65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
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// 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 PERSISTENT_DATA_BTREE_DISK_STRUCTURES_H
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#define PERSISTENT_DATA_BTREE_DISK_STRUCTURES_H
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#include "base/endian_utils.h"
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//----------------------------------------------------------------
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namespace persistent_data {
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namespace btree_detail {
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using namespace base;
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uint32_t const BTREE_CSUM_XOR = 121107;
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//------------------------------------------------
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// On disk data layout for btree nodes
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enum node_flags {
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INTERNAL_NODE = 1,
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LEAF_NODE = 1 << 1
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};
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struct node_header {
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le32 csum;
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le32 flags;
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le64 blocknr; /* which block this node is supposed to live in */
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le32 nr_entries;
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le32 max_entries;
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le32 value_size;
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le32 padding;
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} __attribute__((packed));
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struct disk_node {
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struct node_header header;
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le64 keys[0];
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} __attribute__((packed));
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enum node_type {
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INTERNAL,
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LEAF
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};
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}
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}
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//----------------------------------------------------------------
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#endif
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