rec_close.c revision 189291 
1/*-
2 * Copyright (c) 1990, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char sccsid[] = "@(#)rec_close.c	8.6 (Berkeley) 8/18/94";
32#endif /* LIBC_SCCS and not lint */
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: head/lib/libc/db/recno/rec_close.c 189291 2009-03-02 23:47:18Z delphij $");
35
36#include "namespace.h"
37#include <sys/types.h>
38#include <sys/uio.h>
39#include <sys/mman.h>
40
41#include <errno.h>
42#include <limits.h>
43#include <stdio.h>
44#include <unistd.h>
45#include "un-namespace.h"
46
47#include <db.h>
48#include "recno.h"
49
50/*
51 * __REC_CLOSE -- Close a recno tree.
52 *
53 * Parameters:
54 *	dbp:	pointer to access method
55 *
56 * Returns:
57 *	RET_ERROR, RET_SUCCESS
58 */
59int
60__rec_close(DB *dbp)
61{
62	BTREE *t;
63	int status;
64
65	t = dbp->internal;
66
67	/* Toss any page pinned across calls. */
68	if (t->bt_pinned != NULL) {
69		mpool_put(t->bt_mp, t->bt_pinned, 0);
70		t->bt_pinned = NULL;
71	}
72
73	if (__rec_sync(dbp, 0) == RET_ERROR)
74		return (RET_ERROR);
75
76	/* Committed to closing. */
77	status = RET_SUCCESS;
78	if (F_ISSET(t, R_MEMMAPPED) && munmap(t->bt_smap, t->bt_msize))
79		status = RET_ERROR;
80
81	if (!F_ISSET(t, R_INMEM)) {
82		if (F_ISSET(t, R_CLOSEFP)) {
83			if (fclose(t->bt_rfp))
84				status = RET_ERROR;
85		} else
86			if (_close(t->bt_rfd))
87				status = RET_ERROR;
88	}
89
90	if (__bt_close(dbp) == RET_ERROR)
91		status = RET_ERROR;
92
93	return (status);
94}
95
96/*
97 * __REC_SYNC -- sync the recno tree to disk.
98 *
99 * Parameters:
100 *	dbp:	pointer to access method
101 *
102 * Returns:
103 *	RET_SUCCESS, RET_ERROR.
104 */
105int
106__rec_sync(const DB *dbp, u_int flags)
107{
108	struct iovec iov[2];
109	BTREE *t;
110	DBT data, key;
111	off_t off;
112	recno_t scursor, trec;
113	int status;
114
115	t = dbp->internal;
116
117	/* Toss any page pinned across calls. */
118	if (t->bt_pinned != NULL) {
119		mpool_put(t->bt_mp, t->bt_pinned, 0);
120		t->bt_pinned = NULL;
121	}
122
123	if (flags == R_RECNOSYNC)
124		return (__bt_sync(dbp, 0));
125
126	if (F_ISSET(t, R_RDONLY | R_INMEM) || !F_ISSET(t, R_MODIFIED))
127		return (RET_SUCCESS);
128
129	/* Read any remaining records into the tree. */
130	if (!F_ISSET(t, R_EOF) && t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR)
131		return (RET_ERROR);
132
133	/* Rewind the file descriptor. */
134	if (lseek(t->bt_rfd, (off_t)0, SEEK_SET) != 0)
135		return (RET_ERROR);
136
137	/* Save the cursor. */
138	scursor = t->bt_cursor.rcursor;
139
140	key.size = sizeof(recno_t);
141	key.data = &trec;
142
143	if (F_ISSET(t, R_FIXLEN)) {
144		/*
145		 * We assume that fixed length records are all fixed length.
146		 * Any that aren't are either EINVAL'd or corrected by the
147		 * record put code.
148		 */
149		status = (dbp->seq)(dbp, &key, &data, R_FIRST);
150		while (status == RET_SUCCESS) {
151			if (_write(t->bt_rfd, data.data, data.size) !=
152			    data.size)
153				return (RET_ERROR);
154			status = (dbp->seq)(dbp, &key, &data, R_NEXT);
155		}
156	} else {
157		iov[1].iov_base = (char *)&t->bt_bval;
158		iov[1].iov_len = 1;
159
160		status = (dbp->seq)(dbp, &key, &data, R_FIRST);
161		while (status == RET_SUCCESS) {
162			iov[0].iov_base = data.data;
163			iov[0].iov_len = data.size;
164			if (_writev(t->bt_rfd, iov, 2) != data.size + 1)
165				return (RET_ERROR);
166			status = (dbp->seq)(dbp, &key, &data, R_NEXT);
167		}
168	}
169
170	/* Restore the cursor. */
171	t->bt_cursor.rcursor = scursor;
172
173	if (status == RET_ERROR)
174		return (RET_ERROR);
175	if ((off = lseek(t->bt_rfd, (off_t)0, SEEK_CUR)) == -1)
176		return (RET_ERROR);
177	if (ftruncate(t->bt_rfd, off))
178		return (RET_ERROR);
179	F_CLR(t, R_MODIFIED);
180	return (RET_SUCCESS);
181}
182