[NTFS] - Fix index entries storing the wrong allocated file size when the file is...
[reactos.git] / drivers / filesystems / ntfs / rw.c
1 /*
2 * ReactOS kernel
3 * Copyright (C) 2002, 2014 ReactOS Team
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
18 *
19 * COPYRIGHT: See COPYING in the top level directory
20 * PROJECT: ReactOS kernel
21 * FILE: drivers/filesystem/ntfs/rw.c
22 * PURPOSE: NTFS filesystem driver
23 * PROGRAMMERS: Art Yerkes
24 * Pierre Schweitzer (pierre@reactos.org)
25 * Trevor Thompson
26 */
27
28 /* INCLUDES *****************************************************************/
29
30 #include <ntddk.h>
31 #include "ntfs.h"
32
33 #define NDEBUG
34 #include <debug.h>
35
36 /* FUNCTIONS ****************************************************************/
37
38 /*
39 * FUNCTION: Reads data from a file
40 */
41 static
42 NTSTATUS
43 NtfsReadFile(PDEVICE_EXTENSION DeviceExt,
44 PFILE_OBJECT FileObject,
45 PUCHAR Buffer,
46 ULONG Length,
47 ULONG ReadOffset,
48 ULONG IrpFlags,
49 PULONG LengthRead)
50 {
51 NTSTATUS Status = STATUS_SUCCESS;
52 PNTFS_FCB Fcb;
53 PFILE_RECORD_HEADER FileRecord;
54 PNTFS_ATTR_CONTEXT DataContext;
55 ULONG RealLength;
56 ULONG RealReadOffset;
57 ULONG RealLengthRead;
58 ULONG ToRead;
59 BOOLEAN AllocatedBuffer = FALSE;
60 PCHAR ReadBuffer = (PCHAR)Buffer;
61 ULONGLONG StreamSize;
62
63 DPRINT1("NtfsReadFile(%p, %p, %p, %lu, %lu, %lx, %p)\n", DeviceExt, FileObject, Buffer, Length, ReadOffset, IrpFlags, LengthRead);
64
65 *LengthRead = 0;
66
67 if (Length == 0)
68 {
69 DPRINT1("Null read!\n");
70 return STATUS_SUCCESS;
71 }
72
73 Fcb = (PNTFS_FCB)FileObject->FsContext;
74
75 if (NtfsFCBIsCompressed(Fcb))
76 {
77 DPRINT1("Compressed file!\n");
78 UNIMPLEMENTED;
79 return STATUS_NOT_IMPLEMENTED;
80 }
81
82 FileRecord = ExAllocatePoolWithTag(NonPagedPool, DeviceExt->NtfsInfo.BytesPerFileRecord, TAG_NTFS);
83 if (FileRecord == NULL)
84 {
85 DPRINT1("Not enough memory!\n");
86 return STATUS_INSUFFICIENT_RESOURCES;
87 }
88
89 Status = ReadFileRecord(DeviceExt, Fcb->MFTIndex, FileRecord);
90 if (!NT_SUCCESS(Status))
91 {
92 DPRINT1("Can't find record!\n");
93 ExFreePoolWithTag(FileRecord, TAG_NTFS);
94 return Status;
95 }
96
97
98 Status = FindAttribute(DeviceExt, FileRecord, AttributeData, Fcb->Stream, wcslen(Fcb->Stream), &DataContext, NULL);
99 if (!NT_SUCCESS(Status))
100 {
101 NTSTATUS BrowseStatus;
102 FIND_ATTR_CONTXT Context;
103 PNTFS_ATTR_RECORD Attribute;
104
105 DPRINT1("No '%S' data stream associated with file!\n", Fcb->Stream);
106
107 BrowseStatus = FindFirstAttribute(&Context, DeviceExt, FileRecord, FALSE, &Attribute);
108 while (NT_SUCCESS(BrowseStatus))
109 {
110 if (Attribute->Type == AttributeData)
111 {
112 UNICODE_STRING Name;
113
114 Name.Length = Attribute->NameLength * sizeof(WCHAR);
115 Name.MaximumLength = Name.Length;
116 Name.Buffer = (PWCHAR)((ULONG_PTR)Attribute + Attribute->NameOffset);
117 DPRINT1("Data stream: '%wZ' available\n", &Name);
118 }
119
120 BrowseStatus = FindNextAttribute(&Context, &Attribute);
121 }
122 FindCloseAttribute(&Context);
123
124 ReleaseAttributeContext(DataContext);
125 ExFreePoolWithTag(FileRecord, TAG_NTFS);
126 return Status;
127 }
128
129 StreamSize = AttributeDataLength(&DataContext->Record);
130 if (ReadOffset >= StreamSize)
131 {
132 DPRINT1("Reading beyond stream end!\n");
133 ReleaseAttributeContext(DataContext);
134 ExFreePoolWithTag(FileRecord, TAG_NTFS);
135 return STATUS_END_OF_FILE;
136 }
137
138 ToRead = Length;
139 if (ReadOffset + Length > StreamSize)
140 ToRead = StreamSize - ReadOffset;
141
142 RealReadOffset = ReadOffset;
143 RealLength = ToRead;
144
145 if ((ReadOffset % DeviceExt->NtfsInfo.BytesPerSector) != 0 || (ToRead % DeviceExt->NtfsInfo.BytesPerSector) != 0)
146 {
147 RealReadOffset = ROUND_DOWN(ReadOffset, DeviceExt->NtfsInfo.BytesPerSector);
148 RealLength = ROUND_UP(ToRead, DeviceExt->NtfsInfo.BytesPerSector);
149 /* do we need to extend RealLength by one sector? */
150 if (RealLength + RealReadOffset < ReadOffset + Length)
151 {
152 if (RealReadOffset + RealLength + DeviceExt->NtfsInfo.BytesPerSector <= AttributeAllocatedLength(&DataContext->Record))
153 RealLength += DeviceExt->NtfsInfo.BytesPerSector;
154 }
155
156
157 ReadBuffer = ExAllocatePoolWithTag(NonPagedPool, RealLength, TAG_NTFS);
158 if (ReadBuffer == NULL)
159 {
160 DPRINT1("Not enough memory!\n");
161 ReleaseAttributeContext(DataContext);
162 ExFreePoolWithTag(FileRecord, TAG_NTFS);
163 return STATUS_INSUFFICIENT_RESOURCES;
164 }
165 AllocatedBuffer = TRUE;
166 }
167
168 DPRINT("Effective read: %lu at %lu for stream '%S'\n", RealLength, RealReadOffset, Fcb->Stream);
169 RealLengthRead = ReadAttribute(DeviceExt, DataContext, RealReadOffset, (PCHAR)ReadBuffer, RealLength);
170 if (RealLengthRead == 0)
171 {
172 DPRINT1("Read failure!\n");
173 ReleaseAttributeContext(DataContext);
174 ExFreePoolWithTag(FileRecord, TAG_NTFS);
175 if (AllocatedBuffer)
176 {
177 ExFreePoolWithTag(ReadBuffer, TAG_NTFS);
178 }
179 return Status;
180 }
181
182 ReleaseAttributeContext(DataContext);
183 ExFreePoolWithTag(FileRecord, TAG_NTFS);
184
185 *LengthRead = ToRead;
186
187 DPRINT("%lu got read\n", *LengthRead);
188
189 if (AllocatedBuffer)
190 {
191 RtlCopyMemory(Buffer, ReadBuffer + (ReadOffset - RealReadOffset), ToRead);
192 }
193
194 if (ToRead != Length)
195 {
196 RtlZeroMemory(Buffer + ToRead, Length - ToRead);
197 }
198
199 if (AllocatedBuffer)
200 {
201 ExFreePoolWithTag(ReadBuffer, TAG_NTFS);
202 }
203
204 return STATUS_SUCCESS;
205 }
206
207
208 NTSTATUS
209 NtfsRead(PNTFS_IRP_CONTEXT IrpContext)
210 {
211 PDEVICE_EXTENSION DeviceExt;
212 PIO_STACK_LOCATION Stack;
213 PFILE_OBJECT FileObject;
214 PVOID Buffer;
215 ULONG ReadLength;
216 LARGE_INTEGER ReadOffset;
217 ULONG ReturnedReadLength = 0;
218 NTSTATUS Status = STATUS_SUCCESS;
219 PIRP Irp;
220 PDEVICE_OBJECT DeviceObject;
221
222 DPRINT("NtfsRead(IrpContext %p)\n", IrpContext);
223
224 DeviceObject = IrpContext->DeviceObject;
225 Irp = IrpContext->Irp;
226 Stack = IrpContext->Stack;
227 FileObject = IrpContext->FileObject;
228
229 DeviceExt = DeviceObject->DeviceExtension;
230 ReadLength = Stack->Parameters.Read.Length;
231 ReadOffset = Stack->Parameters.Read.ByteOffset;
232 Buffer = NtfsGetUserBuffer(Irp, BooleanFlagOn(Irp->Flags, IRP_PAGING_IO));
233
234 Status = NtfsReadFile(DeviceExt,
235 FileObject,
236 Buffer,
237 ReadLength,
238 ReadOffset.u.LowPart,
239 Irp->Flags,
240 &ReturnedReadLength);
241 if (NT_SUCCESS(Status))
242 {
243 if (FileObject->Flags & FO_SYNCHRONOUS_IO)
244 {
245 FileObject->CurrentByteOffset.QuadPart =
246 ReadOffset.QuadPart + ReturnedReadLength;
247 }
248
249 Irp->IoStatus.Information = ReturnedReadLength;
250 }
251 else
252 {
253 Irp->IoStatus.Information = 0;
254 }
255
256 return Status;
257 }
258
259 /**
260 * @name NtfsWriteFile
261 * @implemented
262 *
263 * Writes a file to the disk. It presently borrows a lot of code from NtfsReadFile() and
264 * VFatWriteFileData(). It needs some more work before it will be complete; it won't handle
265 * page files, asnyc io, cached writes, etc.
266 *
267 * @param DeviceExt
268 * Points to the target disk's DEVICE_EXTENSION
269 *
270 * @param FileObject
271 * Pointer to a FILE_OBJECT describing the target file
272 *
273 * @param Buffer
274 * The data that's being written to the file
275 *
276 * @Param Length
277 * The size of the data buffer being written, in bytes
278 *
279 * @param WriteOffset
280 * Offset, in bytes, from the beginning of the file. Indicates where to start
281 * writing data.
282 *
283 * @param IrpFlags
284 * TODO: flags are presently ignored in code.
285 *
286 * @param CaseSensitive
287 * Boolean indicating if the function should operate in case-sensitive mode. This will be TRUE
288 * if an application opened the file with the FILE_FLAG_POSIX_SEMANTICS flag.
289 *
290 * @param LengthWritten
291 * Pointer to a ULONG. This ULONG will be set to the number of bytes successfully written.
292 *
293 * @return
294 * STATUS_SUCCESS if successful, STATUS_NOT_IMPLEMENTED if a required feature isn't implemented,
295 * STATUS_INSUFFICIENT_RESOURCES if an allocation failed, STATUS_ACCESS_DENIED if the write itself fails,
296 * STATUS_PARTIAL_COPY or STATUS_UNSUCCESSFUL if ReadFileRecord() fails, or
297 * STATUS_OBJECT_NAME_NOT_FOUND if the file's data stream could not be found.
298 *
299 * @remarks Called by NtfsWrite(). It may perform a read-modify-write operation if the requested write is
300 * not sector-aligned. LengthWritten only refers to how much of the requested data has been written;
301 * extra data that needs to be written to make the write sector-aligned will not affect it.
302 *
303 */
304 NTSTATUS NtfsWriteFile(PDEVICE_EXTENSION DeviceExt,
305 PFILE_OBJECT FileObject,
306 const PUCHAR Buffer,
307 ULONG Length,
308 ULONG WriteOffset,
309 ULONG IrpFlags,
310 BOOLEAN CaseSensitive,
311 PULONG LengthWritten)
312 {
313 NTSTATUS Status = STATUS_NOT_IMPLEMENTED;
314 PNTFS_FCB Fcb;
315 PFILE_RECORD_HEADER FileRecord;
316 PNTFS_ATTR_CONTEXT DataContext;
317 ULONG AttributeOffset;
318 ULONGLONG StreamSize;
319
320 DPRINT("NtfsWriteFile(%p, %p, %p, %lu, %lu, %x, %s, %p)\n",
321 DeviceExt,
322 FileObject,
323 Buffer,
324 Length,
325 WriteOffset,
326 IrpFlags,
327 (CaseSensitive ? "TRUE" : "FALSE"),
328 LengthWritten);
329
330 *LengthWritten = 0;
331
332 ASSERT(DeviceExt);
333
334 if (Length == 0)
335 {
336 if (Buffer == NULL)
337 return STATUS_SUCCESS;
338 else
339 return STATUS_INVALID_PARAMETER;
340 }
341
342 // get the File control block
343 Fcb = (PNTFS_FCB)FileObject->FsContext;
344 ASSERT(Fcb);
345
346 DPRINT("Fcb->PathName: %wS\n", Fcb->PathName);
347 DPRINT("Fcb->ObjectName: %wS\n", Fcb->ObjectName);
348
349 // we don't yet handle compression
350 if (NtfsFCBIsCompressed(Fcb))
351 {
352 DPRINT("Compressed file!\n");
353 UNIMPLEMENTED;
354 return STATUS_NOT_IMPLEMENTED;
355 }
356
357 // allocate non-paged memory for the FILE_RECORD_HEADER
358 FileRecord = ExAllocatePoolWithTag(NonPagedPool, DeviceExt->NtfsInfo.BytesPerFileRecord, TAG_NTFS);
359 if (FileRecord == NULL)
360 {
361 DPRINT1("Not enough memory! Can't write %wS!\n", Fcb->PathName);
362 return STATUS_INSUFFICIENT_RESOURCES;
363 }
364
365 // read the FILE_RECORD_HEADER from the drive (or cache)
366 DPRINT("Reading file record...\n");
367 Status = ReadFileRecord(DeviceExt, Fcb->MFTIndex, FileRecord);
368 if (!NT_SUCCESS(Status))
369 {
370 // We couldn't get the file's record. Free the memory and return the error
371 DPRINT1("Can't find record for %wS!\n", Fcb->ObjectName);
372 ExFreePoolWithTag(FileRecord, TAG_NTFS);
373 return Status;
374 }
375
376 DPRINT("Found record for %wS\n", Fcb->ObjectName);
377
378 // Find the attribute with the data stream for our file
379 DPRINT("Finding Data Attribute...\n");
380 Status = FindAttribute(DeviceExt, FileRecord, AttributeData, Fcb->Stream, wcslen(Fcb->Stream), &DataContext,
381 &AttributeOffset);
382
383 // Did we fail to find the attribute?
384 if (!NT_SUCCESS(Status))
385 {
386 NTSTATUS BrowseStatus;
387 FIND_ATTR_CONTXT Context;
388 PNTFS_ATTR_RECORD Attribute;
389
390 DPRINT1("No '%S' data stream associated with file!\n", Fcb->Stream);
391
392 // Couldn't find the requested data stream; print a list of streams available
393 BrowseStatus = FindFirstAttribute(&Context, DeviceExt, FileRecord, FALSE, &Attribute);
394 while (NT_SUCCESS(BrowseStatus))
395 {
396 if (Attribute->Type == AttributeData)
397 {
398 UNICODE_STRING Name;
399
400 Name.Length = Attribute->NameLength * sizeof(WCHAR);
401 Name.MaximumLength = Name.Length;
402 Name.Buffer = (PWCHAR)((ULONG_PTR)Attribute + Attribute->NameOffset);
403 DPRINT1("Data stream: '%wZ' available\n", &Name);
404 }
405
406 BrowseStatus = FindNextAttribute(&Context, &Attribute);
407 }
408 FindCloseAttribute(&Context);
409
410 ReleaseAttributeContext(DataContext);
411 ExFreePoolWithTag(FileRecord, TAG_NTFS);
412 return Status;
413 }
414
415 // Get the size of the stream on disk
416 StreamSize = AttributeDataLength(&DataContext->Record);
417
418 DPRINT("WriteOffset: %lu\tStreamSize: %I64u\n", WriteOffset, StreamSize);
419
420 // Are we trying to write beyond the end of the stream?
421 if (WriteOffset + Length > StreamSize)
422 {
423 // is increasing the stream size allowed?
424 if (!(Fcb->Flags & FCB_IS_VOLUME) &&
425 !(IrpFlags & IRP_PAGING_IO))
426 {
427 LARGE_INTEGER DataSize;
428 ULONGLONG AllocationSize;
429 PFILENAME_ATTRIBUTE fileNameAttribute;
430 ULONGLONG ParentMFTId;
431 UNICODE_STRING filename;
432
433 DataSize.QuadPart = WriteOffset + Length;
434
435 // set the attribute data length
436 Status = SetAttributeDataLength(FileObject, Fcb, DataContext, AttributeOffset, FileRecord, &DataSize);
437 if (!NT_SUCCESS(Status))
438 {
439 ReleaseAttributeContext(DataContext);
440 ExFreePoolWithTag(FileRecord, TAG_NTFS);
441 *LengthWritten = 0;
442 return Status;
443 }
444
445 AllocationSize = AttributeAllocatedLength(&DataContext->Record);
446
447 // now we need to update this file's size in every directory index entry that references it
448 // TODO: put this code in its own function and adapt it to work with every filename / hardlink
449 // stored in the file record.
450 fileNameAttribute = GetBestFileNameFromRecord(Fcb->Vcb, FileRecord);
451 ASSERT(fileNameAttribute);
452
453 ParentMFTId = fileNameAttribute->DirectoryFileReferenceNumber & NTFS_MFT_MASK;
454
455 filename.Buffer = fileNameAttribute->Name;
456 filename.Length = fileNameAttribute->NameLength * sizeof(WCHAR);
457 filename.MaximumLength = filename.Length;
458
459 Status = UpdateFileNameRecord(Fcb->Vcb,
460 ParentMFTId,
461 &filename,
462 FALSE,
463 DataSize.QuadPart,
464 AllocationSize,
465 CaseSensitive);
466
467 }
468 else
469 {
470 // TODO - just fail for now
471 ReleaseAttributeContext(DataContext);
472 ExFreePoolWithTag(FileRecord, TAG_NTFS);
473 *LengthWritten = 0;
474 return STATUS_ACCESS_DENIED;
475 }
476 }
477
478 DPRINT("Length: %lu\tWriteOffset: %lu\tStreamSize: %I64u\n", Length, WriteOffset, StreamSize);
479
480 // Write the data to the attribute
481 Status = WriteAttribute(DeviceExt, DataContext, WriteOffset, Buffer, Length, LengthWritten);
482
483 // Did the write fail?
484 if (!NT_SUCCESS(Status))
485 {
486 DPRINT1("Write failure!\n");
487 ReleaseAttributeContext(DataContext);
488 ExFreePoolWithTag(FileRecord, TAG_NTFS);
489
490 return Status;
491 }
492
493 // This should never happen:
494 if (*LengthWritten != Length)
495 {
496 DPRINT1("\a\tNTFS DRIVER ERROR: length written (%lu) differs from requested (%lu), but no error was indicated!\n",
497 *LengthWritten, Length);
498 Status = STATUS_UNEXPECTED_IO_ERROR;
499 }
500
501 ReleaseAttributeContext(DataContext);
502 ExFreePoolWithTag(FileRecord, TAG_NTFS);
503
504 return Status;
505 }
506
507 /**
508 * @name NtfsWrite
509 * @implemented
510 *
511 * Handles IRP_MJ_WRITE I/O Request Packets for NTFS. This code borrows a lot from
512 * VfatWrite, and needs a lot of cleaning up. It also needs a lot more of the code
513 * from VfatWrite integrated.
514 *
515 * @param IrpContext
516 * Points to an NTFS_IRP_CONTEXT which describes the write
517 *
518 * @return
519 * STATUS_SUCCESS if successful,
520 * STATUS_INSUFFICIENT_RESOURCES if an allocation failed,
521 * STATUS_INVALID_DEVICE_REQUEST if called on the main device object,
522 * STATUS_NOT_IMPLEMENTED or STATUS_ACCESS_DENIED if a required feature isn't implemented.
523 * STATUS_PARTIAL_COPY, STATUS_UNSUCCESSFUL, or STATUS_OBJECT_NAME_NOT_FOUND if NtfsWriteFile() fails.
524 *
525 * @remarks Called by NtfsDispatch() in response to an IRP_MJ_WRITE request. Page files are not implemented.
526 * Support for large files (>4gb) is not implemented. Cached writes, file locks, transactions, etc - not implemented.
527 *
528 */
529 NTSTATUS
530 NtfsWrite(PNTFS_IRP_CONTEXT IrpContext)
531 {
532 PNTFS_FCB Fcb;
533 PERESOURCE Resource = NULL;
534 LARGE_INTEGER ByteOffset;
535 PUCHAR Buffer;
536 NTSTATUS Status = STATUS_SUCCESS;
537 ULONG Length = 0;
538 ULONG ReturnedWriteLength = 0;
539 PDEVICE_OBJECT DeviceObject = NULL;
540 PDEVICE_EXTENSION DeviceExt = NULL;
541 PFILE_OBJECT FileObject = NULL;
542 PIRP Irp = NULL;
543 ULONG BytesPerSector;
544
545 DPRINT("NtfsWrite(IrpContext %p)\n", IrpContext);
546 ASSERT(IrpContext);
547
548 // This request is not allowed on the main device object
549 if (IrpContext->DeviceObject == NtfsGlobalData->DeviceObject)
550 {
551 DPRINT1("\t\t\t\tNtfsWrite is called with the main device object.\n");
552
553 Irp->IoStatus.Information = 0;
554 return STATUS_INVALID_DEVICE_REQUEST;
555 }
556
557 // get the I/O request packet
558 Irp = IrpContext->Irp;
559
560 // get the File control block
561 Fcb = (PNTFS_FCB)IrpContext->FileObject->FsContext;
562 ASSERT(Fcb);
563
564 DPRINT("About to write %wS\n", Fcb->ObjectName);
565 DPRINT("NTFS Version: %d.%d\n", Fcb->Vcb->NtfsInfo.MajorVersion, Fcb->Vcb->NtfsInfo.MinorVersion);
566
567 // setup some more locals
568 FileObject = IrpContext->FileObject;
569 DeviceObject = IrpContext->DeviceObject;
570 DeviceExt = DeviceObject->DeviceExtension;
571 BytesPerSector = DeviceExt->StorageDevice->SectorSize;
572 Length = IrpContext->Stack->Parameters.Write.Length;
573
574 // get the file offset we'll be writing to
575 ByteOffset = IrpContext->Stack->Parameters.Write.ByteOffset;
576 if (ByteOffset.u.LowPart == FILE_WRITE_TO_END_OF_FILE &&
577 ByteOffset.u.HighPart == -1)
578 {
579 ByteOffset.QuadPart = Fcb->RFCB.FileSize.QuadPart;
580 }
581
582 DPRINT("ByteOffset: %I64u\tLength: %lu\tBytes per sector: %lu\n", ByteOffset.QuadPart,
583 Length, BytesPerSector);
584
585 if (ByteOffset.u.HighPart && !(Fcb->Flags & FCB_IS_VOLUME))
586 {
587 // TODO: Support large files
588 DPRINT1("FIXME: Writing to large files is not yet supported at this time.\n");
589 return STATUS_INVALID_PARAMETER;
590 }
591
592 // Is this a non-cached write? A non-buffered write?
593 if (IrpContext->Irp->Flags & (IRP_PAGING_IO | IRP_NOCACHE) || (Fcb->Flags & FCB_IS_VOLUME) ||
594 IrpContext->FileObject->Flags & FILE_NO_INTERMEDIATE_BUFFERING)
595 {
596 // non-cached and non-buffered writes must be sector aligned
597 if (ByteOffset.u.LowPart % BytesPerSector != 0 || Length % BytesPerSector != 0)
598 {
599 DPRINT1("Non-cached writes and non-buffered writes must be sector aligned!\n");
600 return STATUS_INVALID_PARAMETER;
601 }
602 }
603
604 if (Length == 0)
605 {
606 DPRINT1("Null write!\n");
607
608 IrpContext->Irp->IoStatus.Information = 0;
609
610 // FIXME: Doesn't accurately detect when a user passes NULL to WriteFile() for the buffer
611 if (Irp->UserBuffer == NULL && Irp->MdlAddress == NULL)
612 {
613 // FIXME: Update last write time
614 return STATUS_SUCCESS;
615 }
616
617 return STATUS_INVALID_PARAMETER;
618 }
619
620 // get the Resource
621 if (Fcb->Flags & FCB_IS_VOLUME)
622 {
623 Resource = &DeviceExt->DirResource;
624 }
625 else if (IrpContext->Irp->Flags & IRP_PAGING_IO)
626 {
627 Resource = &Fcb->PagingIoResource;
628 }
629 else
630 {
631 Resource = &Fcb->MainResource;
632 }
633
634 // acquire exclusive access to the Resource
635 if (!ExAcquireResourceExclusiveLite(Resource, BooleanFlagOn(IrpContext->Flags, IRPCONTEXT_CANWAIT)))
636 {
637 return STATUS_CANT_WAIT;
638 }
639
640 /* From VfatWrite(). Todo: Handle file locks
641 if (!(IrpContext->Irp->Flags & IRP_PAGING_IO) &&
642 FsRtlAreThereCurrentFileLocks(&Fcb->FileLock))
643 {
644 if (!FsRtlCheckLockForWriteAccess(&Fcb->FileLock, IrpContext->Irp))
645 {
646 Status = STATUS_FILE_LOCK_CONFLICT;
647 goto ByeBye;
648 }
649 }*/
650
651 // Is this an async request to a file?
652 if (!(IrpContext->Flags & IRPCONTEXT_CANWAIT) && !(Fcb->Flags & FCB_IS_VOLUME))
653 {
654 DPRINT1("FIXME: Async writes not supported in NTFS!\n");
655
656 ExReleaseResourceLite(Resource);
657 return STATUS_NOT_IMPLEMENTED;
658 }
659
660 // get the buffer of data the user is trying to write
661 Buffer = NtfsGetUserBuffer(Irp, BooleanFlagOn(Irp->Flags, IRP_PAGING_IO));
662 ASSERT(Buffer);
663
664 // lock the buffer
665 Status = NtfsLockUserBuffer(Irp, Length, IoReadAccess);
666
667 // were we unable to lock the buffer?
668 if (!NT_SUCCESS(Status))
669 {
670 DPRINT1("Unable to lock user buffer!\n");
671
672 ExReleaseResourceLite(Resource);
673 return Status;
674 }
675
676 DPRINT("Existing File Size(Fcb->RFCB.FileSize.QuadPart): %I64u\n", Fcb->RFCB.FileSize.QuadPart);
677 DPRINT("About to write the data. Length: %lu\n", Length);
678
679 // TODO: handle HighPart of ByteOffset (large files)
680
681 // write the file
682 Status = NtfsWriteFile(DeviceExt,
683 FileObject,
684 Buffer,
685 Length,
686 ByteOffset.LowPart,
687 Irp->Flags,
688 BooleanFlagOn(IrpContext->Stack->Flags, SL_CASE_SENSITIVE),
689 &ReturnedWriteLength);
690
691 IrpContext->Irp->IoStatus.Status = Status;
692
693 // was the write successful?
694 if (NT_SUCCESS(Status))
695 {
696 // TODO: Update timestamps
697
698 if (FileObject->Flags & FO_SYNCHRONOUS_IO)
699 {
700 // advance the file pointer
701 FileObject->CurrentByteOffset.QuadPart = ByteOffset.QuadPart + ReturnedWriteLength;
702 }
703
704 IrpContext->PriorityBoost = IO_DISK_INCREMENT;
705 }
706 else
707 {
708 DPRINT1("Write not Succesful!\tReturned length: %lu\n", ReturnedWriteLength);
709 }
710
711 Irp->IoStatus.Information = ReturnedWriteLength;
712
713 // Note: We leave the user buffer that we locked alone, it's up to the I/O manager to unlock and free it
714
715 ExReleaseResourceLite(Resource);
716
717 return Status;
718 }
719
720 /* EOF */