thin-provisioning-tools/thin-provisioning/metadata_checker.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/file_utils.h"
#include "thin-provisioning/metadata.h"
#include "thin-provisioning/metadata_checker.h"
#include "thin-provisioning/superblock_validator.h"
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using namespace persistent_data;
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using namespace thin_provisioning;
//----------------------------------------------------------------
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void
metadata_damage::set_message(std::string const &message)
{
message_ = message;
}
std::string const &
metadata_damage::get_message() const
{
return message_;
}
//--------------------------------
void
super_block_corruption::visit(metadata_damage_visitor &visitor) const
{
visitor.visit(*this);
}
bool
super_block_corruption::operator ==(super_block_corruption const &rhs) const
{
return true;
}
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//--------------------------------
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missing_device_details::missing_device_details(range64 missing)
: missing_(missing)
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{
}
void
missing_device_details::visit(metadata_damage_visitor &visitor) const
{
visitor.visit(*this);
}
bool
missing_device_details::operator ==(missing_device_details const &rhs) const
{
return missing_ == rhs.missing_;
}
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//--------------------------------
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missing_devices::missing_devices(range64 missing)
: missing_(missing)
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{
}
void
missing_devices::visit(metadata_damage_visitor &visitor) const
{
visitor.visit(*this);
}
bool
missing_devices::operator ==(missing_devices const &rhs) const
{
return missing_ == rhs.missing_;
}
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//--------------------------------
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missing_mappings::missing_mappings(uint64_t dev, range64 missing)
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: dev_(dev),
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missing_(missing)
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{
}
void
missing_mappings::visit(metadata_damage_visitor &visitor) const
{
visitor.visit(*this);
}
bool
missing_mappings::operator ==(missing_mappings const &rhs) const
{
return dev_ == rhs.dev_ && missing_ == rhs.missing_;
}
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//--------------------------------
bad_metadata_ref_count::bad_metadata_ref_count(block_address b,
ref_t actual,
ref_t expected)
: b_(b),
actual_(actual),
expected_(expected)
{
}
void
bad_metadata_ref_count::visit(metadata_damage_visitor &visitor) const
{
visitor.visit(*this);
}
bool
bad_metadata_ref_count::operator ==(bad_metadata_ref_count const &rhs) const
{
return b_ == rhs.b_ && actual_ == rhs.actual_ && expected_ == rhs.expected_;
}
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//--------------------------------
bad_data_ref_count::bad_data_ref_count(block_address b,
ref_t actual,
ref_t expected)
: b_(b),
actual_(actual),
expected_(expected)
{
}
void
bad_data_ref_count::visit(metadata_damage_visitor &visitor) const
{
visitor.visit(*this);
}
bool
bad_data_ref_count::operator ==(bad_data_ref_count const &rhs) const
{
return b_ == rhs.b_ && actual_ == rhs.actual_ && expected_ == rhs.expected_;
}
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//--------------------------------
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missing_metadata_ref_counts::missing_metadata_ref_counts(range64 missing)
: missing_(missing)
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{
}
void
missing_metadata_ref_counts::visit(metadata_damage_visitor &visitor) const
{
visitor.visit(*this);
}
bool
missing_metadata_ref_counts::operator ==(missing_metadata_ref_counts const &rhs) const
{
return missing_ == rhs.missing_;
}
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//--------------------------------
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missing_data_ref_counts::missing_data_ref_counts(range64 missing)
: missing_(missing)
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{
}
void
missing_data_ref_counts::visit(metadata_damage_visitor &visitor) const
{
visitor.visit(*this);
}
bool
missing_data_ref_counts::operator ==(missing_data_ref_counts const &rhs) const
{
return missing_ == rhs.missing_;
}
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//--------------------------------
void
metadata_damage_visitor::visit(metadata_damage const &damage)
{
damage.visit(*this);
}
//--------------------------------
checker::checker(block_manager::ptr bm)
: bm_(bm)
{
}
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//----------------------------------------------------------------
#if 0
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namespace {
// As well as the standard btree checks, we build up a set of what
// devices having mappings defined, which can later be cross
// referenced with the details tree. A separate block_counter is
// used to later verify the data space map.
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class mapping_validator : public btree<2, block_traits>::visitor {
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public:
typedef boost::shared_ptr<mapping_validator> ptr;
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typedef btree_checker<2, block_traits> checker;
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mapping_validator(block_counter &metadata_counter, block_counter &data_counter)
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: checker_(metadata_counter),
data_counter_(data_counter)
{
}
bool visit_internal(unsigned level,
bool sub_root,
optional<uint64_t> key,
btree_detail::node_ref<uint64_traits> const &n) {
return checker_.visit_internal(level, sub_root, key, n);
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}
bool visit_internal_leaf(unsigned level,
bool sub_root,
optional<uint64_t> key,
btree_detail::node_ref<uint64_traits> const &n) {
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bool r = checker_.visit_internal_leaf(level, sub_root, key, n);
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for (unsigned i = 0; i < n.get_nr_entries(); i++)
devices_.insert(n.key_at(i));
return r;
}
bool visit_leaf(unsigned level,
bool sub_root,
optional<uint64_t> key,
btree_detail::node_ref<block_traits> const &n) {
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bool r = checker_.visit_leaf(level, sub_root, key, n);
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if (r)
for (unsigned i = 0; i < n.get_nr_entries(); i++)
data_counter_.inc(n.value_at(i).block_);
return r;
}
set<uint64_t> const &get_devices() const {
return devices_;
}
private:
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checker checker_;
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block_counter &data_counter_;
set<uint64_t> devices_;
};
struct check_count : public space_map::iterator {
check_count(string const &desc, block_counter const &expected)
: bad_(false),
expected_(expected),
errors_(new error_set(desc)) {
}
virtual void operator() (block_address b, ref_t actual) {
ref_t expected = expected_.get_count(b);
if (actual != expected) {
ostringstream out;
out << b << ": was " << actual
<< ", expected " << expected;
errors_->add_child(out.str());
bad_ = true;
}
}
bool bad_;
block_counter const &expected_;
error_set::ptr errors_;
};
optional<error_set::ptr>
check_ref_counts(string const &desc, block_counter const &counts,
space_map::ptr sm) {
check_count checker(desc, counts);
sm->iterate(checker);
return checker.bad_ ? optional<error_set::ptr>(checker.errors_) : optional<error_set::ptr>();
}
class metadata_checker {
public:
metadata_checker(string const &dev_path)
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: bm_(open_bm(dev_path)),
errors_(new error_set("Errors in metadata")) {
}
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boost::optional<error_set::ptr> check() {
#if 1
superblock sb = read_superblock();
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// FIXME: check version?
check_mappings();
return (errors_->get_children().size() > 0) ?
optional<error_set::ptr>(errors_) :
optional<error_set::ptr>();
#else
error_set::ptr errors(new error_set("Errors in metadata"));
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if (md->sb_.metadata_snap_) {
block_manager<>::ptr bm = md->tm_->get_bm();
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block_address root = md->sb_.metadata_snap_;
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metadata_counter.inc(root);
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superblock sb;
block_manager<>::read_ref r = bm->read_lock(root);
superblock_disk const *sbd = reinterpret_cast<superblock_disk const *>(&r.data());
superblock_traits::unpack(*sbd, sb);
metadata_counter.inc(sb.data_mapping_root_);
metadata_counter.inc(sb.device_details_root_);
}
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set<uint64_t> const &mapped_devs = mv->get_devices();
details_validator::ptr dv(new details_validator(metadata_counter));
md->details_->visit(dv);
set<uint64_t> const &details_devs = dv->get_devices();
for (set<uint64_t>::const_iterator it = mapped_devs.begin(); it != mapped_devs.end(); ++it)
if (details_devs.count(*it) == 0) {
ostringstream out;
out << "mapping exists for device " << *it
<< ", yet there is no entry in the details tree.";
throw runtime_error(out.str());
}
metadata_counter.inc(SUPERBLOCK_LOCATION);
md->metadata_sm_->check(metadata_counter);
md->data_sm_->check(metadata_counter);
errors->add_child(check_ref_counts("Errors in metadata block reference counts",
metadata_counter, md->metadata_sm_));
errors->add_child(check_ref_counts("Errors in data block reference counts",
data_counter, md->data_sm_));
return (errors->get_children().size() > 0) ?
optional<error_set::ptr>(errors) :
optional<error_set::ptr>();
#endif
}
private:
static block_manager<>::ptr
open_bm(string const &dev_path) {
block_address nr_blocks = thin_provisioning::get_nr_blocks(dev_path);
return block_manager<>::ptr(new block_manager<>(dev_path, nr_blocks, 1, block_io<>::READ_ONLY));
}
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// FIXME: common code with metadata.cc
superblock read_superblock() {
superblock sb;
block_manager<>::read_ref r = bm_->read_lock(SUPERBLOCK_LOCATION, superblock_validator());
superblock_disk const *sbd = reinterpret_cast<superblock_disk const *>(&r.data());
superblock_traits::unpack(*sbd, sb);
return sb;
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}
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void check_mappings() {
mapping_validator::ptr mv(
new mapping_validator(metadata_counter_,
data_counter_));
md->mappings_->visit(mv);
}
typedef block_manager<>::read_ref read_ref;
typedef block_manager<>::write_ref write_ref;
typedef boost::shared_ptr<metadata> ptr;
block_manager<>::ptr bm_;
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error_set::ptr errors_;
block_counter metadata_counter_, data_counter_;
#if 0
tm_ptr tm_;
superblock sb_;
checked_space_map::ptr metadata_sm_;
checked_space_map::ptr data_sm_;
detail_tree::ptr details_;
dev_tree::ptr mappings_top_level_;
mapping_tree::ptr mappings_;
#endif
};
}
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//----------------------------------------------------------------
boost::optional<error_set::ptr>
thin_provisioning::metadata_check(std::string const &dev_path)
{
metadata_checker checker(dev_path);
return checker.check();
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}
//----------------------------------------------------------------
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#endif