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73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
/* raid5_recover.c - module to recover from faulty RAID4/5 arrays. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2006,2007,2008 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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static grub_err_t
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grub_raid5_recover (struct grub_raid_array *array, int disknr,
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char *buf, grub_disk_addr_t sector, int size)
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{
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char *buf2;
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int i;
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size <<= GRUB_DISK_SECTOR_BITS;
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buf2 = grub_malloc (size);
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if (!buf2)
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return grub_errno;
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grub_memset (buf, 0, size);
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for (i = 0; i < (int) array->total_devs; i++)
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{
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grub_err_t err;
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if (i == disknr)
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continue;
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err = grub_disk_read (array->device[i], sector, 0, size, buf2);
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if (err)
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{
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grub_free (buf2);
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return err;
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}
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grub_raid_block_xor (buf, buf2, size);
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}
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grub_free (buf2);
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return GRUB_ERR_NONE;
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}
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GRUB_MOD_INIT(raid5rec)
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{
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grub_raid5_recover_func = grub_raid5_recover;
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}
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GRUB_MOD_FINI(raid5rec)
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{
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grub_raid5_recover_func = 0;
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}
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