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 * @(#)bt_close.c 8.7 (Berkeley) 8/17/94 33 * $FreeBSD: head/lib/libc/db/btree/bt_close.c 189291 2009-03-02 23:47:18Z delphij $ 34 */ 35 36 #include "namespace.h" 37 #include <sys/param.h> 38 39 #include <errno.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <unistd.h> 44 #include "un-namespace.h" 45 46 #include <db.h> 47 #include "btree.h" 48 49 static int bt_meta(BTREE *); 50 51 /* 52 * BT_CLOSE -- Close a btree. 53 * 54 * Parameters: 55 * dbp: pointer to access method 56 * 57 * Returns: 58 * RET_ERROR, RET_SUCCESS 59 */ 60 int 61 __bt_close(DB *dbp) 62 { 63 BTREE *t; 64 int fd; 65 66 t = dbp->internal; 67 68 /* Toss any page pinned across calls. */ 69 if (t->bt_pinned != NULL) { 70 mpool_put(t->bt_mp, t->bt_pinned, 0); 71 t->bt_pinned = NULL; 72 } 73 74 /* Sync the tree. */ 75 if (__bt_sync(dbp, 0) == RET_ERROR) 76 return (RET_ERROR); 77 78 /* Close the memory pool. */ 79 if (mpool_close(t->bt_mp) == RET_ERROR) 80 return (RET_ERROR); 81 82 /* Free random memory. */ 83 if (t->bt_cursor.key.data != NULL) { 84 free(t->bt_cursor.key.data); 85 t->bt_cursor.key.size = 0; 86 t->bt_cursor.key.data = NULL; 87 } 88 if (t->bt_rkey.data) { 89 free(t->bt_rkey.data); 90 t->bt_rkey.size = 0; 91 t->bt_rkey.data = NULL; 92 } 93 if (t->bt_rdata.data) { 94 free(t->bt_rdata.data); 95 t->bt_rdata.size = 0; 96 t->bt_rdata.data = NULL; 97 } 98 99 fd = t->bt_fd; 100 free(t); 101 free(dbp); 102 return (_close(fd) ? RET_ERROR : RET_SUCCESS); 103 } 104 105 /* 106 * BT_SYNC -- sync the btree to disk. 107 * 108 * Parameters: 109 * dbp: pointer to access method 110 * 111 * Returns: 112 * RET_SUCCESS, RET_ERROR. 113 */ 114 int 115 __bt_sync(const DB *dbp, unsigned int flags) 116 { 117 BTREE *t; 118 int status; 119 120 t = dbp->internal; 121 122 /* Toss any page pinned across calls. */ 123 if (t->bt_pinned != NULL) { 124 mpool_put(t->bt_mp, t->bt_pinned, 0); 125 t->bt_pinned = NULL; 126 } 127 128 /* Sync doesn't currently take any flags. */ 129 if (flags != 0) { 130 errno = EINVAL; 131 return (RET_ERROR); 132 } 133 134 if (F_ISSET(t, B_INMEM | B_RDONLY) || !F_ISSET(t, B_MODIFIED)) 135 return (RET_SUCCESS); 136 137 if (F_ISSET(t, B_METADIRTY) && bt_meta(t) == RET_ERROR) 138 return (RET_ERROR); 139 140 if ((status = mpool_sync(t->bt_mp)) == RET_SUCCESS) 141 F_CLR(t, B_MODIFIED); 142 143 return (status); 144 } 145 146 /* 147 * BT_META -- write the tree meta data to disk. 148 * 149 * Parameters: 150 * t: tree 151 * 152 * Returns: 153 * RET_ERROR, RET_SUCCESS 154 */ 155 static int 156 bt_meta(BTREE *t) 157 { 158 BTMETA m; 159 void *p; 160 161 if ((p = mpool_get(t->bt_mp, P_META, 0)) == NULL) 162 return (RET_ERROR); 163 164 /* Fill in metadata. */ 165 m.magic = BTREEMAGIC; 166 m.version = BTREEVERSION; 167 m.psize = t->bt_psize; 168 m.free = t->bt_free; 169 m.nrecs = t->bt_nrecs; 170 m.flags = F_ISSET(t, SAVEMETA); 171 172 memmove(p, &m, sizeof(BTMETA)); 173 mpool_put(t->bt_mp, p, MPOOL_DIRTY); 174 return (RET_SUCCESS); 175 } 176