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FILE_RECORD_SEGMENT_HEADER structure

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[This structure is valid only for version 3 of NTFS volumes; it may be altered in future versions.]

Represents the file record segment. This is the header for each file record segment in the master file table (MFT).

Syntax

typedef struct _FILE_RECORD_SEGMENT_HEADER {
  MULTI_SECTOR_HEADER   MultiSectorHeader;
  ULONGLONG             Reserved1;
  USHORT                SequenceNumber;
  USHORT                Reserved2;
  USHORT                FirstAttributeOffset;
  USHORT                Flags;
  ULONG                 Reserved3[2];
  FILE_REFERENCE        BaseFileRecordSegment;
  USHORT                Reserved4;
  UPDATE_SEQUENCE_ARRAY UpdateSequenceArray;
} FILE_RECORD_SEGMENT_HEADER, *PFILE_RECORD_SEGMENT_HEADER;

Members

MultiSectorHeader

The multisector header defined by the cache manager. The MULTI_SECTOR_HEADER structure always contains the signature "FILE" and a description of the location and size of the update sequence array.

Reserved1

Reserved.

SequenceNumber

The sequence number. This value is incremented each time that a file record segment is freed; it is 0 if the segment is not used. The SequenceNumber field of a file reference must match the contents of this field; if they do not match, the file reference is incorrect and probably obsolete.

Reserved2

Reserved.

FirstAttributeOffset

The offset of the first attribute record, in bytes.

Flags

The file flags.

FILE_RECORD_SEGMENT_IN_USE (0x0001)

FILE_FILE_NAME_INDEX_PRESENT (0x0002)

Reserved3

Reserved.

BaseFileRecordSegment

A file reference to the base file record segment for this file. If this is the base file record, the value is 0. See MFT_SEGMENT_REFERENCE.

Reserved4

Reserved.

UpdateSequenceArray

The update sequence array to protect multisector transfers of the file record segment.

Remarks

Note that there is no associated header file for this structure.

This structure definition is valid only for major version 3 and minor version 0 or 1, as reported by FSCTL_GET_NTFS_VOLUME_DATA.

See also

Master File Table