2 * PROJECT: ReactOS Kernel
3 * LICENSE: GPL - See COPYING in the top level directory
4 * FILE: ntoskrnl/io/iomgr/irp.c
5 * PURPOSE: IRP Handling Functions
6 * PROGRAMMERS: Alex Ionescu (alex.ionescu@reactos.org)
8 * Filip Navara (navaraf@reactos.org)
11 /* INCLUDES ****************************************************************/
19 /* PRIVATE FUNCTIONS ********************************************************/
23 IopFreeIrpKernelApc(IN PKAPC Apc
,
24 IN PKNORMAL_ROUTINE
*NormalRoutine
,
25 IN PVOID
*NormalContext
,
26 IN PVOID
*SystemArgument1
,
27 IN PVOID
*SystemArgument2
)
30 IoFreeIrp(CONTAINING_RECORD(Apc
, IRP
, Tail
.Apc
));
35 IopAbortIrpKernelApc(IN PKAPC Apc
)
38 IoFreeIrp(CONTAINING_RECORD(Apc
, IRP
, Tail
.Apc
));
43 IopCleanupFailedIrp(IN PFILE_OBJECT FileObject
,
44 IN PKEVENT EventObject OPTIONAL
,
45 IN PVOID Buffer OPTIONAL
)
49 /* Dereference the event */
50 if (EventObject
) ObDereferenceObject(EventObject
);
52 /* Free a buffer, if any */
53 if (Buffer
) ExFreePool(Buffer
);
55 /* If this was a file opened for synch I/O, then unlock it */
56 if (FileObject
->Flags
& FO_SYNCHRONOUS_IO
) IopUnlockFileObject(FileObject
);
58 /* Now dereference it and return */
59 ObDereferenceObject(FileObject
);
60 return STATUS_INSUFFICIENT_RESOURCES
;
65 IopAbortInterruptedIrp(IN PKEVENT EventObject
,
73 /* Raise IRQL to APC */
74 KeRaiseIrql(APC_LEVEL
, &OldIrql
);
76 /* Check if nobody completed it yet */
77 if (!KeReadStateEvent(EventObject
))
79 /* First, cancel it */
80 CancelResult
= IoCancelIrp(Irp
);
83 /* Check if we cancelled it */
86 /* Wait for the IRP to be cancelled */
87 Wait
.QuadPart
= -100000;
88 while (!KeReadStateEvent(EventObject
))
90 /* Delay indefintely */
91 KeDelayExecutionThread(KernelMode
, FALSE
, &Wait
);
96 /* No cancellation done, so wait for the I/O system to kill it */
97 KeWaitForSingleObject(EventObject
,
106 /* We got preempted, so give up */
107 KeLowerIrql(OldIrql
);
113 IopDisassociateThreadIrp(VOID
)
115 KIRQL OldIrql
, LockIrql
;
117 PLIST_ENTRY IrpEntry
;
118 PIO_ERROR_LOG_PACKET ErrorLogEntry
;
119 PDEVICE_OBJECT DeviceObject
= NULL
;
120 PIO_STACK_LOCATION IoStackLocation
;
122 /* First, raise to APC to protect IrpList */
123 KeRaiseIrql(APC_LEVEL
, &OldIrql
);
125 /* Get the Thread and check the list */
126 IrpThread
= PsGetCurrentThread();
127 if (IsListEmpty(&IrpThread
->IrpList
))
129 /* It got completed now, so quit */
130 KeLowerIrql(OldIrql
);
134 /* Ensure no one will come disturb */
135 LockIrql
= KeAcquireQueuedSpinLock(LockQueueIoCompletionLock
);
137 /* Get the misbehaving IRP */
138 IrpEntry
= IrpThread
->IrpList
.Flink
;
139 IopDeadIrp
= CONTAINING_RECORD(IrpEntry
, IRP
, ThreadListEntry
);
140 IOTRACE(IO_IRP_DEBUG
,
141 "%s - Deassociating IRP %p for %p\n",
146 /* Don't cancel the IRP if it's already been completed far */
147 if (IopDeadIrp
->CurrentLocation
== (IopDeadIrp
->StackCount
+ 2))
150 KeReleaseQueuedSpinLock(LockQueueIoCompletionLock
, LockIrql
);
151 KeLowerIrql(OldIrql
);
155 /* Disown the IRP! */
156 IopDeadIrp
->Tail
.Overlay
.Thread
= NULL
;
157 RemoveHeadList(&IrpThread
->IrpList
);
158 InitializeListHead(&IopDeadIrp
->ThreadListEntry
);
160 /* Get the stack location and check if it's valid */
161 IoStackLocation
= IoGetCurrentIrpStackLocation(IopDeadIrp
);
162 if (IopDeadIrp
->CurrentLocation
<= IopDeadIrp
->StackCount
)
164 /* Get the device object */
165 DeviceObject
= IoStackLocation
->DeviceObject
;
168 KeReleaseQueuedSpinLock(LockQueueIoCompletionLock
, LockIrql
);
169 /* Lower IRQL now, since we have the pointers we need */
170 KeLowerIrql(OldIrql
);
172 /* Check if we can send an Error Log Entry*/
175 /* Allocate an entry */
176 ErrorLogEntry
= IoAllocateErrorLogEntry(DeviceObject
,
177 sizeof(IO_ERROR_LOG_PACKET
));
180 /* Write the entry */
181 ErrorLogEntry
->ErrorCode
= IO_DRIVER_CANCEL_TIMEOUT
;
182 IoWriteErrorLogEntry(ErrorLogEntry
);
189 IopCleanupIrp(IN PIRP Irp
,
190 IN PFILE_OBJECT FileObject
)
193 IOTRACE(IO_IRP_DEBUG
,
194 "%s - Cleaning IRP %p for %p\n",
199 /* Check if there's an MDL */
200 while ((Mdl
= Irp
->MdlAddress
))
202 /* Clear all of them */
203 Irp
->MdlAddress
= Mdl
->Next
;
207 /* Check if the IRP has system buffer */
208 if (Irp
->Flags
& IRP_DEALLOCATE_BUFFER
)
210 /* Free the buffer */
211 ExFreePoolWithTag(Irp
->AssociatedIrp
.SystemBuffer
, TAG_SYS_BUF
);
214 /* Check if this IRP has a user event, a file object, and is async */
215 if ((Irp
->UserEvent
) &&
216 !(Irp
->Flags
& IRP_SYNCHRONOUS_API
) &&
219 /* Dereference the User Event */
220 ObDereferenceObject(Irp
->UserEvent
);
223 /* Check if we have a file object and this isn't a create operation */
224 if ((FileObject
) && !(Irp
->Flags
& IRP_CREATE_OPERATION
))
226 /* Dereference the file object */
227 ObDereferenceObject(FileObject
);
236 IopCompleteRequest(IN PKAPC Apc
,
237 IN PKNORMAL_ROUTINE
* NormalRoutine
,
238 IN PVOID
* NormalContext
,
239 IN PVOID
* SystemArgument1
,
240 IN PVOID
* SystemArgument2
)
242 PFILE_OBJECT FileObject
;
245 PVOID Port
= NULL
, Key
= NULL
;
246 BOOLEAN SignaledCreateRequest
= FALSE
;
248 /* Get data from the APC */
249 FileObject
= (PFILE_OBJECT
)*SystemArgument1
;
250 Irp
= CONTAINING_RECORD(Apc
, IRP
, Tail
.Apc
);
251 IOTRACE(IO_IRP_DEBUG
,
252 "%s - Completing IRP %p for %p\n",
258 ASSERT(Irp
->IoStatus
.Status
!= (NTSTATUS
)0xFFFFFFFF);
260 /* Check if we have a file object */
261 if (*SystemArgument2
)
263 /* Check if we're reparsing */
264 if ((Irp
->IoStatus
.Status
== STATUS_REPARSE
) &&
265 (Irp
->IoStatus
.Information
== IO_REPARSE_TAG_MOUNT_POINT
))
267 /* We should never get this yet */
268 DPRINT1("Reparse support not yet present!\n");
273 /* Handle Buffered case first */
274 if (Irp
->Flags
& IRP_BUFFERED_IO
)
276 /* Check if we have an input buffer and if we succeeded */
277 if ((Irp
->Flags
& IRP_INPUT_OPERATION
) &&
278 (Irp
->IoStatus
.Status
!= STATUS_VERIFY_REQUIRED
) &&
279 !(NT_ERROR(Irp
->IoStatus
.Status
)))
281 /* Copy the buffer back to the user */
282 RtlCopyMemory(Irp
->UserBuffer
,
283 Irp
->AssociatedIrp
.SystemBuffer
,
284 Irp
->IoStatus
.Information
);
287 /* Also check if we should de-allocate it */
288 if (Irp
->Flags
& IRP_DEALLOCATE_BUFFER
)
291 ExFreePool(Irp
->AssociatedIrp
.SystemBuffer
);
295 /* Now we got rid of these two... */
296 Irp
->Flags
&= ~(IRP_BUFFERED_IO
| IRP_DEALLOCATE_BUFFER
);
298 /* Check if there's an MDL */
299 for (Mdl
= Irp
->MdlAddress
; Mdl
; Mdl
= NextMdl
)
307 Irp
->MdlAddress
= NULL
;
310 * Check if either the request was completed without any errors
311 * (but warnings are OK!), or if it was completed with an error, but
312 * did return from a pending I/O Operation and is not synchronous.
314 if (!(NT_ERROR(Irp
->IoStatus
.Status
)) ||
315 (NT_ERROR(Irp
->IoStatus
.Status
) &&
316 (Irp
->PendingReturned
) &&
317 !(IsIrpSynchronous(Irp
, FileObject
))))
319 /* Get any information we need from the FO before we kill it */
320 if ((FileObject
) && (FileObject
->CompletionContext
))
322 /* Save Completion Data */
323 Port
= FileObject
->CompletionContext
->Port
;
324 Key
= FileObject
->CompletionContext
->Key
;
327 /* Use SEH to make sure we don't write somewhere invalid */
330 /* Save the IOSB Information */
331 *Irp
->UserIosb
= Irp
->IoStatus
;
333 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER
)
335 /* Ignore any error */
339 /* Check if we have an event or a file object */
342 /* At the very least, this is a PKEVENT, so signal it always */
343 KeSetEvent(Irp
->UserEvent
, 0, FALSE
);
345 /* Check if we also have a File Object */
348 /* Check if this is an Asynch API */
349 if (!(Irp
->Flags
& IRP_SYNCHRONOUS_API
))
351 /* Dereference the event */
352 ObDereferenceObject(Irp
->UserEvent
);
356 * Now, if this is a Synch I/O File Object, then this event is
357 * NOT an actual Executive Event, so we won't dereference it,
358 * and instead, we will signal the File Object
360 if ((FileObject
->Flags
& FO_SYNCHRONOUS_IO
) &&
361 !(Irp
->Flags
& IRP_OB_QUERY_NAME
))
363 /* Signal the file object and set the status */
364 KeSetEvent(&FileObject
->Event
, 0, FALSE
);
365 FileObject
->FinalStatus
= Irp
->IoStatus
.Status
;
369 * This could also be a create operation, in which case we want
370 * to make sure there's no APC fired.
372 if (Irp
->Flags
& IRP_CREATE_OPERATION
)
374 /* Clear the APC Routine and remember this */
375 Irp
->Overlay
.AsynchronousParameters
.UserApcRoutine
= NULL
;
376 SignaledCreateRequest
= TRUE
;
382 /* Signal the file object and set the status */
383 KeSetEvent(&FileObject
->Event
, 0, FALSE
);
384 FileObject
->FinalStatus
= Irp
->IoStatus
.Status
;
387 * This could also be a create operation, in which case we want
388 * to make sure there's no APC fired.
390 if (Irp
->Flags
& IRP_CREATE_OPERATION
)
392 /* Clear the APC Routine and remember this */
393 Irp
->Overlay
.AsynchronousParameters
.UserApcRoutine
= NULL
;
394 SignaledCreateRequest
= TRUE
;
398 /* Update transfer count for everything but create operation */
399 if (!(Irp
->Flags
& IRP_CREATE_OPERATION
))
401 if (Irp
->Flags
& IRP_WRITE_OPERATION
)
403 /* Update write transfer count */
404 IopUpdateTransferCount(IopWriteTransfer
,
405 (ULONG
)Irp
->IoStatus
.Information
);
407 else if (Irp
->Flags
& IRP_READ_OPERATION
)
409 /* Update read transfer count */
410 IopUpdateTransferCount(IopReadTransfer
,
411 (ULONG
)Irp
->IoStatus
.Information
);
415 /* Update other transfer count */
416 IopUpdateTransferCount(IopOtherTransfer
,
417 (ULONG
)Irp
->IoStatus
.Information
);
421 /* Now that we've signaled the events, de-associate the IRP */
422 IopUnQueueIrpFromThread(Irp
);
424 /* Now check if a User APC Routine was requested */
425 if (Irp
->Overlay
.AsynchronousParameters
.UserApcRoutine
)
428 KeInitializeApc(&Irp
->Tail
.Apc
,
429 KeGetCurrentThread(),
430 CurrentApcEnvironment
,
432 IopAbortIrpKernelApc
,
433 (PKNORMAL_ROUTINE
)Irp
->
434 Overlay
.AsynchronousParameters
.UserApcRoutine
,
437 Overlay
.AsynchronousParameters
.UserApcContext
);
440 KeInsertQueueApc(&Irp
->Tail
.Apc
, Irp
->UserIosb
, NULL
, 2);
443 (Irp
->Overlay
.AsynchronousParameters
.UserApcContext
))
445 /* We have an I/O Completion setup... create the special Overlay */
446 Irp
->Tail
.CompletionKey
= Key
;
447 Irp
->Tail
.Overlay
.PacketType
= IopCompletionPacketIrp
;
448 KeInsertQueue(Port
, &Irp
->Tail
.Overlay
.ListEntry
);
452 /* Free the IRP since we don't need it anymore */
456 /* Check if we have a file object that wasn't part of a create */
457 if ((FileObject
) && !(SignaledCreateRequest
))
459 /* Dereference it, since it's not needed anymore either */
460 ObDereferenceObjectDeferDelete(FileObject
);
466 * Either we didn't return from the request, or we did return but this
467 * request was synchronous.
469 if ((Irp
->PendingReturned
) && (FileObject
))
471 /* So we did return with a synch operation, was it the IRP? */
472 if (Irp
->Flags
& IRP_SYNCHRONOUS_API
)
474 /* Yes, this IRP was synchronous, so return the I/O Status */
475 *Irp
->UserIosb
= Irp
->IoStatus
;
477 /* Now check if the user gave an event */
481 KeSetEvent(Irp
->UserEvent
, 0, FALSE
);
485 /* No event was given, so signal the FO instead */
486 KeSetEvent(&FileObject
->Event
, 0, FALSE
);
492 * It's not the IRP that was synchronous, it was the FO
493 * that was opened this way. Signal its event.
495 FileObject
->FinalStatus
= Irp
->IoStatus
.Status
;
496 KeSetEvent(&FileObject
->Event
, 0, FALSE
);
500 /* Now that we got here, we do this for incomplete I/Os as well */
501 if ((FileObject
) && !(Irp
->Flags
& IRP_CREATE_OPERATION
))
503 /* Dereference the File Object unless this was a create */
504 ObDereferenceObjectDeferDelete(FileObject
);
508 * Check if this was an Executive Event (remember that we know this
509 * by checking if the IRP is synchronous)
511 if ((Irp
->UserEvent
) &&
513 !(Irp
->Flags
& IRP_SYNCHRONOUS_API
))
515 /* This isn't a PKEVENT, so dereference it */
516 ObDereferenceObject(Irp
->UserEvent
);
519 /* Now that we've signaled the events, de-associate the IRP */
520 IopUnQueueIrpFromThread(Irp
);
522 /* Free the IRP as well */
527 /* FUNCTIONS *****************************************************************/
534 IoAllocateIrp(IN CCHAR StackSize
,
535 IN BOOLEAN ChargeQuota
)
538 USHORT Size
= IoSizeOfIrp(StackSize
);
541 PNPAGED_LOOKASIDE_LIST List
= NULL
;
542 PP_NPAGED_LOOKASIDE_NUMBER ListType
= LookasideSmallIrpList
;
544 /* Set Charge Quota Flag */
545 if (ChargeQuota
) Flags
|= IRP_QUOTA_CHARGED
;
547 /* FIXME: Implement Lookaside Floats */
549 /* Figure out which Lookaside List to use */
550 if ((StackSize
<= 8) && (ChargeQuota
== FALSE
))
552 /* Set Fixed Size Flag */
553 Flags
= IRP_ALLOCATED_FIXED_SIZE
;
555 /* See if we should use big list */
558 Size
= IoSizeOfIrp(8);
559 ListType
= LookasideLargeIrpList
;
563 Prcb
= KeGetCurrentPrcb();
565 /* Get the P List First */
566 List
= (PNPAGED_LOOKASIDE_LIST
)Prcb
->PPLookasideList
[ListType
].P
;
568 /* Attempt allocation */
569 List
->L
.TotalAllocates
++;
570 Irp
= (PIRP
)InterlockedPopEntrySList(&List
->L
.ListHead
);
572 /* Check if the P List failed */
575 /* Let the balancer know */
576 List
->L
.AllocateMisses
++;
579 List
= (PNPAGED_LOOKASIDE_LIST
)Prcb
->PPLookasideList
[ListType
].L
;
580 List
->L
.TotalAllocates
++;
581 Irp
= (PIRP
)InterlockedPopEntrySList(&List
->L
.ListHead
);
585 /* Check if we have to use the pool */
588 /* Did we try lookaside and fail? */
589 if (Flags
& IRP_ALLOCATED_FIXED_SIZE
) List
->L
.AllocateMisses
++;
591 /* Check if we should charge quota */
594 /* Irp = ExAllocatePoolWithQuotaTag(NonPagedPool, Size, TAG_IRP); */
596 Irp
= ExAllocatePoolWithTag(NonPagedPool
, Size
, TAG_IRP
);
600 /* Allocate the IRP With no Quota charge */
601 Irp
= ExAllocatePoolWithTag(NonPagedPool
, Size
, TAG_IRP
);
604 /* Make sure it was sucessful */
605 if (!Irp
) return(NULL
);
609 /* In this case there is no charge quota */
610 Flags
&= ~IRP_QUOTA_CHARGED
;
613 /* Now Initialize it */
614 IoInitializeIrp(Irp
, Size
, StackSize
);
616 /* Set the Allocation Flags */
617 Irp
->AllocationFlags
= Flags
;
620 IOTRACE(IO_IRP_DEBUG
,
621 "%s - Allocated IRP %p with allocation flags %lx\n",
633 IoBuildAsynchronousFsdRequest(IN ULONG MajorFunction
,
634 IN PDEVICE_OBJECT DeviceObject
,
637 IN PLARGE_INTEGER StartingOffset
,
638 IN PIO_STATUS_BLOCK IoStatusBlock
)
641 PIO_STACK_LOCATION StackPtr
;
644 Irp
= IoAllocateIrp(DeviceObject
->StackSize
, FALSE
);
645 if (!Irp
) return NULL
;
648 StackPtr
= IoGetNextIrpStackLocation(Irp
);
650 /* Write the Major function and then deal with it */
651 StackPtr
->MajorFunction
= (UCHAR
)MajorFunction
;
653 /* Do not handle the following here */
654 if ((MajorFunction
!= IRP_MJ_FLUSH_BUFFERS
) &&
655 (MajorFunction
!= IRP_MJ_SHUTDOWN
) &&
656 (MajorFunction
!= IRP_MJ_PNP
) &&
657 (MajorFunction
!= IRP_MJ_POWER
))
659 /* Check if this is Buffered IO */
660 if (DeviceObject
->Flags
& DO_BUFFERED_IO
)
662 /* Allocate the System Buffer */
663 Irp
->AssociatedIrp
.SystemBuffer
=
664 ExAllocatePoolWithTag(NonPagedPool
, Length
, TAG_SYS_BUF
);
665 if (!Irp
->AssociatedIrp
.SystemBuffer
)
667 /* Free the IRP and fail */
673 Irp
->Flags
= IRP_BUFFERED_IO
| IRP_DEALLOCATE_BUFFER
;
675 /* Handle special IRP_MJ_WRITE Case */
676 if (MajorFunction
== IRP_MJ_WRITE
)
678 /* Copy the buffer data */
679 RtlCopyMemory(Irp
->AssociatedIrp
.SystemBuffer
, Buffer
, Length
);
683 /* Set the Input Operation flag and set this as a User Buffer */
684 Irp
->Flags
|= IRP_INPUT_OPERATION
;
685 Irp
->UserBuffer
= Buffer
;
688 else if (DeviceObject
->Flags
& DO_DIRECT_IO
)
690 /* Use an MDL for Direct I/O */
691 Irp
->MdlAddress
= IoAllocateMdl(Buffer
,
696 if (!Irp
->MdlAddress
)
698 /* Free the IRP and fail */
707 MmProbeAndLockPages(Irp
->MdlAddress
,
709 MajorFunction
== IRP_MJ_READ
?
710 IoWriteAccess
: IoReadAccess
);
712 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER
)
714 /* Free the IRP and its MDL */
715 IoFreeMdl(Irp
->MdlAddress
);
719 _SEH2_YIELD(return NULL
);
725 /* Neither, use the buffer */
726 Irp
->UserBuffer
= Buffer
;
729 /* Check if this is a read */
730 if (MajorFunction
== IRP_MJ_READ
)
732 /* Set the parameters for a read */
733 StackPtr
->Parameters
.Read
.Length
= Length
;
734 StackPtr
->Parameters
.Read
.ByteOffset
= *StartingOffset
;
736 else if (MajorFunction
== IRP_MJ_WRITE
)
738 /* Otherwise, set write parameters */
739 StackPtr
->Parameters
.Write
.Length
= Length
;
740 StackPtr
->Parameters
.Write
.ByteOffset
= *StartingOffset
;
744 /* Set the Current Thread and IOSB */
745 Irp
->UserIosb
= IoStatusBlock
;
746 Irp
->Tail
.Overlay
.Thread
= PsGetCurrentThread();
749 IOTRACE(IO_IRP_DEBUG
,
750 "%s - Built IRP %p with Major, Buffer, DO %lx %p %p\n",
764 IoBuildDeviceIoControlRequest(IN ULONG IoControlCode
,
765 IN PDEVICE_OBJECT DeviceObject
,
766 IN PVOID InputBuffer
,
767 IN ULONG InputBufferLength
,
768 IN PVOID OutputBuffer
,
769 IN ULONG OutputBufferLength
,
770 IN BOOLEAN InternalDeviceIoControl
,
772 IN PIO_STATUS_BLOCK IoStatusBlock
)
775 PIO_STACK_LOCATION StackPtr
;
779 Irp
= IoAllocateIrp(DeviceObject
->StackSize
, FALSE
);
780 if (!Irp
) return NULL
;
783 StackPtr
= IoGetNextIrpStackLocation(Irp
);
785 /* Set the DevCtl Type */
786 StackPtr
->MajorFunction
= InternalDeviceIoControl
?
787 IRP_MJ_INTERNAL_DEVICE_CONTROL
:
788 IRP_MJ_DEVICE_CONTROL
;
790 /* Set the IOCTL Data */
791 StackPtr
->Parameters
.DeviceIoControl
.IoControlCode
= IoControlCode
;
792 StackPtr
->Parameters
.DeviceIoControl
.InputBufferLength
= InputBufferLength
;
793 StackPtr
->Parameters
.DeviceIoControl
.OutputBufferLength
=
796 /* Handle the Methods */
797 switch (IO_METHOD_FROM_CTL_CODE(IoControlCode
))
800 case METHOD_BUFFERED
:
802 /* Select the right Buffer Length */
803 BufferLength
= InputBufferLength
> OutputBufferLength
?
804 InputBufferLength
: OutputBufferLength
;
806 /* Make sure there is one */
809 /* Allocate the System Buffer */
810 Irp
->AssociatedIrp
.SystemBuffer
=
811 ExAllocatePoolWithTag(NonPagedPool
,
814 if (!Irp
->AssociatedIrp
.SystemBuffer
)
816 /* Free the IRP and fail */
821 /* Check if we got a buffer */
824 /* Copy into the System Buffer */
825 RtlCopyMemory(Irp
->AssociatedIrp
.SystemBuffer
,
830 /* Write the flags */
831 Irp
->Flags
= IRP_BUFFERED_IO
| IRP_DEALLOCATE_BUFFER
;
832 if (OutputBuffer
) Irp
->Flags
|= IRP_INPUT_OPERATION
;
834 /* Save the Buffer */
835 Irp
->UserBuffer
= OutputBuffer
;
839 /* Clear the Flags and Buffer */
841 Irp
->UserBuffer
= NULL
;
846 case METHOD_IN_DIRECT
:
847 case METHOD_OUT_DIRECT
:
849 /* Check if we got an input buffer */
852 /* Allocate the System Buffer */
853 Irp
->AssociatedIrp
.SystemBuffer
=
854 ExAllocatePoolWithTag(NonPagedPool
,
857 if (!Irp
->AssociatedIrp
.SystemBuffer
)
859 /* Free the IRP and fail */
864 /* Copy into the System Buffer */
865 RtlCopyMemory(Irp
->AssociatedIrp
.SystemBuffer
,
869 /* Write the flags */
870 Irp
->Flags
= IRP_BUFFERED_IO
| IRP_DEALLOCATE_BUFFER
;
874 /* Clear the flags */
878 /* Check if we got an output buffer */
881 /* Allocate the System Buffer */
882 Irp
->MdlAddress
= IoAllocateMdl(OutputBuffer
,
887 if (!Irp
->MdlAddress
)
889 /* Free the IRP and fail */
898 MmProbeAndLockPages(Irp
->MdlAddress
,
900 IO_METHOD_FROM_CTL_CODE(IoControlCode
) ==
902 IoReadAccess
: IoWriteAccess
);
904 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER
)
907 IoFreeMdl(Irp
->MdlAddress
);
909 /* Free the input buffer and IRP */
910 if (InputBuffer
) ExFreePool(Irp
->AssociatedIrp
.SystemBuffer
);
914 _SEH2_YIELD(return NULL
);
922 /* Just save the Buffer */
923 Irp
->UserBuffer
= OutputBuffer
;
924 StackPtr
->Parameters
.DeviceIoControl
.Type3InputBuffer
= InputBuffer
;
927 /* Now write the Event and IoSB */
928 Irp
->UserIosb
= IoStatusBlock
;
929 Irp
->UserEvent
= Event
;
931 /* Sync IRPs are queued to requestor thread's irp cancel/cleanup list */
932 Irp
->Tail
.Overlay
.Thread
= PsGetCurrentThread();
933 IoQueueThreadIrp(Irp
);
936 IOTRACE(IO_IRP_DEBUG
,
937 "%s - Built IRP %p with IOCTL, Buffers, DO %lx %p %p %p\n",
952 IoBuildSynchronousFsdRequest(IN ULONG MajorFunction
,
953 IN PDEVICE_OBJECT DeviceObject
,
956 IN PLARGE_INTEGER StartingOffset
,
958 IN PIO_STATUS_BLOCK IoStatusBlock
)
962 /* Do the big work to set up the IRP */
963 Irp
= IoBuildAsynchronousFsdRequest(MajorFunction
,
969 if (!Irp
) return NULL
;
971 /* Set the Event which makes it Syncronous */
972 Irp
->UserEvent
= Event
;
974 /* Sync IRPs are queued to requestor thread's irp cancel/cleanup list */
975 IoQueueThreadIrp(Irp
);
984 IoCancelIrp(IN PIRP Irp
)
987 PDRIVER_CANCEL CancelRoutine
;
988 IOTRACE(IO_IRP_DEBUG
,
989 "%s - Canceling IRP %p\n",
992 ASSERT(Irp
->Type
== IO_TYPE_IRP
);
994 /* Acquire the cancel lock and cancel the IRP */
995 IoAcquireCancelSpinLock(&OldIrql
);
998 /* Clear the cancel routine and get the old one */
999 CancelRoutine
= (PVOID
)IoSetCancelRoutine(Irp
, NULL
);
1002 /* We had a routine, make sure the IRP isn't completed */
1003 if (Irp
->CurrentLocation
> (Irp
->StackCount
+ 1))
1005 /* It is, bugcheck */
1006 KeBugCheckEx(CANCEL_STATE_IN_COMPLETED_IRP
,
1008 (ULONG_PTR
)CancelRoutine
,
1013 /* Set the cancel IRQL And call the routine */
1014 Irp
->CancelIrql
= OldIrql
;
1015 CancelRoutine(IoGetCurrentIrpStackLocation(Irp
)->DeviceObject
, Irp
);
1019 /* Otherwise, release the cancel lock and fail */
1020 IoReleaseCancelSpinLock(OldIrql
);
1029 IoCancelThreadIo(IN PETHREAD Thread
)
1032 ULONG Retries
= 3000;
1033 LARGE_INTEGER Interval
;
1034 PLIST_ENTRY ListHead
, NextEntry
;
1038 /* Windows isn't using given thread, but using current. */
1039 Thread
= PsGetCurrentThread();
1041 IOTRACE(IO_IRP_DEBUG
,
1042 "%s - Canceling IRPs for Thread %p\n",
1046 /* Raise to APC to protect the IrpList */
1047 KeRaiseIrql(APC_LEVEL
, &OldIrql
);
1049 /* Start by cancelling all the IRPs in the current thread queue. */
1050 ListHead
= &Thread
->IrpList
;
1051 NextEntry
= ListHead
->Flink
;
1052 while (ListHead
!= NextEntry
)
1055 Irp
= CONTAINING_RECORD(NextEntry
, IRP
, ThreadListEntry
);
1060 /* Move to the next entry */
1061 NextEntry
= NextEntry
->Flink
;
1064 /* Wait 100 milliseconds */
1065 Interval
.QuadPart
= -1000000;
1067 /* Wait till all the IRPs are completed or cancelled. */
1068 while (!IsListEmpty(&Thread
->IrpList
))
1070 /* Now we can lower */
1071 KeLowerIrql(OldIrql
);
1073 /* Wait a short while and then look if all our IRPs were completed. */
1074 KeDelayExecutionThread(KernelMode
, FALSE
, &Interval
);
1077 * Don't stay here forever if some broken driver doesn't complete
1082 /* Print out a message and remove the IRP */
1083 DPRINT1("Broken driver did not complete!\n");
1084 IopDisassociateThreadIrp();
1087 /* Raise the IRQL Again */
1088 KeRaiseIrql(APC_LEVEL
, &OldIrql
);
1091 /* We're done, lower the IRQL */
1092 KeLowerIrql(OldIrql
);
1101 IoCallDriver(IN PDEVICE_OBJECT DeviceObject
,
1105 return IofCallDriver(DeviceObject
, Irp
);
1108 #define IoCallDriver IofCallDriver
1113 #undef IoCompleteRequest
1116 IoCompleteRequest(IN PIRP Irp
,
1117 IN CCHAR PriorityBoost
)
1119 /* Call the fastcall */
1120 IofCompleteRequest(Irp
, PriorityBoost
);
1123 #define IoCompleteRequest IofCompleteRequest
1130 IoEnqueueIrp(IN PIRP Irp
)
1132 /* This is the same as calling IoQueueThreadIrp */
1133 IoQueueThreadIrp(Irp
);
1141 IofCallDriver(IN PDEVICE_OBJECT DeviceObject
,
1144 PDRIVER_OBJECT DriverObject
;
1145 PIO_STACK_LOCATION StackPtr
;
1147 /* Make sure this is a valid IRP */
1148 ASSERT(Irp
->Type
== IO_TYPE_IRP
);
1150 /* Get the Driver Object */
1151 DriverObject
= DeviceObject
->DriverObject
;
1153 /* Decrease the current location and check if */
1154 Irp
->CurrentLocation
--;
1155 if (Irp
->CurrentLocation
<= 0)
1157 /* This IRP ran out of stack, bugcheck */
1158 KeBugCheckEx(NO_MORE_IRP_STACK_LOCATIONS
, (ULONG_PTR
)Irp
, 0, 0, 0);
1161 /* Now update the stack location */
1162 StackPtr
= IoGetNextIrpStackLocation(Irp
);
1163 Irp
->Tail
.Overlay
.CurrentStackLocation
= StackPtr
;
1165 /* Get the Device Object */
1166 StackPtr
->DeviceObject
= DeviceObject
;
1169 return DriverObject
->MajorFunction
[StackPtr
->MajorFunction
](DeviceObject
,
1175 IopClearStackLocation(IN PIO_STACK_LOCATION IoStackLocation
)
1177 IoStackLocation
->MinorFunction
= 0;
1178 IoStackLocation
->Flags
= 0;
1179 IoStackLocation
->Control
&= SL_ERROR_RETURNED
;
1180 IoStackLocation
->Parameters
.Others
.Argument1
= 0;
1181 IoStackLocation
->Parameters
.Others
.Argument2
= 0;
1182 IoStackLocation
->Parameters
.Others
.Argument3
= 0;
1183 IoStackLocation
->FileObject
= NULL
;
1191 IofCompleteRequest(IN PIRP Irp
,
1192 IN CCHAR PriorityBoost
)
1194 PIO_STACK_LOCATION StackPtr
, LastStackPtr
;
1195 PDEVICE_OBJECT DeviceObject
;
1196 PFILE_OBJECT FileObject
;
1203 NTSTATUS ErrorCode
= STATUS_SUCCESS
;
1204 IOTRACE(IO_IRP_DEBUG
,
1205 "%s - Completing IRP %p\n",
1209 /* Make sure this IRP isn't getting completed twice or is invalid */
1210 if ((Irp
->CurrentLocation
) > (Irp
->StackCount
+ 1))
1213 KeBugCheckEx(MULTIPLE_IRP_COMPLETE_REQUESTS
, (ULONG_PTR
)Irp
, 0, 0, 0);
1216 /* Some sanity checks */
1217 ASSERT(Irp
->Type
== IO_TYPE_IRP
);
1218 ASSERT(!Irp
->CancelRoutine
);
1219 ASSERT(Irp
->IoStatus
.Status
!= STATUS_PENDING
);
1220 ASSERT(Irp
->IoStatus
.Status
!= (NTSTATUS
)0xFFFFFFFF);
1222 /* Get the last stack */
1223 LastStackPtr
= (PIO_STACK_LOCATION
)(Irp
+ 1);
1224 if (LastStackPtr
->Control
& SL_ERROR_RETURNED
)
1226 /* Get the error code */
1227 ErrorCode
= PtrToUlong(LastStackPtr
->Parameters
.Others
.Argument4
);
1231 * Start the loop with the current stack and point the IRP to the next stack
1232 * and then keep incrementing the stack as we loop through. The IRP should
1233 * always point to the next stack location w.r.t the one currently being
1234 * analyzed, so completion routine code will see the appropriate value.
1235 * Because of this, we must loop until the current stack location is +1 of
1236 * the stack count, because when StackPtr is at the end, CurrentLocation is +1.
1238 for (StackPtr
= IoGetCurrentIrpStackLocation(Irp
),
1239 Irp
->CurrentLocation
++,
1240 Irp
->Tail
.Overlay
.CurrentStackLocation
++;
1241 Irp
->CurrentLocation
<= (Irp
->StackCount
+ 1);
1243 Irp
->CurrentLocation
++,
1244 Irp
->Tail
.Overlay
.CurrentStackLocation
++)
1246 /* Set Pending Returned */
1247 Irp
->PendingReturned
= StackPtr
->Control
& SL_PENDING_RETURNED
;
1249 /* Check if we failed */
1250 if (!NT_SUCCESS(Irp
->IoStatus
.Status
))
1252 /* Check if it was changed by a completion routine */
1253 if (Irp
->IoStatus
.Status
!= ErrorCode
)
1255 /* Update the error for the current stack */
1256 ErrorCode
= Irp
->IoStatus
.Status
;
1257 StackPtr
->Control
|= SL_ERROR_RETURNED
;
1258 LastStackPtr
->Parameters
.Others
.Argument4
= UlongToPtr(ErrorCode
);
1259 LastStackPtr
->Control
|= SL_ERROR_RETURNED
;
1263 /* Check if there is a Completion Routine to Call */
1264 if ((NT_SUCCESS(Irp
->IoStatus
.Status
) &&
1265 (StackPtr
->Control
& SL_INVOKE_ON_SUCCESS
)) ||
1266 (!NT_SUCCESS(Irp
->IoStatus
.Status
) &&
1267 (StackPtr
->Control
& SL_INVOKE_ON_ERROR
)) ||
1269 (StackPtr
->Control
& SL_INVOKE_ON_CANCEL
)))
1271 /* Clear the stack location */
1272 IopClearStackLocation(StackPtr
);
1274 /* Check for highest-level device completion routines */
1275 if (Irp
->CurrentLocation
== (Irp
->StackCount
+ 1))
1277 /* Clear the DO, since the current stack location is invalid */
1278 DeviceObject
= NULL
;
1282 /* Otherwise, return the real one */
1283 DeviceObject
= IoGetCurrentIrpStackLocation(Irp
)->DeviceObject
;
1286 /* Call the completion routine */
1287 Status
= StackPtr
->CompletionRoutine(DeviceObject
,
1291 /* Don't touch the Packet in this case, since it might be gone! */
1292 if (Status
== STATUS_MORE_PROCESSING_REQUIRED
) return;
1296 /* Otherwise, check if this is a completed IRP */
1297 if ((Irp
->CurrentLocation
<= Irp
->StackCount
) &&
1298 (Irp
->PendingReturned
))
1300 /* Mark it as pending */
1301 IoMarkIrpPending(Irp
);
1304 /* Clear the stack location */
1305 IopClearStackLocation(StackPtr
);
1309 /* Check if the IRP is an associated IRP */
1310 if (Irp
->Flags
& IRP_ASSOCIATED_IRP
)
1312 /* Get the master IRP and count */
1313 MasterIrp
= Irp
->AssociatedIrp
.MasterIrp
;
1314 MasterCount
= InterlockedDecrement(&MasterIrp
->AssociatedIrp
.IrpCount
);
1317 for (Mdl
= Irp
->MdlAddress
; Mdl
; Mdl
= NextMdl
)
1319 /* Go to the next one */
1320 NextMdl
= Mdl
->Next
;
1324 /* Free the IRP itself */
1327 /* Complete the Master IRP */
1328 if (!MasterCount
) IofCompleteRequest(MasterIrp
, PriorityBoost
);
1332 /* We don't support this yet */
1333 ASSERT(Irp
->IoStatus
.Status
!= STATUS_REPARSE
);
1335 /* Check if we have an auxiliary buffer */
1336 if (Irp
->Tail
.Overlay
.AuxiliaryBuffer
)
1339 ExFreePool(Irp
->Tail
.Overlay
.AuxiliaryBuffer
);
1340 Irp
->Tail
.Overlay
.AuxiliaryBuffer
= NULL
;
1343 /* Check if this is a Paging I/O or Close Operation */
1344 if (Irp
->Flags
& (IRP_PAGING_IO
| IRP_CLOSE_OPERATION
))
1346 /* Handle a Close Operation or Sync Paging I/O */
1347 if (Irp
->Flags
& (IRP_SYNCHRONOUS_PAGING_IO
| IRP_CLOSE_OPERATION
))
1349 /* Set the I/O Status and Signal the Event */
1350 Flags
= Irp
->Flags
& (IRP_SYNCHRONOUS_PAGING_IO
| IRP_PAGING_IO
);
1351 *Irp
->UserIosb
= Irp
->IoStatus
;
1352 KeSetEvent(Irp
->UserEvent
, PriorityBoost
, FALSE
);
1354 /* Free the IRP for a Paging I/O Only, Close is handled by us */
1355 if (Flags
) IoFreeIrp(Irp
);
1361 KeInitializeApc(&Irp
->Tail
.Apc
1362 &Irp
->Tail
.Overlay
.Thread
->Tcb
,
1363 Irp
->ApcEnvironment
,
1364 IopCompletePageWrite
,
1369 KeInsertQueueApc(&Irp
->Tail
.Apc
,
1374 /* Not implemented yet. */
1375 DPRINT1("Not supported!\n");
1380 /* Get out of here */
1384 /* Unlock MDL Pages, page 167. */
1385 Mdl
= Irp
->MdlAddress
;
1392 /* Check if we should exit because of a Deferred I/O (page 168) */
1393 if ((Irp
->Flags
& IRP_DEFER_IO_COMPLETION
) && !(Irp
->PendingReturned
))
1396 * Return without queuing the completion APC, since the caller will
1397 * take care of doing its own optimized completion at PASSIVE_LEVEL.
1402 /* Get the thread and file object */
1403 Thread
= Irp
->Tail
.Overlay
.Thread
;
1404 FileObject
= Irp
->Tail
.Overlay
.OriginalFileObject
;
1406 /* Make sure the IRP isn't canceled */
1409 /* Initialize the APC */
1410 KeInitializeApc(&Irp
->Tail
.Apc
,
1412 Irp
->ApcEnvironment
,
1420 KeInsertQueueApc(&Irp
->Tail
.Apc
,
1422 NULL
, /* This is used for REPARSE stuff */
1427 /* The IRP just got canceled... does a thread still own it? */
1430 /* Yes! There is still hope! Initialize the APC */
1431 KeInitializeApc(&Irp
->Tail
.Apc
,
1433 Irp
->ApcEnvironment
,
1441 KeInsertQueueApc(&Irp
->Tail
.Apc
,
1443 NULL
, /* This is used for REPARSE stuff */
1448 /* Nothing left for us to do, kill it */
1449 ASSERT(Irp
->Cancel
);
1450 IopCleanupIrp(Irp
, FileObject
);
1457 IopSynchronousCompletion(IN PDEVICE_OBJECT DeviceObject
,
1461 if (Irp
->PendingReturned
)
1462 KeSetEvent((PKEVENT
)Context
, IO_NO_INCREMENT
, FALSE
);
1463 return STATUS_MORE_PROCESSING_REQUIRED
;
1471 IoForwardIrpSynchronously(IN PDEVICE_OBJECT DeviceObject
,
1477 /* Check if next stack location is available */
1478 if (Irp
->CurrentLocation
< Irp
->StackCount
)
1480 /* No more stack location */
1484 /* Initialize event */
1485 KeInitializeEvent(&Event
, NotificationEvent
, FALSE
);
1487 /* Copy stack location for next driver */
1488 IoCopyCurrentIrpStackLocationToNext(Irp
);
1490 /* Set a completion routine, which will signal the event */
1491 IoSetCompletionRoutine(Irp
, IopSynchronousCompletion
, &Event
, TRUE
, TRUE
, TRUE
);
1493 /* Call next driver */
1494 Status
= IoCallDriver(DeviceObject
, Irp
);
1496 /* Check if irp is pending */
1497 if (Status
== STATUS_PENDING
)
1499 /* Yes, wait for its completion */
1500 KeWaitForSingleObject(&Event
, Suspended
, KernelMode
, FALSE
, NULL
);
1503 /* Return success */
1512 IoFreeIrp(IN PIRP Irp
)
1514 PNPAGED_LOOKASIDE_LIST List
;
1515 PP_NPAGED_LOOKASIDE_NUMBER ListType
= LookasideSmallIrpList
;
1517 IOTRACE(IO_IRP_DEBUG
,
1518 "%s - Freeing IRPs %p\n",
1522 /* Make sure the Thread IRP list is empty and that it OK to free it */
1523 ASSERT(Irp
->Type
== IO_TYPE_IRP
);
1524 ASSERT(IsListEmpty(&Irp
->ThreadListEntry
));
1525 ASSERT(Irp
->CurrentLocation
>= Irp
->StackCount
);
1527 /* If this was a pool alloc, free it with the pool */
1528 if (!(Irp
->AllocationFlags
& IRP_ALLOCATED_FIXED_SIZE
))
1531 ExFreePoolWithTag(Irp
, TAG_IRP
);
1535 /* Check if this was a Big IRP */
1536 if (Irp
->StackCount
!= 1) ListType
= LookasideLargeIrpList
;
1539 Prcb
= KeGetCurrentPrcb();
1541 /* Use the P List */
1542 List
= (PNPAGED_LOOKASIDE_LIST
)Prcb
->PPLookasideList
[ListType
].P
;
1543 List
->L
.TotalFrees
++;
1545 /* Check if the Free was within the Depth or not */
1546 if (ExQueryDepthSList(&List
->L
.ListHead
) >= List
->L
.Depth
)
1548 /* Let the balancer know */
1549 List
->L
.FreeMisses
++;
1551 /* Use the L List */
1552 List
= (PNPAGED_LOOKASIDE_LIST
)Prcb
->PPLookasideList
[ListType
].L
;
1553 List
->L
.TotalFrees
++;
1555 /* Check if the Free was within the Depth or not */
1556 if (ExQueryDepthSList(&List
->L
.ListHead
) >= List
->L
.Depth
)
1558 /* All lists failed, use the pool */
1559 List
->L
.FreeMisses
++;
1560 ExFreePoolWithTag(Irp
, TAG_IRP
);
1565 /* The free was within the Depth */
1568 InterlockedPushEntrySList(&List
->L
.ListHead
,
1579 IoGetPagingIoPriority(IN PIRP Irp
)
1581 IO_PAGING_PRIORITY Priority
;
1587 /* Check what priority it has */
1588 if (Flags
& IRP_CLASS_CACHE_OPERATION
)
1591 Priority
= IoPagingPriorityHigh
;
1593 else if (Flags
& IRP_PAGING_IO
)
1595 /* Normal priority */
1596 Priority
= IoPagingPriorityNormal
;
1600 /* Invalid -- not a paging IRP */
1601 Priority
= IoPagingPriorityInvalid
;
1604 /* Return the priority */
1613 IoGetRequestorProcess(IN PIRP Irp
)
1615 /* Return the requestor process */
1616 if (Irp
->Tail
.Overlay
.Thread
)
1618 if (Irp
->ApcEnvironment
== OriginalApcEnvironment
)
1620 return Irp
->Tail
.Overlay
.Thread
->ThreadsProcess
;
1622 else if (Irp
->ApcEnvironment
== AttachedApcEnvironment
)
1624 return (PEPROCESS
)Irp
->Tail
.Overlay
.Thread
->Tcb
.ApcState
.Process
;
1636 IoGetRequestorProcessId(IN PIRP Irp
)
1640 /* Return the requestor process' id */
1641 Process
= IoGetRequestorProcess(Irp
);
1642 if (Process
) return PtrToUlong(Process
->UniqueProcessId
);
1652 IoGetRequestorSessionId(IN PIRP Irp
,
1653 OUT PULONG pSessionId
)
1657 /* Return the session */
1658 if (Irp
->Tail
.Overlay
.Thread
)
1660 Process
= Irp
->Tail
.Overlay
.Thread
->ThreadsProcess
;
1661 *pSessionId
= MmGetSessionId(Process
);
1662 return STATUS_SUCCESS
;
1665 *pSessionId
= (ULONG
)-1;
1666 return STATUS_UNSUCCESSFUL
;
1674 IoGetTopLevelIrp(VOID
)
1676 /* Return the IRP */
1677 return (PIRP
)PsGetCurrentThread()->TopLevelIrp
;
1685 IoInitializeIrp(IN PIRP Irp
,
1686 IN USHORT PacketSize
,
1690 IOTRACE(IO_IRP_DEBUG
,
1691 "%s - Initializing IRP %p\n",
1694 RtlZeroMemory(Irp
, PacketSize
);
1696 /* Set the Header and other data */
1697 Irp
->Type
= IO_TYPE_IRP
;
1698 Irp
->Size
= PacketSize
;
1699 Irp
->StackCount
= StackSize
;
1700 Irp
->CurrentLocation
= StackSize
+ 1;
1701 Irp
->ApcEnvironment
= KeGetCurrentThread()->ApcStateIndex
;
1702 Irp
->Tail
.Overlay
.CurrentStackLocation
= (PIO_STACK_LOCATION
)(Irp
+ 1) + StackSize
;
1704 /* Initialize the Thread List */
1705 InitializeListHead(&Irp
->ThreadListEntry
);
1713 IoIsOperationSynchronous(IN PIRP Irp
)
1718 /* If the IRP requests synchronous paging I/O, if the file object was opened
1719 for synchronous I/O, if the IRP_SYNCHRONOUS_API flag is set in the IRP
1720 the operation is synchronous */
1721 SynchIO
= (IoGetCurrentIrpStackLocation(Irp
)->FileObject
->Flags
& FO_SYNCHRONOUS_IO
) ||
1722 (Irp
->Flags
& IRP_SYNCHRONOUS_API
) || (Irp
->Flags
& IRP_SYNCHRONOUS_PAGING_IO
);
1724 /* If the IRP requests asynchronous paging I/O, the operation is asynchronous,
1725 even if one of the above conditions is true */
1726 ForceAsync
= (Irp
->Flags
& IRP_PAGING_IO
) && !(Irp
->Flags
& IRP_SYNCHRONOUS_PAGING_IO
);
1728 /* Check the flags */
1729 if (SynchIO
&& !ForceAsync
)
1731 /* Synch API or Paging I/O is OK, as is Sync File I/O */
1735 /* Otherwise, it is an asynchronous operation. */
1744 IoIsValidNameGraftingBuffer(IN PIRP Irp
,
1745 IN PREPARSE_DATA_BUFFER ReparseBuffer
)
1756 IoMakeAssociatedIrp(IN PIRP Irp
,
1760 IOTRACE(IO_IRP_DEBUG
,
1761 "%s - Associating IRP %p\n",
1765 /* Allocate the IRP */
1766 AssocIrp
= IoAllocateIrp(StackSize
, FALSE
);
1767 if (!AssocIrp
) return NULL
;
1770 AssocIrp
->Flags
|= IRP_ASSOCIATED_IRP
;
1772 /* Set the Thread */
1773 AssocIrp
->Tail
.Overlay
.Thread
= Irp
->Tail
.Overlay
.Thread
;
1775 /* Associate them */
1776 AssocIrp
->AssociatedIrp
.MasterIrp
= Irp
;
1785 IoQueueThreadIrp(IN PIRP Irp
)
1787 IOTRACE(IO_IRP_DEBUG
,
1788 "%s - Queueing IRP %p\n",
1792 /* Use our inlined routine */
1793 IopQueueIrpToThread(Irp
);
1798 * Reference: Chris Cant's "Writing WDM Device Drivers"
1802 IoReuseIrp(IN OUT PIRP Irp
,
1805 UCHAR AllocationFlags
;
1806 IOTRACE(IO_IRP_DEBUG
,
1807 "%s - Reusing IRP %p\n",
1811 /* Make sure it's OK to reuse it */
1812 ASSERT(!Irp
->CancelRoutine
);
1813 ASSERT(IsListEmpty(&Irp
->ThreadListEntry
));
1815 /* Get the old flags */
1816 AllocationFlags
= Irp
->AllocationFlags
;
1818 /* Reinitialize the IRP */
1819 IoInitializeIrp(Irp
, Irp
->Size
, Irp
->StackCount
);
1821 /* Duplicate the data */
1822 Irp
->IoStatus
.Status
= Status
;
1823 Irp
->AllocationFlags
= AllocationFlags
;
1831 IoSetTopLevelIrp(IN PIRP Irp
)
1834 PsGetCurrentThread()->TopLevelIrp
= (ULONG_PTR
)Irp
;
1837 #if defined (_WIN64)
1841 IN PIRP Irp OPTIONAL
)