2 * This program is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU General Public
4 * License v2 as published by the Free Software Foundation.
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
9 * General Public License for more details.
11 * You should have received a copy of the GNU General Public
12 * License along with this program; if not, write to the
13 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
14 * Boston, MA 021110-1307, USA.
18 * Original headers from kernel library for RAID5/6 calculations, not from
19 * btrfs kernel header.
22 #ifndef __BTRFS_PROGS_RAID56_H__
23 #define __BTRFS_PROGS_RAID56_H__
25 void raid6_gen_syndrome(int disks, size_t bytes, void **ptrs);
26 int raid5_gen_result(int nr_devs, size_t stripe_len, int dest, void **data);
29 * Headers synchronized from kernel include/linux/raid/pq.h
30 * No modification at all.
32 * Galois field tables.
34 extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
35 extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256)));
36 extern const u8 raid6_gfexp[256] __attribute__((aligned(256)));
37 extern const u8 raid6_gfinv[256] __attribute__((aligned(256)));
38 extern const u8 raid6_gfexi[256] __attribute__((aligned(256)));
40 /* Recover raid6 with 2 data stripes corrupted */
41 int raid6_recov_data2(int nr_devs, size_t stripe_len, int dest1, int dest2,
44 /* Recover data and P */
45 int raid6_recov_datap(int nr_devs, size_t stripe_len, int dest1, void **data);