(lint) 36 static char sccsid[] = "@(#)bt_close.c 8.7 (Berkeley) 8/17/94"; 37 #endif /* LIBC_SCCS and not lint */ 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include "namespace.h" 42 #include <sys/param.h> 43 44 #include <errno.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 #include "un-namespace.h" 50 51 #include <db.h> 52 #include "btree.h" 53 54 static 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 */ 65 int 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 */ 119 int 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) || 140 !F_ISSET(t, B_MODIFIED | B_METADIRTY)) 141 return (RET_SUCCESS); 142 143 if (F_ISSET(t, B_METADIRTY) && bt_meta(t) == RET_ERROR) 144 return (RET_ERROR); 145 146 if ((status = mpool_sync(t->bt_mp)) == RET_SUCCESS) 147 F_CLR(t, B_MODIFIED); 148 149 return (status); 150 } 151 152 /* 153 * BT_META -- write the tree meta data to disk. 154 * 155 * Parameters: 156 * t: tree 157 * 158 * Returns: 159 * RET_ERROR, RET_SUCCESS 160 */ 161 static int 162 bt_meta(BTREE *t) 163 { 164 BTMETA m; 165 void *p; 166 167 if ((p = mpool_get(t->bt_mp, P_META, 0)) == NULL) 168 return (RET_ERROR); 169 170 /* Fill in metadata. */ 171 m.magic = BTREEMAGIC; 172 m.version = BTREEVERSION; 173 m.psize = t->bt_psize; 174 m.free = t->bt_free; 175 m.nrecs = t->bt_nrecs; 176 m.flags = F_ISSET(t, SAVEMETA); 177 178 memmove(p, &m, sizeof(BTMETA)); 179 mpool_put(t->bt_mp, p, MPOOL_DIRTY); 180 return (RET_SUCCESS); 181 } 182