thin-provisioning-tools/thin-provisioning/restore_emitter.cc
Joe Thornber edf16f59c7 [restorer] Mappings only get inserted when the device is completed.
This saves looking up the device mapping tree for every insert.
2013-05-02 12:59:42 +01:00

146 lines
4.1 KiB
C++

// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
//
// This file is part of the thin-provisioning-tools source.
//
// thin-provisioning-tools is free software: you can redistribute it
// and/or modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// thin-provisioning-tools is distributed in the hope that it will be
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with thin-provisioning-tools. If not, see
// <http://www.gnu.org/licenses/>.
#include "restore_emitter.h"
using namespace boost;
using namespace std;
using namespace thin_provisioning;
//----------------------------------------------------------------
namespace {
class restorer : public emitter {
public:
restorer(metadata::ptr md)
: md_(md),
in_superblock_(false) {
}
virtual ~restorer() {
}
virtual void begin_superblock(std::string const &uuid,
uint64_t time,
uint64_t trans_id,
uint32_t data_block_size,
uint64_t nr_data_blocks,
optional<uint64_t> metadata_snap) {
in_superblock_ = true;
superblock &sb = md_->sb_;
memcpy(&sb.uuid_, &uuid, sizeof(&sb.uuid_));
sb.time_ = time;
sb.trans_id_ = trans_id;
sb.data_block_size_ = data_block_size;
sb.metadata_snap_ = metadata_snap ? *metadata_snap : 0;
md_->data_sm_->extend(nr_data_blocks);
}
virtual void end_superblock() {
if (!in_superblock_)
throw runtime_error("missing superblock");
md_->commit();
in_superblock_ = false;
}
virtual void begin_device(uint32_t dev,
uint64_t mapped_blocks,
uint64_t trans_id,
uint64_t creation_time,
uint64_t snap_time) {
if (!in_superblock_)
throw runtime_error("missing superblock");
if (device_exists(dev))
throw std::runtime_error("Device already exists");
// Add entry to the details tree
uint64_t key[1] = {dev};
device_details details = {mapped_blocks, trans_id, (uint32_t)creation_time, (uint32_t)snap_time};
md_->details_->insert(key, details);
// Insert an empty mapping tree
current_mapping_.reset(new single_mapping_tree(md_->tm_,
block_time_ref_counter(md_->data_sm_)));
current_device_ = optional<uint32_t>(dev);
}
virtual void end_device() {
uint64_t key[1] = {*current_device_};
md_->mappings_top_level_->insert(key, current_mapping_->get_root());
md_->mappings_->set_root(md_->mappings_top_level_->get_root()); // FIXME: ugly
current_device_ = optional<uint32_t>();
}
virtual void begin_named_mapping(std::string const &name) {
throw runtime_error("not implemented");
}
virtual void end_named_mapping() {
throw runtime_error("not implemented");
}
virtual void identifier(std::string const &name) {
throw runtime_error("not implemented");
}
virtual void range_map(uint64_t origin_begin, uint64_t data_begin, uint32_t time, uint64_t len) {
for (uint64_t i = 0; i < len; i++)
single_map(origin_begin++, data_begin++, time);
}
virtual void single_map(uint64_t origin_block, uint64_t data_block, uint32_t time) {
if (!current_device_)
throw runtime_error("not in device");
uint64_t key[1] = {origin_block};
block_time bt;
bt.block_ = data_block;
bt.time_ = time;
current_mapping_->insert(key, bt);
md_->data_sm_->inc(data_block);
}
private:
bool device_exists(thin_dev_t dev) const {
uint64_t key[1] = {dev};
detail_tree::maybe_value v = md_->details_->lookup(key);
return v;
}
metadata::ptr md_;
bool in_superblock_;
optional<uint32_t> current_device_;
single_mapping_tree::ptr current_mapping_;
};
}
//----------------------------------------------------------------
emitter::ptr
thin_provisioning::create_restore_emitter(metadata::ptr md)
{
return emitter::ptr(new restorer(md));
}
//----------------------------------------------------------------