// ntifs.h

typedef struct _FILE_ZERO_DATA_INFORMATION_EX {
  LARGE_INTEGER FileOffset;
  LARGE_INTEGER BeyondFinalZero;
  ULONG         Flags;
} FILE_ZERO_DATA_INFORMATION_EX, *PFILE_ZERO_DATA_INFORMATION_EX;
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Windows Driver Kit DDI reference (ns-ntifs-_file_zero_data_information_ex)

_FILE_ZERO_DATA_INFORMATION_EX structure

Description

Contains a range of a file to set to zeros. This structure is used by the FSCTL_SET_ZERO_DATA control code. It's similar to FILE_ZERO_DATA_INFORMATION, but contains an additional Flags member.

Members

`FileOffset`

The file offset of the start of the range to set to zeros, in bytes.

`BeyondFinalZero`

The byte offset of the first byte beyond the last zeroed byte.

`Flags`

The following flags are supported:

Flag	Description
FILE_ZERO_DATA_INFORMATION_FLAG_PRESERVE_CACHED_DATA	Indicates not to purge the contents of the cache corresponding to this range of the file. Only drivers can set this flag.

FILE_ZERO_DATA_INFORMATION_EX - NtDoc