123 lines
3.6 KiB
C++
123 lines
3.6 KiB
C++
// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
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//
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// This file is part of the thin-provisioning-tools source.
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//
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// thin-provisioning-tools is free software: you can redistribute it
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// and/or modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation, either version 3 of
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// the License, or (at your option) any later version.
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//
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// thin-provisioning-tools is distributed in the hope that it will be
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// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with thin-provisioning-tools. If not, see
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// <http://www.gnu.org/licenses/>.
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#ifndef SPACE_MAP_DISK_STRUCTURES_H
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#define SPACE_MAP_DISK_STRUCTURES_H
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#include "base/endian_utils.h"
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// FIXME: what's this included for?
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#include "persistent-data/data-structures/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 no_op_ref_counter<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 MAX_METADATA_BLOCKS = (255 * ((1 << 14) - 64));
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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 no_op_ref_counter<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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uint64_t const BITMAP_CSUM_XOR = 240779;
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uint64_t const INDEX_CSUM_XOR = 160478;
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}
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}
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//----------------------------------------------------------------
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#endif
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