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101 lines
4 KiB
C
101 lines
4 KiB
C
/*
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* Copyright (C) 2013 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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* Maximum number of data disks.
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* Limit of the parity generator matrix used.
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*/
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#define RAID_DATA_MAX 251
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/**
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* Minimum number of data disks.
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* Limit of some optimized parity generator functions.
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*/
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#define RAID_DATA_MIN 2
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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 parity.
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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 failures of data disks using the specified parities.
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* Note that only the data blocks are recovered. The parity is destroyed.
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* \param level Number of failed disks.
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* \param d[] Vector of indexes of the data disks to recover. Starting from 0.
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* \param c[] Vector of indexes of the checksum/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 + max(::c[] + 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. 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(unsigned level, const int* d, const int* c, unsigned char** vbuf, unsigned data, unsigned char* zero, unsigned size);
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/**
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* Gets the name of the selected function to compute parity.
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* Only for testing.
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*/
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const char* raid5_tag(void);
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const char* raid6_tag(void);
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const char* raidTP_tag(void);
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const char* raidQP_tag(void);
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const char* raidPP_tag(void);
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const char* raidHP_tag(void);
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/**
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* Specialized parity computation.
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* Only for testing.
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*/
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void raid5_int32(unsigned char** vbuf, unsigned data, unsigned size);
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void raid5_int64(unsigned char** vbuf, unsigned data, unsigned size);
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void raid5_sse2(unsigned char** vbuf, unsigned data, unsigned size);
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void raid6_int32(unsigned char** vbuf, unsigned data, unsigned size);
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void raid6_int64(unsigned char** vbuf, unsigned data, unsigned size);
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void raid6_sse2(unsigned char** vbuf, unsigned data, unsigned size);
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void raid6_sse2ext(unsigned char** vbuf, unsigned data, unsigned size);
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void raidTP_int8(unsigned char** vbuf, unsigned data, unsigned size);
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void raidTP_ssse3(unsigned char** vbuf, unsigned data, unsigned size);
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void raidTP_ssse3ext(unsigned char** vbuf, unsigned data, unsigned size);
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void raidQP_int8(unsigned char** vbuf, unsigned data, unsigned size);
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void raidQP_ssse3(unsigned char** vbuf, unsigned data, unsigned size);
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void raidQP_ssse3ext(unsigned char** vbuf, unsigned data, unsigned size);
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void raidPP_int8(unsigned char** vbuf, unsigned data, unsigned size);
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void raidPP_ssse3(unsigned char** vbuf, unsigned data, unsigned size);
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void raidPP_ssse3ext(unsigned char** vbuf, unsigned data, unsigned size);
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void raidHP_int8(unsigned char** vbuf, unsigned data, unsigned size);
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void raidHP_ssse3(unsigned char** vbuf, unsigned data, unsigned size);
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void raidHP_ssse3ext(unsigned char** vbuf, unsigned data, unsigned size);
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#endif
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