157 lines
3.4 KiB
C++
157 lines
3.4 KiB
C++
#include "caching/metadata.h"
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#include "caching/superblock.h"
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#include "persistent-data/space-maps/core.h"
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using namespace caching;
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namespace pd = persistent_data;
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//----------------------------------------------------------------
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namespace {
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unsigned const METADATA_CACHE_SIZE = 1024;
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// FIXME: duplication
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transaction_manager::ptr
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open_tm(block_manager<>::ptr bm) {
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auto nr_blocks = bm->get_nr_blocks();
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if (!nr_blocks)
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throw runtime_error("Metadata is not large enough for superblock.");
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space_map::ptr sm(new core_map(nr_blocks));
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sm->inc(SUPERBLOCK_LOCATION);
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transaction_manager::ptr tm(new transaction_manager(bm, sm));
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return tm;
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}
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void
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copy_space_maps(space_map::ptr lhs, space_map::ptr rhs) {
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for (block_address b = 0; b < rhs->get_nr_blocks(); b++) {
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uint32_t count = rhs->get_count(b);
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if (count > 0)
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lhs->set_count(b, rhs->get_count(b));
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}
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}
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}
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//----------------------------------------------------------------
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metadata::metadata(block_manager<>::ptr bm, open_type ot, unsigned metadata_version)
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{
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switch (ot) {
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case CREATE:
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create_metadata(bm, metadata_version);
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break;
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default:
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throw runtime_error("unhandled open_type");
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}
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}
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metadata::metadata(block_manager<>::ptr bm)
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{
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open_metadata(bm);
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}
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void
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metadata::commit(bool clean_shutdown)
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{
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commit_space_map();
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commit_mappings();
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commit_hints();
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commit_discard_bits();
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commit_superblock(clean_shutdown);
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}
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void
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metadata::setup_hint_array(size_t width)
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{
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if (width > 0)
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hints_ = hint_array::ptr(
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new hint_array(*tm_, width));
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}
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void
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metadata::create_metadata(block_manager<>::ptr bm, unsigned metadata_version)
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{
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tm_ = open_tm(bm);
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space_map::ptr core = tm_->get_sm();
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metadata_sm_ = create_metadata_sm(*tm_, tm_->get_bm()->get_nr_blocks());
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copy_space_maps(metadata_sm_, core);
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tm_->set_sm(metadata_sm_);
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mappings_ = mapping_array::ptr(new mapping_array(*tm_, mapping_array::ref_counter()));
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// We can't instantiate the hint array yet, since we don't know the
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// hint width.
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discard_bits_ = pd::bitset::ptr(new pd::bitset(*tm_));
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if (metadata_version >= 2)
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dirty_bits_ = pd::bitset::ptr(new pd::bitset(*tm_));
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}
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void
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metadata::open_metadata(block_manager<>::ptr bm)
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{
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tm_ = open_tm(bm);
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sb_ = read_superblock(tm_->get_bm());
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mappings_ = mapping_array::ptr(
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new mapping_array(*tm_,
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mapping_array::ref_counter(),
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sb_.mapping_root,
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sb_.cache_blocks));
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if (sb_.hint_root)
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hints_ = hint_array::ptr(
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new hint_array(*tm_, sb_.policy_hint_size,
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sb_.hint_root, sb_.cache_blocks));
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if (sb_.discard_root)
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discard_bits_ = pd::bitset::ptr(
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new pd::bitset(*tm_, sb_.discard_root, sb_.discard_nr_blocks));
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if (sb_.version >= 2)
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dirty_bits_ = pd::bitset::ptr(
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new pd::bitset(*tm_, *sb_.dirty_root, sb_.cache_blocks));
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}
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void
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metadata::commit_space_map()
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{
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metadata_sm_->commit();
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metadata_sm_->copy_root(&sb_.metadata_space_map_root, sizeof(sb_.metadata_space_map_root));
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}
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void
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metadata::commit_mappings()
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{
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sb_.mapping_root = mappings_->get_root();
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}
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void
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metadata::commit_hints()
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{
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sb_.hint_root = hints_->get_root();
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}
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void
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metadata::commit_discard_bits()
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{
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sb_.discard_root = discard_bits_->get_root();
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}
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void
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metadata::commit_superblock(bool clean_shutdown)
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{
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if (clean_shutdown)
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sb_.flags.set_flag(superblock_flags::CLEAN_SHUTDOWN);
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write_superblock(tm_->get_bm(), sb_);
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sb_.flags.clear_flag(superblock_flags::CLEAN_SHUTDOWN);
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}
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//----------------------------------------------------------------
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