218 lines
4.0 KiB
C++
218 lines
4.0 KiB
C++
#include "metadata.h"
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#include <stdexcept>
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using namespace persistent_data;
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using namespace multisnap;
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//----------------------------------------------------------------
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namespace {
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typedef uint8_t __le8;
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typedef uint8_t __u8;
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typedef uint32_t __le32;
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typedef uint64_t __le64;
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uint32_t const SUPERBLOCK_MAGIC = 27022010;
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block_address const SUPERBLOCK_LOCATION = 0;
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uint32_t const VERSION = 1;
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unsigned const METADATA_CACHE_SIZE = 1024;
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unsigned const SECTOR_TO_BLOCK_SHIFT = 3;
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unsigned const SPACE_MAP_ROOT_SIZE = 128;
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struct multisnap_super_block {
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__le32 csum_;
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__le32 flags_;
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__le64 blocknr_; /* this block number, dm_block_t */
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__u8 uuid_[16];
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__le64 magic_;
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__le32 version_;
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__le32 time_;
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__le64 trans_id_;
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/* root for userspace's transaction (for migration and friends) */
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__le64 held_root_;
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__u8 data_space_map_root_[SPACE_MAP_ROOT_SIZE];
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__u8 metadata_space_map_root_[SPACE_MAP_ROOT_SIZE];
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/* 2 level btree mapping (dev_id, (dev block, time)) -> data block */
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__le64 data_mapping_root_;
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/* device detail root mapping dev_id -> device_details */
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__le64 device_details_root_;
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__le32 data_block_size_; /* in 512-byte sectors */
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__le32 metadata_block_size_; /* in 512-byte sectors */
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__le64 metadata_nr_blocks_;
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__le32 compat_flags_;
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__le32 incompat_flags_;
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} __attribute__ ((packed));
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struct device_details {
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__le64 dev_size_;
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__le64 mapped_blocks_;
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__le64 transaction_id_; /* when created */
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__le32 creation_time_;
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__le32 snapshotted_time_;
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} __attribute__ ((packed));
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}
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//----------------------------------------------------------------
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metadata::thin::maybe_address
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metadata::thin::lookup(block_address thin_block)
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{
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uint64_t key[2] = {dev_, thin_block};
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return metadata_->mappings_.lookup(key);
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}
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void
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metadata::thin::insert(block_address thin_block, block_address data_block)
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{
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uint64_t key[2] = {dev_, thin_block};
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return metadata_->mappings_.insert(key, data_block);
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}
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void
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metadata::thin::remove(block_address thin_block)
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{
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uint64_t key[2] = {dev_, thin_block};
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metadata_->mappings_.remove(key);
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}
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#if 0
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//--------------------------------
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metadata::metadata(std::string const &metadata_dev,
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sector_t data_block_size,
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block_address nr_data_blocks)
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{
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}
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metadata::~metadata()
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{
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}
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void
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metadata::commit()
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{
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}
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#endif
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void
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metadata::create_thin(dev_t dev)
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{
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uint64_t key[1] = {dev};
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if (device_exists(dev))
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throw std::runtime_error("Device already exists");
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single_mapping_tree::ptr new_tree(new single_mapping_tree(tm_));
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mappings_top_level_.insert(key, new_tree->get_root());
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mappings_.set_root(mappings_top_level_.get_root()); // FIXME: ugly
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}
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void
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metadata::create_snap(dev_t dev, dev_t origin)
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{
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uint64_t snap_key[1] = {dev};
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uint64_t origin_key[1] = {origin};
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auto mtree_root = mappings_top_level_.lookup(origin_key);
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if (!mtree_root)
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throw std::runtime_error("unknown origin");
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single_mapping_tree otree(tm_, *mtree_root);
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single_mapping_tree::ptr clone(otree.clone());
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mappings_top_level_.insert(snap_key, clone->get_root());
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mappings_.set_root(mappings_top_level_.get_root()); // FIXME: ugly
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time_++;
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auto o = open(origin);
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auto s = open(dev);
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o->set_snapshot_time(time_);
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s->set_snapshot_time(time_);
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s->set_mapped_blocks(o->get_mapped_blocks());
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}
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void
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metadata::del(dev_t dev)
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{
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uint64_t key[1] = {dev};
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mappings_top_level_.remove(key);
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}
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#if 0
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void
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metadata::set_transaction_id(uint64_t id)
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{
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}
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uint64_t
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metadata::get_transaction_id() const
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{
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}
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block_address
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metadata::get_held_root() const
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{
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}
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thin_ptr
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metadata::open_device(dev_t)
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{
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}
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block_address
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metadata::alloc_data_block()
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{
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}
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void
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metadata::free_data_block(block_address b)
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{
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}
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block_address
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metadata::get_nr_free_data_blocks() const
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{
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}
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sector_t
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metadata::get_data_block_size() const
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{
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}
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block_address
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metadata::get_data_dev_size() const
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{
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}
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#endif
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bool
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metadata::device_exists(dev_t dev) const
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{
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uint64_t key[1] = {dev};
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auto mval = details_.lookup(key);
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return mval;
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}
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//----------------------------------------------------------------
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