thin-provisioning-tools/caching/restore_emitter.cc

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