1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
|
// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef CEPH_LIBRBD_MANAGED_LOCK_H
#define CEPH_LIBRBD_MANAGED_LOCK_H
#include "include/int_types.h"
#include "include/Context.h"
#include "include/rados/librados.hpp"
#include "common/AsyncOpTracker.h"
#include "cls/lock/cls_lock_types.h"
#include "librbd/watcher/Types.h"
#include "librbd/managed_lock/Types.h"
#include <list>
#include <string>
#include <utility>
namespace librbd {
struct AsioEngine;
struct ImageCtx;
namespace asio { struct ContextWQ; }
namespace managed_lock { struct Locker; }
template <typename ImageCtxT = librbd::ImageCtx>
class ManagedLock {
private:
typedef watcher::Traits<ImageCtxT> TypeTraits;
typedef typename TypeTraits::Watcher Watcher;
public:
static ManagedLock *create(librados::IoCtx& ioctx,
AsioEngine& asio_engine,
const std::string& oid, Watcher *watcher,
managed_lock::Mode mode,
bool blocklist_on_break_lock,
uint32_t blocklist_expire_seconds) {
return new ManagedLock(ioctx, asio_engine, oid, watcher, mode,
blocklist_on_break_lock, blocklist_expire_seconds);
}
void destroy() {
delete this;
}
ManagedLock(librados::IoCtx& ioctx, AsioEngine& asio_engine,
const std::string& oid, Watcher *watcher,
managed_lock::Mode mode, bool blocklist_on_break_lock,
uint32_t blocklist_expire_seconds);
virtual ~ManagedLock();
bool is_lock_owner() const;
void shut_down(Context *on_shutdown);
void acquire_lock(Context *on_acquired);
void try_acquire_lock(Context *on_acquired);
void release_lock(Context *on_released);
void reacquire_lock(Context *on_reacquired);
void get_locker(managed_lock::Locker *locker, Context *on_finish);
void break_lock(const managed_lock::Locker &locker, bool force_break_lock,
Context *on_finish);
int assert_header_locked();
bool is_shutdown() const {
std::lock_guard l{m_lock};
return is_state_shutdown();
}
protected:
mutable ceph::mutex m_lock;
inline void set_state_uninitialized() {
ceph_assert(ceph_mutex_is_locked(m_lock));
ceph_assert(m_state == STATE_UNLOCKED);
m_state = STATE_UNINITIALIZED;
}
inline void set_state_initializing() {
ceph_assert(ceph_mutex_is_locked(m_lock));
ceph_assert(m_state == STATE_UNINITIALIZED);
m_state = STATE_INITIALIZING;
}
inline void set_state_unlocked() {
ceph_assert(ceph_mutex_is_locked(m_lock));
ceph_assert(m_state == STATE_INITIALIZING || m_state == STATE_RELEASING);
m_state = STATE_UNLOCKED;
}
inline void set_state_waiting_for_lock() {
ceph_assert(ceph_mutex_is_locked(m_lock));
ceph_assert(m_state == STATE_ACQUIRING);
m_state = STATE_WAITING_FOR_LOCK;
}
inline void set_state_post_acquiring() {
ceph_assert(ceph_mutex_is_locked(m_lock));
ceph_assert(m_state == STATE_ACQUIRING);
m_state = STATE_POST_ACQUIRING;
}
bool is_state_shutdown() const;
inline bool is_state_acquiring() const {
ceph_assert(ceph_mutex_is_locked(m_lock));
return m_state == STATE_ACQUIRING;
}
inline bool is_state_post_acquiring() const {
ceph_assert(ceph_mutex_is_locked(m_lock));
return m_state == STATE_POST_ACQUIRING;
}
inline bool is_state_releasing() const {
ceph_assert(ceph_mutex_is_locked(m_lock));
return m_state == STATE_RELEASING;
}
inline bool is_state_pre_releasing() const {
ceph_assert(ceph_mutex_is_locked(m_lock));
return m_state == STATE_PRE_RELEASING;
}
inline bool is_state_locked() const {
ceph_assert(ceph_mutex_is_locked(m_lock));
return m_state == STATE_LOCKED;
}
inline bool is_state_waiting_for_lock() const {
ceph_assert(ceph_mutex_is_locked(m_lock));
return m_state == STATE_WAITING_FOR_LOCK;
}
inline bool is_action_acquire_lock() const {
ceph_assert(ceph_mutex_is_locked(m_lock));
return get_active_action() == ACTION_ACQUIRE_LOCK;
}
virtual void shutdown_handler(int r, Context *on_finish);
virtual void pre_acquire_lock_handler(Context *on_finish);
virtual void post_acquire_lock_handler(int r, Context *on_finish);
virtual void pre_release_lock_handler(bool shutting_down,
Context *on_finish);
virtual void post_release_lock_handler(bool shutting_down, int r,
Context *on_finish);
virtual void post_reacquire_lock_handler(int r, Context *on_finish);
void execute_next_action();
private:
/**
* @verbatim
*
* <start>
* |
* |
* v (acquire_lock)
* UNLOCKED -----------------------------------------> ACQUIRING
* ^ |
* | |
* RELEASING |
* | |
* | |
* | (release_lock) v
* PRE_RELEASING <----------------------------------------- LOCKED
*
* <LOCKED state>
* |
* v
* REACQUIRING -------------------------------------> <finish>
* . ^
* . |
* . . . > <RELEASE action> ---> <ACQUIRE action> ---/
*
* <UNLOCKED/LOCKED states>
* |
* |
* v
* PRE_SHUTTING_DOWN ---> SHUTTING_DOWN ---> SHUTDOWN ---> <finish>
*
* @endverbatim
*/
enum State {
STATE_UNINITIALIZED,
STATE_INITIALIZING,
STATE_UNLOCKED,
STATE_LOCKED,
STATE_ACQUIRING,
STATE_POST_ACQUIRING,
STATE_WAITING_FOR_REGISTER,
STATE_WAITING_FOR_LOCK,
STATE_REACQUIRING,
STATE_PRE_RELEASING,
STATE_RELEASING,
STATE_PRE_SHUTTING_DOWN,
STATE_SHUTTING_DOWN,
STATE_SHUTDOWN,
};
enum Action {
ACTION_TRY_LOCK,
ACTION_ACQUIRE_LOCK,
ACTION_REACQUIRE_LOCK,
ACTION_RELEASE_LOCK,
ACTION_SHUT_DOWN
};
typedef std::list<Context *> Contexts;
typedef std::pair<Action, Contexts> ActionContexts;
typedef std::list<ActionContexts> ActionsContexts;
struct C_ShutDownRelease : public Context {
ManagedLock *lock;
C_ShutDownRelease(ManagedLock *lock)
: lock(lock) {
}
void finish(int r) override {
lock->send_shutdown_release();
}
};
librados::IoCtx& m_ioctx;
CephContext *m_cct;
AsioEngine& m_asio_engine;
asio::ContextWQ* m_work_queue;
std::string m_oid;
Watcher *m_watcher;
managed_lock::Mode m_mode;
bool m_blocklist_on_break_lock;
uint32_t m_blocklist_expire_seconds;
std::string m_cookie;
std::string m_new_cookie;
State m_state;
State m_post_next_state;
ActionsContexts m_actions_contexts;
AsyncOpTracker m_async_op_tracker;
bool is_lock_owner(ceph::mutex &lock) const;
bool is_transition_state() const;
void append_context(Action action, Context *ctx);
void execute_action(Action action, Context *ctx);
Action get_active_action() const;
void complete_active_action(State next_state, int r);
void send_acquire_lock();
void handle_pre_acquire_lock(int r);
void handle_acquire_lock(int r);
void handle_no_op_reacquire_lock(int r);
void handle_post_acquire_lock(int r);
void revert_to_unlock_state(int r);
void send_reacquire_lock();
void handle_reacquire_lock(int r);
void release_acquire_lock();
void send_release_lock();
void handle_pre_release_lock(int r);
void handle_release_lock(int r);
void handle_post_release_lock(int r);
void send_shutdown();
void handle_shutdown(int r);
void send_shutdown_release();
void handle_shutdown_pre_release(int r);
void handle_shutdown_post_release(int r);
void wait_for_tracked_ops(int r);
void complete_shutdown(int r);
};
} // namespace librbd
extern template class librbd::ManagedLock<librbd::ImageCtx>;
#endif // CEPH_LIBRBD_MANAGED_LOCK_H
|
