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// -*- 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
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