259 lines
6.9 KiB
C++
259 lines
6.9 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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#include "thin-provisioning/emitter.h"
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#include "thin-provisioning/metadata_dumper.h"
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#include "thin-provisioning/mapping_tree.h"
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using namespace persistent_data;
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using namespace thin_provisioning;
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//----------------------------------------------------------------
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namespace {
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void raise_metadata_damage() {
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throw std::runtime_error("metadata contains errors (run thin_check for details).\n"
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"perhaps you wanted to run with --repair");
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}
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//--------------------------------
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struct ignore_details_damage : public device_tree_detail::damage_visitor {
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void visit(device_tree_detail::missing_devices const &d) {
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}
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};
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struct fatal_details_damage : public device_tree_detail::damage_visitor {
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void visit(device_tree_detail::missing_devices const &d) {
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raise_metadata_damage();
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}
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};
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device_tree_detail::damage_visitor::ptr details_damage_policy(bool repair) {
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typedef device_tree_detail::damage_visitor::ptr dvp;
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if (repair)
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return dvp(new ignore_details_damage());
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else
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return dvp(new fatal_details_damage());
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}
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//--------------------------------
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struct ignore_mapping_damage : public mapping_tree_detail::damage_visitor {
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void visit(mapping_tree_detail::missing_devices const &d) {
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}
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void visit(mapping_tree_detail::missing_mappings const &d) {
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}
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};
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struct fatal_mapping_damage : public mapping_tree_detail::damage_visitor {
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void visit(mapping_tree_detail::missing_devices const &d) {
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raise_metadata_damage();
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}
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void visit(mapping_tree_detail::missing_mappings const &d) {
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raise_metadata_damage();
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}
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};
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mapping_tree_detail::damage_visitor::ptr mapping_damage_policy(bool repair) {
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typedef mapping_tree_detail::damage_visitor::ptr mvp;
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if (repair)
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return mvp(new ignore_mapping_damage());
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else
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return mvp(new fatal_mapping_damage());
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}
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//--------------------------------
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typedef map<block_address, device_tree_detail::device_details> dd_map;
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class details_extractor : public device_tree_detail::device_visitor {
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public:
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void visit(block_address dev_id, device_tree_detail::device_details const &dd) {
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dd_.insert(make_pair(dev_id, dd));
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}
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dd_map const &get_details() const {
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return dd_;
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}
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private:
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dd_map dd_;
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};
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class mapping_emitter : public mapping_tree_detail::mapping_visitor {
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public:
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mapping_emitter(emitter::ptr e)
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: e_(e),
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in_range_(false) {
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}
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~mapping_emitter() {
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end_mapping();
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}
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typedef mapping_tree_detail::block_time block_time;
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void visit(btree_path const &path, block_time const &bt) {
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add_mapping(path[0], bt);
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}
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private:
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void start_mapping(uint64_t origin_block, block_time const &bt) {
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origin_start_ = origin_block;
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dest_start_ = bt.block_;
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time_ = bt.time_;
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len_ = 1;
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in_range_ = true;
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}
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void end_mapping() {
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if (in_range_) {
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if (len_ == 1)
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e_->single_map(origin_start_, dest_start_, time_);
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else
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e_->range_map(origin_start_, dest_start_, time_, len_);
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in_range_ = false;
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}
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}
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void add_mapping(uint64_t origin_block, block_time const &bt) {
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if (!in_range_)
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start_mapping(origin_block, bt);
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else if (origin_block == origin_start_ + len_ &&
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bt.block_ == dest_start_ + len_ &&
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time_ == bt.time_)
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len_++;
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else {
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end_mapping();
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start_mapping(origin_block, bt);
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}
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}
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emitter::ptr e_;
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block_address origin_start_;
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block_address dest_start_;
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uint32_t time_;
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block_address len_;
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bool in_range_;
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};
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class mapping_tree_emitter : public mapping_tree_detail::device_visitor {
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public:
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mapping_tree_emitter(metadata::ptr md,
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emitter::ptr e,
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dd_map const &dd,
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bool repair,
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mapping_tree_detail::damage_visitor::ptr damage_policy)
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: md_(md),
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e_(e),
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dd_(dd),
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repair_(repair),
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damage_policy_(damage_policy) {
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}
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void visit(btree_path const &path, block_address tree_root) {
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block_address dev_id = path[0];
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dd_map::const_iterator it = dd_.find(path[0]);
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if (it != dd_.end()) {
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device_tree_detail::device_details const &d = it->second;
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e_->begin_device(dev_id,
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d.mapped_blocks_,
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d.transaction_id_,
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d.creation_time_,
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d.snapshotted_time_);
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try {
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emit_mappings(tree_root);
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} catch (exception &e) {
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cerr << e.what();
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e_->end_device();
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throw;
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}
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e_->end_device();
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} else if (!repair_) {
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ostringstream msg;
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msg << "mappings present for device " << dev_id
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<< ", but it isn't present in device tree";
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throw runtime_error(msg.str());
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}
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}
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private:
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void emit_mappings(block_address subtree_root) {
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mapping_emitter me(e_);
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single_mapping_tree tree(*md_->tm_, subtree_root,
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mapping_tree_detail::block_time_ref_counter(md_->data_sm_));
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walk_mapping_tree(tree, static_cast<mapping_tree_detail::mapping_visitor &>(me), *damage_policy_);
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}
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metadata::ptr md_;
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emitter::ptr e_;
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dd_map const &dd_;
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bool repair_;
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mapping_tree_detail::damage_visitor::ptr damage_policy_;
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};
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block_address get_nr_blocks(metadata::ptr md) {
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if (md->data_sm_)
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return md->data_sm_->get_nr_blocks();
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else if (md->sb_.blocknr_ == superblock_detail::SUPERBLOCK_LOCATION)
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// grab from the root structure of the space map
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return get_nr_blocks_in_data_sm(*md->tm_, &md->sb_.data_space_map_root_);
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else
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// metadata snap, we really don't know
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return 0ull;
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}
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}
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//----------------------------------------------------------------
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void
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thin_provisioning::metadata_dump(metadata::ptr md, emitter::ptr e, bool repair)
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{
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details_extractor de;
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device_tree_detail::damage_visitor::ptr dd_policy(details_damage_policy(repair));
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walk_device_tree(*md->details_, de, *dd_policy);
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e->begin_superblock("", md->sb_.time_,
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md->sb_.trans_id_,
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md->sb_.data_block_size_,
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get_nr_blocks(md),
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boost::optional<block_address>());
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{
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mapping_tree_detail::damage_visitor::ptr md_policy(mapping_damage_policy(repair));
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mapping_tree_emitter mte(md, e, de.get_details(), repair, mapping_damage_policy(repair));
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walk_mapping_tree(*md->mappings_top_level_, mte, *md_policy);
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}
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e->end_superblock();
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}
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//----------------------------------------------------------------
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