diff options
Diffstat (limited to 'grub-core/disk/mdraid_linux.c')
| -rw-r--r-- | grub-core/disk/mdraid_linux.c | 298 |
1 files changed, 298 insertions, 0 deletions
diff --git a/grub-core/disk/mdraid_linux.c b/grub-core/disk/mdraid_linux.c new file mode 100644 index 0000000..e40216f --- /dev/null +++ b/grub-core/disk/mdraid_linux.c @@ -0,0 +1,298 @@ +/* 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/diskfilter.h> + +/* Linux RAID on disk structures and constants, + copied from include/linux/raid/md_p.h. */ + +GRUB_MOD_LICENSE ("GPLv3+"); + +#ifdef MODE_BIGENDIAN +#define grub_md_to_cpu64 grub_be_to_cpu64 +#define grub_md_to_cpu32 grub_be_to_cpu32 +#define grub_md_to_cpu16 grub_be_to_cpu16 +#define grub_cpu_to_md64_compile_time grub_cpu_to_be64_compile_time +#define grub_cpu_to_md32_compile_time grub_cpu_to_be32_compile_time +#define grub_cpu_to_md16_compile_time grub_cpu_to_be16_compile_time +#else +#define grub_md_to_cpu64 grub_le_to_cpu64 +#define grub_md_to_cpu32 grub_le_to_cpu32 +#define grub_md_to_cpu16 grub_le_to_cpu16 +#define grub_cpu_to_md64_compile_time grub_cpu_to_le64_compile_time +#define grub_cpu_to_md32_compile_time grub_cpu_to_le32_compile_time +#define grub_cpu_to_md16_compile_time grub_cpu_to_le16_compile_time +#endif + +#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; +} GRUB_PACKED; + +static struct grub_diskfilter_vg * +grub_mdraid_detect (grub_disk_t disk, + struct grub_diskfilter_pv_id *id, + grub_disk_addr_t *start_sector) +{ + grub_disk_addr_t sector; + grub_uint64_t size; + struct grub_raid_super_09 *sb = NULL; + grub_uint32_t *uuid; + grub_uint32_t level; + struct grub_diskfilter_vg *ret; + + /* The sector where the mdraid 0.90 superblock is stored, if available. */ + size = grub_disk_native_sectors (disk); + if (size == GRUB_DISK_SIZE_UNKNOWN) + /* not 0.9x raid. */ + return NULL; + sector = NEW_SIZE_SECTORS (size); + + sb = grub_malloc (sizeof (*sb)); + if (!sb) + return NULL; + + if (grub_disk_read (disk, sector, 0, SB_BYTES, sb)) + goto fail; + + /* Look whether there is a mdraid 0.90 superblock. */ + if (sb->md_magic != grub_cpu_to_md32_compile_time (SB_MAGIC)) + /* not 0.9x raid. */ + goto fail; + + if (sb->major_version != grub_cpu_to_md32_compile_time (0) + || sb->minor_version != grub_cpu_to_md32_compile_time (90)) + /* Unsupported version. */ + goto fail; + + /* No need for explicit check that sb->size is 0 (unspecified) since + 0 >= non-0 is false. */ + if (((grub_disk_addr_t) grub_md_to_cpu32 (sb->size)) * 2 >= size) + goto fail; + + /* FIXME: Check the checksum. */ + + level = grub_md_to_cpu32 (sb->level); + /* Multipath. */ + if ((int) level == -4) + level = 1; + + if (level != 0 && level != 1 && level != 4 && + level != 5 && level != 6 && level != 10) + { + grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, + "unsupported RAID level: %d", level); + goto fail; + } + if (grub_md_to_cpu32 (sb->this_disk.number) == 0xffff + || grub_md_to_cpu32 (sb->this_disk.number) == 0xfffe) + /* Spares aren't implemented. */ + goto fail; + + uuid = grub_malloc (16); + if (!uuid) + goto fail; + + 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; + + id->uuidlen = 0; + id->id = grub_md_to_cpu32 (sb->this_disk.number); + + char buf[32]; + grub_snprintf (buf, sizeof (buf), "md%d", grub_md_to_cpu32 (sb->md_minor)); + ret = grub_diskfilter_make_raid (16, (char *) uuid, + grub_md_to_cpu32 (sb->raid_disks), buf, + (sb->size) ? ((grub_disk_addr_t) + grub_md_to_cpu32 (sb->size)) * 2 + : sector, + grub_md_to_cpu32 (sb->chunk_size) >> 9, + grub_md_to_cpu32 (sb->layout), + level); + grub_free (sb); + return ret; + + fail: + grub_free (sb); + return NULL; +} + +static struct grub_diskfilter grub_mdraid_dev = { +#ifdef MODE_BIGENDIAN + .name = "mdraid09_be", +#else + .name = "mdraid09", +#endif + .detect = grub_mdraid_detect, + .next = 0 +}; + +#ifdef MODE_BIGENDIAN +GRUB_MOD_INIT (mdraid09_be) +#else +GRUB_MOD_INIT (mdraid09) +#endif +{ + grub_diskfilter_register_front (&grub_mdraid_dev); +} + +#ifdef MODE_BIGENDIAN +GRUB_MOD_FINI (mdraid09_be) +#else +GRUB_MOD_FINI (mdraid09) +#endif +{ + grub_diskfilter_unregister (&grub_mdraid_dev); +} |