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,
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,