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.
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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
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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.
| Technology | Supported |
|---|---|
| Server Message Block (SMB) 3.0 protocol | No |
| SMB 3.0 Transparent Failover (TFO) | No |
| SMB 3.0 with Scale-out File Shares (SO) | No |
| Cluster Shared Volume File System (CsvFS) | Yes |
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows XP [desktop apps only] |
| Minimum supported server | Windows Server 2003 [desktop apps only] |
| Header | winioctl.h (include Windows.h) |