thin-provisioning-tools/thin-provisioning/thin_check.cc

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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 <iostream>
#include <getopt.h>
#include <libgen.h>
#include "version.h"
#include "persistent-data/space-maps/core.h"
#include "thin-provisioning/device_tree.h"
#include "thin-provisioning/file_utils.h"
#include "thin-provisioning/mapping_tree.h"
#include "thin-provisioning/superblock.h"
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using namespace std;
using namespace thin_provisioning;
//----------------------------------------------------------------
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namespace {
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class end_message {};
class nested_output {
public:
nested_output(ostream &out, unsigned step)
: out_(out),
step_(step),
beginning_of_line_(true),
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enabled_(true),
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indent_(0) {
}
template <typename T>
nested_output &operator <<(T const &t) {
if (beginning_of_line_) {
beginning_of_line_ = false;
indent();
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}
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if (enabled_)
out_ << t;
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return *this;
}
nested_output &operator <<(end_message const &m) {
beginning_of_line_ = true;
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if (enabled_)
out_ << endl;
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return *this;
}
void inc_indent() {
indent_ += step_;
}
void dec_indent() {
indent_ -= step_;
}
struct nest {
nest(nested_output &out)
: out_(out) {
out_.inc_indent();
}
~nest() {
out_.dec_indent();
}
nested_output &out_;
};
nest push() {
return nest(*this);
}
void enable() {
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enabled_ = true;
}
void disable() {
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enabled_ = false;
}
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private:
void indent() {
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if (enabled_)
for (unsigned i = 0; i < indent_; i++)
out_ << ' ';
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}
ostream &out_;
unsigned step_;
bool beginning_of_line_;
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bool enabled_;
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unsigned indent_;
};
//--------------------------------
enum error_state {
NO_ERROR,
NON_FATAL, // eg, lost blocks
FATAL // needs fixing before pool can be activated
};
error_state
combine_errors(error_state lhs, error_state rhs) {
switch (lhs) {
case NO_ERROR:
return rhs;
case NON_FATAL:
return (rhs == FATAL) ? FATAL : lhs;
default:
return lhs;
}
}
//--------------------------------
block_manager<>::ptr
open_bm(string const &path) {
block_address nr_blocks = get_nr_blocks(path);
typename block_io<>::mode m = block_io<>::READ_ONLY;
return block_manager<>::ptr(new block_manager<>(path, nr_blocks, 1, m));
}
transaction_manager::ptr
open_tm(block_manager<>::ptr bm) {
space_map::ptr sm(new core_map(bm->get_nr_blocks()));
sm->inc(superblock_detail::SUPERBLOCK_LOCATION);
transaction_manager::ptr tm(new transaction_manager(bm, sm));
return tm;
}
//--------------------------------
class superblock_reporter : public superblock_detail::damage_visitor {
public:
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superblock_reporter(nested_output &out)
: out_(out),
err_(NO_ERROR) {
}
virtual void visit(superblock_detail::superblock_corruption const &d) {
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out_ << "superblock is corrupt" << end_message();
{
auto _ = out_.push();
out_ << d.desc_ << end_message();
}
err_ = combine_errors(err_, FATAL);
}
error_state get_error() const {
return err_;
}
private:
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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();
{
auto _ = out_.push();
out_ << d.desc_ << end_message();
}
err_ = combine_errors(err_, FATAL);
}
error_state get_error() const {
return err_;
}
private:
nested_output &out_;
error_state err_;
};
//--------------------------------
class mapping_reporter : public mapping_tree_detail::damage_visitor {
public:
mapping_reporter(nested_output &out)
: out_(out) {
}
virtual void visit(mapping_tree_detail::missing_devices const &d) {
out_ << "missing all mappings for devices: " << d.keys_ << end_message();
{
auto _ = out_.push();
out_ << d.desc_ << end_message();
}
err_ = combine_errors(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();
{
auto _ = out_.push();
out_ << d.desc_ << end_message();
}
err_ = combine_errors(err_, FATAL);
}
private:
nested_output &out_;
error_state err_;
};
//--------------------------------
struct flags {
bool check_device_tree;
bool check_mapping_tree_level1;
bool check_mapping_tree_level2;
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bool ignore_non_fatal_errors;
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bool quiet;
};
error_state metadata_check(string const &path, flags fs) {
block_manager<>::ptr bm = open_bm(path);
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nested_output out(cerr, 2);
if (fs.quiet)
out.disable();
superblock_reporter sb_rep(out);
devices_reporter dev_rep(out);
mapping_reporter mapping_rep(out);
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out << "examining superblock" << end_message();
{
auto _ = out.push();
check_superblock(bm, sb_rep);
}
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if (sb_rep.get_error() == FATAL)
return FATAL;
superblock_detail::superblock sb = read_superblock(bm);
transaction_manager::ptr tm = open_tm(bm);
if (fs.check_device_tree) {
out << "examining devices tree" << end_message();
{
auto _ = out.push();
device_tree dtree(tm, sb.device_details_root_,
device_tree_detail::device_details_traits::ref_counter());
check_device_tree(dtree, dev_rep);
}
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}
if (fs.check_mapping_tree_level1 && !fs.check_mapping_tree_level2) {
out << "examining top level of mapping tree" << end_message();
{
auto _ = out.push();
dev_tree dtree(tm, sb.data_mapping_root_,
mapping_tree_detail::mtree_traits::ref_counter(tm));
check_mapping_tree(dtree, mapping_rep);
}
} else if (fs.check_mapping_tree_level2) {
out << "examining mapping tree" << end_message();
{
auto _ = out.push();
mapping_tree mtree(tm, sb.data_mapping_root_,
mapping_tree_detail::block_traits::ref_counter(tm->get_sm()));
check_mapping_tree(mtree, mapping_rep);
}
}
return combine_errors(sb_rep.get_error(),
dev_rep.get_error());
}
int check(string const &path, flags fs) {
error_state err;
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try {
err = metadata_check(path, fs);
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} catch (std::exception &e) {
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if (!fs.quiet)
cerr << e.what() << endl;
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return 1;
}
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if (fs.ignore_non_fatal_errors)
return (err == FATAL) ? 1 : 0;
else
return (err == NO_ERROR) ? 0 : 1;
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}
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void usage(ostream &out, string const &cmd) {
out << "Usage: " << cmd << " [options] {device|file}" << endl
<< "Options:" << endl
<< " {-q|--quiet}" << endl
<< " {-h|--help}" << endl
<< " {-V|--version}" << endl
<< " {--super-block-only}" << endl
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<< " {--skip-mappings}" << endl
<< " {--ignore-non-fatal-errors}" << endl;
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}
}
int main(int argc, char **argv)
{
int c;
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flags fs = {
.check_device_tree = true,
.check_mapping_tree_level1 = true,
.check_mapping_tree_level2 = true,
.ignore_non_fatal_errors = false,
.quiet = false
};
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char const shortopts[] = "qhV";
option const longopts[] = {
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{ "quiet", no_argument, NULL, 'q'},
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{ "help", no_argument, NULL, 'h'},
{ "version", no_argument, NULL, 'V'},
{ "super-block-only", no_argument, NULL, 1},
{ "skip-mappings", no_argument, NULL, 2},
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{ "ignore-non-fatal-errors", no_argument, NULL, 3},
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{ NULL, no_argument, NULL, 0 }
};
while ((c = getopt_long(argc, argv, shortopts, longopts, NULL)) != -1) {
switch(c) {
case 'h':
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usage(cout, basename(argv[0]));
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return 0;
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case 'q':
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fs.quiet = true;
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break;
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case 'V':
cout << THIN_PROVISIONING_TOOLS_VERSION << endl;
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return 0;
case 1:
// super-block-only
fs.check_device_tree = false;
fs.check_mapping_tree_level1 = false;
fs.check_mapping_tree_level2 = false;
break;
case 2:
// skip-mappings
fs.check_mapping_tree_level2 = false;
break;
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case 3:
// ignore-non-fatal-errors
fs.ignore_non_fatal_errors = true;
break;
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default:
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usage(cerr, basename(argv[0]));
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return 1;
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}
}
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if (argc == optind) {
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if (!fs.quiet) {
cerr << "No input file provided." << endl;
usage(cerr, basename(argv[0]));
}
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exit(1);
}
return check(argv[optind], fs);
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}