178 lines
5.6 KiB
C++
178 lines
5.6 KiB
C++
#include "caching/superblock.h"
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using namespace caching;
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using namespace superblock_detail;
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//----------------------------------------------------------------
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void
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superblock_traits::unpack(superblock_disk const &disk, superblock &core)
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{
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core.csum = to_cpu<uint32_t>(disk.csum);
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core.flags = to_cpu<uint32_t>(disk.flags);
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core.blocknr = to_cpu<uint64_t>(disk.blocknr);
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::memcpy(core.uuid, disk.uuid, sizeof(core.uuid));
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core.magic = to_cpu<uint64_t>(disk.magic);
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core.version = to_cpu<uint32_t>(disk.version);
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::memcpy(core.policy_name, disk.policy_name, sizeof(core.policy_name));
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for (unsigned i = 0; i < CACHE_POLICY_VERSION_SIZE; i++)
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core.policy_version[i] = to_cpu<uint32_t>(disk.policy_version[i]);
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core.policy_hint_size = to_cpu<uint32_t>(disk.policy_hint_size);
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::memcpy(core.metadata_space_map_root,
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disk.metadata_space_map_root,
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sizeof(core.metadata_space_map_root));
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core.mapping_root = to_cpu<uint64_t>(disk.mapping_root);
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core.hint_root = to_cpu<uint64_t>(disk.hint_root);
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core.discard_root = to_cpu<uint64_t>(disk.discard_root);
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core.discard_block_size = to_cpu<uint64_t>(disk.discard_block_size);
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core.discard_nr_blocks = to_cpu<uint64_t>(disk.discard_nr_blocks);
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core.data_block_size = to_cpu<uint32_t>(disk.data_block_size);
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core.metadata_block_size = to_cpu<uint32_t>(disk.metadata_block_size);
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core.cache_blocks = to_cpu<uint32_t>(disk.cache_blocks);
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core.compat_flags = to_cpu<uint32_t>(disk.compat_flags);
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core.compat_ro_flags = to_cpu<uint32_t>(disk.compat_ro_flags);
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core.incompat_flags = to_cpu<uint32_t>(disk.incompat_flags);
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core.read_hits = to_cpu<uint32_t>(disk.read_hits);
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core.read_misses = to_cpu<uint32_t>(disk.read_misses);
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core.write_hits = to_cpu<uint32_t>(disk.write_hits);
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core.write_misses = to_cpu<uint32_t>(disk.write_misses);
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}
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void
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superblock_traits::pack(superblock const &core, superblock_disk &disk)
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{
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disk.csum = to_disk<le32>(core.csum);
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disk.flags = to_disk<le32>(core.flags);
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disk.blocknr = to_disk<le64>(core.blocknr);
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::memcpy(disk.uuid, core.uuid, sizeof(disk.uuid));
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disk.magic = to_disk<le64>(core.magic);
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disk.version = to_disk<le32>(core.version);
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::memcpy(disk.policy_name, core.policy_name, sizeof(disk.policy_name));
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for (unsigned i = 0; i < CACHE_POLICY_VERSION_SIZE; i++)
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disk.policy_version[i] = to_disk<le32>(core.policy_version[i]);
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disk.policy_hint_size = to_disk<le32>(core.policy_hint_size);
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::memcpy(disk.metadata_space_map_root,
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core.metadata_space_map_root,
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sizeof(disk.metadata_space_map_root));
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disk.mapping_root = to_disk<le64>(core.mapping_root);
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disk.hint_root = to_disk<le64>(core.hint_root);
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disk.discard_root = to_disk<le64>(core.discard_root);
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disk.discard_block_size = to_disk<le64>(core.discard_block_size);
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disk.discard_nr_blocks = to_disk<le64>(core.discard_nr_blocks);
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disk.data_block_size = to_disk<le32>(core.data_block_size);
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disk.metadata_block_size = to_disk<le32>(core.metadata_block_size);
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disk.cache_blocks = to_disk<le32>(core.cache_blocks);
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disk.compat_flags = to_disk<le32>(core.compat_flags);
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disk.compat_ro_flags = to_disk<le32>(core.compat_ro_flags);
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disk.incompat_flags = to_disk<le32>(core.incompat_flags);
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disk.read_hits = to_disk<le32>(core.read_hits);
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disk.read_misses = to_disk<le32>(core.read_misses);
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disk.write_hits = to_disk<le32>(core.write_hits);
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disk.write_misses = to_disk<le32>(core.write_misses);
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}
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//--------------------------------
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superblock_corruption::superblock_corruption(std::string const &desc)
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: desc_(desc)
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{
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}
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void
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superblock_corruption::visit(damage_visitor &v) const
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{
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v.visit(*this);
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}
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//--------------------------------
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namespace {
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using namespace persistent_data;
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using namespace superblock_detail;
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uint32_t const VERSION = 1;
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unsigned const SECTOR_TO_BLOCK_SHIFT = 3;
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uint32_t const SUPERBLOCK_CSUM_SEED = 9031977;
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struct sb_validator : public block_manager<>::validator {
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virtual void check(buffer<> const &b, block_address location) const {
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superblock_disk const *sbd = reinterpret_cast<superblock_disk const *>(&b);
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crc32c sum(SUPERBLOCK_CSUM_SEED);
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sum.append(&sbd->flags, MD_BLOCK_SIZE - sizeof(uint32_t));
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if (sum.get_sum() != to_cpu<uint32_t>(sbd->csum))
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throw checksum_error("bad checksum in superblock");
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}
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virtual void prepare(buffer<> &b, block_address location) const {
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superblock_disk *sbd = reinterpret_cast<superblock_disk *>(&b);
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crc32c sum(SUPERBLOCK_CSUM_SEED);
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sum.append(&sbd->flags, MD_BLOCK_SIZE - sizeof(uint32_t));
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sbd->csum = to_disk<base::le32>(sum.get_sum());
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}
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};
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}
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persistent_data::block_manager<>::validator::ptr
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caching::superblock_validator()
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{
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return block_manager<>::validator::ptr(new sb_validator);
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}
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//--------------------------------
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superblock_detail::superblock
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caching::read_superblock(persistent_data::block_manager<>::ptr bm,
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persistent_data::block_address location)
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{
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using namespace superblock_detail;
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superblock sb;
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block_manager<>::read_ref r = bm->read_lock(location, superblock_validator());
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superblock_disk const *sbd = reinterpret_cast<superblock_disk const *>(&r.data());
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superblock_traits::unpack(*sbd, sb);
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return sb;
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}
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superblock_detail::superblock
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caching::read_superblock(persistent_data::block_manager<>::ptr bm)
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{
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return read_superblock(bm, SUPERBLOCK_LOCATION);
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}
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void
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caching::check_superblock(persistent_data::block_manager<>::ptr bm,
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superblock_detail::damage_visitor &visitor)
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{
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using namespace superblock_detail;
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try {
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bm->read_lock(SUPERBLOCK_LOCATION, superblock_validator());
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} catch (std::exception const &e) {
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visitor.visit(superblock_corruption(e.what()));
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}
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}
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//----------------------------------------------------------------
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