#ifndef _NTIOAPI_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)

// pub
typedef struct _OPLOCK_KEY_CONTEXT
{
    USHORT Version;        //  OPLOCK_KEY_VERSION_*
    USHORT Flags;          //  OPLOCK_KEY_FLAG_*
    GUID ParentOplockKey;
    GUID TargetOplockKey;
    ULONG Reserved;
} OPLOCK_KEY_CONTEXT, *POPLOCK_KEY_CONTEXT;

#endif
#endif
View code on GitHub

// ntddk.h

typedef struct _OPLOCK_KEY_CONTEXT {
  USHORT Version;
  USHORT Flags;
  GUID   ParentOplockKey;
  GUID   TargetOplockKey;
  ULONG  Reserved;
} OPLOCK_KEY_CONTEXT, *POPLOCK_KEY_CONTEXT;
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (ns-ntddk-_oplock_key_context)

Description

The OPLOCK_KEY_CONTEXT structure is returned from IoGetOplockKeyContextEx. This structure contains oplock keys for a specific file object.

Members

`Version`

The oplock key version. The version is set to one of the following values:

Value	Meaning
OPLOCK_KEY_VERSION_WIN7	This is a Windows 7 oplock key.
OPLOCK_KEY_VERSION_WIN8	This is a Windows 8 oplock key.

`Flags`

A set of flags that indicate the oplock key type. Flags is set to one or both of the following values:

Value	Meaning
OPLOCK_KEY_FLAG_PARENT_KEY	A valid oplock key is present in ParentOplockKey.
OPLOCK_KEY_FLAG_TARGET_KEY	A valid oplock key is present in TargetOplockKey.

`ParentOplockKey`

A GUID that represents the parent oplock key value.

`TargetOplockKey`

A GUID that represents the target oplock key value.

`Reserved`

Remarks

If an oplock is requested for a file during an IRP_MJ_CREATE request, a file system that supports oplocks will attach an oplock key context to the file object created. The oplock key context is later available through a pointer to an OPLOCK_KEY_CONTEXT structure. The OPLOCK_KEY_CONTEXT structure is returned from a call to IoGetOplockKeyContextEx.

OPLOCK_KEY_CONTEXT - NtDoc