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                         AFSReleaseResource( &pNPFcb->Resource);
 601
 602                         bReleaseMain = FALSE;
 603                     }
 604                 }
 605             }
 606         }
 607         while (!bLockOK);
 608
 609         if( !bPagingIo)
 610         {
 611
 612             //
 613             // Check the BR locks on the file.
 614             //
 615
 616             if ( !FsRtlCheckLockForWriteAccess( &pFcb->Specific.File.FileLock,
 617                                                 Irp))
 618             {
 619
 620                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 621                               AFS_TRACE_LEVEL_ERROR,
 622                               "AFSCommonWrite (%p) Request failed due to lock conflict\n",
 623                               Irp));
 624
 625                 try_return( ntStatus = STATUS_FILE_LOCK_CONFLICT);
 626             }
 627
 628             if( bExtendingWrite)
 629             {
 630
 631                 ntStatus = AFSExtendingWrite( pFcb, pFileObject, (liStartingByte.QuadPart + ulByteCount));
 632
 633                 if( !NT_SUCCESS(ntStatus))
 634                 {
 635
 636                     AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 637                                   AFS_TRACE_LEVEL_ERROR,
 638                                   "AFSCommonWrite (%p) Failed extending write request Status %08lX\n",
 639                                   Irp,
 640                                   ntStatus));
 641
 642                     try_return( ntStatus );
 643                 }
 644             }
 645         }
 646
 647         //
 648         // Fire off the request as appropriate
 649         //
 650         bCompleteIrp = FALSE;
 651
 652         if( !bPagingIo &&
 653             !bNonCachedIo)
 654         {
 655
 656             //
 657             // Main and SectionObject resources held Shared
 658             //
 659
 660             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 661                           AFS_TRACE_LEVEL_VERBOSE,
 662                           "AFSCommonWrite (%p) Processing CACHED request Offset %0I64X Len %08lX%s\n",
 663                           Irp,
 664                           liStartingByte.QuadPart,
 665                           ulByteCount,
 666                           bRetry ? " RETRY" : ""));
 667
 668             ntStatus = AFSCachedWrite( DeviceObject, Irp, liStartingByte, ulByteCount, bForceFlush);
 669         }
 670         else
 671         {
 672
 673             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 674                           AFS_TRACE_LEVEL_VERBOSE,
 675                           "AFSCommonWrite (%p) Processing NON-CACHED request Offset %0I64X Len %08lX%s\n",
 676                           Irp,
 677                           liStartingByte.QuadPart,
 678                           ulByteCount,
 679                           bRetry ? " RETRY" : ""));
 680
 681             if( BooleanFlagOn( pRDRDevExt->DeviceFlags, AFS_DEVICE_FLAG_DIRECT_SERVICE_IO))
 682             {
 683
 684                 ntStatus = AFSNonCachedWriteDirect( DeviceObject, Irp,  liStartingByte, ulByteCount);
 685             }
 686             else
 687             {
 688                 ntStatus = AFSNonCachedWrite( DeviceObject, Irp,  liStartingByte, ulByteCount);
 689             }
 690         }
 691
 692 try_exit:
 693
 694         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 695                       AFS_TRACE_LEVEL_VERBOSE,
 696                       "AFSCommonWrite (%p) Process complete Status %08lX\n",
 697                       Irp,
 698                       ntStatus));
 699
 700         if ( NT_SUCCESS( ntStatus))
 701         {
 702             if ( !bPagingIo)
 703             {
 704
 705                 if( bSynchronousFo)
 706                 {
 707
 708                     pFileObject->CurrentByteOffset.QuadPart = liStartingByte.QuadPart + ulByteCount;
 709                 }
 710
 711                 //
 712                 // If this extended the Vdl, then update it accordingly
 713                 //
 714
 715                 if( liStartingByte.QuadPart + ulByteCount > pFcb->Header.ValidDataLength.QuadPart)
 716                 {
 717
 718                     pFcb->Header.ValidDataLength.QuadPart = liStartingByte.QuadPart + ulByteCount;
 719                 }
 720
 721                 if( !BooleanFlagOn( pFcb->Flags, AFS_FCB_FLAG_UPDATE_LAST_WRITE_TIME))
 722                 {
 723
 724                     SetFlag( pFcb->Flags, AFS_FCB_FLAG_UPDATE_WRITE_TIME);
 725
 726                     KeQuerySystemTime( &pFcb->ObjectInformation->LastWriteTime);
 727                 }
 728             }
 729         }
 730
 731         if ( !bPagingIo && bNonCachedIo && CcIsFileCached( pFileObject) &&
 732              pNPFcb->SectionObjectPointers.DataSectionObject != NULL &&
 733              bReleaseSectionObject)
 734         {
 735             //
 736             // Regardless of whether or not the a non-paging non-cached write
 737             // succeeds or fails, if the file is cached the contents of the
 738             // cache are no longer up to date.  A CcPurgeCacheSection must be
 739             // performed to force subsequent cached reads to obtain the data
 740             // from the service.
 741             //
 742             // The Fcb Resource is dropped in order to permit filters that perform
 743             // an open via a worker thread in response to a purge to do so without
 744             // deadlocking.  The SectionObjectResource is held across the purge to
 745             // prevent racing with other cache operations.
 746             //
 747
 748             if( bReleaseMain)
 749             {
 750
 751                 AFSReleaseResource( &pNPFcb->Resource);
 752
 753                 bReleaseMain = FALSE;
 754             }
 755
 756             if ( !CcPurgeCacheSection( &pNPFcb->SectionObjectPointers,
 757                                        &liStartingByte,
 758                                        ulByteCount,
 759                                        FALSE))
 760             {
 761
 762                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 763                               AFS_TRACE_LEVEL_WARNING,
 764                               "AFSCommonWrite CcPurgeCacheSection failure FID %08lX-%08lX-%08lX-%08lX\n",
 765                               pFcb->ObjectInformation->FileId.Cell,
 766                               pFcb->ObjectInformation->FileId.Volume,
 767                               pFcb->ObjectInformation->FileId.Vnode,
 768                               pFcb->ObjectInformation->FileId.Unique));
 769
 770                 SetFlag( pFcb->Flags, AFS_FCB_FLAG_PURGE_ON_CLOSE);
 771             }
 772         }
 773
 774         ObDereferenceObject(pFileObject);
 775
 776         if( bReleaseSectionObject)
 777         {
 778
 779             AFSReleaseResource( &pNPFcb->SectionObjectResource);
 780         }
 781
 782         if( bReleasePaging)
 783         {
 784
 785             AFSReleaseResource( &pNPFcb->PagingResource);
 786         }
 787
 788         if( bReleaseMain)
 789         {
 790
 791             AFSReleaseResource( &pNPFcb->Resource);
 792         }
 793
 794         if( bCompleteIrp)
 795         {
 796
 797             AFSCompleteRequest( Irp,
 798                                 ntStatus);
 799         }
 800     }
 801
 802     return ntStatus;
 803 }
 804
 805 NTSTATUS
 806 AFSIOCtlWrite( IN PDEVICE_OBJECT DeviceObject,
 807                IN PIRP Irp)
 808 {
 809
 810     UNREFERENCED_PARAMETER(DeviceObject);
 811     NTSTATUS ntStatus = STATUS_SUCCESS;
 812     AFSPIOCtlIORequestCB stIORequestCB;
 813     PIO_STACK_LOCATION pIrpSp = IoGetCurrentIrpStackLocation( Irp);
 814     AFSFcb *pFcb = NULL;
 815     AFSCcb *pCcb = NULL;
 816     AFSPIOCtlIOResultCB stIOResultCB;
 817     ULONG ulBytesReturned = 0;
 818     AFSFileID stParentFID;
 819
 820     __Enter
 821     {
 822
 823         Irp->IoStatus.Information = 0;
 824
 825         RtlZeroMemory( &stIORequestCB,
 826                        sizeof( AFSPIOCtlIORequestCB));
 827
 828         if( pIrpSp->Parameters.Write.Length == 0)
 829         {
 830
 831             //
 832             // Nothing to do in this case
 833             //
 834
 835             try_return( ntStatus);
 836         }
 837
 838         pFcb = (AFSFcb *)pIrpSp->FileObject->FsContext;
 839
 840         pCcb = (AFSCcb *)pIrpSp->FileObject->FsContext2;
 841
 842         AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
 843                       AFS_TRACE_LEVEL_VERBOSE,
 844                       "AFSIOCtlWrite Acquiring Fcb lock %p SHARED %08lX\n",
 845                       &pFcb->NPFcb->Resource,
 846                       PsGetCurrentThread()));
 847
 848         AFSAcquireShared( &pFcb->NPFcb->Resource,
 849                           TRUE);
 850
 851         //
 852         // Get the parent fid to pass to the cm
 853         //
 854
 855         RtlZeroMemory( &stParentFID,
 856                        sizeof( AFSFileID));
 857
 858         if( BooleanFlagOn( pFcb->ObjectInformation->Flags, AFS_OBJECT_FLAGS_PARENT_FID))
 859         {
 860
 861             //
 862             // The parent directory FID of the node
 863             //
 864
 865             stParentFID = pFcb->ObjectInformation->ParentFileId;
 866         }
 867
 868         //
 869         // Set the control block up
 870         //
 871
 872         stIORequestCB.RequestId = pCcb->RequestID;
 873
 874         if( pFcb->ObjectInformation->VolumeCB != NULL)
 875         {
 876             stIORequestCB.RootId = pFcb->ObjectInformation->VolumeCB->ObjectInformation.FileId;
 877         }
 878
 879         //
 880         // Lock down the buffer
 881         //
 882
 883         stIORequestCB.MappedBuffer = AFSMapToService( Irp,
 884                                                       pIrpSp->Parameters.Write.Length);
 885
 886         if( stIORequestCB.MappedBuffer == NULL)
 887         {
 888
 889             try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES);
 890         }
 891
 892         stIORequestCB.BufferLength = pIrpSp->Parameters.Write.Length;
 893
 894         stIOResultCB.BytesProcessed = 0;
 895
 896         ulBytesReturned = sizeof( AFSPIOCtlIOResultCB);
 897
 898         //
 899         // Issue the request to the service
 900         //
 901
 902         ntStatus = AFSProcessRequest( AFS_REQUEST_TYPE_PIOCTL_WRITE,
 903                                       AFS_REQUEST_FLAG_SYNCHRONOUS,
 904                                       &pCcb->AuthGroup,
 905                                       NULL,
 906                                       &stParentFID,
 907                                       NULL,
 908                                       0,
 909                                       (void *)&stIORequestCB,
 910                                       sizeof( AFSPIOCtlIORequestCB),
 911                                       &stIOResultCB,
 912                                       &ulBytesReturned);
 913
 914         if( !NT_SUCCESS( ntStatus))
 915         {
 916
 917             try_return( ntStatus);
 918         }
 919
 920         //
 921         // Update the length written
 922         //
 923
 924         Irp->IoStatus.Information = stIOResultCB.BytesProcessed;
 925
 926 try_exit:
 927
 928         if( stIORequestCB.MappedBuffer != NULL)
 929         {
 930
 931             AFSUnmapServiceMappedBuffer( stIORequestCB.MappedBuffer,
 932                                          Irp->MdlAddress);
 933         }
 934
 935         if( pFcb != NULL)
 936         {
 937
 938             AFSReleaseResource( &pFcb->NPFcb->Resource);
 939         }
 940     }
 941
 942     return ntStatus;
 943 }
 944
 945 //
 946 // This function is called when we know we have to read from the AFS Cache.
 947 //
 948 // It ensures that we have exents for the entirety of the write and
 949 // then pins the extents into memory (meaning that although we may
 950 // add we will not remove).  Then it creates a scatter gather write
 951 // and fires off the IRPs
 952 //
 953 static
 954 NTSTATUS
 955 AFSNonCachedWrite( IN PDEVICE_OBJECT DeviceObject,
 956                    IN PIRP Irp,
 957                    IN LARGE_INTEGER StartingByte,
 958                    IN ULONG ByteCount)
 959 {
 960     NTSTATUS           ntStatus = STATUS_UNSUCCESSFUL;
 961     VOID              *pSystemBuffer = NULL;
 962     BOOLEAN            bPagingIo = BooleanFlagOn( Irp->Flags, IRP_PAGING_IO);
 963     BOOLEAN            bLocked = FALSE;
 964     BOOLEAN            bCompleteIrp = TRUE;
 965     AFSGatherIo       *pGatherIo = NULL;
 966     AFSIoRun          *pIoRuns = NULL;
 967     AFSIoRun           stIoRuns[AFS_MAX_STACK_IO_RUNS];
 968     ULONG              extentsCount = 0, runCount = 0;
 969     AFSExtent         *pStartExtent = NULL;
 970     AFSExtent         *pIgnoreExtent = NULL;
 971     IO_STACK_LOCATION *pIrpSp = IoGetCurrentIrpStackLocation( Irp);
 972     PFILE_OBJECT       pFileObject = pIrpSp->FileObject;
 973     AFSFcb            *pFcb = (AFSFcb *)pFileObject->FsContext;
 974     AFSCcb            *pCcb = (AFSCcb *)pFileObject->FsContext2;
 975     BOOLEAN            bSynchronousFo = BooleanFlagOn( pFileObject->Flags, FO_SYNCHRONOUS_IO);
 976     AFSDeviceExt      *pDevExt = (AFSDeviceExt *)DeviceObject->DeviceExtension;
 977     LARGE_INTEGER      liCurrentTime, liLastRequestTime;
 978     AFSDeviceExt      *pControlDevExt = (AFSDeviceExt *)AFSControlDeviceObject->DeviceExtension;
 979     PFILE_OBJECT       pCacheFileObject = NULL;
 980     BOOLEAN            bDerefExtents = FALSE;
 981
 982     __Enter
 983     {
 984
 985         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 986                       AFS_TRACE_LEVEL_VERBOSE,
 987                       "AFSNonCachedWrite (FO: %p) StartingByte %08lX:%08lX Length %08lX\n",
 988                       pFileObject,
 989                       StartingByte.HighPart,
 990                       StartingByte.LowPart,
 991                       ByteCount));
 992
 993         if (ByteCount > pDevExt->Specific.RDR.MaxIo.QuadPart)
 994         {
 995
 996             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
 997                           AFS_TRACE_LEVEL_ERROR,
 998                           "AFSNonCachedWrite (%p) Request %08lX Actual %08lX larger than MaxIO %I64X\n",
 999                           Irp,
1000                           ByteCount,
1001                           pIrpSp->Parameters.Write.Length,
1002                           pDevExt->Specific.RDR.MaxIo.QuadPart));
1003
1004             try_return( ntStatus = STATUS_UNSUCCESSFUL);
1005         }
1006
1007         //
1008         // Get the mapping for the buffer
1009         //
1010         pSystemBuffer = AFSLockSystemBuffer( Irp,
1011                                              ByteCount);
1012
1013         if( pSystemBuffer == NULL)
1014         {
1015
1016             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1017                           AFS_TRACE_LEVEL_ERROR,
1018                           "AFSNonCachedWrite (%p) Failed to map system buffer\n",
1019                           Irp));
1020
1021             try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES);
1022         }
1023
1024
1025         //
1026         // Provoke a get of the extents - if we need to.
1027         //
1028
1029         AFSDbgTrace(( AFS_SUBSYSTEM_EXTENT_PROCESSING,
1030                       AFS_TRACE_LEVEL_VERBOSE,
1031                       "AFSNonCachedWrite Requesting extents for fid %08lX-%08lX-%08lX-%08lX Offset %0I64X Length %08lX\n",
1032                       pFcb->ObjectInformation->FileId.Cell,
1033                       pFcb->ObjectInformation->FileId.Volume,
1034                       pFcb->ObjectInformation->FileId.Vnode,
1035                       pFcb->ObjectInformation->FileId.Unique,
1036                       StartingByte.QuadPart,
1037                       ByteCount));
1038
1039         ntStatus = AFSRequestExtentsAsync( pFcb,
1040                                            pCcb,
1041                                            &StartingByte,
1042                                            ByteCount);
1043
1044         if (!NT_SUCCESS(ntStatus))
1045         {
1046
1047             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1048                           AFS_TRACE_LEVEL_ERROR,
1049                           "AFSNonCachedWrite (%p) Failed to request extents Status %08lX\n",
1050                           Irp,
1051                           ntStatus));
1052
1053             try_return( ntStatus);
1054         }
1055
1056         KeQueryTickCount( &liLastRequestTime);
1057
1058         while (TRUE)
1059         {
1060
1061             AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1062                           AFS_TRACE_LEVEL_VERBOSE,
1063                           "AFSNonCachedWrite Acquiring Fcb extents lock %p SHARED %08lX\n",
1064                           &pFcb->NPFcb->Specific.File.ExtentsResource,
1065                           PsGetCurrentThread()));
1066
1067             ASSERT( !ExIsResourceAcquiredLite( &pFcb->NPFcb->Specific.File.ExtentsResource ));
1068
1069             AFSAcquireShared( &pFcb->NPFcb->Specific.File.ExtentsResource, TRUE );
1070             bLocked = TRUE;
1071
1072             pStartExtent = NULL;
1073             pIgnoreExtent = NULL;
1074
1075             if ( AFSDoExtentsMapRegion( pFcb, &StartingByte, ByteCount, &pStartExtent, &pIgnoreExtent ))
1076             {
1077                 break;
1078             }
1079
1080             KeClearEvent( &pFcb->NPFcb->Specific.File.ExtentsRequestComplete );
1081
1082             AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1083                           AFS_TRACE_LEVEL_VERBOSE,
1084                           "AFSNonCachedWrite Releasing(1) Fcb extents lock %p SHARED %08lX\n",
1085                           &pFcb->NPFcb->Specific.File.ExtentsResource,
1086                           PsGetCurrentThread()));
1087
1088             AFSReleaseResource( &pFcb->NPFcb->Specific.File.ExtentsResource );
1089             bLocked= FALSE;
1090
1091             //
1092             // We will re-request the extents after waiting for them
1093             //
1094
1095             KeQueryTickCount( &liCurrentTime);
1096
1097             if( liCurrentTime.QuadPart - liLastRequestTime.QuadPart >= pControlDevExt->Specific.Control.ExtentRequestTimeCount.QuadPart)
1098             {
1099
1100                 AFSDbgTrace(( AFS_SUBSYSTEM_EXTENT_PROCESSING,
1101                               AFS_TRACE_LEVEL_VERBOSE,
1102                               "AFSNonCachedWrite Requesting extents, again, for fid %08lX-%08lX-%08lX-%08lX Offset %0I64X Length %08lX\n",
1103                               pFcb->ObjectInformation->FileId.Cell,
1104                               pFcb->ObjectInformation->FileId.Volume,
1105                               pFcb->ObjectInformation->FileId.Vnode,
1106                               pFcb->ObjectInformation->FileId.Unique,
1107                               StartingByte.QuadPart,
1108                               ByteCount));
1109
1110                 ntStatus = AFSRequestExtentsAsync( pFcb,
1111                                                    pCcb,
1112                                                    &StartingByte,
1113                                                    ByteCount);
1114
1115                 if (!NT_SUCCESS(ntStatus))
1116                 {
1117
1118                     AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1119                                   AFS_TRACE_LEVEL_ERROR,
1120                                   "AFSNonCachedWrite (%p) Failed to request extents Status %08lX\n",
1121                                   Irp,
1122                                   ntStatus));
1123
1124                     try_return( ntStatus);
1125                 }
1126
1127                 KeQueryTickCount( &liLastRequestTime);
1128             }
1129
1130
1131             AFSDbgTrace(( AFS_SUBSYSTEM_EXTENT_PROCESSING,
1132                           AFS_TRACE_LEVEL_VERBOSE,
1133                           "AFSNonCachedWrite Waiting for extents for fid %08lX-%08lX-%08lX-%08lX Offset %0I64X Length %08lX\n",
1134                           pFcb->ObjectInformation->FileId.Cell,
1135                           pFcb->ObjectInformation->FileId.Volume,
1136                           pFcb->ObjectInformation->FileId.Vnode,
1137                           pFcb->ObjectInformation->FileId.Unique,
1138                           StartingByte.QuadPart,
1139                           ByteCount));
1140
1141             //
1142             // Wait for it
1143             //
1144
1145             ntStatus =  AFSWaitForExtentMapping ( pFcb, pCcb);
1146
1147             if (!NT_SUCCESS(ntStatus))
1148             {
1149
1150                 AFSDbgTrace(( AFS_SUBSYSTEM_EXTENT_PROCESSING,
1151                               AFS_TRACE_LEVEL_ERROR,
1152                               "AFSNonCachedWrite Failed wait for extents for fid %08lX-%08lX-%08lX-%08lX Offset %0I64X Length %08lX Status %08lX\n",
1153                               pFcb->ObjectInformation->FileId.Cell,
1154                               pFcb->ObjectInformation->FileId.Volume,
1155                               pFcb->ObjectInformation->FileId.Vnode,
1156                               pFcb->ObjectInformation->FileId.Unique,
1157                               StartingByte.QuadPart,
1158                               ByteCount,
1159                               ntStatus));
1160
1161                 try_return( ntStatus);
1162             }
1163         }
1164
1165         //
1166         // As per the read path -
1167         //
1168
1169         AFSDbgTrace(( AFS_SUBSYSTEM_EXTENT_PROCESSING,
1170                       AFS_TRACE_LEVEL_VERBOSE,
1171                       "AFSNonCachedWrite Extents located for fid %08lX-%08lX-%08lX-%08lX Offset %0I64X Length %08lX\n",
1172                       pFcb->ObjectInformation->FileId.Cell,
1173                       pFcb->ObjectInformation->FileId.Volume,
1174                       pFcb->ObjectInformation->FileId.Vnode,
1175                       pFcb->ObjectInformation->FileId.Unique,
1176                       StartingByte.QuadPart,
1177                       ByteCount));
1178
1179         ntStatus = AFSGetExtents( pFcb,
1180                                   &StartingByte,
1181                                   ByteCount,
1182                                   pStartExtent,
1183                                   &extentsCount,
1184                                   &runCount);
1185
1186         if (!NT_SUCCESS(ntStatus))
1187         {
1188
1189             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1190                           AFS_TRACE_LEVEL_ERROR,
1191                           "AFSNonCachedWrite (%p) Failed to retrieve mapped extents Status %08lX\n",
1192                           Irp,
1193                           ntStatus));
1194
1195             try_return( ntStatus );
1196         }
1197
1198         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1199                       AFS_TRACE_LEVEL_VERBOSE,
1200                       "AFSNonCachedWrite (%p) Successfully retrieved map extents count %d run count %d\n",
1201                       Irp,
1202                       extentsCount,
1203                       runCount));
1204
1205         if( BooleanFlagOn( AFSLibControlFlags, AFS_REDIR_LIB_FLAGS_NONPERSISTENT_CACHE))
1206         {
1207
1208             Irp->IoStatus.Information = ByteCount;
1209
1210 #if GEN_MD5
1211             //
1212             // Setup the MD5 for each extent
1213             //
1214
1215             AFSSetupMD5Hash( pFcb,
1216                              pStartExtent,
1217                              extentsCount,
1218                              pSystemBuffer,
1219                              &StartingByte,
1220                              ByteCount);
1221 #endif
1222
1223             ntStatus = AFSProcessExtentRun( pSystemBuffer,
1224                                             &StartingByte,
1225                                             ByteCount,
1226                                             pStartExtent,
1227                                             TRUE);
1228
1229             if (!NT_SUCCESS(ntStatus))
1230             {
1231
1232                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1233                               AFS_TRACE_LEVEL_ERROR,
1234                               "AFSNonCachedWrite (%p) Failed to process extent run for non-persistent cache Status %08lX\n",
1235                               Irp,
1236                               ntStatus));
1237             }
1238
1239             try_return( ntStatus);
1240         }
1241
1242         //
1243         // Retrieve the cache file object
1244         //
1245
1246         pCacheFileObject = AFSReferenceCacheFileObject();
1247
1248         if( pCacheFileObject == NULL)
1249         {
1250
1251             ntStatus = STATUS_DEVICE_NOT_READY;
1252
1253             AFSDbgTrace(( AFS_SUBSYSTEM_EXTENT_PROCESSING,
1254                           AFS_TRACE_LEVEL_ERROR,
1255                           "AFSNonCachedWrite Failed to retrieve cache fileobject for fid %08lX-%08lX-%08lX-%08lX Offset %0I64X Length %08lX Status %08lX\n",
1256                           pFcb->ObjectInformation->FileId.Cell,
1257                           pFcb->ObjectInformation->FileId.Volume,
1258                           pFcb->ObjectInformation->FileId.Vnode,
1259                           pFcb->ObjectInformation->FileId.Unique,
1260                           StartingByte.QuadPart,
1261                           ByteCount,
1262                           ntStatus));
1263
1264             try_return( ntStatus);
1265         }
1266
1267         if (runCount > AFS_MAX_STACK_IO_RUNS)
1268         {
1269
1270             pIoRuns = (AFSIoRun*) AFSExAllocatePoolWithTag( PagedPool,
1271                                                             runCount * sizeof( AFSIoRun ),
1272                                                             AFS_IO_RUN_TAG );
1273             if (NULL == pIoRuns)
1274             {
1275
1276                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1277                               AFS_TRACE_LEVEL_ERROR,
1278                               "AFSNonCachedWrite (%p) Failed to allocate IO run block\n",
1279                               Irp));
1280
1281                 try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES );
1282             }
1283         }
1284         else
1285         {
1286
1287             pIoRuns = stIoRuns;
1288         }
1289
1290         RtlZeroMemory( pIoRuns, runCount * sizeof( AFSIoRun ));
1291
1292         ntStatus = AFSSetupIoRun( IoGetRelatedDeviceObject( pCacheFileObject),
1293                                   Irp,
1294                                   pSystemBuffer,
1295                                   pIoRuns,
1296                                   &StartingByte,
1297                                   ByteCount,
1298                                   pStartExtent,
1299                                   &runCount );
1300
1301         if (!NT_SUCCESS(ntStatus))
1302         {
1303
1304             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1305                           AFS_TRACE_LEVEL_ERROR,
1306                           "AFSNonCachedWrite (%p) Failed to initialize IO run block Status %08lX\n",
1307                           Irp,
1308                           ntStatus));
1309
1310             try_return( ntStatus );
1311         }
1312
1313         AFSReferenceActiveExtents( pStartExtent,
1314                                    extentsCount);
1315
1316         bDerefExtents = TRUE;
1317
1318         AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1319                       AFS_TRACE_LEVEL_VERBOSE,
1320                       "AFSNonCachedWrite Releasing(2) Fcb extents lock %p SHARED %08lX\n",
1321                       &pFcb->NPFcb->Specific.File.ExtentsResource,
1322                       PsGetCurrentThread()));
1323
1324         AFSReleaseResource( &pFcb->NPFcb->Specific.File.ExtentsResource );
1325         bLocked = FALSE;
1326
1327         pGatherIo = (AFSGatherIo*) AFSExAllocatePoolWithTag( NonPagedPool,
1328                                                              sizeof( AFSGatherIo),
1329                                                              AFS_GATHER_TAG);
1330
1331         if (NULL == pGatherIo)
1332         {
1333
1334             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1335                           AFS_TRACE_LEVEL_ERROR,
1336                           "AFSNonCachedWrite (%p) Failed to allocate IO gather block\n",
1337                           Irp));
1338
1339             AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1340                           AFS_TRACE_LEVEL_VERBOSE,
1341                           "AFSNonCachedWrite Acquiring(1) Fcb extents lock %p SHARED %08lX\n",
1342                           &pFcb->NPFcb->Specific.File.ExtentsResource,
1343                           PsGetCurrentThread()));
1344
1345             AFSAcquireShared( &pFcb->NPFcb->Specific.File.ExtentsResource,
1346                               TRUE);
1347             bLocked = TRUE;
1348
1349             AFSDereferenceActiveExtents( pStartExtent,
1350                                          extentsCount);
1351
1352             try_return (ntStatus = STATUS_INSUFFICIENT_RESOURCES );
1353         }
1354
1355         RtlZeroMemory( pGatherIo, sizeof( AFSGatherIo ));
1356
1357         //
1358         // Initialize count to 1, that was we won't get an early
1359         // completion if the first irp completes before the second is
1360         // queued.
1361         //
1362         pGatherIo->Count = 1;
1363         pGatherIo->Status = STATUS_SUCCESS;
1364         pGatherIo->MasterIrp = Irp;
1365         pGatherIo->Synchronous = TRUE;
1366         pGatherIo->CompleteMasterIrp = FALSE;
1367
1368         bCompleteIrp = TRUE;
1369
1370         if( pGatherIo->Synchronous)
1371         {
1372             KeInitializeEvent( &pGatherIo->Event, NotificationEvent, FALSE );
1373         }
1374
1375 #if GEN_MD5
1376         //
1377         // Setup the MD5 for each extent
1378         //
1379
1380         AFSSetupMD5Hash( pFcb,
1381                          pStartExtent,
1382                          extentsCount,
1383                          pSystemBuffer,
1384                          &StartingByte,
1385                          ByteCount);
1386 #endif
1387
1388         //
1389         // Pre-emptively set up the count
1390         //
1391
1392         Irp->IoStatus.Information = ByteCount;
1393
1394         ntStatus = AFSQueueStartIos( pCacheFileObject,
1395                                      IRP_MJ_WRITE,
1396                                      IRP_WRITE_OPERATION | IRP_SYNCHRONOUS_API,
1397                                      pIoRuns,
1398                                      runCount,
1399                                      pGatherIo);
1400
1401         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1402                       AFS_TRACE_LEVEL_VERBOSE,
1403                       "AFSNonCachedWrite (%p) AFSStartIos completed Status %08lX\n",
1404                       Irp,
1405                       ntStatus));
1406
1407         if( !NT_SUCCESS( ntStatus))
1408         {
1409
1410             AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1411                           AFS_TRACE_LEVEL_VERBOSE,
1412                           "AFSNonCachedWrite Acquiring(2) Fcb extents lock %p SHARED %08lX\n",
1413                           &pFcb->NPFcb->Specific.File.ExtentsResource,
1414                           PsGetCurrentThread()));
1415
1416             AFSAcquireShared( &pFcb->NPFcb->Specific.File.ExtentsResource,
1417                               TRUE);
1418             bLocked = TRUE;
1419
1420             AFSDereferenceActiveExtents( pStartExtent,
1421                                          extentsCount);
1422
1423             try_return( ntStatus);
1424         }
1425
1426         //
1427         // Wait for completion of All IOs we started.
1428         //
1429
1430         ntStatus = KeWaitForSingleObject( &pGatherIo->Event,
1431                                           Executive,
1432                                           KernelMode,
1433                                           FALSE,
1434                                           NULL);
1435
1436         if( NT_SUCCESS( ntStatus))
1437         {
1438
1439             ntStatus = pGatherIo->Status;
1440         }
1441
1442         if( !NT_SUCCESS( ntStatus))
1443         {
1444
1445             AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1446                           AFS_TRACE_LEVEL_VERBOSE,
1447                           "AFSNonCachedWrite Acquiring(3) Fcb extents lock %p SHARED %08lX\n",
1448                           &pFcb->NPFcb->Specific.File.ExtentsResource,
1449                           PsGetCurrentThread()));
1450
1451             AFSAcquireShared( &pFcb->NPFcb->Specific.File.ExtentsResource,
1452                               TRUE);
1453             bLocked = TRUE;
1454
1455             AFSDereferenceActiveExtents( pStartExtent,
1456                                          extentsCount);
1457
1458             try_return( ntStatus);
1459         }
1460
1461 try_exit:
1462
1463         if( NT_SUCCESS( ntStatus) &&
1464             pStartExtent != NULL &&
1465             Irp->IoStatus.Information > 0)
1466         {
1467
1468             if ( !bLocked)
1469             {
1470
1471                 AFSAcquireShared( &pFcb->NPFcb->Specific.File.ExtentsResource,
1472                                   TRUE);
1473                 bLocked = TRUE;
1474             }
1475
1476             //
1477             // Since this is dirty we can mark the extents dirty now.
1478             // AFSMarkDirty will dereference the extents.  Do not call
1479             // AFSDereferenceActiveExtents() in this code path.
1480             //
1481
1482             AFSMarkDirty( pFcb,
1483                           pStartExtent,
1484                           extentsCount,
1485                           &StartingByte,
1486                           bDerefExtents);
1487
1488             if (!bPagingIo)
1489             {
1490                 //
1491                 // This was an uncached user write - tell the server to do
1492                 // the flush when the worker thread next wakes up
1493                 //
1494                 pFcb->Specific.File.LastServerFlush.QuadPart = 0;
1495             }
1496         }
1497
1498         if( pCacheFileObject != NULL)
1499         {
1500             AFSReleaseCacheFileObject( pCacheFileObject);
1501         }
1502
1503         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1504                       AFS_TRACE_LEVEL_VERBOSE,
1505                       "AFSNonCachedWrite (FO: %p) StartingByte %08lX:%08lX Length %08lX Status %08lX\n",
1506                       pFileObject,
1507                       StartingByte.HighPart,
1508                       StartingByte.LowPart,
1509                       ByteCount,
1510                       ntStatus));
1511
1512         if (NT_SUCCESS(ntStatus) &&
1513             !bPagingIo &&
1514             bSynchronousFo)
1515         {
1516
1517             pFileObject->CurrentByteOffset.QuadPart = StartingByte.QuadPart + ByteCount;
1518         }
1519
1520         if( bLocked)
1521         {
1522
1523             AFSDbgTrace(( AFS_SUBSYSTEM_LOCK_PROCESSING,
1524                           AFS_TRACE_LEVEL_VERBOSE,
1525                           "AFSNonCachedWrite Releasing Fcb extents lock %p SHARED %08lX\n",
1526                           &pFcb->NPFcb->Specific.File.ExtentsResource,
1527                           PsGetCurrentThread()));
1528
1529             AFSReleaseResource( &pFcb->NPFcb->Specific.File.ExtentsResource );
1530         }
1531
1532         if( pGatherIo)
1533         {
1534             AFSExFreePoolWithTag(pGatherIo, AFS_GATHER_TAG);
1535         }
1536
1537         if( NULL != pIoRuns &&
1538             stIoRuns != pIoRuns)
1539         {
1540             AFSExFreePoolWithTag(pIoRuns, AFS_IO_RUN_TAG);
1541         }
1542
1543         if( bCompleteIrp)
1544         {
1545
1546             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1547                           AFS_TRACE_LEVEL_VERBOSE,
1548                           "AFSNonCachedWrite Completing Irp %p Status %08lX Info %08lX\n",
1549                           Irp,
1550                           ntStatus,
1551                           Irp->IoStatus.Information));
1552
1553             AFSCompleteRequest( Irp, ntStatus);
1554         }
1555     }
1556
1557     return ntStatus;
1558 }
1559
1560 static
1561 NTSTATUS
1562 AFSNonCachedWriteDirect( IN PDEVICE_OBJECT DeviceObject,
1563                          IN PIRP Irp,
1564                          IN LARGE_INTEGER StartingByte,
1565                          IN ULONG ByteCount)
1566 {
1567     NTSTATUS           ntStatus = STATUS_UNSUCCESSFUL;
1568     VOID              *pSystemBuffer = NULL;
1569     BOOLEAN            bPagingIo = BooleanFlagOn( Irp->Flags, IRP_PAGING_IO);
1570     IO_STACK_LOCATION *pIrpSp = IoGetCurrentIrpStackLocation( Irp);
1571     PFILE_OBJECT       pFileObject = pIrpSp->FileObject;
1572     AFSFcb            *pFcb = (AFSFcb *)pFileObject->FsContext;
1573     AFSCcb            *pCcb = (AFSCcb *)pFileObject->FsContext2;
1574     BOOLEAN            bSynchronousFo = BooleanFlagOn( pFileObject->Flags, FO_SYNCHRONOUS_IO);
1575     BOOLEAN            bNoIntermediateBuffering = BooleanFlagOn( pFileObject->Flags, FO_NO_INTERMEDIATE_BUFFERING);
1576     AFSDeviceExt      *pDevExt = (AFSDeviceExt *)DeviceObject->DeviceExtension;
1577     AFSFileIOCB        stFileIORequest;
1578     AFSFileIOResultCB  stFileIOResult;
1579     ULONG              ulResultLen = 0;
1580     ULONG              ulFlags;
1581
1582     __Enter
1583     {
1584         Irp->IoStatus.Information = 0;
1585
1586         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1587                       AFS_TRACE_LEVEL_VERBOSE,
1588                       "AFSNonCachedWriteDirect (FO: %p) StartingByte %08lX:%08lX Length %08lX\n",
1589                       pFileObject,
1590                       StartingByte.HighPart,
1591                       StartingByte.LowPart,
1592                       ByteCount));
1593
1594         if (ByteCount > pDevExt->Specific.RDR.MaxIo.QuadPart)
1595         {
1596
1597             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1598                           AFS_TRACE_LEVEL_ERROR,
1599                           "AFSNonCachedWriteDirect (%p) Request %08lX Actual %08lX larger than MaxIO %I64X\n",
1600                           Irp,
1601                           ByteCount,
1602                           pIrpSp->Parameters.Write.Length,
1603                           pDevExt->Specific.RDR.MaxIo.QuadPart));
1604
1605             try_return( ntStatus = STATUS_UNSUCCESSFUL);
1606         }
1607
1608         //
1609         // Get the mapping for the buffer
1610         //
1611         pSystemBuffer = AFSLockSystemBuffer( Irp,
1612                                              ByteCount);
1613
1614         if( pSystemBuffer == NULL)
1615         {
1616
1617             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1618                           AFS_TRACE_LEVEL_ERROR,
1619                           "AFSNonCachedWriteDirect (%p) Failed to map system buffer\n",
1620                           Irp));
1621
1622             try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES);
1623         }
1624
1625         //
1626         // Issue the request at the service for processing
1627         //
1628
1629         ulResultLen = sizeof( AFSFileIOResultCB);
1630
1631         RtlZeroMemory( &stFileIORequest,
1632                        sizeof( AFSFileIOCB));
1633
1634         RtlZeroMemory( &stFileIOResult,
1635                        sizeof( AFSFileIOResultCB));
1636
1637         stFileIORequest.SystemIOBuffer = pSystemBuffer;
1638
1639         stFileIORequest.SystemIOBufferMdl = Irp->MdlAddress;
1640
1641         stFileIORequest.IOLength = ByteCount;
1642
1643         stFileIORequest.IOOffset = StartingByte;
1644
1645         ulFlags = AFS_REQUEST_FLAG_SYNCHRONOUS;
1646
1647         if ( bNoIntermediateBuffering)
1648         {
1649
1650             ulFlags |= AFS_REQUEST_FLAG_CACHE_BYPASS;
1651         }
1652
1653         //
1654         // Update file metadata
1655         //
1656
1657         stFileIORequest.EndOfFile = pFcb->ObjectInformation->EndOfFile;
1658
1659         stFileIORequest.CreateTime = pFcb->ObjectInformation->CreationTime;
1660
1661         stFileIORequest.ChangeTime = pFcb->ObjectInformation->ChangeTime;
1662
1663         stFileIORequest.LastAccessTime = pFcb->ObjectInformation->LastAccessTime;
1664
1665         stFileIORequest.LastWriteTime = pFcb->ObjectInformation->LastWriteTime;
1666
1667         //
1668         // Write the data to the service
1669         //
1670
1671         ntStatus = AFSProcessRequest( AFS_REQUEST_TYPE_PROCESS_WRITE_FILE,
1672                                       ulFlags,
1673                                       &pCcb->AuthGroup,
1674                                       &pCcb->DirectoryCB->NameInformation.FileName,
1675                                       &pFcb->ObjectInformation->FileId,
1676                                       pFcb->ObjectInformation->VolumeCB->VolumeInformation.Cell,
1677                                       pFcb->ObjectInformation->VolumeCB->VolumeInformation.CellLength,
1678                                       &stFileIORequest,
1679                                       sizeof( AFSFileIOCB),
1680                                       &stFileIOResult,
1681                                       &ulResultLen);
1682
1683         if( NT_SUCCESS( ntStatus))
1684         {
1685
1686             Irp->IoStatus.Information = (ULONG_PTR)stFileIOResult.Length;
1687         }
1688         else
1689         {
1690
1691             AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1692                           AFS_TRACE_LEVEL_ERROR,
1693                           "AFSNonCachedWriteDirect (%p) Failed to send write to service Status %08lX\n",
1694                           Irp,
1695                           ntStatus));
1696         }
1697
1698 try_exit:
1699
1700         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1701                       AFS_TRACE_LEVEL_VERBOSE,
1702                       "AFSNonCachedWriteDirect (FO: %p) StartingByte %08lX:%08lX Length %08lX Status %08lX\n",
1703                       pFileObject,
1704                       StartingByte.HighPart,
1705                       StartingByte.LowPart,
1706                       ByteCount,
1707                       ntStatus));
1708
1709         if (NT_SUCCESS(ntStatus) &&
1710             !bPagingIo &&
1711             bSynchronousFo)
1712         {
1713
1714             pFileObject->CurrentByteOffset.QuadPart = StartingByte.QuadPart + ByteCount;
1715         }
1716
1717         AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1718                       AFS_TRACE_LEVEL_VERBOSE,
1719                       "AFSNonCachedWriteDirect Completing Irp %p Status %08lX Info %08lX\n",
1720                       Irp,
1721                       ntStatus,
1722                       Irp->IoStatus.Information));
1723
1724         AFSCompleteRequest( Irp, ntStatus);
1725     }
1726
1727     return ntStatus;
1728 }
1729
1730 static
1731 NTSTATUS
1732 AFSCachedWrite( IN PDEVICE_OBJECT DeviceObject,
1733                 IN PIRP Irp,
1734                 IN LARGE_INTEGER StartingByte,
1735                 IN ULONG ByteCount,
1736                 IN BOOLEAN ForceFlush)
1737 {
1738     UNREFERENCED_PARAMETER(DeviceObject);
1739     PVOID              pSystemBuffer = NULL;
1740     NTSTATUS           ntStatus = STATUS_SUCCESS;
1741     IO_STATUS_BLOCK    iosbFlush;
1742     IO_STACK_LOCATION *pIrpSp = IoGetCurrentIrpStackLocation( Irp);
1743     PFILE_OBJECT       pFileObject = pIrpSp->FileObject;
1744     AFSFcb            *pFcb = (AFSFcb *)pFileObject->FsContext;
1745     BOOLEAN            bSynchronousFo = BooleanFlagOn( pFileObject->Flags, FO_SYNCHRONOUS_IO);
1746     ULONG              ulCurrentIO = 0, ulTotalLen = ByteCount;
1747     PMDL               pCurrentMdl = Irp->MdlAddress;
1748     LARGE_INTEGER      liCurrentOffset;
1749
1750     __Enter
1751     {
1752
1753         Irp->IoStatus.Information = 0;
1754
1755         if( BooleanFlagOn( pIrpSp->MinorFunction, IRP_MN_MDL))
1756         {
1757
1758             __try
1759             {
1760
1761                 CcPrepareMdlWrite( pFileObject,
1762                                    &StartingByte,
1763                                    ByteCount,
1764                                    &Irp->MdlAddress,
1765                                    &Irp->IoStatus);
1766
1767                 ntStatus = Irp->IoStatus.Status;
1768             }
1769             __except( EXCEPTION_EXECUTE_HANDLER)
1770             {
1771                 ntStatus = GetExceptionCode();
1772
1773                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1774                               AFS_TRACE_LEVEL_ERROR,
1775                               "AFSCachedWrite (%p) Exception thrown while preparing mdl write Status %08lX\n",
1776                               Irp,
1777                               ntStatus));
1778             }
1779
1780             if( !NT_SUCCESS( ntStatus))
1781             {
1782
1783                 //
1784                 // Free up any potentially allocated mdl's
1785                 //
1786
1787                 CcMdlWriteComplete( pFileObject,
1788                                     &StartingByte,
1789                                     Irp->MdlAddress);
1790
1791                 Irp->MdlAddress = NULL;
1792
1793                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1794                               AFS_TRACE_LEVEL_ERROR,
1795                               "AFSCachedWrite (%p) Failed to process MDL write Status %08lX\n",
1796                               Irp,
1797                               ntStatus));
1798             }
1799
1800             try_return( ntStatus);
1801         }
1802
1803         liCurrentOffset.QuadPart = StartingByte.QuadPart;
1804
1805         while( ulTotalLen > 0)
1806         {
1807
1808             ntStatus = STATUS_SUCCESS;
1809
1810             if( pCurrentMdl != NULL)
1811             {
1812
1813                 pSystemBuffer = MmGetSystemAddressForMdlSafe( pCurrentMdl,
1814                                                               NormalPagePriority);
1815
1816                 ulCurrentIO = MmGetMdlByteCount( pCurrentMdl);
1817
1818                 if( ulCurrentIO > ulTotalLen)
1819                 {
1820                     ulCurrentIO = ulTotalLen;
1821                 }
1822             }
1823             else
1824             {
1825
1826                 pSystemBuffer = AFSLockSystemBuffer( Irp,
1827                                                      ulTotalLen);
1828
1829                 ulCurrentIO = ulTotalLen;
1830             }
1831
1832             if( pSystemBuffer == NULL)
1833             {
1834
1835                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1836                               AFS_TRACE_LEVEL_ERROR,
1837                               "AFSCachedWrite (%p) Failed to lock system buffer\n",
1838                               Irp));
1839
1840                 try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES);
1841             }
1842
1843             __try
1844             {
1845
1846                 if( !CcCopyWrite( pFileObject,
1847                                   &liCurrentOffset,
1848                                   ulCurrentIO,
1849                                   TRUE,
1850                                   pSystemBuffer))
1851                 {
1852                     //
1853                     // Failed to process request.
1854                     //
1855
1856                     AFSDbgTrace(( AFS_SUBSYSTEM_FILE_PROCESSING,
1857                                   AFS_TRACE_LEVEL_ERROR,
1858                                   "AFSCachedWrite (%p) Failed to issue CcCopyWrite %wZ @ %0I64X Status %08lX\n",
1859                                   Irp,
1860                                   &pFileObject->FileName,
1861                                   liCurrentOffset.QuadPart,
1862                                   Irp->IoStatus.Status));
1863
1864                     try_return( ntStatus = STATUS_UNSUCCESSFUL);
1865                 }
1866             }
1867             __except( EXCEPTION_EXECUTE_HANDLER)
1868             {
1869
1870                 ntStatus = GetExceptionCode();
1871
1872                 AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1873                               AFS_TRACE_LEVEL_ERROR,
1874                               "AFSCachedWrite (%p) CcCopyWrite Threw exception %wZ @ %0I64X Status %08lX\n",
1875                               Irp,
1876                               &pFileObject->FileName,
1877                               liCurrentOffset.QuadPart,
1878                               ntStatus));
1879             }
1880
1881             if( !NT_SUCCESS( ntStatus))
1882             {
1883                 try_return( ntStatus);
1884             }
1885
1886             if( ForceFlush ||
1887                 BooleanFlagOn(pFileObject->Flags, (FO_NO_INTERMEDIATE_BUFFERING + FO_WRITE_THROUGH)))
1888             {
1889
1890                 //
1891                 // We have detected a file we do a write through with.
1892                 //
1893
1894                 CcFlushCache(&pFcb->NPFcb->SectionObjectPointers,
1895                              &liCurrentOffset,
1896                              ulCurrentIO,
1897                              &iosbFlush);
1898
1899                 if( !NT_SUCCESS( iosbFlush.Status))
1900                 {
1901
1902                     AFSDbgTrace(( AFS_SUBSYSTEM_IO_PROCESSING,
1903                                   AFS_TRACE_LEVEL_ERROR,
1904                                   "AFSCachedWrite (%p) CcFlushCache failure %wZ FID %08lX-%08lX-%08lX-%08lX Status 0x%08lX Bytes 0x%08lX\n",
1905                                   Irp,
1906                                   &pFileObject->FileName,
1907                                   pFcb->ObjectInformation->FileId.Cell,
1908                                   pFcb->ObjectInformation->FileId.Volume,
1909                                   pFcb->ObjectInformation->FileId.Vnode,
1910                                   pFcb->ObjectInformation->FileId.Unique,
1911                                   iosbFlush.Status,
1912                                   iosbFlush.Information));
1913
1914                     try_return( ntStatus = iosbFlush.Status);
1915                 }
1916             }
1917
1918             if( ulTotalLen <= ulCurrentIO)
1919             {
1920                 break;
1921             }
1922
1923             liCurrentOffset.QuadPart += ulCurrentIO;
1924
1925             ulTotalLen -= ulCurrentIO;
1926
1927             pCurrentMdl = pCurrentMdl->Next;
1928         }
1929
1930 try_exit:
1931
1932         if( NT_SUCCESS( ntStatus))
1933         {
1934
1935             Irp->IoStatus.Information = ByteCount;
1936
1937             if ( ForceFlush ||
1938                  BooleanFlagOn(pFileObject->Flags, (FO_NO_INTERMEDIATE_BUFFERING + FO_WRITE_THROUGH)))
1939             {
1940                 //
1941                 // Write through asked for... Set things so that we get
1942                 // flush when the worker thread next wakes up
1943                 //
1944                 pFcb->Specific.File.LastServerFlush.QuadPart = 0;
1945             }
1946         }
1947
1948         AFSCompleteRequest( Irp,
1949                             ntStatus);
1950     }
1951
1952     return ntStatus;
1953 }
1954
1955 static
1956 NTSTATUS
1957 AFSExtendingWrite( IN AFSFcb *Fcb,
1958                    IN PFILE_OBJECT FileObject,
1959                    IN LONGLONG NewLength)
1960 {
1961     LARGE_INTEGER liSaveFileSize = Fcb->Header.FileSize;
1962     LARGE_INTEGER liSaveAllocation = Fcb->Header.AllocationSize;
1963     NTSTATUS      ntStatus = STATUS_SUCCESS;
1964     AFSCcb       *pCcb = (AFSCcb *)FileObject->FsContext2;
1965
1966     if( NewLength > Fcb->Header.AllocationSize.QuadPart)
1967     {
1968
1969         Fcb->Header.AllocationSize.QuadPart = NewLength;
1970
1971         Fcb->ObjectInformation->AllocationSize = Fcb->Header.AllocationSize;
1972     }
1973
1974     if( NewLength > Fcb->Header.FileSize.QuadPart)
1975     {
1976
1977         Fcb->Header.FileSize.QuadPart = NewLength;
1978
1979         Fcb->ObjectInformation->EndOfFile = Fcb->Header.FileSize;
1980     }
1981
1982     //
1983     // Tell the server
1984     //
1985
1986     ntStatus = AFSUpdateFileInformation( &Fcb->ObjectInformation->ParentFileId,
1987                                          Fcb->ObjectInformation,
1988                                          &pCcb->AuthGroup);
1989
1990     if (NT_SUCCESS(ntStatus))
1991     {
1992
1993         KeQuerySystemTime( &Fcb->ObjectInformation->ChangeTime);
1994
1995         SetFlag( Fcb->Flags, AFS_FCB_FLAG_FILE_MODIFIED | AFS_FCB_FLAG_UPDATE_CHANGE_TIME);
1996
1997         //
1998         // If the file is currently cached, then let the MM know about the extension
1999         //
2000
2001         if( CcIsFileCached( FileObject))
2002         {
2003             CcSetFileSizes( FileObject,
2004                             (PCC_FILE_SIZES)&Fcb->Header.AllocationSize);
2005         }
2006     }
2007     else
2008     {
2009         Fcb->Header.FileSize = liSaveFileSize;
2010         Fcb->Header.AllocationSize = liSaveAllocation;
2011     }
2012
2013     //
2014     // DownConvert file resource to shared
2015     //
2016     ExConvertExclusiveToSharedLite( &Fcb->NPFcb->Resource);
2017
2018     return ntStatus;
2019 }
2020
2021 NTSTATUS
2022 AFSShareWrite( IN PDEVICE_OBJECT DeviceObject,
2023                IN PIRP Irp)
2024 {
2025
2026     UNREFERENCED_PARAMETER(DeviceObject);
2027     NTSTATUS ntStatus = STATUS_SUCCESS;
2028     PIO_STACK_LOCATION pIrpSp = IoGetCurrentIrpStackLocation( Irp);
2029     AFSFcb *pFcb = NULL;
2030     AFSCcb *pCcb = NULL;
2031     AFSPipeIORequestCB *pIoRequest = NULL;
2032     void *pBuffer = NULL;
2033     AFSPipeIOResultCB stIoResult;
2034     ULONG ulBytesReturned = 0;
2035
2036     __Enter
2037     {
2038
2039         pFcb = (AFSFcb *)pIrpSp->FileObject->FsContext;
2040
2041         pCcb = (AFSCcb *)pIrpSp->FileObject->FsContext2;
2042
2043         AFSDbgTrace(( AFS_SUBSYSTEM_PIPE_PROCESSING,
2044                       AFS_TRACE_LEVEL_VERBOSE,
2045                       "AFSShareWrite On pipe %wZ Length %08lX\n",
2046                       &pCcb->DirectoryCB->NameInformation.FileName,
2047                       pIrpSp->Parameters.Write.Length));
2048
2049         if( pIrpSp->Parameters.Write.Length == 0)
2050         {
2051
2052             //
2053             // Nothing to do in this case
2054             //
2055
2056             try_return( ntStatus);
2057         }
2058
2059         //
2060         // Retrieve the buffer for the read request
2061         //
2062
2063         pBuffer = AFSLockSystemBuffer( Irp,
2064                                        pIrpSp->Parameters.Write.Length);
2065
2066         if( pBuffer == NULL)
2067         {
2068
2069             AFSDbgTrace(( AFS_SUBSYSTEM_PIPE_PROCESSING,
2070                           AFS_TRACE_LEVEL_ERROR,
2071                           "AFSShareWrite Failed to map buffer on pipe %wZ\n",
2072                           &pCcb->DirectoryCB->NameInformation.FileName));
2073
2074             try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES);
2075         }
2076
2077         AFSAcquireShared( &pFcb->NPFcb->Resource,
2078                           TRUE);
2079
2080         pIoRequest = (AFSPipeIORequestCB *)AFSExAllocatePoolWithTag( PagedPool,
2081                                                                      sizeof( AFSPipeIORequestCB) +
2082                                                                                 pIrpSp->Parameters.Write.Length,
2083                                                                      AFS_GENERIC_MEMORY_14_TAG);
2084
2085         if( pIoRequest == NULL)
2086         {
2087
2088             try_return( ntStatus = STATUS_INSUFFICIENT_RESOURCES);
2089         }
2090
2091         RtlZeroMemory( pIoRequest,
2092                        sizeof( AFSPipeIORequestCB) + pIrpSp->Parameters.Write.Length);
2093
2094         pIoRequest->RequestId = pCcb->RequestID;
2095
2096         pIoRequest->RootId = pFcb->ObjectInformation->VolumeCB->ObjectInformation.FileId;
2097
2098         pIoRequest->BufferLength = pIrpSp->Parameters.Write.Length;
2099
2100         RtlCopyMemory( (void *)((char *)pIoRequest + sizeof( AFSPipeIORequestCB)),
2101                        pBuffer,
2102                        pIrpSp->Parameters.Write.Length);
2103
2104         stIoResult.BytesProcessed = 0;
2105
2106         ulBytesReturned = sizeof( AFSPipeIOResultCB);
2107
2108         //
2109         // Issue the open request to the service
2110         //
2111
2112         ntStatus = AFSProcessRequest( AFS_REQUEST_TYPE_PIPE_WRITE,
2113                                       AFS_REQUEST_FLAG_SYNCHRONOUS,
2114                                       &pCcb->AuthGroup,
2115                                       &pCcb->DirectoryCB->NameInformation.FileName,
2116                                       NULL,
2117                                       NULL,
2118                                       0,
2119                                       pIoRequest,
2120                                       sizeof( AFSPipeIORequestCB) +
2121                                                 pIrpSp->Parameters.Write.Length,
2122                                       &stIoResult,
2123                                       &ulBytesReturned);
2124
2125         if( !NT_SUCCESS( ntStatus))
2126         {
2127
2128             AFSDbgTrace(( AFS_SUBSYSTEM_FILE_PROCESSING,
2129                           AFS_TRACE_LEVEL_ERROR,
2130                           "AFSShareWrite (%p) Failed service write Status %08lX\n",
2131                           Irp,
2132                           ntStatus));
2133
2134             try_return( ntStatus);
2135         }
2136
2137         AFSDbgTrace(( AFS_SUBSYSTEM_PIPE_PROCESSING,
2138                       AFS_TRACE_LEVEL_VERBOSE,
2139                       "AFSShareWrite Completed on pipe %wZ Length read %08lX\n",
2140                       &pCcb->DirectoryCB->NameInformation.FileName,
2141                       stIoResult.BytesProcessed));
2142
2143         Irp->IoStatus.Information = stIoResult.BytesProcessed;
2144
2145 try_exit:
2146
2147         if( pFcb != NULL)
2148         {
2149
2150             AFSReleaseResource( &pFcb->NPFcb->Resource);
2151         }
2152
2153         if( pIoRequest != NULL)
2154         {
2155
2156             AFSExFreePoolWithTag( pIoRequest, AFS_GENERIC_MEMORY_14_TAG);
2157         }
2158     }
2159
2160     return ntStatus;
2161 }