691 lines
17 KiB
C
691 lines
17 KiB
C
/* raid.c - module to read RAID arrays. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2006,2007,2008,2009 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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/* Linked list of RAID arrays. */
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static struct grub_raid_array *array_list;
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grub_raid5_recover_func_t grub_raid5_recover_func;
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grub_raid6_recover_func_t grub_raid6_recover_func;
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static char
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grub_is_array_readable (struct grub_raid_array *array)
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{
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switch (array->level)
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{
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case 0:
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if (array->nr_devs == array->total_devs)
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return 1;
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break;
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case 1:
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if (array->nr_devs >= 1)
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return 1;
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break;
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case 4:
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case 5:
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case 6:
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case 10:
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{
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unsigned int n;
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if (array->level == 10)
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{
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n = array->layout & 0xFF;
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if (n == 1)
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n = (array->layout >> 8) & 0xFF;
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n--;
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}
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else
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n = array->level / 3;
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if (array->nr_devs >= array->total_devs - n)
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return 1;
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break;
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}
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}
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return 0;
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}
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static int
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grub_raid_iterate (int (*hook) (const char *name))
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{
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struct grub_raid_array *array;
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for (array = array_list; array != NULL; array = array->next)
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{
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if (grub_is_array_readable (array))
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if (hook (array->name))
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return 1;
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}
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return 0;
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}
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#ifdef GRUB_UTIL
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static grub_disk_memberlist_t
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grub_raid_memberlist (grub_disk_t disk)
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{
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struct grub_raid_array *array = disk->data;
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grub_disk_memberlist_t list = NULL, tmp;
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unsigned int i;
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for (i = 0; i < array->total_devs; i++)
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if (array->device[i])
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{
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tmp = grub_malloc (sizeof (*tmp));
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tmp->disk = array->device[i];
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tmp->next = list;
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list = tmp;
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}
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return list;
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}
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#endif
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static grub_err_t
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grub_raid_open (const char *name, grub_disk_t disk)
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{
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struct grub_raid_array *array;
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unsigned n;
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for (array = array_list; array != NULL; array = array->next)
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{
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if (!grub_strcmp (array->name, name))
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if (grub_is_array_readable (array))
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break;
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}
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if (!array)
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return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "unknown RAID device %s",
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name);
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disk->has_partitions = 1;
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disk->id = array->number;
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disk->data = array;
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grub_dprintf ("raid", "%s: total_devs=%d, disk_size=%lld\n", name,
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array->total_devs, (unsigned long long) array->disk_size);
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switch (array->level)
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{
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case 1:
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disk->total_sectors = array->disk_size;
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break;
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case 10:
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n = array->layout & 0xFF;
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if (n == 1)
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n = (array->layout >> 8) & 0xFF;
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disk->total_sectors = grub_divmod64 (array->total_devs *
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array->disk_size,
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n, 0);
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break;
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case 0:
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case 4:
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case 5:
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case 6:
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n = array->level / 3;
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disk->total_sectors = (array->total_devs - n) * array->disk_size;
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break;
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}
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grub_dprintf ("raid", "%s: level=%d, total_sectors=%lld\n", name,
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array->level, (unsigned long long) disk->total_sectors);
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return 0;
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}
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static void
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grub_raid_close (grub_disk_t disk __attribute ((unused)))
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{
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return;
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}
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void
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grub_raid_block_xor (char *buf1, const char *buf2, int size)
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{
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grub_size_t *p1;
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const grub_size_t *p2;
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p1 = (grub_size_t *) buf1;
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p2 = (const grub_size_t *) buf2;
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size /= GRUB_CPU_SIZEOF_VOID_P;
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while (size)
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{
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*(p1++) ^= *(p2++);
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size--;
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}
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}
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static grub_err_t
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grub_raid_read (grub_disk_t disk, grub_disk_addr_t sector,
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grub_size_t size, char *buf)
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{
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struct grub_raid_array *array = disk->data;
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grub_err_t err = 0;
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switch (array->level)
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{
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case 0:
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case 1:
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case 10:
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{
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grub_disk_addr_t read_sector, far_ofs;
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grub_uint32_t disknr, b, near, far, ofs;
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read_sector = grub_divmod64 (sector, array->chunk_size, &b);
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far = ofs = near = 1;
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far_ofs = 0;
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if (array->level == 1)
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near = array->total_devs;
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else if (array->level == 10)
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{
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near = array->layout & 0xFF;
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far = (array->layout >> 8) & 0xFF;
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if (array->layout >> 16)
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{
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ofs = far;
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far_ofs = 1;
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}
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else
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far_ofs = grub_divmod64 (array->disk_size,
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far * array->chunk_size, 0);
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far_ofs *= array->chunk_size;
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}
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read_sector = grub_divmod64 (read_sector * near, array->total_devs,
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&disknr);
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ofs *= array->chunk_size;
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read_sector *= ofs;
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while (1)
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{
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grub_size_t read_size;
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unsigned int i, j;
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read_size = array->chunk_size - b;
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if (read_size > size)
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read_size = size;
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for (i = 0; i < near; i++)
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{
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unsigned int k;
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k = disknr;
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for (j = 0; j < far; j++)
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{
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if (array->device[k])
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{
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if (grub_errno == GRUB_ERR_READ_ERROR)
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grub_errno = GRUB_ERR_NONE;
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err = grub_disk_read (array->device[k],
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read_sector + j * far_ofs + b,
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0,
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read_size << GRUB_DISK_SECTOR_BITS,
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buf);
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if (! err)
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break;
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else if (err != GRUB_ERR_READ_ERROR)
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return err;
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}
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else
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err = grub_error (GRUB_ERR_READ_ERROR,
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"disk missing");
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k++;
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if (k == array->total_devs)
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k = 0;
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}
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if (! err)
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break;
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disknr++;
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if (disknr == array->total_devs)
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{
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disknr = 0;
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read_sector += ofs;
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}
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}
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if (err)
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return err;
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buf += read_size << GRUB_DISK_SECTOR_BITS;
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size -= read_size;
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if (! size)
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break;
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b = 0;
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disknr += (near - i);
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while (disknr >= array->total_devs)
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{
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disknr -= array->total_devs;
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read_sector += ofs;
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}
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}
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break;
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}
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case 4:
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case 5:
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case 6:
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{
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grub_disk_addr_t read_sector;
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grub_uint32_t b, p, n, disknr, e;
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/* n = 1 for level 4 and 5, 2 for level 6. */
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n = array->level / 3;
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/* Find the first sector to read. */
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read_sector = grub_divmod64 (sector, array->chunk_size, &b);
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read_sector = grub_divmod64 (read_sector, array->total_devs - n,
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&disknr);
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if (array->level >= 5)
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{
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grub_divmod64 (read_sector, array->total_devs, &p);
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if (! (array->layout & GRUB_RAID_LAYOUT_RIGHT_MASK))
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p = array->total_devs - 1 - p;
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if (array->layout & GRUB_RAID_LAYOUT_SYMMETRIC_MASK)
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{
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disknr += p + n;
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}
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else
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{
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grub_uint32_t q;
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q = p + (n - 1);
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if (q >= array->total_devs)
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q -= array->total_devs;
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if (disknr >= p)
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disknr += n;
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else if (disknr >= q)
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disknr += q + 1;
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}
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if (disknr >= array->total_devs)
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disknr -= array->total_devs;
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}
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else
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p = array->total_devs - n;
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read_sector *= array->chunk_size;
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while (1)
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{
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grub_size_t read_size;
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int next_level;
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read_size = array->chunk_size - b;
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if (read_size > size)
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read_size = size;
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e = 0;
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if (array->device[disknr])
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{
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/* Reset read error. */
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if (grub_errno == GRUB_ERR_READ_ERROR)
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grub_errno = GRUB_ERR_NONE;
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err = grub_disk_read (array->device[disknr],
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read_sector + b, 0,
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read_size << GRUB_DISK_SECTOR_BITS,
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buf);
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if ((err) && (err != GRUB_ERR_READ_ERROR))
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break;
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e++;
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}
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else
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err = GRUB_ERR_READ_ERROR;
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if (err)
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{
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if (array->nr_devs < array->total_devs - n + e)
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break;
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grub_errno = GRUB_ERR_NONE;
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if (array->level == 6)
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{
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err = ((grub_raid6_recover_func) ?
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(*grub_raid6_recover_func) (array, disknr, p,
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buf, read_sector + b,
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read_size) :
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grub_error (GRUB_ERR_BAD_DEVICE,
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"raid6rec is not loaded"));
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}
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else
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{
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err = ((grub_raid5_recover_func) ?
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(*grub_raid5_recover_func) (array, disknr,
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buf, read_sector + b,
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read_size) :
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grub_error (GRUB_ERR_BAD_DEVICE,
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"raid5rec is not loaded"));
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}
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if (err)
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break;
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}
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buf += read_size << GRUB_DISK_SECTOR_BITS;
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size -= read_size;
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if (! size)
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break;
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b = 0;
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disknr++;
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if (array->layout & GRUB_RAID_LAYOUT_SYMMETRIC_MASK)
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{
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if (disknr == array->total_devs)
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disknr = 0;
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next_level = (disknr == p);
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}
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else
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{
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if (disknr == p)
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disknr += n;
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next_level = (disknr >= array->total_devs);
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}
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if (next_level)
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{
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read_sector += array->chunk_size;
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if (array->level >= 5)
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{
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if (array->layout & GRUB_RAID_LAYOUT_RIGHT_MASK)
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p = (p == array->total_devs - 1) ? 0 : p + 1;
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else
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p = (p == 0) ? array->total_devs - 1 : p - 1;
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if (array->layout & GRUB_RAID_LAYOUT_SYMMETRIC_MASK)
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{
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disknr = p + n;
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if (disknr >= array->total_devs)
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disknr -= array->total_devs;
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}
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else
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{
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disknr -= array->total_devs;
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if (disknr == p)
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disknr += n;
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}
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}
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else
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disknr = 0;
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}
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}
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}
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break;
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}
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return err;
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}
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static grub_err_t
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grub_raid_write (grub_disk_t disk __attribute ((unused)),
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grub_disk_addr_t sector __attribute ((unused)),
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grub_size_t size __attribute ((unused)),
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const char *buf __attribute ((unused)))
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{
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return GRUB_ERR_NOT_IMPLEMENTED_YET;
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}
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static grub_err_t
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insert_array (grub_disk_t disk, struct grub_raid_array *new_array,
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const char *scanner_name)
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{
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struct grub_raid_array *array = 0, *p;
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/* See whether the device is part of an array we have already seen a
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device from. */
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for (p = array_list; p != NULL; p = p->next)
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if ((p->uuid_len == new_array->uuid_len) &&
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(! grub_memcmp (p->uuid, new_array->uuid, p->uuid_len)))
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{
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grub_free (new_array->uuid);
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array = p;
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/* Do some checks before adding the device to the array. */
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/* FIXME: Check whether the update time of the superblocks are
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the same. */
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if (array->total_devs == array->nr_devs)
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/* We found more members of the array than the array
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actually has according to its superblock. This shouldn't
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happen normally. */
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grub_dprintf ("raid", "array->nr_devs > array->total_devs (%d)?!?",
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array->total_devs);
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if (array->device[new_array->index] != NULL)
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/* We found multiple devices with the same number. Again,
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this shouldn't happen.*/
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grub_dprintf ("raid", "Found two disks with the number %d?!?",
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new_array->number);
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if (new_array->disk_size < array->disk_size)
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array->disk_size = new_array->disk_size;
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break;
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}
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/* Add an array to the list if we didn't find any. */
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if (!array)
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{
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array = grub_malloc (sizeof (*array));
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if (!array)
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{
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grub_free (new_array->uuid);
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return grub_errno;
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}
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*array = *new_array;
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array->nr_devs = 0;
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grub_memset (&array->device, 0, sizeof (array->device));
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/* Check whether we don't have multiple arrays with the same number. */
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for (p = array_list; p != NULL; p = p->next)
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{
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if (p->number == array->number)
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break;
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}
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if (p)
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{
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/* The number is already in use, so we need to find an new number. */
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int i = 0;
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while (1)
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{
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for (p = array_list; p != NULL; p = p->next)
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{
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if (p->number == i)
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break;
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}
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if (!p)
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{
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/* We found an unused number. */
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array->number = i;
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break;
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}
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i++;
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}
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}
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array->name = grub_xasprintf ("md%d", array->number);
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if (! array->name)
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{
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grub_free (array->uuid);
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grub_free (array);
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return grub_errno;
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}
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grub_dprintf ("raid", "Found array %s (%s)\n", array->name,
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scanner_name);
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/* Add our new array to the list. */
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array->next = array_list;
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array_list = array;
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/* RAID 1 doesn't use a chunksize but code assumes one so set
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one. */
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if (array->level == 1)
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array->chunk_size = 64;
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}
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/* Add the device to the array. */
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array->device[new_array->index] = disk;
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array->nr_devs++;
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return 0;
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}
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static grub_raid_t grub_raid_list;
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static void
|
||
free_array (void)
|
||
{
|
||
struct grub_raid_array *array;
|
||
|
||
array = array_list;
|
||
while (array)
|
||
{
|
||
struct grub_raid_array *p;
|
||
int i;
|
||
|
||
p = array;
|
||
array = array->next;
|
||
|
||
for (i = 0; i < GRUB_RAID_MAX_DEVICES; i++)
|
||
if (p->device[i])
|
||
grub_disk_close (p->device[i]);
|
||
|
||
grub_free (p->uuid);
|
||
grub_free (p->name);
|
||
grub_free (p);
|
||
}
|
||
|
||
array_list = 0;
|
||
}
|
||
|
||
void
|
||
grub_raid_register (grub_raid_t raid)
|
||
{
|
||
auto int hook (const char *name);
|
||
int hook (const char *name)
|
||
{
|
||
grub_disk_t disk;
|
||
struct grub_raid_array array;
|
||
|
||
grub_dprintf ("raid", "Scanning for RAID devices on disk %s\n", name);
|
||
|
||
disk = grub_disk_open (name);
|
||
if (!disk)
|
||
return 0;
|
||
|
||
if ((disk->total_sectors != GRUB_ULONG_MAX) &&
|
||
(! grub_raid_list->detect (disk, &array)) &&
|
||
(! insert_array (disk, &array, grub_raid_list->name)))
|
||
return 0;
|
||
|
||
/* This error usually means it's not raid, no need to display
|
||
it. */
|
||
if (grub_errno != GRUB_ERR_OUT_OF_RANGE)
|
||
grub_print_error ();
|
||
|
||
grub_errno = GRUB_ERR_NONE;
|
||
|
||
grub_disk_close (disk);
|
||
|
||
return 0;
|
||
}
|
||
|
||
raid->next = grub_raid_list;
|
||
grub_raid_list = raid;
|
||
grub_device_iterate (&hook);
|
||
}
|
||
|
||
void
|
||
grub_raid_unregister (grub_raid_t raid)
|
||
{
|
||
grub_raid_t *p, q;
|
||
|
||
for (p = &grub_raid_list, q = *p; q; p = &(q->next), q = q->next)
|
||
if (q == raid)
|
||
{
|
||
*p = q->next;
|
||
break;
|
||
}
|
||
}
|
||
|
||
static struct grub_disk_dev grub_raid_dev =
|
||
{
|
||
.name = "raid",
|
||
.id = GRUB_DISK_DEVICE_RAID_ID,
|
||
.iterate = grub_raid_iterate,
|
||
.open = grub_raid_open,
|
||
.close = grub_raid_close,
|
||
.read = grub_raid_read,
|
||
.write = grub_raid_write,
|
||
#ifdef GRUB_UTIL
|
||
.memberlist = grub_raid_memberlist,
|
||
#endif
|
||
.next = 0
|
||
};
|
||
|
||
|
||
GRUB_MOD_INIT(raid)
|
||
{
|
||
grub_disk_dev_register (&grub_raid_dev);
|
||
}
|
||
|
||
GRUB_MOD_FINI(raid)
|
||
{
|
||
grub_disk_dev_unregister (&grub_raid_dev);
|
||
free_array ();
|
||
}
|