FILE_SFIO_RESERVE_INFORMATION - NtDoc

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

typedef struct _FILE_SFIO_RESERVE_INFORMATION
{
    ULONG RequestsPerPeriod;
    ULONG Period;
    BOOLEAN RetryFailures;
    BOOLEAN Discardable;
    ULONG RequestSize;
    ULONG NumOutstandingRequests;
} FILE_SFIO_RESERVE_INFORMATION, *PFILE_SFIO_RESERVE_INFORMATION;

#endif

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This structure is documented in Windows Driver Kit.