FltFsControlFile function (fltkernel.h)
The FltFsControlFile routine sends a control code directly to a specified file system or file system filter driver, causing the corresponding driver to perform the specified action.
NTSTATUS FLTAPI FltFsControlFile( [in] PFLT_INSTANCE Instance, [in] PFILE_OBJECT FileObject, [in] ULONG FsControlCode, [in, optional] PVOID InputBuffer, [in] ULONG InputBufferLength, [out, optional] PVOID OutputBuffer, [in] ULONG OutputBufferLength, [out, optional] PULONG LengthReturned );
Opaque instance pointer for the caller. This parameter is required and cannot be NULL.
File object pointer for the file or directory that is the target of this request. This parameter is required and cannot be NULL.
FSCTL_XXX code that indicates which file system operation is to be carried out. The value of this parameter determines the formats and required lengths of the InputBuffer and OutputBuffer, and it determines which of the following parameter pairs (InputBuffer and InputBufferLength, OutputBuffer and OutputBufferLength) is required.
[in, optional] InputBuffer
Pointer to a caller-allocated input buffer that contains device-specific information to be given to the target driver. If the FsControlCode parameter specifies an operation that does not require input data, this parameter is optional and can be NULL.
Size, in bytes, of the buffer at InputBuffer. This value is ignored if InputBuffer is NULL.
[out, optional] OutputBuffer
Pointer to a caller-allocated output buffer in which information is returned from the target driver. If the FsControlCode parameter specifies an operation that does not require output data, this parameter is optional and can be NULL.
Size, in bytes, of the buffer at OutputBuffer. This value is ignored if OutputBuffer is NULL.
[out, optional] LengthReturned
Pointer to a caller-allocated variable that receives the size, in bytes, of the information returned in the buffer at OutputBuffer. This parameter is optional and can be NULL.
FltFsControlFile returns STATUS_SUCCESS or an appropriate NTSTATUS value.
Minifilter drivers should call this routine instead of ZwFsControlFile.
The following FSCTL codes are currently documented for kernel-mode drivers:
For more information about the system-defined FSCTL_XXX codes, see the Remarks section of the reference entry for DeviceIoControl in the Microsoft Windows SDK documentation.
|Header||fltkernel.h (include Fltkernel.h)|