2 * COPYRIGHT: See COPYING in the top level directory
3 * PROJECT: ReactOS kernel
4 * FILE: drivers/fs/vfat/rw.c
5 * PURPOSE: VFAT Filesystem
6 * PROGRAMMER: Jason Filby (jasonfilby@yahoo.com)
10 /* INCLUDES *****************************************************************/
18 * Uncomment to enable strict verification of cluster/offset pair
19 * caching. If this option is enabled you lose all the benefits of
20 * the caching and the read/write operations will actually be
21 * slower. It's meant only for debugging!!!
22 * - Filip Navara, 26/07/2004
24 /* #define DEBUG_VERIFY_OFFSET_CACHING */
26 /* FUNCTIONS *****************************************************************/
29 * Return the next cluster in a FAT chain, possibly extending the chain if
34 PDEVICE_EXTENSION DeviceExt
,
36 PULONG CurrentCluster
,
39 if (FirstCluster
== 1)
41 (*CurrentCluster
) += DeviceExt
->FatInfo
.SectorsPerCluster
;
42 return STATUS_SUCCESS
;
47 return GetNextClusterExtend(DeviceExt
, (*CurrentCluster
), CurrentCluster
);
49 return GetNextCluster(DeviceExt
, (*CurrentCluster
), CurrentCluster
);
55 PDEVICE_EXTENSION DeviceExt
,
65 DPRINT("OffsetToCluster(DeviceExt %x, Fcb %x, FirstCluster %x,"
66 " FileOffset %x, Cluster %x, Extend %d)\n", DeviceExt,
67 Fcb, FirstCluster, FileOffset, Cluster, Extend);
69 if (FirstCluster
== 0)
71 DbgPrint("OffsetToCluster is called with FirstCluster = 0!\n");
75 if (FirstCluster
== 1)
77 /* root of FAT16 or FAT12 */
78 *Cluster
= DeviceExt
->FatInfo
.rootStart
+ FileOffset
79 / (DeviceExt
->FatInfo
.BytesPerCluster
) * DeviceExt
->FatInfo
.SectorsPerCluster
;
80 return STATUS_SUCCESS
;
84 CurrentCluster
= FirstCluster
;
87 for (i
= 0; i
< FileOffset
/ DeviceExt
->FatInfo
.BytesPerCluster
; i
++)
89 Status
= GetNextClusterExtend (DeviceExt
, CurrentCluster
, &CurrentCluster
);
90 if (!NT_SUCCESS(Status
))
93 *Cluster
= CurrentCluster
;
97 for (i
= 0; i
< FileOffset
/ DeviceExt
->FatInfo
.BytesPerCluster
; i
++)
99 Status
= GetNextCluster (DeviceExt
, CurrentCluster
, &CurrentCluster
);
100 if (!NT_SUCCESS(Status
))
103 *Cluster
= CurrentCluster
;
105 return STATUS_SUCCESS
;
110 * FUNCTION: Reads data from a file
115 PVFAT_IRP_CONTEXT IrpContext
,
117 LARGE_INTEGER ReadOffset
,
120 ULONG CurrentCluster
;
124 LARGE_INTEGER StartOffset
;
125 PDEVICE_EXTENSION DeviceExt
;
126 BOOLEAN First
= TRUE
;
130 ULONG BytesPerSector
;
131 ULONG BytesPerCluster
;
137 DeviceExt
= IrpContext
->DeviceExt
;
139 ASSERT(DeviceExt
->FatInfo
.BytesPerCluster
);
140 ASSERT(IrpContext
->FileObject
);
141 ASSERT(IrpContext
->FileObject
->FsContext2
!= NULL
);
143 DPRINT("VfatReadFileData(DeviceExt %p, FileObject %p, "
144 "Length %u, ReadOffset 0x%I64x)\n", DeviceExt
,
145 IrpContext
->FileObject
, Length
, ReadOffset
.QuadPart
);
149 Fcb
= IrpContext
->FileObject
->FsContext
;
150 BytesPerSector
= DeviceExt
->FatInfo
.BytesPerSector
;
151 BytesPerCluster
= DeviceExt
->FatInfo
.BytesPerCluster
;
153 ASSERT(ReadOffset
.QuadPart
+ Length
<= ROUND_UP_64(Fcb
->RFCB
.FileSize
.QuadPart
, BytesPerSector
));
154 ASSERT(ReadOffset
.u
.LowPart
% BytesPerSector
== 0);
155 ASSERT(Length
% BytesPerSector
== 0);
157 /* Is this a read of the FAT? */
158 if (BooleanFlagOn(Fcb
->Flags
, FCB_IS_FAT
))
160 ReadOffset
.QuadPart
+= DeviceExt
->FatInfo
.FATStart
* BytesPerSector
;
161 Status
= VfatReadDiskPartial(IrpContext
, &ReadOffset
, Length
, 0, TRUE
);
163 if (NT_SUCCESS(Status
))
165 *LengthRead
= Length
;
169 DPRINT1("FAT reading failed, Status %x\n", Status
);
174 /* Is this a read of the Volume ? */
175 if (BooleanFlagOn(Fcb
->Flags
, FCB_IS_VOLUME
))
177 Status
= VfatReadDiskPartial(IrpContext
, &ReadOffset
, Length
, 0, TRUE
);
178 if (NT_SUCCESS(Status
))
180 *LengthRead
= Length
;
184 DPRINT1("Volume reading failed, Status %x\n", Status
);
189 /* Find the first cluster */
191 CurrentCluster
= vfatDirEntryGetFirstCluster (DeviceExt
, &Fcb
->entry
);
193 if (FirstCluster
== 1)
195 /* Directory of FAT12/16 needs a special handling */
196 if (ReadOffset
.u
.LowPart
+ Length
> DeviceExt
->FatInfo
.rootDirectorySectors
* BytesPerSector
)
198 Length
= DeviceExt
->FatInfo
.rootDirectorySectors
* BytesPerSector
- ReadOffset
.u
.LowPart
;
200 ReadOffset
.u
.LowPart
+= DeviceExt
->FatInfo
.rootStart
* BytesPerSector
;
202 /* Fire up the read command */
203 Status
= VfatReadDiskPartial (IrpContext
, &ReadOffset
, Length
, 0, TRUE
);
204 if (NT_SUCCESS(Status
))
206 *LengthRead
= Length
;
211 ExAcquireFastMutex(&Fcb
->LastMutex
);
212 LastCluster
= Fcb
->LastCluster
;
213 LastOffset
= Fcb
->LastOffset
;
214 ExReleaseFastMutex(&Fcb
->LastMutex
);
216 /* Find the cluster to start the read from */
217 if (LastCluster
> 0 && ReadOffset
.u
.LowPart
>= LastOffset
)
219 Status
= OffsetToCluster(DeviceExt
, LastCluster
,
220 ROUND_DOWN(ReadOffset
.u
.LowPart
, BytesPerCluster
) -
222 &CurrentCluster
, FALSE
);
223 #ifdef DEBUG_VERIFY_OFFSET_CACHING
224 /* DEBUG VERIFICATION */
226 ULONG CorrectCluster
;
227 OffsetToCluster(DeviceExt
, FirstCluster
,
228 ROUND_DOWN(ReadOffset
.u
.LowPart
, BytesPerCluster
),
229 &CorrectCluster
, FALSE
);
230 if (CorrectCluster
!= CurrentCluster
)
231 KeBugCheck(FAT_FILE_SYSTEM
);
237 Status
= OffsetToCluster(DeviceExt
, FirstCluster
,
238 ROUND_DOWN(ReadOffset
.u
.LowPart
, BytesPerCluster
),
239 &CurrentCluster
, FALSE
);
242 if (!NT_SUCCESS(Status
))
247 ExAcquireFastMutex(&Fcb
->LastMutex
);
248 Fcb
->LastCluster
= CurrentCluster
;
249 Fcb
->LastOffset
= ROUND_DOWN (ReadOffset
.u
.LowPart
, BytesPerCluster
);
250 ExReleaseFastMutex(&Fcb
->LastMutex
);
252 KeInitializeEvent(&IrpContext
->Event
, NotificationEvent
, FALSE
);
253 IrpContext
->RefCount
= 1;
255 while (Length
> 0 && CurrentCluster
!= 0xffffffff)
257 StartCluster
= CurrentCluster
;
258 StartOffset
.QuadPart
= ClusterToSector(DeviceExt
, StartCluster
) * BytesPerSector
;
267 BytesDone
= min (Length
, BytesPerCluster
- (ReadOffset
.u
.LowPart
% BytesPerCluster
));
268 StartOffset
.QuadPart
+= ReadOffset
.u
.LowPart
% BytesPerCluster
;
273 if (Length
- BytesDone
> BytesPerCluster
)
275 BytesDone
+= BytesPerCluster
;
282 Status
= NextCluster(DeviceExt
, FirstCluster
, &CurrentCluster
, FALSE
);
284 while (StartCluster
+ ClusterCount
== CurrentCluster
&& NT_SUCCESS(Status
) && Length
> BytesDone
);
285 DPRINT("start %08x, next %08x, count %u\n",
286 StartCluster
, CurrentCluster
, ClusterCount
);
288 ExAcquireFastMutex(&Fcb
->LastMutex
);
289 Fcb
->LastCluster
= StartCluster
+ (ClusterCount
- 1);
290 Fcb
->LastOffset
= ROUND_DOWN(ReadOffset
.u
.LowPart
, BytesPerCluster
) + (ClusterCount
- 1) * BytesPerCluster
;
291 ExReleaseFastMutex(&Fcb
->LastMutex
);
293 /* Fire up the read command */
294 Status
= VfatReadDiskPartial (IrpContext
, &StartOffset
, BytesDone
, *LengthRead
, FALSE
);
295 if (!NT_SUCCESS(Status
) && Status
!= STATUS_PENDING
)
299 *LengthRead
+= BytesDone
;
301 ReadOffset
.u
.LowPart
+= BytesDone
;
304 if (InterlockedDecrement((PLONG
)&IrpContext
->RefCount
) != 0)
306 KeWaitForSingleObject(&IrpContext
->Event
, Executive
, KernelMode
, FALSE
, NULL
);
309 if (NT_SUCCESS(Status
) || Status
== STATUS_PENDING
)
313 Status
= STATUS_UNSUCCESSFUL
;
317 Status
= IrpContext
->Irp
->IoStatus
.Status
;
327 PVFAT_IRP_CONTEXT IrpContext
,
329 LARGE_INTEGER WriteOffset
)
331 PDEVICE_EXTENSION DeviceExt
;
335 ULONG CurrentCluster
;
339 NTSTATUS Status
= STATUS_SUCCESS
;
340 BOOLEAN First
= TRUE
;
341 ULONG BytesPerSector
;
342 ULONG BytesPerCluster
;
343 LARGE_INTEGER StartOffset
;
350 DeviceExt
= IrpContext
->DeviceExt
;
352 ASSERT(DeviceExt
->FatInfo
.BytesPerCluster
);
353 ASSERT(IrpContext
->FileObject
);
354 ASSERT(IrpContext
->FileObject
->FsContext2
!= NULL
);
356 Fcb
= IrpContext
->FileObject
->FsContext
;
357 BytesPerCluster
= DeviceExt
->FatInfo
.BytesPerCluster
;
358 BytesPerSector
= DeviceExt
->FatInfo
.BytesPerSector
;
360 DPRINT("VfatWriteFileData(DeviceExt %p, FileObject %p, "
361 "Length %u, WriteOffset 0x%I64x), '%wZ'\n", DeviceExt
,
362 IrpContext
->FileObject
, Length
, WriteOffset
.QuadPart
,
365 ASSERT(WriteOffset
.QuadPart
+ Length
<= Fcb
->RFCB
.AllocationSize
.QuadPart
);
366 ASSERT(WriteOffset
.u
.LowPart
% BytesPerSector
== 0);
367 ASSERT(Length
% BytesPerSector
== 0);
369 /* Is this a write of the volume? */
370 if (BooleanFlagOn(Fcb
->Flags
, FCB_IS_VOLUME
))
372 Status
= VfatWriteDiskPartial(IrpContext
, &WriteOffset
, Length
, 0, TRUE
);
373 if (!NT_SUCCESS(Status
))
375 DPRINT1("Volume writing failed, Status %x\n", Status
);
380 /* Is this a write to the FAT? */
381 if (BooleanFlagOn(Fcb
->Flags
, FCB_IS_FAT
))
383 WriteOffset
.u
.LowPart
+= DeviceExt
->FatInfo
.FATStart
* BytesPerSector
;
384 IrpContext
->RefCount
= 1;
385 for (Count
= 0; Count
< DeviceExt
->FatInfo
.FATCount
; Count
++)
387 Status
= VfatWriteDiskPartial(IrpContext
, &WriteOffset
, Length
, 0, FALSE
);
388 if (!NT_SUCCESS(Status
) && Status
!= STATUS_PENDING
)
390 DPRINT1("FAT writing failed, Status %x\n", Status
);
393 WriteOffset
.u
.LowPart
+= Fcb
->RFCB
.FileSize
.u
.LowPart
;
396 if (InterlockedDecrement((PLONG
)&IrpContext
->RefCount
) != 0)
398 KeWaitForSingleObject(&IrpContext
->Event
, Executive
, KernelMode
, FALSE
, NULL
);
401 if (NT_SUCCESS(Status
) || Status
== STATUS_PENDING
)
403 Status
= IrpContext
->Irp
->IoStatus
.Status
;
409 * Find the first cluster
412 CurrentCluster
= vfatDirEntryGetFirstCluster (DeviceExt
, &Fcb
->entry
);
414 if (FirstCluster
== 1)
416 ASSERT(WriteOffset
.u
.LowPart
+ Length
<= DeviceExt
->FatInfo
.rootDirectorySectors
* BytesPerSector
);
417 // Directory of FAT12/16 needs a special handling
418 WriteOffset
.u
.LowPart
+= DeviceExt
->FatInfo
.rootStart
* BytesPerSector
;
419 // Fire up the write command
420 Status
= VfatWriteDiskPartial (IrpContext
, &WriteOffset
, Length
, 0, TRUE
);
424 ExAcquireFastMutex(&Fcb
->LastMutex
);
425 LastCluster
= Fcb
->LastCluster
;
426 LastOffset
= Fcb
->LastOffset
;
427 ExReleaseFastMutex(&Fcb
->LastMutex
);
430 * Find the cluster to start the write from
432 if (LastCluster
> 0 && WriteOffset
.u
.LowPart
>= LastOffset
)
434 Status
= OffsetToCluster(DeviceExt
, LastCluster
,
435 ROUND_DOWN(WriteOffset
.u
.LowPart
, BytesPerCluster
) -
437 &CurrentCluster
, FALSE
);
438 #ifdef DEBUG_VERIFY_OFFSET_CACHING
439 /* DEBUG VERIFICATION */
441 ULONG CorrectCluster
;
442 OffsetToCluster(DeviceExt
, FirstCluster
,
443 ROUND_DOWN(WriteOffset
.u
.LowPart
, BytesPerCluster
),
444 &CorrectCluster
, FALSE
);
445 if (CorrectCluster
!= CurrentCluster
)
446 KeBugCheck(FAT_FILE_SYSTEM
);
452 Status
= OffsetToCluster(DeviceExt
, FirstCluster
,
453 ROUND_DOWN(WriteOffset
.u
.LowPart
, BytesPerCluster
),
454 &CurrentCluster
, FALSE
);
457 if (!NT_SUCCESS(Status
))
462 ExAcquireFastMutex(&Fcb
->LastMutex
);
463 Fcb
->LastCluster
= CurrentCluster
;
464 Fcb
->LastOffset
= ROUND_DOWN (WriteOffset
.u
.LowPart
, BytesPerCluster
);
465 ExReleaseFastMutex(&Fcb
->LastMutex
);
467 IrpContext
->RefCount
= 1;
470 while (Length
> 0 && CurrentCluster
!= 0xffffffff)
472 StartCluster
= CurrentCluster
;
473 StartOffset
.QuadPart
= ClusterToSector(DeviceExt
, StartCluster
) * BytesPerSector
;
482 BytesDone
= min (Length
, BytesPerCluster
- (WriteOffset
.u
.LowPart
% BytesPerCluster
));
483 StartOffset
.QuadPart
+= WriteOffset
.u
.LowPart
% BytesPerCluster
;
488 if (Length
- BytesDone
> BytesPerCluster
)
490 BytesDone
+= BytesPerCluster
;
497 Status
= NextCluster(DeviceExt
, FirstCluster
, &CurrentCluster
, FALSE
);
499 while (StartCluster
+ ClusterCount
== CurrentCluster
&& NT_SUCCESS(Status
) && Length
> BytesDone
);
500 DPRINT("start %08x, next %08x, count %u\n",
501 StartCluster
, CurrentCluster
, ClusterCount
);
503 ExAcquireFastMutex(&Fcb
->LastMutex
);
504 Fcb
->LastCluster
= StartCluster
+ (ClusterCount
- 1);
505 Fcb
->LastOffset
= ROUND_DOWN(WriteOffset
.u
.LowPart
, BytesPerCluster
) + (ClusterCount
- 1) * BytesPerCluster
;
506 ExReleaseFastMutex(&Fcb
->LastMutex
);
508 // Fire up the write command
509 Status
= VfatWriteDiskPartial (IrpContext
, &StartOffset
, BytesDone
, BufferOffset
, FALSE
);
510 if (!NT_SUCCESS(Status
) && Status
!= STATUS_PENDING
)
514 BufferOffset
+= BytesDone
;
516 WriteOffset
.u
.LowPart
+= BytesDone
;
519 if (InterlockedDecrement((PLONG
)&IrpContext
->RefCount
) != 0)
521 KeWaitForSingleObject(&IrpContext
->Event
, Executive
, KernelMode
, FALSE
, NULL
);
524 if (NT_SUCCESS(Status
) || Status
== STATUS_PENDING
)
528 Status
= STATUS_UNSUCCESSFUL
;
532 Status
= IrpContext
->Irp
->IoStatus
.Status
;
540 PVFAT_IRP_CONTEXT IrpContext
)
545 ULONG ReturnedLength
= 0;
546 PERESOURCE Resource
= NULL
;
547 LARGE_INTEGER ByteOffset
;
549 ULONG BytesPerSector
;
550 BOOLEAN PagingIo
, CanWait
, IsVolume
, NoCache
;
554 DPRINT("VfatRead(IrpContext %p)\n", IrpContext
);
556 ASSERT(IrpContext
->DeviceObject
);
558 // This request is not allowed on the main device object
559 if (IrpContext
->DeviceObject
== VfatGlobalData
->DeviceObject
)
561 DPRINT("VfatRead is called with the main device object.\n");
562 Status
= STATUS_INVALID_DEVICE_REQUEST
;
566 ASSERT(IrpContext
->DeviceExt
);
567 ASSERT(IrpContext
->FileObject
);
568 Fcb
= IrpContext
->FileObject
->FsContext
;
571 if (BooleanFlagOn(Fcb
->Flags
, FCB_IS_PAGE_FILE
))
573 PFATINFO FatInfo
= &IrpContext
->DeviceExt
->FatInfo
;
574 IrpContext
->Stack
->Parameters
.Read
.ByteOffset
.QuadPart
+= FatInfo
->dataStart
* FatInfo
->BytesPerSector
;
575 IoSkipCurrentIrpStackLocation(IrpContext
->Irp
);
576 IrpContext
->Flags
&= ~IRPCONTEXT_COMPLETE
;
577 DPRINT("Read from page file, disk offset %I64x\n", IrpContext
->Stack
->Parameters
.Read
.ByteOffset
.QuadPart
);
578 Status
= IoCallDriver(IrpContext
->DeviceExt
->StorageDevice
, IrpContext
->Irp
);
582 DPRINT("<%wZ>\n", &Fcb
->PathNameU
);
584 ByteOffset
= IrpContext
->Stack
->Parameters
.Read
.ByteOffset
;
585 Length
= IrpContext
->Stack
->Parameters
.Read
.Length
;
586 BytesPerSector
= IrpContext
->DeviceExt
->FatInfo
.BytesPerSector
;
587 PagingIo
= BooleanFlagOn(IrpContext
->Irp
->Flags
, IRP_PAGING_IO
);
588 CanWait
= BooleanFlagOn(IrpContext
->Flags
, IRPCONTEXT_CANWAIT
);
589 IsVolume
= BooleanFlagOn(Fcb
->Flags
, FCB_IS_VOLUME
);
590 NoCache
= BooleanFlagOn(IrpContext
->Irp
->Flags
, IRP_NOCACHE
);
592 /* fail if file is a directory and no paged read */
593 if (vfatFCBIsDirectory(Fcb
) && !PagingIo
)
595 Status
= STATUS_INVALID_PARAMETER
;
599 DPRINT("'%wZ', Offset: %u, Length %u\n", &Fcb
->PathNameU
, ByteOffset
.u
.LowPart
, Length
);
601 if (ByteOffset
.u
.HighPart
&& !IsVolume
)
603 Status
= STATUS_INVALID_PARAMETER
;
609 IrpContext
->Irp
->IoStatus
.Information
= 0;
610 Status
= STATUS_SUCCESS
;
614 if (ByteOffset
.QuadPart
>= Fcb
->RFCB
.FileSize
.QuadPart
)
616 IrpContext
->Irp
->IoStatus
.Information
= 0;
617 Status
= STATUS_END_OF_FILE
;
621 if (NoCache
|| PagingIo
|| IsVolume
)
623 if (ByteOffset
.u
.LowPart
% BytesPerSector
!= 0 || Length
% BytesPerSector
!= 0)
625 DPRINT("%u %u\n", ByteOffset
.u
.LowPart
, Length
);
626 // non cached read must be sector aligned
627 Status
= STATUS_INVALID_PARAMETER
;
634 Resource
= &IrpContext
->DeviceExt
->DirResource
;
638 Resource
= &Fcb
->PagingIoResource
;
642 Resource
= &Fcb
->MainResource
;
645 if (!ExAcquireResourceSharedLite(Resource
, CanWait
))
648 Status
= STATUS_PENDING
;
653 FsRtlAreThereCurrentFileLocks(&Fcb
->FileLock
))
655 if (!FsRtlCheckLockForReadAccess(&Fcb
->FileLock
, IrpContext
->Irp
))
657 Status
= STATUS_FILE_LOCK_CONFLICT
;
662 Buffer
= VfatGetUserBuffer(IrpContext
->Irp
, PagingIo
);
664 if (!PagingIo
&& !NoCache
&& !IsVolume
)
667 Status
= STATUS_SUCCESS
;
668 if (ByteOffset
.u
.LowPart
+ Length
> Fcb
->RFCB
.FileSize
.u
.LowPart
)
670 Length
= Fcb
->RFCB
.FileSize
.u
.LowPart
- ByteOffset
.u
.LowPart
;
671 Status
= /*STATUS_END_OF_FILE*/STATUS_SUCCESS
;
676 if (IrpContext
->FileObject
->PrivateCacheMap
== NULL
)
678 CcInitializeCacheMap(IrpContext
->FileObject
,
679 (PCC_FILE_SIZES
)(&Fcb
->RFCB
.AllocationSize
),
681 &(VfatGlobalData
->CacheMgrCallbacks
),
685 if (!CcCopyRead(IrpContext
->FileObject
,
690 &IrpContext
->Irp
->IoStatus
))
693 Status
= STATUS_PENDING
;
697 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER
)
699 Status
= _SEH2_GetExceptionCode();
704 if (!NT_SUCCESS(IrpContext
->Irp
->IoStatus
.Status
))
706 Status
= IrpContext
->Irp
->IoStatus
.Status
;
712 Status
= VfatLockUserBuffer(IrpContext
->Irp
, Length
, IoWriteAccess
);
713 if (!NT_SUCCESS(Status
))
718 if (ByteOffset
.QuadPart
+ Length
> ROUND_UP_64(Fcb
->RFCB
.FileSize
.QuadPart
, BytesPerSector
))
720 Length
= (ULONG
)(ROUND_UP_64(Fcb
->RFCB
.FileSize
.QuadPart
, BytesPerSector
) - ByteOffset
.QuadPart
);
723 Status
= VfatReadFileData(IrpContext
, Length
, ByteOffset
, &ReturnedLength
);
724 if (NT_SUCCESS(Status
))
726 IrpContext
->Irp
->IoStatus
.Information
= ReturnedLength
;
733 ExReleaseResourceLite(Resource
);
736 if (Status
== STATUS_PENDING
)
738 Status
= VfatLockUserBuffer(IrpContext
->Irp
, Length
, IoWriteAccess
);
739 if (NT_SUCCESS(Status
))
741 Status
= VfatMarkIrpContextForQueue(IrpContext
);
746 IrpContext
->Irp
->IoStatus
.Status
= Status
;
747 if (BooleanFlagOn(IrpContext
->FileObject
->Flags
, FO_SYNCHRONOUS_IO
) &&
749 (NT_SUCCESS(Status
) || Status
== STATUS_END_OF_FILE
))
751 IrpContext
->FileObject
->CurrentByteOffset
.QuadPart
=
752 ByteOffset
.QuadPart
+ IrpContext
->Irp
->IoStatus
.Information
;
755 if (NT_SUCCESS(Status
))
756 IrpContext
->PriorityBoost
= IO_DISK_INCREMENT
;
758 DPRINT("%x\n", Status
);
764 PVFAT_IRP_CONTEXT IrpContext
)
767 PERESOURCE Resource
= NULL
;
768 LARGE_INTEGER ByteOffset
;
769 LARGE_INTEGER OldFileSize
;
770 NTSTATUS Status
= STATUS_SUCCESS
;
773 ULONG BytesPerSector
;
774 BOOLEAN PagingIo
, CanWait
, IsVolume
, IsFAT
, NoCache
;
778 DPRINT("VfatWrite(IrpContext %p)\n", IrpContext
);
780 ASSERT(IrpContext
->DeviceObject
);
782 // This request is not allowed on the main device object
783 if (IrpContext
->DeviceObject
== VfatGlobalData
->DeviceObject
)
785 DPRINT("VfatWrite is called with the main device object.\n");
786 Status
= STATUS_INVALID_DEVICE_REQUEST
;
790 ASSERT(IrpContext
->DeviceExt
);
791 ASSERT(IrpContext
->FileObject
);
792 Fcb
= IrpContext
->FileObject
->FsContext
;
795 if (BooleanFlagOn(Fcb
->Flags
, FCB_IS_PAGE_FILE
))
797 PFATINFO FatInfo
= &IrpContext
->DeviceExt
->FatInfo
;
798 IrpContext
->Stack
->Parameters
.Write
.ByteOffset
.QuadPart
+= FatInfo
->dataStart
* FatInfo
->BytesPerSector
;
799 IoSkipCurrentIrpStackLocation(IrpContext
->Irp
);
800 IrpContext
->Flags
&= ~IRPCONTEXT_COMPLETE
;
801 DPRINT("Write to page file, disk offset %I64x\n", IrpContext
->Stack
->Parameters
.Write
.ByteOffset
.QuadPart
);
802 Status
= IoCallDriver(IrpContext
->DeviceExt
->StorageDevice
, IrpContext
->Irp
);
806 DPRINT("<%wZ>\n", &Fcb
->PathNameU
);
808 PagingIo
= BooleanFlagOn(IrpContext
->Irp
->Flags
, IRP_PAGING_IO
);
809 CanWait
= BooleanFlagOn(IrpContext
->Flags
, IRPCONTEXT_CANWAIT
);
810 IsVolume
= BooleanFlagOn(Fcb
->Flags
, FCB_IS_VOLUME
);
811 IsFAT
= BooleanFlagOn(Fcb
->Flags
, FCB_IS_FAT
);
812 NoCache
= BooleanFlagOn(IrpContext
->Irp
->Flags
, IRP_NOCACHE
);
814 /* fail if file is a directory and no paged read */
815 if (vfatFCBIsDirectory(Fcb
) && !PagingIo
)
817 Status
= STATUS_INVALID_PARAMETER
;
821 ByteOffset
= IrpContext
->Stack
->Parameters
.Write
.ByteOffset
;
822 if (ByteOffset
.u
.LowPart
== FILE_WRITE_TO_END_OF_FILE
&&
823 ByteOffset
.u
.HighPart
== -1)
825 ByteOffset
.QuadPart
= Fcb
->RFCB
.FileSize
.QuadPart
;
827 Length
= IrpContext
->Stack
->Parameters
.Write
.Length
;
828 BytesPerSector
= IrpContext
->DeviceExt
->FatInfo
.BytesPerSector
;
830 if (ByteOffset
.u
.HighPart
&& !IsVolume
)
832 Status
= STATUS_INVALID_PARAMETER
;
836 if (IsFAT
|| IsVolume
||
837 vfatDirEntryGetFirstCluster(IrpContext
->DeviceExt
, &Fcb
->entry
) == 1)
839 if (ByteOffset
.QuadPart
+ Length
> Fcb
->RFCB
.FileSize
.QuadPart
)
841 // we can't extend the FAT, the volume or the root on FAT12/FAT16
842 Status
= STATUS_END_OF_FILE
;
847 if (PagingIo
|| NoCache
|| IsVolume
)
849 if (ByteOffset
.u
.LowPart
% BytesPerSector
!= 0 || Length
% BytesPerSector
!= 0)
851 // non cached write must be sector aligned
852 Status
= STATUS_INVALID_PARAMETER
;
857 OldFileSize
= Fcb
->RFCB
.FileSize
;
861 /* Update last write time */
862 IrpContext
->Irp
->IoStatus
.Information
= 0;
863 Status
= STATUS_SUCCESS
;
869 if (ByteOffset
.u
.LowPart
+ Length
> Fcb
->RFCB
.AllocationSize
.u
.LowPart
)
871 Status
= STATUS_INVALID_PARAMETER
;
875 if (ByteOffset
.u
.LowPart
+ Length
> ROUND_UP(Fcb
->RFCB
.AllocationSize
.u
.LowPart
, BytesPerSector
))
877 Length
= ROUND_UP(Fcb
->RFCB
.FileSize
.u
.LowPart
, BytesPerSector
) - ByteOffset
.u
.LowPart
;
883 Resource
= &IrpContext
->DeviceExt
->DirResource
;
887 Resource
= &Fcb
->PagingIoResource
;
891 Resource
= &Fcb
->MainResource
;
896 if (!ExAcquireResourceSharedLite(Resource
, CanWait
))
899 Status
= STATUS_PENDING
;
905 if (!ExAcquireResourceExclusiveLite(Resource
, CanWait
))
908 Status
= STATUS_PENDING
;
914 FsRtlAreThereCurrentFileLocks(&Fcb
->FileLock
))
916 if (!FsRtlCheckLockForWriteAccess(&Fcb
->FileLock
, IrpContext
->Irp
))
918 Status
= STATUS_FILE_LOCK_CONFLICT
;
923 if (!CanWait
&& !IsVolume
)
925 if (ByteOffset
.u
.LowPart
+ Length
> Fcb
->RFCB
.AllocationSize
.u
.LowPart
)
927 Status
= STATUS_PENDING
;
932 Buffer
= VfatGetUserBuffer(IrpContext
->Irp
, PagingIo
);
934 if (!IsFAT
&& !IsVolume
&& !PagingIo
&&
935 ByteOffset
.u
.LowPart
+ Length
> Fcb
->RFCB
.FileSize
.u
.LowPart
)
937 LARGE_INTEGER AllocationSize
;
938 AllocationSize
.QuadPart
= ByteOffset
.u
.LowPart
+ Length
;
939 Status
= VfatSetAllocationSizeInformation(IrpContext
->FileObject
, Fcb
,
940 IrpContext
->DeviceExt
, &AllocationSize
);
941 if (!NT_SUCCESS (Status
))
947 if (!NoCache
&& !PagingIo
&& !IsVolume
)
953 if (IrpContext
->FileObject
->PrivateCacheMap
== NULL
)
955 CcInitializeCacheMap(IrpContext
->FileObject
,
956 (PCC_FILE_SIZES
)(&Fcb
->RFCB
.AllocationSize
),
958 &VfatGlobalData
->CacheMgrCallbacks
,
962 if (ByteOffset
.QuadPart
> OldFileSize
.QuadPart
)
964 CcZeroData(IrpContext
->FileObject
, &OldFileSize
, &ByteOffset
, TRUE
);
967 if (CcCopyWrite(IrpContext
->FileObject
,
973 IrpContext
->Irp
->IoStatus
.Information
= Length
;
974 Status
= STATUS_SUCCESS
;
978 ASSERT(FALSE
/*!CanWait*/);
979 Status
= STATUS_UNSUCCESSFUL
;
982 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER
)
984 Status
= _SEH2_GetExceptionCode();
991 Status
= VfatLockUserBuffer(IrpContext
->Irp
, Length
, IoReadAccess
);
992 if (!NT_SUCCESS(Status
))
994 Status
= STATUS_INVALID_USER_BUFFER
;
998 if (ByteOffset
.QuadPart
> OldFileSize
.QuadPart
)
1000 CcZeroData(IrpContext
->FileObject
, &OldFileSize
, &ByteOffset
, TRUE
);
1003 Status
= VfatWriteFileData(IrpContext
, Length
, ByteOffset
);
1004 if (NT_SUCCESS(Status
))
1006 IrpContext
->Irp
->IoStatus
.Information
= Length
;
1011 if (!PagingIo
&& !IsFAT
&& !IsVolume
)
1013 if(!vfatFCBIsDirectory(Fcb
))
1015 LARGE_INTEGER SystemTime
;
1018 // set dates and times
1019 KeQuerySystemTime (&SystemTime
);
1020 if (BooleanFlagOn(Fcb
->Flags
, FCB_IS_FATX_ENTRY
))
1022 FsdSystemTimeToDosDateTime(IrpContext
->DeviceExt
,
1023 &SystemTime
, &Fcb
->entry
.FatX
.UpdateDate
,
1024 &Fcb
->entry
.FatX
.UpdateTime
);
1025 Fcb
->entry
.FatX
.AccessDate
= Fcb
->entry
.FatX
.UpdateDate
;
1026 Fcb
->entry
.FatX
.AccessTime
= Fcb
->entry
.FatX
.UpdateTime
;
1030 FsdSystemTimeToDosDateTime(IrpContext
->DeviceExt
,
1031 &SystemTime
, &Fcb
->entry
.Fat
.UpdateDate
,
1032 &Fcb
->entry
.Fat
.UpdateTime
);
1033 Fcb
->entry
.Fat
.AccessDate
= Fcb
->entry
.Fat
.UpdateDate
;
1035 /* set date and times to dirty */
1036 Fcb
->Flags
|= FCB_IS_DIRTY
;
1038 /* Time to notify the OS */
1039 Filter
= FILE_NOTIFY_CHANGE_LAST_WRITE
| FILE_NOTIFY_CHANGE_ATTRIBUTES
;
1040 if (ByteOffset
.QuadPart
!= OldFileSize
.QuadPart
) Filter
|= FILE_NOTIFY_CHANGE_SIZE
;
1042 FsRtlNotifyFullReportChange(IrpContext
->DeviceExt
->NotifySync
,
1043 &(IrpContext
->DeviceExt
->NotifyList
),
1044 (PSTRING
)&Fcb
->PathNameU
,
1045 Fcb
->PathNameU
.Length
- Fcb
->LongNameU
.Length
,
1049 FILE_ACTION_MODIFIED
,
1057 ExReleaseResourceLite(Resource
);
1060 if (Status
== STATUS_PENDING
)
1062 Status
= VfatLockUserBuffer(IrpContext
->Irp
, Length
, IoReadAccess
);
1063 if (NT_SUCCESS(Status
))
1065 Status
= VfatMarkIrpContextForQueue(IrpContext
);
1070 IrpContext
->Irp
->IoStatus
.Status
= Status
;
1071 if (BooleanFlagOn(IrpContext
->FileObject
->Flags
, FO_SYNCHRONOUS_IO
) &&
1072 !PagingIo
&& NT_SUCCESS(Status
))
1074 IrpContext
->FileObject
->CurrentByteOffset
.QuadPart
=
1075 ByteOffset
.QuadPart
+ IrpContext
->Irp
->IoStatus
.Information
;
1078 if (NT_SUCCESS(Status
))
1079 IrpContext
->PriorityBoost
= IO_DISK_INCREMENT
;
1081 DPRINT("%x\n", Status
);