arch/all-pc/boot/grub2-aros/grub-core/disk/raid5_recover.c

   1 /* raid5_recover.c - module to recover from faulty RAID4/5 arrays.  */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2006,2007,2008  Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <grub/dl.h>
  21 #include <grub/disk.h>
  22 #include <grub/mm.h>
  23 #include <grub/err.h>
  24 #include <grub/misc.h>
  25 #include <grub/diskfilter.h>
  26 #include <grub/crypto.h>
  27
  28 GRUB_MOD_LICENSE ("GPLv3+");
  29
  30 static grub_err_t
  31 grub_raid5_recover (struct grub_diskfilter_segment *array, int disknr,
  32                     char *buf, grub_disk_addr_t sector, grub_size_t size)
  33 {
  34   char *buf2;
  35   int i;
  36
  37   size <<= GRUB_DISK_SECTOR_BITS;
  38   buf2 = grub_malloc (size);
  39   if (!buf2)
  40     return grub_errno;
  41
  42   grub_memset (buf, 0, size);
  43
  44   for (i = 0; i < (int) array->node_count; i++)
  45     {
  46       grub_err_t err;
  47
  48       if (i == disknr)
  49         continue;
  50
  51       err = grub_diskfilter_read_node (&array->nodes[i], sector,
  52                                        size >> GRUB_DISK_SECTOR_BITS, buf2);
  53
  54       if (err)
  55         {
  56           grub_free (buf2);
  57           return err;
  58         }
  59
  60       grub_crypto_xor (buf, buf, buf2, size);
  61     }
  62
  63   grub_free (buf2);
  64
  65   return GRUB_ERR_NONE;
  66 }
  67
  68 GRUB_MOD_INIT(raid5rec)
  69 {
  70   grub_raid5_recover_func = grub_raid5_recover;
  71 }
  72
  73 GRUB_MOD_FINI(raid5rec)
  74 {
  75   grub_raid5_recover_func = 0;
  76 }