thin-provisioning-tools/era/superblock.h

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