GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/file_chunk.cc
Date: 2026-07-26 02:35:14
Exec Total Coverage
Lines: 108 136 79.4%
Branches: 63 110 57.3%
Line Branch Exec Source
1 /**
2 * This file is part of the CernVM File System.
3 */
4
5
6 #include "file_chunk.h"
7
8 #include <cassert>
9
10 #include "util/murmur.hxx"
11
12 using namespace std; // NOLINT
13
14 ✗ static inline uint32_t hasher_uint64t(const uint64_t &value) {
15 ✗ return MurmurHash2(&value, sizeof(value), 0x07387a4f);
16 }
17
18
19 //------------------------------------------------------------------------------
20
21
22 50 unsigned FileChunkReflist::FindChunkIdx(const uint64_t off) {
23
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 50 assert(list && (list->size() > 0));
24 50 unsigned idx_low = 0;
25 50 unsigned idx_high = list->size() - 1;
26 50 unsigned chunk_idx = idx_high / 2;
27
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 125 while (idx_low < idx_high) {
28
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 85 if (static_cast<uint64_t>(list->AtPtr(chunk_idx)->offset()) > off) {
29
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 15 assert(idx_high > 0);
30 15 idx_high = chunk_idx - 1;
31 } else {
32 70 if ((chunk_idx == list->size() - 1)
33
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 70 || (static_cast<uint64_t>(list->AtPtr(chunk_idx + 1)->offset())
34 > off)) {
35 10 break;
36 }
37 60 idx_low = chunk_idx + 1;
38 }
39 75 chunk_idx = idx_low + (idx_high - idx_low) / 2;
40 }
41 50 return chunk_idx;
42 }
43
44
45 /**
46 * Returns a consistent hash over hashes of the chunks. Used by libcvmfs.
47 */
48 5 shash::Any FileChunkReflist::HashChunkList() {
49 5 const shash::Algorithms algo = list->AtPtr(0)->content_hash().algorithm;
50
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 5 shash::ContextPtr ctx(algo);
51 5 ctx.buffer = alloca(ctx.size);
52
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 5 shash::Init(ctx);
53
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 15 for (unsigned i = 0; i < list->size(); ++i) {
54 10 shash::Update(
55
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 10 list->AtPtr(i)->content_hash().digest, shash::kDigestSizes[algo], ctx);
56 }
57
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 5 shash::Any result(algo);
58
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 5 shash::Final(ctx, &result);
59 10 return result;
60 }
61
62
63 //------------------------------------------------------------------------------
64
65
66 615 void ChunkTables::InitLocks() {
67 615 lock = reinterpret_cast<pthread_mutex_t *>(smalloc(sizeof(pthread_mutex_t)));
68 615 const int retval = pthread_mutex_init(lock, NULL);
69
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 615 assert(retval == 0);
70
71
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 79335 for (unsigned i = 0; i < kNumHandleLocks; ++i) {
72 pthread_mutex_t *m = reinterpret_cast<pthread_mutex_t *>(
73 78720 smalloc(sizeof(pthread_mutex_t)));
74 78720 const int retval = pthread_mutex_init(m, NULL);
75
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 78720 assert(retval == 0);
76
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 78720 handle_locks.PushBack(m);
77 }
78 615 }
79
80
81 615 void ChunkTables::InitHashmaps() {
82 615 handle2uniqino.Init(16, 0, hasher_uint64t);
83 615 handle2fd.Init(16, 0, hasher_uint64t);
84 615 inode2chunks.Init(16, 0, hasher_uint64t);
85 615 inode2references.Init(16, 0, hasher_uint64t);
86 615 }
87
88
89
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 615 ChunkTables::ChunkTables() {
90 615 next_handle = 2;
91 615 version = kVersion;
92
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 615 InitLocks();
93
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 615 InitHashmaps();
94 615 }
95
96
97 615 ChunkTables::~ChunkTables() {
98 615 pthread_mutex_destroy(lock);
99 615 free(lock);
100
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 79335 for (unsigned i = 0; i < kNumHandleLocks; ++i) {
101 78720 pthread_mutex_destroy(handle_locks.At(i));
102 78720 free(handle_locks.At(i));
103 }
104 615 }
105
106
107 ✗ ChunkTables::ChunkTables(const ChunkTables &other) {
108 ✗ version = kVersion;
109 ✗ InitLocks();
110 ✗ InitHashmaps();
111 ✗ CopyFrom(other);
112 }
113
114
115 ✗ ChunkTables &ChunkTables::operator=(const ChunkTables &other) {
116 ✗ if (&other == this)
117 ✗ return *this;
118
119 ✗ handle2uniqino.Clear();
120 ✗ handle2fd.Clear();
121 ✗ inode2chunks.Clear();
122 ✗ inode2references.Clear();
123 ✗ CopyFrom(other);
124 ✗ return *this;
125 }
126
127
128 ✗ void ChunkTables::CopyFrom(const ChunkTables &other) {
129 ✗ assert(version == other.version);
130 ✗ next_handle = other.next_handle;
131 ✗ inode2references = other.inode2references;
132 ✗ inode2chunks = other.inode2chunks;
133 ✗ handle2fd = other.handle2fd;
134 ✗ handle2uniqino = other.handle2uniqino;
135 }
136
137
138 ✗ pthread_mutex_t *ChunkTables::Handle2Lock(const uint64_t handle) const {
139 ✗ const uint32_t hash = hasher_uint64t(handle);
140 ✗ const double bucket = static_cast<double>(hash)
141 ✗ * static_cast<double>(kNumHandleLocks)
142 / static_cast<double>((uint32_t)(-1));
143 ✗ return handle_locks.At((uint32_t)bucket % kNumHandleLocks);
144 }
145
146
147 //------------------------------------------------------------------------------
148
149
150 68 SimpleChunkTables::SimpleChunkTables() {
151 68 lock_ = reinterpret_cast<pthread_mutex_t *>(smalloc(sizeof(pthread_mutex_t)));
152 68 const int retval = pthread_mutex_init(lock_, NULL);
153
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 68 assert(retval == 0);
154 68 }
155
156
157 66 SimpleChunkTables::~SimpleChunkTables() {
158
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 72 for (unsigned i = 0; i < fd_table_.size(); ++i) {
159
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 6 delete fd_table_[i].chunk_reflist.list;
160 }
161 66 pthread_mutex_destroy(lock_);
162 66 free(lock_);
163 66 }
164
165
166 48 int SimpleChunkTables::Add(FileChunkReflist chunks) {
167
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 48 assert(chunks.list != NULL);
168
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 48 OpenChunks new_entry;
169
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 48 new_entry.chunk_reflist = chunks;
170
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 48 new_entry.chunk_fd = new ChunkFd();
171 48 unsigned i = 0;
172 48 Lock();
173
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 132 for (; i < fd_table_.size(); ++i) {
174
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 90 if (fd_table_[i].chunk_reflist.list == NULL) {
175
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 6 fd_table_[i] = new_entry;
176 6 Unlock();
177 6 return i;
178 }
179 }
180
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 42 fd_table_.push_back(new_entry);
181 42 Unlock();
182 42 return i;
183 48 }
184
185
186 18 SimpleChunkTables::OpenChunks SimpleChunkTables::Get(int fd) {
187 18 OpenChunks result;
188
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 18 if (fd < 0)
189 6 return result;
190
191 12 const unsigned idx = static_cast<unsigned>(fd);
192 12 Lock();
193
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 12 if (idx < fd_table_.size())
194
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 6 result = fd_table_[idx];
195 12 Unlock();
196 12 return result;
197 }
198
199
200 54 void SimpleChunkTables::Release(int fd) {
201
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 54 if (fd < 0)
202 6 return;
203
204 48 Lock();
205 48 const unsigned idx = static_cast<unsigned>(fd);
206
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 48 if (idx >= fd_table_.size()) {
207 6 Unlock();
208 6 return;
209 }
210
211
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 42 delete fd_table_[idx].chunk_reflist.list;
212 42 fd_table_[idx].chunk_reflist.list = NULL;
213 42 fd_table_[idx].chunk_reflist.path.Assign("", 0);
214
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 42 delete fd_table_[idx].chunk_fd;
215 42 fd_table_[idx].chunk_fd = NULL;
216
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 78 while (!fd_table_.empty() && (fd_table_.back().chunk_reflist.list == NULL)) {
217 36 fd_table_.pop_back();
218 }
219 42 Unlock();
220 }
221