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/*
* mdadm - manage Linux "md" devices aka RAID arrays.
*
* Copyright (C) 2010 Neil Brown <neilb@suse.de>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Neil Brown
* Email: <neil@brown.name>
*
*/
/*
* 'gpt' is a pseudo metadata type for devices which have a
* GPT partition table.
*
* Obviously arrays cannot be created or assembled for this type.
* It is used to allow a new bare device to have an partition table
* added so the member partitions can then be included in other
* arrays as relevant.
*
* The meaning operations are:
* examine_super, but not brief_examine_super or export_examine
* load_super
* store_super
*/
#include "mdadm.h"
#include "part.h"
static void free_gpt(struct supertype *st)
{
free(st->sb);
st->sb = NULL;
}
static void examine_gpt(struct supertype *st, char *homehost)
{
struct GPT *gpt = st->sb + 512;
struct GPT_part_entry *gpe = st->sb + 1024;
unsigned int i;
printf(" GPT Magic : %llx\n", (unsigned long long)__le64_to_cpu(gpt->magic));
printf(" GPT Revision : %ld\n", (long)__le32_to_cpu(gpt->revision));
for (i = 0; i < __le32_to_cpu(gpt->part_cnt); i++) {
printf(" Partition[%02d] : %12llu sectors at %12llu\n",
i,
(unsigned long long)__le64_to_cpu(gpe[i].starting_lba),
(unsigned long long)__le64_to_cpu(gpe[i].ending_lba)-
(unsigned long long)__le64_to_cpu(gpe[i].starting_lba)
+1
);
}
}
static int load_gpt(struct supertype *st, int fd, char *devname)
{
struct MBR *super;
struct GPT *gpt_head;
int to_read;
unsigned int sector_size;
free_gpt(st);
if (posix_memalign((void**)&super, 4096, 32*512) != 0) {
pr_err("could not allocate superblock\n");
return 1;
}
if (!get_dev_sector_size(fd, devname, §or_size)) {
free(super);
return 1;
}
lseek(fd, 0, 0);
if (read(fd, super, sizeof(*super)) != sizeof(*super)) {
no_read:
if (devname)
pr_err("Cannot read partition table on %s\n",
devname);
free(super);
return 1;
}
if (super->magic != MBR_SIGNATURE_MAGIC ||
super->parts[0].part_type != MBR_GPT_PARTITION_TYPE) {
not_found:
if (devname)
pr_err("No partition table found on %s\n",
devname);
free(super);
return 1;
}
/* Set offset to second block (GPT header) */
lseek(fd, sector_size, SEEK_SET);
/* Seem to have GPT, load the header */
gpt_head = (struct GPT*)(super+1);
if (read(fd, gpt_head, sizeof(*gpt_head)) != sizeof(*gpt_head))
goto no_read;
if (gpt_head->magic != GPT_SIGNATURE_MAGIC)
goto not_found;
if (__le32_to_cpu(gpt_head->part_cnt) >= 128)
goto not_found;
to_read = __le32_to_cpu(gpt_head->part_cnt) * sizeof(struct GPT_part_entry);
to_read = ((to_read+511)/512) * 512;
/* Set offset to third block (GPT entries) */
lseek(fd, sector_size*2, SEEK_SET);
if (read(fd, gpt_head+1, to_read) != to_read)
goto no_read;
st->sb = super;
if (st->ss == NULL) {
st->ss = &gpt;
st->minor_version = 0;
st->max_devs = 1;
st->info = NULL;
}
return 0;
}
static int store_gpt(struct supertype *st, int fd)
{
/* FIXME should I save the boot loader */
/* need to write two copies! */
/* FIXME allow for blocks != 512 bytes
*etc
*/
struct MBR *super = st->sb;
struct GPT *gpt;
int to_write;
gpt = (struct GPT*)(super+1);
to_write = __le32_to_cpu(gpt->part_cnt) * sizeof(struct GPT_part_entry);
to_write = ((to_write+511)/512) * 512;
lseek(fd, 0, 0);
if (write(fd, st->sb, to_write) != to_write)
return 4;
fsync(fd);
ioctl(fd, BLKRRPART, 0);
return 0;
}
static void getinfo_gpt(struct supertype *st, struct mdinfo *info, char *map)
{
struct GPT *gpt = st->sb + 512;
struct GPT_part_entry *gpe = st->sb + 1024;
unsigned int i;
memset(&info->array, 0, sizeof(info->array));
memset(&info->disk, 0, sizeof(info->disk));
strcpy(info->text_version, "gpt");
strcpy(info->name, "gpt");
info->component_size = 0;
for (i = 0; i < __le32_to_cpu(gpt->part_cnt); i++) {
unsigned long long last =
(unsigned long long)__le64_to_cpu(gpe[i].ending_lba);
if (last > info->component_size)
info->component_size = last;
}
}
static struct supertype *match_metadata_desc(char *arg)
{
struct supertype *st = xmalloc(sizeof(*st));
if (!st)
return st;
if (strcmp(arg, "gpt") != 0) {
free(st);
return NULL;
}
st->ss = &gpt;
st->info = NULL;
st->minor_version = 0;
st->max_devs = 1;
st->sb = NULL;
return st;
}
static int validate_geometry(struct supertype *st, int level,
int layout, int raiddisks,
int *chunk, unsigned long long size,
unsigned long long data_offset,
char *subdev, unsigned long long *freesize,
int consistency_policy, int verbose)
{
pr_err("gpt metadata cannot be used this way\n");
return 0;
}
struct superswitch gpt = {
.examine_super = examine_gpt,
.validate_geometry = validate_geometry,
.match_metadata_desc = match_metadata_desc,
.load_super = load_gpt,
.store_super = store_gpt,
.getinfo_super = getinfo_gpt,
.free_super = free_gpt,
.name = "gpt",
};
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