Checking the oplock state of an FS_FILTER_ACQUIRE_FOR_SECTION_SYNCHRONIZATION operation

The FS_FILTER_ACQUIRE_FOR_SECTION_SYNCHRONIZATION operation corresponds to an FsFilter callback PreAcquireForSectionSynchronization operation. The file system receives this operation before the memory manager creates a memory-mapped section for a portion of a file.

The following oplock break conditions apply when both of the following conditions are true:

• The FS_FILTER_CALLBACK_DATA.Parameters.AcquireForSectionSynchronization.SyncType field contains SyncTypeCreateSection.
• The FS_FILTER_CALLBACK_DATA.Parameters.AcquireForSectionSynchronization.PageProtection field contains either or both of the flags PAGE_READWRITE or PAGE_EXECUTE_READWRITE.

These conditions indicate that the memory manager is creating a writeable memory-mapped section.

Conditions for Read, Read-Handle, Read-Write, and Read-Write-Handle request types

• Always break to None.
• No acknowledgment is required; the operation proceeds immediately.

Conditions for all other request types

This operation doesn't affect other (legacy) oplocks.