FltOplockIsFastIoPossible function (fltkernel.h)

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 FLTAPI FltOplockIsFastIoPossible(
  [in] POPLOCK Oplock
);

Parameters

[in] Oplock

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.

Requirements

See also

FSCTL_OPBATCH_ACK_CLOSE_PENDING

FSCTL_OPLOCK_BREAK_ACKNOWLEDGE

FSCTL_OPLOCK_BREAK_ACK_NO_2

FSCTL_OPLOCK_BREAK_NOTIFY

FSCTL_REQUEST_BATCH_OPLOCK

FSCTL_REQUEST_FILTER_OPLOCK

FSCTL_REQUEST_OPLOCK_LEVEL_1

FSCTL_REQUEST_OPLOCK_LEVEL_2

FltCheckOplock

FltCurrentBatchOplock

FltInitializeOplock

FltOplockFsctrl

FltUninitializeOplock

FsRtlOplockIsFastIoPossible