1/*	$NetBSD: bt_close.c,v 1.17 2016/09/24 21:31:25 christos 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#if HAVE_NBTOOL_CONFIG_H
36#include "nbtool_config.h"
37#endif
38
39#include <sys/cdefs.h>
40__RCSID("$NetBSD: bt_close.c,v 1.17 2016/09/24 21:31:25 christos Exp $");
41
42#include "namespace.h"
43
44#include <assert.h>
45#include <errno.h>
46#include <stdio.h>
47#include <stdlib.h>
48#include <string.h>
49#include <unistd.h>
50
51#include <db.h>
52#include "btree.h"
53
54static int bt_meta(BTREE *);
55
56/*
57 * BT_CLOSE -- Close a btree.
58 *
59 * Parameters:
60 *	dbp:	pointer to access method
61 *
62 * Returns:
63 *	RET_ERROR, RET_SUCCESS
64 */
65int
66__bt_close(DB *dbp)
67{
68	BTREE *t;
69	int fd;
70
71	t = dbp->internal;
72
73	/* Toss any page pinned across calls. */
74	if (t->bt_pinned != NULL) {
75		mpool_put(t->bt_mp, t->bt_pinned, 0);
76		t->bt_pinned = NULL;
77	}
78
79	/* Sync the tree. */
80	if (__bt_sync(dbp, 0) == RET_ERROR)
81		return (RET_ERROR);
82
83	/* Close the memory pool. */
84	if (mpool_close(t->bt_mp) == RET_ERROR)
85		return (RET_ERROR);
86
87	/* Free random memory. */
88	if (t->bt_cursor.key.data != NULL) {
89		free(t->bt_cursor.key.data);
90		t->bt_cursor.key.size = 0;
91		t->bt_cursor.key.data = NULL;
92	}
93	if (t->bt_rkey.data) {
94		free(t->bt_rkey.data);
95		t->bt_rkey.size = 0;
96		t->bt_rkey.data = NULL;
97	}
98	if (t->bt_rdata.data) {
99		free(t->bt_rdata.data);
100		t->bt_rdata.size = 0;
101		t->bt_rdata.data = NULL;
102	}
103
104	fd = t->bt_fd;
105	free(t);
106	free(dbp);
107	return (close(fd) ? RET_ERROR : RET_SUCCESS);
108}
109
110/*
111 * BT_SYNC -- sync the btree to disk.
112 *
113 * Parameters:
114 *	dbp:	pointer to access method
115 *
116 * Returns:
117 *	RET_SUCCESS, RET_ERROR.
118 */
119int
120__bt_sync(const DB *dbp, u_int flags)
121{
122	BTREE *t;
123	int status;
124
125	t = dbp->internal;
126
127	/* Toss any page pinned across calls. */
128	if (t->bt_pinned != NULL) {
129		mpool_put(t->bt_mp, t->bt_pinned, 0);
130		t->bt_pinned = NULL;
131	}
132
133	/* Sync doesn't currently take any flags. */
134	if (flags != 0) {
135		errno = EINVAL;
136		return (RET_ERROR);
137	}
138
139	if (F_ISSET(t, B_INMEM | B_RDONLY)
140	    || !F_ISSET(t, B_MODIFIED | B_METADIRTY))
141		return (RET_SUCCESS);
142
143	if (F_ISSET(t, B_METADIRTY) && bt_meta(t) == RET_ERROR)
144		return (RET_ERROR);
145
146	if ((status = mpool_sync(t->bt_mp)) == RET_SUCCESS)
147		F_CLR(t, B_MODIFIED);
148
149	return (status);
150}
151
152/*
153 * BT_META -- write the tree meta data to disk.
154 *
155 * Parameters:
156 *	t:	tree
157 *
158 * Returns:
159 *	RET_ERROR, RET_SUCCESS
160 */
161static int
162bt_meta(BTREE *t)
163{
164	BTMETA m;
165	void *p;
166
167	if ((p = mpool_get(t->bt_mp, P_META, 0)) == NULL)
168		return (RET_ERROR);
169
170	/* Fill in metadata. */
171	m.magic = BTREEMAGIC;
172	m.version = BTREEVERSION;
173	m.psize = t->bt_psize;
174	m.free = t->bt_free;
175	m.nrecs = t->bt_nrecs;
176	m.flags = F_ISSET(t, SAVEMETA);
177
178	memmove(p, &m, sizeof(BTMETA));
179	mpool_put(t->bt_mp, p, MPOOL_DIRTY);
180	return (RET_SUCCESS);
181}
182