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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 | ||
51 | #ifndef MDASSEMBLE | |
52 | ||
53 | static void examine_mbr(struct supertype *st, char *homehost) | |
54 | { | |
55 | struct MBR *sb = st->sb; | |
56 | int i; | |
57 | ||
58 | printf(" MBR Magic : %04x\n", sb->magic); | |
59 | for (i = 0; i < MBR_PARTITIONS; i++) | |
60 | if (sb->parts[i].blocks_num) | |
61 | printf("Partition[%d] : %12lu sectors at %12lu (type %02x)\n", | |
62 | i, | |
63 | (unsigned long)__le32_to_cpu(sb->parts[i].blocks_num), | |
64 | (unsigned long)__le32_to_cpu(sb->parts[i].first_sect_lba), | |
65 | sb->parts[i].part_type); | |
66 | ||
67 | } | |
68 | ||
69 | #endif /*MDASSEMBLE */ | |
70 | ||
71 | static int load_super_mbr(struct supertype *st, int fd, char *devname) | |
72 | { | |
73 | /* try to read an mbr | |
74 | * Return | |
75 | * 0 on success | |
76 | * 1 cannot get record | |
77 | * 2 record is meaningless | |
78 | */ | |
79 | struct MBR *super; | |
80 | ||
81 | free_mbr(st); | |
82 | ||
0f22b998 | 83 | if (posix_memalign((void**)&super, 512, 512) != 0) { |
1ade5cc1 | 84 | pr_err("could not allocate superblock\n"); |
0f22b998 N |
85 | return 1; |
86 | } | |
87 | ||
0f22b998 N |
88 | lseek(fd, 0, 0); |
89 | if (read(fd, super, sizeof(*super)) != sizeof(*super)) { | |
90 | if (devname) | |
e7b84f9d | 91 | pr_err("Cannot read partition table on %s\n", |
0f22b998 N |
92 | devname); |
93 | free(super); | |
94 | return 1; | |
95 | } | |
1011e834 | 96 | |
0f22b998 N |
97 | if (super->magic != MBR_SIGNATURE_MAGIC) { |
98 | if (devname) | |
e7b84f9d | 99 | pr_err("No partition table found on %s\n", |
0f22b998 N |
100 | devname); |
101 | free(super); | |
102 | return 1; | |
103 | } | |
104 | ||
105 | st->sb = super; | |
106 | ||
107 | if (st->ss == NULL) { | |
108 | st->ss = &mbr; | |
109 | st->minor_version = 0; | |
110 | st->max_devs = 1; | |
111 | st->info = NULL; | |
112 | } | |
113 | return 0; | |
114 | } | |
115 | ||
116 | static int store_mbr(struct supertype *st, int fd) | |
117 | { | |
118 | struct MBR *old, *super; | |
119 | ||
120 | if (posix_memalign((void**)&old, 512, 512) != 0) { | |
1ade5cc1 | 121 | pr_err("could not allocate superblock\n"); |
0f22b998 N |
122 | return 1; |
123 | } | |
124 | ||
0f22b998 N |
125 | lseek(fd, 0, 0); |
126 | if (read(fd, old, sizeof(*old)) != sizeof(*old)) { | |
127 | free(old); | |
128 | return 1; | |
129 | } | |
130 | ||
131 | super = st->sb; | |
132 | memcpy(super->pad, old->pad, sizeof(super->pad)); | |
133 | free(old); | |
134 | lseek(fd, 0, 0); | |
135 | if (write(fd, super, sizeof(*super)) != sizeof(*super)) | |
136 | return 4; | |
137 | fsync(fd); | |
138 | ioctl(fd, BLKRRPART, 0); | |
139 | return 0; | |
140 | } | |
141 | ||
a5d85af7 | 142 | static void getinfo_mbr(struct supertype *st, struct mdinfo *info, char *map) |
0f22b998 N |
143 | { |
144 | struct MBR *sb = st->sb; | |
145 | int i; | |
146 | ||
147 | memset(&info->array, 0, sizeof(info->array)); | |
148 | memset(&info->disk, 0, sizeof(info->disk)); | |
149 | strcpy(info->text_version, "mbr"); | |
150 | strcpy(info->name, "mbr"); | |
151 | info->component_size = 0; | |
152 | ||
153 | for (i = 0; i < MBR_PARTITIONS ; i++) | |
154 | if (sb->parts[i].blocks_num) { | |
1011e834 | 155 | unsigned long last = |
0f22b998 N |
156 | (unsigned long)__le32_to_cpu(sb->parts[i].blocks_num) |
157 | + (unsigned long)__le32_to_cpu(sb->parts[i].first_sect_lba); | |
158 | if (last > info->component_size) | |
159 | info->component_size = last; | |
160 | } | |
161 | ||
162 | } | |
163 | ||
164 | static struct supertype *match_metadata_desc(char *arg) | |
165 | { | |
62f5838f | 166 | struct supertype *st; |
0f22b998 | 167 | |
0f22b998 N |
168 | if (strcmp(arg, "mbr") != 0) |
169 | return NULL; | |
170 | ||
503975b9 | 171 | st = xmalloc(sizeof(*st)); |
0f22b998 N |
172 | st->ss = &mbr; |
173 | st->info = NULL; | |
174 | st->minor_version = 0; | |
175 | st->max_devs = 1; | |
176 | st->sb = NULL; | |
177 | return st; | |
178 | } | |
179 | ||
180 | #ifndef MDASSEMBLE | |
181 | static int validate_geometry(struct supertype *st, int level, | |
182 | int layout, int raiddisks, | |
c21e737b | 183 | int *chunk, unsigned long long size, |
af4348dd | 184 | unsigned long long data_offset, |
0f22b998 N |
185 | char *subdev, unsigned long long *freesize, |
186 | int verbose) | |
187 | { | |
e7b84f9d | 188 | pr_err("mbr metadata cannot be used this way\n"); |
0f22b998 N |
189 | return 0; |
190 | } | |
191 | #endif | |
192 | ||
193 | struct superswitch mbr = { | |
194 | #ifndef MDASSEMBLE | |
195 | .examine_super = examine_mbr, | |
0f22b998 | 196 | .validate_geometry = validate_geometry, |
71204a50 | 197 | #endif |
0f22b998 N |
198 | .match_metadata_desc = match_metadata_desc, |
199 | .load_super = load_super_mbr, | |
200 | .store_super = store_mbr, | |
201 | .getinfo_super = getinfo_mbr, | |
202 | .free_super = free_mbr, | |
203 | .name = "mbr", | |
204 | }; |