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Opportunistic Lock Operations

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If an application requests opportunistic locks, all files for which it requests locks must be opened for overlapped (asynchronous) input and output by using the CreateFile function with the FILE_FLAG_OVERLAPPED flag. After the files are opened for overlapped operation, you can use the DeviceIoControl function with one of the following control codes to work with those files' opportunistic locks:

FSCTL_OPBATCH_ACK_CLOSE_PENDING
FSCTL_OPLOCK_BREAK_ACK_NO_2
FSCTL_OPLOCK_BREAK_ACKNOWLEDGE
FSCTL_OPLOCK_BREAK_NOTIFY
FSCTL_REQUEST_BATCH_OPLOCK
FSCTL_REQUEST_FILTER_OPLOCK
FSCTL_REQUEST_OPLOCK
FSCTL_REQUEST_OPLOCK_LEVEL_1
FSCTL_REQUEST_OPLOCK_LEVEL_2