99 lines
2.6 KiB
C++
99 lines
2.6 KiB
C++
#ifndef SPACE_MAP_DISK_STRUCTURES_H
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#define SPACE_MAP_DISK_STRUCTURES_H
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#include "endian_utils.h"
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#include "btree.h"
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//----------------------------------------------------------------
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namespace persistent_data {
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using namespace base;
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namespace sm_disk_detail {
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struct index_entry_disk {
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__le64 blocknr_;
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__le32 nr_free_;
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__le32 none_free_before_;
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} __attribute__ ((packed));
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struct index_entry {
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uint64_t blocknr_;
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uint32_t nr_free_;
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uint32_t none_free_before_;
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};
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struct index_entry_traits {
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typedef index_entry_disk disk_type;
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typedef index_entry value_type;
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typedef NoOpRefCounter<index_entry> ref_counter;
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static void unpack(disk_type const &disk, value_type &value) {
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value.blocknr_ = to_cpu<uint64_t>(disk.blocknr_);
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value.nr_free_ = to_cpu<uint32_t>(disk.nr_free_);
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value.none_free_before_ = to_cpu<uint32_t>(disk.none_free_before_);
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}
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static void pack(value_type const &value, disk_type &disk) {
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disk.blocknr_ = to_disk<__le64>(value.blocknr_);
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disk.nr_free_ = to_disk<__le32>(value.nr_free_);
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disk.none_free_before_ = to_disk<__le32>(value.none_free_before_);
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}
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};
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unsigned const MAX_METADATA_BITMAPS = 255;
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unsigned const ENTRIES_PER_BYTE = 4;
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struct metadata_index {
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__le32 csum_;
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__le32 padding_;
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__le64 blocknr_;
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struct index_entry_disk index[MAX_METADATA_BITMAPS];
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} __attribute__ ((packed));
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struct sm_root_disk {
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__le64 nr_blocks_;
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__le64 nr_allocated_;
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__le64 bitmap_root_;
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__le64 ref_count_root_;
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} __attribute__ ((packed));
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struct sm_root {
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uint64_t nr_blocks_;
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uint64_t nr_allocated_;
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uint64_t bitmap_root_;
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uint64_t ref_count_root_;
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};
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struct sm_root_traits {
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typedef sm_root_disk disk_type;
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typedef sm_root value_type;
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typedef NoOpRefCounter<sm_root> ref_counter;
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static void unpack(disk_type const &disk, value_type &value) {
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value.nr_blocks_ = to_cpu<uint64_t>(disk.nr_blocks_);
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value.nr_allocated_ = to_cpu<uint64_t>(disk.nr_allocated_);
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value.bitmap_root_ = to_cpu<uint64_t>(disk.bitmap_root_);
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value.ref_count_root_ = to_cpu<uint64_t>(disk.ref_count_root_);
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}
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static void pack(value_type const &value, disk_type &disk) {
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disk.nr_blocks_ = to_disk<__le64>(value.nr_blocks_);
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disk.nr_allocated_ = to_disk<__le64>(value.nr_allocated_);
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disk.bitmap_root_ = to_disk<__le64>(value.bitmap_root_);
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disk.ref_count_root_ = to_disk<__le64>(value.ref_count_root_);
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}
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};
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struct bitmap_header {
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__le32 csum;
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__le32 not_used;
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__le64 blocknr;
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} __attribute__ ((packed));
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}
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}
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//----------------------------------------------------------------
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#endif
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