FILE_GET_QUOTA_INFORMATION - NtDoc

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

// NtQueryQuotaInformationFile/NtSetQuotaInformationFile types

typedef struct _FILE_GET_QUOTA_INFORMATION
{
    ULONG NextEntryOffset;
    ULONG SidLength;
    _Field_size_bytes_(SidLength) SID Sid;
} FILE_GET_QUOTA_INFORMATION, *PFILE_GET_QUOTA_INFORMATION;

#endif

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This structure is documented in Windows Driver Kit.