USN_RECORD_COMMON_HEADER - NtDoc
Native API online documentation, based on the System Informer
(formerly Process Hacker) phnt
headers
// ntifs.h
typedef struct {
ULONG RecordLength;
USHORT MajorVersion;
USHORT MinorVersion;
} USN_RECORD_COMMON_HEADER, *PUSN_RECORD_COMMON_HEADER;
View the official Windows Driver Kit DDI reference// winioctl.h
typedef struct {
DWORD RecordLength;
WORD MajorVersion;
WORD MinorVersion;
} USN_RECORD_COMMON_HEADER, *PUSN_RECORD_COMMON_HEADER;
View the official Win32 API referenceNo description available.
The USN_RECORD_COMMON_HEADER structure 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.
RecordLengthThe 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 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.
MajorVersionThe 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 and the remainder of the structure should be parsed using that layout. |
MinorVersionThe 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.
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.
RecordLengthThe 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.
MajorVersionThe 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 and the remainder of the structure should be parsed using that layout. |
MinorVersionThe 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.