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0f22b998 N |
1 | /* |
2 | * mdadm - manage Linux "md" devices aka RAID arrays. | |
3 | * | |
4 | * Copyright (C) 2010 Neil Brown <neilb@suse.de> | |
5 | * | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | * | |
21 | * Author: Neil Brown | |
22 | * Email: <neil@brown.name> | |
23 | * | |
24 | */ | |
25 | ||
26 | /* | |
27 | * 'mbr' is a pseudo metadata type for devices which have a | |
28 | * partition table in the Master Boot Record (mbr) also known | |
29 | * as a dos partition table. | |
30 | * | |
31 | * Obviously arrays cannot be created or assembled for this type. | |
32 | * It is used to allow a new bare device to have an partition table | |
33 | * added so the member partitions can then be included in other | |
34 | * arrays as relevant. | |
35 | * | |
36 | * The meaning operations are: | |
37 | * examine_super, but not brief_examine_super or export_examine | |
38 | * load_super | |
39 | * store_super | |
40 | */ | |
41 | ||
42 | #include "mdadm.h" | |
43 | #include "part.h" | |
44 | ||
45 | static void free_mbr(struct supertype *st) | |
46 | { | |
47 | free(st->sb); | |
48 | st->sb = NULL; | |
49 | } | |
50 | ||
0f22b998 N |
51 | static void examine_mbr(struct supertype *st, char *homehost) |
52 | { | |
53 | struct MBR *sb = st->sb; | |
54 | int i; | |
55 | ||
56 | printf(" MBR Magic : %04x\n", sb->magic); | |
57 | for (i = 0; i < MBR_PARTITIONS; i++) | |
8e2bca51 JC |
58 | /* |
59 | * Have to make every access through sb rather than using a | |
60 | * pointer to the partition table (or an entry), since the | |
61 | * entries are not properly aligned. | |
62 | */ | |
0f22b998 N |
63 | if (sb->parts[i].blocks_num) |
64 | printf("Partition[%d] : %12lu sectors at %12lu (type %02x)\n", | |
65 | i, | |
66 | (unsigned long)__le32_to_cpu(sb->parts[i].blocks_num), | |
67 | (unsigned long)__le32_to_cpu(sb->parts[i].first_sect_lba), | |
68 | sb->parts[i].part_type); | |
69 | ||
70 | } | |
71 | ||
0f22b998 N |
72 | static int load_super_mbr(struct supertype *st, int fd, char *devname) |
73 | { | |
74 | /* try to read an mbr | |
75 | * Return | |
76 | * 0 on success | |
77 | * 1 cannot get record | |
78 | * 2 record is meaningless | |
79 | */ | |
80 | struct MBR *super; | |
81 | ||
82 | free_mbr(st); | |
83 | ||
0f22b998 | 84 | if (posix_memalign((void**)&super, 512, 512) != 0) { |
1ade5cc1 | 85 | pr_err("could not allocate superblock\n"); |
0f22b998 N |
86 | return 1; |
87 | } | |
88 | ||
0f22b998 N |
89 | lseek(fd, 0, 0); |
90 | if (read(fd, super, sizeof(*super)) != sizeof(*super)) { | |
91 | if (devname) | |
e7b84f9d | 92 | pr_err("Cannot read partition table on %s\n", |
0f22b998 N |
93 | devname); |
94 | free(super); | |
95 | return 1; | |
96 | } | |
1011e834 | 97 | |
0f22b998 N |
98 | if (super->magic != MBR_SIGNATURE_MAGIC) { |
99 | if (devname) | |
e7b84f9d | 100 | pr_err("No partition table found on %s\n", |
0f22b998 N |
101 | devname); |
102 | free(super); | |
103 | return 1; | |
104 | } | |
105 | ||
106 | st->sb = super; | |
107 | ||
108 | if (st->ss == NULL) { | |
109 | st->ss = &mbr; | |
110 | st->minor_version = 0; | |
111 | st->max_devs = 1; | |
112 | st->info = NULL; | |
113 | } | |
114 | return 0; | |
115 | } | |
116 | ||
117 | static int store_mbr(struct supertype *st, int fd) | |
118 | { | |
119 | struct MBR *old, *super; | |
120 | ||
121 | if (posix_memalign((void**)&old, 512, 512) != 0) { | |
1ade5cc1 | 122 | pr_err("could not allocate superblock\n"); |
0f22b998 N |
123 | return 1; |
124 | } | |
125 | ||
0f22b998 N |
126 | lseek(fd, 0, 0); |
127 | if (read(fd, old, sizeof(*old)) != sizeof(*old)) { | |
128 | free(old); | |
129 | return 1; | |
130 | } | |
131 | ||
132 | super = st->sb; | |
133 | memcpy(super->pad, old->pad, sizeof(super->pad)); | |
134 | free(old); | |
135 | lseek(fd, 0, 0); | |
136 | if (write(fd, super, sizeof(*super)) != sizeof(*super)) | |
137 | return 4; | |
138 | fsync(fd); | |
139 | ioctl(fd, BLKRRPART, 0); | |
140 | return 0; | |
141 | } | |
142 | ||
a5d85af7 | 143 | static void getinfo_mbr(struct supertype *st, struct mdinfo *info, char *map) |
0f22b998 N |
144 | { |
145 | struct MBR *sb = st->sb; | |
146 | int i; | |
147 | ||
148 | memset(&info->array, 0, sizeof(info->array)); | |
149 | memset(&info->disk, 0, sizeof(info->disk)); | |
150 | strcpy(info->text_version, "mbr"); | |
151 | strcpy(info->name, "mbr"); | |
152 | info->component_size = 0; | |
153 | ||
154 | for (i = 0; i < MBR_PARTITIONS ; i++) | |
8e2bca51 JC |
155 | /* |
156 | * Have to make every access through sb rather than using a | |
157 | * pointer to the partition table (or an entry), since the | |
158 | * entries are not properly aligned. | |
159 | */ | |
0f22b998 | 160 | if (sb->parts[i].blocks_num) { |
1011e834 | 161 | unsigned long last = |
0f22b998 N |
162 | (unsigned long)__le32_to_cpu(sb->parts[i].blocks_num) |
163 | + (unsigned long)__le32_to_cpu(sb->parts[i].first_sect_lba); | |
164 | if (last > info->component_size) | |
165 | info->component_size = last; | |
166 | } | |
167 | ||
168 | } | |
169 | ||
170 | static struct supertype *match_metadata_desc(char *arg) | |
171 | { | |
62f5838f | 172 | struct supertype *st; |
0f22b998 | 173 | |
0f22b998 N |
174 | if (strcmp(arg, "mbr") != 0) |
175 | return NULL; | |
176 | ||
503975b9 | 177 | st = xmalloc(sizeof(*st)); |
0f22b998 N |
178 | st->ss = &mbr; |
179 | st->info = NULL; | |
180 | st->minor_version = 0; | |
181 | st->max_devs = 1; | |
182 | st->sb = NULL; | |
183 | return st; | |
184 | } | |
185 | ||
0f22b998 N |
186 | static int validate_geometry(struct supertype *st, int level, |
187 | int layout, int raiddisks, | |
c21e737b | 188 | int *chunk, unsigned long long size, |
af4348dd | 189 | unsigned long long data_offset, |
0f22b998 | 190 | char *subdev, unsigned long long *freesize, |
5308f117 | 191 | int consistency_policy, int verbose) |
0f22b998 | 192 | { |
e7b84f9d | 193 | pr_err("mbr metadata cannot be used this way\n"); |
0f22b998 N |
194 | return 0; |
195 | } | |
0f22b998 N |
196 | |
197 | struct superswitch mbr = { | |
0f22b998 | 198 | .examine_super = examine_mbr, |
0f22b998 N |
199 | .validate_geometry = validate_geometry, |
200 | .match_metadata_desc = match_metadata_desc, | |
201 | .load_super = load_super_mbr, | |
202 | .store_super = store_mbr, | |
203 | .getinfo_super = getinfo_mbr, | |
204 | .free_super = free_mbr, | |
205 | .name = "mbr", | |
206 | }; |