diff options
Diffstat (limited to 'kernel-lib/raid56.h')
-rw-r--r-- | kernel-lib/raid56.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/kernel-lib/raid56.h b/kernel-lib/raid56.h new file mode 100644 index 00000000..56d13f81 --- /dev/null +++ b/kernel-lib/raid56.h @@ -0,0 +1,58 @@ +/* + * 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 |