240 lines
7.9 KiB
C
240 lines
7.9 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 SB_MAGIC 0xa92b4efc
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/*
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* The version-1 superblock :
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* All numeric fields are little-endian.
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*
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* Total size: 256 bytes plus 2 per device.
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* 1K allows 384 devices.
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*/
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struct grub_raid_super_1x
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{
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/* Constant array information - 128 bytes. */
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grub_uint32_t magic; /* MD_SB_MAGIC: 0xa92b4efc - little endian. */
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grub_uint32_t major_version; /* 1. */
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grub_uint32_t feature_map; /* Bit 0 set if 'bitmap_offset' is meaningful. */
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grub_uint32_t pad0; /* Always set to 0 when writing. */
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grub_uint8_t set_uuid[16]; /* User-space generated. */
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char set_name[32]; /* Set and interpreted by user-space. */
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grub_uint64_t ctime; /* Lo 40 bits are seconds, top 24 are microseconds or 0. */
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grub_uint32_t level; /* -4 (multipath), -1 (linear), 0,1,4,5. */
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grub_uint32_t layout; /* only for raid5 and raid10 currently. */
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grub_uint64_t size; /* Used size of component devices, in 512byte sectors. */
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grub_uint32_t chunksize; /* In 512byte sectors. */
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grub_uint32_t raid_disks;
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grub_uint32_t bitmap_offset; /* Sectors after start of superblock that bitmap starts
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* NOTE: signed, so bitmap can be before superblock
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* only meaningful of feature_map[0] is set.
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*/
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/* These are only valid with feature bit '4'. */
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grub_uint32_t new_level; /* New level we are reshaping to. */
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grub_uint64_t reshape_position; /* Next address in array-space for reshape. */
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grub_uint32_t delta_disks; /* Change in number of raid_disks. */
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grub_uint32_t new_layout; /* New layout. */
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grub_uint32_t new_chunk; /* New chunk size (512byte sectors). */
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grub_uint8_t pad1[128 - 124]; /* Set to 0 when written. */
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/* Constant this-device information - 64 bytes. */
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grub_uint64_t data_offset; /* Sector start of data, often 0. */
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grub_uint64_t data_size; /* Sectors in this device that can be used for data. */
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grub_uint64_t super_offset; /* Sector start of this superblock. */
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grub_uint64_t recovery_offset; /* Sectors before this offset (from data_offset) have been recovered. */
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grub_uint32_t dev_number; /* Permanent identifier of this device - not role in raid. */
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grub_uint32_t cnt_corrected_read; /* Number of read errors that were corrected by re-writing. */
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grub_uint8_t device_uuid[16]; /* User-space setable, ignored by kernel. */
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grub_uint8_t devflags; /* Per-device flags. Only one defined... */
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grub_uint8_t pad2[64 - 57]; /* Set to 0 when writing. */
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/* Array state information - 64 bytes. */
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grub_uint64_t utime; /* 40 bits second, 24 btes microseconds. */
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grub_uint64_t events; /* Incremented when superblock updated. */
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grub_uint64_t resync_offset; /* Data before this offset (from data_offset) known to be in sync. */
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grub_uint32_t sb_csum; /* Checksum upto devs[max_dev]. */
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grub_uint32_t max_dev; /* Size of devs[] array to consider. */
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grub_uint8_t pad3[64 - 32]; /* Set to 0 when writing. */
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/* Device state information. Indexed by dev_number.
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* 2 bytes per device.
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* Note there are no per-device state flags. State information is rolled
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* into the 'roles' value. If a device is spare or faulty, then it doesn't
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* have a meaningful role.
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*/
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grub_uint16_t dev_roles[0]; /* Role in array, or 0xffff for a spare, or 0xfffe for faulty. */
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};
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/* Could be __attribute__ ((packed)), but since all members in this struct
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are already appropriately aligned, we can omit this and avoid suboptimal
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assembly in some cases. */
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#define WriteMostly1 1 /* Mask for writemostly flag in above devflags. */
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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 = 0;
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grub_uint64_t size;
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struct grub_raid_super_1x sb;
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grub_uint8_t minor_version;
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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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/* Check for an 1.x superblock.
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* It's always aligned to a 4K boundary
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* and depending on the minor version it can be:
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* 0: At least 8K, but less than 12K, from end of device
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* 1: At start of device
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* 2: 4K from start of device.
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*/
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for (minor_version = 0; minor_version < 3; ++minor_version)
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{
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if (size == GRUB_DISK_SIZE_UNKNOWN && minor_version == 0)
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continue;
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switch (minor_version)
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{
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case 0:
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sector = (size - 8 * 2) & ~(4 * 2 - 1);
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break;
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case 1:
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sector = 0;
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break;
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case 2:
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sector = 4 * 2;
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break;
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}
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if (grub_disk_read (disk, sector, 0, sizeof (struct grub_raid_super_1x),
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&sb))
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return grub_errno;
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if (grub_le_to_cpu32 (sb.magic) != SB_MAGIC
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|| grub_le_to_cpu64 (sb.super_offset) != sector)
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continue;
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{
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grub_uint64_t sb_size;
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struct grub_raid_super_1x *real_sb;
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grub_uint32_t level;
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if (grub_le_to_cpu32 (sb.major_version) != 1)
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return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
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"Unsupported RAID version: %d",
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grub_le_to_cpu32 (sb.major_version));
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level = grub_le_to_cpu32 (sb.level);
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/* Multipath. */
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if ((int) level == -4)
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level = 1;
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if (level != 0 && level != 1 && level != 4 &&
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level != 5 && level != 6 && 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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/* 1.x superblocks don't have a fixed size on disk. So we have to
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read it again now that we now the max device count. */
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sb_size = sizeof (struct grub_raid_super_1x)
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+ 2 * grub_le_to_cpu32 (sb.max_dev);
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real_sb = grub_malloc (sb_size);
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if (! real_sb)
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return grub_errno;
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if (grub_disk_read (disk, sector, 0, sb_size, real_sb))
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{
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grub_free (real_sb);
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return grub_errno;
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}
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array->name = grub_strdup (real_sb->set_name);
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if (! array->name)
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{
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grub_free (real_sb);
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return grub_errno;
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}
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array->number = 0;
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array->level = grub_le_to_cpu32 (real_sb->level);
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array->layout = grub_le_to_cpu32 (real_sb->layout);
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array->total_devs = grub_le_to_cpu32 (real_sb->raid_disks);
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array->disk_size = grub_le_to_cpu64 (real_sb->size);
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array->chunk_size = grub_le_to_cpu32 (real_sb->chunksize);
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if (grub_le_to_cpu32 (real_sb->dev_number) >=
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grub_le_to_cpu32 (real_sb->max_dev))
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return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
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"spares aren't implemented");
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array->index = grub_le_to_cpu16
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(real_sb->dev_roles[grub_le_to_cpu32 (real_sb->dev_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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{
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grub_free (real_sb);
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return grub_errno;
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}
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grub_memcpy (array->uuid, real_sb->set_uuid, 16);
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*start_sector = grub_le_to_cpu64 (real_sb->data_offset);
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grub_free (real_sb);
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return 0;
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}
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}
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return grub_error (GRUB_ERR_OUT_OF_RANGE, "not 1.x raid");
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}
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static struct grub_raid grub_mdraid_dev = {
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.name = "mdraid1x",
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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 (mdraid1x)
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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 (mdraid1x)
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{
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grub_raid_unregister (&grub_mdraid_dev);
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}
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