119 lines
3.1 KiB
C++
119 lines
3.1 KiB
C++
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#include "era/superblock.h"
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#include "persistent-data/checksum.h"
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using namespace base;
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using namespace era;
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using namespace persistent_data;
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//----------------------------------------------------------------
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namespace {
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using namespace base;
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struct superblock_disk {
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le32 csum;
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le32 flags;
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le64 blocknr;
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__u8 uuid[16];
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le64 magic;
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le32 version;
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le32 data_block_size;
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le32 metadata_block_size;
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le32 nr_blocks;
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le32 current_era;
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era_detail_disk current_detail;
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le64 bloom_filters_root;
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le64 era_array_root;
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} __attribute__ ((packed));
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struct superblock_traits {
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typedef superblock_disk disk_type;
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typedef superblock value_type;
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static void unpack(disk_type const &disk, value_type &value);
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static void pack(value_type const &value, disk_type &disk);
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};
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uint32_t const SUPERBLOCK_MAGIC = 2126579579;
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uint32_t const VERSION_BEGIN = 1;
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uint32_t const VERSION_END = 2;
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}
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//----------------------------------------------------------------
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superblock::superblock()
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: csum(0),
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blocknr(0),
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flags(),
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magic(SUPERBLOCK_MAGIC),
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version(VERSION_END - 1),
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data_block_size(0),
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metadata_block_size(8),
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nr_blocks(0),
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current_era(0),
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era_root(0),
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era_array_root(0)
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{
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memset(uuid, 0, sizeof(uuid));
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memset(metadata_space_map_root, 0, sizeof(metadata_space_map_root));
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}
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//----------------------------------------------------------------
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namespace validator {
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using namespace persistent_data;
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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 = 146538381;
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// FIXME: turn into a template, we have 3 similar classes now
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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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block_manager<>::validator::ptr mk_v() {
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return block_manager<>::validator::ptr(new sb_validator);
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}
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}
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//----------------------------------------------------------------
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superblock
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era::read_superblock(block_manager<>::ptr bm, block_address location)
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{
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superblock sb;
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block_manager<>::read_ref r = bm->read_lock(location, validator::mk_v());
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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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void
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era::write_superblock(block_manager<>::ptr bm, superblock const &sb, block_address location)
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{
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block_manager<>::write_ref w = bm->superblock_zero(location, validator::mk_v());
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superblock_traits::pack(sb, *reinterpret_cast<superblock_disk *>(w.data().raw()));
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}
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//----------------------------------------------------------------
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