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ImageWatcher.h
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/
ImageWatcher.h
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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_IMAGE_WATCHER_H
#define CEPH_LIBRBD_IMAGE_WATCHER_H
#include "common/Mutex.h"
#include "common/RWLock.h"
#include "include/Context.h"
#include "include/rbd/librbd.hpp"
#include "librbd/image_watcher/Notifier.h"
#include "librbd/WatchNotifyTypes.h"
#include <set>
#include <string>
#include <utility>
#include <boost/variant.hpp>
class entity_name_t;
namespace librbd {
class ImageCtx;
template <typename T> class TaskFinisher;
class ImageWatcher {
public:
ImageWatcher(ImageCtx& image_ctx);
~ImageWatcher();
void register_watch(Context *on_finish);
void unregister_watch(Context *on_finish);
void flush(Context *on_finish);
void notify_flatten(uint64_t request_id, ProgressContext &prog_ctx,
Context *on_finish);
void notify_resize(uint64_t request_id, uint64_t size, bool allow_shrink,
ProgressContext &prog_ctx, Context *on_finish);
void notify_snap_create(const std::string &snap_name, Context *on_finish);
void notify_snap_rename(const snapid_t &src_snap_id,
const std::string &dst_snap_name,
Context *on_finish);
void notify_snap_remove(const std::string &snap_name, Context *on_finish);
void notify_snap_protect(const std::string &snap_name, Context *on_finish);
void notify_snap_unprotect(const std::string &snap_name, Context *on_finish);
void notify_rebuild_object_map(uint64_t request_id,
ProgressContext &prog_ctx, Context *on_finish);
void notify_rename(const std::string &image_name, Context *on_finish);
void notify_acquired_lock();
void notify_released_lock();
void notify_request_lock();
void notify_header_update(Context *on_finish);
static void notify_header_update(librados::IoCtx &io_ctx,
const std::string &oid);
uint64_t get_watch_handle() const {
RWLock::RLocker watch_locker(m_watch_lock);
return m_watch_handle;
}
private:
enum WatchState {
WATCH_STATE_UNREGISTERED,
WATCH_STATE_REGISTERED,
WATCH_STATE_ERROR
};
enum TaskCode {
TASK_CODE_REQUEST_LOCK,
TASK_CODE_CANCEL_ASYNC_REQUESTS,
TASK_CODE_REREGISTER_WATCH,
TASK_CODE_ASYNC_REQUEST,
TASK_CODE_ASYNC_PROGRESS
};
typedef std::pair<Context *, ProgressContext *> AsyncRequest;
class Task {
public:
Task(TaskCode task_code) : m_task_code(task_code) {}
Task(TaskCode task_code, const watch_notify::AsyncRequestId &id)
: m_task_code(task_code), m_async_request_id(id) {}
inline bool operator<(const Task& rhs) const {
if (m_task_code != rhs.m_task_code) {
return m_task_code < rhs.m_task_code;
} else if ((m_task_code == TASK_CODE_ASYNC_REQUEST ||
m_task_code == TASK_CODE_ASYNC_PROGRESS) &&
m_async_request_id != rhs.m_async_request_id) {
return m_async_request_id < rhs.m_async_request_id;
}
return false;
}
private:
TaskCode m_task_code;
watch_notify::AsyncRequestId m_async_request_id;
};
struct WatchCtx : public librados::WatchCtx2 {
ImageWatcher &image_watcher;
WatchCtx(ImageWatcher &parent) : image_watcher(parent) {}
virtual void handle_notify(uint64_t notify_id,
uint64_t handle,
uint64_t notifier_id,
bufferlist& bl);
virtual void handle_error(uint64_t handle, int err);
};
class RemoteProgressContext : public ProgressContext {
public:
RemoteProgressContext(ImageWatcher &image_watcher,
const watch_notify::AsyncRequestId &id)
: m_image_watcher(image_watcher), m_async_request_id(id)
{
}
virtual int update_progress(uint64_t offset, uint64_t total) {
m_image_watcher.schedule_async_progress(m_async_request_id, offset,
total);
return 0;
}
private:
ImageWatcher &m_image_watcher;
watch_notify::AsyncRequestId m_async_request_id;
};
class RemoteContext : public Context {
public:
RemoteContext(ImageWatcher &image_watcher,
const watch_notify::AsyncRequestId &id,
ProgressContext *prog_ctx)
: m_image_watcher(image_watcher), m_async_request_id(id),
m_prog_ctx(prog_ctx)
{
}
virtual ~RemoteContext() {
delete m_prog_ctx;
}
virtual void finish(int r);
private:
ImageWatcher &m_image_watcher;
watch_notify::AsyncRequestId m_async_request_id;
ProgressContext *m_prog_ctx;
};
struct C_RegisterWatch : public Context {
ImageWatcher *image_watcher;
Context *on_finish;
C_RegisterWatch(ImageWatcher *image_watcher, Context *on_finish)
: image_watcher(image_watcher), on_finish(on_finish) {
}
virtual void finish(int r) override {
image_watcher->handle_register_watch(r);
on_finish->complete(r);
}
};
struct C_NotifyAck : public Context {
ImageWatcher *image_watcher;
uint64_t notify_id;
uint64_t handle;
bufferlist out;
C_NotifyAck(ImageWatcher *image_watcher, uint64_t notify_id,
uint64_t handle);
virtual void finish(int r);
};
struct C_ResponseMessage : public Context {
C_NotifyAck *notify_ack;
C_ResponseMessage(C_NotifyAck *notify_ack) : notify_ack(notify_ack) {
}
virtual void finish(int r);
};
struct C_ProcessPayload : public Context {
ImageWatcher *image_watcher;
uint64_t notify_id;
uint64_t handle;
watch_notify::Payload payload;
C_ProcessPayload(ImageWatcher *image_watcher_, uint64_t notify_id_,
uint64_t handle_, const watch_notify::Payload &payload)
: image_watcher(image_watcher_), notify_id(notify_id_), handle(handle_),
payload(payload) {
}
virtual void finish(int r) override {
image_watcher->process_payload(notify_id, handle, payload, r);
}
};
struct HandlePayloadVisitor : public boost::static_visitor<void> {
ImageWatcher *image_watcher;
uint64_t notify_id;
uint64_t handle;
HandlePayloadVisitor(ImageWatcher *image_watcher_, uint64_t notify_id_,
uint64_t handle_)
: image_watcher(image_watcher_), notify_id(notify_id_), handle(handle_)
{
}
template <typename Payload>
inline void operator()(const Payload &payload) const {
C_NotifyAck *ctx = new C_NotifyAck(image_watcher, notify_id,
handle);
if (image_watcher->handle_payload(payload, ctx)) {
ctx->complete(0);
}
}
};
ImageCtx &m_image_ctx;
mutable RWLock m_watch_lock;
WatchCtx m_watch_ctx;
uint64_t m_watch_handle;
WatchState m_watch_state;
TaskFinisher<Task> *m_task_finisher;
RWLock m_async_request_lock;
std::map<watch_notify::AsyncRequestId, AsyncRequest> m_async_requests;
std::set<watch_notify::AsyncRequestId> m_async_pending;
Mutex m_owner_client_id_lock;
watch_notify::ClientId m_owner_client_id;
image_watcher::Notifier m_notifier;
void handle_register_watch(int r);
void schedule_cancel_async_requests();
void cancel_async_requests();
void set_owner_client_id(const watch_notify::ClientId &client_id);
watch_notify::ClientId get_client_id();
void handle_request_lock(int r);
void schedule_request_lock(bool use_timer, int timer_delay = -1);
void notify_lock_owner(bufferlist &&bl, Context *on_finish);
Context *remove_async_request(const watch_notify::AsyncRequestId &id);
void schedule_async_request_timed_out(const watch_notify::AsyncRequestId &id);
void async_request_timed_out(const watch_notify::AsyncRequestId &id);
void notify_async_request(const watch_notify::AsyncRequestId &id,
bufferlist &&in, ProgressContext& prog_ctx,
Context *on_finish);
void schedule_async_progress(const watch_notify::AsyncRequestId &id,
uint64_t offset, uint64_t total);
int notify_async_progress(const watch_notify::AsyncRequestId &id,
uint64_t offset, uint64_t total);
void schedule_async_complete(const watch_notify::AsyncRequestId &id, int r);
void notify_async_complete(const watch_notify::AsyncRequestId &id, int r);
void handle_async_complete(const watch_notify::AsyncRequestId &request, int r,
int ret_val);
int prepare_async_request(const watch_notify::AsyncRequestId& id,
bool* new_request, Context** ctx,
ProgressContext** prog_ctx);
bool handle_payload(const watch_notify::HeaderUpdatePayload& payload,
C_NotifyAck *ctx);
bool handle_payload(const watch_notify::AcquiredLockPayload& payload,
C_NotifyAck *ctx);
bool handle_payload(const watch_notify::ReleasedLockPayload& payload,
C_NotifyAck *ctx);
bool handle_payload(const watch_notify::RequestLockPayload& payload,
C_NotifyAck *ctx);
bool handle_payload(const watch_notify::AsyncProgressPayload& payload,
C_NotifyAck *ctx);
bool handle_payload(const watch_notify::AsyncCompletePayload& payload,
C_NotifyAck *ctx);
bool handle_payload(const watch_notify::FlattenPayload& payload,
C_NotifyAck *ctx);
bool handle_payload(const watch_notify::ResizePayload& payload,
C_NotifyAck *ctx);
bool handle_payload(const watch_notify::SnapCreatePayload& payload,
C_NotifyAck *ctx);
bool handle_payload(const watch_notify::SnapRenamePayload& payload,
C_NotifyAck *ctx);
bool handle_payload(const watch_notify::SnapRemovePayload& payload,
C_NotifyAck *ctx);
bool handle_payload(const watch_notify::SnapProtectPayload& payload,
C_NotifyAck *ctx);
bool handle_payload(const watch_notify::SnapUnprotectPayload& payload,
C_NotifyAck *ctx);
bool handle_payload(const watch_notify::RebuildObjectMapPayload& payload,
C_NotifyAck *ctx);
bool handle_payload(const watch_notify::RenamePayload& payload,
C_NotifyAck *ctx);
bool handle_payload(const watch_notify::UnknownPayload& payload,
C_NotifyAck *ctx);
void process_payload(uint64_t notify_id, uint64_t handle,
const watch_notify::Payload &payload, int r);
void handle_notify(uint64_t notify_id, uint64_t handle, bufferlist &bl);
void handle_error(uint64_t cookie, int err);
void acknowledge_notify(uint64_t notify_id, uint64_t handle, bufferlist &out);
void reregister_watch();
};
} // namespace librbd
#endif // CEPH_LIBRBD_IMAGE_WATCHER_H