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STATUS_CANNOT_GRANT_REQUESTED_OPLOCK
The file cannot receive the requested oplock level
This warning indicates that current file sharing or existing opens are incompatible with the exact oplock level requested. It does not necessarily mean all caching is impossible; a weaker oplock may be available.
Diagnose active opens, share modes, cached readers and writers, and whether the file system or redirector supports the requested oplock type. Retrying blindly can cause churn without changing the compatibility state.
What to inspect
- List existing opens and their share access.
- Check whether the application can accept a lower oplock level.
- Verify that filters do not keep hidden opens that prevent the requested level.
References
- Microsoft: Opportunistic locks
- Microsoft: Types of opportunistic locks
- Microsoft Open Specifications: NTSTATUS values
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