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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.
C++ |
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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 |
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 |
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) |
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