src/WINNT/afsrdr/kernel/lib/AFSWrite.cpp

   1 /*
   2  * Copyright (c) 2008, 2009, 2010, 2011 Kernel Drivers, LLC.
   3  * Copyright (c) 2009, 2010, 2011 Your File System, Inc.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * - Redistributions of source code must retain the above copyright notice,
  11  *   this list of conditions and the following disclaimer.
  12  * - Redistributions in binary form must reproduce the above copyright
  13  *   notice,
  14  *   this list of conditions and the following disclaimer in the
  15  *   documentation
  16  *   and/or other materials provided with the distribution.
  17  * - Neither the names of Kernel Drivers, LLC and Your File System, Inc.
  18  *   nor the names of their contributors may be used to endorse or promote
  19  *   products derived from this software without specific prior written
  20  *   permission from Kernel Drivers, LLC and Your File System, Inc.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  23  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  24  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  25  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
  26  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  27  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  28  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  29  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  30  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  31  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  32  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 //
  36 // File: AFSWrite.cpp
  37 //
  38
  39 #include "AFSCommon.h"
  40
  41 static
  42 NTSTATUS
  43 AFSCachedWrite( IN PDEVICE_OBJECT DeviceObject,
  44                 IN PIRP Irp,
  45                 IN LARGE_INTEGER StartingByte,
  46                 IN ULONG ByteCount,
  47                 IN BOOLEAN ForceFlush);
  48 static
  49 NTSTATUS
  50 AFSNonCachedWrite( IN PDEVICE_OBJECT DeviceObject,
  51                    IN PIRP Irp,
  52                    IN LARGE_INTEGER StartingByte,
  53                    IN ULONG ByteCount);
  54
  55 static
  56 NTSTATUS
  57 AFSNonCachedWriteDirect( IN PDEVICE_OBJECT DeviceObject,
  58                          IN PIRP Irp,
  59                          IN LARGE_INTEGER StartingByte,
  60                          IN ULONG ByteCount);
  61
  62 static
  63 NTSTATUS
  64 AFSExtendingWrite( IN AFSFcb *Fcb,
  65                    IN PFILE_OBJECT FileObject,
  66                    IN LONGLONG NewLength);
  67
  68 //
  69 // Function: AFSWrite
  70 //
  71 // Description:
  72 //
  73 //      This is the dispatch handler for the IRP_MJ_WRITE request
  74 //
  75 // Return:
  76 //
  77 //      A status is returned for the function
  78 //
  79 NTSTATUS
  80 AFSWrite( IN PDEVICE_OBJECT LibDeviceObject,
  81           IN PIRP Irp)
  82 {
  83
  84     UNREFERENCED_PARAMETER(LibDeviceObject);
  85     NTSTATUS ntStatus = STATUS_SUCCESS;
  86
  87     __try
  88     {
  89
  90         ntStatus = AFSCommonWrite( AFSRDRDeviceObject, Irp, NULL, FALSE);
  91     }
  92     __except( AFSExceptionFilter( __FUNCTION__, GetExceptionCode(), GetExceptionInformation()) )
  93     {
  94
  95         ntStatus = STATUS_INSUFFICIENT_RESOURCES;
  96     }
  97
  98     return ntStatus;
  99 }
 100
 101 NTSTATUS
 102 AFSCommonWrite( IN PDEVICE_OBJECT DeviceObject,
 103                 IN PIRP Irp,
 104                 IN HANDLE OnBehalfOf,
 105                 IN BOOLEAN bRetry)
 106 {
 107
 108     NTSTATUS           ntStatus = STATUS_SUCCESS;
 109     AFSDeviceExt      *pDeviceExt = (AFSDeviceExt *)DeviceObject->DeviceExtension;
 110     IO_STACK_LOCATION *pIrpSp;
 111     AFSFcb            *pFcb = NULL;
 112     AFSCcb            *pCcb = NULL;
 113     AFSNonPagedFcb    *pNPFcb = NULL;
 114     ULONG              ulByteCount = 0;
 115     LARGE_INTEGER      liStartingByte;
 116     PFILE_OBJECT       pFileObject;
 117     BOOLEAN            bPagingIo = FALSE;
 118     BOOLEAN            bNonCachedIo = FALSE;
 119     BOOLEAN            bReleaseMain = FALSE;
 120     BOOLEAN            bReleaseSectionObject = FALSE;
 121     BOOLEAN            bReleasePaging = FALSE;
 122     BOOLEAN            bExtendingWrite = FALSE;
 123     BOOLEAN            bSynchronousFo = FALSE;
 124     BOOLEAN            bCompleteIrp = TRUE;
 125     BOOLEAN            bForceFlush = FALSE;
 126     BOOLEAN            bLockOK;
 127     HANDLE             hCallingUser = OnBehalfOf;
 128     ULONGLONG          ullProcessId = (ULONGLONG)PsGetCurrentProcessId();
 129     AFSDeviceExt       *pRDRDevExt = (AFSDeviceExt *)AFSRDRDeviceObject->DeviceExtension;
 130
 131     pIrpSp = IoGetCurrentIrpStackLocation( Irp);
 132
 133     __Enter
 134     {
 135
 136         Irp->IoStatus.Information = 0;
 137
 138         pFileObject = pIrpSp->FileObject;
 139
 140         //
 141         // Extract the fileobject references
 142         //
 143
 144         pFcb = (AFSFcb *)pFileObject->FsContext;
 145         pCcb = (AFSCcb *)pFileObject->FsContext2;
 146
 147         ObReferenceObject( pFileObject);
 148
 149         if( pFcb == NULL)
 150         {
 151
 152             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 153                           AFS_TRACE_LEVEL_ERROR,
 154                           "AFSCommonWrite Attempted write (%p) when pFcb == NULL\n",
 155                           Irp));
 156
 157             try_return( ntStatus = STATUS_INVALID_DEVICE_REQUEST);
 158         }
 159
 160         pNPFcb = pFcb->NPFcb;
 161
 162         //
 163         // If we are in shutdown mode then fail the request
 164         //
 165
 166         if( BooleanFlagOn( pDeviceExt->DeviceFlags, AFS_DEVICE_FLAG_REDIRECTOR_SHUTDOWN))
 167         {
 168
 169             AFSDbgTrace(( AFS_SUBSYSTEM_FILE_PROCESSING,
 170                           AFS_TRACE_LEVEL_WARNING,
 171                           "AFSCommonWrite (%p) Open request after shutdown\n",
 172                           Irp));
 173
 174             try_return( ntStatus = STATUS_TOO_LATE);
 175         }
 176
 177         liStartingByte = pIrpSp->Parameters.Write.ByteOffset;
 178         bPagingIo      = BooleanFlagOn( Irp->Flags, IRP_PAGING_IO);
 179         bNonCachedIo   = BooleanFlagOn( Irp->Flags, IRP_NOCACHE);
 180         ulByteCount    = pIrpSp->Parameters.Write.Length;
 181         bSynchronousFo = BooleanFlagOn( pFileObject->Flags, FO_SYNCHRONOUS_IO);
 182
 183         if( pFcb->Header.NodeTypeCode != AFS_IOCTL_FCB &&
 184             pFcb->Header.NodeTypeCode != AFS_FILE_FCB  &&
 185             pFcb->Header.NodeTypeCode != AFS_SPECIAL_SHARE_FCB)
 186         {
 187
 188             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 189                           AFS_TRACE_LEVEL_ERROR,
 190                           "AFSCommonWrite Attempted write (%p) on an invalid node type %08lX\n",
 191                           Irp,
 192                           pFcb->Header.NodeTypeCode));
 193
 194             try_return( ntStatus = STATUS_INVALID_DEVICE_REQUEST);
 195         }
 196
 197         //
 198         // If this is a write against an IOCtl node then handle it
 199         // in a different pathway
 200         //
 201
 202         if( pFcb->Header.NodeTypeCode == AFS_IOCTL_FCB)
 203         {
 204
 205             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 206                           AFS_TRACE_LEVEL_VERBOSE,
 207                           "AFSCommonWrite (%p) Processing file (PIOCTL) Offset %0I64X Length %08lX Irp Flags %08lX\n",
 208                           Irp,
 209                           liStartingByte.QuadPart,
 210                           ulByteCount,
 211                           Irp->Flags));
 212
 213             ntStatus = AFSIOCtlWrite( DeviceObject,
 214                                       Irp);
 215
 216             try_return( ntStatus);
 217         }
 218         else if( pFcb->Header.NodeTypeCode == AFS_SPECIAL_SHARE_FCB)
 219         {
 220
 221             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 222                           AFS_TRACE_LEVEL_VERBOSE,
 223                           "AFSCommonWrite (%p) Processing file (SHARE) Offset %0I64X Length %08lX Irp Flags %08lX\n",
 224                           Irp,
 225                           liStartingByte.QuadPart,
 226                           ulByteCount,
 227                           Irp->Flags));
 228
 229             ntStatus = AFSShareWrite( DeviceObject,
 230                                       Irp);
 231
 232             try_return( ntStatus);
 233         }
 234
 235         //
 236         // Is the Cache not there yet?  Exit.
 237         //
 238         if( !BooleanFlagOn( AFSLibControlFlags, AFS_REDIR_LIB_FLAGS_NONPERSISTENT_CACHE) &&
 239             !BooleanFlagOn( pRDRDevExt->DeviceFlags, AFS_REDIR_INIT_PERFORM_SERVICE_IO) &&
 240             NULL == pDeviceExt->Specific.RDR.CacheFileObject)
 241         {
 242
 243             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 244                           AFS_TRACE_LEVEL_ERROR,
 245                           "AFSCommonWrite (%p) Request failed due to AFS cache closed\n",
 246                           Irp));
 247
 248             try_return( ntStatus = STATUS_TOO_LATE );
 249         }
 250
 251         if( pFcb->ObjectInformation->VolumeCB != NULL &&
 252             BooleanFlagOn( pFcb->ObjectInformation->VolumeCB->VolumeInformation.FileSystemAttributes, FILE_READ_ONLY_VOLUME))
 253         {
 254
 255             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 256                           AFS_TRACE_LEVEL_ERROR,
 257                           "AFSCommonWrite (%p) Request failed due to read only volume\n",
 258                           Irp));
 259
 260             try_return( ntStatus = STATUS_ACCESS_DENIED);
 261         }
 262
 263         //
 264         // We need to know on whose behalf we have been called (which
 265         // we will eventually tell to the server - for non paging
 266         // writes).  If we were posted then we were told.  If this is
 267         // the first time we saw the irp then we grab it now.
 268         //
 269         if( NULL == OnBehalfOf )
 270         {
 271
 272             hCallingUser = PsGetCurrentProcessId();
 273         }
 274         else
 275         {
 276
 277             hCallingUser = OnBehalfOf;
 278         }
 279
 280         //
 281         // Check for zero length write
 282         //
 283
 284         if( ulByteCount == 0)
 285         {
 286
 287             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 288                           AFS_TRACE_LEVEL_VERBOSE,
 289                           "AFSCommonWrite (%p) Request completed due to zero length\n",
 290                           Irp));
 291
 292             try_return( ntStatus);
 293         }
 294
 295         //
 296         // Is this Fcb valid???
 297         //
 298
 299         if( BooleanFlagOn( pFcb->ObjectInformation->Flags, AFS_OBJECT_FLAGS_OBJECT_INVALID))
 300         {
 301
 302             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 303                           AFS_TRACE_LEVEL_ERROR,
 304                           "AFSCommonWrite (%p) Failing request due to INVALID fcb\n",
 305                           Irp));
 306
 307             try_return( ntStatus = STATUS_FILE_DELETED);
 308         }
 309
 310         if( BooleanFlagOn( pCcb->DirectoryCB->Flags, AFS_DIR_ENTRY_DELETED) ||
 311             BooleanFlagOn( pFcb->ObjectInformation->Flags, AFS_OBJECT_FLAGS_DELETED))
 312         {
 313
 314             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 315                           AFS_TRACE_LEVEL_ERROR,
 316                           "AFSCommonWrite (%p) Request failed due to file deleted\n",
 317                           Irp));
 318
 319             try_return( ntStatus = STATUS_FILE_DELETED);
 320         }
 321
 322         if( FlagOn( pIrpSp->MinorFunction, IRP_MN_COMPLETE))
 323         {
 324
 325             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 326                           AFS_TRACE_LEVEL_VERBOSE,
 327                           "AFSCommonWrite (%p) IRP_MN_COMPLETE being processed\n",
 328                           Irp));
 329
 330             CcMdlWriteComplete(pFileObject, &pIrpSp->Parameters.Write.ByteOffset, Irp->MdlAddress);
 331
 332             //
 333             // Mdl is now Deallocated
 334             //
 335
 336             Irp->MdlAddress = NULL;
 337
 338             try_return( ntStatus = STATUS_SUCCESS );
 339         }
 340
 341         //
 342         // If we get a non cached IO for a cached file we should do a purge.
 343         // For now we will just promote to cached
 344         //
 345         if( NULL != pFileObject->SectionObjectPointer->DataSectionObject && !bPagingIo && bNonCachedIo)
 346         {
 347             bNonCachedIo = FALSE;
 348             bForceFlush = TRUE;
 349         }
 350
 351         if ( !bNonCachedIo && !bPagingIo)
 352         {
 353
 354             if( pFileObject->PrivateCacheMap == NULL)
 355             {
 356
 357                 AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
 358                               AFS_TRACE_LEVEL_VERBOSE,
 359                               "AFSCommonWrite Acquiring Fcb SectionObject lock %p EXCL %08lX\n",
 360                               &pNPFcb->SectionObjectResource,
 361                               PsGetCurrentThread()));
 362
 363                 AFSAcquireExcl( &pNPFcb->SectionObjectResource,
 364                                 TRUE);
 365
 366                 bReleaseSectionObject = TRUE;
 367
 368                 __try
 369                 {
 370
 371                     AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 372                                   AFS_TRACE_LEVEL_VERBOSE,
 373                                   "AFSCommonWrite Initialize caching on Fcb %p FileObject %p\n",
 374                                   pFcb,
 375                                   pFileObject));
 376
 377                     CcInitializeCacheMap( pFileObject,
 378                                           (PCC_FILE_SIZES)&pFcb->Header.AllocationSize,
 379                                           FALSE,
 380                                           AFSLibCacheManagerCallbacks,
 381                                           pFcb);
 382
 383                     CcSetReadAheadGranularity( pFileObject,
 384                                                pDeviceExt->Specific.RDR.MaximumRPCLength);
 385
 386                     CcSetDirtyPageThreshold( pFileObject,
 387                                              AFS_DIRTY_CHUNK_THRESHOLD * pDeviceExt->Specific.RDR.MaximumRPCLength / 4096);
 388                 }
 389                 __except( EXCEPTION_EXECUTE_HANDLER)
 390                 {
 391
 392                     ntStatus = GetExceptionCode();
 393
 394                     AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 395                                   AFS_TRACE_LEVEL_ERROR,
 396                                   "AFSCommonWrite (%p) Exception thrown while initializing cache map Status %08lX\n",
 397                                   Irp,
 398                                   ntStatus));
 399                 }
 400
 401                 AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
 402                               AFS_TRACE_LEVEL_VERBOSE,
 403                               "AFSCommonWrite Releasing Fcb SectionObject lock %p EXCL %08lX\n",
 404                               &pNPFcb->SectionObjectResource,
 405                               PsGetCurrentThread()));
 406
 407                 AFSReleaseResource( &pNPFcb->SectionObjectResource);
 408
 409                 bReleaseSectionObject = FALSE;
 410
 411                 if( !NT_SUCCESS( ntStatus))
 412                 {
 413
 414                     try_return( ntStatus);
 415                 }
 416             }
 417
 418             if (!CcCanIWrite( pFileObject,
 419                               ulByteCount,
 420                               FALSE,
 421                               bRetry))
 422             {
 423
 424                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 425                               AFS_TRACE_LEVEL_WARNING,
 426                               "AFSCommonWrite (FO: %p) CcCanIWrite says No room for Offset %0I64X Length %08lX bytes! Deferring%s\n",
 427                               pFileObject,
 428                               liStartingByte.QuadPart,
 429                               ulByteCount,
 430                               bRetry ? " RETRY" : ""));
 431
 432                 ntStatus = AFSDeferWrite( DeviceObject, pFileObject, hCallingUser, Irp, ulByteCount, bRetry);
 433
 434                 if ( STATUS_PENDING == ntStatus)
 435                 {
 436
 437                     bCompleteIrp = FALSE;
 438                 }
 439                 else
 440                 {
 441
 442                     AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 443                                   AFS_TRACE_LEVEL_ERROR,
 444                                   "AFSCommonWrite (FO: %p) AFSDeferWrite failure Status %08lX\n",
 445                                   pFileObject,
 446                                   ntStatus));
 447                 }
 448
 449                 try_return( ntStatus);
 450             }
 451         }
 452
 453         //
 454         // Save off the PID if this is not a paging IO
 455         //
 456
 457         if( !bPagingIo &&
 458             ( pFcb->Specific.File.ExtentRequestProcessId == 0 ||
 459               ( ullProcessId != (ULONGLONG)AFSSysProcess &&
 460                 pFcb->Specific.File.ExtentRequestProcessId != ullProcessId)))
 461         {
 462
 463             pFcb->Specific.File.ExtentRequestProcessId = ullProcessId;
 464
 465             if( ullProcessId == (ULONGLONG)AFSSysProcess)
 466             {
 467                 AFSDbgTrace(( AFS_SUBSYSTEM_EXTENT_PROCESSING,
 468                               AFS_TRACE_LEVEL_WARNING,
 469                               "%s Setting LastWriterExtentProcessId to system process for Fcb %p\n",
 470                               __FUNCTION__,
 471                               pFcb));
 472             }
 473         }
 474
 475         //
 476         // Take locks
 477         //
 478         //   - if Paging then we need to do nothing (the precalls will
 479         //     have acquired the paging resource), for clarity we will collect
 480         //     the paging resource
 481         //   - If extending Write then take the fileresource EX (EOF will change, Allocation will only move out)
 482         //   - Otherwise we collect the file shared, check against extending and
 483         //
 484
 485         bLockOK = FALSE;
 486
 487         do
 488         {
 489
 490             if( bPagingIo)
 491             {
 492
 493                 //ASSERT( NULL != OnBehalfOf || ExIsResourceAcquiredLite( &pNPFcb->Resource ));
 494
 495                 AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
 496                               AFS_TRACE_LEVEL_VERBOSE,
 497                               "AFSCommonWrite Acquiring Fcb PagingIo lock %p SHARED %08lX\n",
 498                               &pNPFcb->PagingResource,
 499                               PsGetCurrentThread()));
 500
 501                 AFSAcquireShared( &pNPFcb->PagingResource,
 502                                   TRUE);
 503
 504                 bReleasePaging = TRUE;
 505
 506                 //
 507                 // We have the correct lock - we cannot have the wrong one
 508                 //
 509                 bLockOK = TRUE;
 510             }
 511             else
 512             {
 513
 514                 bExtendingWrite = (((liStartingByte.QuadPart + ulByteCount) >=
 515                                      pFcb->Header.FileSize.QuadPart) ||
 516                                     (liStartingByte.LowPart == FILE_WRITE_TO_END_OF_FILE &&
 517                                       liStartingByte.HighPart == -1)) ;
 518
 519                 if( bExtendingWrite || bNonCachedIo)
 520                 {
 521                     //
 522                     // Check for lock inversion
 523                     //
 524
 525                     ASSERT( !ExIsResourceAcquiredLite( &pNPFcb->PagingResource ));
 526
 527                     AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
 528                                   AFS_TRACE_LEVEL_VERBOSE,
 529                                   "AFSCommonWrite Acquiring Fcb lock %p EXCL %08lX\n",
 530                                   &pNPFcb->Resource,
 531                                   PsGetCurrentThread()));
 532
 533                     AFSAcquireExcl( &pNPFcb->Resource,
 534                                     TRUE);
 535
 536                     bReleaseMain = TRUE;
 537
 538                     AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
 539                                   AFS_TRACE_LEVEL_VERBOSE,
 540                                   "AFSCommonWrite Acquiring Fcb SectionObject lock %p EXCL %08lX\n",
 541                                   &pNPFcb->SectionObjectResource,
 542                                   PsGetCurrentThread()));
 543
 544                     AFSAcquireExcl( &pNPFcb->SectionObjectResource,
 545                                     TRUE);
 546
 547                     bReleaseSectionObject = TRUE;
 548
 549                     if (liStartingByte.LowPart == FILE_WRITE_TO_END_OF_FILE &&
 550                          liStartingByte.HighPart == -1)
 551                     {
 552                         if (pFcb->Header.ValidDataLength.QuadPart > pFcb->Header.FileSize.QuadPart)
 553                         {
 554                             liStartingByte = pFcb->Header.ValidDataLength;
 555                         }
 556                         else
 557                         {
 558                             liStartingByte = pFcb->Header.FileSize;
 559                         }
 560                     }
 561
 562                     //
 563                     // We have the correct lock - even if we don't end up truncating
 564                     //
 565                     bLockOK = TRUE;
 566                 }
 567                 else
 568                 {
 569                     ASSERT( !ExIsResourceAcquiredLite( &pNPFcb->PagingResource ));
 570
 571                     AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
 572                                   AFS_TRACE_LEVEL_VERBOSE,
 573                                   "AFSCommonWrite Acquiring Fcb lock %p SHARED %08lX\n",
 574                                   &pNPFcb->Resource,
 575                                   PsGetCurrentThread()));
 576
 577                     AFSAcquireShared( &pNPFcb->Resource,
 578                                       TRUE);
 579
 580                     bReleaseMain = TRUE;
 581
 582                     AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
 583                                   AFS_TRACE_LEVEL_VERBOSE,
 584                                   "AFSCommonWrite Acquiring Fcb SectionObject lock %p SHARED %08lX\n",
 585                                   &pNPFcb->SectionObjectResource,
 586                                   PsGetCurrentThread()));
 587
 588                     AFSAcquireShared( &pNPFcb->SectionObjectResource,
 589                                       TRUE);
 590
 591                     bReleaseSectionObject = TRUE;
 592
 593                     //
 594                     // Have things moved?  Are we extending? If so, the the lock isn't OK
 595                     //
 596                     bLockOK = (liStartingByte.QuadPart + ulByteCount) < pFcb->Header.FileSize.QuadPart;
 597
 598                     if (!bLockOK)
 599                     {
 600
 601                         AFSReleaseResource( &pNPFcb->SectionObjectResource);
 602
 603                         bReleaseSectionObject = FALSE;
 604
 605                         AFSReleaseResource( &pNPFcb->Resource);
 606
 607                         bReleaseMain = FALSE;
 608                     }
 609                 }
 610             }
 611         }
 612         while (!bLockOK);
 613
 614         if( !bPagingIo)
 615         {
 616
 617             //
 618             // Check the BR locks on the file.
 619             //
 620
 621             if ( !FsRtlCheckLockForWriteAccess( &pFcb->Specific.File.FileLock,
 622                                                 Irp))
 623             {
 624
 625                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 626                               AFS_TRACE_LEVEL_ERROR,
 627                               "AFSCommonWrite (%p) Request failed due to lock conflict\n",
 628                               Irp));
 629
 630                 try_return( ntStatus = STATUS_FILE_LOCK_CONFLICT);
 631             }
 632
 633             if( bExtendingWrite)
 634             {
 635
 636                 ntStatus = AFSExtendingWrite( pFcb, pFileObject, (liStartingByte.QuadPart + ulByteCount));
 637
 638                 if( !NT_SUCCESS(ntStatus))
 639                 {
 640
 641                     AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 642                                   AFS_TRACE_LEVEL_ERROR,
 643                                   "AFSCommonWrite (%p) Failed extending write request Status %08lX\n",
 644                                   Irp,
 645                                   ntStatus));
 646
 647                     try_return( ntStatus );
 648                 }
 649             }
 650         }
 651
 652         //
 653         // Fire off the request as appropriate
 654         //
 655         bCompleteIrp = FALSE;
 656
 657         if( !bPagingIo &&
 658             !bNonCachedIo)
 659         {
 660
 661             //
 662             // Main and SectionObject resources held Shared
 663             //
 664
 665             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 666                           AFS_TRACE_LEVEL_VERBOSE,
 667                           "AFSCommonWrite (%p) Processing CACHED request Offset %0I64X Len %08lX%s\n",
 668                           Irp,
 669                           liStartingByte.QuadPart,
 670                           ulByteCount,
 671                           bRetry ? " RETRY" : ""));
 672
 673             ntStatus = AFSCachedWrite( DeviceObject, Irp, liStartingByte, ulByteCount, bForceFlush);
 674         }
 675         else
 676         {
 677
 678             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 679                           AFS_TRACE_LEVEL_VERBOSE,
 680                           "AFSCommonWrite (%p) Processing NON-CACHED request Offset %0I64X Len %08lX%s\n",
 681                           Irp,
 682                           liStartingByte.QuadPart,
 683                           ulByteCount,
 684                           bRetry ? " RETRY" : ""));
 685
 686             if( BooleanFlagOn( pRDRDevExt->DeviceFlags, AFS_DEVICE_FLAG_DIRECT_SERVICE_IO))
 687             {
 688
 689                 ntStatus = AFSNonCachedWriteDirect( DeviceObject, Irp,  liStartingByte, ulByteCount);
 690             }
 691             else
 692             {
 693                 ntStatus = AFSNonCachedWrite( DeviceObject, Irp,  liStartingByte, ulByteCount);
 694             }
 695         }
 696
 697 try_exit:
 698
 699         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 700                       AFS_TRACE_LEVEL_VERBOSE,
 701                       "AFSCommonWrite (%p) Process complete Status %08lX\n",
 702                       Irp,
 703                       ntStatus));
 704
 705         if ( NT_SUCCESS( ntStatus))
 706         {
 707             if ( !bPagingIo)
 708             {
 709
 710                 if( bSynchronousFo)
 711                 {
 712
 713                     pFileObject->CurrentByteOffset.QuadPart = liStartingByte.QuadPart + ulByteCount;
 714                 }
 715
 716                 //
 717                 // If this extended the VDL, then update it accordingly.
 718                 // Increasing the VDL does not require a call to CcSetFileSizes.
 719                 //
 720
 721                 if( liStartingByte.QuadPart + ulByteCount > pFcb->Header.ValidDataLength.QuadPart)
 722                 {
 723
 724                     pFcb->Header.ValidDataLength.QuadPart = liStartingByte.QuadPart + ulByteCount;
 725                 }
 726
 727                 if( !BooleanFlagOn( pFcb->Flags, AFS_FCB_FLAG_UPDATE_LAST_WRITE_TIME))
 728                 {
 729
 730                     SetFlag( pFcb->Flags, AFS_FCB_FLAG_UPDATE_WRITE_TIME);
 731
 732                     KeQuerySystemTime( &pFcb->ObjectInformation->LastWriteTime);
 733                 }
 734             }
 735         }
 736
 737         if ( !bPagingIo && bNonCachedIo && CcIsFileCached( pFileObject) &&
 738              pNPFcb->SectionObjectPointers.DataSectionObject != NULL &&
 739              bReleaseSectionObject)
 740         {
 741             //
 742             // Regardless of whether or not the a non-paging non-cached write
 743             // succeeds or fails, if the file is cached the contents of the
 744             // cache are no longer up to date.  A CcPurgeCacheSection must be
 745             // performed to force subsequent cached reads to obtain the data
 746             // from the service.
 747             //
 748             // The Fcb Resource is dropped in order to permit filters that perform
 749             // an open via a worker thread in response to a purge to do so without
 750             // deadlocking.  The SectionObjectResource is held across the purge to
 751             // prevent racing with other cache operations.
 752             //
 753
 754             if( bReleaseMain)
 755             {
 756
 757                 AFSReleaseResource( &pNPFcb->Resource);
 758
 759                 bReleaseMain = FALSE;
 760             }
 761
 762             if ( !CcPurgeCacheSection( &pNPFcb->SectionObjectPointers,
 763                                        &liStartingByte,
 764                                        ulByteCount,
 765                                        FALSE))
 766             {
 767
 768                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 769                               AFS_TRACE_LEVEL_WARNING,
 770                               "AFSCommonWrite CcPurgeCacheSection failure FID %08lX-%08lX-%08lX-%08lX\n",
 771                               pFcb->ObjectInformation->FileId.Cell,
 772                               pFcb->ObjectInformation->FileId.Volume,
 773                               pFcb->ObjectInformation->FileId.Vnode,
 774                               pFcb->ObjectInformation->FileId.Unique));
 775
 776                 SetFlag( pFcb->Flags, AFS_FCB_FLAG_PURGE_ON_CLOSE);
 777             }
 778         }
 779
 780         ObDereferenceObject(pFileObject);
 781
 782         if( bReleaseSectionObject)
 783         {
 784
 785             AFSReleaseResource( &pNPFcb->SectionObjectResource);
 786         }
 787
 788         if( bReleasePaging)
 789         {
 790
 791             AFSReleaseResource( &pNPFcb->PagingResource);
 792         }
 793
 794         if( bReleaseMain)
 795         {
 796
 797             AFSReleaseResource( &pNPFcb->Resource);
 798         }
 799
 800         if( bCompleteIrp)
 801         {
 802
 803             AFSCompleteRequest( Irp,
 804                                 ntStatus);
 805         }
 806     }
 807
 808     return ntStatus;
 809 }
 810
 811 NTSTATUS
 812 AFSIOCtlWrite( IN PDEVICE_OBJECT DeviceObject,
 813                IN PIRP Irp)
 814 {
 815
 816     UNREFERENCED_PARAMETER(DeviceObject);
 817     NTSTATUS ntStatus = STATUS_SUCCESS;
 818     AFSPIOCtlIORequestCB stIORequestCB;
 819     PIO_STACK_LOCATION pIrpSp = IoGetCurrentIrpStackLocation( Irp);
 820     AFSFcb *pFcb = NULL;
 821     AFSCcb *pCcb = NULL;
 822     AFSPIOCtlIOResultCB stIOResultCB;
 823     ULONG ulBytesReturned = 0;
 824     AFSFileID stParentFID;
 825
 826     __Enter
 827     {
 828
 829         Irp->IoStatus.Information = 0;
 830
 831         RtlZeroMemory( &stIORequestCB,
 832                        sizeof( AFSPIOCtlIORequestCB));
 833
 834         if( pIrpSp->Parameters.Write.Length == 0)
 835         {
 836
 837             //
 838             // Nothing to do in this case
 839             //
 840
 841             try_return( ntStatus);
 842         }
 843
 844         pFcb = (AFSFcb *)pIrpSp->FileObject->FsContext;
 845
 846         pCcb = (AFSCcb *)pIrpSp->FileObject->FsContext2;
 847
 848         AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
 849                       AFS_TRACE_LEVEL_VERBOSE,
 850                       "AFSIOCtlWrite Acquiring Fcb lock %p SHARED %08lX\n",
 851                       &pFcb->NPFcb->Resource,
 852                       PsGetCurrentThread()));
 853
 854         AFSAcquireShared( &pFcb->NPFcb->Resource,
 855                           TRUE);
 856
 857         //
 858         // Get the parent fid to pass to the cm
 859         //
 860
 861         RtlZeroMemory( &stParentFID,
 862                        sizeof( AFSFileID));
 863
 864         if( BooleanFlagOn( pFcb->ObjectInformation->Flags, AFS_OBJECT_FLAGS_PARENT_FID))
 865         {
 866
 867             //
 868             // The parent directory FID of the node
 869             //
 870
 871             stParentFID = pFcb->ObjectInformation->ParentFileId;
 872         }
 873
 874         //
 875         // Set the control block up
 876         //
 877
 878         stIORequestCB.RequestId = pCcb->RequestID;
 879
 880         if( pFcb->ObjectInformation->VolumeCB != NULL)
 881         {
 882             stIORequestCB.RootId = pFcb->ObjectInformation->VolumeCB->ObjectInformation.FileId;
 883         }
 884
 885         //
 886         // Lock down the buffer
 887         //
 888
 889         stIORequestCB.MappedBuffer = AFSMapToService( Irp,
 890                                                       pIrpSp->Parameters.Write.Length);
 891
 892         if( stIORequestCB.MappedBuffer == NULL)
 893         {
 894
 895             try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES);
 896         }
 897
 898         stIORequestCB.BufferLength = pIrpSp->Parameters.Write.Length;
 899
 900         stIOResultCB.BytesProcessed = 0;
 901
 902         ulBytesReturned = sizeof( AFSPIOCtlIOResultCB);
 903
 904         //
 905         // Issue the request to the service
 906         //
 907
 908         ntStatus = AFSProcessRequest( AFS_REQUEST_TYPE_PIOCTL_WRITE,
 909                                       AFS_REQUEST_FLAG_SYNCHRONOUS,
 910                                       &pCcb->AuthGroup,
 911                                       NULL,
 912                                       &stParentFID,
 913                                       NULL,
 914                                       0,
 915                                       (void *)&stIORequestCB,
 916                                       sizeof( AFSPIOCtlIORequestCB),
 917                                       &stIOResultCB,
 918                                       &ulBytesReturned);
 919
 920         if( !NT_SUCCESS( ntStatus))
 921         {
 922
 923             try_return( ntStatus);
 924         }
 925
 926         //
 927         // Update the length written
 928         //
 929
 930         Irp->IoStatus.Information = stIOResultCB.BytesProcessed;
 931
 932 try_exit:
 933
 934         if( stIORequestCB.MappedBuffer != NULL)
 935         {
 936
 937             AFSUnmapServiceMappedBuffer( stIORequestCB.MappedBuffer,
 938                                          Irp->MdlAddress);
 939         }
 940
 941         if( pFcb != NULL)
 942         {
 943
 944             AFSReleaseResource( &pFcb->NPFcb->Resource);
 945         }
 946     }
 947
 948     return ntStatus;
 949 }
 950
 951 //
 952 // This function is called when we know we have to read from the AFS Cache.
 953 //
 954 // It ensures that we have exents for the entirety of the write and
 955 // then pins the extents into memory (meaning that although we may
 956 // add we will not remove).  Then it creates a scatter gather write
 957 // and fires off the IRPs
 958 //
 959 static
 960 NTSTATUS
 961 AFSNonCachedWrite( IN PDEVICE_OBJECT DeviceObject,
 962                    IN PIRP Irp,
 963                    IN LARGE_INTEGER StartingByte,
 964                    IN ULONG ByteCount)
 965 {
 966     NTSTATUS           ntStatus = STATUS_UNSUCCESSFUL;
 967     VOID              *pSystemBuffer = NULL;
 968     BOOLEAN            bPagingIo = BooleanFlagOn( Irp->Flags, IRP_PAGING_IO);
 969     BOOLEAN            bLocked = FALSE;
 970     BOOLEAN            bCompleteIrp = TRUE;
 971     AFSGatherIo       *pGatherIo = NULL;
 972     AFSIoRun          *pIoRuns = NULL;
 973     AFSIoRun           stIoRuns[AFS_MAX_STACK_IO_RUNS];
 974     ULONG              extentsCount = 0, runCount = 0;
 975     AFSExtent         *pStartExtent = NULL;
 976     AFSExtent         *pIgnoreExtent = NULL;
 977     IO_STACK_LOCATION *pIrpSp = IoGetCurrentIrpStackLocation( Irp);
 978     PFILE_OBJECT       pFileObject = pIrpSp->FileObject;
 979     AFSFcb            *pFcb = (AFSFcb *)pFileObject->FsContext;
 980     AFSCcb            *pCcb = (AFSCcb *)pFileObject->FsContext2;
 981     BOOLEAN            bSynchronousFo = BooleanFlagOn( pFileObject->Flags, FO_SYNCHRONOUS_IO);
 982     AFSDeviceExt      *pDevExt = (AFSDeviceExt *)DeviceObject->DeviceExtension;
 983     LARGE_INTEGER      liCurrentTime, liLastRequestTime;
 984     AFSDeviceExt      *pControlDevExt = (AFSDeviceExt *)AFSControlDeviceObject->DeviceExtension;
 985     PFILE_OBJECT       pCacheFileObject = NULL;
 986     BOOLEAN            bDerefExtents = FALSE;
 987
 988     __Enter
 989     {
 990
 991         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 992                       AFS_TRACE_LEVEL_VERBOSE,
 993                       "AFSNonCachedWrite (FO: %p) StartingByte %08lX:%08lX Length %08lX\n",
 994                       pFileObject,
 995                       StartingByte.HighPart,
 996                       StartingByte.LowPart,
 997                       ByteCount));
 998
 999         if (ByteCount > pDevExt->Specific.RDR.MaxIo.QuadPart)
1000         {
1001
1002             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1003                           AFS_TRACE_LEVEL_ERROR,
1004                           "AFSNonCachedWrite (%p) Request %08lX Actual %08lX larger than MaxIO %I64X\n",
1005                           Irp,
1006                           ByteCount,
1007                           pIrpSp->Parameters.Write.Length,
1008                           pDevExt->Specific.RDR.MaxIo.QuadPart));
1009
1010             try_return( ntStatus = STATUS_UNSUCCESSFUL);
1011         }
1012
1013         //
1014         // Get the mapping for the buffer
1015         //
1016         pSystemBuffer = AFSLockSystemBuffer( Irp,
1017                                              ByteCount);
1018
1019         if( pSystemBuffer == NULL)
1020         {
1021
1022             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1023                           AFS_TRACE_LEVEL_ERROR,
1024                           "AFSNonCachedWrite (%p) Failed to map system buffer\n",
1025                           Irp));
1026
1027             try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES);
1028         }
1029
1030
1031         //
1032         // Provoke a get of the extents - if we need to.
1033         //
1034
1035         AFSDbgTrace(( AFS_SUBSYSTEM_EXTENT_PROCESSING,
1036                       AFS_TRACE_LEVEL_VERBOSE,
1037                       "AFSNonCachedWrite Requesting extents for fid %08lX-%08lX-%08lX-%08lX Offset %0I64X Length %08lX\n",
1038                       pFcb->ObjectInformation->FileId.Cell,
1039                       pFcb->ObjectInformation->FileId.Volume,
1040                       pFcb->ObjectInformation->FileId.Vnode,
1041                       pFcb->ObjectInformation->FileId.Unique,
1042                       StartingByte.QuadPart,
1043                       ByteCount));
1044
1045         ntStatus = AFSRequestExtentsAsync( pFcb,
1046                                            pCcb,
1047                                            &StartingByte,
1048                                            ByteCount);
1049
1050         if (!NT_SUCCESS(ntStatus))
1051         {
1052
1053             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1054                           AFS_TRACE_LEVEL_ERROR,
1055                           "AFSNonCachedWrite (%p) Failed to request extents Status %08lX\n",
1056                           Irp,
1057                           ntStatus));
1058
1059             try_return( ntStatus);
1060         }
1061
1062         KeQueryTickCount( &liLastRequestTime);
1063
1064         while (TRUE)
1065         {
1066
1067             AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1068                           AFS_TRACE_LEVEL_VERBOSE,
1069                           "AFSNonCachedWrite Acquiring Fcb extents lock %p SHARED %08lX\n",
1070                           &pFcb->NPFcb->Specific.File.ExtentsResource,
1071                           PsGetCurrentThread()));
1072
1073             ASSERT( !ExIsResourceAcquiredLite( &pFcb->NPFcb->Specific.File.ExtentsResource ));
1074
1075             AFSAcquireShared( &pFcb->NPFcb->Specific.File.ExtentsResource, TRUE );
1076             bLocked = TRUE;
1077
1078             pStartExtent = NULL;
1079             pIgnoreExtent = NULL;
1080
1081             if ( AFSDoExtentsMapRegion( pFcb, &StartingByte, ByteCount, &pStartExtent, &pIgnoreExtent ))
1082             {
1083                 break;
1084             }
1085
1086             KeClearEvent( &pFcb->NPFcb->Specific.File.ExtentsRequestComplete );
1087
1088             AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1089                           AFS_TRACE_LEVEL_VERBOSE,
1090                           "AFSNonCachedWrite Releasing(1) Fcb extents lock %p SHARED %08lX\n",
1091                           &pFcb->NPFcb->Specific.File.ExtentsResource,
1092                           PsGetCurrentThread()));
1093
1094             AFSReleaseResource( &pFcb->NPFcb->Specific.File.ExtentsResource );
1095             bLocked= FALSE;
1096
1097             //
1098             // We will re-request the extents after waiting for them
1099             //
1100
1101             KeQueryTickCount( &liCurrentTime);
1102
1103             if( liCurrentTime.QuadPart - liLastRequestTime.QuadPart >= pControlDevExt->Specific.Control.ExtentRequestTimeCount.QuadPart)
1104             {
1105
1106                 AFSDbgTrace(( AFS_SUBSYSTEM_EXTENT_PROCESSING,
1107                               AFS_TRACE_LEVEL_VERBOSE,
1108                               "AFSNonCachedWrite Requesting extents, again, for fid %08lX-%08lX-%08lX-%08lX Offset %0I64X Length %08lX\n",
1109                               pFcb->ObjectInformation->FileId.Cell,
1110                               pFcb->ObjectInformation->FileId.Volume,
1111                               pFcb->ObjectInformation->FileId.Vnode,
1112                               pFcb->ObjectInformation->FileId.Unique,
1113                               StartingByte.QuadPart,
1114                               ByteCount));
1115
1116                 ntStatus = AFSRequestExtentsAsync( pFcb,
1117                                                    pCcb,
1118                                                    &StartingByte,
1119                                                    ByteCount);
1120
1121                 if (!NT_SUCCESS(ntStatus))
1122                 {
1123
1124                     AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1125                                   AFS_TRACE_LEVEL_ERROR,
1126                                   "AFSNonCachedWrite (%p) Failed to request extents Status %08lX\n",
1127                                   Irp,
1128                                   ntStatus));
1129
1130                     try_return( ntStatus);
1131                 }
1132
1133                 KeQueryTickCount( &liLastRequestTime);
1134             }
1135
1136
1137             AFSDbgTrace(( AFS_SUBSYSTEM_EXTENT_PROCESSING,
1138                           AFS_TRACE_LEVEL_VERBOSE,
1139                           "AFSNonCachedWrite Waiting for extents for fid %08lX-%08lX-%08lX-%08lX Offset %0I64X Length %08lX\n",
1140                           pFcb->ObjectInformation->FileId.Cell,
1141                           pFcb->ObjectInformation->FileId.Volume,
1142                           pFcb->ObjectInformation->FileId.Vnode,
1143                           pFcb->ObjectInformation->FileId.Unique,
1144                           StartingByte.QuadPart,
1145                           ByteCount));
1146
1147             //
1148             // Wait for it
1149             //
1150
1151             ntStatus =  AFSWaitForExtentMapping ( pFcb, pCcb);
1152
1153             if (!NT_SUCCESS(ntStatus))
1154             {
1155
1156                 AFSDbgTrace(( AFS_SUBSYSTEM_EXTENT_PROCESSING,
1157                               AFS_TRACE_LEVEL_ERROR,
1158                               "AFSNonCachedWrite Failed wait for extents for fid %08lX-%08lX-%08lX-%08lX Offset %0I64X Length %08lX Status %08lX\n",
1159                               pFcb->ObjectInformation->FileId.Cell,
1160                               pFcb->ObjectInformation->FileId.Volume,
1161                               pFcb->ObjectInformation->FileId.Vnode,
1162                               pFcb->ObjectInformation->FileId.Unique,
1163                               StartingByte.QuadPart,
1164                               ByteCount,
1165                               ntStatus));
1166
1167                 try_return( ntStatus);
1168             }
1169         }
1170
1171         //
1172         // As per the read path -
1173         //
1174
1175         AFSDbgTrace(( AFS_SUBSYSTEM_EXTENT_PROCESSING,
1176                       AFS_TRACE_LEVEL_VERBOSE,
1177                       "AFSNonCachedWrite Extents located for fid %08lX-%08lX-%08lX-%08lX Offset %0I64X Length %08lX\n",
1178                       pFcb->ObjectInformation->FileId.Cell,
1179                       pFcb->ObjectInformation->FileId.Volume,
1180                       pFcb->ObjectInformation->FileId.Vnode,
1181                       pFcb->ObjectInformation->FileId.Unique,
1182                       StartingByte.QuadPart,
1183                       ByteCount));
1184
1185         ntStatus = AFSGetExtents( pFcb,
1186                                   &StartingByte,
1187                                   ByteCount,
1188                                   pStartExtent,
1189                                   &extentsCount,
1190                                   &runCount);
1191
1192         if (!NT_SUCCESS(ntStatus))
1193         {
1194
1195             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1196                           AFS_TRACE_LEVEL_ERROR,
1197                           "AFSNonCachedWrite (%p) Failed to retrieve mapped extents Status %08lX\n",
1198                           Irp,
1199                           ntStatus));
1200
1201             try_return( ntStatus );
1202         }
1203
1204         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1205                       AFS_TRACE_LEVEL_VERBOSE,
1206                       "AFSNonCachedWrite (%p) Successfully retrieved map extents count %d run count %d\n",
1207                       Irp,
1208                       extentsCount,
1209                       runCount));
1210
1211         if( BooleanFlagOn( AFSLibControlFlags, AFS_REDIR_LIB_FLAGS_NONPERSISTENT_CACHE))
1212         {
1213
1214             Irp->IoStatus.Information = ByteCount;
1215
1216 #if GEN_MD5
1217             //
1218             // Setup the MD5 for each extent
1219             //
1220
1221             AFSSetupMD5Hash( pFcb,
1222                              pStartExtent,
1223                              extentsCount,
1224                              pSystemBuffer,
1225                              &StartingByte,
1226                              ByteCount);
1227 #endif
1228
1229             ntStatus = AFSProcessExtentRun( pSystemBuffer,
1230                                             &StartingByte,
1231                                             ByteCount,
1232                                             pStartExtent,
1233                                             TRUE);
1234
1235             if (!NT_SUCCESS(ntStatus))
1236             {
1237
1238                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1239                               AFS_TRACE_LEVEL_ERROR,
1240                               "AFSNonCachedWrite (%p) Failed to process extent run for non-persistent cache Status %08lX\n",
1241                               Irp,
1242                               ntStatus));
1243             }
1244
1245             try_return( ntStatus);
1246         }
1247
1248         //
1249         // Retrieve the cache file object
1250         //
1251
1252         pCacheFileObject = AFSReferenceCacheFileObject();
1253
1254         if( pCacheFileObject == NULL)
1255         {
1256
1257             ntStatus = STATUS_DEVICE_NOT_READY;
1258
1259             AFSDbgTrace(( AFS_SUBSYSTEM_EXTENT_PROCESSING,
1260                           AFS_TRACE_LEVEL_ERROR,
1261                           "AFSNonCachedWrite Failed to retrieve cache fileobject for fid %08lX-%08lX-%08lX-%08lX Offset %0I64X Length %08lX Status %08lX\n",
1262                           pFcb->ObjectInformation->FileId.Cell,
1263                           pFcb->ObjectInformation->FileId.Volume,
1264                           pFcb->ObjectInformation->FileId.Vnode,
1265                           pFcb->ObjectInformation->FileId.Unique,
1266                           StartingByte.QuadPart,
1267                           ByteCount,
1268                           ntStatus));
1269
1270             try_return( ntStatus);
1271         }
1272
1273         if (runCount > AFS_MAX_STACK_IO_RUNS)
1274         {
1275
1276             pIoRuns = (AFSIoRun*) AFSExAllocatePoolWithTag( PagedPool,
1277                                                             runCount * sizeof( AFSIoRun ),
1278                                                             AFS_IO_RUN_TAG );
1279             if (NULL == pIoRuns)
1280             {
1281
1282                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1283                               AFS_TRACE_LEVEL_ERROR,
1284                               "AFSNonCachedWrite (%p) Failed to allocate IO run block\n",
1285                               Irp));
1286
1287                 try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES );
1288             }
1289         }
1290         else
1291         {
1292
1293             pIoRuns = stIoRuns;
1294         }
1295
1296         RtlZeroMemory( pIoRuns, runCount * sizeof( AFSIoRun ));
1297
1298         ntStatus = AFSSetupIoRun( IoGetRelatedDeviceObject( pCacheFileObject),
1299                                   Irp,
1300                                   pSystemBuffer,
1301                                   pIoRuns,
1302                                   &StartingByte,
1303                                   ByteCount,
1304                                   pStartExtent,
1305                                   &runCount );
1306
1307         if (!NT_SUCCESS(ntStatus))
1308         {
1309
1310             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1311                           AFS_TRACE_LEVEL_ERROR,
1312                           "AFSNonCachedWrite (%p) Failed to initialize IO run block Status %08lX\n",
1313                           Irp,
1314                           ntStatus));
1315
1316             try_return( ntStatus );
1317         }
1318
1319         AFSReferenceActiveExtents( pStartExtent,
1320                                    extentsCount);
1321
1322         bDerefExtents = TRUE;
1323
1324         AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1325                       AFS_TRACE_LEVEL_VERBOSE,
1326                       "AFSNonCachedWrite Releasing(2) Fcb extents lock %p SHARED %08lX\n",
1327                       &pFcb->NPFcb->Specific.File.ExtentsResource,
1328                       PsGetCurrentThread()));
1329
1330         AFSReleaseResource( &pFcb->NPFcb->Specific.File.ExtentsResource );
1331         bLocked = FALSE;
1332
1333         pGatherIo = (AFSGatherIo*) AFSExAllocatePoolWithTag( NonPagedPool,
1334                                                              sizeof( AFSGatherIo),
1335                                                              AFS_GATHER_TAG);
1336
1337         if (NULL == pGatherIo)
1338         {
1339
1340             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1341                           AFS_TRACE_LEVEL_ERROR,
1342                           "AFSNonCachedWrite (%p) Failed to allocate IO gather block\n",
1343                           Irp));
1344
1345             AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1346                           AFS_TRACE_LEVEL_VERBOSE,
1347                           "AFSNonCachedWrite Acquiring(1) Fcb extents lock %p SHARED %08lX\n",
1348                           &pFcb->NPFcb->Specific.File.ExtentsResource,
1349                           PsGetCurrentThread()));
1350
1351             AFSAcquireShared( &pFcb->NPFcb->Specific.File.ExtentsResource,
1352                               TRUE);
1353             bLocked = TRUE;
1354
1355             AFSDereferenceActiveExtents( pStartExtent,
1356                                          extentsCount);
1357
1358             try_return (ntStatus = STATUS_INSUFFICIENT_RESOURCES );
1359         }
1360
1361         RtlZeroMemory( pGatherIo, sizeof( AFSGatherIo ));
1362
1363         //
1364         // Initialize count to 1, that was we won't get an early
1365         // completion if the first irp completes before the second is
1366         // queued.
1367         //
1368         pGatherIo->Count = 1;
1369         pGatherIo->Status = STATUS_SUCCESS;
1370         pGatherIo->MasterIrp = Irp;
1371         pGatherIo->Synchronous = TRUE;
1372         pGatherIo->CompleteMasterIrp = FALSE;
1373
1374         bCompleteIrp = TRUE;
1375
1376         if( pGatherIo->Synchronous)
1377         {
1378             KeInitializeEvent( &pGatherIo->Event, NotificationEvent, FALSE );
1379         }
1380
1381 #if GEN_MD5
1382         //
1383         // Setup the MD5 for each extent
1384         //
1385
1386         AFSSetupMD5Hash( pFcb,
1387                          pStartExtent,
1388                          extentsCount,
1389                          pSystemBuffer,
1390                          &StartingByte,
1391                          ByteCount);
1392 #endif
1393
1394         //
1395         // Pre-emptively set up the count
1396         //
1397
1398         Irp->IoStatus.Information = ByteCount;
1399
1400         ntStatus = AFSQueueStartIos( pCacheFileObject,
1401                                      IRP_MJ_WRITE,
1402                                      IRP_WRITE_OPERATION | IRP_SYNCHRONOUS_API,
1403                                      pIoRuns,
1404                                      runCount,
1405                                      pGatherIo);
1406
1407         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1408                       AFS_TRACE_LEVEL_VERBOSE,
1409                       "AFSNonCachedWrite (%p) AFSStartIos completed Status %08lX\n",
1410                       Irp,
1411                       ntStatus));
1412
1413         if( !NT_SUCCESS( ntStatus))
1414         {
1415
1416             AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1417                           AFS_TRACE_LEVEL_VERBOSE,
1418                           "AFSNonCachedWrite Acquiring(2) Fcb extents lock %p SHARED %08lX\n",
1419                           &pFcb->NPFcb->Specific.File.ExtentsResource,
1420                           PsGetCurrentThread()));
1421
1422             AFSAcquireShared( &pFcb->NPFcb->Specific.File.ExtentsResource,
1423                               TRUE);
1424             bLocked = TRUE;
1425
1426             AFSDereferenceActiveExtents( pStartExtent,
1427                                          extentsCount);
1428
1429             try_return( ntStatus);
1430         }
1431
1432         //
1433         // Wait for completion of All IOs we started.
1434         //
1435
1436         ntStatus = KeWaitForSingleObject( &pGatherIo->Event,
1437                                           Executive,
1438                                           KernelMode,
1439                                           FALSE,
1440                                           NULL);
1441
1442         if( NT_SUCCESS( ntStatus))
1443         {
1444
1445             ntStatus = pGatherIo->Status;
1446         }
1447
1448         if( !NT_SUCCESS( ntStatus))
1449         {
1450
1451             AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1452                           AFS_TRACE_LEVEL_VERBOSE,
1453                           "AFSNonCachedWrite Acquiring(3) Fcb extents lock %p SHARED %08lX\n",
1454                           &pFcb->NPFcb->Specific.File.ExtentsResource,
1455                           PsGetCurrentThread()));
1456
1457             AFSAcquireShared( &pFcb->NPFcb->Specific.File.ExtentsResource,
1458                               TRUE);
1459             bLocked = TRUE;
1460
1461             AFSDereferenceActiveExtents( pStartExtent,
1462                                          extentsCount);
1463
1464             try_return( ntStatus);
1465         }
1466
1467 try_exit:
1468
1469         if( NT_SUCCESS( ntStatus) &&
1470             pStartExtent != NULL &&
1471             Irp->IoStatus.Information > 0)
1472         {
1473
1474             if ( !bLocked)
1475             {
1476
1477                 AFSAcquireShared( &pFcb->NPFcb->Specific.File.ExtentsResource,
1478                                   TRUE);
1479                 bLocked = TRUE;
1480             }
1481
1482             //
1483             // Since this is dirty we can mark the extents dirty now.
1484             // AFSMarkDirty will dereference the extents.  Do not call
1485             // AFSDereferenceActiveExtents() in this code path.
1486             //
1487
1488             AFSMarkDirty( pFcb,
1489                           pStartExtent,
1490                           extentsCount,
1491                           &StartingByte,
1492                           bDerefExtents);
1493
1494             if (!bPagingIo)
1495             {
1496                 //
1497                 // This was an uncached user write - tell the server to do
1498                 // the flush when the worker thread next wakes up
1499                 //
1500                 pFcb->Specific.File.LastServerFlush.QuadPart = 0;
1501             }
1502         }
1503
1504         if( pCacheFileObject != NULL)
1505         {
1506             AFSReleaseCacheFileObject( pCacheFileObject);
1507         }
1508
1509         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1510                       AFS_TRACE_LEVEL_VERBOSE,
1511                       "AFSNonCachedWrite (FO: %p) StartingByte %08lX:%08lX Length %08lX Status %08lX\n",
1512                       pFileObject,
1513                       StartingByte.HighPart,
1514                       StartingByte.LowPart,
1515                       ByteCount,
1516                       ntStatus));
1517
1518         if (NT_SUCCESS(ntStatus) &&
1519             !bPagingIo &&
1520             bSynchronousFo)
1521         {
1522
1523             pFileObject->CurrentByteOffset.QuadPart = StartingByte.QuadPart + ByteCount;
1524         }
1525
1526         if( bLocked)
1527         {
1528
1529             AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1530                           AFS_TRACE_LEVEL_VERBOSE,
1531                           "AFSNonCachedWrite Releasing Fcb extents lock %p SHARED %08lX\n",
1532                           &pFcb->NPFcb->Specific.File.ExtentsResource,
1533                           PsGetCurrentThread()));
1534
1535             AFSReleaseResource( &pFcb->NPFcb->Specific.File.ExtentsResource );
1536         }
1537
1538         if( pGatherIo)
1539         {
1540             AFSExFreePoolWithTag(pGatherIo, AFS_GATHER_TAG);
1541         }
1542
1543         if( NULL != pIoRuns &&
1544             stIoRuns != pIoRuns)
1545         {
1546             AFSExFreePoolWithTag(pIoRuns, AFS_IO_RUN_TAG);
1547         }
1548
1549         if( bCompleteIrp)
1550         {
1551
1552             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1553                           AFS_TRACE_LEVEL_VERBOSE,
1554                           "AFSNonCachedWrite Completing Irp %p Status %08lX Info %08lX\n",
1555                           Irp,
1556                           ntStatus,
1557                           Irp->IoStatus.Information));
1558
1559             AFSCompleteRequest( Irp, ntStatus);
1560         }
1561     }
1562
1563     return ntStatus;
1564 }
1565
1566 static
1567 NTSTATUS
1568 AFSNonCachedWriteDirect( IN PDEVICE_OBJECT DeviceObject,
1569                          IN PIRP Irp,
1570                          IN LARGE_INTEGER StartingByte,
1571                          IN ULONG ByteCount)
1572 {
1573     NTSTATUS           ntStatus = STATUS_UNSUCCESSFUL;
1574     VOID              *pSystemBuffer = NULL;
1575     BOOLEAN            bPagingIo = BooleanFlagOn( Irp->Flags, IRP_PAGING_IO);
1576     IO_STACK_LOCATION *pIrpSp = IoGetCurrentIrpStackLocation( Irp);
1577     PFILE_OBJECT       pFileObject = pIrpSp->FileObject;
1578     AFSFcb            *pFcb = (AFSFcb *)pFileObject->FsContext;
1579     AFSCcb            *pCcb = (AFSCcb *)pFileObject->FsContext2;
1580     BOOLEAN            bSynchronousFo = BooleanFlagOn( pFileObject->Flags, FO_SYNCHRONOUS_IO);
1581     BOOLEAN            bNoIntermediateBuffering = BooleanFlagOn( pFileObject->Flags, FO_NO_INTERMEDIATE_BUFFERING);
1582     AFSDeviceExt      *pDevExt = (AFSDeviceExt *)DeviceObject->DeviceExtension;
1583     AFSFileIOCB        stFileIORequest;
1584     AFSFileIOResultCB  stFileIOResult;
1585     ULONG              ulResultLen = 0;
1586     ULONG              ulFlags;
1587
1588     __Enter
1589     {
1590         Irp->IoStatus.Information = 0;
1591
1592         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1593                       AFS_TRACE_LEVEL_VERBOSE,
1594                       "AFSNonCachedWriteDirect (FO: %p) StartingByte %08lX:%08lX Length %08lX\n",
1595                       pFileObject,
1596                       StartingByte.HighPart,
1597                       StartingByte.LowPart,
1598                       ByteCount));
1599
1600         if (ByteCount > pDevExt->Specific.RDR.MaxIo.QuadPart)
1601         {
1602
1603             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1604                           AFS_TRACE_LEVEL_ERROR,
1605                           "AFSNonCachedWriteDirect (%p) Request %08lX Actual %08lX larger than MaxIO %I64X\n",
1606                           Irp,
1607                           ByteCount,
1608                           pIrpSp->Parameters.Write.Length,
1609                           pDevExt->Specific.RDR.MaxIo.QuadPart));
1610
1611             try_return( ntStatus = STATUS_UNSUCCESSFUL);
1612         }
1613
1614         //
1615         // Get the mapping for the buffer
1616         //
1617         pSystemBuffer = AFSLockSystemBuffer( Irp,
1618                                              ByteCount);
1619
1620         if( pSystemBuffer == NULL)
1621         {
1622
1623             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1624                           AFS_TRACE_LEVEL_ERROR,
1625                           "AFSNonCachedWriteDirect (%p) Failed to map system buffer\n",
1626                           Irp));
1627
1628             try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES);
1629         }
1630
1631         //
1632         // Issue the request at the service for processing
1633         //
1634
1635         ulResultLen = sizeof( AFSFileIOResultCB);
1636
1637         RtlZeroMemory( &stFileIORequest,
1638                        sizeof( AFSFileIOCB));
1639
1640         RtlZeroMemory( &stFileIOResult,
1641                        sizeof( AFSFileIOResultCB));
1642
1643         stFileIORequest.SystemIOBuffer = pSystemBuffer;
1644
1645         stFileIORequest.SystemIOBufferMdl = Irp->MdlAddress;
1646
1647         stFileIORequest.IOLength = ByteCount;
1648
1649         stFileIORequest.IOOffset = StartingByte;
1650
1651         ulFlags = AFS_REQUEST_FLAG_SYNCHRONOUS;
1652
1653         if ( bNoIntermediateBuffering)
1654         {
1655
1656             ulFlags |= AFS_REQUEST_FLAG_CACHE_BYPASS;
1657         }
1658
1659         //
1660         // Update file metadata
1661         //
1662
1663         stFileIORequest.EndOfFile = pFcb->ObjectInformation->EndOfFile;
1664
1665         stFileIORequest.CreateTime = pFcb->ObjectInformation->CreationTime;
1666
1667         stFileIORequest.ChangeTime = pFcb->ObjectInformation->ChangeTime;
1668
1669         stFileIORequest.LastAccessTime = pFcb->ObjectInformation->LastAccessTime;
1670
1671         stFileIORequest.LastWriteTime = pFcb->ObjectInformation->LastWriteTime;
1672
1673         //
1674         // Write the data to the service
1675         //
1676
1677         ntStatus = AFSProcessRequest( AFS_REQUEST_TYPE_PROCESS_WRITE_FILE,
1678                                       ulFlags,
1679                                       &pCcb->AuthGroup,
1680                                       &pCcb->DirectoryCB->NameInformation.FileName,
1681                                       &pFcb->ObjectInformation->FileId,
1682                                       pFcb->ObjectInformation->VolumeCB->VolumeInformation.Cell,
1683                                       pFcb->ObjectInformation->VolumeCB->VolumeInformation.CellLength,
1684                                       &stFileIORequest,
1685                                       sizeof( AFSFileIOCB),
1686                                       &stFileIOResult,
1687                                       &ulResultLen);
1688
1689         if( NT_SUCCESS( ntStatus))
1690         {
1691
1692             Irp->IoStatus.Information = (ULONG_PTR)stFileIOResult.Length;
1693         }
1694         else
1695         {
1696
1697             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1698                           AFS_TRACE_LEVEL_ERROR,
1699                           "AFSNonCachedWriteDirect (%p) Failed to send write to service Status %08lX\n",
1700                           Irp,
1701                           ntStatus));
1702         }
1703
1704 try_exit:
1705
1706         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1707                       AFS_TRACE_LEVEL_VERBOSE,
1708                       "AFSNonCachedWriteDirect (FO: %p) StartingByte %08lX:%08lX Length %08lX Status %08lX\n",
1709                       pFileObject,
1710                       StartingByte.HighPart,
1711                       StartingByte.LowPart,
1712                       ByteCount,
1713                       ntStatus));
1714
1715         if (NT_SUCCESS(ntStatus) &&
1716             !bPagingIo &&
1717             bSynchronousFo)
1718         {
1719
1720             pFileObject->CurrentByteOffset.QuadPart = StartingByte.QuadPart + ByteCount;
1721         }
1722
1723         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1724                       AFS_TRACE_LEVEL_VERBOSE,
1725                       "AFSNonCachedWriteDirect Completing Irp %p Status %08lX Info %08lX\n",
1726                       Irp,
1727                       ntStatus,
1728                       Irp->IoStatus.Information));
1729
1730         AFSCompleteRequest( Irp, ntStatus);
1731     }
1732
1733     return ntStatus;
1734 }
1735
1736 static
1737 NTSTATUS
1738 AFSCachedWrite( IN PDEVICE_OBJECT DeviceObject,
1739                 IN PIRP Irp,
1740                 IN LARGE_INTEGER StartingByte,
1741                 IN ULONG ByteCount,
1742                 IN BOOLEAN ForceFlush)
1743 {
1744     UNREFERENCED_PARAMETER(DeviceObject);
1745     PVOID              pSystemBuffer = NULL;
1746     NTSTATUS           ntStatus = STATUS_SUCCESS;
1747     IO_STATUS_BLOCK    iosbFlush;
1748     IO_STACK_LOCATION *pIrpSp = IoGetCurrentIrpStackLocation( Irp);
1749     PFILE_OBJECT       pFileObject = pIrpSp->FileObject;
1750     AFSFcb            *pFcb = (AFSFcb *)pFileObject->FsContext;
1751     BOOLEAN            bSynchronousFo = BooleanFlagOn( pFileObject->Flags, FO_SYNCHRONOUS_IO);
1752     ULONG              ulCurrentIO = 0, ulTotalLen = ByteCount;
1753     PMDL               pCurrentMdl = Irp->MdlAddress;
1754     LARGE_INTEGER      liCurrentOffset;
1755
1756     __Enter
1757     {
1758
1759         Irp->IoStatus.Information = 0;
1760
1761         if( BooleanFlagOn( pIrpSp->MinorFunction, IRP_MN_MDL))
1762         {
1763
1764             __try
1765             {
1766
1767                 CcPrepareMdlWrite( pFileObject,
1768                                    &StartingByte,
1769                                    ByteCount,
1770                                    &Irp->MdlAddress,
1771                                    &Irp->IoStatus);
1772
1773                 ntStatus = Irp->IoStatus.Status;
1774             }
1775             __except( EXCEPTION_EXECUTE_HANDLER)
1776             {
1777                 ntStatus = GetExceptionCode();
1778
1779                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1780                               AFS_TRACE_LEVEL_ERROR,
1781                               "AFSCachedWrite (%p) Exception thrown while preparing mdl write Status %08lX\n",
1782                               Irp,
1783                               ntStatus));
1784             }
1785
1786             if( !NT_SUCCESS( ntStatus))
1787             {
1788
1789                 //
1790                 // Free up any potentially allocated mdl's
1791                 //
1792
1793                 CcMdlWriteComplete( pFileObject,
1794                                     &StartingByte,
1795                                     Irp->MdlAddress);
1796
1797                 Irp->MdlAddress = NULL;
1798
1799                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1800                               AFS_TRACE_LEVEL_ERROR,
1801                               "AFSCachedWrite (%p) Failed to process MDL write Status %08lX\n",
1802                               Irp,
1803                               ntStatus));
1804             }
1805
1806             try_return( ntStatus);
1807         }
1808
1809         liCurrentOffset.QuadPart = StartingByte.QuadPart;
1810
1811         while( ulTotalLen > 0)
1812         {
1813
1814             ntStatus = STATUS_SUCCESS;
1815
1816             if( pCurrentMdl != NULL)
1817             {
1818
1819                 pSystemBuffer = MmGetSystemAddressForMdlSafe( pCurrentMdl,
1820                                                               NormalPagePriority);
1821
1822                 ulCurrentIO = MmGetMdlByteCount( pCurrentMdl);
1823
1824                 if( ulCurrentIO > ulTotalLen)
1825                 {
1826                     ulCurrentIO = ulTotalLen;
1827                 }
1828             }
1829             else
1830             {
1831
1832                 pSystemBuffer = AFSLockSystemBuffer( Irp,
1833                                                      ulTotalLen);
1834
1835                 ulCurrentIO = ulTotalLen;
1836             }
1837
1838             if( pSystemBuffer == NULL)
1839             {
1840
1841                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1842                               AFS_TRACE_LEVEL_ERROR,
1843                               "AFSCachedWrite (%p) Failed to lock system buffer\n",
1844                               Irp));
1845
1846                 try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES);
1847             }
1848
1849             __try
1850             {
1851
1852                 if( !CcCopyWrite( pFileObject,
1853                                   &liCurrentOffset,
1854                                   ulCurrentIO,
1855                                   TRUE,
1856                                   pSystemBuffer))
1857                 {
1858                     //
1859                     // Failed to process request.
1860                     //
1861
1862                     AFSDbgTrace(( AFS_SUBSYSTEM_FILE_PROCESSING,
1863                                   AFS_TRACE_LEVEL_ERROR,
1864                                   "AFSCachedWrite (%p) Failed to issue CcCopyWrite %wZ @ %0I64X Status %08lX\n",
1865                                   Irp,
1866                                   &pFileObject->FileName,
1867                                   liCurrentOffset.QuadPart,
1868                                   Irp->IoStatus.Status));
1869
1870                     try_return( ntStatus = STATUS_UNSUCCESSFUL);
1871                 }
1872             }
1873             __except( EXCEPTION_EXECUTE_HANDLER)
1874             {
1875
1876                 ntStatus = GetExceptionCode();
1877
1878                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1879                               AFS_TRACE_LEVEL_ERROR,
1880                               "AFSCachedWrite (%p) CcCopyWrite Threw exception %wZ @ %0I64X Status %08lX\n",
1881                               Irp,
1882                               &pFileObject->FileName,
1883                               liCurrentOffset.QuadPart,
1884                               ntStatus));
1885             }
1886
1887             if( !NT_SUCCESS( ntStatus))
1888             {
1889                 try_return( ntStatus);
1890             }
1891
1892             if( ForceFlush ||
1893                 BooleanFlagOn(pFileObject->Flags, (FO_NO_INTERMEDIATE_BUFFERING + FO_WRITE_THROUGH)))
1894             {
1895
1896                 //
1897                 // We have detected a file we do a write through with.
1898                 //
1899
1900                 CcFlushCache(&pFcb->NPFcb->SectionObjectPointers,
1901                              &liCurrentOffset,
1902                              ulCurrentIO,
1903                              &iosbFlush);
1904
1905                 if( !NT_SUCCESS( iosbFlush.Status))
1906                 {
1907
1908                     AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1909                                   AFS_TRACE_LEVEL_ERROR,
1910                                   "AFSCachedWrite (%p) CcFlushCache failure %wZ FID %08lX-%08lX-%08lX-%08lX Status 0x%08lX Bytes 0x%08lX\n",
1911                                   Irp,
1912                                   &pFileObject->FileName,
1913                                   pFcb->ObjectInformation->FileId.Cell,
1914                                   pFcb->ObjectInformation->FileId.Volume,
1915                                   pFcb->ObjectInformation->FileId.Vnode,
1916                                   pFcb->ObjectInformation->FileId.Unique,
1917                                   iosbFlush.Status,
1918                                   iosbFlush.Information));
1919
1920                     try_return( ntStatus = iosbFlush.Status);
1921                 }
1922             }
1923
1924             if( ulTotalLen <= ulCurrentIO)
1925             {
1926                 break;
1927             }
1928
1929             liCurrentOffset.QuadPart += ulCurrentIO;
1930
1931             ulTotalLen -= ulCurrentIO;
1932
1933             pCurrentMdl = pCurrentMdl->Next;
1934         }
1935
1936 try_exit:
1937
1938         if( NT_SUCCESS( ntStatus))
1939         {
1940
1941             Irp->IoStatus.Information = ByteCount;
1942
1943             if ( ForceFlush ||
1944                  BooleanFlagOn(pFileObject->Flags, (FO_NO_INTERMEDIATE_BUFFERING + FO_WRITE_THROUGH)))
1945             {
1946                 //
1947                 // Write through asked for... Set things so that we get
1948                 // flush when the worker thread next wakes up
1949                 //
1950                 pFcb->Specific.File.LastServerFlush.QuadPart = 0;
1951             }
1952         }
1953
1954         AFSCompleteRequest( Irp,
1955                             ntStatus);
1956     }
1957
1958     return ntStatus;
1959 }
1960
1961 static
1962 NTSTATUS
1963 AFSExtendingWrite( IN AFSFcb *Fcb,
1964                    IN PFILE_OBJECT FileObject,
1965                    IN LONGLONG NewLength)
1966 {
1967     LARGE_INTEGER liSaveFileSize = Fcb->Header.FileSize;
1968     LARGE_INTEGER liSaveAllocation = Fcb->Header.AllocationSize;
1969     NTSTATUS      ntStatus = STATUS_SUCCESS;
1970     AFSCcb       *pCcb = (AFSCcb *)FileObject->FsContext2;
1971
1972     if( NewLength > Fcb->Header.AllocationSize.QuadPart)
1973     {
1974
1975         Fcb->Header.AllocationSize.QuadPart = NewLength;
1976
1977         Fcb->ObjectInformation->AllocationSize = Fcb->Header.AllocationSize;
1978     }
1979
1980     if( NewLength > Fcb->Header.FileSize.QuadPart)
1981     {
1982
1983         Fcb->Header.FileSize.QuadPart = NewLength;
1984
1985         Fcb->ObjectInformation->EndOfFile = Fcb->Header.FileSize;
1986     }
1987
1988     //
1989     // Tell the server
1990     //
1991
1992     ntStatus = AFSUpdateFileInformation( &Fcb->ObjectInformation->ParentFileId,
1993                                          Fcb->ObjectInformation,
1994                                          &pCcb->AuthGroup);
1995
1996     if (NT_SUCCESS(ntStatus))
1997     {
1998
1999         KeQuerySystemTime( &Fcb->ObjectInformation->ChangeTime);
2000
2001         SetFlag( Fcb->Flags, AFS_FCB_FLAG_FILE_MODIFIED | AFS_FCB_FLAG_UPDATE_CHANGE_TIME);
2002
2003         //
2004         // If the file is currently cached, then let the MM know about the extension
2005         //
2006
2007         if( CcIsFileCached( FileObject))
2008         {
2009             CcSetFileSizes( FileObject,
2010                             (PCC_FILE_SIZES)&Fcb->Header.AllocationSize);
2011         }
2012     }
2013     else
2014     {
2015         Fcb->Header.FileSize = liSaveFileSize;
2016         Fcb->Header.AllocationSize = liSaveAllocation;
2017     }
2018
2019     //
2020     // DownConvert file resource to shared
2021     //
2022     ExConvertExclusiveToSharedLite( &Fcb->NPFcb->Resource);
2023
2024     return ntStatus;
2025 }
2026
2027 NTSTATUS
2028 AFSShareWrite( IN PDEVICE_OBJECT DeviceObject,
2029                IN PIRP Irp)
2030 {
2031
2032     UNREFERENCED_PARAMETER(DeviceObject);
2033     NTSTATUS ntStatus = STATUS_SUCCESS;
2034     PIO_STACK_LOCATION pIrpSp = IoGetCurrentIrpStackLocation( Irp);
2035     AFSFcb *pFcb = NULL;
2036     AFSCcb *pCcb = NULL;
2037     AFSPipeIORequestCB *pIoRequest = NULL;
2038     void *pBuffer = NULL;
2039     AFSPipeIOResultCB stIoResult;
2040     ULONG ulBytesReturned = 0;
2041
2042     __Enter
2043     {
2044
2045         pFcb = (AFSFcb *)pIrpSp->FileObject->FsContext;
2046
2047         pCcb = (AFSCcb *)pIrpSp->FileObject->FsContext2;
2048
2049         AFSDbgTrace(( AFS_SUBSYSTEM_PIPE_PROCESSING,
2050                       AFS_TRACE_LEVEL_VERBOSE,
2051                       "AFSShareWrite On pipe %wZ Length %08lX\n",
2052                       &pCcb->DirectoryCB->NameInformation.FileName,
2053                       pIrpSp->Parameters.Write.Length));
2054
2055         if( pIrpSp->Parameters.Write.Length == 0)
2056         {
2057
2058             //
2059             // Nothing to do in this case
2060             //
2061
2062             try_return( ntStatus);
2063         }
2064
2065         //
2066         // Retrieve the buffer for the read request
2067         //
2068
2069         pBuffer = AFSLockSystemBuffer( Irp,
2070                                        pIrpSp->Parameters.Write.Length);
2071
2072         if( pBuffer == NULL)
2073         {
2074
2075             AFSDbgTrace(( AFS_SUBSYSTEM_PIPE_PROCESSING,
2076                           AFS_TRACE_LEVEL_ERROR,
2077                           "AFSShareWrite Failed to map buffer on pipe %wZ\n",
2078                           &pCcb->DirectoryCB->NameInformation.FileName));
2079
2080             try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES);
2081         }
2082
2083         AFSAcquireShared( &pFcb->NPFcb->Resource,
2084                           TRUE);
2085
2086         pIoRequest = (AFSPipeIORequestCB *)AFSExAllocatePoolWithTag( PagedPool,
2087                                                                      sizeof( AFSPipeIORequestCB) +
2088                                                                                 pIrpSp->Parameters.Write.Length,
2089                                                                      AFS_GENERIC_MEMORY_14_TAG);
2090
2091         if( pIoRequest == NULL)
2092         {
2093
2094             try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES);
2095         }
2096
2097         RtlZeroMemory( pIoRequest,
2098                        sizeof( AFSPipeIORequestCB) + pIrpSp->Parameters.Write.Length);
2099
2100         pIoRequest->RequestId = pCcb->RequestID;
2101
2102         pIoRequest->RootId = pFcb->ObjectInformation->VolumeCB->ObjectInformation.FileId;
2103
2104         pIoRequest->BufferLength = pIrpSp->Parameters.Write.Length;
2105
2106         RtlCopyMemory( (void *)((char *)pIoRequest + sizeof( AFSPipeIORequestCB)),
2107                        pBuffer,
2108                        pIrpSp->Parameters.Write.Length);
2109
2110         stIoResult.BytesProcessed = 0;
2111
2112         ulBytesReturned = sizeof( AFSPipeIOResultCB);
2113
2114         //
2115         // Issue the open request to the service
2116         //
2117
2118         ntStatus = AFSProcessRequest( AFS_REQUEST_TYPE_PIPE_WRITE,
2119                                       AFS_REQUEST_FLAG_SYNCHRONOUS,
2120                                       &pCcb->AuthGroup,
2121                                       &pCcb->DirectoryCB->NameInformation.FileName,
2122                                       NULL,
2123                                       NULL,
2124                                       0,
2125                                       pIoRequest,
2126                                       sizeof( AFSPipeIORequestCB) +
2127                                                 pIrpSp->Parameters.Write.Length,
2128                                       &stIoResult,
2129                                       &ulBytesReturned);
2130
2131         if( !NT_SUCCESS( ntStatus))
2132         {
2133
2134             AFSDbgTrace(( AFS_SUBSYSTEM_FILE_PROCESSING,
2135                           AFS_TRACE_LEVEL_ERROR,
2136                           "AFSShareWrite (%p) Failed service write Status %08lX\n",
2137                           Irp,
2138                           ntStatus));
2139
2140             try_return( ntStatus);
2141         }
2142
2143         AFSDbgTrace(( AFS_SUBSYSTEM_PIPE_PROCESSING,
2144                       AFS_TRACE_LEVEL_VERBOSE,
2145                       "AFSShareWrite Completed on pipe %wZ Length read %08lX\n",
2146                       &pCcb->DirectoryCB->NameInformation.FileName,
2147                       stIoResult.BytesProcessed));
2148
2149         Irp->IoStatus.Information = stIoResult.BytesProcessed;
2150
2151 try_exit:
2152
2153         if( pFcb != NULL)
2154         {
2155
2156             AFSReleaseResource( &pFcb->NPFcb->Resource);
2157         }
2158
2159         if( pIoRequest != NULL)
2160         {
2161
2162             AFSExFreePoolWithTag( pIoRequest, AFS_GENERIC_MEMORY_14_TAG);
2163         }
2164     }
2165
2166     return ntStatus;
2167 }