1/*-
2 * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
3 * 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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <sys/param.h>
31#include <sys/disklabel.h>
32#include <sys/mount.h>
33
34#include <ufs/ufs/dinode.h>
35#include <ufs/ffs/fs.h>
36
37#include <libufs.h>
38#include <libgeom.h>
39#include <core/geom.h>
40#include <misc/subr.h>
41
42#include "geom_journal.h"
43
44static struct fs *
45read_superblock(const char *prov)
46{
47	static struct uufsd disk;
48	struct fs *fs;
49
50	if (ufs_disk_fillout(&disk, prov) == -1)
51		return (NULL);
52	fs = &disk.d_fs;
53	ufs_disk_close(&disk);
54	return (fs);
55}
56
57int
58g_journal_ufs_exists(const char *prov)
59{
60
61	return (read_superblock(prov) != NULL);
62}
63
64int
65g_journal_ufs_using_last_sector(const char *prov)
66{
67	struct fs *fs;
68	off_t psize, fssize;
69
70	fs = read_superblock(prov);
71	if (fs == NULL)
72		return (0);
73	/* Provider size in 512 bytes blocks. */
74	psize = g_get_mediasize(prov) / DEV_BSIZE;
75	/* File system size in 512 bytes blocks. */
76	fssize = fsbtodb(fs, fs->fs_size);
77	return (psize <= fssize);
78}
79