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-rw-r--r--src/erasure-code/clay/ErasureCodeClay.cc894
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diff --git a/src/erasure-code/clay/ErasureCodeClay.cc b/src/erasure-code/clay/ErasureCodeClay.cc
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+++ b/src/erasure-code/clay/ErasureCodeClay.cc
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2018 Indian Institute of Science <office.ece@iisc.ac.in>
+ *
+ * Author: Myna Vajha <mynaramana@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <errno.h>
+#include <algorithm>
+
+#include "ErasureCodeClay.h"
+
+#include "common/debug.h"
+#include "erasure-code/ErasureCodePlugin.h"
+#include "include/ceph_assert.h"
+#include "include/str_map.h"
+#include "include/stringify.h"
+#include "osd/osd_types.h"
+
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_osd
+#undef dout_prefix
+#define dout_prefix _prefix(_dout)
+
+#define LARGEST_VECTOR_WORDSIZE 16
+#define talloc(type, num) (type *) malloc(sizeof(type)*(num))
+
+using namespace std;
+
+static ostream& _prefix(std::ostream* _dout)
+{
+ return *_dout << "ErasureCodeClay: ";
+}
+
+static int pow_int(int a, int x) {
+ int power = 1;
+ while (x) {
+ if (x & 1) power *= a;
+ x /= 2;
+ a *= a;
+ }
+ return power;
+}
+
+ErasureCodeClay::~ErasureCodeClay()
+{
+ for (int i = 0; i < q*t; i++) {
+ if (U_buf[i].length() != 0) U_buf[i].clear();
+ }
+}
+
+int ErasureCodeClay::init(ErasureCodeProfile &profile,
+ ostream *ss)
+{
+ int r;
+ r = parse(profile, ss);
+ if (r)
+ return r;
+
+ r = ErasureCode::init(profile, ss);
+ if (r)
+ return r;
+ ErasureCodePluginRegistry &registry = ErasureCodePluginRegistry::instance();
+ r = registry.factory(mds.profile["plugin"],
+ directory,
+ mds.profile,
+ &mds.erasure_code,
+ ss);
+ if (r)
+ return r;
+ r = registry.factory(pft.profile["plugin"],
+ directory,
+ pft.profile,
+ &pft.erasure_code,
+ ss);
+ return r;
+
+}
+
+unsigned int ErasureCodeClay::get_chunk_size(unsigned int object_size) const
+{
+ unsigned int alignment_scalar_code = pft.erasure_code->get_chunk_size(1);
+ unsigned int alignment = sub_chunk_no * k * alignment_scalar_code;
+
+ return round_up_to(object_size, alignment) / k;
+}
+
+int ErasureCodeClay::minimum_to_decode(const set<int> &want_to_read,
+ const set<int> &available,
+ map<int, vector<pair<int, int>>> *minimum)
+{
+ if (is_repair(want_to_read, available)) {
+ return minimum_to_repair(want_to_read, available, minimum);
+ } else {
+ return ErasureCode::minimum_to_decode(want_to_read, available, minimum);
+ }
+}
+
+int ErasureCodeClay::decode(const set<int> &want_to_read,
+ const map<int, bufferlist> &chunks,
+ map<int, bufferlist> *decoded, int chunk_size)
+{
+ set<int> avail;
+ for ([[maybe_unused]] auto& [node, bl] : chunks) {
+ avail.insert(node);
+ (void)bl; // silence -Wunused-variable
+ }
+
+ if (is_repair(want_to_read, avail) &&
+ ((unsigned int)chunk_size > chunks.begin()->second.length())) {
+ return repair(want_to_read, chunks, decoded, chunk_size);
+ } else {
+ return ErasureCode::_decode(want_to_read, chunks, decoded);
+ }
+}
+
+void p(const set<int> &s) { cerr << s; } // for gdb
+
+int ErasureCodeClay::encode_chunks(const set<int> &want_to_encode,
+ map<int, bufferlist> *encoded)
+{
+ map<int, bufferlist> chunks;
+ set<int> parity_chunks;
+ int chunk_size = (*encoded)[0].length();
+
+ for (int i = 0; i < k + m; i++) {
+ if (i < k) {
+ chunks[i] = (*encoded)[i];
+ } else {
+ chunks[i+nu] = (*encoded)[i];
+ parity_chunks.insert(i+nu);
+ }
+ }
+
+ for (int i = k; i < k + nu; i++) {
+ bufferptr buf(buffer::create_aligned(chunk_size, SIMD_ALIGN));
+ buf.zero();
+ chunks[i].push_back(std::move(buf));
+ }
+
+ int res = decode_layered(parity_chunks, &chunks);
+ for (int i = k ; i < k + nu; i++) {
+ // need to clean some of the intermediate chunks here!!
+ chunks[i].clear();
+ }
+ return res;
+}
+
+int ErasureCodeClay::decode_chunks(const set<int> &want_to_read,
+ const map<int, bufferlist> &chunks,
+ map<int, bufferlist> *decoded)
+{
+ set<int> erasures;
+ map<int, bufferlist> coded_chunks;
+
+ for (int i = 0; i < k + m; i++) {
+ if (chunks.count(i) == 0) {
+ erasures.insert(i < k ? i : i+nu);
+ }
+ ceph_assert(decoded->count(i) > 0);
+ coded_chunks[i < k ? i : i+nu] = (*decoded)[i];
+ }
+ int chunk_size = coded_chunks[0].length();
+
+ for (int i = k; i < k+nu; i++) {
+ bufferptr buf(buffer::create_aligned(chunk_size, SIMD_ALIGN));
+ buf.zero();
+ coded_chunks[i].push_back(std::move(buf));
+ }
+
+ int res = decode_layered(erasures, &coded_chunks);
+ for (int i = k; i < k+nu; i++) {
+ coded_chunks[i].clear();
+ }
+ return res;
+}
+
+int ErasureCodeClay::parse(ErasureCodeProfile &profile,
+ ostream *ss)
+{
+ int err = 0;
+ err = ErasureCode::parse(profile, ss);
+ err |= to_int("k", profile, &k, DEFAULT_K, ss);
+ err |= to_int("m", profile, &m, DEFAULT_M, ss);
+
+ err |= sanity_check_k_m(k, m, ss);
+
+ err |= to_int("d", profile, &d, std::to_string(k+m-1), ss);
+
+ // check for scalar_mds in profile input
+ if (profile.find("scalar_mds") == profile.end() ||
+ profile.find("scalar_mds")->second.empty()) {
+ mds.profile["plugin"] = "jerasure";
+ pft.profile["plugin"] = "jerasure";
+ } else {
+ std::string p = profile.find("scalar_mds")->second;
+ if ((p == "jerasure") || (p == "isa") || (p == "shec")) {
+ mds.profile["plugin"] = p;
+ pft.profile["plugin"] = p;
+ } else {
+ *ss << "scalar_mds " << mds.profile["plugin"] <<
+ "is not currently supported, use one of 'jerasure',"<<
+ " 'isa', 'shec'" << std::endl;
+ err = -EINVAL;
+ return err;
+ }
+ }
+
+ if (profile.find("technique") == profile.end() ||
+ profile.find("technique")->second.empty()) {
+ if ((mds.profile["plugin"]=="jerasure") || (mds.profile["plugin"]=="isa") ) {
+ mds.profile["technique"] = "reed_sol_van";
+ pft.profile["technique"] = "reed_sol_van";
+ } else {
+ mds.profile["technique"] = "single";
+ pft.profile["technique"] = "single";
+ }
+ } else {
+ std::string p = profile.find("technique")->second;
+ if (mds.profile["plugin"] == "jerasure") {
+ if ( (p == "reed_sol_van") || (p == "reed_sol_r6_op") || (p == "cauchy_orig")
+ || (p == "cauchy_good") || (p == "liber8tion")) {
+ mds.profile["technique"] = p;
+ pft.profile["technique"] = p;
+ } else {
+ *ss << "technique " << p << "is not currently supported, use one of "
+ << "reed_sol_van', 'reed_sol_r6_op','cauchy_orig',"
+ << "'cauchy_good','liber8tion'"<< std::endl;
+ err = -EINVAL;
+ return err;
+ }
+ } else if (mds.profile["plugin"] == "isa") {
+ if ( (p == "reed_sol_van") || (p == "cauchy")) {
+ mds.profile["technique"] = p;
+ pft.profile["technique"] = p;
+ } else {
+ *ss << "technique " << p << "is not currently supported, use one of"
+ << "'reed_sol_van','cauchy'"<< std::endl;
+ err = -EINVAL;
+ return err;
+ }
+ } else {
+ if ( (p == "single") || (p == "multiple")) {
+ mds.profile["technique"] = p;
+ pft.profile["technique"] = p;
+ } else {
+ *ss << "technique " << p << "is not currently supported, use one of"<<
+ "'single','multiple'"<< std::endl;
+ err = -EINVAL;
+ return err;
+ }
+ }
+ }
+ if ((d < k) || (d > k + m - 1)) {
+ *ss << "value of d " << d
+ << " must be within [ " << k << "," << k+m-1 << "]" << std::endl;
+ err = -EINVAL;
+ return err;
+ }
+
+ q = d - k + 1;
+ if ((k + m) % q) {
+ nu = q - (k + m) % q;
+ } else {
+ nu = 0;
+ }
+
+ if (k+m+nu > 254) {
+ err = -EINVAL;
+ return err;
+ }
+
+ if (mds.profile["plugin"] == "shec") {
+ mds.profile["c"] = '2';
+ pft.profile["c"] = '2';
+ }
+ mds.profile["k"] = std::to_string(k+nu);
+ mds.profile["m"] = std::to_string(m);
+ mds.profile["w"] = '8';
+
+ pft.profile["k"] = '2';
+ pft.profile["m"] = '2';
+ pft.profile["w"] = '8';
+
+ t = (k + m + nu) / q;
+ sub_chunk_no = pow_int(q, t);
+
+ dout(10) << __func__
+ << " (q,t,nu)=(" << q << "," << t << "," << nu <<")" << dendl;
+
+ return err;
+}
+
+int ErasureCodeClay::is_repair(const set<int> &want_to_read,
+ const set<int> &available_chunks) {
+
+ if (includes(available_chunks.begin(), available_chunks.end(),
+ want_to_read.begin(), want_to_read.end())) return 0;
+ if (want_to_read.size() > 1) return 0;
+
+ int i = *want_to_read.begin();
+ int lost_node_id = (i < k) ? i: i+nu;
+ for (int x = 0; x < q; x++) {
+ int node = (lost_node_id/q)*q+x;
+ node = (node < k) ? node : node-nu;
+ if (node != i) { // node in the same group other than erased node
+ if (available_chunks.count(node) == 0) return 0;
+ }
+ }
+
+ if (available_chunks.size() < (unsigned)d) return 0;
+ return 1;
+}
+
+int ErasureCodeClay::minimum_to_repair(const set<int> &want_to_read,
+ const set<int> &available_chunks,
+ map<int, vector<pair<int, int>>> *minimum)
+{
+ int i = *want_to_read.begin();
+ int lost_node_index = (i < k) ? i : i+nu;
+ int rep_node_index = 0;
+
+ // add all the nodes in lost node's y column.
+ vector<pair<int, int>> sub_chunk_ind;
+ get_repair_subchunks(lost_node_index, sub_chunk_ind);
+ if ((available_chunks.size() >= (unsigned)d)) {
+ for (int j = 0; j < q; j++) {
+ if (j != lost_node_index%q) {
+ rep_node_index = (lost_node_index/q)*q+j;
+ if (rep_node_index < k) {
+ minimum->insert(make_pair(rep_node_index, sub_chunk_ind));
+ } else if (rep_node_index >= k+nu) {
+ minimum->insert(make_pair(rep_node_index-nu, sub_chunk_ind));
+ }
+ }
+ }
+ for (auto chunk : available_chunks) {
+ if (minimum->size() >= (unsigned)d) {
+ break;
+ }
+ if (!minimum->count(chunk)) {
+ minimum->emplace(chunk, sub_chunk_ind);
+ }
+ }
+ } else {
+ dout(0) << "minimum_to_repair: shouldn't have come here" << dendl;
+ ceph_assert(0);
+ }
+ ceph_assert(minimum->size() == (unsigned)d);
+ return 0;
+}
+
+void ErasureCodeClay::get_repair_subchunks(const int &lost_node,
+ vector<pair<int, int>> &repair_sub_chunks_ind)
+{
+ const int y_lost = lost_node / q;
+ const int x_lost = lost_node % q;
+
+ const int seq_sc_count = pow_int(q, t-1-y_lost);
+ const int num_seq = pow_int(q, y_lost);
+
+ int index = x_lost * seq_sc_count;
+ for (int ind_seq = 0; ind_seq < num_seq; ind_seq++) {
+ repair_sub_chunks_ind.push_back(make_pair(index, seq_sc_count));
+ index += q * seq_sc_count;
+ }
+}
+
+int ErasureCodeClay::get_repair_sub_chunk_count(const set<int> &want_to_read)
+{
+ int weight_vector[t];
+ std::fill(weight_vector, weight_vector + t, 0);
+ for (auto to_read : want_to_read) {
+ weight_vector[to_read / q]++;
+ }
+
+ int repair_subchunks_count = 1;
+ for (int y = 0; y < t; y++) {
+ repair_subchunks_count = repair_subchunks_count*(q-weight_vector[y]);
+ }
+
+ return sub_chunk_no - repair_subchunks_count;
+}
+
+int ErasureCodeClay::repair(const set<int> &want_to_read,
+ const map<int, bufferlist> &chunks,
+ map<int, bufferlist> *repaired, int chunk_size)
+{
+
+ ceph_assert((want_to_read.size() == 1) && (chunks.size() == (unsigned)d));
+
+ int repair_sub_chunk_no = get_repair_sub_chunk_count(want_to_read);
+ vector<pair<int, int>> repair_sub_chunks_ind;
+
+ unsigned repair_blocksize = chunks.begin()->second.length();
+ assert(repair_blocksize%repair_sub_chunk_no == 0);
+
+ unsigned sub_chunksize = repair_blocksize/repair_sub_chunk_no;
+ unsigned chunksize = sub_chunk_no*sub_chunksize;
+
+ ceph_assert(chunksize == (unsigned)chunk_size);
+
+ map<int, bufferlist> recovered_data;
+ map<int, bufferlist> helper_data;
+ set<int> aloof_nodes;
+
+ for (int i = 0; i < k + m; i++) {
+ // included helper data only for d+nu nodes.
+ if (auto found = chunks.find(i); found != chunks.end()) { // i is a helper
+ if (i<k) {
+ helper_data[i] = found->second;
+ } else {
+ helper_data[i+nu] = found->second;
+ }
+ } else {
+ if (i != *want_to_read.begin()) { // aloof node case.
+ int aloof_node_id = (i < k) ? i: i+nu;
+ aloof_nodes.insert(aloof_node_id);
+ } else {
+ bufferptr ptr(buffer::create_aligned(chunksize, SIMD_ALIGN));
+ ptr.zero();
+ int lost_node_id = (i < k) ? i : i+nu;
+ (*repaired)[i].push_back(ptr);
+ recovered_data[lost_node_id] = (*repaired)[i];
+ get_repair_subchunks(lost_node_id, repair_sub_chunks_ind);
+ }
+ }
+ }
+
+ // this is for shortened codes i.e., when nu > 0
+ for (int i=k; i < k+nu; i++) {
+ bufferptr ptr(buffer::create_aligned(repair_blocksize, SIMD_ALIGN));
+ ptr.zero();
+ helper_data[i].push_back(ptr);
+ }
+
+ ceph_assert(helper_data.size()+aloof_nodes.size()+recovered_data.size() ==
+ (unsigned) q*t);
+
+ int r = repair_one_lost_chunk(recovered_data, aloof_nodes,
+ helper_data, repair_blocksize,
+ repair_sub_chunks_ind);
+
+ // clear buffers created for the purpose of shortening
+ for (int i = k; i < k+nu; i++) {
+ helper_data[i].clear();
+ }
+
+ return r;
+}
+
+int ErasureCodeClay::repair_one_lost_chunk(map<int, bufferlist> &recovered_data,
+ set<int> &aloof_nodes,
+ map<int, bufferlist> &helper_data,
+ int repair_blocksize,
+ vector<pair<int,int>> &repair_sub_chunks_ind)
+{
+ unsigned repair_subchunks = (unsigned)sub_chunk_no / q;
+ unsigned sub_chunksize = repair_blocksize / repair_subchunks;
+
+ int z_vec[t];
+ map<int, set<int> > ordered_planes;
+ map<int, int> repair_plane_to_ind;
+ int count_retrieved_sub_chunks = 0;
+ int plane_ind = 0;
+
+ bufferptr buf(buffer::create_aligned(sub_chunksize, SIMD_ALIGN));
+ bufferlist temp_buf;
+ temp_buf.push_back(buf);
+
+ for (auto [index,count] : repair_sub_chunks_ind) {
+ for (int j = index; j < index + count; j++) {
+ get_plane_vector(j, z_vec);
+ int order = 0;
+ // check across all erasures and aloof nodes
+ for ([[maybe_unused]] auto& [node, bl] : recovered_data) {
+ if (node % q == z_vec[node / q]) order++;
+ (void)bl; // silence -Wunused-variable
+ }
+ for (auto node : aloof_nodes) {
+ if (node % q == z_vec[node / q]) order++;
+ }
+ ceph_assert(order > 0);
+ ordered_planes[order].insert(j);
+ // to keep track of a sub chunk within helper buffer recieved
+ repair_plane_to_ind[j] = plane_ind;
+ plane_ind++;
+ }
+ }
+ assert((unsigned)plane_ind == repair_subchunks);
+
+ int plane_count = 0;
+ for (int i = 0; i < q*t; i++) {
+ if (U_buf[i].length() == 0) {
+ bufferptr buf(buffer::create_aligned(sub_chunk_no*sub_chunksize, SIMD_ALIGN));
+ buf.zero();
+ U_buf[i].push_back(std::move(buf));
+ }
+ }
+
+ int lost_chunk;
+ int count = 0;
+ for ([[maybe_unused]] auto& [node, bl] : recovered_data) {
+ lost_chunk = node;
+ count++;
+ (void)bl; // silence -Wunused-variable
+ }
+ ceph_assert(count == 1);
+
+ set<int> erasures;
+ for (int i = 0; i < q; i++) {
+ erasures.insert(lost_chunk - lost_chunk % q + i);
+ }
+ for (auto node : aloof_nodes) {
+ erasures.insert(node);
+ }
+
+ for (int order = 1; ;order++) {
+ if (ordered_planes.count(order) == 0) {
+ break;
+ }
+ plane_count += ordered_planes[order].size();
+ for (auto z : ordered_planes[order]) {
+ get_plane_vector(z, z_vec);
+
+ for (int y = 0; y < t; y++) {
+ for (int x = 0; x < q; x++) {
+ int node_xy = y*q + x;
+ map<int, bufferlist> known_subchunks;
+ map<int, bufferlist> pftsubchunks;
+ set<int> pft_erasures;
+ if (erasures.count(node_xy) == 0) {
+ assert(helper_data.count(node_xy) > 0);
+ int z_sw = z + (x - z_vec[y])*pow_int(q,t-1-y);
+ int node_sw = y*q + z_vec[y];
+ int i0 = 0, i1 = 1, i2 = 2, i3 = 3;
+ if (z_vec[y] > x) {
+ i0 = 1;
+ i1 = 0;
+ i2 = 3;
+ i3 = 2;
+ }
+ if (aloof_nodes.count(node_sw) > 0) {
+ assert(repair_plane_to_ind.count(z) > 0);
+ assert(repair_plane_to_ind.count(z_sw) > 0);
+ pft_erasures.insert(i2);
+ known_subchunks[i0].substr_of(helper_data[node_xy], repair_plane_to_ind[z]*sub_chunksize, sub_chunksize);
+ known_subchunks[i3].substr_of(U_buf[node_sw], z_sw*sub_chunksize, sub_chunksize);
+ pftsubchunks[i0] = known_subchunks[i0];
+ pftsubchunks[i1] = temp_buf;
+ pftsubchunks[i2].substr_of(U_buf[node_xy], z*sub_chunksize, sub_chunksize);
+ pftsubchunks[i3] = known_subchunks[i3];
+ for (int i=0; i<3; i++) {
+ pftsubchunks[i].rebuild_aligned(SIMD_ALIGN);
+ }
+ pft.erasure_code->decode_chunks(pft_erasures, known_subchunks, &pftsubchunks);
+ } else {
+ ceph_assert(helper_data.count(node_sw) > 0);
+ ceph_assert(repair_plane_to_ind.count(z) > 0);
+ if (z_vec[y] != x){
+ pft_erasures.insert(i2);
+ ceph_assert(repair_plane_to_ind.count(z_sw) > 0);
+ known_subchunks[i0].substr_of(helper_data[node_xy], repair_plane_to_ind[z]*sub_chunksize, sub_chunksize);
+ known_subchunks[i1].substr_of(helper_data[node_sw], repair_plane_to_ind[z_sw]*sub_chunksize, sub_chunksize);
+ pftsubchunks[i0] = known_subchunks[i0];
+ pftsubchunks[i1] = known_subchunks[i1];
+ pftsubchunks[i2].substr_of(U_buf[node_xy], z*sub_chunksize, sub_chunksize);
+ pftsubchunks[i3].substr_of(temp_buf, 0, sub_chunksize);
+ for (int i=0; i<3; i++) {
+ pftsubchunks[i].rebuild_aligned(SIMD_ALIGN);
+ }
+ pft.erasure_code->decode_chunks(pft_erasures, known_subchunks, &pftsubchunks);
+ } else {
+ char* uncoupled_chunk = U_buf[node_xy].c_str();
+ char* coupled_chunk = helper_data[node_xy].c_str();
+ memcpy(&uncoupled_chunk[z*sub_chunksize],
+ &coupled_chunk[repair_plane_to_ind[z]*sub_chunksize],
+ sub_chunksize);
+ }
+ }
+ }
+ } // x
+ } // y
+ ceph_assert(erasures.size() <= (unsigned)m);
+ decode_uncoupled(erasures, z, sub_chunksize);
+
+ for (auto i : erasures) {
+ int x = i % q;
+ int y = i / q;
+ int node_sw = y*q+z_vec[y];
+ int z_sw = z + (x - z_vec[y]) * pow_int(q,t-1-y);
+ set<int> pft_erasures;
+ map<int, bufferlist> known_subchunks;
+ map<int, bufferlist> pftsubchunks;
+ int i0 = 0, i1 = 1, i2 = 2, i3 = 3;
+ if (z_vec[y] > x) {
+ i0 = 1;
+ i1 = 0;
+ i2 = 3;
+ i3 = 2;
+ }
+ // make sure it is not an aloof node before you retrieve repaired_data
+ if (aloof_nodes.count(i) == 0) {
+ if (x == z_vec[y]) { // hole-dot pair (type 0)
+ char* coupled_chunk = recovered_data[i].c_str();
+ char* uncoupled_chunk = U_buf[i].c_str();
+ memcpy(&coupled_chunk[z*sub_chunksize],
+ &uncoupled_chunk[z*sub_chunksize],
+ sub_chunksize);
+ count_retrieved_sub_chunks++;
+ } else {
+ ceph_assert(y == lost_chunk / q);
+ ceph_assert(node_sw == lost_chunk);
+ ceph_assert(helper_data.count(i) > 0);
+ pft_erasures.insert(i1);
+ known_subchunks[i0].substr_of(helper_data[i], repair_plane_to_ind[z]*sub_chunksize, sub_chunksize);
+ known_subchunks[i2].substr_of(U_buf[i], z*sub_chunksize, sub_chunksize);
+
+ pftsubchunks[i0] = known_subchunks[i0];
+ pftsubchunks[i1].substr_of(recovered_data[node_sw], z_sw*sub_chunksize, sub_chunksize);
+ pftsubchunks[i2] = known_subchunks[i2];
+ pftsubchunks[i3] = temp_buf;
+ for (int i=0; i<3; i++) {
+ pftsubchunks[i].rebuild_aligned(SIMD_ALIGN);
+ }
+ pft.erasure_code->decode_chunks(pft_erasures, known_subchunks, &pftsubchunks);
+ }
+ }
+ } // recover all erasures
+ } // planes of particular order
+ } // order
+
+ return 0;
+}
+
+
+int ErasureCodeClay::decode_layered(set<int> &erased_chunks,
+ map<int, bufferlist> *chunks)
+{
+ int num_erasures = erased_chunks.size();
+
+ int size = (*chunks)[0].length();
+ ceph_assert(size%sub_chunk_no == 0);
+ int sc_size = size / sub_chunk_no;
+
+ ceph_assert(num_erasures > 0);
+
+ for (int i = k+nu; (num_erasures < m) && (i < q*t); i++) {
+ if ([[maybe_unused]] auto [it, added] = erased_chunks.emplace(i); added) {
+ num_erasures++;
+ (void)it; // silence -Wunused-variable
+ }
+ }
+ ceph_assert(num_erasures == m);
+
+ int max_iscore = get_max_iscore(erased_chunks);
+ int order[sub_chunk_no];
+ int z_vec[t];
+ for (int i = 0; i < q*t; i++) {
+ if (U_buf[i].length() == 0) {
+ bufferptr buf(buffer::create_aligned(size, SIMD_ALIGN));
+ buf.zero();
+ U_buf[i].push_back(std::move(buf));
+ }
+ }
+
+ set_planes_sequential_decoding_order(order, erased_chunks);
+
+ for (int iscore = 0; iscore <= max_iscore; iscore++) {
+ for (int z = 0; z < sub_chunk_no; z++) {
+ if (order[z] == iscore) {
+ decode_erasures(erased_chunks, z, chunks, sc_size);
+ }
+ }
+
+ for (int z = 0; z < sub_chunk_no; z++) {
+ if (order[z] == iscore) {
+ get_plane_vector(z, z_vec);
+ for (auto node_xy : erased_chunks) {
+ int x = node_xy % q;
+ int y = node_xy / q;
+ int node_sw = y*q+z_vec[y];
+ if (z_vec[y] != x) {
+ if (erased_chunks.count(node_sw) == 0) {
+ recover_type1_erasure(chunks, x, y, z, z_vec, sc_size);
+ } else if (z_vec[y] < x){
+ ceph_assert(erased_chunks.count(node_sw) > 0);
+ ceph_assert(z_vec[y] != x);
+ get_coupled_from_uncoupled(chunks, x, y, z, z_vec, sc_size);
+ }
+ } else {
+ char* C = (*chunks)[node_xy].c_str();
+ char* U = U_buf[node_xy].c_str();
+ memcpy(&C[z*sc_size], &U[z*sc_size], sc_size);
+ }
+ }
+ }
+ } // plane
+ } // iscore, order
+
+ return 0;
+}
+
+int ErasureCodeClay::decode_erasures(const set<int>& erased_chunks, int z,
+ map<int, bufferlist>* chunks, int sc_size)
+{
+ int z_vec[t];
+
+ get_plane_vector(z, z_vec);
+
+ for (int x = 0; x < q; x++) {
+ for (int y = 0; y < t; y++) {
+ int node_xy = q*y+x;
+ int node_sw = q*y+z_vec[y];
+ if (erased_chunks.count(node_xy) == 0) {
+ if (z_vec[y] < x) {
+ get_uncoupled_from_coupled(chunks, x, y, z, z_vec, sc_size);
+ } else if (z_vec[y] == x) {
+ char* uncoupled_chunk = U_buf[node_xy].c_str();
+ char* coupled_chunk = (*chunks)[node_xy].c_str();
+ memcpy(&uncoupled_chunk[z*sc_size], &coupled_chunk[z*sc_size], sc_size);
+ } else {
+ if (erased_chunks.count(node_sw) > 0) {
+ get_uncoupled_from_coupled(chunks, x, y, z, z_vec, sc_size);
+ }
+ }
+ }
+ }
+ }
+ return decode_uncoupled(erased_chunks, z, sc_size);
+}
+
+int ErasureCodeClay::decode_uncoupled(const set<int>& erased_chunks, int z, int sc_size)
+{
+ map<int, bufferlist> known_subchunks;
+ map<int, bufferlist> all_subchunks;
+
+ for (int i = 0; i < q*t; i++) {
+ if (erased_chunks.count(i) == 0) {
+ known_subchunks[i].substr_of(U_buf[i], z*sc_size, sc_size);
+ all_subchunks[i] = known_subchunks[i];
+ } else {
+ all_subchunks[i].substr_of(U_buf[i], z*sc_size, sc_size);
+ }
+ all_subchunks[i].rebuild_aligned_size_and_memory(sc_size, SIMD_ALIGN);
+ assert(all_subchunks[i].is_contiguous());
+ }
+
+ mds.erasure_code->decode_chunks(erased_chunks, known_subchunks, &all_subchunks);
+ return 0;
+}
+
+void ErasureCodeClay::set_planes_sequential_decoding_order(int* order, set<int>& erasures) {
+ int z_vec[t];
+ for (int z = 0; z < sub_chunk_no; z++) {
+ get_plane_vector(z,z_vec);
+ order[z] = 0;
+ for (auto i : erasures) {
+ if (i % q == z_vec[i / q]) {
+ order[z] = order[z] + 1;
+ }
+ }
+ }
+}
+
+void ErasureCodeClay::recover_type1_erasure(map<int, bufferlist>* chunks,
+ int x, int y, int z,
+ int* z_vec, int sc_size)
+{
+ set<int> erased_chunks;
+
+ int node_xy = y*q+x;
+ int node_sw = y*q+z_vec[y];
+ int z_sw = z + (x - z_vec[y]) * pow_int(q,t-1-y);
+
+ map<int, bufferlist> known_subchunks;
+ map<int, bufferlist> pftsubchunks;
+ bufferptr ptr(buffer::create_aligned(sc_size, SIMD_ALIGN));
+ ptr.zero();
+
+ int i0 = 0, i1 = 1, i2 = 2, i3 = 3;
+ if (z_vec[y] > x) {
+ i0 = 1;
+ i1 = 0;
+ i2 = 3;
+ i3 = 2;
+ }
+
+ erased_chunks.insert(i0);
+ pftsubchunks[i0].substr_of((*chunks)[node_xy], z * sc_size, sc_size);
+ known_subchunks[i1].substr_of((*chunks)[node_sw], z_sw * sc_size, sc_size);
+ known_subchunks[i2].substr_of(U_buf[node_xy], z * sc_size, sc_size);
+ pftsubchunks[i1] = known_subchunks[i1];
+ pftsubchunks[i2] = known_subchunks[i2];
+ pftsubchunks[i3].push_back(ptr);
+
+ for (int i=0; i<3; i++) {
+ pftsubchunks[i].rebuild_aligned_size_and_memory(sc_size, SIMD_ALIGN);
+ }
+
+ pft.erasure_code->decode_chunks(erased_chunks, known_subchunks, &pftsubchunks);
+}
+
+void ErasureCodeClay::get_coupled_from_uncoupled(map<int, bufferlist>* chunks,
+ int x, int y, int z,
+ int* z_vec, int sc_size)
+{
+ set<int> erased_chunks = {0, 1};
+
+ int node_xy = y*q+x;
+ int node_sw = y*q+z_vec[y];
+ int z_sw = z + (x - z_vec[y]) * pow_int(q,t-1-y);
+
+ ceph_assert(z_vec[y] < x);
+ map<int, bufferlist> uncoupled_subchunks;
+ uncoupled_subchunks[2].substr_of(U_buf[node_xy], z * sc_size, sc_size);
+ uncoupled_subchunks[3].substr_of(U_buf[node_sw], z_sw * sc_size, sc_size);
+
+ map<int, bufferlist> pftsubchunks;
+ pftsubchunks[0].substr_of((*chunks)[node_xy], z * sc_size, sc_size);
+ pftsubchunks[1].substr_of((*chunks)[node_sw], z_sw * sc_size, sc_size);
+ pftsubchunks[2] = uncoupled_subchunks[2];
+ pftsubchunks[3] = uncoupled_subchunks[3];
+
+ for (int i=0; i<3; i++) {
+ pftsubchunks[i].rebuild_aligned_size_and_memory(sc_size, SIMD_ALIGN);
+ }
+ pft.erasure_code->decode_chunks(erased_chunks, uncoupled_subchunks, &pftsubchunks);
+}
+
+void ErasureCodeClay::get_uncoupled_from_coupled(map<int, bufferlist>* chunks,
+ int x, int y, int z,
+ int* z_vec, int sc_size)
+{
+ set<int> erased_chunks = {2, 3};
+
+ int node_xy = y*q+x;
+ int node_sw = y*q+z_vec[y];
+ int z_sw = z + (x - z_vec[y]) * pow_int(q,t-1-y);
+
+ int i0 = 0, i1 = 1, i2 = 2, i3 = 3;
+ if (z_vec[y] > x) {
+ i0 = 1;
+ i1 = 0;
+ i2 = 3;
+ i3 = 2;
+ }
+ map<int, bufferlist> coupled_subchunks;
+ coupled_subchunks[i0].substr_of((*chunks)[node_xy], z * sc_size, sc_size);
+ coupled_subchunks[i1].substr_of((*chunks)[node_sw], z_sw * sc_size, sc_size);
+
+ map<int, bufferlist> pftsubchunks;
+ pftsubchunks[0] = coupled_subchunks[0];
+ pftsubchunks[1] = coupled_subchunks[1];
+ pftsubchunks[i2].substr_of(U_buf[node_xy], z * sc_size, sc_size);
+ pftsubchunks[i3].substr_of(U_buf[node_sw], z_sw * sc_size, sc_size);
+ for (int i=0; i<3; i++) {
+ pftsubchunks[i].rebuild_aligned_size_and_memory(sc_size, SIMD_ALIGN);
+ }
+ pft.erasure_code->decode_chunks(erased_chunks, coupled_subchunks, &pftsubchunks);
+}
+
+int ErasureCodeClay::get_max_iscore(set<int>& erased_chunks)
+{
+ int weight_vec[t];
+ int iscore = 0;
+ memset(weight_vec, 0, sizeof(int)*t);
+
+ for (auto i : erased_chunks) {
+ if (weight_vec[i / q] == 0) {
+ weight_vec[i / q] = 1;
+ iscore++;
+ }
+ }
+ return iscore;
+}
+
+void ErasureCodeClay::get_plane_vector(int z, int* z_vec)
+{
+ for (int i = 0; i < t; i++) {
+ z_vec[t-1-i] = z % q;
+ z = (z - z_vec[t-1-i]) / q;
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-30 17:35:22 +0000