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FltOplockIsFastIoPossible routine

The FltOplockIsFastIoPossible routine checks a file's opportunistic lock (oplock) state to determine whether fast I/O can be performed on the file.

Syntax


BOOLEAN FltOplockIsFastIoPossible(
  _In_  POPLOCK Oplock
);

Parameters

Oplock [in]

Opaque oplock pointer for the file. This pointer must have been initialized by a previous call to FltInitializeOplock.

Return value

FltOplockIsFastIoPossible returns FALSE if there are outstanding oplocks on the file that prevent fast I/O from being performed; TRUE otherwise.

Remarks

FltOplockIsFastIoPossible determines whether fast I/O can be performed on a file, according to the following conditions:

  • If the Oplock parameter is NULL, or if the value of *Oplock is NULL, there are no outstanding oplocks on the file, and fast I/O can be performed on the file.

  • If an exclusive oplock was granted for the file, but no oplock break is in progress, fast I/O can be performed on the file.

For detailed information about opportunistic locks, see the Windows SDK documentation.

Requirements

Header

Fltkernel.h (include Fltkernel.h)

Library

FltMgr.lib

IRQL

<= APC_LEVEL

See also

FltCheckOplock
FltCurrentBatchOplock
FltInitializeOplock
FltOplockFsctrl
FltUninitializeOplock
FSCTL_OPBATCH_ACK_CLOSE_PENDING
FSCTL_OPLOCK_BREAK_ACK_NO_2
FSCTL_OPLOCK_BREAK_ACKNOWLEDGE
FSCTL_OPLOCK_BREAK_NOTIFY
FSCTL_REQUEST_BATCH_OPLOCK
FSCTL_REQUEST_FILTER_OPLOCK
FSCTL_REQUEST_OPLOCK_LEVEL_1
FSCTL_REQUEST_OPLOCK_LEVEL_2
FsRtlOplockIsFastIoPossible

 

 

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