GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/file_chunk.cc
Date: 2026-06-14 02:36:34
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
22 420 unsigned FileChunkReflist::FindChunkIdx(const uint64_t off) {
23
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 420 assert(list && (list->size() > 0));
24 420 unsigned idx_low = 0;
25 420 unsigned idx_high = list->size() - 1;
26 420 unsigned chunk_idx = idx_high / 2;
27
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 1050 while (idx_low < idx_high) {
28
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 714 if (static_cast<uint64_t>(list->AtPtr(chunk_idx)->offset()) > off) {
29
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 126 assert(idx_high > 0);
30 126 idx_high = chunk_idx - 1;
31 } else {
32 588 if ((chunk_idx == list->size() - 1)
33
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 588 || (static_cast<uint64_t>(list->AtPtr(chunk_idx + 1)->offset())
34 > off)) {
35 84 break;
36 }
37 504 idx_low = chunk_idx + 1;
38 }
39 630 chunk_idx = idx_low + (idx_high - idx_low) / 2;
40 }
41 420 return chunk_idx;
42 }
43
44
45 /**
46 * Returns a consistent hash over hashes of the chunks. Used by libcvmfs.
47 */
48 42 shash::Any FileChunkReflist::HashChunkList() {
49 42 const shash::Algorithms algo = list->AtPtr(0)->content_hash().algorithm;
50
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 42 shash::ContextPtr ctx(algo);
51 42 ctx.buffer = alloca(ctx.size);
52
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 42 shash::Init(ctx);
53
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 126 for (unsigned i = 0; i < list->size(); ++i) {
54 84 shash::Update(
55
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 84 list->AtPtr(i)->content_hash().digest, shash::kDigestSizes[algo], ctx);
56 }
57
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 42 shash::Any result(algo);
58
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 42 shash::Final(ctx, &result);
59 84 return result;
60 }
61
62
63 //------------------------------------------------------------------------------
64
65
66 62 void ChunkTables::InitLocks() {
67 62 lock = reinterpret_cast<pthread_mutex_t *>(smalloc(sizeof(pthread_mutex_t)));
68 62 const int retval = pthread_mutex_init(lock, NULL);
69
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 62 assert(retval == 0);
70
71
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 7998 for (unsigned i = 0; i < kNumHandleLocks; ++i) {
72 pthread_mutex_t *m = reinterpret_cast<pthread_mutex_t *>(
73 7936 smalloc(sizeof(pthread_mutex_t)));
74 7936 const int retval = pthread_mutex_init(m, NULL);
75
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 7936 assert(retval == 0);
76
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 7936 handle_locks.PushBack(m);
77 }
78 62 }
79
80
81 62 void ChunkTables::InitHashmaps() {
82 62 handle2uniqino.Init(16, 0, hasher_uint64t);
83 62 handle2fd.Init(16, 0, hasher_uint64t);
84 62 inode2chunks.Init(16, 0, hasher_uint64t);
85 62 inode2references.Init(16, 0, hasher_uint64t);
86 62 }
87
88
89
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 62 ChunkTables::ChunkTables() {
90 62 next_handle = 2;
91 62 version = kVersion;
92
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 62 InitLocks();
93
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 62 InitHashmaps();
94 62 }
95
96
97 62 ChunkTables::~ChunkTables() {
98 62 pthread_mutex_destroy(lock);
99 62 free(lock);
100
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 7998 for (unsigned i = 0; i < kNumHandleLocks; ++i) {
101 7936 pthread_mutex_destroy(handle_locks.At(i));
102 7936 free(handle_locks.At(i));
103 }
104 62 }
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
150 378 SimpleChunkTables::SimpleChunkTables() {
151 378 lock_ = reinterpret_cast<pthread_mutex_t *>(smalloc(sizeof(pthread_mutex_t)));
152 378 const int retval = pthread_mutex_init(lock_, NULL);
153
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 378 assert(retval == 0);
154 378 }
155
156
157 376 SimpleChunkTables::~SimpleChunkTables() {
158
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 419 for (unsigned i = 0; i < fd_table_.size(); ++i) {
159
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 43 delete fd_table_[i].chunk_reflist.list;
160 }
161 376 pthread_mutex_destroy(lock_);
162 376 free(lock_);
163 376 }
164
165
166 344 int SimpleChunkTables::Add(FileChunkReflist chunks) {
167
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 344 assert(chunks.list != NULL);
168
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 344 OpenChunks new_entry;
169
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 344 new_entry.chunk_reflist = chunks;
170
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 344 new_entry.chunk_fd = new ChunkFd();
171 344 unsigned i = 0;
172 344 Lock();
173
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 946 for (; i < fd_table_.size(); ++i) {
174
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 645 if (fd_table_[i].chunk_reflist.list == NULL) {
175
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 43 fd_table_[i] = new_entry;
176 43 Unlock();
177 43 return i;
178 }
179 }
180
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 301 fd_table_.push_back(new_entry);
181 301 Unlock();
182 301 return i;
183 344 }
184
185
186 129 SimpleChunkTables::OpenChunks SimpleChunkTables::Get(int fd) {
187 129 OpenChunks result;
188
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 129 if (fd < 0)
189 43 return result;
190
191 86 const unsigned idx = static_cast<unsigned>(fd);
192 86 Lock();
193
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 86 if (idx < fd_table_.size())
194
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 43 result = fd_table_[idx];
195 86 Unlock();
196 86 return result;
197 }
198
199
200 387 void SimpleChunkTables::Release(int fd) {
201
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 387 if (fd < 0)
202 43 return;
203
204 344 Lock();
205 344 const unsigned idx = static_cast<unsigned>(fd);
206
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 344 if (idx >= fd_table_.size()) {
207 43 Unlock();
208 43 return;
209 }
210
211
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 301 delete fd_table_[idx].chunk_reflist.list;
212 301 fd_table_[idx].chunk_reflist.list = NULL;
213 301 fd_table_[idx].chunk_reflist.path.Assign("", 0);
214
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 301 delete fd_table_[idx].chunk_fd;
215 301 fd_table_[idx].chunk_fd = NULL;
216
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 559 while (!fd_table_.empty() && (fd_table_.back().chunk_reflist.list == NULL)) {
217 258 fd_table_.pop_back();
218 }
219 301 Unlock();
220 }
221