69 lines
1.9 KiB
C++
69 lines
1.9 KiB
C++
#ifndef THIN_RMAP_VISITOR_H
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#define THIN_RMAP_VISITOR_H
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#include "persistent-data/run.h"
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#include "thin-provisioning/mapping_tree.h"
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//----------------------------------------------------------------
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namespace thin_provisioning {
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// This value visitor (see btree_damage_visitor.h) produces a
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// reverse mapping for parts of the data device.
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//
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// i) Use add_data_region() to specify which areas of the data device you're interested in.
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// ii) visit the mapping tree
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// iii) call complete()
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// iv) get the rmaps with get_rmap();
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class rmap_visitor {
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public:
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typedef run<block_address> region;
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rmap_visitor();
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// Specify which regions of the data device you want the rmap for.
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void add_data_region(region const &r);
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void visit(btree_path const &path, mapping_tree_detail::block_time const &bt);
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struct rmap_region {
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// FIXME: surely we don't need to provide this for
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// a POD structure?
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bool operator ==(rmap_region const &rhs) const {
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return ((data_begin == rhs.data_begin) &&
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(data_end == rhs.data_end) &&
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(thin_dev == rhs.thin_dev) &&
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(thin_begin == rhs.thin_begin));
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}
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block_address data_begin;
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block_address data_end;
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uint32_t thin_dev;
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block_address thin_begin;
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};
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void complete();
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vector<rmap_region> const &get_rmap() const;
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private:
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bool in_regions(block_address b) const;
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bool adjacent_block(rmap_region const &rr,
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uint32_t thin_dev, block_address thin_block,
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block_address data_block) const;
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void insert_new_region(uint32_t thin_dev, block_address thin_block,
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block_address data_block);
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void push_current();
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void visit_block(uint32_t thin_dev, block_address thin_block,
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block_address data_block);
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vector<region> regions_;
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boost::optional<rmap_region> current_rmap_;
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vector<rmap_region> rmap_;
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};
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}
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//----------------------------------------------------------------
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#endif
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