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 * 4. 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 33 #if defined(LIBC_SCCS) && !defined(lint) 34 static char sccsid[] = "@(#)bt_close.c 8.7 (Berkeley) 8/17/94"; 35 #endif /* LIBC_SCCS and not lint */ 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include "namespace.h" 40 #include <sys/param.h> 41 42 #include <errno.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <unistd.h> 47 #include "un-namespace.h" 48 49 #include <db.h> 50 #include "btree.h" 51 52 static int bt_meta(BTREE *); 53 54 /* 55 * BT_CLOSE -- Close a btree. 56 * 57 * Parameters: 58 * dbp: pointer to access method 59 * 60 * Returns: 61 * RET_ERROR, RET_SUCCESS 62 */ 63 int 64 __bt_close(DB *dbp) 65 { 66 BTREE *t; 67 int fd; 68 69 t = dbp->internal; 70 71 /* Toss any page pinned across calls. */ 72 if (t->bt_pinned != NULL) { 73 mpool_put(t->bt_mp, t->bt_pinned, 0); 74 t->bt_pinned = NULL; 75 } 76 77 /* Sync the tree. */ 78 if (__bt_sync(dbp, 0) == RET_ERROR) 79 return (RET_ERROR); 80 81 /* Close the memory pool. */ 82 if (mpool_close(t->bt_mp) == RET_ERROR) 83 return (RET_ERROR); 84 85 /* Free random memory. */ 86 if (t->bt_cursor.key.data != NULL) { 87 free(t->bt_cursor.key.data); 88 t->bt_cursor.key.size = 0; 89 t->bt_cursor.key.data = NULL; 90 } 91 if (t->bt_rkey.data) { 92 free(t->bt_rkey.data); 93 t->bt_rkey.size = 0; 94 t->bt_rkey.data = NULL; 95 } 96 if (t->bt_rdata.data) { 97 free(t->bt_rdata.data); 98 t->bt_rdata.size = 0; 99 t->bt_rdata.data = NULL; 100 } 101 102 fd = t->bt_fd; 103 free(t); 104 free(dbp); 105 return (_close(fd) ? RET_ERROR : RET_SUCCESS); 106 } 107 108 /* 109 * BT_SYNC -- sync the btree to disk. 110 * 111 * Parameters: 112 * dbp: pointer to access method 113 * 114 * Returns: 115 * RET_SUCCESS, RET_ERROR. 116 */ 117 int 118 __bt_sync(const DB *dbp, u_int flags) 119 { 120 BTREE *t; 121 int status; 122 123 t = dbp->internal; 124 125 /* Toss any page pinned across calls. */ 126 if (t->bt_pinned != NULL) { 127 mpool_put(t->bt_mp, t->bt_pinned, 0); 128 t->bt_pinned = NULL; 129 } 130 131 /* Sync doesn't currently take any flags. */ 132 if (flags != 0) { 133 errno = EINVAL; 134 return (RET_ERROR); 135 } 136 137 if (F_ISSET(t, B_INMEM | B_RDONLY) || !F_ISSET(t, B_MODIFIED)) 138 return (RET_SUCCESS); 139 140 if (F_ISSET(t, B_METADIRTY) && bt_meta(t) == RET_ERROR) 141 return (RET_ERROR); 142 143 if ((status = mpool_sync(t->bt_mp)) == RET_SUCCESS) 144 F_CLR(t, B_MODIFIED); 145 146 return (status); 147 } 148 149 /* 150 * BT_META -- write the tree meta data to disk. 151 * 152 * Parameters: 153 * t: tree 154 * 155 * Returns: 156 * RET_ERROR, RET_SUCCESS 157 */ 158 static int 159 bt_meta(BTREE *t) 160 { 161 BTMETA m; 162 void *p; 163 164 if ((p = mpool_get(t->bt_mp, P_META, 0)) == NULL) 165 return (RET_ERROR); 166 167 /* Fill in metadata. */ 168 m.magic = BTREEMAGIC; 169 m.version = BTREEVERSION; 170 m.psize = t->bt_psize; 171 m.free = t->bt_free; 172 m.nrecs = t->bt_nrecs; 173 m.flags = F_ISSET(t, SAVEMETA); 174 175 memmove(p, &m, sizeof(BTMETA)); 176 mpool_put(t->bt_mp, p, MPOOL_DIRTY); 177 return (RET_SUCCESS); 178 } 179