diff --git a/include/ddk/wdm.h b/include/ddk/wdm.h
index 834f208cf98..127a8da9b09 100644
--- a/include/ddk/wdm.h
+++ b/include/ddk/wdm.h
@@ -44,6 +44,7 @@ typedef ULONG_PTR KSPIN_LOCK, *PKSPIN_LOCK;
 
 typedef ULONG_PTR ERESOURCE_THREAD;
 typedef ERESOURCE_THREAD *PERESOURCE_THREAD;
+typedef struct _FILE_GET_QUOTA_INFORMATION *PFILE_GET_QUOTA_INFORMATION;
 
 struct _KDPC;
 struct _KAPC;
@@ -1223,6 +1224,99 @@ typedef struct _KLOCK_QUEUE_HANDLE {
 typedef NTSTATUS (NTAPI EX_CALLBACK_FUNCTION)(void *CallbackContext, void *Argument1, void *Argument2);
 typedef EX_CALLBACK_FUNCTION *PEX_CALLBACK_FUNCTION;
 
+typedef ULONG OB_OPERATION;
+
+typedef struct _OB_PRE_CREATE_HANDLE_INFORMATION {
+    ACCESS_MASK DesiredAccess;
+    ACCESS_MASK OriginalDesiredAccess;
+} OB_PRE_CREATE_HANDLE_INFORMATION, *POB_PRE_CREATE_HANDLE_INFORMATION;
+
+typedef struct _OB_PRE_DUPLICATE_HANDLE_INFORMATION {
+    ACCESS_MASK DesiredAccess;
+    ACCESS_MASK OriginalDesiredAccess;
+    PVOID SourceProcess;
+    PVOID TargetProcess;
+} OB_PRE_DUPLICATE_HANDLE_INFORMATION, *POB_PRE_DUPLICATE_HANDLE_INFORMATION;
+
+typedef union _OB_PRE_OPERATION_PARAMETERS {
+    OB_PRE_CREATE_HANDLE_INFORMATION CreateHandleInformation;
+    OB_PRE_DUPLICATE_HANDLE_INFORMATION DuplicateHandleInformation;
+} OB_PRE_OPERATION_PARAMETERS, *POB_PRE_OPERATION_PARAMETERS;
+
+typedef struct _OB_PRE_OPERATION_INFORMATION {
+    OB_OPERATION Operation;
+    union {
+        ULONG Flags;
+        struct {
+            ULONG KernelHandle:1;
+            ULONG Reserved:31;
+        } DUMMYSTRUCTNAME;
+    } DUMMYUNIONNAME;
+    PVOID Object;
+    POBJECT_TYPE ObjectType;
+    PVOID CallContext;
+    POB_PRE_OPERATION_PARAMETERS Parameters;
+} OB_PRE_OPERATION_INFORMATION, *POB_PRE_OPERATION_INFORMATION;
+
+typedef struct _OB_POST_CREATE_HANDLE_INFORMATION {
+    ACCESS_MASK GrantedAccess;
+} OB_POST_CREATE_HANDLE_INFORMATION, *POB_POST_CREATE_HANDLE_INFORMATION;
+
+typedef struct _OB_POST_DUPLICATE_HANDLE_INFORMATION {
+    ACCESS_MASK GrantedAccess;
+} OB_POST_DUPLICATE_HANDLE_INFORMATION, *POB_POST_DUPLICATE_HANDLE_INFORMATION;
+
+typedef union _OB_POST_OPERATION_PARAMETERS {
+    OB_POST_CREATE_HANDLE_INFORMATION CreateHandleInformation;
+    OB_POST_DUPLICATE_HANDLE_INFORMATION DuplicateHandleInformation;
+} OB_POST_OPERATION_PARAMETERS, *POB_POST_OPERATION_PARAMETERS;
+
+typedef struct _OB_POST_OPERATION_INFORMATION {
+    OB_OPERATION Operation;
+    union {
+        ULONG Flags;
+        struct {
+            ULONG KernelHandle:1;
+            ULONG Reserved:31;
+        } DUMMYSTRUCTNAME;
+    } DUMMYUNIONNAME;
+    PVOID Object;
+    POBJECT_TYPE ObjectType;
+    PVOID CallContext;
+    NTSTATUS ReturnStatus;
+    POB_POST_OPERATION_PARAMETERS Parameters;
+} OB_POST_OPERATION_INFORMATION,*POB_POST_OPERATION_INFORMATION;
+
+typedef enum _OB_PREOP_CALLBACK_STATUS {
+    OB_PREOP_SUCCESS
+} OB_PREOP_CALLBACK_STATUS, *POB_PREOP_CALLBACK_STATUS;
+
+typedef OB_PREOP_CALLBACK_STATUS (WINAPI *POB_PRE_OPERATION_CALLBACK)(void *context, POB_PRE_OPERATION_INFORMATION information);
+typedef void (WINAPI *POB_POST_OPERATION_CALLBACK)(void *context, POB_POST_OPERATION_INFORMATION information);
+
+typedef struct _OB_OPERATION_REGISTRATION {
+    POBJECT_TYPE *ObjectType;
+    OB_OPERATION Operations;
+    POB_PRE_OPERATION_CALLBACK PreOperation;
+    POB_POST_OPERATION_CALLBACK PostOperation;
+} OB_OPERATION_REGISTRATION, *POB_OPERATION_REGISTRATION;
+
+typedef struct _OB_CALLBACK_REGISTRATION {
+    USHORT Version;
+    USHORT OperationRegistrationCount;
+    UNICODE_STRING Altitude;
+    PVOID RegistrationContext;
+    OB_OPERATION_REGISTRATION *OperationRegistration;
+} OB_CALLBACK_REGISTRATION, *POB_CALLBACK_REGISTRATION;
+
+#define OB_FLT_REGISTRATION_VERSION_0100  0x0100
+#define OB_FLT_REGISTRATION_VERSION OB_FLT_REGISTRATION_VERSION_0100
+
+typedef enum _DIRECTORY_NOTIFY_INFORMATION_CLASS {
+    DirectoryNotifyInformation = 1,
+    DirectoryNotifyExtendedInformation
+} DIRECTORY_NOTIFY_INFORMATION_CLASS, *PDIRECTORY_NOTIFY_INFORMATION_CLASS;
+
 NTSTATUS WINAPI ObCloseHandle(IN HANDLE handle);
 
 #ifdef NONAMELESSUNION