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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 | ||
83 | if (st->subarray[0]) | |
84 | return 1; | |
85 | ||
86 | if (posix_memalign((void**)&super, 512, 512) != 0) { | |
87 | fprintf(stderr, Name ": %s could not allocate superblock\n", | |
88 | __func__); | |
89 | return 1; | |
90 | } | |
91 | ||
92 | ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */ | |
93 | ||
94 | lseek(fd, 0, 0); | |
95 | if (read(fd, super, sizeof(*super)) != sizeof(*super)) { | |
96 | if (devname) | |
97 | fprintf(stderr, Name ": Cannot read partition table on %s\n", | |
98 | devname); | |
99 | free(super); | |
100 | return 1; | |
101 | } | |
102 | ||
103 | if (super->magic != MBR_SIGNATURE_MAGIC) { | |
104 | if (devname) | |
105 | fprintf(stderr, Name ": No partition table found on %s\n", | |
106 | devname); | |
107 | free(super); | |
108 | return 1; | |
109 | } | |
110 | ||
111 | st->sb = super; | |
112 | ||
113 | if (st->ss == NULL) { | |
114 | st->ss = &mbr; | |
115 | st->minor_version = 0; | |
116 | st->max_devs = 1; | |
117 | st->info = NULL; | |
118 | } | |
119 | return 0; | |
120 | } | |
121 | ||
122 | static int store_mbr(struct supertype *st, int fd) | |
123 | { | |
124 | struct MBR *old, *super; | |
125 | ||
126 | if (posix_memalign((void**)&old, 512, 512) != 0) { | |
127 | fprintf(stderr, Name ": %s could not allocate superblock\n", | |
128 | __func__); | |
129 | return 1; | |
130 | } | |
131 | ||
132 | ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */ | |
133 | ||
134 | lseek(fd, 0, 0); | |
135 | if (read(fd, old, sizeof(*old)) != sizeof(*old)) { | |
136 | free(old); | |
137 | return 1; | |
138 | } | |
139 | ||
140 | super = st->sb; | |
141 | memcpy(super->pad, old->pad, sizeof(super->pad)); | |
142 | free(old); | |
143 | lseek(fd, 0, 0); | |
144 | if (write(fd, super, sizeof(*super)) != sizeof(*super)) | |
145 | return 4; | |
146 | fsync(fd); | |
147 | ioctl(fd, BLKRRPART, 0); | |
148 | return 0; | |
149 | } | |
150 | ||
a5d85af7 | 151 | static void getinfo_mbr(struct supertype *st, struct mdinfo *info, char *map) |
0f22b998 N |
152 | { |
153 | struct MBR *sb = st->sb; | |
154 | int i; | |
155 | ||
156 | memset(&info->array, 0, sizeof(info->array)); | |
157 | memset(&info->disk, 0, sizeof(info->disk)); | |
158 | strcpy(info->text_version, "mbr"); | |
159 | strcpy(info->name, "mbr"); | |
160 | info->component_size = 0; | |
161 | ||
162 | for (i = 0; i < MBR_PARTITIONS ; i++) | |
163 | if (sb->parts[i].blocks_num) { | |
164 | unsigned long last = | |
165 | (unsigned long)__le32_to_cpu(sb->parts[i].blocks_num) | |
166 | + (unsigned long)__le32_to_cpu(sb->parts[i].first_sect_lba); | |
167 | if (last > info->component_size) | |
168 | info->component_size = last; | |
169 | } | |
170 | ||
171 | } | |
172 | ||
173 | static struct supertype *match_metadata_desc(char *arg) | |
174 | { | |
175 | struct supertype *st = malloc(sizeof(*st)); | |
176 | ||
177 | if (!st) | |
178 | return st; | |
179 | if (strcmp(arg, "mbr") != 0) | |
180 | return NULL; | |
181 | ||
182 | st->ss = &mbr; | |
183 | st->info = NULL; | |
184 | st->minor_version = 0; | |
185 | st->max_devs = 1; | |
186 | st->sb = NULL; | |
187 | return st; | |
188 | } | |
189 | ||
190 | #ifndef MDASSEMBLE | |
191 | static int validate_geometry(struct supertype *st, int level, | |
192 | int layout, int raiddisks, | |
193 | int chunk, unsigned long long size, | |
194 | char *subdev, unsigned long long *freesize, | |
195 | int verbose) | |
196 | { | |
197 | fprintf(stderr, Name ": mbr metadata cannot be used this way\n"); | |
198 | return 0; | |
199 | } | |
200 | #endif | |
201 | ||
202 | struct superswitch mbr = { | |
203 | #ifndef MDASSEMBLE | |
204 | .examine_super = examine_mbr, | |
205 | #endif | |
206 | .validate_geometry = validate_geometry, | |
207 | .match_metadata_desc = match_metadata_desc, | |
208 | .load_super = load_super_mbr, | |
209 | .store_super = store_mbr, | |
210 | .getinfo_super = getinfo_mbr, | |
211 | .free_super = free_mbr, | |
212 | .name = "mbr", | |
213 | }; |