The FltOplockIsFastIoPossible routine checks a file's opportunistic lock (oplock) state to determine whether fast I/O can be performed on the file.
- Oplock [in]
Opaque oplock pointer for the file. This pointer must have been initialized by a previous call to FltInitializeOplock.
FltOplockIsFastIoPossible returns FALSE if there are outstanding oplocks on the file that prevent fast I/O from being performed; TRUE otherwise.
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.