118 lines
2.3 KiB
C++
118 lines
2.3 KiB
C++
#ifndef BLOCK_CACHE_COPIER_H
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#define BLOCK_CACHE_COPIER_H
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#include "block-cache/io_engine.h"
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#include "block-cache/mem_pool.h"
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#include <string>
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#include <list>
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#include <map>
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//----------------------------------------------------------------
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namespace bcache {
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using block_address = uint64_t;
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struct copy_op {
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copy_op()
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: src_b(0),
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src_e(0),
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dest_b(0),
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read_complete(false),
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write_complete(false) {
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}
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copy_op(block_address src_b_,
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block_address src_e_,
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block_address dest_b_)
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: src_b(src_b_),
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src_e(src_e_),
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dest_b(dest_b_),
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read_complete(false),
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write_complete(false) {
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}
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bool operator <(copy_op const &rhs) const {
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return dest_b < rhs.dest_b;
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}
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bool success() const {
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return read_complete && write_complete;
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}
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block_address src_b, src_e;
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block_address dest_b;
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bool read_complete;
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bool write_complete;
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};
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class copy_job {
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public:
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copy_job(copy_op const &op_, void *data_)
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: op(op_), data(data_) {
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}
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copy_op op;
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void *data;
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};
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class copier {
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public:
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copier(io_engine &engine,
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std::string const &src, std::string const &dest,
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sector_t block_size, size_t mem,
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sector_t src_offset, sector_t dest_offset);
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~copier();
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sector_t get_block_size() const {
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return block_size_;
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}
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sector_t get_src_offset() const {
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return src_offset_;
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}
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sector_t get_dest_offset() const {
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return dest_offset_;
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}
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// Blocks if out of memory.
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void issue(copy_op const &op);
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unsigned nr_pending() const;
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boost::optional<copy_op> wait();
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boost::optional<copy_op> wait(unsigned µ);
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private:
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bool pending() const;
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bool wait_successful(io_engine::wait_result const &p);
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boost::optional<copy_op> wait_complete();
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void wait_(unsigned µ);
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void wait_();
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void complete(copy_job const &j);
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sector_t to_src_sector(block_address b) const;
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sector_t to_dest_sector(block_address b) const;
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unsigned genkey();
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mempool pool_;
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sector_t block_size_;
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io_engine &engine_;
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io_engine::handle src_handle_;
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io_engine::handle dest_handle_;
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sector_t src_offset_;
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sector_t dest_offset_;
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unsigned genkey_count_;
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using job_map = std::map<unsigned, copy_job>;
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using op_list = std::list<copy_op>;
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job_map jobs_;
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op_list complete_;
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};
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}
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//----------------------------------------------------------------
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#endif
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