GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/cache_posix.cc
Date: 2025-07-13 02:35:07
Exec Total Coverage
Lines: 284 322 88.2%
Branches: 168 267 62.9%
Line Branch Exec Source
1 /**
2 * This file is part of the CernVM File System.
3 *
4 * The cache module maintains the local file cache. Files are
5 * staged into the cache by Fetch(). The cache stores files with a name
6 * according to their content hash.
7 *
8 * The procedure is
9 * -# Look in the catalog for content hash
10 * -# If it is in local cache: return file descriptor
11 * -# Otherwise download, store in cache and return fd
12 *
13 * Each running CVMFS instance has to have a separate cache directory.
14 * The local cache directory (directories 00..ff) can be accessed
15 * in parallel to a running CVMFS, i.e. files can be deleted for instance
16 * anytime. However, this will confuse the cache database managed by the lru
17 * module.
18 *
19 * Files are created in txn directory first. At the very latest
20 * point they are renamed into their "real" content hash names atomically by
21 * rename(). This concept is taken over from GROW-FS.
22 *
23 * Identical URLs won't be concurrently downloaded. The first thread performs
24 * the download and informs the other, waiting threads on pipes.
25 */
26
27 #define __STDC_FORMAT_MACROS
28
29
30 #include "cache_posix.h"
31
32 #include <dirent.h>
33 #include <errno.h>
34 #include <fcntl.h>
35 #include <inttypes.h>
36 #include <pthread.h>
37 #include <sys/stat.h>
38 #include <sys/types.h>
39 #ifndef __APPLE__
40 #include <sys/statfs.h>
41 #endif
42 #include <unistd.h>
43
44 #include <algorithm>
45 #include <cassert>
46 #include <cstdio>
47 #include <cstdlib>
48 #include <cstring>
49 #include <map>
50 #include <vector>
51
52 #include "crypto/hash.h"
53 #include "crypto/signature.h"
54 #include "directory_entry.h"
55 #include "manifest.h"
56 #include "manifest_fetch.h"
57 #include "network/download.h"
58 #include "quota.h"
59 #include "shortstring.h"
60 #include "statistics.h"
61 #include "util/atomic.h"
62 #include "util/logging.h"
63 #include "util/platform.h"
64 #include "util/posix.h"
65 #include "util/smalloc.h"
66
67 using namespace std; // NOLINT
68
69 namespace {
70
71 /**
72 * A CallGuard object can be placed at the beginning of a function. It counts
73 * the number of so-annotated functions that are in flight. The Drainout() call
74 * will wait until all functions that have been called so far are finished.
75 *
76 * The class is used in order to wait for remaining calls when switching into
77 * the read-only cache mode.
78 */
79 class CallGuard {
80 public:
81 CallGuard() {
82 const int32_t global_drainout = atomic_read32(&global_drainout_);
83 drainout_ = (global_drainout != 0);
84 if (!drainout_)
85 atomic_inc32(&num_inflight_calls_);
86 }
87 ~CallGuard() {
88 if (!drainout_)
89 atomic_dec32(&num_inflight_calls_);
90 }
91 static void Drainout() {
92 atomic_cas32(&global_drainout_, 0, 1);
93 while (atomic_read32(&num_inflight_calls_) != 0)
94 SafeSleepMs(50);
95 }
96
97 private:
98 bool drainout_;
99 static atomic_int32 global_drainout_;
100 static atomic_int32 num_inflight_calls_;
101 };
102 atomic_int32 CallGuard::num_inflight_calls_ = 0;
103 atomic_int32 CallGuard::global_drainout_ = 0;
104
105 } // anonymous namespace
106
107
108 //------------------------------------------------------------------------------
109
110
111 const uint64_t PosixCacheManager::kBigFile = 25 * 1024 * 1024; // 25M
112
113
114 684 int PosixCacheManager::AbortTxn(void *txn) {
115 684 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
116 684 LogCvmfs(kLogCache, kLogDebug, "abort %s", transaction->tmp_path.c_str());
117 684 close(transaction->fd);
118 684 const int result = unlink(transaction->tmp_path.c_str());
119 684 transaction->~Transaction();
120 684 atomic_dec32(&no_inflight_txns_);
121
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 684 if (result == -1)
122 92 return -errno;
123 592 return 0;
124 }
125
126
127 /**
128 * This should only be used to replace the default NoopQuotaManager by a
129 * PosixQuotaManager. The cache manager takes the ownership of the passed
130 * quota manager.
131 */
132 396 bool PosixCacheManager::AcquireQuotaManager(QuotaManager *quota_mgr) {
133
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 396 if (quota_mgr == NULL)
134 ✗ return false;
135
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 396 delete quota_mgr_;
136 396 quota_mgr_ = quota_mgr;
137 396 return true;
138 }
139
140
141 1797 int PosixCacheManager::Close(int fd) {
142
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 1797 const int retval = do_refcount_ ? fd_mgr_->Close(fd) : close(fd);
143
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 1797 if (retval != 0)
144 46 return -errno;
145 1751 return 0;
146 }
147
148
149 4815 int PosixCacheManager::CommitTxn(void *txn) {
150 4815 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
151 int result;
152 4815 LogCvmfs(kLogCache, kLogDebug, "commit %s %s",
153 transaction->final_path.c_str(), transaction->tmp_path.c_str());
154
155 4815 result = Flush(transaction);
156 4815 close(transaction->fd);
157
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 4815 if (result < 0) {
158 46 unlink(transaction->tmp_path.c_str());
159 46 transaction->~Transaction();
160 46 atomic_dec32(&no_inflight_txns_);
161 46 return result;
162 }
163
164 // To support debugging, move files into quarantine on file size mismatch
165
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 4769 if (transaction->size != transaction->expected_size) {
166 // Allow size to be zero if alien cache, because hadoop-fuse-dfs returns
167 // size zero for a while
168
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 547 if ((transaction->expected_size != kSizeUnknown)
169
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 68 && (reports_correct_filesize_ || (transaction->size != 0))) {
170
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 68 LogCvmfs(kLogCache, kLogDebug | kLogSyslogErr,
171 "size check failure for %s, expected %lu, got %lu",
172 136 transaction->id.ToString().c_str(), transaction->expected_size,
173 transaction->size);
174
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 68 CopyPath2Path(transaction->tmp_path,
175
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 136 cache_path_ + "/quarantaine/" + transaction->id.ToString());
176 68 unlink(transaction->tmp_path.c_str());
177 68 transaction->~Transaction();
178 68 atomic_dec32(&no_inflight_txns_);
179 68 return -EIO;
180 }
181 }
182
183
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 4701 if ((transaction->label.flags & kLabelPinned)
184
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 4655 || (transaction->label.flags & kLabelCatalog)) {
185 1878 const bool retval = quota_mgr_->Pin(
186
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 626 transaction->id, transaction->size, transaction->label.GetDescription(),
187 626 (transaction->label.flags & kLabelCatalog));
188
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 626 if (!retval) {
189
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 46 LogCvmfs(kLogCache, kLogDebug, "commit failed: cannot pin %s",
190 92 transaction->id.ToString().c_str());
191 46 unlink(transaction->tmp_path.c_str());
192 46 transaction->~Transaction();
193 46 atomic_dec32(&no_inflight_txns_);
194 46 return -ENOSPC;
195 }
196 }
197
198 // Move the temporary file into its final location
199
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 4655 if (alien_cache_) {
200 46 const int retval = chmod(transaction->tmp_path.c_str(), 0660);
201
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 46 assert(retval == 0);
202 }
203 4655 result = Rename(transaction->tmp_path.c_str(),
204 transaction->final_path.c_str());
205
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 4655 if (result < 0) {
206 89 LogCvmfs(kLogCache, kLogDebug, "commit failed: %s", strerror(errno));
207 89 unlink(transaction->tmp_path.c_str());
208
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 89 if ((transaction->label.flags & kLabelPinned)
209
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 89 || (transaction->label.flags & kLabelCatalog)) {
210 46 quota_mgr_->Remove(transaction->id);
211 }
212 } else {
213 // Success, inform quota manager
214
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 4566 if (transaction->label.flags & kLabelVolatile) {
215
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 46 quota_mgr_->InsertVolatile(transaction->id, transaction->size,
216 92 transaction->label.GetDescription());
217 4520 } else if (!transaction->label.IsCatalog()
218
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 4520 && !transaction->label.IsPinned()) {
219
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 3986 quota_mgr_->Insert(transaction->id, transaction->size,
220 7972 transaction->label.GetDescription());
221 }
222 }
223 4655 transaction->~Transaction();
224 4655 atomic_dec32(&no_inflight_txns_);
225 4655 return result;
226 }
227
228 4077 bool PosixCacheManager::InitCacheDirectory(const string &cache_path) {
229
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 4077 const FileSystemInfo fs_info = GetFileSystemInfo(cache_path);
230
231
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 4077 if (fs_info.type == kFsTypeTmpfs) {
232 92 is_tmpfs_ = true;
233 }
234
235
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 4077 if (alien_cache_) {
236
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 1398 if (!MakeCacheDirectories(cache_path, 0770)) {
237 46 return false;
238 }
239
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 1352 LogCvmfs(kLogCache, kLogDebug | kLogSyslog,
240 "Cache directory structure created.");
241
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 1352 switch (fs_info.type) {
242 ✗ case kFsTypeNFS:
243 ✗ rename_workaround_ = kRenameLink;
244 ✗ LogCvmfs(kLogCache, kLogDebug | kLogSyslog, "Alien cache is on NFS.");
245 ✗ break;
246 ✗ case kFsTypeBeeGFS:
247 ✗ rename_workaround_ = kRenameSamedir;
248 ✗ LogCvmfs(kLogCache, kLogDebug | kLogSyslog,
249 "Alien cache is on BeeGFS.");
250 ✗ break;
251 1352 default:
252 1352 break;
253 }
254 } else {
255
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 2679 if (!MakeCacheDirectories(cache_path, 0700))
256 46 return false;
257 }
258
259 // TODO(jblomer): we might not need to look anymore for cvmfs 2.0 relicts
260
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 3985 if (FileExists(cache_path + "/cvmfscatalog.cache")) {
261
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 46 LogCvmfs(kLogCache, kLogDebug | kLogSyslogErr,
262 "Not mounting on cvmfs 2.0.X cache");
263 46 return false;
264 }
265 3939 return true;
266 }
267
268 4077 PosixCacheManager *PosixCacheManager::Create(
269 const string &cache_path,
270 const bool alien_cache,
271 const RenameWorkarounds rename_workaround,
272 const bool do_refcount) {
273 UniquePtr<PosixCacheManager> cache_manager(
274
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 4077 new PosixCacheManager(cache_path, alien_cache, do_refcount));
275
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 4077 assert(cache_manager.IsValid());
276
277 4077 cache_manager->rename_workaround_ = rename_workaround;
278
279
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 4077 const bool result_ = cache_manager->InitCacheDirectory(cache_path);
280
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 4077 if (!result_) {
281 138 return NULL;
282 }
283
284 3939 return cache_manager.Release();
285 4077 }
286
287
288 4321 void PosixCacheManager::CtrlTxn(const Label &label,
289 const int flags,
290 void *txn) {
291 4321 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
292 4321 transaction->label = label;
293 4321 }
294
295
296 ✗ string PosixCacheManager::Describe() {
297 ✗ string msg;
298 ✗ if (do_refcount_) {
299 msg = "Refcounting Posix cache manager"
300 "(cache directory: "
301 ✗ + cache_path_ + ")\n";
302 } else {
303 ✗ msg = "Posix cache manager (cache directory: " + cache_path_ + ")\n";
304 }
305 ✗ return msg;
306 }
307
308
309 /**
310 * If not refcounting, nothing to do, the kernel keeps the state
311 * of open file descriptors. Return a dummy memory location.
312 */
313 43 void *PosixCacheManager::DoSaveState() {
314
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 43 if (do_refcount_) {
315
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 43 SavedState *state = new SavedState();
316 43 state->fd_mgr = fd_mgr_->Clone();
317 43 return state;
318 }
319 ✗ char *c = reinterpret_cast<char *>(smalloc(1));
320 ✗ *c = kMagicNoRefcount;
321 ✗ return c;
322 }
323
324
325 43 int PosixCacheManager::DoRestoreState(void *data) {
326
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 43 assert(data);
327
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 43 if (do_refcount_) {
328 43 SavedState *state = reinterpret_cast<SavedState *>(data);
329
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 43 if (state->magic_number == kMagicRefcount) {
330 43 LogCvmfs(kLogCache, kLogDebug,
331 "Restoring refcount cache manager from "
332 "refcounted posix cache manager");
333
334 43 fd_mgr_->AssignFrom(state->fd_mgr.weak_ref());
335 } else {
336 ✗ LogCvmfs(kLogCache, kLogDebug,
337 "Restoring refcount cache manager from "
338 "non-refcounted posix cache manager");
339 }
340 43 return -1;
341 }
342
343 ✗ char *c = reinterpret_cast<char *>(data);
344 ✗ assert(*c == kMagicNoRefcount || *c == kMagicRefcount);
345 ✗ if (*c == kMagicRefcount) {
346 ✗ SavedState *state = reinterpret_cast<SavedState *>(data);
347 ✗ LogCvmfs(kLogCache, kLogDebug,
348 "Restoring non-refcount cache manager from "
349 "refcounted posix cache manager - this "
350 " is not possible, keep refcounting.");
351 ✗ fd_mgr_->AssignFrom(state->fd_mgr.weak_ref());
352 ✗ do_refcount_ = true;
353 }
354 ✗ return -1;
355 }
356
357
358 43 bool PosixCacheManager::DoFreeState(void *data) {
359
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 43 assert(data);
360 43 SavedState *state = reinterpret_cast<SavedState *>(data);
361
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 43 if (state->magic_number == kMagicRefcount) {
362
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 43 delete state;
363 } else {
364 // If not refcounted, the state is the dummy SavedState
365 // of the regular posix cache manager
366 ✗ free(data);
367 }
368 43 return true;
369 }
370
371
372 108 int PosixCacheManager::Dup(int fd) {
373
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 108 const int new_fd = do_refcount_ ? fd_mgr_->Dup(fd) : dup(fd);
374
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 108 if (new_fd < 0)
375 54 return -errno;
376 54 return new_fd;
377 }
378
379
380 8168 int PosixCacheManager::Flush(Transaction *transaction) {
381
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 8168 if (transaction->buf_pos == 0)
382 2022 return 0;
383 12292 const int written = write(transaction->fd, transaction->buffer,
384 6146 transaction->buf_pos);
385
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 6146 if (written < 0)
386 138 return -errno;
387
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 6008 if (static_cast<unsigned>(written) != transaction->buf_pos) {
388 ✗ transaction->buf_pos -= written;
389 ✗ return -EIO;
390 }
391 6008 transaction->buf_pos = 0;
392 6008 return 0;
393 }
394
395
396 8436 inline string PosixCacheManager::GetPathInCache(const shash::Any &id) {
397
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 16872 return cache_path_ + "/" + id.MakePathWithoutSuffix();
398 }
399
400
401 1369 int64_t PosixCacheManager::GetSize(int fd) {
402 platform_stat64 info;
403 1369 const int retval = platform_fstat(fd, &info);
404
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 1369 if (retval != 0)
405 46 return -errno;
406 1323 return info.st_size;
407 }
408
409
410 2880 int PosixCacheManager::Open(const LabeledObject &object) {
411
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 2880 const string path = GetPathInCache(object.id);
412 int result;
413
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 2880 if (do_refcount_) {
414
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 2880 result = fd_mgr_->Open(object.id, path);
415 } else {
416 ✗ result = open(path.c_str(), O_RDONLY);
417 }
418
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 2880 if (result >= 0) {
419
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 1117 LogCvmfs(kLogCache, kLogDebug, "hit %s", path.c_str());
420 // platform_disable_kcache(result);
421
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 1117 quota_mgr_->Touch(object.id);
422 } else {
423 1763 result = -errno;
424
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 1763 LogCvmfs(kLogCache, kLogDebug, "miss %s (%d)", path.c_str(), result);
425 }
426 2880 return result;
427 2880 }
428
429
430 707 int PosixCacheManager::OpenFromTxn(void *txn) {
431 707 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
432 707 const int retval = Flush(transaction);
433
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 707 if (retval < 0)
434 46 return retval;
435 int fd_rdonly;
436
437
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 661 if (do_refcount_) {
438
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 661 fd_rdonly = fd_mgr_->Open(transaction->id, transaction->tmp_path.c_str());
439 } else {
440 ✗ fd_rdonly = open(transaction->tmp_path.c_str(), O_RDONLY);
441 }
442
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 661 if (fd_rdonly == -1)
443 46 return -errno;
444 615 return fd_rdonly;
445 }
446
447
448 8351 int64_t PosixCacheManager::Pread(int fd,
449 void *buf,
450 uint64_t size,
451 uint64_t offset) {
452 int64_t result;
453 do {
454 8351 errno = 0;
455 8351 result = pread(fd, buf, size, offset);
456
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 8351 } while ((result == -1) && (errno == EINTR));
457
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 8351 if (result < 0)
458 92 return -errno;
459 8259 return result;
460 }
461
462
463 4913 int PosixCacheManager::Rename(const char *oldpath, const char *newpath) {
464 int result;
465
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 4913 if (rename_workaround_ != kRenameLink) {
466 4784 result = rename(oldpath, newpath);
467
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 4784 if (result < 0)
468 132 return -errno;
469 4652 return 0;
470 }
471
472 129 result = link(oldpath, newpath);
473
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 129 if (result < 0) {
474
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 86 if (errno == EEXIST) {
475 43 LogCvmfs(kLogCache, kLogDebug, "%s already existed, ignoring", newpath);
476 } else {
477 43 return -errno;
478 }
479 }
480 86 result = unlink(oldpath);
481
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 86 if (result < 0)
482 ✗ return -errno;
483 86 return 0;
484 }
485
486
487 /**
488 * Used by the sqlite vfs in order to preload file catalogs into the file system
489 * buffers.
490 *
491 * No-op if the fd is to a file that is on a tmpfs, and so already in page cache
492 */
493 462 int PosixCacheManager::Readahead(int fd) {
494 unsigned char *buf[4096];
495 int nbytes;
496 462 uint64_t pos = 0;
497
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 462 if (is_tmpfs()) {
498 ✗ return 0;
499 }
500 do {
501
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 2278 nbytes = Pread(fd, buf, 4096, pos);
502 2278 pos += nbytes;
503
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 2278 } while (nbytes == 4096);
504
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 462 LogCvmfs(kLogCache, kLogDebug, "read-ahead %d, %" PRIu64, fd, pos);
505
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 462 if (nbytes < 0)
506 ✗ return nbytes;
507 462 return 0;
508 }
509
510
511 198 int PosixCacheManager::Reset(void *txn) {
512 198 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
513 198 transaction->buf_pos = 0;
514 198 transaction->size = 0;
515 198 int retval = lseek(transaction->fd, 0, SEEK_SET);
516
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 198 if (retval < 0)
517 46 return -errno;
518 152 retval = ftruncate(transaction->fd, 0);
519
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 152 if (retval < 0)
520 ✗ return -errno;
521 152 return 0;
522 }
523
524
525 5645 int PosixCacheManager::StartTxn(const shash::Any &id,
526 uint64_t size,
527 void *txn) {
528 5645 atomic_inc32(&no_inflight_txns_);
529
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 5645 if (cache_mode_ == kCacheReadOnly) {
530 43 atomic_dec32(&no_inflight_txns_);
531 43 return -EROFS;
532 }
533
534
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 5602 if (size != kSizeUnknown) {
535
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 5017 if (size > quota_mgr_->GetMaxFileSize()) {
536
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 46 LogCvmfs(kLogCache, kLogDebug,
537 "file too big for lru cache (%" PRIu64 " "
538 "requested but only %" PRIu64 " bytes free)",
539
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 46 size, quota_mgr_->GetMaxFileSize());
540 46 atomic_dec32(&no_inflight_txns_);
541 46 return -ENOSPC;
542 }
543
544 // For large files, ensure enough free cache space before writing the chunk
545
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 4971 if (size > kBigFile) {
546
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 46 const uint64_t cache_size = quota_mgr_->GetSize();
547
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 46 const uint64_t cache_capacity = quota_mgr_->GetCapacity();
548
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 46 assert(cache_capacity >= size);
549
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 46 if ((cache_size + size) > cache_capacity) {
550 92 const uint64_t leave_size = std::min(cache_capacity / 2,
551 46 cache_capacity - size);
552
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 46 quota_mgr_->Cleanup(leave_size);
553 }
554 }
555 }
556
557
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 5556 string path_in_cache = GetPathInCache(id);
558
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 5556 Transaction *transaction = new (txn) Transaction(id, path_in_cache);
559
560 5556 char *template_path = NULL;
561 5556 unsigned temp_path_len = 0;
562
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 5556 if (rename_workaround_ == kRenameSamedir) {
563 92 temp_path_len = path_in_cache.length() + 6;
564 92 template_path = reinterpret_cast<char *>(alloca(temp_path_len + 1));
565 92 memcpy(template_path, path_in_cache.data(), path_in_cache.length());
566 92 memset(template_path + path_in_cache.length(), 'X', 6);
567 } else {
568 5464 temp_path_len = txn_template_path_.length();
569 5464 template_path = reinterpret_cast<char *>(alloca(temp_path_len + 1));
570
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 5464 memcpy(template_path, &txn_template_path_[0], temp_path_len);
571 }
572 5556 template_path[temp_path_len] = '\0';
573
574
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 5556 transaction->fd = mkstemp(template_path);
575
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 5556 if (transaction->fd == -1) {
576 57 transaction->~Transaction();
577 57 atomic_dec32(&no_inflight_txns_);
578 57 return -errno;
579 }
580
581
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 5499 LogCvmfs(kLogCache, kLogDebug, "start transaction on %s has result %d",
582 template_path, transaction->fd);
583
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 5499 transaction->tmp_path = template_path;
584 5499 transaction->expected_size = size;
585 5499 return transaction->fd;
586 5556 }
587
588
589 152 manifest::Breadcrumb PosixCacheManager::LoadBreadcrumb(
590 const std::string &fqrn) {
591 152 return manifest::Manifest::ReadBreadcrumb(fqrn, cache_path_);
592 }
593
594
595 38 bool PosixCacheManager::StoreBreadcrumb(const manifest::Manifest &manifest) {
596 38 return manifest.ExportBreadcrumb(cache_path_, 0600);
597 }
598
599
600 ✗ bool PosixCacheManager::StoreBreadcrumb(std::string fqrn,
601 manifest::Breadcrumb breadcrumb) {
602 ✗ return breadcrumb.Export(fqrn, cache_path_, 0600);
603 }
604
605
606 172 void PosixCacheManager::TearDown2ReadOnly() {
607 172 cache_mode_ = kCacheReadOnly;
608
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 731 while (atomic_read32(&no_inflight_txns_) != 0)
609 602 SafeSleepMs(50);
610
611 129 QuotaManager *old_manager = quota_mgr_;
612
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 129 quota_mgr_ = new NoopQuotaManager();
613
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 129 delete old_manager;
614 129 }
615
616
617 5412 int64_t PosixCacheManager::Write(const void *buf, uint64_t size, void *txn) {
618 5412 Transaction *transaction = reinterpret_cast<Transaction *>(txn);
619
620
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 5412 if (transaction->expected_size != kSizeUnknown) {
621
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 4480 if (transaction->size + size > transaction->expected_size) {
622 46 LogCvmfs(kLogCache, kLogDebug,
623 "Transaction size (%" PRIu64 ") > expected size (%" PRIu64 ")",
624 46 transaction->size + size, transaction->expected_size);
625 46 return -EFBIG;
626 }
627 }
628
629 5366 uint64_t written = 0;
630 5366 const unsigned char *read_pos = reinterpret_cast<const unsigned char *>(buf);
631
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 11626 while (written < size) {
632
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 6306 if (transaction->buf_pos == sizeof(transaction->buffer)) {
633
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 2646 const int retval = Flush(transaction);
634
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 2646 if (retval != 0) {
635 46 transaction->size += written;
636 46 return retval;
637 }
638 }
639 6260 const uint64_t remaining = size - written;
640 6260 const uint64_t space_in_buffer = sizeof(transaction->buffer)
641 6260 - transaction->buf_pos;
642 6260 const uint64_t batch_size = std::min(remaining, space_in_buffer);
643 6260 memcpy(transaction->buffer + transaction->buf_pos, read_pos, batch_size);
644 6260 transaction->buf_pos += batch_size;
645 6260 written += batch_size;
646 6260 read_pos += batch_size;
647 }
648 5320 transaction->size += written;
649 5320 return written;
650 }
651