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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_IO_OBJECT_DISPATCH_SPEC_H
+#define CEPH_LIBRBD_IO_OBJECT_DISPATCH_SPEC_H
+
+#include "include/int_types.h"
+#include "include/buffer.h"
+#include "include/Context.h"
+#include "include/rados/librados.hpp"
+#include "common/snap_types.h"
+#include "common/zipkin_trace.h"
+#include "librbd/io/Types.h"
+#include <boost/variant/variant.hpp>
+
+namespace librbd {
+namespace io {
+
+struct ObjectDispatcherInterface;
+
+struct ObjectDispatchSpec {
+private:
+ // helper to avoid extra heap allocation per object IO
+ struct C_Dispatcher : public Context {
+ ObjectDispatchSpec* object_dispatch_spec;
+ Context* on_finish;
+
+ C_Dispatcher(ObjectDispatchSpec* object_dispatch_spec, Context* on_finish)
+ : object_dispatch_spec(object_dispatch_spec), on_finish(on_finish) {
+ }
+
+ void complete(int r) override;
+ void finish(int r) override;
+ };
+
+public:
+ struct RequestBase {
+ std::string oid;
+ uint64_t object_no;
+ uint64_t object_off;
+
+ RequestBase(const std::string& oid, uint64_t object_no, uint64_t object_off)
+ : oid(oid), object_no(object_no), object_off(object_off) {
+ }
+ };
+
+ struct ReadRequest : public RequestBase {
+ uint64_t object_len;
+ librados::snap_t snap_id;
+ ceph::bufferlist* read_data;
+ ExtentMap* extent_map;
+
+ ReadRequest(const std::string& oid, uint64_t object_no, uint64_t object_off,
+ uint64_t object_len, librados::snap_t snap_id,
+ ceph::bufferlist* read_data, ExtentMap* extent_map)
+ : RequestBase(oid, object_no, object_off),
+ object_len(object_len), snap_id(snap_id), read_data(read_data),
+ extent_map(extent_map) {
+ }
+ };
+
+ struct WriteRequestBase : public RequestBase {
+ ::SnapContext snapc;
+ uint64_t journal_tid;
+
+ WriteRequestBase(const std::string& oid, uint64_t object_no,
+ uint64_t object_off, const ::SnapContext& snapc,
+ uint64_t journal_tid)
+ : RequestBase(oid, object_no, object_off), snapc(snapc),
+ journal_tid(journal_tid) {
+ }
+ };
+
+ struct DiscardRequest : public WriteRequestBase {
+ uint64_t object_len;
+ int discard_flags;
+
+ DiscardRequest(const std::string& oid, uint64_t object_no,
+ uint64_t object_off, uint64_t object_len,
+ int discard_flags, const ::SnapContext& snapc,
+ uint64_t journal_tid)
+ : WriteRequestBase(oid, object_no, object_off, snapc, journal_tid),
+ object_len(object_len), discard_flags(discard_flags) {
+ }
+ };
+
+ struct WriteRequest : public WriteRequestBase {
+ ceph::bufferlist data;
+
+ WriteRequest(const std::string& oid, uint64_t object_no,
+ uint64_t object_off, ceph::bufferlist&& data,
+ const ::SnapContext& snapc, uint64_t journal_tid)
+ : WriteRequestBase(oid, object_no, object_off, snapc, journal_tid),
+ data(std::move(data)) {
+ }
+ };
+
+ struct WriteSameRequest : public WriteRequestBase {
+ uint64_t object_len;
+ Extents buffer_extents;
+ ceph::bufferlist data;
+
+ WriteSameRequest(const std::string& oid, uint64_t object_no,
+ uint64_t object_off, uint64_t object_len,
+ Extents&& buffer_extents, ceph::bufferlist&& data,
+ const ::SnapContext& snapc, uint64_t journal_tid)
+ : WriteRequestBase(oid, object_no, object_off, snapc, journal_tid),
+ object_len(object_len), buffer_extents(std::move(buffer_extents)),
+ data(std::move(data)) {
+ }
+ };
+
+ struct CompareAndWriteRequest : public WriteRequestBase {
+ ceph::bufferlist cmp_data;
+ ceph::bufferlist data;
+ uint64_t* mismatch_offset;
+
+ CompareAndWriteRequest(const std::string& oid, uint64_t object_no,
+ uint64_t object_off, ceph::bufferlist&& cmp_data,
+ ceph::bufferlist&& data, uint64_t* mismatch_offset,
+ const ::SnapContext& snapc, uint64_t journal_tid)
+ : WriteRequestBase(oid, object_no, object_off, snapc, journal_tid),
+ cmp_data(std::move(cmp_data)), data(std::move(data)),
+ mismatch_offset(mismatch_offset) {
+ }
+ };
+
+ struct FlushRequest {
+ FlushSource flush_source;
+
+ FlushRequest(FlushSource flush_source) : flush_source(flush_source) {
+ }
+ };
+
+ typedef boost::variant<ReadRequest,
+ DiscardRequest,
+ WriteRequest,
+ WriteSameRequest,
+ CompareAndWriteRequest,
+ FlushRequest> Request;
+
+ C_Dispatcher dispatcher_ctx;
+
+ ObjectDispatcherInterface* object_dispatcher;
+ ObjectDispatchLayer object_dispatch_layer;
+ int object_dispatch_flags = 0;
+ DispatchResult dispatch_result = DISPATCH_RESULT_INVALID;
+
+ Request request;
+ int op_flags;
+ ZTracer::Trace parent_trace;
+
+ template <typename ImageCtxT>
+ static ObjectDispatchSpec* create_read(
+ ImageCtxT* image_ctx, ObjectDispatchLayer object_dispatch_layer,
+ 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,
+ ExtentMap* extent_map, Context* on_finish) {
+ return new ObjectDispatchSpec(image_ctx->io_object_dispatcher,
+ object_dispatch_layer,
+ ReadRequest{oid, object_no, object_off,
+ object_len, snap_id, read_data,
+ extent_map},
+ op_flags, parent_trace, on_finish);
+ }
+
+ template <typename ImageCtxT>
+ static ObjectDispatchSpec* create_discard(
+ ImageCtxT* image_ctx, ObjectDispatchLayer object_dispatch_layer,
+ const std::string &oid, uint64_t object_no, uint64_t object_off,
+ uint64_t object_len, const ::SnapContext &snapc, int discard_flags,
+ uint64_t journal_tid, const ZTracer::Trace &parent_trace,
+ Context *on_finish) {
+ return new ObjectDispatchSpec(image_ctx->io_object_dispatcher,
+ object_dispatch_layer,
+ DiscardRequest{oid, object_no, object_off,
+ object_len, discard_flags,
+ snapc, journal_tid},
+ 0, parent_trace, on_finish);
+ }
+
+ template <typename ImageCtxT>
+ static ObjectDispatchSpec* create_write(
+ ImageCtxT* image_ctx, ObjectDispatchLayer object_dispatch_layer,
+ const std::string &oid, uint64_t object_no, uint64_t object_off,
+ ceph::bufferlist&& data, const ::SnapContext &snapc, int op_flags,
+ uint64_t journal_tid, const ZTracer::Trace &parent_trace,
+ Context *on_finish) {
+ return new ObjectDispatchSpec(image_ctx->io_object_dispatcher,
+ object_dispatch_layer,
+ WriteRequest{oid, object_no, object_off,
+ std::move(data), snapc,
+ journal_tid},
+ op_flags, parent_trace, on_finish);
+ }
+
+ template <typename ImageCtxT>
+ static ObjectDispatchSpec* create_write_same(
+ ImageCtxT* image_ctx, ObjectDispatchLayer object_dispatch_layer,
+ const std::string &oid, uint64_t object_no, uint64_t object_off,
+ uint64_t object_len, Extents&& buffer_extents,
+ ceph::bufferlist&& data, const ::SnapContext &snapc, int op_flags,
+ uint64_t journal_tid, const ZTracer::Trace &parent_trace,
+ Context *on_finish) {
+ return new ObjectDispatchSpec(image_ctx->io_object_dispatcher,
+ object_dispatch_layer,
+ WriteSameRequest{oid, object_no, object_off,
+ object_len,
+ std::move(buffer_extents),
+ std::move(data), snapc,
+ journal_tid},
+ op_flags, parent_trace, on_finish);
+ }
+
+ template <typename ImageCtxT>
+ static ObjectDispatchSpec* create_compare_and_write(
+ ImageCtxT* image_ctx, ObjectDispatchLayer object_dispatch_layer,
+ const std::string &oid, uint64_t object_no, uint64_t object_off,
+ ceph::bufferlist&& cmp_data, ceph::bufferlist&& write_data,
+ const ::SnapContext &snapc, uint64_t *mismatch_offset, int op_flags,
+ uint64_t journal_tid, const ZTracer::Trace &parent_trace,
+ Context *on_finish) {
+ return new ObjectDispatchSpec(image_ctx->io_object_dispatcher,
+ object_dispatch_layer,
+ CompareAndWriteRequest{oid, object_no,
+ object_off,
+ std::move(cmp_data),
+ std::move(write_data),
+ mismatch_offset,
+ snapc, journal_tid},
+ op_flags, parent_trace, on_finish);
+ }
+
+ template <typename ImageCtxT>
+ static ObjectDispatchSpec* create_flush(
+ ImageCtxT* image_ctx, ObjectDispatchLayer object_dispatch_layer,
+ FlushSource flush_source, const ZTracer::Trace &parent_trace,
+ Context *on_finish) {
+ return new ObjectDispatchSpec(image_ctx->io_object_dispatcher,
+ object_dispatch_layer,
+ FlushRequest{flush_source}, 0,
+ parent_trace, on_finish);
+ }
+
+ void send();
+ void fail(int r);
+
+private:
+ template <typename> friend class ObjectDispatcher;
+
+ ObjectDispatchSpec(ObjectDispatcherInterface* object_dispatcher,
+ ObjectDispatchLayer object_dispatch_layer,
+ Request&& request, int op_flags,
+ const ZTracer::Trace& parent_trace, Context* on_finish)
+ : dispatcher_ctx(this, on_finish), object_dispatcher(object_dispatcher),
+ object_dispatch_layer(object_dispatch_layer), request(std::move(request)),
+ op_flags(op_flags), parent_trace(parent_trace) {
+ }
+
+};
+
+} // namespace io
+} // namespace librbd
+
+#endif // CEPH_LIBRBD_IO_OBJECT_DISPATCH_SPEC_H
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 23:08:11 +0000