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