thin-provisioning-tools/caching/cache_dump.cc
Joe Thornber bb898eeaad [cache_restore/dump] hint_width work.
dump/restore cycle works again.
2013-09-26 11:36:01 +01:00

128 lines
2.8 KiB
C++

#include <fstream>
#include <getopt.h>
#include <libgen.h>
#include <iostream>
#include "version.h"
#include "caching/mapping_array.h"
#include "caching/metadata.h"
#include "caching/xml_format.h"
#include "persistent-data/file_utils.h"
using namespace std;
using namespace caching;
using namespace caching::mapping_array_detail;
using namespace caching::superblock_detail;
//----------------------------------------------------------------
namespace {
string to_string(unsigned char const *data) {
// FIXME: we're assuming the data is zero terminated here
return std::string(reinterpret_cast<char const *>(data));
}
//--------------------------------
string const STDOUT_PATH("-");
bool want_stdout(string const &output) {
return output == STDOUT_PATH;
}
int dump_(string const &dev, ostream &out) {
block_manager<>::ptr bm = open_bm(dev, block_io<>::READ_ONLY);
metadata::ptr md(new metadata(bm, metadata::OPEN));
emitter::ptr e = create_xml_emitter(out);
superblock const &sb = md->sb_;
e->begin_superblock(to_string(sb.uuid), sb.data_block_size,
sb.cache_blocks, to_string(sb.policy_name),
sb.policy_hint_size);
e->begin_mappings();
for (unsigned cblock = 0; cblock < sb.cache_blocks; cblock++) {
mapping m = md->mappings_->get(cblock);
if (m.flags_ & M_VALID)
e->mapping(cblock, m.oblock_, m.flags_ & M_DIRTY);
}
e->end_mappings();
e->end_superblock();
return 0;
}
int dump(string const &dev, string const &output) {
try {
if (want_stdout(output))
return dump_(dev, cout);
else {
ofstream out(output.c_str());
return dump_(dev, out);
}
} catch (std::exception &e) {
cerr << e.what() << endl;
return 1;
}
}
void usage(ostream &out, string const &cmd) {
out << "Usage: " << cmd << " [options] {device|file}" << endl
<< "Options:" << endl
<< " {-h|--help}" << endl
<< " {-o <xml file>}" << endl
<< " {-V|--version}" << endl;
}
}
//----------------------------------------------------------------
int main(int argc, char **argv)
{
int c;
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'},
{ 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 '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;
}
return dump(argv[optind], output);
}
//----------------------------------------------------------------