Source to bsd/hfs/hfscommon/headers/HFSVolumes.h
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*
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/*
File: HFSVolumes.h
Contains: On-disk data structures for HFS and HFS Plus volumes.
Version: Mac OS 8.1
Copyright: � 1984-1999 by Apple Computer, Inc. All rights reserved.
File Ownership:
DRI: Mark Day
Other Contacts: Deric Horn
Technology: File Systems
Writers:
(ngk) Nick Kledzik
(gap) george puckett
(djb) Don Brady
(msd) Mark Day
(DSH) Deric Horn
Change History (most recent first):
From HFSVolumes.i:
<MOSXS> 5/28/99 DJB Added on-disk B-tree structures.
<MOSXS> 4/9/98 djb Use a different kHFSPlusMountVersion for MacOS X.
<2> 2/12/98 ngk Clean up: add version field in this header, change Types.i to
MacTypes.i, remove pragma comments, remove unnecesarry typedef
struct Foo Foo statements.
<1> 2/9/98 msd first checked in
<0> 2/5/98 msd Imported from HFSVolumesPriv.i. Added "HFS" to many names.
Added reserved field to HFSPlusAttrInlineData.
From HFSVolumesPriv.i:
<CS19> 11/16/97 djb Bump volume format version for Unicode changes.
<CS18> 10/23/97 msd Bug 1685113. Change kHFSPlusMountVersion to '8.10' to trigger
MountCheck; it also happens to be a more correct value.
<CS17> 10/19/97 msd Bug 1684586. Rename modifyDate to attributeModDate. GetCatInfo
and SetCatInfo use only contentModDate.
<CS16> 9/19/97 msd Fix bug 1679778. In the LargeCatalogFile structure, change the
name of the linkCount field to "reserved1" since we no longer
support hard links.
<CS15> 9/10/97 msd Make sure fork and extent information is 8-byte aligned in
attribute records.
<CS14> 9/4/97 msd Attributes are now identified by a single Unicode string (flags
and OSTypes are gone), and may have extents (allowing them to be
very large). Removed C define of bitmapFile. Removed
kVolumeHardLinksBit. Added field lastMountedVersion to
VolumeHeader; moved unused space near start of structure to make
following fields nicely aligned. LargeExtentKey's keyLength is
now a UInt16, like all the rest of the HFS Plus B-Trees. Change
kHFSPlusVersion to $0003.
<CS13> 9/2/97 DSH Moved the VolumeHeader to sector 2 of HFS+ partition, bumped
kHFSPlusVersion to 0X0002.
<CS12> 8/5/97 msd Change kHFSPlusSigWord to $482B ('H+'). Add enum for
kHFSPlusVersion (set to $0001).
<CS11> 6/24/97 djb Add link count to HFS Plus file record. Add kVolumeHardLinksBit.
<CS10> 6/20/97 msd Remove the define for contentModDate.
<CS9> 6/12/97 djb Removed rootFileCount and rootFolderCount. Added new dates,
permissions, and encodingBitmap, changed signature to "D8".
<CS8> 6/6/97 djb Removed enum names and #pragma enumsalwaysint.
<CS7> 6/4/97 gap Removed ForBride conditional. Caused problem in
HFSVolumesPriv.a.
<CS6> 6/4/97 gap Add #pragma enumsalwaysint so file will work with latest
Interfacer tool in Bride build.
<CS5> 5/30/97 djb Add constants for minimum key lengths.
<CS4> 5/28/97 msd Add AttributeKey and associated enums.
<CS3> 5/20/97 DSH Keep sigWord in sync with last build, D5.
<CS2> 5/15/97 msd Key length and fork type for extent records should be unsigned.
<CS1> 4/28/97 djb first checked in
<HFS7> 4/7/97 msd Add FileID for attributes BTree.
<HFS6> 4/4/97 djb Major update to HFS Plus structures.
<HFS5> 3/17/97 DSH Adding kNumHFSPlusExtents, and kNumHFSExtents.
<HFS4> 2/19/97 djb Latest HFS Plus format changes. Removed B-Tree Manager data
structures since they're defined in BTreesPrivate.h.
<HFS3> 2/13/97 msd Add unions for extent key and data.
<HFS2> 1/16/97 djb Changed kLargeExtentKeyMaximumLength to 11.
<HFS1> 1/9/97 djb first checked in
<0> 1/7/97 djb Converted from HFSVolumePriv.h file.
*/
#ifndef __HFSVOLUMES__
#define __HFSVOLUMES__
#ifndef __MACOSTYPES__
#include "system/MacOSTypes.h"
#endif
#ifndef __MACOSSTUBS__
#include "system/MacOSStubs.h"
#endif
#if PRAGMA_ONCE
#pragma once
#endif
#ifdef __cplusplus
extern "C" {
#endif
#if PRAGMA_IMPORT
#pragma import on
#endif
#if PRAGMA_STRUCT_ALIGN
#pragma options align=mac68k
#elif PRAGMA_STRUCT_PACKPUSH
#pragma pack(push, 2)
#elif PRAGMA_STRUCT_PACK
#pragma pack(2)
#endif
/* Signatures used to differentiate between HFS and HFS Plus volumes */
enum {
kHFSSigWord = 0x4244, /* 'BD' in ASCII */
kHFSPlusSigWord = 0x482B, /* 'H+' in ASCII */
kHFSPlusVersion = 0x0004, /* will change as format changes (version 4 shipped with Mac OS 8.1) */
#if TARGET_API_MACOS_X
kHFSPlusMountVersion = FOUR_CHAR_CODE('8.10') /* will change as implementations change ('8.10' in Mac OS 8.1) */
#else
kHFSPlusMountVersion = FOUR_CHAR_CODE('9.00') /* will change as implementations change */
#endif
};
/* CatalogNodeID is used to track catalog objects */
typedef UInt32 HFSCatalogNodeID;
/* Unicode strings are used for file and folder names (HFS Plus only) */
struct HFSUniStr255 {
UInt16 length; /* number of unicode characters */
UniChar unicode[255]; /* unicode characters */
};
typedef struct HFSUniStr255 HFSUniStr255;
typedef const HFSUniStr255 * ConstHFSUniStr255Param;
enum {
kHFSMaxVolumeNameChars = 27,
kHFSMaxFileNameChars = 31,
kHFSPlusMaxFileNameChars = 255
};
/* Extent overflow file data structures */
/* HFS Extent key */
struct HFSExtentKey {
UInt8 keyLength; /* length of key, excluding this field */
UInt8 forkType; /* 0 = data fork, FF = resource fork */
HFSCatalogNodeID fileID; /* file ID */
UInt16 startBlock; /* first file allocation block number in this extent */
};
typedef struct HFSExtentKey HFSExtentKey;
/* HFS Plus Extent key */
struct HFSPlusExtentKey {
UInt16 keyLength; /* length of key, excluding this field */
UInt8 forkType; /* 0 = data fork, FF = resource fork */
UInt8 pad; /* make the other fields align on 32-bit boundary */
HFSCatalogNodeID fileID; /* file ID */
UInt32 startBlock; /* first file allocation block number in this extent */
};
typedef struct HFSPlusExtentKey HFSPlusExtentKey;
/* Number of extent descriptors per extent record */
enum {
kHFSExtentDensity = 3,
kHFSPlusExtentDensity = 8
};
/* HFS extent descriptor */
struct HFSExtentDescriptor {
UInt16 startBlock; /* first allocation block */
UInt16 blockCount; /* number of allocation blocks */
};
typedef struct HFSExtentDescriptor HFSExtentDescriptor;
/* HFS Plus extent descriptor */
struct HFSPlusExtentDescriptor {
UInt32 startBlock; /* first allocation block */
UInt32 blockCount; /* number of allocation blocks */
};
typedef struct HFSPlusExtentDescriptor HFSPlusExtentDescriptor;
/* HFS extent record */
typedef HFSExtentDescriptor HFSExtentRecord[3];
/* HFS Plus extent record */
typedef HFSPlusExtentDescriptor HFSPlusExtentRecord[8];
/* Fork data info (HFS Plus only) - 80 bytes */
struct HFSPlusForkData {
UInt64 logicalSize; /* fork's logical size in bytes */
UInt32 clumpSize; /* fork's clump size in bytes */
UInt32 totalBlocks; /* total blocks used by this fork */
HFSPlusExtentRecord extents; /* initial set of extents */
};
typedef struct HFSPlusForkData HFSPlusForkData;
/* Permissions info (HFS Plus only) - 16 bytes */
struct HFSPlusPermissions {
UInt32 ownerID; /* user or group ID of file/folder owner */
UInt32 groupID; /* additional user of group ID */
UInt32 permissions; /* permissions (bytes: unused, owner, group, everyone) */
UInt32 specialDevice; /* UNIX: device for character or block special file */
};
typedef struct HFSPlusPermissions HFSPlusPermissions;
/* Catalog file data structures */
enum {
kHFSRootParentID = 1, /* Parent ID of the root folder */
kHFSRootFolderID = 2, /* Folder ID of the root folder */
kHFSExtentsFileID = 3, /* File ID of the extents file */
kHFSCatalogFileID = 4, /* File ID of the catalog file */
kHFSBadBlockFileID = 5, /* File ID of the bad allocation block file */
kHFSAllocationFileID = 6, /* File ID of the allocation file (HFS Plus only) */
kHFSStartupFileID = 7, /* File ID of the startup file (HFS Plus only) */
kHFSAttributesFileID = 8, /* File ID of the attribute file (HFS Plus only) */
kHFSBogusExtentFileID = 15, /* Used for exchanging extents in extents file */
kHFSFirstUserCatalogNodeID = 16
};
/* HFS catalog key */
struct HFSCatalogKey {
UInt8 keyLength; /* key length (in bytes) */
UInt8 reserved; /* reserved (set to zero) */
HFSCatalogNodeID parentID; /* parent folder ID */
Str31 nodeName; /* catalog node name */
};
typedef struct HFSCatalogKey HFSCatalogKey;
/* HFS Plus catalog key */
struct HFSPlusCatalogKey {
UInt16 keyLength; /* key length (in bytes) */
HFSCatalogNodeID parentID; /* parent folder ID */
HFSUniStr255 nodeName; /* catalog node name */
};
typedef struct HFSPlusCatalogKey HFSPlusCatalogKey;
/* Catalog record types */
enum {
/* HFS Catalog Records */
kHFSFolderRecord = 0x0100, /* Folder record */
kHFSFileRecord = 0x0200, /* File record */
kHFSFolderThreadRecord = 0x0300, /* Folder thread record */
kHFSFileThreadRecord = 0x0400, /* File thread record */
/* HFS Plus Catalog Records */
kHFSPlusFolderRecord = 1, /* Folder record */
kHFSPlusFileRecord = 2, /* File record */
kHFSPlusFolderThreadRecord = 3, /* Folder thread record */
kHFSPlusFileThreadRecord = 4 /* File thread record */
};
/* Catalog file record flags */
enum {
kHFSFileLockedBit = 0x0000, /* file is locked and cannot be written to */
kHFSFileLockedMask = 0x0001,
kHFSThreadExistsBit = 0x0001, /* a file thread record exists for this file */
kHFSThreadExistsMask = 0x0002
};
/* HFS catalog folder record - 70 bytes */
struct HFSCatalogFolder {
SInt16 recordType; /* record type */
UInt16 flags; /* folder flags */
UInt16 valence; /* folder valence */
HFSCatalogNodeID folderID; /* folder ID */
UInt32 createDate; /* date and time of creation */
UInt32 modifyDate; /* date and time of last modification */
UInt32 backupDate; /* date and time of last backup */
DInfo userInfo; /* Finder information */
DXInfo finderInfo; /* additional Finder information */
UInt32 reserved[4]; /* reserved - set to zero */
};
typedef struct HFSCatalogFolder HFSCatalogFolder;
/* HFS Plus catalog folder record - 88 bytes */
struct HFSPlusCatalogFolder {
SInt16 recordType; /* record type = HFS Plus folder record */
UInt16 flags; /* file flags */
UInt32 valence; /* folder's valence (limited to 2^16 in Mac OS) */
HFSCatalogNodeID folderID; /* folder ID */
UInt32 createDate; /* date and time of creation */
UInt32 contentModDate; /* date and time of last content modification */
UInt32 attributeModDate; /* date and time of last attribute modification */
UInt32 accessDate; /* date and time of last access (MacOS X only) */
UInt32 backupDate; /* date and time of last backup */
HFSPlusPermissions permissions; /* permissions (for MacOS X) */
DInfo userInfo; /* Finder information */
DXInfo finderInfo; /* additional Finder information */
UInt32 textEncoding; /* hint for name conversions */
UInt32 reserved; /* reserved - set to zero */
};
typedef struct HFSPlusCatalogFolder HFSPlusCatalogFolder;
/* HFS catalog file record - 102 bytes */
struct HFSCatalogFile {
SInt16 recordType; /* record type */
UInt8 flags; /* file flags */
SInt8 fileType; /* file type (unused ?) */
FInfo userInfo; /* Finder information */
HFSCatalogNodeID fileID; /* file ID */
UInt16 dataStartBlock; /* not used - set to zero */
SInt32 dataLogicalSize; /* logical EOF of data fork */
SInt32 dataPhysicalSize; /* physical EOF of data fork */
UInt16 rsrcStartBlock; /* not used - set to zero */
SInt32 rsrcLogicalSize; /* logical EOF of resource fork */
SInt32 rsrcPhysicalSize; /* physical EOF of resource fork */
UInt32 createDate; /* date and time of creation */
UInt32 modifyDate; /* date and time of last modification */
UInt32 backupDate; /* date and time of last backup */
FXInfo finderInfo; /* additional Finder information */
UInt16 clumpSize; /* file clump size (not used) */
HFSExtentRecord dataExtents; /* first data fork extent record */
HFSExtentRecord rsrcExtents; /* first resource fork extent record */
UInt32 reserved; /* reserved - set to zero */
};
typedef struct HFSCatalogFile HFSCatalogFile;
/* HFS Plus catalog file record - 248 bytes */
struct HFSPlusCatalogFile {
SInt16 recordType; /* record type = HFS Plus file record */
UInt16 flags; /* file flags */
UInt32 linkCount; /* reserved - set to zero */
HFSCatalogNodeID fileID; /* file ID */
UInt32 createDate; /* date and time of creation */
UInt32 contentModDate; /* date and time of last content modification */
UInt32 attributeModDate; /* date and time of last attribute modification */
UInt32 accessDate; /* date and time of last access (MacOS X only) */
UInt32 backupDate; /* date and time of last backup */
HFSPlusPermissions permissions; /* permissions (for MacOS X) */
FInfo userInfo; /* Finder information */
FXInfo finderInfo; /* additional Finder information */
UInt32 textEncoding; /* hint for name conversions */
UInt32 reserved2; /* reserved - set to zero */
/* start on double long (64 bit) boundry */
HFSPlusForkData dataFork; /* size and block data for data fork */
HFSPlusForkData resourceFork; /* size and block data for resource fork */
};
typedef struct HFSPlusCatalogFile HFSPlusCatalogFile;
/* HFS catalog thread record - 46 bytes */
struct HFSCatalogThread {
SInt16 recordType; /* record type */
SInt32 reserved[2]; /* reserved - set to zero */
HFSCatalogNodeID parentID; /* parent ID for this catalog node */
Str31 nodeName; /* name of this catalog node */
};
typedef struct HFSCatalogThread HFSCatalogThread;
/* HFS Plus catalog thread record -- 264 bytes */
struct HFSPlusCatalogThread {
SInt16 recordType; /* record type */
SInt16 reserved; /* reserved - set to zero */
HFSCatalogNodeID parentID; /* parent ID for this catalog node */
HFSUniStr255 nodeName; /* name of this catalog node (variable length) */
};
typedef struct HFSPlusCatalogThread HFSPlusCatalogThread;
/*
These are the types of records in the attribute B-tree. The values were chosen
so that they wouldn't conflict with the catalog record types.
*/
enum {
kHFSPlusAttrInlineData = 0x10, /* if size < kAttrOverflowSize */
kHFSPlusAttrForkData = 0x20, /* if size >= kAttrOverflowSize */
kHFSPlusAttrExtents = 0x30 /* overflow extents for large attributes */
};
/*
HFSPlusAttrInlineData
For small attributes, whose entire value is stored within this one
B-tree record.
There would not be any other records for this attribute.
*/
struct HFSPlusAttrInlineData {
UInt32 recordType; /* = kHFSPlusAttrInlineData*/
UInt32 reserved;
UInt32 logicalSize; /* size in bytes of userData*/
UInt8 userData[2]; /* variable length; space allocated is a multiple of 2 bytes*/
};
typedef struct HFSPlusAttrInlineData HFSPlusAttrInlineData;
/*
HFSPlusAttrForkData
For larger attributes, whose value is stored in allocation blocks.
If the attribute has more than 8 extents, there will be additonal
records (of type HFSPlusAttrExtents) for this attribute.
*/
struct HFSPlusAttrForkData {
UInt32 recordType; /* = kHFSPlusAttrForkData*/
UInt32 reserved;
HFSPlusForkData theFork; /* size and first extents of value*/
};
typedef struct HFSPlusAttrForkData HFSPlusAttrForkData;
/*
HFSPlusAttrExtents
This record contains information about overflow extents for large,
fragmented attributes.
*/
struct HFSPlusAttrExtents {
UInt32 recordType; /* = kHFSPlusAttrExtents*/
UInt32 reserved;
HFSPlusExtentRecord extents; /* additional extents*/
};
typedef struct HFSPlusAttrExtents HFSPlusAttrExtents;
/* A generic Attribute Record*/
union HFSPlusAttrRecord {
UInt32 recordType;
HFSPlusAttrInlineData inlineData;
HFSPlusAttrForkData forkData;
HFSPlusAttrExtents overflowExtents;
};
typedef union HFSPlusAttrRecord HFSPlusAttrRecord;
/* Key and node lengths */
enum {
kHFSPlusExtentKeyMaximumLength = sizeof(HFSPlusExtentKey) - sizeof(UInt16),
kHFSExtentKeyMaximumLength = sizeof(HFSExtentKey) - sizeof(UInt8),
kHFSPlusCatalogKeyMaximumLength = sizeof(HFSPlusCatalogKey) - sizeof(UInt16),
kHFSPlusCatalogKeyMinimumLength = kHFSPlusCatalogKeyMaximumLength - sizeof(HFSUniStr255) + sizeof(UInt16),
kHFSCatalogKeyMaximumLength = sizeof(HFSCatalogKey) - sizeof(UInt8),
kHFSCatalogKeyMinimumLength = kHFSCatalogKeyMaximumLength - sizeof(Str31) + sizeof(UInt8),
kHFSPlusCatalogMinNodeSize = 4096,
kHFSPlusExtentMinNodeSize = 512,
kHFSPlusAttrMinNodeSize = 4096
};
/* HFS and HFS Plus volume attribute bits */
enum {
/* Bits 0-6 are reserved (always cleared by MountVol call) */
kHFSVolumeHardwareLockBit = 7, /* volume is locked by hardware */
kHFSVolumeUnmountedBit = 8, /* volume was successfully unmounted */
kHFSVolumeSparedBlocksBit = 9, /* volume has bad blocks spared */
kHFSVolumeNoCacheRequiredBit = 10, /* don't cache volume blocks (i.e. RAM or ROM disk) */
kHFSBootVolumeInconsistentBit = 11, /* boot volume is inconsistent (System 7.6 and later) */
/* Bits 12-14 are reserved for future use */
kHFSVolumeSoftwareLockBit = 15, /* volume is locked by software */
kHFSVolumeHardwareLockMask = 1 << kHFSVolumeHardwareLockBit,
kHFSVolumeUnmountedMask = 1 << kHFSVolumeUnmountedBit,
kHFSVolumeSparedBlocksMask = 1 << kHFSVolumeSparedBlocksBit,
kHFSVolumeNoCacheRequiredMask = 1 << kHFSVolumeNoCacheRequiredBit,
kHFSBootVolumeInconsistentMask = 1 << kHFSBootVolumeInconsistentBit,
kHFSVolumeSoftwareLockMask = 1 << kHFSVolumeSoftwareLockBit,
kHFSMDBAttributesMask = 0x8380
};
/* Master Directory Block (HFS only) - 162 bytes */
/* Stored at sector #2 (3rd sector) */
struct HFSMasterDirectoryBlock {
/* These first fields are also used by MFS */
UInt16 drSigWord; /* volume signature */
UInt32 drCrDate; /* date and time of volume creation */
UInt32 drLsMod; /* date and time of last modification */
UInt16 drAtrb; /* volume attributes */
UInt16 drNmFls; /* number of files in root folder */
UInt16 drVBMSt; /* first block of volume bitmap */
UInt16 drAllocPtr; /* start of next allocation search */
UInt16 drNmAlBlks; /* number of allocation blocks in volume */
UInt32 drAlBlkSiz; /* size (in bytes) of allocation blocks */
UInt32 drClpSiz; /* default clump size */
UInt16 drAlBlSt; /* first allocation block in volume */
UInt32 drNxtCNID; /* next unused catalog node ID */
UInt16 drFreeBks; /* number of unused allocation blocks */
Str27 drVN; /* volume name */
/* Master Directory Block extensions for HFS */
UInt32 drVolBkUp; /* date and time of last backup */
UInt16 drVSeqNum; /* volume backup sequence number */
UInt32 drWrCnt; /* volume write count */
UInt32 drXTClpSiz; /* clump size for extents overflow file */
UInt32 drCTClpSiz; /* clump size for catalog file */
UInt16 drNmRtDirs; /* number of directories in root folder */
UInt32 drFilCnt; /* number of files in volume */
UInt32 drDirCnt; /* number of directories in volume */
UInt32 drFndrInfo[8]; /* information used by the Finder */
UInt16 drEmbedSigWord; /* embedded volume signature (formerly drVCSize) */
HFSExtentDescriptor drEmbedExtent; /* embedded volume location and size (formerly drVBMCSize and drCtlCSize) */
UInt32 drXTFlSize; /* size of extents overflow file */
HFSExtentRecord drXTExtRec; /* extent record for extents overflow file */
UInt32 drCTFlSize; /* size of catalog file */
HFSExtentRecord drCTExtRec; /* extent record for catalog file */
};
typedef struct HFSMasterDirectoryBlock HFSMasterDirectoryBlock;
/* HFSPlusVolumeHeader (HFS Plus only) - 512 bytes */
/* Stored at sector #2 (3rd sector) and second-to-last sector. */
struct HFSPlusVolumeHeader {
UInt16 signature; /* volume signature == 'H+' */
UInt16 version; /* current version is kHFSPlusVersion */
UInt32 attributes; /* volume attributes */
UInt32 lastMountedVersion; /* implementation version which last mounted volume */
UInt32 reserved; /* reserved - set to zero */
UInt32 createDate; /* date and time of volume creation */
UInt32 modifyDate; /* date and time of last modification */
UInt32 backupDate; /* date and time of last backup */
UInt32 checkedDate; /* date and time of last disk check */
UInt32 fileCount; /* number of files in volume */
UInt32 folderCount; /* number of directories in volume */
UInt32 blockSize; /* size (in bytes) of allocation blocks */
UInt32 totalBlocks; /* number of allocation blocks in volume (includes this header and VBM*/
UInt32 freeBlocks; /* number of unused allocation blocks */
UInt32 nextAllocation; /* start of next allocation search */
UInt32 rsrcClumpSize; /* default resource fork clump size */
UInt32 dataClumpSize; /* default data fork clump size */
HFSCatalogNodeID nextCatalogID; /* next unused catalog node ID */
UInt32 writeCount; /* volume write count */
UInt64 encodingsBitmap; /* which encodings have been use on this volume */
UInt8 finderInfo[32]; /* information used by the Finder */
HFSPlusForkData allocationFile; /* allocation bitmap file */
HFSPlusForkData extentsFile; /* extents B-tree file */
HFSPlusForkData catalogFile; /* catalog B-tree file */
HFSPlusForkData attributesFile; /* extended attributes B-tree file */
HFSPlusForkData startupFile; /* boot file */
};
typedef struct HFSPlusVolumeHeader HFSPlusVolumeHeader;
/* ---------- HFS and HFS Plus B-tree structures ---------- */
/* BTNodeDescriptor -- Every B-tree node starts with these fields. */
struct BTNodeDescriptor {
UInt32 fLink; /* next node at this level*/
UInt32 bLink; /* previous node at this level*/
SInt8 kind; /* kind of node (leaf, index, header, map)*/
UInt8 height; /* zero for header, map; child is one more than parent*/
UInt16 numRecords; /* number of records in this node*/
UInt16 reserved; /* reserved; set to zero*/
};
typedef struct BTNodeDescriptor BTNodeDescriptor;
/* Constants for BTNodeDescriptor kind */
enum {
kBTLeafNode = -1,
kBTIndexNode = 0,
kBTHeaderNode = 1,
kBTMapNode = 2
};
/* BTHeaderRec -- The first record of a B-tree header node */