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Windows Driver Kit DDI reference (ni-ntifs-fsctl_shuffle_file)

Description

FSCTL_SHUFFLE_FILE adds or removes allocation from within the specified file.

Parameters

Major code

Input buffer

Pointer to a SHUFFLE_FILE_DATA structure that describes the allocation to be shuffled.

Input buffer length

Size in bytes of the input buffer.

Output buffer

None; set to NULL.

Output buffer length

Set to zero.

Input/output buffer

Input/output buffer length

Status block

Return values

FSCTL_SHUFFLE_FILE returns STATUS_SUCCESS upon successful completion; otherwise it returns an NTSTATUS code such as one of the following.

Return code	Meaning
STATUS_ACCESS_DENIED	For various reasons, including only kernel-mode calls are allowed, or the volume is locked.
STATUS_BUFFER_TOO_SMALL	The specified input buffer length is smaller than sizeof(SHUFFLE_FILE_DATA).
STATUS_MEDIA_WRITE_PROTECTED	Shuffling is not allowed on a read-only volume.

Remarks

This control code will cause data to shift within the file. The caller is responsible for protecting/erasing the random data within the added allocation.

To perform this operation, call FltFsControlFile or ZwFsControlFile with the following parameters.

Parameter	Description
Instance	[in] For FltFsControlFile only. An opaque instance pointer for the caller. This parameter is required and cannot be NULL.
FileObject	[in] For FltFsControlFile only. A file object pointer for the file or directory that is the target of this request. This parameter is required and cannot be NULL.
FileHandle	[in] For ZwFsControlFile only. File handle of the file or directory that is the target of this request. This parameter is required and cannot be NULL.
IoStatusBlock	[out] For ZwFsControlFile only. Pointer to an IO_STATUS_BLOCK structure that contains the final status of the request.
FsControlCode	[in] Set to FSCTL_SHUFFLE_FILE.
InputBuffer	[in] See IOCTL parameters.
InputBufferLength	[in] See IOCTL parameters.

FSCTL_SHUFFLE_FILE - NtDoc