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