197 lines
6.4 KiB
C
197 lines
6.4 KiB
C
/* *
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* Copyright (c) 2013, James S. Plank and Kevin Greenan
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* All rights reserved.
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*
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* Jerasure - A C/C++ Library for a Variety of Reed-Solomon and RAID-6 Erasure
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* Coding Techniques
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*
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* Revision 2.0: Galois Field backend now links to GF-Complete
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* - Neither the name of the University of Tennessee nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
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* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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revised by S. Simmerman
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2/25/08
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "jerasure.h"
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#include "cauchy.h"
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#define talloc(type, num) (type *) malloc(sizeof(type)*(num))
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usage(char *s)
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{
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fprintf(stderr, "usage: cauchy_03 k m w - Scheduled CRS coding example with improved matrix in GF(2^w).\n");
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fprintf(stderr, " \n");
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fprintf(stderr, " k+m must be <= 2^w. It sets up a Cauchy distribution matrix using the original\n");
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fprintf(stderr, " Cauchy Distribution matrix construction algorithm, then improves it\n");
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fprintf(stderr, " with cauchy_improve_coding_matrix(). Then it does the same encoding and\n");
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fprintf(stderr, " decoding as cauchy_02.\n");
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fprintf(stderr, " \n");
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fprintf(stderr, "This demonstrates: cauchy_original_coding_matrix()\n");
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fprintf(stderr, " cauchy_improve_coding_matrix()\n");
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fprintf(stderr, " cauchy_n_ones()\n");
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fprintf(stderr, " jerasure_smart_bitmatrix_to_schedule()\n");
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fprintf(stderr, " jerasure_schedule_encode()\n");
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fprintf(stderr, " jerasure_schedule_decode_lazy()\n");
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fprintf(stderr, " jerasure_print_matrix()\n");
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fprintf(stderr, " jerasure_get_stats()\n");
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if (s != NULL) fprintf(stderr, "%s\n", s);
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exit(1);
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}
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static void print_data_and_coding(int k, int m, int w, int psize,
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char **data, char **coding)
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{
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int i, j, x, n, sp;
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long l;
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if(k > m) n = k;
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else n = m;
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sp = psize * 2 + (psize/4) + 12;
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printf("%-*sCoding\n", sp, "Data");
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for(i = 0; i < n; i++) {
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for (j = 0; j < w; j++) {
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if(i < k) {
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if(j==0) printf("D%-2d p%-2d:", i,j);
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else printf(" p%-2d:", j);
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for(x = 0; x < psize; x +=4) {
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memcpy(&l, data[i]+j*psize+x, sizeof(long));
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printf(" %08lx", l);
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}
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printf(" ");
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}
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else printf("%*s", sp, "");
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if(i < m) {
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if(j==0) printf("C%-2d p%-2d:", i,j);
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else printf(" p%-2d:", j);
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for(x = 0; x < psize; x +=4) {
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memcpy(&l, coding[i]+j*psize+x, sizeof(long));
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printf(" %08lx", l);
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}
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}
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printf("\n");
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}
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}
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printf("\n");
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}
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int main(int argc, char **argv)
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{
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long l;
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int k, w, i, j, m;
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int *matrix, *bitmatrix, *m2, *x, *y;
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char **data, **coding, **ptrs;
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int **smart;
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int no;
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int *erasures, *erased;
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double stats[3];
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if (argc != 4) usage(NULL);
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if (sscanf(argv[1], "%d", &k) == 0 || k <= 0) usage("Bad k");
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if (sscanf(argv[2], "%d", &m) == 0 || m <= 0) usage("Bad m");
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if (sscanf(argv[3], "%d", &w) == 0 || w <= 0 || w > 32) usage("Bad w");
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if (w < 30 && (k+m) > (1 << w)) usage("k + m is too big");
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matrix = cauchy_original_coding_matrix(k, m, w);
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if (matrix == NULL) {
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usage("couldn't make coding matrix");
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}
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no = 0;
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for (i = 0; i < k*m; i++) {
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no += cauchy_n_ones(matrix[i], w);
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}
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printf("The Original Matrix has %d ones\n", no);
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cauchy_improve_coding_matrix(k, m, w, matrix);
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no = 0;
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for (i = 0; i < k*m; i++) {
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no += cauchy_n_ones(matrix[i], w);
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}
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printf("The Improved Matrix has %d ones\n\n", no);
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jerasure_print_matrix(matrix, m, k, w);
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printf("\n", no);
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bitmatrix = jerasure_matrix_to_bitmatrix(k, m, w, matrix);
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smart = jerasure_smart_bitmatrix_to_schedule(k, m, w, bitmatrix);
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srand48(0);
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data = talloc(char *, k);
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for (i = 0; i < k; i++) {
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data[i] = talloc(char, sizeof(long)*w);
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for (j = 0; j < w; j++) {
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l = lrand48();
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memcpy(data[i]+j*sizeof(long), &l, sizeof(long));
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}
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}
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coding = talloc(char *, m);
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for (i = 0; i < m; i++) {
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coding[i] = talloc(char, sizeof(long)*w);
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}
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jerasure_schedule_encode(k, m, w, smart, data, coding, w*sizeof(long), sizeof(long));
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jerasure_get_stats(stats);
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printf("Smart Encoding Complete: - %.0lf XOR'd bytes\n\n", stats[0]);
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print_data_and_coding(k, m, w, sizeof(long), data, coding);
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erasures = talloc(int, (m+1));
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erased = talloc(int, (k+m));
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for (i = 0; i < m+k; i++) erased[i] = 0;
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for (i = 0; i < m; ) {
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erasures[i] = lrand48()%(k+m);
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if (erased[erasures[i]] == 0) {
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erased[erasures[i]] = 1;
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bzero((erasures[i] < k) ? data[erasures[i]] : coding[erasures[i]-k], sizeof(long)*w);
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i++;
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}
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}
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erasures[i] = -1;
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printf("Erased %d random devices:\n\n", m);
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print_data_and_coding(k, m, w, sizeof(long), data, coding);
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jerasure_schedule_decode_lazy(k, m, w, bitmatrix, erasures, data, coding, w*sizeof(long), sizeof(long), 1);
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jerasure_get_stats(stats);
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printf("State of the system after decoding: %.0lf XOR'd bytes\n\n", stats[0]);
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print_data_and_coding(k, m, w, sizeof(long), data, coding);
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return 0;
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}
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