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 * 3. 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 * $FreeBSD: src/lib/libc/db/btree/bt_close.c,v 1.5 2000/01/27 23:06:05 jasone Exp $ 33 * $DragonFly: src/lib/libc/db/btree/bt_close.c,v 1.5 2005/09/19 09:20:37 asmodai Exp $ 34 * 35 * @(#)bt_close.c 8.7 (Berkeley) 8/17/94 36 */ 37 38 #include "namespace.h" 39 #include <sys/param.h> 40 41 #include <errno.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 #include "un-namespace.h" 47 48 #include <db.h> 49 #include "btree.h" 50 51 static int bt_meta (BTREE *); 52 53 /* 54 * BT_CLOSE -- Close a btree. 55 * 56 * Parameters: 57 * dbp: pointer to access method 58 * 59 * Returns: 60 * RET_ERROR, RET_SUCCESS 61 */ 62 int 63 __bt_close(DB *dbp) 64 { 65 BTREE *t; 66 int fd; 67 68 t = dbp->internal; 69 70 /* Toss any page pinned across calls. */ 71 if (t->bt_pinned != NULL) { 72 mpool_put(t->bt_mp, t->bt_pinned, 0); 73 t->bt_pinned = NULL; 74 } 75 76 /* Sync the tree. */ 77 if (__bt_sync(dbp, 0) == RET_ERROR) 78 return (RET_ERROR); 79 80 /* Close the memory pool. */ 81 if (mpool_close(t->bt_mp) == RET_ERROR) 82 return (RET_ERROR); 83 84 /* Free random memory. */ 85 if (t->bt_cursor.key.data != NULL) { 86 free(t->bt_cursor.key.data); 87 t->bt_cursor.key.size = 0; 88 t->bt_cursor.key.data = NULL; 89 } 90 if (t->bt_rkey.data) { 91 free(t->bt_rkey.data); 92 t->bt_rkey.size = 0; 93 t->bt_rkey.data = NULL; 94 } 95 if (t->bt_rdata.data) { 96 free(t->bt_rdata.data); 97 t->bt_rdata.size = 0; 98 t->bt_rdata.data = NULL; 99 } 100 101 fd = t->bt_fd; 102 free(t); 103 free(dbp); 104 return (_close(fd) ? RET_ERROR : RET_SUCCESS); 105 } 106 107 /* 108 * BT_SYNC -- sync the btree to disk. 109 * 110 * Parameters: 111 * dbp: pointer to access method 112 * 113 * Returns: 114 * RET_SUCCESS, RET_ERROR. 115 */ 116 int 117 __bt_sync(const DB *dbp, u_int flags) 118 { 119 BTREE *t; 120 int status; 121 122 t = dbp->internal; 123 124 /* Toss any page pinned across calls. */ 125 if (t->bt_pinned != NULL) { 126 mpool_put(t->bt_mp, t->bt_pinned, 0); 127 t->bt_pinned = NULL; 128 } 129 130 /* Sync doesn't currently take any flags. */ 131 if (flags != 0) { 132 errno = EINVAL; 133 return (RET_ERROR); 134 } 135 136 if (F_ISSET(t, B_INMEM | B_RDONLY) || !F_ISSET(t, B_MODIFIED)) 137 return (RET_SUCCESS); 138 139 if (F_ISSET(t, B_METADIRTY) && bt_meta(t) == RET_ERROR) 140 return (RET_ERROR); 141 142 if ((status = mpool_sync(t->bt_mp)) == RET_SUCCESS) 143 F_CLR(t, B_MODIFIED); 144 145 return (status); 146 } 147 148 /* 149 * BT_META -- write the tree meta data to disk. 150 * 151 * Parameters: 152 * t: tree 153 * 154 * Returns: 155 * RET_ERROR, RET_SUCCESS 156 */ 157 static int 158 bt_meta(BTREE *t) 159 { 160 BTMETA m; 161 void *p; 162 163 if ((p = mpool_get(t->bt_mp, P_META, 0)) == NULL) 164 return (RET_ERROR); 165 166 /* Fill in metadata. */ 167 m.magic = BTREEMAGIC; 168 m.version = BTREEVERSION; 169 m.psize = t->bt_psize; 170 m.free = t->bt_free; 171 m.nrecs = t->bt_nrecs; 172 m.flags = F_ISSET(t, SAVEMETA); 173 174 memmove(p, &m, sizeof(BTMETA)); 175 mpool_put(t->bt_mp, p, MPOOL_DIRTY); 176 return (RET_SUCCESS); 177 } 178