136 lines
2.9 KiB
C++
136 lines
2.9 KiB
C++
#ifndef ERA_SUPERBLOCK_H
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#define ERA_SUPERBLOCK_H
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#include "persistent-data/block.h"
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#include "era/era_detail.h"
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#include <boost/optional.hpp>
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#include <set>
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//----------------------------------------------------------------
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namespace era {
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typedef unsigned char __u8;
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class superblock_flags {
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public:
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enum flag {
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CLEAN_SHUTDOWN
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};
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enum flag_bits {
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CLEAN_SHUTDOWN_BIT = 0
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};
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superblock_flags();
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superblock_flags(uint32_t bits);
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void set_flag(flag f);
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void clear_flag(flag f);
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bool get_flag(flag f) const;
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uint32_t encode() const;
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uint32_t get_unhandled_flags() const;
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private:
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uint32_t unhandled_flags_;
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std::set<flag> flags_;
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};
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unsigned const SPACE_MAP_ROOT_SIZE = 128;
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uint64_t const SUPERBLOCK_LOCATION = 0;
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struct superblock {
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superblock();
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uint32_t csum;
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uint64_t blocknr;
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superblock_flags flags;
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__u8 uuid[16]; // FIXME: do we really need this?
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uint64_t magic;
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uint32_t version;
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__u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE];
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uint32_t data_block_size;
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uint32_t metadata_block_size;
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uint32_t nr_blocks;
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uint32_t current_era;
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era_detail current_detail;
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// A btree of undigested era_details
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uint64_t writeset_tree_root;
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// Big array holding the digested era/block info.
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uint64_t era_array_root;
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boost::optional<persistent_data::block_address> metadata_snap;
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};
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//--------------------------------
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namespace superblock_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 const &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 superblock_corrupt : public damage {
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superblock_corrupt(std::string const &desc);
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void visit(damage_visitor &v) const;
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};
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struct superblock_invalid : public damage {
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superblock_invalid(std::string const &desc);
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void visit(damage_visitor &v) const;
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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(damage const &d);
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virtual void visit(superblock_corrupt const &d) = 0;
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virtual void visit(superblock_invalid const &d) = 0;
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};
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}
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//--------------------------------
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superblock read_superblock(persistent_data::block_manager::ptr bm,
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persistent_data::block_address location = SUPERBLOCK_LOCATION);
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void write_superblock(persistent_data::block_manager::ptr bm,
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superblock const &sb,
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persistent_data::block_address location = SUPERBLOCK_LOCATION);
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void check_superblock(superblock const &sb,
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persistent_data::block_address nr_metadata_blocks,
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superblock_damage::damage_visitor &visitor);
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void check_superblock(persistent_data::block_manager::ptr bm,
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persistent_data::block_address nr_metadata_blocks,
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superblock_damage::damage_visitor &visitor);
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}
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//----------------------------------------------------------------
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#endif
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