thin-provisioning-tools/thin-provisioning/thin_generate_metadata.cc

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// Copyright (C) 2016 Red Hat, Inc. All rights reserved.
//
// 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/output_file_requirements.h"
#include "persistent-data/file_utils.h"
#include "thin-provisioning/commands.h"
#include "thin-provisioning/thin_pool.h"
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#include "version.h"
#include <boost/optional.hpp>
#include <getopt.h>
#include <unistd.h>
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using namespace boost;
using namespace thin_provisioning;
//----------------------------------------------------------------
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namespace {
struct flags {
enum metadata_operations {
METADATA_OP_NONE,
METADATA_OP_FORMAT,
METADATA_OP_OPEN,
METADATA_OP_CREATE_THIN,
METADATA_OP_CREATE_SNAP,
METADATA_OP_LAST
};
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flags()
: op(METADATA_OP_NONE),
data_block_size(128),
nr_data_blocks(10240)
{
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}
bool check_conformance();
metadata_operations op;
sector_t data_block_size;
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block_address nr_data_blocks;
optional<thin_dev_t> dev_id;
optional<thin_dev_t> origin;
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optional<string> output;
};
// FIXME: modulize the conditions
bool flags::check_conformance() {
if (op == METADATA_OP_NONE || op >= METADATA_OP_LAST) {
cerr << "Invalid operation." << endl;
return false;
}
if (!output) {
cerr << "No output file provided." << endl;
return false;
} else
check_output_file_requirements(*output);
if (op == METADATA_OP_CREATE_THIN && !dev_id) {
cerr << "no device id provided." << endl;
return false;
}
if (op == METADATA_OP_CREATE_SNAP && (!dev_id || !origin)) {
cerr << "no device id provided." << endl;
return false;
}
return true;
}
//--------------------------------
thin_pool::ptr open_or_create_pool(flags const &fs) {
block_manager::ptr bm = open_bm(*fs.output, block_manager::READ_WRITE);
if (fs.op == flags::METADATA_OP_FORMAT)
return thin_pool::ptr(new thin_pool(bm, fs.data_block_size, fs.nr_data_blocks));
else
return thin_pool::ptr(new thin_pool(bm));
}
int generate_metadata(flags const &fs) {
thin_pool::ptr pool = open_or_create_pool(fs);
switch (fs.op) {
case flags::METADATA_OP_CREATE_THIN:
pool->create_thin(*fs.dev_id);
break;
case flags::METADATA_OP_CREATE_SNAP:
pool->create_snap(*fs.dev_id, *fs.origin);
break;
default:
break;
}
pool->commit();
return 0;
}
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}
//----------------------------------------------------------------
thin_generate_metadata_cmd::thin_generate_metadata_cmd()
: command("thin_generate_metadata")
{
}
void
thin_generate_metadata_cmd::usage(std::ostream &out) const
{
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out << "Usage: " << get_name() << " [options]\n"
<< "Options:\n"
<< " {-h|--help}\n"
<< " {--format}\n"
<< " {--create-thin} <dev-id>\n"
<< " {--create-snap} <dev-id>\n"
<< " {--data-block-size} <block size>\n"
<< " {--nr-data-blocks} <nr>\n"
<< " {--origin} <origin-id>\n"
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<< " {-o|--output} <output device or file>\n"
<< " {-V|--version}" << endl;
}
int
thin_generate_metadata_cmd::run(int argc, char **argv)
{
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int c;
struct flags fs;
const char *shortopts = "hi:o:qV";
const struct option longopts[] = {
{ "help", no_argument, NULL, 'h' },
{ "output", required_argument, NULL, 'o' },
{ "format", no_argument, NULL, 1 },
{ "open", no_argument, NULL, 2 },
{ "create-thin", required_argument, NULL, 3 },
{ "create-snap", required_argument, NULL, 4 },
{ "data-block-size", required_argument, NULL, 101 },
{ "nr-data-blocks", required_argument, NULL, 102 },
{ "origin", required_argument, NULL, 401 },
{ "version", no_argument, NULL, 'V' },
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{ 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.op = flags::METADATA_OP_FORMAT;
break;
case 2:
fs.op = flags::METADATA_OP_OPEN;
break;
case 3:
fs.op = flags::METADATA_OP_CREATE_THIN;
fs.dev_id = parse_uint64(optarg, "device id");
break;
case 4:
fs.op = flags::METADATA_OP_CREATE_SNAP;
fs.dev_id = parse_uint64(optarg, "device id");
break;
case 101:
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fs.data_block_size = parse_uint64(optarg, "data block size");
break;
case 102:
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fs.nr_data_blocks = parse_uint64(optarg, "nr data blocks");
break;
case 401:
fs.origin = parse_uint64(optarg, "origin");
break;
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case 'V':
cout << THIN_PROVISIONING_TOOLS_VERSION << endl;
return 0;
default:
usage(cerr);
return 1;
}
}
if (!fs.check_conformance()) {
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usage(cerr);
return 1;
}
return generate_metadata(fs);
}
//----------------------------------------------------------------