#val_type uint64_t
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BTRFS_ROOT_TREE_OBJECTID 1ULL
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BTRFS_EXTENT_TREE_OBJECTID 2ULL
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BTRFS_CHUNK_TREE_OBJECTID 3ULL
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BTRFS_DEV_TREE_OBJECTID 4ULL
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BTRFS_FS_TREE_OBJECTID 5ULL
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BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
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BTRFS_CSUM_TREE_OBJECTID 7ULL
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BTRFS_QUOTA_TREE_OBJECTID 8ULL
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BTRFS_UUID_TREE_OBJECTID 9ULL
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BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL
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BTRFS_FIRST_FREE_OBJECTID 256ULL
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BTRFS_LAST_FREE_OBJECTID -256ULL
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UINT64_MAX -1ULL
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