1 /* $OpenBSD: bt_close.c,v 1.4 1999/02/15 05:11:22 millert 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #if defined(LIBC_SCCS) && !defined(lint) 40 #if 0 41 static char sccsid[] = "@(#)bt_close.c 8.7 (Berkeley) 8/17/94"; 42 #else 43 static char rcsid[] = "$OpenBSD: bt_close.c,v 1.4 1999/02/15 05:11:22 millert Exp $"; 44 #endif 45 #endif /* LIBC_SCCS and not lint */ 46 47 #include <sys/param.h> 48 49 #include <errno.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 55 #include <db.h> 56 #include "btree.h" 57 58 static int bt_meta __P((BTREE *)); 59 60 /* 61 * BT_CLOSE -- Close a btree. 62 * 63 * Parameters: 64 * dbp: pointer to access method 65 * 66 * Returns: 67 * RET_ERROR, RET_SUCCESS 68 */ 69 int 70 __bt_close(dbp) 71 DB *dbp; 72 { 73 BTREE *t; 74 int fd; 75 76 t = dbp->internal; 77 78 /* Toss any page pinned across calls. */ 79 if (t->bt_pinned != NULL) { 80 mpool_put(t->bt_mp, t->bt_pinned, 0); 81 t->bt_pinned = NULL; 82 } 83 84 /* Sync the tree. */ 85 if (__bt_sync(dbp, 0) == RET_ERROR) 86 return (RET_ERROR); 87 88 /* Close the memory pool. */ 89 if (mpool_close(t->bt_mp) == RET_ERROR) 90 return (RET_ERROR); 91 92 /* Free random memory. */ 93 if (t->bt_cursor.key.data != NULL) { 94 free(t->bt_cursor.key.data); 95 t->bt_cursor.key.size = 0; 96 t->bt_cursor.key.data = NULL; 97 } 98 if (t->bt_rkey.data) { 99 free(t->bt_rkey.data); 100 t->bt_rkey.size = 0; 101 t->bt_rkey.data = NULL; 102 } 103 if (t->bt_rdata.data) { 104 free(t->bt_rdata.data); 105 t->bt_rdata.size = 0; 106 t->bt_rdata.data = NULL; 107 } 108 109 fd = t->bt_fd; 110 free(t); 111 free(dbp); 112 return (close(fd) ? RET_ERROR : RET_SUCCESS); 113 } 114 115 /* 116 * BT_SYNC -- sync the btree to disk. 117 * 118 * Parameters: 119 * dbp: pointer to access method 120 * 121 * Returns: 122 * RET_SUCCESS, RET_ERROR. 123 */ 124 int 125 __bt_sync(dbp, flags) 126 const DB *dbp; 127 u_int flags; 128 { 129 BTREE *t; 130 int status; 131 132 t = dbp->internal; 133 134 /* Toss any page pinned across calls. */ 135 if (t->bt_pinned != NULL) { 136 mpool_put(t->bt_mp, t->bt_pinned, 0); 137 t->bt_pinned = NULL; 138 } 139 140 /* Sync doesn't currently take any flags. */ 141 if (flags != 0) { 142 errno = EINVAL; 143 return (RET_ERROR); 144 } 145 146 if (F_ISSET(t, B_INMEM | B_RDONLY) || !F_ISSET(t, B_MODIFIED)) 147 return (RET_SUCCESS); 148 149 if (F_ISSET(t, B_METADIRTY) && bt_meta(t) == RET_ERROR) 150 return (RET_ERROR); 151 152 if ((status = mpool_sync(t->bt_mp)) == RET_SUCCESS) 153 F_CLR(t, B_MODIFIED); 154 155 return (status); 156 } 157 158 /* 159 * BT_META -- write the tree meta data to disk. 160 * 161 * Parameters: 162 * t: tree 163 * 164 * Returns: 165 * RET_ERROR, RET_SUCCESS 166 */ 167 static int 168 bt_meta(t) 169 BTREE *t; 170 { 171 BTMETA m; 172 void *p; 173 174 if ((p = mpool_get(t->bt_mp, P_META, 0)) == NULL) 175 return (RET_ERROR); 176 177 /* Fill in metadata. */ 178 m.magic = BTREEMAGIC; 179 m.version = BTREEVERSION; 180 m.psize = t->bt_psize; 181 m.free = t->bt_free; 182 m.nrecs = t->bt_nrecs; 183 m.flags = F_ISSET(t, SAVEMETA); 184 185 memmove(p, &m, sizeof(BTMETA)); 186 mpool_put(t->bt_mp, p, MPOOL_DIRTY); 187 return (RET_SUCCESS); 188 } 189