FSCTL_READ_FILE_USN_DATA IOCTL (winioctl.h)

Retrieves the update sequence number (USN) change-journal information for the specified file or directory.

To perform this operation, call the DeviceIoControl function with the following parameters.

BOOL 
WINAPI 
DeviceIoControl( (HANDLE)       hDevice,         // handle to device
                 (DWORD) FSCTL_READ_FILE_USN_DATA, // dwIoControlCode
                 (LPVOID)       lpInBuffer,      // input buffer
                 (DWORD)        nInBufferSize,   // size of input buffer
                 (LPVOID)       lpOutBuffer,     // output buffer
                 (DWORD)        nOutBufferSize,  // size of output buffer
                 (LPDWORD)      lpBytesReturned, // number of bytes returned
                 (LPOVERLAPPED) lpOverlapped );  // OVERLAPPED structure

Remarks

If the call succeeds, the members of the returned USN_RECORD_V2 or USN_RECORD_V3 structure are valid except for the following members: TimeStamp, Reason, and SourceInfo. The Usn member represents the last USN written to the journal for this file or directory.

For more information, see Creating, Modifying, and Deleting a Change Journal.

To retrieve a handle to a volume, call CreateFile with the lpFileName parameter set to a string in the following form:

\\.\X:

In the preceding string, X is the letter identifying the drive on which the volume appears. The volume must be ReFS or NTFS 3.0 or later. To obtain the NTFS version of a volume, open a command prompt with Administrator access rights and execute the following command:

FSUtil.exe FSInfo NTFSInfo X:

where X is the drive letter of the volume.

In Windows 8 and Windows Server 2012, this code is supported by the following technologies.

Requirements

See also

CreateFile

DeviceIoControl

USN_RECORD

Volume Management Control Codes