USN_RECORD_COMMON_HEADER structure (winioctl.h)
Contains the information for an update sequence number (USN) common header which is common through USN_RECORD_V2, USN_RECORD_V3 and USN_RECORD_V4 structure.
Syntax
typedef struct {
DWORD RecordLength;
WORD MajorVersion;
WORD MinorVersion;
} USN_RECORD_COMMON_HEADER, *PUSN_RECORD_COMMON_HEADER;
Members
RecordLength
The total length of a record, in bytes.
Because USN record is a variable size, the RecordLength member should be used when calculating the address of the next record in an output buffer, for example, a buffer that is returned from operations for the DeviceIoControl function that work with different USN record types.
For USN_RECORD_V4 structure, the size in bytes of any change journal record is at most the size of the structure, plus (NumberOfExtents-1) times size of the USN_RECORD_EXTENT.
MajorVersion
The major version number of the change journal software for this record.
For example, if the change journal software is version 4.0, the major version number is 4.
| Value | Description |
|---|---|
| 2 | The structure is a USN_RECORD_V2 structure and the remainder of the structure should be parsed using that layout. |
| 3 | The structure is a USN_RECORD_V3 structure and the remainder of the structure should be parsed using that layout. |
| 4 | The structure is a [USN_RECORD_V4 structure](ns-winioctl-usn_record_v4.md) and the remainder of the structure should be parsed using that layout. |
MinorVersion
The minor version number of the change journal software for this record. For example, if the change journal software is version 4.0, the minor version number is zero.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 8.1 [desktop apps only] |
| Minimum supported server | Windows Server 2012 R2 [desktop apps only] |
| Header | winioctl.h (include Windows.h) |