--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_UTILS_H
+#define CEPH_LIBRBD_UTILS_H
+
+#include "include/rados/librados.hpp"
+#include "include/rbd_types.h"
+#include "include/Context.h"
+#include "common/zipkin_trace.h"
+
+#include <atomic>
+#include <type_traits>
+
+namespace librbd {
+
+class ImageCtx;
+
+namespace util {
+
+namespace detail {
+
+template <typename T>
+void rados_callback(rados_completion_t c, void *arg) {
+ reinterpret_cast<T*>(arg)->complete(rados_aio_get_return_value(c));
+}
+
+template <typename T, void(T::*MF)(int)>
+void rados_callback(rados_completion_t c, void *arg) {
+ T *obj = reinterpret_cast<T*>(arg);
+ int r = rados_aio_get_return_value(c);
+ (obj->*MF)(r);
+}
+
+template <typename T, Context*(T::*MF)(int*), bool destroy>
+void rados_state_callback(rados_completion_t c, void *arg) {
+ T *obj = reinterpret_cast<T*>(arg);
+ int r = rados_aio_get_return_value(c);
+ Context *on_finish = (obj->*MF)(&r);
+ if (on_finish != nullptr) {
+ on_finish->complete(r);
+ if (destroy) {
+ delete obj;
+ }
+ }
+}
+
+template <typename T, void (T::*MF)(int)>
+class C_CallbackAdapter : public Context {
+ T *obj;
+public:
+ C_CallbackAdapter(T *obj) : obj(obj) {
+ }
+
+protected:
+ void finish(int r) override {
+ (obj->*MF)(r);
+ }
+};
+
+template <typename T, Context*(T::*MF)(int*), bool destroy>
+class C_StateCallbackAdapter : public Context {
+ T *obj;
+public:
+ C_StateCallbackAdapter(T *obj) : obj(obj){
+ }
+
+protected:
+ void complete(int r) override {
+ Context *on_finish = (obj->*MF)(&r);
+ if (on_finish != nullptr) {
+ on_finish->complete(r);
+ if (destroy) {
+ delete obj;
+ }
+ }
+ Context::complete(r);
+ }
+ void finish(int r) override {
+ }
+};
+
+template <typename WQ>
+struct C_AsyncCallback : public Context {
+ WQ *op_work_queue;
+ Context *on_finish;
+
+ C_AsyncCallback(WQ *op_work_queue, Context *on_finish)
+ : op_work_queue(op_work_queue), on_finish(on_finish) {
+ }
+ void finish(int r) override {
+ op_work_queue->queue(on_finish, r);
+ }
+};
+
+} // namespace detail
+
+std::string generate_image_id(librados::IoCtx &ioctx);
+
+template <typename T>
+inline std::string generate_image_id(librados::IoCtx &ioctx) {
+ return generate_image_id(ioctx);
+}
+
+const std::string group_header_name(const std::string &group_id);
+const std::string id_obj_name(const std::string &name);
+const std::string header_name(const std::string &image_id);
+const std::string old_header_name(const std::string &image_name);
+std::string unique_lock_name(const std::string &name, void *address);
+
+librados::AioCompletion *create_rados_callback(Context *on_finish);
+
+template <typename T>
+librados::AioCompletion *create_rados_callback(T *obj) {
+ return librados::Rados::aio_create_completion(
+ obj, &detail::rados_callback<T>, nullptr);
+}
+
+template <typename T, void(T::*MF)(int)>
+librados::AioCompletion *create_rados_callback(T *obj) {
+ return librados::Rados::aio_create_completion(
+ obj, &detail::rados_callback<T, MF>, nullptr);
+}
+
+template <typename T, Context*(T::*MF)(int*), bool destroy=true>
+librados::AioCompletion *create_rados_callback(T *obj) {
+ return librados::Rados::aio_create_completion(
+ obj, &detail::rados_state_callback<T, MF, destroy>, nullptr);
+}
+
+template <typename T, void(T::*MF)(int) = &T::complete>
+Context *create_context_callback(T *obj) {
+ return new detail::C_CallbackAdapter<T, MF>(obj);
+}
+
+template <typename T, Context*(T::*MF)(int*), bool destroy=true>
+Context *create_context_callback(T *obj) {
+ return new detail::C_StateCallbackAdapter<T, MF, destroy>(obj);
+}
+
+template <typename I>
+Context *create_async_context_callback(I &image_ctx, Context *on_finish) {
+ // use async callback to acquire a clean lock context
+ return new detail::C_AsyncCallback<
+ typename std::decay<decltype(*image_ctx.op_work_queue)>::type>(
+ image_ctx.op_work_queue, on_finish);
+}
+
+template <typename WQ>
+Context *create_async_context_callback(WQ *work_queue, Context *on_finish) {
+ // use async callback to acquire a clean lock context
+ return new detail::C_AsyncCallback<WQ>(work_queue, on_finish);
+}
+
+// TODO: temporary until AioCompletion supports templated ImageCtx
+inline ImageCtx *get_image_ctx(ImageCtx *image_ctx) {
+ return image_ctx;
+}
+
+/// helper for tracking in-flight async ops when coordinating
+/// a shut down of the invoking class instance
+class AsyncOpTracker {
+public:
+ void start_op() {
+ m_refs++;
+ }
+
+ void finish_op() {
+ if (--m_refs == 0 && m_on_finish != nullptr) {
+ Context *on_finish = nullptr;
+ std::swap(on_finish, m_on_finish);
+ on_finish->complete(0);
+ }
+ }
+
+ template <typename I>
+ void wait(I &image_ctx, Context *on_finish) {
+ assert(m_on_finish == nullptr);
+
+ on_finish = create_async_context_callback(image_ctx, on_finish);
+ if (m_refs == 0) {
+ on_finish->complete(0);
+ return;
+ }
+ m_on_finish = on_finish;
+ }
+
+private:
+ std::atomic<uint64_t> m_refs = { 0 };
+ Context *m_on_finish = nullptr;
+};
+
+uint64_t get_rbd_default_features(CephContext* cct);
+
+bool calc_sparse_extent(const bufferptr &bp,
+ size_t sparse_size,
+ uint64_t length,
+ size_t *write_offset,
+ size_t *write_length,
+ size_t *offset);
+
+template <typename I>
+inline ZTracer::Trace create_trace(const I &image_ctx, const char *trace_name,
+ const ZTracer::Trace &parent_trace) {
+ if (parent_trace.valid()) {
+ return ZTracer::Trace(trace_name, &image_ctx.trace_endpoint, &parent_trace);
+ }
+ return ZTracer::Trace();
+}
+
+} // namespace util
+
+} // namespace librbd
+
+#endif // CEPH_LIBRBD_UTILS_H
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