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
_pool_not_supported(const char * op)28 static 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
_pool_can_handle(struct labeller * l __attribute ((unused)),void * buf,uint64_t sector)34 static 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
_pool_write(struct label * label __attribute ((unused)),void * buf __attribute ((unused)))55 static int _pool_write(struct label *label __attribute((unused)), void *buf __attribute((unused)))
56 {
57 _pool_not_supported("write");
58 return 0;
59 }
60
_pool_read(struct labeller * l,struct device * dev,void * buf,struct label ** label)61 static 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
_pool_initialise_label(struct labeller * l __attribute ((unused)),struct label * label)69 static int _pool_initialise_label(struct labeller *l __attribute((unused)), struct label *label)
70 {
71 strcpy(label->type, "POOL");
72
73 return 1;
74 }
75
_pool_destroy_label(struct labeller * l __attribute ((unused)),struct label * label __attribute ((unused)))76 static void _pool_destroy_label(struct labeller *l __attribute((unused)), struct label *label __attribute((unused)))
77 {
78 return;
79 }
80
_label_pool_destroy(struct labeller * l)81 static void _label_pool_destroy(struct labeller *l)
82 {
83 dm_free(l);
84 }
85
86 struct 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
pool_labeller_create(struct format_type * fmt)96 struct 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