GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/cache_ram.cc
Date: 2026-09-06 02:40:30
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/logging.h"
16 #include "util/posix.h"
17 #include "util/string.h"
18
19 using namespace std; // NOLINT
20
21 const shash::Any RamCacheManager::kInvalidHandle;
22
23 ✗ string RamCacheManager::Describe() {
24 return "Internal in-memory cache manager (size "
25 ✗ + StringifyInt(max_size_ / (1024 * 1024)) + "MB)\n";
26 }
27
28
29 792 RamCacheManager::RamCacheManager(uint64_t max_size,
30 unsigned max_entries,
31 MemoryKvStore::MemoryAllocator alloc,
32 792 perf::StatisticsTemplate statistics)
33 792 : max_size_(max_size)
34
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 792 , fd_table_(max_entries, ReadOnlyHandle())
35 // TODO(jblomer): the number of slots in the kv-stores should _not_ be the
36 // number of open files.
37
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 792 , regular_entries_(max_entries,
38 alloc,
39 max_size,
40
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 1584 perf::StatisticsTemplate("kv.regular", statistics))
41
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 792 , volatile_entries_(max_entries,
42 alloc,
43 max_size,
44
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 1584 perf::StatisticsTemplate("kv.volatile", statistics))
45
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 1584 , counters_(statistics) {
46 792 const int retval = pthread_rwlock_init(&rwlock_, NULL);
47
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 792 assert(retval == 0);
48
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 792 LogCvmfs(kLogCache, kLogDebug, "max %lu B, %u entries", max_size,
49 max_entries);
50
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 792 LogCvmfs(kLogCache, kLogDebug | kLogSyslogWarn,
51 "DEPRECATION WARNING: The RAM cache manager is depcreated and "
52 "will be removed from future releases.");
53 792 }
54
55
56 2568 RamCacheManager::~RamCacheManager() { pthread_rwlock_destroy(&rwlock_); }
57
58
59 276173 int RamCacheManager::AddFd(const ReadOnlyHandle &handle) {
60 276173 const int result = fd_table_.OpenFd(handle);
61
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 276173 if (result == -ENFILE) {
62 25 LogCvmfs(kLogCache, kLogDebug, "too many open files");
63 25 perf::Inc(counters_.n_enfile);
64 }
65 276173 return result;
66 }
67
68
69 180 bool RamCacheManager::AcquireQuotaManager(QuotaManager *quota_mgr) {
70
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 180 assert(quota_mgr != NULL);
71 180 quota_mgr_ = quota_mgr;
72 180 LogCvmfs(kLogCache, kLogDebug, "set quota manager");
73 180 return true;
74 }
75
76
77 799 int RamCacheManager::Open(const LabeledObject &object) {
78 799 const WriteLockGuard guard(rwlock_);
79
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 1598 return DoOpen(object.id);
80 799 }
81
82
83 1038 int RamCacheManager::DoOpen(const shash::Any &id) {
84 bool ok;
85 bool is_volatile;
86
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 1038 const MemoryBuffer buf;
87
88
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 1038 if (regular_entries_.Contains(id)) {
89 470 is_volatile = false;
90
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 568 } else if (volatile_entries_.Contains(id)) {
91 78 is_volatile = true;
92 } else {
93
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 490 LogCvmfs(kLogCache, kLogDebug, "miss for %s", id.ToString().c_str());
94 490 perf::Inc(counters_.n_openmiss);
95 490 return -ENOENT;
96 }
97 548 const ReadOnlyHandle generic_handle(id, is_volatile);
98
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 548 const int fd = AddFd(generic_handle);
99
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 548 if (fd < 0) {
100 ✗ LogCvmfs(kLogCache, kLogDebug, "error while opening %s: %s",
101 ✗ id.ToString().c_str(), strerror(-fd));
102 ✗ return fd;
103 }
104
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 548 if (is_volatile) {
105
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 78 LogCvmfs(kLogCache, kLogDebug, "hit in volatile entries for %s",
106
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 156 id.ToString().c_str());
107 78 perf::Inc(counters_.n_openvolatile);
108 } else {
109
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 470 LogCvmfs(kLogCache, kLogDebug, "hit in regular entries for %s",
110
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 940 id.ToString().c_str());
111 470 perf::Inc(counters_.n_openregular);
112 }
113
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 548 ok = GetStore(generic_handle)->IncRef(id);
114
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 548 assert(ok);
115 548 return fd;
116 }
117
118
119 192 int64_t RamCacheManager::GetSize(int fd) {
120 192 const ReadLockGuard guard(rwlock_);
121
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 192 const ReadOnlyHandle generic_handle = fd_table_.GetHandle(fd);
122
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 192 if (generic_handle.handle == kInvalidHandle) {
123 ✗ LogCvmfs(kLogCache, kLogDebug, "bad fd %d on GetSize", fd);
124 ✗ return -EBADF;
125 }
126 192 perf::Inc(counters_.n_getsize);
127
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 192 return GetStore(generic_handle)->GetSize(generic_handle.handle);
128 192 }
129
130
131 275998 int RamCacheManager::Close(int fd) {
132 bool rc;
133
134 275998 const WriteLockGuard guard(rwlock_);
135
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 275998 const ReadOnlyHandle generic_handle = fd_table_.GetHandle(fd);
136
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 275998 if (generic_handle.handle == kInvalidHandle) {
137 ✗ LogCvmfs(kLogCache, kLogDebug, "bad fd %d on Close", fd);
138 ✗ return -EBADF;
139 }
140
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 275998 rc = GetStore(generic_handle)->Unref(generic_handle.handle);
141
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 275998 assert(rc);
142
143
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 275998 const int rc_int = fd_table_.CloseFd(fd);
144
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 275998 assert(rc_int == 0);
145
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 275998 LogCvmfs(kLogCache, kLogDebug, "closed fd %d", fd);
146 275998 perf::Inc(counters_.n_close);
147 275998 return 0;
148 275998 }
149
150
151 142 int64_t RamCacheManager::Pread(int fd,
152 void *buf,
153 uint64_t size,
154 uint64_t offset) {
155 142 const ReadLockGuard guard(rwlock_);
156
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 142 const ReadOnlyHandle generic_handle = fd_table_.GetHandle(fd);
157
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 142 if (generic_handle.handle == kInvalidHandle) {
158 ✗ LogCvmfs(kLogCache, kLogDebug, "bad fd %d on Pread", fd);
159 ✗ return -EBADF;
160 }
161 142 perf::Inc(counters_.n_pread);
162 return GetStore(generic_handle)
163
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 142 ->Read(generic_handle.handle, buf, size, offset);
164 142 }
165
166
167 275650 int RamCacheManager::Dup(int fd) {
168 bool ok;
169 int rc;
170 275650 const WriteLockGuard guard(rwlock_);
171
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 275650 const ReadOnlyHandle generic_handle = fd_table_.GetHandle(fd);
172
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 275650 if (generic_handle.handle == kInvalidHandle) {
173
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 25 LogCvmfs(kLogCache, kLogDebug, "bad fd %d on Dup", fd);
174 25 return -EBADF;
175 }
176
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 275625 rc = AddFd(generic_handle);
177
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 275625 if (rc < 0)
178 25 return rc;
179
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 275600 ok = GetStore(generic_handle)->IncRef(generic_handle.handle);
180
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 275600 assert(ok);
181
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 275600 LogCvmfs(kLogCache, kLogDebug, "dup fd %d", fd);
182 275600 perf::Inc(counters_.n_dup);
183 275600 return rc;
184 275650 }
185
186
187 /**
188 * For a RAM cache, read-ahead is a no-op.
189 */
190 ✗ int RamCacheManager::Readahead(int fd) {
191 ✗ const ReadLockGuard guard(rwlock_);
192 ✗ const ReadOnlyHandle generic_handle = fd_table_.GetHandle(fd);
193 ✗ if (generic_handle.handle == kInvalidHandle) {
194 ✗ LogCvmfs(kLogCache, kLogDebug, "bad fd %d on Readahead", fd);
195 ✗ return -EBADF;
196 }
197 ✗ LogCvmfs(kLogCache, kLogDebug, "readahead (no-op) on %d", fd);
198 ✗ perf::Inc(counters_.n_readahead);
199 ✗ return 0;
200 }
201
202
203 1023 int RamCacheManager::StartTxn(const shash::Any &id, uint64_t size, void *txn) {
204
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 1023 LogCvmfs(kLogCache, kLogDebug, "new transaction with id %s",
205 2046 id.ToString().c_str());
206 1023 Transaction *transaction = new (txn) Transaction();
207 1023 transaction->buffer.id = id;
208 1023 transaction->pos = 0;
209 1023 transaction->expected_size = size;
210
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 1023 transaction->buffer.size = (size == kSizeUnknown) ? kPageSize : size;
211 1023 transaction->buffer.address = malloc(transaction->buffer.size);
212
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 1023 if (!transaction->buffer.address && size > 0) {
213 ✗ LogCvmfs(kLogCache, kLogDebug, "failed to allocate %lu B for %s", size,
214 ✗ id.ToString().c_str());
215 ✗ return -errno;
216 }
217 1023 perf::Inc(counters_.n_starttxn);
218 1023 return 0;
219 }
220
221
222 284 void RamCacheManager::CtrlTxn(const Label &label, const int /* flags */,
223 void *txn) {
224 284 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
225 284 transaction->description = label.GetDescription();
226 284 transaction->buffer.object_flags = label.flags;
227
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 284 LogCvmfs(kLogCache, kLogDebug, "modified transaction %s",
228 568 transaction->buffer.id.ToString().c_str());
229 284 }
230
231
232 1034 int64_t RamCacheManager::Write(const void *buf, uint64_t size, void *txn) {
233 1034 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
234
235
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 1034 assert(transaction->pos <= transaction->buffer.size);
236
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 1034 if (transaction->pos + size > transaction->buffer.size) {
237
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 25 if (transaction->expected_size == kSizeUnknown) {
238 ✗ perf::Inc(counters_.n_realloc);
239 ✗ const size_t new_size = max(2 * transaction->buffer.size,
240 ✗ static_cast<size_t>(size + transaction->pos));
241 ✗ LogCvmfs(kLogCache, kLogDebug, "reallocate transaction for %s to %lu B",
242 ✗ transaction->buffer.id.ToString().c_str(),
243 transaction->buffer.size);
244 ✗ void *new_ptr = realloc(transaction->buffer.address, new_size);
245 ✗ if (!new_ptr) {
246 ✗ LogCvmfs(kLogCache, kLogDebug, "failed to allocate %lu B for %s",
247 ✗ new_size, transaction->buffer.id.ToString().c_str());
248 ✗ return -EIO;
249 }
250 ✗ transaction->buffer.address = new_ptr;
251 ✗ transaction->buffer.size = new_size;
252 } else {
253 25 LogCvmfs(kLogCache, kLogDebug,
254 "attempted to write more than requested (%lu>%zu)", size,
255 transaction->buffer.size);
256 25 return -EFBIG;
257 }
258 }
259
260
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 1009 if (transaction->buffer.address && buf) {
261 // LogCvmfs(kLogCache, kLogDebug, "copy %u bytes of transaction %s",
262 // size, transaction->id.ToString().c_str());
263 1009 memcpy(static_cast<char *>(transaction->buffer.address) + transaction->pos,
264 buf, size);
265 }
266 1009 transaction->pos += size;
267 1009 perf::Inc(counters_.n_write);
268 1009 return size;
269 }
270
271
272 64 int RamCacheManager::Reset(void *txn) {
273 64 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
274 64 transaction->pos = 0;
275
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 64 LogCvmfs(kLogCache, kLogDebug, "reset transaction %s",
276 128 transaction->buffer.id.ToString().c_str());
277 64 perf::Inc(counters_.n_reset);
278 64 return 0;
279 }
280
281
282 264 int RamCacheManager::OpenFromTxn(void *txn) {
283 264 const WriteLockGuard guard(rwlock_);
284 264 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
285
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 264 const int64_t retval = CommitToKvStore(transaction);
286
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 264 if (retval < 0) {
287
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 50 LogCvmfs(kLogCache, kLogDebug,
288 "error while committing transaction on %s: %s",
289
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 50 transaction->buffer.id.ToString().c_str(), strerror(-retval));
290 25 return retval;
291 }
292
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 239 LogCvmfs(kLogCache, kLogDebug, "open pending transaction for %s",
293
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 478 transaction->buffer.id.ToString().c_str());
294 239 perf::Inc(counters_.n_committxn);
295
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 239 return DoOpen(transaction->buffer.id);
296 264 }
297
298
299 64 int RamCacheManager::AbortTxn(void *txn) {
300 64 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
301 64 free(transaction->buffer.address);
302
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 64 LogCvmfs(kLogCache, kLogDebug, "abort transaction %s",
303 128 transaction->buffer.id.ToString().c_str());
304 64 perf::Inc(counters_.n_aborttxn);
305 64 return 0;
306 }
307
308
309 809 int RamCacheManager::CommitTxn(void *txn) {
310 809 const WriteLockGuard guard(rwlock_);
311 809 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
312 809 perf::Inc(counters_.n_committxn);
313
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 809 const int64_t rc = CommitToKvStore(transaction);
314
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 809 if (rc < 0)
315 25 return rc;
316 784 free(transaction->buffer.address);
317 784 return rc;
318 809 }
319
320
321 1073 int64_t RamCacheManager::CommitToKvStore(Transaction *transaction) {
322 MemoryKvStore *store;
323
324
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 1073 if (transaction->buffer.object_flags & CacheManager::kLabelVolatile) {
325 103 store = &volatile_entries_;
326 } else {
327 970 store = &regular_entries_;
328 }
329
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 1073 if ((transaction->buffer.object_flags & CacheManager::kLabelPinned)
330
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 1048 || (transaction->buffer.object_flags & CacheManager::kLabelCatalog)) {
331 25 transaction->buffer.refcount = 1;
332 } else {
333 1048 transaction->buffer.refcount = 0;
334 }
335
336 1073 const int64_t regular_size = regular_entries_.GetUsed();
337 1073 const int64_t volatile_size = volatile_entries_.GetUsed();
338 1073 int64_t overrun = regular_size + volatile_size + transaction->buffer.size
339 1073 - max_size_;
340
341
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 1073 if (overrun > 0) {
342 // if we're going to clean the cache, try to remove at least 25%
343 150 overrun = max(overrun, (int64_t)max_size_ >> 2);
344 150 perf::Inc(counters_.n_overrun);
345
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 150 volatile_entries_.ShrinkTo(max((int64_t)0, volatile_size - overrun));
346 }
347 1073 overrun -= volatile_size - volatile_entries_.GetUsed();
348
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 1073 if (overrun > 0) {
349
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 125 regular_entries_.ShrinkTo(max((int64_t)0, regular_size - overrun));
350 }
351 1073 overrun -= regular_size - regular_entries_.GetUsed();
352
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 1073 if (overrun > 0) {
353
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 50 LogCvmfs(kLogCache, kLogDebug,
354 "transaction for %s would overrun the cache limit by %ld",
355
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 100 transaction->buffer.id.ToString().c_str(), overrun);
356 50 perf::Inc(counters_.n_full);
357 50 return -ENOSPC;
358 }
359
360
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 1023 const int rc = store->Commit(transaction->buffer);
361
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 1023 if (rc < 0) {
362 ✗ LogCvmfs(kLogCache, kLogDebug, "commit on %s failed",
363 ✗ transaction->buffer.id.ToString().c_str());
364 ✗ return rc;
365 }
366
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 1023 LogCvmfs(kLogCache, kLogDebug, "committed %s to cache",
367
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 2046 transaction->buffer.id.ToString().c_str());
368 1023 return 0;
369 }
370