30107c16949539ca63e2ecd3d6656e1b06f5009c
[reactos.git] / reactos / ntoskrnl / io / iomgr / irp.c
1 /*
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)
7 * Gunnar Dalsnes
8 * Filip Navara (navaraf@reactos.org)
9 */
10
11 /* INCLUDES ****************************************************************/
12
13 #include <ntoskrnl.h>
14 #define NDEBUG
15 #include <debug.h>
16
17 /* Undefine some macros we implement here */
18 #undef IoCallDriver
19 #undef IoCompleteRequest
20
21 /* PRIVATE FUNCTIONS ********************************************************/
22
23 VOID
24 NTAPI
25 IopFreeIrpKernelApc(IN PKAPC Apc,
26 IN PKNORMAL_ROUTINE *NormalRoutine,
27 IN PVOID *NormalContext,
28 IN PVOID *SystemArgument1,
29 IN PVOID *SystemArgument2)
30 {
31 /* Free the IRP */
32 IoFreeIrp(CONTAINING_RECORD(Apc, IRP, Tail.Apc));
33 }
34
35 VOID
36 NTAPI
37 IopAbortIrpKernelApc(IN PKAPC Apc)
38 {
39 /* Free the IRP */
40 IoFreeIrp(CONTAINING_RECORD(Apc, IRP, Tail.Apc));
41 }
42
43 NTSTATUS
44 NTAPI
45 IopCleanupFailedIrp(IN PFILE_OBJECT FileObject,
46 IN PKEVENT EventObject OPTIONAL,
47 IN PVOID Buffer OPTIONAL)
48 {
49 PAGED_CODE();
50
51 /* Dereference the event */
52 if (EventObject) ObDereferenceObject(EventObject);
53
54 /* Free a buffer, if any */
55 if (Buffer) ExFreePool(Buffer);
56
57 /* If this was a file opened for synch I/O, then unlock it */
58 if (FileObject->Flags & FO_SYNCHRONOUS_IO) IopUnlockFileObject(FileObject);
59
60 /* Now dereference it and return */
61 ObDereferenceObject(FileObject);
62 return STATUS_INSUFFICIENT_RESOURCES;
63 }
64
65 VOID
66 NTAPI
67 IopAbortInterruptedIrp(IN PKEVENT EventObject,
68 IN PIRP Irp)
69 {
70 KIRQL OldIrql;
71 BOOLEAN CancelResult;
72 LARGE_INTEGER Wait;
73 PAGED_CODE();
74
75 /* Raise IRQL to APC */
76 KeRaiseIrql(APC_LEVEL, &OldIrql);
77
78 /* Check if nobody completed it yet */
79 if (!KeReadStateEvent(EventObject))
80 {
81 /* First, cancel it */
82 CancelResult = IoCancelIrp(Irp);
83 KeLowerIrql(OldIrql);
84
85 /* Check if we cancelled it */
86 if (CancelResult)
87 {
88 /* Wait for the IRP to be cancelled */
89 Wait.QuadPart = -100000;
90 while (!KeReadStateEvent(EventObject))
91 {
92 /* Delay indefintely */
93 KeDelayExecutionThread(KernelMode, FALSE, &Wait);
94 }
95 }
96 else
97 {
98 /* No cancellation done, so wait for the I/O system to kill it */
99 KeWaitForSingleObject(EventObject,
100 Executive,
101 KernelMode,
102 FALSE,
103 NULL);
104 }
105 }
106 else
107 {
108 /* We got preempted, so give up */
109 KeLowerIrql(OldIrql);
110 }
111 }
112
113 VOID
114 NTAPI
115 IopRemoveThreadIrp(VOID)
116 {
117 KIRQL OldIrql;
118 PIRP DeadIrp;
119 PETHREAD IrpThread;
120 PLIST_ENTRY IrpEntry;
121 PIO_ERROR_LOG_PACKET ErrorLogEntry;
122 PDEVICE_OBJECT DeviceObject = NULL;
123 PIO_STACK_LOCATION IoStackLocation;
124
125 /* First, raise to APC to protect IrpList */
126 KeRaiseIrql(APC_LEVEL, &OldIrql);
127
128 /* Get the Thread and check the list */
129 IrpThread = PsGetCurrentThread();
130 if (IsListEmpty(&IrpThread->IrpList))
131 {
132 /* It got completed now, so quit */
133 KeLowerIrql(OldIrql);
134 return;
135 }
136
137 /* Get the misbehaving IRP */
138 IrpEntry = IrpThread->IrpList.Flink;
139 DeadIrp = CONTAINING_RECORD(IrpEntry, IRP, ThreadListEntry);
140 IOTRACE(IO_IRP_DEBUG,
141 "%s - Deassociating IRP %p for %p\n",
142 __FUNCTION__,
143 DeadIrp,
144 IrpThread);
145
146 /* Don't cancel the IRP if it's already been completed far */
147 if (DeadIrp->CurrentLocation == (DeadIrp->StackCount + 2))
148 {
149 /* Return */
150 KeLowerIrql(OldIrql);
151 return;
152 }
153
154 /* Disown the IRP! */
155 DeadIrp->Tail.Overlay.Thread = NULL;
156 RemoveHeadList(&IrpThread->IrpList);
157 InitializeListHead(&DeadIrp->ThreadListEntry);
158
159 /* Get the stack location and check if it's valid */
160 IoStackLocation = IoGetCurrentIrpStackLocation(DeadIrp);
161 if (DeadIrp->CurrentLocation <= DeadIrp->StackCount)
162 {
163 /* Get the device object */
164 DeviceObject = IoStackLocation->DeviceObject;
165 }
166
167 /* Lower IRQL now, since we have the pointers we need */
168 KeLowerIrql(OldIrql);
169
170 /* Check if we can send an Error Log Entry*/
171 if (DeviceObject)
172 {
173 /* Allocate an entry */
174 ErrorLogEntry = IoAllocateErrorLogEntry(DeviceObject,
175 sizeof(IO_ERROR_LOG_PACKET));
176 if (ErrorLogEntry)
177 {
178 /* Write the entry */
179 ErrorLogEntry->ErrorCode = 0xBAADF00D; /* FIXME */
180 IoWriteErrorLogEntry(ErrorLogEntry);
181 }
182 }
183 }
184
185 VOID
186 NTAPI
187 IopCleanupIrp(IN PIRP Irp,
188 IN PFILE_OBJECT FileObject)
189 {
190 PMDL Mdl;
191 IOTRACE(IO_IRP_DEBUG,
192 "%s - Cleaning IRP %p for %p\n",
193 __FUNCTION__,
194 Irp,
195 FileObject);
196
197 /* Check if there's an MDL */
198 while ((Mdl = Irp->MdlAddress))
199 {
200 /* Clear all of them */
201 Irp->MdlAddress = Mdl->Next;
202 IoFreeMdl(Mdl);
203 }
204
205 /* Check if the IRP has system buffer */
206 if (Irp->Flags & IRP_DEALLOCATE_BUFFER)
207 {
208 /* Free the buffer */
209 ExFreePoolWithTag(Irp->AssociatedIrp.SystemBuffer, TAG_SYS_BUF);
210 }
211
212 /* Check if this IRP has a user event, a file object, and is async */
213 if ((Irp->UserEvent) &&
214 !(Irp->Flags & IRP_SYNCHRONOUS_API) &&
215 (FileObject))
216 {
217 /* Dereference the User Event */
218 ObDereferenceObject(Irp->UserEvent);
219 }
220
221 /* Check if we have a file object and this isn't a create operation */
222 if ((FileObject) && !(Irp->Flags & IRP_CREATE_OPERATION))
223 {
224 /* Dereference the file object */
225 ObDereferenceObject(FileObject);
226 }
227
228 /* Free the IRP */
229 IoFreeIrp(Irp);
230 }
231
232 VOID
233 NTAPI
234 IopCompleteRequest(IN PKAPC Apc,
235 IN PKNORMAL_ROUTINE* NormalRoutine,
236 IN PVOID* NormalContext,
237 IN PVOID* SystemArgument1,
238 IN PVOID* SystemArgument2)
239 {
240 PFILE_OBJECT FileObject;
241 PIRP Irp;
242 PMDL Mdl, NextMdl;
243 PVOID Port = NULL, Key = NULL;
244 BOOLEAN SignaledCreateRequest = FALSE;
245
246 /* Get data from the APC */
247 FileObject = (PFILE_OBJECT)*SystemArgument1;
248 Irp = CONTAINING_RECORD(Apc, IRP, Tail.Apc);
249 IOTRACE(IO_IRP_DEBUG,
250 "%s - Completing IRP %p for %p\n",
251 __FUNCTION__,
252 Irp,
253 FileObject);
254
255 /* Sanity check */
256 ASSERT(Irp->IoStatus.Status != (NTSTATUS)0xFFFFFFFF);
257
258 /* Check if we have a file object */
259 if (*SystemArgument2)
260 {
261 /* Check if we're reparsing */
262 if ((Irp->IoStatus.Status == STATUS_REPARSE) &&
263 (Irp->IoStatus.Information == IO_REPARSE_TAG_MOUNT_POINT))
264 {
265 /* We should never get this yet */
266 DPRINT1("Reparse support not yet present!\n");
267 while (TRUE);
268 }
269 }
270
271 /* Handle Buffered case first */
272 if (Irp->Flags & IRP_BUFFERED_IO)
273 {
274 /* Check if we have an input buffer and if we succeeded */
275 if ((Irp->Flags & IRP_INPUT_OPERATION) &&
276 (Irp->IoStatus.Status != STATUS_VERIFY_REQUIRED) &&
277 !(NT_ERROR(Irp->IoStatus.Status)))
278 {
279 /* Copy the buffer back to the user */
280 RtlCopyMemory(Irp->UserBuffer,
281 Irp->AssociatedIrp.SystemBuffer,
282 Irp->IoStatus.Information);
283 }
284
285 /* Also check if we should de-allocate it */
286 if (Irp->Flags & IRP_DEALLOCATE_BUFFER)
287 {
288 /* Deallocate it */
289 ExFreePool(Irp->AssociatedIrp.SystemBuffer);
290 }
291 }
292
293 /* Now we got rid of these two... */
294 Irp->Flags &= ~(IRP_BUFFERED_IO | IRP_DEALLOCATE_BUFFER);
295
296 /* Check if there's an MDL */
297 for (Mdl = Irp->MdlAddress; Mdl; Mdl = NextMdl)
298 {
299 /* Free it */
300 NextMdl = Mdl->Next;
301 IoFreeMdl(Mdl);
302 }
303
304 /* No MDLs left */
305 Irp->MdlAddress = NULL;
306
307 /*
308 * Check if either the request was completed without any errors
309 * (but warnings are OK!), or if it was completed with an error, but
310 * did return from a pending I/O Operation and is not synchronous.
311 */
312 if (!(NT_ERROR(Irp->IoStatus.Status)) ||
313 (NT_ERROR(Irp->IoStatus.Status) &&
314 (Irp->PendingReturned) &&
315 !(IsIrpSynchronous(Irp, FileObject))))
316 {
317 /* Get any information we need from the FO before we kill it */
318 if ((FileObject) && (FileObject->CompletionContext))
319 {
320 /* Save Completion Data */
321 Port = FileObject->CompletionContext->Port;
322 Key = FileObject->CompletionContext->Key;
323 }
324
325 /* Use SEH to make sure we don't write somewhere invalid */
326 _SEH2_TRY
327 {
328 /* Save the IOSB Information */
329 *Irp->UserIosb = Irp->IoStatus;
330 }
331 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
332 {
333 /* Ignore any error */
334 }
335 _SEH2_END;
336
337 /* Check if we have an event or a file object */
338 if (Irp->UserEvent)
339 {
340 /* At the very least, this is a PKEVENT, so signal it always */
341 KeSetEvent(Irp->UserEvent, 0, FALSE);
342
343 /* Check if we also have a File Object */
344 if (FileObject)
345 {
346 /* Check if this is an Asynch API */
347 if (!(Irp->Flags & IRP_SYNCHRONOUS_API))
348 {
349 /* Dereference the event */
350 ObDereferenceObject(Irp->UserEvent);
351 }
352
353 /*
354 * Now, if this is a Synch I/O File Object, then this event is
355 * NOT an actual Executive Event, so we won't dereference it,
356 * and instead, we will signal the File Object
357 */
358 if ((FileObject->Flags & FO_SYNCHRONOUS_IO) &&
359 !(Irp->Flags & IRP_OB_QUERY_NAME))
360 {
361 /* Signal the file object and set the status */
362 KeSetEvent(&FileObject->Event, 0, FALSE);
363 FileObject->FinalStatus = Irp->IoStatus.Status;
364 }
365
366 /*
367 * This could also be a create operation, in which case we want
368 * to make sure there's no APC fired.
369 */
370 if (Irp->Flags & IRP_CREATE_OPERATION)
371 {
372 /* Clear the APC Routine and remember this */
373 Irp->Overlay.AsynchronousParameters.UserApcRoutine = NULL;
374 SignaledCreateRequest = TRUE;
375 }
376 }
377 }
378 else if (FileObject)
379 {
380 /* Signal the file object and set the status */
381 KeSetEvent(&FileObject->Event, 0, FALSE);
382 FileObject->FinalStatus = Irp->IoStatus.Status;
383
384 /*
385 * This could also be a create operation, in which case we want
386 * to make sure there's no APC fired.
387 */
388 if (Irp->Flags & IRP_CREATE_OPERATION)
389 {
390 /* Clear the APC Routine and remember this */
391 Irp->Overlay.AsynchronousParameters.UserApcRoutine = NULL;
392 SignaledCreateRequest = TRUE;
393 }
394 }
395
396 /* Update transfer count for everything but create operation */
397 if (!(Irp->Flags & IRP_CREATE_OPERATION))
398 {
399 if (Irp->Flags & IRP_WRITE_OPERATION)
400 {
401 /* Update write transfer count */
402 IopUpdateTransferCount(IopWriteTransfer,
403 (ULONG)Irp->IoStatus.Information);
404 }
405 else if (Irp->Flags & IRP_READ_OPERATION)
406 {
407 /* Update read transfer count */
408 IopUpdateTransferCount(IopReadTransfer,
409 (ULONG)Irp->IoStatus.Information);
410 }
411 else
412 {
413 /* Update other transfer count */
414 IopUpdateTransferCount(IopOtherTransfer,
415 (ULONG)Irp->IoStatus.Information);
416 }
417 }
418
419 /* Now that we've signaled the events, de-associate the IRP */
420 IopUnQueueIrpFromThread(Irp);
421
422 /* Now check if a User APC Routine was requested */
423 if (Irp->Overlay.AsynchronousParameters.UserApcRoutine)
424 {
425 /* Initialize it */
426 KeInitializeApc(&Irp->Tail.Apc,
427 KeGetCurrentThread(),
428 CurrentApcEnvironment,
429 IopFreeIrpKernelApc,
430 IopAbortIrpKernelApc,
431 (PKNORMAL_ROUTINE)Irp->
432 Overlay.AsynchronousParameters.UserApcRoutine,
433 Irp->RequestorMode,
434 Irp->
435 Overlay.AsynchronousParameters.UserApcContext);
436
437 /* Queue it */
438 KeInsertQueueApc(&Irp->Tail.Apc, Irp->UserIosb, NULL, 2);
439 }
440 else if ((Port) &&
441 (Irp->Overlay.AsynchronousParameters.UserApcContext))
442 {
443 /* We have an I/O Completion setup... create the special Overlay */
444 Irp->Tail.CompletionKey = Key;
445 Irp->Tail.Overlay.PacketType = IopCompletionPacketIrp;
446 KeInsertQueue(Port, &Irp->Tail.Overlay.ListEntry);
447 }
448 else
449 {
450 /* Free the IRP since we don't need it anymore */
451 IoFreeIrp(Irp);
452 }
453
454 /* Check if we have a file object that wasn't part of a create */
455 if ((FileObject) && !(SignaledCreateRequest))
456 {
457 /* Dereference it, since it's not needed anymore either */
458 ObDereferenceObjectDeferDelete(FileObject);
459 }
460 }
461 else
462 {
463 /*
464 * Either we didn't return from the request, or we did return but this
465 * request was synchronous.
466 */
467 if ((Irp->PendingReturned) && (FileObject))
468 {
469 /* So we did return with a synch operation, was it the IRP? */
470 if (Irp->Flags & IRP_SYNCHRONOUS_API)
471 {
472 /* Yes, this IRP was synchronous, so return the I/O Status */
473 *Irp->UserIosb = Irp->IoStatus;
474
475 /* Now check if the user gave an event */
476 if (Irp->UserEvent)
477 {
478 /* Signal it */
479 KeSetEvent(Irp->UserEvent, 0, FALSE);
480 }
481 else
482 {
483 /* No event was given, so signal the FO instead */
484 KeSetEvent(&FileObject->Event, 0, FALSE);
485 }
486 }
487 else
488 {
489 /*
490 * It's not the IRP that was synchronous, it was the FO
491 * that was opened this way. Signal its event.
492 */
493 FileObject->FinalStatus = Irp->IoStatus.Status;
494 KeSetEvent(&FileObject->Event, 0, FALSE);
495 }
496 }
497
498 /* Now that we got here, we do this for incomplete I/Os as well */
499 if ((FileObject) && !(Irp->Flags & IRP_CREATE_OPERATION))
500 {
501 /* Dereference the File Object unless this was a create */
502 ObDereferenceObjectDeferDelete(FileObject);
503 }
504
505 /*
506 * Check if this was an Executive Event (remember that we know this
507 * by checking if the IRP is synchronous)
508 */
509 if ((Irp->UserEvent) &&
510 (FileObject) &&
511 !(Irp->Flags & IRP_SYNCHRONOUS_API))
512 {
513 /* This isn't a PKEVENT, so dereference it */
514 ObDereferenceObject(Irp->UserEvent);
515 }
516
517 /* Now that we've signaled the events, de-associate the IRP */
518 IopUnQueueIrpFromThread(Irp);
519
520 /* Free the IRP as well */
521 IoFreeIrp(Irp);
522 }
523 }
524
525 /* FUNCTIONS *****************************************************************/
526
527 /*
528 * @implemented
529 */
530 PIRP
531 NTAPI
532 IoAllocateIrp(IN CCHAR StackSize,
533 IN BOOLEAN ChargeQuota)
534 {
535 PIRP Irp = NULL;
536 USHORT Size = IoSizeOfIrp(StackSize);
537 PKPRCB Prcb;
538 UCHAR Flags = 0;
539 PNPAGED_LOOKASIDE_LIST List = NULL;
540 PP_NPAGED_LOOKASIDE_NUMBER ListType = LookasideSmallIrpList;
541
542 /* Set Charge Quota Flag */
543 if (ChargeQuota) Flags |= IRP_QUOTA_CHARGED;
544
545 /* FIXME: Implement Lookaside Floats */
546
547 /* Figure out which Lookaside List to use */
548 if ((StackSize <= 8) && (ChargeQuota == FALSE))
549 {
550 /* Set Fixed Size Flag */
551 Flags = IRP_ALLOCATED_FIXED_SIZE;
552
553 /* See if we should use big list */
554 if (StackSize != 1)
555 {
556 Size = IoSizeOfIrp(8);
557 ListType = LookasideLargeIrpList;
558 }
559
560 /* Get the PRCB */
561 Prcb = KeGetCurrentPrcb();
562
563 /* Get the P List First */
564 List = (PNPAGED_LOOKASIDE_LIST)Prcb->PPLookasideList[ListType].P;
565
566 /* Attempt allocation */
567 List->L.TotalAllocates++;
568 Irp = (PIRP)InterlockedPopEntrySList(&List->L.ListHead);
569
570 /* Check if the P List failed */
571 if (!Irp)
572 {
573 /* Let the balancer know */
574 List->L.AllocateMisses++;
575
576 /* Try the L List */
577 List = (PNPAGED_LOOKASIDE_LIST)Prcb->PPLookasideList[ListType].L;
578 List->L.TotalAllocates++;
579 Irp = (PIRP)InterlockedPopEntrySList(&List->L.ListHead);
580 }
581 }
582
583 /* Check if we have to use the pool */
584 if (!Irp)
585 {
586 /* Did we try lookaside and fail? */
587 if (Flags & IRP_ALLOCATED_FIXED_SIZE) List->L.AllocateMisses++;
588
589 /* Check if we should charge quota */
590 if (ChargeQuota)
591 {
592 /* Irp = ExAllocatePoolWithQuotaTag(NonPagedPool, Size, TAG_IRP); */
593 /* FIXME */
594 Irp = ExAllocatePoolWithTag(NonPagedPool, Size, TAG_IRP);
595 }
596 else
597 {
598 /* Allocate the IRP With no Quota charge */
599 Irp = ExAllocatePoolWithTag(NonPagedPool, Size, TAG_IRP);
600 }
601
602 /* Make sure it was sucessful */
603 if (!Irp) return(NULL);
604 }
605 else
606 {
607 /* In this case there is no charge quota */
608 Flags &= ~IRP_QUOTA_CHARGED;
609 }
610
611 /* Now Initialize it */
612 IoInitializeIrp(Irp, Size, StackSize);
613
614 /* Set the Allocation Flags */
615 Irp->AllocationFlags = Flags;
616
617 /* Return it */
618 IOTRACE(IO_IRP_DEBUG,
619 "%s - Allocated IRP %p with allocation flags %lx\n",
620 __FUNCTION__,
621 Irp,
622 Flags);
623 return Irp;
624 }
625
626 /*
627 * @implemented
628 */
629 PIRP
630 NTAPI
631 IoBuildAsynchronousFsdRequest(IN ULONG MajorFunction,
632 IN PDEVICE_OBJECT DeviceObject,
633 IN PVOID Buffer,
634 IN ULONG Length,
635 IN PLARGE_INTEGER StartingOffset,
636 IN PIO_STATUS_BLOCK IoStatusBlock)
637 {
638 PIRP Irp;
639 PIO_STACK_LOCATION StackPtr;
640
641 /* Allocate IRP */
642 Irp = IoAllocateIrp(DeviceObject->StackSize, FALSE);
643 if (!Irp) return NULL;
644
645 /* Get the Stack */
646 StackPtr = IoGetNextIrpStackLocation(Irp);
647
648 /* Write the Major function and then deal with it */
649 StackPtr->MajorFunction = (UCHAR)MajorFunction;
650
651 /* Do not handle the following here */
652 if ((MajorFunction != IRP_MJ_FLUSH_BUFFERS) &&
653 (MajorFunction != IRP_MJ_SHUTDOWN) &&
654 (MajorFunction != IRP_MJ_PNP) &&
655 (MajorFunction != IRP_MJ_POWER))
656 {
657 /* Check if this is Buffered IO */
658 if (DeviceObject->Flags & DO_BUFFERED_IO)
659 {
660 /* Allocate the System Buffer */
661 Irp->AssociatedIrp.SystemBuffer =
662 ExAllocatePoolWithTag(NonPagedPool, Length, TAG_SYS_BUF);
663 if (!Irp->AssociatedIrp.SystemBuffer)
664 {
665 /* Free the IRP and fail */
666 IoFreeIrp(Irp);
667 return NULL;
668 }
669
670 /* Set flags */
671 Irp->Flags = IRP_BUFFERED_IO | IRP_DEALLOCATE_BUFFER;
672
673 /* Handle special IRP_MJ_WRITE Case */
674 if (MajorFunction == IRP_MJ_WRITE)
675 {
676 /* Copy the buffer data */
677 RtlCopyMemory(Irp->AssociatedIrp.SystemBuffer, Buffer, Length);
678 }
679 else
680 {
681 /* Set the Input Operation flag and set this as a User Buffer */
682 Irp->Flags |= IRP_INPUT_OPERATION;
683 Irp->UserBuffer = Buffer;
684 }
685 }
686 else if (DeviceObject->Flags & DO_DIRECT_IO)
687 {
688 /* Use an MDL for Direct I/O */
689 Irp->MdlAddress = IoAllocateMdl(Buffer,
690 Length,
691 FALSE,
692 FALSE,
693 NULL);
694 if (!Irp->MdlAddress)
695 {
696 /* Free the IRP and fail */
697 IoFreeIrp(Irp);
698 return NULL;
699 }
700
701 /* Probe and Lock */
702 _SEH2_TRY
703 {
704 /* Do the probe */
705 MmProbeAndLockPages(Irp->MdlAddress,
706 KernelMode,
707 MajorFunction == IRP_MJ_READ ?
708 IoWriteAccess : IoReadAccess);
709 }
710 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
711 {
712 /* Free the IRP and its MDL */
713 IoFreeMdl(Irp->MdlAddress);
714 IoFreeIrp(Irp);
715
716 /* Fail */
717 _SEH2_YIELD(return NULL);
718 }
719 _SEH2_END;
720 }
721 else
722 {
723 /* Neither, use the buffer */
724 Irp->UserBuffer = Buffer;
725 }
726
727 /* Check if this is a read */
728 if (MajorFunction == IRP_MJ_READ)
729 {
730 /* Set the parameters for a read */
731 StackPtr->Parameters.Read.Length = Length;
732 StackPtr->Parameters.Read.ByteOffset = *StartingOffset;
733 }
734 else if (MajorFunction == IRP_MJ_WRITE)
735 {
736 /* Otherwise, set write parameters */
737 StackPtr->Parameters.Write.Length = Length;
738 StackPtr->Parameters.Write.ByteOffset = *StartingOffset;
739 }
740 }
741
742 /* Set the Current Thread and IOSB */
743 Irp->UserIosb = IoStatusBlock;
744 Irp->Tail.Overlay.Thread = PsGetCurrentThread();
745
746 /* Return the IRP */
747 IOTRACE(IO_IRP_DEBUG,
748 "%s - Built IRP %p with Major, Buffer, DO %lx %p %p\n",
749 __FUNCTION__,
750 Irp,
751 MajorFunction,
752 Buffer,
753 DeviceObject);
754 return Irp;
755 }
756
757 /*
758 * @implemented
759 */
760 PIRP
761 NTAPI
762 IoBuildDeviceIoControlRequest(IN ULONG IoControlCode,
763 IN PDEVICE_OBJECT DeviceObject,
764 IN PVOID InputBuffer,
765 IN ULONG InputBufferLength,
766 IN PVOID OutputBuffer,
767 IN ULONG OutputBufferLength,
768 IN BOOLEAN InternalDeviceIoControl,
769 IN PKEVENT Event,
770 IN PIO_STATUS_BLOCK IoStatusBlock)
771 {
772 PIRP Irp;
773 PIO_STACK_LOCATION StackPtr;
774 ULONG BufferLength;
775
776 /* Allocate IRP */
777 Irp = IoAllocateIrp(DeviceObject->StackSize, FALSE);
778 if (!Irp) return NULL;
779
780 /* Get the Stack */
781 StackPtr = IoGetNextIrpStackLocation(Irp);
782
783 /* Set the DevCtl Type */
784 StackPtr->MajorFunction = InternalDeviceIoControl ?
785 IRP_MJ_INTERNAL_DEVICE_CONTROL :
786 IRP_MJ_DEVICE_CONTROL;
787
788 /* Set the IOCTL Data */
789 StackPtr->Parameters.DeviceIoControl.IoControlCode = IoControlCode;
790 StackPtr->Parameters.DeviceIoControl.InputBufferLength = InputBufferLength;
791 StackPtr->Parameters.DeviceIoControl.OutputBufferLength =
792 OutputBufferLength;
793
794 /* Handle the Methods */
795 switch (IO_METHOD_FROM_CTL_CODE(IoControlCode))
796 {
797 /* Buffered I/O */
798 case METHOD_BUFFERED:
799
800 /* Select the right Buffer Length */
801 BufferLength = InputBufferLength > OutputBufferLength ?
802 InputBufferLength : OutputBufferLength;
803
804 /* Make sure there is one */
805 if (BufferLength)
806 {
807 /* Allocate the System Buffer */
808 Irp->AssociatedIrp.SystemBuffer =
809 ExAllocatePoolWithTag(NonPagedPool,
810 BufferLength,
811 TAG_SYS_BUF);
812 if (!Irp->AssociatedIrp.SystemBuffer)
813 {
814 /* Free the IRP and fail */
815 IoFreeIrp(Irp);
816 return NULL;
817 }
818
819 /* Check if we got a buffer */
820 if (InputBuffer)
821 {
822 /* Copy into the System Buffer */
823 RtlCopyMemory(Irp->AssociatedIrp.SystemBuffer,
824 InputBuffer,
825 InputBufferLength);
826 }
827
828 /* Write the flags */
829 Irp->Flags = IRP_BUFFERED_IO | IRP_DEALLOCATE_BUFFER;
830 if (OutputBuffer) Irp->Flags |= IRP_INPUT_OPERATION;
831
832 /* Save the Buffer */
833 Irp->UserBuffer = OutputBuffer;
834 }
835 else
836 {
837 /* Clear the Flags and Buffer */
838 Irp->Flags = 0;
839 Irp->UserBuffer = NULL;
840 }
841 break;
842
843 /* Direct I/O */
844 case METHOD_IN_DIRECT:
845 case METHOD_OUT_DIRECT:
846
847 /* Check if we got an input buffer */
848 if (InputBuffer)
849 {
850 /* Allocate the System Buffer */
851 Irp->AssociatedIrp.SystemBuffer =
852 ExAllocatePoolWithTag(NonPagedPool,
853 InputBufferLength,
854 TAG_SYS_BUF);
855 if (!Irp->AssociatedIrp.SystemBuffer)
856 {
857 /* Free the IRP and fail */
858 IoFreeIrp(Irp);
859 return NULL;
860 }
861
862 /* Copy into the System Buffer */
863 RtlCopyMemory(Irp->AssociatedIrp.SystemBuffer,
864 InputBuffer,
865 InputBufferLength);
866
867 /* Write the flags */
868 Irp->Flags = IRP_BUFFERED_IO | IRP_DEALLOCATE_BUFFER;
869 }
870 else
871 {
872 /* Clear the flags */
873 Irp->Flags = 0;
874 }
875
876 /* Check if we got an output buffer */
877 if (OutputBuffer)
878 {
879 /* Allocate the System Buffer */
880 Irp->MdlAddress = IoAllocateMdl(OutputBuffer,
881 OutputBufferLength,
882 FALSE,
883 FALSE,
884 Irp);
885 if (!Irp->MdlAddress)
886 {
887 /* Free the IRP and fail */
888 IoFreeIrp(Irp);
889 return NULL;
890 }
891
892 /* Probe and Lock */
893 _SEH2_TRY
894 {
895 /* Do the probe */
896 MmProbeAndLockPages(Irp->MdlAddress,
897 KernelMode,
898 IO_METHOD_FROM_CTL_CODE(IoControlCode) ==
899 METHOD_IN_DIRECT ?
900 IoReadAccess : IoWriteAccess);
901 }
902 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
903 {
904 /* Free the MDL */
905 IoFreeMdl(Irp->MdlAddress);
906
907 /* Free the input buffer and IRP */
908 if (InputBuffer) ExFreePool(Irp->AssociatedIrp.SystemBuffer);
909 IoFreeIrp(Irp);
910
911 /* Fail */
912 _SEH2_YIELD(return NULL);
913 }
914 _SEH2_END;
915 }
916 break;
917
918 case METHOD_NEITHER:
919
920 /* Just save the Buffer */
921 Irp->UserBuffer = OutputBuffer;
922 StackPtr->Parameters.DeviceIoControl.Type3InputBuffer = InputBuffer;
923 }
924
925 /* Now write the Event and IoSB */
926 Irp->UserIosb = IoStatusBlock;
927 Irp->UserEvent = Event;
928
929 /* Sync IRPs are queued to requestor thread's irp cancel/cleanup list */
930 Irp->Tail.Overlay.Thread = PsGetCurrentThread();
931 IoQueueThreadIrp(Irp);
932
933 /* Return the IRP */
934 IOTRACE(IO_IRP_DEBUG,
935 "%s - Built IRP %p with IOCTL, Buffers, DO %lx %p %p %p\n",
936 __FUNCTION__,
937 Irp,
938 IoControlCode,
939 InputBuffer,
940 OutputBuffer,
941 DeviceObject);
942 return Irp;
943 }
944
945 /*
946 * @implemented
947 */
948 PIRP
949 NTAPI
950 IoBuildSynchronousFsdRequest(IN ULONG MajorFunction,
951 IN PDEVICE_OBJECT DeviceObject,
952 IN PVOID Buffer,
953 IN ULONG Length,
954 IN PLARGE_INTEGER StartingOffset,
955 IN PKEVENT Event,
956 IN PIO_STATUS_BLOCK IoStatusBlock)
957 {
958 PIRP Irp;
959
960 /* Do the big work to set up the IRP */
961 Irp = IoBuildAsynchronousFsdRequest(MajorFunction,
962 DeviceObject,
963 Buffer,
964 Length,
965 StartingOffset,
966 IoStatusBlock );
967 if (!Irp) return NULL;
968
969 /* Associate the caller's event object with this IRP */
970 Irp->UserEvent = Event;
971
972 /* Set the synchronous flag */
973 Irp->Flags |= IRP_SYNCHRONOUS_API;
974
975 /* Sync IRPs are queued to requestor thread's irp cancel/cleanup list */
976 IoQueueThreadIrp(Irp);
977 return Irp;
978 }
979
980 /*
981 * @implemented
982 */
983 BOOLEAN
984 NTAPI
985 IoCancelIrp(IN PIRP Irp)
986 {
987 KIRQL OldIrql;
988 KIRQL IrqlAtEntry;
989 PDRIVER_CANCEL CancelRoutine;
990 IOTRACE(IO_IRP_DEBUG,
991 "%s - Canceling IRP %p\n",
992 __FUNCTION__,
993 Irp);
994 ASSERT(Irp->Type == IO_TYPE_IRP);
995 IrqlAtEntry = KeGetCurrentIrql();
996
997 /* Acquire the cancel lock and cancel the IRP */
998 IoAcquireCancelSpinLock(&OldIrql);
999 Irp->Cancel = TRUE;
1000
1001 /* Clear the cancel routine and get the old one */
1002 CancelRoutine = (PVOID)IoSetCancelRoutine(Irp, NULL);
1003 if (CancelRoutine)
1004 {
1005 /* We had a routine, make sure the IRP isn't completed */
1006 if (Irp->CurrentLocation > (Irp->StackCount + 1))
1007 {
1008 /* It is, bugcheck */
1009 KeBugCheckEx(CANCEL_STATE_IN_COMPLETED_IRP,
1010 (ULONG_PTR)Irp,
1011 0,
1012 0,
1013 0);
1014 }
1015
1016 /* Set the cancel IRQL And call the routine */
1017 Irp->CancelIrql = OldIrql;
1018 CancelRoutine(IoGetCurrentIrpStackLocation(Irp)->DeviceObject, Irp);
1019 ASSERT(IrqlAtEntry == KeGetCurrentIrql());
1020 return TRUE;
1021 }
1022
1023 /* Otherwise, release the cancel lock and fail */
1024 IoReleaseCancelSpinLock(OldIrql);
1025 return FALSE;
1026 }
1027
1028 /*
1029 * @implemented
1030 */
1031 VOID
1032 NTAPI
1033 IoCancelThreadIo(IN PETHREAD Thread)
1034 {
1035 KIRQL OldIrql;
1036 ULONG Retries = 3000;
1037 LARGE_INTEGER Interval;
1038 PLIST_ENTRY ListHead, NextEntry;
1039 PIRP Irp;
1040 IOTRACE(IO_IRP_DEBUG,
1041 "%s - Canceling IRPs for Thread %p\n",
1042 __FUNCTION__,
1043 Thread);
1044
1045 /* Raise to APC to protect the IrpList */
1046 KeRaiseIrql(APC_LEVEL, &OldIrql);
1047
1048 /* Start by cancelling all the IRPs in the current thread queue. */
1049 ListHead = &Thread->IrpList;
1050 NextEntry = ListHead->Flink;
1051 while (ListHead != NextEntry)
1052 {
1053 /* Get the IRP */
1054 Irp = CONTAINING_RECORD(NextEntry, IRP, ThreadListEntry);
1055
1056 /* Cancel it */
1057 IoCancelIrp(Irp);
1058
1059 /* Move to the next entry */
1060 NextEntry = NextEntry->Flink;
1061 }
1062
1063 /* Wait 100 milliseconds */
1064 Interval.QuadPart = -1000000;
1065
1066 /* Wait till all the IRPs are completed or cancelled. */
1067 while (!IsListEmpty(&Thread->IrpList))
1068 {
1069 /* Now we can lower */
1070 KeLowerIrql(OldIrql);
1071
1072 /* Wait a short while and then look if all our IRPs were completed. */
1073 KeDelayExecutionThread(KernelMode, FALSE, &Interval);
1074
1075 /*
1076 * Don't stay here forever if some broken driver doesn't complete
1077 * the IRP.
1078 */
1079 if (!(Retries--))
1080 {
1081 /* Print out a message and remove the IRP */
1082 DPRINT1("Broken driver did not complete!\n");
1083 IopRemoveThreadIrp();
1084 }
1085
1086 /* Raise the IRQL Again */
1087 KeRaiseIrql(APC_LEVEL, &OldIrql);
1088 }
1089
1090 /* We're done, lower the IRQL */
1091 KeLowerIrql(OldIrql);
1092 }
1093
1094 /*
1095 * @implemented
1096 */
1097 NTSTATUS
1098 NTAPI
1099 IoCallDriver(IN PDEVICE_OBJECT DeviceObject,
1100 IN PIRP Irp)
1101 {
1102 /* Call fastcall */
1103 return IofCallDriver(DeviceObject, Irp);
1104 }
1105
1106 /*
1107 * @implemented
1108 */
1109 VOID
1110 NTAPI
1111 IoCompleteRequest(IN PIRP Irp,
1112 IN CCHAR PriorityBoost)
1113 {
1114 /* Call the fastcall */
1115 IofCompleteRequest(Irp, PriorityBoost);
1116 }
1117
1118 /*
1119 * @implemented
1120 */
1121 VOID
1122 NTAPI
1123 IoEnqueueIrp(IN PIRP Irp)
1124 {
1125 /* This is the same as calling IoQueueThreadIrp */
1126 IoQueueThreadIrp(Irp);
1127 }
1128
1129 /*
1130 * @implemented
1131 */
1132 NTSTATUS
1133 FASTCALL
1134 IofCallDriver(IN PDEVICE_OBJECT DeviceObject,
1135 IN PIRP Irp)
1136 {
1137 PDRIVER_OBJECT DriverObject;
1138 PIO_STACK_LOCATION StackPtr;
1139
1140 /* Make sure this is a valid IRP */
1141 ASSERT(Irp->Type == IO_TYPE_IRP);
1142
1143 /* Get the Driver Object */
1144 DriverObject = DeviceObject->DriverObject;
1145
1146 /* Decrease the current location and check if */
1147 Irp->CurrentLocation--;
1148 if (Irp->CurrentLocation <= 0)
1149 {
1150 /* This IRP ran out of stack, bugcheck */
1151 KeBugCheckEx(NO_MORE_IRP_STACK_LOCATIONS, (ULONG_PTR)Irp, 0, 0, 0);
1152 }
1153
1154 /* Now update the stack location */
1155 StackPtr = IoGetNextIrpStackLocation(Irp);
1156 Irp->Tail.Overlay.CurrentStackLocation = StackPtr;
1157
1158 /* Get the Device Object */
1159 StackPtr->DeviceObject = DeviceObject;
1160
1161 /* Call it */
1162 return DriverObject->MajorFunction[StackPtr->MajorFunction](DeviceObject,
1163 Irp);
1164 }
1165
1166 FORCEINLINE
1167 VOID
1168 IopClearStackLocation(IN PIO_STACK_LOCATION IoStackLocation)
1169 {
1170 IoStackLocation->MinorFunction = 0;
1171 IoStackLocation->Flags = 0;
1172 IoStackLocation->Control &= SL_ERROR_RETURNED;
1173 IoStackLocation->Parameters.Others.Argument1 = 0;
1174 IoStackLocation->Parameters.Others.Argument2 = 0;
1175 IoStackLocation->Parameters.Others.Argument3 = 0;
1176 IoStackLocation->FileObject = NULL;
1177 }
1178
1179 /*
1180 * @implemented
1181 */
1182 VOID
1183 FASTCALL
1184 IofCompleteRequest(IN PIRP Irp,
1185 IN CCHAR PriorityBoost)
1186 {
1187 PIO_STACK_LOCATION StackPtr, LastStackPtr;
1188 PDEVICE_OBJECT DeviceObject;
1189 PFILE_OBJECT FileObject;
1190 PETHREAD Thread;
1191 NTSTATUS Status;
1192 PMDL Mdl, NextMdl;
1193 ULONG MasterCount;
1194 PIRP MasterIrp;
1195 ULONG Flags;
1196 NTSTATUS ErrorCode = STATUS_SUCCESS;
1197 IOTRACE(IO_IRP_DEBUG,
1198 "%s - Completing IRP %p\n",
1199 __FUNCTION__,
1200 Irp);
1201
1202 /* Make sure this IRP isn't getting completed twice or is invalid */
1203 if ((Irp->CurrentLocation) > (Irp->StackCount + 1))
1204 {
1205 /* Bugcheck */
1206 KeBugCheckEx(MULTIPLE_IRP_COMPLETE_REQUESTS, (ULONG_PTR)Irp, 0, 0, 0);
1207 }
1208
1209 /* Some sanity checks */
1210 ASSERT(Irp->Type == IO_TYPE_IRP);
1211 ASSERT(!Irp->CancelRoutine);
1212 ASSERT(Irp->IoStatus.Status != STATUS_PENDING);
1213 ASSERT(Irp->IoStatus.Status != (NTSTATUS)0xFFFFFFFF);
1214
1215 /* Get the last stack */
1216 LastStackPtr = (PIO_STACK_LOCATION)(Irp + 1);
1217 if (LastStackPtr->Control & SL_ERROR_RETURNED)
1218 {
1219 /* Get the error code */
1220 ErrorCode = PtrToUlong(LastStackPtr->Parameters.Others.Argument4);
1221 }
1222
1223 /* Get the Current Stack */
1224 StackPtr = IoGetCurrentIrpStackLocation(Irp);
1225
1226 /* Loop the Stacks and complete the IRPs */
1227 do
1228 {
1229 /* Skip current stack location */
1230 IoSkipCurrentIrpStackLocation(Irp);
1231
1232 /* Set Pending Returned */
1233 Irp->PendingReturned = StackPtr->Control & SL_PENDING_RETURNED;
1234
1235 /* Check if we failed */
1236 if (!NT_SUCCESS(Irp->IoStatus.Status))
1237 {
1238 /* Check if it was changed by a completion routine */
1239 if (Irp->IoStatus.Status != ErrorCode)
1240 {
1241 /* Update the error for the current stack */
1242 ErrorCode = Irp->IoStatus.Status;
1243 StackPtr->Control |= SL_ERROR_RETURNED;
1244 LastStackPtr->Parameters.Others.Argument4 = UlongToPtr(ErrorCode);
1245 LastStackPtr->Control |= SL_ERROR_RETURNED;
1246 }
1247 }
1248
1249 /* Check if there is a Completion Routine to Call */
1250 if ((NT_SUCCESS(Irp->IoStatus.Status) &&
1251 (StackPtr->Control & SL_INVOKE_ON_SUCCESS)) ||
1252 (!NT_SUCCESS(Irp->IoStatus.Status) &&
1253 (StackPtr->Control & SL_INVOKE_ON_ERROR)) ||
1254 (Irp->Cancel &&
1255 (StackPtr->Control & SL_INVOKE_ON_CANCEL)))
1256 {
1257 /* Clear the stack location */
1258 IopClearStackLocation(StackPtr);
1259
1260 /* Check for highest-level device completion routines */
1261 if (Irp->CurrentLocation == (Irp->StackCount + 1))
1262 {
1263 /* Clear the DO, since the current stack location is invalid */
1264 DeviceObject = NULL;
1265 }
1266 else
1267 {
1268 /* Otherwise, return the real one */
1269 DeviceObject = IoGetCurrentIrpStackLocation(Irp)->DeviceObject;
1270 }
1271
1272 /* Call the completion routine */
1273 Status = StackPtr->CompletionRoutine(DeviceObject,
1274 Irp,
1275 StackPtr->Context);
1276
1277 /* Don't touch the Packet in this case, since it might be gone! */
1278 if (Status == STATUS_MORE_PROCESSING_REQUIRED) return;
1279 }
1280 else
1281 {
1282 /* Otherwise, check if this is a completed IRP */
1283 if ((Irp->CurrentLocation <= Irp->StackCount) &&
1284 (Irp->PendingReturned))
1285 {
1286 /* Mark it as pending */
1287 IoMarkIrpPending(Irp);
1288 }
1289
1290 /* Clear the stack location */
1291 IopClearStackLocation(StackPtr);
1292 }
1293
1294 /* Move pointer to next stack location */
1295 StackPtr++;
1296 } while (Irp->CurrentLocation <= Irp->StackCount);
1297
1298 /* Check if the IRP is an associated IRP */
1299 if (Irp->Flags & IRP_ASSOCIATED_IRP)
1300 {
1301 /* Get the master IRP and count */
1302 MasterIrp = Irp->AssociatedIrp.MasterIrp;
1303 MasterCount = InterlockedDecrement(&MasterIrp->AssociatedIrp.IrpCount);
1304
1305 /* Free the MDLs */
1306 for (Mdl = Irp->MdlAddress; Mdl; Mdl = NextMdl)
1307 {
1308 /* Go to the next one */
1309 NextMdl = Mdl->Next;
1310 IoFreeMdl(Mdl);
1311 }
1312
1313 /* Free the IRP itself */
1314 IoFreeIrp(Irp);
1315
1316 /* Complete the Master IRP */
1317 if (!MasterCount) IofCompleteRequest(MasterIrp, PriorityBoost);
1318 return;
1319 }
1320
1321 /* We don't support this yet */
1322 ASSERT(Irp->IoStatus.Status != STATUS_REPARSE);
1323
1324 /* Check if we have an auxiliary buffer */
1325 if (Irp->Tail.Overlay.AuxiliaryBuffer)
1326 {
1327 /* Free it */
1328 ExFreePool(Irp->Tail.Overlay.AuxiliaryBuffer);
1329 Irp->Tail.Overlay.AuxiliaryBuffer = NULL;
1330 }
1331
1332 /* Check if this is a Paging I/O or Close Operation */
1333 if (Irp->Flags & (IRP_PAGING_IO | IRP_CLOSE_OPERATION))
1334 {
1335 /* Handle a Close Operation or Sync Paging I/O */
1336 if (Irp->Flags & (IRP_SYNCHRONOUS_PAGING_IO | IRP_CLOSE_OPERATION))
1337 {
1338 /* Set the I/O Status and Signal the Event */
1339 Flags = Irp->Flags & (IRP_SYNCHRONOUS_PAGING_IO | IRP_PAGING_IO);
1340 *Irp->UserIosb = Irp->IoStatus;
1341 KeSetEvent(Irp->UserEvent, PriorityBoost, FALSE);
1342
1343 /* Free the IRP for a Paging I/O Only, Close is handled by us */
1344 if (Flags) IoFreeIrp(Irp);
1345 }
1346 else
1347 {
1348 #if 0
1349 /* Page 166 */
1350 KeInitializeApc(&Irp->Tail.Apc
1351 &Irp->Tail.Overlay.Thread->Tcb,
1352 Irp->ApcEnvironment,
1353 IopCompletePageWrite,
1354 NULL,
1355 NULL,
1356 KernelMode,
1357 NULL);
1358 KeInsertQueueApc(&Irp->Tail.Apc,
1359 NULL,
1360 NULL,
1361 PriorityBoost);
1362 #else
1363 /* Not implemented yet. */
1364 DPRINT1("Not supported!\n");
1365 while (TRUE);
1366 #endif
1367 }
1368
1369 /* Get out of here */
1370 return;
1371 }
1372
1373 /* Unlock MDL Pages, page 167. */
1374 Mdl = Irp->MdlAddress;
1375 while (Mdl)
1376 {
1377 MmUnlockPages(Mdl);
1378 Mdl = Mdl->Next;
1379 }
1380
1381 /* Check if we should exit because of a Deferred I/O (page 168) */
1382 if ((Irp->Flags & IRP_DEFER_IO_COMPLETION) && !(Irp->PendingReturned))
1383 {
1384 /*
1385 * Return without queuing the completion APC, since the caller will
1386 * take care of doing its own optimized completion at PASSIVE_LEVEL.
1387 */
1388 return;
1389 }
1390
1391 /* Get the thread and file object */
1392 Thread = Irp->Tail.Overlay.Thread;
1393 FileObject = Irp->Tail.Overlay.OriginalFileObject;
1394
1395 /* Make sure the IRP isn't canceled */
1396 if (!Irp->Cancel)
1397 {
1398 /* Initialize the APC */
1399 KeInitializeApc(&Irp->Tail.Apc,
1400 &Thread->Tcb,
1401 Irp->ApcEnvironment,
1402 IopCompleteRequest,
1403 NULL,
1404 NULL,
1405 KernelMode,
1406 NULL);
1407
1408 /* Queue it */
1409 KeInsertQueueApc(&Irp->Tail.Apc,
1410 FileObject,
1411 NULL, /* This is used for REPARSE stuff */
1412 PriorityBoost);
1413 }
1414 else
1415 {
1416 /* The IRP just got canceled... does a thread still own it? */
1417 Thread = Irp->Tail.Overlay.Thread;
1418 if (Thread)
1419 {
1420 /* Yes! There is still hope! Initialize the APC */
1421 KeInitializeApc(&Irp->Tail.Apc,
1422 &Thread->Tcb,
1423 Irp->ApcEnvironment,
1424 IopCompleteRequest,
1425 NULL,
1426 NULL,
1427 KernelMode,
1428 NULL);
1429
1430 /* Queue it */
1431 KeInsertQueueApc(&Irp->Tail.Apc,
1432 FileObject,
1433 NULL, /* This is used for REPARSE stuff */
1434 PriorityBoost);
1435 }
1436 else
1437 {
1438 /* Nothing left for us to do, kill it */
1439 ASSERT(Irp->Cancel);
1440 IopCleanupIrp(Irp, FileObject);
1441 }
1442 }
1443 }
1444
1445 NTSTATUS
1446 NTAPI
1447 IopSynchronousCompletion(IN PDEVICE_OBJECT DeviceObject,
1448 IN PIRP Irp,
1449 IN PVOID Context)
1450 {
1451 if (Irp->PendingReturned)
1452 KeSetEvent((PKEVENT)Context, IO_NO_INCREMENT, FALSE);
1453 return STATUS_MORE_PROCESSING_REQUIRED;
1454 }
1455
1456 /*
1457 * @implemented
1458 */
1459 BOOLEAN
1460 NTAPI
1461 IoForwardIrpSynchronously(IN PDEVICE_OBJECT DeviceObject,
1462 IN PIRP Irp)
1463 {
1464 KEVENT Event;
1465 NTSTATUS Status;
1466
1467 /* Check if next stack location is available */
1468 if (Irp->CurrentLocation < Irp->StackCount)
1469 {
1470 /* No more stack location */
1471 return FALSE;
1472 }
1473
1474 /* Initialize event */
1475 KeInitializeEvent(&Event, NotificationEvent, FALSE);
1476
1477 /* Copy stack location for next driver */
1478 IoCopyCurrentIrpStackLocationToNext(Irp);
1479
1480 /* Set a completion routine, which will signal the event */
1481 IoSetCompletionRoutine(Irp, IopSynchronousCompletion, &Event, TRUE, TRUE, TRUE);
1482
1483 /* Call next driver */
1484 Status = IoCallDriver(DeviceObject, Irp);
1485
1486 /* Check if irp is pending */
1487 if (Status == STATUS_PENDING)
1488 {
1489 /* Yes, wait for its completion */
1490 KeWaitForSingleObject(&Event, Suspended, KernelMode, FALSE, NULL);
1491 }
1492
1493 /* Return success */
1494 return TRUE;
1495 }
1496
1497 /*
1498 * @implemented
1499 */
1500 VOID
1501 NTAPI
1502 IoFreeIrp(IN PIRP Irp)
1503 {
1504 PNPAGED_LOOKASIDE_LIST List;
1505 PP_NPAGED_LOOKASIDE_NUMBER ListType = LookasideSmallIrpList;
1506 PKPRCB Prcb;
1507 IOTRACE(IO_IRP_DEBUG,
1508 "%s - Freeing IRPs %p\n",
1509 __FUNCTION__,
1510 Irp);
1511
1512 /* Make sure the Thread IRP list is empty and that it OK to free it */
1513 ASSERT(Irp->Type == IO_TYPE_IRP);
1514 ASSERT(IsListEmpty(&Irp->ThreadListEntry));
1515 ASSERT(Irp->CurrentLocation >= Irp->StackCount);
1516
1517 /* If this was a pool alloc, free it with the pool */
1518 if (!(Irp->AllocationFlags & IRP_ALLOCATED_FIXED_SIZE))
1519 {
1520 /* Free it */
1521 ExFreePoolWithTag(Irp, TAG_IRP);
1522 }
1523 else
1524 {
1525 /* Check if this was a Big IRP */
1526 if (Irp->StackCount != 1) ListType = LookasideLargeIrpList;
1527
1528 /* Get the PRCB */
1529 Prcb = KeGetCurrentPrcb();
1530
1531 /* Use the P List */
1532 List = (PNPAGED_LOOKASIDE_LIST)Prcb->PPLookasideList[ListType].P;
1533 List->L.TotalFrees++;
1534
1535 /* Check if the Free was within the Depth or not */
1536 if (ExQueryDepthSList(&List->L.ListHead) >= List->L.Depth)
1537 {
1538 /* Let the balancer know */
1539 List->L.FreeMisses++;
1540
1541 /* Use the L List */
1542 List = (PNPAGED_LOOKASIDE_LIST)Prcb->PPLookasideList[ListType].L;
1543 List->L.TotalFrees++;
1544
1545 /* Check if the Free was within the Depth or not */
1546 if (ExQueryDepthSList(&List->L.ListHead) >= List->L.Depth)
1547 {
1548 /* All lists failed, use the pool */
1549 List->L.FreeMisses++;
1550 ExFreePoolWithTag(Irp, TAG_IRP);
1551 Irp = NULL;
1552 }
1553 }
1554
1555 /* The free was within the Depth */
1556 if (Irp)
1557 {
1558 InterlockedPushEntrySList(&List->L.ListHead,
1559 (PSINGLE_LIST_ENTRY)Irp);
1560 }
1561 }
1562 }
1563
1564 /*
1565 * @implemented
1566 */
1567 IO_PAGING_PRIORITY
1568 FASTCALL
1569 IoGetPagingIoPriority(IN PIRP Irp)
1570 {
1571 IO_PAGING_PRIORITY Priority;
1572 ULONG Flags;
1573
1574 /* Get the flags */
1575 Flags = Irp->Flags;
1576
1577 /* Check what priority it has */
1578 if (Flags & 0x8000) // FIXME: Undocumented flag
1579 {
1580 /* High priority */
1581 Priority = IoPagingPriorityHigh;
1582 }
1583 else if (Flags & IRP_PAGING_IO)
1584 {
1585 /* Normal priority */
1586 Priority = IoPagingPriorityNormal;
1587 }
1588 else
1589 {
1590 /* Invalid -- not a paging IRP */
1591 Priority = IoPagingPriorityInvalid;
1592 }
1593
1594 /* Return the priority */
1595 return Priority;
1596 }
1597
1598 /*
1599 * @implemented
1600 */
1601 PEPROCESS
1602 NTAPI
1603 IoGetRequestorProcess(IN PIRP Irp)
1604 {
1605 /* Return the requestor process */
1606 return Irp->Tail.Overlay.Thread->ThreadsProcess;
1607 }
1608
1609 /*
1610 * @implemented
1611 */
1612 ULONG
1613 NTAPI
1614 IoGetRequestorProcessId(IN PIRP Irp)
1615 {
1616 /* Return the requestor process' id */
1617 return PtrToUlong(IoGetRequestorProcess(Irp)->UniqueProcessId);
1618 }
1619
1620 /*
1621 * @implemented
1622 */
1623 NTSTATUS
1624 NTAPI
1625 IoGetRequestorSessionId(IN PIRP Irp,
1626 OUT PULONG pSessionId)
1627 {
1628 /* Return the session */
1629 *pSessionId = IoGetRequestorProcess(Irp)->Session;
1630 return STATUS_SUCCESS;
1631 }
1632
1633 /*
1634 * @implemented
1635 */
1636 PIRP
1637 NTAPI
1638 IoGetTopLevelIrp(VOID)
1639 {
1640 /* Return the IRP */
1641 return (PIRP)PsGetCurrentThread()->TopLevelIrp;
1642 }
1643
1644 /*
1645 * @implemented
1646 */
1647 VOID
1648 NTAPI
1649 IoInitializeIrp(IN PIRP Irp,
1650 IN USHORT PacketSize,
1651 IN CCHAR StackSize)
1652 {
1653 /* Clear it */
1654 IOTRACE(IO_IRP_DEBUG,
1655 "%s - Initializing IRP %p\n",
1656 __FUNCTION__,
1657 Irp);
1658 RtlZeroMemory(Irp, PacketSize);
1659
1660 /* Set the Header and other data */
1661 Irp->Type = IO_TYPE_IRP;
1662 Irp->Size = PacketSize;
1663 Irp->StackCount = StackSize;
1664 Irp->CurrentLocation = StackSize + 1;
1665 Irp->ApcEnvironment = KeGetCurrentThread()->ApcStateIndex;
1666 Irp->Tail.Overlay.CurrentStackLocation = (PIO_STACK_LOCATION)(Irp + 1) + StackSize;
1667
1668 /* Initialize the Thread List */
1669 InitializeListHead(&Irp->ThreadListEntry);
1670 }
1671
1672 /*
1673 * @implemented
1674 */
1675 BOOLEAN
1676 NTAPI
1677 IoIsOperationSynchronous(IN PIRP Irp)
1678 {
1679 /* Check the flags */
1680 if (!(Irp->Flags & (IRP_PAGING_IO | IRP_SYNCHRONOUS_PAGING_IO)) &&
1681 ((Irp->Flags & IRP_SYNCHRONOUS_PAGING_IO) ||
1682 (Irp->Flags & IRP_SYNCHRONOUS_API) ||
1683 (IoGetCurrentIrpStackLocation(Irp)->FileObject->Flags &
1684 FO_SYNCHRONOUS_IO)))
1685 {
1686 /* Synch API or Paging I/O is OK, as is Sync File I/O */
1687 return TRUE;
1688 }
1689
1690 /* Otherwise, it is an asynchronous operation. */
1691 return FALSE;
1692 }
1693
1694 /*
1695 * @unimplemented
1696 */
1697 BOOLEAN
1698 NTAPI
1699 IoIsValidNameGraftingBuffer(IN PIRP Irp,
1700 IN PREPARSE_DATA_BUFFER ReparseBuffer)
1701 {
1702 UNIMPLEMENTED;
1703 return FALSE;
1704 }
1705
1706 /*
1707 * @implemented
1708 */
1709 PIRP
1710 NTAPI
1711 IoMakeAssociatedIrp(IN PIRP Irp,
1712 IN CCHAR StackSize)
1713 {
1714 PIRP AssocIrp;
1715 IOTRACE(IO_IRP_DEBUG,
1716 "%s - Associating IRP %p\n",
1717 __FUNCTION__,
1718 Irp);
1719
1720 /* Allocate the IRP */
1721 AssocIrp = IoAllocateIrp(StackSize, FALSE);
1722 if (!AssocIrp) return NULL;
1723
1724 /* Set the Flags */
1725 AssocIrp->Flags |= IRP_ASSOCIATED_IRP;
1726
1727 /* Set the Thread */
1728 AssocIrp->Tail.Overlay.Thread = Irp->Tail.Overlay.Thread;
1729
1730 /* Associate them */
1731 AssocIrp->AssociatedIrp.MasterIrp = Irp;
1732 return AssocIrp;
1733 }
1734
1735 /*
1736 * @implemented
1737 */
1738 VOID
1739 NTAPI
1740 IoQueueThreadIrp(IN PIRP Irp)
1741 {
1742 IOTRACE(IO_IRP_DEBUG,
1743 "%s - Queueing IRP %p\n",
1744 __FUNCTION__,
1745 Irp);
1746
1747 /* Use our inlined routine */
1748 IopQueueIrpToThread(Irp);
1749 }
1750
1751 /*
1752 * @implemented
1753 * Reference: Chris Cant's "Writing WDM Device Drivers"
1754 */
1755 VOID
1756 NTAPI
1757 IoReuseIrp(IN OUT PIRP Irp,
1758 IN NTSTATUS Status)
1759 {
1760 UCHAR AllocationFlags;
1761 IOTRACE(IO_IRP_DEBUG,
1762 "%s - Reusing IRP %p\n",
1763 __FUNCTION__,
1764 Irp);
1765
1766 /* Make sure it's OK to reuse it */
1767 ASSERT(!Irp->CancelRoutine);
1768 ASSERT(IsListEmpty(&Irp->ThreadListEntry));
1769
1770 /* Get the old flags */
1771 AllocationFlags = Irp->AllocationFlags;
1772
1773 /* Reinitialize the IRP */
1774 IoInitializeIrp(Irp, Irp->Size, Irp->StackCount);
1775
1776 /* Duplicate the data */
1777 Irp->IoStatus.Status = Status;
1778 Irp->AllocationFlags = AllocationFlags;
1779 }
1780
1781 /*
1782 * @implemented
1783 */
1784 VOID
1785 NTAPI
1786 IoSetTopLevelIrp(IN PIRP Irp)
1787 {
1788 /* Set the IRP */
1789 PsGetCurrentThread()->TopLevelIrp = (ULONG_PTR)Irp;
1790 }