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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_WRITE_AROUND_OBJECT_DISPATCH_H
#define CEPH_LIBRBD_CACHE_WRITE_AROUND_OBJECT_DISPATCH_H
#include "librbd/io/ObjectDispatchInterface.h"
#include "include/interval_set.h"
#include "common/ceph_mutex.h"
#include "librbd/io/Types.h"
#include <map>
#include <set>
#include <string>
struct Context;
namespace librbd {
struct ImageCtx;
namespace cache {
template <typename ImageCtxT = ImageCtx>
class WriteAroundObjectDispatch : public io::ObjectDispatchInterface {
public:
static WriteAroundObjectDispatch* create(ImageCtxT* image_ctx,
size_t max_dirty,
bool writethrough_until_flush) {
return new WriteAroundObjectDispatch(image_ctx, max_dirty,
writethrough_until_flush);
}
WriteAroundObjectDispatch(ImageCtxT* image_ctx, size_t max_dirty,
bool writethrough_until_flush);
~WriteAroundObjectDispatch() override;
io::ObjectDispatchLayer get_dispatch_layer() const override {
return io::OBJECT_DISPATCH_LAYER_CACHE;
}
void init();
void shut_down(Context* on_finish) override;
bool read(
uint64_t object_no, io::ReadExtents* extents, IOContext io_context,
int op_flags, int read_flags, const ZTracer::Trace &parent_trace,
uint64_t* version, int* object_dispatch_flags,
io::DispatchResult* dispatch_result, Context** on_finish,
Context* on_dispatched) override;
bool discard(
uint64_t object_no, uint64_t object_off, uint64_t object_len,
IOContext io_context, 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(
uint64_t object_no, uint64_t object_off, ceph::bufferlist&& data,
IOContext io_context, int op_flags, int write_flags,
std::optional<uint64_t> assert_version,
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(
uint64_t object_no, uint64_t object_off, uint64_t object_len,
io::LightweightBufferExtents&& buffer_extents, ceph::bufferlist&& data,
IOContext io_context, 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(
uint64_t object_no, uint64_t object_off, ceph::bufferlist&& cmp_data,
ceph::bufferlist&& write_data, IOContext io_context, 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,
uint64_t* journal_tid, io::DispatchResult* dispatch_result,
Context** on_finish, Context* on_dispatched) override;
bool list_snaps(
uint64_t object_no, io::Extents&& extents, io::SnapIds&& snap_ids,
int list_snap_flags, const ZTracer::Trace &parent_trace,
io::SnapshotDelta* snapshot_delta, int* object_dispatch_flags,
io::DispatchResult* dispatch_result, Context** on_finish,
Context* on_dispatched) override {
return false;
}
bool invalidate_cache(Context* on_finish) override {
return false;
}
bool reset_existence_cache(Context* on_finish) override {
return false;
}
void extent_overwritten(
uint64_t object_no, uint64_t object_off, uint64_t object_len,
uint64_t journal_tid, uint64_t new_journal_tid) override {
}
int prepare_copyup(
uint64_t object_no,
io::SnapshotSparseBufferlist* snapshot_sparse_bufferlist) override {
return 0;
}
private:
struct QueuedIO {
QueuedIO(uint64_t length, Context* on_finish, Context* on_dispatched)
: length(length), on_finish(on_finish), on_dispatched(on_dispatched) {
}
uint64_t length;
Context* on_finish;
Context* on_dispatched;
};
struct QueuedFlush {
QueuedFlush(Context* on_finish, Context* on_dispatched)
: on_finish(on_finish), on_dispatched(on_dispatched) {
}
Context* on_finish;
Context* on_dispatched;
};
struct BlockedIO : public QueuedIO {
BlockedIO(uint64_t offset, uint64_t length, Context* on_finish,
Context* on_dispatched)
: QueuedIO(length, on_finish, on_dispatched), offset(offset) {
}
uint64_t offset;
};
typedef std::map<uint64_t, QueuedIO> QueuedIOs;
typedef std::map<uint64_t, QueuedFlush> QueuedFlushes;
typedef std::map<uint64_t, BlockedIO> BlockedObjectIOs;
typedef std::map<uint64_t, BlockedObjectIOs> BlockedIOs;
typedef std::map<uint64_t, Context*> Contexts;
typedef std::set<uint64_t> Tids;
typedef interval_set<uint64_t> InFlightObjectExtents;
typedef std::map<uint64_t, InFlightObjectExtents> InFlightExtents;
ImageCtxT* m_image_ctx;
size_t m_init_max_dirty;
size_t m_max_dirty;
ceph::mutex m_lock;
bool m_user_flushed = false;
uint64_t m_last_tid = 0;
uint64_t m_in_flight_bytes = 0;
Tids m_in_flight_io_tids;
InFlightExtents m_in_flight_extents;
BlockedIOs m_blocked_ios;
QueuedIOs m_queued_ios;
Tids m_queued_or_blocked_io_tids;
BlockedIOs m_blocked_unoptimized_ios;
QueuedFlushes m_queued_flushes;
Contexts m_in_flight_flushes;
Contexts m_pending_flushes;
int m_pending_flush_error = 0;
bool dispatch_unoptimized_io(uint64_t object_no, uint64_t object_off,
uint64_t object_len,
io::DispatchResult* dispatch_result,
Context* on_dispatched);
bool dispatch_io(uint64_t object_no, uint64_t object_off,
uint64_t object_len, int op_flags,
io::DispatchResult* dispatch_result, Context** on_finish,
Context* on_dispatch);
bool block_overlapping_io(InFlightObjectExtents* in_flight_object_extents,
uint64_t object_off, uint64_t object_len);
void unblock_overlapping_ios(uint64_t object_no, uint64_t object_off,
uint64_t object_len,
Contexts* unoptimized_io_dispatches);
bool can_dispatch_io(uint64_t tid, uint64_t length);
void handle_in_flight_io_complete(int r, uint64_t tid, uint64_t object_no,
uint64_t object_off, uint64_t object_len);
void handle_in_flight_flush_complete(int r, uint64_t tid);
QueuedIOs collect_ready_ios();
Contexts collect_ready_flushes();
Contexts collect_finished_flushes();
};
} // namespace cache
} // namespace librbd
extern template class librbd::cache::WriteAroundObjectDispatch<librbd::ImageCtx>;
#endif // CEPH_LIBRBD_CACHE_WRITE_AROUND_OBJECT_DISPATCH_H
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