d8a208cbc8
new_block() is now a concrete method implemented using the virtual find_free() and inc() methods. recursive space map is better at giving correct reference counts.
120 lines
2.8 KiB
C++
120 lines
2.8 KiB
C++
// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
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//
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// This file is part of the thin-provisioning-tools source.
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//
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// thin-provisioning-tools is free software: you can redistribute it
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// and/or modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation, either version 3 of
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// the License, or (at your option) any later version.
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//
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// thin-provisioning-tools is distributed in the hope that it will be
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// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with thin-provisioning-tools. If not, see
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// <http://www.gnu.org/licenses/>.
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#ifndef CORE_MAP_H
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#define CORE_MAP_H
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#include "persistent-data/space_map.h"
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//----------------------------------------------------------------
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namespace persistent_data {
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class core_map : public checked_space_map {
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public:
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typedef boost::shared_ptr<core_map> ptr;
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core_map(block_address nr_blocks)
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: counts_(nr_blocks, 0),
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nr_free_(nr_blocks) {
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}
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block_address get_nr_blocks() const {
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return counts_.size();
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}
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block_address get_nr_free() const {
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return nr_free_;
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}
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ref_t get_count(block_address b) const {
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return counts_[b];
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}
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void set_count(block_address b, ref_t c) {
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if (counts_[b] == 0 && c > 0)
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nr_free_--;
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else if (counts_[b] > 0 && c == 0)
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nr_free_++;
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counts_[b] = c;
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}
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void commit() {
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}
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void inc(block_address b) {
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if (counts_[b] == 0)
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nr_free_--;
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counts_[b]++;
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}
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void dec(block_address b) {
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counts_[b]--;
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if (counts_[b] == 0)
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nr_free_++;
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}
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maybe_block find_free(span_iterator &it) {
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for (maybe_span ms = it.first(); ms; ms = it.next()) {
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for (block_address b = ms->first; b < ms->second; b++) {
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if (b >= counts_.size())
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throw std::runtime_error("block out of bounds");
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if (!counts_[b])
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return maybe_block(b);
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}
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}
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return maybe_block();
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}
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bool count_possibly_greater_than_one(block_address b) const {
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return counts_[b] > 1;
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}
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void extend(block_address extra_blocks) {
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throw std::runtime_error("'extend' not implemented");
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}
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// FIXME: meaningless, but this class is only used for testing
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size_t root_size() const {
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return 0;
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}
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// FIXME: meaningless, but this class is only used for testing
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virtual void copy_root(void *dest, size_t len) const {
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throw std::runtime_error("'copy root' not implemented");
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}
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checked_space_map::ptr clone() const {
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return ptr(new core_map(*this));
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}
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private:
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std::vector<ref_t> counts_;
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unsigned nr_free_;
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};
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}
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//----------------------------------------------------------------
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#endif
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