thin-provisioning-tools/era/restore_emitter.cc

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#include "era/restore_emitter.h"
#include "era/superblock.h"
using namespace era;
using namespace persistent_data;
//----------------------------------------------------------------
namespace {
class restorer : public emitter {
public:
restorer(metadata &md)
: md_(md),
in_superblock_(false),
in_writeset_(false),
in_era_array_(false) {
}
virtual void begin_superblock(std::string const &uuid,
uint32_t data_block_size,
pd::block_address nr_blocks,
uint32_t current_era) {
superblock &sb = md_.sb_;
memcpy(sb.uuid, reinterpret_cast<__u8 const *>(uuid.c_str()),
min<size_t>(sizeof(sb.uuid), uuid.length()));
sb.data_block_size = data_block_size;
sb.nr_blocks = nr_blocks;
sb.current_era = current_era;
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md_.era_array_->grow(nr_blocks, 0);
in_superblock_ = true;
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}
virtual void end_superblock() {
if (!in_superblock_)
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throw runtime_error("xml missing superblock");
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md_.commit();
}
virtual void begin_writeset(uint32_t era, uint32_t nr_bits) {
if (!in_superblock_)
throw runtime_error("missing superblock");
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if (in_writeset_)
throw runtime_error("attempt to begin writeset when already in one");
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in_writeset_ = true;
era_ = era;
bits_.reset(new persistent_data::bitset(*md_.tm_));
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bits_->grow(nr_bits, false);
}
virtual void writeset_bit(uint32_t bit, bool value) {
bits_->set(bit, value);
}
virtual void end_writeset() {
in_writeset_ = false;
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bits_->flush();
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era_detail e;
e.nr_bits = bits_->get_nr_bits();
e.writeset_root = bits_->get_root();
uint64_t key[1] = {era_};
md_.writeset_tree_->insert(key, e);
}
virtual void begin_era_array() {
if (!in_superblock_)
throw runtime_error("missing superblock");
in_era_array_ = true;
}
virtual void era(pd::block_address block, uint32_t era) {
if (!in_era_array_)
throw runtime_error("missing era array");
md_.era_array_->set(block, era);
}
virtual void end_era_array() {
in_era_array_ = false;
}
private:
metadata &md_;
bool in_superblock_;
bool in_writeset_;
uint32_t era_;
pd::bitset::ptr bits_;
bool in_era_array_;
uint32_t nr_blocks_;
};
}
//----------------------------------------------------------------
emitter::ptr
era::create_restore_emitter(metadata &md)
{
return emitter::ptr(new restorer(md));
}
//----------------------------------------------------------------