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FILE_SFIO_RESERVE_INFORMATION structure (wdm.h)

  • Article

FILE_SFIO_RESERVE_INFORMATION is used to query or set a file's reserved bandwidth information for scheduled file I/O (SFIO).

Syntax

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;

Members

RequestsPerPeriod

Number of I/O requests that complete per period of time, as specified by the Period field. When setting bandwidth reservation, a value of 0 indicates to the file system that it must free any existing reserved bandwidth.

Period

The period for reservation, which is the time from which the I/O is issued to the kernel until the time the I/O should be completed, specified in milliseconds.

RetryFailures

Boolean value.

Discardable

Boolean value. When TRUE, the I/O should be completed with an error if a driver is unable to satisfy the I/O within the deadline.

RequestSize

Minimum size of any individual I/O request that can be issued by an application using bandwidth reservation.

NumOutstandingRequests

The number of RequestSize I/O requests allowed to be outstanding at any time. When setting reservations, this field MUST be ignored by servers and SHOULD be set to 0 by clients.

Requirements

Requirement Value
Header wdm.h

See also

NtQueryInformationFile