160 lines
3.8 KiB
C++
160 lines
3.8 KiB
C++
#include "version.h"
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#include <boost/lexical_cast.hpp>
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#include <boost/optional.hpp>
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#include <iostream>
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#include <getopt.h>
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#include <stdint.h>
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#include <stdexcept>
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using namespace std;
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//----------------------------------------------------------------
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namespace {
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struct flags {
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flags()
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: max_hint_width(4) {
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}
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boost::optional<uint64_t> device_size;
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boost::optional<uint32_t> block_size;
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boost::optional<uint64_t> nr_blocks;
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uint32_t max_hint_width;
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};
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void usage(ostream &out, string const &cmd) {
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out << "Usage: " << cmd << " [options]" << endl
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<< "Options:" << endl
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<< " {-h|--help}" << endl
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<< " {-V|--version}" << endl
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<< " {--block-size <sectors>}" << endl
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<< " {--device-size <sectors>}" << endl
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<< " {--nr-blocks <natural>}" << endl << endl
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<< "These all relate to the size of the fast device (eg, SSD), rather" << endl
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<< "than the whole cached device." << endl;
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}
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enum parse_result {
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FINISH,
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CONTINUE
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};
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parse_result parse_command_line(string const &prog_name, int argc, char **argv, flags &fs) {
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int c;
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char const short_opts[] = "hV";
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option const long_opts[] = {
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{ "block-size", required_argument, NULL, 0 },
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{ "device-size", required_argument, NULL, 1 },
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{ "nr-blocks", required_argument, NULL, 2 },
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{ "max-hint-width", required_argument, NULL, 3 },
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, 'V' },
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{ NULL, no_argument, NULL, 0 }
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};
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while ((c = getopt_long(argc, argv, short_opts, long_opts, NULL)) != -1) {
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switch (c) {
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case 0:
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fs.block_size = boost::lexical_cast<uint32_t>(optarg);
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break;
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case 1:
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fs.device_size = boost::lexical_cast<uint64_t>(optarg);
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break;
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case 2:
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fs.nr_blocks = boost::lexical_cast<uint64_t>(optarg);
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break;
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case 3:
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fs.max_hint_width = boost::lexical_cast<uint32_t>(optarg);
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break;
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case 'h':
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usage(cout, prog_name);
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return FINISH;
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break;
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case 'V':
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cout << THIN_PROVISIONING_TOOLS_VERSION << endl;
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return FINISH;
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break;
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default:
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usage(cerr, prog_name);
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throw runtime_error("Invalid command line");
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break;
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}
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}
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return CONTINUE;
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}
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uint64_t get_nr_blocks(flags &fs) {
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if (fs.device_size) {
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if (!fs.block_size)
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throw runtime_error("If you specify --device-size you must also give --block-size.");
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uint64_t nr_blocks = *fs.device_size / *fs.block_size;
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if (fs.nr_blocks) {
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if (nr_blocks != *fs.nr_blocks)
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throw runtime_error(
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"Contradictory arguments given, --nr-blocks doesn't match the --device-size and --block-size.");
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}
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return nr_blocks;
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}
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if (fs.block_size && !fs.device_size)
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throw runtime_error("If you specify --block-size you must also give --device-size.");
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if (fs.nr_blocks)
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return *fs.nr_blocks;
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throw runtime_error("Please specify either --device-size and --block-size, or --nr-blocks.");
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}
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uint64_t meg(uint64_t n) {
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return n * 2048;
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}
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uint64_t calc_size(uint64_t nr_blocks, uint32_t max_hint_width) {
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uint64_t const SECTOR_SIZE = 512;
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uint64_t const TRANSACTION_OVERHEAD = meg(4);
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uint64_t const BYTES_PER_BLOCK = 16;
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uint64_t const HINT_OVERHEAD_PER_BLOCK = 8;
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uint64_t mapping_size = (nr_blocks * BYTES_PER_BLOCK) / SECTOR_SIZE;
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uint64_t hint_size = (nr_blocks * (max_hint_width + HINT_OVERHEAD_PER_BLOCK)) / SECTOR_SIZE;
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return TRANSACTION_OVERHEAD + mapping_size + hint_size;
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}
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}
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int main(int argc, char **argv)
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{
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flags fs;
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try {
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switch (parse_command_line(argv[0], argc, argv, fs)) {
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case FINISH:
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return 0;
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case CONTINUE:
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break;
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}
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uint64_t nr_blocks = get_nr_blocks(fs);
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cout << calc_size(nr_blocks, fs.max_hint_width) << " sectors" << endl;
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} catch (std::exception const &e) {
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cerr << e.what();
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return 1;
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}
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return 0;
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}
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//----------------------------------------------------------------
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