thin-provisioning-tools/thin-provisioning/thin_generate_mappings.cc

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// 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 "base/io_generator.h"
#include "base/output_file_requirements.h"
#include "persistent-data/file_utils.h"
#include "thin-provisioning/commands.h"
#include "thin-provisioning/thin_pool.h"
#include "version.h"
#include <boost/optional.hpp>
#include <getopt.h>
#include <unistd.h>
using namespace boost;
using namespace thin_provisioning;
//----------------------------------------------------------------
namespace {
struct flags {
flags()
: pattern("write"),
offset(0)
{
}
bool check_conformance();
boost::optional<string> output;
base::io_pattern pattern;
boost::optional<unsigned> dev_id;
boost::optional<base::sector_t> block_size;
base::sector_t offset;
boost::optional<base::sector_t> size;
boost::optional<base::sector_t> io_size;
boost::optional<unsigned> nr_seq_blocks;
};
bool flags::check_conformance() {
if (!output) {
cerr << "No output file provided." << endl;
return false;
}
if (!dev_id) {
cerr << "No device id provided." << endl;
return false;
}
if (!size) {
cerr << "No device size specified" << endl;
return false;
}
if (nr_seq_blocks) {
if (!pattern.is_random()) {
cerr << "Cannot specify the sequence size"
" while doing non-random IO" << endl;
return false;
}
}
check_output_file_requirements(*output);
return true;
}
//--------------------------------
thin_pool::ptr open_pool(flags const &fs) {
block_manager::ptr bm = open_bm(*fs.output, block_manager::READ_WRITE);
return thin_pool::ptr(new thin_pool(bm));
}
int generate_mappings(flags const &fs) {
thin_pool::ptr pool = open_pool(fs);
thin::ptr td = pool->open_thin(*fs.dev_id);
io_generator_options opts;
opts.pattern_ = fs.pattern;
opts.block_size_ = !fs.block_size ?
pool->get_data_block_size() :
*fs.block_size;
opts.offset_ = fs.offset;
opts.size_ = *fs.size;
opts.io_size_ = !fs.io_size ? *fs.size : *fs.io_size;
opts.nr_seq_blocks_ = !fs.nr_seq_blocks ? 1 : *fs.nr_seq_blocks;
io_generator::ptr gen = create_io_generator(opts);
base::io io;
while (gen->next(io)) {
// TODO: support io.size_
switch (io.op_) {
case base::REQ_OP_READ:
process_read(td, pool, io.sector_);
break;
case base::REQ_OP_WRITE:
process_write(td, pool, io.sector_);
break;
case base::REQ_OP_DISCARD:
process_discard(td, pool, io.sector_);
break;
}
}
pool->commit();
return 0;
}
}
//----------------------------------------------------------------
thin_generate_mappings_cmd::thin_generate_mappings_cmd()
: command("thin_generate_mappings")
{
}
void
thin_generate_mappings_cmd::usage(std::ostream &out) const
{
out << "Usage: " << get_name() << " [options]\n"
<< "Options:\n"
<< " {-h|--help}\n"
<< " {-o|--output} <output device or file>\n"
<< " {--dev-id} <dev-id>\n"
<< " {--offset} <offset in sectors>\n"
<< " {--io-size} <io-size in sectors>\n"
<< " {--rw write|trim|randwrite|randtrim|randtw}\n"
<< " {--size} <size in sectors>\n"
<< " {--seq-nr} <max nr. of sequential ios>\n"
<< " {-V|--version}" << endl;
}
int
thin_generate_mappings_cmd::run(int argc, char **argv)
{
int c;
struct flags fs;
const char *shortopts = "ho:V";
const struct option longopts[] = {
{ "help", no_argument, NULL, 'h' },
{ "output", required_argument, NULL, 'o' },
{ "dev-id", required_argument, NULL, 1 },
{ "rw", required_argument, NULL, 2 },
{ "offset", required_argument, NULL, 3 },
{ "size", required_argument, NULL, 4 },
{ "io-size", required_argument, NULL, 5 },
{ "seq-nr", required_argument, NULL, 6 },
{ "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);
return 0;
case 'o':
fs.output = optarg;
break;
case 1:
fs.dev_id = parse_uint64(optarg, "dev_id");
break;
case 2:
fs.pattern.parse(optarg);
break;
case 3:
fs.offset = parse_uint64(optarg, "offset");
break;
case 4:
fs.size = parse_uint64(optarg, "size");
break;
case 5:
fs.io_size = parse_uint64(optarg, "io_size");
break;
case 6:
fs.nr_seq_blocks = parse_uint64(optarg, "seq_nr");
break;
case 'V':
cout << THIN_PROVISIONING_TOOLS_VERSION << endl;
return 0;
default:
usage(cerr);
return 1;
}
}
if (!fs.check_conformance()) {
usage(cerr);
return 1;
}
return generate_mappings(fs);
}
//----------------------------------------------------------------