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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_IMAGE_DISPATCH_SPEC_H
#define CEPH_LIBRBD_IO_IMAGE_DISPATCH_SPEC_H
#include "include/int_types.h"
#include "include/buffer.h"
#include "include/Context.h"
#include "common/zipkin_trace.h"
#include "librbd/io/AioCompletion.h"
#include "librbd/io/Types.h"
#include "librbd/io/ReadResult.h"
#include <boost/variant/variant.hpp>
#include <atomic>
namespace librbd {
class ImageCtx;
namespace io {
struct ImageDispatcherInterface;
class ImageDispatchSpec {
private:
// helper to avoid extra heap allocation per object IO
struct C_Dispatcher : public Context {
ImageDispatchSpec* image_dispatch_spec;
C_Dispatcher(ImageDispatchSpec* image_dispatch_spec)
: image_dispatch_spec(image_dispatch_spec) {
}
void complete(int r) override;
void finish(int r) override;
};
public:
struct Read {
ReadResult read_result;
int read_flags;
Read(ReadResult &&read_result, int read_flags)
: read_result(std::move(read_result)), read_flags(read_flags) {
}
};
struct Discard {
uint32_t discard_granularity_bytes;
Discard(uint32_t discard_granularity_bytes)
: discard_granularity_bytes(discard_granularity_bytes) {
}
};
struct Write {
bufferlist bl;
Write(bufferlist&& bl) : bl(std::move(bl)) {
}
};
struct WriteSame {
bufferlist bl;
WriteSame(bufferlist&& bl) : bl(std::move(bl)) {
}
};
struct CompareAndWrite {
bufferlist cmp_bl;
bufferlist bl;
uint64_t *mismatch_offset;
CompareAndWrite(bufferlist&& cmp_bl, bufferlist&& bl,
uint64_t *mismatch_offset)
: cmp_bl(std::move(cmp_bl)), bl(std::move(bl)),
mismatch_offset(mismatch_offset) {
}
};
struct Flush {
FlushSource flush_source;
Flush(FlushSource flush_source) : flush_source(flush_source) {
}
};
struct ListSnaps {
SnapIds snap_ids;
int list_snaps_flags;
SnapshotDelta* snapshot_delta;
ListSnaps(SnapIds&& snap_ids, int list_snaps_flags,
SnapshotDelta* snapshot_delta)
: snap_ids(std::move(snap_ids)), list_snaps_flags(list_snaps_flags),
snapshot_delta(snapshot_delta) {
}
};
typedef boost::variant<Read,
Discard,
Write,
WriteSame,
CompareAndWrite,
Flush,
ListSnaps> Request;
C_Dispatcher dispatcher_ctx;
ImageDispatcherInterface* image_dispatcher;
ImageDispatchLayer dispatch_layer;
std::atomic<uint32_t> image_dispatch_flags = 0;
DispatchResult dispatch_result = DISPATCH_RESULT_INVALID;
AioCompletion* aio_comp;
Extents image_extents;
Request request;
IOContext io_context;
int op_flags;
ZTracer::Trace parent_trace;
uint64_t tid = 0;
template <typename ImageCtxT = ImageCtx>
static ImageDispatchSpec* create_read(
ImageCtxT &image_ctx, ImageDispatchLayer image_dispatch_layer,
AioCompletion *aio_comp, Extents &&image_extents, ImageArea area,
ReadResult &&read_result, IOContext io_context, int op_flags,
int read_flags, const ZTracer::Trace &parent_trace) {
return new ImageDispatchSpec(image_ctx.io_image_dispatcher,
image_dispatch_layer, aio_comp,
std::move(image_extents), area,
Read{std::move(read_result), read_flags},
io_context, op_flags, parent_trace);
}
template <typename ImageCtxT = ImageCtx>
static ImageDispatchSpec* create_discard(
ImageCtxT &image_ctx, ImageDispatchLayer image_dispatch_layer,
AioCompletion *aio_comp, Extents &&image_extents, ImageArea area,
uint32_t discard_granularity_bytes, const ZTracer::Trace &parent_trace) {
return new ImageDispatchSpec(image_ctx.io_image_dispatcher,
image_dispatch_layer, aio_comp,
std::move(image_extents), area,
Discard{discard_granularity_bytes},
{}, 0, parent_trace);
}
template <typename ImageCtxT = ImageCtx>
static ImageDispatchSpec* create_write(
ImageCtxT &image_ctx, ImageDispatchLayer image_dispatch_layer,
AioCompletion *aio_comp, Extents &&image_extents, ImageArea area,
bufferlist &&bl, int op_flags, const ZTracer::Trace &parent_trace) {
return new ImageDispatchSpec(image_ctx.io_image_dispatcher,
image_dispatch_layer, aio_comp,
std::move(image_extents), area,
Write{std::move(bl)},
{}, op_flags, parent_trace);
}
template <typename ImageCtxT = ImageCtx>
static ImageDispatchSpec* create_write_same(
ImageCtxT &image_ctx, ImageDispatchLayer image_dispatch_layer,
AioCompletion *aio_comp, Extents &&image_extents, ImageArea area,
bufferlist &&bl, int op_flags, const ZTracer::Trace &parent_trace) {
return new ImageDispatchSpec(image_ctx.io_image_dispatcher,
image_dispatch_layer, aio_comp,
std::move(image_extents), area,
WriteSame{std::move(bl)},
{}, op_flags, parent_trace);
}
template <typename ImageCtxT = ImageCtx>
static ImageDispatchSpec* create_compare_and_write(
ImageCtxT &image_ctx, ImageDispatchLayer image_dispatch_layer,
AioCompletion *aio_comp, Extents &&image_extents, ImageArea area,
bufferlist &&cmp_bl, bufferlist &&bl, uint64_t *mismatch_offset,
int op_flags, const ZTracer::Trace &parent_trace) {
return new ImageDispatchSpec(image_ctx.io_image_dispatcher,
image_dispatch_layer, aio_comp,
std::move(image_extents), area,
CompareAndWrite{std::move(cmp_bl),
std::move(bl),
mismatch_offset},
{}, op_flags, parent_trace);
}
template <typename ImageCtxT = ImageCtx>
static ImageDispatchSpec* create_flush(
ImageCtxT &image_ctx, ImageDispatchLayer image_dispatch_layer,
AioCompletion *aio_comp, FlushSource flush_source,
const ZTracer::Trace &parent_trace) {
return new ImageDispatchSpec(image_ctx.io_image_dispatcher,
image_dispatch_layer, aio_comp, {},
ImageArea::DATA /* dummy for {} */,
Flush{flush_source}, {}, 0, parent_trace);
}
template <typename ImageCtxT = ImageCtx>
static ImageDispatchSpec* create_list_snaps(
ImageCtxT &image_ctx, ImageDispatchLayer image_dispatch_layer,
AioCompletion *aio_comp, Extents &&image_extents, ImageArea area,
SnapIds&& snap_ids, int list_snaps_flags, SnapshotDelta* snapshot_delta,
const ZTracer::Trace &parent_trace) {
return new ImageDispatchSpec(image_ctx.io_image_dispatcher,
image_dispatch_layer, aio_comp,
std::move(image_extents), area,
ListSnaps{std::move(snap_ids),
list_snaps_flags, snapshot_delta},
{}, 0, parent_trace);
}
~ImageDispatchSpec() {
aio_comp->put();
}
void send();
void fail(int r);
private:
struct SendVisitor;
struct IsWriteOpVisitor;
struct TokenRequestedVisitor;
ImageDispatchSpec(ImageDispatcherInterface* image_dispatcher,
ImageDispatchLayer image_dispatch_layer,
AioCompletion* aio_comp, Extents&& image_extents,
ImageArea area, Request&& request, IOContext io_context,
int op_flags, const ZTracer::Trace& parent_trace)
: dispatcher_ctx(this), image_dispatcher(image_dispatcher),
dispatch_layer(image_dispatch_layer), aio_comp(aio_comp),
image_extents(std::move(image_extents)), request(std::move(request)),
io_context(io_context), op_flags(op_flags), parent_trace(parent_trace) {
ceph_assert(aio_comp->image_dispatcher_ctx == nullptr);
aio_comp->image_dispatcher_ctx = &dispatcher_ctx;
aio_comp->get();
switch (area) {
case ImageArea::DATA:
break;
case ImageArea::CRYPTO_HEADER:
image_dispatch_flags |= IMAGE_DISPATCH_FLAG_CRYPTO_HEADER;
break;
default:
ceph_abort();
}
}
};
} // namespace io
} // namespace librbd
#endif // CEPH_LIBRBD_IO_IMAGE_DISPATCH_SPEC_H
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