HRESULT 0x801F001C (ERROR_FLT_CONTEXT_ALREADY

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Description:

the same context allocation is already attached to another Filter Manager object.

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ERROR_FLT_ALREADY_ENLISTED	ERROR_FLT_NO_WAITER_FOR_REPLY

ERROR_FLT_CONTEXT_ALREADY_LINKED

A context allocation is not a reusable template

ERROR_FLT_CONTEXT_ALREADY_LINKED means the same context object supplied as NewContext is already attached to an object after a successful FltSetXxxContext call. This differs from ERROR_FLT_CONTEXT_ALREADY_DEFINED, where the destination already owns some context and a newly allocated candidate loses the set race.

Filter Manager contexts are reference-counted objects with attachment state. One allocation cannot be installed simultaneously on several files, streams, volumes, or instances as shared mutable storage. Allocate a separate context for each target and place separately reference-counted shared data inside it when multiple contexts need to point to common policy or cache state.

Ownership corrections

Trace the address of NewContext and every successful set operation involving it.
Do not remove and immediately reuse a context unless the documented lifetime and references prove it is detached.
Allocate per-object wrappers for shared state instead of attaching one context object repeatedly.
Release caller references after successful attachment according to the set-context API contract.

References

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