XRootD
XrdPfcFile.cc
Go to the documentation of this file.
1 //----------------------------------------------------------------------------------
2 // Copyright (c) 2014 by Board of Trustees of the Leland Stanford, Jr., University
3 // Author: Alja Mrak-Tadel, Matevz Tadel
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 
20 #include "XrdPfcFile.hh"
21 #include "XrdPfc.hh"
22 #include "XrdPfcResourceMonitor.hh"
23 #include "XrdPfcIO.hh"
24 #include "XrdPfcTrace.hh"
25 
26 #include "XProtocol/XProtocol.hh"
27 #include "XrdSys/XrdSysTimer.hh"
28 #include "XrdOss/XrdOss.hh"
29 #include "XrdOuc/XrdOucEnv.hh"
31 
32 #include <cstdio>
33 #include <sstream>
34 #include <fcntl.h>
35 #include <cassert>
36 
37 
38 using namespace XrdPfc;
39 
40 namespace
41 {
42 
43 const int BLOCK_WRITE_MAX_ATTEMPTS = 4;
44 
45 Cache* cache() { return &Cache::GetInstance(); }
46 
47 }
48 
49 const char *File::m_traceID = "File";
50 
51 //------------------------------------------------------------------------------
52 
53 File::File(const std::string& path, long long iOffset, long long iFileSize) :
54  m_ref_cnt(0),
55  m_data_file(0),
56  m_info_file(0),
57  m_cfi(Cache::GetInstance().GetTrace(), Cache::GetInstance().RefConfiguration().m_prefetch_max_blocks > 0),
58  m_filename(path),
59  m_offset(iOffset),
60  m_file_size(iFileSize),
61  m_current_io(m_io_set.end()),
62  m_ios_in_detach(0),
63  m_non_flushed_cnt(0),
64  m_in_sync(false),
65  m_detach_time_logged(false),
66  m_in_shutdown(false),
67  m_state_cond(0),
68  m_block_size(0),
69  m_num_blocks(0),
70  m_resmon_token(-1),
71  m_prefetch_state(kOff),
72  m_prefetch_bytes(0),
73  m_prefetch_read_cnt(0),
74  m_prefetch_hit_cnt(0),
75  m_prefetch_score(0)
76 {}
77 
78 File::~File()
79 {
80  TRACEF(Debug, "~File() for ");
81 }
82 
83 void File::Close()
84 {
85  // Close is called while nullptr is put into Cache::m_active map, see Cache::dec_ref_count(File*).
86  // A stat is called after close to re-check that m_stat_blocks have been reported correctly
87  // to the resource-monitor. Note that the reporting is already clamped down to m_file_size
88  // in report_and_merge_delta_stats() below.
89  //
90  // XFS can pre-allocate significant amount of blocks (1 GB at 1GB mark, 4 GB above 4GB) and those
91  // get reported in as stat.st_blocks.
92  // The reported number is correct in a stat immediately following a close.
93  // If one starts off by writing the last byte of the file, this pre-allocation does not get
94  // triggered up to that point. But comes back with a vengeance right after.
95  //
96  // To be determined if other FSes do something similar (Ceph, ZFS, ...). Ext4 doesn't.
97 
98  if (m_info_file)
99  {
100  TRACEF(Debug, "Close() closing info-file ");
101  m_info_file->Close();
102  delete m_info_file;
103  m_info_file = nullptr;
104  }
105 
106  if (m_data_file)
107  {
108  TRACEF(Debug, "Close() closing data-file ");
109  m_data_file->Close();
110  delete m_data_file;
111  m_data_file = nullptr;
112  }
113 
114  if (m_resmon_token >= 0)
115  {
116  // Last update of file stats has been sent from the final Sync unless we are in_shutdown --
117  // but in this case the file will get unlinked by the cache and reported as purge event.
118  // We check if the reported st_blocks so far is correct.
119  if (m_stats.m_BytesWritten > 0 && ! m_in_shutdown) {
120  struct stat s;
121  int sr = Cache::GetInstance().GetOss()->Stat(m_filename.c_str(), &s);
122  if (sr == 0 && s.st_blocks != m_st_blocks) {
123  Stats stats;
124  stats.m_StBlocksAdded = s.st_blocks - m_st_blocks;
125  m_st_blocks = s.st_blocks;
126  Cache::ResMon().register_file_update_stats(m_resmon_token, stats);
127  }
128  }
129 
130  Cache::ResMon().register_file_close(m_resmon_token, time(0), m_stats);
131  }
132 
133  TRACEF(Debug, "Close() finished, prefetch score = " << m_prefetch_score);
134 }
135 
136 //------------------------------------------------------------------------------
137 
138 File* File::FileOpen(const std::string &path, long long offset, long long fileSize)
139 {
140  File *file = new File(path, offset, fileSize);
141  if ( ! file->Open())
142  {
143  delete file;
144  file = 0;
145  }
146  return file;
147 }
148 
149 //------------------------------------------------------------------------------
150 
152 {
153  // Called from Cache::Unlink() when the file is currently open.
154  // Cache::Unlink is also called on FSync error and when wrong number of bytes
155  // is received from a remote read.
156  //
157  // From this point onward the file will not be written to, cinfo file will
158  // not be updated, and all new read requests will return -ENOENT.
159  //
160  // File's entry in the Cache's active map is set to nullptr and will be
161  // removed from there shortly, in any case, well before this File object
162  // shuts down. Cache::Unlink() also reports the appropriate purge event.
163 
164  XrdSysCondVarHelper _lck(m_state_cond);
165 
166  m_in_shutdown = true;
167 
168  if (m_prefetch_state != kStopped && m_prefetch_state != kComplete)
169  {
170  m_prefetch_state = kStopped;
171  cache()->DeRegisterPrefetchFile(this);
172  }
173 
174  report_and_merge_delta_stats();
175 
176  return m_st_blocks;
177 }
178 
179 //------------------------------------------------------------------------------
180 
181 void File::check_delta_stats()
182 {
183  // Called under m_state_cond lock.
184  // BytesWritten indirectly trigger an unconditional merge through periodic Sync().
185  if (m_delta_stats.BytesReadAndWritten() >= m_resmon_report_threshold && ! m_in_shutdown)
186  report_and_merge_delta_stats();
187 }
188 
189 void File::report_and_merge_delta_stats()
190 {
191  // Called under m_state_cond lock.
192  struct stat s;
193  m_data_file->Fstat(&s);
194  // Do not report st_blocks beyond 4kB round-up over m_file_size. Some FSs report
195  // aggressive pre-allocation in this field (XFS, 4GB).
196  long long max_st_blocks_to_report = (m_file_size & 0xfff) ? ((m_file_size >> 12) + 1) << 3
197  : m_file_size >> 9;
198  long long st_blocks_to_report = std::min((long long) s.st_blocks, max_st_blocks_to_report);
199  m_delta_stats.m_StBlocksAdded = st_blocks_to_report - m_st_blocks;
200  m_st_blocks = st_blocks_to_report;
201  Cache::ResMon().register_file_update_stats(m_resmon_token, m_delta_stats);
202  m_stats.AddUp(m_delta_stats);
203  m_delta_stats.Reset();
204 }
205 
206 //------------------------------------------------------------------------------
207 
209 {
210  TRACEF(Dump, "BlockRemovedFromWriteQ() block = " << (void*) b << " idx= " << b->m_offset/m_block_size);
211 
212  XrdSysCondVarHelper _lck(m_state_cond);
213  dec_ref_count(b);
214 }
215 
216 void File::BlocksRemovedFromWriteQ(std::list<Block*>& blocks)
217 {
218  TRACEF(Dump, "BlocksRemovedFromWriteQ() n_blocks = " << blocks.size());
219 
220  XrdSysCondVarHelper _lck(m_state_cond);
221 
222  for (std::list<Block*>::iterator i = blocks.begin(); i != blocks.end(); ++i)
223  {
224  dec_ref_count(*i);
225  }
226 }
227 
228 //------------------------------------------------------------------------------
229 
231 {
232  std::string loc(io->GetLocation());
233  XrdSysCondVarHelper _lck(m_state_cond);
234  insert_remote_location(loc);
235 }
236 
237 //------------------------------------------------------------------------------
238 
240 {
241  // Returns true if delay is needed.
242 
243  TRACEF(Debug, "ioActive start for io " << io);
244 
245  std::string loc(io->GetLocation());
246 
247  {
248  XrdSysCondVarHelper _lck(m_state_cond);
249 
250  IoSet_i mi = m_io_set.find(io);
251 
252  if (mi != m_io_set.end())
253  {
254  unsigned int n_active_reads = io->m_active_read_reqs;
255 
256  TRACE(Info, "ioActive for io " << io <<
257  ", active_reads " << n_active_reads <<
258  ", active_prefetches " << io->m_active_prefetches <<
259  ", allow_prefetching " << io->m_allow_prefetching <<
260  ", ios_in_detach " << m_ios_in_detach);
261  TRACEF(Info,
262  "\tio_map.size() " << m_io_set.size() <<
263  ", block_map.size() " << m_block_map.size() << ", file");
264 
265  insert_remote_location(loc);
266 
267  io->m_allow_prefetching = false;
268  io->m_in_detach = true;
269 
270  // Check if any IO is still available for prfetching. If not, stop it.
271  if (m_prefetch_state == kOn || m_prefetch_state == kHold)
272  {
273  if ( ! select_current_io_or_disable_prefetching(false) )
274  {
275  TRACEF(Debug, "ioActive stopping prefetching after io " << io << " retreat.");
276  }
277  }
278 
279  // On last IO, consider write queue blocks. Note, this also contains
280  // blocks being prefetched.
281 
282  bool io_active_result;
283 
284  if (n_active_reads > 0)
285  {
286  io_active_result = true;
287  }
288  else if (m_io_set.size() - m_ios_in_detach == 1)
289  {
290  io_active_result = ! m_block_map.empty();
291  }
292  else
293  {
294  io_active_result = io->m_active_prefetches > 0;
295  }
296 
297  if ( ! io_active_result)
298  {
299  ++m_ios_in_detach;
300  }
301 
302  TRACEF(Info, "ioActive for io " << io << " returning " << io_active_result << ", file");
303 
304  return io_active_result;
305  }
306  else
307  {
308  TRACEF(Error, "ioActive io " << io <<" not found in IoSet. This should not happen.");
309  return false;
310  }
311  }
312 }
313 
314 //------------------------------------------------------------------------------
315 
317 {
318  XrdSysCondVarHelper _lck(m_state_cond);
319  m_detach_time_logged = false;
320 }
321 
323 {
324  // Returns true if sync is required.
325  // This method is called after corresponding IO is detached from PosixCache.
326 
327  XrdSysCondVarHelper _lck(m_state_cond);
328  if ( ! m_in_shutdown)
329  {
330  if ( ! m_writes_during_sync.empty() || m_non_flushed_cnt > 0 || ! m_detach_time_logged)
331  {
332  report_and_merge_delta_stats();
333  m_cfi.WriteIOStatDetach(m_stats);
334  m_detach_time_logged = true;
335  m_in_sync = true;
336  TRACEF(Debug, "FinalizeSyncBeforeExit requesting sync to write detach stats");
337  return true;
338  }
339  }
340  TRACEF(Debug, "FinalizeSyncBeforeExit sync not required");
341  return false;
342 }
343 
344 //------------------------------------------------------------------------------
345 
346 void File::AddIO(IO *io)
347 {
348  // Called from Cache::GetFile() when a new IO asks for the file.
349 
350  TRACEF(Debug, "AddIO() io = " << (void*)io);
351 
352  time_t now = time(0);
353  std::string loc(io->GetLocation());
354 
355  m_state_cond.Lock();
356 
357  IoSet_i mi = m_io_set.find(io);
358 
359  if (mi == m_io_set.end())
360  {
361  m_io_set.insert(io);
362  io->m_attach_time = now;
363  m_delta_stats.IoAttach();
364 
365  insert_remote_location(loc);
366 
367  if (m_prefetch_state == kStopped)
368  {
369  m_prefetch_state = kOn;
370  cache()->RegisterPrefetchFile(this);
371  }
372  }
373  else
374  {
375  TRACEF(Error, "AddIO() io = " << (void*)io << " already registered.");
376  }
377 
378  m_state_cond.UnLock();
379 }
380 
381 //------------------------------------------------------------------------------
382 
384 {
385  // Called from Cache::ReleaseFile.
386 
387  TRACEF(Debug, "RemoveIO() io = " << (void*)io);
388 
389  time_t now = time(0);
390 
391  m_state_cond.Lock();
392 
393  IoSet_i mi = m_io_set.find(io);
394 
395  if (mi != m_io_set.end())
396  {
397  if (mi == m_current_io)
398  {
399  ++m_current_io;
400  }
401 
402  m_delta_stats.IoDetach(now - io->m_attach_time);
403  m_io_set.erase(mi);
404  --m_ios_in_detach;
405 
406  if (m_io_set.empty() && m_prefetch_state != kStopped && m_prefetch_state != kComplete)
407  {
408  TRACEF(Error, "RemoveIO() io = " << (void*)io << " Prefetching is not stopped/complete -- it should be by now.");
409  m_prefetch_state = kStopped;
410  cache()->DeRegisterPrefetchFile(this);
411  }
412  }
413  else
414  {
415  TRACEF(Error, "RemoveIO() io = " << (void*)io << " is NOT registered.");
416  }
417 
418  m_state_cond.UnLock();
419 }
420 
421 //------------------------------------------------------------------------------
422 
423 bool File::Open()
424 {
425  // Sets errno accordingly.
426 
427  static const char *tpfx = "Open() ";
428 
429  TRACEF(Dump, tpfx << "entered");
430 
431  // Before touching anything, check with ResourceMonitor if a scan is in progress.
432  // This function will wait internally if needed until it is safe to proceed.
433  Cache::ResMon().CrossCheckIfScanIsInProgress(m_filename, m_state_cond);
434 
436 
437  XrdOss &myOss = * Cache::GetInstance().GetOss();
438  const char *myUser = conf.m_username.c_str();
439  XrdOucEnv myEnv;
440  struct stat data_stat, info_stat;
441 
442  std::string ifn = m_filename + Info::s_infoExtension;
443 
444  bool data_existed = (myOss.Stat(m_filename.c_str(), &data_stat) == XrdOssOK);
445  bool info_existed = (myOss.Stat(ifn.c_str(), &info_stat) == XrdOssOK);
446 
447  // Create the data file itself.
448  char size_str[32]; sprintf(size_str, "%lld", m_file_size);
449  myEnv.Put("oss.asize", size_str);
450  myEnv.Put("oss.cgroup", conf.m_data_space.c_str());
451 
452  int res;
453 
454  if ((res = myOss.Create(myUser, m_filename.c_str(), 0600, myEnv, XRDOSS_mkpath)) != XrdOssOK)
455  {
456  TRACEF(Error, tpfx << "Create failed " << ERRNO_AND_ERRSTR(-res));
457  errno = -res;
458  return false;
459  }
460 
461  m_data_file = myOss.newFile(myUser);
462  if ((res = m_data_file->Open(m_filename.c_str(), O_RDWR, 0600, myEnv)) != XrdOssOK)
463  {
464  TRACEF(Error, tpfx << "Open failed " << ERRNO_AND_ERRSTR(-res));
465  errno = -res;
466  delete m_data_file; m_data_file = 0;
467  return false;
468  }
469 
470  myEnv.Put("oss.asize", "64k"); // Advisory, block-map and access list lengths vary.
471  myEnv.Put("oss.cgroup", conf.m_meta_space.c_str());
472  if ((res = myOss.Create(myUser, ifn.c_str(), 0600, myEnv, XRDOSS_mkpath)) != XrdOssOK)
473  {
474  TRACE(Error, tpfx << "Create failed for info file " << ifn << ERRNO_AND_ERRSTR(-res));
475  errno = -res;
476  m_data_file->Close(); delete m_data_file; m_data_file = 0;
477  return false;
478  }
479 
480  m_info_file = myOss.newFile(myUser);
481  if ((res = m_info_file->Open(ifn.c_str(), O_RDWR, 0600, myEnv)) != XrdOssOK)
482  {
483  TRACEF(Error, tpfx << "Failed for info file " << ifn << ERRNO_AND_ERRSTR(-res));
484  errno = -res;
485  delete m_info_file; m_info_file = 0;
486  m_data_file->Close(); delete m_data_file; m_data_file = 0;
487  return false;
488  }
489 
490  bool initialize_info_file = true;
491 
492  if (info_existed && m_cfi.Read(m_info_file, ifn.c_str()))
493  {
494  TRACEF(Debug, tpfx << "Reading existing info file. (data_existed=" << data_existed <<
495  ", data_size_stat=" << (data_existed ? data_stat.st_size : -1ll) <<
496  ", data_size_from_last_block=" << m_cfi.GetExpectedDataFileSize() << ")");
497 
498  // Check if data file exists and is of reasonable size.
499  if (data_existed && data_stat.st_size >= m_cfi.GetExpectedDataFileSize())
500  {
501  initialize_info_file = false;
502  } else {
503  TRACEF(Warning, tpfx << "Basic sanity checks on data file failed, resetting info file, truncating data file.");
504  m_cfi.ResetAllAccessStats();
505  m_data_file->Ftruncate(0);
506  Cache::ResMon().register_file_purge(m_filename, data_stat.st_blocks);
507  }
508  }
509 
510  if ( ! initialize_info_file && m_cfi.GetCkSumState() != conf.get_cs_Chk())
511  {
512  if (conf.does_cschk_have_missing_bits(m_cfi.GetCkSumState()) &&
513  conf.should_uvkeep_purge(time(0) - m_cfi.GetNoCkSumTimeForUVKeep()))
514  {
515  TRACEF(Info, tpfx << "Cksum state of file insufficient, uvkeep test failed, resetting info file, truncating data file.");
516  initialize_info_file = true;
517  m_cfi.ResetAllAccessStats();
518  m_data_file->Ftruncate(0);
519  Cache::ResMon().register_file_purge(m_filename, data_stat.st_blocks);
520  } else {
521  // TODO: If the file is complete, we don't need to reset net cksums.
522  m_cfi.DowngradeCkSumState(conf.get_cs_Chk());
523  }
524  }
525 
526  if (initialize_info_file)
527  {
528  m_cfi.SetBufferSizeFileSizeAndCreationTime(conf.m_bufferSize, m_file_size);
529  m_cfi.SetCkSumState(conf.get_cs_Chk());
530  m_cfi.ResetNoCkSumTime();
531  m_cfi.Write(m_info_file, ifn.c_str());
532  m_info_file->Fsync();
533  cache()->WriteFileSizeXAttr(m_info_file->getFD(), m_file_size);
534  TRACEF(Debug, tpfx << "Creating new file info, data size = " << m_file_size << " num blocks = " << m_cfi.GetNBlocks());
535  }
536  else
537  {
538  if (futimens(m_info_file->getFD(), NULL)) {
539  TRACEF(Error, tpfx << "failed setting modification time " << ERRNO_AND_ERRSTR(errno));
540  }
541  }
542 
543  m_cfi.WriteIOStatAttach();
544  m_state_cond.Lock();
545  m_block_size = m_cfi.GetBufferSize();
546  m_num_blocks = m_cfi.GetNBlocks();
547  m_prefetch_state = (m_cfi.IsComplete()) ? kComplete : kStopped; // Will engage in AddIO().
548 
549  m_data_file->Fstat(&data_stat);
550  m_st_blocks = data_stat.st_blocks;
551 
552  m_resmon_token = Cache::ResMon().register_file_open(m_filename, time(0), data_existed);
553  constexpr long long MB = 1024 * 1024;
554  m_resmon_report_threshold = std::min(std::max(10 * MB, m_file_size / 20), 500 * MB);
555  // m_resmon_report_threshold_scaler; // something like 10% of original threshold, to adjust
556  // actual threshold based on return values from register_file_update_stats().
557 
558  m_state_cond.UnLock();
559 
560  return true;
561 }
562 
563 int File::Fstat(struct stat &sbuff)
564 {
565  // Stat on an open file.
566  // Corrects size to actual full size of the file.
567  // Sets atime to 0 if the file is only partially downloaded, in accordance
568  // with pfc.onlyifcached settings.
569  // Called from IO::Fstat() and Cache::Stat() when the file is active.
570  // Returns 0 on success, -errno on error.
571 
572  int res;
573 
574  if ((res = m_data_file->Fstat(&sbuff))) return res;
575 
576  sbuff.st_size = m_file_size;
577 
578  bool is_cached = cache()->DecideIfConsideredCached(m_file_size, sbuff.st_blocks * 512ll);
579  if ( ! is_cached)
580  sbuff.st_atime = 0;
581 
582  return 0;
583 }
584 
585 //==============================================================================
586 // Read and helpers
587 //==============================================================================
588 
589 bool File::overlap(int blk, // block to query
590  long long blk_size, //
591  long long req_off, // offset of user request
592  int req_size, // size of user request
593  // output:
594  long long &off, // offset in user buffer
595  long long &blk_off, // offset in block
596  int &size) // size to copy
597 {
598  const long long beg = blk * blk_size;
599  const long long end = beg + blk_size;
600  const long long req_end = req_off + req_size;
601 
602  if (req_off < end && req_end > beg)
603  {
604  const long long ovlp_beg = std::max(beg, req_off);
605  const long long ovlp_end = std::min(end, req_end);
606 
607  off = ovlp_beg - req_off;
608  blk_off = ovlp_beg - beg;
609  size = (int) (ovlp_end - ovlp_beg);
610 
611  assert(size <= blk_size);
612  return true;
613  }
614  else
615  {
616  return false;
617  }
618 }
619 
620 //------------------------------------------------------------------------------
621 
622 Block* File::PrepareBlockRequest(int i, IO *io, void *req_id, bool prefetch)
623 {
624  // Must be called w/ state_cond locked.
625  // Checks on size etc should be done before.
626  //
627  // Reference count is 0 so increase it in calling function if you want to
628  // catch the block while still in memory.
629 
630  const long long off = i * m_block_size;
631  const int last_block = m_num_blocks - 1;
632  const bool cs_net = cache()->RefConfiguration().is_cschk_net();
633 
634  int blk_size, req_size;
635  if (i == last_block) {
636  blk_size = req_size = m_file_size - off;
637  if (cs_net && req_size & 0xFFF) req_size = (req_size & ~0xFFF) + 0x1000;
638  } else {
639  blk_size = req_size = m_block_size;
640  }
641 
642  Block *b = 0;
643  char *buf = cache()->RequestRAM(req_size);
644 
645  if (buf)
646  {
647  b = new (std::nothrow) Block(this, io, req_id, buf, off, blk_size, req_size, prefetch, cs_net);
648 
649  if (b)
650  {
651  m_block_map[i] = b;
652 
653  // Actual Read request is issued in ProcessBlockRequests().
654 
655  if (m_prefetch_state == kOn && (int) m_block_map.size() >= Cache::GetInstance().RefConfiguration().m_prefetch_max_blocks)
656  {
657  m_prefetch_state = kHold;
658  cache()->DeRegisterPrefetchFile(this);
659  }
660  }
661  else
662  {
663  TRACEF(Dump, "PrepareBlockRequest() " << i << " prefetch " << prefetch << ", allocation failed.");
664  }
665  }
666 
667  return b;
668 }
669 
670 void File::ProcessBlockRequest(Block *b)
671 {
672  // This *must not* be called with block_map locked.
673 
675 
676  if (XRD_TRACE What >= TRACE_Dump) {
677  char buf[256];
678  snprintf(buf, 256, "idx=%lld, block=%p, prefetch=%d, off=%lld, req_size=%d, buff=%p, resp_handler=%p ",
679  b->get_offset()/m_block_size, b, b->m_prefetch, b->get_offset(), b->get_req_size(), b->get_buff(), brh);
680  TRACEF(Dump, "ProcessBlockRequest() " << buf);
681  }
682 
683  if (b->req_cksum_net())
684  {
685  b->get_io()->GetInput()->pgRead(*brh, b->get_buff(), b->get_offset(), b->get_req_size(),
686  b->ref_cksum_vec(), 0, b->ptr_n_cksum_errors());
687  } else {
688  b->get_io()->GetInput()-> Read(*brh, b->get_buff(), b->get_offset(), b->get_size());
689  }
690 }
691 
692 void File::ProcessBlockRequests(BlockList_t& blks)
693 {
694  // This *must not* be called with block_map locked.
695 
696  for (BlockList_i bi = blks.begin(); bi != blks.end(); ++bi)
697  {
698  ProcessBlockRequest(*bi);
699  }
700 }
701 
702 //------------------------------------------------------------------------------
703 
704 void File::RequestBlocksDirect(IO *io, ReadRequest *read_req, std::vector<XrdOucIOVec>& ioVec, int expected_size)
705 {
706  int n_chunks = ioVec.size();
707  int n_vec_reads = (n_chunks - 1) / XrdProto::maxRvecsz + 1;
708 
709  TRACEF(DumpXL, "RequestBlocksDirect() issuing ReadV for n_chunks = " << n_chunks <<
710  ", total_size = " << expected_size << ", n_vec_reads = " << n_vec_reads);
711 
712  DirectResponseHandler *handler = new DirectResponseHandler(this, read_req, n_vec_reads);
713 
714  int pos = 0;
715  while (n_chunks > XrdProto::maxRvecsz) {
716  io->GetInput()->ReadV( *handler, ioVec.data() + pos, XrdProto::maxRvecsz);
717  pos += XrdProto::maxRvecsz;
718  n_chunks -= XrdProto::maxRvecsz;
719  }
720  io->GetInput()->ReadV( *handler, ioVec.data() + pos, n_chunks);
721 }
722 
723 //------------------------------------------------------------------------------
724 
725 int File::ReadBlocksFromDisk(std::vector<XrdOucIOVec>& ioVec, int expected_size)
726 {
727  TRACEF(DumpXL, "ReadBlocksFromDisk() issuing ReadV for n_chunks = " << (int) ioVec.size() << ", total_size = " << expected_size);
728 
729  long long rs = m_data_file->ReadV(ioVec.data(), (int) ioVec.size());
730 
731  if (rs < 0)
732  {
733  TRACEF(Error, "ReadBlocksFromDisk neg retval = " << rs);
734  return rs;
735  }
736 
737  if (rs != expected_size)
738  {
739  TRACEF(Error, "ReadBlocksFromDisk incomplete size = " << rs);
740  return -EIO;
741  }
742 
743  return (int) rs;
744 }
745 
746 //------------------------------------------------------------------------------
747 
748 int File::Read(IO *io, char* iUserBuff, long long iUserOff, int iUserSize, ReadReqRH *rh)
749 {
750  // rrc_func is ONLY called from async processing.
751  // If this function returns anything other than -EWOULDBLOCK, rrc_func needs to be called by the caller.
752  // This streamlines implementation of synchronous IO::Read().
753 
754  TRACEF(Dump, "Read() sid: " << Xrd::hex1 << rh->m_seq_id << " size: " << iUserSize);
755 
756  m_state_cond.Lock();
757 
758  if (m_in_shutdown || io->m_in_detach)
759  {
760  m_state_cond.UnLock();
761  return m_in_shutdown ? -ENOENT : -EBADF;
762  }
763 
764  // Shortcut -- file is fully downloaded.
765 
766  if (m_cfi.IsComplete())
767  {
768  m_state_cond.UnLock();
769  int ret = m_data_file->Read(iUserBuff, iUserOff, iUserSize);
770  if (ret > 0) {
771  XrdSysCondVarHelper _lck(m_state_cond);
772  m_delta_stats.AddBytesHit(ret);
773  check_delta_stats();
774  }
775  return ret;
776  }
777 
778  XrdOucIOVec readV( { iUserOff, iUserSize, 0, iUserBuff } );
779 
780  return ReadOpusCoalescere(io, &readV, 1, rh, "Read() ");
781 }
782 
783 //------------------------------------------------------------------------------
784 
785 int File::ReadV(IO *io, const XrdOucIOVec *readV, int readVnum, ReadReqRH *rh)
786 {
787  TRACEF(Dump, "ReadV() for " << readVnum << " chunks.");
788 
789  m_state_cond.Lock();
790 
791  if (m_in_shutdown || io->m_in_detach)
792  {
793  m_state_cond.UnLock();
794  return m_in_shutdown ? -ENOENT : -EBADF;
795  }
796 
797  // Shortcut -- file is fully downloaded.
798 
799  if (m_cfi.IsComplete())
800  {
801  m_state_cond.UnLock();
802  int ret = m_data_file->ReadV(const_cast<XrdOucIOVec*>(readV), readVnum);
803  if (ret > 0) {
804  XrdSysCondVarHelper _lck(m_state_cond);
805  m_delta_stats.AddBytesHit(ret);
806  check_delta_stats();
807  }
808  return ret;
809  }
810 
811  return ReadOpusCoalescere(io, readV, readVnum, rh, "ReadV() ");
812 }
813 
814 //------------------------------------------------------------------------------
815 
816 int File::ReadOpusCoalescere(IO *io, const XrdOucIOVec *readV, int readVnum,
817  ReadReqRH *rh, const char *tpfx)
818 {
819  // Non-trivial processing for Read and ReadV.
820  // Entered under lock.
821  //
822  // loop over reqired blocks:
823  // - if on disk, ok;
824  // - if in ram or incoming, inc ref-count
825  // - otherwise request and inc ref count (unless RAM full => request direct)
826  // unlock
827 
828  int prefetch_cnt = 0;
829 
830  ReadRequest *read_req = nullptr;
831  BlockList_t blks_to_request; // blocks we are issuing a new remote request for
832 
833  std::unordered_map<Block*, std::vector<ChunkRequest>> blks_ready;
834 
835  std::vector<XrdOucIOVec> iovec_disk;
836  std::vector<XrdOucIOVec> iovec_direct;
837  int iovec_disk_total = 0;
838  int iovec_direct_total = 0;
839 
840  for (int iov_idx = 0; iov_idx < readVnum; ++iov_idx)
841  {
842  const XrdOucIOVec &iov = readV[iov_idx];
843  long long iUserOff = iov.offset;
844  int iUserSize = iov.size;
845  char *iUserBuff = iov.data;
846 
847  const int idx_first = iUserOff / m_block_size;
848  const int idx_last = (iUserOff + iUserSize - 1) / m_block_size;
849 
850  TRACEF(DumpXL, tpfx << "sid: " << Xrd::hex1 << rh->m_seq_id << " idx_first: " << idx_first << " idx_last: " << idx_last);
851 
852  enum LastBlock_e { LB_other, LB_disk, LB_direct };
853 
854  LastBlock_e lbe = LB_other;
855 
856  for (int block_idx = idx_first; block_idx <= idx_last; ++block_idx)
857  {
858  TRACEF(DumpXL, tpfx << "sid: " << Xrd::hex1 << rh->m_seq_id << " idx: " << block_idx);
859  BlockMap_i bi = m_block_map.find(block_idx);
860 
861  // overlap and read
862  long long off; // offset in user buffer
863  long long blk_off; // offset in block
864  int size; // size to copy
865 
866  overlap(block_idx, m_block_size, iUserOff, iUserSize, off, blk_off, size);
867 
868  // In RAM or incoming?
869  if (bi != m_block_map.end())
870  {
871  inc_ref_count(bi->second);
872  TRACEF(Dump, tpfx << (void*) iUserBuff << " inc_ref_count for existing block " << bi->second << " idx = " << block_idx);
873 
874  if (bi->second->is_finished())
875  {
876  // note, blocks with error should not be here !!!
877  // they should be either removed or reissued in ProcessBlockResponse()
878  assert(bi->second->is_ok());
879 
880  blks_ready[bi->second].emplace_back( ChunkRequest(nullptr, iUserBuff + off, blk_off, size) );
881 
882  if (bi->second->m_prefetch)
883  ++prefetch_cnt;
884  }
885  else
886  {
887  if ( ! read_req)
888  read_req = new ReadRequest(io, rh);
889 
890  // We have a lock on state_cond --> as we register the request before releasing the lock,
891  // we are sure to get a call-in via the ChunkRequest handling when this block arrives.
892 
893  bi->second->m_chunk_reqs.emplace_back( ChunkRequest(read_req, iUserBuff + off, blk_off, size) );
894  ++read_req->m_n_chunk_reqs;
895  }
896 
897  lbe = LB_other;
898  }
899  // On disk?
900  else if (m_cfi.TestBitWritten(offsetIdx(block_idx)))
901  {
902  TRACEF(DumpXL, tpfx << "read from disk " << (void*)iUserBuff << " idx = " << block_idx);
903 
904  if (lbe == LB_disk)
905  iovec_disk.back().size += size;
906  else
907  iovec_disk.push_back( { block_idx * m_block_size + blk_off, size, 0, iUserBuff + off } );
908  iovec_disk_total += size;
909 
910  if (m_cfi.TestBitPrefetch(offsetIdx(block_idx)))
911  ++prefetch_cnt;
912 
913  lbe = LB_disk;
914  }
915  // Neither ... then we have to go get it ...
916  else
917  {
918  if ( ! read_req)
919  read_req = new ReadRequest(io, rh);
920 
921  // Is there room for one more RAM Block?
922  Block *b = PrepareBlockRequest(block_idx, io, read_req, false);
923  if (b)
924  {
925  TRACEF(Dump, tpfx << "inc_ref_count new " << (void*)iUserBuff << " idx = " << block_idx);
926  inc_ref_count(b);
927  blks_to_request.push_back(b);
928 
929  b->m_chunk_reqs.emplace_back(ChunkRequest(read_req, iUserBuff + off, blk_off, size));
930  ++read_req->m_n_chunk_reqs;
931 
932  lbe = LB_other;
933  }
934  else // Nope ... read this directly without caching.
935  {
936  TRACEF(DumpXL, tpfx << "direct block " << block_idx << ", blk_off " << blk_off << ", size " << size);
937 
938  iovec_direct_total += size;
939  read_req->m_direct_done = false;
940 
941  // Make sure we do not issue a ReadV with chunk size above XrdProto::maxRVdsz.
942  // Number of actual ReadVs issued so as to not exceed the XrdProto::maxRvecsz limit
943  // is determined in the RequestBlocksDirect().
944  if (lbe == LB_direct && iovec_direct.back().size + size <= XrdProto::maxRVdsz) {
945  iovec_direct.back().size += size;
946  } else {
947  long long in_offset = block_idx * m_block_size + blk_off;
948  char *out_pos = iUserBuff + off;
949  while (size > XrdProto::maxRVdsz) {
950  iovec_direct.push_back( { in_offset, XrdProto::maxRVdsz, 0, out_pos } );
951  in_offset += XrdProto::maxRVdsz;
952  out_pos += XrdProto::maxRVdsz;
953  size -= XrdProto::maxRVdsz;
954  }
955  iovec_direct.push_back( { in_offset, size, 0, out_pos } );
956  }
957 
958  lbe = LB_direct;
959  }
960  }
961  } // end for over blocks in an IOVec
962  } // end for over readV IOVec
963 
964  inc_prefetch_hit_cnt(prefetch_cnt);
965 
966  m_state_cond.UnLock();
967 
968  // First, send out remote requests for new blocks.
969  if ( ! blks_to_request.empty())
970  {
971  ProcessBlockRequests(blks_to_request);
972  blks_to_request.clear();
973  }
974 
975  // Second, send out remote direct read requests.
976  if ( ! iovec_direct.empty())
977  {
978  RequestBlocksDirect(io, read_req, iovec_direct, iovec_direct_total);
979 
980  TRACEF(Dump, tpfx << "direct read requests sent out, n_chunks = " << (int) iovec_direct.size() << ", total_size = " << iovec_direct_total);
981  }
982 
983  // Begin synchronous part where we process data that is already in RAM or on disk.
984 
985  long long bytes_read = 0;
986  int error_cond = 0; // to be set to -errno
987 
988  // Third, process blocks that are available in RAM.
989  if ( ! blks_ready.empty())
990  {
991  for (auto &bvi : blks_ready)
992  {
993  for (auto &cr : bvi.second)
994  {
995  TRACEF(DumpXL, tpfx << "ub=" << (void*)cr.m_buf << " from pre-finished block " << bvi.first->m_offset/m_block_size << " size " << cr.m_size);
996  memcpy(cr.m_buf, bvi.first->m_buff + cr.m_off, cr.m_size);
997  bytes_read += cr.m_size;
998  }
999  }
1000  }
1001 
1002  // Fourth, read blocks from disk.
1003  if ( ! iovec_disk.empty())
1004  {
1005  int rc = ReadBlocksFromDisk(iovec_disk, iovec_disk_total);
1006  TRACEF(DumpXL, tpfx << "from disk finished size = " << rc);
1007  if (rc >= 0)
1008  {
1009  bytes_read += rc;
1010  }
1011  else
1012  {
1013  error_cond = rc;
1014  TRACEF(Error, tpfx << "failed read from disk");
1015  }
1016  }
1017 
1018  // End synchronous part -- update with sync stats and determine actual state of this read.
1019  // Note: remote reads might have already finished during disk-read!
1020 
1021  m_state_cond.Lock();
1022 
1023  for (auto &bvi : blks_ready)
1024  dec_ref_count(bvi.first, (int) bvi.second.size());
1025 
1026  if (read_req)
1027  {
1028  read_req->m_bytes_read += bytes_read;
1029  if (error_cond)
1030  read_req->update_error_cond(error_cond);
1031  read_req->m_stats.m_BytesHit += bytes_read;
1032  read_req->m_sync_done = true;
1033 
1034  if (read_req->is_complete())
1035  {
1036  // Almost like FinalizeReadRequest(read_req) -- but no callout!
1037  m_delta_stats.AddReadStats(read_req->m_stats);
1038  check_delta_stats();
1039  m_state_cond.UnLock();
1040 
1041  int ret = read_req->return_value();
1042  delete read_req;
1043  return ret;
1044  }
1045  else
1046  {
1047  m_state_cond.UnLock();
1048  return -EWOULDBLOCK;
1049  }
1050  }
1051  else
1052  {
1053  m_delta_stats.m_BytesHit += bytes_read;
1054  check_delta_stats();
1055  m_state_cond.UnLock();
1056 
1057  // !!! No callout.
1058 
1059  return error_cond ? error_cond : bytes_read;
1060  }
1061 }
1062 
1063 
1064 //==============================================================================
1065 // WriteBlock and Sync
1066 //==============================================================================
1067 
1069 {
1070  // write block buffer into disk file
1071  long long offset = b->m_offset - m_offset;
1072  long long size = b->get_size();
1073  ssize_t retval;
1074 
1075  if (m_cfi.IsCkSumCache())
1076  if (b->has_cksums())
1077  retval = m_data_file->pgWrite(b->get_buff(), offset, size, b->ref_cksum_vec().data(), 0);
1078  else
1079  retval = m_data_file->pgWrite(b->get_buff(), offset, size, 0, 0);
1080  else
1081  retval = m_data_file->Write(b->get_buff(), offset, size);
1082 
1083  if (retval < size)
1084  {
1085  if (retval < 0) {
1086  TRACEF(Error, "WriteToDisk() write error " << retval);
1087  } else {
1088  TRACEF(Error, "WriteToDisk() incomplete block write ret=" << retval << " (should be " << size << ")");
1089  }
1090 
1091  XrdSysCondVarHelper _lck(m_state_cond);
1092 
1093  dec_ref_count(b);
1094 
1095  return;
1096  }
1097 
1098  const int blk_idx = (b->m_offset - m_offset) / m_block_size;
1099 
1100  // Set written bit.
1101  TRACEF(Dump, "WriteToDisk() success set bit for block " << b->m_offset << " size=" << size);
1102 
1103  bool schedule_sync = false;
1104  {
1105  XrdSysCondVarHelper _lck(m_state_cond);
1106 
1107  m_cfi.SetBitWritten(blk_idx);
1108 
1109  if (b->m_prefetch)
1110  {
1111  m_cfi.SetBitPrefetch(blk_idx);
1112  }
1113  if (b->req_cksum_net() && ! b->has_cksums() && m_cfi.IsCkSumNet())
1114  {
1115  m_cfi.ResetCkSumNet();
1116  }
1117 
1118  dec_ref_count(b);
1119 
1120  // Set synced bit or stash block index if in actual sync.
1121  // Synced state is only written out to cinfo file when data file is synced.
1122  if (m_in_sync)
1123  {
1124  m_writes_during_sync.push_back(blk_idx);
1125  }
1126  else
1127  {
1128  m_cfi.SetBitSynced(blk_idx);
1129  ++m_non_flushed_cnt;
1130  if ((m_cfi.IsComplete() || m_non_flushed_cnt >= Cache::GetInstance().RefConfiguration().m_flushCnt) &&
1131  ! m_in_shutdown)
1132  {
1133  schedule_sync = true;
1134  m_in_sync = true;
1135  m_non_flushed_cnt = 0;
1136  }
1137  }
1138  }
1139 
1140  if (schedule_sync)
1141  {
1142  cache()->ScheduleFileSync(this);
1143  }
1144 }
1145 
1146 //------------------------------------------------------------------------------
1147 
1149 {
1150  TRACEF(Dump, "Sync()");
1151 
1152  int ret = m_data_file->Fsync();
1153  bool errorp = false;
1154  if (ret == XrdOssOK)
1155  {
1156  Stats loc_stats;
1157  {
1158  XrdSysCondVarHelper _lck(&m_state_cond);
1159  report_and_merge_delta_stats();
1160  loc_stats = m_stats;
1161  }
1162  m_cfi.WriteIOStat(loc_stats);
1163  m_cfi.Write(m_info_file, m_filename.c_str());
1164  int cret = m_info_file->Fsync();
1165  if (cret != XrdOssOK)
1166  {
1167  TRACEF(Error, "Sync cinfo file sync error " << cret);
1168  errorp = true;
1169  }
1170  }
1171  else
1172  {
1173  TRACEF(Error, "Sync data file sync error " << ret << ", cinfo file has not been updated");
1174  errorp = true;
1175  }
1176 
1177  if (errorp)
1178  {
1179  TRACEF(Error, "Sync failed, unlinking local files and initiating shutdown of File object");
1180 
1181  // Unlink will also call this->initiate_emergency_shutdown()
1182  Cache::GetInstance().UnlinkFile(m_filename, false);
1183 
1184  XrdSysCondVarHelper _lck(&m_state_cond);
1185 
1186  m_writes_during_sync.clear();
1187  m_in_sync = false;
1188 
1189  return;
1190  }
1191 
1192  int written_while_in_sync;
1193  bool resync = false;
1194  {
1195  XrdSysCondVarHelper _lck(&m_state_cond);
1196  for (std::vector<int>::iterator i = m_writes_during_sync.begin(); i != m_writes_during_sync.end(); ++i)
1197  {
1198  m_cfi.SetBitSynced(*i);
1199  }
1200  written_while_in_sync = m_non_flushed_cnt = (int) m_writes_during_sync.size();
1201  m_writes_during_sync.clear();
1202 
1203  // If there were writes during sync and the file is now complete,
1204  // let us call Sync again without resetting the m_in_sync flag.
1205  if (written_while_in_sync > 0 && m_cfi.IsComplete() && ! m_in_shutdown)
1206  resync = true;
1207  else
1208  m_in_sync = false;
1209  }
1210  TRACEF(Dump, "Sync "<< written_while_in_sync << " blocks written during sync." << (resync ? " File is now complete - resyncing." : ""));
1211 
1212  if (resync)
1213  Sync();
1214 }
1215 
1216 
1217 //==============================================================================
1218 // Block processing
1219 //==============================================================================
1220 
1221 void File::free_block(Block* b)
1222 {
1223  // Method always called under lock.
1224  int i = b->m_offset / m_block_size;
1225  TRACEF(Dump, "free_block block " << b << " idx = " << i);
1226  size_t ret = m_block_map.erase(i);
1227  if (ret != 1)
1228  {
1229  // assert might be a better option than a warning
1230  TRACEF(Error, "free_block did not erase " << i << " from map");
1231  }
1232  else
1233  {
1234  cache()->ReleaseRAM(b->m_buff, b->m_req_size);
1235  delete b;
1236  }
1237 
1238  if (m_prefetch_state == kHold && (int) m_block_map.size() < Cache::GetInstance().RefConfiguration().m_prefetch_max_blocks)
1239  {
1240  m_prefetch_state = kOn;
1241  cache()->RegisterPrefetchFile(this);
1242  }
1243 }
1244 
1245 //------------------------------------------------------------------------------
1246 
1247 bool File::select_current_io_or_disable_prefetching(bool skip_current)
1248 {
1249  // Method always called under lock. It also expects prefetch to be active.
1250 
1251  int io_size = (int) m_io_set.size();
1252  bool io_ok = false;
1253 
1254  if (io_size == 1)
1255  {
1256  io_ok = (*m_io_set.begin())->m_allow_prefetching;
1257  if (io_ok)
1258  {
1259  m_current_io = m_io_set.begin();
1260  }
1261  }
1262  else if (io_size > 1)
1263  {
1264  IoSet_i mi = m_current_io;
1265  if (skip_current && mi != m_io_set.end()) ++mi;
1266 
1267  for (int i = 0; i < io_size; ++i)
1268  {
1269  if (mi == m_io_set.end()) mi = m_io_set.begin();
1270 
1271  if ((*mi)->m_allow_prefetching)
1272  {
1273  m_current_io = mi;
1274  io_ok = true;
1275  break;
1276  }
1277  ++mi;
1278  }
1279  }
1280 
1281  if ( ! io_ok)
1282  {
1283  m_current_io = m_io_set.end();
1284  m_prefetch_state = kStopped;
1285  cache()->DeRegisterPrefetchFile(this);
1286  }
1287 
1288  return io_ok;
1289 }
1290 
1291 //------------------------------------------------------------------------------
1292 
1293 void File::ProcessDirectReadFinished(ReadRequest *rreq, int bytes_read, int error_cond)
1294 {
1295  // Called from DirectResponseHandler.
1296  // NOT under lock.
1297 
1298  if (error_cond)
1299  TRACEF(Error, "Read(), direct read finished with error " << -error_cond << " " << XrdSysE2T(-error_cond));
1300 
1301  m_state_cond.Lock();
1302 
1303  if (error_cond)
1304  rreq->update_error_cond(error_cond);
1305  else {
1306  rreq->m_stats.m_BytesBypassed += bytes_read;
1307  rreq->m_bytes_read += bytes_read;
1308  }
1309 
1310  rreq->m_direct_done = true;
1311 
1312  bool rreq_complete = rreq->is_complete();
1313 
1314  m_state_cond.UnLock();
1315 
1316  if (rreq_complete)
1317  FinalizeReadRequest(rreq);
1318 }
1319 
1320 void File::ProcessBlockError(Block *b, ReadRequest *rreq)
1321 {
1322  // Called from ProcessBlockResponse().
1323  // YES under lock -- we have to protect m_block_map for recovery through multiple IOs.
1324  // Does not manage m_read_req.
1325  // Will not complete the request.
1326 
1327  TRACEF(Debug, "ProcessBlockError() io " << b->m_io << ", block "<< b->m_offset/m_block_size <<
1328  " finished with error " << -b->get_error() << " " << XrdSysE2T(-b->get_error()));
1329 
1330  rreq->update_error_cond(b->get_error());
1331  --rreq->m_n_chunk_reqs;
1332 
1333  dec_ref_count(b);
1334 }
1335 
1336 void File::ProcessBlockSuccess(Block *b, ChunkRequest &creq)
1337 {
1338  // Called from ProcessBlockResponse().
1339  // NOT under lock as it does memcopy ofor exisf block data.
1340  // Acquires lock for block, m_read_req and rreq state update.
1341 
1342  ReadRequest *rreq = creq.m_read_req;
1343 
1344  TRACEF(Dump, "ProcessBlockSuccess() ub=" << (void*)creq.m_buf << " from finished block " << b->m_offset/m_block_size << " size " << creq.m_size);
1345  memcpy(creq.m_buf, b->m_buff + creq.m_off, creq.m_size);
1346 
1347  m_state_cond.Lock();
1348 
1349  rreq->m_bytes_read += creq.m_size;
1350 
1351  if (b->get_req_id() == (void*) rreq)
1352  rreq->m_stats.m_BytesMissed += creq.m_size;
1353  else
1354  rreq->m_stats.m_BytesHit += creq.m_size;
1355 
1356  --rreq->m_n_chunk_reqs;
1357 
1358  if (b->m_prefetch)
1359  inc_prefetch_hit_cnt(1);
1360 
1361  dec_ref_count(b);
1362 
1363  bool rreq_complete = rreq->is_complete();
1364 
1365  m_state_cond.UnLock();
1366 
1367  if (rreq_complete)
1368  FinalizeReadRequest(rreq);
1369 }
1370 
1371 void File::FinalizeReadRequest(ReadRequest *rreq)
1372 {
1373  // called from ProcessBlockResponse()
1374  // NOT under lock -- does callout
1375  {
1376  XrdSysCondVarHelper _lck(m_state_cond);
1377  m_delta_stats.AddReadStats(rreq->m_stats);
1378  check_delta_stats();
1379  }
1380 
1381  rreq->m_rh->Done(rreq->return_value());
1382  delete rreq;
1383 }
1384 
1385 void File::ProcessBlockResponse(Block *b, int res)
1386 {
1387  static const char* tpfx = "ProcessBlockResponse ";
1388 
1389  TRACEF(Dump, tpfx << "block=" << b << ", idx=" << b->m_offset/m_block_size << ", off=" << b->m_offset << ", res=" << res);
1390 
1391  if (res >= 0 && res != b->get_size())
1392  {
1393  // Incorrect number of bytes received, apparently size of the file on the remote
1394  // is different than what the cache expects it to be.
1395  TRACEF(Error, tpfx << "Wrong number of bytes received, assuming remote/local file size mismatch, unlinking local files and initiating shutdown of File object");
1396  Cache::GetInstance().UnlinkFile(m_filename, false);
1397  }
1398 
1399  m_state_cond.Lock();
1400 
1401  // Deregister block from IO's prefetch count, if needed.
1402  if (b->m_prefetch)
1403  {
1404  IO *io = b->get_io();
1405  IoSet_i mi = m_io_set.find(io);
1406  if (mi != m_io_set.end())
1407  {
1408  --io->m_active_prefetches;
1409 
1410  // If failed and IO is still prefetching -- disable prefetching on this IO.
1411  if (res < 0 && io->m_allow_prefetching)
1412  {
1413  TRACEF(Debug, tpfx << "after failed prefetch on io " << io << " disabling prefetching on this io.");
1414  io->m_allow_prefetching = false;
1415 
1416  // Check if any IO is still available for prfetching. If not, stop it.
1417  if (m_prefetch_state == kOn || m_prefetch_state == kHold)
1418  {
1419  if ( ! select_current_io_or_disable_prefetching(false) )
1420  {
1421  TRACEF(Debug, tpfx << "stopping prefetching after io " << b->get_io() << " marked as bad.");
1422  }
1423  }
1424  }
1425 
1426  // If failed with no subscribers -- delete the block and exit.
1427  if (b->m_refcnt == 0 && (res < 0 || m_in_shutdown))
1428  {
1429  free_block(b);
1430  m_state_cond.UnLock();
1431  return;
1432  }
1433  m_prefetch_bytes += b->get_size();
1434  }
1435  else
1436  {
1437  TRACEF(Error, tpfx << "io " << b->get_io() << " not found in IoSet.");
1438  }
1439  }
1440 
1441  if (res == b->get_size())
1442  {
1443  b->set_downloaded();
1444  TRACEF(Dump, tpfx << "inc_ref_count idx=" << b->m_offset/m_block_size);
1445  if ( ! m_in_shutdown)
1446  {
1447  // Increase ref-count for the writer.
1448  inc_ref_count(b);
1449  m_delta_stats.AddWriteStats(b->get_size(), b->get_n_cksum_errors());
1450  // No check for writes, report-and-merge forced during Sync().
1451  cache()->AddWriteTask(b, true);
1452  }
1453 
1454  // Swap chunk-reqs vector out of Block, it will be processed outside of lock.
1455  vChunkRequest_t creqs_to_notify;
1456  creqs_to_notify.swap( b->m_chunk_reqs );
1457 
1458  m_state_cond.UnLock();
1459 
1460  for (auto &creq : creqs_to_notify)
1461  {
1462  ProcessBlockSuccess(b, creq);
1463  }
1464  }
1465  else
1466  {
1467  if (res < 0) {
1468  bool new_error = b->get_io()->register_block_error(res);
1469  int tlvl = new_error ? TRACE_Error : TRACE_Debug;
1470  TRACEF_INT(tlvl, tpfx << "block " << b << ", idx=" << b->m_offset/m_block_size << ", off=" << b->m_offset
1471  << ", io=" << b->get_io() << ", error=" << res);
1472  } else {
1473  bool first_p = b->get_io()->register_incomplete_read();
1474  int tlvl = first_p ? TRACE_Error : TRACE_Debug;
1475  TRACEF_INT(tlvl, tpfx << "block " << b << ", idx=" << b->m_offset/m_block_size << ", off=" << b->m_offset
1476  << ", io=" << b->get_io() << " incomplete, got " << res << " expected " << b->get_size());
1477 #if defined(__APPLE__) || defined(__GNU__) || (defined(__FreeBSD_kernel__) && defined(__GLIBC__)) || defined(__FreeBSD__)
1478  res = -EIO;
1479 #else
1480  res = -EREMOTEIO;
1481 #endif
1482  }
1483  b->set_error(res);
1484 
1485  // Loop over Block's chunk-reqs vector, error out ones with the same IO.
1486  // Collect others with a different IO, the first of them will be used to reissue the request.
1487  // This is then done outside of lock.
1488  std::list<ReadRequest*> rreqs_to_complete;
1489  vChunkRequest_t creqs_to_keep;
1490 
1491  for(ChunkRequest &creq : b->m_chunk_reqs)
1492  {
1493  ReadRequest *rreq = creq.m_read_req;
1494 
1495  if (rreq->m_io == b->get_io())
1496  {
1497  ProcessBlockError(b, rreq);
1498  if (rreq->is_complete())
1499  {
1500  rreqs_to_complete.push_back(rreq);
1501  }
1502  }
1503  else
1504  {
1505  creqs_to_keep.push_back(creq);
1506  }
1507  }
1508 
1509  bool reissue = false;
1510  if ( ! creqs_to_keep.empty())
1511  {
1512  ReadRequest *rreq = creqs_to_keep.front().m_read_req;
1513 
1514  TRACEF(Debug, "ProcessBlockResponse() requested block " << (void*)b << " failed with another io " <<
1515  b->get_io() << " - reissuing request with my io " << rreq->m_io);
1516 
1517  b->reset_error_and_set_io(rreq->m_io, rreq);
1518  b->m_chunk_reqs.swap( creqs_to_keep );
1519  reissue = true;
1520  }
1521 
1522  m_state_cond.UnLock();
1523 
1524  for (auto rreq : rreqs_to_complete)
1525  FinalizeReadRequest(rreq);
1526 
1527  if (reissue)
1528  ProcessBlockRequest(b);
1529  }
1530 }
1531 
1532 //------------------------------------------------------------------------------
1533 
1534 const char* File::lPath() const
1535 {
1536  return m_filename.c_str();
1537 }
1538 
1539 //------------------------------------------------------------------------------
1540 
1541 int File::offsetIdx(int iIdx) const
1542 {
1543  return iIdx - m_offset/m_block_size;
1544 }
1545 
1546 
1547 //------------------------------------------------------------------------------
1548 
1550 {
1551  // Check that block is not on disk and not in RAM.
1552  // TODO: Could prefetch several blocks at once!
1553  // blks_max could be an argument
1554 
1555  BlockList_t blks;
1556 
1557  TRACEF(DumpXL, "Prefetch() entering.");
1558  {
1559  XrdSysCondVarHelper _lck(m_state_cond);
1560 
1561  if (m_prefetch_state != kOn)
1562  {
1563  return;
1564  }
1565 
1566  if ( ! select_current_io_or_disable_prefetching(true) )
1567  {
1568  TRACEF(Error, "Prefetch no available IO object found, prefetching stopped. This should not happen, i.e., prefetching should be stopped before.");
1569  return;
1570  }
1571 
1572  // Select block(s) to fetch.
1573  for (int f = 0; f < m_num_blocks; ++f)
1574  {
1575  if ( ! m_cfi.TestBitWritten(f))
1576  {
1577  int f_act = f + m_offset / m_block_size;
1578 
1579  BlockMap_i bi = m_block_map.find(f_act);
1580  if (bi == m_block_map.end())
1581  {
1582  Block *b = PrepareBlockRequest(f_act, *m_current_io, nullptr, true);
1583  if (b)
1584  {
1585  TRACEF(Dump, "Prefetch take block " << f_act);
1586  blks.push_back(b);
1587  // Note: block ref_cnt not increased, it will be when placed into write queue.
1588 
1589  inc_prefetch_read_cnt(1);
1590  }
1591  else
1592  {
1593  // This shouldn't happen as prefetching stops when RAM is 70% full.
1594  TRACEF(Warning, "Prefetch allocation failed for block " << f_act);
1595  }
1596  break;
1597  }
1598  }
1599  }
1600 
1601  if (blks.empty())
1602  {
1603  TRACEF(Debug, "Prefetch file is complete, stopping prefetch.");
1604  m_prefetch_state = kComplete;
1605  cache()->DeRegisterPrefetchFile(this);
1606  }
1607  else
1608  {
1609  (*m_current_io)->m_active_prefetches += (int) blks.size();
1610  }
1611  }
1612 
1613  if ( ! blks.empty())
1614  {
1615  ProcessBlockRequests(blks);
1616  }
1617 }
1618 
1619 
1620 //------------------------------------------------------------------------------
1621 
1623 {
1624  return m_prefetch_score;
1625 }
1626 
1628 {
1629  return Cache::GetInstance().GetLog();
1630 }
1631 
1633 {
1634  return Cache::GetInstance().GetTrace();
1635 }
1636 
1637 void File::insert_remote_location(const std::string &loc)
1638 {
1639  if ( ! loc.empty())
1640  {
1641  size_t p = loc.find_first_of('@');
1642  m_remote_locations.insert(&loc[p != std::string::npos ? p + 1 : 0]);
1643  }
1644 }
1645 
1646 std::string File::GetRemoteLocations() const
1647 {
1648  std::string s;
1649  if ( ! m_remote_locations.empty())
1650  {
1651  size_t sl = 0;
1652  int nl = 0;
1653  for (std::set<std::string>::iterator i = m_remote_locations.begin(); i != m_remote_locations.end(); ++i, ++nl)
1654  {
1655  sl += i->size();
1656  }
1657  s.reserve(2 + sl + 2*nl + nl - 1 + 1);
1658  s = '[';
1659  int j = 1;
1660  for (std::set<std::string>::iterator i = m_remote_locations.begin(); i != m_remote_locations.end(); ++i, ++j)
1661  {
1662  s += '"'; s += *i; s += '"';
1663  if (j < nl) s += ',';
1664  }
1665  s += ']';
1666  }
1667  else
1668  {
1669  s = "[]";
1670  }
1671  return s;
1672 }
1673 
1674 //==============================================================================
1675 //======================= RESPONSE HANDLERS ==============================
1676 //==============================================================================
1677 
1679 {
1680  m_block->m_file->ProcessBlockResponse(m_block, res);
1681  delete this;
1682 }
1683 
1684 //------------------------------------------------------------------------------
1685 
1687 {
1688  m_mutex.Lock();
1689 
1690  int n_left = --m_to_wait;
1691 
1692  if (res < 0) {
1693  if (m_errno == 0) m_errno = res; // store first reported error
1694  } else {
1695  m_bytes_read += res;
1696  }
1697 
1698  m_mutex.UnLock();
1699 
1700  if (n_left == 0)
1701  {
1702  m_file->ProcessDirectReadFinished(m_read_req, m_bytes_read, m_errno);
1703  delete this;
1704  }
1705 }
#define TRACE_Debug
Definition: XrdCmsTrace.hh:37
@ Warning
#define XrdOssOK
Definition: XrdOss.hh:50
#define XRDOSS_mkpath
Definition: XrdOss.hh:466
#define TRACE_Error
Definition: XrdPfcTrace.hh:7
#define TRACE_Dump
Definition: XrdPfcTrace.hh:11
#define TRACEF(act, x)
Definition: XrdPfcTrace.hh:67
#define ERRNO_AND_ERRSTR(err_code)
Definition: XrdPfcTrace.hh:46
#define TRACEF_INT(act, x)
Definition: XrdPfcTrace.hh:71
int stat(const char *path, struct stat *buf)
#define XRD_TRACE
Definition: XrdScheduler.cc:48
XrdOucString File
const char * XrdSysE2T(int errcode)
Definition: XrdSysE2T.cc:104
#define TRACE(act, x)
Definition: XrdTrace.hh:63
virtual int Fsync()
Definition: XrdOss.hh:144
virtual int Ftruncate(unsigned long long flen)
Definition: XrdOss.hh:164
virtual int Fstat(struct stat *buf)
Definition: XrdOss.hh:136
virtual int Close(long long *retsz=0)=0
virtual int getFD()
Definition: XrdOss.hh:426
virtual int Open(const char *path, int Oflag, mode_t Mode, XrdOucEnv &env)
Definition: XrdOss.hh:200
virtual ssize_t Read(off_t offset, size_t size)
Definition: XrdOss.hh:281
virtual ssize_t pgWrite(void *buffer, off_t offset, size_t wrlen, uint32_t *csvec, uint64_t opts)
Definition: XrdOss.cc:198
virtual ssize_t ReadV(XrdOucIOVec *readV, int rdvcnt)
Definition: XrdOss.cc:236
virtual ssize_t Write(const void *buffer, off_t offset, size_t size)
Definition: XrdOss.hh:345
virtual int Create(const char *tid, const char *path, mode_t mode, XrdOucEnv &env, int opts=0)=0
virtual XrdOssDF * newFile(const char *tident)=0
virtual int Stat(const char *path, struct stat *buff, int opts=0, XrdOucEnv *envP=0)=0
virtual void Done(int result)=0
virtual int pgRead(char *buff, long long offs, int rdlen, std::vector< uint32_t > &csvec, uint64_t opts=0, int *csfix=0)
Definition: XrdOucCache.cc:39
virtual int ReadV(const XrdOucIOVec *readV, int rnum)
Definition: XrdOucCache.cc:86
void Put(const char *varname, const char *value)
Definition: XrdOucEnv.hh:85
void Done(int result) override
Definition: XrdPfcFile.cc:1678
int * ptr_n_cksum_errors()
Definition: XrdPfcFile.hh:163
int get_size() const
Definition: XrdPfcFile.hh:136
int get_error() const
Definition: XrdPfcFile.hh:150
int get_n_cksum_errors()
Definition: XrdPfcFile.hh:162
void * get_req_id() const
Definition: XrdPfcFile.hh:142
long long get_offset() const
Definition: XrdPfcFile.hh:138
vChunkRequest_t m_chunk_reqs
Definition: XrdPfcFile.hh:125
void set_error(int err)
Definition: XrdPfcFile.hh:149
vCkSum_t & ref_cksum_vec()
Definition: XrdPfcFile.hh:161
char * get_buff() const
Definition: XrdPfcFile.hh:135
IO * get_io() const
Definition: XrdPfcFile.hh:141
void set_downloaded()
Definition: XrdPfcFile.hh:148
bool req_cksum_net() const
Definition: XrdPfcFile.hh:159
bool has_cksums() const
Definition: XrdPfcFile.hh:160
long long m_offset
Definition: XrdPfcFile.hh:114
void reset_error_and_set_io(IO *io, void *rid)
Definition: XrdPfcFile.hh:152
int get_req_size() const
Definition: XrdPfcFile.hh:137
Attaches/creates and detaches/deletes cache-io objects for disk based cache.
Definition: XrdPfc.hh:152
XrdOss * GetOss() const
Definition: XrdPfc.hh:268
XrdSysTrace * GetTrace()
Definition: XrdPfc.hh:283
const Configuration & RefConfiguration() const
Reference XrdPfc configuration.
Definition: XrdPfc.hh:204
static ResourceMonitor & ResMon()
Definition: XrdPfc.cc:135
XrdSysError * GetLog()
Definition: XrdPfc.hh:282
static Cache & GetInstance()
Singleton access.
Definition: XrdPfc.cc:132
int UnlinkFile(const std::string &f_name, bool fail_if_open)
Remove cinfo and data files from cache.
Definition: XrdPfc.cc:1188
void Done(int result) override
Definition: XrdPfcFile.cc:1686
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
int ReadV(IO *io, const XrdOucIOVec *readV, int readVnum, ReadReqRH *rh)
Vector read.
Definition: XrdPfcFile.cc:785
XrdSysTrace * GetTrace()
Definition: XrdPfcFile.cc:1632
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
float GetPrefetchScore() const
Definition: XrdPfcFile.cc:1622
friend class BlockResponseHandler
Definition: XrdPfcFile.hh:205
XrdSysError * GetLog()
Definition: XrdPfcFile.cc:1627
void Prefetch()
Definition: XrdPfcFile.cc:1549
std::string GetRemoteLocations() const
Definition: XrdPfcFile.cc:1646
int Fstat(struct stat &sbuff)
Definition: XrdPfcFile.cc:563
void AddIO(IO *io)
Definition: XrdPfcFile.cc:346
void RequestSyncOfDetachStats()
Flags that detach stats should be written out in final sync. Called from CacheIO upon Detach.
Definition: XrdPfcFile.cc:316
void BlocksRemovedFromWriteQ(std::list< Block * > &)
Handle removal of a set of blocks from Cache's write queue.
Definition: XrdPfcFile.cc:216
friend class DirectResponseHandler
Definition: XrdPfcFile.hh:206
void Sync()
Sync file cache inf o and output data with disk.
Definition: XrdPfcFile.cc:1148
int Read(IO *io, char *buff, long long offset, int size, ReadReqRH *rh)
Normal read.
Definition: XrdPfcFile.cc:748
void ioUpdated(IO *io)
Notification from IO that it has been updated (remote open).
Definition: XrdPfcFile.cc:230
long long initiate_emergency_shutdown()
Definition: XrdPfcFile.cc:151
void RemoveIO(IO *io)
Definition: XrdPfcFile.cc:383
void BlockRemovedFromWriteQ(Block *)
Handle removal of a block from Cache's write queue.
Definition: XrdPfcFile.cc:208
bool ioActive(IO *io)
Initiate close. Return true if still IO active. Used in XrdPosixXrootd::Close()
Definition: XrdPfcFile.cc:239
Base cache-io class that implements some XrdOucCacheIO abstract methods.
Definition: XrdPfcIO.hh:16
bool register_incomplete_read()
Definition: XrdPfcIO.hh:90
XrdOucCacheIO * GetInput()
Definition: XrdPfcIO.cc:31
bool register_block_error(int res)
Definition: XrdPfcIO.hh:93
RAtomic_int m_active_read_reqs
number of active read requests
Definition: XrdPfcIO.hh:70
const char * GetLocation()
Definition: XrdPfcIO.hh:44
Status of cached file. Can be read from and written into a binary file.
Definition: XrdPfcInfo.hh:41
void SetBitPrefetch(int i)
Mark block as obtained through prefetch.
Definition: XrdPfcInfo.hh:365
static const char * s_infoExtension
Definition: XrdPfcInfo.hh:309
void SetBitSynced(int i)
Mark block as synced to disk.
Definition: XrdPfcInfo.hh:387
time_t GetNoCkSumTimeForUVKeep() const
Definition: XrdPfcInfo.hh:301
CkSumCheck_e GetCkSumState() const
Definition: XrdPfcInfo.hh:286
void WriteIOStatAttach()
Write open time in the last entry of access statistics.
Definition: XrdPfcInfo.cc:420
void ResetCkSumNet()
Definition: XrdPfcInfo.cc:213
bool Write(XrdOssDF *fp, const char *dname, const char *fname=0)
Definition: XrdPfcInfo.cc:266
void DowngradeCkSumState(CkSumCheck_e css_ref)
Definition: XrdPfcInfo.hh:295
bool IsCkSumNet() const
Definition: XrdPfcInfo.hh:290
void ResetAllAccessStats()
Reset IO Stats.
Definition: XrdPfcInfo.cc:359
bool TestBitPrefetch(int i) const
Test if block at the given index has been prefetched.
Definition: XrdPfcInfo.hh:376
bool IsComplete() const
Get complete status.
Definition: XrdPfcInfo.hh:447
bool IsCkSumCache() const
Definition: XrdPfcInfo.hh:289
void SetBitWritten(int i)
Mark block as written to disk.
Definition: XrdPfcInfo.hh:352
long long GetBufferSize() const
Get prefetch buffer size.
Definition: XrdPfcInfo.hh:469
void WriteIOStat(Stats &s)
Write bytes missed, hits, and disk.
Definition: XrdPfcInfo.cc:429
long long GetExpectedDataFileSize() const
Get expected data file size.
Definition: XrdPfcInfo.hh:420
bool TestBitWritten(int i) const
Test if block at the given index is written to disk.
Definition: XrdPfcInfo.hh:343
bool Read(XrdOssDF *fp, const char *dname, const char *fname=0)
Read content of cinfo file into this object.
Definition: XrdPfcInfo.cc:294
void SetCkSumState(CkSumCheck_e css)
Definition: XrdPfcInfo.hh:294
void ResetNoCkSumTime()
Definition: XrdPfcInfo.hh:302
void SetBufferSizeFileSizeAndCreationTime(long long bs, long long fs)
Definition: XrdPfcInfo.cc:161
void WriteIOStatDetach(Stats &s)
Write close time together with bytes missed, hits, and disk.
Definition: XrdPfcInfo.cc:438
int GetNBlocks() const
Get number of blocks represented in download-state bit-vector.
Definition: XrdPfcInfo.hh:437
void CrossCheckIfScanIsInProgress(const std::string &lfn, XrdSysCondVar &cond)
int register_file_open(const std::string &filename, time_t open_timestamp, bool existing_file)
void register_file_purge(DirState *target, long long size_in_st_blocks)
void register_file_update_stats(int token_id, const Stats &stats)
void register_file_close(int token_id, time_t close_timestamp, const Stats &full_stats)
Statistics of cache utilisation by a File object.
Definition: XrdPfcStats.hh:35
void IoAttach()
Definition: XrdPfcStats.hh:85
void AddReadStats(const Stats &s)
Definition: XrdPfcStats.hh:67
long long m_StBlocksAdded
number of 512-byte blocks the file has grown by
Definition: XrdPfcStats.hh:43
long long m_BytesBypassed
number of bytes served directly through XrdCl
Definition: XrdPfcStats.hh:41
void AddUp(const Stats &s)
Definition: XrdPfcStats.hh:119
void AddWriteStats(long long bytes_written, int n_cks_errs)
Definition: XrdPfcStats.hh:79
long long BytesReadAndWritten() const
Definition: XrdPfcStats.hh:102
void AddBytesHit(long long bh)
Definition: XrdPfcStats.hh:74
long long m_BytesHit
number of bytes served from disk
Definition: XrdPfcStats.hh:39
long long m_BytesWritten
number of bytes written to disk
Definition: XrdPfcStats.hh:42
void IoDetach(int duration)
Definition: XrdPfcStats.hh:90
OpenImpl< false > Open(Ctx< File > file, Arg< std::string > url, Arg< OpenFlags::Flags > flags, Arg< Access::Mode > mode=Access::None, uint16_t timeout=0)
Factory for creating ReadImpl objects.
Definition: XrdPfc.hh:41
std::vector< ChunkRequest > vChunkRequest_t
Definition: XrdPfcFile.hh:101
std::list< Block * > BlockList_t
Definition: XrdPfcFile.hh:166
std::list< Block * >::iterator BlockList_i
Definition: XrdPfcFile.hh:167
static const int maxRVdsz
Definition: XProtocol.hh:688
static const int maxRvecsz
Definition: XProtocol.hh:686
@ hex1
Definition: XrdSysTrace.hh:42
long long offset
Definition: XrdOucIOVec.hh:42
char * data
Definition: XrdOucIOVec.hh:45
ReadRequest * m_read_req
Definition: XrdPfcFile.hh:91
Contains parameters configurable from the xrootd config file.
Definition: XrdPfc.hh:64
long long m_flushCnt
nuber of unsynced blcoks on disk before flush is called
Definition: XrdPfc.hh:116
bool does_cschk_have_missing_bits(CkSumCheck_e cks_on_file) const
Definition: XrdPfc.hh:80
CkSumCheck_e get_cs_Chk() const
Definition: XrdPfc.hh:73
int m_prefetch_max_blocks
maximum number of blocks to prefetch per file
Definition: XrdPfc.hh:113
bool should_uvkeep_purge(time_t delta) const
Definition: XrdPfc.hh:82
std::string m_data_space
oss space for data files
Definition: XrdPfc.hh:88
long long m_bufferSize
prefetch buffer size, default 1MB
Definition: XrdPfc.hh:108
std::string m_meta_space
oss space for metadata files (cinfo)
Definition: XrdPfc.hh:89
std::string m_username
username passed to oss plugin
Definition: XrdPfc.hh:87
unsigned short m_seq_id
Definition: XrdPfcFile.hh:53
void update_error_cond(int ec)
Definition: XrdPfcFile.hh:81
ReadReqRH * m_rh
Definition: XrdPfcFile.hh:66
bool is_complete() const
Definition: XrdPfcFile.hh:83
int return_value() const
Definition: XrdPfcFile.hh:84
long long m_bytes_read
Definition: XrdPfcFile.hh:68