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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_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) {
ceph_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();
}
bool is_metadata_config_override(const std::string& metadata_key,
std::string* config_key);
int create_ioctx(librados::IoCtx& src_io_ctx, const std::string& pool_desc,
int64_t pool_id,
const std::optional<std::string>& pool_namespace,
librados::IoCtx* dst_io_ctx);
} // namespace util
} // namespace librbd
#endif // CEPH_LIBRBD_UTILS_H
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