[thin_show_duplicates] wip
This commit is contained in:
Joe Thornber
parent
5f11f5af99
commit
d954f230fa
@ -25,6 +25,7 @@
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#include "base/application.h"
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#include "base/error_state.h"
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#include "base/progress_monitor.h"
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#include "persistent-data/data-structures/btree_damage_visitor.h"
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#include "persistent-data/file_utils.h"
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#include "persistent-data/space-maps/core.h"
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#include "persistent-data/space-maps/disk.h"
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@ -32,18 +33,27 @@
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#include "thin-provisioning/device_tree.h"
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#include "thin-provisioning/mapping_tree.h"
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#include "thin-provisioning/superblock.h"
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#include "thin-provisioning/rmap_visitor.h"
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#include <boost/uuid/sha1.hpp>
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#include <boost/lexical_cast.hpp>
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#include <boost/optional.hpp>
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#include <vector>
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using namespace base;
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using namespace boost;
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using namespace persistent_data;
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using namespace std;
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using namespace thin_provisioning;
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//----------------------------------------------------------------
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namespace {
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bool factor_of(block_address f, block_address n) {
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cerr << n << " % " << f << "\n";
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return (n % f) == 0;
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}
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block_manager<>::ptr
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open_bm(string const &path) {
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block_address nr_blocks = get_nr_blocks(path);
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@ -74,13 +84,21 @@ namespace {
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//--------------------------------
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struct data_block {
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block_address begin, end;
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void *data;
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};
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//--------------------------------
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struct flags {
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flags()
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: block_size(512 * 1024),
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cache_mem(64 * 1024 * 1024) {
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: cache_mem(64 * 1024 * 1024) {
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}
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unsigned block_size;
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string data_dev;
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optional<string> metadata_dev;
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optional<unsigned> block_size;
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unsigned cache_mem;
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};
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@ -93,6 +111,38 @@ namespace {
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return fd;
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}
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// FIXME: introduce abstraction for a stream of segments
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using namespace mapping_tree_detail;
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typedef rmap_visitor::region region;
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typedef rmap_visitor::rmap_region rmap_region;
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class damage_visitor {
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public:
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virtual void visit(btree_path const &path, btree_detail::damage const &d) {
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throw std::runtime_error("damage in mapping tree, please run thin_check");
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}
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};
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// FIXME: too big to return by value
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vector<rmap_region> read_rmap(transaction_manager::ptr tm, superblock_detail::superblock const &sb,
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block_address nr_blocks) {
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damage_visitor dv;
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rmap_visitor rv;
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mapping_tree mtree(*tm, sb.data_mapping_root_,
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mapping_tree_detail::block_traits::ref_counter(tm->get_sm()));
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rv.add_data_region(rmap_visitor::region(0, nr_blocks));
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btree_visit_values(mtree, rv, dv);
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rv.complete();
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cerr << "rmap size: " << rv.get_rmap().size() << "\n";
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return rv.get_rmap();
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}
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class duplicate_counter {
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public:
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duplicate_counter(block_address nr_blocks)
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@ -101,7 +151,6 @@ namespace {
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}
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void add_duplicate(block_address b1, block_address b2) {
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// cout << "block " << b2 << " is a duplicate of " << b1 << "\n";
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total_dups_++;
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counts_[b1]++;
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}
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@ -153,10 +202,98 @@ namespace {
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duplicate_counter results_;
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};
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int show_dups(string const &path, flags const &fs) {
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cerr << "path = " << path << "\n";
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int show_dups_pool(flags const &fs) {
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block_manager<>::ptr bm = open_bm(*fs.metadata_dev);
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transaction_manager::ptr tm = open_tm(bm);
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superblock_detail::superblock sb = read_superblock(bm);
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block_address block_size = sb.data_block_size_ * 512;
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#if 0
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if (fs.block_size) {
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if (!factor_of(*fs.block_size, sb.data_block_size_ * 512))
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throw runtime_error("specified block size must be a factor of the pool block size.");
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block_size = *fs.block_size;
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}
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#endif
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cerr << "path = " << fs.data_dev << "\n";
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cerr << "block size = " << block_size << "\n";
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block_address nr_blocks = get_nr_blocks(fs.data_dev, block_size);
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cerr << "nr_blocks = " << nr_blocks << "\n";
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cerr << "reading rmap...";
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vector<rmap_region> rmap = read_rmap(tm, sb, nr_blocks);
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cerr << "done\n";
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uint32_t const UNMAPPED = -1;
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vector<uint32_t> block_to_thin(nr_blocks, UNMAPPED);
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vector<rmap_region>::const_iterator it;
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set<uint32_t> thins;
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block_address nr_mapped = 0;
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for (it = rmap.begin(); it != rmap.end(); ++it) {
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rmap_region const &r = *it;
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for (block_address b = r.data_begin; b != r.data_end; b++)
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if (block_to_thin[b] == UNMAPPED) {
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nr_mapped++;
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block_to_thin[b] = r.thin_dev;
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}
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thins.insert(r.thin_dev);
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}
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cerr << nr_mapped << " mapped blocks\n";
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cerr << "there are " << thins.size() << " thin devices\n";
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// The cache uses a LRU eviction policy, which plays badly
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// with a sequential read. So we can't prefetch all the
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// blocks.
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// FIXME: add MRU policy to cache
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unsigned cache_blocks = (fs.cache_mem / block_size) / 2;
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int fd = open_file(fs.data_dev);
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sector_t block_sectors = block_size / 512;
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block_cache cache(fd, block_sectors, nr_blocks, fs.cache_mem);
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validator::ptr v(new bcache::noop_validator());
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duplicate_detector detector(block_size, nr_blocks);
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// warm up the cache
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for (block_address i = 0; i < cache_blocks; i++)
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cache.prefetch(i);
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auto_ptr<progress_monitor> pbar = create_progress_bar("Examining data");
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for (block_address i = 0; i < nr_blocks; i++) {
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if (block_to_thin[i] == UNMAPPED)
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continue;
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block_cache::block &b = cache.get(i, 0, v);
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block_address prefetch = i + cache_blocks;
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if (prefetch < nr_blocks)
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cache.prefetch(prefetch);
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detector.examine(b);
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b.put();
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if (!(i & 127))
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pbar->update_percent(i * 100 / nr_blocks);
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}
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pbar->update_percent(100);
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cout << "\n\ntotal dups: " << detector.get_total_duplicates() << endl;
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cout << (detector.get_total_duplicates() * 100) / nr_mapped << "% duplicates\n";
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return 0;
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}
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int show_dups_linear(flags const &fs) {
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if (!fs.block_size)
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// FIXME: this check should be moved to the switch parsing
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throw runtime_error("--block-sectors or --metadata-dev must be supplied");
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cerr << "path = " << fs.data_dev << "\n";
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cerr << "block size = " << fs.block_size << "\n";
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block_address nr_blocks = get_nr_blocks(path, fs.block_size);
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block_address nr_blocks = get_nr_blocks(fs.data_dev, *fs.block_size);
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cerr << "nr_blocks = " << nr_blocks << "\n";
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// The cache uses a LRU eviction policy, which plays badly
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@ -164,13 +301,13 @@ namespace {
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// blocks.
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// FIXME: add MRU policy to cache
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unsigned cache_blocks = (fs.cache_mem / fs.block_size) / 2;
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int fd = open_file(path);
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sector_t block_sectors = fs.block_size / 512;
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unsigned cache_blocks = (fs.cache_mem / *fs.block_size) / 2;
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int fd = open_file(fs.data_dev);
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sector_t block_sectors = *fs.block_size / 512;
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block_cache cache(fd, block_sectors, nr_blocks, fs.cache_mem);
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validator::ptr v(new bcache::noop_validator());
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duplicate_detector detector(fs.block_size, nr_blocks);
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duplicate_detector detector(*fs.block_size, nr_blocks);
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// warm up the cache
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for (block_address i = 0; i < cache_blocks; i++)
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@ -189,6 +326,7 @@ namespace {
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pbar->update_percent(i * 100 / nr_blocks);
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}
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pbar->update_percent(100);
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cout << "\n\ntotal dups: " << detector.get_total_duplicates() << endl;
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cout << (detector.get_total_duplicates() * 100) / nr_blocks << "% duplicates\n";
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@ -196,10 +334,20 @@ namespace {
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return 0;
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}
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int show_dups(flags const &fs) {
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if (fs.metadata_dev)
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return show_dups_pool(fs);
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else {
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cerr << "No metadata device provided, so treating data device as a linear device\n";
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return show_dups_linear(fs);
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}
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}
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void usage(ostream &out, string const &cmd) {
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out << "Usage: " << cmd << " [options] {device|file}\n"
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<< "Options:\n"
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<< " {--block-sectors} <integer>\n"
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<< " {--metadata-dev} <path>\n"
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<< " {-h|--help}\n"
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<< " {-V|--version}" << endl;
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}
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@ -213,6 +361,7 @@ int thin_show_dups_main(int argc, char **argv)
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char const shortopts[] = "qhV";
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option const longopts[] = {
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{ "block-sectors", required_argument, NULL, 1},
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{ "metadata-dev", required_argument, NULL, 2},
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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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@ -232,6 +381,10 @@ int thin_show_dups_main(int argc, char **argv)
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fs.block_size = 512 * parse_int(optarg, "block sectors");
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break;
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case 2:
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fs.metadata_dev = optarg;
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break;
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default:
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usage(cerr, basename(argv[0]));
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return 1;
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@ -239,12 +392,14 @@ int thin_show_dups_main(int argc, char **argv)
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}
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if (argc == optind) {
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cerr << "No input file provided." << endl;
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cerr << "No data device/file provided." << endl;
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usage(cerr, basename(argv[0]));
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exit(1);
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}
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return show_dups(argv[optind], fs);
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fs.data_dev = argv[optind];
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return show_dups(fs);
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}
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base::command thin_provisioning::thin_show_dups_cmd("thin_show_duplicates", thin_show_dups_main);
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