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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>
*
*/
/*
* 'mbr' is a pseudo metadata type for devices which have a
* partition table in the Master Boot Record (mbr) also known
* as a dos 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"
#include "xmalloc.h"
static void free_mbr(struct supertype *st)
{
free(st->sb);
st->sb = NULL;
}
static void examine_mbr(struct supertype *st, char *homehost)
{
struct MBR *sb = st->sb;
int i;
printf(" MBR Magic : %04x\n", sb->magic);
for (i = 0; i < MBR_PARTITIONS; i++)
/*
* Have to make every access through sb rather than using a
* pointer to the partition table (or an entry), since the
* entries are not properly aligned.
*/
if (sb->parts[i].blocks_num)
printf("Partition[%d] : %12lu sectors at %12lu (type %02x)\n",
i,
(unsigned long)__le32_to_cpu(sb->parts[i].blocks_num),
(unsigned long)__le32_to_cpu(sb->parts[i].first_sect_lba),
sb->parts[i].part_type);
}
static int load_super_mbr(struct supertype *st, int fd, char *devname)
{
/* try to read an mbr
* Return
* 0 on success
* 1 cannot get record
* 2 record is meaningless
*/
struct MBR *super;
free_mbr(st);
if (posix_memalign((void**)&super, 512, 512) != 0) {
pr_err("could not allocate superblock\n");
return 1;
}
lseek(fd, 0, 0);
if (read(fd, super, sizeof(*super)) != sizeof(*super)) {
if (devname)
pr_err("Cannot read partition table on %s\n",
devname);
free(super);
return 1;
}
if (super->magic != MBR_SIGNATURE_MAGIC) {
if (devname)
pr_err("No partition table found on %s\n",
devname);
free(super);
return 1;
}
st->sb = super;
if (st->ss == NULL) {
st->ss = &mbr;
st->minor_version = 0;
st->max_devs = 1;
st->info = NULL;
}
return 0;
}
static int store_mbr(struct supertype *st, int fd)
{
struct MBR *old, *super;
if (posix_memalign((void**)&old, 512, 512) != 0) {
pr_err("could not allocate superblock\n");
return 1;
}
lseek(fd, 0, 0);
if (read(fd, old, sizeof(*old)) != sizeof(*old)) {
free(old);
return 1;
}
super = st->sb;
memcpy(super->pad, old->pad, sizeof(super->pad));
free(old);
lseek(fd, 0, 0);
if (write(fd, super, sizeof(*super)) != sizeof(*super))
return 4;
fsync(fd);
ioctl(fd, BLKRRPART, 0);
return 0;
}
static void getinfo_mbr(struct supertype *st, struct mdinfo *info, char *map)
{
struct MBR *sb = st->sb;
int i;
memset(&info->array, 0, sizeof(info->array));
memset(&info->disk, 0, sizeof(info->disk));
strcpy(info->text_version, "mbr");
strcpy(info->name, "mbr");
info->component_size = 0;
for (i = 0; i < MBR_PARTITIONS ; i++)
/*
* Have to make every access through sb rather than using a
* pointer to the partition table (or an entry), since the
* entries are not properly aligned.
*/
if (sb->parts[i].blocks_num) {
unsigned long last =
(unsigned long)__le32_to_cpu(sb->parts[i].blocks_num)
+ (unsigned long)__le32_to_cpu(sb->parts[i].first_sect_lba);
if (last > info->component_size)
info->component_size = last;
}
}
static struct supertype *match_metadata_desc(char *arg)
{
struct supertype *st;
if (strcmp(arg, "mbr") != 0)
return NULL;
st = xmalloc(sizeof(*st));
st->ss = &mbr;
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("mbr metadata cannot be used this way\n");
return 0;
}
struct superswitch mbr = {
.examine_super = examine_mbr,
.validate_geometry = validate_geometry,
.match_metadata_desc = match_metadata_desc,
.load_super = load_super_mbr,
.store_super = store_mbr,
.getinfo_super = getinfo_mbr,
.free_super = free_mbr,
.name = "mbr",
};
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