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
| Requirement | Value |
|---|---|
| Target Platform | Universal |
| Header | fltkernel.h (include Fltkernel.h) |
| Library | FltMgr.lib |
| DLL | Fltmgr.sys |
| IRQL | <= APC_LEVEL |
See also
FSCTL_OPBATCH_ACK_CLOSE_PENDING