1 /* $OpenBSD: bt_close.c,v 1.10 2015/01/16 16:48:51 deraadt 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. 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 #include <errno.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <unistd.h> 40 41 #include <db.h> 42 #include "btree.h" 43 44 static int bt_meta(BTREE *); 45 46 /* 47 * BT_CLOSE -- Close a btree. 48 * 49 * Parameters: 50 * dbp: pointer to access method 51 * 52 * Returns: 53 * RET_ERROR, RET_SUCCESS 54 */ 55 int 56 __bt_close(DB *dbp) 57 { 58 BTREE *t; 59 int fd; 60 61 t = dbp->internal; 62 63 /* Toss any page pinned across calls. */ 64 if (t->bt_pinned != NULL) { 65 mpool_put(t->bt_mp, t->bt_pinned, 0); 66 t->bt_pinned = NULL; 67 } 68 69 /* Sync the tree. */ 70 if (__bt_sync(dbp, 0) == RET_ERROR) 71 return (RET_ERROR); 72 73 /* Close the memory pool. */ 74 if (mpool_close(t->bt_mp) == RET_ERROR) 75 return (RET_ERROR); 76 77 /* Free random memory. */ 78 if (t->bt_cursor.key.data != NULL) { 79 free(t->bt_cursor.key.data); 80 t->bt_cursor.key.size = 0; 81 t->bt_cursor.key.data = NULL; 82 } 83 if (t->bt_rkey.data) { 84 free(t->bt_rkey.data); 85 t->bt_rkey.size = 0; 86 t->bt_rkey.data = NULL; 87 } 88 if (t->bt_rdata.data) { 89 free(t->bt_rdata.data); 90 t->bt_rdata.size = 0; 91 t->bt_rdata.data = NULL; 92 } 93 94 fd = t->bt_fd; 95 free(t); 96 free(dbp); 97 return (close(fd) ? RET_ERROR : RET_SUCCESS); 98 } 99 100 /* 101 * BT_SYNC -- sync the btree to disk. 102 * 103 * Parameters: 104 * dbp: pointer to access method 105 * 106 * Returns: 107 * RET_SUCCESS, RET_ERROR. 108 */ 109 int 110 __bt_sync(dbp, flags) 111 const DB *dbp; 112 u_int flags; 113 { 114 BTREE *t; 115 int status; 116 117 t = dbp->internal; 118 119 /* Toss any page pinned across calls. */ 120 if (t->bt_pinned != NULL) { 121 mpool_put(t->bt_mp, t->bt_pinned, 0); 122 t->bt_pinned = NULL; 123 } 124 125 /* Sync doesn't currently take any flags. */ 126 if (flags != 0) { 127 errno = EINVAL; 128 return (RET_ERROR); 129 } 130 131 if (F_ISSET(t, B_INMEM | B_RDONLY) || !F_ISSET(t, B_MODIFIED)) 132 return (RET_SUCCESS); 133 134 if (F_ISSET(t, B_METADIRTY) && bt_meta(t) == RET_ERROR) 135 return (RET_ERROR); 136 137 if ((status = mpool_sync(t->bt_mp)) == RET_SUCCESS) 138 F_CLR(t, B_MODIFIED); 139 140 return (status); 141 } 142 143 /* 144 * BT_META -- write the tree meta data to disk. 145 * 146 * Parameters: 147 * t: tree 148 * 149 * Returns: 150 * RET_ERROR, RET_SUCCESS 151 */ 152 static int 153 bt_meta(t) 154 BTREE *t; 155 { 156 BTMETA m; 157 void *p; 158 159 if ((p = mpool_get(t->bt_mp, P_META, 0)) == NULL) 160 return (RET_ERROR); 161 162 /* Fill in metadata. */ 163 m.magic = BTREEMAGIC; 164 m.version = BTREEVERSION; 165 m.psize = t->bt_psize; 166 m.free = t->bt_free; 167 m.nrecs = t->bt_nrecs; 168 m.flags = F_ISSET(t, SAVEMETA); 169 170 memmove(p, &m, sizeof(BTMETA)); 171 mpool_put(t->bt_mp, p, MPOOL_DIRTY); 172 return (RET_SUCCESS); 173 } 174