101 lines
2.2 KiB
C++
101 lines
2.2 KiB
C++
#ifndef CACHE_MAPPING_ARRAY_H
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#define CACHE_MAPPING_ARRAY_H
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#include "persistent-data/data-structures/array.h"
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//----------------------------------------------------------------
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namespace caching {
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enum mapping_flags {
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M_VALID = 1,
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M_DIRTY = 2
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};
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struct mapping {
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uint64_t oblock_;
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uint32_t flags_;
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};
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struct mapping_traits {
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typedef base::le64 disk_type;
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typedef mapping value_type;
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typedef no_op_ref_counter<value_type> ref_counter;
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static void unpack(disk_type const &disk, value_type &value);
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static void pack(value_type const &value, disk_type &disk);
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};
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namespace mapping_array_damage {
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class damage_visitor;
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class damage {
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public:
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damage(std::string const &desc)
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: desc_(desc) {
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}
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virtual ~damage() {}
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virtual void visit(damage_visitor &v) const = 0;
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std::string get_desc() const {
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return desc_;
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}
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private:
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std::string desc_;
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};
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struct missing_mappings : public damage {
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missing_mappings(std::string const &desc, run<uint32_t> const &keys);
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virtual void visit(damage_visitor &v) const;
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run<uint32_t> keys_;
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};
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struct invalid_mapping : public damage {
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invalid_mapping(std::string const &desc, block_address cblock, mapping const &m);
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virtual void visit(damage_visitor &v) const;
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block_address cblock_;
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mapping m_;
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};
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class damage_visitor {
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public:
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virtual ~damage_visitor() {}
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void visit(mapping_array_damage::damage const &d) {
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d.visit(*this);
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}
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virtual void visit(missing_mappings const &d) = 0;
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virtual void visit(invalid_mapping const &d) = 0;
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};
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}
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typedef persistent_data::array<mapping_traits> mapping_array;
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class mapping_visitor {
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public:
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virtual ~mapping_visitor() {}
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void visit(uint32_t index, mapping const &m) {
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visit(static_cast<block_address>(index), m);
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}
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virtual void visit(block_address cblock, mapping const &m) = 0;
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};
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void walk_mapping_array(mapping_array const &array,
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mapping_visitor &mv,
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mapping_array_damage::damage_visitor &dv);
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void check_mapping_array(mapping_array const &array,
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mapping_array_damage::damage_visitor &visitor,
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unsigned metadata_version);
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}
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//----------------------------------------------------------------
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#endif
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