]>
git.ipfire.org Git - thirdparty/mdadm.git/blob - super-gpt.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 * 'gpt' is a pseudo metadata type for devices which have a
28 * GPT partition table.
30 * Obviously arrays cannot be created or assembled for this type.
31 * It is used to allow a new bare device to have an partition table
32 * added so the member partitions can then be included in other
35 * The meaning operations are:
36 * examine_super, but not brief_examine_super or export_examine
44 static void free_gpt(struct supertype
*st
)
51 static void examine_gpt(struct supertype
*st
, char *homehost
)
53 struct GPT
*gpt
= st
->sb
+ 512;
54 struct GPT_part_entry
*gpe
= st
->sb
+ 1024;
57 printf(" GPT Magic : %llx\n", (unsigned long long)__le64_to_cpu(gpt
->magic
));
58 printf(" GPT Revision : %ld\n", (long)__le32_to_cpu(gpt
->revision
));
59 for (i
= 0; i
< __le32_to_cpu(gpt
->part_cnt
); i
++) {
60 printf(" Partition[%02d] : %12llu sectors at %12llu\n",
62 (unsigned long long)__le64_to_cpu(gpe
[i
].starting_lba
),
63 (unsigned long long)__le64_to_cpu(gpe
[i
].ending_lba
)-
64 (unsigned long long)__le64_to_cpu(gpe
[i
].starting_lba
)
69 #endif /* MDASSEMBLE */
71 static int load_gpt(struct supertype
*st
, int fd
, char *devname
)
76 unsigned int sector_size
;
80 if (posix_memalign((void**)&super
, 4096, 32*512) != 0) {
81 pr_err("could not allocate superblock\n");
85 if (!get_dev_sector_size(fd
, devname
, §or_size
)) {
91 if (read(fd
, super
, sizeof(*super
)) != sizeof(*super
)) {
94 pr_err("Cannot read partition table on %s\n",
100 if (super
->magic
!= MBR_SIGNATURE_MAGIC
||
101 super
->parts
[0].part_type
!= MBR_GPT_PARTITION_TYPE
) {
104 pr_err("No partition table found on %s\n",
109 /* Set offset to second block (GPT header) */
110 lseek(fd
, sector_size
, SEEK_SET
);
111 /* Seem to have GPT, load the header */
112 gpt_head
= (struct GPT
*)(super
+1);
113 if (read(fd
, gpt_head
, sizeof(*gpt_head
)) != sizeof(*gpt_head
))
115 if (gpt_head
->magic
!= GPT_SIGNATURE_MAGIC
)
117 if (__le32_to_cpu(gpt_head
->part_cnt
) >= 128)
120 to_read
= __le32_to_cpu(gpt_head
->part_cnt
) * sizeof(struct GPT_part_entry
);
121 to_read
= ((to_read
+511)/512) * 512;
122 /* Set offset to third block (GPT entries) */
123 lseek(fd
, sector_size
*2, SEEK_SET
);
124 if (read(fd
, gpt_head
+1, to_read
) != to_read
)
129 if (st
->ss
== NULL
) {
131 st
->minor_version
= 0;
138 static int store_gpt(struct supertype
*st
, int fd
)
140 /* FIXME should I save the boot loader */
141 /* need to write two copies! */
142 /* FIXME allow for blocks != 512 bytes
145 struct MBR
*super
= st
->sb
;
149 gpt
= (struct GPT
*)(super
+1);
151 to_write
= __le32_to_cpu(gpt
->part_cnt
) * sizeof(struct GPT_part_entry
);
152 to_write
= ((to_write
+511)/512) * 512;
155 if (write(fd
, st
->sb
, to_write
) != to_write
)
159 ioctl(fd
, BLKRRPART
, 0);
163 static void getinfo_gpt(struct supertype
*st
, struct mdinfo
*info
, char *map
)
165 struct GPT
*gpt
= st
->sb
+ 512;
166 struct GPT_part_entry
*gpe
= st
->sb
+ 1024;
169 memset(&info
->array
, 0, sizeof(info
->array
));
170 memset(&info
->disk
, 0, sizeof(info
->disk
));
171 strcpy(info
->text_version
, "gpt");
172 strcpy(info
->name
, "gpt");
173 info
->component_size
= 0;
175 for (i
= 0; i
< __le32_to_cpu(gpt
->part_cnt
); i
++) {
176 unsigned long long last
=
177 (unsigned long long)__le64_to_cpu(gpe
[i
].ending_lba
);
178 if (last
> info
->component_size
)
179 info
->component_size
= last
;
183 static struct supertype
*match_metadata_desc(char *arg
)
185 struct supertype
*st
= xmalloc(sizeof(*st
));
189 if (strcmp(arg
, "gpt") != 0) {
196 st
->minor_version
= 0;
203 static int validate_geometry(struct supertype
*st
, int level
,
204 int layout
, int raiddisks
,
205 int *chunk
, unsigned long long size
,
206 unsigned long long data_offset
,
207 char *subdev
, unsigned long long *freesize
,
208 int consistency_policy
, int verbose
)
210 pr_err("gpt metadata cannot be used this way\n");
215 struct superswitch gpt
= {
217 .examine_super
= examine_gpt
,
218 .validate_geometry
= validate_geometry
,
220 .match_metadata_desc
= match_metadata_desc
,
221 .load_super
= load_gpt
,
222 .store_super
= store_gpt
,
223 .getinfo_super
= getinfo_gpt
,
224 .free_super
= free_gpt
,