FSCTL_OPLOCK_BREAK_ACKNOWLEDGE control code
The FSCTL_OPLOCK_BREAK_ACKNOWLEDGE control code responds to notification that an exclusive (level 1, batch, or filter) opportunistic lock (oplock) on a file has been broken.
A client application sends this control code to indicate that it acknowledges the oplock break and that, if the oplock is a level 1 oplock that was broken to level 2, it does want the level 2 oplock.
To process this control code, a minifilter calls FltOplockFsctrl with the following parameters. A file system or legacy filter driver calls FsRtlOplockFsctrl.
For more information about opportunistic locking and about the FSCTL_OPLOCK_BREAK_ACKNOWLEDGE control code, see the Microsoft Windows SDK documentation.
Parameters
Oplock: Opaque oplock object pointer for the file.
CallbackData: FltOplockFsctrl only. Callback data (FLT_CALLBACK_DATA) structure for an IRP_MJ_FILE_SYSTEM_CONTROL FSCTL request. The FsControlCode parameter for the operation must be FSCTL_OPLOCK_BREAK_ACKNOWLEDGE.
Irp: FsRtlOplockFsctrl only. IRP for an IRP_MJ_FILE_SYSTEM_CONTROL FSCTL request. The FsControlCode parameter for the operation must be FSCTL_OPLOCK_BREAK_ACKNOWLEDGE.
OpenCount: Not used with this operation; set to zero.
Status block
FltOplockFsctrl returns FLT_PREOP_PENDING for this operation when a level 1 oplock is broken to level 2, and the level 2 oplock has been granted. Otherwise, it returns FLT_PREOP_COMPLETE.
FsRtlOplockFsctrl returns one of the following NTSTATUS values for this operation:
| Code | Meaning |
|---|---|
| STATUS_SUCCESS | The oplock break is acknowledged. No remaining oplocks are held. |
| STATUS_INVALID_OPLOCK_PROTOCOL | No oplock was held by this handle, or the oplock break is not currently in progress. This is an error code. |
| STATUS_PENDING | The oplock break is acknowledged. On return, the sender of the FSCTL_OPLOCK_BREAK_ACKNOWLEDGE control code holds a level 2 oplock. This is a success code. |
Requirements
| Requirement type | Requirement |
|---|---|
| Header | Ntifs.h (include Ntifs.h or Fltkernel.h) |
See also
FLT_PARAMETERS for IRP_MJ_FILE_SYSTEM_CONTROL