thin-provisioning-tools/era/era_invalidate.cc

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#include <fstream>
#include <getopt.h>
#include <libgen.h>
#include <iostream>
#include "version.h"
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#include "base/indented_stream.h"
#include "era/era_array.h"
#include "era/writeset_tree.h"
#include "era/metadata.h"
#include "era/xml_format.h"
#include "persistent-data/file_utils.h"
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#include <boost/lexical_cast.hpp>
using namespace boost;
using namespace era;
using namespace std;
//----------------------------------------------------------------
namespace {
struct flags {
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flags()
: metadata_snapshot_(false) {
}
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bool metadata_snapshot_;
optional<uint32_t> era_threshold_;
};
//--------------------------------
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void walk_array(era_array const &array, uint32_t nr_blocks,
uint32_t threshold, set<uint32_t> &blocks) {
for (uint32_t b = 0; b < nr_blocks; b++) {
uint32_t era = array.get(b);
if (era >= threshold)
blocks.insert(b);
}
}
class writesets_marked_since : public writeset_tree_detail::writeset_visitor {
public:
writesets_marked_since(uint32_t threshold, set<uint32_t> &blocks)
: current_era_(0),
threshold_(threshold),
blocks_(blocks) {
}
void writeset_begin(uint32_t era, uint32_t nr_bits) {
current_era_ = era;
}
void bit(uint32_t index, bool value) {
if (value && current_era_ >= threshold_)
blocks_.insert(index);
}
void writeset_end() {
}
private:
uint32_t current_era_;
uint32_t threshold_;
set<uint32_t> &blocks_;
};
void raise_metadata_damage() {
throw std::runtime_error("metadata contains errors (run era_check for details).");
}
struct fatal_writeset_tree_damage : public writeset_tree_detail::damage_visitor {
void visit(writeset_tree_detail::missing_eras const &d) {
raise_metadata_damage();
}
void visit(writeset_tree_detail::damaged_writeset const &d) {
raise_metadata_damage();
}
};
void walk_writesets(metadata const &md, uint32_t threshold, set<uint32_t> &result) {
writesets_marked_since v(threshold, result);
fatal_writeset_tree_damage dv;
walk_writeset_tree(md.tm_, *md.writeset_tree_, v, dv);
}
void mark_blocks_since(metadata const &md, uint32_t threshold, set<uint32_t> &result) {
walk_array(*md.era_array_, md.sb_.nr_blocks, threshold, result);
walk_writesets(md, threshold, result);
}
//--------------------------------
template <typename Iterator>
pair<uint32_t, uint32_t> next_run(Iterator &it, Iterator end) {
uint32_t b, e;
b = *it++;
e = b + 1;
while (it != end && *it == e) {
e++;
it++;
}
return make_pair(b, e);
}
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void emit_blocks(ostream &out, set<uint32_t> const &blocks) {
indented_stream o(out);
o.indent();
o << "<blocks>" << endl;
o.inc();
{
set<uint32_t>::const_iterator it = blocks.begin();
while (it != blocks.end()) {
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o.indent();
pair<uint32_t, uint32_t> range = next_run(it, blocks.end());
if (range.second - range.first == 1)
o << "<block block=\"" << range.first << "\"/>" << endl;
else
o << "<range begin=\"" << range.first
<< "\" end = \"" << range.second << "\"/>" << endl;
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}
}
o.dec();
o.indent();
o << "</blocks>" << endl;
}
//--------------------------------
string const STDOUT_PATH("-");
bool want_stdout(string const &output) {
return output == STDOUT_PATH;
}
int invalidate(string const &dev, string const &output, flags const &fs) {
try {
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set<uint32_t> blocks;
block_manager<>::ptr bm = open_bm(dev, block_io<>::READ_ONLY);
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if (fs.metadata_snapshot_) {
superblock sb = read_superblock(bm);
if (!sb.metadata_snap)
throw runtime_error("no metadata snapshot taken.");
metadata::ptr md(new metadata(bm, *sb.metadata_snap));
mark_blocks_since(*md, *fs.era_threshold_, blocks);
} else {
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metadata::ptr md(new metadata(bm, metadata::OPEN));
mark_blocks_since(*md, *fs.era_threshold_, blocks);
}
if (want_stdout(output))
emit_blocks(cout, blocks);
else {
ofstream out(output.c_str());
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emit_blocks(out, blocks);
}
} catch (std::exception &e) {
cerr << e.what() << endl;
return 1;
}
return 0;
}
void usage(ostream &out, string const &cmd) {
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out << "Usage: " << cmd << " [options] --written-since <era> {device|file}" << endl
<< "Options:" << endl
<< " {-h|--help}" << endl
<< " {-o <xml file>}" << endl
<< " {-V|--version}" << endl;
}
}
//----------------------------------------------------------------
int main(int argc, char **argv)
{
int c;
flags fs;
string output("-");
char const shortopts[] = "ho:V";
option const longopts[] = {
{ "help", no_argument, NULL, 'h' },
{ "output", required_argument, NULL, 'o' },
{ "version", no_argument, NULL, 'V' },
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{ "metadata-snapshot", no_argument, NULL, 1},
{ "written-since", required_argument, NULL, 2},
{ NULL, no_argument, NULL, 0 }
};
while ((c = getopt_long(argc, argv, shortopts, longopts, NULL)) != -1) {
switch(c) {
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case 1:
fs.metadata_snapshot_ = true;
break;
case 2:
fs.era_threshold_ = lexical_cast<uint32_t>(optarg);
break;
case 'h':
usage(cout, basename(argv[0]));
return 0;
case 'o':
output = optarg;
break;
case 'V':
cout << THIN_PROVISIONING_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;
}
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if (!fs.era_threshold_) {
cerr << "Please specify --written-since" << endl;
usage(cerr, basename(argv[0]));
return 1;
}
return invalidate(argv[optind], output, fs);
}
//----------------------------------------------------------------