--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/ImageState.h"
+#include "include/rbd/librbd.hpp"
+#include "common/dout.h"
+#include "common/errno.h"
+#include "common/Cond.h"
+#include "common/WorkQueue.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/Utils.h"
+#include "librbd/image/CloseRequest.h"
+#include "librbd/image/OpenRequest.h"
+#include "librbd/image/RefreshRequest.h"
+#include "librbd/image/SetSnapRequest.h"
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::ImageState: " << this << " "
+
+namespace librbd {
+
+using util::create_async_context_callback;
+using util::create_context_callback;
+
+class ImageUpdateWatchers {
+public:
+
+ ImageUpdateWatchers(CephContext *cct) : m_cct(cct),
+ m_lock(util::unique_lock_name("librbd::ImageUpdateWatchers::m_lock", this)) {
+ }
+
+ ~ImageUpdateWatchers() {
+ assert(m_watchers.empty());
+ assert(m_in_flight.empty());
+ assert(m_pending_unregister.empty());
+ assert(m_on_shut_down_finish == nullptr);
+
+ destroy_work_queue();
+ }
+
+ void flush(Context *on_finish) {
+ ldout(m_cct, 20) << "ImageUpdateWatchers::" << __func__ << dendl;
+ {
+ Mutex::Locker locker(m_lock);
+ if (!m_in_flight.empty()) {
+ Context *ctx = new FunctionContext(
+ [this, on_finish](int r) {
+ ldout(m_cct, 20) << "ImageUpdateWatchers::" << __func__
+ << ": completing flush" << dendl;
+ on_finish->complete(r);
+ });
+ m_work_queue->queue(ctx, 0);
+ return;
+ }
+ }
+ ldout(m_cct, 20) << "ImageUpdateWatchers::" << __func__
+ << ": completing flush" << dendl;
+ on_finish->complete(0);
+ }
+
+ void shut_down(Context *on_finish) {
+ ldout(m_cct, 20) << "ImageUpdateWatchers::" << __func__ << dendl;
+ {
+ Mutex::Locker locker(m_lock);
+ assert(m_on_shut_down_finish == nullptr);
+ m_watchers.clear();
+ if (!m_in_flight.empty()) {
+ m_on_shut_down_finish = on_finish;
+ return;
+ }
+ }
+ ldout(m_cct, 20) << "ImageUpdateWatchers::" << __func__
+ << ": completing shut down" << dendl;
+ on_finish->complete(0);
+ }
+
+ void register_watcher(UpdateWatchCtx *watcher, uint64_t *handle) {
+ ldout(m_cct, 20) << __func__ << ": watcher=" << watcher << dendl;
+
+ Mutex::Locker locker(m_lock);
+ assert(m_on_shut_down_finish == nullptr);
+
+ create_work_queue();
+
+ *handle = m_next_handle++;
+ m_watchers.insert(std::make_pair(*handle, watcher));
+ }
+
+ void unregister_watcher(uint64_t handle, Context *on_finish) {
+ ldout(m_cct, 20) << "ImageUpdateWatchers::" << __func__ << ": handle="
+ << handle << dendl;
+ int r = 0;
+ {
+ Mutex::Locker locker(m_lock);
+ auto it = m_watchers.find(handle);
+ if (it == m_watchers.end()) {
+ r = -ENOENT;
+ } else {
+ if (m_in_flight.find(handle) != m_in_flight.end()) {
+ assert(m_pending_unregister.find(handle) == m_pending_unregister.end());
+ m_pending_unregister[handle] = on_finish;
+ on_finish = nullptr;
+ }
+ m_watchers.erase(it);
+ }
+ }
+
+ if (on_finish) {
+ ldout(m_cct, 20) << "ImageUpdateWatchers::" << __func__
+ << ": completing unregister" << dendl;
+ on_finish->complete(r);
+ }
+ }
+
+ void notify() {
+ ldout(m_cct, 20) << "ImageUpdateWatchers::" << __func__ << dendl;
+
+ Mutex::Locker locker(m_lock);
+ for (auto it : m_watchers) {
+ send_notify(it.first, it.second);
+ }
+ }
+
+ void send_notify(uint64_t handle, UpdateWatchCtx *watcher) {
+ assert(m_lock.is_locked());
+
+ ldout(m_cct, 20) << "ImageUpdateWatchers::" << __func__ << ": handle="
+ << handle << ", watcher=" << watcher << dendl;
+
+ m_in_flight.insert(handle);
+
+ Context *ctx = new FunctionContext(
+ [this, handle, watcher](int r) {
+ handle_notify(handle, watcher);
+ });
+
+ m_work_queue->queue(ctx, 0);
+ }
+
+ void handle_notify(uint64_t handle, UpdateWatchCtx *watcher) {
+
+ ldout(m_cct, 20) << "ImageUpdateWatchers::" << __func__ << ": handle="
+ << handle << ", watcher=" << watcher << dendl;
+
+ watcher->handle_notify();
+
+ Context *on_unregister_finish = nullptr;
+ Context *on_shut_down_finish = nullptr;
+
+ {
+ Mutex::Locker locker(m_lock);
+
+ auto in_flight_it = m_in_flight.find(handle);
+ assert(in_flight_it != m_in_flight.end());
+ m_in_flight.erase(in_flight_it);
+
+ // If there is no more in flight notifications for this watcher
+ // and it is pending unregister, complete it now.
+ if (m_in_flight.find(handle) == m_in_flight.end()) {
+ auto it = m_pending_unregister.find(handle);
+ if (it != m_pending_unregister.end()) {
+ on_unregister_finish = it->second;
+ m_pending_unregister.erase(it);
+ }
+ }
+
+ if (m_in_flight.empty()) {
+ assert(m_pending_unregister.empty());
+ if (m_on_shut_down_finish != nullptr) {
+ std::swap(m_on_shut_down_finish, on_shut_down_finish);
+ }
+ }
+ }
+
+ if (on_unregister_finish != nullptr) {
+ ldout(m_cct, 20) << "ImageUpdateWatchers::" << __func__
+ << ": completing unregister" << dendl;
+ on_unregister_finish->complete(0);
+ }
+
+ if (on_shut_down_finish != nullptr) {
+ ldout(m_cct, 20) << "ImageUpdateWatchers::" << __func__
+ << ": completing shut down" << dendl;
+ on_shut_down_finish->complete(0);
+ }
+ }
+
+private:
+ class ThreadPoolSingleton : public ThreadPool {
+ public:
+ explicit ThreadPoolSingleton(CephContext *cct)
+ : ThreadPool(cct, "librbd::ImageUpdateWatchers::thread_pool", "tp_librbd",
+ 1) {
+ start();
+ }
+ ~ThreadPoolSingleton() override {
+ stop();
+ }
+ };
+
+ CephContext *m_cct;
+ Mutex m_lock;
+ ContextWQ *m_work_queue = nullptr;
+ std::map<uint64_t, UpdateWatchCtx*> m_watchers;
+ uint64_t m_next_handle = 0;
+ std::multiset<uint64_t> m_in_flight;
+ std::map<uint64_t, Context*> m_pending_unregister;
+ Context *m_on_shut_down_finish = nullptr;
+
+ void create_work_queue() {
+ if (m_work_queue != nullptr) {
+ return;
+ }
+ ThreadPoolSingleton *thread_pool_singleton;
+ m_cct->lookup_or_create_singleton_object<ThreadPoolSingleton>(
+ thread_pool_singleton, "librbd::ImageUpdateWatchers::thread_pool");
+ m_work_queue = new ContextWQ("librbd::ImageUpdateWatchers::op_work_queue",
+ m_cct->_conf->get_val<int64_t>("rbd_op_thread_timeout"),
+ thread_pool_singleton);
+ }
+
+ void destroy_work_queue() {
+ if (m_work_queue == nullptr) {
+ return;
+ }
+ m_work_queue->drain();
+ delete m_work_queue;
+ }
+};
+
+template <typename I>
+ImageState<I>::ImageState(I *image_ctx)
+ : m_image_ctx(image_ctx), m_state(STATE_UNINITIALIZED),
+ m_lock(util::unique_lock_name("librbd::ImageState::m_lock", this)),
+ m_last_refresh(0), m_refresh_seq(0),
+ m_update_watchers(new ImageUpdateWatchers(image_ctx->cct)),
+ m_skip_open_parent_image(false) {
+}
+
+template <typename I>
+ImageState<I>::~ImageState() {
+ assert(m_state == STATE_UNINITIALIZED || m_state == STATE_CLOSED);
+ delete m_update_watchers;
+}
+
+template <typename I>
+int ImageState<I>::open(bool skip_open_parent) {
+ C_SaferCond ctx;
+ open(skip_open_parent, &ctx);
+
+ int r = ctx.wait();
+ if (r < 0) {
+ delete m_image_ctx;
+ }
+ return r;
+}
+
+template <typename I>
+void ImageState<I>::open(bool skip_open_parent, Context *on_finish) {
+ CephContext *cct = m_image_ctx->cct;
+ ldout(cct, 20) << __func__ << dendl;
+
+ m_lock.Lock();
+ assert(m_state == STATE_UNINITIALIZED);
+ m_skip_open_parent_image = skip_open_parent;
+
+ Action action(ACTION_TYPE_OPEN);
+ action.refresh_seq = m_refresh_seq;
+
+ execute_action_unlock(action, on_finish);
+}
+
+template <typename I>
+int ImageState<I>::close() {
+ C_SaferCond ctx;
+ close(&ctx);
+
+ int r = ctx.wait();
+ delete m_image_ctx;
+ return r;
+}
+
+template <typename I>
+void ImageState<I>::close(Context *on_finish) {
+ CephContext *cct = m_image_ctx->cct;
+ ldout(cct, 20) << __func__ << dendl;
+
+ m_lock.Lock();
+ assert(!is_closed());
+
+ Action action(ACTION_TYPE_CLOSE);
+ action.refresh_seq = m_refresh_seq;
+ execute_action_unlock(action, on_finish);
+}
+
+template <typename I>
+void ImageState<I>::handle_update_notification() {
+ Mutex::Locker locker(m_lock);
+ ++m_refresh_seq;
+
+ CephContext *cct = m_image_ctx->cct;
+ ldout(cct, 20) << __func__ << ": refresh_seq = " << m_refresh_seq << ", "
+ << "last_refresh = " << m_last_refresh << dendl;
+
+ if (m_state == STATE_OPEN) {
+ m_update_watchers->notify();
+ }
+}
+
+template <typename I>
+bool ImageState<I>::is_refresh_required() const {
+ Mutex::Locker locker(m_lock);
+ return (m_last_refresh != m_refresh_seq || find_pending_refresh() != nullptr);
+}
+
+template <typename I>
+int ImageState<I>::refresh() {
+ C_SaferCond refresh_ctx;
+ refresh(&refresh_ctx);
+ return refresh_ctx.wait();
+}
+
+template <typename I>
+void ImageState<I>::refresh(Context *on_finish) {
+ CephContext *cct = m_image_ctx->cct;
+ ldout(cct, 20) << __func__ << dendl;
+
+ m_lock.Lock();
+ if (is_closed()) {
+ m_lock.Unlock();
+ on_finish->complete(-ESHUTDOWN);
+ return;
+ }
+
+ Action action(ACTION_TYPE_REFRESH);
+ action.refresh_seq = m_refresh_seq;
+ execute_action_unlock(action, on_finish);
+}
+
+template <typename I>
+int ImageState<I>::refresh_if_required() {
+ C_SaferCond ctx;
+ {
+ m_lock.Lock();
+ Action action(ACTION_TYPE_REFRESH);
+ action.refresh_seq = m_refresh_seq;
+
+ auto refresh_action = find_pending_refresh();
+ if (refresh_action != nullptr) {
+ // if a refresh is in-flight, delay until it is finished
+ action = *refresh_action;
+ } else if (m_last_refresh == m_refresh_seq) {
+ m_lock.Unlock();
+ return 0;
+ } else if (is_closed()) {
+ m_lock.Unlock();
+ return -ESHUTDOWN;
+ }
+
+ execute_action_unlock(action, &ctx);
+ }
+
+ return ctx.wait();
+}
+
+template <typename I>
+const typename ImageState<I>::Action *
+ImageState<I>::find_pending_refresh() const {
+ assert(m_lock.is_locked());
+
+ auto it = std::find_if(m_actions_contexts.rbegin(),
+ m_actions_contexts.rend(),
+ [](const ActionContexts& action_contexts) {
+ return (action_contexts.first == ACTION_TYPE_REFRESH);
+ });
+ if (it != m_actions_contexts.rend()) {
+ return &it->first;
+ }
+ return nullptr;
+}
+
+template <typename I>
+void ImageState<I>::snap_set(const cls::rbd::SnapshotNamespace &snap_namespace,
+ const std::string &snap_name,
+ Context *on_finish) {
+ CephContext *cct = m_image_ctx->cct;
+ ldout(cct, 20) << __func__ << ": snap_name=" << snap_name << dendl;
+
+ Action action(ACTION_TYPE_SET_SNAP);
+ action.snap_namespace = snap_namespace;
+ action.snap_name = snap_name;
+
+ m_lock.Lock();
+ execute_action_unlock(action, on_finish);
+}
+
+template <typename I>
+void ImageState<I>::prepare_lock(Context *on_ready) {
+ CephContext *cct = m_image_ctx->cct;
+ ldout(cct, 10) << __func__ << dendl;
+
+ m_lock.Lock();
+ if (is_closed()) {
+ m_lock.Unlock();
+ on_ready->complete(-ESHUTDOWN);
+ return;
+ }
+
+ Action action(ACTION_TYPE_LOCK);
+ action.on_ready = on_ready;
+ execute_action_unlock(action, nullptr);
+}
+
+template <typename I>
+void ImageState<I>::handle_prepare_lock_complete() {
+ CephContext *cct = m_image_ctx->cct;
+ ldout(cct, 10) << __func__ << dendl;
+
+ m_lock.Lock();
+ if (m_state != STATE_PREPARING_LOCK) {
+ m_lock.Unlock();
+ return;
+ }
+
+ complete_action_unlock(STATE_OPEN, 0);
+}
+
+template <typename I>
+int ImageState<I>::register_update_watcher(UpdateWatchCtx *watcher,
+ uint64_t *handle) {
+ CephContext *cct = m_image_ctx->cct;
+ ldout(cct, 20) << __func__ << dendl;
+
+ m_update_watchers->register_watcher(watcher, handle);
+
+ ldout(cct, 20) << __func__ << ": handle=" << *handle << dendl;
+ return 0;
+}
+
+template <typename I>
+int ImageState<I>::unregister_update_watcher(uint64_t handle) {
+ CephContext *cct = m_image_ctx->cct;
+ ldout(cct, 20) << __func__ << ": handle=" << handle << dendl;
+
+ C_SaferCond ctx;
+ m_update_watchers->unregister_watcher(handle, &ctx);
+ return ctx.wait();
+}
+
+template <typename I>
+void ImageState<I>::flush_update_watchers(Context *on_finish) {
+ CephContext *cct = m_image_ctx->cct;
+ ldout(cct, 20) << __func__ << dendl;
+
+ m_update_watchers->flush(on_finish);
+}
+
+template <typename I>
+void ImageState<I>::shut_down_update_watchers(Context *on_finish) {
+ CephContext *cct = m_image_ctx->cct;
+ ldout(cct, 20) << __func__ << dendl;
+
+ m_update_watchers->shut_down(on_finish);
+}
+
+template <typename I>
+bool ImageState<I>::is_transition_state() const {
+ switch (m_state) {
+ case STATE_UNINITIALIZED:
+ case STATE_OPEN:
+ case STATE_CLOSED:
+ return false;
+ case STATE_OPENING:
+ case STATE_CLOSING:
+ case STATE_REFRESHING:
+ case STATE_SETTING_SNAP:
+ case STATE_PREPARING_LOCK:
+ break;
+ }
+ return true;
+}
+
+template <typename I>
+bool ImageState<I>::is_closed() const {
+ assert(m_lock.is_locked());
+
+ return ((m_state == STATE_CLOSED) ||
+ (!m_actions_contexts.empty() &&
+ m_actions_contexts.back().first.action_type == ACTION_TYPE_CLOSE));
+}
+
+template <typename I>
+void ImageState<I>::append_context(const Action &action, Context *context) {
+ assert(m_lock.is_locked());
+
+ ActionContexts *action_contexts = nullptr;
+ for (auto &action_ctxs : m_actions_contexts) {
+ if (action == action_ctxs.first) {
+ action_contexts = &action_ctxs;
+ break;
+ }
+ }
+
+ if (action_contexts == nullptr) {
+ m_actions_contexts.push_back({action, {}});
+ action_contexts = &m_actions_contexts.back();
+ }
+
+ if (context != nullptr) {
+ action_contexts->second.push_back(context);
+ }
+}
+
+template <typename I>
+void ImageState<I>::execute_next_action_unlock() {
+ assert(m_lock.is_locked());
+ assert(!m_actions_contexts.empty());
+ switch (m_actions_contexts.front().first.action_type) {
+ case ACTION_TYPE_OPEN:
+ send_open_unlock();
+ return;
+ case ACTION_TYPE_CLOSE:
+ send_close_unlock();
+ return;
+ case ACTION_TYPE_REFRESH:
+ send_refresh_unlock();
+ return;
+ case ACTION_TYPE_SET_SNAP:
+ send_set_snap_unlock();
+ return;
+ case ACTION_TYPE_LOCK:
+ send_prepare_lock_unlock();
+ return;
+ }
+ assert(false);
+}
+
+template <typename I>
+void ImageState<I>::execute_action_unlock(const Action &action,
+ Context *on_finish) {
+ assert(m_lock.is_locked());
+
+ append_context(action, on_finish);
+ if (!is_transition_state()) {
+ execute_next_action_unlock();
+ } else {
+ m_lock.Unlock();
+ }
+}
+
+template <typename I>
+void ImageState<I>::complete_action_unlock(State next_state, int r) {
+ assert(m_lock.is_locked());
+ assert(!m_actions_contexts.empty());
+
+ ActionContexts action_contexts(std::move(m_actions_contexts.front()));
+ m_actions_contexts.pop_front();
+
+ m_state = next_state;
+ m_lock.Unlock();
+
+ for (auto ctx : action_contexts.second) {
+ ctx->complete(r);
+ }
+
+ if (next_state != STATE_UNINITIALIZED && next_state != STATE_CLOSED) {
+ m_lock.Lock();
+ if (!is_transition_state() && !m_actions_contexts.empty()) {
+ execute_next_action_unlock();
+ } else {
+ m_lock.Unlock();
+ }
+ }
+}
+
+template <typename I>
+void ImageState<I>::send_open_unlock() {
+ assert(m_lock.is_locked());
+ CephContext *cct = m_image_ctx->cct;
+ ldout(cct, 10) << this << " " << __func__ << dendl;
+
+ m_state = STATE_OPENING;
+
+ Context *ctx = create_async_context_callback(
+ *m_image_ctx, create_context_callback<
+ ImageState<I>, &ImageState<I>::handle_open>(this));
+ image::OpenRequest<I> *req = image::OpenRequest<I>::create(
+ m_image_ctx, m_skip_open_parent_image, ctx);
+
+ m_lock.Unlock();
+ req->send();
+}
+
+template <typename I>
+void ImageState<I>::handle_open(int r) {
+ CephContext *cct = m_image_ctx->cct;
+ ldout(cct, 10) << this << " " << __func__ << ": r=" << r << dendl;
+
+ if (r < 0 && r != -ENOENT) {
+ lderr(cct) << "failed to open image: " << cpp_strerror(r) << dendl;
+ }
+
+ m_lock.Lock();
+ complete_action_unlock(r < 0 ? STATE_UNINITIALIZED : STATE_OPEN, r);
+}
+
+template <typename I>
+void ImageState<I>::send_close_unlock() {
+ assert(m_lock.is_locked());
+ CephContext *cct = m_image_ctx->cct;
+ ldout(cct, 10) << this << " " << __func__ << dendl;
+
+ m_state = STATE_CLOSING;
+
+ Context *ctx = create_context_callback<
+ ImageState<I>, &ImageState<I>::handle_close>(this);
+ image::CloseRequest<I> *req = image::CloseRequest<I>::create(
+ m_image_ctx, ctx);
+
+ m_lock.Unlock();
+ req->send();
+}
+
+template <typename I>
+void ImageState<I>::handle_close(int r) {
+ CephContext *cct = m_image_ctx->cct;
+ ldout(cct, 10) << this << " " << __func__ << ": r=" << r << dendl;
+
+ if (r < 0) {
+ lderr(cct) << "error occurred while closing image: " << cpp_strerror(r)
+ << dendl;
+ }
+
+ m_lock.Lock();
+ complete_action_unlock(STATE_CLOSED, r);
+}
+
+template <typename I>
+void ImageState<I>::send_refresh_unlock() {
+ assert(m_lock.is_locked());
+ CephContext *cct = m_image_ctx->cct;
+ ldout(cct, 10) << this << " " << __func__ << dendl;
+
+ m_state = STATE_REFRESHING;
+ assert(!m_actions_contexts.empty());
+ auto &action_context = m_actions_contexts.front().first;
+ assert(action_context.action_type == ACTION_TYPE_REFRESH);
+
+ Context *ctx = create_async_context_callback(
+ *m_image_ctx, create_context_callback<
+ ImageState<I>, &ImageState<I>::handle_refresh>(this));
+ image::RefreshRequest<I> *req = image::RefreshRequest<I>::create(
+ *m_image_ctx, false, false, ctx);
+
+ m_lock.Unlock();
+ req->send();
+}
+
+template <typename I>
+void ImageState<I>::handle_refresh(int r) {
+ CephContext *cct = m_image_ctx->cct;
+ ldout(cct, 10) << this << " " << __func__ << ": r=" << r << dendl;
+
+ m_lock.Lock();
+ assert(!m_actions_contexts.empty());
+
+ ActionContexts &action_contexts(m_actions_contexts.front());
+ assert(action_contexts.first.action_type == ACTION_TYPE_REFRESH);
+ assert(m_last_refresh <= action_contexts.first.refresh_seq);
+
+ if (r == -ERESTART) {
+ ldout(cct, 5) << "incomplete refresh: not updating sequence" << dendl;
+ r = 0;
+ } else {
+ m_last_refresh = action_contexts.first.refresh_seq;
+ }
+
+ complete_action_unlock(STATE_OPEN, r);
+}
+
+template <typename I>
+void ImageState<I>::send_set_snap_unlock() {
+ assert(m_lock.is_locked());
+
+ m_state = STATE_SETTING_SNAP;
+
+ assert(!m_actions_contexts.empty());
+ ActionContexts &action_contexts(m_actions_contexts.front());
+ assert(action_contexts.first.action_type == ACTION_TYPE_SET_SNAP);
+
+ CephContext *cct = m_image_ctx->cct;
+ ldout(cct, 10) << this << " " << __func__ << ": "
+ << "snap_name=" << action_contexts.first.snap_name << dendl;
+
+ Context *ctx = create_async_context_callback(
+ *m_image_ctx, create_context_callback<
+ ImageState<I>, &ImageState<I>::handle_set_snap>(this));
+ image::SetSnapRequest<I> *req = image::SetSnapRequest<I>::create(
+ *m_image_ctx, action_contexts.first.snap_namespace, action_contexts.first.snap_name, ctx);
+
+ m_lock.Unlock();
+ req->send();
+}
+
+template <typename I>
+void ImageState<I>::handle_set_snap(int r) {
+ CephContext *cct = m_image_ctx->cct;
+ ldout(cct, 10) << this << " " << __func__ << " r=" << r << dendl;
+
+ if (r < 0 && r != -ENOENT) {
+ lderr(cct) << "failed to set snapshot: " << cpp_strerror(r) << dendl;
+ }
+
+ m_lock.Lock();
+ complete_action_unlock(STATE_OPEN, r);
+}
+
+template <typename I>
+void ImageState<I>::send_prepare_lock_unlock() {
+ CephContext *cct = m_image_ctx->cct;
+ ldout(cct, 10) << this << " " << __func__ << dendl;
+
+ assert(m_lock.is_locked());
+ m_state = STATE_PREPARING_LOCK;
+
+ assert(!m_actions_contexts.empty());
+ ActionContexts &action_contexts(m_actions_contexts.front());
+ assert(action_contexts.first.action_type == ACTION_TYPE_LOCK);
+
+ Context *on_ready = action_contexts.first.on_ready;
+ m_lock.Unlock();
+
+ if (on_ready == nullptr) {
+ complete_action_unlock(STATE_OPEN, 0);
+ return;
+ }
+
+ // wake up the lock handler now that its safe to proceed
+ on_ready->complete(0);
+}
+
+} // namespace librbd
+
+template class librbd::ImageState<librbd::ImageCtx>;
Code Review / stor4nfv.git / blobdiff