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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_CACHE_OBJECT_CACHER_OBJECT_DISPATCH_H
#define CEPH_LIBRBD_CACHE_OBJECT_CACHER_OBJECT_DISPATCH_H
#include "librbd/io/ObjectDispatchInterface.h"
#include "common/Mutex.h"
#include "osdc/ObjectCacher.h"
struct WritebackHandler;
namespace librbd {
class ImageCtx;
namespace cache {
/**
* Facade around the OSDC object cacher to make it align with
* the object dispatcher interface
*/
template <typename ImageCtxT = ImageCtx>
class ObjectCacherObjectDispatch : public io::ObjectDispatchInterface {
public:
static ObjectCacherObjectDispatch* create(ImageCtxT* image_ctx) {
return new ObjectCacherObjectDispatch(image_ctx);
}
ObjectCacherObjectDispatch(ImageCtxT* image_ctx);
~ObjectCacherObjectDispatch() override;
io::ObjectDispatchLayer get_object_dispatch_layer() const override {
return io::OBJECT_DISPATCH_LAYER_CACHE;
}
void init();
void shut_down(Context* on_finish) override;
bool read(
const std::string &oid, uint64_t object_no, uint64_t object_off,
uint64_t object_len, librados::snap_t snap_id, int op_flags,
const ZTracer::Trace &parent_trace, ceph::bufferlist* read_data,
io::ExtentMap* extent_map, int* object_dispatch_flags,
io::DispatchResult* dispatch_result, Context** on_finish,
Context* on_dispatched) override;
bool discard(
const std::string &oid, uint64_t object_no, uint64_t object_off,
uint64_t object_len, const ::SnapContext &snapc, int discard_flags,
const ZTracer::Trace &parent_trace, int* object_dispatch_flags,
uint64_t* journal_tid, io::DispatchResult* dispatch_result,
Context** on_finish, Context* on_dispatched) override;
bool write(
const std::string &oid, uint64_t object_no, uint64_t object_off,
ceph::bufferlist&& data, const ::SnapContext &snapc, int op_flags,
const ZTracer::Trace &parent_trace, int* object_dispatch_flags,
uint64_t* journal_tid, io::DispatchResult* dispatch_result,
Context** on_finish, Context* on_dispatched) override;
bool write_same(
const std::string &oid, uint64_t object_no, uint64_t object_off,
uint64_t object_len, io::Extents&& buffer_extents,
ceph::bufferlist&& data, const ::SnapContext &snapc, int op_flags,
const ZTracer::Trace &parent_trace, int* object_dispatch_flags,
uint64_t* journal_tid, io::DispatchResult* dispatch_result,
Context** on_finish, Context* on_dispatched) override;
bool compare_and_write(
const std::string &oid, uint64_t object_no, uint64_t object_off,
ceph::bufferlist&& cmp_data, ceph::bufferlist&& write_data,
const ::SnapContext &snapc, int op_flags,
const ZTracer::Trace &parent_trace, uint64_t* mismatch_offset,
int* object_dispatch_flags, uint64_t* journal_tid,
io::DispatchResult* dispatch_result, Context** on_finish,
Context* on_dispatched) override;
bool flush(
io::FlushSource flush_source, const ZTracer::Trace &parent_trace,
io::DispatchResult* dispatch_result, Context** on_finish,
Context* on_dispatched) override;
bool invalidate_cache(Context* on_finish) override;
bool reset_existence_cache(Context* on_finish) override;
void extent_overwritten(
uint64_t object_no, uint64_t object_off, uint64_t object_len,
uint64_t journal_tid, uint64_t new_journal_tid) {
}
private:
struct C_InvalidateCache;
ImageCtxT* m_image_ctx;
Mutex m_cache_lock;
ObjectCacher *m_object_cacher = nullptr;
ObjectCacher::ObjectSet *m_object_set = nullptr;
WritebackHandler *m_writeback_handler = nullptr;
bool m_user_flushed = false;
};
} // namespace cache
} // namespace librbd
extern template class librbd::cache::ObjectCacherObjectDispatch<librbd::ImageCtx>;
#endif // CEPH_LIBRBD_CACHE_OBJECT_CACHER_OBJECT_DISPATCH_H
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