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/* mdraid_linux.c - module to handle Linux Software RAID. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2008,2009,2010 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/dl.h>
#include <grub/disk.h>
#include <grub/mm.h>
#include <grub/err.h>
#include <grub/misc.h>
#include <grub/raid.h>
/* Linux RAID on disk structures and constants,
copied from include/linux/raid/md_p.h. */
GRUB_MOD_LICENSE ("GPLv3+");
#define RESERVED_BYTES (64 * 1024)
#define RESERVED_SECTORS (RESERVED_BYTES / 512)
#define NEW_SIZE_SECTORS(x) ((x & ~(RESERVED_SECTORS - 1)) \
- RESERVED_SECTORS)
#define SB_BYTES 4096
#define SB_WORDS (SB_BYTES / 4)
#define SB_SECTORS (SB_BYTES / 512)
/*
* The following are counted in 32-bit words
*/
#define SB_GENERIC_OFFSET 0
#define SB_PERSONALITY_OFFSET 64
#define SB_DISKS_OFFSET 128
#define SB_DESCRIPTOR_OFFSET 992
#define SB_GENERIC_CONSTANT_WORDS 32
#define SB_GENERIC_STATE_WORDS 32
#define SB_GENERIC_WORDS (SB_GENERIC_CONSTANT_WORDS + \
SB_GENERIC_STATE_WORDS)
#define SB_PERSONALITY_WORDS 64
#define SB_DESCRIPTOR_WORDS 32
#define SB_DISKS 27
#define SB_DISKS_WORDS (SB_DISKS * SB_DESCRIPTOR_WORDS)
#define SB_RESERVED_WORDS (1024 \
- SB_GENERIC_WORDS \
- SB_PERSONALITY_WORDS \
- SB_DISKS_WORDS \
- SB_DESCRIPTOR_WORDS)
#define SB_EQUAL_WORDS (SB_GENERIC_WORDS \
+ SB_PERSONALITY_WORDS \
+ SB_DISKS_WORDS)
/*
* Device "operational" state bits
*/
#define DISK_FAULTY 0
#define DISK_ACTIVE 1
#define DISK_SYNC 2
#define DISK_REMOVED 3
#define DISK_WRITEMOSTLY 9
#define SB_MAGIC 0xa92b4efc
/*
* Superblock state bits
*/
#define SB_CLEAN 0
#define SB_ERRORS 1
#define SB_BITMAP_PRESENT 8
struct grub_raid_disk_09
{
grub_uint32_t number; /* Device number in the entire set. */
grub_uint32_t major; /* Device major number. */
grub_uint32_t minor; /* Device minor number. */
grub_uint32_t raid_disk; /* The role of the device in the raid set. */
grub_uint32_t state; /* Operational state. */
grub_uint32_t reserved[SB_DESCRIPTOR_WORDS - 5];
};
struct grub_raid_super_09
{
/*
* Constant generic information
*/
grub_uint32_t md_magic; /* MD identifier. */
grub_uint32_t major_version; /* Major version. */
grub_uint32_t minor_version; /* Minor version. */
grub_uint32_t patch_version; /* Patchlevel version. */
grub_uint32_t gvalid_words; /* Number of used words in this section. */
grub_uint32_t set_uuid0; /* Raid set identifier. */
grub_uint32_t ctime; /* Creation time. */
grub_uint32_t level; /* Raid personality. */
grub_uint32_t size; /* Apparent size of each individual disk. */
grub_uint32_t nr_disks; /* Total disks in the raid set. */
grub_uint32_t raid_disks; /* Disks in a fully functional raid set. */
grub_uint32_t md_minor; /* Preferred MD minor device number. */
grub_uint32_t not_persistent; /* Does it have a persistent superblock. */
grub_uint32_t set_uuid1; /* Raid set identifier #2. */
grub_uint32_t set_uuid2; /* Raid set identifier #3. */
grub_uint32_t set_uuid3; /* Raid set identifier #4. */
grub_uint32_t gstate_creserved[SB_GENERIC_CONSTANT_WORDS - 16];
/*
* Generic state information
*/
grub_uint32_t utime; /* Superblock update time. */
grub_uint32_t state; /* State bits (clean, ...). */
grub_uint32_t active_disks; /* Number of currently active disks. */
grub_uint32_t working_disks; /* Number of working disks. */
grub_uint32_t failed_disks; /* Number of failed disks. */
grub_uint32_t spare_disks; /* Number of spare disks. */
grub_uint32_t sb_csum; /* Checksum of the whole superblock. */
grub_uint64_t events; /* Superblock update count. */
grub_uint64_t cp_events; /* Checkpoint update count. */
grub_uint32_t recovery_cp; /* Recovery checkpoint sector count. */
grub_uint32_t gstate_sreserved[SB_GENERIC_STATE_WORDS - 12];
/*
* Personality information
*/
grub_uint32_t layout; /* The array's physical layout. */
grub_uint32_t chunk_size; /* Chunk size in bytes. */
grub_uint32_t root_pv; /* LV root PV. */
grub_uint32_t root_block; /* LV root block. */
grub_uint32_t pstate_reserved[SB_PERSONALITY_WORDS - 4];
/*
* Disks information
*/
struct grub_raid_disk_09 disks[SB_DISKS];
/*
* Reserved
*/
grub_uint32_t reserved[SB_RESERVED_WORDS];
/*
* Active descriptor
*/
struct grub_raid_disk_09 this_disk;
} __attribute__ ((packed));
static grub_err_t
grub_mdraid_detect (grub_disk_t disk, struct grub_raid_array *array,
grub_disk_addr_t *start_sector)
{
grub_disk_addr_t sector;
grub_uint64_t size;
struct grub_raid_super_09 sb;
grub_uint32_t *uuid;
grub_uint32_t level;
/* The sector where the mdraid 0.90 superblock is stored, if available. */
size = grub_disk_get_size (disk);
if (size == GRUB_DISK_SIZE_UNKNOWN)
return grub_error (GRUB_ERR_OUT_OF_RANGE, "not 0.9x raid");
sector = NEW_SIZE_SECTORS (size);
if (grub_disk_read (disk, sector, 0, SB_BYTES, &sb))
return grub_errno;
/* Look whether there is a mdraid 0.90 superblock. */
if (grub_le_to_cpu32 (sb.md_magic) != SB_MAGIC)
return grub_error (GRUB_ERR_OUT_OF_RANGE, "not 0.9x raid");
if (grub_le_to_cpu32 (sb.major_version) != 0
|| grub_le_to_cpu32 (sb.minor_version) != 90)
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
"unsupported RAID version: %d.%d",
grub_le_to_cpu32 (sb.major_version),
grub_le_to_cpu32 (sb.minor_version));
/* FIXME: Check the checksum. */
level = grub_le_to_cpu32 (sb.level);
/* Multipath. */
if ((int) level == -4)
level = 1;
if (level != 0 && level != 1 && level != 4 &&
level != 5 && level != 6 && level != 10)
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
"unsupported RAID level: %d", level);
if (grub_le_to_cpu32 (sb.this_disk.number) == 0xffff
|| grub_le_to_cpu32 (sb.this_disk.number) == 0xfffe)
return grub_error (GRUB_ERR_OUT_OF_RANGE,
"spares aren't implemented");
array->name = NULL;
array->number = grub_le_to_cpu32 (sb.md_minor);
array->level = level;
array->layout = grub_le_to_cpu32 (sb.layout);
array->total_devs = grub_le_to_cpu32 (sb.raid_disks);
array->disk_size = (sb.size) ? grub_le_to_cpu32 (sb.size) * 2 : sector;
array->chunk_size = grub_le_to_cpu32 (sb.chunk_size) >> 9;
array->index = grub_le_to_cpu32 (sb.this_disk.number);
array->uuid_len = 16;
array->uuid = grub_malloc (16);
if (!array->uuid)
return grub_errno;
uuid = (grub_uint32_t *) array->uuid;
uuid[0] = grub_swap_bytes32 (sb.set_uuid0);
uuid[1] = grub_swap_bytes32 (sb.set_uuid1);
uuid[2] = grub_swap_bytes32 (sb.set_uuid2);
uuid[3] = grub_swap_bytes32 (sb.set_uuid3);
*start_sector = 0;
return 0;
}
static struct grub_raid grub_mdraid_dev = {
.name = "mdraid09",
.detect = grub_mdraid_detect,
.next = 0
};
GRUB_MOD_INIT (mdraid09)
{
grub_raid_register (&grub_mdraid_dev);
}
GRUB_MOD_FINI (mdraid09)
{
grub_raid_unregister (&grub_mdraid_dev);
}
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