forked from Mirrors/btrfs-progs
59 lines
2.0 KiB
C
59 lines
2.0 KiB
C
/*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public
|
|
* License v2 as published by the Free Software Foundation.
|
|
*
|
|
* This program 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 this program; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 021110-1307, USA.
|
|
*/
|
|
|
|
/*
|
|
* Original headers from kernel library for RAID5/6 calculations, not from
|
|
* btrfs kernel header.
|
|
*/
|
|
|
|
#ifndef __BTRFS_PROGS_RAID56_H__
|
|
#define __BTRFS_PROGS_RAID56_H__
|
|
|
|
void raid6_gen_syndrome(int disks, size_t bytes, void **ptrs);
|
|
int raid5_gen_result(int nr_devs, size_t stripe_len, int dest, void **data);
|
|
|
|
/*
|
|
* Headers synchronized from kernel include/linux/raid/pq.h
|
|
* No modification at all.
|
|
*
|
|
* Galois field tables.
|
|
*/
|
|
extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
|
|
extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256)));
|
|
extern const u8 raid6_gfexp[256] __attribute__((aligned(256)));
|
|
extern const u8 raid6_gfinv[256] __attribute__((aligned(256)));
|
|
extern const u8 raid6_gfexi[256] __attribute__((aligned(256)));
|
|
|
|
/* Recover raid6 with 2 data stripes corrupted */
|
|
int raid6_recov_data2(int nr_devs, size_t stripe_len, int dest1, int dest2,
|
|
void **data);
|
|
|
|
/* Recover data and P */
|
|
int raid6_recov_datap(int nr_devs, size_t stripe_len, int dest1, void **data);
|
|
|
|
/*
|
|
* Recover raid56 data
|
|
* @dest1/2 can be -1 to indicate correct data
|
|
*
|
|
* Return >0 for unrecoverable case.
|
|
* Return 0 for recoverable case, And recovered data will be stored into @data
|
|
* Return <0 for fatal error
|
|
*/
|
|
int raid56_recov(int nr_devs, size_t stripe_len, u64 profile, int dest1,
|
|
int dest2, void **data);
|
|
|
|
#endif
|