1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
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 #if defined(LIBC_SCCS) && !defined(lint)
36 static char sccsid[] = "@(#)bt_close.c 8.7 (Berkeley) 8/17/94";
37 #endif /* LIBC_SCCS and not lint */
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
__bt_close(DB * dbp)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
__bt_sync(const DB * dbp,u_int flags)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) ||
137 !F_ISSET(t, B_MODIFIED | B_METADIRTY))
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
bt_meta(BTREE * t)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