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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 "common/zipkin_trace.h"
#include "librbd/io/Types.h"
#include "librbd/io/ReadResult.h"
#include <boost/variant/variant.hpp>
namespace librbd {
class ImageCtx;
namespace io {
class AioCompletion;
template <typename ImageCtxT = ImageCtx>
class ImageDispatchSpec {
public:
struct Read {
ReadResult read_result;
Read(ReadResult &&read_result) : read_result(std::move(read_result)) {
}
};
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) {
}
};
static ImageDispatchSpec* create_read_request(
ImageCtxT &image_ctx, AioCompletion *aio_comp, Extents &&image_extents,
ReadResult &&read_result, int op_flags,
const ZTracer::Trace &parent_trace) {
return new ImageDispatchSpec(image_ctx, aio_comp,
std::move(image_extents),
Read{std::move(read_result)},
op_flags, parent_trace);
}
static ImageDispatchSpec* create_discard_request(
ImageCtxT &image_ctx, AioCompletion *aio_comp, uint64_t off, uint64_t len,
uint32_t discard_granularity_bytes, const ZTracer::Trace &parent_trace) {
return new ImageDispatchSpec(image_ctx, aio_comp, {{off, len}},
Discard{discard_granularity_bytes},
0, parent_trace);
}
static ImageDispatchSpec* create_write_request(
ImageCtxT &image_ctx, AioCompletion *aio_comp, Extents &&image_extents,
bufferlist &&bl, int op_flags, const ZTracer::Trace &parent_trace) {
return new ImageDispatchSpec(image_ctx, aio_comp, std::move(image_extents),
Write{std::move(bl)}, op_flags, parent_trace);
}
static ImageDispatchSpec* create_write_same_request(
ImageCtxT &image_ctx, AioCompletion *aio_comp, uint64_t off, uint64_t len,
bufferlist &&bl, int op_flags, const ZTracer::Trace &parent_trace) {
return new ImageDispatchSpec(image_ctx, aio_comp, {{off, len}},
WriteSame{std::move(bl)}, op_flags,
parent_trace);
}
static ImageDispatchSpec* create_compare_and_write_request(
ImageCtxT &image_ctx, AioCompletion *aio_comp, Extents &&image_extents,
bufferlist &&cmp_bl, bufferlist &&bl, uint64_t *mismatch_offset,
int op_flags, const ZTracer::Trace &parent_trace) {
return new ImageDispatchSpec(image_ctx, aio_comp,
std::move(image_extents),
CompareAndWrite{std::move(cmp_bl),
std::move(bl),
mismatch_offset},
op_flags, parent_trace);
}
static ImageDispatchSpec* create_flush_request(
ImageCtxT &image_ctx, AioCompletion *aio_comp,
FlushSource flush_source, const ZTracer::Trace &parent_trace) {
return new ImageDispatchSpec(image_ctx, aio_comp, {}, Flush{flush_source},
0, parent_trace);
}
void send();
void fail(int r);
bool is_write_op() const;
void start_op();
bool tokens_requested(uint64_t flag, uint64_t *tokens);
bool was_throttled(uint64_t flag) {
return m_throttled_flag & flag;
}
void set_throttled(uint64_t flag) {
m_throttled_flag |= flag;
}
bool were_all_throttled() {
return (m_throttled_flag & RBD_QOS_MASK) == RBD_QOS_MASK;
}
private:
typedef boost::variant<Read,
Discard,
Write,
WriteSame,
CompareAndWrite,
Flush> Request;
struct SendVisitor;
struct IsWriteOpVisitor;
struct TokenRequestedVisitor;
ImageDispatchSpec(ImageCtxT& image_ctx, AioCompletion* aio_comp,
Extents&& image_extents, Request&& request,
int op_flags, const ZTracer::Trace& parent_trace)
: m_image_ctx(image_ctx), m_aio_comp(aio_comp),
m_image_extents(std::move(image_extents)), m_request(std::move(request)),
m_op_flags(op_flags), m_parent_trace(parent_trace) {
}
ImageCtxT& m_image_ctx;
AioCompletion* m_aio_comp;
Extents m_image_extents;
Request m_request;
int m_op_flags;
ZTracer::Trace m_parent_trace;
std::atomic<uint64_t> m_throttled_flag = 0;
uint64_t extents_length();
};
} // namespace io
} // namespace librbd
extern template class librbd::io::ImageDispatchSpec<librbd::ImageCtx>;
#endif // CEPH_LIBRBD_IO_IMAGE_DISPATCH_SPEC_H
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