]>
git.ipfire.org Git - thirdparty/mdadm.git/blob - super-mbr.c
2 * mdadm - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2010 Neil Brown <neilb@suse.de>
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.
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.
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
22 * Email: <neil@brown.name>
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.
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
36 * The meaning operations are:
37 * examine_super, but not brief_examine_super or export_examine
45 static void free_mbr(struct supertype
*st
)
53 static void examine_mbr(struct supertype
*st
, char *homehost
)
55 struct MBR
*sb
= st
->sb
;
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",
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
);
69 #endif /*MDASSEMBLE */
71 static int load_super_mbr(struct supertype
*st
, int fd
, char *devname
)
77 * 2 record is meaningless
83 if (posix_memalign((void**)&super
, 512, 512) != 0) {
84 pr_err("%s could not allocate superblock\n",
90 if (read(fd
, super
, sizeof(*super
)) != sizeof(*super
)) {
92 pr_err("Cannot read partition table on %s\n",
98 if (super
->magic
!= MBR_SIGNATURE_MAGIC
) {
100 pr_err("No partition table found on %s\n",
108 if (st
->ss
== NULL
) {
110 st
->minor_version
= 0;
117 static int store_mbr(struct supertype
*st
, int fd
)
119 struct MBR
*old
, *super
;
121 if (posix_memalign((void**)&old
, 512, 512) != 0) {
122 pr_err("%s could not allocate superblock\n",
128 if (read(fd
, old
, sizeof(*old
)) != sizeof(*old
)) {
134 memcpy(super
->pad
, old
->pad
, sizeof(super
->pad
));
137 if (write(fd
, super
, sizeof(*super
)) != sizeof(*super
))
140 ioctl(fd
, BLKRRPART
, 0);
144 static void getinfo_mbr(struct supertype
*st
, struct mdinfo
*info
, char *map
)
146 struct MBR
*sb
= st
->sb
;
149 memset(&info
->array
, 0, sizeof(info
->array
));
150 memset(&info
->disk
, 0, sizeof(info
->disk
));
151 strcpy(info
->text_version
, "mbr");
152 strcpy(info
->name
, "mbr");
153 info
->component_size
= 0;
155 for (i
= 0; i
< MBR_PARTITIONS
; i
++)
156 if (sb
->parts
[i
].blocks_num
) {
158 (unsigned long)__le32_to_cpu(sb
->parts
[i
].blocks_num
)
159 + (unsigned long)__le32_to_cpu(sb
->parts
[i
].first_sect_lba
);
160 if (last
> info
->component_size
)
161 info
->component_size
= last
;
166 static struct supertype
*match_metadata_desc(char *arg
)
168 struct supertype
*st
;
170 if (strcmp(arg
, "mbr") != 0)
173 st
= xmalloc(sizeof(*st
));
176 st
->minor_version
= 0;
183 static int validate_geometry(struct supertype
*st
, int level
,
184 int layout
, int raiddisks
,
185 int *chunk
, unsigned long long size
,
186 unsigned long long data_offset
,
187 char *subdev
, unsigned long long *freesize
,
190 pr_err("mbr metadata cannot be used this way\n");
195 struct superswitch mbr
= {
197 .examine_super
= examine_mbr
,
198 .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
,