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107 lines
4.5 KiB
C
107 lines
4.5 KiB
C
/*
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* Copyright (C) 2011 Andrea Mazzoleni
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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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
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* GNU 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 License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __RAID_H
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#define __RAID_H
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/****************************************************************************/
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/* raid */
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/**
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* Max number of data disks for RAID6.
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*/
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#define RAID6_DATA_LIMIT 255
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/**
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* Max number of data disks for RAIDQP.
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*/
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#define RAIDQP_DATA_LIMIT 21
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/**
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* Initializes the RAID system.
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*/
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void raid_init(void);
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/**
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* Computes the specified number of parities.
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* \param level Number of parities to compute.
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* \param vbuf Vector of pointers to the blocks for disks and parities.
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* It has (::data + ::level) elements. Each element points to a buffer of ::size bytes.
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* \param data Number of data disks.
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* \param size Size of the blocks pointed by vbuf.
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*/
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void raid_gen(unsigned level, unsigned char** vbuf, unsigned data, unsigned size);
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/*
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* Recovers failure of one data block x using parity i.
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* Note that only the data block is recovered. The full parity is instead destroyed.
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* \param x Index of the data disk to recover. Starting from 0.
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* \param i Index of the parity to use for the recovering. Starting from 0.
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* \param vbuf Vector of pointers to the blocks for disks and parities.
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* It has (::data + ::i + 1) elements. Each element points to a buffer of ::size bytes.
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* \param data Number of data disks.
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* \param zero Buffer filled with 0 of ::size bytes.
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* This buffer is not modified.
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* \param size Size of the blocks pointed by vbuf.
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*/
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void raid_recov_1data(int x, int i, unsigned char** vbuf, unsigned data, unsigned char* zero, unsigned size);
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/*
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* Recovers failure of two data blocks x,y using parity i,j.
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* Note that only the data blocks are recovered. The full parity is instead destroyed.
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*/
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void raid_recov_2data(int x, int y, int i, int j, unsigned char** vbuf, unsigned data, unsigned char* zero, unsigned size);
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/*
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* Recovers failure of three data blocks x,y,z using parity i,j,k.
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* Note that only the data blocks are recovered. The full parity is instead destroyed.
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*/
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void raid_recov_3data(int x, int y, int z, int i, int j, int k, unsigned char** vbuf, unsigned data, unsigned char* zero, unsigned size);
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/*
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* Recovers failure of four data blocks x,y,z,v using parity i,j,k,l.
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* Note that only the data blocks are recovered. The full parity is instead destroyed.
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*/
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void raid_recov_4data(int x, int y, int z, int v, int i, int j, int k, int l, unsigned char** vbuf, unsigned data, unsigned char* zero, unsigned size);
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/**
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* Internal specialized parity computation.
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* Only for testing.
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*/
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void raid5_int32r2(unsigned char** vbuf, unsigned data, unsigned size);
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void raid5_int64r2(unsigned char** vbuf, unsigned data, unsigned size);
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void raid5_mmxr4(unsigned char** vbuf, unsigned data, unsigned size);
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void raid5_sse2r4(unsigned char** vbuf, unsigned data, unsigned size);
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void raid5_sse2r8(unsigned char** vbuf, unsigned data, unsigned size);
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void raid6_int32r2(unsigned char** vbuf, unsigned data, unsigned size);
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void raid6_int64r2(unsigned char** vbuf, unsigned data, unsigned size);
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void raid6_mmxr2(unsigned char** vbuf, unsigned data, unsigned size);
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void raid6_sse2r2(unsigned char** vbuf, unsigned data, unsigned size);
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void raid6_sse2r4(unsigned char** vbuf, unsigned data, unsigned size);
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void raidTP_int32r2(unsigned char** vbuf, unsigned data, unsigned size);
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void raidTP_int64r2(unsigned char** vbuf, unsigned data, unsigned size);
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void raidTP_mmxr1(unsigned char** vbuf, unsigned data, unsigned size);
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void raidTP_sse2r1(unsigned char** vbuf, unsigned data, unsigned size);
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void raidTP_sse2r2(unsigned char** vbuf, unsigned data, unsigned size);
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void raidQP_int32r2(unsigned char** vbuf, unsigned data, unsigned size);
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void raidQP_int64r2(unsigned char** vbuf, unsigned data, unsigned size);
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void raidQP_mmxr1(unsigned char** vbuf, unsigned data, unsigned size);
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void raidQP_sse2r1(unsigned char** vbuf, unsigned data, unsigned size);
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void raidQP_sse2r2(unsigned char** vbuf, unsigned data, unsigned size);
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#endif
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