// ntifs.h

typedef struct {
  LARGE_INTEGER StartingLcn;
  ULONG         Flags;
} STARTING_LCN_INPUT_BUFFER_EX, *PSTARTING_LCN_INPUT_BUFFER_EX;
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Windows Driver Kit DDI reference (ns-ntifs-starting_lcn_input_buffer_ex)

Description

The STARTING_LCN_INPUT_BUFFER_EX structure contains the starting logical cluster number (LCN) for the FSCTL_GET_VOLUME_BITMAP control code.

Members

`StartingLcn`

The LCN from which the operation should start when describing a bitmap. This member will be rounded down to a file-system-dependent rounding boundary, and that value will be returned. Its value should be an integral multiple of eight.

`Flags`

Set of flags that modify the behavior of the bitmap retrieval operation. The following flag is defined.

Flag	Description
GET_VOLUME_BITMAP_FLAG_MASK_METADATA (0x00000001)	When set, indicates that the operation should include metadata in the volume bitmap.