// ntifs.h

typedef struct _SHUFFLE_FILE_DATA {
  LONGLONG StartingOffset;
  LONGLONG Length;
  ULONG    Flags;
} SHUFFLE_FILE_DATA, *PSHUFFLE_FILE_DATA;
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Windows Driver Kit DDI reference (ns-ntifs-shuffle_file_data)

Description

SHUFFLE_FILE_DATA is the input structure for the FSCTL_SHUFFLE_FILE control code.

Members

`StartingOffset`

Cluster-aligned byte offset of the base of the contiguous region from which to add or remove data in the file passed with the FS control code.

`Length`

Cluster-aligned length in bytes of the data to be added or removed. Length can be one of the following values.

Value	Meaning
Greater than 0	Add the allocation to the file.
Less than 0	Remove the allocation from the file.
0	Do nothing.

`Flags`

Bitwise OR of flags for the shuffle operation. Flags be the following value.

Value	Meaning
SHUFFLE_FILE_FLAG_SKIP_INITIALIZING_NEW_CLUSTERS (0x001)	Valid only when adding allocation. When set, free clusters are allocated and added but have arbitrary initial contents (they are not zero-initialized).

SHUFFLE_FILE_DATA - NtDoc