DUPLICATE_EXTENTS_DATA structure (winioctl.h)

Contains parameters for the FSCTL_DUPLICATE_EXTENTS control code that performs the Block Cloning operation.

Syntax

typedef struct _DUPLICATE_EXTENTS_DATA {
  HANDLE        FileHandle;
  LARGE_INTEGER SourceFileOffset;
  LARGE_INTEGER TargetFileOffset;
  LARGE_INTEGER ByteCount;
} DUPLICATE_EXTENTS_DATA, *PDUPLICATE_EXTENTS_DATA;

Members

FileHandle

A handle to the source file from which the byte range is to be copied. To retrieve a file handle, use the CreateFile function.

SourceFileOffset

The offset, in bytes, to the beginning of the range to copy from the source file.

TargetFileOffset

The offset, in bytes, to place the copied byte range in the destination file.

ByteCount

The length, in bytes, of the range to copy.

Requirements

See also

Block Cloning

DeviceIoControl

FSCTL_DUPLICATE_EXTENTS_TO_FILE

File Management Control Codes