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/* raid5_recover.c - module to recover from faulty RAID4/5 arrays. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2006,2007,2008 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>
#include <grub/crypto.h>
GRUB_MOD_LICENSE ("GPLv3+");
static grub_err_t
grub_raid5_recover (struct grub_diskfilter_segment *array, int disknr,
char *buf, grub_disk_addr_t sector, grub_size_t size)
{
char *buf2;
int i;
size <<= GRUB_DISK_SECTOR_BITS;
buf2 = grub_malloc (size);
if (!buf2)
return grub_errno;
grub_memset (buf, 0, size);
for (i = 0; i < (int) array->node_count; i++)
{
grub_err_t err;
if (i == disknr)
continue;
err = grub_diskfilter_read_node (&array->nodes[i], sector,
size >> GRUB_DISK_SECTOR_BITS, buf2);
if (err)
{
grub_free (buf2);
return err;
}
grub_crypto_xor (buf, buf, buf2, size);
}
grub_free (buf2);
return GRUB_ERR_NONE;
}
GRUB_MOD_INIT(raid5rec)
{
grub_raid5_recover_func = grub_raid5_recover;
}
GRUB_MOD_FINI(raid5rec)
{
grub_raid5_recover_func = 0;
}
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