thin-provisioning-tools/thin-provisioning/metadata_dumper.cc

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