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)
34static 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
52static 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 */
63int
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 */
117int
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 */
158static int
159bt_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