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

   1 /*
   2  * Copyright (c) 2008, 2009, 2010, 2011 Kernel Drivers, LLC.
   3  * Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014 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            bWriteToEndOfFile = FALSE;
 125     BOOLEAN            bWait = FALSE;
 126     BOOLEAN            bCompleteIrp = TRUE;
 127     BOOLEAN            bForceFlush = FALSE;
 128     BOOLEAN            bLockOK;
 129     HANDLE             hCallingUser = OnBehalfOf;
 130     ULONGLONG          ullProcessId = (ULONGLONG)PsGetCurrentProcessId();
 131     AFSDeviceExt       *pRDRDevExt = (AFSDeviceExt *)AFSRDRDeviceObject->DeviceExtension;
 132
 133     pIrpSp = IoGetCurrentIrpStackLocation( Irp);
 134
 135     __Enter
 136     {
 137
 138         Irp->IoStatus.Information = 0;
 139
 140         pFileObject = pIrpSp->FileObject;
 141
 142         //
 143         // Extract the fileobject references
 144         //
 145
 146         pFcb = (AFSFcb *)pFileObject->FsContext;
 147         pCcb = (AFSCcb *)pFileObject->FsContext2;
 148
 149         ObReferenceObject( pFileObject);
 150
 151         if( pFcb == NULL)
 152         {
 153
 154             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 155                           AFS_TRACE_LEVEL_ERROR,
 156                           "AFSCommonWrite Attempted write (%p) when pFcb == NULL\n",
 157                           Irp));
 158
 159             try_return( ntStatus = STATUS_INVALID_DEVICE_REQUEST);
 160         }
 161
 162         pNPFcb = pFcb->NPFcb;
 163
 164         //
 165         // If we are in shutdown mode then fail the request
 166         //
 167
 168         if( BooleanFlagOn( pDeviceExt->DeviceFlags, AFS_DEVICE_FLAG_REDIRECTOR_SHUTDOWN))
 169         {
 170
 171             AFSDbgTrace(( AFS_SUBSYSTEM_FILE_PROCESSING,
 172                           AFS_TRACE_LEVEL_WARNING,
 173                           "AFSCommonWrite (%p) Open request after shutdown\n",
 174                           Irp));
 175
 176             try_return( ntStatus = STATUS_TOO_LATE);
 177         }
 178
 179         liStartingByte = pIrpSp->Parameters.Write.ByteOffset;
 180         bPagingIo      = BooleanFlagOn( Irp->Flags, IRP_PAGING_IO);
 181         bNonCachedIo   = BooleanFlagOn( Irp->Flags, IRP_NOCACHE);
 182         bWait          = IoIsOperationSynchronous( Irp);
 183         ulByteCount    = pIrpSp->Parameters.Write.Length;
 184         bSynchronousFo = BooleanFlagOn( pFileObject->Flags, FO_SYNCHRONOUS_IO);
 185
 186         if( pFcb->Header.NodeTypeCode != AFS_IOCTL_FCB &&
 187             pFcb->Header.NodeTypeCode != AFS_FILE_FCB  &&
 188             pFcb->Header.NodeTypeCode != AFS_SPECIAL_SHARE_FCB)
 189         {
 190
 191             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 192                           AFS_TRACE_LEVEL_ERROR,
 193                           "AFSCommonWrite Attempted write (%p) on an invalid node type %08lX\n",
 194                           Irp,
 195                           pFcb->Header.NodeTypeCode));
 196
 197             try_return( ntStatus = STATUS_INVALID_DEVICE_REQUEST);
 198         }
 199
 200         //
 201         // If this is a write against an IOCtl node then handle it
 202         // in a different pathway
 203         //
 204
 205         if( pFcb->Header.NodeTypeCode == AFS_IOCTL_FCB)
 206         {
 207
 208             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 209                           AFS_TRACE_LEVEL_VERBOSE,
 210                           "AFSCommonWrite (%p) Processing file (PIOCTL) Offset %0I64X Length %08lX Irp Flags %08lX\n",
 211                           Irp,
 212                           liStartingByte.QuadPart,
 213                           ulByteCount,
 214                           Irp->Flags));
 215
 216             ntStatus = AFSIOCtlWrite( DeviceObject,
 217                                       Irp);
 218
 219             try_return( ntStatus);
 220         }
 221         else if( pFcb->Header.NodeTypeCode == AFS_SPECIAL_SHARE_FCB)
 222         {
 223
 224             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 225                           AFS_TRACE_LEVEL_VERBOSE,
 226                           "AFSCommonWrite (%p) Processing file (SHARE) Offset %0I64X Length %08lX Irp Flags %08lX\n",
 227                           Irp,
 228                           liStartingByte.QuadPart,
 229                           ulByteCount,
 230                           Irp->Flags));
 231
 232             ntStatus = AFSShareWrite( DeviceObject,
 233                                       Irp);
 234
 235             try_return( ntStatus);
 236         }
 237
 238         //
 239         // Is the Cache not there yet?  Exit.
 240         //
 241         if( !BooleanFlagOn( AFSLibControlFlags, AFS_REDIR_LIB_FLAGS_NONPERSISTENT_CACHE) &&
 242             !BooleanFlagOn( pRDRDevExt->DeviceFlags, AFS_REDIR_INIT_PERFORM_SERVICE_IO) &&
 243             NULL == pDeviceExt->Specific.RDR.CacheFileObject)
 244         {
 245
 246             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 247                           AFS_TRACE_LEVEL_ERROR,
 248                           "AFSCommonWrite (%p) Request failed due to AFS cache closed\n",
 249                           Irp));
 250
 251             try_return( ntStatus = STATUS_TOO_LATE );
 252         }
 253
 254         if( pFcb->ObjectInformation->VolumeCB != NULL &&
 255             BooleanFlagOn( pFcb->ObjectInformation->VolumeCB->VolumeInformation.FileSystemAttributes, FILE_READ_ONLY_VOLUME))
 256         {
 257
 258             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 259                           AFS_TRACE_LEVEL_ERROR,
 260                           "AFSCommonWrite (%p) Request failed due to read only volume\n",
 261                           Irp));
 262
 263             try_return( ntStatus = STATUS_MEDIA_WRITE_PROTECTED);
 264         }
 265
 266         //
 267         // We need to know on whose behalf we have been called (which
 268         // we will eventually tell to the server - for non paging
 269         // writes).  If we were posted then we were told.  If this is
 270         // the first time we saw the irp then we grab it now.
 271         //
 272         if( NULL == OnBehalfOf )
 273         {
 274
 275             hCallingUser = PsGetCurrentProcessId();
 276         }
 277         else
 278         {
 279
 280             hCallingUser = OnBehalfOf;
 281         }
 282
 283         //
 284         // Check for zero length write
 285         //
 286
 287         if( ulByteCount == 0)
 288         {
 289
 290             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 291                           AFS_TRACE_LEVEL_VERBOSE,
 292                           "AFSCommonWrite (%p) Request completed due to zero length\n",
 293                           Irp));
 294
 295             try_return( ntStatus);
 296         }
 297
 298         //
 299         // Is this Fcb valid???
 300         //
 301
 302         if( BooleanFlagOn( pFcb->ObjectInformation->Flags, AFS_OBJECT_FLAGS_OBJECT_INVALID))
 303         {
 304
 305             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 306                           AFS_TRACE_LEVEL_ERROR,
 307                           "AFSCommonWrite (%p) Failing request due to INVALID fcb\n",
 308                           Irp));
 309
 310             try_return( ntStatus = STATUS_FILE_DELETED);
 311         }
 312
 313         if( BooleanFlagOn( pCcb->DirectoryCB->Flags, AFS_DIR_ENTRY_DELETED) ||
 314             BooleanFlagOn( pFcb->ObjectInformation->Flags, AFS_OBJECT_FLAGS_DELETED))
 315         {
 316
 317             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 318                           AFS_TRACE_LEVEL_ERROR,
 319                           "AFSCommonWrite (%p) Request failed due to file deleted\n",
 320                           Irp));
 321
 322             try_return( ntStatus = STATUS_FILE_DELETED);
 323         }
 324
 325         if( FlagOn( pIrpSp->MinorFunction, IRP_MN_COMPLETE))
 326         {
 327
 328             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 329                           AFS_TRACE_LEVEL_VERBOSE,
 330                           "AFSCommonWrite (%p) IRP_MN_COMPLETE being processed\n",
 331                           Irp));
 332
 333             CcMdlWriteComplete(pFileObject, &pIrpSp->Parameters.Write.ByteOffset, Irp->MdlAddress);
 334
 335             //
 336             // Mdl is now Deallocated
 337             //
 338
 339             Irp->MdlAddress = NULL;
 340
 341             try_return( ntStatus = STATUS_SUCCESS );
 342         }
 343
 344         //
 345         // If we get a non cached IO for a cached file we should do a purge.
 346         // For now we will just promote to cached
 347         //
 348         if( NULL != pFileObject->SectionObjectPointer->DataSectionObject && !bPagingIo && bNonCachedIo)
 349         {
 350             bNonCachedIo = FALSE;
 351             bForceFlush = TRUE;
 352         }
 353
 354         if ( !bNonCachedIo && !bPagingIo)
 355         {
 356
 357             if( pFileObject->PrivateCacheMap == NULL)
 358             {
 359
 360                 AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING|AFS_SUBSYSTEM_SECTION_OBJECT,
 361                               AFS_TRACE_LEVEL_VERBOSE,
 362                               "AFSCommonWrite Acquiring Fcb SectionObject lock %p EXCL %08lX\n",
 363                               &pNPFcb->SectionObjectResource,
 364                               PsGetCurrentThread()));
 365
 366                 AFSAcquireExcl( &pNPFcb->SectionObjectResource,
 367                                 TRUE);
 368
 369                 bReleaseSectionObject = TRUE;
 370
 371                 __try
 372                 {
 373
 374                     AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 375                                   AFS_TRACE_LEVEL_VERBOSE,
 376                                   "AFSCommonWrite Initialize caching on Fcb %p FileObject %p\n",
 377                                   pFcb,
 378                                   pFileObject));
 379
 380                     CcInitializeCacheMap( pFileObject,
 381                                           (PCC_FILE_SIZES)&pFcb->Header.AllocationSize,
 382                                           FALSE,
 383                                           AFSLibCacheManagerCallbacks,
 384                                           pFcb);
 385
 386                     CcSetReadAheadGranularity( pFileObject,
 387                                                pDeviceExt->Specific.RDR.MaximumRPCLength);
 388
 389                     CcSetDirtyPageThreshold( pFileObject,
 390                                              AFS_DIRTY_CHUNK_THRESHOLD * pDeviceExt->Specific.RDR.MaximumRPCLength / 4096);
 391                 }
 392                 __except( EXCEPTION_EXECUTE_HANDLER)
 393                 {
 394
 395                     ntStatus = GetExceptionCode();
 396
 397                     AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 398                                   AFS_TRACE_LEVEL_ERROR,
 399                                   "AFSCommonWrite (%p) Exception thrown while initializing cache map Status %08lX\n",
 400                                   Irp,
 401                                   ntStatus));
 402                 }
 403
 404                 AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING|AFS_SUBSYSTEM_SECTION_OBJECT,
 405                               AFS_TRACE_LEVEL_VERBOSE,
 406                               "AFSCommonWrite Releasing Fcb SectionObject lock %p EXCL %08lX\n",
 407                               &pNPFcb->SectionObjectResource,
 408                               PsGetCurrentThread()));
 409
 410                 AFSReleaseResource( &pNPFcb->SectionObjectResource);
 411
 412                 bReleaseSectionObject = FALSE;
 413
 414                 if( !NT_SUCCESS( ntStatus))
 415                 {
 416
 417                     try_return( ntStatus);
 418                 }
 419             }
 420
 421             //
 422             // On versions of Microsoft Windows older than Vista the IO Manager
 423             // will issue multiple outstanding writes on a synchronous file object
 424             // if one of the cached writes completes with STATUS_PENDING.  This can
 425             // result in the writes being completed out of order which can corrupt
 426             // the end of file marker.  On OS versions older than Vista use a spin
 427             // loop instead of deferring the write.
 428             //
 429
 430             if ( bSynchronousFo &&
 431                  AFSRtlSysVersion.dwMajorVersion < 6)
 432             {
 433
 434                 while (!CcCanIWrite( pFileObject,
 435                                      ulByteCount,
 436                                      bWait && !bRetry,
 437                                      bRetry))
 438                 {
 439                     static const LONGLONG llWriteDelay = (LONGLONG)-100000;
 440                     bRetry = TRUE;
 441
 442                     AFSDbgLogMsg( AFS_SUBSYSTEM_IO_PROCESSING,
 443                                   AFS_TRACE_LEVEL_WARNING,
 444                                   "AFSCommonWrite (FO: %p) CcCanIWrite says No room for %u bytes! Retry in 10ms\n",
 445                                   pFileObject,
 446                                   ulByteCount);
 447
 448                     KeDelayExecutionThread(KernelMode, FALSE, (PLARGE_INTEGER)&llWriteDelay);
 449                 }
 450             }
 451             else
 452             {
 453
 454                 if (!CcCanIWrite( pFileObject,
 455                                   ulByteCount,
 456                                   bWait && !bRetry,
 457                                   bRetry))
 458                 {
 459
 460                     AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 461                                   AFS_TRACE_LEVEL_WARNING,
 462                                   "AFSCommonWrite (FO: %p) CcCanIWrite says No room for Offset %0I64X Length %08lX bytes! Deferring%s\n",
 463                                   pFileObject,
 464                                   liStartingByte.QuadPart,
 465                                   ulByteCount,
 466                                   bRetry ? " RETRY" : ""));
 467
 468                     ntStatus = AFSDeferWrite( DeviceObject, pFileObject, hCallingUser, Irp, ulByteCount, bRetry);
 469
 470                     if ( STATUS_PENDING == ntStatus)
 471                     {
 472
 473                         bCompleteIrp = FALSE;
 474                     }
 475                     else
 476                     {
 477
 478                         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 479                                       AFS_TRACE_LEVEL_ERROR,
 480                                       "AFSCommonWrite (FO: %p) AFSDeferWrite failure Status %08lX\n",
 481                                       pFileObject,
 482                                       ntStatus));
 483                     }
 484
 485                     try_return( ntStatus);
 486                 }
 487             }
 488         }
 489
 490         //
 491         // Save off the PID if this is not a paging IO
 492         //
 493
 494         if( !bPagingIo &&
 495             ( pFcb->Specific.File.ExtentRequestProcessId == 0 ||
 496               ( ullProcessId != (ULONGLONG)AFSSysProcess &&
 497                 pFcb->Specific.File.ExtentRequestProcessId != ullProcessId)))
 498         {
 499
 500             pFcb->Specific.File.ExtentRequestProcessId = ullProcessId;
 501
 502             if( ullProcessId == (ULONGLONG)AFSSysProcess)
 503             {
 504                 AFSDbgTrace(( AFS_SUBSYSTEM_EXTENT_PROCESSING,
 505                               AFS_TRACE_LEVEL_WARNING,
 506                               "%s Setting LastWriterExtentProcessId to system process for Fcb %p\n",
 507                               __FUNCTION__,
 508                               pFcb));
 509             }
 510         }
 511
 512         //
 513         // Take locks
 514         //
 515         //   - if Paging then we need to do nothing (the precalls will
 516         //     have acquired the paging resource), for clarity we will collect
 517         //     the paging resource
 518         //   - If extending Write then take the fileresource EX (EOF will change, Allocation will only move out)
 519         //   - Otherwise we collect the file shared, check against extending and
 520         //
 521
 522         bLockOK = FALSE;
 523
 524         do
 525         {
 526
 527             if( bPagingIo)
 528             {
 529
 530                 //ASSERT( NULL != OnBehalfOf || ExIsResourceAcquiredLite( &pNPFcb->Resource ));
 531
 532                 AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
 533                               AFS_TRACE_LEVEL_VERBOSE,
 534                               "AFSCommonWrite Acquiring Fcb PagingIo lock %p SHARED %08lX\n",
 535                               &pNPFcb->PagingResource,
 536                               PsGetCurrentThread()));
 537
 538                 AFSAcquireShared( &pNPFcb->PagingResource,
 539                                   TRUE);
 540
 541                 bReleasePaging = TRUE;
 542
 543                 //
 544                 // We have the correct lock - we cannot have the wrong one
 545                 //
 546                 bLockOK = TRUE;
 547             }
 548             else
 549             {
 550
 551                 bWriteToEndOfFile = liStartingByte.LowPart == FILE_WRITE_TO_END_OF_FILE &&
 552                                     liStartingByte.HighPart == -1;
 553
 554                 bExtendingWrite = ( bWriteToEndOfFile ||
 555                                     ((liStartingByte.QuadPart + ulByteCount) >=
 556                                       pFcb->Header.FileSize.QuadPart));
 557
 558                 if( bExtendingWrite || bNonCachedIo)
 559                 {
 560                     //
 561                     // Check for lock inversion
 562                     //
 563
 564                     //
 565                     // For bExtendingWrite the PagingResource is needed to protect
 566                     // the CcSetFileSizes call in AFSExtendingWrite
 567                     //
 568
 569                     ASSERT( !ExIsResourceAcquiredLite( &pNPFcb->PagingResource ));
 570
 571                     AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
 572                                   AFS_TRACE_LEVEL_VERBOSE,
 573                                   "AFSCommonWrite Acquiring Fcb lock %p EXCL %08lX\n",
 574                                   &pNPFcb->Resource,
 575                                   PsGetCurrentThread()));
 576
 577                     AFSAcquireExcl( &pNPFcb->Resource,
 578                                     TRUE);
 579
 580                     bReleaseMain = TRUE;
 581
 582                     AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING|AFS_SUBSYSTEM_SECTION_OBJECT,
 583                                   AFS_TRACE_LEVEL_VERBOSE,
 584                                   "AFSCommonWrite Acquiring Fcb SectionObject lock %p EXCL %08lX\n",
 585                                   &pNPFcb->SectionObjectResource,
 586                                   PsGetCurrentThread()));
 587
 588                     AFSAcquireExcl( &pNPFcb->SectionObjectResource,
 589                                     TRUE);
 590
 591                     bReleaseSectionObject = TRUE;
 592
 593                     if ( bWriteToEndOfFile)
 594                     {
 595
 596                         if (pFcb->Header.ValidDataLength.QuadPart > pFcb->Header.FileSize.QuadPart)
 597                         {
 598
 599                             liStartingByte = pFcb->Header.ValidDataLength;
 600                         }
 601                         else
 602                         {
 603
 604                             liStartingByte = pFcb->Header.FileSize;
 605                         }
 606
 607                         pIrpSp->Parameters.Write.ByteOffset = liStartingByte;
 608                     }
 609
 610                     //
 611                     // We have the correct lock - even if we don't end up truncating
 612                     //
 613                     bLockOK = TRUE;
 614                 }
 615                 else
 616                 {
 617                     ASSERT( !ExIsResourceAcquiredLite( &pNPFcb->PagingResource ));
 618
 619                     AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
 620                                   AFS_TRACE_LEVEL_VERBOSE,
 621                                   "AFSCommonWrite Acquiring Fcb lock %p SHARED %08lX\n",
 622                                   &pNPFcb->Resource,
 623                                   PsGetCurrentThread()));
 624
 625                     AFSAcquireShared( &pNPFcb->Resource,
 626                                       TRUE);
 627
 628                     bReleaseMain = TRUE;
 629
 630                     AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING|AFS_SUBSYSTEM_SECTION_OBJECT,
 631                                   AFS_TRACE_LEVEL_VERBOSE,
 632                                   "AFSCommonWrite Acquiring Fcb SectionObject lock %p SHARED %08lX\n",
 633                                   &pNPFcb->SectionObjectResource,
 634                                   PsGetCurrentThread()));
 635
 636                     AFSAcquireShared( &pNPFcb->SectionObjectResource,
 637                                       TRUE);
 638
 639                     bReleaseSectionObject = TRUE;
 640
 641                     //
 642                     // Have things moved?  Are we extending? If so, the the lock isn't OK
 643                     //
 644                     bLockOK = (liStartingByte.QuadPart + ulByteCount) < pFcb->Header.FileSize.QuadPart;
 645
 646                     if (!bLockOK)
 647                     {
 648
 649                         AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING|AFS_SUBSYSTEM_SECTION_OBJECT,
 650                                       AFS_TRACE_LEVEL_VERBOSE,
 651                                       "AFSCommonWrite Releasing Fcb SectionObject lock %p SHARED %08lX\n",
 652                                       &pNPFcb->SectionObjectResource,
 653                                       PsGetCurrentThread()));
 654
 655                         AFSReleaseResource( &pNPFcb->SectionObjectResource);
 656
 657                         bReleaseSectionObject = FALSE;
 658
 659                         AFSReleaseResource( &pNPFcb->Resource);
 660
 661                         bReleaseMain = FALSE;
 662                     }
 663                 }
 664             }
 665         }
 666         while (!bLockOK);
 667
 668         if( !bPagingIo)
 669         {
 670
 671             //
 672             // Check the BR locks on the file.
 673             //
 674
 675             if ( !FsRtlCheckLockForWriteAccess( &pFcb->Specific.File.FileLock,
 676                                                 Irp))
 677             {
 678
 679                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 680                               AFS_TRACE_LEVEL_ERROR,
 681                               "AFSCommonWrite (%p) Request failed due to lock conflict\n",
 682                               Irp));
 683
 684                 try_return( ntStatus = STATUS_FILE_LOCK_CONFLICT);
 685             }
 686
 687             if( bExtendingWrite)
 688             {
 689
 690                 ntStatus = AFSExtendingWrite( pFcb, pFileObject, (liStartingByte.QuadPart + ulByteCount));
 691
 692                 //
 693                 // Fcb->NPFcb->Resource is now held SHARED
 694                 //
 695
 696                 if( !NT_SUCCESS(ntStatus))
 697                 {
 698
 699                     AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 700                                   AFS_TRACE_LEVEL_ERROR,
 701                                   "AFSCommonWrite (%p) Failed extending write request Status %08lX\n",
 702                                   Irp,
 703                                   ntStatus));
 704
 705                     try_return( ntStatus );
 706                 }
 707             }
 708         }
 709
 710         //
 711         // Fire off the request as appropriate
 712         //
 713         bCompleteIrp = FALSE;
 714
 715         if( !bPagingIo &&
 716             !bNonCachedIo)
 717         {
 718
 719             //
 720             // Main resource held Shared
 721             // SectionObject resource held exclusive if extending write
 722             //
 723
 724             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 725                           AFS_TRACE_LEVEL_VERBOSE,
 726                           "AFSCommonWrite (%p) Processing CACHED request Offset %0I64X Len %08lX%s\n",
 727                           Irp,
 728                           liStartingByte.QuadPart,
 729                           ulByteCount,
 730                           bRetry ? " RETRY" : ""));
 731
 732             ntStatus = AFSCachedWrite( DeviceObject, Irp, liStartingByte, ulByteCount, bForceFlush);
 733         }
 734         else
 735         {
 736
 737             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 738                           AFS_TRACE_LEVEL_VERBOSE,
 739                           "AFSCommonWrite (%p) Processing NON-CACHED request Offset %0I64X Len %08lX%s\n",
 740                           Irp,
 741                           liStartingByte.QuadPart,
 742                           ulByteCount,
 743                           bRetry ? " RETRY" : ""));
 744
 745             if( BooleanFlagOn( pRDRDevExt->DeviceFlags, AFS_DEVICE_FLAG_DIRECT_SERVICE_IO))
 746             {
 747
 748                 ntStatus = AFSNonCachedWriteDirect( DeviceObject, Irp,  liStartingByte, ulByteCount);
 749             }
 750             else
 751             {
 752                 ntStatus = AFSNonCachedWrite( DeviceObject, Irp,  liStartingByte, ulByteCount);
 753             }
 754         }
 755
 756 try_exit:
 757
 758         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 759                       AFS_TRACE_LEVEL_VERBOSE,
 760                       "AFSCommonWrite (%p) Process complete Status %08lX\n",
 761                       Irp,
 762                       ntStatus));
 763
 764         if ( NT_SUCCESS( ntStatus) &&
 765              ntStatus != STATUS_PENDING)
 766         {
 767             if ( !bPagingIo)
 768             {
 769
 770                 if( bSynchronousFo)
 771                 {
 772
 773                     pFileObject->CurrentByteOffset.QuadPart = liStartingByte.QuadPart + ulByteCount;
 774                 }
 775
 776                 //
 777                 // If this extended the VDL, then update it accordingly.
 778                 // Increasing the VDL does not require a call to CcSetFileSizes.
 779                 //
 780
 781                 if( liStartingByte.QuadPart + ulByteCount > pFcb->Header.ValidDataLength.QuadPart)
 782                 {
 783
 784                     pFcb->Header.ValidDataLength.QuadPart = liStartingByte.QuadPart + ulByteCount;
 785                 }
 786
 787                 //
 788                 // Register the File Object as having modified the file.
 789                 //
 790                 SetFlag( pFileObject->Flags, FO_FILE_MODIFIED);
 791             }
 792         }
 793
 794         if ( ntStatus != STATUS_PENDING &&
 795              !bPagingIo && bNonCachedIo && CcIsFileCached( pFileObject) &&
 796              pNPFcb->SectionObjectPointers.DataSectionObject != NULL &&
 797              bReleaseSectionObject)
 798         {
 799             //
 800             // Regardless of whether or not the a non-paging non-cached write
 801             // succeeds or fails, if the file is cached the contents of the
 802             // cache are no longer up to date.  A CcPurgeCacheSection must be
 803             // performed to force subsequent cached reads to obtain the data
 804             // from the service.
 805             //
 806             // The Fcb Resource is dropped in order to permit filters that perform
 807             // an open via a worker thread in response to a purge to do so without
 808             // deadlocking.  The SectionObjectResource is held across the purge to
 809             // prevent racing with other cache operations.
 810             //
 811
 812             if( bReleaseMain)
 813             {
 814
 815                 AFSReleaseResource( &pNPFcb->Resource);
 816
 817                 bReleaseMain = FALSE;
 818             }
 819
 820             __try
 821             {
 822
 823                 if ( !CcPurgeCacheSection( &pNPFcb->SectionObjectPointers,
 824                                            &liStartingByte,
 825                                            ulByteCount,
 826                                            FALSE))
 827                 {
 828
 829                     AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 830                                   AFS_TRACE_LEVEL_WARNING,
 831                                   "AFSCommonWrite CcPurgeCacheSection failure FID %08lX-%08lX-%08lX-%08lX\n",
 832                                   pFcb->ObjectInformation->FileId.Cell,
 833                                   pFcb->ObjectInformation->FileId.Volume,
 834                                   pFcb->ObjectInformation->FileId.Vnode,
 835                                   pFcb->ObjectInformation->FileId.Unique));
 836
 837                     SetFlag( pFcb->Flags, AFS_FCB_FLAG_PURGE_ON_CLOSE);
 838                 }
 839             }
 840             __except( EXCEPTION_EXECUTE_HANDLER)
 841             {
 842
 843                 DWORD ntStatus2 = GetExceptionCode();
 844
 845                 AFSDbgTrace(( 0,
 846                               0,
 847                               "EXCEPTION - AFSCommonWrite CcPurgeCacheSection failed FID %08lX-%08lX-%08lX-%08lX Status 0x%08lX\n",
 848                               pFcb->ObjectInformation->FileId.Cell,
 849                               pFcb->ObjectInformation->FileId.Volume,
 850                               pFcb->ObjectInformation->FileId.Vnode,
 851                               pFcb->ObjectInformation->FileId.Unique,
 852                               ntStatus2));
 853
 854                 SetFlag( pFcb->Flags, AFS_FCB_FLAG_PURGE_ON_CLOSE);
 855             }
 856         }
 857
 858         ObDereferenceObject(pFileObject);
 859
 860         if( bReleaseSectionObject)
 861         {
 862
 863             AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING|AFS_SUBSYSTEM_SECTION_OBJECT,
 864                           AFS_TRACE_LEVEL_VERBOSE,
 865                           "AFSCommonWrite Releasing Fcb SectionObject lock %p EXCL/SHARED %08lX\n",
 866                           &pNPFcb->SectionObjectResource,
 867                           PsGetCurrentThread()));
 868
 869             AFSReleaseResource( &pNPFcb->SectionObjectResource);
 870         }
 871
 872         if( bReleasePaging)
 873         {
 874
 875             AFSReleaseResource( &pNPFcb->PagingResource);
 876         }
 877
 878         if( bReleaseMain)
 879         {
 880
 881             AFSReleaseResource( &pNPFcb->Resource);
 882         }
 883
 884         if( bCompleteIrp)
 885         {
 886
 887             AFSCompleteRequest( Irp,
 888                                 ntStatus);
 889         }
 890     }
 891
 892     return ntStatus;
 893 }
 894
 895 NTSTATUS
 896 AFSIOCtlWrite( IN PDEVICE_OBJECT DeviceObject,
 897                IN PIRP Irp)
 898 {
 899
 900     UNREFERENCED_PARAMETER(DeviceObject);
 901     NTSTATUS ntStatus = STATUS_SUCCESS;
 902     AFSPIOCtlIORequestCB stIORequestCB;
 903     PIO_STACK_LOCATION pIrpSp = IoGetCurrentIrpStackLocation( Irp);
 904     AFSFcb *pFcb = NULL;
 905     AFSCcb *pCcb = NULL;
 906     AFSPIOCtlIOResultCB stIOResultCB;
 907     ULONG ulBytesReturned = 0;
 908     AFSFileID stParentFID;
 909
 910     __Enter
 911     {
 912
 913         Irp->IoStatus.Information = 0;
 914
 915         RtlZeroMemory( &stIORequestCB,
 916                        sizeof( AFSPIOCtlIORequestCB));
 917
 918         if( pIrpSp->Parameters.Write.Length == 0)
 919         {
 920
 921             //
 922             // Nothing to do in this case
 923             //
 924
 925             try_return( ntStatus);
 926         }
 927
 928         pFcb = (AFSFcb *)pIrpSp->FileObject->FsContext;
 929
 930         pCcb = (AFSCcb *)pIrpSp->FileObject->FsContext2;
 931
 932         AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
 933                       AFS_TRACE_LEVEL_VERBOSE,
 934                       "AFSIOCtlWrite Acquiring Fcb lock %p SHARED %08lX\n",
 935                       &pFcb->NPFcb->Resource,
 936                       PsGetCurrentThread()));
 937
 938         AFSAcquireShared( &pFcb->NPFcb->Resource,
 939                           TRUE);
 940
 941         //
 942         // Get the parent fid to pass to the cm
 943         //
 944
 945         RtlZeroMemory( &stParentFID,
 946                        sizeof( AFSFileID));
 947
 948         if( BooleanFlagOn( pFcb->ObjectInformation->Flags, AFS_OBJECT_FLAGS_PARENT_FID))
 949         {
 950
 951             //
 952             // The parent directory FID of the node
 953             //
 954
 955             stParentFID = pFcb->ObjectInformation->ParentFileId;
 956         }
 957
 958         //
 959         // Set the control block up
 960         //
 961
 962         stIORequestCB.RequestId = pCcb->RequestID;
 963
 964         if( pFcb->ObjectInformation->VolumeCB != NULL)
 965         {
 966             stIORequestCB.RootId = pFcb->ObjectInformation->VolumeCB->ObjectInformation.FileId;
 967         }
 968
 969         //
 970         // Lock down the buffer
 971         //
 972
 973         stIORequestCB.MappedBuffer = AFSMapToService( Irp,
 974                                                       pIrpSp->Parameters.Write.Length);
 975
 976         if( stIORequestCB.MappedBuffer == NULL)
 977         {
 978
 979             try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES);
 980         }
 981
 982         stIORequestCB.BufferLength = pIrpSp->Parameters.Write.Length;
 983
 984         stIOResultCB.BytesProcessed = 0;
 985
 986         ulBytesReturned = sizeof( AFSPIOCtlIOResultCB);
 987
 988         //
 989         // Issue the request to the service
 990         //
 991
 992         ntStatus = AFSProcessRequest( AFS_REQUEST_TYPE_PIOCTL_WRITE,
 993                                       AFS_REQUEST_FLAG_SYNCHRONOUS,
 994                                       &pCcb->AuthGroup,
 995                                       NULL,
 996                                       &stParentFID,
 997                                       NULL,
 998                                       0,
 999                                       (void *)&stIORequestCB,
1000                                       sizeof( AFSPIOCtlIORequestCB),
1001                                       &stIOResultCB,
1002                                       &ulBytesReturned);
1003
1004         if( !NT_SUCCESS( ntStatus))
1005         {
1006
1007             try_return( ntStatus);
1008         }
1009
1010         //
1011         // Update the length written
1012         //
1013
1014         Irp->IoStatus.Information = stIOResultCB.BytesProcessed;
1015
1016 try_exit:
1017
1018         if( stIORequestCB.MappedBuffer != NULL)
1019         {
1020
1021             AFSUnmapServiceMappedBuffer( stIORequestCB.MappedBuffer,
1022                                          Irp->MdlAddress);
1023         }
1024
1025         if( pFcb != NULL)
1026         {
1027
1028             AFSReleaseResource( &pFcb->NPFcb->Resource);
1029         }
1030     }
1031
1032     return ntStatus;
1033 }
1034
1035 //
1036 // This function is called when we know we have to read from the AFS Cache.
1037 //
1038 // It ensures that we have exents for the entirety of the write and
1039 // then pins the extents into memory (meaning that although we may
1040 // add we will not remove).  Then it creates a scatter gather write
1041 // and fires off the IRPs
1042 //
1043 static
1044 NTSTATUS
1045 AFSNonCachedWrite( IN PDEVICE_OBJECT DeviceObject,
1046                    IN PIRP Irp,
1047                    IN LARGE_INTEGER StartingByte,
1048                    IN ULONG ByteCount)
1049 {
1050     NTSTATUS           ntStatus = STATUS_UNSUCCESSFUL;
1051     VOID              *pSystemBuffer = NULL;
1052     BOOLEAN            bPagingIo = BooleanFlagOn( Irp->Flags, IRP_PAGING_IO);
1053     BOOLEAN            bLocked = FALSE;
1054     BOOLEAN            bCompleteIrp = TRUE;
1055     AFSGatherIo       *pGatherIo = NULL;
1056     AFSIoRun          *pIoRuns = NULL;
1057     AFSIoRun           stIoRuns[AFS_MAX_STACK_IO_RUNS];
1058     ULONG              extentsCount = 0, runCount = 0;
1059     AFSExtent         *pStartExtent = NULL;
1060     AFSExtent         *pIgnoreExtent = NULL;
1061     IO_STACK_LOCATION *pIrpSp = IoGetCurrentIrpStackLocation( Irp);
1062     PFILE_OBJECT       pFileObject = pIrpSp->FileObject;
1063     AFSFcb            *pFcb = (AFSFcb *)pFileObject->FsContext;
1064     AFSCcb            *pCcb = (AFSCcb *)pFileObject->FsContext2;
1065     BOOLEAN            bSynchronousFo = BooleanFlagOn( pFileObject->Flags, FO_SYNCHRONOUS_IO);
1066     AFSDeviceExt      *pDevExt = (AFSDeviceExt *)DeviceObject->DeviceExtension;
1067     LARGE_INTEGER      liCurrentTime, liLastRequestTime;
1068     AFSDeviceExt      *pControlDevExt = (AFSDeviceExt *)AFSControlDeviceObject->DeviceExtension;
1069     PFILE_OBJECT       pCacheFileObject = NULL;
1070     BOOLEAN            bDerefExtents = FALSE;
1071
1072     __Enter
1073     {
1074
1075         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1076                       AFS_TRACE_LEVEL_VERBOSE,
1077                       "AFSNonCachedWrite (FO: %p) StartingByte %08lX:%08lX Length %08lX\n",
1078                       pFileObject,
1079                       StartingByte.HighPart,
1080                       StartingByte.LowPart,
1081                       ByteCount));
1082
1083         if (ByteCount > pDevExt->Specific.RDR.MaxIo.QuadPart)
1084         {
1085
1086             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1087                           AFS_TRACE_LEVEL_ERROR,
1088                           "AFSNonCachedWrite (%p) Request %08lX Actual %08lX larger than MaxIO %I64X\n",
1089                           Irp,
1090                           ByteCount,
1091                           pIrpSp->Parameters.Write.Length,
1092                           pDevExt->Specific.RDR.MaxIo.QuadPart));
1093
1094             try_return( ntStatus = STATUS_UNSUCCESSFUL);
1095         }
1096
1097         //
1098         // Get the mapping for the buffer
1099         //
1100         pSystemBuffer = AFSLockSystemBuffer( Irp,
1101                                              ByteCount);
1102
1103         if( pSystemBuffer == NULL)
1104         {
1105
1106             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1107                           AFS_TRACE_LEVEL_ERROR,
1108                           "AFSNonCachedWrite (%p) Failed to map system buffer\n",
1109                           Irp));
1110
1111             try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES);
1112         }
1113
1114
1115         //
1116         // Provoke a get of the extents - if we need to.
1117         //
1118
1119         AFSDbgTrace(( AFS_SUBSYSTEM_EXTENT_PROCESSING,
1120                       AFS_TRACE_LEVEL_VERBOSE,
1121                       "AFSNonCachedWrite Requesting extents for fid %08lX-%08lX-%08lX-%08lX Offset %0I64X Length %08lX\n",
1122                       pFcb->ObjectInformation->FileId.Cell,
1123                       pFcb->ObjectInformation->FileId.Volume,
1124                       pFcb->ObjectInformation->FileId.Vnode,
1125                       pFcb->ObjectInformation->FileId.Unique,
1126                       StartingByte.QuadPart,
1127                       ByteCount));
1128
1129         ntStatus = AFSRequestExtentsAsync( pFcb,
1130                                            pCcb,
1131                                            &StartingByte,
1132                                            ByteCount);
1133
1134         if (!NT_SUCCESS(ntStatus))
1135         {
1136
1137             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1138                           AFS_TRACE_LEVEL_ERROR,
1139                           "AFSNonCachedWrite (%p) Failed to request extents Status %08lX\n",
1140                           Irp,
1141                           ntStatus));
1142
1143             try_return( ntStatus);
1144         }
1145
1146         KeQueryTickCount( &liLastRequestTime);
1147
1148         while (TRUE)
1149         {
1150
1151             AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1152                           AFS_TRACE_LEVEL_VERBOSE,
1153                           "AFSNonCachedWrite Acquiring Fcb extents lock %p SHARED %08lX\n",
1154                           &pFcb->NPFcb->Specific.File.ExtentsResource,
1155                           PsGetCurrentThread()));
1156
1157             ASSERT( !ExIsResourceAcquiredLite( &pFcb->NPFcb->Specific.File.ExtentsResource ));
1158
1159             AFSAcquireShared( &pFcb->NPFcb->Specific.File.ExtentsResource, TRUE );
1160             bLocked = TRUE;
1161
1162             pStartExtent = NULL;
1163             pIgnoreExtent = NULL;
1164
1165             if ( AFSDoExtentsMapRegion( pFcb, &StartingByte, ByteCount, &pStartExtent, &pIgnoreExtent ))
1166             {
1167                 break;
1168             }
1169
1170             KeClearEvent( &pFcb->NPFcb->Specific.File.ExtentsRequestComplete );
1171
1172             AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1173                           AFS_TRACE_LEVEL_VERBOSE,
1174                           "AFSNonCachedWrite Releasing(1) Fcb extents lock %p SHARED %08lX\n",
1175                           &pFcb->NPFcb->Specific.File.ExtentsResource,
1176                           PsGetCurrentThread()));
1177
1178             AFSReleaseResource( &pFcb->NPFcb->Specific.File.ExtentsResource );
1179             bLocked= FALSE;
1180
1181             //
1182             // We will re-request the extents after waiting for them
1183             //
1184
1185             KeQueryTickCount( &liCurrentTime);
1186
1187             if( liCurrentTime.QuadPart - liLastRequestTime.QuadPart >= pControlDevExt->Specific.Control.ExtentRequestTimeCount.QuadPart)
1188             {
1189
1190                 AFSDbgTrace(( AFS_SUBSYSTEM_EXTENT_PROCESSING,
1191                               AFS_TRACE_LEVEL_VERBOSE,
1192                               "AFSNonCachedWrite Requesting extents, again, for fid %08lX-%08lX-%08lX-%08lX Offset %0I64X Length %08lX\n",
1193                               pFcb->ObjectInformation->FileId.Cell,
1194                               pFcb->ObjectInformation->FileId.Volume,
1195                               pFcb->ObjectInformation->FileId.Vnode,
1196                               pFcb->ObjectInformation->FileId.Unique,
1197                               StartingByte.QuadPart,
1198                               ByteCount));
1199
1200                 ntStatus = AFSRequestExtentsAsync( pFcb,
1201                                                    pCcb,
1202                                                    &StartingByte,
1203                                                    ByteCount);
1204
1205                 if (!NT_SUCCESS(ntStatus))
1206                 {
1207
1208                     AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1209                                   AFS_TRACE_LEVEL_ERROR,
1210                                   "AFSNonCachedWrite (%p) Failed to request extents Status %08lX\n",
1211                                   Irp,
1212                                   ntStatus));
1213
1214                     try_return( ntStatus);
1215                 }
1216
1217                 KeQueryTickCount( &liLastRequestTime);
1218             }
1219
1220
1221             AFSDbgTrace(( AFS_SUBSYSTEM_EXTENT_PROCESSING,
1222                           AFS_TRACE_LEVEL_VERBOSE,
1223                           "AFSNonCachedWrite Waiting for extents for fid %08lX-%08lX-%08lX-%08lX Offset %0I64X Length %08lX\n",
1224                           pFcb->ObjectInformation->FileId.Cell,
1225                           pFcb->ObjectInformation->FileId.Volume,
1226                           pFcb->ObjectInformation->FileId.Vnode,
1227                           pFcb->ObjectInformation->FileId.Unique,
1228                           StartingByte.QuadPart,
1229                           ByteCount));
1230
1231             //
1232             // Wait for it
1233             //
1234
1235             ntStatus =  AFSWaitForExtentMapping ( pFcb, pCcb);
1236
1237             if (!NT_SUCCESS(ntStatus))
1238             {
1239
1240                 AFSDbgTrace(( AFS_SUBSYSTEM_EXTENT_PROCESSING,
1241                               AFS_TRACE_LEVEL_ERROR,
1242                               "AFSNonCachedWrite Failed wait for extents for fid %08lX-%08lX-%08lX-%08lX Offset %0I64X Length %08lX Status %08lX\n",
1243                               pFcb->ObjectInformation->FileId.Cell,
1244                               pFcb->ObjectInformation->FileId.Volume,
1245                               pFcb->ObjectInformation->FileId.Vnode,
1246                               pFcb->ObjectInformation->FileId.Unique,
1247                               StartingByte.QuadPart,
1248                               ByteCount,
1249                               ntStatus));
1250
1251                 try_return( ntStatus);
1252             }
1253         }
1254
1255         //
1256         // As per the read path -
1257         //
1258
1259         AFSDbgTrace(( AFS_SUBSYSTEM_EXTENT_PROCESSING,
1260                       AFS_TRACE_LEVEL_VERBOSE,
1261                       "AFSNonCachedWrite Extents located for fid %08lX-%08lX-%08lX-%08lX Offset %0I64X Length %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
1269         ntStatus = AFSGetExtents( pFcb,
1270                                   &StartingByte,
1271                                   ByteCount,
1272                                   pStartExtent,
1273                                   &extentsCount,
1274                                   &runCount);
1275
1276         if (!NT_SUCCESS(ntStatus))
1277         {
1278
1279             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1280                           AFS_TRACE_LEVEL_ERROR,
1281                           "AFSNonCachedWrite (%p) Failed to retrieve mapped extents Status %08lX\n",
1282                           Irp,
1283                           ntStatus));
1284
1285             try_return( ntStatus );
1286         }
1287
1288         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1289                       AFS_TRACE_LEVEL_VERBOSE,
1290                       "AFSNonCachedWrite (%p) Successfully retrieved map extents count %d run count %d\n",
1291                       Irp,
1292                       extentsCount,
1293                       runCount));
1294
1295         if( BooleanFlagOn( AFSLibControlFlags, AFS_REDIR_LIB_FLAGS_NONPERSISTENT_CACHE))
1296         {
1297
1298             Irp->IoStatus.Information = ByteCount;
1299
1300 #if GEN_MD5
1301             //
1302             // Setup the MD5 for each extent
1303             //
1304
1305             AFSSetupMD5Hash( pFcb,
1306                              pStartExtent,
1307                              extentsCount,
1308                              pSystemBuffer,
1309                              &StartingByte,
1310                              ByteCount);
1311 #endif
1312
1313             ntStatus = AFSProcessExtentRun( pSystemBuffer,
1314                                             &StartingByte,
1315                                             ByteCount,
1316                                             pStartExtent,
1317                                             TRUE);
1318
1319             if (!NT_SUCCESS(ntStatus))
1320             {
1321
1322                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1323                               AFS_TRACE_LEVEL_ERROR,
1324                               "AFSNonCachedWrite (%p) Failed to process extent run for non-persistent cache Status %08lX\n",
1325                               Irp,
1326                               ntStatus));
1327             }
1328
1329             try_return( ntStatus);
1330         }
1331
1332         //
1333         // Retrieve the cache file object
1334         //
1335
1336         pCacheFileObject = AFSReferenceCacheFileObject();
1337
1338         if( pCacheFileObject == NULL)
1339         {
1340
1341             ntStatus = STATUS_DEVICE_NOT_READY;
1342
1343             AFSDbgTrace(( AFS_SUBSYSTEM_EXTENT_PROCESSING,
1344                           AFS_TRACE_LEVEL_ERROR,
1345                           "AFSNonCachedWrite Failed to retrieve cache fileobject for fid %08lX-%08lX-%08lX-%08lX Offset %0I64X Length %08lX Status %08lX\n",
1346                           pFcb->ObjectInformation->FileId.Cell,
1347                           pFcb->ObjectInformation->FileId.Volume,
1348                           pFcb->ObjectInformation->FileId.Vnode,
1349                           pFcb->ObjectInformation->FileId.Unique,
1350                           StartingByte.QuadPart,
1351                           ByteCount,
1352                           ntStatus));
1353
1354             try_return( ntStatus);
1355         }
1356
1357         if (runCount > AFS_MAX_STACK_IO_RUNS)
1358         {
1359
1360             pIoRuns = (AFSIoRun*) AFSExAllocatePoolWithTag( PagedPool,
1361                                                             runCount * sizeof( AFSIoRun ),
1362                                                             AFS_IO_RUN_TAG );
1363             if (NULL == pIoRuns)
1364             {
1365
1366                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1367                               AFS_TRACE_LEVEL_ERROR,
1368                               "AFSNonCachedWrite (%p) Failed to allocate IO run block\n",
1369                               Irp));
1370
1371                 try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES );
1372             }
1373         }
1374         else
1375         {
1376
1377             pIoRuns = stIoRuns;
1378         }
1379
1380         RtlZeroMemory( pIoRuns, runCount * sizeof( AFSIoRun ));
1381
1382         ntStatus = AFSSetupIoRun( IoGetRelatedDeviceObject( pCacheFileObject),
1383                                   Irp,
1384                                   pSystemBuffer,
1385                                   pIoRuns,
1386                                   &StartingByte,
1387                                   ByteCount,
1388                                   pStartExtent,
1389                                   &runCount );
1390
1391         if (!NT_SUCCESS(ntStatus))
1392         {
1393
1394             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1395                           AFS_TRACE_LEVEL_ERROR,
1396                           "AFSNonCachedWrite (%p) Failed to initialize IO run block Status %08lX\n",
1397                           Irp,
1398                           ntStatus));
1399
1400             try_return( ntStatus );
1401         }
1402
1403         AFSReferenceActiveExtents( pStartExtent,
1404                                    extentsCount);
1405
1406         bDerefExtents = TRUE;
1407
1408         AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1409                       AFS_TRACE_LEVEL_VERBOSE,
1410                       "AFSNonCachedWrite Releasing(2) Fcb extents lock %p SHARED %08lX\n",
1411                       &pFcb->NPFcb->Specific.File.ExtentsResource,
1412                       PsGetCurrentThread()));
1413
1414         AFSReleaseResource( &pFcb->NPFcb->Specific.File.ExtentsResource );
1415         bLocked = FALSE;
1416
1417         pGatherIo = (AFSGatherIo*) AFSExAllocatePoolWithTag( NonPagedPool,
1418                                                              sizeof( AFSGatherIo),
1419                                                              AFS_GATHER_TAG);
1420
1421         if (NULL == pGatherIo)
1422         {
1423
1424             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1425                           AFS_TRACE_LEVEL_ERROR,
1426                           "AFSNonCachedWrite (%p) Failed to allocate IO gather block\n",
1427                           Irp));
1428
1429             AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1430                           AFS_TRACE_LEVEL_VERBOSE,
1431                           "AFSNonCachedWrite Acquiring(1) Fcb extents lock %p SHARED %08lX\n",
1432                           &pFcb->NPFcb->Specific.File.ExtentsResource,
1433                           PsGetCurrentThread()));
1434
1435             AFSAcquireShared( &pFcb->NPFcb->Specific.File.ExtentsResource,
1436                               TRUE);
1437             bLocked = TRUE;
1438
1439             AFSDereferenceActiveExtents( pStartExtent,
1440                                          extentsCount);
1441
1442             try_return (ntStatus = STATUS_INSUFFICIENT_RESOURCES );
1443         }
1444
1445         RtlZeroMemory( pGatherIo, sizeof( AFSGatherIo ));
1446
1447         //
1448         // Initialize count to 1, that was we won't get an early
1449         // completion if the first irp completes before the second is
1450         // queued.
1451         //
1452         pGatherIo->Count = 1;
1453         pGatherIo->Status = STATUS_SUCCESS;
1454         pGatherIo->MasterIrp = Irp;
1455         pGatherIo->Synchronous = TRUE;
1456         pGatherIo->CompleteMasterIrp = FALSE;
1457
1458         bCompleteIrp = TRUE;
1459
1460         if( pGatherIo->Synchronous)
1461         {
1462             KeInitializeEvent( &pGatherIo->Event, NotificationEvent, FALSE );
1463         }
1464
1465 #if GEN_MD5
1466         //
1467         // Setup the MD5 for each extent
1468         //
1469
1470         AFSSetupMD5Hash( pFcb,
1471                          pStartExtent,
1472                          extentsCount,
1473                          pSystemBuffer,
1474                          &StartingByte,
1475                          ByteCount);
1476 #endif
1477
1478         //
1479         // Pre-emptively set up the count
1480         //
1481
1482         Irp->IoStatus.Information = ByteCount;
1483
1484         ntStatus = AFSQueueStartIos( pCacheFileObject,
1485                                      IRP_MJ_WRITE,
1486                                      IRP_WRITE_OPERATION | IRP_SYNCHRONOUS_API,
1487                                      pIoRuns,
1488                                      runCount,
1489                                      pGatherIo);
1490
1491         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1492                       AFS_TRACE_LEVEL_VERBOSE,
1493                       "AFSNonCachedWrite (%p) AFSStartIos completed Status %08lX\n",
1494                       Irp,
1495                       ntStatus));
1496
1497         if( !NT_SUCCESS( ntStatus))
1498         {
1499
1500             AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1501                           AFS_TRACE_LEVEL_VERBOSE,
1502                           "AFSNonCachedWrite Acquiring(2) Fcb extents lock %p SHARED %08lX\n",
1503                           &pFcb->NPFcb->Specific.File.ExtentsResource,
1504                           PsGetCurrentThread()));
1505
1506             AFSAcquireShared( &pFcb->NPFcb->Specific.File.ExtentsResource,
1507                               TRUE);
1508             bLocked = TRUE;
1509
1510             AFSDereferenceActiveExtents( pStartExtent,
1511                                          extentsCount);
1512
1513             try_return( ntStatus);
1514         }
1515
1516         //
1517         // Wait for completion of All IOs we started.
1518         //
1519
1520         ntStatus = KeWaitForSingleObject( &pGatherIo->Event,
1521                                           Executive,
1522                                           KernelMode,
1523                                           FALSE,
1524                                           NULL);
1525
1526         if( NT_SUCCESS( ntStatus))
1527         {
1528
1529             ntStatus = pGatherIo->Status;
1530         }
1531
1532         if( !NT_SUCCESS( ntStatus))
1533         {
1534
1535             AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1536                           AFS_TRACE_LEVEL_VERBOSE,
1537                           "AFSNonCachedWrite Acquiring(3) Fcb extents lock %p SHARED %08lX\n",
1538                           &pFcb->NPFcb->Specific.File.ExtentsResource,
1539                           PsGetCurrentThread()));
1540
1541             AFSAcquireShared( &pFcb->NPFcb->Specific.File.ExtentsResource,
1542                               TRUE);
1543             bLocked = TRUE;
1544
1545             AFSDereferenceActiveExtents( pStartExtent,
1546                                          extentsCount);
1547
1548             try_return( ntStatus);
1549         }
1550
1551 try_exit:
1552
1553         if( NT_SUCCESS( ntStatus) &&
1554             pStartExtent != NULL &&
1555             Irp->IoStatus.Information > 0)
1556         {
1557
1558             if ( !bLocked)
1559             {
1560
1561                 AFSAcquireShared( &pFcb->NPFcb->Specific.File.ExtentsResource,
1562                                   TRUE);
1563                 bLocked = TRUE;
1564             }
1565
1566             //
1567             // Since this is dirty we can mark the extents dirty now.
1568             // AFSMarkDirty will dereference the extents.  Do not call
1569             // AFSDereferenceActiveExtents() in this code path.
1570             //
1571
1572             AFSMarkDirty( pFcb,
1573                           pStartExtent,
1574                           extentsCount,
1575                           &StartingByte,
1576                           bDerefExtents);
1577
1578             if (!bPagingIo)
1579             {
1580                 //
1581                 // This was an uncached user write - tell the server to do
1582                 // the flush when the worker thread next wakes up
1583                 //
1584                 pFcb->Specific.File.LastServerFlush.QuadPart = 0;
1585             }
1586         }
1587
1588         if( pCacheFileObject != NULL)
1589         {
1590             AFSReleaseCacheFileObject( pCacheFileObject);
1591         }
1592
1593         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1594                       AFS_TRACE_LEVEL_VERBOSE,
1595                       "AFSNonCachedWrite (FO: %p) StartingByte %08lX:%08lX Length %08lX Status %08lX\n",
1596                       pFileObject,
1597                       StartingByte.HighPart,
1598                       StartingByte.LowPart,
1599                       ByteCount,
1600                       ntStatus));
1601
1602         if (NT_SUCCESS(ntStatus) &&
1603             !bPagingIo &&
1604             bSynchronousFo)
1605         {
1606
1607             pFileObject->CurrentByteOffset.QuadPart = StartingByte.QuadPart + ByteCount;
1608         }
1609
1610         if( bLocked)
1611         {
1612
1613             AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1614                           AFS_TRACE_LEVEL_VERBOSE,
1615                           "AFSNonCachedWrite Releasing Fcb extents lock %p SHARED %08lX\n",
1616                           &pFcb->NPFcb->Specific.File.ExtentsResource,
1617                           PsGetCurrentThread()));
1618
1619             AFSReleaseResource( &pFcb->NPFcb->Specific.File.ExtentsResource );
1620         }
1621
1622         if( pGatherIo)
1623         {
1624             AFSExFreePoolWithTag(pGatherIo, AFS_GATHER_TAG);
1625         }
1626
1627         if( NULL != pIoRuns &&
1628             stIoRuns != pIoRuns)
1629         {
1630             AFSExFreePoolWithTag(pIoRuns, AFS_IO_RUN_TAG);
1631         }
1632
1633         if( bCompleteIrp)
1634         {
1635
1636             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1637                           AFS_TRACE_LEVEL_VERBOSE,
1638                           "AFSNonCachedWrite Completing Irp %p Status %08lX Info %08lX\n",
1639                           Irp,
1640                           ntStatus,
1641                           Irp->IoStatus.Information));
1642
1643             AFSCompleteRequest( Irp, ntStatus);
1644         }
1645     }
1646
1647     return ntStatus;
1648 }
1649
1650 static
1651 NTSTATUS
1652 AFSNonCachedWriteDirect( IN PDEVICE_OBJECT DeviceObject,
1653                          IN PIRP Irp,
1654                          IN LARGE_INTEGER StartingByte,
1655                          IN ULONG ByteCount)
1656 {
1657     NTSTATUS           ntStatus = STATUS_UNSUCCESSFUL;
1658     VOID              *pSystemBuffer = NULL;
1659     BOOLEAN            bPagingIo = BooleanFlagOn( Irp->Flags, IRP_PAGING_IO);
1660     IO_STACK_LOCATION *pIrpSp = IoGetCurrentIrpStackLocation( Irp);
1661     PFILE_OBJECT       pFileObject = pIrpSp->FileObject;
1662     AFSFcb            *pFcb = (AFSFcb *)pFileObject->FsContext;
1663     AFSCcb            *pCcb = (AFSCcb *)pFileObject->FsContext2;
1664     BOOLEAN            bSynchronousFo = BooleanFlagOn( pFileObject->Flags, FO_SYNCHRONOUS_IO);
1665     BOOLEAN            bNoIntermediateBuffering = BooleanFlagOn( pFileObject->Flags, FO_NO_INTERMEDIATE_BUFFERING);
1666     AFSDeviceExt      *pDevExt = (AFSDeviceExt *)DeviceObject->DeviceExtension;
1667     AFSFileIOCB        stFileIORequest;
1668     AFSFileIOResultCB  stFileIOResult;
1669     ULONG              ulResultLen = 0;
1670     ULONG              ulFlags;
1671
1672     __Enter
1673     {
1674         Irp->IoStatus.Information = 0;
1675
1676         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1677                       AFS_TRACE_LEVEL_VERBOSE,
1678                       "AFSNonCachedWriteDirect (FO: %p) StartingByte %08lX:%08lX Length %08lX\n",
1679                       pFileObject,
1680                       StartingByte.HighPart,
1681                       StartingByte.LowPart,
1682                       ByteCount));
1683
1684         if (ByteCount > pDevExt->Specific.RDR.MaxIo.QuadPart)
1685         {
1686
1687             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1688                           AFS_TRACE_LEVEL_ERROR,
1689                           "AFSNonCachedWriteDirect (%p) Request %08lX Actual %08lX larger than MaxIO %I64X\n",
1690                           Irp,
1691                           ByteCount,
1692                           pIrpSp->Parameters.Write.Length,
1693                           pDevExt->Specific.RDR.MaxIo.QuadPart));
1694
1695             try_return( ntStatus = STATUS_UNSUCCESSFUL);
1696         }
1697
1698         //
1699         // Get the mapping for the buffer
1700         //
1701         pSystemBuffer = AFSLockSystemBuffer( Irp,
1702                                              ByteCount);
1703
1704         if( pSystemBuffer == NULL)
1705         {
1706
1707             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1708                           AFS_TRACE_LEVEL_ERROR,
1709                           "AFSNonCachedWriteDirect (%p) Failed to map system buffer\n",
1710                           Irp));
1711
1712             try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES);
1713         }
1714
1715         //
1716         // Issue the request at the service for processing
1717         //
1718
1719         ulResultLen = sizeof( AFSFileIOResultCB);
1720
1721         RtlZeroMemory( &stFileIORequest,
1722                        sizeof( AFSFileIOCB));
1723
1724         RtlZeroMemory( &stFileIOResult,
1725                        sizeof( AFSFileIOResultCB));
1726
1727         stFileIORequest.SystemIOBuffer = pSystemBuffer;
1728
1729         stFileIORequest.SystemIOBufferMdl = Irp->MdlAddress;
1730
1731         stFileIORequest.IOLength = ByteCount;
1732
1733         stFileIORequest.IOOffset = StartingByte;
1734
1735         ulFlags = AFS_REQUEST_FLAG_SYNCHRONOUS;
1736
1737         if ( bNoIntermediateBuffering)
1738         {
1739
1740             ulFlags |= AFS_REQUEST_FLAG_CACHE_BYPASS;
1741         }
1742
1743         //
1744         // Update file metadata
1745         //
1746
1747         stFileIORequest.EndOfFile = pFcb->ObjectInformation->EndOfFile;
1748
1749         stFileIORequest.CreateTime = pFcb->ObjectInformation->CreationTime;
1750
1751         stFileIORequest.ChangeTime = pFcb->ObjectInformation->ChangeTime;
1752
1753         stFileIORequest.LastAccessTime = pFcb->ObjectInformation->LastAccessTime;
1754
1755         stFileIORequest.LastWriteTime = pFcb->ObjectInformation->LastWriteTime;
1756
1757         //
1758         // Write the data to the service
1759         //
1760
1761         ntStatus = AFSProcessRequest( AFS_REQUEST_TYPE_PROCESS_WRITE_FILE,
1762                                       ulFlags,
1763                                       &pCcb->AuthGroup,
1764                                       &pCcb->DirectoryCB->NameInformation.FileName,
1765                                       &pFcb->ObjectInformation->FileId,
1766                                       pFcb->ObjectInformation->VolumeCB->VolumeInformation.Cell,
1767                                       pFcb->ObjectInformation->VolumeCB->VolumeInformation.CellLength,
1768                                       &stFileIORequest,
1769                                       sizeof( AFSFileIOCB),
1770                                       &stFileIOResult,
1771                                       &ulResultLen);
1772
1773         if( NT_SUCCESS( ntStatus))
1774         {
1775
1776             Irp->IoStatus.Information = (ULONG_PTR)stFileIOResult.Length;
1777         }
1778         else
1779         {
1780
1781             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1782                           AFS_TRACE_LEVEL_ERROR,
1783                           "AFSNonCachedWriteDirect (%p) Failed to send write to service Status %08lX\n",
1784                           Irp,
1785                           ntStatus));
1786         }
1787
1788 try_exit:
1789
1790         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1791                       AFS_TRACE_LEVEL_VERBOSE,
1792                       "AFSNonCachedWriteDirect (FO: %p) StartingByte %08lX:%08lX Length %08lX Status %08lX\n",
1793                       pFileObject,
1794                       StartingByte.HighPart,
1795                       StartingByte.LowPart,
1796                       ByteCount,
1797                       ntStatus));
1798
1799         if (NT_SUCCESS(ntStatus) &&
1800             !bPagingIo &&
1801             bSynchronousFo)
1802         {
1803
1804             pFileObject->CurrentByteOffset.QuadPart = StartingByte.QuadPart + ByteCount;
1805         }
1806
1807         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1808                       AFS_TRACE_LEVEL_VERBOSE,
1809                       "AFSNonCachedWriteDirect Completing Irp %p Status %08lX Info %08lX\n",
1810                       Irp,
1811                       ntStatus,
1812                       Irp->IoStatus.Information));
1813
1814         AFSCompleteRequest( Irp, ntStatus);
1815     }
1816
1817     return ntStatus;
1818 }
1819
1820 static
1821 NTSTATUS
1822 AFSCachedWrite( IN PDEVICE_OBJECT DeviceObject,
1823                 IN PIRP Irp,
1824                 IN LARGE_INTEGER StartingByte,
1825                 IN ULONG ByteCount,
1826                 IN BOOLEAN ForceFlush)
1827 {
1828     UNREFERENCED_PARAMETER(DeviceObject);
1829     PVOID              pSystemBuffer = NULL;
1830     NTSTATUS           ntStatus = STATUS_SUCCESS;
1831     IO_STATUS_BLOCK    iosbFlush;
1832     IO_STACK_LOCATION *pIrpSp = IoGetCurrentIrpStackLocation( Irp);
1833     PFILE_OBJECT       pFileObject = pIrpSp->FileObject;
1834     AFSFcb            *pFcb = (AFSFcb *)pFileObject->FsContext;
1835     BOOLEAN            bSynchronousFo = BooleanFlagOn( pFileObject->Flags, FO_SYNCHRONOUS_IO);
1836     ULONG              ulCurrentIO = 0, ulTotalLen = ByteCount;
1837     PMDL               pCurrentMdl = Irp->MdlAddress;
1838     LARGE_INTEGER      liCurrentOffset;
1839
1840     __Enter
1841     {
1842
1843         Irp->IoStatus.Information = 0;
1844
1845         if( BooleanFlagOn( pIrpSp->MinorFunction, IRP_MN_MDL))
1846         {
1847
1848             __try
1849             {
1850
1851                 CcPrepareMdlWrite( pFileObject,
1852                                    &StartingByte,
1853                                    ByteCount,
1854                                    &Irp->MdlAddress,
1855                                    &Irp->IoStatus);
1856
1857                 ntStatus = Irp->IoStatus.Status;
1858             }
1859             __except( EXCEPTION_EXECUTE_HANDLER)
1860             {
1861                 ntStatus = GetExceptionCode();
1862
1863                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1864                               AFS_TRACE_LEVEL_ERROR,
1865                               "AFSCachedWrite (%p) Exception thrown while preparing mdl write Status %08lX\n",
1866                               Irp,
1867                               ntStatus));
1868             }
1869
1870             if( !NT_SUCCESS( ntStatus))
1871             {
1872
1873                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1874                               AFS_TRACE_LEVEL_ERROR,
1875                               "AFSCachedWrite (%p) Failed to process MDL write Status %08lX\n",
1876                               Irp,
1877                               ntStatus));
1878
1879                 if ( Irp->IoStatus.Information > 0)
1880                 {
1881
1882                     CcMdlWriteComplete( pFileObject,
1883                                         &StartingByte,
1884                                         Irp->MdlAddress);
1885
1886                     //
1887                     // Mdl is now Deallocated
1888                     //
1889
1890                     Irp->MdlAddress = NULL;
1891                 }
1892             }
1893
1894             try_return( ntStatus);
1895         }
1896
1897         liCurrentOffset.QuadPart = StartingByte.QuadPart;
1898
1899         while( ulTotalLen > 0)
1900         {
1901
1902             ntStatus = STATUS_SUCCESS;
1903
1904             if( pCurrentMdl != NULL)
1905             {
1906
1907                 pSystemBuffer = MmGetSystemAddressForMdlSafe( pCurrentMdl,
1908                                                               NormalPagePriority);
1909
1910                 ulCurrentIO = MmGetMdlByteCount( pCurrentMdl);
1911
1912                 if( ulCurrentIO > ulTotalLen)
1913                 {
1914                     ulCurrentIO = ulTotalLen;
1915                 }
1916             }
1917             else
1918             {
1919
1920                 pSystemBuffer = AFSLockSystemBuffer( Irp,
1921                                                      ulTotalLen);
1922
1923                 ulCurrentIO = ulTotalLen;
1924             }
1925
1926             if( pSystemBuffer == NULL)
1927             {
1928
1929                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1930                               AFS_TRACE_LEVEL_ERROR,
1931                               "AFSCachedWrite (%p) Failed to lock system buffer\n",
1932                               Irp));
1933
1934                 try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES);
1935             }
1936
1937             __try
1938             {
1939
1940                 if( !CcCopyWrite( pFileObject,
1941                                   &liCurrentOffset,
1942                                   ulCurrentIO,
1943                                   TRUE,
1944                                   pSystemBuffer))
1945                 {
1946                     //
1947                     // Failed to process request.
1948                     //
1949
1950                     AFSDbgTrace(( AFS_SUBSYSTEM_FILE_PROCESSING,
1951                                   AFS_TRACE_LEVEL_ERROR,
1952                                   "AFSCachedWrite (%p) Failed to issue CcCopyWrite %wZ @ %0I64X Status %08lX\n",
1953                                   Irp,
1954                                   &pFileObject->FileName,
1955                                   liCurrentOffset.QuadPart,
1956                                   Irp->IoStatus.Status));
1957
1958                     try_return( ntStatus = STATUS_UNSUCCESSFUL);
1959                 }
1960             }
1961             __except( EXCEPTION_EXECUTE_HANDLER)
1962             {
1963
1964                 ntStatus = GetExceptionCode();
1965
1966                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1967                               AFS_TRACE_LEVEL_ERROR,
1968                               "AFSCachedWrite (%p) CcCopyWrite Threw exception %wZ @ %0I64X Status %08lX\n",
1969                               Irp,
1970                               &pFileObject->FileName,
1971                               liCurrentOffset.QuadPart,
1972                               ntStatus));
1973             }
1974
1975             if( !NT_SUCCESS( ntStatus))
1976             {
1977                 try_return( ntStatus);
1978             }
1979
1980             if( ForceFlush ||
1981                 BooleanFlagOn(pFileObject->Flags, (FO_NO_INTERMEDIATE_BUFFERING + FO_WRITE_THROUGH)))
1982             {
1983
1984                 __try
1985                 {
1986                     //
1987                     // We have detected a file we do a write through with.
1988                     //
1989
1990                     CcFlushCache(&pFcb->NPFcb->SectionObjectPointers,
1991                                   &liCurrentOffset,
1992                                   ulCurrentIO,
1993                                   &iosbFlush);
1994
1995                     if( !NT_SUCCESS( iosbFlush.Status))
1996                     {
1997
1998                         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1999                                       AFS_TRACE_LEVEL_ERROR,
2000                                       "AFSCachedWrite (%p) CcFlushCache failure %wZ FID %08lX-%08lX-%08lX-%08lX Status 0x%08lX Bytes 0x%08lX\n",
2001                                       Irp,
2002                                       &pFileObject->FileName,
2003                                       pFcb->ObjectInformation->FileId.Cell,
2004                                       pFcb->ObjectInformation->FileId.Volume,
2005                                       pFcb->ObjectInformation->FileId.Vnode,
2006                                       pFcb->ObjectInformation->FileId.Unique,
2007                                       iosbFlush.Status,
2008                                       iosbFlush.Information));
2009
2010                         try_return( ntStatus = iosbFlush.Status);
2011                     }
2012                 }
2013                 __except( EXCEPTION_EXECUTE_HANDLER)
2014                 {
2015
2016                     ntStatus = GetExceptionCode();
2017
2018                     AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
2019                                   AFS_TRACE_LEVEL_ERROR,
2020                                   "AFSCachedWrite (%p) CcFlushCache Threw exception %wZ @ %0I64X Status %08lX\n",
2021                                   Irp,
2022                                   &pFileObject->FileName,
2023                                   liCurrentOffset.QuadPart,
2024                                   ntStatus));
2025
2026                     try_return( ntStatus);
2027                 }
2028             }
2029
2030             if( ulTotalLen <= ulCurrentIO)
2031             {
2032                 break;
2033             }
2034
2035             liCurrentOffset.QuadPart += ulCurrentIO;
2036
2037             ulTotalLen -= ulCurrentIO;
2038
2039             pCurrentMdl = pCurrentMdl->Next;
2040         }
2041
2042 try_exit:
2043
2044         if( NT_SUCCESS( ntStatus))
2045         {
2046
2047             Irp->IoStatus.Information = ByteCount;
2048
2049             if ( ForceFlush ||
2050                  BooleanFlagOn(pFileObject->Flags, (FO_NO_INTERMEDIATE_BUFFERING + FO_WRITE_THROUGH)))
2051             {
2052                 //
2053                 // Write through asked for... Set things so that we get
2054                 // flush when the worker thread next wakes up
2055                 //
2056                 pFcb->Specific.File.LastServerFlush.QuadPart = 0;
2057             }
2058         }
2059
2060         AFSCompleteRequest( Irp,
2061                             ntStatus);
2062     }
2063
2064     return ntStatus;
2065 }
2066
2067 //
2068 // Called with Fcb->NPFcb->SectionObjectResource and Fcb->NPFcb->Resource held
2069 //
2070
2071 static
2072 NTSTATUS
2073 AFSExtendingWrite( IN AFSFcb *Fcb,
2074                    IN PFILE_OBJECT FileObject,
2075                    IN LONGLONG NewLength)
2076 {
2077     LARGE_INTEGER liSaveFileSize = Fcb->Header.FileSize;
2078     LARGE_INTEGER liSaveAllocation = Fcb->Header.AllocationSize;
2079     NTSTATUS      ntStatus = STATUS_SUCCESS;
2080     AFSCcb       *pCcb = (AFSCcb *)FileObject->FsContext2;
2081
2082     if( NewLength > Fcb->Header.AllocationSize.QuadPart)
2083     {
2084
2085         Fcb->Header.AllocationSize.QuadPart = NewLength;
2086
2087         Fcb->ObjectInformation->AllocationSize = Fcb->Header.AllocationSize;
2088     }
2089
2090     if( NewLength > Fcb->Header.FileSize.QuadPart)
2091     {
2092
2093         Fcb->Header.FileSize.QuadPart = NewLength;
2094
2095         Fcb->ObjectInformation->EndOfFile = Fcb->Header.FileSize;
2096     }
2097
2098     //
2099     // Tell the server
2100     //
2101
2102     ntStatus = AFSUpdateFileInformation( &Fcb->ObjectInformation->ParentFileId,
2103                                          Fcb->ObjectInformation,
2104                                          &pCcb->AuthGroup);
2105
2106     if (NT_SUCCESS(ntStatus))
2107     {
2108
2109         KeQuerySystemTime( &Fcb->ObjectInformation->ChangeTime);
2110
2111         SetFlag( Fcb->Flags, AFS_FCB_FLAG_FILE_MODIFIED | AFS_FCB_FLAG_UPDATE_CHANGE_TIME);
2112
2113         //
2114         // If the file is currently cached, then let the MM know about the extension
2115         //
2116         // The CcSetFileSizes call should be made with only the PagingResource held
2117         // which we are currently not holding.
2118         //
2119
2120         if( CcIsFileCached( FileObject))
2121         {
2122             CcSetFileSizes( FileObject,
2123                             (PCC_FILE_SIZES)&Fcb->Header.AllocationSize);
2124         }
2125     }
2126     else
2127     {
2128         Fcb->Header.FileSize = liSaveFileSize;
2129         Fcb->Header.AllocationSize = liSaveAllocation;
2130     }
2131
2132     //
2133     // DownConvert file resource to shared
2134     //
2135     ExConvertExclusiveToSharedLite( &Fcb->NPFcb->Resource);
2136
2137     return ntStatus;
2138 }
2139
2140 NTSTATUS
2141 AFSShareWrite( IN PDEVICE_OBJECT DeviceObject,
2142                IN PIRP Irp)
2143 {
2144
2145     UNREFERENCED_PARAMETER(DeviceObject);
2146     NTSTATUS ntStatus = STATUS_SUCCESS;
2147     PIO_STACK_LOCATION pIrpSp = IoGetCurrentIrpStackLocation( Irp);
2148     AFSFcb *pFcb = NULL;
2149     AFSCcb *pCcb = NULL;
2150     AFSPipeIORequestCB *pIoRequest = NULL;
2151     void *pBuffer = NULL;
2152     AFSPipeIOResultCB stIoResult;
2153     ULONG ulBytesReturned = 0;
2154
2155     __Enter
2156     {
2157
2158         pCcb = (AFSCcb *)pIrpSp->FileObject->FsContext2;
2159
2160         AFSDbgTrace(( AFS_SUBSYSTEM_PIPE_PROCESSING,
2161                       AFS_TRACE_LEVEL_VERBOSE,
2162                       "AFSShareWrite On pipe %wZ Length %08lX\n",
2163                       &pCcb->DirectoryCB->NameInformation.FileName,
2164                       pIrpSp->Parameters.Write.Length));
2165
2166         if( pIrpSp->Parameters.Write.Length == 0)
2167         {
2168
2169             //
2170             // Nothing to do in this case
2171             //
2172
2173             try_return( ntStatus);
2174         }
2175
2176         //
2177         // Retrieve the buffer for the read request
2178         //
2179
2180         pBuffer = AFSLockSystemBuffer( Irp,
2181                                        pIrpSp->Parameters.Write.Length);
2182
2183         if( pBuffer == NULL)
2184         {
2185
2186             AFSDbgTrace(( AFS_SUBSYSTEM_PIPE_PROCESSING,
2187                           AFS_TRACE_LEVEL_ERROR,
2188                           "AFSShareWrite Failed to map buffer on pipe %wZ\n",
2189                           &pCcb->DirectoryCB->NameInformation.FileName));
2190
2191             try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES);
2192         }
2193
2194         pFcb = (AFSFcb *)pIrpSp->FileObject->FsContext;
2195
2196         AFSAcquireShared( &pFcb->NPFcb->Resource,
2197                           TRUE);
2198
2199         pIoRequest = (AFSPipeIORequestCB *)AFSExAllocatePoolWithTag( PagedPool,
2200                                                                      sizeof( AFSPipeIORequestCB) +
2201                                                                                 pIrpSp->Parameters.Write.Length,
2202                                                                      AFS_GENERIC_MEMORY_14_TAG);
2203
2204         if( pIoRequest == NULL)
2205         {
2206
2207             try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES);
2208         }
2209
2210         RtlZeroMemory( pIoRequest,
2211                        sizeof( AFSPipeIORequestCB) + pIrpSp->Parameters.Write.Length);
2212
2213         pIoRequest->RequestId = pCcb->RequestID;
2214
2215         pIoRequest->RootId = pFcb->ObjectInformation->VolumeCB->ObjectInformation.FileId;
2216
2217         pIoRequest->BufferLength = pIrpSp->Parameters.Write.Length;
2218
2219         RtlCopyMemory( (void *)((char *)pIoRequest + sizeof( AFSPipeIORequestCB)),
2220                        pBuffer,
2221                        pIrpSp->Parameters.Write.Length);
2222
2223         stIoResult.BytesProcessed = 0;
2224
2225         ulBytesReturned = sizeof( AFSPipeIOResultCB);
2226
2227         //
2228         // Issue the open request to the service
2229         //
2230
2231         ntStatus = AFSProcessRequest( AFS_REQUEST_TYPE_PIPE_WRITE,
2232                                       AFS_REQUEST_FLAG_SYNCHRONOUS,
2233                                       &pCcb->AuthGroup,
2234                                       &pCcb->DirectoryCB->NameInformation.FileName,
2235                                       NULL,
2236                                       NULL,
2237                                       0,
2238                                       pIoRequest,
2239                                       sizeof( AFSPipeIORequestCB) +
2240                                                 pIrpSp->Parameters.Write.Length,
2241                                       &stIoResult,
2242                                       &ulBytesReturned);
2243
2244         if( !NT_SUCCESS( ntStatus))
2245         {
2246
2247             AFSDbgTrace(( AFS_SUBSYSTEM_FILE_PROCESSING,
2248                           AFS_TRACE_LEVEL_ERROR,
2249                           "AFSShareWrite (%p) Failed service write Status %08lX\n",
2250                           Irp,
2251                           ntStatus));
2252
2253             try_return( ntStatus);
2254         }
2255
2256         AFSDbgTrace(( AFS_SUBSYSTEM_PIPE_PROCESSING,
2257                       AFS_TRACE_LEVEL_VERBOSE,
2258                       "AFSShareWrite Completed on pipe %wZ Length read %08lX\n",
2259                       &pCcb->DirectoryCB->NameInformation.FileName,
2260                       stIoResult.BytesProcessed));
2261
2262         Irp->IoStatus.Information = stIoResult.BytesProcessed;
2263
2264 try_exit:
2265
2266         if( pFcb != NULL)
2267         {
2268
2269             AFSReleaseResource( &pFcb->NPFcb->Resource);
2270         }
2271
2272         if( pIoRequest != NULL)
2273         {
2274
2275             AFSExFreePoolWithTag( pIoRequest, AFS_GENERIC_MEMORY_14_TAG);
2276         }
2277     }
2278
2279     return ntStatus;
2280 }