GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/cache_ram.cc
Date: 2025-07-06 02:35:01
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
30 610 RamCacheManager::RamCacheManager(uint64_t max_size,
31 unsigned max_entries,
32 MemoryKvStore::MemoryAllocator alloc,
33 610 perf::StatisticsTemplate statistics)
34 610 : max_size_(max_size)
35
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 610 , 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
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 610 , regular_entries_(max_entries,
39 alloc,
40 max_size,
41
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 1220 perf::StatisticsTemplate("kv.regular", statistics))
42
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 610 , volatile_entries_(max_entries,
43 alloc,
44 max_size,
45
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 1220 perf::StatisticsTemplate("kv.volatile", statistics))
46
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 1220 , counters_(statistics) {
47 610 const int retval = pthread_rwlock_init(&rwlock_, NULL);
48
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 610 assert(retval == 0);
49
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 610 LogCvmfs(kLogCache, kLogDebug, "max %lu B, %u entries", max_size,
50 max_entries);
51
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 610 LogCvmfs(kLogCache, kLogDebug | kLogSyslogWarn,
52 "DEPRECATION WARNING: The RAM cache manager is depcreated and "
53 "will be removed from future releases.");
54 610 }
55
56
57 1840 RamCacheManager::~RamCacheManager() { pthread_rwlock_destroy(&rwlock_); }
58
59
60 275935 int RamCacheManager::AddFd(const ReadOnlyHandle &handle) {
61 275935 const int result = fd_table_.OpenFd(handle);
62
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 275935 if (result == -ENFILE) {
63 25 LogCvmfs(kLogCache, kLogDebug, "too many open files");
64 25 perf::Inc(counters_.n_enfile);
65 }
66 275935 return result;
67 }
68
69
70 270 bool RamCacheManager::AcquireQuotaManager(QuotaManager *quota_mgr) {
71
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 270 assert(quota_mgr != NULL);
72 270 quota_mgr_ = quota_mgr;
73 270 LogCvmfs(kLogCache, kLogDebug, "set quota manager");
74 270 return true;
75 }
76
77
78 255 int RamCacheManager::Open(const LabeledObject &object) {
79 255 const WriteLockGuard guard(rwlock_);
80
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 510 return DoOpen(object.id);
81 255 }
82
83
84 460 int RamCacheManager::DoOpen(const shash::Any &id) {
85 bool ok;
86 bool is_volatile;
87
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 460 const MemoryBuffer buf;
88
89
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 460 if (regular_entries_.Contains(id)) {
90 300 is_volatile = false;
91
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 160 } else if (volatile_entries_.Contains(id)) {
92 10 is_volatile = true;
93 } else {
94
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 150 LogCvmfs(kLogCache, kLogDebug, "miss for %s", id.ToString().c_str());
95 150 perf::Inc(counters_.n_openmiss);
96 150 return -ENOENT;
97 }
98 310 const ReadOnlyHandle generic_handle(id, is_volatile);
99
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 310 const int fd = AddFd(generic_handle);
100
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 310 if (fd < 0) {
101 ✗ LogCvmfs(kLogCache, kLogDebug, "error while opening %s: %s",
102 ✗ id.ToString().c_str(), strerror(-fd));
103 ✗ return fd;
104 }
105
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 310 if (is_volatile) {
106
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 10 LogCvmfs(kLogCache, kLogDebug, "hit in volatile entries for %s",
107
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 20 id.ToString().c_str());
108 10 perf::Inc(counters_.n_openvolatile);
109 } else {
110
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 300 LogCvmfs(kLogCache, kLogDebug, "hit in regular entries for %s",
111
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 600 id.ToString().c_str());
112 300 perf::Inc(counters_.n_openregular);
113 }
114
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 310 ok = GetStore(generic_handle)->IncRef(id);
115
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 310 assert(ok);
116 310 return fd;
117 }
118
119
120 90 int64_t RamCacheManager::GetSize(int fd) {
121 90 const ReadLockGuard guard(rwlock_);
122
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 90 const ReadOnlyHandle generic_handle = fd_table_.GetHandle(fd);
123
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 90 if (generic_handle.handle == kInvalidHandle) {
124 ✗ LogCvmfs(kLogCache, kLogDebug, "bad fd %d on GetSize", fd);
125 ✗ return -EBADF;
126 }
127 90 perf::Inc(counters_.n_getsize);
128
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 90 return GetStore(generic_handle)->GetSize(generic_handle.handle);
129 90 }
130
131
132 275760 int RamCacheManager::Close(int fd) {
133 bool rc;
134
135 275760 const WriteLockGuard guard(rwlock_);
136
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 275760 const ReadOnlyHandle generic_handle = fd_table_.GetHandle(fd);
137
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 275760 if (generic_handle.handle == kInvalidHandle) {
138 ✗ LogCvmfs(kLogCache, kLogDebug, "bad fd %d on Close", fd);
139 ✗ return -EBADF;
140 }
141
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 275760 rc = GetStore(generic_handle)->Unref(generic_handle.handle);
142
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 275760 assert(rc);
143
144
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 275760 const int rc_int = fd_table_.CloseFd(fd);
145
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 275760 assert(rc_int == 0);
146
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 275760 LogCvmfs(kLogCache, kLogDebug, "closed fd %d", fd);
147 275760 perf::Inc(counters_.n_close);
148 275760 return 0;
149 275760 }
150
151
152 40 int64_t RamCacheManager::Pread(int fd,
153 void *buf,
154 uint64_t size,
155 uint64_t offset) {
156 40 const ReadLockGuard guard(rwlock_);
157
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 40 const ReadOnlyHandle generic_handle = fd_table_.GetHandle(fd);
158
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 40 if (generic_handle.handle == kInvalidHandle) {
159 ✗ LogCvmfs(kLogCache, kLogDebug, "bad fd %d on Pread", fd);
160 ✗ return -EBADF;
161 }
162 40 perf::Inc(counters_.n_pread);
163 return GetStore(generic_handle)
164
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 40 ->Read(generic_handle.handle, buf, size, offset);
165 40 }
166
167
168 275650 int RamCacheManager::Dup(int fd) {
169 bool ok;
170 int rc;
171 275650 const WriteLockGuard guard(rwlock_);
172
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 275650 const ReadOnlyHandle generic_handle = fd_table_.GetHandle(fd);
173
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 275650 if (generic_handle.handle == kInvalidHandle) {
174
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 25 LogCvmfs(kLogCache, kLogDebug, "bad fd %d on Dup", fd);
175 25 return -EBADF;
176 }
177
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 275625 rc = AddFd(generic_handle);
178
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 275625 if (rc < 0)
179 25 return rc;
180
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 275600 ok = GetStore(generic_handle)->IncRef(generic_handle.handle);
181
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 275600 assert(ok);
182
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 275600 LogCvmfs(kLogCache, kLogDebug, "dup fd %d", fd);
183 275600 perf::Inc(counters_.n_dup);
184 275600 return rc;
185 275650 }
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
204 785 int RamCacheManager::StartTxn(const shash::Any &id, uint64_t size, void *txn) {
205
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 785 LogCvmfs(kLogCache, kLogDebug, "new transaction with id %s",
206 1570 id.ToString().c_str());
207 785 Transaction *transaction = new (txn) Transaction();
208 785 transaction->buffer.id = id;
209 785 transaction->pos = 0;
210 785 transaction->expected_size = size;
211
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 785 transaction->buffer.size = (size == kSizeUnknown) ? kPageSize : size;
212 785 transaction->buffer.address = malloc(transaction->buffer.size);
213
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 785 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 }
218 785 perf::Inc(counters_.n_starttxn);
219 785 return 0;
220 }
221
222
223 80 void RamCacheManager::CtrlTxn(const Label &label, const int /* flags */,
224 void *txn) {
225 80 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
226 80 transaction->description = label.GetDescription();
227 80 transaction->buffer.object_flags = label.flags;
228
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 80 LogCvmfs(kLogCache, kLogDebug, "modified transaction %s",
229 160 transaction->buffer.id.ToString().c_str());
230 80 }
231
232
233 830 int64_t RamCacheManager::Write(const void *buf, uint64_t size, void *txn) {
234 830 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
235
236
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 830 assert(transaction->pos <= transaction->buffer.size);
237
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 830 if (transaction->pos + size > transaction->buffer.size) {
238
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 25 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 25 LogCvmfs(kLogCache, kLogDebug,
255 "attempted to write more than requested (%lu>%zu)", size,
256 transaction->buffer.size);
257 25 return -EFBIG;
258 }
259 }
260
261
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 805 if (transaction->buffer.address && buf) {
262 // LogCvmfs(kLogCache, kLogDebug, "copy %u bytes of transaction %s",
263 // size, transaction->id.ToString().c_str());
264 805 memcpy(static_cast<char *>(transaction->buffer.address) + transaction->pos,
265 buf, size);
266 }
267 805 transaction->pos += size;
268 805 perf::Inc(counters_.n_write);
269 805 return size;
270 }
271
272
273 30 int RamCacheManager::Reset(void *txn) {
274 30 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
275 30 transaction->pos = 0;
276
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 30 LogCvmfs(kLogCache, kLogDebug, "reset transaction %s",
277 60 transaction->buffer.id.ToString().c_str());
278 30 perf::Inc(counters_.n_reset);
279 30 return 0;
280 }
281
282
283 230 int RamCacheManager::OpenFromTxn(void *txn) {
284 230 const WriteLockGuard guard(rwlock_);
285 230 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
286
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 230 const int64_t retval = CommitToKvStore(transaction);
287
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 230 if (retval < 0) {
288
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 50 LogCvmfs(kLogCache, kLogDebug,
289 "error while committing transaction on %s: %s",
290
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 50 transaction->buffer.id.ToString().c_str(), strerror(-retval));
291 25 return retval;
292 }
293
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 205 LogCvmfs(kLogCache, kLogDebug, "open pending transaction for %s",
294
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 410 transaction->buffer.id.ToString().c_str());
295 205 perf::Inc(counters_.n_committxn);
296
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 205 return DoOpen(transaction->buffer.id);
297 230 }
298
299
300 30 int RamCacheManager::AbortTxn(void *txn) {
301 30 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
302 30 free(transaction->buffer.address);
303
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 30 LogCvmfs(kLogCache, kLogDebug, "abort transaction %s",
304 60 transaction->buffer.id.ToString().c_str());
305 30 perf::Inc(counters_.n_aborttxn);
306 30 return 0;
307 }
308
309
310 605 int RamCacheManager::CommitTxn(void *txn) {
311 605 const WriteLockGuard guard(rwlock_);
312 605 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
313 605 perf::Inc(counters_.n_committxn);
314
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 605 const int64_t rc = CommitToKvStore(transaction);
315
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 605 if (rc < 0)
316 25 return rc;
317 580 free(transaction->buffer.address);
318 580 return rc;
319 605 }
320
321
322 835 int64_t RamCacheManager::CommitToKvStore(Transaction *transaction) {
323 MemoryKvStore *store;
324
325
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 835 if (transaction->buffer.object_flags & CacheManager::kLabelVolatile) {
326 35 store = &volatile_entries_;
327 } else {
328 800 store = &regular_entries_;
329 }
330
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 835 if ((transaction->buffer.object_flags & CacheManager::kLabelPinned)
331
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 810 || (transaction->buffer.object_flags & CacheManager::kLabelCatalog)) {
332 25 transaction->buffer.refcount = 1;
333 } else {
334 810 transaction->buffer.refcount = 0;
335 }
336
337 835 const int64_t regular_size = regular_entries_.GetUsed();
338 835 const int64_t volatile_size = volatile_entries_.GetUsed();
339 835 int64_t overrun = regular_size + volatile_size + transaction->buffer.size
340 835 - max_size_;
341
342
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 835 if (overrun > 0) {
343 // if we're going to clean the cache, try to remove at least 25%
344 150 overrun = max(overrun, (int64_t)max_size_ >> 2);
345 150 perf::Inc(counters_.n_overrun);
346
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 150 volatile_entries_.ShrinkTo(max((int64_t)0, volatile_size - overrun));
347 }
348 835 overrun -= volatile_size - volatile_entries_.GetUsed();
349
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 835 if (overrun > 0) {
350
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 125 regular_entries_.ShrinkTo(max((int64_t)0, regular_size - overrun));
351 }
352 835 overrun -= regular_size - regular_entries_.GetUsed();
353
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 835 if (overrun > 0) {
354
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 50 LogCvmfs(kLogCache, kLogDebug,
355 "transaction for %s would overrun the cache limit by %ld",
356
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 100 transaction->buffer.id.ToString().c_str(), overrun);
357 50 perf::Inc(counters_.n_full);
358 50 return -ENOSPC;
359 }
360
361
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 785 const int rc = store->Commit(transaction->buffer);
362
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 785 if (rc < 0) {
363 ✗ LogCvmfs(kLogCache, kLogDebug, "commit on %s failed",
364 ✗ transaction->buffer.id.ToString().c_str());
365 ✗ return rc;
366 }
367
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 785 LogCvmfs(kLogCache, kLogDebug, "committed %s to cache",
368
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 1570 transaction->buffer.id.ToString().c_str());
369 785 return 0;
370 }
371