GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/glue_buffer.cc
Date: 2025-08-31 02:39:21
Exec Total Coverage
Lines: 201 273 73.6%
Branches: 75 180 41.7%
Line Branch Exec Source
1 /**
2 * This file is part of the CernVM File System.
3 */
4
5 #define __STDC_FORMAT_MACROS
6
7
8 #include "glue_buffer.h"
9
10 #include <errno.h>
11 #include <poll.h>
12 #include <unistd.h>
13
14 #include <cassert>
15 #include <cstdlib>
16 #include <cstring>
17 #include <string>
18 #include <vector>
19
20 #include "util/exception.h"
21 #include "util/logging.h"
22 #include "util/mutex.h"
23 #include "util/platform.h"
24 #include "util/posix.h"
25 #include "util/smalloc.h"
26
27 using namespace std; // NOLINT
28
29 namespace glue {
30
31 ✗ PathStore &PathStore::operator=(const PathStore &other) {
32 ✗ if (&other == this)
33 ✗ return *this;
34
35 ✗ delete string_heap_;
36 ✗ CopyFrom(other);
37 ✗ return *this;
38 }
39
40
41 ✗ PathStore::PathStore(const PathStore &other) { CopyFrom(other); }
42
43
44 ✗ void PathStore::CopyFrom(const PathStore &other) {
45 ✗ map_ = other.map_;
46
47 ✗ string_heap_ = new StringHeap(other.string_heap_->used());
48 ✗ const shash::Md5 empty_path = map_.empty_key();
49 ✗ for (unsigned i = 0; i < map_.capacity(); ++i) {
50 ✗ if (map_.keys()[i] != empty_path) {
51 ✗ (map_.values() + i)->name = string_heap_->AddString(
52 ✗ map_.values()[i].name.length(), map_.values()[i].name.data());
53 }
54 }
55 }
56
57
58 //------------------------------------------------------------------------------
59
60
61 437 void InodeTracker::InitLock() {
62 437 lock_ = reinterpret_cast<pthread_mutex_t *>(smalloc(sizeof(pthread_mutex_t)));
63 437 const int retval = pthread_mutex_init(lock_, NULL);
64
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 437 assert(retval == 0);
65 437 }
66
67
68 ✗ void InodeTracker::CopyFrom(const InodeTracker &other) {
69 ✗ assert(other.version_ == kVersion);
70 ✗ version_ = kVersion;
71 ✗ path_map_ = other.path_map_;
72 ✗ inode_ex_map_ = other.inode_ex_map_;
73 ✗ inode_references_ = other.inode_references_;
74 ✗ statistics_ = other.statistics_;
75 }
76
77
78
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 437 InodeTracker::InodeTracker() {
79 437 version_ = kVersion;
80 437 InitLock();
81 437 }
82
83
84 ✗ InodeTracker::InodeTracker(const InodeTracker &other) {
85 ✗ CopyFrom(other);
86 ✗ InitLock();
87 }
88
89
90 ✗ InodeTracker &InodeTracker::operator=(const InodeTracker &other) {
91 ✗ if (&other == this)
92 ✗ return *this;
93
94 ✗ CopyFrom(other);
95 ✗ return *this;
96 }
97
98
99 435 InodeTracker::~InodeTracker() {
100 435 pthread_mutex_destroy(lock_);
101 435 free(lock_);
102 435 }
103
104
105 //------------------------------------------------------------------------------
106
107 331 DentryTracker::DentryTracker() : version_(kVersion), is_active_(true) {
108 331 pipe_terminate_[0] = pipe_terminate_[1] = -1;
109 331 cleaning_interval_ms_ = -1;
110 331 InitLock();
111 331 }
112
113
114 475 DentryTracker::~DentryTracker() {
115
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 475 if (pipe_terminate_[1] >= 0) {
116 14 char t = 'T';
117 14 WritePipe(pipe_terminate_[1], &t, 1);
118 14 pthread_join(thread_cleaner_, NULL);
119 14 ClosePipe(pipe_terminate_);
120 }
121 475 pthread_mutex_destroy(lock_);
122 475 free(lock_);
123 475 }
124
125
126 156 DentryTracker::DentryTracker(const DentryTracker &other) {
127
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 156 CopyFrom(other);
128 156 pipe_terminate_[0] = pipe_terminate_[1] = -1;
129 156 cleaning_interval_ms_ = -1;
130 156 InitLock();
131 156 }
132
133
134 ✗ DentryTracker &DentryTracker::operator=(const DentryTracker &other) {
135 ✗ if (&other == this)
136 ✗ return *this;
137
138 ✗ Lock();
139 ✗ CopyFrom(other);
140 ✗ Unlock();
141 ✗ return *this;
142 }
143
144
145 156 void DentryTracker::CopyFrom(const DentryTracker &other) {
146
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 156 assert(other.version_ == kVersion);
147
148 156 version_ = kVersion;
149 156 statistics_ = other.statistics_;
150 156 is_active_ = other.is_active_;
151 156 entries_ = other.entries_;
152 156 }
153
154
155 156 DentryTracker *DentryTracker::Move() {
156 156 Lock();
157
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 156 DentryTracker *new_tracker = new DentryTracker(*this);
158 156 statistics_.num_remove += entries_.size();
159 156 entries_.Clear();
160 156 Unlock();
161 156 return new_tracker;
162 }
163
164
165 14 void DentryTracker::SpawnCleaner(unsigned interval_s) {
166
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 14 assert(pipe_terminate_[0] == -1);
167 14 cleaning_interval_ms_ = interval_s * 1000;
168
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 14 if (cleaning_interval_ms_ == 0)
169 ✗ cleaning_interval_ms_ = -1;
170 14 MakePipe(pipe_terminate_);
171 14 const int retval = pthread_create(&thread_cleaner_, NULL, MainCleaner, this);
172
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 14 assert(retval == 0);
173 14 }
174
175
176 14 void *DentryTracker::MainCleaner(void *data) {
177 14 DentryTracker *tracker = reinterpret_cast<DentryTracker *>(data);
178
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 14 LogCvmfs(kLogCvmfs, kLogDebug, "starting negative entry cache cleaner");
179
180 struct pollfd watch_term;
181 14 watch_term.fd = tracker->pipe_terminate_[0];
182 14 watch_term.events = POLLIN | POLLPRI;
183 14 int timeout_ms = tracker->cleaning_interval_ms_;
184 ;
185 14 uint64_t deadline = platform_monotonic_time() + timeout_ms / 1000;
186 while (true) {
187 56 watch_term.revents = 0;
188
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 56 const int retval = poll(&watch_term, 1, timeout_ms);
189
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 56 if (retval < 0) {
190 ✗ if (errno == EINTR) {
191 ✗ if (timeout_ms >= 0) {
192 ✗ const uint64_t now = platform_monotonic_time();
193 ✗ timeout_ms = (now > deadline) ? 0 : (deadline - now) * 1000;
194 }
195 42 continue;
196 }
197 ✗ abort();
198 }
199 56 timeout_ms = tracker->cleaning_interval_ms_;
200 56 deadline = platform_monotonic_time() + timeout_ms / 1000;
201
202
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 56 if (retval == 0) {
203
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 42 LogCvmfs(kLogCvmfs, kLogDebug, "negative entry cleaner: pruning");
204
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 42 tracker->Prune();
205 42 continue;
206 }
207
208
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 14 assert(watch_term.revents != 0);
209
210 14 char c = 0;
211
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 14 ReadPipe(tracker->pipe_terminate_[0], &c, 1);
212
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 14 assert(c == 'T');
213 14 break;
214 42 }
215
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 14 LogCvmfs(kLogCvmfs, kLogDebug, "stopping negative entry cache cleaner");
216 14 return NULL;
217 }
218
219
220 487 void DentryTracker::InitLock() {
221 487 lock_ = reinterpret_cast<pthread_mutex_t *>(smalloc(sizeof(pthread_mutex_t)));
222 487 const int retval = pthread_mutex_init(lock_, NULL);
223
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 487 assert(retval == 0);
224 487 }
225
226
227 200 void DentryTracker::Prune() {
228 200 Lock();
229 200 DoPrune(platform_monotonic_time());
230 200 Unlock();
231 200 }
232
233
234 238 DentryTracker::Cursor DentryTracker::BeginEnumerate() {
235 238 Entry *head = NULL;
236 238 Lock();
237
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 238 entries_.Peek(&head);
238 238 return Cursor(head);
239 }
240
241
242 61670 bool DentryTracker::NextEntry(Cursor *cursor, uint64_t *inode_parent,
243 NameString *name) {
244
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 61670 if (cursor->head == NULL)
245 116 return false;
246
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 61554 if (cursor->pos >= entries_.size())
247 74 return false;
248 61480 Entry *e = cursor->head + cursor->pos;
249 61480 *inode_parent = e->inode_parent;
250 61480 *name = e->name;
251 61480 cursor->pos++;
252 61480 return true;
253 }
254
255
256 238 void DentryTracker::EndEnumerate(Cursor * /* cursor */) { Unlock(); }
257
258
259 //------------------------------------------------------------------------------
260
261
262
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 187 PageCacheTracker::PageCacheTracker() : version_(kVersion), is_active_(true) {
263
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 187 map_.Init(16, 0, hasher_inode);
264 187 InitLock();
265 187 }
266
267
268 185 PageCacheTracker::~PageCacheTracker() {
269 185 pthread_mutex_destroy(lock_);
270 185 free(lock_);
271 185 }
272
273
274 ✗ PageCacheTracker::PageCacheTracker(const PageCacheTracker &other) {
275 ✗ CopyFrom(other);
276 ✗ InitLock();
277 }
278
279
280 ✗ PageCacheTracker &PageCacheTracker::operator=(const PageCacheTracker &other) {
281 ✗ if (&other == this)
282 ✗ return *this;
283
284 ✗ const MutexLockGuard guard(lock_);
285 ✗ CopyFrom(other);
286 ✗ return *this;
287 }
288
289
290 ✗ void PageCacheTracker::CopyFrom(const PageCacheTracker &other) {
291 ✗ assert(other.version_ == kVersion);
292
293 ✗ version_ = kVersion;
294 ✗ is_active_ = other.is_active_;
295 ✗ statistics_ = other.statistics_;
296
297 ✗ map_.Init(16, 0, hasher_inode);
298 ✗ map_ = other.map_;
299 ✗ stat_store_ = other.stat_store_;
300 }
301
302
303 187 void PageCacheTracker::InitLock() {
304 187 lock_ = reinterpret_cast<pthread_mutex_t *>(smalloc(sizeof(pthread_mutex_t)));
305 187 const int retval = pthread_mutex_init(lock_, NULL);
306
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 187 assert(retval == 0);
307 187 }
308
309 128 PageCacheTracker::OpenDirectives PageCacheTracker::Open(
310 uint64_t inode, const shash::Any &hash, const struct stat &info)
311 {
312 128 OpenDirectives open_directives;
313 // Old behavior: always flush page cache on open
314
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 128 if (!is_active_)
315 14 return open_directives;
316
317
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 114 if (inode != info.st_ino) {
318 ✗ PANIC(kLogStderr | kLogDebug,
319 "invalid entry on open: %" PRIu64 " with st_ino=%" PRIu64,
320 " hash=%s size=%" PRIu64, inode, info.st_ino, hash.ToString().c_str(),
321 info.st_size);
322 }
323
324 114 const MutexLockGuard guard(lock_);
325
326
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 114 Entry entry;
327
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 114 const bool retval = map_.Lookup(inode, &entry);
328
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 114 if (!retval) {
329 38 open_directives.keep_cache = true;
330 38 open_directives.direct_io = false;
331 38 statistics_.n_insert++;
332 38 statistics_.n_open_cached++;
333
334 38 entry.nopen = 1;
335
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 38 entry.idx_stat = stat_store_.Add(info);
336 38 entry.hash = hash;
337
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 38 map_.Insert(inode, entry);
338 38 return open_directives;
339 }
340
341
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 76 if (entry.hash == hash) {
342 50 open_directives.direct_io = false;
343
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 50 if (entry.nopen < 0) {
344 // The page cache is still in the transition phase and may contain old
345 // content. So trigger a flush of the cache in any case.
346 12 open_directives.keep_cache = false;
347 12 statistics_.n_open_flush++;
348 12 entry.nopen--;
349
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 12 map_.Insert(inode, entry);
350 12 return open_directives;
351 } else {
352 38 open_directives.keep_cache = true;
353 38 statistics_.n_open_cached++;
354
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 38 if (entry.nopen++ == 0)
355 ✗ entry.idx_stat = stat_store_.Add(info);
356
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 38 map_.Insert(inode, entry);
357 38 return open_directives;
358 }
359 }
360
361 // Page cache mismatch and old data has still open file attached to it,
362 // circumvent the page cache entirely and use direct I/O. In this case,
363 // cvmfs_close() will _not_ call Close().
364
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 26 if (entry.nopen != 0) {
365 14 open_directives.keep_cache = true;
366 14 open_directives.direct_io = true;
367 14 statistics_.n_open_direct++;
368 14 return open_directives;
369 }
370
371 // Stale data in the page cache, start the transition phase in which newly
372 // opened files flush the page cache and re-populate it with the new hash.
373 // The first file to reach Close() will finish the transition phase and
374 // mark the new hash as committed.
375 12 open_directives.direct_io = false;
376 12 open_directives.keep_cache = false;
377 12 statistics_.n_open_flush++;
378 12 entry.hash = hash;
379
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 12 entry.idx_stat = stat_store_.Add(info);
380 12 entry.nopen = -1;
381
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 12 map_.Insert(inode, entry);
382 12 return open_directives;
383 114 }
384
385 ✗ PageCacheTracker::OpenDirectives PageCacheTracker::OpenDirect() {
386 ✗ OpenDirectives open_directives(true, true);
387 // Old behavior: always flush page cache on open
388 ✗ if (!is_active_)
389 ✗ return open_directives;
390
391 ✗ const MutexLockGuard guard(lock_);
392 ✗ statistics_.n_open_direct++;
393 ✗ return open_directives;
394 }
395
396 100 void PageCacheTracker::Close(uint64_t inode) {
397
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 100 if (!is_active_)
398 14 return;
399
400 86 const MutexLockGuard guard(lock_);
401
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 86 Entry entry;
402
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 86 bool retval = map_.Lookup(inode, &entry);
403
404 86 if (!AssertOrLog(retval, kLogCvmfs, kLogSyslogWarn | kLogDebug,
405 "PageCacheTracker::Close Race condition? "
406 "Did not find inode %lu",
407 inode)
408
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 86 || !AssertOrLog(entry.nopen != 0, kLogCvmfs, kLogSyslogWarn | kLogDebug,
409 "PageCacheTracker::Close Race condition? "
410 "Inode %lu has no open entries",
411 inode)) {
412 ✗ return;
413 }
414
415 86 const int32_t old_open = entry.nopen;
416
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 86 if (entry.nopen < 0) {
417 // At this point we know that any stale data has been flushed from the
418 // cache and only data related to the currently booked content hash
419 // can be present. So clear the transition bit (sign bit).
420 12 entry.nopen = -entry.nopen;
421 }
422 86 entry.nopen--;
423
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 86 if (entry.nopen == 0) {
424 // File closed, remove struct stat information
425
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 37 if (entry.idx_stat < 0) {
426 ✗ PANIC(kLogSyslogErr | kLogDebug,
427 "page cache tracker: missing stat entry! Entry info: inode %" PRIu64
428 " - open counter %d - hash %s",
429 inode, old_open, entry.hash.ToString().c_str());
430 }
431
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 37 const uint64_t inode_update = stat_store_.Erase(entry.idx_stat);
432
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 37 Entry entry_update;
433
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 37 retval = map_.Lookup(inode_update, &entry_update);
434
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 37 if (!retval) {
435 ✗ PANIC(kLogSyslogErr | kLogDebug,
436 "invalid inode in page cache tracker: inode %" PRIu64
437 ", replacing %" PRIu64,
438 inode_update, inode);
439 }
440 37 entry_update.idx_stat = entry.idx_stat;
441
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 37 map_.Insert(inode_update, entry_update);
442 37 entry.idx_stat = -1;
443 }
444
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 86 map_.Insert(inode, entry);
445
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 86 }
446
447 26 PageCacheTracker::EvictRaii::EvictRaii(PageCacheTracker *t) : tracker_(t) {
448 26 const int retval = pthread_mutex_lock(tracker_->lock_);
449
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 26 assert(retval == 0);
450 26 }
451
452 26 PageCacheTracker::EvictRaii::~EvictRaii() {
453 26 const int retval = pthread_mutex_unlock(tracker_->lock_);
454
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 26 assert(retval == 0);
455 26 }
456
457 26 void PageCacheTracker::EvictRaii::Evict(uint64_t inode) {
458
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 26 if (!tracker_->is_active_)
459 14 return;
460
461 12 const bool contained_inode = tracker_->map_.Erase(inode);
462
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 12 if (contained_inode)
463 12 tracker_->statistics_.n_remove++;
464 }
465
466 } // namespace glue
467