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)
79 if (posix_memalign((void**)&super, 4096, 32*512) != 0) {
80 pr_err("could not allocate superblock\n");
85 if (read(fd, super, sizeof(*super)) != sizeof(*super)) {
88 pr_err("Cannot read partition table on %s\n",
94 if (super->magic != MBR_SIGNATURE_MAGIC ||
95 super->parts[0].part_type != MBR_GPT_PARTITION_TYPE) {
98 pr_err("No partition table found on %s\n",
103 /* Seem to have GPT, load the header */
104 gpt_head = (struct GPT*)(super+1);
105 if (read(fd, gpt_head, sizeof(*gpt_head)) != sizeof(*gpt_head))
107 if (gpt_head->magic != GPT_SIGNATURE_MAGIC)
109 if (__le32_to_cpu(gpt_head->part_cnt) >= 128)
112 to_read = __le32_to_cpu(gpt_head->part_cnt) * sizeof(struct GPT_part_entry);
113 to_read = ((to_read+511)/512) * 512;
114 if (read(fd, gpt_head+1, to_read) != to_read)
119 if (st->ss == NULL) {
121 st->minor_version = 0;
128 static int store_gpt(struct supertype *st, int fd)
130 /* FIXME should I save the boot loader */
131 /* need to write two copies! */
132 /* FIXME allow for blocks != 512 bytes
135 struct MBR *super = st->sb;
139 gpt = (struct GPT*)(super+1);
141 to_write = __le32_to_cpu(gpt->part_cnt) * sizeof(struct GPT_part_entry);
142 to_write = ((to_write+511)/512) * 512;
145 if (write(fd, st->sb, to_write) != to_write)
149 ioctl(fd, BLKRRPART, 0);
153 static void getinfo_gpt(struct supertype *st, struct mdinfo *info, char *map)
155 struct GPT *gpt = st->sb + 512;
156 struct GPT_part_entry *gpe = st->sb + 1024;
159 memset(&info->array, 0, sizeof(info->array));
160 memset(&info->disk, 0, sizeof(info->disk));
161 strcpy(info->text_version, "gpt");
162 strcpy(info->name, "gpt");
163 info->component_size = 0;
165 for (i = 0; i < __le32_to_cpu(gpt->part_cnt); i++) {
166 unsigned long long last =
167 (unsigned long long)__le64_to_cpu(gpe[i].ending_lba);
168 if (last > info->component_size)
169 info->component_size = last;
173 static struct supertype *match_metadata_desc(char *arg)
175 struct supertype *st = xmalloc(sizeof(*st));
179 if (strcmp(arg, "gpt") != 0) {
186 st->minor_version = 0;
193 static int validate_geometry(struct supertype *st, int level,
194 int layout, int raiddisks,
195 int *chunk, unsigned long long size,
196 unsigned long long data_offset,
197 char *subdev, unsigned long long *freesize,
200 pr_err("gpt metadata cannot be used this way\n");
205 struct superswitch gpt = {
207 .examine_super = examine_gpt,
208 .validate_geometry = validate_geometry,
210 .match_metadata_desc = match_metadata_desc,
211 .load_super = load_gpt,
212 .store_super = store_gpt,
213 .getinfo_super = getinfo_gpt,
214 .free_super = free_gpt,