1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
/*
* mdadm - manage Linux "md" devices aka RAID arrays.
*
* Copyright (C) 2010 Neil Brown <neilb@suse.de>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Neil Brown
* Email: <neil@brown.name>
*
*/
/*
* 'mbr' is a pseudo metadata type for devices which have a
* partition table in the Master Boot Record (mbr) also known
* as a dos partition table.
*
* Obviously arrays cannot be created or assembled for this type.
* It is used to allow a new bare device to have an partition table
* added so the member partitions can then be included in other
* arrays as relevant.
*
* The meaning operations are:
* examine_super, but not brief_examine_super or export_examine
* load_super
* store_super
*/
#include "mdadm.h"
#include "part.h"
static void free_mbr(struct supertype *st)
{
free(st->sb);
st->sb = NULL;
}
#ifndef MDASSEMBLE
static void examine_mbr(struct supertype *st, char *homehost)
{
struct MBR *sb = st->sb;
int i;
printf(" MBR Magic : %04x\n", sb->magic);
for (i = 0; i < MBR_PARTITIONS; i++)
if (sb->parts[i].blocks_num)
printf("Partition[%d] : %12lu sectors at %12lu (type %02x)\n",
i,
(unsigned long)__le32_to_cpu(sb->parts[i].blocks_num),
(unsigned long)__le32_to_cpu(sb->parts[i].first_sect_lba),
sb->parts[i].part_type);
}
#endif /*MDASSEMBLE */
static int load_super_mbr(struct supertype *st, int fd, char *devname)
{
/* try to read an mbr
* Return
* 0 on success
* 1 cannot get record
* 2 record is meaningless
*/
struct MBR *super;
free_mbr(st);
if (posix_memalign((void**)&super, 512, 512) != 0) {
pr_err("%s could not allocate superblock\n",
__func__);
return 1;
}
lseek(fd, 0, 0);
if (read(fd, super, sizeof(*super)) != sizeof(*super)) {
if (devname)
pr_err("Cannot read partition table on %s\n",
devname);
free(super);
return 1;
}
if (super->magic != MBR_SIGNATURE_MAGIC) {
if (devname)
pr_err("No partition table found on %s\n",
devname);
free(super);
return 1;
}
st->sb = super;
if (st->ss == NULL) {
st->ss = &mbr;
st->minor_version = 0;
st->max_devs = 1;
st->info = NULL;
}
return 0;
}
static int store_mbr(struct supertype *st, int fd)
{
struct MBR *old, *super;
if (posix_memalign((void**)&old, 512, 512) != 0) {
pr_err("%s could not allocate superblock\n",
__func__);
return 1;
}
lseek(fd, 0, 0);
if (read(fd, old, sizeof(*old)) != sizeof(*old)) {
free(old);
return 1;
}
super = st->sb;
memcpy(super->pad, old->pad, sizeof(super->pad));
free(old);
lseek(fd, 0, 0);
if (write(fd, super, sizeof(*super)) != sizeof(*super))
return 4;
fsync(fd);
ioctl(fd, BLKRRPART, 0);
return 0;
}
static void getinfo_mbr(struct supertype *st, struct mdinfo *info, char *map)
{
struct MBR *sb = st->sb;
int i;
memset(&info->array, 0, sizeof(info->array));
memset(&info->disk, 0, sizeof(info->disk));
strcpy(info->text_version, "mbr");
strcpy(info->name, "mbr");
info->component_size = 0;
for (i = 0; i < MBR_PARTITIONS ; i++)
if (sb->parts[i].blocks_num) {
unsigned long last =
(unsigned long)__le32_to_cpu(sb->parts[i].blocks_num)
+ (unsigned long)__le32_to_cpu(sb->parts[i].first_sect_lba);
if (last > info->component_size)
info->component_size = last;
}
}
static struct supertype *match_metadata_desc(char *arg)
{
struct supertype *st;
if (strcmp(arg, "mbr") != 0)
return NULL;
st = xmalloc(sizeof(*st));
st->ss = &mbr;
st->info = NULL;
st->minor_version = 0;
st->max_devs = 1;
st->sb = NULL;
return st;
}
#ifndef MDASSEMBLE
static int validate_geometry(struct supertype *st, int level,
int layout, int raiddisks,
int *chunk, unsigned long long size,
unsigned long long data_offset,
char *subdev, unsigned long long *freesize,
int verbose)
{
pr_err("mbr metadata cannot be used this way\n");
return 0;
}
#endif
struct superswitch mbr = {
#ifndef MDASSEMBLE
.examine_super = examine_mbr,
.validate_geometry = validate_geometry,
#endif
.match_metadata_desc = match_metadata_desc,
.load_super = load_super_mbr,
.store_super = store_mbr,
.getinfo_super = getinfo_mbr,
.free_super = free_mbr,
.name = "mbr",
};
|
