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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_EXCLUSIVE_LOCK_H
#define CEPH_LIBRBD_EXCLUSIVE_LOCK_H
#include "common/AsyncOpTracker.h"
#include "librbd/ManagedLock.h"
#include "librbd/exclusive_lock/Policy.h"
#include "librbd/io/Types.h"
#include "common/RefCountedObj.h"
struct Context;
namespace librbd {
namespace exclusive_lock { template <typename> struct ImageDispatch; }
template <typename ImageCtxT = ImageCtx>
class ExclusiveLock : public RefCountedObject,
public ManagedLock<ImageCtxT> {
public:
static ExclusiveLock *create(ImageCtxT &image_ctx) {
return new ExclusiveLock<ImageCtxT>(image_ctx);
}
ExclusiveLock(ImageCtxT &image_ctx);
bool accept_request(exclusive_lock::OperationRequestType request_type,
int *ret_val) const;
bool accept_ops() const;
void set_require_lock(bool init_shutdown, io::Direction direction,
Context* on_finish);
void unset_require_lock(io::Direction direction);
void block_requests(int r);
void unblock_requests();
void init(uint64_t features, Context *on_init);
void shut_down(Context *on_shutdown);
void handle_peer_notification(int r);
int get_unlocked_op_error() const;
Context *start_op(int* ret_val);
protected:
void shutdown_handler(int r, Context *on_finish) override;
void pre_acquire_lock_handler(Context *on_finish) override;
void post_acquire_lock_handler(int r, Context *on_finish) override;
void pre_release_lock_handler(bool shutting_down,
Context *on_finish) override;
void post_release_lock_handler(bool shutting_down, int r,
Context *on_finish) override;
void post_reacquire_lock_handler(int r, Context *on_finish) override;
private:
/**
* @verbatim
*
* <start> * * > WAITING_FOR_REGISTER --------\
* | * (watch not registered) |
* | * |
* | * * > WAITING_FOR_PEER ------------\
* | * (request_lock busy) |
* | * |
* | * * * * * * * * * * * * * * |
* | * |
* v (init) (try_lock/request_lock) * |
* UNINITIALIZED -------> UNLOCKED ------------------------> ACQUIRING <--/
* ^ |
* | v
* RELEASING POST_ACQUIRING
* | |
* | |
* | (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
*/
ImageCtxT& m_image_ctx;
exclusive_lock::ImageDispatch<ImageCtxT>* m_image_dispatch = nullptr;
Context *m_pre_post_callback = nullptr;
AsyncOpTracker m_async_op_tracker;
uint32_t m_request_blocked_count = 0;
int m_request_blocked_ret_val = 0;
int m_acquire_lock_peer_ret_val = 0;
bool accept_ops(const ceph::mutex &lock) const;
void handle_post_acquiring_lock(int r);
void handle_post_acquired_lock(int r);
};
} // namespace librbd
#endif // CEPH_LIBRBD_EXCLUSIVE_LOCK_H
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