1/*	$NetBSD: pool_label.c,v 1.1.1.1 2008/12/22 00:17:51 haad Exp $	*/
2
3/*
4 * Copyright (C) 1997-2004 Sistina Software, Inc. All rights reserved.
5 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
6 *
7 * This file is part of LVM2.
8 *
9 * This copyrighted material is made available to anyone wishing to use,
10 * modify, copy, or redistribute it subject to the terms and conditions
11 * of the GNU Lesser General Public License v.2.1.
12 *
13 * You should have received a copy of the GNU Lesser General Public License
14 * along with this program; if not, write to the Free Software Foundation,
15 * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
16 */
17
18#include "lib.h"
19#include "label.h"
20#include "metadata.h"
21#include "xlate.h"
22#include "disk_rep.h"
23#include "pool_label.h"
24
25#include <sys/stat.h>
26#include <fcntl.h>
27
28static void _pool_not_supported(const char *op)
29{
30	log_error("The '%s' operation is not supported for the pool labeller.",
31		  op);
32}
33
34static int _pool_can_handle(struct labeller *l __attribute((unused)), void *buf, uint64_t sector)
35{
36
37	struct pool_disk pd;
38
39	/*
40	 * POOL label must always be in first sector
41	 */
42	if (sector)
43		return 0;
44
45	pool_label_in(&pd, buf);
46
47	/* can ignore 8 rightmost bits for ondisk format check */
48	if ((pd.pl_magic == POOL_MAGIC) &&
49	    (pd.pl_version >> 8 == POOL_VERSION >> 8))
50		return 1;
51
52	return 0;
53}
54
55static int _pool_write(struct label *label __attribute((unused)), void *buf __attribute((unused)))
56{
57	_pool_not_supported("write");
58	return 0;
59}
60
61static int _pool_read(struct labeller *l, struct device *dev, void *buf,
62		 struct label **label)
63{
64	struct pool_list pl;
65
66	return read_pool_label(&pl, l, dev, buf, label);
67}
68
69static int _pool_initialise_label(struct labeller *l __attribute((unused)), struct label *label)
70{
71	strcpy(label->type, "POOL");
72
73	return 1;
74}
75
76static void _pool_destroy_label(struct labeller *l __attribute((unused)), struct label *label __attribute((unused)))
77{
78	return;
79}
80
81static void _label_pool_destroy(struct labeller *l)
82{
83	dm_free(l);
84}
85
86struct label_ops _pool_ops = {
87      .can_handle = _pool_can_handle,
88      .write = _pool_write,
89      .read = _pool_read,
90      .verify = _pool_can_handle,
91      .initialise_label = _pool_initialise_label,
92      .destroy_label = _pool_destroy_label,
93      .destroy = _label_pool_destroy,
94};
95
96struct labeller *pool_labeller_create(struct format_type *fmt)
97{
98	struct labeller *l;
99
100	if (!(l = dm_malloc(sizeof(*l)))) {
101		log_error("Couldn't allocate labeller object.");
102		return NULL;
103	}
104
105	l->ops = &_pool_ops;
106	l->private = (const void *) fmt;
107
108	return l;
109}
110