130 lines
3.2 KiB
C++
130 lines
3.2 KiB
C++
// 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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#include "space_map_transactional.h"
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//----------------------------------------------------------------
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namespace {
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class sm_transactional : public checked_space_map {
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public:
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typedef shared_ptr<sm_transactional> ptr;
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sm_transactional(checked_space_map::ptr sm)
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: sm_(sm),
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committed_(sm_->clone()),
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allocated_(0),
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search_start_(0) {
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}
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virtual block_address get_nr_blocks() const {
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return committed_->get_nr_blocks();
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}
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virtual block_address get_nr_free() const {
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return committed_->get_nr_free() - allocated_;
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}
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virtual ref_t get_count(block_address b) const {
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return sm_->get_count(b);
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}
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virtual void set_count(block_address b, ref_t c) {
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sm_->set_count(b, c);
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}
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virtual void commit() {
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sm_->commit();
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committed_ = sm_->clone();
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allocated_ = 0;
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search_start_ = 0;
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}
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virtual void inc(block_address b) {
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// FIXME: this may do an implicit allocation, so
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// search_start_ and allocated_ will be wrong.
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sm_->inc(b);
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}
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virtual void dec(block_address b) {
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sm_->dec(b);
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}
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virtual maybe_block new_block() {
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return new_block(0, sm_->get_nr_blocks());
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}
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virtual maybe_block new_block(block_address begin, block_address end) {
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if (end <= search_start_)
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return maybe_block();
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maybe_block mb = committed_->new_block(max(search_start_, begin), end);
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if (mb) {
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allocated_++;
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search_start_ = *mb + 1;
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} else
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search_start_ = end;
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return mb;
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}
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virtual bool count_possibly_greater_than_one(block_address b) const {
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return sm_->count_possibly_greater_than_one(b);
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}
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virtual void extend(block_address extra_blocks) {
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return sm_->extend(extra_blocks);
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}
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virtual void iterate(iterator &it) const {
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sm_->iterate(it);
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}
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virtual size_t root_size() const {
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return sm_->root_size();
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}
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virtual void copy_root(void *dest, size_t len) const {
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return sm_->copy_root(dest, len);
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}
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virtual void check(block_counter &counter) const {
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return sm_->check(counter);
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}
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virtual checked_space_map::ptr clone() const {
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return checked_space_map::ptr(new sm_transactional(sm_));
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}
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private:
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checked_space_map::ptr sm_;
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checked_space_map::ptr committed_;
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block_address allocated_;
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block_address search_start_;
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};
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}
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//----------------------------------------------------------------
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checked_space_map::ptr
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persistent_data::create_transactional_sm(checked_space_map::ptr sm)
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{
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return checked_space_map::ptr(new sm_transactional(sm));
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}
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//----------------------------------------------------------------
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