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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 | Context *m_flush_ctx = nullptr; | |
130 | Context *m_on_aio_ready = nullptr; | |
131 | ||
132 | void handle_event(const AioDiscardEvent &event, Context *on_ready, | |
133 | Context *on_safe); | |
134 | void handle_event(const AioWriteEvent &event, Context *on_ready, | |
135 | Context *on_safe); | |
136 | void handle_event(const AioWriteSameEvent &event, Context *on_ready, | |
137 | Context *on_safe); | |
138 | void handle_event(const AioFlushEvent &event, Context *on_ready, | |
139 | Context *on_safe); | |
140 | void handle_event(const OpFinishEvent &event, Context *on_ready, | |
141 | Context *on_safe); | |
142 | void handle_event(const SnapCreateEvent &event, Context *on_ready, | |
143 | Context *on_safe); | |
144 | void handle_event(const SnapRemoveEvent &event, Context *on_ready, | |
145 | Context *on_safe); | |
146 | void handle_event(const SnapRenameEvent &event, Context *on_ready, | |
147 | Context *on_safe); | |
148 | void handle_event(const SnapProtectEvent &event, Context *on_ready, | |
149 | Context *on_safe); | |
150 | void handle_event(const SnapUnprotectEvent &event, Context *on_ready, | |
151 | Context *on_safe); | |
152 | void handle_event(const SnapRollbackEvent &event, Context *on_ready, | |
153 | Context *on_safe); | |
154 | void handle_event(const RenameEvent &event, Context *on_ready, | |
155 | Context *on_safe); | |
156 | void handle_event(const ResizeEvent &event, Context *on_ready, | |
157 | Context *on_safe); | |
158 | void handle_event(const FlattenEvent &event, Context *on_ready, | |
159 | Context *on_safe); | |
160 | void handle_event(const DemotePromoteEvent &event, Context *on_ready, | |
161 | Context *on_safe); | |
162 | void handle_event(const SnapLimitEvent &event, Context *on_ready, | |
163 | Context *on_safe); | |
164 | void handle_event(const UpdateFeaturesEvent &event, Context *on_ready, | |
165 | Context *on_safe); | |
166 | void handle_event(const MetadataSetEvent &event, Context *on_ready, | |
167 | Context *on_safe); | |
168 | void handle_event(const MetadataRemoveEvent &event, Context *on_ready, | |
169 | Context *on_safe); | |
170 | void handle_event(const UnknownEvent &event, Context *on_ready, | |
171 | Context *on_safe); | |
172 | ||
173 | void handle_aio_modify_complete(Context *on_ready, Context *on_safe, int r); | |
174 | void handle_aio_flush_complete(Context *on_flush_safe, Contexts &on_safe_ctxs, | |
175 | int r); | |
176 | ||
177 | Context *create_op_context_callback(uint64_t op_tid, Context *on_ready, | |
178 | Context *on_safe, OpEvent **op_event); | |
179 | void handle_op_complete(uint64_t op_tid, int r); | |
180 | ||
181 | io::AioCompletion *create_aio_modify_completion(Context *on_ready, | |
182 | Context *on_safe, | |
183 | io::aio_type_t aio_type, | |
184 | bool *flush_required); | |
185 | io::AioCompletion *create_aio_flush_completion(Context *on_safe); | |
186 | void handle_aio_completion(io::AioCompletion *aio_comp); | |
187 | ||
188 | }; | |
189 | ||
190 | } // namespace journal | |
191 | } // namespace librbd | |
192 | ||
193 | extern template class librbd::journal::Replay<librbd::ImageCtx>; | |
194 | ||
195 | #endif // CEPH_LIBRBD_JOURNAL_REPLAY_H |