FILE_FS_FULL_SIZE_INFORMATION_EX - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#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;

#endif

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This structure is documented in Windows Driver Kit.