[thin_generate_metadata] Preparation for revising the features
This commit is contained in:
Ming-Hung Tsai
parent
128ecc27f2
commit
0c6d132774
@ -17,24 +17,12 @@
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// <http://www.gnu.org/licenses/>.
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#include "base/output_file_requirements.h"
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#include "persistent-data/file_utils.h"
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#include "thin-provisioning/commands.h"
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#include "thin-provisioning/emitter.h"
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#include "thin-provisioning/human_readable_format.h"
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#include "thin-provisioning/metadata.h"
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#include "thin-provisioning/restore_emitter.h"
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#include "thin-provisioning/xml_format.h"
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#include "version.h"
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#include <boost/optional.hpp>
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#include <fstream>
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#include <getopt.h>
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#include <iostream>
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#include <libgen.h>
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#include <linux/fs.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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using namespace boost;
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@ -48,78 +36,14 @@ namespace {
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struct flags {
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flags()
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: data_block_size(128),
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nr_data_blocks(10240),
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nr_thins(1),
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blocks_per_thin(1024),
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run_lengths(1024) {
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nr_data_blocks(10240)
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{
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}
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block_address data_block_size;
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block_address nr_data_blocks;
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unsigned nr_thins;
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block_address blocks_per_thin;
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block_address run_lengths;
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optional<string> output;
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};
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// This is how we stir in some entropy. It mixes up the data
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// device.
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class shuffler {
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public:
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shuffler(block_address nr_blocks, unsigned run_lengths)
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: nr_blocks_(nr_blocks / run_lengths),
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run_lengths_(run_lengths) {
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}
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block_address map(block_address b) const {
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return reverse(b / run_lengths_) + (b % run_lengths_);
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}
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private:
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block_address reverse(block_address b) const {
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return nr_blocks_ - b - 1ull;
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}
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block_address nr_blocks_;
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block_address run_lengths_;
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};
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void generate_device(emitter::ptr e, shuffler const &s, uint32_t dev_id,
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block_address nr_blocks, block_address base) {
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e->begin_device(dev_id, nr_blocks, 0, 0, 0);
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for (unsigned b = 0; b < nr_blocks; b++)
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e->single_map(b, s.map(base + b), 0);
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e->end_device();
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}
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void generate_metadata(flags const &fs, emitter::ptr e) {
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e->begin_superblock("fake metadata", 0, 0, optional<uint32_t>(), optional<uint32_t>(),
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fs.data_block_size, fs.nr_data_blocks, optional<uint64_t>());
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shuffler s(fs.nr_data_blocks, fs.run_lengths);
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for (unsigned i = 0; i < fs.nr_thins; i++)
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generate_device(e, s, i, fs.blocks_per_thin, i * fs.blocks_per_thin);
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e->end_superblock();
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}
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int create_metadata(flags const &fs) {
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try {
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// The block size gets updated by the restorer.
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block_manager::ptr bm(open_bm(*fs.output, block_manager::READ_WRITE));
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metadata::ptr md(new metadata(bm, metadata::CREATE, 128, 0));
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emitter::ptr restorer = create_restore_emitter(md);
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generate_metadata(fs, restorer);
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} catch (std::exception &e) {
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cerr << e.what() << endl;
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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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//----------------------------------------------------------------
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@ -137,9 +61,6 @@ thin_generate_metadata_cmd::usage(std::ostream &out) const
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<< " {-h|--help}\n"
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<< " --data-block-size <block size>\n"
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<< " --nr-data-blocks <nr>\n"
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<< " --nr-thins <count>\n"
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<< " --blocks-per-thin <count>\n"
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<< " --run-lengths <count>\n"
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<< " {-o|--output} <output device or file>\n"
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<< " {-V|--version}" << endl;
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}
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@ -153,11 +74,8 @@ thin_generate_metadata_cmd::run(int argc, char **argv)
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const struct option longopts[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "output", required_argument, NULL, 'o' },
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{ "data-block-size", required_argument, NULL, 1},
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{ "nr-data-blocks", required_argument, NULL, 2},
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{ "nr-thins", required_argument, NULL, 3},
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{ "blocks-per-thin", required_argument, NULL, 4},
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{ "run-lengths", required_argument, NULL, 5},
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{ "data-block-size", required_argument, NULL, 101 },
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{ "nr-data-blocks", required_argument, NULL, 102 },
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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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@ -172,26 +90,14 @@ thin_generate_metadata_cmd::run(int argc, char **argv)
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fs.output = optarg;
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break;
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case 1:
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case 101:
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fs.data_block_size = parse_uint64(optarg, "data block size");
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break;
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case 2:
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case 102:
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fs.nr_data_blocks = parse_uint64(optarg, "nr data blocks");
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break;
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case 3:
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fs.nr_thins = parse_uint64(optarg, "nr thins");
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break;
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case 4:
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fs.blocks_per_thin = parse_uint64(optarg, "blocks per thin");
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break;
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case 5:
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fs.run_lengths = parse_uint64(optarg, "run lengths");
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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 0;
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@ -209,7 +115,7 @@ thin_generate_metadata_cmd::run(int argc, char **argv)
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} else
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check_output_file_requirements(*fs.output);
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return create_metadata(fs);
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return 0;
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}
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//----------------------------------------------------------------
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