ceph/src/librbd/journal/Replay.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #ifndef CEPH_LIBRBD_JOURNAL_REPLAY_H
   5 #define CEPH_LIBRBD_JOURNAL_REPLAY_H
   6
   7 #include "include/int_types.h"
   8 #include "include/buffer_fwd.h"
   9 #include "include/Context.h"
  10 #include "common/Mutex.h"
  11 #include "librbd/io/Types.h"
  12 #include "librbd/journal/Types.h"
  13 #include <boost/variant.hpp>
  14 #include <list>
  15 #include <unordered_set>
  16 #include <unordered_map>
  17
  18 namespace librbd {
  19
  20 class ImageCtx;
  21 namespace io { struct AioCompletion; }
  22
  23 namespace journal {
  24
  25 template <typename ImageCtxT = ImageCtx>
  26 class Replay {
  27 public:
  28   static Replay *create(ImageCtxT &image_ctx) {
  29     return new Replay(image_ctx);
  30   }
  31
  32   Replay(ImageCtxT &image_ctx);
  33   ~Replay();
  34
  35   int decode(bufferlist::iterator *it, EventEntry *event_entry);
  36   void process(const EventEntry &event_entry,
  37                Context *on_ready, Context *on_safe);
  38
  39   void shut_down(bool cancel_ops, Context *on_finish);
  40   void flush(Context *on_finish);
  41
  42   void replay_op_ready(uint64_t op_tid, Context *on_resume);
  43
  44 private:
  45   typedef std::unordered_set<int> ReturnValues;
  46
  47   struct OpEvent {
  48     bool op_in_progress = false;
  49     bool finish_on_ready = false;
  50     Context *on_op_finish_event = nullptr;
  51     Context *on_start_ready = nullptr;
  52     Context *on_start_safe = nullptr;
  53     Context *on_finish_ready = nullptr;
  54     Context *on_finish_safe = nullptr;
  55     Context *on_op_complete = nullptr;
  56     ReturnValues op_finish_error_codes;
  57     ReturnValues ignore_error_codes;
  58   };
  59
  60   typedef std::list<uint64_t> OpTids;
  61   typedef std::list<Context *> Contexts;
  62   typedef std::unordered_set<Context *> ContextSet;
  63   typedef std::unordered_map<uint64_t, OpEvent> OpEvents;
  64
  65   struct C_OpOnComplete : public Context {
  66     Replay *replay;
  67     uint64_t op_tid;
  68     C_OpOnComplete(Replay *replay, uint64_t op_tid)
  69       : replay(replay), op_tid(op_tid) {
  70     }
  71     void finish(int r) override {
  72       replay->handle_op_complete(op_tid, r);
  73     }
  74   };
  75
  76   struct C_AioModifyComplete : public Context {
  77     Replay *replay;
  78     Context *on_ready;
  79     Context *on_safe;
  80     C_AioModifyComplete(Replay *replay, Context *on_ready, Context *on_safe)
  81       : replay(replay), on_ready(on_ready), on_safe(on_safe) {
  82     }
  83     void finish(int r) override {
  84       replay->handle_aio_modify_complete(on_ready, on_safe, r);
  85     }
  86   };
  87
  88   struct C_AioFlushComplete : public Context {
  89     Replay *replay;
  90     Context *on_flush_safe;
  91     Contexts on_safe_ctxs;
  92     C_AioFlushComplete(Replay *replay, Context *on_flush_safe,
  93                        Contexts &&on_safe_ctxs)
  94       : replay(replay), on_flush_safe(on_flush_safe),
  95         on_safe_ctxs(on_safe_ctxs) {
  96     }
  97     void finish(int r) override {
  98       replay->handle_aio_flush_complete(on_flush_safe, on_safe_ctxs, r);
  99     }
 100   };
 101
 102   struct EventVisitor : public boost::static_visitor<void> {
 103     Replay *replay;
 104     Context *on_ready;
 105     Context *on_safe;
 106
 107     EventVisitor(Replay *_replay, Context *_on_ready, Context *_on_safe)
 108       : replay(_replay), on_ready(_on_ready), on_safe(_on_safe) {
 109     }
 110
 111     template <typename Event>
 112     inline void operator()(const Event &event) const {
 113       replay->handle_event(event, on_ready, on_safe);
 114     }
 115   };
 116
 117   ImageCtxT &m_image_ctx;
 118
 119   Mutex m_lock;
 120
 121   uint64_t m_in_flight_aio_flush = 0;
 122   uint64_t m_in_flight_aio_modify = 0;
 123   Contexts m_aio_modify_unsafe_contexts;
 124   ContextSet m_aio_modify_safe_contexts;
 125
 126   OpEvents m_op_events;
 127   uint64_t m_in_flight_op_events = 0;
 128
 129   bool m_shut_down = false;
 130   Context *m_flush_ctx = nullptr;
 131   Context *m_on_aio_ready = nullptr;
 132
 133   void handle_event(const AioDiscardEvent &event, Context *on_ready,
 134                     Context *on_safe);
 135   void handle_event(const AioWriteEvent &event, Context *on_ready,
 136                     Context *on_safe);
 137   void handle_event(const AioWriteSameEvent &event, Context *on_ready,
 138                     Context *on_safe);
 139   void handle_event(const AioFlushEvent &event, Context *on_ready,
 140                     Context *on_safe);
 141   void handle_event(const OpFinishEvent &event, Context *on_ready,
 142                     Context *on_safe);
 143   void handle_event(const SnapCreateEvent &event, Context *on_ready,
 144                     Context *on_safe);
 145   void handle_event(const SnapRemoveEvent &event, Context *on_ready,
 146                     Context *on_safe);
 147   void handle_event(const SnapRenameEvent &event, Context *on_ready,
 148                     Context *on_safe);
 149   void handle_event(const SnapProtectEvent &event, Context *on_ready,
 150                     Context *on_safe);
 151   void handle_event(const SnapUnprotectEvent &event, Context *on_ready,
 152                     Context *on_safe);
 153   void handle_event(const SnapRollbackEvent &event, Context *on_ready,
 154                     Context *on_safe);
 155   void handle_event(const RenameEvent &event, Context *on_ready,
 156                     Context *on_safe);
 157   void handle_event(const ResizeEvent &event, Context *on_ready,
 158                     Context *on_safe);
 159   void handle_event(const FlattenEvent &event, Context *on_ready,
 160                     Context *on_safe);
 161   void handle_event(const DemotePromoteEvent &event, Context *on_ready,
 162                     Context *on_safe);
 163   void handle_event(const SnapLimitEvent &event, Context *on_ready,
 164                     Context *on_safe);
 165   void handle_event(const UpdateFeaturesEvent &event, Context *on_ready,
 166                     Context *on_safe);
 167   void handle_event(const MetadataSetEvent &event, Context *on_ready,
 168                     Context *on_safe);
 169   void handle_event(const MetadataRemoveEvent &event, Context *on_ready,
 170                     Context *on_safe);
 171   void handle_event(const UnknownEvent &event, Context *on_ready,
 172                     Context *on_safe);
 173
 174   void handle_aio_modify_complete(Context *on_ready, Context *on_safe, int r);
 175   void handle_aio_flush_complete(Context *on_flush_safe, Contexts &on_safe_ctxs,
 176                                  int r);
 177
 178   Context *create_op_context_callback(uint64_t op_tid, Context *on_ready,
 179                                       Context *on_safe, OpEvent **op_event);
 180   void handle_op_complete(uint64_t op_tid, int r);
 181
 182   io::AioCompletion *create_aio_modify_completion(Context *on_ready,
 183                                                   Context *on_safe,
 184                                                   io::aio_type_t aio_type,
 185                                                   bool *flush_required);
 186   io::AioCompletion *create_aio_flush_completion(Context *on_safe);
 187   void handle_aio_completion(io::AioCompletion *aio_comp);
 188
 189 };
 190
 191 } // namespace journal
 192 } // namespace librbd
 193
 194 extern template class librbd::journal::Replay<librbd::ImageCtx>;
 195
 196 #endif // CEPH_LIBRBD_JOURNAL_REPLAY_H