thin-provisioning-tools/thin-provisioning/mapping_tree.h
Joe Thornber 0098803345 [thinp_*] Make mtree_ref_counter derive from ref_counter.
Slight performance hit, but I'd rather everything was derived
from ref_counter.

Also implement it!  Not sure why this wasn't done before.
2020-04-08 12:24:37 +01:00

154 lines
4.0 KiB
C++

#ifndef MAPPING_TREE_H
#define MAPPING_TREE_H
#include "persistent-data/data-structures/btree.h"
#include "persistent-data/run.h"
//----------------------------------------------------------------
namespace thin_provisioning {
namespace mapping_tree_detail {
class space_map_ref_counter {
public:
space_map_ref_counter(space_map::ptr sm);
void inc(block_address b);
void dec(block_address b);
private:
space_map::ptr sm_;
};
struct block_time {
uint64_t block_;
uint32_t time_;
};
class block_time_ref_counter {
public:
block_time_ref_counter(space_map::ptr sm);
void inc(block_time bt);
void dec(block_time bt);
private:
space_map::ptr sm_;
};
struct block_traits {
typedef base::le64 disk_type;
typedef block_time value_type;
typedef block_time_ref_counter ref_counter;
static void unpack(disk_type const &disk, value_type &value);
static void pack(value_type const &value, disk_type &disk);
};
class mtree_ref_counter final : public ref_counter<block_address> {
public:
mtree_ref_counter(transaction_manager &tm);
void set(block_address const &b, uint32_t rc);
void inc(block_address const &b);
void dec(block_address const &b);
private:
transaction_manager &tm_;
};
// This value type is itself a tree containing mappings.
// Used when manipulating the top level of the mapping
// tree.
struct mtree_traits {
typedef base::le64 disk_type;
typedef uint64_t value_type;
typedef mtree_ref_counter ref_counter;
static void unpack(disk_type const &disk, value_type &value);
static void pack(value_type const &value, disk_type &disk);
};
//--------------------------------
class damage_visitor;
struct damage {
virtual ~damage() {}
virtual void visit(damage_visitor &v) const = 0;
};
struct missing_devices : public damage {
missing_devices(std::string const &desc, run<uint64_t> const &keys);
virtual void visit(damage_visitor &v) const;
std::string desc_;
run<uint64_t> keys_;
};
struct missing_mappings : public damage {
missing_mappings(std::string const &desc, uint64_t thin_dev,
run<uint64_t> const &keys);
virtual void visit(damage_visitor &v) const;
std::string desc_;
uint64_t thin_dev_;
run<uint64_t> keys_;
};
class damage_visitor {
public:
typedef boost::shared_ptr<damage_visitor> ptr;
virtual ~damage_visitor() {}
void visit(damage const &d) {
d.visit(*this);
}
virtual void visit(missing_devices const &d) = 0;
virtual void visit(missing_mappings const &d) = 0;
};
class mapping_visitor {
public:
virtual ~mapping_visitor() {}
// path contains 2 elements, the dev key, then the oblock
virtual void visit(btree_path const &path, block_time const &m) = 0;
};
class device_visitor {
public:
virtual ~device_visitor() {}
virtual void visit(btree_path const &path, block_address dtree_root) = 0;
};
}
typedef persistent_data::btree<2, mapping_tree_detail::block_traits> mapping_tree;
typedef persistent_data::btree<1, mapping_tree_detail::mtree_traits> dev_tree;
typedef persistent_data::btree<1, mapping_tree_detail::block_traits> single_mapping_tree;
void walk_mapping_tree(dev_tree const &tree,
mapping_tree_detail::device_visitor &dev_v,
mapping_tree_detail::damage_visitor &dv);
void check_mapping_tree(dev_tree const &tree,
mapping_tree_detail::damage_visitor &visitor);
void walk_mapping_tree(mapping_tree const &tree,
mapping_tree_detail::mapping_visitor &mv,
mapping_tree_detail::damage_visitor &dv);
void check_mapping_tree(mapping_tree const &tree,
mapping_tree_detail::damage_visitor &visitor);
void walk_mapping_tree(single_mapping_tree const &tree,
uint64_t dev_id,
mapping_tree_detail::mapping_visitor &mv,
mapping_tree_detail::damage_visitor &dv);
void check_mapping_tree(single_mapping_tree const &tree,
uint64_t dev_id,
mapping_tree_detail::damage_visitor &visitor);
}
//----------------------------------------------------------------
#endif