XRootD
XrdPfc.cc
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1 //----------------------------------------------------------------------------------
2 // Copyright (c) 2014 by Board of Trustees of the Leland Stanford, Jr., University
3 // Author: Alja Mrak-Tadel, Matevz Tadel, Brian Bockelman
4 //----------------------------------------------------------------------------------
5 // XRootD is free software: you can redistribute it and/or modify
6 // it under the terms of the GNU Lesser General Public License as published by
7 // the Free Software Foundation, either version 3 of the License, or
8 // (at your option) any later version.
9 //
10 // XRootD is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 // GNU General Public License for more details.
14 //
15 // You should have received a copy of the GNU Lesser General Public License
16 // along with XRootD. If not, see <http://www.gnu.org/licenses/>.
17 //----------------------------------------------------------------------------------
18 
19 #include <fcntl.h>
20 #include <sstream>
21 #include <algorithm>
22 #include <sys/statvfs.h>
23 
24 #include "XrdCl/XrdClURL.hh"
25 
26 #include "XrdOuc/XrdOucEnv.hh"
27 #include "XrdOuc/XrdOucUtils.hh"
29 
30 #include "XrdSys/XrdSysTimer.hh"
31 #include "XrdSys/XrdSysTrace.hh"
32 #include "XrdSys/XrdSysXAttr.hh"
33 
35 
36 #include "XrdOss/XrdOss.hh"
37 
38 #include "XrdPfc.hh"
39 #include "XrdPfcTrace.hh"
40 #include "XrdPfcFSctl.hh"
41 #include "XrdPfcInfo.hh"
42 #include "XrdPfcIOFile.hh"
43 #include "XrdPfcIOFileBlock.hh"
44 #include "XrdPfcResourceMonitor.hh"
45 
47 
48 using namespace XrdPfc;
49 
50 Cache *Cache::m_instance = nullptr;
51 XrdScheduler *Cache::schedP = nullptr;
52 
53 
55 {
57  return 0;
58 }
59 
61 {
63  return 0;
64 }
65 
66 void *PrefetchThread(void*)
67 {
69  return 0;
70 }
71 
72 //==============================================================================
73 
74 extern "C"
75 {
77  const char *config_filename,
78  const char *parameters,
79  XrdOucEnv *env)
80 {
81  XrdSysError err(logger, "");
82  err.Say("++++++ Proxy file cache initialization started.");
83 
84  if ( ! env ||
85  ! (XrdPfc::Cache::schedP = (XrdScheduler*) env->GetPtr("XrdScheduler*")))
86  {
89  }
90 
91  Cache &instance = Cache::CreateInstance(logger, env);
92 
93  if (! instance.Config(config_filename, parameters))
94  {
95  err.Say("Config Proxy file cache initialization failed.");
96  return 0;
97  }
98  err.Say("++++++ Proxy file cache initialization completed.");
99 
100  {
101  pthread_t tid;
102 
103  XrdSysThread::Run(&tid, ResourceMonitorThread, 0, 0, "XrdPfc ResourceMonitor");
104 
105  for (int wti = 0; wti < instance.RefConfiguration().m_wqueue_threads; ++wti)
106  {
107  XrdSysThread::Run(&tid, ProcessWriteTaskThread, 0, 0, "XrdPfc WriteTasks ");
108  }
109 
110  if (instance.RefConfiguration().m_prefetch_max_blocks > 0)
111  {
112  XrdSysThread::Run(&tid, PrefetchThread, 0, 0, "XrdPfc Prefetch ");
113  }
114  }
115 
116  XrdPfcFSctl* pfcFSctl = new XrdPfcFSctl(instance, logger);
117  env->PutPtr("XrdFSCtl_PC*", pfcFSctl);
118 
119  return &instance;
120 }
121 }
122 
123 //==============================================================================
124 
126 {
127  assert (m_instance == 0);
128  m_instance = new Cache(logger, env);
129  return *m_instance;
130 }
131 
132  Cache& Cache::GetInstance() { return *m_instance; }
133 const Cache& Cache::TheOne() { return *m_instance; }
134 const Configuration& Cache::Conf() { return m_instance->RefConfiguration(); }
135  ResourceMonitor& Cache::ResMon() { return m_instance->RefResMon(); }
136 
138 {
139  if (! m_decisionpoints.empty())
140  {
141  XrdCl::URL url(io->Path());
142  std::string filename = url.GetPath();
143  std::vector<Decision*>::const_iterator it;
144  for (it = m_decisionpoints.begin(); it != m_decisionpoints.end(); ++it)
145  {
146  XrdPfc::Decision *d = *it;
147  if (! d) continue;
148  if (! d->Decide(filename, *m_oss))
149  {
150  return false;
151  }
152  }
153  }
154 
155  return true;
156 }
157 
159  XrdOucCache("pfc"),
160  m_env(env),
161  m_log(logger, "XrdPfc_"),
162  m_trace(new XrdSysTrace("XrdPfc", logger)),
163  m_traceID("Cache"),
164  m_oss(0),
165  m_gstream(0),
166  m_purge_pin(0),
167  m_prefetch_condVar(0),
168  m_prefetch_enabled(false),
169  m_RAM_used(0),
170  m_RAM_write_queue(0),
171  m_RAM_std_size(0),
172  m_isClient(false),
173  m_active_cond(0)
174 {
175  // Default log level is Warning.
176  m_trace->What = 2;
177 }
178 
180 {
181  const char* tpfx = "Attach() ";
182 
183  if (Cache::GetInstance().Decide(io))
184  {
185  TRACE(Info, tpfx << obfuscateAuth(io->Path()));
186 
187  IO *cio;
188 
189  if (Cache::GetInstance().RefConfiguration().m_hdfsmode)
190  {
191  cio = new IOFileBlock(io, *this);
192  }
193  else
194  {
195  IOFile *iof = new IOFile(io, *this);
196 
197  if ( ! iof->HasFile())
198  {
199  delete iof;
200  // TODO - redirect instead. But this is kind of an awkward place for it.
201  // errno is set during IOFile construction.
202  TRACE(Error, tpfx << "Failed opening local file, falling back to remote access " << io->Path());
203  return io;
204  }
205 
206  cio = iof;
207  }
208 
209  TRACE_PC(Debug, const char* loc = io->Location(), tpfx << io->Path() << " location: " <<
210  ((loc && loc[0] != 0) ? loc : "<deferred open>"));
211 
212  return cio;
213  }
214  else
215  {
216  TRACE(Info, tpfx << "decision decline " << io->Path());
217  }
218  return io;
219 }
220 
221 void Cache::AddWriteTask(Block* b, bool fromRead)
222 {
223  TRACE(Dump, "AddWriteTask() offset=" << b->m_offset << ". file " << b->get_file()->GetLocalPath());
224 
225  {
226  XrdSysMutexHelper lock(&m_RAM_mutex);
227  m_RAM_write_queue += b->get_size();
228  }
229 
230  m_writeQ.condVar.Lock();
231  if (fromRead)
232  m_writeQ.queue.push_back(b);
233  else
234  m_writeQ.queue.push_front(b);
235  m_writeQ.size++;
236  m_writeQ.condVar.Signal();
237  m_writeQ.condVar.UnLock();
238 }
239 
241 {
242  std::list<Block*> removed_blocks;
243  long long sum_size = 0;
244 
245  m_writeQ.condVar.Lock();
246  std::list<Block*>::iterator i = m_writeQ.queue.begin();
247  while (i != m_writeQ.queue.end())
248  {
249  if ((*i)->m_file == file)
250  {
251  TRACE(Dump, "Remove entries for " << (void*)(*i) << " path " << file->lPath());
252  std::list<Block*>::iterator j = i++;
253  removed_blocks.push_back(*j);
254  sum_size += (*j)->get_size();
255  m_writeQ.queue.erase(j);
256  --m_writeQ.size;
257  }
258  else
259  {
260  ++i;
261  }
262  }
263  m_writeQ.condVar.UnLock();
264 
265  {
266  XrdSysMutexHelper lock(&m_RAM_mutex);
267  m_RAM_write_queue -= sum_size;
268  }
269 
270  file->BlocksRemovedFromWriteQ(removed_blocks);
271 }
272 
274 {
275  std::vector<Block*> blks_to_write(m_configuration.m_wqueue_blocks);
276 
277  while (true)
278  {
279  m_writeQ.condVar.Lock();
280  while (m_writeQ.size == 0)
281  {
282  m_writeQ.condVar.Wait();
283  }
284 
285  // MT -- optimize to pop several blocks if they are available (or swap the list).
286  // This makes sense especially for smallish block sizes.
287 
288  int n_pushed = std::min(m_writeQ.size, m_configuration.m_wqueue_blocks);
289  long long sum_size = 0;
290 
291  for (int bi = 0; bi < n_pushed; ++bi)
292  {
293  Block* block = m_writeQ.queue.front();
294  m_writeQ.queue.pop_front();
295  m_writeQ.writes_between_purges += block->get_size();
296  sum_size += block->get_size();
297 
298  blks_to_write[bi] = block;
299 
300  TRACE(Dump, "ProcessWriteTasks for block " << (void*)(block) << " path " << block->m_file->lPath());
301  }
302  m_writeQ.size -= n_pushed;
303 
304  m_writeQ.condVar.UnLock();
305 
306  {
307  XrdSysMutexHelper lock(&m_RAM_mutex);
308  m_RAM_write_queue -= sum_size;
309  }
310 
311  for (int bi = 0; bi < n_pushed; ++bi)
312  {
313  Block* block = blks_to_write[bi];
314 
315  block->m_file->WriteBlockToDisk(block);
316  }
317  }
318 }
319 
321 {
322  // Called from ResourceMonitor for an alternative estimation of disk writes.
323  XrdSysCondVarHelper lock(&m_writeQ.condVar);
324  long long ret = m_writeQ.writes_between_purges;
325  m_writeQ.writes_between_purges = 0;
326  return ret;
327 }
328 
329 //==============================================================================
330 
331 char* Cache::RequestRAM(long long size)
332 {
333  static const size_t s_block_align = sysconf(_SC_PAGESIZE);
334 
335  bool std_size = (size == m_configuration.m_bufferSize);
336 
337  m_RAM_mutex.Lock();
338 
339  long long total = m_RAM_used + size;
340 
341  if (total <= m_configuration.m_RamAbsAvailable)
342  {
343  m_RAM_used = total;
344  if (std_size && m_RAM_std_size > 0)
345  {
346  char *buf = m_RAM_std_blocks.back();
347  m_RAM_std_blocks.pop_back();
348  --m_RAM_std_size;
349 
350  m_RAM_mutex.UnLock();
351 
352  return buf;
353  }
354  else
355  {
356  m_RAM_mutex.UnLock();
357  char *buf;
358  if (posix_memalign((void**) &buf, s_block_align, (size_t) size))
359  {
360  // Report out of mem? Probably should report it at least the first time,
361  // then periodically.
362  return 0;
363  }
364  return buf;
365  }
366  }
367  m_RAM_mutex.UnLock();
368  return 0;
369 }
370 
371 void Cache::ReleaseRAM(char* buf, long long size)
372 {
373  bool std_size = (size == m_configuration.m_bufferSize);
374  {
375  XrdSysMutexHelper lock(&m_RAM_mutex);
376 
377  m_RAM_used -= size;
378 
379  if (std_size && m_RAM_std_size < m_configuration.m_RamKeepStdBlocks)
380  {
381  m_RAM_std_blocks.push_back(buf);
382  ++m_RAM_std_size;
383  return;
384  }
385  }
386  free(buf);
387 }
388 
389 File* Cache::GetFile(const std::string& path, IO* io, long long off, long long filesize)
390 {
391  // Called from virtual IOFile constructor.
392 
393  TRACE(Debug, "GetFile " << path << ", io " << io);
394 
395  ActiveMap_i it;
396 
397  {
398  XrdSysCondVarHelper lock(&m_active_cond);
399 
400  while (true)
401  {
402  it = m_active.find(path);
403 
404  // File is not open or being opened. Mark it as being opened and
405  // proceed to opening it outside of while loop.
406  if (it == m_active.end())
407  {
408  it = m_active.insert(std::make_pair(path, (File*) 0)).first;
409  break;
410  }
411 
412  if (it->second != 0)
413  {
414  it->second->AddIO(io);
415  inc_ref_cnt(it->second, false, true);
416 
417  return it->second;
418  }
419  else
420  {
421  // Wait for some change in m_active, then recheck.
422  m_active_cond.Wait();
423  }
424  }
425  }
426 
427  // This is always true, now that IOFileBlock is unsupported.
428  if (filesize == 0)
429  {
430  struct stat st;
431  int res = io->Fstat(st);
432  if (res < 0) {
433  errno = res;
434  TRACE(Error, "GetFile, could not get valid stat");
435  } else if (res > 0) {
436  errno = ENOTSUP;
437  TRACE(Error, "GetFile, stat returned positive value, this should NOT happen here");
438  } else {
439  filesize = st.st_size;
440  }
441  }
442 
443  File *file = 0;
444 
445  if (filesize >= 0)
446  {
447  file = File::FileOpen(path, off, filesize);
448  }
449 
450  {
451  XrdSysCondVarHelper lock(&m_active_cond);
452 
453  if (file)
454  {
455  inc_ref_cnt(file, false, true);
456  it->second = file;
457 
458  file->AddIO(io);
459  }
460  else
461  {
462  m_active.erase(it);
463  }
464 
465  m_active_cond.Broadcast();
466  }
467 
468  return file;
469 }
470 
472 {
473  // Called from virtual IO::DetachFinalize.
474 
475  TRACE(Debug, "ReleaseFile " << f->GetLocalPath() << ", io " << io);
476 
477  {
478  XrdSysCondVarHelper lock(&m_active_cond);
479 
480  f->RemoveIO(io);
481  }
482  dec_ref_cnt(f, true);
483 }
484 
485 
486 namespace
487 {
488 
489 class DiskSyncer : public XrdJob
490 {
491 private:
492  File *m_file;
493  bool m_high_debug;
494 
495 public:
496  DiskSyncer(File *f, bool high_debug, const char *desc = "") :
497  XrdJob(desc),
498  m_file(f),
499  m_high_debug(high_debug)
500  {}
501 
502  void DoIt()
503  {
504  m_file->Sync();
505  Cache::GetInstance().FileSyncDone(m_file, m_high_debug);
506  delete this;
507  }
508 };
509 
510 
511 class CommandExecutor : public XrdJob
512 {
513 private:
514  std::string m_command_url;
515 
516 public:
517  CommandExecutor(const std::string& command, const char *desc = "") :
518  XrdJob(desc),
519  m_command_url(command)
520  {}
521 
522  void DoIt()
523  {
524  Cache::GetInstance().ExecuteCommandUrl(m_command_url);
525  delete this;
526  }
527 };
528 
529 }
530 
531 //==============================================================================
532 
533 void Cache::schedule_file_sync(File* f, bool ref_cnt_already_set, bool high_debug)
534 {
535  DiskSyncer* ds = new DiskSyncer(f, high_debug);
536 
537  if ( ! ref_cnt_already_set) inc_ref_cnt(f, true, high_debug);
538 
539  schedP->Schedule(ds);
540 }
541 
542 void Cache::FileSyncDone(File* f, bool high_debug)
543 {
544  dec_ref_cnt(f, high_debug);
545 }
546 
547 void Cache::inc_ref_cnt(File* f, bool lock, bool high_debug)
548 {
549  // called from GetFile() or SheduleFileSync();
550 
551  int tlvl = high_debug ? TRACE_Debug : TRACE_Dump;
552 
553  if (lock) m_active_cond.Lock();
554  int rc = f->inc_ref_cnt();
555  if (lock) m_active_cond.UnLock();
556 
557  TRACE_INT(tlvl, "inc_ref_cnt " << f->GetLocalPath() << ", cnt at exit = " << rc);
558 }
559 
560 void Cache::dec_ref_cnt(File* f, bool high_debug)
561 {
562  // NOT under active lock.
563  // Called from ReleaseFile(), DiskSync callback and stat-like functions.
564 
565  int tlvl = high_debug ? TRACE_Debug : TRACE_Dump;
566  int cnt;
567 
568  bool emergency_close = false;
569  {
570  XrdSysCondVarHelper lock(&m_active_cond);
571 
572  cnt = f->get_ref_cnt();
573  TRACE_INT(tlvl, "dec_ref_cnt " << f->GetLocalPath() << ", cnt at entry = " << cnt);
574 
575  if (f->is_in_emergency_shutdown())
576  {
577  // In this case file has been already removed from m_active map and
578  // does not need to be synced.
579 
580  if (cnt == 1)
581  {
582  TRACE_INT(tlvl, "dec_ref_cnt " << f->GetLocalPath() << " is in shutdown, ref_cnt = " << cnt
583  << " -- closing and deleting File object without further ado");
584  emergency_close = true;
585  }
586  else
587  {
588  TRACE_INT(tlvl, "dec_ref_cnt " << f->GetLocalPath() << " is in shutdown, ref_cnt = " << cnt
589  << " -- waiting");
590  f->dec_ref_cnt();
591  return;
592  }
593  }
594  if (cnt > 1)
595  {
596  f->dec_ref_cnt();
597  return;
598  }
599  }
600  if (emergency_close)
601  {
602  f->Close();
603  delete f;
604  return;
605  }
606 
607  if (cnt == 1)
608  {
609  if (f->FinalizeSyncBeforeExit())
610  {
611  // Note, here we "reuse" the existing reference count for the
612  // final sync.
613 
614  TRACE(Debug, "dec_ref_cnt " << f->GetLocalPath() << ", scheduling final sync");
615  schedule_file_sync(f, true, true);
616  return;
617  }
618  }
619 
620  bool finished_p = false;
621  ActiveMap_i act_it;
622  {
623  XrdSysCondVarHelper lock(&m_active_cond);
624 
625  cnt = f->dec_ref_cnt();
626  TRACE_INT(tlvl, "dec_ref_cnt " << f->GetLocalPath() << ", cnt after sync_check and dec_ref_cnt = " << cnt);
627  if (cnt == 0)
628  {
629  act_it = m_active.find(f->GetLocalPath());
630  act_it->second = 0;
631 
632  finished_p = true;
633  }
634  }
635  if (finished_p)
636  {
637  f->Close();
638  {
639  XrdSysCondVarHelper lock(&m_active_cond);
640  m_active.erase(act_it);
641  }
642 
643  if (m_gstream)
644  {
645  const Stats &st = f->RefStats();
646  const Info::AStat *as = f->GetLastAccessStats();
647 
648  char buf[4096];
649  int len = snprintf(buf, 4096, "{\"event\":\"file_close\","
650  "\"lfn\":\"%s\",\"size\":%lld,\"blk_size\":%d,\"n_blks\":%d,\"n_blks_done\":%d,"
651  "\"access_cnt\":%lu,\"attach_t\":%lld,\"detach_t\":%lld,\"remotes\":%s,"
652  "\"b_hit\":%lld,\"b_miss\":%lld,\"b_bypass\":%lld,"
653  "\"b_todisk\":%lld,\"b_prefetch\":%lld,\"n_cks_errs\":%d}",
654  f->GetLocalPath().c_str(), f->GetFileSize(), f->GetBlockSize(),
655  f->GetNBlocks(), f->GetNDownloadedBlocks(),
656  (unsigned long) f->GetAccessCnt(), (long long) as->AttachTime, (long long) as->DetachTime,
657  f->GetRemoteLocations().c_str(),
658  as->BytesHit, as->BytesMissed, as->BytesBypassed,
660  );
661  bool suc = false;
662  if (len < 4096)
663  {
664  suc = m_gstream->Insert(buf, len + 1);
665  }
666  if ( ! suc)
667  {
668  TRACE(Error, "Failed g-stream insertion of file_close record, len=" << len);
669  }
670  }
671 
672  delete f;
673  }
674 }
675 
676 bool Cache::IsFileActiveOrPurgeProtected(const std::string& path) const
677 {
678  XrdSysCondVarHelper lock(&m_active_cond);
679 
680  return m_active.find(path) != m_active.end() ||
681  m_purge_delay_set.find(path) != m_purge_delay_set.end();
682 }
683 
685 {
686  XrdSysCondVarHelper lock(&m_active_cond);
687  m_purge_delay_set.clear();
688 }
689 
690 //==============================================================================
691 //=== PREFETCH
692 //==============================================================================
693 
695 {
696  // Can be called with other locks held.
697 
698  if ( ! m_prefetch_enabled)
699  {
700  return;
701  }
702 
703  m_prefetch_condVar.Lock();
704  m_prefetchList.push_back(file);
705  m_prefetch_condVar.Signal();
706  m_prefetch_condVar.UnLock();
707 }
708 
709 
711 {
712  // Can be called with other locks held.
713 
714  if ( ! m_prefetch_enabled)
715  {
716  return;
717  }
718 
719  m_prefetch_condVar.Lock();
720  for (PrefetchList::iterator it = m_prefetchList.begin(); it != m_prefetchList.end(); ++it)
721  {
722  if (*it == file)
723  {
724  m_prefetchList.erase(it);
725  break;
726  }
727  }
728  m_prefetch_condVar.UnLock();
729 }
730 
731 
733 {
734  m_prefetch_condVar.Lock();
735  while (m_prefetchList.empty())
736  {
737  m_prefetch_condVar.Wait();
738  }
739 
740  // std::sort(m_prefetchList.begin(), m_prefetchList.end(), myobject);
741 
742  size_t l = m_prefetchList.size();
743  int idx = rand() % l;
744  File* f = m_prefetchList[idx];
745 
746  m_prefetch_condVar.UnLock();
747  return f;
748 }
749 
750 
752 {
753  const long long limit_RAM = m_configuration.m_RamAbsAvailable * 7 / 10;
754 
755  while (true)
756  {
757  m_RAM_mutex.Lock();
758  bool doPrefetch = (m_RAM_used < limit_RAM);
759  m_RAM_mutex.UnLock();
760 
761  if (doPrefetch)
762  {
764  f->Prefetch();
765  }
766  else
767  {
769  }
770  }
771 }
772 
773 
774 //==============================================================================
775 //=== Virtuals from XrdOucCache
776 //==============================================================================
777 
778 //------------------------------------------------------------------------------
792 
793 int Cache::LocalFilePath(const char *curl, char *buff, int blen,
794  LFP_Reason why, bool forall)
795 {
796  static const mode_t groupReadable = S_IRUSR | S_IWUSR | S_IRGRP;
797  static const mode_t worldReadable = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
798  static const char *lfpReason[] = { "ForAccess", "ForInfo", "ForPath" };
799 
800  TRACE(Debug, "LocalFilePath '" << curl << "', why=" << lfpReason[why]);
801 
802  if (buff && blen > 0) buff[0] = 0;
803 
804  XrdCl::URL url(curl);
805  std::string f_name = url.GetPath();
806  std::string i_name = f_name + Info::s_infoExtension;
807 
808  if (why == ForPath)
809  {
810  int ret = m_oss->Lfn2Pfn(f_name.c_str(), buff, blen);
811  TRACE(Info, "LocalFilePath '" << curl << "', why=" << lfpReason[why] << " -> " << ret);
812  return ret;
813  }
814 
815  {
816  XrdSysCondVarHelper lock(&m_active_cond);
817  m_purge_delay_set.insert(f_name);
818  }
819 
820  struct stat sbuff, sbuff2;
821  if (m_oss->Stat(f_name.c_str(), &sbuff) == XrdOssOK &&
822  m_oss->Stat(i_name.c_str(), &sbuff2) == XrdOssOK)
823  {
824  if (S_ISDIR(sbuff.st_mode))
825  {
826  TRACE(Info, "LocalFilePath '" << curl << "', why=" << lfpReason[why] << " -> EISDIR");
827  return -EISDIR;
828  }
829  else
830  {
831  bool read_ok = false;
832  bool is_complete = false;
833 
834  // Lock and check if the file is active. If NOT, keep the lock
835  // and add dummy access after successful reading of info file.
836  // If it IS active, just release the lock, this ongoing access will
837  // assure the file continues to exist.
838 
839  // XXXX How can I just loop over the cinfo file when active?
840  // Can I not get is_complete from the existing file?
841  // Do I still want to inject access record?
842  // Oh, it writes only if not active .... still let's try to use existing File.
843 
844  m_active_cond.Lock();
845 
846  bool is_active = m_active.find(f_name) != m_active.end();
847 
848  if (is_active) m_active_cond.UnLock();
849 
850  XrdOssDF* infoFile = m_oss->newFile(m_configuration.m_username.c_str());
851  XrdOucEnv myEnv;
852  int res = infoFile->Open(i_name.c_str(), O_RDWR, 0600, myEnv);
853  if (res >= 0)
854  {
855  Info info(m_trace, 0);
856  if (info.Read(infoFile, i_name.c_str()))
857  {
858  read_ok = true;
859 
860  is_complete = info.IsComplete();
861 
862  // Add full-size access if reason is for access.
863  if ( ! is_active && is_complete && why == ForAccess)
864  {
865  info.WriteIOStatSingle(info.GetFileSize());
866  info.Write(infoFile, i_name.c_str());
867  }
868  }
869  infoFile->Close();
870  }
871  delete infoFile;
872 
873  if ( ! is_active) m_active_cond.UnLock();
874 
875  if (read_ok)
876  {
877  if ((is_complete || why == ForInfo) && buff != 0)
878  {
879  int res2 = m_oss->Lfn2Pfn(f_name.c_str(), buff, blen);
880  if (res2 < 0)
881  return res2;
882 
883  // Normally, files are owned by us but when direct cache access
884  // is wanted and possible, make sure the file is world readable.
885  if (why == ForAccess)
886  {mode_t mode = (forall ? worldReadable : groupReadable);
887  if (((sbuff.st_mode & worldReadable) != mode)
888  && (m_oss->Chmod(f_name.c_str(), mode) != XrdOssOK))
889  {is_complete = false;
890  *buff = 0;
891  }
892  }
893  }
894 
895  TRACE(Info, "LocalFilePath '" << curl << "', why=" << lfpReason[why] <<
896  (is_complete ? " -> FILE_COMPLETE_IN_CACHE" : " -> EREMOTE"));
897 
898  return is_complete ? 0 : -EREMOTE;
899  }
900  }
901  }
902 
903  TRACE(Info, "LocalFilePath '" << curl << "', why=" << lfpReason[why] << " -> ENOENT");
904  return -ENOENT;
905 }
906 
907 //______________________________________________________________________________
908 // If supported, write file_size as xattr to cinfo file.
909 //------------------------------------------------------------------------------
910 void Cache::WriteFileSizeXAttr(int cinfo_fd, long long file_size)
911 {
912  if (m_metaXattr) {
913  int res = XrdSysXAttrActive->Set("pfc.fsize", &file_size, sizeof(long long), 0, cinfo_fd, 0);
914  if (res != 0) {
915  TRACE(Debug, "WriteFileSizeXAttr error setting xattr " << res);
916  }
917  }
918 }
919 
920 //______________________________________________________________________________
921 // Determine full size of the data file from the corresponding cinfo-file name.
922 // Attempts to read xattr first and falls back to reading of the cinfo file.
923 // Returns -error on failure.
924 //------------------------------------------------------------------------------
925 long long Cache::DetermineFullFileSize(const std::string &cinfo_fname)
926 {
927  if (m_metaXattr) {
928  char pfn[4096];
929  m_oss->Lfn2Pfn(cinfo_fname.c_str(), pfn, 4096);
930  long long fsize = -1ll;
931  int res = XrdSysXAttrActive->Get("pfc.fsize", &fsize, sizeof(long long), pfn);
932  if (res == sizeof(long long))
933  {
934  return fsize;
935  }
936  else
937  {
938  TRACE(Debug, "DetermineFullFileSize error getting xattr " << res);
939  }
940  }
941 
942  XrdOssDF *infoFile = m_oss->newFile(m_configuration.m_username.c_str());
943  XrdOucEnv env;
944  long long ret;
945  int res = infoFile->Open(cinfo_fname.c_str(), O_RDONLY, 0600, env);
946  if (res < 0) {
947  ret = res;
948  } else {
949  Info info(m_trace, 0);
950  if ( ! info.Read(infoFile, cinfo_fname.c_str())) {
951  ret = -EBADF;
952  } else {
953  ret = info.GetFileSize();
954  }
955  infoFile->Close();
956  }
957  delete infoFile;
958  return ret;
959 }
960 
961 //______________________________________________________________________________
962 // Calculate if the file is to be considered cached for the purposes of
963 // only-if-cached and setting of atime of the Stat() calls.
964 // Returns true if the file is to be conidered cached.
965 //------------------------------------------------------------------------------
966 bool Cache::DecideIfConsideredCached(long long file_size, long long bytes_on_disk)
967 {
968  if (file_size == 0 || bytes_on_disk >= file_size)
969  return true;
970 
971  double frac_on_disk = (double) bytes_on_disk / file_size;
972 
973  if (file_size <= m_configuration.m_onlyIfCachedMinSize)
974  {
975  if (frac_on_disk >= m_configuration.m_onlyIfCachedMinFrac)
976  return true;
977  }
978  else
979  {
980  if (bytes_on_disk >= m_configuration.m_onlyIfCachedMinSize &&
981  frac_on_disk >= m_configuration.m_onlyIfCachedMinFrac)
982  return true;
983  }
984  return false;
985 }
986 
987 //______________________________________________________________________________
988 // Check if the file is cached including m_onlyIfCachedMinSize and m_onlyIfCachedMinFrac
989 // pfc configuration parameters. The logic of accessing the Info file is the same
990 // as in Cache::LocalFilePath.
998 //------------------------------------------------------------------------------
999 int Cache::ConsiderCached(const char *curl)
1000 {
1001  static const char* tpfx = "ConsiderCached ";
1002 
1003  TRACE(Debug, tpfx << curl);
1004 
1005  XrdCl::URL url(curl);
1006  std::string f_name = url.GetPath();
1007 
1008  File *file = nullptr;
1009  {
1010  XrdSysCondVarHelper lock(&m_active_cond);
1011  auto it = m_active.find(f_name);
1012  if (it != m_active.end()) {
1013  file = it->second;
1014  // If the file-open is in progress, `file` is a nullptr
1015  // so we cannot increase the reference count. For now,
1016  // simply treat it as if the file open doesn't exist instead
1017  // of trying to wait and see if it succeeds.
1018  if (file) {
1019  inc_ref_cnt(file, false, false);
1020  }
1021  }
1022  }
1023  if (file) {
1024  struct stat sbuff;
1025  int res = file->Fstat(sbuff);
1026  dec_ref_cnt(file, false);
1027  if (res)
1028  return res;
1029  // DecideIfConsideredCached() already called in File::Fstat().
1030  return sbuff.st_atime > 0 ? 0 : -EREMOTE;
1031  }
1032 
1033  struct stat sbuff;
1034  int res = m_oss->Stat(f_name.c_str(), &sbuff);
1035  if (res != XrdOssOK) {
1036  TRACE(Debug, tpfx << curl << " -> " << res);
1037  return res;
1038  }
1039  if (S_ISDIR(sbuff.st_mode))
1040  {
1041  TRACE(Debug, tpfx << curl << " -> EISDIR");
1042  return -EISDIR;
1043  }
1044 
1045  long long file_size = DetermineFullFileSize(f_name + Info::s_infoExtension);
1046  if (file_size < 0) {
1047  TRACE(Debug, tpfx << curl << " -> " << file_size);
1048  return (int) file_size;
1049  }
1050  bool is_cached = DecideIfConsideredCached(file_size, sbuff.st_blocks * 512ll);
1051 
1052  return is_cached ? 0 : -EREMOTE;
1053 }
1054 
1055 //______________________________________________________________________________
1063 //------------------------------------------------------------------------------
1064 
1065 int Cache::Prepare(const char *curl, int oflags, mode_t mode)
1066 {
1067  XrdCl::URL url(curl);
1068  std::string f_name = url.GetPath();
1069  std::string i_name = f_name + Info::s_infoExtension;
1070 
1071  // Do not allow write access.
1072  if (oflags & (O_WRONLY | O_RDWR | O_APPEND | O_CREAT))
1073  {
1074  TRACE(Warning, "Prepare write access requested on file " << f_name << ". Denying access.");
1075  return -EROFS;
1076  }
1077 
1078  // Intercept xrdpfc_command requests.
1079  if (m_configuration.m_allow_xrdpfc_command && strncmp("/xrdpfc_command/", f_name.c_str(), 16) == 0)
1080  {
1081  // Schedule a job to process command request.
1082  {
1083  CommandExecutor *ce = new CommandExecutor(f_name, "CommandExecutor");
1084 
1085  schedP->Schedule(ce);
1086  }
1087 
1088  return -EAGAIN;
1089  }
1090 
1091  {
1092  XrdSysCondVarHelper lock(&m_active_cond);
1093  m_purge_delay_set.insert(f_name);
1094  }
1095 
1096  struct stat sbuff;
1097  if (m_oss->Stat(i_name.c_str(), &sbuff) == XrdOssOK)
1098  {
1099  TRACE(Dump, "Prepare defer open " << f_name);
1100  return 1;
1101  }
1102  else
1103  {
1104  return 0;
1105  }
1106 }
1107 
1108 //______________________________________________________________________________
1109 // virtual method of XrdOucCache.
1114 //------------------------------------------------------------------------------
1115 
1116 int Cache::Stat(const char *curl, struct stat &sbuff)
1117 {
1118  const char *tpfx = "Stat ";
1119 
1120  XrdCl::URL url(curl);
1121  std::string f_name = url.GetPath();
1122 
1123  File *file = nullptr;
1124  {
1125  XrdSysCondVarHelper lock(&m_active_cond);
1126  auto it = m_active.find(f_name);
1127  if (it != m_active.end()) {
1128  file = it->second;
1129  // If `file` is nullptr, the file-open is in progress; instead
1130  // of waiting for the file-open to finish, simply treat it as if
1131  // the file-open doesn't exist.
1132  if (file) {
1133  inc_ref_cnt(file, false, false);
1134  }
1135  }
1136  }
1137  if (file) {
1138  int res = file->Fstat(sbuff);
1139  dec_ref_cnt(file, false);
1140  TRACE(Debug, tpfx << "from active file " << curl << " -> " << res);
1141  return res;
1142  }
1143 
1144  int res = m_oss->Stat(f_name.c_str(), &sbuff);
1145  if (res != XrdOssOK) {
1146  TRACE(Debug, tpfx << curl << " -> " << res);
1147  return 1; // res; -- for only-if-cached
1148  }
1149  if (S_ISDIR(sbuff.st_mode))
1150  {
1151  TRACE(Debug, tpfx << curl << " -> EISDIR");
1152  return -EISDIR;
1153  }
1154 
1155  long long file_size = DetermineFullFileSize(f_name + Info::s_infoExtension);
1156  if (file_size < 0) {
1157  TRACE(Debug, tpfx << curl << " -> " << file_size);
1158  return 1; // (int) file_size; -- for only-if-cached
1159  }
1160  sbuff.st_size = file_size;
1161  bool is_cached = DecideIfConsideredCached(file_size, sbuff.st_blocks * 512ll);
1162  if ( ! is_cached) {
1163  sbuff.st_ctime = sbuff.st_mtime = sbuff.st_atime = 0;
1164  }
1165 
1166  TRACE(Debug, tpfx << "from disk " << curl << " -> " << res);
1167 
1168  return 0;
1169 }
1170 
1171 //______________________________________________________________________________
1172 // virtual method of XrdOucCache.
1176 //------------------------------------------------------------------------------
1177 
1178 int Cache::Unlink(const char *curl)
1179 {
1180  XrdCl::URL url(curl);
1181  std::string f_name = url.GetPath();
1182 
1183  // printf("Unlink url=%s\n\t fname=%s\n", curl, f_name.c_str());
1184 
1185  return UnlinkFile(f_name, false);
1186 }
1187 
1188 int Cache::UnlinkFile(const std::string& f_name, bool fail_if_open)
1189 {
1190  static const char* trc_pfx = "UnlinkFile ";
1191  ActiveMap_i it;
1192  File *file = 0;
1193  long long st_blocks_to_purge = 0;
1194  {
1195  XrdSysCondVarHelper lock(&m_active_cond);
1196 
1197  it = m_active.find(f_name);
1198 
1199  if (it != m_active.end())
1200  {
1201  if (fail_if_open)
1202  {
1203  TRACE(Info, trc_pfx << f_name << ", file currently open and force not requested - denying request");
1204  return -EBUSY;
1205  }
1206 
1207  // Null File* in m_active map means an operation is ongoing, probably
1208  // Attach() with possible File::Open(). Ask for retry.
1209  if (it->second == 0)
1210  {
1211  TRACE(Info, trc_pfx << f_name << ", an operation on this file is ongoing - denying request");
1212  return -EAGAIN;
1213  }
1214 
1215  file = it->second;
1216  st_blocks_to_purge = file->initiate_emergency_shutdown();
1217  it->second = 0;
1218  }
1219  else
1220  {
1221  it = m_active.insert(std::make_pair(f_name, (File*) 0)).first;
1222  }
1223  }
1224 
1225  if (file) {
1226  RemoveWriteQEntriesFor(file);
1227  } else {
1228  struct stat f_stat;
1229  if (m_oss->Stat(f_name.c_str(), &f_stat) == XrdOssOK)
1230  st_blocks_to_purge = f_stat.st_blocks;
1231  }
1232 
1233  std::string i_name = f_name + Info::s_infoExtension;
1234 
1235  // Unlink file & cinfo
1236  int f_ret = m_oss->Unlink(f_name.c_str());
1237  int i_ret = m_oss->Unlink(i_name.c_str());
1238 
1239  if (st_blocks_to_purge)
1240  m_res_mon->register_file_purge(f_name, st_blocks_to_purge);
1241 
1242  TRACE(Debug, trc_pfx << f_name << ", f_ret=" << f_ret << ", i_ret=" << i_ret);
1243 
1244  {
1245  XrdSysCondVarHelper lock(&m_active_cond);
1246 
1247  m_active.erase(it);
1248  }
1249 
1250  return std::min(f_ret, i_ret);
1251 }
int DoIt(int argpnt, int argc, char **argv, bool singleshot)
Definition: XrdAccTest.cc:262
#define TRACE_Debug
Definition: XrdCmsTrace.hh:37
@ Warning
#define XrdOssOK
Definition: XrdOss.hh:50
std::string obfuscateAuth(const std::string &input)
#define TRACE_Dump
Definition: XrdPfcTrace.hh:11
#define TRACE_PC(act, pre_code, x)
Definition: XrdPfcTrace.hh:59
#define TRACE_INT(act, x)
Definition: XrdPfcTrace.hh:52
void * ResourceMonitorThread(void *)
Definition: XrdPfc.cc:54
XrdOucCache * XrdOucGetCache(XrdSysLogger *logger, const char *config_filename, const char *parameters, XrdOucEnv *env)
Definition: XrdPfc.cc:76
void * PrefetchThread(void *)
Definition: XrdPfc.cc:66
XrdSysXAttr * XrdSysXAttrActive
Definition: XrdSysFAttr.cc:61
void * ProcessWriteTaskThread(void *)
Definition: XrdPfc.cc:60
int stat(const char *path, struct stat *buf)
#define TRACE(act, x)
Definition: XrdTrace.hh:63
URL representation.
Definition: XrdClURL.hh:31
const std::string & GetPath() const
Get the path.
Definition: XrdClURL.hh:217
Definition: XrdJob.hh:43
virtual int Close(long long *retsz=0)=0
virtual int Open(const char *path, int Oflag, mode_t Mode, XrdOucEnv &env)
Definition: XrdOss.hh:200
virtual int Chmod(const char *path, mode_t mode, XrdOucEnv *envP=0)=0
virtual int Lfn2Pfn(const char *Path, char *buff, int blen)
Definition: XrdOss.hh:873
virtual XrdOssDF * newFile(const char *tident)=0
virtual int Stat(const char *path, struct stat *buff, int opts=0, XrdOucEnv *envP=0)=0
virtual int Unlink(const char *path, int Opts=0, XrdOucEnv *envP=0)=0
virtual const char * Path()=0
virtual int Fstat(struct stat &sbuff)
Definition: XrdOucCache.hh:148
virtual const char * Location(bool refresh=false)
Definition: XrdOucCache.hh:161
void * GetPtr(const char *varname)
Definition: XrdOucEnv.cc:281
void PutPtr(const char *varname, void *value)
Definition: XrdOucEnv.cc:316
int get_size() const
Definition: XrdPfcFile.hh:136
File * get_file() const
Definition: XrdPfcFile.hh:140
long long m_offset
Definition: XrdPfcFile.hh:114
Attaches/creates and detaches/deletes cache-io objects for disk based cache.
Definition: XrdPfc.hh:152
long long DetermineFullFileSize(const std::string &cinfo_fname)
Definition: XrdPfc.cc:925
void FileSyncDone(File *, bool high_debug)
Definition: XrdPfc.cc:542
File * GetFile(const std::string &, IO *, long long off=0, long long filesize=0)
Definition: XrdPfc.cc:389
static const Configuration & Conf()
Definition: XrdPfc.cc:134
bool Config(const char *config_filename, const char *parameters)
Parse configuration file.
virtual int LocalFilePath(const char *url, char *buff=0, int blen=0, LFP_Reason why=ForAccess, bool forall=false)
Definition: XrdPfc.cc:793
virtual int Stat(const char *url, struct stat &sbuff)
Definition: XrdPfc.cc:1116
const Configuration & RefConfiguration() const
Reference XrdPfc configuration.
Definition: XrdPfc.hh:204
static ResourceMonitor & ResMon()
Definition: XrdPfc.cc:135
bool IsFileActiveOrPurgeProtected(const std::string &) const
Definition: XrdPfc.cc:676
void ClearPurgeProtectedSet()
Definition: XrdPfc.cc:684
void ReleaseRAM(char *buf, long long size)
Definition: XrdPfc.cc:371
virtual int ConsiderCached(const char *url)
Definition: XrdPfc.cc:999
static Cache & GetInstance()
Singleton access.
Definition: XrdPfc.cc:132
void DeRegisterPrefetchFile(File *)
Definition: XrdPfc.cc:710
void ExecuteCommandUrl(const std::string &command_url)
void RegisterPrefetchFile(File *)
Definition: XrdPfc.cc:694
void WriteFileSizeXAttr(int cinfo_fd, long long file_size)
Definition: XrdPfc.cc:910
void Prefetch()
Definition: XrdPfc.cc:751
void ReleaseFile(File *, IO *)
Definition: XrdPfc.cc:471
void AddWriteTask(Block *b, bool from_read)
Add downloaded block in write queue.
Definition: XrdPfc.cc:221
Cache(XrdSysLogger *logger, XrdOucEnv *env)
Constructor.
Definition: XrdPfc.cc:158
bool Decide(XrdOucCacheIO *)
Makes decision if the original XrdOucCacheIO should be cached.
Definition: XrdPfc.cc:137
int UnlinkFile(const std::string &f_name, bool fail_if_open)
Remove cinfo and data files from cache.
Definition: XrdPfc.cc:1188
virtual XrdOucCacheIO * Attach(XrdOucCacheIO *ioP, int opts=0)=0
Obtain a new IO object that fronts existing XrdOucCacheIO.
static XrdScheduler * schedP
Definition: XrdPfc.hh:290
File * GetNextFileToPrefetch()
Definition: XrdPfc.cc:732
ResourceMonitor & RefResMon()
Definition: XrdPfc.hh:285
long long WritesSinceLastCall()
Definition: XrdPfc.cc:320
void ProcessWriteTasks()
Separate task which writes blocks from ram to disk.
Definition: XrdPfc.cc:273
virtual int Unlink(const char *url)
Definition: XrdPfc.cc:1178
void RemoveWriteQEntriesFor(File *f)
Remove blocks from write queue which belong to given prefetch. This method is used at the time of Fil...
Definition: XrdPfc.cc:240
static const Cache & TheOne()
Definition: XrdPfc.cc:133
char * RequestRAM(long long size)
Definition: XrdPfc.cc:331
virtual int Prepare(const char *url, int oflags, mode_t mode)
Definition: XrdPfc.cc:1065
bool DecideIfConsideredCached(long long file_size, long long bytes_on_disk)
Definition: XrdPfc.cc:966
static Cache & CreateInstance(XrdSysLogger *logger, XrdOucEnv *env)
Singleton creation.
Definition: XrdPfc.cc:125
Base class for selecting which files should be cached.
virtual bool Decide(const std::string &, XrdOss &) const =0
bool FinalizeSyncBeforeExit()
Returns true if any of blocks need sync. Called from Cache::dec_ref_cnt on zero ref cnt.
Definition: XrdPfcFile.cc:322
const char * lPath() const
Log path.
Definition: XrdPfcFile.cc:1534
void WriteBlockToDisk(Block *b)
Definition: XrdPfcFile.cc:1068
static File * FileOpen(const std::string &path, long long offset, long long fileSize)
Static constructor that also does Open. Returns null ptr if Open fails.
Definition: XrdPfcFile.cc:138
int GetNBlocks() const
Definition: XrdPfcFile.hh:278
void Prefetch()
Definition: XrdPfcFile.cc:1549
std::string GetRemoteLocations() const
Definition: XrdPfcFile.cc:1646
const Info::AStat * GetLastAccessStats() const
Definition: XrdPfcFile.hh:275
size_t GetAccessCnt() const
Definition: XrdPfcFile.hh:276
int Fstat(struct stat &sbuff)
Definition: XrdPfcFile.cc:563
void AddIO(IO *io)
Definition: XrdPfcFile.cc:346
long long GetPrefetchedBytes() const
Definition: XrdPfcFile.hh:280
int GetBlockSize() const
Definition: XrdPfcFile.hh:277
int GetNDownloadedBlocks() const
Definition: XrdPfcFile.hh:279
void BlocksRemovedFromWriteQ(std::list< Block * > &)
Handle removal of a set of blocks from Cache's write queue.
Definition: XrdPfcFile.cc:216
int inc_ref_cnt()
Definition: XrdPfcFile.hh:287
void Sync()
Sync file cache inf o and output data with disk.
Definition: XrdPfcFile.cc:1148
int dec_ref_cnt()
Definition: XrdPfcFile.hh:288
int get_ref_cnt()
Definition: XrdPfcFile.hh:286
long long initiate_emergency_shutdown()
Definition: XrdPfcFile.cc:151
long long GetFileSize() const
Definition: XrdPfcFile.hh:267
const Stats & RefStats() const
Definition: XrdPfcFile.hh:281
void RemoveIO(IO *io)
Definition: XrdPfcFile.cc:383
const std::string & GetLocalPath() const
Definition: XrdPfcFile.hh:262
bool is_in_emergency_shutdown()
Definition: XrdPfcFile.hh:291
Downloads original file into multiple files, chunked into blocks. Only blocks that are asked for are ...
Downloads original file into a single file on local disk. Handles read requests as they come along.
Definition: XrdPfcIOFile.hh:39
bool HasFile() const
Check if File was opened successfully.
Definition: XrdPfcIOFile.hh:48
Base cache-io class that implements some XrdOucCacheIO abstract methods.
Definition: XrdPfcIO.hh:16
Status of cached file. Can be read from and written into a binary file.
Definition: XrdPfcInfo.hh:41
static const char * s_infoExtension
Definition: XrdPfcInfo.hh:309
void WriteIOStatSingle(long long bytes_disk)
Write single open/close time for given bytes read from disk.
Definition: XrdPfcInfo.cc:444
bool Write(XrdOssDF *fp, const char *dname, const char *fname=0)
Definition: XrdPfcInfo.cc:266
bool IsComplete() const
Get complete status.
Definition: XrdPfcInfo.hh:447
long long GetFileSize() const
Get file size.
Definition: XrdPfcInfo.hh:442
bool Read(XrdOssDF *fp, const char *dname, const char *fname=0)
Read content of cinfo file into this object.
Definition: XrdPfcInfo.cc:294
void register_file_purge(DirState *target, long long size_in_st_blocks)
Statistics of cache utilisation by a File object.
Definition: XrdPfcStats.hh:35
int m_NCksumErrors
number of checksum errors while getting data from remote
Definition: XrdPfcStats.hh:44
long long m_BytesWritten
number of bytes written to disk
Definition: XrdPfcStats.hh:42
void Schedule(XrdJob *jp)
void Say(const char *text1, const char *text2=0, const char *txt3=0, const char *text4=0, const char *text5=0, const char *txt6=0)
Definition: XrdSysError.cc:141
static int Run(pthread_t *, void *(*proc)(void *), void *arg, int opts=0, const char *desc=0)
static void Wait(int milliseconds)
Definition: XrdSysTimer.cc:227
virtual int Get(const char *Aname, void *Aval, int Avsz, const char *Path, int fd=-1)=0
virtual int Set(const char *Aname, const void *Aval, int Avsz, const char *Path, int fd=-1, int isNew=0)=0
bool Insert(const char *data, int dlen)
Definition: XrdPfc.hh:41
Contains parameters configurable from the xrootd config file.
Definition: XrdPfc.hh:64
long long m_RamAbsAvailable
available from configuration
Definition: XrdPfc.hh:109
bool m_allow_xrdpfc_command
flag for enabling access to /xrdpfc-command/ functionality.
Definition: XrdPfc.hh:85
int m_prefetch_max_blocks
maximum number of blocks to prefetch per file
Definition: XrdPfc.hh:113
int m_RamKeepStdBlocks
number of standard-sized blocks kept after release
Definition: XrdPfc.hh:110
long long m_bufferSize
prefetch buffer size, default 1MB
Definition: XrdPfc.hh:108
int m_wqueue_blocks
maximum number of blocks written per write-queue loop
Definition: XrdPfc.hh:111
std::string m_username
username passed to oss plugin
Definition: XrdPfc.hh:87
double m_onlyIfCachedMinFrac
minimum fraction of downloaded file, used by only-if-cached CGI option
Definition: XrdPfc.hh:123
long long m_onlyIfCachedMinSize
minumum size of downloaded file, used by only-if-cached CGI option
Definition: XrdPfc.hh:122
Access statistics.
Definition: XrdPfcInfo.hh:57
long long BytesHit
read from cache
Definition: XrdPfcInfo.hh:64
long long BytesBypassed
read from remote and dropped
Definition: XrdPfcInfo.hh:66
time_t DetachTime
close time
Definition: XrdPfcInfo.hh:59
long long BytesMissed
read from remote and cached
Definition: XrdPfcInfo.hh:65
time_t AttachTime
open time
Definition: XrdPfcInfo.hh:58