ReactOS  0.4.14-dev-833-g5f692ed
fastio.c
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1 /*
2  * FILE: drivers/filesystems/fastfat/fastio.c
3  * PURPOSE: Fast IO routines.
4  * COPYRIGHT: See COPYING in the top level directory
5  * PROJECT: ReactOS kernel
6  * PROGRAMMER: Herve Poussineau (hpoussin@reactos.org)
7  * Pierre Schweitzer (pierre@reactos.org)
8  */
9 
10 #include "vfat.h"
11 
12 #define NDEBUG
13 #include <debug.h>
14 
15 #if defined(ALLOC_PRAGMA)
16 #pragma alloc_text(INIT, VfatInitFastIoRoutines)
17 #endif
18 
19 static FAST_IO_CHECK_IF_POSSIBLE VfatFastIoCheckIfPossible;
20 
21 static
22 BOOLEAN
23 NTAPI
24 VfatFastIoCheckIfPossible(
25  IN PFILE_OBJECT FileObject,
26  IN PLARGE_INTEGER FileOffset,
27  IN ULONG Length,
28  IN BOOLEAN Wait,
29  IN ULONG LockKey,
30  IN BOOLEAN CheckForReadOperation,
31  OUT PIO_STATUS_BLOCK IoStatus,
32  IN PDEVICE_OBJECT DeviceObject)
33 {
34  /* Prevent all Fast I/O requests */
35  DPRINT("VfatFastIoCheckIfPossible(): returning FALSE.\n");
36 
37  UNREFERENCED_PARAMETER(FileObject);
38  UNREFERENCED_PARAMETER(FileOffset);
39  UNREFERENCED_PARAMETER(Length);
40  UNREFERENCED_PARAMETER(Wait);
41  UNREFERENCED_PARAMETER(LockKey);
42  UNREFERENCED_PARAMETER(CheckForReadOperation);
43  UNREFERENCED_PARAMETER(IoStatus);
44  UNREFERENCED_PARAMETER(DeviceObject);
45 
46  return FALSE;
47 }
48 
49 static FAST_IO_READ VfatFastIoRead;
50 
51 static
52 BOOLEAN
53 NTAPI
54 VfatFastIoRead(
55  IN PFILE_OBJECT FileObject,
56  IN PLARGE_INTEGER FileOffset,
57  IN ULONG Length,
58  IN BOOLEAN Wait,
59  IN ULONG LockKey,
60  OUT PVOID Buffer,
61  OUT PIO_STATUS_BLOCK IoStatus,
62  IN PDEVICE_OBJECT DeviceObject)
63 {
64  DPRINT("VfatFastIoRead()\n");
65 
66  UNREFERENCED_PARAMETER(FileObject);
67  UNREFERENCED_PARAMETER(FileOffset);
68  UNREFERENCED_PARAMETER(Length);
69  UNREFERENCED_PARAMETER(Wait);
70  UNREFERENCED_PARAMETER(LockKey);
71  UNREFERENCED_PARAMETER(Buffer);
72  UNREFERENCED_PARAMETER(IoStatus);
73  UNREFERENCED_PARAMETER(DeviceObject);
74 
75  return FALSE;
76 }
77 
78 static FAST_IO_WRITE VfatFastIoWrite;
79 
80 static
81 BOOLEAN
82 NTAPI
83 VfatFastIoWrite(
84  IN PFILE_OBJECT FileObject,
85  IN PLARGE_INTEGER FileOffset,
86  IN ULONG Length,
87  IN BOOLEAN Wait,
88  IN ULONG LockKey,
89  OUT PVOID Buffer,
90  OUT PIO_STATUS_BLOCK IoStatus,
91  IN PDEVICE_OBJECT DeviceObject)
92 {
93  DPRINT("VfatFastIoWrite()\n");
94 
95  UNREFERENCED_PARAMETER(FileObject);
96  UNREFERENCED_PARAMETER(FileOffset);
97  UNREFERENCED_PARAMETER(Length);
98  UNREFERENCED_PARAMETER(Wait);
99  UNREFERENCED_PARAMETER(LockKey);
100  UNREFERENCED_PARAMETER(Buffer);
101  UNREFERENCED_PARAMETER(IoStatus);
102  UNREFERENCED_PARAMETER(DeviceObject);
103 
104  return FALSE;
105 }
106 
107 static FAST_IO_QUERY_BASIC_INFO VfatFastIoQueryBasicInfo;
108 
109 static
110 BOOLEAN
111 NTAPI
112 VfatFastIoQueryBasicInfo(
113  IN PFILE_OBJECT FileObject,
114  IN BOOLEAN Wait,
115  OUT PFILE_BASIC_INFORMATION Buffer,
116  OUT PIO_STATUS_BLOCK IoStatus,
117  IN PDEVICE_OBJECT DeviceObject)
118 {
119  NTSTATUS Status;
120  PVFATFCB FCB = NULL;
121  BOOLEAN Success = FALSE;
122  ULONG BufferLength = sizeof(FILE_BASIC_INFORMATION);
123 
124  DPRINT("VfatFastIoQueryBasicInfo()\n");
125 
126  FCB = (PVFATFCB)FileObject->FsContext;
127  if (FCB == NULL)
128  {
129  return FALSE;
130  }
131 
132  FsRtlEnterFileSystem();
133 
134  if (!BooleanFlagOn(FCB->Flags, FCB_IS_PAGE_FILE))
135  {
136  if (!ExAcquireResourceSharedLite(&FCB->MainResource, Wait))
137  {
138  FsRtlExitFileSystem();
139  return FALSE;
140  }
141  }
142 
143  Status = VfatGetBasicInformation(FileObject,
144  FCB,
145  DeviceObject->DeviceExtension,
146  Buffer,
147  &BufferLength);
148 
149  if (!BooleanFlagOn(FCB->Flags, FCB_IS_PAGE_FILE))
150  {
151  ExReleaseResourceLite(&FCB->MainResource);
152  }
153 
154  if (NT_SUCCESS(Status))
155  {
156  IoStatus->Status = STATUS_SUCCESS;
157  IoStatus->Information = sizeof(FILE_BASIC_INFORMATION) - BufferLength;
158  Success = TRUE;
159  }
160 
161  FsRtlExitFileSystem();
162 
163  return Success;
164 }
165 
166 static FAST_IO_QUERY_STANDARD_INFO VfatFastIoQueryStandardInfo;
167 
168 static
169 BOOLEAN
170 NTAPI
171 VfatFastIoQueryStandardInfo(
172  IN PFILE_OBJECT FileObject,
173  IN BOOLEAN Wait,
174  OUT PFILE_STANDARD_INFORMATION Buffer,
175  OUT PIO_STATUS_BLOCK IoStatus,
176  IN PDEVICE_OBJECT DeviceObject)
177 {
178  NTSTATUS Status;
179  PVFATFCB FCB = NULL;
180  BOOLEAN Success = FALSE;
181  ULONG BufferLength = sizeof(FILE_STANDARD_INFORMATION);
182 
183  DPRINT("VfatFastIoQueryStandardInfo()\n");
184 
185  UNREFERENCED_PARAMETER(DeviceObject);
186 
187  FCB = (PVFATFCB)FileObject->FsContext;
188  if (FCB == NULL)
189  {
190  return FALSE;
191  }
192 
193  FsRtlEnterFileSystem();
194 
195  if (!BooleanFlagOn(FCB->Flags, FCB_IS_PAGE_FILE))
196  {
197  if (!ExAcquireResourceSharedLite(&FCB->MainResource, Wait))
198  {
199  FsRtlExitFileSystem();
200  return FALSE;
201  }
202  }
203 
204  Status = VfatGetStandardInformation(FCB,
205  Buffer,
206  &BufferLength);
207 
208  if (!BooleanFlagOn(FCB->Flags, FCB_IS_PAGE_FILE))
209  {
210  ExReleaseResourceLite(&FCB->MainResource);
211  }
212 
213  if (NT_SUCCESS(Status))
214  {
215  IoStatus->Status = STATUS_SUCCESS;
216  IoStatus->Information = sizeof(FILE_STANDARD_INFORMATION) - BufferLength;
217  Success = TRUE;
218  }
219 
220  FsRtlExitFileSystem();
221 
222  return Success;
223 }
224 
225 static FAST_IO_LOCK VfatFastIoLock;
226 
227 static
228 BOOLEAN
229 NTAPI
230 VfatFastIoLock(
231  IN PFILE_OBJECT FileObject,
232  IN PLARGE_INTEGER FileOffset,
233  IN PLARGE_INTEGER Length,
234  PEPROCESS ProcessId,
235  ULONG Key,
236  BOOLEAN FailImmediately,
237  BOOLEAN ExclusiveLock,
238  OUT PIO_STATUS_BLOCK IoStatus,
239  IN PDEVICE_OBJECT DeviceObject)
240 {
241  DPRINT("VfatFastIoLock\n");
242 
243  UNREFERENCED_PARAMETER(FileObject);
244  UNREFERENCED_PARAMETER(FileOffset);
245  UNREFERENCED_PARAMETER(Length);
246  UNREFERENCED_PARAMETER(ProcessId);
247  UNREFERENCED_PARAMETER(Key);
248  UNREFERENCED_PARAMETER(FailImmediately);
249  UNREFERENCED_PARAMETER(ExclusiveLock);
250  UNREFERENCED_PARAMETER(IoStatus);
251  UNREFERENCED_PARAMETER(DeviceObject);
252 
253  return FALSE;
254 }
255 
256 static FAST_IO_UNLOCK_SINGLE VfatFastIoUnlockSingle;
257 
258 static
259 BOOLEAN
260 NTAPI
261 VfatFastIoUnlockSingle(
262  IN PFILE_OBJECT FileObject,
263  IN PLARGE_INTEGER FileOffset,
264  IN PLARGE_INTEGER Length,
265  PEPROCESS ProcessId,
266  ULONG Key,
267  OUT PIO_STATUS_BLOCK IoStatus,
268  IN PDEVICE_OBJECT DeviceObject)
269 {
270  DPRINT("VfatFastIoUnlockSingle\n");
271 
272  UNREFERENCED_PARAMETER(FileObject);
273  UNREFERENCED_PARAMETER(FileOffset);
274  UNREFERENCED_PARAMETER(Length);
275  UNREFERENCED_PARAMETER(ProcessId);
276  UNREFERENCED_PARAMETER(Key);
277  UNREFERENCED_PARAMETER(IoStatus);
278  UNREFERENCED_PARAMETER(DeviceObject);
279 
280  return FALSE;
281 }
282 
283 static FAST_IO_UNLOCK_ALL VfatFastIoUnlockAll;
284 
285 static
286 BOOLEAN
287 NTAPI
288 VfatFastIoUnlockAll(
289  IN PFILE_OBJECT FileObject,
290  PEPROCESS ProcessId,
291  OUT PIO_STATUS_BLOCK IoStatus,
292  IN PDEVICE_OBJECT DeviceObject)
293 {
294  DPRINT("VfatFastIoUnlockAll\n");
295 
296  UNREFERENCED_PARAMETER(FileObject);
297  UNREFERENCED_PARAMETER(ProcessId);
298  UNREFERENCED_PARAMETER(IoStatus);
299  UNREFERENCED_PARAMETER(DeviceObject);
300 
301  return FALSE;
302 }
303 
304 static FAST_IO_UNLOCK_ALL_BY_KEY VfatFastIoUnlockAllByKey;
305 
306 static
307 BOOLEAN
308 NTAPI
309 VfatFastIoUnlockAllByKey(
310  IN PFILE_OBJECT FileObject,
311  PVOID ProcessId,
312  ULONG Key,
313  OUT PIO_STATUS_BLOCK IoStatus,
314  IN PDEVICE_OBJECT DeviceObject)
315 {
316  DPRINT("VfatFastIoUnlockAllByKey\n");
317 
318  UNREFERENCED_PARAMETER(FileObject);
319  UNREFERENCED_PARAMETER(ProcessId);
320  UNREFERENCED_PARAMETER(Key);
321  UNREFERENCED_PARAMETER(IoStatus);
322  UNREFERENCED_PARAMETER(DeviceObject);
323 
324  return FALSE;
325 }
326 
327 static FAST_IO_DEVICE_CONTROL VfatFastIoDeviceControl;
328 
329 static
330 BOOLEAN
331 NTAPI
332 VfatFastIoDeviceControl(
333  IN PFILE_OBJECT FileObject,
334  IN BOOLEAN Wait,
335  IN PVOID InputBuffer OPTIONAL,
336  IN ULONG InputBufferLength,
337  OUT PVOID OutputBuffer OPTIONAL,
338  IN ULONG OutputBufferLength,
339  IN ULONG IoControlCode,
340  OUT PIO_STATUS_BLOCK IoStatus,
341  IN PDEVICE_OBJECT DeviceObject)
342 {
343  DPRINT("VfatFastIoDeviceControl\n");
344 
345  UNREFERENCED_PARAMETER(FileObject);
346  UNREFERENCED_PARAMETER(Wait);
347  UNREFERENCED_PARAMETER(InputBuffer);
348  UNREFERENCED_PARAMETER(InputBufferLength);
349  UNREFERENCED_PARAMETER(OutputBuffer);
350  UNREFERENCED_PARAMETER(OutputBufferLength);
351  UNREFERENCED_PARAMETER(IoControlCode);
352  UNREFERENCED_PARAMETER(IoStatus);
353  UNREFERENCED_PARAMETER(DeviceObject);
354 
355  return FALSE;
356 }
357 
358 static FAST_IO_ACQUIRE_FILE VfatAcquireFileForNtCreateSection;
359 
360 static
361 VOID
362 NTAPI
363 VfatAcquireFileForNtCreateSection(
364  IN PFILE_OBJECT FileObject)
365 {
366  DPRINT("VfatAcquireFileForNtCreateSection\n");
367  UNREFERENCED_PARAMETER(FileObject);
368 }
369 
370 static FAST_IO_RELEASE_FILE VfatReleaseFileForNtCreateSection;
371 
372 static
373 VOID
374 NTAPI
375 VfatReleaseFileForNtCreateSection(
376  IN PFILE_OBJECT FileObject)
377 {
378  DPRINT("VfatReleaseFileForNtCreateSection\n");
379  UNREFERENCED_PARAMETER(FileObject);
380 }
381 
382 static FAST_IO_DETACH_DEVICE VfatFastIoDetachDevice;
383 
384 static
385 VOID
386 NTAPI
387 VfatFastIoDetachDevice(
388  IN PDEVICE_OBJECT SourceDevice,
389  IN PDEVICE_OBJECT TargetDevice)
390 {
391  DPRINT("VfatFastIoDetachDevice\n");
392  UNREFERENCED_PARAMETER(SourceDevice);
393  UNREFERENCED_PARAMETER(TargetDevice);
394 }
395 
396 static FAST_IO_QUERY_NETWORK_OPEN_INFO VfatFastIoQueryNetworkOpenInfo;
397 
398 static
399 BOOLEAN
400 NTAPI
401 VfatFastIoQueryNetworkOpenInfo(
402  IN PFILE_OBJECT FileObject,
403  IN BOOLEAN Wait,
404  OUT PFILE_NETWORK_OPEN_INFORMATION Buffer,
405  OUT PIO_STATUS_BLOCK IoStatus,
406  IN PDEVICE_OBJECT DeviceObject)
407 {
408  DPRINT("VfatFastIoQueryNetworkOpenInfo\n");
409 
410  UNREFERENCED_PARAMETER(FileObject);
411  UNREFERENCED_PARAMETER(Wait);
412  UNREFERENCED_PARAMETER(Buffer);
413  UNREFERENCED_PARAMETER(IoStatus);
414  UNREFERENCED_PARAMETER(DeviceObject);
415 
416  return FALSE;
417 }
418 
419 static FAST_IO_ACQUIRE_FOR_MOD_WRITE VfatAcquireForModWrite;
420 
421 static
422 NTSTATUS
423 NTAPI
424 VfatAcquireForModWrite(
425  IN PFILE_OBJECT FileObject,
426  IN PLARGE_INTEGER EndingOffset,
427  OUT PERESOURCE* ResourceToRelease,
428  IN PDEVICE_OBJECT DeviceObject)
429 {
430  DPRINT("VfatAcquireForModWrite\n");
431 
432  UNREFERENCED_PARAMETER(FileObject);
433  UNREFERENCED_PARAMETER(EndingOffset);
434  UNREFERENCED_PARAMETER(ResourceToRelease);
435  UNREFERENCED_PARAMETER(DeviceObject);
436 
437  return STATUS_INVALID_DEVICE_REQUEST;
438 }
439 
440 static FAST_IO_MDL_READ VfatMdlRead;
441 
442 static
443 BOOLEAN
444 NTAPI
445 VfatMdlRead(
446  IN PFILE_OBJECT FileObject,
447  IN PLARGE_INTEGER FileOffset,
448  IN ULONG Length,
449  IN ULONG LockKey,
450  OUT PMDL* MdlChain,
451  OUT PIO_STATUS_BLOCK IoStatus,
452  IN PDEVICE_OBJECT DeviceObject)
453 {
454  DPRINT("VfatMdlRead\n");
455 
456  UNREFERENCED_PARAMETER(FileObject);
457  UNREFERENCED_PARAMETER(FileOffset);
458  UNREFERENCED_PARAMETER(Length);
459  UNREFERENCED_PARAMETER(LockKey);
460  UNREFERENCED_PARAMETER(MdlChain);
461  UNREFERENCED_PARAMETER(IoStatus);
462  UNREFERENCED_PARAMETER(DeviceObject);
463 
464  return FALSE;
465 }
466 
467 static FAST_IO_MDL_READ_COMPLETE VfatMdlReadComplete;
468 
469 static
470 BOOLEAN
471 NTAPI
472 VfatMdlReadComplete(
473  IN PFILE_OBJECT FileObject,
474  IN PMDL MdlChain,
475  IN PDEVICE_OBJECT DeviceObject)
476 {
477  DPRINT("VfatMdlReadComplete\n");
478 
479  UNREFERENCED_PARAMETER(FileObject);
480  UNREFERENCED_PARAMETER(MdlChain);
481  UNREFERENCED_PARAMETER(DeviceObject);
482 
483  return FALSE;
484 }
485 
486 static FAST_IO_PREPARE_MDL_WRITE VfatPrepareMdlWrite;
487 
488 static
489 BOOLEAN
490 NTAPI
491 VfatPrepareMdlWrite(
492  IN PFILE_OBJECT FileObject,
493  IN PLARGE_INTEGER FileOffset,
494  IN ULONG Length,
495  IN ULONG LockKey,
496  OUT PMDL* MdlChain,
497  OUT PIO_STATUS_BLOCK IoStatus,
498  IN PDEVICE_OBJECT DeviceObject)
499 {
500  DPRINT("VfatPrepareMdlWrite\n");
501 
502  UNREFERENCED_PARAMETER(FileObject);
503  UNREFERENCED_PARAMETER(FileOffset);
504  UNREFERENCED_PARAMETER(Length);
505  UNREFERENCED_PARAMETER(LockKey);
506  UNREFERENCED_PARAMETER(MdlChain);
507  UNREFERENCED_PARAMETER(IoStatus);
508  UNREFERENCED_PARAMETER(DeviceObject);
509 
510  return FALSE;
511 }
512 
513 static FAST_IO_MDL_WRITE_COMPLETE VfatMdlWriteComplete;
514 
515 static
516 BOOLEAN
517 NTAPI
518 VfatMdlWriteComplete(
519  IN PFILE_OBJECT FileObject,
520  IN PLARGE_INTEGER FileOffset,
521  IN PMDL MdlChain,
522  IN PDEVICE_OBJECT DeviceObject)
523 {
524  DPRINT("VfatMdlWriteComplete\n");
525 
526  UNREFERENCED_PARAMETER(FileObject);
527  UNREFERENCED_PARAMETER(FileOffset);
528  UNREFERENCED_PARAMETER(MdlChain);
529  UNREFERENCED_PARAMETER(DeviceObject);
530 
531  return FALSE;
532 }
533 
534 static FAST_IO_READ_COMPRESSED VfatFastIoReadCompressed;
535 
536 static
537 BOOLEAN
538 NTAPI
539 VfatFastIoReadCompressed(
540  IN PFILE_OBJECT FileObject,
541  IN PLARGE_INTEGER FileOffset,
542  IN ULONG Length,
543  IN ULONG LockKey,
544  OUT PVOID Buffer,
545  OUT PMDL* MdlChain,
546  OUT PIO_STATUS_BLOCK IoStatus,
547  OUT PCOMPRESSED_DATA_INFO CompressedDataInfo,
548  IN ULONG CompressedDataInfoLength,
549  IN PDEVICE_OBJECT DeviceObject)
550 {
551  DPRINT("VfatFastIoReadCompressed\n");
552 
553  UNREFERENCED_PARAMETER(FileObject);
554  UNREFERENCED_PARAMETER(FileOffset);
555  UNREFERENCED_PARAMETER(Length);
556  UNREFERENCED_PARAMETER(LockKey);
557  UNREFERENCED_PARAMETER(Buffer);
558  UNREFERENCED_PARAMETER(MdlChain);
559  UNREFERENCED_PARAMETER(IoStatus);
560  UNREFERENCED_PARAMETER(CompressedDataInfo);
561  UNREFERENCED_PARAMETER(CompressedDataInfoLength);
562  UNREFERENCED_PARAMETER(DeviceObject);
563 
564  return FALSE;
565 }
566 
567 static FAST_IO_WRITE_COMPRESSED VfatFastIoWriteCompressed;
568 
569 static
570 BOOLEAN
571 NTAPI
572 VfatFastIoWriteCompressed(
573  IN PFILE_OBJECT FileObject,
574  IN PLARGE_INTEGER FileOffset,
575  IN ULONG Length,
576  IN ULONG LockKey,
577  IN PVOID Buffer,
578  OUT PMDL* MdlChain,
579  OUT PIO_STATUS_BLOCK IoStatus,
580  IN PCOMPRESSED_DATA_INFO CompressedDataInfo,
581  IN ULONG CompressedDataInfoLength,
582  IN PDEVICE_OBJECT DeviceObject)
583 {
584  DPRINT("VfatFastIoWriteCompressed\n");
585 
586  UNREFERENCED_PARAMETER(FileObject);
587  UNREFERENCED_PARAMETER(FileOffset);
588  UNREFERENCED_PARAMETER(Length);
589  UNREFERENCED_PARAMETER(LockKey);
590  UNREFERENCED_PARAMETER(Buffer);
591  UNREFERENCED_PARAMETER(MdlChain);
592  UNREFERENCED_PARAMETER(IoStatus);
593  UNREFERENCED_PARAMETER(CompressedDataInfo);
594  UNREFERENCED_PARAMETER(CompressedDataInfoLength);
595  UNREFERENCED_PARAMETER(DeviceObject);
596 
597  return FALSE;
598 }
599 
600 static FAST_IO_MDL_READ_COMPLETE_COMPRESSED VfatMdlReadCompleteCompressed;
601 
602 static
603 BOOLEAN
604 NTAPI
605 VfatMdlReadCompleteCompressed(
606  IN PFILE_OBJECT FileObject,
607  IN PMDL MdlChain,
608  IN PDEVICE_OBJECT DeviceObject)
609 {
610  DPRINT("VfatMdlReadCompleteCompressed\n");
611 
612  UNREFERENCED_PARAMETER(FileObject);
613  UNREFERENCED_PARAMETER(MdlChain);
614  UNREFERENCED_PARAMETER(DeviceObject);
615 
616  return FALSE;
617 }
618 
619 static FAST_IO_MDL_WRITE_COMPLETE_COMPRESSED VfatMdlWriteCompleteCompressed;
620 
621 static
622 BOOLEAN
623 NTAPI
624 VfatMdlWriteCompleteCompressed(
625  IN PFILE_OBJECT FileObject,
626  IN PLARGE_INTEGER FileOffset,
627  IN PMDL MdlChain,
628  IN PDEVICE_OBJECT DeviceObject)
629 {
630  DPRINT("VfatMdlWriteCompleteCompressed\n");
631 
632  UNREFERENCED_PARAMETER(FileObject);
633  UNREFERENCED_PARAMETER(FileOffset);
634  UNREFERENCED_PARAMETER(MdlChain);
635  UNREFERENCED_PARAMETER(DeviceObject);
636 
637  return FALSE;
638 }
639 
640 static FAST_IO_QUERY_OPEN VfatFastIoQueryOpen;
641 
642 static
643 BOOLEAN
644 NTAPI
645 VfatFastIoQueryOpen(
646  IN PIRP Irp,
647  OUT PFILE_NETWORK_OPEN_INFORMATION NetworkInformation,
648  IN PDEVICE_OBJECT DeviceObject)
649 {
650  DPRINT("VfatFastIoQueryOpen\n");
651 
652  UNREFERENCED_PARAMETER(Irp);
653  UNREFERENCED_PARAMETER(NetworkInformation);
654  UNREFERENCED_PARAMETER(DeviceObject);
655 
656  return FALSE;
657 }
658 
659 static FAST_IO_RELEASE_FOR_MOD_WRITE VfatReleaseForModWrite;
660 
661 static
662 NTSTATUS
663 NTAPI
664 VfatReleaseForModWrite(
665  IN PFILE_OBJECT FileObject,
666  IN PERESOURCE ResourceToRelease,
667  IN PDEVICE_OBJECT DeviceObject)
668 {
669  DPRINT("VfatReleaseForModWrite\n");
670 
671  UNREFERENCED_PARAMETER(FileObject);
672  UNREFERENCED_PARAMETER(ResourceToRelease);
673  UNREFERENCED_PARAMETER(DeviceObject);
674 
675  return STATUS_INVALID_DEVICE_REQUEST;
676 }
677 
678 static FAST_IO_ACQUIRE_FOR_CCFLUSH VfatAcquireForCcFlush;
679 
680 static
681 NTSTATUS
682 NTAPI
683 VfatAcquireForCcFlush(
684  IN PFILE_OBJECT FileObject,
685  IN PDEVICE_OBJECT DeviceObject)
686 {
687  PVFATFCB Fcb = (PVFATFCB)FileObject->FsContext;
688 
689  DPRINT("VfatAcquireForCcFlush\n");
690 
691  UNREFERENCED_PARAMETER(DeviceObject);
692 
693  /* Make sure it is not a volume lock */
694  ASSERT(!BooleanFlagOn(Fcb->Flags, FCB_IS_VOLUME));
695 
696  /* Acquire the resource */
697  ExAcquireResourceExclusiveLite(&(Fcb->MainResource), TRUE);
698 
699  return STATUS_SUCCESS;
700 }
701 
702 static FAST_IO_RELEASE_FOR_CCFLUSH VfatReleaseForCcFlush;
703 
704 static
705 NTSTATUS
706 NTAPI
707 VfatReleaseForCcFlush(
708  IN PFILE_OBJECT FileObject,
709  IN PDEVICE_OBJECT DeviceObject)
710 {
711  PVFATFCB Fcb = (PVFATFCB)FileObject->FsContext;
712 
713  DPRINT("VfatReleaseForCcFlush\n");
714 
715  UNREFERENCED_PARAMETER(DeviceObject);
716 
717  /* Make sure it is not a volume lock */
718  ASSERT(!BooleanFlagOn(Fcb->Flags, FCB_IS_VOLUME));
719 
720  /* Release the resource */
721  ExReleaseResourceLite(&(Fcb->MainResource));
722 
723  return STATUS_SUCCESS;
724 }
725 
726 BOOLEAN
727 NTAPI
728 VfatAcquireForLazyWrite(
729  IN PVOID Context,
730  IN BOOLEAN Wait)
731 {
732  PVFATFCB Fcb = (PVFATFCB)Context;
733  ASSERT(Fcb);
734  DPRINT("VfatAcquireForLazyWrite(): Fcb %p\n", Fcb);
735 
736  if (!ExAcquireResourceExclusiveLite(&(Fcb->MainResource), Wait))
737  {
738  DPRINT("VfatAcquireForLazyWrite(): ExReleaseResourceLite failed.\n");
739  return FALSE;
740  }
741  return TRUE;
742 }
743 
744 VOID
745 NTAPI
746 VfatReleaseFromLazyWrite(
747  IN PVOID Context)
748 {
749  PVFATFCB Fcb = (PVFATFCB)Context;
750  ASSERT(Fcb);
751  DPRINT("VfatReleaseFromLazyWrite(): Fcb %p\n", Fcb);
752 
753  ExReleaseResourceLite(&(Fcb->MainResource));
754 }
755 
756 INIT_FUNCTION
757 VOID
758 VfatInitFastIoRoutines(
759  PFAST_IO_DISPATCH FastIoDispatch)
760 {
761  FastIoDispatch->SizeOfFastIoDispatch = sizeof(FAST_IO_DISPATCH);
762  FastIoDispatch->FastIoCheckIfPossible = VfatFastIoCheckIfPossible;
763  FastIoDispatch->FastIoRead = VfatFastIoRead;
764  FastIoDispatch->FastIoWrite = VfatFastIoWrite;
765  FastIoDispatch->FastIoQueryBasicInfo = VfatFastIoQueryBasicInfo;
766  FastIoDispatch->FastIoQueryStandardInfo = VfatFastIoQueryStandardInfo;
767  FastIoDispatch->FastIoLock = VfatFastIoLock;
768  FastIoDispatch->FastIoUnlockSingle = VfatFastIoUnlockSingle;
769  FastIoDispatch->FastIoUnlockAll = VfatFastIoUnlockAll;
770  FastIoDispatch->FastIoUnlockAllByKey = VfatFastIoUnlockAllByKey;
771  FastIoDispatch->FastIoDeviceControl = VfatFastIoDeviceControl;
772  FastIoDispatch->AcquireFileForNtCreateSection = VfatAcquireFileForNtCreateSection;
773  FastIoDispatch->ReleaseFileForNtCreateSection = VfatReleaseFileForNtCreateSection;
774  FastIoDispatch->FastIoDetachDevice = VfatFastIoDetachDevice;
775  FastIoDispatch->FastIoQueryNetworkOpenInfo = VfatFastIoQueryNetworkOpenInfo;
776  FastIoDispatch->MdlRead = VfatMdlRead;
777  FastIoDispatch->MdlReadComplete = VfatMdlReadComplete;
778  FastIoDispatch->PrepareMdlWrite = VfatPrepareMdlWrite;
779  FastIoDispatch->MdlWriteComplete = VfatMdlWriteComplete;
780  FastIoDispatch->FastIoReadCompressed = VfatFastIoReadCompressed;
781  FastIoDispatch->FastIoWriteCompressed = VfatFastIoWriteCompressed;
782  FastIoDispatch->MdlReadCompleteCompressed = VfatMdlReadCompleteCompressed;
783  FastIoDispatch->MdlWriteCompleteCompressed = VfatMdlWriteCompleteCompressed;
784  FastIoDispatch->FastIoQueryOpen = VfatFastIoQueryOpen;
785  FastIoDispatch->AcquireForModWrite = VfatAcquireForModWrite;
786  FastIoDispatch->ReleaseForModWrite = VfatReleaseForModWrite;
787  FastIoDispatch->AcquireForCcFlush = VfatAcquireForCcFlush;
788  FastIoDispatch->ReleaseForCcFlush = VfatReleaseForCcFlush;
789 }
EndingOffset
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