ReactOS  0.4.15-dev-2531-g03e8246
create.c
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1 /*++
2 
3 Copyright (c) 1989-2000 Microsoft Corporation
4 
5 Module Name:
6 
7  Create.c
8 
9 Abstract:
10 
11  This module implements the File Create routine for Fat called by the
12  dispatch driver.
13 
14 
15 --*/
16 
17 #include "fatprocs.h"
18 
19 //
20 // The Bug check file id for this module
21 //
22 
23 #define BugCheckFileId (FAT_BUG_CHECK_CREATE)
24 
25 //
26 // The debug trace level
27 //
28 
29 #define Dbg (DEBUG_TRACE_CREATE)
30 
31 
32 //
33 // Macros for incrementing performance counters.
34 //
35 
36 #define CollectCreateHitStatistics(VCB) { \
37  PFILE_SYSTEM_STATISTICS Stats = &(VCB)->Statistics[KeGetCurrentProcessorNumber() % FatData.NumberProcessors]; \
38  Stats->Fat.CreateHits += 1; \
39 }
40 
41 #define CollectCreateStatistics(VCB,STATUS) { \
42  PFILE_SYSTEM_STATISTICS Stats = &(VCB)->Statistics[KeGetCurrentProcessorNumber() % FatData.NumberProcessors]; \
43  if ((STATUS) == STATUS_SUCCESS) { \
44  Stats->Fat.SuccessfulCreates += 1; \
45  } else { \
46  Stats->Fat.FailedCreates += 1; \
47  } \
48 }
49 
50 LUID FatSecurityPrivilege = { SE_SECURITY_PRIVILEGE, 0 };
51 
52 //
53 // local procedure prototypes
54 //
55 
56 _Requires_lock_held_(_Global_critical_region_)
57 IO_STATUS_BLOCK
58 FatOpenVolume (
59  _In_ PIRP_CONTEXT IrpContext,
60  _Inout_ PFILE_OBJECT FileObject,
61  _Inout_ PVCB Vcb,
62  _In_ PACCESS_MASK DesiredAccess,
63  _In_ USHORT ShareAccess,
64  _In_ ULONG CreateDisposition
65  );
66 
67 _Requires_lock_held_(_Global_critical_region_)
68 IO_STATUS_BLOCK
69 FatOpenRootDcb (
70  _In_ PIRP_CONTEXT IrpContext,
71  _Inout_ PFILE_OBJECT FileObject,
72  _Inout_ PVCB Vcb,
73  _In_ PACCESS_MASK DesiredAccess,
74  _In_ USHORT ShareAccess,
75  _In_ ULONG CreateDisposition
76  );
77 
78 _Requires_lock_held_(_Global_critical_region_)
79 IO_STATUS_BLOCK
80 FatOpenExistingDcb (
81  _In_ PIRP_CONTEXT IrpContext,
82  _In_ PIO_STACK_LOCATION IrpSp,
83  _Inout_ PFILE_OBJECT FileObject,
84  _Inout_ PVCB Vcb,
85  _Inout_ PDCB Dcb,
86  _In_ PACCESS_MASK DesiredAccess,
87  _In_ USHORT ShareAccess,
88  _In_ ULONG CreateDisposition,
89  _In_ BOOLEAN NoEaKnowledge,
90  _In_ BOOLEAN DeleteOnClose,
91  _In_ BOOLEAN OpenRequiringOplock,
92  _In_ BOOLEAN FileNameOpenedDos,
93  _Out_ PBOOLEAN OplockPostIrp
94  );
95 
96 _Requires_lock_held_(_Global_critical_region_)
97 IO_STATUS_BLOCK
98 FatOpenExistingFcb (
99  _In_ PIRP_CONTEXT IrpContext,
100  _In_ PIO_STACK_LOCATION IrpSp,
101  _Inout_ PFILE_OBJECT FileObject,
102  _Inout_ PVCB Vcb,
103  _Inout_ PFCB Fcb,
104  _In_ PACCESS_MASK DesiredAccess,
105  _In_ USHORT ShareAccess,
106  _In_ ULONG AllocationSize,
107  _In_ PFILE_FULL_EA_INFORMATION EaBuffer,
108  _In_ ULONG EaLength,
109  _In_ USHORT FileAttributes,
110  _In_ ULONG CreateDisposition,
111  _In_ BOOLEAN NoEaKnowledge,
112  _In_ BOOLEAN DeleteOnClose,
113  _In_ BOOLEAN OpenRequiringOplock,
114  _In_ BOOLEAN FileNameOpenedDos,
115  _Out_ PBOOLEAN OplockPostIrp
116  );
117 
118 _Requires_lock_held_(_Global_critical_region_)
119 IO_STATUS_BLOCK
120 FatOpenTargetDirectory (
121  _In_ PIRP_CONTEXT IrpContext,
122  _Inout_ PFILE_OBJECT FileObject,
123  _Inout_ PDCB Dcb,
124  _In_ PACCESS_MASK DesiredAccess,
125  _In_ USHORT ShareAccess,
126  _In_ BOOLEAN DoesNameExist,
127  _In_ BOOLEAN FileNameOpenedDos
128  );
129 
130 _Success_(return.Status == STATUS_SUCCESS)
131 _Requires_lock_held_(_Global_critical_region_)
132 IO_STATUS_BLOCK
133 FatOpenExistingDirectory (
134  _In_ PIRP_CONTEXT IrpContext,
135  _In_ PIO_STACK_LOCATION IrpSp,
136  _Inout_ PFILE_OBJECT FileObject,
137  _Inout_ PVCB Vcb,
138  _Outptr_result_maybenull_ PDCB *Dcb,
139  _In_ PDCB ParentDcb,
140  _In_ PDIRENT Dirent,
141  _In_ ULONG LfnByteOffset,
142  _In_ ULONG DirentByteOffset,
143  _In_ PUNICODE_STRING Lfn,
144  _In_ PACCESS_MASK DesiredAccess,
145  _In_ USHORT ShareAccess,
146  _In_ ULONG CreateDisposition,
147  _In_ BOOLEAN NoEaKnowledge,
148  _In_ BOOLEAN DeleteOnClose,
149  _In_ BOOLEAN FileNameOpenedDos,
150  _In_ BOOLEAN OpenRequiringOplock
151  );
152 
153 _Requires_lock_held_(_Global_critical_region_)
154 IO_STATUS_BLOCK
155 FatOpenExistingFile (
156  _In_ PIRP_CONTEXT IrpContext,
157  _Inout_ PFILE_OBJECT FileObject,
158  _Inout_ PVCB Vcb,
159  _Outptr_result_maybenull_ PFCB *Fcb,
160  _In_ PDCB ParentDcb,
161  _In_ PDIRENT Dirent,
162  _In_ ULONG LfnByteOffset,
163  _In_ ULONG DirentByteOffset,
164  _In_ PUNICODE_STRING Lfn,
165  _In_ PUNICODE_STRING OrigLfn,
166  _In_ PACCESS_MASK DesiredAccess,
167  _In_ USHORT ShareAccess,
168  _In_ ULONG AllocationSize,
169  _In_ PFILE_FULL_EA_INFORMATION EaBuffer,
170  _In_ ULONG EaLength,
171  _In_ USHORT FileAttributes,
172  _In_ ULONG CreateDisposition,
173  _In_ BOOLEAN IsPagingFile,
174  _In_ BOOLEAN NoEaKnowledge,
175  _In_ BOOLEAN DeleteOnClose,
176  _In_ BOOLEAN OpenRequiringOplock,
177  _In_ BOOLEAN FileNameOpenedDos
178  );
179 
180 _Requires_lock_held_(_Global_critical_region_)
181 IO_STATUS_BLOCK
182 FatCreateNewDirectory (
183  _In_ PIRP_CONTEXT IrpContext,
184  _In_ PIO_STACK_LOCATION IrpSp,
185  _Inout_ PFILE_OBJECT FileObject,
186  _Inout_ PVCB Vcb,
187  _Inout_ PDCB ParentDcb,
188  _In_ POEM_STRING OemName,
189  _In_ PUNICODE_STRING UnicodeName,
190  _In_ PACCESS_MASK DesiredAccess,
191  _In_ USHORT ShareAccess,
192  _In_ PFILE_FULL_EA_INFORMATION EaBuffer,
193  _In_ ULONG EaLength,
194  _In_ USHORT FileAttributes,
195  _In_ BOOLEAN NoEaKnowledge,
196  _In_ BOOLEAN DeleteOnClose,
197  _In_ BOOLEAN OpenRequiringOplock
198  );
199 
200 _Requires_lock_held_(_Global_critical_region_)
201 IO_STATUS_BLOCK
202 FatCreateNewFile (
203  _In_ PIRP_CONTEXT IrpContext,
204  _In_ PIO_STACK_LOCATION IrpSp,
205  _Inout_ PFILE_OBJECT FileObject,
206  _Inout_ PVCB Vcb,
207  _Inout_ PDCB ParentDcb,
208  _In_ POEM_STRING OemName,
209  _In_ PUNICODE_STRING UnicodeName,
210  _In_ PACCESS_MASK DesiredAccess,
211  _In_ USHORT ShareAccess,
212  _In_ ULONG AllocationSize,
213  _In_ PFILE_FULL_EA_INFORMATION EaBuffer,
214  _In_ ULONG EaLength,
215  _In_ USHORT FileAttributes,
216  _In_ PUNICODE_STRING LfnBuffer,
217  _In_ BOOLEAN IsPagingFile,
218  _In_ BOOLEAN NoEaKnowledge,
219  _In_ BOOLEAN DeleteOnClose,
220  _In_ BOOLEAN OpenRequiringOplock,
221  _In_ BOOLEAN TemporaryFile
222  );
223 
224 
225 _Requires_lock_held_(_Global_critical_region_)
226 IO_STATUS_BLOCK
227 FatSupersedeOrOverwriteFile (
228  _In_ PIRP_CONTEXT IrpContext,
229  _Inout_ PFILE_OBJECT FileObject,
230  _Inout_ PFCB Fcb,
231  _In_ ULONG AllocationSize,
232  _In_ PFILE_FULL_EA_INFORMATION EaBuffer,
233  _In_ ULONG EaLength,
234  _In_ USHORT FileAttributes,
235  _In_ ULONG CreateDisposition,
236  _In_ BOOLEAN NoEaKnowledge
237  );
238 
239 NTSTATUS
240 FatCheckSystemSecurityAccess (
241  _In_ PIRP_CONTEXT IrpContext
242  );
243 
244 NTSTATUS
245 FatCheckShareAccess (
246  _In_ PIRP_CONTEXT IrpContext,
247  _In_ PFILE_OBJECT FileObject,
248  _In_ PFCB Fcb,
249  _In_ PACCESS_MASK DesiredAccess,
250  _In_ ULONG ShareAccess
251  );
252 
253 #ifdef ALLOC_PRAGMA
254 #pragma alloc_text(PAGE, FatCheckShareAccess)
255 #pragma alloc_text(PAGE, FatCheckSystemSecurityAccess)
256 #pragma alloc_text(PAGE, FatCommonCreate)
257 
258 #if (NTDDI_VERSION >= NTDDI_WINTHRESHOLD)
259 #pragma alloc_text(PAGE, FatCommonCreateOnNewStack)
260 #pragma alloc_text(PAGE, FatCommonCreateCallout)
261 #endif
262 
263 #pragma alloc_text(PAGE, FatCreateNewDirectory)
264 #pragma alloc_text(PAGE, FatCreateNewFile)
265 #pragma alloc_text(PAGE, FatFsdCreate)
266 #pragma alloc_text(PAGE, FatOpenExistingDcb)
267 #pragma alloc_text(PAGE, FatOpenExistingDirectory)
268 #pragma alloc_text(PAGE, FatOpenExistingFcb)
269 #pragma alloc_text(PAGE, FatOpenExistingFile)
270 #pragma alloc_text(PAGE, FatOpenRootDcb)
271 #pragma alloc_text(PAGE, FatOpenTargetDirectory)
272 #pragma alloc_text(PAGE, FatOpenVolume)
273 #pragma alloc_text(PAGE, FatSupersedeOrOverwriteFile)
274 #pragma alloc_text(PAGE, FatSetFullNameInFcb)
275 #endif
276 
277 
278 _Function_class_(IRP_MJ_CREATE)
279 _Function_class_(DRIVER_DISPATCH)
280 NTSTATUS
281 NTAPI
282 FatFsdCreate (
283  _In_ PVOLUME_DEVICE_OBJECT VolumeDeviceObject,
284  _Inout_ PIRP Irp
285  )
286 
287 /*++
288 
289 Routine Description:
290 
291  This routine implements the FSD part of the NtCreateFile and NtOpenFile
292  API calls.
293 
294 Arguments:
295 
296  VolumeDeviceObject - Supplies the volume device object where the
297  file/directory exists that we are trying to open/create
298 
299  Irp - Supplies the Irp being processed
300 
301 Return Value:
302 
303  NTSTATUS - The Fsd status for the Irp
304 
305 --*/
306 
307 {
308  NTSTATUS Status;
309  PIRP_CONTEXT IrpContext = NULL;
310 
311  BOOLEAN TopLevel;
312  BOOLEAN ExceptionCompletedIrp = FALSE;
313 
314 
315  PAGED_CODE();
316 
317  //
318  // If we were called with our file system device object instead of a
319  // volume device object, just complete this request with STATUS_SUCCESS
320  //
321 
322  if ( FatDeviceIsFatFsdo( VolumeDeviceObject)) {
323 
324  Irp->IoStatus.Status = STATUS_SUCCESS;
325  Irp->IoStatus.Information = FILE_OPENED;
326 
327  IoCompleteRequest( Irp, IO_DISK_INCREMENT );
328 
329  return STATUS_SUCCESS;
330  }
331 
332  TimerStart(Dbg);
333 
334  DebugTrace(+1, Dbg, "FatFsdCreate\n", 0);
335 
336  //
337  // Call the common create routine, with block allowed if the operation
338  // is synchronous.
339  //
340 
341  FsRtlEnterFileSystem();
342 
343  TopLevel = FatIsIrpTopLevel( Irp );
344 
345  _SEH2_TRY {
346 
347  IrpContext = FatCreateIrpContext( Irp, TRUE );
348 
349 #if (NTDDI_VERSION >= NTDDI_WINTHRESHOLD)
350  Status = FatCommonCreateOnNewStack( IrpContext, Irp );
351 #else
352  Status = FatCommonCreate( IrpContext, Irp );
353 #endif
354 
355  } _SEH2_EXCEPT(FatExceptionFilter( IrpContext, _SEH2_GetExceptionInformation() )) {
356 
357  //
358  // We had some trouble trying to perform the requested
359  // operation, so we'll abort the I/O request with
360  // the error status that we get back from the
361  // execption code
362  //
363 
364  Status = FatProcessException( IrpContext, Irp, _SEH2_GetExceptionCode() );
365  ExceptionCompletedIrp = TRUE;
366  } _SEH2_END;
367 
368  if (TopLevel) { IoSetTopLevelIrp( NULL ); }
369 
370  FsRtlExitFileSystem();
371 
372 
373  //
374  // Complete the request, unless we had an exception, in which case it
375  // was completed in FatProcessException (and the IrpContext freed).
376  //
377  // IrpContext is freed inside FatCompleteRequest.
378  //
379 
380  if (!ExceptionCompletedIrp && Status != STATUS_PENDING) {
381  FatCompleteRequest( IrpContext, Irp, Status );
382  }
383 
384  //
385  // And return to our caller
386  //
387 
388  DebugTrace(-1, Dbg, "FatFsdCreate -> %08lx\n", Status );
389 
390  TimerStop(Dbg,"FatFsdCreate");
391 
392  UNREFERENCED_PARAMETER( VolumeDeviceObject );
393 
394  return Status;
395 }
396 
397 #if (NTDDI_VERSION >= NTDDI_WINTHRESHOLD)
398 _Requires_lock_held_(_Global_critical_region_)
399 VOID
400 FatCommonCreateCallout (
401  _In_ PFAT_CALLOUT_PARAMETERS CalloutParameters
402  )
403 
404 /*++
405 
406 Routine Description:
407 
408  This function is the callout routine that will execute on a new stack when
409  processing a create. It simply calls FatCommonCreate() with the parameters
410  in the context and stores the return value in the context.
411 
412 Arguments:
413 
414  Context - Supplies an opaque pointer to this function's context. It is actually
415  an FAT_CALLOUT_PARAMETERS structure.
416 
417 Return Value:
418 
419  None.
420 
421 --*/
422 
423 {
424  PAGED_CODE();
425 
426  //
427  // Call FatCommonCreate() with the passed parameters and store the result.
428  // Exceptions cannot be raised across stack boundaries, so we need to catch
429  // exceptions here and deal with them.
430  //
431 
432  try {
433 
434  CalloutParameters->IrpStatus = FatCommonCreate( CalloutParameters->Create.IrpContext,
435  CalloutParameters->Create.Irp );
436 
437  } except (FatExceptionFilter( CalloutParameters->Create.IrpContext, GetExceptionInformation() )) {
438 
439  //
440  // Return the resulting status.
441  //
442 
443  CalloutParameters->ExceptionStatus = GetExceptionCode();
444  }
445 
446 }
447 
448 
449 _Requires_lock_held_(_Global_critical_region_)
450 NTSTATUS
451 FatCommonCreateOnNewStack (
452  _In_ PIRP_CONTEXT IrpContext,
453  _In_ PIRP Irp
454  )
455 
456 /*++
457 
458 Routine Description:
459 
460  This routine sets up a switch to a new stack and call to FatCommonCreate().
461 
462 Arguments:
463 
464  IrpContext - Supplies the context structure for the overall request.
465 
466  Irp - Supplies the IRP being processed.
467 
468  CreateContext - Supplies a pointer on the old stack that is used to
469  store context information for the create itself.
470 
471 Return Value:
472 
473  NTSTATUS - The status from FatCommonCreate().
474 
475 --*/
476 {
477  FAT_CALLOUT_PARAMETERS CalloutParameters;
478  NTSTATUS status;
479 
480  PAGED_CODE();
481 
482  //
483  // Create requests consume a lot of stack space. As such, we always switch to a
484  // new stack when processing a create. Setup the callout parameters and make the
485  // call. Note that this cannot fail, since we pass a stack context for a reserve stack.
486  //
487 
488  CalloutParameters.Create.IrpContext = IrpContext;
489  CalloutParameters.Create.Irp = Irp;
490  CalloutParameters.ExceptionStatus = CalloutParameters.IrpStatus = STATUS_SUCCESS;
491 
492  //
493  // Mark that we are swapping the stack
494  //
495 
496  SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_SWAPPED_STACK );
497 
498  status = KeExpandKernelStackAndCalloutEx( FatCommonCreateCallout,
499  &CalloutParameters,
500  KERNEL_STACK_SIZE,
501  FALSE,
502  NULL );
503 
504  //
505  // Mark that the stack is no longer swapped. Note that there are paths
506  // that may clear this flag before returning.
507  //
508 
509  if (status != STATUS_PENDING) {
510 
511  ClearFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_SWAPPED_STACK );
512  }
513 
514  //
515  // If we had an exception occur, re-raise the exception.
516  //
517 
518  if (!NT_SUCCESS( CalloutParameters.ExceptionStatus )) {
519  FatRaiseStatus( IrpContext, CalloutParameters.ExceptionStatus );
520  }
521 
522  //
523  // If the call to KeExpandKernelStackAndCalloutEx returns an error this
524  // means that the callout routine (FatCommonCreateCallout) was never
525  // called. Translate that error, and return it.
526  //
527 
528  if (!NT_SUCCESS( status )) {
529 
530  //
531  // Translate to an expected error value
532  //
533 
534  if (status == STATUS_NO_MEMORY) {
535 
536  status = STATUS_INSUFFICIENT_RESOURCES;
537  }
538 
539  return status;
540  }
541 
542  //
543  // Return the status given to us by the callout.
544  //
545 
546  return CalloutParameters.IrpStatus;
547 }
548 #endif
549 
550 _Requires_lock_held_(_Global_critical_region_)
551 NTSTATUS
552 FatCommonCreate (
553  _Inout_ PIRP_CONTEXT IrpContext,
554  _Inout_ PIRP Irp
555  )
556 
557 /*++
558 
559 Routine Description:
560 
561  This is the common routine for creating/opening a file called by
562  both the fsd and fsp threads.
563 
564 Arguments:
565 
566  Irp - Supplies the Irp to process
567 
568 Return Value:
569 
570  NTSTATUS - the return status for the operation
571 
572 --*/
573 
574 {
575  NTSTATUS Status;
576  IO_STATUS_BLOCK Iosb = {0};
577  PIO_STACK_LOCATION IrpSp;
578 
579  PFILE_OBJECT FileObject;
580  PFILE_OBJECT RelatedFileObject;
581  UNICODE_STRING FileName;
582  ULONG AllocationSize;
583  PFILE_FULL_EA_INFORMATION EaBuffer;
584  PACCESS_MASK DesiredAccess;
585  ULONG Options;
586  USHORT FileAttributes;
587  USHORT ShareAccess;
588  ULONG EaLength;
589 
590  BOOLEAN CreateDirectory;
591  BOOLEAN NoIntermediateBuffering;
592  BOOLEAN OpenDirectory;
593  BOOLEAN IsPagingFile;
594  BOOLEAN OpenTargetDirectory;
595  BOOLEAN DirectoryFile;
596  BOOLEAN NonDirectoryFile;
597  BOOLEAN NoEaKnowledge;
598  BOOLEAN DeleteOnClose;
599  BOOLEAN OpenRequiringOplock;
600  BOOLEAN TemporaryFile;
601  BOOLEAN FileNameOpenedDos = FALSE;
602 
603  ULONG CreateDisposition;
604 
605  PVCB Vcb;
606  PFCB Fcb = NULL;
607  PCCB Ccb;
608  PDCB ParentDcb;
609  PDCB FinalDcb = NULL;
610 
611  UNICODE_STRING FinalName = {0};
612  UNICODE_STRING RemainingPart;
613  UNICODE_STRING NextRemainingPart = {0};
614  UNICODE_STRING UpcasedFinalName;
615  WCHAR UpcasedBuffer[ FAT_CREATE_INITIAL_NAME_BUF_SIZE];
616 
617  OEM_STRING OemFinalName;
618  UCHAR OemBuffer[ FAT_CREATE_INITIAL_NAME_BUF_SIZE*2];
619 
620  PDIRENT Dirent;
621  PBCB DirentBcb = NULL;
622  ULONG LfnByteOffset;
623  ULONG DirentByteOffset;
624 
625  BOOLEAN PostIrp = FALSE;
626  BOOLEAN OplockPostIrp = FALSE;
627  BOOLEAN TrailingBackslash;
628  BOOLEAN FirstLoop = TRUE;
629 
630  ULONG MatchFlags = 0;
631 
632  CCB LocalCcb;
633  UNICODE_STRING Lfn;
634  UNICODE_STRING OrigLfn = {0};
635 
636  WCHAR LfnBuffer[ FAT_CREATE_INITIAL_NAME_BUF_SIZE];
637 
638  PAGED_CODE();
639 
640  //
641  // Get the current IRP stack location
642  //
643 
644  IrpSp = IoGetCurrentIrpStackLocation( Irp );
645 
646  DebugTrace(+1, Dbg, "FatCommonCreate\n", 0 );
647  DebugTrace( 0, Dbg, "Irp = %p\n", Irp );
648  DebugTrace( 0, Dbg, "->Flags = %08lx\n", Irp->Flags );
649  DebugTrace( 0, Dbg, "->FileObject = %p\n", IrpSp->FileObject );
650  DebugTrace( 0, Dbg, " ->RelatedFileObject = %p\n", IrpSp->FileObject->RelatedFileObject );
651  DebugTrace( 0, Dbg, " ->FileName = %wZ\n", &IrpSp->FileObject->FileName );
652  DebugTrace( 0, Dbg, " ->FileName.Length = 0n%d\n", IrpSp->FileObject->FileName.Length );
653  DebugTrace( 0, Dbg, "->AllocationSize.LowPart = %08lx\n", Irp->Overlay.AllocationSize.LowPart );
654  DebugTrace( 0, Dbg, "->AllocationSize.HighPart = %08lx\n", Irp->Overlay.AllocationSize.HighPart );
655  DebugTrace( 0, Dbg, "->SystemBuffer = %p\n", Irp->AssociatedIrp.SystemBuffer );
656  DebugTrace( 0, Dbg, "->DesiredAccess = %08lx\n", IrpSp->Parameters.Create.SecurityContext->DesiredAccess );
657  DebugTrace( 0, Dbg, "->Options = %08lx\n", IrpSp->Parameters.Create.Options );
658  DebugTrace( 0, Dbg, "->FileAttributes = %04x\n", IrpSp->Parameters.Create.FileAttributes );
659  DebugTrace( 0, Dbg, "->ShareAccess = %04x\n", IrpSp->Parameters.Create.ShareAccess );
660  DebugTrace( 0, Dbg, "->EaLength = %08lx\n", IrpSp->Parameters.Create.EaLength );
661 
662  //
663  // This is here because the Win32 layer can't avoid sending me double
664  // beginning backslashes.
665  //
666 
667  if ((IrpSp->FileObject->FileName.Length > sizeof(WCHAR)) &&
668  (IrpSp->FileObject->FileName.Buffer[1] == L'\\') &&
669  (IrpSp->FileObject->FileName.Buffer[0] == L'\\')) {
670 
671  IrpSp->FileObject->FileName.Length -= sizeof(WCHAR);
672 
673  RtlMoveMemory( &IrpSp->FileObject->FileName.Buffer[0],
674  &IrpSp->FileObject->FileName.Buffer[1],
675  IrpSp->FileObject->FileName.Length );
676 
677  //
678  // If there are still two beginning backslashes, the name is bogus.
679  //
680 
681  if ((IrpSp->FileObject->FileName.Length > sizeof(WCHAR)) &&
682  (IrpSp->FileObject->FileName.Buffer[1] == L'\\') &&
683  (IrpSp->FileObject->FileName.Buffer[0] == L'\\')) {
684 
685  DebugTrace(-1, Dbg, "FatCommonCreate -> STATUS_OBJECT_NAME_INVALID\n", 0);
686  return STATUS_OBJECT_NAME_INVALID;
687  }
688  }
689 
690  //
691  // Reference our input parameters to make things easier
692  //
693 
694  NT_ASSERT( IrpSp->Parameters.Create.SecurityContext != NULL );
695 
696  FileObject = IrpSp->FileObject;
697  FileName = FileObject->FileName;
698  RelatedFileObject = FileObject->RelatedFileObject;
699  AllocationSize = Irp->Overlay.AllocationSize.LowPart;
700  EaBuffer = Irp->AssociatedIrp.SystemBuffer;
701  DesiredAccess = &IrpSp->Parameters.Create.SecurityContext->DesiredAccess;
702  Options = IrpSp->Parameters.Create.Options;
703  FileAttributes = IrpSp->Parameters.Create.FileAttributes & ~FILE_ATTRIBUTE_NORMAL;
704  ShareAccess = IrpSp->Parameters.Create.ShareAccess;
705  EaLength = IrpSp->Parameters.Create.EaLength;
706 
707  //
708  // Set up the file object's Vpb pointer in case anything happens.
709  // This will allow us to get a reasonable pop-up.
710  //
711 
712  if ( RelatedFileObject != NULL ) {
713  FileObject->Vpb = RelatedFileObject->Vpb;
714  }
715 
716  //
717  // Force setting the archive bit in the attributes byte to follow OS/2,
718  // & DOS semantics. Also mask out any extraneous bits, note that
719  // we can't use the ATTRIBUTE_VALID_FLAGS constant because that has
720  // the control and normal flags set.
721  //
722  // Delay setting ARCHIVE in case this is a directory: 2/16/95
723  //
724 
725  FileAttributes &= (FILE_ATTRIBUTE_READONLY |
726  FILE_ATTRIBUTE_HIDDEN |
727  FILE_ATTRIBUTE_SYSTEM |
728  FILE_ATTRIBUTE_ARCHIVE |
729  FILE_ATTRIBUTE_ENCRYPTED);
730 
731  //
732  // Locate the volume device object and Vcb that we are trying to access
733  //
734 
735  Vcb = &((PVOLUME_DEVICE_OBJECT)IrpSp->DeviceObject)->Vcb;
736 
737  //
738  // Decipher Option flags and values
739  //
740 
741  //
742  // If this is an open by fileid operation, just fail it explicitly. FAT's
743  // source of fileids is not reversible for open operations.
744  //
745 
746  if (BooleanFlagOn( Options, FILE_OPEN_BY_FILE_ID )) {
747 
748  return STATUS_NOT_IMPLEMENTED;
749  }
750 
751  DirectoryFile = BooleanFlagOn( Options, FILE_DIRECTORY_FILE );
752  NonDirectoryFile = BooleanFlagOn( Options, FILE_NON_DIRECTORY_FILE );
753  NoIntermediateBuffering = BooleanFlagOn( Options, FILE_NO_INTERMEDIATE_BUFFERING );
754  NoEaKnowledge = BooleanFlagOn( Options, FILE_NO_EA_KNOWLEDGE );
755  DeleteOnClose = BooleanFlagOn( Options, FILE_DELETE_ON_CLOSE );
756 #if (NTDDI_VERSION >= NTDDI_WIN7)
757  OpenRequiringOplock = BooleanFlagOn( Options, FILE_OPEN_REQUIRING_OPLOCK );
758 #else
759  OpenRequiringOplock = FALSE;
760 #endif
761 
762  TemporaryFile = BooleanFlagOn( IrpSp->Parameters.Create.FileAttributes,
763  FILE_ATTRIBUTE_TEMPORARY );
764 
765  CreateDisposition = (Options >> 24) & 0x000000ff;
766 
767  IsPagingFile = BooleanFlagOn( IrpSp->Flags, SL_OPEN_PAGING_FILE );
768  OpenTargetDirectory = BooleanFlagOn( IrpSp->Flags, SL_OPEN_TARGET_DIRECTORY );
769 
770  CreateDirectory = (BOOLEAN)(DirectoryFile &&
771  ((CreateDisposition == FILE_CREATE) ||
772  (CreateDisposition == FILE_OPEN_IF)));
773 
774  OpenDirectory = (BOOLEAN)(DirectoryFile &&
775  ((CreateDisposition == FILE_OPEN) ||
776  (CreateDisposition == FILE_OPEN_IF)));
777 
778 
779  //
780  // Make sure the input large integer is valid and that the dir/nondir
781  // indicates a storage type we understand.
782  //
783 
784  if (Irp->Overlay.AllocationSize.HighPart != 0 ||
785  (DirectoryFile && NonDirectoryFile)) {
786 
787  DebugTrace(-1, Dbg, "FatCommonCreate -> STATUS_INVALID_PARAMETER\n", 0);
788  return STATUS_INVALID_PARAMETER;
789  }
790 
791  //
792  // Acquire exclusive access to the vcb, and enqueue the Irp if
793  // we didn't get it.
794  //
795 
796  if (!FatAcquireExclusiveVcb( IrpContext, Vcb )) {
797 
798  DebugTrace(0, Dbg, "Cannot acquire Vcb\n", 0);
799 
800  Iosb.Status = FatFsdPostRequest( IrpContext, Irp );
801 
802  DebugTrace(-1, Dbg, "FatCommonCreate -> %08lx\n", Iosb.Status );
803  return Iosb.Status;
804  }
805 
806  //
807  // Make sure we haven't been called recursively by a filter inside an existing
808  // create request.
809  //
810 
811  if (FlagOn( Vcb->VcbState, VCB_STATE_FLAG_CREATE_IN_PROGRESS)) {
812 
813 #ifdef _MSC_VER
814 #pragma prefast( suppress:28159, "this is a serious programming error if it happens" )
815 #endif
816  FatBugCheck( 0, 0, 0);
817  }
818 
819  //
820  // Initialize the DirentBcb to null
821  //
822 
823  DirentBcb = NULL;
824 
825  //
826  // Initialize our temp strings with their stack buffers.
827  //
828 
829  OemFinalName.Length = 0;
830  OemFinalName.MaximumLength = sizeof( OemBuffer);
831  OemFinalName.Buffer = (PCHAR)OemBuffer;
832 
833  UpcasedFinalName.Length = 0;
834  UpcasedFinalName.MaximumLength = sizeof( UpcasedBuffer);
835  UpcasedFinalName.Buffer = UpcasedBuffer;
836 
837  Lfn.Length = 0;
838  Lfn.MaximumLength = sizeof( LfnBuffer);
839  Lfn.Buffer = LfnBuffer;
840 
841  _SEH2_TRY {
842 
843  //
844  // Make sure the vcb is in a usable condition. This will raise
845  // and error condition if the volume is unusable
846  //
847 
848  FatVerifyVcb( IrpContext, Vcb );
849 
850  //
851  // If the Vcb is locked then we cannot open another file
852  //
853 
854  if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_LOCKED)) {
855 
856  DebugTrace(0, Dbg, "Volume is locked\n", 0);
857 
858  Status = STATUS_ACCESS_DENIED;
859  if (Vcb->VcbCondition != VcbGood) {
860 
861  Status = STATUS_VOLUME_DISMOUNTED;
862  }
863  try_return( Iosb.Status = Status );
864  }
865 
866  //
867  // Don't allow the DELETE_ON_CLOSE option if the volume is
868  // write-protected.
869  //
870 
871  if (DeleteOnClose && FlagOn(Vcb->VcbState, VCB_STATE_FLAG_WRITE_PROTECTED)) {
872 
873  //
874  // Set the real device for the pop-up info, and set the verify
875  // bit in the device object, so that we will force a verify
876  // in case the user put the correct media back in.
877  //
878 
879  IoSetHardErrorOrVerifyDevice( IrpContext->OriginatingIrp,
880  Vcb->Vpb->RealDevice );
881 
882  SetFlag(Vcb->Vpb->RealDevice->Flags, DO_VERIFY_VOLUME);
883 
884  FatRaiseStatus( IrpContext, STATUS_MEDIA_WRITE_PROTECTED );
885  }
886 
887  //
888  // If this is a fat32 volume, EA's are not supported.
889  //
890 
891  if (EaBuffer != NULL) {
892 
893  try_return( Iosb.Status = STATUS_EAS_NOT_SUPPORTED );
894  }
895 
896  //
897  // Check if we are opening the volume and not a file/directory.
898  // We are opening the volume if the name is empty and there
899  // isn't a related file object. If there is a related file object
900  // then it is the Vcb itself.
901  //
902 
903  if (FileName.Length == 0) {
904 
905  PVCB DecodeVcb = NULL;
906 
907  if (RelatedFileObject == NULL ||
908  FatDecodeFileObject( RelatedFileObject,
909  &DecodeVcb,
910  &Fcb,
911  &Ccb ) == UserVolumeOpen) {
912 
913  NT_ASSERT( RelatedFileObject == NULL || Vcb == DecodeVcb );
914 
915  //
916  // Check if we were to open a directory
917  //
918 
919  if (DirectoryFile) {
920 
921  DebugTrace(0, Dbg, "Cannot open volume as a directory\n", 0);
922 
923  try_return( Iosb.Status = STATUS_NOT_A_DIRECTORY );
924  }
925 
926  //
927  // Can't open the TargetDirectory of the DASD volume.
928  //
929 
930  if (OpenTargetDirectory) {
931 
932  try_return( Iosb.Status = STATUS_INVALID_PARAMETER );
933  }
934 
935  DebugTrace(0, Dbg, "Opening the volume, Vcb = %p\n", Vcb);
936 
937  CollectCreateHitStatistics(Vcb);
938 
939  Iosb = FatOpenVolume( IrpContext,
940  FileObject,
941  Vcb,
942  DesiredAccess,
943  ShareAccess,
944  CreateDisposition );
945 
946  Irp->IoStatus.Information = Iosb.Information;
947  try_return( Iosb.Status );
948  }
949  }
950 
951  //
952  // If there is a related file object then this is a relative open.
953  // The related file object is the directory to start our search at.
954  // Return an error if it is not a directory.
955  //
956 
957  if (RelatedFileObject != NULL) {
958 
959  PVCB RelatedVcb;
960  PDCB RelatedDcb;
961  PCCB RelatedCcb;
962  TYPE_OF_OPEN TypeOfOpen;
963 
964  TypeOfOpen = FatDecodeFileObject( RelatedFileObject,
965  &RelatedVcb,
966  &RelatedDcb,
967  &RelatedCcb );
968 
969  if (TypeOfOpen != UserFileOpen &&
970  TypeOfOpen != UserDirectoryOpen) {
971 
972  DebugTrace(0, Dbg, "Invalid related file object\n", 0);
973 
974  try_return( Iosb.Status = STATUS_OBJECT_PATH_NOT_FOUND );
975  }
976 
977  //
978  // A relative open must be via a relative path.
979  //
980 
981  if (FileName.Length != 0 &&
982  FileName.Buffer[0] == L'\\') {
983 
984  try_return( Iosb.Status = STATUS_OBJECT_NAME_INVALID );
985  }
986 
987  //
988  // Set up the file object's Vpb pointer in case anything happens.
989  //
990 
991  NT_ASSERT( Vcb == RelatedVcb );
992 
993  FileObject->Vpb = RelatedFileObject->Vpb;
994 
995  //
996  // Now verify the related Fcb so we don't get in trouble later
997  // by assuming its in good shape.
998  //
999 
1000  FatVerifyFcb( IrpContext, RelatedDcb );
1001 
1002  ParentDcb = RelatedDcb;
1003 
1004  } else {
1005 
1006  //
1007  // This is not a relative open, so check if we're
1008  // opening the root dcb
1009  //
1010 
1011  if ((FileName.Length == sizeof(WCHAR)) &&
1012  (FileName.Buffer[0] == L'\\')) {
1013 
1014  //
1015  // Check if we were not supposed to open a directory
1016  //
1017 
1018  if (NonDirectoryFile) {
1019 
1020  DebugTrace(0, Dbg, "Cannot open root directory as a file\n", 0);
1021 
1022  try_return( Iosb.Status = STATUS_FILE_IS_A_DIRECTORY );
1023  }
1024 
1025  //
1026  // Can't open the TargetDirectory of the root directory.
1027  //
1028 
1029  if (OpenTargetDirectory) {
1030 
1031  try_return( Iosb.Status = STATUS_INVALID_PARAMETER );
1032  }
1033 
1034  //
1035  // Not allowed to delete root directory.
1036  //
1037 
1038  if (DeleteOnClose) {
1039 
1040  try_return( Iosb.Status = STATUS_CANNOT_DELETE );
1041  }
1042 
1043  DebugTrace(0, Dbg, "Opening root dcb\n", 0);
1044 
1045  CollectCreateHitStatistics(Vcb);
1046 
1047  Iosb = FatOpenRootDcb( IrpContext,
1048  FileObject,
1049  Vcb,
1050  DesiredAccess,
1051  ShareAccess,
1052  CreateDisposition );
1053 
1054  Irp->IoStatus.Information = Iosb.Information;
1055  try_return( Iosb.Status );
1056  }
1057 
1058  //
1059  // Nope, we will be opening relative to the root directory.
1060  //
1061 
1062  ParentDcb = Vcb->RootDcb;
1063 
1064  //
1065  // Now verify the root Dcb so we don't get in trouble later
1066  // by assuming its in good shape.
1067  //
1068 
1069  FatVerifyFcb( IrpContext, ParentDcb );
1070  }
1071 
1072  //
1073  // FatCommonCreate(): trailing backslash check
1074  //
1075 
1076 
1077  if ((FileName.Length != 0) &&
1078  (FileName.Buffer[FileName.Length/sizeof(WCHAR)-1] == L'\\')) {
1079 
1080  FileName.Length -= sizeof(WCHAR);
1081  TrailingBackslash = TRUE;
1082 
1083  } else {
1084 
1085  TrailingBackslash = FALSE;
1086  }
1087 
1088  //
1089  // Check for max path. We might want to tighten this down to DOS MAX_PATH
1090  // for maximal interchange with non-NT platforms, but for now defer to the
1091  // possibility of something depending on it.
1092  //
1093 
1094  if (ParentDcb->FullFileName.Buffer == NULL) {
1095 
1096  FatSetFullFileNameInFcb( IrpContext, ParentDcb );
1097  }
1098 
1099  if ((USHORT) (ParentDcb->FullFileName.Length + sizeof(WCHAR) + FileName.Length) <= FileName.Length) {
1100 
1101  try_return( Iosb.Status = STATUS_OBJECT_NAME_INVALID );
1102  }
1103 
1104  //
1105  // We loop here until we land on an Fcb that is in a good
1106  // condition. This way we can reopen files that have stale handles
1107  // to files of the same name but are now different.
1108  //
1109 
1110  while ( TRUE ) {
1111 
1112  Fcb = ParentDcb;
1113  RemainingPart = FileName;
1114 
1115  //
1116  // Now walk down the Dcb tree looking for the longest prefix.
1117  // This one exit condition in the while() is to handle a
1118  // special case condition (relative NULL name open), the main
1119  // exit conditions are at the bottom of the loop.
1120  //
1121 
1122  while (RemainingPart.Length != 0) {
1123 
1124  PFCB NextFcb;
1125 
1126  FsRtlDissectName( RemainingPart,
1127  &FinalName,
1128  &NextRemainingPart );
1129 
1130  //
1131  // If RemainingPart starts with a backslash the name is
1132  // invalid.
1133  // Check for no more than 255 characters in FinalName
1134  //
1135 
1136  if (((NextRemainingPart.Length != 0) && (NextRemainingPart.Buffer[0] == L'\\')) ||
1137  (FinalName.Length > 255*sizeof(WCHAR))) {
1138 
1139  try_return( Iosb.Status = STATUS_OBJECT_NAME_INVALID );
1140  }
1141 
1142  //
1143  // Now, try to convert this one component into Oem and search
1144  // the splay tree. If it works then that's great, otherwise
1145  // we have to try with the UNICODE name instead.
1146  //
1147 
1148  FatEnsureStringBufferEnough( &OemFinalName,
1149  FinalName.Length);
1150 
1151  Status = RtlUpcaseUnicodeStringToCountedOemString( &OemFinalName, &FinalName, FALSE );
1152 
1153 
1154  if (NT_SUCCESS(Status)) {
1155 
1156  NextFcb = FatFindFcb( IrpContext,
1157  &Fcb->Specific.Dcb.RootOemNode,
1158  (PSTRING)&OemFinalName,
1159  &FileNameOpenedDos );
1160 
1161  } else {
1162 
1163  NextFcb = NULL;
1164  OemFinalName.Length = 0;
1165 
1166  if (Status != STATUS_UNMAPPABLE_CHARACTER) {
1167 
1168  try_return( Iosb.Status = Status );
1169  }
1170  }
1171 
1172  //
1173  // If we didn't find anything searching the Oem space, we
1174  // have to try the Unicode space. To save cycles in the
1175  // common case that this tree is empty, we do a quick check
1176  // here.
1177  //
1178 
1179  if ((NextFcb == NULL) && Fcb->Specific.Dcb.RootUnicodeNode) {
1180 
1181  //
1182  // First downcase, then upcase the string, because this
1183  // is what happens when putting names into the tree (see
1184  // strucsup.c, FatConstructNamesInFcb()).
1185  //
1186 
1187  FatEnsureStringBufferEnough( &UpcasedFinalName,
1188  FinalName.Length);
1189 
1190  Status = RtlDowncaseUnicodeString(&UpcasedFinalName, &FinalName, FALSE );
1191  NT_ASSERT( NT_SUCCESS( Status ));
1192 
1193  Status = RtlUpcaseUnicodeString( &UpcasedFinalName, &UpcasedFinalName, FALSE );
1194  NT_ASSERT( NT_SUCCESS( Status ));
1195 
1196 
1197  NextFcb = FatFindFcb( IrpContext,
1198  &Fcb->Specific.Dcb.RootUnicodeNode,
1199  (PSTRING)&UpcasedFinalName,
1200  &FileNameOpenedDos );
1201  }
1202 
1203  //
1204  // If we got back an Fcb then we consumed the FinalName
1205  // legitimately, so the remaining name is now RemainingPart.
1206  //
1207 
1208  if (NextFcb != NULL) {
1209  Fcb = NextFcb;
1210  RemainingPart = NextRemainingPart;
1211  }
1212 
1213  if ((NextFcb == NULL) ||
1214  (NodeType(NextFcb) == FAT_NTC_FCB) ||
1215  (NextRemainingPart.Length == 0)) {
1216 
1217  break;
1218  }
1219  }
1220 
1221  //
1222  // Remaining name cannot start with a backslash
1223  //
1224 
1225  if (RemainingPart.Length && (RemainingPart.Buffer[0] == L'\\')) {
1226 
1227  RemainingPart.Length -= sizeof(WCHAR);
1228  RemainingPart.Buffer += 1;
1229  }
1230 
1231  //
1232  // Now verify that everybody up to the longest found prefix is valid.
1233  //
1234 
1235  _SEH2_TRY {
1236 
1237  FatVerifyFcb( IrpContext, Fcb );
1238 
1239  } _SEH2_EXCEPT( (_SEH2_GetExceptionCode() == STATUS_FILE_INVALID) ?
1240  EXCEPTION_EXECUTE_HANDLER :
1241  EXCEPTION_CONTINUE_SEARCH ) {
1242 
1243  FatResetExceptionState( IrpContext );
1244  } _SEH2_END;
1245 
1246  if ( Fcb->FcbCondition == FcbGood ) {
1247 
1248  //
1249  // If we are trying to open a paging file and have happened
1250  // upon the DelayedCloseFcb, make it go away, and try again.
1251  //
1252 
1253  if (IsPagingFile && FirstLoop &&
1254  (NodeType(Fcb) == FAT_NTC_FCB) &&
1255  (!IsListEmpty( &FatData.AsyncCloseList ) ||
1256  !IsListEmpty( &FatData.DelayedCloseList ))) {
1257 
1258  FatFspClose(Vcb);
1259 
1260  FirstLoop = FALSE;
1261 
1262  continue;
1263 
1264  } else {
1265 
1266  break;
1267  }
1268 
1269  } else {
1270 
1271  FatRemoveNames( IrpContext, Fcb );
1272  }
1273  }
1274 
1275  NT_ASSERT( Fcb->FcbCondition == FcbGood );
1276 
1277  //
1278  // If there is already an Fcb for a paging file open and
1279  // it was not already opened as a paging file, we cannot
1280  // continue as it is too difficult to move a live Fcb to
1281  // non-paged pool.
1282  //
1283 
1284  if (IsPagingFile) {
1285 
1286  if (NodeType(Fcb) == FAT_NTC_FCB &&
1287  !FlagOn( Fcb->FcbState, FCB_STATE_PAGING_FILE )) {
1288 
1289  try_return( Iosb.Status = STATUS_SHARING_VIOLATION );
1290  }
1291 
1292  //
1293  // Check for a system file.
1294  //
1295 
1296  } else if (FlagOn( Fcb->FcbState, FCB_STATE_SYSTEM_FILE )) {
1297 
1298  try_return( Iosb.Status = STATUS_ACCESS_DENIED );
1299  }
1300 
1301  //
1302  // If the longest prefix is pending delete (either the file or
1303  // some higher level directory), we cannot continue.
1304  //
1305 
1306  if (FlagOn( Fcb->FcbState, FCB_STATE_DELETE_ON_CLOSE )) {
1307 
1308  try_return( Iosb.Status = STATUS_DELETE_PENDING );
1309  }
1310 
1311  //
1312  // Now that we've found the longest matching prefix we'll
1313  // check if there isn't any remaining part because that means
1314  // we've located an existing fcb/dcb to open and we can do the open
1315  // without going to the disk
1316  //
1317 
1318  if (RemainingPart.Length == 0) {
1319 
1320  //
1321  // First check if the user wanted to open the target directory
1322  // and if so then call the subroutine to finish the open.
1323  //
1324 
1325  if (OpenTargetDirectory) {
1326 
1327  CollectCreateHitStatistics(Vcb);
1328 
1329  Iosb = FatOpenTargetDirectory( IrpContext,
1330  FileObject,
1331  Fcb->ParentDcb,
1332  DesiredAccess,
1333  ShareAccess,
1334  TRUE,
1335  FileNameOpenedDos );
1336  Irp->IoStatus.Information = Iosb.Information;
1337  try_return( Iosb.Status );
1338  }
1339 
1340  //
1341  // We can open an existing fcb/dcb, now we only need to case
1342  // on which type to open.
1343  //
1344 
1345  if (NodeType(Fcb) == FAT_NTC_DCB || NodeType(Fcb) == FAT_NTC_ROOT_DCB) {
1346 
1347  //
1348  // This is a directory we're opening up so check if
1349  // we were not to open a directory
1350  //
1351 
1352  if (NonDirectoryFile) {
1353 
1354  DebugTrace(0, Dbg, "Cannot open directory as a file\n", 0);
1355 
1356  try_return( Iosb.Status = STATUS_FILE_IS_A_DIRECTORY );
1357  }
1358 
1359  DebugTrace(0, Dbg, "Open existing dcb, Dcb = %p\n", Fcb);
1360 
1361  CollectCreateHitStatistics(Vcb);
1362 
1363  Iosb = FatOpenExistingDcb( IrpContext,
1364  IrpSp,
1365  FileObject,
1366  Vcb,
1367  (PDCB)Fcb,
1368  DesiredAccess,
1369  ShareAccess,
1370  CreateDisposition,
1371  NoEaKnowledge,
1372  DeleteOnClose,
1373  OpenRequiringOplock,
1374  FileNameOpenedDos,
1375  &OplockPostIrp );
1376 
1377  if (Iosb.Status != STATUS_PENDING) {
1378 
1379  Irp->IoStatus.Information = Iosb.Information;
1380 
1381  } else {
1382 
1383  DebugTrace(0, Dbg, "Enqueue Irp to FSP\n", 0);
1384 
1385  PostIrp = TRUE;
1386  }
1387 
1388  try_return( Iosb.Status );
1389  }
1390 
1391  //
1392  // Check if we're trying to open an existing Fcb and that
1393  // the user didn't want to open a directory. Note that this
1394  // call might actually come back with status_pending because
1395  // the user wanted to supersede or overwrite the file and we
1396  // cannot block. If it is pending then we do not complete the
1397  // request, and we fall through the bottom to the code that
1398  // dispatches the request to the fsp.
1399  //
1400 
1401  if (NodeType(Fcb) == FAT_NTC_FCB) {
1402 
1403  //
1404  // Check if we were only to open a directory
1405  //
1406 
1407  if (OpenDirectory) {
1408 
1409  DebugTrace(0, Dbg, "Cannot open file as directory\n", 0);
1410 
1411  try_return( Iosb.Status = STATUS_NOT_A_DIRECTORY );
1412  }
1413 
1414  DebugTrace(0, Dbg, "Open existing fcb, Fcb = %p\n", Fcb);
1415 
1416  if ( TrailingBackslash ) {
1417  try_return( Iosb.Status = STATUS_OBJECT_NAME_INVALID );
1418  }
1419 
1420  CollectCreateHitStatistics(Vcb);
1421 
1422  Iosb = FatOpenExistingFcb( IrpContext,
1423  IrpSp,
1424  FileObject,
1425  Vcb,
1426  Fcb,
1427  DesiredAccess,
1428  ShareAccess,
1429  AllocationSize,
1430  EaBuffer,
1431  EaLength,
1432  FileAttributes,
1433  CreateDisposition,
1434  NoEaKnowledge,
1435  DeleteOnClose,
1436  OpenRequiringOplock,
1437  FileNameOpenedDos,
1438  &OplockPostIrp );
1439 
1440  if (Iosb.Status != STATUS_PENDING) {
1441 
1442  //
1443  // Check if we need to set the cache support flag in
1444  // the file object
1445  //
1446 
1447  if (NT_SUCCESS( Iosb.Status) && !NoIntermediateBuffering) {
1448 
1449  FileObject->Flags |= FO_CACHE_SUPPORTED;
1450  }
1451 
1452  Irp->IoStatus.Information = Iosb.Information;
1453 
1454  } else {
1455 
1456  DebugTrace(0, Dbg, "Enqueue Irp to FSP\n", 0);
1457 
1458  PostIrp = TRUE;
1459  }
1460 
1461  try_return( Iosb.Status );
1462  }
1463 
1464  //
1465  // Not and Fcb or a Dcb so we bug check
1466  //
1467 
1468 #ifdef _MSC_VER
1469 #pragma prefast( suppress:28159, "this is a serious corruption if it happens" )
1470 #endif
1471  FatBugCheck( NodeType(Fcb), (ULONG_PTR) Fcb, 0 );
1472  }
1473 
1474  //
1475  // There is more in the name to parse than we have in existing
1476  // fcbs/dcbs. So now make sure that fcb we got for the largest
1477  // matching prefix is really a dcb otherwise we can't go any
1478  // further
1479  //
1480 
1481  if ((NodeType(Fcb) != FAT_NTC_DCB) && (NodeType(Fcb) != FAT_NTC_ROOT_DCB)) {
1482 
1483  DebugTrace(0, Dbg, "Cannot open file as subdirectory, Fcb = %p\n", Fcb);
1484 
1485  try_return( Iosb.Status = STATUS_OBJECT_PATH_NOT_FOUND );
1486  }
1487 
1488  //
1489  // Otherwise we continue on processing the Irp and allowing ourselves
1490  // to block for I/O as necessary. Find/create additional dcb's for
1491  // the one we're trying to open. We loop until either remaining part
1492  // is empty or we get a bad filename. When we exit FinalName is
1493  // the last name in the string we're after, and ParentDcb is the
1494  // parent directory that will contain the opened/created
1495  // file/directory.
1496  //
1497  // Make sure the rest of the name is valid in at least the LFN
1498  // character set (which just happens to be that of HPFS).
1499  //
1500  // If we are not in ChicagoMode, use FAT semantics.
1501  //
1502 
1503  ParentDcb = Fcb;
1504  FirstLoop = TRUE;
1505 
1506  while (TRUE) {
1507 
1508  //
1509  // We do one little optimization here on the first iteration of
1510  // the loop since we know that we have already tried to convert
1511  // FinalOemName from the original UNICODE.
1512  //
1513 
1514  if (FirstLoop) {
1515 
1516  FirstLoop = FALSE;
1517  RemainingPart = NextRemainingPart;
1518  Status = OemFinalName.Length ? STATUS_SUCCESS : STATUS_UNMAPPABLE_CHARACTER;
1519 
1520  } else {
1521 
1522  //
1523  // Dissect the remaining part.
1524  //
1525 
1526  DebugTrace(0, Dbg, "Dissecting the name %wZ\n", &RemainingPart);
1527 
1528  FsRtlDissectName( RemainingPart,
1529  &FinalName,
1530  &RemainingPart );
1531 
1532  //
1533  // If RemainingPart starts with a backslash the name is
1534  // invalid.
1535  // Check for no more than 255 characters in FinalName
1536  //
1537 
1538  if (((RemainingPart.Length != 0) && (RemainingPart.Buffer[0] == L'\\')) ||
1539  (FinalName.Length > 255*sizeof(WCHAR))) {
1540 
1541  try_return( Iosb.Status = STATUS_OBJECT_NAME_INVALID );
1542  }
1543 
1544  //
1545  // Now, try to convert this one component into Oem. If it works
1546  // then that's great, otherwise we have to try with the UNICODE
1547  // name instead.
1548  //
1549 
1550  FatEnsureStringBufferEnough( &OemFinalName,
1551  FinalName.Length);
1552 
1553  Status = RtlUpcaseUnicodeStringToCountedOemString( &OemFinalName, &FinalName, FALSE );
1554  }
1555 
1556  if (NT_SUCCESS(Status)) {
1557 
1558  //
1559  // We'll start by trying to locate the dirent for the name. Note
1560  // that we already know that there isn't an Fcb/Dcb for the file
1561  // otherwise we would have found it when we did our prefix lookup.
1562  //
1563 
1564  if (FatIsNameShortOemValid( IrpContext, OemFinalName, FALSE, FALSE, FALSE )) {
1565 
1566  FatStringTo8dot3( IrpContext,
1567  OemFinalName,
1568  &LocalCcb.OemQueryTemplate.Constant );
1569 
1570  LocalCcb.Flags = 0;
1571 
1572  } else {
1573 
1574  LocalCcb.Flags = CCB_FLAG_SKIP_SHORT_NAME_COMPARE;
1575  }
1576 
1577  } else {
1578 
1579  LocalCcb.Flags = CCB_FLAG_SKIP_SHORT_NAME_COMPARE;
1580 
1581  if (Status != STATUS_UNMAPPABLE_CHARACTER) {
1582 
1583  try_return( Iosb.Status = Status );
1584  }
1585  }
1586 
1587  //
1588  // Now we know a lot about the final name, so do legal name
1589  // checking here.
1590  //
1591 
1592  if (FatData.ChicagoMode) {
1593 
1594  if (!FatIsNameLongUnicodeValid( IrpContext, &FinalName, FALSE, FALSE, FALSE )) {
1595 
1596  try_return( Iosb.Status = STATUS_OBJECT_NAME_INVALID );
1597  }
1598 
1599  } else {
1600 
1601  if (FlagOn(LocalCcb.Flags, CCB_FLAG_SKIP_SHORT_NAME_COMPARE)) {
1602 
1603  try_return( Iosb.Status = STATUS_OBJECT_NAME_INVALID );
1604  }
1605  }
1606 
1607  DebugTrace(0, Dbg, "FinalName is %wZ\n", &FinalName);
1608  DebugTrace(0, Dbg, "RemainingPart is %wZ\n", &RemainingPart);
1609 
1610  FatEnsureStringBufferEnough( &UpcasedFinalName,
1611  FinalName.Length);
1612 
1613  if (!NT_SUCCESS(Status = RtlUpcaseUnicodeString( &UpcasedFinalName, &FinalName, FALSE))) {
1614 
1615  try_return( Iosb.Status = Status );
1616  }
1617 
1618  LocalCcb.UnicodeQueryTemplate = UpcasedFinalName;
1619  LocalCcb.ContainsWildCards = FALSE;
1620 
1621  Lfn.Length = 0;
1622 
1623 
1624  FatLocateDirent( IrpContext,
1625  ParentDcb,
1626  &LocalCcb,
1627  0,
1628  &MatchFlags,
1629  &Dirent,
1630  &DirentBcb,
1631  (PVBO)&DirentByteOffset,
1632  &FileNameOpenedDos,
1633  &Lfn,
1634  &OrigLfn);
1635 
1636  //
1637  // Remember we read this Dcb for error recovery.
1638  //
1639 
1640  FinalDcb = ParentDcb;
1641 
1642  //
1643  // If the remaining part is now empty then this is the last name
1644  // in the string and the one we want to open
1645  //
1646 
1647  if (RemainingPart.Length == 0) {
1648 
1649 
1650  break;
1651  }
1652 
1653  //
1654  // We didn't find a dirent, bail.
1655  //
1656 
1657  if (Dirent == NULL) {
1658 
1659  Iosb.Status = STATUS_OBJECT_PATH_NOT_FOUND;
1660  try_return( Iosb.Status );
1661  }
1662 
1663  //
1664  // We now have a dirent, make sure it is a directory
1665  //
1666 
1667  if (!FlagOn( Dirent->Attributes, FAT_DIRENT_ATTR_DIRECTORY )) {
1668 
1669  Iosb.Status = STATUS_OBJECT_PATH_NOT_FOUND;
1670  try_return( Iosb.Status );
1671  }
1672 
1673  //
1674  // Compute the LfnByteOffset.
1675  //
1676 
1677  LfnByteOffset = DirentByteOffset -
1678  FAT_LFN_DIRENTS_NEEDED(&OrigLfn) * sizeof(LFN_DIRENT);
1679 
1680  //
1681  // Create a dcb for the new directory
1682  //
1683 
1684  ParentDcb = FatCreateDcb( IrpContext,
1685  Vcb,
1686  ParentDcb,
1687  LfnByteOffset,
1688  DirentByteOffset,
1689  Dirent,
1690  &Lfn );
1691 
1692  //
1693  // Remember we created this Dcb for error recovery.
1694  //
1695 
1696  FinalDcb = ParentDcb;
1697 
1698  FatSetFullNameInFcb( IrpContext, ParentDcb, &FinalName );
1699  }
1700 
1701  //
1702  // First check if the user wanted to open the target directory
1703  // and if so then call the subroutine to finish the open.
1704  //
1705 
1706  if (OpenTargetDirectory) {
1707 
1708  Iosb = FatOpenTargetDirectory( IrpContext,
1709  FileObject,
1710  ParentDcb,
1711  DesiredAccess,
1712  ShareAccess,
1713  Dirent ? TRUE : FALSE,
1714  FileNameOpenedDos);
1715 
1716  Irp->IoStatus.Information = Iosb.Information;
1717  try_return( Iosb.Status );
1718  }
1719 
1720  if (Dirent != NULL) {
1721 
1722  //
1723  // Compute the LfnByteOffset.
1724  //
1725 
1726  LfnByteOffset = DirentByteOffset -
1727  FAT_LFN_DIRENTS_NEEDED(&OrigLfn) * sizeof(LFN_DIRENT);
1728 
1729  //
1730  // We were able to locate an existing dirent entry, so now
1731  // see if it is a directory that we're trying to open.
1732  //
1733 
1734  if (FlagOn( Dirent->Attributes, FAT_DIRENT_ATTR_DIRECTORY )) {
1735 
1736  //
1737  // Make sure its okay to open a directory
1738  //
1739 
1740  if (NonDirectoryFile) {
1741 
1742  DebugTrace(0, Dbg, "Cannot open directory as a file\n", 0);
1743 
1744  try_return( Iosb.Status = STATUS_FILE_IS_A_DIRECTORY );
1745  }
1746 
1747  DebugTrace(0, Dbg, "Open existing directory\n", 0);
1748 
1749  Iosb = FatOpenExistingDirectory( IrpContext,
1750  IrpSp,
1751  FileObject,
1752  Vcb,
1753  &Fcb,
1754  ParentDcb,
1755  Dirent,
1756  LfnByteOffset,
1757  DirentByteOffset,
1758  &Lfn,
1759  DesiredAccess,
1760  ShareAccess,
1761  CreateDisposition,
1762  NoEaKnowledge,
1763  DeleteOnClose,
1764  FileNameOpenedDos,
1765  OpenRequiringOplock );
1766 
1767  Irp->IoStatus.Information = Iosb.Information;
1768  try_return( Iosb.Status );
1769  }
1770 
1771  //
1772  // Otherwise we're trying to open and existing file, and we
1773  // need to check if the user only wanted to open a directory.
1774  //
1775 
1776  if (OpenDirectory) {
1777 
1778  DebugTrace(0, Dbg, "Cannot open file as directory\n", 0);
1779 
1780  try_return( Iosb.Status = STATUS_NOT_A_DIRECTORY );
1781  }
1782 
1783  DebugTrace(0, Dbg, "Open existing file\n", 0);
1784 
1785  if ( TrailingBackslash ) {
1786  try_return( Iosb.Status = STATUS_OBJECT_NAME_INVALID );
1787  }
1788 
1789 
1790  Iosb = FatOpenExistingFile( IrpContext,
1791  FileObject,
1792  Vcb,
1793  &Fcb,
1794  ParentDcb,
1795  Dirent,
1796  LfnByteOffset,
1797  DirentByteOffset,
1798  &Lfn,
1799  &OrigLfn,
1800  DesiredAccess,
1801  ShareAccess,
1802  AllocationSize,
1803  EaBuffer,
1804  EaLength,
1805  FileAttributes,
1806  CreateDisposition,
1807  IsPagingFile,
1808  NoEaKnowledge,
1809  DeleteOnClose,
1810  OpenRequiringOplock,
1811  FileNameOpenedDos );
1812 
1813  //
1814  // Check if we need to set the cache support flag in
1815  // the file object
1816  //
1817 
1818  if (NT_SUCCESS(Iosb.Status) && !NoIntermediateBuffering) {
1819 
1820  FileObject->Flags |= FO_CACHE_SUPPORTED;
1821  }
1822 
1823  Irp->IoStatus.Information = Iosb.Information;
1824  try_return( Iosb.Status );
1825  }
1826 
1827  //
1828  // We can't locate a dirent so this is a new file.
1829  //
1830 
1831  //
1832  // Now check to see if we wanted to only open an existing file.
1833  // And then case on whether we wanted to create a file or a directory.
1834  //
1835 
1836  if ((CreateDisposition == FILE_OPEN) ||
1837  (CreateDisposition == FILE_OVERWRITE)) {
1838 
1839  DebugTrace( 0, Dbg, "Cannot open nonexisting file\n", 0);
1840 
1841  try_return( Iosb.Status = STATUS_OBJECT_NAME_NOT_FOUND );
1842  }
1843 
1844  //
1845  // Skip a few cycles later if we know now that the Oem name is not
1846  // valid 8.3.
1847  //
1848 
1849  if (FlagOn(LocalCcb.Flags, CCB_FLAG_SKIP_SHORT_NAME_COMPARE)) {
1850 
1851  OemFinalName.Length = 0;
1852  }
1853 
1854  //
1855  // Determine the granted access for this operation now.
1856  //
1857 
1858  if (!NT_SUCCESS( Iosb.Status = FatCheckSystemSecurityAccess( IrpContext ))) {
1859 
1860  try_return( Iosb );
1861  }
1862 
1863  if (CreateDirectory) {
1864 
1865  DebugTrace(0, Dbg, "Create new directory\n", 0);
1866 
1867  //
1868  // If this media is write protected, don't even try the create.
1869  //
1870 
1871  if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_WRITE_PROTECTED)) {
1872 
1873  //
1874  // Set the real device for the pop-up info, and set the verify
1875  // bit in the device object, so that we will force a verify
1876  // in case the user put the correct media back in.
1877  //
1878 
1879 
1880  IoSetHardErrorOrVerifyDevice( IrpContext->OriginatingIrp,
1881  Vcb->Vpb->RealDevice );
1882 
1883  SetFlag(Vcb->Vpb->RealDevice->Flags, DO_VERIFY_VOLUME);
1884 
1885  FatRaiseStatus( IrpContext, STATUS_MEDIA_WRITE_PROTECTED );
1886  }
1887 
1888  //
1889  // Don't allow people to create directories with the
1890  // temporary bit set.
1891  //
1892 
1893  if (TemporaryFile) {
1894 
1895  try_return( Iosb.Status = STATUS_INVALID_PARAMETER );
1896  }
1897 
1898  Iosb = FatCreateNewDirectory( IrpContext,
1899  IrpSp,
1900  FileObject,
1901  Vcb,
1902  ParentDcb,
1903  &OemFinalName,
1904  &FinalName,
1905  DesiredAccess,
1906  ShareAccess,
1907  EaBuffer,
1908  EaLength,
1909  FileAttributes,
1910  NoEaKnowledge,
1911  DeleteOnClose,
1912  OpenRequiringOplock );
1913 
1914  Irp->IoStatus.Information = Iosb.Information;
1915  try_return( Iosb.Status );
1916  }
1917 
1918  DebugTrace(0, Dbg, "Create new file\n", 0);
1919 
1920  if ( TrailingBackslash ) {
1921 
1922  try_return( Iosb.Status = STATUS_OBJECT_NAME_INVALID );
1923  }
1924 
1925  //
1926  // If this media is write protected, don't even try the create.
1927  //
1928 
1929  if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_WRITE_PROTECTED)) {
1930 
1931  //
1932  // Set the real device for the pop-up info, and set the verify
1933  // bit in the device object, so that we will force a verify
1934  // in case the user put the correct media back in.
1935  //
1936 
1937 
1938  IoSetHardErrorOrVerifyDevice( IrpContext->OriginatingIrp,
1939  Vcb->Vpb->RealDevice );
1940 
1941  SetFlag(Vcb->Vpb->RealDevice->Flags, DO_VERIFY_VOLUME);
1942 
1943  FatRaiseStatus( IrpContext, STATUS_MEDIA_WRITE_PROTECTED );
1944  }
1945 
1946 
1947  Iosb = FatCreateNewFile( IrpContext,
1948  IrpSp,
1949  FileObject,
1950  Vcb,
1951  ParentDcb,
1952  &OemFinalName,
1953  &FinalName,
1954  DesiredAccess,
1955  ShareAccess,
1956  AllocationSize,
1957  EaBuffer,
1958  EaLength,
1959  FileAttributes,
1960  &Lfn,
1961  IsPagingFile,
1962  NoEaKnowledge,
1963  DeleteOnClose,
1964  OpenRequiringOplock,
1965  TemporaryFile );
1966 
1967  //
1968  // Check if we need to set the cache support flag in
1969  // the file object
1970  //
1971 
1972  if (NT_SUCCESS(Iosb.Status) && !NoIntermediateBuffering) {
1973 
1974  FileObject->Flags |= FO_CACHE_SUPPORTED;
1975  }
1976 
1977  Irp->IoStatus.Information = Iosb.Information;
1978 
1979  try_exit: NOTHING;
1980 
1981  //
1982  // This is a Beta Fix. Do this at a better place later.
1983  //
1984 
1985  if (NT_SUCCESS(Iosb.Status) && !OpenTargetDirectory) {
1986 
1987  PFCB LocalFcb;
1988 
1989  //
1990  // If there is an Fcb/Dcb, set the long file name.
1991  //
1992 
1993  LocalFcb = FileObject->FsContext;
1994 
1995  if (LocalFcb &&
1996  ((NodeType(LocalFcb) == FAT_NTC_FCB) ||
1997  (NodeType(LocalFcb) == FAT_NTC_DCB)) &&
1998  (LocalFcb->FullFileName.Buffer == NULL)) {
1999 
2000  FatSetFullNameInFcb( IrpContext, LocalFcb, &FinalName );
2001  }
2002  }
2003 
2004  } _SEH2_FINALLY {
2005 
2006  DebugUnwind( FatCommonCreate );
2007 
2008 #if (NTDDI_VERSION >= NTDDI_WIN7)
2009 
2010  //
2011  // If we're not getting out with success, and if the caller wanted
2012  // atomic create-with-oplock semantics make sure we back out any
2013  // oplock that may have been granted.
2014  //
2015 
2016  if ((AbnormalTermination() ||
2017  !NT_SUCCESS( Iosb.Status )) &&
2018  OpenRequiringOplock &&
2019  (Iosb.Status != STATUS_CANNOT_BREAK_OPLOCK) &&
2020  (IrpContext->ExceptionStatus != STATUS_CANNOT_BREAK_OPLOCK) &&
2021  (Fcb != NULL) &&
2022  FatIsFileOplockable( Fcb )) {
2023 
2024  FsRtlCheckOplockEx( FatGetFcbOplock(Fcb),
2025  IrpContext->OriginatingIrp,
2026  OPLOCK_FLAG_BACK_OUT_ATOMIC_OPLOCK,
2027  NULL,
2028  NULL,
2029  NULL );
2030  }
2031 #endif
2032 
2033  //
2034  // There used to be a test here - the ASSERT replaces it. We will
2035  // never have begun enumerating directories if we post the IRP for
2036  // oplock reasons.
2037  //
2038 
2039  NT_ASSERT( !OplockPostIrp || DirentBcb == NULL );
2040 
2041  FatUnpinBcb( IrpContext, DirentBcb );
2042 
2043  //
2044  // If we are in an error path, check for any created subdir Dcbs that
2045  // have to be unwound. Don't whack the root directory.
2046  //
2047  // Note this will leave a branch of Dcbs dangling if the directory file
2048  // had not been built on the leaf (case: opening path which has an
2049  // element containing an invalid character name).
2050  //
2051 
2052  if (_SEH2_AbnormalTermination() || !NT_SUCCESS(Iosb.Status)) {
2053 
2054  ULONG SavedFlags;
2055 
2056  //
2057  // Before doing the uninitialize, we have to unpin anything
2058  // that has been repinned, but disable writethrough first. We
2059  // disable raise from unpin-repin since we're already failing.
2060  //
2061 
2062  SavedFlags = IrpContext->Flags;
2063 
2064  SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_DISABLE_RAISE |
2065  IRP_CONTEXT_FLAG_DISABLE_WRITE_THROUGH );
2066 
2067  FatUnpinRepinnedBcbs( IrpContext );
2068 
2069  if ((FinalDcb != NULL) &&
2070  (NodeType(FinalDcb) == FAT_NTC_DCB) &&
2071  IsListEmpty(&FinalDcb->Specific.Dcb.ParentDcbQueue) &&
2072  (FinalDcb->OpenCount == 0) &&
2073  (FinalDcb->Specific.Dcb.DirectoryFile != NULL)) {
2074 
2075  PFILE_OBJECT DirectoryFileObject;
2076 
2077  DirectoryFileObject = FinalDcb->Specific.Dcb.DirectoryFile;
2078 
2079  FinalDcb->Specific.Dcb.DirectoryFile = NULL;
2080 
2081  CcUninitializeCacheMap( DirectoryFileObject, NULL, NULL );
2082 
2083  ObDereferenceObject( DirectoryFileObject );
2084  }
2085 
2086  IrpContext->Flags = SavedFlags;
2087  }
2088 
2089  if (_SEH2_AbnormalTermination()) {
2090 
2091  FatReleaseVcb( IrpContext, Vcb );
2092  }
2093 
2094  //
2095  // Free up any string buffers we allocated
2096  //
2097 
2098  FatFreeStringBuffer( &OemFinalName);
2099 
2100  FatFreeStringBuffer( &UpcasedFinalName);
2101 
2102  FatFreeStringBuffer( &Lfn);
2103  } _SEH2_END;
2104 
2105  //
2106  // The following code is only executed if we are exiting the
2107  // procedure through a normal termination. We complete the request
2108  // and if for any reason that bombs out then we need to unreference
2109  // and possibly delete the fcb and ccb.
2110  //
2111 
2112  _SEH2_TRY {
2113 
2114  if (PostIrp) {
2115 
2116  //
2117  // If the Irp hasn't already been posted, do it now.
2118  //
2119 
2120  if (!OplockPostIrp) {
2121 
2122  Iosb.Status = FatFsdPostRequest( IrpContext, Irp );
2123  }
2124 
2125  } else {
2126 
2127  FatUnpinRepinnedBcbs( IrpContext );
2128  }
2129 
2130  } _SEH2_FINALLY {
2131 
2132  DebugUnwind( FatCommonCreate-in-FatCompleteRequest );
2133 
2134  if (_SEH2_AbnormalTermination() ) {
2135 
2136  PVCB LocalVcb;
2137  PFCB LocalFcb;
2138  PCCB LocalCcb2;
2139  PFILE_OBJECT DirectoryFileObject;
2140 
2141  //
2142  // Unwind all of our counts. Note that if a write failed, then
2143  // the volume has been marked for verify, and all volume
2144  // structures will be cleaned up automatically.
2145  //
2146 
2147  (VOID) FatDecodeFileObject( FileObject, &LocalVcb, &LocalFcb, &LocalCcb2 );
2148 
2149  LocalFcb->UncleanCount -= 1;
2150  LocalFcb->OpenCount -= 1;
2151  LocalVcb->OpenFileCount -= 1;
2152 
2153  if (IsFileObjectReadOnly(FileObject)) { LocalVcb->ReadOnlyCount -= 1; }
2154 
2155 
2156  //
2157  // WinSE #307418 "Occasional data corruption when standby/resume
2158  // while copying files to removable FAT formatted media".
2159  // If new file creation request was interrupted by system suspend
2160  // operation we should revert the changes we made to the parent
2161  // directory and to the allocation table.
2162  //
2163 
2164  if (IrpContext->ExceptionStatus == STATUS_VERIFY_REQUIRED &&
2165  NodeType( LocalFcb ) == FAT_NTC_FCB) {
2166 
2167  FatTruncateFileAllocation( IrpContext, LocalFcb, 0 );
2168 
2169  FatDeleteDirent( IrpContext, LocalFcb, NULL, TRUE );
2170  }
2171 
2172  //
2173  // If we leafed out on a new Fcb we should get rid of it at this point.
2174  //
2175  // Since the object isn't being opened, we have to do all of the teardown
2176  // here. Our close path will not occur for this fileobject. Note this
2177  // will leave a branch of Dcbs dangling since we do it by hand and don't
2178  // chase to the root.
2179  //
2180 
2181  if (LocalFcb->OpenCount == 0 &&
2182  (NodeType( LocalFcb ) == FAT_NTC_FCB ||
2183  IsListEmpty(&LocalFcb->Specific.Dcb.ParentDcbQueue))) {
2184 
2185  NT_ASSERT( NodeType( LocalFcb ) != FAT_NTC_ROOT_DCB );
2186 
2187  if ( (NodeType( LocalFcb ) == FAT_NTC_DCB) &&
2188  (LocalFcb->Specific.Dcb.DirectoryFile != NULL) ) {
2189 
2190  DirectoryFileObject = LocalFcb->Specific.Dcb.DirectoryFile;
2191  LocalFcb->Specific.Dcb.DirectoryFile = NULL;
2192 
2193  CcUninitializeCacheMap( DirectoryFileObject,
2194  &FatLargeZero,
2195  NULL );
2196 
2197  ObDereferenceObject( DirectoryFileObject );
2198 
2199  } else {
2200  if (ARGUMENT_PRESENT( FileObject )) {
2201  FileObject->SectionObjectPointer = NULL;
2202  }
2203  FatDeleteFcb( IrpContext, &LocalFcb );
2204  }
2205  }
2206 
2207  FatDeleteCcb( IrpContext, &LocalCcb2 );
2208 
2209  FatReleaseVcb( IrpContext, LocalVcb );
2210 
2211  } else {
2212 
2213  FatReleaseVcb( IrpContext, Vcb );
2214 
2215  if ( !PostIrp ) {
2216 
2217  //
2218  // If this request is successful and the file was opened
2219  // for FILE_EXECUTE access, then set the FileObject bit.
2220  //
2221 
2222  NT_ASSERT( IrpSp->Parameters.Create.SecurityContext != NULL );
2223  if (FlagOn( *DesiredAccess, FILE_EXECUTE )) {
2224 
2225  SetFlag( FileObject->Flags, FO_FILE_FAST_IO_READ );
2226  }
2227 
2228  //
2229  // Lock volume in drive if we opened a paging file, allocating a
2230  // reserve MDL to guarantee paging file operations can always
2231  // go forward.
2232  //
2233 
2234  if (IsPagingFile && NT_SUCCESS(Iosb.Status)) {
2235 
2236 #ifdef _MSC_VER
2237 #pragma prefast( suppress:28112, "this should be safe" )
2238 #endif
2239  if (!FatReserveMdl) {
2240 
2241  PMDL ReserveMdl = IoAllocateMdl( NULL,
2242  FAT_RESERVE_MDL_SIZE * PAGE_SIZE,
2243  TRUE,
2244  FALSE,
2245  NULL );
2246 
2247  //
2248  // Stash the MDL, and if it turned out there was already one there
2249  // just free what we got.
2250  //
2251 
2252 #ifndef __REACTOS__
2253  InterlockedCompareExchangePointer( &FatReserveMdl, ReserveMdl, NULL );
2254 #else
2255  InterlockedCompareExchangePointer( (void * volatile*)&FatReserveMdl, ReserveMdl, NULL );
2256 #endif
2257 
2258 #ifdef _MSC_VER
2259 #pragma prefast( suppress:28112, "this should be safe" )
2260 #endif
2261  if (FatReserveMdl != ReserveMdl) {
2262 
2263  IoFreeMdl( ReserveMdl );
2264  }
2265  }
2266 
2267  SetFlag(Vcb->VcbState, VCB_STATE_FLAG_BOOT_OR_PAGING_FILE);
2268 
2269  if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_REMOVABLE_MEDIA)) {
2270 
2271  FatToggleMediaEjectDisable( IrpContext, Vcb, TRUE );
2272  }
2273  }
2274 
2275  }
2276  }
2277 
2278  DebugTrace(-1, Dbg, "FatCommonCreate -> %08lx\n", Iosb.Status);
2279  } _SEH2_END;
2280 
2281  CollectCreateStatistics(Vcb, Iosb.Status);
2282 
2283  return Iosb.Status;
2284 }
2285 
2286 //
2287 // Internal support routine
2288 //
2289 
2290 _Requires_lock_held_(_Global_critical_region_)
2291 IO_STATUS_BLOCK
2292 FatOpenVolume (
2293  _In_ PIRP_CONTEXT IrpContext,
2294  _Inout_ PFILE_OBJECT FileObject,
2295  _Inout_ PVCB Vcb,
2296  _In_ PACCESS_MASK DesiredAccess,
2297  _In_ USHORT ShareAccess,
2298  _In_ ULONG CreateDisposition
2299  )
2300 
2301 /*++
2302 
2303 Routine Description:
2304 
2305  This routine opens the specified volume for DASD access
2306 
2307 Arguments:
2308 
2309  FileObject - Supplies the File object
2310 
2311  Vcb - Supplies the Vcb denoting the volume being opened
2312 
2313  DesiredAccess - Supplies the desired access of the caller
2314 
2315  ShareAccess - Supplies the share access of the caller
2316 
2317  CreateDisposition - Supplies the create disposition for this operation
2318 
2319 Return Value:
2320 
2321  IO_STATUS_BLOCK - Returns the completion status for the operation
2322 
2323 --*/
2324 
2325 {
2326  NTSTATUS Status;
2327  PIO_STACK_LOCATION IrpSp;
2328 
2329 #ifndef __REACTOS__
2330  IO_STATUS_BLOCK Iosb = {0,0};
2331 #else
2332  IO_STATUS_BLOCK Iosb = {{0}};
2333 #endif
2334 
2335  BOOLEAN CleanedVolume = FALSE;
2336 
2337  //
2338  // The following variables are for abnormal termination
2339  //
2340 
2341  BOOLEAN UnwindShareAccess = FALSE;
2342  PCCB UnwindCcb = NULL;
2343  BOOLEAN UnwindCounts = FALSE;
2344  BOOLEAN UnwindVolumeLock = FALSE;
2345 
2346  PAGED_CODE();
2347 
2348  DebugTrace(+1, Dbg, "FatOpenVolume...\n", 0);
2349 
2350  _SEH2_TRY {
2351 
2352  //
2353  // Check for proper desired access and rights
2354  //
2355 
2356  if ((CreateDisposition != FILE_OPEN) &&
2357  (CreateDisposition != FILE_OPEN_IF)) {
2358 
2359  try_return( Iosb.Status = STATUS_ACCESS_DENIED );
2360  }
2361 
2362  //
2363  // If the user does not want to share write or delete then we will try
2364  // and take out a lock on the volume.
2365  //
2366 
2367  if (!FlagOn(ShareAccess, FILE_SHARE_WRITE) &&
2368  !FlagOn(ShareAccess, FILE_SHARE_DELETE)) {
2369 
2370 #if (NTDDI_VERSION >= NTDDI_VISTA)
2371  //
2372  // See if the user has requested write access. If so, they cannot share
2373  // read. There is one exception to this. We allow autochk to get an
2374  // implicit lock on the volume while still allowing readers. Once the
2375  // the system is booted, though, we do not allow this type of access.
2376  //
2377 
2378  if (FlagOn( *DesiredAccess, (FILE_WRITE_DATA | FILE_APPEND_DATA) ) &&
2379  FsRtlAreVolumeStartupApplicationsComplete()) {
2380 
2381  ClearFlag( ShareAccess, FILE_SHARE_READ );
2382  }
2383 #endif
2384 
2385  //
2386  // Do a quick check here for handles on exclusive open.
2387  //
2388 
2389  if (!FlagOn(ShareAccess, FILE_SHARE_READ) &&
2390  !FatIsHandleCountZero( IrpContext, Vcb )) {
2391 
2392  try_return( Iosb.Status = STATUS_SHARING_VIOLATION );
2393  }
2394 
2395  //
2396  // Force Mm to get rid of its referenced file objects.
2397  //
2398 
2399  FatFlushFat( IrpContext, Vcb );
2400 
2401  FatPurgeReferencedFileObjects( IrpContext, Vcb->RootDcb, Flush );
2402 
2403  //
2404  // If the user also does not want to share read then we check
2405  // if anyone is already using the volume, and if so then we
2406  // deny the access. If the user wants to share read then
2407  // we allow the current opens to stay provided they are only
2408  // readonly opens and deny further opens.
2409  //
2410 
2411  if (!FlagOn(ShareAccess, FILE_SHARE_READ)) {
2412 
2413  if (Vcb->OpenFileCount != 0) {
2414 
2415  try_return( Iosb.Status = STATUS_SHARING_VIOLATION );
2416  }
2417 
2418  } else {
2419 
2420  if (Vcb->ReadOnlyCount != Vcb->OpenFileCount) {
2421 
2422  try_return( Iosb.Status = STATUS_SHARING_VIOLATION );
2423  }
2424  }
2425 
2426  //
2427  // Lock the volume
2428  //
2429 
2430  Vcb->VcbState |= VCB_STATE_FLAG_LOCKED;
2431  Vcb->FileObjectWithVcbLocked = FileObject;
2432  UnwindVolumeLock = TRUE;
2433 
2434  //
2435  // Clean the volume
2436  //
2437 
2438  CleanedVolume = TRUE;
2439 
2440  } else if (FlagOn( *DesiredAccess, FILE_READ_DATA | FILE_WRITE_DATA | FILE_APPEND_DATA )) {
2441 
2442  //
2443  // Flush the volume and let ourselves push the clean bit out if everything
2444  // worked.
2445  //
2446 
2447  if (NT_SUCCESS( FatFlushVolume( IrpContext, Vcb, Flush ))) {
2448 
2449  CleanedVolume = TRUE;
2450  }
2451  }
2452 
2453  //
2454  // Clean the volume if we believe it safe and reasonable.
2455  //
2456 
2457  if (CleanedVolume &&
2458  FlagOn( Vcb->VcbState, VCB_STATE_FLAG_VOLUME_DIRTY ) &&
2459  !FlagOn( Vcb->VcbState, VCB_STATE_FLAG_MOUNTED_DIRTY ) &&
2460  !CcIsThereDirtyData(Vcb->Vpb)) {
2461 
2462  //
2463  // Cancel any pending clean volumes.
2464  //
2465 
2466  (VOID)KeCancelTimer( &Vcb->CleanVolumeTimer );
2467  (VOID)KeRemoveQueueDpc( &Vcb->CleanVolumeDpc );
2468 
2469  FatMarkVolume( IrpContext, Vcb, VolumeClean );
2470  ClearFlag( Vcb->VcbState, VCB_STATE_FLAG_VOLUME_DIRTY );
2471 
2472  //
2473  // Unlock the volume if it is removable.
2474  //
2475 
2476  if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_REMOVABLE_MEDIA) &&
2477  !FlagOn(Vcb->VcbState, VCB_STATE_FLAG_BOOT_OR_PAGING_FILE)) {
2478 
2479  FatToggleMediaEjectDisable( IrpContext, Vcb, FALSE );
2480  }
2481  }
2482 
2483  //
2484  // If the volume is already opened by someone then we need to check
2485  // the share access
2486  //
2487 
2488  if (Vcb->DirectAccessOpenCount > 0) {
2489 
2490  if (!NT_SUCCESS(Iosb.Status = IoCheckShareAccess( *DesiredAccess,
2491  ShareAccess,
2492  FileObject,
2493  &Vcb->ShareAccess,
2494  TRUE ))) {
2495 
2496  try_return( Iosb.Status );
2497  }
2498 
2499  } else {
2500 
2501  IoSetShareAccess( *DesiredAccess,
2502  ShareAccess,
2503  FileObject,
2504  &Vcb->ShareAccess );
2505  }
2506 
2507  UnwindShareAccess = TRUE;
2508 
2509  //
2510  // Set up the context and section object pointers, and update
2511  // our reference counts
2512  //
2513 
2514  FatSetFileObject( FileObject,
2515  UserVolumeOpen,
2516  Vcb,
2517  UnwindCcb = FatCreateCcb( IrpContext ));
2518 
2519  FileObject->SectionObjectPointer = &Vcb->SectionObjectPointers;
2520 
2521  Vcb->DirectAccessOpenCount += 1;
2522  Vcb->OpenFileCount += 1;
2523  if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount += 1; }
2524  UnwindCounts = TRUE;
2525  FileObject->Flags |= FO_NO_INTERMEDIATE_BUFFERING;
2526 
2527  //
2528  // At this point the open will succeed, so check if the user is getting explicit access
2529  // to the device. If not, we will note this so we can deny modifying FSCTL to it.
2530  //
2531 
2532  IrpSp = IoGetCurrentIrpStackLocation( IrpContext->OriginatingIrp );
2533  Status = FatExplicitDeviceAccessGranted( IrpContext,
2534  Vcb->Vpb->RealDevice,
2535  IrpSp->Parameters.Create.SecurityContext->AccessState,
2536  (KPROCESSOR_MODE)( FlagOn( IrpSp->Flags, SL_FORCE_ACCESS_CHECK ) ?
2537  UserMode :
2538  IrpContext->OriginatingIrp->RequestorMode ));
2539 
2540  if (NT_SUCCESS( Status )) {
2541 
2542  SetFlag( UnwindCcb->Flags, CCB_FLAG_MANAGE_VOLUME_ACCESS );
2543  }
2544 
2545  //
2546  // And set our status to success
2547  //
2548 
2549  Iosb.Status = STATUS_SUCCESS;
2550  Iosb.Information = FILE_OPENED;
2551 
2552  try_exit: NOTHING;
2553  } _SEH2_FINALLY {
2554 
2555  DebugUnwind( FatOpenVolume );
2556 
2557  //
2558  // If this is an abnormal termination then undo our work
2559  //
2560 
2561  if (_SEH2_AbnormalTermination() || !NT_SUCCESS(Iosb.Status)) {
2562 
2563  if (UnwindCounts) {
2564  Vcb->DirectAccessOpenCount -= 1;
2565  Vcb->OpenFileCount -= 1;
2566  if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount -= 1; }
2567  }
2568  if (UnwindCcb != NULL) { FatDeleteCcb( IrpContext, &UnwindCcb ); }
2569  if (UnwindShareAccess) { IoRemoveShareAccess( FileObject, &Vcb->ShareAccess ); }
2570  if (UnwindVolumeLock) { Vcb->VcbState &= ~VCB_STATE_FLAG_LOCKED; }
2571  }
2572 
2573  DebugTrace(-1, Dbg, "FatOpenVolume -> Iosb.Status = %08lx\n", Iosb.Status);
2574  } _SEH2_END;
2575 
2576  return Iosb;
2577 }
2578 
2579 
2580 //
2581 // Internal support routine
2582 //
2583 
2584 _Requires_lock_held_(_Global_critical_region_)
2585 IO_STATUS_BLOCK
2586 FatOpenRootDcb (
2587  _In_ PIRP_CONTEXT IrpContext,
2588  _Inout_ PFILE_OBJECT FileObject,
2589  _Inout_ PVCB Vcb,
2590  _In_ PACCESS_MASK DesiredAccess,
2591  _In_ USHORT ShareAccess,
2592  _In_ ULONG CreateDisposition
2593  )
2594 
2595 /*++
2596 
2597 Routine Description:
2598 
2599  This routine opens the root dcb for the volume
2600 
2601 Arguments:
2602 
2603  FileObject - Supplies the File object
2604 
2605  Vcb - Supplies the Vcb denoting the volume whose dcb is being opened.
2606 
2607  DesiredAccess - Supplies the desired access of the caller
2608 
2609  ShareAccess - Supplies the share access of the caller
2610 
2611  CreateDisposition - Supplies the create disposition for this operation
2612 
2613 Return Value:
2614 
2615  IO_STATUS_BLOCK - Returns the completion status for the operation
2616 
2617 Arguments:
2618 
2619 --*/
2620 
2621 {
2622  PDCB RootDcb;
2623  IO_STATUS_BLOCK Iosb = {0};
2624 
2625  //
2626  // The following variables are for abnormal termination
2627  //
2628 
2629  BOOLEAN UnwindShareAccess = FALSE;
2630  PCCB UnwindCcb = NULL;
2631  BOOLEAN UnwindCounts = FALSE;
2632  BOOLEAN RootDcbAcquired = FALSE;
2633 
2634  PAGED_CODE();
2635 
2636  DebugTrace(+1, Dbg, "FatOpenRootDcb...\n", 0);
2637 
2638  //
2639  // Locate the root dcb
2640  //
2641 
2642  RootDcb = Vcb->RootDcb;
2643 
2644  //
2645  // Get the Dcb exlcusive. This is important as cleanup does not
2646  // acquire the Vcb.
2647  //
2648 
2649  (VOID)FatAcquireExclusiveFcb( IrpContext, RootDcb );
2650  RootDcbAcquired = TRUE;
2651 
2652  _SEH2_TRY {
2653 
2654  //
2655  // Check the create disposition and desired access
2656  //
2657 
2658  if ((CreateDisposition != FILE_OPEN) &&
2659  (CreateDisposition != FILE_OPEN_IF)) {
2660 
2661  Iosb.Status = STATUS_ACCESS_DENIED;
2662  try_return( Iosb );
2663  }
2664 
2665  if (!FatCheckFileAccess( IrpContext,
2666  RootDcb->DirentFatFlags,
2667  DesiredAccess)) {
2668 
2669  Iosb.Status = STATUS_ACCESS_DENIED;
2670  try_return( Iosb );
2671  }
2672 
2673  //
2674  // If the Root dcb is already opened by someone then we need
2675  // to check the share access
2676  //
2677 
2678  if (RootDcb->OpenCount > 0) {
2679 
2680  if (!NT_SUCCESS(Iosb.Status = IoCheckShareAccess( *DesiredAccess,
2681  ShareAccess,
2682  FileObject,
2683  &RootDcb->ShareAccess,
2684  TRUE ))) {
2685 
2686  try_return( Iosb );
2687  }
2688 
2689  } else {
2690 
2691  IoSetShareAccess( *DesiredAccess,
2692  ShareAccess,
2693  FileObject,
2694  &RootDcb->ShareAccess );
2695  }
2696 
2697  UnwindShareAccess = TRUE;
2698 
2699  //
2700  // Setup the context and section object pointers, and update
2701  // our reference counts
2702  //
2703 
2704  FatSetFileObject( FileObject,
2705  UserDirectoryOpen,
2706  RootDcb,
2707  UnwindCcb = FatCreateCcb( IrpContext ));
2708 
2709  RootDcb->UncleanCount += 1;
2710  RootDcb->OpenCount += 1;
2711  Vcb->OpenFileCount += 1;
2712  if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount += 1; }
2713  UnwindCounts = TRUE;
2714 
2715  //
2716  // And set our status to success
2717  //
2718 
2719  Iosb.Status = STATUS_SUCCESS;
2720  Iosb.Information = FILE_OPENED;
2721 
2722  try_exit: NOTHING;
2723  } _SEH2_FINALLY {
2724 
2725  DebugUnwind( FatOpenRootDcb );
2726 
2727  //
2728  // If this is an abnormal termination then undo our work
2729  //
2730 
2731  if (_SEH2_AbnormalTermination()) {
2732 
2733  if (UnwindCounts) {
2734  RootDcb->UncleanCount -= 1;
2735  RootDcb->OpenCount -= 1;
2736  Vcb->OpenFileCount -= 1;
2737  if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount -= 1; }
2738  }
2739  if (UnwindCcb != NULL) { FatDeleteCcb( IrpContext, &UnwindCcb ); }
2740  if (UnwindShareAccess) { IoRemoveShareAccess( FileObject, &RootDcb->ShareAccess ); }
2741  }
2742 
2743  if (RootDcbAcquired) {
2744 
2745  FatReleaseFcb( IrpContext, RootDcb );
2746  }
2747 
2748  DebugTrace(-1, Dbg, "FatOpenRootDcb -> Iosb.Status = %08lx\n", Iosb.Status);
2749  } _SEH2_END;
2750 
2751  return Iosb;
2752 }
2753 
2754 
2755 //
2756 // Internal support routine
2757 //
2758 
2759 _Requires_lock_held_(_Global_critical_region_)
2760 IO_STATUS_BLOCK
2761 FatOpenExistingDcb (
2762  _In_ PIRP_CONTEXT IrpContext,
2763  _In_ PIO_STACK_LOCATION IrpSp,
2764  _Inout_ PFILE_OBJECT FileObject,
2765  _Inout_ PVCB Vcb,
2766  _Inout_ PDCB Dcb,
2767  _In_ PACCESS_MASK DesiredAccess,
2768  _In_ USHORT ShareAccess,
2769  _In_ ULONG CreateDisposition,
2770  _In_ BOOLEAN NoEaKnowledge,
2771  _In_ BOOLEAN DeleteOnClose,
2772  _In_ BOOLEAN OpenRequiringOplock,
2773  _In_ BOOLEAN FileNameOpenedDos,
2774  _Out_ PBOOLEAN OplockPostIrp
2775  )
2776 
2777 /*++
2778 
2779 Routine Description:
2780 
2781  This routine opens the specified existing dcb
2782 
2783 Arguments:
2784 
2785  FileObject - Supplies the File object
2786 
2787  Vcb - Supplies the Vcb denoting the volume containing the dcb
2788 
2789  Dcb - Supplies the already existing dcb
2790 
2791  DesiredAccess - Supplies the desired access of the caller
2792 
2793  ShareAccess - Supplies the share access of the caller
2794 
2795  CreateDisposition - Supplies the create disposition for this operation
2796 
2797  NoEaKnowledge - This opener doesn't understand Ea's and we fail this
2798  open if the file has NeedEa's.
2799 
2800  DeleteOnClose - The caller wants the file gone when the handle is closed
2801 
2802 Return Value:
2803 
2804  IO_STATUS_BLOCK - Returns the completion status for the operation
2805 
2806 --*/
2807 
2808 {
2809  IO_STATUS_BLOCK Iosb = {0};
2810  PBCB DirentBcb = NULL;
2811  PDIRENT Dirent;
2812 
2813  //
2814  // The following variables are for abnormal termination
2815  //
2816 
2817  BOOLEAN UnwindShareAccess = FALSE;
2818  PCCB UnwindCcb = NULL;
2819  BOOLEAN DcbAcquired = FALSE;
2820 
2821 #if (NTDDI_VERSION <= NTDDI_WIN7)
2822  UNREFERENCED_PARAMETER( OpenRequiringOplock );
2823 #endif
2824 
2825  UNREFERENCED_PARAMETER( IrpSp );
2826 
2827  PAGED_CODE();
2828 
2829  DebugTrace(+1, Dbg, "FatOpenExistingDcb...\n", 0);
2830 
2831  //
2832  // Get the Dcb exlcusive. This is important as cleanup does not
2833  // acquire the Vcb.
2834  //
2835 
2836  (VOID)FatAcquireExclusiveFcb( IrpContext, Dcb );
2837  DcbAcquired = TRUE;
2838 
2839  _SEH2_TRY {
2840 
2841 
2842  *OplockPostIrp = FALSE;
2843 
2844  //
2845  // Before spending any noticeable effort, see if we have the odd case
2846  // of someone trying to delete-on-close the root dcb. This will only
2847  // happen if we're hit with a null-filename relative open via the root.
2848  //
2849 
2850  if (NodeType(Dcb) == FAT_NTC_ROOT_DCB && DeleteOnClose) {
2851 
2852  Iosb.Status = STATUS_CANNOT_DELETE;
2853  try_return( Iosb );
2854  }
2855 
2856 #if (NTDDI_VERSION >= NTDDI_WIN8)
2857 
2858  //
2859  // Let's make sure that if the caller provided an oplock key that it
2860  // gets stored in the file object.
2861  //
2862 
2863  Iosb.Status = FsRtlCheckOplockEx( FatGetFcbOplock(Dcb),
2864  IrpContext->OriginatingIrp,
2865  OPLOCK_FLAG_OPLOCK_KEY_CHECK_ONLY,
2866  NULL,
2867  NULL,
2868  NULL );
2869 
2870  if (Iosb.Status != STATUS_SUCCESS) {
2871 
2872  try_return( NOTHING );
2873  }
2874 
2875 #endif
2876  //
2877  // If the caller has no Ea knowledge, we immediately check for
2878  // Need Ea's on the file. We don't need to check for ea's on the
2879  // root directory, because it never has any. Fat32 doesn't have
2880  // any, either.
2881  //
2882 
2883  if (NoEaKnowledge && NodeType(Dcb) != FAT_NTC_ROOT_DCB &&
2884  !FatIsFat32(Vcb)) {
2885 
2886  ULONG NeedEaCount;
2887 
2888  //
2889  // Get the dirent for the file and then check that the need
2890  // ea count is 0.
2891  //
2892 
2893  FatGetDirentFromFcbOrDcb( IrpContext,
2894  Dcb,
2895  FALSE,
2896  &Dirent,
2897  &DirentBcb );
2898 
2899  FatGetNeedEaCount( IrpContext,
2900  Vcb,
2901  Dirent,
2902  &NeedEaCount );
2903 
2904  FatUnpinBcb( IrpContext, DirentBcb );
2905 
2906  if (NeedEaCount != 0) {
2907 
2908  Iosb.Status = STATUS_ACCESS_DENIED;
2909  try_return( Iosb );
2910  }
2911  }
2912 
2913  //
2914  // Check the create disposition and desired access
2915  //
2916 
2917  if ((CreateDisposition != FILE_OPEN) &&
2918  (CreateDisposition != FILE_OPEN_IF)) {
2919 
2920  Iosb.Status = STATUS_OBJECT_NAME_COLLISION;
2921  try_return( Iosb );
2922  }
2923 
2924  if (!FatCheckFileAccess( IrpContext,
2925  Dcb->DirentFatFlags,
2926  DesiredAccess)) {
2927 
2928  Iosb.Status = STATUS_ACCESS_DENIED;
2929  try_return( Iosb );
2930  }
2931 
2932  //
2933  // If the dcb is already opened by someone then we need
2934  // to check the share access
2935  //
2936 
2937  if (Dcb->OpenCount > 0) {
2938 
2939  if (!NT_SUCCESS(Iosb.Status = FatCheckShareAccess( IrpContext,
2940  FileObject,
2941  Dcb,
2942  DesiredAccess,
2943  ShareAccess ))) {
2944 #if (NTDDI_VERSION >= NTDDI_WIN8)
2945 
2946  NTSTATUS OplockBreakStatus = STATUS_SUCCESS;
2947 
2948  //
2949  // If we got a sharing violation try to break outstanding handle
2950  // oplocks and retry the sharing check. If the caller specified
2951  // FILE_COMPLETE_IF_OPLOCKED we don't bother breaking the oplock;
2952  // we just return the sharing violation.
2953  //
2954 
2955  if ((Iosb.Status == STATUS_SHARING_VIOLATION) &&
2956  !FlagOn( IrpSp->Parameters.Create.Options, FILE_COMPLETE_IF_OPLOCKED )) {
2957 
2958  OplockBreakStatus = FsRtlOplockBreakH( FatGetFcbOplock(Dcb),
2959  IrpContext->OriginatingIrp,
2960  0,
2961  IrpContext,
2962  FatOplockComplete,
2963  FatPrePostIrp );
2964 
2965  //
2966  // If FsRtlOplockBreakH returned STATUS_PENDING, then the IRP
2967  // has been posted and we need to stop working.
2968  //
2969 
2970  if (OplockBreakStatus == STATUS_PENDING) {
2971 
2972  Iosb.Status = STATUS_PENDING;
2973  *OplockPostIrp = TRUE;
2974  try_return( NOTHING );
2975 
2976  //
2977  // If FsRtlOplockBreakH returned an error we want to return that now.
2978  //
2979 
2980  } else if (!NT_SUCCESS( OplockBreakStatus )) {
2981 
2982  Iosb.Status = OplockBreakStatus;
2983  try_return( Iosb );
2984 
2985  //
2986  // Otherwise FsRtlOplockBreakH returned STATUS_SUCCESS, indicating
2987  // that there is no oplock to be broken. The sharing violation is
2988  // returned in that case.
2989  //
2990 
2991  } else {
2992 
2993  NT_ASSERT( OplockBreakStatus == STATUS_SUCCESS );
2994 
2995  try_return( Iosb );
2996  }
2997 
2998  //
2999  // The initial sharing check failed with something other than sharing
3000  // violation (which should never happen, but let's be future-proof),
3001  // or we *did* get a sharing violation and the caller specified
3002  // FILE_COMPLETE_IF_OPLOCKED. Either way this create is over.
3003  //
3004 
3005  } else {
3006 
3007  try_return( Iosb );
3008  }
3009 #else
3010 
3011  try_return( Iosb );
3012 #endif
3013  }
3014  }
3015 
3016 #if (NTDDI_VERSION >= NTDDI_WIN8)
3017 
3018  //
3019  // Now check that we can continue based on the oplock state of the
3020  // directory. If there are no open handles yet we don't need to do
3021  // this check; oplocks can only exist when there are handles.
3022  //
3023 
3024  if (Dcb->UncleanCount != 0) {
3025 
3026  Iosb.Status = FsRtlCheckOplock( FatGetFcbOplock(Dcb),
3027  IrpContext->OriginatingIrp,
3028  IrpContext,
3029  FatOplockComplete,
3030  FatPrePostIrp );
3031  }
3032 
3033  //
3034  // if FsRtlCheckOplock returns STATUS_PENDING the IRP has been posted
3035  // to service an oplock break and we need to leave now.
3036  //
3037 
3038  if (Iosb.Status == STATUS_PENDING) {
3039 
3040  *OplockPostIrp = TRUE;
3041  try_return( NOTHING );
3042  }
3043 
3044  //
3045  // If the caller wants atomic create-with-oplock semantics, tell
3046  // the oplock package. We haven't incremented the Fcb's UncleanCount
3047  // for this create yet, so add that in on the call.
3048  //
3049 
3050  if (OpenRequiringOplock &&
3051  (Iosb.Status == STATUS_SUCCESS)) {
3052 
3053  Iosb.Status = FsRtlOplockFsctrl( FatGetFcbOplock(Dcb),
3054  IrpContext->OriginatingIrp,
3055  (Dcb->UncleanCount + 1) );
3056  }
3057 
3058  //
3059  // If we've encountered a failure we need to leave. FsRtlCheckOplock
3060  // will have returned STATUS_OPLOCK_BREAK_IN_PROGRESS if it initiated
3061  // and oplock break and the caller specified FILE_COMPLETE_IF_OPLOCKED
3062  // on the create call. That's an NT_SUCCESS code, so we need to keep
3063  // going.
3064  //
3065 
3066  if ((Iosb.Status != STATUS_SUCCESS) &&
3067  (Iosb.Status != STATUS_OPLOCK_BREAK_IN_PROGRESS)) {
3068 
3069  try_return( NOTHING );
3070  }
3071 
3072 #endif
3073 
3074  //
3075  // Now that we're done with the oplock work update the share counts.
3076  // If the Dcb isn't yet opened we just set the share access rather than
3077  // update it.
3078  //
3079 
3080  if (Dcb->OpenCount > 0) {
3081 
3082  IoUpdateShareAccess( FileObject, &Dcb->ShareAccess );
3083 
3084  } else {
3085 
3086  IoSetShareAccess( *DesiredAccess,
3087  ShareAccess,
3088  FileObject,
3089  &Dcb->ShareAccess );
3090  }
3091 
3092  UnwindShareAccess = TRUE;
3093 
3094  //
3095  // Setup the context and section object pointers, and update
3096  // our reference counts
3097  //
3098 
3099  FatSetFileObject( FileObject,
3100  UserDirectoryOpen,
3101  Dcb,
3102  UnwindCcb = FatCreateCcb( IrpContext ));
3103 
3104  Dcb->UncleanCount += 1;
3105  Dcb->OpenCount += 1;
3106  Vcb->OpenFileCount += 1;
3107  if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount += 1; }
3108 
3109  //
3110  // Mark the delete on close bit if the caller asked for that.
3111  //
3112 
3113  {
3114  PCCB Ccb = (PCCB)FileObject->FsContext2;
3115 
3116 
3117  if (DeleteOnClose) {
3118 
3119  SetFlag( Ccb->Flags, CCB_FLAG_DELETE_ON_CLOSE );
3120  }
3121  if (FileNameOpenedDos) {
3122 
3123  SetFlag( Ccb->Flags, CCB_FLAG_OPENED_BY_SHORTNAME );
3124  }
3125 
3126  }
3127 
3128 
3129  //
3130  // In case this was set, clear it now.
3131  //
3132 
3133  ClearFlag(Dcb->FcbState, FCB_STATE_DELAY_CLOSE);
3134 
3135  //
3136  // And set our status to success
3137  //
3138 
3139  Iosb.Status = STATUS_SUCCESS;
3140  Iosb.Information = FILE_OPENED;
3141 
3142  try_exit: NOTHING;
3143  } _SEH2_FINALLY {
3144 
3145  DebugUnwind( FatOpenExistingDcb );
3146 
3147  //
3148  // Unpin the Dirent Bcb if pinned.
3149  //
3150 
3151  FatUnpinBcb( IrpContext, DirentBcb );
3152 
3153  //
3154  // If this is an abnormal termination then undo our work
3155  //
3156 
3157  if (_SEH2_AbnormalTermination()) {
3158 
3159  if (UnwindCcb != NULL) { FatDeleteCcb( IrpContext, &UnwindCcb ); }
3160  if (UnwindShareAccess) { IoRemoveShareAccess( FileObject, &Dcb->ShareAccess ); }
3161  }
3162 
3163  if (DcbAcquired) {
3164 
3165  FatReleaseFcb( IrpContext, Dcb );
3166  }
3167 
3168  DebugTrace(-1, Dbg, "FatOpenExistingDcb -> Iosb.Status = %08lx\n", Iosb.Status);
3169  } _SEH2_END;
3170 
3171  return Iosb;
3172 }
3173 
3174 
3175 //
3176 // Internal support routine
3177 //
3178 
3179 _Requires_lock_held_(_Global_critical_region_)
3180 IO_STATUS_BLOCK
3181 FatOpenExistingFcb (
3182  _In_ PIRP_CONTEXT IrpContext,
3183  _In_ PIO_STACK_LOCATION IrpSp,
3184  _Inout_ PFILE_OBJECT FileObject,
3185  _Inout_ PVCB Vcb,
3186  _Inout_ PFCB Fcb,
3187  _In_ PACCESS_MASK DesiredAccess,
3188  _In_ USHORT ShareAccess,
3189  _In_ ULONG AllocationSize,
3190  _In_ PFILE_FULL_EA_INFORMATION EaBuffer,
3191  _In_ ULONG EaLength,
3192  _In_ USHORT FileAttributes,
3193  _In_ ULONG CreateDisposition,
3194  _In_ BOOLEAN NoEaKnowledge,
3195  _In_ BOOLEAN DeleteOnClose,
3196  _In_ BOOLEAN OpenRequiringOplock,
3197  _In_ BOOLEAN FileNameOpenedDos,
3198  _Out_ PBOOLEAN OplockPostIrp
3199  )
3200 
3201 /*++
3202 
3203 Routine Description:
3204 
3205  This routine opens the specified existing fcb
3206 
3207 Arguments:
3208 
3209  FileObject - Supplies the File object
3210 
3211  Vcb - Supplies the Vcb denoting the volume containing the Fcb
3212 
3213  Fcb - Supplies the already existing fcb
3214 
3215  DesiredAccess - Supplies the desired access of the caller
3216 
3217  ShareAccess - Supplies the share access of the caller
3218 
3219  AllocationSize - Supplies the initial allocation if the file is being
3220  superseded or overwritten
3221 
3222  EaBuffer - Supplies the Ea set if the file is being superseded or
3223  overwritten
3224 
3225  EaLength - Supplies the size, in byte, of the EaBuffer
3226 
3227  FileAttributes - Supplies file attributes to use if the file is being
3228  superseded or overwritten
3229 
3230  CreateDisposition - Supplies the create disposition for this operation
3231 
3232  NoEaKnowledge - This opener doesn't understand Ea's and we fail this
3233  open if the file has NeedEa's.
3234 
3235  DeleteOnClose - The caller wants the file gone when the handle is closed
3236 
3237  OpenRequiringOplock - The caller provided the FILE_OPEN_REQUIRING_OPLOCK option.
3238 
3239  FileNameOpenedDos - The caller hit the short side of the name pair finding
3240  this file
3241 
3242  OplockPostIrp - Address to store boolean indicating if the Irp needs to
3243  be posted to the Fsp.
3244 
3245 Return Value:
3246 
3247  IO_STATUS_BLOCK - Returns the completion status for the operation
3248 
3249 --*/
3250 
3251 {
3252  IO_STATUS_BLOCK Iosb = {0};
3253 
3254  PBCB DirentBcb = NULL;
3255  PDIRENT Dirent;
3256 
3257  ACCESS_MASK AddedAccess = 0;
3258 
3259  //
3260  // The following variables are for abnormal termination
3261  //
3262 
3263  BOOLEAN UnwindShareAccess = FALSE;
3264  PCCB UnwindCcb = NULL;
3265  BOOLEAN DecrementFcbOpenCount = FALSE;
3266  BOOLEAN FcbAcquired = FALSE;
3267 
3268 
3269  PAGED_CODE();
3270 
3271  DebugTrace(+1, Dbg, "FatOpenExistingFcb...\n", 0);
3272 
3273  //
3274  // Get the Fcb exlcusive. This is important as cleanup does not
3275  // acquire the Vcb.
3276  //
3277 
3278  (VOID)FatAcquireExclusiveFcb( IrpContext, Fcb );
3279  FcbAcquired = TRUE;
3280 
3281  _SEH2_TRY {
3282 
3283 
3284  *OplockPostIrp = FALSE;
3285 
3286 #if (NTDDI_VERSION >= NTDDI_WIN7)
3287 
3288  //
3289  // Let's make sure that if the caller provided an oplock key that it
3290  // gets stored in the file object.
3291  //
3292 
3293  Iosb.Status = FsRtlCheckOplockEx( FatGetFcbOplock(Fcb),
3294  IrpContext->OriginatingIrp,
3295  OPLOCK_FLAG_OPLOCK_KEY_CHECK_ONLY,
3296  NULL,
3297  NULL,
3298  NULL );
3299 
3300  if (Iosb.Status != STATUS_SUCCESS) {
3301 
3302  try_return( NOTHING );
3303  }
3304 #endif
3305 
3306  //
3307  // Take special action if there is a current batch oplock or
3308  // batch oplock break in process on the Fcb.
3309  //
3310 
3311  if (FsRtlCurrentBatchOplock( FatGetFcbOplock(Fcb) )) {
3312 
3313  //
3314  // We remember if a batch oplock break is underway for the
3315  // case where the sharing check fails.
3316  //
3317 
3318  Iosb.Information = FILE_OPBATCH_BREAK_UNDERWAY;
3319 
3320  Iosb.Status = FsRtlCheckOplock( FatGetFcbOplock(Fcb),
3321  IrpContext->OriginatingIrp,
3322  IrpContext,
3323  FatOplockComplete,
3324  FatPrePostIrp );
3325 
3326  //
3327  // if FsRtlCheckOplock returns STATUS_PENDING the IRP has been posted
3328  // to service an oplock break and we need to leave now.
3329  //
3330 
3331  if (Iosb.Status == STATUS_PENDING) {
3332 
3333  *OplockPostIrp = TRUE;
3334  try_return( NOTHING );
3335  }
3336  }
3337 
3338  //
3339  // Check if the user wanted to create the file, also special case
3340  // the supersede and overwrite options. Those add additional,
3341  // possibly only implied, desired accesses to the caller, which
3342  // we must be careful to pull back off if the caller did not actually
3343  // request them.
3344  //
3345  // In other words, check against the implied access, but do not modify
3346  // share access as a result.
3347  //
3348 
3349  if (CreateDisposition == FILE_CREATE) {
3350 
3351  Iosb.Status = STATUS_OBJECT_NAME_COLLISION;
3352  try_return( Iosb );
3353 
3354  } else if (CreateDisposition == FILE_SUPERSEDE) {
3355 
3356  SetFlag( AddedAccess,
3357  DELETE & ~(*DesiredAccess) );
3358 
3359  *DesiredAccess |= DELETE;
3360 
3361  } else if ((CreateDisposition == FILE_OVERWRITE) ||
3362  (CreateDisposition == FILE_OVERWRITE_IF)) {
3363 
3364  SetFlag( AddedAccess,
3365  (FILE_WRITE_DATA | FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES) & ~(*DesiredAccess) );
3366 
3367  *DesiredAccess |= FILE_WRITE_DATA | FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES;
3368  }
3369 
3370  //
3371  // Check the desired access
3372  //
3373 
3374  if (!FatCheckFileAccess( IrpContext,
3375  Fcb->DirentFatFlags,
3376  DesiredAccess )) {
3377 
3378  Iosb.Status = STATUS_ACCESS_DENIED;
3379  try_return( Iosb );
3380  }
3381 
3382 
3383  //
3384  // Check for trying to delete a read only file.
3385  //
3386 
3387  if (DeleteOnClose &&
3388  FlagOn( Fcb->DirentFatFlags, FAT_DIRENT_ATTR_READ_ONLY )) {
3389 
3390  Iosb.Status = STATUS_CANNOT_DELETE;
3391  try_return( Iosb );
3392  }
3393 
3394  //
3395  // If we are asked to do an overwrite or supersede operation then
3396  // deny access for files where the file attributes for system and
3397  // hidden do not match
3398  //
3399 
3400  if ((CreateDisposition == FILE_SUPERSEDE) ||
3401  (CreateDisposition == FILE_OVERWRITE) ||
3402  (CreateDisposition == FILE_OVERWRITE_IF)) {
3403 
3404  BOOLEAN Hidden;
3405  BOOLEAN System;
3406 
3407  Hidden = BooleanFlagOn(Fcb->DirentFatFlags, FAT_DIRENT_ATTR_HIDDEN );
3408  System = BooleanFlagOn(Fcb->DirentFatFlags, FAT_DIRENT_ATTR_SYSTEM );
3409 
3410  if ((Hidden && !FlagOn(FileAttributes, FILE_ATTRIBUTE_HIDDEN)) ||
3411  (System && !FlagOn(FileAttributes, FILE_ATTRIBUTE_SYSTEM))) {
3412 
3413  DebugTrace(0, Dbg, "The hidden and/or system bits do not match\n", 0);
3414 
3415 
3416  Iosb.Status = STATUS_ACCESS_DENIED;
3417  try_return( Iosb );
3418  }
3419 
3420  //
3421  // If this media is write protected, don't even try the create.
3422  //
3423 
3424  if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_WRITE_PROTECTED)) {
3425 
3426  //
3427  // Set the real device for the pop-up info, and set the verify
3428  // bit in the device object, so that we will force a verify
3429  // in case the user put the correct media back in.
3430  //
3431 
3432  IoSetHardErrorOrVerifyDevice( IrpContext->OriginatingIrp,
3433  Vcb->Vpb->RealDevice );
3434 
3435  SetFlag(Vcb->Vpb->RealDevice->Flags, DO_VERIFY_VOLUME);
3436 
3437  FatRaiseStatus( IrpContext, STATUS_MEDIA_WRITE_PROTECTED );
3438  }
3439  }
3440 
3441  //
3442  // Check if the Fcb has the proper share access. This routine will also
3443  // check for writable user secions if the user did not allow write sharing.
3444  //
3445 
3446  if (!NT_SUCCESS(Iosb.Status = FatCheckShareAccess( IrpContext,
3447  FileObject,
3448  Fcb,
3449  DesiredAccess,
3450  ShareAccess ))) {
3451 
3452 #if (NTDDI_VERSION >= NTDDI_WIN7)
3453 
3454  NTSTATUS OplockBreakStatus = STATUS_SUCCESS;
3455 
3456  //
3457  // If we got a sharing violation try to break outstanding handle
3458  // oplocks and retry the sharing check. If the caller specified
3459  // FILE_COMPLETE_IF_OPLOCKED we don't bother breaking the oplock;
3460  // we just return the sharing violation.
3461  //
3462 
3463  if ((Iosb.Status == STATUS_SHARING_VIOLATION) &&
3464  !FlagOn( IrpSp->Parameters.Create.Options, FILE_COMPLETE_IF_OPLOCKED )) {
3465 
3466  OplockBreakStatus = FsRtlOplockBreakH( FatGetFcbOplock(Fcb),
3467  IrpContext->OriginatingIrp,
3468  0,
3469  IrpContext,
3470  FatOplockComplete,
3471  FatPrePostIrp );
3472 
3473  //
3474  // If FsRtlOplockBreakH returned STATUS_PENDING, then the IRP
3475  // has been posted and we need to stop working.
3476  //
3477 
3478  if (OplockBreakStatus == STATUS_PENDING) {
3479 
3480  Iosb.Status = STATUS_PENDING;
3481  *OplockPostIrp = TRUE;
3482  try_return( NOTHING );
3483 
3484  //
3485  // If FsRtlOplockBreakH returned an error we want to return that now.
3486  //
3487 
3488  } else if (!NT_SUCCESS( OplockBreakStatus )) {
3489 
3490  Iosb.Status = OplockBreakStatus;
3491  try_return( Iosb );
3492 
3493  //
3494  // Otherwise FsRtlOplockBreakH returned STATUS_SUCCESS, indicating
3495  // that there is no oplock to be broken. The sharing violation is
3496  // returned in that case.
3497  //
3498 
3499  } else {
3500 
3501  NT_ASSERT( OplockBreakStatus == STATUS_SUCCESS );
3502 
3503  try_return( Iosb );
3504  }
3505 
3506  //
3507  // The initial sharing check failed with something other than sharing
3508  // violation (which should never happen, but let's be future-proof),
3509  // or we *did* get a sharing violation and the caller specified
3510  // FILE_COMPLETE_IF_OPLOCKED. Either way this create is over.
3511  //
3512 
3513  } else {
3514 
3515  try_return( Iosb );
3516  }
3517 
3518 #else
3519 
3520  try_return( Iosb );
3521 
3522 #endif
3523  }
3524 
3525  //
3526  // Now check that we can continue based on the oplock state of the
3527  // file. If there are no open handles yet we don't need to do this
3528  // check; oplocks can only exist when there are handles.
3529  //
3530  // It is important that we modified the DesiredAccess in place so
3531  // that the Oplock check proceeds against any added access we had
3532  // to give the caller.
3533  //
3534 
3535  if (Fcb->UncleanCount != 0) {
3536 
3537  Iosb.Status = FsRtlCheckOplock( FatGetFcbOplock(Fcb),
3538  IrpContext->OriginatingIrp,
3539  IrpContext,
3540  FatOplockComplete,
3541  FatPrePostIrp );
3542  }
3543 
3544  //
3545  // if FsRtlCheckOplock returns STATUS_PENDING the IRP has been posted
3546  // to service an oplock break and we need to leave now.
3547  //
3548 
3549  if (Iosb.Status == STATUS_PENDING) {
3550 
3551  *OplockPostIrp = TRUE;
3552  try_return( NOTHING );
3553  }
3554 
3555  //
3556  // If the caller wants atomic create-with-oplock semantics, tell
3557  // the oplock package. We haven't incremented the Fcb's UncleanCount
3558  // for this create yet, so add that in on the call.
3559  //
3560 
3561  if (OpenRequiringOplock &&
3562  (Iosb.Status == STATUS_SUCCESS)) {
3563 
3564  Iosb.Status = FsRtlOplockFsctrl( FatGetFcbOplock(Fcb),
3565  IrpContext->OriginatingIrp,
3566  (Fcb->UncleanCount + 1) );
3567  }
3568 
3569  //
3570  // If we've encountered a failure we need to leave. FsRtlCheckOplock
3571  // will have returned STATUS_OPLOCK_BREAK_IN_PROGRESS if it initiated
3572  // and oplock break and the caller specified FILE_COMPLETE_IF_OPLOCKED
3573  // on the create call. That's an NT_SUCCESS code, so we need to keep
3574  // going.
3575  //
3576 
3577  if ((Iosb.Status != STATUS_SUCCESS) &&
3578  (Iosb.Status != STATUS_OPLOCK_BREAK_IN_PROGRESS)) {
3579 
3580  try_return( NOTHING );
3581  }
3582 
3583  //
3584  // Set the flag indicating if Fast I/O is possible
3585  //
3586 
3587  Fcb->Header.IsFastIoPossible = FatIsFastIoPossible( Fcb );
3588 
3589  //
3590  // If the user wants write access access to the file make sure there
3591  // is not a process mapping this file as an image. Any attempt to
3592  // delete the file will be stopped in fileinfo.c
3593  //
3594  // If the user wants to delete on close, we must check at this
3595  // point though.
3596  //
3597 
3598  if (FlagOn(*DesiredAccess, FILE_WRITE_DATA) || DeleteOnClose) {
3599 
3600  Fcb->OpenCount += 1;
3601  DecrementFcbOpenCount = TRUE;
3602 
3603  if (!MmFlushImageSection( &Fcb->NonPaged->SectionObjectPointers,
3604  MmFlushForWrite )) {
3605 
3606  Iosb.Status = DeleteOnClose ? STATUS_CANNOT_DELETE :
3607  STATUS_SHARING_VIOLATION;
3608  try_return( Iosb );
3609  }
3610  }
3611 
3612  //
3613  // If this is a non-cached open on a non-paging file, and there
3614  // are no open cached handles, but there is a still a data
3615  // section, attempt a flush and purge operation to avoid cache
3616  // coherency overhead later. We ignore any I/O errors from
3617  // the flush.
3618  //
3619  // We set the CREATE_IN_PROGRESS flag to prevent the Fcb from
3620  // going away out from underneath us.
3621  //
3622 
3623  if (FlagOn( FileObject->Flags, FO_NO_INTERMEDIATE_BUFFERING ) &&
3624  (Fcb->UncleanCount == Fcb->NonCachedUncleanCount) &&
3625  (Fcb->NonPaged->SectionObjectPointers.DataSectionObject != NULL) &&
3626  !FlagOn( Fcb->FcbState, FCB_STATE_PAGING_FILE )) {
3627 
3628  SetFlag(Fcb->Vcb->VcbState, VCB_STATE_FLAG_CREATE_IN_PROGRESS);
3629 
3630  CcFlushCache( &Fcb->NonPaged->SectionObjectPointers, NULL, 0, NULL );
3631 
3632  //
3633  // Grab and release PagingIo to serialize ourselves with the lazy writer.
3634  // This will work to ensure that all IO has completed on the cached
3635  // data and we will succesfully tear away the cache section.
3636  //
3637 
3638  ExAcquireResourceExclusiveLite( Fcb->Header.PagingIoResource, TRUE);
3639  ExReleaseResourceLite( Fcb->Header.PagingIoResource );
3640 
3641  CcPurgeCacheSection( &Fcb->NonPaged->SectionObjectPointers,
3642  NULL,
3643  0,
3644  FALSE );
3645 
3646  ClearFlag(Fcb->Vcb->VcbState, VCB_STATE_FLAG_CREATE_IN_PROGRESS);
3647  }
3648 
3649  //
3650  // Check if the user only wanted to open the file
3651  //
3652 
3653  if ((CreateDisposition == FILE_OPEN) ||
3654  (CreateDisposition == FILE_OPEN_IF)) {
3655 
3656  DebugTrace(0, Dbg, "Doing open operation\n", 0);
3657 
3658  //
3659  // If the caller has no Ea knowledge, we immediately check for
3660  // Need Ea's on the file.
3661  //
3662 
3663  if (NoEaKnowledge && !FatIsFat32(Vcb)) {
3664 
3665  ULONG NeedEaCount;
3666 
3667  //
3668  // Get the dirent for the file and then check that the need
3669  // ea count is 0.
3670  //
3671 
3672  FatGetDirentFromFcbOrDcb( IrpContext,
3673  Fcb,
3674  FALSE,
3675  &Dirent,
3676  &DirentBcb );
3677 
3678  FatGetNeedEaCount( IrpContext,
3679  Vcb,
3680  Dirent,
3681  &NeedEaCount );
3682 
3683  FatUnpinBcb( IrpContext, DirentBcb );
3684 
3685  if (NeedEaCount != 0) {
3686 
3687  Iosb.Status = STATUS_ACCESS_DENIED;
3688  try_return( Iosb );
3689  }
3690  }
3691 
3692  //
3693  // Everything checks out okay, so setup the context and
3694  // section object pointers.
3695  //
3696 
3697  FatSetFileObject( FileObject,
3698  UserFileOpen,
3699  Fcb,
3700  UnwindCcb = FatCreateCcb( IrpContext ));
3701 
3702  FileObject->SectionObjectPointer = &Fcb->NonPaged->SectionObjectPointers;
3703 
3704  //
3705  // Fill in the information field, the status field is already
3706  // set.
3707  //
3708 
3709  Iosb.Information = FILE_OPENED;
3710 
3711  try_return( Iosb );
3712  }
3713 
3714  //
3715  // Check if we are to supersede/overwrite the file, we can wait for
3716  // any I/O at this point
3717  //
3718 
3719  if ((CreateDisposition == FILE_SUPERSEDE) ||
3720  (CreateDisposition == FILE_OVERWRITE) ||
3721  (CreateDisposition == FILE_OVERWRITE_IF)) {
3722 
3723  NTSTATUS OldStatus;
3724 
3725  DebugTrace(0, Dbg, "Doing supersede/overwrite operation\n", 0);
3726 
3727  //
3728  // We remember the previous status code because it may contain
3729  // information about the oplock status.
3730  //
3731 
3732  OldStatus = Iosb.Status;
3733 
3734  //
3735  // Determine the granted access for this operation now.
3736  //
3737 
3738  if (!NT_SUCCESS( Iosb.Status = FatCheckSystemSecurityAccess( IrpContext ))) {
3739 
3740  try_return( Iosb );
3741  }
3742 
3743  //
3744  // And overwrite the file.
3745  //
3746 
3747  Iosb = FatSupersedeOrOverwriteFile( IrpContext,
3748  FileObject,
3749  Fcb,
3750  AllocationSize,
3751  EaBuffer,
3752  EaLength,
3753  FileAttributes,
3754  CreateDisposition,
3755  NoEaKnowledge );
3756 
3757  if (Iosb.Status == STATUS_SUCCESS) {
3758 
3759  Iosb.Status = OldStatus;
3760  }
3761 
3762  try_return( Iosb );
3763  }
3764 
3765  //
3766  // If we ever get here then the I/O system gave us some bad input
3767  //
3768 
3769 #ifdef _MSC_VER
3770 #pragma prefast( suppress:28159, "things are seriously wrong if we get here" )
3771 #endif
3772  FatBugCheck( CreateDisposition, 0, 0 );
3773 
3774  try_exit: NOTHING;
3775 
3776  //
3777  // Update the share access and counts if successful
3778  //
3779 
3780  if ((Iosb.Status != STATUS_PENDING) && NT_SUCCESS(Iosb.Status)) {
3781 
3782  //
3783  // Now, we may have added some access bits above to indicate the access
3784  // this caller would conflict with (as opposed to what they get) in order
3785  // to perform the overwrite/supersede. We need to make a call to that will
3786  // recalculate the bits in the fileobject to reflect the real access they
3787  // will get.
3788  //
3789 
3790  if (AddedAccess) {
3791 
3792  NTSTATUS Status;
3793 
3794  ClearFlag( *DesiredAccess, AddedAccess );
3795 
3796 #ifdef _MSC_VER
3797 #pragma prefast( suppress:28931, "it needs to be there for debug assert" );
3798 #endif
3799  Status = IoCheckShareAccess( *DesiredAccess,
3800  ShareAccess,
3801  FileObject,
3802  &Fcb->ShareAccess,
3803  TRUE );
3804 
3805  //
3806  // It must be the case that we are really asking for less access, so
3807  // any conflict must have been detected before this point.
3808  //
3809 
3810  NT_ASSERT( Status == STATUS_SUCCESS );
3811 
3812  } else {
3813 
3814  IoUpdateShareAccess( FileObject, &Fcb->ShareAccess );
3815  }
3816 
3817  UnwindShareAccess = TRUE;
3818 
3819  //
3820  // In case this was set, clear it now.
3821  //
3822 
3823  ClearFlag(Fcb->FcbState, FCB_STATE_DELAY_CLOSE);
3824 
3825  Fcb->UncleanCount += 1;
3826  Fcb->OpenCount += 1;
3827  if (FlagOn(FileObject->Flags, FO_NO_INTERMEDIATE_BUFFERING)) {
3828  Fcb->NonCachedUncleanCount += 1;
3829  }
3830  Vcb->OpenFileCount += 1;
3831  if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount += 1; }
3832 
3833  {
3834  PCCB Ccb;
3835 
3836  Ccb = (PCCB)FileObject->FsContext2;
3837 
3838  //
3839  // Mark the DeleteOnClose bit if the operation was successful.
3840  //
3841 
3842  if ( DeleteOnClose ) {
3843 
3844  SetFlag( Ccb->Flags, CCB_FLAG_DELETE_ON_CLOSE );
3845  }
3846 
3847  //
3848  // Mark the OpenedByShortName bit if the operation was successful.
3849  //
3850 
3851  if ( FileNameOpenedDos ) {
3852 
3853  SetFlag( Ccb->Flags, CCB_FLAG_OPENED_BY_SHORTNAME );
3854  }
3855 
3856  //
3857  // Mark the ManageVolumeAccess bit if the privilege is held.
3858  //
3859 
3860  if (FatCheckManageVolumeAccess( IrpContext,
3861  IrpSp->Parameters.Create.SecurityContext->AccessState,
3862  (KPROCESSOR_MODE)( FlagOn( IrpSp->Flags, SL_FORCE_ACCESS_CHECK ) ?
3863  UserMode :
3864  IrpContext->OriginatingIrp->RequestorMode ))) {
3865 
3866  SetFlag( Ccb->Flags, CCB_FLAG_MANAGE_VOLUME_ACCESS );
3867  }
3868  }
3869 
3870 
3871  }
3872 
3873  } _SEH2_FINALLY {
3874 
3875  DebugUnwind( FatOpenExistingFcb );
3876 
3877  //
3878  // Unpin the Dirent Bcb if pinned.
3879  //
3880 
3881  FatUnpinBcb( IrpContext, DirentBcb );
3882 
3883  //
3884  // If this is an abnormal termination then undo our work
3885  //
3886 
3887  if (_SEH2_AbnormalTermination()) {
3888 
3889  if (UnwindCcb != NULL) { FatDeleteCcb( IrpContext, &UnwindCcb ); }
3890  if (UnwindShareAccess) { IoRemoveShareAccess( FileObject, &Fcb->ShareAccess ); }
3891  }
3892 
3893  if (DecrementFcbOpenCount) {
3894 
3895  Fcb->OpenCount -= 1;
3896 
3897  if (Fcb->OpenCount == 0) {
3898  if (ARGUMENT_PRESENT( FileObject )) {
3899  FileObject->SectionObjectPointer = NULL;
3900  }
3901  FatDeleteFcb( IrpContext, &Fcb );
3902  FcbAcquired = FALSE;
3903  }
3904  }
3905 
3906  if (FcbAcquired) {
3907 
3908  FatReleaseFcb( IrpContext, Fcb );
3909  }
3910 
3911  DebugTrace(-1, Dbg, "FatOpenExistingFcb -> Iosb.Status = %08lx\n", Iosb.Status);
3912  } _SEH2_END;
3913 
3914  return Iosb;
3915 }
3916 
3917 //
3918 // Internal support routine
3919 //
3920 
3921 _Requires_lock_held_(_Global_critical_region_)
3922 IO_STATUS_BLOCK
3923 FatOpenTargetDirectory (
3924  _In_ PIRP_CONTEXT IrpContext,
3925  _Inout_ PFILE_OBJECT FileObject,
3926  _Inout_ PDCB Dcb,
3927  _In_ PACCESS_MASK DesiredAccess,
3928  _In_ USHORT ShareAccess,
3929  _In_ BOOLEAN DoesNameExist,
3930  _In_ BOOLEAN FileNameOpenedDos
3931  )
3932 
3933 /*++
3934 
3935 Routine Description:
3936 
3937  This routine opens the target directory and replaces the name in the
3938  file object with the remaining name.
3939 
3940 Arguments:
3941 
3942  FileObject - Supplies the File object
3943 
3944  Dcb - Supplies an already existing dcb that we are going to open
3945 
3946  DesiredAccess - Supplies the desired access of the caller
3947 
3948  ShareAccess - Supplies the share access of the caller
3949 
3950  DoesNameExist - Indicates if the file name already exists in the
3951  target directory.
3952 
3953 
3954 Return Value:
3955 
3956  IO_STATUS_BLOCK - Returns the completion status for the operation
3957 
3958 --*/
3959 
3960 {
3961  IO_STATUS_BLOCK Iosb = {0};
3962 
3963  //
3964  // The following variables are for abnormal termination
3965  //
3966 
3967  BOOLEAN UnwindShareAccess = FALSE;
3968  PCCB UnwindCcb = NULL;
3969  BOOLEAN DcbAcquired = FALSE;
3970 
3971  PAGED_CODE();
3972 
3973  DebugTrace(+1, Dbg, "FatOpenTargetDirectory...\n", 0);
3974 
3975  //
3976  // Get the Dcb exlcusive. This is important as cleanup does not
3977  // acquire the Vcb.
3978  //
3979 
3980  (VOID)FatAcquireExclusiveFcb( IrpContext, Dcb );
3981  DcbAcquired = TRUE;
3982 
3983  _SEH2_TRY {
3984 
3985  ULONG i;
3986 
3987  //
3988  // If the Dcb is already opened by someone then we need
3989  // to check the share access
3990  //
3991 
3992  if (Dcb->OpenCount > 0) {
3993 
3994  if (!NT_SUCCESS(Iosb.Status = IoCheckShareAccess( *DesiredAccess,
3995  ShareAccess,
3996  FileObject,
3997  &Dcb->ShareAccess,
3998  TRUE ))) {
3999 
4000  try_return( Iosb );
4001  }
4002 
4003  } else {
4004 
4005  IoSetShareAccess( *DesiredAccess,
4006  ShareAccess,
4007  FileObject,
4008  &Dcb->ShareAccess );
4009  }
4010 
4011  UnwindShareAccess = TRUE;
4012 
4013  //
4014  // Setup the context and section object pointers, and update
4015  // our reference counts
4016  //
4017 
4018  FatSetFileObject( FileObject,
4019  UserDirectoryOpen,
4020  Dcb,
4021  UnwindCcb = FatCreateCcb( IrpContext ));
4022 
4023  Dcb->UncleanCount += 1;
4024  Dcb->OpenCount += 1;
4025  Dcb->Vcb->OpenFileCount += 1;
4026  if (IsFileObjectReadOnly(FileObject)) { Dcb->Vcb->ReadOnlyCount += 1; }
4027 
4028  //
4029  // Update the name in the file object, by definition the remaining
4030  // part must be shorter than the original file name so we'll just
4031  // overwrite the file name.
4032  //
4033 
4034  i = FileObject->FileName.Length/sizeof(WCHAR) - 1;
4035 
4036  //
4037  // Get rid of a trailing backslash
4038  //
4039 
4040  if (FileObject->FileName.Buffer[i] == L'\\') {
4041 
4042  NT_ASSERT(i != 0);
4043 
4044  FileObject->FileName.Length -= sizeof(WCHAR);
4045  i -= 1;
4046  }
4047 
4048  //
4049  // Find the first non-backslash character. i will be its index.
4050  //
4051 
4052  while (TRUE) {
4053 
4054  if (FileObject->FileName.Buffer[i] == L'\\') {
4055 
4056  i += 1;
4057  break;
4058  }
4059 
4060  if (i == 0) {
4061  break;
4062  }
4063 
4064  i--;
4065  }
4066 
4067  if (i) {
4068 
4069  FileObject->FileName.Length -= (USHORT)(i * sizeof(WCHAR));
4070 
4071  RtlMoveMemory( &FileObject->FileName.Buffer[0],
4072  &FileObject->FileName.Buffer[i],
4073  FileObject->FileName.Length );
4074  }
4075 
4076  //
4077  // And set our status to success
4078  //
4079 
4080  Iosb.Status = STATUS_SUCCESS;
4081  Iosb.Information = (DoesNameExist ? FILE_EXISTS : FILE_DOES_NOT_EXIST);
4082 
4083  if ( ( NT_SUCCESS(Iosb.Status) ) && ( DoesNameExist ) ) {
4084  PCCB Ccb;
4085 
4086  Ccb = (PCCB)FileObject->FsContext2;
4087 
4088  //
4089  // Mark the OpenedByShortName bit if the operation was successful.
4090  //
4091 
4092  if ( FileNameOpenedDos ) {
4093 
4094  SetFlag( Ccb->Flags, CCB_FLAG_OPENED_BY_SHORTNAME );
4095  }
4096  }
4097 
4098  try_exit: NOTHING;
4099  } _SEH2_FINALLY {
4100 
4101  DebugUnwind( FatOpenTargetDirectory );
4102 
4103  //
4104  // If this is an abnormal termination then undo our work
4105  //
4106 
4107  if (_SEH2_AbnormalTermination()) {
4108 
4109  if (UnwindCcb != NULL) { FatDeleteCcb( IrpContext, &UnwindCcb ); }
4110  if (UnwindShareAccess) { IoRemoveShareAccess( FileObject, &Dcb->ShareAccess ); }
4111  }
4112 
4113  if (DcbAcquired) {
4114 
4115  FatReleaseFcb( IrpContext, Dcb );
4116  }
4117 
4118  DebugTrace(-1, Dbg, "FatOpenTargetDirectory -> Iosb.Status = %08lx\n", Iosb.Status);
4119  } _SEH2_END;
4120 
4121  return Iosb;
4122 }
4123 
4124 
4125 
4126 //
4127 // Internal support routine
4128 //
4129 _Success_(return.Status == STATUS_SUCCESS)
4130 _Requires_lock_held_(_Global_critical_region_)
4131 IO_STATUS_BLOCK
4132 #ifdef _MSC_VER
4133 #pragma warning(suppress:6101) // bug in PREFast means the _Success_ annotation is not correctly applied
4134 #endif
4135 FatOpenExistingDirectory (
4136  _In_ PIRP_CONTEXT IrpContext,
4137  _In_ PIO_STACK_LOCATION IrpSp,
4138  _Inout_ PFILE_OBJECT FileObject,
4139  _Inout_ PVCB Vcb,
4140  _Outptr_result_maybenull_ PDCB *Dcb,
4141  _In_ PDCB ParentDcb,
4142  _In_ PDIRENT Dirent,
4143  _In_ ULONG LfnByteOffset,
4144  _In_ ULONG DirentByteOffset,
4145  _In_ PUNICODE_STRING Lfn,
4146  _In_ PACCESS_MASK DesiredAccess,
4147  _In_ USHORT ShareAccess,
4148  _In_ ULONG CreateDisposition,
4149  _In_ BOOLEAN NoEaKnowledge,
4150  _In_ BOOLEAN DeleteOnClose,
4151  _In_ BOOLEAN FileNameOpenedDos,
4152  _In_ BOOLEAN OpenRequiringOplock
4153  )
4154 
4155 /*++
4156 
4157 Routine Description:
4158 
4159  This routine opens the specified directory. The directory has not
4160  previously been opened.
4161 
4162 Arguments:
4163 
4164  FileObject - Supplies the File object
4165 
4166  Vcb - Supplies the Vcb denoting the volume containing the dcb
4167 
4168  Dcb - Returns the newly-created DCB for the file.
4169 
4170  ParentDcb - Supplies the parent directory containing the subdirectory
4171  to be opened
4172 
4173  DirectoryName - Supplies the file name of the directory being opened.
4174 
4175  Dirent - Supplies the dirent for the directory being opened
4176 
4177  LfnByteOffset - Tells where the Lfn begins. If there is no Lfn
4178  this field is the same as DirentByteOffset.
4179 
4180  DirentByteOffset - Supplies the Vbo of the dirent within its parent
4181  directory
4182 
4183  Lfn - May supply a long name for the file.
4184 
4185  DesiredAccess - Supplies the desired access of the caller
4186 
4187  ShareAccess - Supplies the share access of the caller
4188 
4189  CreateDisposition - Supplies the create disposition for this operation
4190 
4191  NoEaKnowledge - This opener doesn't understand Ea's and we fail this
4192  open if the file has NeedEa's.
4193 
4194  DeleteOnClose - The caller wants the file gone when the handle is closed
4195 
4196  OpenRequiringOplock - The caller provided the FILE_OPEN_REQUIRING_OPLOCK option.
4197 
4198 Return Value:
4199 
4200  IO_STATUS_BLOCK - Returns the completion status for the operation
4201 
4202 --*/
4203 
4204 {
4205  IO_STATUS_BLOCK Iosb = {0};
4206 
4207  //
4208  // The following variables are for abnormal termination
4209  //
4210 
4211  PDCB UnwindDcb = NULL;
4212  PCCB UnwindCcb = NULL;
4213 
4214  BOOLEAN CountsIncremented = FALSE;
4215 
4216  UNREFERENCED_PARAMETER( DeleteOnClose );
4217 #if (NTDDI_VERSION <= NTDDI_WIN7)
4218  UNREFERENCED_PARAMETER( OpenRequiringOplock );
4219 #endif
4220  UNREFERENCED_PARAMETER( IrpSp );
4221 
4222  PAGED_CODE();
4223 
4224  DebugTrace(+1, Dbg, "FatOpenExistingDirectory...\n", 0);
4225 
4226  _SEH2_TRY {
4227 
4228  //
4229  // If the caller has no Ea knowledge, we immediately check for
4230  // Need Ea's on the file.
4231  //
4232 
4233  if (NoEaKnowledge && !FatIsFat32(Vcb)) {
4234 
4235  ULONG NeedEaCount;
4236 
4237  FatGetNeedEaCount( IrpContext,
4238  Vcb,
4239  Dirent,
4240  &NeedEaCount );
4241 
4242  if (NeedEaCount != 0) {
4243 
4244  Iosb.Status = STATUS_ACCESS_DENIED;
4245  try_return( Iosb );
4246  }
4247  }
4248 
4249  //
4250  // Check the create disposition and desired access
4251  //
4252 
4253  if ((CreateDisposition != FILE_OPEN) &&
4254  (CreateDisposition != FILE_OPEN_IF)) {
4255 
4256  Iosb.Status = STATUS_OBJECT_NAME_COLLISION;
4257  try_return( Iosb );
4258  }
4259 
4260  if (!FatCheckFileAccess( IrpContext,
4261  Dirent->Attributes,
4262  DesiredAccess)) {
4263 
4264  Iosb.Status = STATUS_ACCESS_DENIED;
4265  try_return( Iosb );
4266  }
4267 
4268  //
4269  // Create a new dcb for the directory
4270  //
4271 
4272  *Dcb = UnwindDcb = FatCreateDcb( IrpContext,
4273  Vcb,
4274  ParentDcb,
4275  LfnByteOffset,
4276  DirentByteOffset,
4277  Dirent,
4278  Lfn );
4279 
4280 #if (NTDDI_VERSION >= NTDDI_WIN8)
4281 
4282  //
4283  // Let's make sure that if the caller provided an oplock key that it
4284  // gets stored in the file object.
4285  //
4286 
4287  Iosb.Status = FsRtlCheckOplockEx( FatGetFcbOplock(*Dcb),
4288  IrpContext->OriginatingIrp,
4289  OPLOCK_FLAG_OPLOCK_KEY_CHECK_ONLY,
4290  NULL,
4291  NULL,
4292  NULL );
4293 
4294  //
4295  // If the caller wants atomic create-with-oplock semantics, tell
4296  // the oplock package. We haven't incremented the Fcb's UncleanCount
4297  // for this create yet, so add that in on the call.
4298  //
4299 
4300  if (OpenRequiringOplock &&
4301  (Iosb.Status == STATUS_SUCCESS)) {
4302 
4303  Iosb.Status = FsRtlOplockFsctrl( FatGetFcbOplock(*Dcb),
4304  IrpContext->OriginatingIrp,
4305  ((*Dcb)->UncleanCount + 1) );
4306  }
4307 
4308  //
4309  // Get out if either of the above calls failed. Raise to trigger
4310  // cleanup of the new Dcb.
4311  //
4312 
4313  if (Iosb.Status != STATUS_SUCCESS) {
4314 
4315  NT_ASSERT( Iosb.Status != STATUS_PENDING );
4316 
4317  FatRaiseStatus( IrpContext, Iosb.Status );
4318  }
4319 #endif
4320 
4321  //
4322  // Setup our share access
4323  //
4324 
4325  IoSetShareAccess( *DesiredAccess,
4326  ShareAccess,
4327  FileObject,
4328  &(*Dcb)->ShareAccess );
4329 
4330  //
4331  // Setup the context and section object pointers, and update
4332  // our reference counts
4333  //
4334 
4335  FatSetFileObject( FileObject,
4336  UserDirectoryOpen,
4337  (*Dcb),
4338  UnwindCcb = FatCreateCcb( IrpContext ));
4339 
4340  (*Dcb)->UncleanCount += 1;
4341  (*Dcb)->OpenCount += 1;
4342  Vcb->OpenFileCount += 1;
4343  if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount += 1; }
4344 
4345  CountsIncremented = TRUE;
4346 
4347 
4348  //
4349  // And set our status to success
4350  //
4351 
4352  Iosb.Status = STATUS_SUCCESS;
4353  Iosb.Information = FILE_OPENED;
4354 
4355  if ( NT_SUCCESS(Iosb.Status) ) {
4356  PCCB Ccb;
4357 
4358  Ccb = (PCCB)FileObject->FsContext2;
4359 
4360  //
4361  // Mark the OpenedByShortName bit if the operation was successful.
4362  //
4363 
4364  if ( FileNameOpenedDos ) {
4365 
4366  SetFlag( Ccb->Flags, CCB_FLAG_OPENED_BY_SHORTNAME );
4367  }
4368  }
4369 
4370  try_exit: NOTHING;
4371  } _SEH2_FINALLY {
4372 
4373  DebugUnwind( FatOpenExistingDirectory );
4374 
4375  //
4376  // If this is an abnormal termination then undo our work
4377  //
4378 
4379  if (_SEH2_AbnormalTermination()) {
4380 
4381  if (CountsIncremented) {
4382 
4383  (*Dcb)->UncleanCount -= 1;
4384  (*Dcb)->OpenCount -= 1;
4385  Vcb->OpenFileCount -= 1;
4386  if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount -= 1; }
4387  }
4388 
4389  if (UnwindDcb != NULL) {
4390  if (ARGUMENT_PRESENT( FileObject )) {
4391  FileObject->SectionObjectPointer = NULL;
4392  }
4393  FatDeleteFcb( IrpContext, &UnwindDcb );
4394  *Dcb = NULL;
4395  }
4396  if (UnwindCcb != NULL) { FatDeleteCcb( IrpContext, &UnwindCcb ); }
4397  }
4398 
4399  DebugTrace(-1, Dbg, "FatOpenExistingDirectory -> Iosb.Status = %08lx\n", Iosb.Status);
4400  } _SEH2_END;
4401 
4402  return Iosb;
4403 }
4404 
4405 
4406 //
4407 // Internal support routine
4408 //
4409 
4410 _Requires_lock_held_(_Global_critical_region_)
4411 IO_STATUS_BLOCK
4412 FatOpenExistingFile (
4413  _In_ PIRP_CONTEXT IrpContext,
4414  _Inout_ PFILE_OBJECT FileObject,
4415  _Inout_ PVCB Vcb,
4416  _Outptr_result_maybenull_ PFCB *Fcb,
4417  _In_ PDCB ParentDcb,
4418  _In_ PDIRENT Dirent,
4419  _In_ ULONG LfnByteOffset,
4420  _In_ ULONG DirentByteOffset,
4421  _In_ PUNICODE_STRING Lfn,
4422  _In_ PUNICODE_STRING OrigLfn,
4423  _In_ PACCESS_MASK DesiredAccess,
4424  _In_ USHORT ShareAccess,
4425  _In_ ULONG AllocationSize,
4426  _In_ PFILE_FULL_EA_INFORMATION EaBuffer,
4427  _In_ ULONG EaLength,
4428  _In_ USHORT FileAttributes,
4429  _In_ ULONG CreateDisposition,
4430  _In_ BOOLEAN IsPagingFile,
4431  _In_ BOOLEAN NoEaKnowledge,
4432  _In_ BOOLEAN DeleteOnClose,
4433  _In_ BOOLEAN OpenRequiringOplock,
4434  _In_ BOOLEAN FileNameOpenedDos
4435  )
4436 
4437 /*++
4438 
4439 Routine Description:
4440 
4441  This routine opens the specified file. The file has not previously
4442  been opened.
4443 
4444 Arguments:
4445 
4446  FileObject - Supplies the File object
4447 
4448  Vcb - Supplies the Vcb denoting the volume containing the file
4449 
4450  Fcb - Returns the newly-created FCB for the file.
4451 
4452  ParentDcb - Supplies the parent directory containing the file to be
4453  opened
4454 
4455  Dirent - Supplies the dirent for the file being opened
4456 
4457  LfnByteOffset - Tells where the Lfn begins. If there is no Lfn
4458  this field is the same as DirentByteOffset.
4459 
4460  DirentByteOffset - Supplies the Vbo of the dirent within its parent
4461  directory
4462 
4463  Lfn - May supply a long name for the file.
4464 
4465  DesiredAccess - Supplies the desired access of the caller
4466 
4467  ShareAccess - Supplies the share access of the caller
4468 
4469  AllocationSize - Supplies the initial allocation if the file is being
4470  superseded, overwritten, or created.
4471 
4472  EaBuffer - Supplies the Ea set if the file is being superseded,
4473  overwritten, or created.
4474 
4475  EaLength - Supplies the size, in byte, of the EaBuffer
4476 
4477  FileAttributes - Supplies file attributes to use if the file is being
4478  superseded, overwritten, or created
4479 
4480  CreateDisposition - Supplies the create disposition for this operation
4481 
4482  IsPagingFile - Indicates if this is the paging file being opened.
4483 
4484  NoEaKnowledge - This opener doesn't understand Ea's and we fail this
4485  open if the file has NeedEa's.
4486 
4487  DeleteOnClose - The caller wants the file gone when the handle is closed
4488 
4489  OpenRequiringOplock - The caller provided the FILE_OPEN_REQUIRING_OPLOCK option.
4490 
4491  FileNameOpenedDos - The caller opened this file by hitting the 8.3 side
4492  of the Lfn/8.3 pair
4493 
4494 Return Value:
4495 
4496  IO_STATUS_BLOCK - Returns the completion status for the operation
4497 
4498 --*/
4499 
4500 {
4501  IO_STATUS_BLOCK Iosb = {0};
4502 
4503  ACCESS_MASK AddedAccess = 0;
4504 
4505  PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation( IrpContext->OriginatingIrp );
4506 
4507  //
4508  // The following variables are for abnormal termination
4509  //
4510 
4511  PFCB UnwindFcb = NULL;
4512  PCCB UnwindCcb = NULL;
4513  BOOLEAN CountsIncremented = FALSE;
4514 
4515 
4516 #if (NTDDI_VERSION < NTDDI_WIN7)
4517  UNREFERENCED_PARAMETER( OpenRequiringOplock );
4518 #endif
4519 
4520  PAGED_CODE();
4521 
4522  DebugTrace(+1, Dbg, "FatOpenExistingFile...\n", 0);
4523 
4524  _SEH2_TRY {
4525 
4526  //
4527  // Check if the user wanted to create the file or if access is
4528  // denied
4529  //
4530 
4531  if (CreateDisposition == FILE_CREATE) {
4532  Iosb.Status = STATUS_OBJECT_NAME_COLLISION;
4533  try_return( Iosb );
4534 
4535  } else if ((CreateDisposition == FILE_SUPERSEDE) && !IsPagingFile) {
4536 
4537  SetFlag( AddedAccess,
4538  DELETE & ~(*DesiredAccess) );
4539 
4540  *DesiredAccess |= DELETE;
4541 
4542  } else if (((CreateDisposition == FILE_OVERWRITE) ||
4543  (CreateDisposition == FILE_OVERWRITE_IF)) && !IsPagingFile) {
4544 
4545  SetFlag( AddedAccess,
4546  (FILE_WRITE_DATA | FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES) & ~(*DesiredAccess) );
4547 
4548  *DesiredAccess |= FILE_WRITE_DATA | FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES;
4549  }
4550 
4551  if (!FatCheckFileAccess( IrpContext,
4552  Dirent->Attributes,
4553  DesiredAccess)) {
4554 
4555  Iosb.Status = STATUS_ACCESS_DENIED;
4556  try_return( Iosb );
4557  }
4558 
4559 
4560  //
4561  // Check for trying to delete a read only file.
4562  //
4563 
4564  if (DeleteOnClose &&
4565  FlagOn( Dirent->Attributes, FAT_DIRENT_ATTR_READ_ONLY )) {
4566 
4567  Iosb.Status = STATUS_CANNOT_DELETE;
4568  try_return( Iosb );
4569  }
4570 
4571  //
4572  // IF we are asked to do an overwrite or supersede operation then
4573  // deny access for files where the file attributes for system and
4574  // hidden do not match
4575  //
4576 
4577  if ((CreateDisposition == FILE_SUPERSEDE) ||
4578  (CreateDisposition == FILE_OVERWRITE) ||
4579  (CreateDisposition == FILE_OVERWRITE_IF)) {
4580 
4581  BOOLEAN Hidden;
4582  BOOLEAN System;
4583 
4584  Hidden = BooleanFlagOn(Dirent->Attributes, FAT_DIRENT_ATTR_HIDDEN );
4585  System = BooleanFlagOn(Dirent->Attributes, FAT_DIRENT_ATTR_SYSTEM );
4586 
4587  if ((Hidden && !FlagOn(FileAttributes, FILE_ATTRIBUTE_HIDDEN)) ||
4588  (System && !FlagOn(FileAttributes, FILE_ATTRIBUTE_SYSTEM))) {
4589 
4590  DebugTrace(0, Dbg, "The hidden and/or system bits do not match\n", 0);
4591 
4592  if ( !IsPagingFile ) {
4593 
4594  Iosb.Status = STATUS_ACCESS_DENIED;
4595  try_return( Iosb );
4596  }
4597  }
4598 
4599  //
4600  // If this media is write protected, don't even try the create.
4601  //
4602 
4603  if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_WRITE_PROTECTED)) {
4604 
4605  //
4606  // Set the real device for the pop-up info, and set the verify
4607  // bit in the device object, so that we will force a verify
4608  // in case the user put the correct media back in.
4609  //
4610 
4611 
4612  IoSetHardErrorOrVerifyDevice( IrpContext->OriginatingIrp,
4613  Vcb->Vpb->RealDevice );
4614 
4615  SetFlag(Vcb->Vpb->RealDevice->Flags, DO_VERIFY_VOLUME);
4616 
4617  FatRaiseStatus( IrpContext, STATUS_MEDIA_WRITE_PROTECTED );
4618  }
4619  }
4620 
4621  //
4622  // Create a new Fcb for the file, and set the file size in
4623  // the fcb.
4624  //
4625 
4626  *Fcb = UnwindFcb = FatCreateFcb( IrpContext,
4627  Vcb,
4628  ParentDcb,
4629  LfnByteOffset,
4630  DirentByteOffset,
4631  Dirent,
4632  Lfn,
4633  OrigLfn,
4634  IsPagingFile,
4635  FALSE );
4636 
4637 
4638  (*Fcb)->Header.ValidDataLength.LowPart = (*Fcb)->Header.FileSize.LowPart;
4639 
4640  //
4641  // If this is a paging file, lookup the allocation size so that
4642  // the Mcb is always valid
4643  //
4644 
4645  if (IsPagingFile) {
4646 
4647  FatLookupFileAllocationSize( IrpContext, *Fcb );
4648  }
4649 
4650 #if (NTDDI_VERSION >= NTDDI_WIN7)
4651 
4652  //
4653  // Let's make sure that if the caller provided an oplock key that it
4654  // gets stored in the file object.
4655  //
4656 
4657  Iosb.Status = FsRtlCheckOplockEx( FatGetFcbOplock(*Fcb),
4658  IrpContext->OriginatingIrp,
4659  OPLOCK_FLAG_OPLOCK_KEY_CHECK_ONLY,
4660  NULL,
4661  NULL,
4662  NULL );
4663 
4664  //
4665  // If the caller wants atomic create-with-oplock semantics, tell
4666  // the oplock package. We haven't incremented the Fcb's UncleanCount
4667  // for this create yet, so add that in on the call.
4668  //
4669 
4670  if (OpenRequiringOplock &&
4671  (Iosb.Status == STATUS_SUCCESS)) {
4672 
4673  Iosb.Status = FsRtlOplockFsctrl( FatGetFcbOplock(*Fcb),
4674  IrpContext->OriginatingIrp,
4675  ((*Fcb)->UncleanCount + 1) );
4676  }
4677 
4678  //
4679  // Get out if either of the above calls failed. Raise to trigger
4680  // cleanup of the new Fcb.
4681  //
4682 
4683  if (Iosb.Status != STATUS_SUCCESS) {
4684 
4685  NT_ASSERT( Iosb.Status != STATUS_PENDING );
4686 
4687  FatRaiseStatus( IrpContext, Iosb.Status );
4688  }
4689 #endif
4690 
4691  //
4692  // Now case on whether we are to simply open, supersede, or
4693  // overwrite the file.
4694  //
4695 
4696  switch (CreateDisposition) {
4697 
4698  case FILE_OPEN:
4699  case FILE_OPEN_IF:
4700 
4701  DebugTrace(0, Dbg, "Doing only an open operation\n", 0);
4702 
4703  //
4704  // If the caller has no Ea knowledge, we immediately check for
4705  // Need Ea's on the file.
4706  //
4707 
4708  if (NoEaKnowledge && !FatIsFat32(Vcb)) {
4709 
4710  ULONG NeedEaCount;
4711 
4712  FatGetNeedEaCount( IrpContext,
4713  Vcb,
4714  Dirent,
4715  &NeedEaCount );
4716 
4717  if (NeedEaCount != 0) {
4718 
4719  FatRaiseStatus( IrpContext, STATUS_ACCESS_DENIED );
4720  }
4721  }
4722 
4723  //
4724  // Setup the context and section object pointers.
4725  //
4726 
4727  FatSetFileObject( FileObject,
4728  UserFileOpen,
4729  *Fcb,
4730  UnwindCcb = FatCreateCcb( IrpContext ));
4731 
4732  FileObject->SectionObjectPointer = &(*Fcb)->NonPaged->SectionObjectPointers;
4733 
4734  Iosb.Status = STATUS_SUCCESS;
4735  Iosb.Information = FILE_OPENED;
4736  break;
4737 
4738  case FILE_SUPERSEDE:
4739  case FILE_OVERWRITE:
4740  case FILE_OVERWRITE_IF:
4741 
4742  DebugTrace(0, Dbg, "Doing supersede/overwrite operation\n", 0);
4743 
4744  //
4745  // Determine the granted access for this operation now.
4746  //
4747 
4748  if (!NT_SUCCESS( Iosb.Status = FatCheckSystemSecurityAccess( IrpContext ))) {
4749 
4750  try_return( Iosb );
4751  }
4752 
4753  Iosb = FatSupersedeOrOverwriteFile( IrpContext,
4754  FileObject,
4755  *Fcb,
4756  AllocationSize,
4757  EaBuffer,
4758  EaLength,
4759  FileAttributes,
4760  CreateDisposition,
4761  NoEaKnowledge );
4762  break;
4763 
4764  default:
4765 
4766  DebugTrace(0, Dbg, "Illegal Create Disposition\n", 0);
4767 
4768 #ifdef _MSC_VER
4769 #pragma prefast( suppress:28159, "things are seriously wrong if we get here" )
4770 #endif
4771  FatBugCheck( CreateDisposition, 0, 0 );
4772  break;
4773  }
4774 
4775  try_exit: NOTHING;
4776 
4777  //
4778  // Setup our share access and counts if things were successful.
4779  //
4780 
4781  if ((Iosb.Status != STATUS_PENDING) && NT_SUCCESS( Iosb.Status )) {
4782 
4783  //
4784  // Remove any virtual access the caller needed to check against, but will
4785  // not really receive. Overwrite/supersede is a bit of a special case.
4786  //
4787 
4788  ClearFlag( *DesiredAccess, AddedAccess );
4789 
4790  IoSetShareAccess( *DesiredAccess,
4791  ShareAccess,
4792  FileObject,
4793  &(*Fcb)->ShareAccess );
4794 
4795  (*Fcb)->UncleanCount += 1;
4796  (*Fcb)->OpenCount += 1;
4797  if (FlagOn(FileObject->Flags, FO_NO_INTERMEDIATE_BUFFERING)) {
4798  (*Fcb)->NonCachedUncleanCount += 1;
4799  }
4800  Vcb->OpenFileCount += 1;
4801  if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount += 1; }
4802 
4803  CountsIncremented = TRUE;
4804  }
4805 
4806  {
4807  PCCB Ccb;
4808 
4809  Ccb = (PCCB)FileObject->FsContext2;
4810 
4811  if ( NT_SUCCESS(Iosb.Status) ) {
4812 
4813  //
4814  // Mark the DeleteOnClose bit if the operation was successful.
4815  //
4816 
4817  if ( DeleteOnClose ) {
4818 
4819  SetFlag( Ccb->Flags, CCB_FLAG_DELETE_ON_CLOSE );
4820  }
4821 
4822  //
4823  // Mark the OpenedByShortName bit if the operation was successful.
4824  //
4825 
4826  if ( FileNameOpenedDos ) {
4827 
4828  SetFlag( Ccb->Flags, CCB_FLAG_OPENED_BY_SHORTNAME );
4829  }
4830 
4831  //
4832  // Mark the ManageVolumeAccess bit if the privilege is held.
4833  //
4834 
4835  if (FatCheckManageVolumeAccess( IrpContext,
4836  IrpSp->Parameters.Create.SecurityContext->AccessState,
4837  (KPROCESSOR_MODE)( FlagOn( IrpSp->Flags, SL_FORCE_ACCESS_CHECK ) ?
4838  UserMode :
4839  IrpContext->OriginatingIrp->RequestorMode ))) {
4840 
4841  SetFlag( Ccb->Flags, CCB_FLAG_MANAGE_VOLUME_ACCESS );
4842  }
4843 
4844  }
4845  }
4846 
4847 
4848  } _SEH2_FINALLY {
4849 
4850  DebugUnwind( FatOpenExistingFile );
4851 
4852  //
4853  // If this is an abnormal termination then undo our work
4854  //
4855 
4856  if (_SEH2_AbnormalTermination()) {
4857 
4858  if (CountsIncremented) {
4859  (*Fcb)->UncleanCount -= 1;
4860  (*Fcb)->OpenCount -= 1;
4861  if (FlagOn(FileObject->Flags, FO_NO_INTERMEDIATE_BUFFERING)) {
4862  (*Fcb)->NonCachedUncleanCount -= 1;
4863  }
4864  Vcb->OpenFileCount -= 1;
4865  if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount -= 1; }
4866  }
4867 
4868  if (UnwindFcb != NULL) {
4869  if (ARGUMENT_PRESENT( FileObject )) {
4870  FileObject->SectionObjectPointer = NULL;
4871  }
4872  FatDeleteFcb( IrpContext, &UnwindFcb );
4873  *Fcb = NULL;
4874  }
4875 
4876  if (UnwindCcb != NULL) { FatDeleteCcb( IrpContext, &UnwindCcb ); }
4877  }
4878 
4879  DebugTrace(-1, Dbg, "FatOpenExistingFile -> Iosb.Status = %08lx\n", Iosb.Status);
4880  } _SEH2_END;
4881 
4882  return Iosb;
4883 }
4884 
4885 
4886 //
4887 // Internal support routine
4888 //
4889 
4890 _Requires_lock_held_(_Global_critical_region_)
4891 IO_STATUS_BLOCK
4892 FatCreateNewDirectory (
4893  _In_ PIRP_CONTEXT IrpContext,
4894  _In_ PIO_STACK_LOCATION IrpSp,
4895  _Inout_ PFILE_OBJECT FileObject,
4896  _Inout_ PVCB Vcb,
4897  _Inout_ PDCB ParentDcb,
4898  _In_ POEM_STRING OemName,
4899  _In_ PUNICODE_STRING UnicodeName,
4900  _In_ PACCESS_MASK DesiredAccess,
4901  _In_ USHORT ShareAccess,
4902  _In_ PFILE_FULL_EA_INFORMATION EaBuffer,
4903  _In_ ULONG EaLength,
4904  _In_ USHORT FileAttributes,
4905  _In_ BOOLEAN NoEaKnowledge,
4906  _In_ BOOLEAN DeleteOnClose,
4907  _In_ BOOLEAN OpenRequiringOplock
4908  )
4909 
4910 /*++
4911 
4912 Routine Description:
4913 
4914  This routine creates a new directory. The directory has already been
4915  verified not to exist yet.
4916 
4917 Arguments:
4918 
4919  FileObject - Supplies the file object for the newly created directory
4920 
4921  Vcb - Supplies the Vcb denote the volume to contain the new directory
4922 
4923  ParentDcb - Supplies the parent directory containg the newly created
4924  directory
4925 
4926  OemName - Supplies the Oem name for the newly created directory. It may
4927  or maynot be 8.3 complient, but will be upcased.
4928 
4929  UnicodeName - Supplies the Unicode name for the newly created directory.
4930  It may or maynot be 8.3 complient. This name contains the original
4931  case information.
4932 
4933  DesiredAccess - Supplies the desired access of the caller
4934 
4935  ShareAccess - Supplies the shared access of the caller
4936 
4937  EaBuffer - Supplies the Ea set for the newly created directory
4938 
4939  EaLength - Supplies the length, in bytes, of EaBuffer
4940 
4941  FileAttributes - Supplies the file attributes for the newly created
4942  directory.
4943 
4944  NoEaKnowledge - This opener doesn't understand Ea's and we fail this
4945  open if the file has NeedEa's.
4946 
4947  DeleteOnClose - The caller wants the file gone when the handle is closed
4948 
4949  OpenRequiringOplock - The caller provided the FILE_OPEN_REQUIRING_OPLOCK option.
4950 
4951 Return Value:
4952 
4953  IO_STATUS_BLOCK - Returns the completion status for the operation
4954 
4955 --*/
4956 
4957 {
4958  IO_STATUS_BLOCK Iosb;
4959 
4960  PDCB Dcb = NULL;
4961  PCCB Ccb = NULL;
4962 
4963  PDIRENT Dirent = NULL;
4964  PBCB DirentBcb = NULL;
4965  ULONG DirentsNeeded;
4966  ULONG DirentByteOffset;
4967 
4968  PDIRENT ShortDirent;
4969  ULONG ShortDirentByteOffset;
4970 
4971  USHORT EaHandle;
4972 
4973  BOOLEAN AllLowerComponent;
4974  BOOLEAN AllLowerExtension;
4975  BOOLEAN CreateLfn;
4976 
4977  ULONG BytesInFirstPage = 0;
4978  ULONG DirentsInFirstPage = 0;
4979  PDIRENT FirstPageDirent = 0;
4980 
4981  PBCB SecondPageBcb = NULL;
4982  ULONG SecondPageOffset;
4983  PDIRENT SecondPageDirent = NULL;
4984 
4985  BOOLEAN DirentFromPool = FALSE;
4986 
4987 
4988  OEM_STRING ShortName;
4989  UCHAR ShortNameBuffer[12];
4990 
4991 #if (NTDDI_VERSION <= NTDDI_WIN7)
4992  UNREFERENCED_PARAMETER( OpenRequiringOplock );
4993 #endif
4994 
4995  UNREFERENCED_PARAMETER( IrpSp );
4996 
4997  PAGED_CODE();
4998 
4999  DebugTrace(+1, Dbg, "FatCreateNewDirectory...\n", 0);
5000 
5001  ShortName.Length = 0;
5002  ShortName.MaximumLength = 12;
5003  ShortName.Buffer = (PCHAR)&ShortNameBuffer[0];
5004 
5005  EaHandle = 0;
5006 
5007  //
5008  // We fail this operation if the caller doesn't understand Ea's.
5009  //
5010 
5011  if (NoEaKnowledge
5012  && EaLength > 0) {
5013 
5014  Iosb.Status = STATUS_ACCESS_DENIED;
5015 
5016  DebugTrace(-1, Dbg, "FatCreateNewDirectory -> Iosb.Status = %08lx\n", Iosb.Status);
5017  return Iosb;
5018  }
5019 
5020  //
5021  // DeleteOnClose and ReadOnly are not compatible.
5022  //
5023 
5024  if (DeleteOnClose && FlagOn(FileAttributes, FAT_DIRENT_ATTR_READ_ONLY)) {
5025 
5026  Iosb.Status = STATUS_CANNOT_DELETE;
5027  return Iosb;
5028  }
5029 
5030  // Now get the names that we will be using.
5031  //
5032 
5033  FatSelectNames( IrpContext,
5034  ParentDcb,
5035  OemName,
5036  UnicodeName,
5037  &ShortName,
5038  NULL,
5039  &AllLowerComponent,
5040  &AllLowerExtension,
5041  &CreateLfn );
5042 
5043  //
5044  // If we are not in Chicago mode, ignore the magic bits.
5045  //
5046 
5047  if (!FatData.ChicagoMode) {
5048 
5049  AllLowerComponent = FALSE;
5050  AllLowerExtension = FALSE;
5051  CreateLfn = FALSE;
5052  }
5053 
5054  //
5055  // Create/allocate a new dirent
5056  //
5057 
5058  DirentsNeeded = CreateLfn ? FAT_LFN_DIRENTS_NEEDED(UnicodeName) + 1 : 1;
5059 
5060  DirentByteOffset = FatCreateNewDirent( IrpContext,
5061  ParentDcb,
5062  DirentsNeeded,
5063  FALSE );
5064  _SEH2_TRY {
5065 
5066  FatPrepareWriteDirectoryFile( IrpContext,
5067  ParentDcb,
5068  DirentByteOffset,
5069  sizeof(DIRENT),
5070  &DirentBcb,
5071 #ifndef __REACTOS__
5072  &Dirent,
5073 #else
5074  (PVOID *)&Dirent,
5075 #endif
5076  FALSE,
5077  TRUE,
5078  &Iosb.Status );
5079 
5080  NT_ASSERT( NT_SUCCESS( Iosb.Status ) && DirentBcb && Dirent );
5081 
5082  //
5083  // Deal with the special case of an LFN + Dirent structure crossing
5084  // a page boundry.
5085  //
5086 
5087  if ((DirentByteOffset / PAGE_SIZE) !=
5088  ((DirentByteOffset + (DirentsNeeded - 1) * sizeof(DIRENT)) / PAGE_SIZE)) {
5089 
5090  SecondPageBcb;
5091  SecondPageOffset;
5092  SecondPageDirent;
5093 
5094  SecondPageOffset = (DirentByteOffset & ~(PAGE_SIZE - 1)) + PAGE_SIZE;
5095 
5096  BytesInFirstPage = SecondPageOffset - DirentByteOffset;
5097 
5098  DirentsInFirstPage = BytesInFirstPage / sizeof(DIRENT);
5099 
5100  FatPrepareWriteDirectoryFile( IrpContext,
5101  ParentDcb,
5102  SecondPageOffset,
5103  sizeof(DIRENT),
5104  &SecondPageBcb,
5105 #ifndef __REACTOS__
5106  &SecondPageDirent,
5107 #else
5108  (PVOID *)&SecondPageDirent,
5109 #endif
5110  FALSE,
5111  TRUE,
5112  &Iosb.Status );
5113 
5114  NT_ASSERT( NT_SUCCESS( Iosb.Status ) && SecondPageBcb && SecondPageDirent );
5115 
5116  FirstPageDirent = Dirent;
5117 
5118  Dirent = FsRtlAllocatePoolWithTag( PagedPool,
5119  DirentsNeeded * sizeof(DIRENT),
5120  TAG_DIRENT );
5121 
5122  DirentFromPool = TRUE;
5123  }
5124 
5125  //
5126  // Bump up Dirent and DirentByteOffset
5127  //
5128 
5129  ShortDirent = Dirent + DirentsNeeded - 1;
5130  ShortDirentByteOffset = DirentByteOffset +
5131  (DirentsNeeded - 1) * sizeof(DIRENT);
5132 
5133  NT_ASSERT( NT_SUCCESS( Iosb.Status ));
5134 
5135 
5136  //
5137  // Fill in the fields of the dirent.
5138  //
5139 
5140  FatConstructDirent( IrpContext,
5141  ShortDirent,
5142  &ShortName,
5143  AllLowerComponent,
5144  AllLowerExtension,
5145  CreateLfn ? UnicodeName : NULL,
5146  FileAttributes | FAT_DIRENT_ATTR_DIRECTORY,
5147  TRUE,
5148  NULL );
5149 
5150  //
5151  // If the dirent crossed pages, we have to do some real gross stuff.
5152  //
5153 
5154  if (DirentFromPool) {
5155 
5156  RtlCopyMemory( FirstPageDirent, Dirent, BytesInFirstPage );
5157 
5158  RtlCopyMemory( SecondPageDirent,
5159  Dirent + DirentsInFirstPage,
5160  DirentsNeeded*sizeof(DIRENT) - BytesInFirstPage );
5161 
5162  ShortDirent = SecondPageDirent + (DirentsNeeded - DirentsInFirstPage) - 1;
5163  }
5164 
5165  //
5166  // Create a new dcb for the directory.
5167  //
5168 
5169  Dcb = FatCreateDcb( IrpContext,
5170  Vcb,
5171  ParentDcb,
5172  DirentByteOffset,
5173  ShortDirentByteOffset,
5174  ShortDirent,
5175  CreateLfn ? UnicodeName : NULL );
5176 
5177 #if (NTDDI_VERSION >= NTDDI_WIN8)
5178  //
5179  // The next three FsRtl calls are for oplock work. We deliberately
5180  // do these here so that if either call fails we will be able to
5181  // clean up without adding a bunch of code to unwind counts, fix
5182  // the file object, etc.
5183  //
5184 
5185  //
5186  // Let's make sure that if the caller provided an oplock key that it
5187  // gets stored in the file object.
5188  //
5189 
5190  Iosb.Status = FsRtlCheckOplockEx( FatGetFcbOplock(Dcb),
5191  IrpContext->OriginatingIrp,
5192  OPLOCK_FLAG_OPLOCK_KEY_CHECK_ONLY,
5193  NULL,
5194  NULL,
5195  NULL );
5196 
5197  //
5198  // If the caller wants atomic create-with-oplock semantics, tell
5199  // the oplock package. We haven't incremented the Dcb's UncleanCount
5200  // for this create yet, so add that in on the call.
5201  //
5202 
5203  if (OpenRequiringOplock &&
5204  (Iosb.Status == STATUS_SUCCESS)) {
5205 
5206  Iosb.Status = FsRtlOplockFsctrl( FatGetFcbOplock(Dcb),
5207  IrpContext->OriginatingIrp,
5208  (Dcb->UncleanCount + 1) );
5209  }
5210 
5211  //
5212  // Break parent directory oplock. Directory oplock breaks are always
5213  // advisory, so we will never block/get STATUS_PENDING here. On the
5214  // off chance this fails with INSUFFICIENT_RESOURCES we do it here
5215  // where we can still tolerate a failure.
5216  //
5217 
5218  if (Iosb.Status ==