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     /* Set the Event which makes it Syncronous */
 970     Irp->UserEvent = Event;
 971
 972     /* Sync IRPs are queued to requestor thread's irp cancel/cleanup list */
 973     IoQueueThreadIrp(Irp);
 974     return Irp;
 975 }
 976
 977 /*
 978  * @implemented
 979  */
 980 BOOLEAN
 981 NTAPI
 982 IoCancelIrp(IN PIRP Irp)
 983 {
 984     KIRQL OldIrql;
 985     KIRQL IrqlAtEntry;
 986     PDRIVER_CANCEL CancelRoutine;
 987     IOTRACE(IO_IRP_DEBUG,
 988             "%s - Canceling IRP %p\n",
 989             __FUNCTION__,
 990             Irp);
 991     ASSERT(Irp->Type == IO_TYPE_IRP);
 992     IrqlAtEntry = KeGetCurrentIrql();
 993
 994     /* Acquire the cancel lock and cancel the IRP */
 995     IoAcquireCancelSpinLock(&OldIrql);
 996     Irp->Cancel = TRUE;
 997
 998     /* Clear the cancel routine and get the old one */
 999     CancelRoutine = (PVOID)IoSetCancelRoutine(Irp, NULL);
1000     if (CancelRoutine)
1001     {
1002         /* We had a routine, make sure the IRP isn't completed */
1003         if (Irp->CurrentLocation > (Irp->StackCount + 1))
1004         {
1005             /* It is, bugcheck */
1006             KeBugCheckEx(CANCEL_STATE_IN_COMPLETED_IRP,
1007                          (ULONG_PTR)Irp,
1008                          0,
1009                          0,
1010                          0);
1011         }
1012
1013         /* Set the cancel IRQL And call the routine */
1014         Irp->CancelIrql = OldIrql;
1015         CancelRoutine(IoGetCurrentIrpStackLocation(Irp)->DeviceObject, Irp);
1016         ASSERT(IrqlAtEntry == KeGetCurrentIrql());
1017         return TRUE;
1018     }
1019
1020     /* Otherwise, release the cancel lock and fail */
1021     IoReleaseCancelSpinLock(OldIrql);
1022     return FALSE;
1023 }
1024
1025 /*
1026  * @implemented
1027  */
1028 VOID
1029 NTAPI
1030 IoCancelThreadIo(IN PETHREAD Thread)
1031 {
1032     KIRQL OldIrql;
1033     ULONG Retries = 3000;
1034     LARGE_INTEGER Interval;
1035     PLIST_ENTRY ListHead, NextEntry;
1036     PIRP Irp;
1037     IOTRACE(IO_IRP_DEBUG,
1038             "%s - Canceling IRPs for Thread %p\n",
1039             __FUNCTION__,
1040             Thread);
1041
1042     /* Raise to APC to protect the IrpList */
1043     KeRaiseIrql(APC_LEVEL, &OldIrql);
1044
1045     /* Start by cancelling all the IRPs in the current thread queue. */
1046     ListHead = &Thread->IrpList;
1047     NextEntry = ListHead->Flink;
1048     while (ListHead != NextEntry)
1049     {
1050         /* Get the IRP */
1051         Irp = CONTAINING_RECORD(NextEntry, IRP, ThreadListEntry);
1052
1053         /* Cancel it */
1054         IoCancelIrp(Irp);
1055
1056         /* Move to the next entry */
1057         NextEntry = NextEntry->Flink;
1058     }
1059
1060      /* Wait 100 milliseconds */
1061     Interval.QuadPart = -1000000;
1062
1063     /* Wait till all the IRPs are completed or cancelled. */
1064     while (!IsListEmpty(&Thread->IrpList))
1065     {
1066         /* Now we can lower */
1067         KeLowerIrql(OldIrql);
1068
1069         /* Wait a short while and then look if all our IRPs were completed. */
1070         KeDelayExecutionThread(KernelMode, FALSE, &Interval);
1071
1072         /*
1073          * Don't stay here forever if some broken driver doesn't complete
1074          * the IRP.
1075          */
1076         if (!(Retries--))
1077         {
1078             /* Print out a message and remove the IRP */
1079             DPRINT1("Broken driver did not complete!\n");
1080             IopRemoveThreadIrp();
1081         }
1082
1083         /* Raise the IRQL Again */
1084         KeRaiseIrql(APC_LEVEL, &OldIrql);
1085     }
1086
1087     /* We're done, lower the IRQL */
1088     KeLowerIrql(OldIrql);
1089 }
1090
1091 /*
1092  * @implemented
1093  */
1094 NTSTATUS
1095 NTAPI
1096 IoCallDriver(IN PDEVICE_OBJECT DeviceObject,
1097              IN PIRP Irp)
1098 {
1099     /* Call fastcall */
1100     return IofCallDriver(DeviceObject, Irp);
1101 }
1102
1103 /*
1104  * @implemented
1105  */
1106 VOID
1107 NTAPI
1108 IoCompleteRequest(IN PIRP Irp,
1109                   IN CCHAR PriorityBoost)
1110 {
1111     /* Call the fastcall */
1112     IofCompleteRequest(Irp, PriorityBoost);
1113 }
1114
1115 /*
1116  * @implemented
1117  */
1118 VOID
1119 NTAPI
1120 IoEnqueueIrp(IN PIRP Irp)
1121 {
1122     /* This is the same as calling IoQueueThreadIrp */
1123     IoQueueThreadIrp(Irp);
1124 }
1125
1126 /*
1127  * @implemented
1128  */
1129 NTSTATUS
1130 FASTCALL
1131 IofCallDriver(IN PDEVICE_OBJECT DeviceObject,
1132               IN PIRP Irp)
1133 {
1134     PDRIVER_OBJECT DriverObject;
1135     PIO_STACK_LOCATION StackPtr;
1136
1137     /* Make sure this is a valid IRP */
1138     ASSERT(Irp->Type == IO_TYPE_IRP);
1139
1140     /* Get the Driver Object */
1141     DriverObject = DeviceObject->DriverObject;
1142
1143     /* Decrease the current location and check if */
1144     Irp->CurrentLocation--;
1145     if (Irp->CurrentLocation <= 0)
1146     {
1147         /* This IRP ran out of stack, bugcheck */
1148         KeBugCheckEx(NO_MORE_IRP_STACK_LOCATIONS, (ULONG_PTR)Irp, 0, 0, 0);
1149     }
1150
1151     /* Now update the stack location */
1152     StackPtr = IoGetNextIrpStackLocation(Irp);
1153     Irp->Tail.Overlay.CurrentStackLocation = StackPtr;
1154
1155     /* Get the Device Object */
1156     StackPtr->DeviceObject = DeviceObject;
1157
1158     /* Call it */
1159     return DriverObject->MajorFunction[StackPtr->MajorFunction](DeviceObject,
1160                                                                 Irp);
1161 }
1162
1163 FORCEINLINE
1164 VOID
1165 IopClearStackLocation(IN PIO_STACK_LOCATION IoStackLocation)
1166 {
1167     IoStackLocation->MinorFunction = 0;
1168     IoStackLocation->Flags = 0;
1169     IoStackLocation->Control &= SL_ERROR_RETURNED;
1170     IoStackLocation->Parameters.Others.Argument1 = 0;
1171     IoStackLocation->Parameters.Others.Argument2 = 0;
1172     IoStackLocation->Parameters.Others.Argument3 = 0;
1173     IoStackLocation->FileObject = NULL;
1174 }
1175
1176 /*
1177  * @implemented
1178  */
1179 VOID
1180 FASTCALL
1181 IofCompleteRequest(IN PIRP Irp,
1182                    IN CCHAR PriorityBoost)
1183 {
1184     PIO_STACK_LOCATION StackPtr, LastStackPtr;
1185     PDEVICE_OBJECT DeviceObject;
1186     PFILE_OBJECT FileObject;
1187     PETHREAD Thread;
1188     NTSTATUS Status;
1189     PMDL Mdl, NextMdl;
1190     ULONG MasterCount;
1191     PIRP MasterIrp;
1192     ULONG Flags;
1193     NTSTATUS ErrorCode = STATUS_SUCCESS;
1194     IOTRACE(IO_IRP_DEBUG,
1195             "%s - Completing IRP %p\n",
1196             __FUNCTION__,
1197             Irp);
1198
1199     /* Make sure this IRP isn't getting completed twice or is invalid */
1200     if ((Irp->CurrentLocation) > (Irp->StackCount + 1))
1201     {
1202         /* Bugcheck */
1203         KeBugCheckEx(MULTIPLE_IRP_COMPLETE_REQUESTS, (ULONG_PTR)Irp, 0, 0, 0);
1204     }
1205
1206     /* Some sanity checks */
1207     ASSERT(Irp->Type == IO_TYPE_IRP);
1208     ASSERT(!Irp->CancelRoutine);
1209     ASSERT(Irp->IoStatus.Status != STATUS_PENDING);
1210     ASSERT(Irp->IoStatus.Status != (NTSTATUS)0xFFFFFFFF);
1211
1212     /* Get the last stack */
1213     LastStackPtr = (PIO_STACK_LOCATION)(Irp + 1);
1214     if (LastStackPtr->Control & SL_ERROR_RETURNED)
1215     {
1216         /* Get the error code */
1217         ErrorCode = PtrToUlong(LastStackPtr->Parameters.Others.Argument4);
1218     }
1219
1220     /* Get the Current Stack */
1221     StackPtr = IoGetCurrentIrpStackLocation(Irp);
1222
1223     /* Loop the Stacks and complete the IRPs */
1224     do
1225     {
1226         /* Skip current stack location */
1227         IoSkipCurrentIrpStackLocation(Irp);
1228
1229         /* Set Pending Returned */
1230         Irp->PendingReturned = StackPtr->Control & SL_PENDING_RETURNED;
1231
1232         /* Check if we failed */
1233         if (!NT_SUCCESS(Irp->IoStatus.Status))
1234         {
1235             /* Check if it was changed by a completion routine */
1236             if (Irp->IoStatus.Status != ErrorCode)
1237             {
1238                 /* Update the error for the current stack */
1239                 ErrorCode = Irp->IoStatus.Status;
1240                 StackPtr->Control |= SL_ERROR_RETURNED;
1241                 LastStackPtr->Parameters.Others.Argument4 = UlongToPtr(ErrorCode);
1242                 LastStackPtr->Control |= SL_ERROR_RETURNED;
1243             }
1244         }
1245
1246         /* Check if there is a Completion Routine to Call */
1247         if ((NT_SUCCESS(Irp->IoStatus.Status) &&
1248              (StackPtr->Control & SL_INVOKE_ON_SUCCESS)) ||
1249             (!NT_SUCCESS(Irp->IoStatus.Status) &&
1250              (StackPtr->Control & SL_INVOKE_ON_ERROR)) ||
1251             (Irp->Cancel &&
1252              (StackPtr->Control & SL_INVOKE_ON_CANCEL)))
1253         {
1254             /* Clear the stack location */
1255             IopClearStackLocation(StackPtr);
1256
1257             /* Check for highest-level device completion routines */
1258             if (Irp->CurrentLocation == (Irp->StackCount + 1))
1259             {
1260                 /* Clear the DO, since the current stack location is invalid */
1261                 DeviceObject = NULL;
1262             }
1263             else
1264             {
1265                 /* Otherwise, return the real one */
1266                 DeviceObject = IoGetCurrentIrpStackLocation(Irp)->DeviceObject;
1267             }
1268
1269             /* Call the completion routine */
1270             Status = StackPtr->CompletionRoutine(DeviceObject,
1271                                                  Irp,
1272                                                  StackPtr->Context);
1273
1274             /* Don't touch the Packet in this case, since it might be gone! */
1275             if (Status == STATUS_MORE_PROCESSING_REQUIRED) return;
1276         }
1277         else
1278         {
1279             /* Otherwise, check if this is a completed IRP */
1280             if ((Irp->CurrentLocation <= Irp->StackCount) &&
1281                 (Irp->PendingReturned))
1282             {
1283                 /* Mark it as pending */
1284                 IoMarkIrpPending(Irp);
1285             }
1286
1287             /* Clear the stack location */
1288             IopClearStackLocation(StackPtr);
1289         }
1290
1291         /* Move pointer to next stack location */
1292         StackPtr++;
1293     } while (Irp->CurrentLocation <= Irp->StackCount);
1294
1295     /* Check if the IRP is an associated IRP */
1296     if (Irp->Flags & IRP_ASSOCIATED_IRP)
1297     {
1298         /* Get the master IRP and count */
1299         MasterIrp = Irp->AssociatedIrp.MasterIrp;
1300         MasterCount = InterlockedDecrement(&MasterIrp->AssociatedIrp.IrpCount);
1301
1302         /* Free the MDLs */
1303         for (Mdl = Irp->MdlAddress; Mdl; Mdl = NextMdl)
1304         {
1305             /* Go to the next one */
1306             NextMdl = Mdl->Next;
1307             IoFreeMdl(Mdl);
1308         }
1309
1310         /* Free the IRP itself */
1311         IoFreeIrp(Irp);
1312
1313         /* Complete the Master IRP */
1314         if (!MasterCount) IofCompleteRequest(MasterIrp, PriorityBoost);
1315         return;
1316     }
1317
1318     /* We don't support this yet */
1319     ASSERT(Irp->IoStatus.Status != STATUS_REPARSE);
1320
1321     /* Check if we have an auxiliary buffer */
1322     if (Irp->Tail.Overlay.AuxiliaryBuffer)
1323     {
1324         /* Free it */
1325         ExFreePool(Irp->Tail.Overlay.AuxiliaryBuffer);
1326         Irp->Tail.Overlay.AuxiliaryBuffer = NULL;
1327     }
1328
1329     /* Check if this is a Paging I/O or Close Operation */
1330     if (Irp->Flags & (IRP_PAGING_IO | IRP_CLOSE_OPERATION))
1331     {
1332         /* Handle a Close Operation or Sync Paging I/O */
1333         if (Irp->Flags & (IRP_SYNCHRONOUS_PAGING_IO | IRP_CLOSE_OPERATION))
1334         {
1335             /* Set the I/O Status and Signal the Event */
1336             Flags = Irp->Flags & (IRP_SYNCHRONOUS_PAGING_IO | IRP_PAGING_IO);
1337             *Irp->UserIosb = Irp->IoStatus;
1338             KeSetEvent(Irp->UserEvent, PriorityBoost, FALSE);
1339
1340             /* Free the IRP for a Paging I/O Only, Close is handled by us */
1341             if (Flags) IoFreeIrp(Irp);
1342         }
1343         else
1344         {
1345 #if 0
1346             /* Page 166 */
1347             KeInitializeApc(&Irp->Tail.Apc
1348                             &Irp->Tail.Overlay.Thread->Tcb,
1349                             Irp->ApcEnvironment,
1350                             IopCompletePageWrite,
1351                             NULL,
1352                             NULL,
1353                             KernelMode,
1354                             NULL);
1355             KeInsertQueueApc(&Irp->Tail.Apc,
1356                              NULL,
1357                              NULL,
1358                              PriorityBoost);
1359 #else
1360             /* Not implemented yet. */
1361             DPRINT1("Not supported!\n");
1362             while (TRUE);
1363 #endif
1364         }
1365
1366         /* Get out of here */
1367         return;
1368     }
1369
1370     /* Unlock MDL Pages, page 167. */
1371     Mdl = Irp->MdlAddress;
1372     while (Mdl)
1373     {
1374                 MmUnlockPages(Mdl);
1375         Mdl = Mdl->Next;
1376     }
1377
1378     /* Check if we should exit because of a Deferred I/O (page 168) */
1379     if ((Irp->Flags & IRP_DEFER_IO_COMPLETION) && !(Irp->PendingReturned))
1380     {
1381         /*
1382          * Return without queuing the completion APC, since the caller will
1383          * take care of doing its own optimized completion at PASSIVE_LEVEL.
1384          */
1385         return;
1386     }
1387
1388     /* Get the thread and file object */
1389     Thread = Irp->Tail.Overlay.Thread;
1390     FileObject = Irp->Tail.Overlay.OriginalFileObject;
1391
1392     /* Make sure the IRP isn't canceled */
1393     if (!Irp->Cancel)
1394     {
1395         /* Initialize the APC */
1396         KeInitializeApc(&Irp->Tail.Apc,
1397                         &Thread->Tcb,
1398                         Irp->ApcEnvironment,
1399                         IopCompleteRequest,
1400                         NULL,
1401                         NULL,
1402                         KernelMode,
1403                         NULL);
1404
1405         /* Queue it */
1406         KeInsertQueueApc(&Irp->Tail.Apc,
1407                          FileObject,
1408                          NULL, /* This is used for REPARSE stuff */
1409                          PriorityBoost);
1410     }
1411     else
1412     {
1413         /* The IRP just got canceled... does a thread still own it? */
1414         Thread = Irp->Tail.Overlay.Thread;
1415         if (Thread)
1416         {
1417             /* Yes! There is still hope! Initialize the APC */
1418             KeInitializeApc(&Irp->Tail.Apc,
1419                             &Thread->Tcb,
1420                             Irp->ApcEnvironment,
1421                             IopCompleteRequest,
1422                             NULL,
1423                             NULL,
1424                             KernelMode,
1425                             NULL);
1426
1427             /* Queue it */
1428             KeInsertQueueApc(&Irp->Tail.Apc,
1429                              FileObject,
1430                              NULL, /* This is used for REPARSE stuff */
1431                              PriorityBoost);
1432         }
1433         else
1434         {
1435             /* Nothing left for us to do, kill it */
1436             ASSERT(Irp->Cancel);
1437             IopCleanupIrp(Irp, FileObject);
1438         }
1439     }
1440 }
1441
1442 NTSTATUS
1443 NTAPI
1444 IopSynchronousCompletion(IN PDEVICE_OBJECT DeviceObject,
1445                          IN PIRP Irp,
1446                          IN PVOID Context)
1447 {
1448     if (Irp->PendingReturned)
1449         KeSetEvent((PKEVENT)Context, IO_NO_INCREMENT, FALSE);
1450     return STATUS_MORE_PROCESSING_REQUIRED;
1451 }
1452
1453 /*
1454  * @implemented
1455  */
1456 BOOLEAN
1457 NTAPI
1458 IoForwardIrpSynchronously(IN PDEVICE_OBJECT DeviceObject,
1459                           IN PIRP Irp)
1460 {
1461     KEVENT Event;
1462     NTSTATUS Status;
1463
1464     /* Check if next stack location is available */
1465     if (Irp->CurrentLocation < Irp->StackCount)
1466     {
1467         /* No more stack location */
1468         return FALSE;
1469     }
1470
1471     /* Initialize event */
1472     KeInitializeEvent(&Event, NotificationEvent, FALSE);
1473
1474     /* Copy stack location for next driver */
1475     IoCopyCurrentIrpStackLocationToNext(Irp);
1476
1477     /* Set a completion routine, which will signal the event */
1478     IoSetCompletionRoutine(Irp, IopSynchronousCompletion, &Event, TRUE, TRUE, TRUE);
1479
1480     /* Call next driver */
1481     Status = IoCallDriver(DeviceObject, Irp);
1482
1483     /* Check if irp is pending */
1484     if (Status == STATUS_PENDING)
1485     {
1486         /* Yes, wait for its completion */
1487         KeWaitForSingleObject(&Event, Suspended, KernelMode, FALSE, NULL);
1488     }
1489
1490     /* Return success */
1491     return TRUE;
1492 }
1493
1494 /*
1495  * @implemented
1496  */
1497 VOID
1498 NTAPI
1499 IoFreeIrp(IN PIRP Irp)
1500 {
1501     PNPAGED_LOOKASIDE_LIST List;
1502     PP_NPAGED_LOOKASIDE_NUMBER ListType =  LookasideSmallIrpList;
1503     PKPRCB Prcb;
1504     IOTRACE(IO_IRP_DEBUG,
1505             "%s - Freeing IRPs %p\n",
1506             __FUNCTION__,
1507             Irp);
1508
1509     /* Make sure the Thread IRP list is empty and that it OK to free it */
1510     ASSERT(Irp->Type == IO_TYPE_IRP);
1511     ASSERT(IsListEmpty(&Irp->ThreadListEntry));
1512     ASSERT(Irp->CurrentLocation >= Irp->StackCount);
1513
1514     /* If this was a pool alloc, free it with the pool */
1515     if (!(Irp->AllocationFlags & IRP_ALLOCATED_FIXED_SIZE))
1516     {
1517         /* Free it */
1518         ExFreePoolWithTag(Irp, TAG_IRP);
1519     }
1520     else
1521     {
1522         /* Check if this was a Big IRP */
1523         if (Irp->StackCount != 1) ListType = LookasideLargeIrpList;
1524
1525         /* Get the PRCB */
1526         Prcb = KeGetCurrentPrcb();
1527
1528         /* Use the P List */
1529         List = (PNPAGED_LOOKASIDE_LIST)Prcb->PPLookasideList[ListType].P;
1530         List->L.TotalFrees++;
1531
1532         /* Check if the Free was within the Depth or not */
1533         if (ExQueryDepthSList(&List->L.ListHead) >= List->L.Depth)
1534         {
1535             /* Let the balancer know */
1536             List->L.FreeMisses++;
1537
1538             /* Use the L List */
1539             List = (PNPAGED_LOOKASIDE_LIST)Prcb->PPLookasideList[ListType].L;
1540             List->L.TotalFrees++;
1541
1542             /* Check if the Free was within the Depth or not */
1543             if (ExQueryDepthSList(&List->L.ListHead) >= List->L.Depth)
1544             {
1545                 /* All lists failed, use the pool */
1546                 List->L.FreeMisses++;
1547                 ExFreePoolWithTag(Irp, TAG_IRP);
1548                 Irp = NULL;
1549             }
1550         }
1551
1552         /* The free was within the Depth */
1553         if (Irp)
1554         {
1555            InterlockedPushEntrySList(&List->L.ListHead,
1556                                      (PSINGLE_LIST_ENTRY)Irp);
1557         }
1558     }
1559 }
1560
1561 /*
1562  * @implemented
1563  */
1564 IO_PAGING_PRIORITY
1565 FASTCALL
1566 IoGetPagingIoPriority(IN PIRP Irp)
1567 {
1568     IO_PAGING_PRIORITY Priority;
1569     ULONG Flags;
1570
1571     /* Get the flags */
1572     Flags = Irp->Flags;
1573
1574     /* Check what priority it has */
1575     if (Flags & 0x8000) // FIXME: Undocumented flag
1576     {
1577         /* High priority */
1578         Priority = IoPagingPriorityHigh;
1579     }
1580     else if (Flags & IRP_PAGING_IO)
1581     {
1582         /* Normal priority */
1583         Priority = IoPagingPriorityNormal;
1584     }
1585     else
1586     {
1587         /* Invalid -- not a paging IRP */
1588         Priority = IoPagingPriorityInvalid;
1589     }
1590
1591     /* Return the priority */
1592     return Priority;
1593 }
1594
1595 /*
1596  * @implemented
1597  */
1598 PEPROCESS
1599 NTAPI
1600 IoGetRequestorProcess(IN PIRP Irp)
1601 {
1602     /* Return the requestor process */
1603     return Irp->Tail.Overlay.Thread->ThreadsProcess;
1604 }
1605
1606 /*
1607  * @implemented
1608  */
1609 ULONG
1610 NTAPI
1611 IoGetRequestorProcessId(IN PIRP Irp)
1612 {
1613     /* Return the requestor process' id */
1614     return PtrToUlong(IoGetRequestorProcess(Irp)->UniqueProcessId);
1615 }
1616
1617 /*
1618  * @implemented
1619  */
1620 NTSTATUS
1621 NTAPI
1622 IoGetRequestorSessionId(IN PIRP Irp,
1623                         OUT PULONG pSessionId)
1624 {
1625     /* Return the session */
1626     *pSessionId = (ULONG_PTR)IoGetRequestorProcess(Irp)->Session;
1627     return STATUS_SUCCESS;
1628 }
1629
1630 /*
1631  * @implemented
1632  */
1633 PIRP
1634 NTAPI
1635 IoGetTopLevelIrp(VOID)
1636 {
1637     /* Return the IRP */
1638     return (PIRP)PsGetCurrentThread()->TopLevelIrp;
1639 }
1640
1641 /*
1642  * @implemented
1643  */
1644 VOID
1645 NTAPI
1646 IoInitializeIrp(IN PIRP Irp,
1647                 IN USHORT PacketSize,
1648                 IN CCHAR StackSize)
1649 {
1650     /* Clear it */
1651     IOTRACE(IO_IRP_DEBUG,
1652             "%s - Initializing IRP %p\n",
1653             __FUNCTION__,
1654             Irp);
1655     RtlZeroMemory(Irp, PacketSize);
1656
1657     /* Set the Header and other data */
1658     Irp->Type = IO_TYPE_IRP;
1659     Irp->Size = PacketSize;
1660     Irp->StackCount = StackSize;
1661     Irp->CurrentLocation = StackSize + 1;
1662     Irp->ApcEnvironment =  KeGetCurrentThread()->ApcStateIndex;
1663     Irp->Tail.Overlay.CurrentStackLocation = (PIO_STACK_LOCATION)(Irp + 1) + StackSize;
1664
1665     /* Initialize the Thread List */
1666     InitializeListHead(&Irp->ThreadListEntry);
1667 }
1668
1669 /*
1670  * @implemented
1671  */
1672 BOOLEAN
1673 NTAPI
1674 IoIsOperationSynchronous(IN PIRP Irp)
1675 {
1676     /* Check the flags */
1677     if (!(Irp->Flags & (IRP_PAGING_IO | IRP_SYNCHRONOUS_PAGING_IO)) &&
1678         ((Irp->Flags & IRP_SYNCHRONOUS_PAGING_IO) ||
1679          (Irp->Flags & IRP_SYNCHRONOUS_API) ||
1680          (IoGetCurrentIrpStackLocation(Irp)->FileObject->Flags &
1681           FO_SYNCHRONOUS_IO)))
1682     {
1683         /* Synch API or Paging I/O is OK, as is Sync File I/O */
1684         return TRUE;
1685     }
1686
1687     /* Otherwise, it is an asynchronous operation. */
1688     return FALSE;
1689 }
1690
1691 /*
1692  * @unimplemented
1693  */
1694 BOOLEAN
1695 NTAPI
1696 IoIsValidNameGraftingBuffer(IN PIRP Irp,
1697                             IN PREPARSE_DATA_BUFFER ReparseBuffer)
1698 {
1699     UNIMPLEMENTED;
1700     return FALSE;
1701 }
1702
1703 /*
1704  * @implemented
1705  */
1706 PIRP
1707 NTAPI
1708 IoMakeAssociatedIrp(IN PIRP Irp,
1709                     IN CCHAR StackSize)
1710 {
1711     PIRP AssocIrp;
1712     IOTRACE(IO_IRP_DEBUG,
1713             "%s - Associating IRP %p\n",
1714             __FUNCTION__,
1715             Irp);
1716
1717    /* Allocate the IRP */
1718    AssocIrp = IoAllocateIrp(StackSize, FALSE);
1719    if (!AssocIrp) return NULL;
1720
1721    /* Set the Flags */
1722    AssocIrp->Flags |= IRP_ASSOCIATED_IRP;
1723
1724    /* Set the Thread */
1725    AssocIrp->Tail.Overlay.Thread = Irp->Tail.Overlay.Thread;
1726
1727    /* Associate them */
1728    AssocIrp->AssociatedIrp.MasterIrp = Irp;
1729    return AssocIrp;
1730 }
1731
1732 /*
1733  * @implemented
1734  */
1735 VOID
1736 NTAPI
1737 IoQueueThreadIrp(IN PIRP Irp)
1738 {
1739     IOTRACE(IO_IRP_DEBUG,
1740             "%s - Queueing IRP %p\n",
1741             __FUNCTION__,
1742             Irp);
1743
1744     /* Use our inlined routine */
1745     IopQueueIrpToThread(Irp);
1746 }
1747
1748 /*
1749  * @implemented
1750  * Reference: Chris Cant's "Writing WDM Device Drivers"
1751  */
1752 VOID
1753 NTAPI
1754 IoReuseIrp(IN OUT PIRP Irp,
1755            IN NTSTATUS Status)
1756 {
1757     UCHAR AllocationFlags;
1758     IOTRACE(IO_IRP_DEBUG,
1759             "%s - Reusing IRP %p\n",
1760             __FUNCTION__,
1761             Irp);
1762
1763     /* Make sure it's OK to reuse it */
1764     ASSERT(!Irp->CancelRoutine);
1765     ASSERT(IsListEmpty(&Irp->ThreadListEntry));
1766
1767     /* Get the old flags */
1768     AllocationFlags = Irp->AllocationFlags;
1769
1770     /* Reinitialize the IRP */
1771     IoInitializeIrp(Irp, Irp->Size, Irp->StackCount);
1772
1773     /* Duplicate the data */
1774     Irp->IoStatus.Status = Status;
1775     Irp->AllocationFlags = AllocationFlags;
1776 }
1777
1778 /*
1779  * @implemented
1780  */
1781 VOID
1782 NTAPI
1783 IoSetTopLevelIrp(IN PIRP Irp)
1784 {
1785     /* Set the IRP */
1786     PsGetCurrentThread()->TopLevelIrp = (ULONG_PTR)Irp;
1787 }