122 lines
2.9 KiB
C++
122 lines
2.9 KiB
C++
#include "caching/restore_emitter.h"
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#include "caching/superblock.h"
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#include "caching/mapping_array.h"
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using namespace caching;
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using namespace std;
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using namespace superblock_damage;
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//----------------------------------------------------------------
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namespace {
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class restorer : public emitter {
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public:
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restorer(metadata::ptr md, bool clean_shutdown, unsigned metadata_version)
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: md_(md),
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clean_shutdown_(clean_shutdown),
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metadata_version_(metadata_version) {
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}
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virtual void begin_superblock(std::string const &uuid,
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pd::block_address block_size,
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pd::block_address nr_cache_blocks,
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std::string const &policy,
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size_t hint_width) {
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superblock &sb = md_->sb_;
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sb.version = metadata_version_;
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strncpy((char *) sb.policy_name, policy.c_str(), sizeof(sb.policy_name) - 1);
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memset(sb.policy_version, 0, sizeof(sb.policy_version)); // FIXME: should come from xml
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sb.policy_hint_size = hint_width;
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md_->setup_hint_array(hint_width);
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sb.data_block_size = block_size;
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sb.cache_blocks = nr_cache_blocks;
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struct mapping unmapped_value;
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unmapped_value.oblock_ = 0;
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unmapped_value.flags_ = 0;
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md_->mappings_->grow(nr_cache_blocks, unmapped_value);
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if (metadata_version_ > 1)
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// make everything dirty by default
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md_->dirty_bits_->grow(nr_cache_blocks, true);
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vector<unsigned char> hint_value(hint_width, '\0');
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md_->hints_->grow(nr_cache_blocks, hint_value);
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}
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virtual void end_superblock() {
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md_->commit(clean_shutdown_);
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}
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virtual void begin_mappings() {
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// noop
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}
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virtual void end_mappings() {
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// noop
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}
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virtual void mapping(pd::block_address cblock,
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pd::block_address oblock,
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bool dirty) {
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caching::mapping m;
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m.oblock_ = oblock;
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m.flags_ = M_VALID;
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if (metadata_version_ == 1) {
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if (dirty)
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m.flags_ = m.flags_ | M_DIRTY;
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} else
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md_->dirty_bits_->set(cblock, dirty);
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md_->mappings_->set(cblock, m);
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}
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virtual void begin_hints() {
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// noop
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}
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virtual void end_hints() {
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// noop
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}
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virtual void hint(pd::block_address cblock,
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vector<unsigned char> const &data) {
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md_->hints_->set_hint(cblock, data);
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}
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virtual void begin_discards() {
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// noop
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}
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virtual void end_discards() {
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// noop
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}
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virtual void discard(block_address dblock, block_address dblock_e) {
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while (dblock != dblock_e) {
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md_->discard_bits_->set(dblock, true);
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dblock++;
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}
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}
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private:
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metadata::ptr md_;
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bool clean_shutdown_;
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unsigned metadata_version_;
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};
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}
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//----------------------------------------------------------------
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emitter::ptr
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caching::create_restore_emitter(metadata::ptr md, unsigned metadata_version,
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shutdown_type st)
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{
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return emitter::ptr(new restorer(md, st == CLEAN_SHUTDOWN, metadata_version));
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}
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//----------------------------------------------------------------
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