#ifndef _NTIOAPI_H
/**
* The FILE_ALLOCATION_INFORMATION structure is used to set the allocation size for a file.
* \sa https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/ntifs/ns-ntifs-_file_allocation_information
*/
typedef struct _FILE_ALLOCATION_INFORMATION
{
LARGE_INTEGER AllocationSize;
} FILE_ALLOCATION_INFORMATION, *PFILE_ALLOCATION_INFORMATION;
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This structure is documented in Windows Driver Kit.