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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_MIGRATION_QCOW_FORMAT_H
#define CEPH_LIBRBD_MIGRATION_QCOW_FORMAT_H
#include "include/int_types.h"
#include "librbd/Types.h"
#include "librbd/migration/FormatInterface.h"
#include "librbd/migration/QCOW.h"
#include "acconfig.h"
#include "json_spirit/json_spirit.h"
#include <boost/asio/io_context_strand.hpp>
#include <boost/iostreams/filter/zlib.hpp>
#include <deque>
#include <vector>
#include <memory>
struct Context;
namespace librbd {
struct AsioEngine;
struct ImageCtx;
namespace migration {
template <typename> struct SourceSpecBuilder;
struct StreamInterface;
namespace qcow_format {
struct LookupTable {
LookupTable() {}
LookupTable(uint32_t size) : size(size) {}
bufferlist bl;
uint64_t* cluster_offsets = nullptr;
uint32_t size = 0;
bool decoded = false;
void init();
void decode();
};
} // namespace qcow_format
template <typename ImageCtxT>
class QCOWFormat : public FormatInterface {
public:
static QCOWFormat* create(
ImageCtxT* image_ctx, const json_spirit::mObject& json_object,
const SourceSpecBuilder<ImageCtxT>* source_spec_builder) {
return new QCOWFormat(image_ctx, json_object, source_spec_builder);
}
QCOWFormat(ImageCtxT* image_ctx, const json_spirit::mObject& json_object,
const SourceSpecBuilder<ImageCtxT>* source_spec_builder);
QCOWFormat(const QCOWFormat&) = delete;
QCOWFormat& operator=(const QCOWFormat&) = delete;
void open(Context* on_finish) override;
void close(Context* on_finish) override;
void get_snapshots(SnapInfos* snap_infos, Context* on_finish) override;
void get_image_size(uint64_t snap_id, uint64_t* size,
Context* on_finish) override;
bool read(io::AioCompletion* aio_comp, uint64_t snap_id,
io::Extents&& image_extents, io::ReadResult&& read_result,
int op_flags, int read_flags,
const ZTracer::Trace &parent_trace) override;
void list_snaps(io::Extents&& image_extents, io::SnapIds&& snap_ids,
int list_snaps_flags, io::SnapshotDelta* snapshot_delta,
const ZTracer::Trace &parent_trace,
Context* on_finish) override;
private:
/**
* @verbatim
*
* <start>
* |
* v
* OPEN
* |
* v
* PROBE
* |
* |\---> READ V1 HEADER ----------\
* | |
* \----> READ V2 HEADER |
* | |
* | /----------\ |
* | | | |
* v v | |
* READ SNAPSHOT | |
* | | |
* v | |
* READ SNAPSHOT EXTRA | |
* | | |
* v | |
* READ SNAPSHOT L1 TABLE |
* | |
* \--------------------\|
* |
* v
* READ L1 TABLE
* |
* v
* READ BACKING FILE
* |
* /-------------------------------/
* |
* v
* <opened>
*
* @endverbatim
*/
struct Cluster;
struct ClusterCache;
struct L2TableCache;
struct ReadRequest;
struct ListSnapsRequest;
struct Snapshot {
std::string id;
std::string name;
utime_t timestamp;
uint64_t size = 0;
uint64_t l1_table_offset = 0;
qcow_format::LookupTable l1_table;
uint32_t extra_data_size = 0;
};
ImageCtxT* m_image_ctx;
json_spirit::mObject m_json_object;
const SourceSpecBuilder<ImageCtxT>* m_source_spec_builder;
boost::asio::io_context::strand m_strand;
std::shared_ptr<StreamInterface> m_stream;
bufferlist m_bl;
uint64_t m_size = 0;
uint64_t m_backing_file_offset = 0;
uint32_t m_backing_file_size = 0;
uint32_t m_cluster_bits = 0;
uint32_t m_cluster_size = 0;
uint64_t m_cluster_offset_mask = 0;
uint64_t m_cluster_mask = 0;
uint32_t m_l1_shift = 0;
uint64_t m_l1_table_offset = 0;
qcow_format::LookupTable m_l1_table;
uint32_t m_l2_bits = 0;
uint32_t m_l2_size = 0;
uint32_t m_snapshot_count = 0;
uint64_t m_snapshots_offset = 0;
std::map<uint64_t, Snapshot> m_snapshots;
std::unique_ptr<L2TableCache> m_l2_table_cache;
std::unique_ptr<ClusterCache> m_cluster_cache;
void handle_open(int r, Context* on_finish);
void probe(Context* on_finish);
void handle_probe(int r, Context* on_finish);
#ifdef WITH_RBD_MIGRATION_FORMAT_QCOW_V1
void read_v1_header(Context* on_finish);
void handle_read_v1_header(int r, Context* on_finish);
#endif // WITH_RBD_MIGRATION_FORMAT_QCOW_V1
void read_v2_header(Context* on_finish);
void handle_read_v2_header(int r, Context* on_finish);
void read_snapshot(Context* on_finish);
void handle_read_snapshot(int r, Context* on_finish);
void read_snapshot_extra(Context* on_finish);
void handle_read_snapshot_extra(int r, Context* on_finish);
void read_snapshot_l1_table(Context* on_finish);
void handle_read_snapshot_l1_table(int r, Context* on_finish);
void read_l1_table(Context* on_finish);
void handle_read_l1_table(int r, Context* on_finish);
void read_backing_file(Context* on_finish);
void handle_list_snaps(int r, io::Extents&& image_extents,
io::SnapIds&& snap_ids,
io::SnapshotDelta* snapshot_delta, Context* on_finish);
};
} // namespace migration
} // namespace librbd
extern template class librbd::migration::QCOWFormat<librbd::ImageCtx>;
#endif // CEPH_LIBRBD_MIGRATION_QCOW_FORMAT_H
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