#ifndef _NTIOAPI_H
typedef struct _FILE_FS_FULL_SIZE_INFORMATION_EX
{
ULONGLONG ActualTotalAllocationUnits;
ULONGLONG ActualAvailableAllocationUnits;
ULONGLONG ActualPoolUnavailableAllocationUnits;
ULONGLONG CallerTotalAllocationUnits;
ULONGLONG CallerAvailableAllocationUnits;
ULONGLONG CallerPoolUnavailableAllocationUnits;
ULONGLONG UsedAllocationUnits;
ULONGLONG TotalReservedAllocationUnits;
ULONGLONG VolumeStorageReserveAllocationUnits;
ULONGLONG AvailableCommittedAllocationUnits;
ULONGLONG PoolAvailableAllocationUnits;
ULONG SectorsPerAllocationUnit;
ULONG BytesPerSector;
} FILE_FS_FULL_SIZE_INFORMATION_EX, *PFILE_FS_FULL_SIZE_INFORMATION_EX;
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This structure is documented in Windows Driver Kit.