GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/cache_ram.cc
Date: 2025-08-31 02:39:21
Exec Total Coverage
Lines: 191 229 83.4%
Branches: 100 208 48.1%
Line Branch Exec Source
1 /**
2 * This file is part of the CernVM File System.
3 */
4
5 #include "cache_ram.h"
6
7 #include <errno.h>
8
9 #include <algorithm>
10 #include <cassert>
11 #include <cstring>
12 #include <new>
13
14 #include "kvstore.h"
15 #include "util/concurrency.h"
16 #include "util/logging.h"
17 #include "util/posix.h"
18 #include "util/string.h"
19
20 using namespace std; // NOLINT
21
22 const shash::Any RamCacheManager::kInvalidHandle;
23
24 ✗ string RamCacheManager::Describe() {
25 return "Internal in-memory cache manager (size "
26 ✗ + StringifyInt(max_size_ / (1024 * 1024)) + "MB)\n";
27 }
28
29
30 447 RamCacheManager::RamCacheManager(uint64_t max_size,
31 unsigned max_entries,
32 MemoryKvStore::MemoryAllocator alloc,
33 447 perf::StatisticsTemplate statistics)
34 447 : max_size_(max_size)
35
1/2
✓ Branch 1 taken 447 times.
✗ Branch 2 not taken.
 447 , fd_table_(max_entries, ReadOnlyHandle())
36 // TODO(jblomer): the number of slots in the kv-stores should _not_ be the
37 // number of open files.
38
1/2
✓ Branch 1 taken 447 times.
✗ Branch 2 not taken.
 447 , regular_entries_(max_entries,
39 alloc,
40 max_size,
41
2/4
✓ Branch 2 taken 447 times.
✗ Branch 3 not taken.
✓ Branch 5 taken 447 times.
✗ Branch 6 not taken.
 894 perf::StatisticsTemplate("kv.regular", statistics))
42
1/2
✓ Branch 1 taken 447 times.
✗ Branch 2 not taken.
 447 , volatile_entries_(max_entries,
43 alloc,
44 max_size,
45
2/4
✓ Branch 2 taken 447 times.
✗ Branch 3 not taken.
✓ Branch 5 taken 447 times.
✗ Branch 6 not taken.
 894 perf::StatisticsTemplate("kv.volatile", statistics))
46
2/4
✓ Branch 3 taken 447 times.
✗ Branch 4 not taken.
✓ Branch 6 taken 447 times.
✗ Branch 7 not taken.
 894 , counters_(statistics) {
47 447 const int retval = pthread_rwlock_init(&rwlock_, NULL);
48
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 447 times.
 447 assert(retval == 0);
49
1/2
✓ Branch 1 taken 447 times.
✗ Branch 2 not taken.
 447 LogCvmfs(kLogCache, kLogDebug, "max %lu B, %u entries", max_size,
50 max_entries);
51
1/2
✓ Branch 1 taken 447 times.
✗ Branch 2 not taken.
 447 LogCvmfs(kLogCache, kLogDebug | kLogSyslogWarn,
52 "DEPRECATION WARNING: The RAM cache manager is depcreated and "
53 "will be removed from future releases.");
54 447 }
55
56
57 1716 RamCacheManager::~RamCacheManager() { pthread_rwlock_destroy(&rwlock_); }
58
59
60 33444 int RamCacheManager::AddFd(const ReadOnlyHandle &handle) {
61 33444 const int result = fd_table_.OpenFd(handle);
62
2/2
✓ Branch 0 taken 3 times.
✓ Branch 1 taken 33441 times.
 33444 if (result == -ENFILE) {
63 3 LogCvmfs(kLogCache, kLogDebug, "too many open files");
64 3 perf::Inc(counters_.n_enfile);
65 }
66 33444 return result;
67 }
68
69
70 27 bool RamCacheManager::AcquireQuotaManager(QuotaManager *quota_mgr) {
71
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 27 times.
 27 assert(quota_mgr != NULL);
72 27 quota_mgr_ = quota_mgr;
73 27 LogCvmfs(kLogCache, kLogDebug, "set quota manager");
74 27 return true;
75 }
76
77
78 789 int RamCacheManager::Open(const LabeledObject &object) {
79 789 const WriteLockGuard guard(rwlock_);
80
1/2
✓ Branch 1 taken 789 times.
✗ Branch 2 not taken.
 1578 return DoOpen(object.id);
81 789 }
82
83
84 861 int RamCacheManager::DoOpen(const shash::Any &id) {
85 bool ok;
86 bool is_volatile;
87
1/2
✓ Branch 1 taken 861 times.
✗ Branch 2 not taken.
 861 const MemoryBuffer buf;
88
89
3/4
✓ Branch 1 taken 861 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 273 times.
✓ Branch 4 taken 588 times.
 861 if (regular_entries_.Contains(id)) {
90 273 is_volatile = false;
91
3/4
✓ Branch 1 taken 588 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 96 times.
✓ Branch 4 taken 492 times.
 588 } else if (volatile_entries_.Contains(id)) {
92 96 is_volatile = true;
93 } else {
94
2/4
✓ Branch 1 taken 492 times.
✗ Branch 2 not taken.
✓ Branch 5 taken 492 times.
✗ Branch 6 not taken.
 492 LogCvmfs(kLogCache, kLogDebug, "miss for %s", id.ToString().c_str());
95 492 perf::Inc(counters_.n_openmiss);
96 492 return -ENOENT;
97 }
98 369 const ReadOnlyHandle generic_handle(id, is_volatile);
99
1/2
✓ Branch 1 taken 369 times.
✗ Branch 2 not taken.
 369 const int fd = AddFd(generic_handle);
100
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 369 times.
 369 if (fd < 0) {
101 ✗ LogCvmfs(kLogCache, kLogDebug, "error while opening %s: %s",
102 ✗ id.ToString().c_str(), strerror(-fd));
103 ✗ return fd;
104 }
105
2/2
✓ Branch 0 taken 96 times.
✓ Branch 1 taken 273 times.
 369 if (is_volatile) {
106
1/2
✓ Branch 2 taken 96 times.
✗ Branch 3 not taken.
 96 LogCvmfs(kLogCache, kLogDebug, "hit in volatile entries for %s",
107
1/2
✓ Branch 1 taken 96 times.
✗ Branch 2 not taken.
 192 id.ToString().c_str());
108 96 perf::Inc(counters_.n_openvolatile);
109 } else {
110
1/2
✓ Branch 2 taken 273 times.
✗ Branch 3 not taken.
 273 LogCvmfs(kLogCache, kLogDebug, "hit in regular entries for %s",
111
1/2
✓ Branch 1 taken 273 times.
✗ Branch 2 not taken.
 546 id.ToString().c_str());
112 273 perf::Inc(counters_.n_openregular);
113 }
114
1/2
✓ Branch 2 taken 369 times.
✗ Branch 3 not taken.
 369 ok = GetStore(generic_handle)->IncRef(id);
115
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 369 times.
 369 assert(ok);
116 369 return fd;
117 }
118
119
120 153 int64_t RamCacheManager::GetSize(int fd) {
121 153 const ReadLockGuard guard(rwlock_);
122
1/2
✓ Branch 1 taken 153 times.
✗ Branch 2 not taken.
 153 const ReadOnlyHandle generic_handle = fd_table_.GetHandle(fd);
123
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 153 times.
 153 if (generic_handle.handle == kInvalidHandle) {
124 ✗ LogCvmfs(kLogCache, kLogDebug, "bad fd %d on GetSize", fd);
125 ✗ return -EBADF;
126 }
127 153 perf::Inc(counters_.n_getsize);
128
1/2
✓ Branch 2 taken 153 times.
✗ Branch 3 not taken.
 153 return GetStore(generic_handle)->GetSize(generic_handle.handle);
129 153 }
130
131
132 33423 int RamCacheManager::Close(int fd) {
133 bool rc;
134
135 33423 const WriteLockGuard guard(rwlock_);
136
1/2
✓ Branch 1 taken 33423 times.
✗ Branch 2 not taken.
 33423 const ReadOnlyHandle generic_handle = fd_table_.GetHandle(fd);
137
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 33423 times.
 33423 if (generic_handle.handle == kInvalidHandle) {
138 ✗ LogCvmfs(kLogCache, kLogDebug, "bad fd %d on Close", fd);
139 ✗ return -EBADF;
140 }
141
1/2
✓ Branch 2 taken 33423 times.
✗ Branch 3 not taken.
 33423 rc = GetStore(generic_handle)->Unref(generic_handle.handle);
142
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 33423 times.
 33423 assert(rc);
143
144
1/2
✓ Branch 1 taken 33423 times.
✗ Branch 2 not taken.
 33423 const int rc_int = fd_table_.CloseFd(fd);
145
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 33423 times.
 33423 assert(rc_int == 0);
146
1/2
✓ Branch 1 taken 33423 times.
✗ Branch 2 not taken.
 33423 LogCvmfs(kLogCache, kLogDebug, "closed fd %d", fd);
147 33423 perf::Inc(counters_.n_close);
148 33423 return 0;
149 33423 }
150
151
152 147 int64_t RamCacheManager::Pread(int fd,
153 void *buf,
154 uint64_t size,
155 uint64_t offset) {
156 147 const ReadLockGuard guard(rwlock_);
157
1/2
✓ Branch 1 taken 147 times.
✗ Branch 2 not taken.
 147 const ReadOnlyHandle generic_handle = fd_table_.GetHandle(fd);
158
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 147 times.
 147 if (generic_handle.handle == kInvalidHandle) {
159 ✗ LogCvmfs(kLogCache, kLogDebug, "bad fd %d on Pread", fd);
160 ✗ return -EBADF;
161 }
162 147 perf::Inc(counters_.n_pread);
163 return GetStore(generic_handle)
164
1/2
✓ Branch 2 taken 147 times.
✗ Branch 3 not taken.
 147 ->Read(generic_handle.handle, buf, size, offset);
165 147 }
166
167
168 33078 int RamCacheManager::Dup(int fd) {
169 bool ok;
170 int rc;
171 33078 const WriteLockGuard guard(rwlock_);
172
1/2
✓ Branch 1 taken 33078 times.
✗ Branch 2 not taken.
 33078 const ReadOnlyHandle generic_handle = fd_table_.GetHandle(fd);
173
2/2
✓ Branch 1 taken 3 times.
✓ Branch 2 taken 33075 times.
 33078 if (generic_handle.handle == kInvalidHandle) {
174
1/2
✓ Branch 1 taken 3 times.
✗ Branch 2 not taken.
 3 LogCvmfs(kLogCache, kLogDebug, "bad fd %d on Dup", fd);
175 3 return -EBADF;
176 }
177
1/2
✓ Branch 1 taken 33075 times.
✗ Branch 2 not taken.
 33075 rc = AddFd(generic_handle);
178
2/2
✓ Branch 0 taken 3 times.
✓ Branch 1 taken 33072 times.
 33075 if (rc < 0)
179 3 return rc;
180
1/2
✓ Branch 2 taken 33072 times.
✗ Branch 3 not taken.
 33072 ok = GetStore(generic_handle)->IncRef(generic_handle.handle);
181
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 33072 times.
 33072 assert(ok);
182
1/2
✓ Branch 1 taken 33072 times.
✗ Branch 2 not taken.
 33072 LogCvmfs(kLogCache, kLogDebug, "dup fd %d", fd);
183 33072 perf::Inc(counters_.n_dup);
184 33072 return rc;
185 33078 }
186
187
188 /**
189 * For a RAM cache, read-ahead is a no-op.
190 */
191 ✗ int RamCacheManager::Readahead(int fd) {
192 ✗ const ReadLockGuard guard(rwlock_);
193 ✗ const ReadOnlyHandle generic_handle = fd_table_.GetHandle(fd);
194 ✗ if (generic_handle.handle == kInvalidHandle) {
195 ✗ LogCvmfs(kLogCache, kLogDebug, "bad fd %d on Readahead", fd);
196 ✗ return -EBADF;
197 }
198 ✗ LogCvmfs(kLogCache, kLogDebug, "readahead (no-op) on %d", fd);
199 ✗ perf::Inc(counters_.n_readahead);
200 ✗ return 0;
201 }
202
203
204 426 int RamCacheManager::StartTxn(const shash::Any &id, uint64_t size, void *txn) {
205
1/2
✓ Branch 2 taken 426 times.
✗ Branch 3 not taken.
 426 LogCvmfs(kLogCache, kLogDebug, "new transaction with id %s",
206 852 id.ToString().c_str());
207 426 Transaction *transaction = new (txn) Transaction();
208 426 transaction->buffer.id = id;
209 426 transaction->pos = 0;
210 426 transaction->expected_size = size;
211
1/2
✓ Branch 0 taken 426 times.
✗ Branch 1 not taken.
 426 transaction->buffer.size = (size == kSizeUnknown) ? kPageSize : size;
212 426 transaction->buffer.address = malloc(transaction->buffer.size);
213
1/4
✗ Branch 0 not taken.
✓ Branch 1 taken 426 times.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
 426 if (!transaction->buffer.address && size > 0) {
214 ✗ LogCvmfs(kLogCache, kLogDebug, "failed to allocate %lu B for %s", size,
215 ✗ id.ToString().c_str());
216 ✗ return -errno;
217 }
218 426 perf::Inc(counters_.n_starttxn);
219 426 return 0;
220 }
221
222
223 294 void RamCacheManager::CtrlTxn(const Label &label, const int /* flags */,
224 void *txn) {
225 294 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
226 294 transaction->description = label.GetDescription();
227 294 transaction->buffer.object_flags = label.flags;
228
1/2
✓ Branch 2 taken 294 times.
✗ Branch 3 not taken.
 294 LogCvmfs(kLogCache, kLogDebug, "modified transaction %s",
229 588 transaction->buffer.id.ToString().c_str());
230 294 }
231
232
233 384 int64_t RamCacheManager::Write(const void *buf, uint64_t size, void *txn) {
234 384 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
235
236
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 384 times.
 384 assert(transaction->pos <= transaction->buffer.size);
237
2/2
✓ Branch 0 taken 3 times.
✓ Branch 1 taken 381 times.
 384 if (transaction->pos + size > transaction->buffer.size) {
238
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 3 times.
 3 if (transaction->expected_size == kSizeUnknown) {
239 ✗ perf::Inc(counters_.n_realloc);
240 ✗ const size_t new_size = max(2 * transaction->buffer.size,
241 ✗ static_cast<size_t>(size + transaction->pos));
242 ✗ LogCvmfs(kLogCache, kLogDebug, "reallocate transaction for %s to %lu B",
243 ✗ transaction->buffer.id.ToString().c_str(),
244 transaction->buffer.size);
245 ✗ void *new_ptr = realloc(transaction->buffer.address, new_size);
246 ✗ if (!new_ptr) {
247 ✗ LogCvmfs(kLogCache, kLogDebug, "failed to allocate %lu B for %s",
248 ✗ new_size, transaction->buffer.id.ToString().c_str());
249 ✗ return -EIO;
250 }
251 ✗ transaction->buffer.address = new_ptr;
252 ✗ transaction->buffer.size = new_size;
253 } else {
254 3 LogCvmfs(kLogCache, kLogDebug,
255 "attempted to write more than requested (%lu>%zu)", size,
256 transaction->buffer.size);
257 3 return -EFBIG;
258 }
259 }
260
261
2/4
✓ Branch 0 taken 381 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 381 times.
✗ Branch 3 not taken.
 381 if (transaction->buffer.address && buf) {
262 // LogCvmfs(kLogCache, kLogDebug, "copy %u bytes of transaction %s",
263 // size, transaction->id.ToString().c_str());
264 381 memcpy(static_cast<char *>(transaction->buffer.address) + transaction->pos,
265 buf, size);
266 }
267 381 transaction->pos += size;
268 381 perf::Inc(counters_.n_write);
269 381 return size;
270 }
271
272
273 51 int RamCacheManager::Reset(void *txn) {
274 51 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
275 51 transaction->pos = 0;
276
1/2
✓ Branch 2 taken 51 times.
✗ Branch 3 not taken.
 51 LogCvmfs(kLogCache, kLogDebug, "reset transaction %s",
277 102 transaction->buffer.id.ToString().c_str());
278 51 perf::Inc(counters_.n_reset);
279 51 return 0;
280 }
281
282
283 75 int RamCacheManager::OpenFromTxn(void *txn) {
284 75 const WriteLockGuard guard(rwlock_);
285 75 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
286
1/2
✓ Branch 1 taken 75 times.
✗ Branch 2 not taken.
 75 const int64_t retval = CommitToKvStore(transaction);
287
2/2
✓ Branch 0 taken 3 times.
✓ Branch 1 taken 72 times.
 75 if (retval < 0) {
288
1/2
✓ Branch 3 taken 3 times.
✗ Branch 4 not taken.
 6 LogCvmfs(kLogCache, kLogDebug,
289 "error while committing transaction on %s: %s",
290
1/2
✓ Branch 1 taken 3 times.
✗ Branch 2 not taken.
 6 transaction->buffer.id.ToString().c_str(), strerror(-retval));
291 3 return retval;
292 }
293
1/2
✓ Branch 2 taken 72 times.
✗ Branch 3 not taken.
 72 LogCvmfs(kLogCache, kLogDebug, "open pending transaction for %s",
294
1/2
✓ Branch 1 taken 72 times.
✗ Branch 2 not taken.
 144 transaction->buffer.id.ToString().c_str());
295 72 perf::Inc(counters_.n_committxn);
296
1/2
✓ Branch 1 taken 72 times.
✗ Branch 2 not taken.
 72 return DoOpen(transaction->buffer.id);
297 75 }
298
299
300 51 int RamCacheManager::AbortTxn(void *txn) {
301 51 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
302 51 free(transaction->buffer.address);
303
1/2
✓ Branch 2 taken 51 times.
✗ Branch 3 not taken.
 51 LogCvmfs(kLogCache, kLogDebug, "abort transaction %s",
304 102 transaction->buffer.id.ToString().c_str());
305 51 perf::Inc(counters_.n_aborttxn);
306 51 return 0;
307 }
308
309
310 357 int RamCacheManager::CommitTxn(void *txn) {
311 357 const WriteLockGuard guard(rwlock_);
312 357 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
313 357 perf::Inc(counters_.n_committxn);
314
1/2
✓ Branch 1 taken 357 times.
✗ Branch 2 not taken.
 357 const int64_t rc = CommitToKvStore(transaction);
315
2/2
✓ Branch 0 taken 3 times.
✓ Branch 1 taken 354 times.
 357 if (rc < 0)
316 3 return rc;
317 354 free(transaction->buffer.address);
318 354 return rc;
319 357 }
320
321
322 432 int64_t RamCacheManager::CommitToKvStore(Transaction *transaction) {
323 MemoryKvStore *store;
324
325
2/2
✓ Branch 0 taken 99 times.
✓ Branch 1 taken 333 times.
 432 if (transaction->buffer.object_flags & CacheManager::kLabelVolatile) {
326 99 store = &volatile_entries_;
327 } else {
328 333 store = &regular_entries_;
329 }
330
2/2
✓ Branch 0 taken 429 times.
✓ Branch 1 taken 3 times.
 432 if ((transaction->buffer.object_flags & CacheManager::kLabelPinned)
331
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 429 times.
 429 || (transaction->buffer.object_flags & CacheManager::kLabelCatalog)) {
332 3 transaction->buffer.refcount = 1;
333 } else {
334 429 transaction->buffer.refcount = 0;
335 }
336
337 432 const int64_t regular_size = regular_entries_.GetUsed();
338 432 const int64_t volatile_size = volatile_entries_.GetUsed();
339 432 int64_t overrun = regular_size + volatile_size + transaction->buffer.size
340 432 - max_size_;
341
342
2/2
✓ Branch 0 taken 18 times.
✓ Branch 1 taken 414 times.
 432 if (overrun > 0) {
343 // if we're going to clean the cache, try to remove at least 25%
344 18 overrun = max(overrun, (int64_t)max_size_ >> 2);
345 18 perf::Inc(counters_.n_overrun);
346
1/2
✓ Branch 2 taken 18 times.
✗ Branch 3 not taken.
 18 volatile_entries_.ShrinkTo(max((int64_t)0, volatile_size - overrun));
347 }
348 432 overrun -= volatile_size - volatile_entries_.GetUsed();
349
2/2
✓ Branch 0 taken 15 times.
✓ Branch 1 taken 417 times.
 432 if (overrun > 0) {
350
1/2
✓ Branch 2 taken 15 times.
✗ Branch 3 not taken.
 15 regular_entries_.ShrinkTo(max((int64_t)0, regular_size - overrun));
351 }
352 432 overrun -= regular_size - regular_entries_.GetUsed();
353
2/2
✓ Branch 0 taken 6 times.
✓ Branch 1 taken 426 times.
 432 if (overrun > 0) {
354
1/2
✓ Branch 2 taken 6 times.
✗ Branch 3 not taken.
 6 LogCvmfs(kLogCache, kLogDebug,
355 "transaction for %s would overrun the cache limit by %ld",
356
1/2
✓ Branch 1 taken 6 times.
✗ Branch 2 not taken.
 12 transaction->buffer.id.ToString().c_str(), overrun);
357 6 perf::Inc(counters_.n_full);
358 6 return -ENOSPC;
359 }
360
361
1/2
✓ Branch 1 taken 426 times.
✗ Branch 2 not taken.
 426 const int rc = store->Commit(transaction->buffer);
362
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 426 times.
 426 if (rc < 0) {
363 ✗ LogCvmfs(kLogCache, kLogDebug, "commit on %s failed",
364 ✗ transaction->buffer.id.ToString().c_str());
365 ✗ return rc;
366 }
367
1/2
✓ Branch 2 taken 426 times.
✗ Branch 3 not taken.
 426 LogCvmfs(kLogCache, kLogDebug, "committed %s to cache",
368
1/2
✓ Branch 1 taken 426 times.
✗ Branch 2 not taken.
 852 transaction->buffer.id.ToString().c_str());
369 426 return 0;
370 }
371