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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_READ_RESULT_H
#define CEPH_LIBRBD_IO_READ_RESULT_H
#include "include/common_fwd.h"
#include "include/int_types.h"
#include "include/buffer_fwd.h"
#include "include/Context.h"
#include "librbd/io/Types.h"
#include "osdc/Striper.h"
#include <sys/uio.h>
#include <boost/variant/variant.hpp>
namespace librbd {
struct ImageCtx;
namespace io {
struct AioCompletion;
template <typename> struct ObjectReadRequest;
class ReadResult {
public:
struct C_ImageReadRequest : public Context {
AioCompletion *aio_completion;
uint64_t buffer_offset = 0;
Extents image_extents;
bufferlist bl;
bool ignore_enoent = false;
C_ImageReadRequest(AioCompletion *aio_completion,
uint64_t buffer_offset,
const Extents image_extents);
void finish(int r) override;
};
struct C_ObjectReadRequest : public Context {
AioCompletion *aio_completion;
ReadExtents extents;
C_ObjectReadRequest(AioCompletion *aio_completion, ReadExtents&& extents);
void finish(int r) override;
};
struct C_ObjectReadMergedExtents : public Context {
CephContext* cct;
ReadExtents* extents;
Context *on_finish;
bufferlist bl;
C_ObjectReadMergedExtents(CephContext* cct, ReadExtents* extents,
Context* on_finish);
void finish(int r) override;
};
ReadResult();
ReadResult(char *buf, size_t buf_len);
ReadResult(const struct iovec *iov, int iov_count);
ReadResult(ceph::bufferlist *bl);
ReadResult(Extents* extent_map, ceph::bufferlist* bl);
void set_image_extents(const Extents& image_extents);
void assemble_result(CephContext *cct);
private:
struct Empty {
};
struct Linear {
char *buf;
size_t buf_len;
Linear(char *buf, size_t buf_len) : buf(buf), buf_len(buf_len) {
}
};
struct Vector {
const struct iovec *iov;
int iov_count;
Vector(const struct iovec *iov, int iov_count)
: iov(iov), iov_count(iov_count) {
}
};
struct Bufferlist {
ceph::bufferlist *bl;
Bufferlist(ceph::bufferlist *bl) : bl(bl) {
}
};
struct SparseBufferlist {
Extents *extent_map;
ceph::bufferlist *bl;
Extents image_extents;
SparseBufferlist(Extents* extent_map, ceph::bufferlist* bl)
: extent_map(extent_map), bl(bl) {
}
};
typedef boost::variant<Empty,
Linear,
Vector,
Bufferlist,
SparseBufferlist> Buffer;
struct SetImageExtentsVisitor;
struct AssembleResultVisitor;
Buffer m_buffer;
Striper::StripedReadResult m_destriper;
};
} // namespace io
} // namespace librbd
#endif // CEPH_LIBRBD_IO_READ_RESULT_H
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