src/ceph/src/journal/JournalRecorder.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #include "journal/JournalRecorder.h"
   5 #include "common/errno.h"
   6 #include "journal/Entry.h"
   7 #include "journal/Utils.h"
   8
   9 #include <atomic>
  10
  11 #define dout_subsys ceph_subsys_journaler
  12 #undef dout_prefix
  13 #define dout_prefix *_dout << "JournalRecorder: " << this << " "
  14
  15 using std::shared_ptr;
  16
  17 namespace journal {
  18
  19 namespace {
  20
  21 struct C_Flush : public Context {
  22   JournalMetadataPtr journal_metadata;
  23   Context *on_finish;
  24   std::atomic<int64_t> pending_flushes = { 0 };
  25   int ret_val;
  26
  27   C_Flush(JournalMetadataPtr _journal_metadata, Context *_on_finish,
  28           size_t _pending_flushes)
  29     : journal_metadata(_journal_metadata), on_finish(_on_finish),
  30       pending_flushes(_pending_flushes), ret_val(0) {
  31   }
  32
  33   void complete(int r) override {
  34     if (r < 0 && ret_val == 0) {
  35       ret_val = r;
  36     }
  37     if (--pending_flushes == 0) {
  38       // ensure all prior callback have been flushed as well
  39       journal_metadata->queue(on_finish, ret_val);
  40       delete this;
  41     }
  42   }
  43   void finish(int r) override {
  44   }
  45 };
  46
  47 } // anonymous namespace
  48
  49 JournalRecorder::JournalRecorder(librados::IoCtx &ioctx,
  50                                  const std::string &object_oid_prefix,
  51                                  const JournalMetadataPtr& journal_metadata,
  52                                  uint32_t flush_interval, uint64_t flush_bytes,
  53                                  double flush_age)
  54   : m_cct(NULL), m_object_oid_prefix(object_oid_prefix),
  55     m_journal_metadata(journal_metadata), m_flush_interval(flush_interval),
  56     m_flush_bytes(flush_bytes), m_flush_age(flush_age), m_listener(this),
  57     m_object_handler(this), m_lock("JournalerRecorder::m_lock"),
  58     m_current_set(m_journal_metadata->get_active_set()) {
  59
  60   Mutex::Locker locker(m_lock);
  61   m_ioctx.dup(ioctx);
  62   m_cct = reinterpret_cast<CephContext*>(m_ioctx.cct());
  63
  64   uint8_t splay_width = m_journal_metadata->get_splay_width();
  65   for (uint8_t splay_offset = 0; splay_offset < splay_width; ++splay_offset) {
  66     m_object_locks.push_back(shared_ptr<Mutex>(
  67                                           new Mutex("ObjectRecorder::m_lock::"+
  68                                           std::to_string(splay_offset))));
  69     uint64_t object_number = splay_offset + (m_current_set * splay_width);
  70     m_object_ptrs[splay_offset] = create_object_recorder(
  71                                                 object_number,
  72                                                 m_object_locks[splay_offset]);
  73   }
  74
  75   m_journal_metadata->add_listener(&m_listener);
  76 }
  77
  78 JournalRecorder::~JournalRecorder() {
  79   m_journal_metadata->remove_listener(&m_listener);
  80
  81   Mutex::Locker locker(m_lock);
  82   assert(m_in_flight_advance_sets == 0);
  83   assert(m_in_flight_object_closes == 0);
  84 }
  85
  86 Future JournalRecorder::append(uint64_t tag_tid,
  87                                const bufferlist &payload_bl) {
  88
  89   m_lock.Lock();
  90
  91   uint64_t entry_tid = m_journal_metadata->allocate_entry_tid(tag_tid);
  92   uint8_t splay_width = m_journal_metadata->get_splay_width();
  93   uint8_t splay_offset = entry_tid % splay_width;
  94
  95   ObjectRecorderPtr object_ptr = get_object(splay_offset);
  96   uint64_t commit_tid = m_journal_metadata->allocate_commit_tid(
  97     object_ptr->get_object_number(), tag_tid, entry_tid);
  98   FutureImplPtr future(new FutureImpl(tag_tid, entry_tid, commit_tid));
  99   future->init(m_prev_future);
 100   m_prev_future = future;
 101
 102   m_object_locks[splay_offset]->Lock();
 103   m_lock.Unlock();
 104
 105   bufferlist entry_bl;
 106   ::encode(Entry(future->get_tag_tid(), future->get_entry_tid(), payload_bl),
 107            entry_bl);
 108   assert(entry_bl.length() <= m_journal_metadata->get_object_size());
 109
 110   bool object_full = object_ptr->append_unlock({{future, entry_bl}});
 111   if (object_full) {
 112     ldout(m_cct, 10) << "object " << object_ptr->get_oid() << " now full"
 113                      << dendl;
 114     Mutex::Locker l(m_lock);
 115     close_and_advance_object_set(object_ptr->get_object_number() / splay_width);
 116   }
 117   return Future(future);
 118 }
 119
 120 void JournalRecorder::flush(Context *on_safe) {
 121   C_Flush *ctx;
 122   {
 123     Mutex::Locker locker(m_lock);
 124
 125     ctx = new C_Flush(m_journal_metadata, on_safe, m_object_ptrs.size() + 1);
 126     for (ObjectRecorderPtrs::iterator it = m_object_ptrs.begin();
 127          it != m_object_ptrs.end(); ++it) {
 128       it->second->flush(ctx);
 129     }
 130
 131   }
 132
 133   // avoid holding the lock in case there is nothing to flush
 134   ctx->complete(0);
 135 }
 136
 137 ObjectRecorderPtr JournalRecorder::get_object(uint8_t splay_offset) {
 138   assert(m_lock.is_locked());
 139
 140   ObjectRecorderPtr object_recoder = m_object_ptrs[splay_offset];
 141   assert(object_recoder != NULL);
 142   return object_recoder;
 143 }
 144
 145 void JournalRecorder::close_and_advance_object_set(uint64_t object_set) {
 146   assert(m_lock.is_locked());
 147
 148   // entry overflow from open object
 149   if (m_current_set != object_set) {
 150     ldout(m_cct, 20) << __func__ << ": close already in-progress" << dendl;
 151     return;
 152   }
 153
 154   // we shouldn't overflow upon append if already closed and we
 155   // shouldn't receive an overflowed callback if already closed
 156   assert(m_in_flight_advance_sets == 0);
 157   assert(m_in_flight_object_closes == 0);
 158
 159   uint64_t active_set = m_journal_metadata->get_active_set();
 160   assert(m_current_set == active_set);
 161   ++m_current_set;
 162   ++m_in_flight_advance_sets;
 163
 164   ldout(m_cct, 20) << __func__ << ": closing active object set "
 165                    << object_set << dendl;
 166   if (close_object_set(m_current_set)) {
 167     advance_object_set();
 168   }
 169 }
 170
 171 void JournalRecorder::advance_object_set() {
 172   assert(m_lock.is_locked());
 173
 174   assert(m_in_flight_object_closes == 0);
 175   ldout(m_cct, 20) << __func__ << ": advance to object set " << m_current_set
 176                    << dendl;
 177   m_journal_metadata->set_active_set(m_current_set, new C_AdvanceObjectSet(
 178     this));
 179 }
 180
 181 void JournalRecorder::handle_advance_object_set(int r) {
 182   Mutex::Locker locker(m_lock);
 183   ldout(m_cct, 20) << __func__ << ": r=" << r << dendl;
 184
 185   assert(m_in_flight_advance_sets > 0);
 186   --m_in_flight_advance_sets;
 187
 188   if (r < 0 && r != -ESTALE) {
 189     lderr(m_cct) << __func__ << ": failed to advance object set: "
 190                  << cpp_strerror(r) << dendl;
 191   }
 192
 193   if (m_in_flight_advance_sets == 0 && m_in_flight_object_closes == 0) {
 194     open_object_set();
 195   }
 196 }
 197
 198 void JournalRecorder::open_object_set() {
 199   assert(m_lock.is_locked());
 200
 201   ldout(m_cct, 10) << __func__ << ": opening object set " << m_current_set
 202                    << dendl;
 203
 204   uint8_t splay_width = m_journal_metadata->get_splay_width();
 205
 206   lock_object_recorders();
 207   for (ObjectRecorderPtrs::iterator it = m_object_ptrs.begin();
 208        it != m_object_ptrs.end(); ++it) {
 209     ObjectRecorderPtr object_recorder = it->second;
 210     uint64_t object_number = object_recorder->get_object_number();
 211     if (object_number / splay_width != m_current_set) {
 212       assert(object_recorder->is_closed());
 213
 214       // ready to close object and open object in active set
 215       create_next_object_recorder_unlock(object_recorder);
 216     } else {
 217       uint8_t splay_offset = object_number % splay_width;
 218       m_object_locks[splay_offset]->Unlock();
 219     }
 220   }
 221 }
 222
 223 bool JournalRecorder::close_object_set(uint64_t active_set) {
 224   assert(m_lock.is_locked());
 225
 226   // object recorders will invoke overflow handler as they complete
 227   // closing the object to ensure correct order of future appends
 228   uint8_t splay_width = m_journal_metadata->get_splay_width();
 229   lock_object_recorders();
 230   for (ObjectRecorderPtrs::iterator it = m_object_ptrs.begin();
 231        it != m_object_ptrs.end(); ++it) {
 232     ObjectRecorderPtr object_recorder = it->second;
 233     if (object_recorder->get_object_number() / splay_width != active_set) {
 234       ldout(m_cct, 10) << __func__ << ": closing object "
 235                        << object_recorder->get_oid() << dendl;
 236       // flush out all queued appends and hold future appends
 237       if (!object_recorder->close()) {
 238         ++m_in_flight_object_closes;
 239       } else {
 240         ldout(m_cct, 20) << __func__ << ": object "
 241                          << object_recorder->get_oid() << " closed" << dendl;
 242       }
 243     }
 244   }
 245   unlock_object_recorders();
 246   return (m_in_flight_object_closes == 0);
 247 }
 248
 249 ObjectRecorderPtr JournalRecorder::create_object_recorder(
 250     uint64_t object_number, shared_ptr<Mutex> lock) {
 251   ObjectRecorderPtr object_recorder(new ObjectRecorder(
 252     m_ioctx, utils::get_object_name(m_object_oid_prefix, object_number),
 253     object_number, lock, m_journal_metadata->get_work_queue(),
 254     m_journal_metadata->get_timer(), m_journal_metadata->get_timer_lock(),
 255     &m_object_handler, m_journal_metadata->get_order(), m_flush_interval,
 256     m_flush_bytes, m_flush_age));
 257   return object_recorder;
 258 }
 259
 260 void JournalRecorder::create_next_object_recorder_unlock(
 261     ObjectRecorderPtr object_recorder) {
 262   assert(m_lock.is_locked());
 263
 264   uint64_t object_number = object_recorder->get_object_number();
 265   uint8_t splay_width = m_journal_metadata->get_splay_width();
 266   uint8_t splay_offset = object_number % splay_width;
 267
 268   assert(m_object_locks[splay_offset]->is_locked());
 269
 270   ObjectRecorderPtr new_object_recorder = create_object_recorder(
 271      (m_current_set * splay_width) + splay_offset, m_object_locks[splay_offset]);
 272
 273   ldout(m_cct, 10) << __func__ << ": "
 274                    << "old oid=" << object_recorder->get_oid() << ", "
 275                    << "new oid=" << new_object_recorder->get_oid() << dendl;
 276   AppendBuffers append_buffers;
 277   object_recorder->claim_append_buffers(&append_buffers);
 278
 279   // update the commit record to point to the correct object number
 280   for (auto &append_buffer : append_buffers) {
 281     m_journal_metadata->overflow_commit_tid(
 282       append_buffer.first->get_commit_tid(),
 283       new_object_recorder->get_object_number());
 284   }
 285
 286   new_object_recorder->append_unlock(std::move(append_buffers));
 287   m_object_ptrs[splay_offset] = new_object_recorder;
 288 }
 289
 290 void JournalRecorder::handle_update() {
 291   Mutex::Locker locker(m_lock);
 292
 293   uint64_t active_set = m_journal_metadata->get_active_set();
 294   if (m_current_set < active_set) {
 295     // peer journal client advanced the active set
 296     ldout(m_cct, 20) << __func__ << ": "
 297                      << "current_set=" << m_current_set << ", "
 298                      << "active_set=" << active_set << dendl;
 299
 300     uint64_t current_set = m_current_set;
 301     m_current_set = active_set;
 302     if (m_in_flight_advance_sets == 0 && m_in_flight_object_closes == 0) {
 303       ldout(m_cct, 20) << __func__ << ": closing current object set "
 304                        << current_set << dendl;
 305       if (close_object_set(active_set)) {
 306         open_object_set();
 307       }
 308     }
 309   }
 310 }
 311
 312 void JournalRecorder::handle_closed(ObjectRecorder *object_recorder) {
 313   ldout(m_cct, 10) << __func__ << ": " << object_recorder->get_oid() << dendl;
 314
 315   Mutex::Locker locker(m_lock);
 316
 317   uint64_t object_number = object_recorder->get_object_number();
 318   uint8_t splay_width = m_journal_metadata->get_splay_width();
 319   uint8_t splay_offset = object_number % splay_width;
 320   ObjectRecorderPtr active_object_recorder = m_object_ptrs[splay_offset];
 321   assert(active_object_recorder->get_object_number() == object_number);
 322
 323   assert(m_in_flight_object_closes > 0);
 324   --m_in_flight_object_closes;
 325
 326   // object closed after advance active set committed
 327   ldout(m_cct, 20) << __func__ << ": object "
 328                    << active_object_recorder->get_oid() << " closed" << dendl;
 329   if (m_in_flight_object_closes == 0) {
 330     if (m_in_flight_advance_sets == 0) {
 331       // peer forced closing of object set
 332       open_object_set();
 333     } else {
 334       // local overflow advanced object set
 335       advance_object_set();
 336     }
 337   }
 338 }
 339
 340 void JournalRecorder::handle_overflow(ObjectRecorder *object_recorder) {
 341   ldout(m_cct, 10) << __func__ << ": " << object_recorder->get_oid() << dendl;
 342
 343   Mutex::Locker locker(m_lock);
 344
 345   uint64_t object_number = object_recorder->get_object_number();
 346   uint8_t splay_width = m_journal_metadata->get_splay_width();
 347   uint8_t splay_offset = object_number % splay_width;
 348   ObjectRecorderPtr active_object_recorder = m_object_ptrs[splay_offset];
 349   assert(active_object_recorder->get_object_number() == object_number);
 350
 351   ldout(m_cct, 20) << __func__ << ": object "
 352                    << active_object_recorder->get_oid() << " overflowed"
 353                    << dendl;
 354   close_and_advance_object_set(object_number / splay_width);
 355 }
 356
 357 } // namespace journal