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b693c7d6b0
thin-provisioning-tools/thin-provisioning/metadata_checker.cc
Ming-Hung Tsai b693c7d6b0 [metadata_checker] Fix missing member initialization
2020-07-29 16:47:22 +08:00

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// 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 "base/nested_output.h"
#include "persistent-data/file_utils.h"
#include "persistent-data/space-maps/core.h"
#include "thin-provisioning/metadata.h"
#include "thin-provisioning/metadata_checker.h"
#include "thin-provisioning/metadata_counter.h"
#include "thin-provisioning/superblock.h"
using namespace boost;
using namespace persistent_data;
using namespace thin_provisioning;
//----------------------------------------------------------------
namespace {
class superblock_reporter : public superblock_detail::damage_visitor {
public:
superblock_reporter(nested_output &out)
: out_(out),
err_(NO_ERROR) {
}
virtual void visit(superblock_detail::superblock_corruption const &d) {
out_ << "superblock is corrupt" << end_message();
{
nested_output::nest _ = out_.push();
out_ << d.desc_ << end_message();
}
err_ << FATAL;
}
base::error_state get_error() const {
return err_;
}
private:
nested_output &out_;
error_state err_;
};
//--------------------------------
class devices_reporter : public device_tree_detail::damage_visitor {
public:
devices_reporter(nested_output &out)
: out_(out),
err_(NO_ERROR) {
}
virtual void visit(device_tree_detail::missing_devices const &d) {
out_ << "missing devices: " << d.keys_ << end_message();
{
nested_output::nest _ = out_.push();
out_ << d.desc_ << end_message();
}
err_ << FATAL;
}
error_state get_error() const {
return err_;
}
private:
nested_output &out_;
error_state err_;
};
//--------------------------------
class data_ref_counter : public mapping_tree_detail::mapping_visitor {
public:
data_ref_counter(space_map::ptr sm)
: sm_(sm) {
}
virtual void visit(btree_path const &path, mapping_tree_detail::block_time const &bt) {
sm_->inc(bt.block_);
}
private:
space_map::ptr sm_;
};
class mapping_reporter : public mapping_tree_detail::damage_visitor {
public:
mapping_reporter(nested_output &out)
: out_(out),
err_(NO_ERROR) {
}
virtual void visit(mapping_tree_detail::missing_devices const &d) {
out_ << "missing all mappings for devices: " << d.keys_ << end_message();
{
nested_output::nest _ = out_.push();
out_ << d.desc_ << end_message();
}
err_ << FATAL;
}
virtual void visit(mapping_tree_detail::missing_mappings const &d) {
out_ << "thin device " << d.thin_dev_ << " is missing mappings " << d.keys_ << end_message();
{
nested_output::nest _ = out_.push();
out_ << d.desc_ << end_message();
}
err_ << FATAL;
}
error_state get_error() const {
return err_;
}
private:
nested_output &out_;
error_state err_;
};
//--------------------------------
error_state examine_superblock(block_manager::ptr bm,
block_address sb_location,
nested_output &out) {
out << "examining superblock" << end_message();
nested_output::nest _ = out.push();
superblock_reporter sb_rep(out);
check_superblock(bm, sb_rep, sb_location);
return sb_rep.get_error();
}
error_state examine_devices_tree_(transaction_manager::ptr tm,
superblock_detail::superblock const &sb,
nested_output &out,
bool ignore_non_fatal) {
out << "examining devices tree" << end_message();
nested_output::nest _ = out.push();
devices_reporter dev_rep(out);
device_tree dtree(*tm, sb.device_details_root_,
device_tree_detail::device_details_traits::ref_counter());
check_device_tree(dtree, dev_rep, ignore_non_fatal);
return dev_rep.get_error();
}
error_state examine_top_level_mapping_tree_(transaction_manager::ptr tm,
superblock_detail::superblock const &sb,
nested_output &out,
bool ignore_non_fatal) {
out << "examining top level of mapping tree" << end_message();
nested_output::nest _ = out.push();
mapping_reporter mapping_rep(out);
dev_tree dtree(*tm, sb.data_mapping_root_,
mapping_tree_detail::mtree_traits::ref_counter(*tm));
check_mapping_tree(dtree, mapping_rep, ignore_non_fatal);
return mapping_rep.get_error();
}
error_state examine_mapping_tree_(transaction_manager::ptr tm,
superblock_detail::superblock const &sb,
nested_output &out,
optional<space_map::ptr> data_sm,
bool ignore_non_fatal) {
out << "examining mapping tree" << end_message();
nested_output::nest _ = out.push();
mapping_reporter mapping_rep(out);
mapping_tree mtree(*tm, sb.data_mapping_root_,
mapping_tree_detail::block_traits::ref_counter(tm->get_sm()));
if (data_sm) {
data_ref_counter dcounter(*data_sm);
walk_mapping_tree(mtree, dcounter, mapping_rep, ignore_non_fatal);
} else
check_mapping_tree(mtree, mapping_rep, ignore_non_fatal);
return mapping_rep.get_error();
}
error_state examine_top_level_mapping_tree(transaction_manager::ptr tm,
superblock_detail::superblock const &sb,
nested_output &out,
bool ignore_non_fatal) {
error_state err = examine_devices_tree_(tm, sb, out, ignore_non_fatal);
err << examine_top_level_mapping_tree_(tm, sb, out, ignore_non_fatal);
return err;
}
error_state examine_mapping_tree(transaction_manager::ptr tm,
superblock_detail::superblock const &sb,
nested_output &out,
optional<space_map::ptr> data_sm,
bool ignore_non_fatal) {
error_state err = examine_devices_tree_(tm, sb, out, ignore_non_fatal);
err << examine_mapping_tree_(tm, sb, out, data_sm, ignore_non_fatal);
return err;
}
error_state check_space_map_counts(transaction_manager::ptr tm,
superblock_detail::superblock const &sb,
nested_output &out) {
out << "checking space map counts" << end_message();
nested_output::nest _ = out.push();
block_counter bc;
count_metadata(tm, sb, bc);
// Finally we need to check the metadata space map agrees
// with the counts we've just calculated.
error_state err = NO_ERROR;
persistent_space_map::ptr metadata_sm =
open_metadata_sm(*tm, static_cast<void const*>(&sb.metadata_space_map_root_));
for (unsigned b = 0; b < metadata_sm->get_nr_blocks(); b++) {
ref_t c_actual = metadata_sm->get_count(b);
ref_t c_expected = bc.get_count(b);
if (c_actual != c_expected) {
out << "metadata reference counts differ for block " << b
<< ", expected " << c_expected
<< ", but got " << c_actual
<< end_message();
err << (c_actual > c_expected ? NON_FATAL : FATAL);
}
}
return err;
}
error_state compare_space_maps(space_map::ptr actual, space_map::ptr expected,
nested_output &out)
{
error_state err = NO_ERROR;
auto nr_blocks = actual->get_nr_blocks();
if (expected->get_nr_blocks() != nr_blocks) {
out << "internal error: nr blocks in space maps differ"
<< end_message();
err << FATAL;
} else {
for (block_address b = 0; b < nr_blocks; b++) {
auto a_count = actual->get_count(b);
auto e_count = actual->get_count(b);
if (a_count != e_count) {
out << "data reference counts differ for block " << b
<< ", expected " << e_count
<< ", but got " << a_count
<< end_message();
err << (a_count > e_count ? NON_FATAL : FATAL);
}
}
}
return err;
}
void print_info(transaction_manager::ptr tm,
superblock_detail::superblock const &sb,
nested_output &out)
{
out << "TRANSACTION_ID=" << sb.trans_id_ << "\n"
<< "METADATA_FREE_BLOCKS=" << tm->get_sm()->get_nr_free()
<< end_message();
}
block_address mapping_root(superblock_detail::superblock const &sb, check_options const &opts)
{
return opts.override_mapping_root_ ? *opts.override_mapping_root_ : sb.data_mapping_root_;
}
//--------------------------------
class metadata_checker {
public:
metadata_checker(block_manager::ptr bm,
check_options check_opts,
output_options output_opts)
: bm_(bm),
options_(check_opts),
out_(cerr, 2),
info_out_(cout, 0) {
if (output_opts == OUTPUT_QUIET) {
out_.disable();
info_out_.disable();
}
}
error_state check() {
error_state err = NO_ERROR;
auto sb_location = superblock_detail::SUPERBLOCK_LOCATION;
if (options_.use_metadata_snap_) {
superblock_detail::superblock sb = read_superblock(bm_, sb_location);
sb_location = sb.metadata_snap_;
if (sb_location == superblock_detail::SUPERBLOCK_LOCATION)
throw runtime_error("No metadata snapshot found.");
}
err << examine_superblock(bm_, sb_location, out_);
if (err == FATAL) {
if (check_for_xml(bm_))
out_ << "This looks like XML. thin_check only checks the binary metadata format." << end_message();
return err;
}
superblock_detail::superblock sb = read_superblock(bm_, sb_location);
transaction_manager::ptr tm = open_tm(bm_, sb_location);
sb.data_mapping_root_ = mapping_root(sb, options_);
print_info(tm, sb, info_out_);
if (options_.sm_opts_ == check_options::SPACE_MAP_FULL) {
space_map::ptr data_sm{open_disk_sm(*tm, &sb.data_space_map_root_)};
optional<space_map::ptr> core_sm{create_core_map(data_sm->get_nr_blocks())};
err << examine_data_mappings(tm, sb, options_.check_data_mappings_, out_, core_sm);
// if we're checking everything, and there were no errors,
// then we should check the space maps too.
if (err != FATAL) {
err << examine_metadata_space_map(tm, sb, options_.sm_opts_, out_);
if (core_sm)
err << compare_space_maps(data_sm, *core_sm, out_);
}
} else
err << examine_data_mappings(tm, sb, options_.check_data_mappings_, out_,
optional<space_map::ptr>());
return err;
}
private:
error_state
examine_data_mappings(transaction_manager::ptr tm,
superblock_detail::superblock const &sb,
check_options::data_mapping_options option,
nested_output &out,
optional<space_map::ptr> data_sm) {
error_state err = NO_ERROR;
switch (option) {
case check_options::DATA_MAPPING_LEVEL1:
err << examine_top_level_mapping_tree(tm, sb, out, options_.ignore_non_fatal_);
break;
case check_options::DATA_MAPPING_LEVEL2:
err << examine_mapping_tree(tm, sb, out, data_sm, options_.ignore_non_fatal_);
break;
default:
break; // do nothing
}
return err;
}
static error_state
examine_metadata_space_map(transaction_manager::ptr tm,
superblock_detail::superblock const &sb,
check_options::space_map_options option,
nested_output &out) {
error_state err = NO_ERROR;
switch (option) {
case check_options::SPACE_MAP_FULL:
err << check_space_map_counts(tm, sb, out);
break;
default:
break; // do nothing
}
return err;
}
block_manager::ptr bm_;
check_options options_;
nested_output out_;
nested_output info_out_;
};
}
//----------------------------------------------------------------
check_options::check_options()
: use_metadata_snap_(false),
check_data_mappings_(DATA_MAPPING_LEVEL2),
sm_opts_(SPACE_MAP_FULL),
ignore_non_fatal_(false) {
}
void check_options::set_superblock_only() {
check_data_mappings_ = DATA_MAPPING_NONE;
sm_opts_ = SPACE_MAP_NONE;
}
void check_options::set_skip_mappings() {
check_data_mappings_ = DATA_MAPPING_LEVEL1;
sm_opts_ = SPACE_MAP_NONE;
}
void check_options::set_override_mapping_root(block_address b) {
override_mapping_root_ = b;
}
void check_options::set_metadata_snap() {
use_metadata_snap_ = true;
sm_opts_ = SPACE_MAP_NONE;
}
void check_options::set_ignore_non_fatal() {
ignore_non_fatal_ = true;
}
base::error_state
thin_provisioning::check_metadata(block_manager::ptr bm,
check_options const &check_opts,
output_options output_opts)
{
metadata_checker checker(bm, check_opts, output_opts);
return checker.check();
}
//----------------------------------------------------------------
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