thin-provisioning-tools/caching/cache_check.cc

262 lines
5.3 KiB
C++

#include <iostream>
#include <sstream>
#include <string>
#include <stdexcept>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <libgen.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "base/error_state.h"
#include "base/nested_output.h"
#include "caching/metadata.h"
#include "persistent-data/block.h"
#include "persistent-data/file_utils.h"
#include "persistent-data/space-maps/core.h"
using namespace boost;
using namespace caching;
using namespace persistent_data;
using namespace std;
//----------------------------------------------------------------
namespace {
class reporter_base {
public:
reporter_base(nested_output &o)
: out_(o),
err_(NO_ERROR) {
}
virtual ~reporter_base() {}
nested_output &out() {
return out_;
}
nested_output::nest push() {
return out_.push();
}
base::error_state get_error() const {
return err_;
}
void mplus_error(error_state err) {
err_ = combine_errors(err_, err);
}
private:
nested_output &out_;
error_state err_;
};
class superblock_reporter : public superblock_detail::damage_visitor, reporter_base {
public:
superblock_reporter(nested_output &o)
: reporter_base(o) {
}
virtual void visit(superblock_detail::superblock_corruption const &d) {
out() << "superblock is corrupt" << end_message();
{
nested_output::nest _ = push();
out() << d.desc_ << end_message();
}
mplus_error(FATAL);
}
using reporter_base::get_error;
};
class mapping_reporter : public reporter_base {
public:
mapping_reporter(nested_output &o)
: reporter_base(o) {
}
};
class hint_reporter : public reporter_base {
public:
hint_reporter(nested_output &o)
: reporter_base(o) {
}
};
//--------------------------------
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;
}
//--------------------------------
struct flags {
flags()
: check_mappings_(false),
check_hints_(false),
ignore_non_fatal_errors_(false),
quiet_(false) {
}
bool check_mappings_;
bool check_hints_;
bool ignore_non_fatal_errors_;
bool quiet_;
};
struct stat guarded_stat(string const &path) {
struct stat info;
int r = ::stat(path.c_str(), &info);
if (r) {
ostringstream msg;
char buffer[128], *ptr;
ptr = ::strerror_r(errno, buffer, sizeof(buffer));
msg << path << ": " << ptr;
throw runtime_error(msg.str());
}
return info;
}
error_state metadata_check(block_manager<>::ptr bm, flags const &fs) {
error_state err = NO_ERROR;
nested_output out(cerr, 2);
if (fs.quiet_)
out.disable();
superblock_reporter sb_rep(out);
mapping_reporter mapping_rep(out);
hint_reporter hint_rep(out);
out << "examining superblock" << end_message();
{
nested_output::nest _ = out.push();
check_superblock(bm, sb_rep);
}
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_mappings_) {
out << "examining mapping array" << end_message();
{
nested_output::nest _ = out.push();
mapping_array ma(tm, mapping_array::ref_counter(), sb.mapping_root, sb.cache_blocks);
// check_mapping_array(ma, mapping_rep);
}
}
if (fs.check_hints_) {
out << "examining hint array" << end_message();
{
nested_output::nest _ = out.push();
}
}
return err;
}
int check(string const &path, flags const &fs) {
error_state err;
struct stat info = guarded_stat(path);
if (!S_ISREG(info.st_mode) && !S_ISBLK(info.st_mode)) {
ostringstream msg;
msg << path << ": " << "Not a block device or regular file";
throw runtime_error(msg.str());
}
try {
block_manager<>::ptr bm = open_bm(path, block_io<>::READ_ONLY);
err = metadata_check(bm, fs);
#if 0
if (maybe_errors) {
if (!fs.quiet_)
cerr << error_selector(*maybe_errors, 3);
return 1;
}
#endif
} catch (std::exception &e) {
if (!fs.quiet_)
cerr << e.what() << endl;
return 1;
}
return err == NO_ERROR ? 0 : 1;
}
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;
}
char const *TOOLS_VERSION = "0.1.6";
}
//----------------------------------------------------------------
int main(int argc, char **argv)
{
int c;
flags fs;
const char shortopts[] = "qhV";
const struct option longopts[] = {
{ "quiet", no_argument, NULL, 'q'},
{ "help", no_argument, NULL, 'h'},
{ "version", no_argument, NULL, 'V'},
{ NULL, no_argument, NULL, 0 }
};
while ((c = getopt_long(argc, argv, shortopts, longopts, NULL)) != -1) {
switch(c) {
case 'h':
usage(cout, basename(argv[0]));
return 0;
case 'q':
fs.quiet_ = true;
break;
case 'V':
cout << TOOLS_VERSION << endl;
return 0;
default:
usage(cerr, basename(argv[0]));
return 1;
}
}
if (argc == optind) {
cerr << "No input file provided." << endl;
usage(cerr, basename(argv[0]));
return 1;
}
return check(argv[optind], fs);
}
//----------------------------------------------------------------