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The following oplock break conditions apply on every byte range lock operation on the given stream.
Conditions for a Level 2 request type
Always break to None.
No acknowledgment is required; the operation proceeds immediately.
Conditions for a Filter request type
The oplock is not broken.
No acknowledgement is required, and the operation proceeds immediately.
Conditions for Level 1, Batch, Read, Read-Handle, Read-Write, and Read-Write-Handle request types
Break on IRP_MJ_LOCK_CONTROL when the lock operation occurs on a FILE_OBJECT with an oplock key that differs from the key of the FILE_OBJECT that owns the oplock. If the oplock is broken, break to None.
Acknowledgement requirements vary as follows:
Read request: No acknowledgment is required; the operation proceeds immediately.
Read-Handle and Read-Write-Handle requests: Although acknowledgment of the break is required, the operation continues immediately (for example, without waiting for the acknowledgment).
Level 1, Batch, and Read-Write requests: An acknowledgement must be received before the operations continues.