summaryrefslogtreecommitdiffstats
path: root/FatPkg/EnhancedFatDxe/ReadWrite.c
blob: ad3c2604127434f866f85af317c95f0a4bb55fca (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
/** @file
  Functions that perform file read/write.

Copyright (c) 2005 - 2017, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available
under the terms and conditions of the BSD License which accompanies this
distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.


**/

#include "Fat.h"

/**

  Get the file's position of the file.


  @param  FHand                 - The handle of file.
  @param  Position              - The file's position of the file.

  @retval EFI_SUCCESS           - Get the info successfully.
  @retval EFI_DEVICE_ERROR      - Can not find the OFile for the file.
  @retval EFI_UNSUPPORTED       - The open file is not a file.

**/
EFI_STATUS
EFIAPI
FatGetPosition (
  IN  EFI_FILE_PROTOCOL *FHand,
  OUT UINT64            *Position
  )
{
  FAT_IFILE *IFile;
  FAT_OFILE *OFile;

  IFile = IFILE_FROM_FHAND (FHand);
  OFile = IFile->OFile;

  if (OFile->Error == EFI_NOT_FOUND) {
    return EFI_DEVICE_ERROR;
  }

  if (OFile->ODir != NULL) {
    return EFI_UNSUPPORTED;
  }

  *Position = IFile->Position;
  return EFI_SUCCESS;
}

/**

  Set the file's position of the file.

  @param  FHand                 - The handle of file.
  @param  Position              - The file's position of the file.

  @retval EFI_SUCCESS           - Set the info successfully.
  @retval EFI_DEVICE_ERROR      - Can not find the OFile for the file.
  @retval EFI_UNSUPPORTED       - Set a directory with a not-zero position.

**/
EFI_STATUS
EFIAPI
FatSetPosition (
  IN EFI_FILE_PROTOCOL  *FHand,
  IN UINT64             Position
  )
{
  FAT_IFILE *IFile;
  FAT_OFILE *OFile;

  IFile = IFILE_FROM_FHAND (FHand);
  OFile = IFile->OFile;

  if (OFile->Error == EFI_NOT_FOUND) {
    return EFI_DEVICE_ERROR;
  }

  FatWaitNonblockingTask (IFile);

  //
  // If this is a directory, we can only set back to position 0
  //
  if (OFile->ODir != NULL) {
    if (Position != 0) {
      //
      // Reset current directory cursor;
      //
      return EFI_UNSUPPORTED;
    }

    FatResetODirCursor (OFile);
  }
  //
  // Set the position
  //
  if (Position == (UINT64)-1) {
    Position = OFile->FileSize;
  }
  //
  // Set the position
  //
  IFile->Position = Position;
  return EFI_SUCCESS;
}

/**

  Get the file info from the open file of the IFile into Buffer.

  @param  IFile                 - The instance of the open file.
  @param  BufferSize            - Size of Buffer.
  @param  Buffer                - Buffer containing read data.

  @retval EFI_SUCCESS           - Get the file info successfully.
  @retval other                 - An error occurred when operation the disk.

**/
EFI_STATUS
FatIFileReadDir (
  IN     FAT_IFILE              *IFile,
  IN OUT UINTN                  *BufferSize,
     OUT VOID                   *Buffer
  )
{
  EFI_STATUS  Status;
  FAT_OFILE   *OFile;
  FAT_ODIR    *ODir;
  FAT_DIRENT  *DirEnt;
  UINT32      CurrentPos;

  OFile       = IFile->OFile;
  ODir        = OFile->ODir;
  CurrentPos  = ((UINT32) IFile->Position) / sizeof (FAT_DIRECTORY_ENTRY);

  //
  // We need to relocate the directory
  //
  if (CurrentPos < ODir->CurrentPos) {
    //
    // The directory cursor has been modified by another IFile, we reset the cursor
    //
    FatResetODirCursor (OFile);
  }
  //
  // We seek the next directory entry's position
  //
  do {
    Status = FatGetNextDirEnt (OFile, &DirEnt);
    if (EFI_ERROR (Status) || DirEnt == NULL) {
      //
      // Something error occurred or reach the end of directory,
      // return 0 buffersize
      //
      *BufferSize = 0;
      goto Done;
    }
  } while (ODir->CurrentPos <= CurrentPos);
  Status = FatGetDirEntInfo (OFile->Volume, DirEnt, BufferSize, Buffer);

Done:
  //
  // Update IFile's Position
  //
  if (!EFI_ERROR (Status)) {
    //
    // Update IFile->Position, if everything is all right
    //
    CurrentPos      = ODir->CurrentPos;
    IFile->Position = CurrentPos * sizeof (FAT_DIRECTORY_ENTRY);
  }

  return Status;
}

/**

  Get the file info from the open file of the IFile into Buffer.

  @param FHand                 - The file handle to access.
  @param  IoMode                - Indicate whether the access mode is reading or writing.
  @param  BufferSize            - Size of Buffer.
  @param  Buffer                - Buffer containing read data.
  @param  Token                 - A pointer to the token associated with the transaction.

  @retval EFI_SUCCESS           - Get the file info successfully.
  @retval EFI_DEVICE_ERROR      - Can not find the OFile for the file.
  @retval EFI_VOLUME_CORRUPTED  - The file type of open file is error.
  @retval EFI_WRITE_PROTECTED   - The disk is write protect.
  @retval EFI_ACCESS_DENIED     - The file is read-only.
  @return other                 - An error occurred when operating on the disk.

**/
EFI_STATUS
FatIFileAccess (
  IN     EFI_FILE_PROTOCOL     *FHand,
  IN     IO_MODE               IoMode,
  IN OUT UINTN                 *BufferSize,
  IN OUT VOID                  *Buffer,
  IN     EFI_FILE_IO_TOKEN     *Token
  )
{
  EFI_STATUS  Status;
  FAT_IFILE   *IFile;
  FAT_OFILE   *OFile;
  FAT_VOLUME  *Volume;
  UINT64      EndPosition;
  FAT_TASK    *Task;

  IFile  = IFILE_FROM_FHAND (FHand);
  OFile  = IFile->OFile;
  Volume = OFile->Volume;
  Task   = NULL;

  //
  // Write to a directory is unsupported
  //
  if ((OFile->ODir != NULL) && (IoMode == WriteData)) {
    return EFI_UNSUPPORTED;
  }

  if (OFile->Error == EFI_NOT_FOUND) {
    return EFI_DEVICE_ERROR;
  }

  if (IoMode == ReadData) {
    //
    // If position is at EOF, then return device error
    //
    if (IFile->Position > OFile->FileSize) {
      return EFI_DEVICE_ERROR;
    }
  } else {
    //
    // Check if the we can write data
    //
    if (Volume->ReadOnly) {
      return EFI_WRITE_PROTECTED;
    }

    if (IFile->ReadOnly) {
      return EFI_ACCESS_DENIED;
    }
  }

  if (Token == NULL) {
    FatWaitNonblockingTask (IFile);
  } else {
    //
    // Caller shouldn't call the non-blocking interfaces if the low layer doesn't support DiskIo2.
    // But if it calls, the below check can avoid crash.
    //
    if (FHand->Revision < EFI_FILE_PROTOCOL_REVISION2) {
      return EFI_UNSUPPORTED;
    }
    Task = FatCreateTask (IFile, Token);
    if (Task == NULL) {
      return EFI_OUT_OF_RESOURCES;
    }
  }

  FatAcquireLock ();

  Status = OFile->Error;
  if (!EFI_ERROR (Status)) {
    if (OFile->ODir != NULL) {
      //
      // Read a directory is supported
      //
      ASSERT (IoMode == ReadData);
      Status = FatIFileReadDir (IFile, BufferSize, Buffer);
      OFile = NULL;
    } else {
      //
      // Access a file
      //
      EndPosition = IFile->Position + *BufferSize;
      if (EndPosition > OFile->FileSize) {
        //
        // The position goes beyond the end of file
        //
        if (IoMode == ReadData) {
          //
          // Adjust the actual size read
          //
          *BufferSize -= (UINTN) EndPosition - OFile->FileSize;
        } else {
          //
          // We expand the file size of OFile
          //
          Status = FatGrowEof (OFile, EndPosition);
          if (EFI_ERROR (Status)) {
            //
            // Must update the file's info into the file's Directory Entry
            // and then flush the dirty cache info into disk.
            //
            *BufferSize = 0;
            FatOFileFlush (OFile);
            OFile = NULL;
            goto Done;
          }

          FatUpdateDirEntClusterSizeInfo (OFile);
        }
      }

      Status = FatAccessOFile (OFile, IoMode, (UINTN) IFile->Position, BufferSize, Buffer, Task);
      IFile->Position += *BufferSize;
    }
  }

  if (Token != NULL) {
    if (!EFI_ERROR (Status)) {
      Status = FatQueueTask (IFile, Task);
    } else {
      FatDestroyTask (Task);
    }
  }

Done:
  //
  // On EFI_SUCCESS case, not calling FatCleanupVolume():
  // 1) The Cache flush operation is avoided to enhance
  // performance. Caller is responsible to call Flush() when necessary.
  // 2) The volume dirty bit is probably set already, and is expected to be
  // cleaned in subsequent Flush() or other operations.
  // 3) Write operation doesn't affect OFile/IFile structure, so
  // Reference checking is not necessary.
  //
  if (EFI_ERROR (Status)) {
    Status = FatCleanupVolume (Volume, OFile, Status, NULL);
  }

  FatReleaseLock ();
  return Status;
}

/**

  Get the file info.

  @param  FHand                 - The handle of the file.
  @param  BufferSize            - Size of Buffer.
  @param  Buffer                - Buffer containing read data.


  @retval EFI_SUCCESS           - Get the file info successfully.
  @retval EFI_DEVICE_ERROR      - Can not find the OFile for the file.
  @retval EFI_VOLUME_CORRUPTED  - The file type of open file is error.
  @return other                 - An error occurred when operation the disk.

**/
EFI_STATUS
EFIAPI
FatRead (
  IN     EFI_FILE_PROTOCOL  *FHand,
  IN OUT UINTN              *BufferSize,
     OUT VOID               *Buffer
  )
{
  return FatIFileAccess (FHand, ReadData, BufferSize, Buffer, NULL);
}

/**

  Get the file info.

  @param  FHand                 - The handle of the file.
  @param  Token                 - A pointer to the token associated with the transaction.

  @retval EFI_SUCCESS           - Get the file info successfully.
  @retval EFI_DEVICE_ERROR      - Can not find the OFile for the file.
  @retval EFI_VOLUME_CORRUPTED  - The file type of open file is error.
  @return other                 - An error occurred when operation the disk.

**/
EFI_STATUS
EFIAPI
FatReadEx (
  IN     EFI_FILE_PROTOCOL  *FHand,
  IN OUT EFI_FILE_IO_TOKEN  *Token
  )
{
  return FatIFileAccess (FHand, ReadData, &Token->BufferSize, Token->Buffer, Token);
}

/**

  Write the content of buffer into files.

  @param  FHand                 - The handle of the file.
  @param  BufferSize            - Size of Buffer.
  @param  Buffer                - Buffer containing write data.

  @retval EFI_SUCCESS           - Set the file info successfully.
  @retval EFI_WRITE_PROTECTED   - The disk is write protect.
  @retval EFI_ACCESS_DENIED     - The file is read-only.
  @retval EFI_DEVICE_ERROR      - The OFile is not valid.
  @retval EFI_UNSUPPORTED       - The open file is not a file.
                        - The writing file size is larger than 4GB.
  @return other                 - An error occurred when operation the disk.

**/
EFI_STATUS
EFIAPI
FatWrite (
  IN     EFI_FILE_PROTOCOL  *FHand,
  IN OUT UINTN              *BufferSize,
  IN     VOID               *Buffer
  )
{
  return FatIFileAccess (FHand, WriteData, BufferSize, Buffer, NULL);
}

/**

  Get the file info.

  @param  FHand                 - The handle of the file.
  @param  Token                 - A pointer to the token associated with the transaction.

  @retval EFI_SUCCESS           - Get the file info successfully.
  @retval EFI_DEVICE_ERROR      - Can not find the OFile for the file.
  @retval EFI_VOLUME_CORRUPTED  - The file type of open file is error.
  @return other                 - An error occurred when operation the disk.

**/
EFI_STATUS
EFIAPI
FatWriteEx (
  IN     EFI_FILE_PROTOCOL  *FHand,
  IN OUT EFI_FILE_IO_TOKEN  *Token
  )
{
  return FatIFileAccess (FHand, WriteData, &Token->BufferSize, Token->Buffer, Token);
}

/**

  This function reads data from a file or writes data to a file.
  It uses OFile->PosRem to determine how much data can be accessed in one time.

  @param  OFile                 - The open file.
  @param  IoMode                - Indicate whether the access mode is reading or writing.
  @param  Position              - The position where data will be accessed.
  @param  DataBufferSize        - Size of Buffer.
  @param  UserBuffer            - Buffer containing data.
  @param  Task                    point to task instance.

  @retval EFI_SUCCESS           - Access the data successfully.
  @return other                 - An error occurred when operating on the disk.

**/
EFI_STATUS
FatAccessOFile (
  IN     FAT_OFILE      *OFile,
  IN     IO_MODE        IoMode,
  IN     UINTN          Position,
  IN OUT UINTN          *DataBufferSize,
  IN OUT UINT8          *UserBuffer,
  IN FAT_TASK           *Task
  )
{
  FAT_VOLUME  *Volume;
  UINTN       Len;
  EFI_STATUS  Status;
  UINTN       BufferSize;

  BufferSize  = *DataBufferSize;
  Volume      = OFile->Volume;
  ASSERT_VOLUME_LOCKED (Volume);

  Status = EFI_SUCCESS;
  while (BufferSize > 0) {
    //
    // Seek the OFile to the file position
    //
    Status = FatOFilePosition (OFile, Position, BufferSize);
    if (EFI_ERROR (Status)) {
      break;
    }
    //
    // Clip length to block run
    //
    Len = BufferSize > OFile->PosRem ? OFile->PosRem : BufferSize;

    //
    // Write the data
    //
    Status = FatDiskIo (Volume, IoMode, OFile->PosDisk, Len, UserBuffer, Task);
    if (EFI_ERROR (Status)) {
      break;
    }
    //
    // Data was successfully accessed
    //
    Position   += Len;
    UserBuffer += Len;
    BufferSize -= Len;
    if (IoMode == WriteData) {
      OFile->Dirty    = TRUE;
      OFile->Archive  = TRUE;
    }
    //
    // Make sure no outbound occurred
    //
    ASSERT (Position <= OFile->FileSize);
  }
  //
  // Update the number of bytes accessed
  //
  *DataBufferSize -= BufferSize;
  return Status;
}

/**

  Expand OFile by appending zero bytes at the end of OFile.

  @param  OFile                 - The open file.
  @param  ExpandedSize          - The number of zero bytes appended at the end of the file.

  @retval EFI_SUCCESS           - The file is expanded successfully.
  @return other                 - An error occurred when expanding file.

**/
EFI_STATUS
FatExpandOFile (
  IN FAT_OFILE          *OFile,
  IN UINT64             ExpandedSize
  )
{
  EFI_STATUS  Status;
  UINTN       WritePos;

  WritePos  = OFile->FileSize;
  Status    = FatGrowEof (OFile, ExpandedSize);
  if (!EFI_ERROR (Status)) {
    Status = FatWriteZeroPool (OFile, WritePos);
  }

  return Status;
}

/**

  Write zero pool from the WritePos to the end of OFile.

  @param  OFile                 - The open file to write zero pool.
  @param  WritePos              - The number of zero bytes written.

  @retval EFI_SUCCESS           - Write the zero pool successfully.
  @retval EFI_OUT_OF_RESOURCES  - Not enough memory to perform the operation.
  @return other                 - An error occurred when writing disk.

**/
EFI_STATUS
FatWriteZeroPool (
  IN FAT_OFILE  *OFile,
  IN UINTN      WritePos
  )
{
  EFI_STATUS  Status;
  VOID        *ZeroBuffer;
  UINTN       AppendedSize;
  UINTN       BufferSize;
  UINTN       WriteSize;

  AppendedSize  = OFile->FileSize - WritePos;
  BufferSize    = AppendedSize;
  if (AppendedSize > FAT_MAX_ALLOCATE_SIZE) {
    //
    // If the appended size is larger, maybe we can not allocate the whole
    // memory once. So if the growed size is larger than 10M, we just
    // allocate 10M memory (one healthy system should have 10M available
    // memory), and then write the zerobuffer to the file several times.
    //
    BufferSize = FAT_MAX_ALLOCATE_SIZE;
  }

  ZeroBuffer = AllocateZeroPool (BufferSize);
  if (ZeroBuffer == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  do {
    WriteSize     = AppendedSize > BufferSize ? BufferSize : (UINTN) AppendedSize;
    AppendedSize -= WriteSize;
    Status = FatAccessOFile (OFile, WriteData, WritePos, &WriteSize, ZeroBuffer, NULL);
    if (EFI_ERROR (Status)) {
      break;
    }

    WritePos += WriteSize;
  } while (AppendedSize > 0);

  FreePool (ZeroBuffer);
  return Status;
}

/**

  Truncate the OFile to smaller file size.

  @param  OFile                 - The open file.
  @param  TruncatedSize         - The new file size.

  @retval EFI_SUCCESS           - The file is truncated successfully.
  @return other                 - An error occurred when truncating file.

**/
EFI_STATUS
FatTruncateOFile (
  IN FAT_OFILE          *OFile,
  IN UINTN              TruncatedSize
  )
{
  OFile->FileSize = TruncatedSize;
  return FatShrinkEof (OFile);
}