]>
Commit | Line | Data |
---|---|---|
8aafec2c PA |
1 | /** @file\r |
2 | Scan for an UDF file system on a formatted media.\r | |
3 | \r | |
4 | Copyright (C) 2014-2017 Paulo Alcantara <pcacjr@zytor.com>\r | |
5 | \r | |
6 | This program and the accompanying materials are licensed and made available\r | |
7 | under the terms and conditions of the BSD License which accompanies this\r | |
8 | distribution. The full text of the license may be found at\r | |
9 | http://opensource.org/licenses/bsd-license.php\r | |
10 | \r | |
11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT\r | |
12 | WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
13 | **/\r | |
14 | \r | |
15 | #include "Partition.h"\r | |
16 | \r | |
1fbe8276 PA |
17 | #define MAX_CORRECTION_BLOCKS_NUM 512u\r |
18 | \r | |
8aafec2c PA |
19 | //\r |
20 | // C5BD4D42-1A76-4996-8956-73CDA326CD0A\r | |
21 | //\r | |
22 | #define EFI_UDF_DEVICE_PATH_GUID \\r | |
23 | { 0xC5BD4D42, 0x1A76, 0x4996, \\r | |
24 | { 0x89, 0x56, 0x73, 0xCD, 0xA3, 0x26, 0xCD, 0x0A } \\r | |
25 | }\r | |
26 | \r | |
27 | typedef struct {\r | |
28 | VENDOR_DEVICE_PATH DevicePath;\r | |
29 | EFI_DEVICE_PATH_PROTOCOL End;\r | |
30 | } UDF_DEVICE_PATH;\r | |
31 | \r | |
3f92b104 HW |
32 | //\r |
33 | // Vendor-Defined Device Path GUID for UDF file system\r | |
34 | //\r | |
35 | EFI_GUID gUdfDevPathGuid = EFI_UDF_DEVICE_PATH_GUID;\r | |
36 | \r | |
8aafec2c PA |
37 | //\r |
38 | // Vendor-Defined Media Device Path for UDF file system\r | |
39 | //\r | |
40 | UDF_DEVICE_PATH gUdfDevicePath = {\r | |
41 | { { MEDIA_DEVICE_PATH, MEDIA_VENDOR_DP,\r | |
42 | { sizeof (VENDOR_DEVICE_PATH), 0 } },\r | |
43 | EFI_UDF_DEVICE_PATH_GUID\r | |
44 | },\r | |
45 | { END_DEVICE_PATH_TYPE, END_ENTIRE_DEVICE_PATH_SUBTYPE,\r | |
46 | { sizeof (EFI_DEVICE_PATH_PROTOCOL), 0 }\r | |
47 | }\r | |
48 | };\r | |
49 | \r | |
077f8c43 HW |
50 | /**\r |
51 | Find the anchor volume descriptor pointer.\r | |
52 | \r | |
1fbe8276 PA |
53 | @param[in] BlockIo BlockIo interface.\r |
54 | @param[in] DiskIo DiskIo interface.\r | |
55 | @param[out] AnchorPoint Anchor volume descriptor pointer.\r | |
56 | @param[out] LastRecordedBlock Last recorded block.\r | |
077f8c43 | 57 | \r |
1fbe8276 PA |
58 | @retval EFI_SUCCESS Anchor volume descriptor pointer found.\r |
59 | @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.\r | |
60 | @retval other Anchor volume descriptor pointer not found.\r | |
077f8c43 HW |
61 | \r |
62 | **/\r | |
8aafec2c PA |
63 | EFI_STATUS\r |
64 | FindAnchorVolumeDescriptorPointer (\r | |
65 | IN EFI_BLOCK_IO_PROTOCOL *BlockIo,\r | |
66 | IN EFI_DISK_IO_PROTOCOL *DiskIo,\r | |
1fbe8276 PA |
67 | OUT UDF_ANCHOR_VOLUME_DESCRIPTOR_POINTER *AnchorPoint,\r |
68 | OUT EFI_LBA *LastRecordedBlock\r | |
8aafec2c PA |
69 | )\r |
70 | {\r | |
1fbe8276 PA |
71 | EFI_STATUS Status;\r |
72 | UINT32 BlockSize;\r | |
73 | EFI_LBA EndLBA;\r | |
74 | UDF_DESCRIPTOR_TAG *DescriptorTag;\r | |
75 | UINTN AvdpsCount;\r | |
76 | UINTN Size;\r | |
77 | UDF_ANCHOR_VOLUME_DESCRIPTOR_POINTER *AnchorPoints;\r | |
78 | INTN Index;\r | |
79 | UDF_ANCHOR_VOLUME_DESCRIPTOR_POINTER *AnchorPointPtr;\r | |
80 | EFI_LBA LastAvdpBlockNum;\r | |
8aafec2c | 81 | \r |
1fbe8276 PA |
82 | //\r |
83 | // UDF 2.60, 2.2.3 Anchor Volume Descriptor Pointer\r | |
84 | //\r | |
85 | // An Anchor Volume Descriptor Pointer structure shall be recorded in at\r | |
86 | // least 2 of the following 3 locations on the media: Logical Sector 256,\r | |
87 | // N - 256 or N, where N is the last *addressable* sector of a volume.\r | |
88 | //\r | |
89 | // To figure out what logical sector N is, the SCSI commands READ CAPACITY and\r | |
90 | // READ TRACK INFORMATION are used, however many drives or medias report their\r | |
91 | // "last recorded block" wrongly. Although, READ CAPACITY returns the last\r | |
92 | // readable data block but there might be unwritten blocks, which are located\r | |
93 | // outside any track and therefore AVDP will not be found at block N.\r | |
94 | //\r | |
95 | // That said, we define a magic number of 512 blocks to be used as correction\r | |
96 | // when attempting to find AVDP and define last block number.\r | |
97 | //\r | |
c05cae55 DB |
98 | BlockSize = BlockIo->Media->BlockSize;\r |
99 | EndLBA = BlockIo->Media->LastBlock;\r | |
1fbe8276 PA |
100 | *LastRecordedBlock = EndLBA;\r |
101 | AvdpsCount = 0;\r | |
c05cae55 | 102 | \r |
1fbe8276 PA |
103 | //\r |
104 | // Find AVDP at block 256\r | |
105 | //\r | |
106 | Status = DiskIo->ReadDisk (\r | |
107 | DiskIo,\r | |
108 | BlockIo->Media->MediaId,\r | |
109 | MultU64x32 (256, BlockSize),\r | |
110 | sizeof (*AnchorPoint),\r | |
111 | AnchorPoint\r | |
112 | );\r | |
113 | if (EFI_ERROR (Status)) {\r | |
114 | return Status;\r | |
115 | }\r | |
116 | \r | |
117 | DescriptorTag = &AnchorPoint->DescriptorTag;\r | |
118 | \r | |
119 | //\r | |
120 | // Check if read block is a valid AVDP descriptor\r | |
121 | //\r | |
122 | if (DescriptorTag->TagIdentifier == UdfAnchorVolumeDescriptorPointer) {\r | |
123 | DEBUG ((DEBUG_INFO, "%a: found AVDP at block %d\n", __FUNCTION__, 256));\r | |
124 | AvdpsCount++;\r | |
125 | }\r | |
126 | \r | |
127 | //\r | |
128 | // Find AVDP at block N - 256\r | |
129 | //\r | |
130 | Status = DiskIo->ReadDisk (\r | |
131 | DiskIo,\r | |
132 | BlockIo->Media->MediaId,\r | |
133 | MultU64x32 ((UINT64)EndLBA - 256, BlockSize),\r | |
134 | sizeof (*AnchorPoint),\r | |
135 | AnchorPoint\r | |
136 | );\r | |
137 | if (EFI_ERROR (Status)) {\r | |
138 | return Status;\r | |
139 | }\r | |
140 | \r | |
141 | //\r | |
142 | // Check if read block is a valid AVDP descriptor\r | |
143 | //\r | |
144 | if (DescriptorTag->TagIdentifier == UdfAnchorVolumeDescriptorPointer &&\r | |
145 | ++AvdpsCount == 2) {\r | |
146 | DEBUG ((DEBUG_INFO, "%a: found AVDP at block %Ld\n", __FUNCTION__,\r | |
147 | EndLBA - 256));\r | |
148 | return EFI_SUCCESS;\r | |
149 | }\r | |
150 | \r | |
151 | //\r | |
152 | // Check if at least one AVDP was found in previous locations\r | |
153 | //\r | |
154 | if (AvdpsCount == 0) {\r | |
155 | return EFI_VOLUME_CORRUPTED;\r | |
156 | }\r | |
157 | \r | |
158 | //\r | |
159 | // Find AVDP at block N\r | |
160 | //\r | |
161 | Status = DiskIo->ReadDisk (\r | |
162 | DiskIo,\r | |
163 | BlockIo->Media->MediaId,\r | |
164 | MultU64x32 ((UINT64)EndLBA, BlockSize),\r | |
165 | sizeof (*AnchorPoint),\r | |
166 | AnchorPoint\r | |
167 | );\r | |
168 | if (EFI_ERROR (Status)) {\r | |
169 | return Status;\r | |
170 | }\r | |
171 | \r | |
172 | //\r | |
173 | // Check if read block is a valid AVDP descriptor\r | |
174 | //\r | |
175 | if (DescriptorTag->TagIdentifier == UdfAnchorVolumeDescriptorPointer) {\r | |
176 | return EFI_SUCCESS;\r | |
177 | }\r | |
178 | \r | |
179 | //\r | |
180 | // No AVDP found at block N. Possibly drive/media returned bad last recorded\r | |
181 | // block, or it is part of unwritten data blocks and outside any track.\r | |
182 | //\r | |
183 | // Search backwards for an AVDP from block N-1 through\r | |
184 | // N-MAX_CORRECTION_BLOCKS_NUM. If any AVDP is found, then correct last block\r | |
185 | // number for the new UDF partition child handle.\r | |
186 | //\r | |
187 | Size = MAX_CORRECTION_BLOCKS_NUM * BlockSize;\r | |
188 | \r | |
189 | AnchorPoints = AllocateZeroPool (Size);\r | |
190 | if (AnchorPoints == NULL) {\r | |
191 | return EFI_OUT_OF_RESOURCES;\r | |
192 | }\r | |
193 | \r | |
194 | //\r | |
195 | // Read consecutive MAX_CORRECTION_BLOCKS_NUM disk blocks\r | |
196 | //\r | |
197 | Status = DiskIo->ReadDisk (\r | |
198 | DiskIo,\r | |
199 | BlockIo->Media->MediaId,\r | |
200 | MultU64x32 ((UINT64)EndLBA - MAX_CORRECTION_BLOCKS_NUM, BlockSize),\r | |
201 | Size,\r | |
202 | AnchorPoints\r | |
203 | );\r | |
204 | if (EFI_ERROR (Status)) {\r | |
205 | goto Out_Free;\r | |
206 | }\r | |
baaa3cee | 207 | \r |
1fbe8276 PA |
208 | Status = EFI_VOLUME_CORRUPTED;\r |
209 | \r | |
210 | //\r | |
211 | // Search for AVDP from blocks N-1 through N-MAX_CORRECTION_BLOCKS_NUM\r | |
212 | //\r | |
213 | for (Index = MAX_CORRECTION_BLOCKS_NUM - 2; Index >= 0; Index--) {\r | |
214 | AnchorPointPtr = (VOID *)((UINTN)AnchorPoints + Index * BlockSize);\r | |
215 | \r | |
216 | DescriptorTag = &AnchorPointPtr->DescriptorTag;\r | |
baaa3cee | 217 | \r |
8aafec2c | 218 | //\r |
1fbe8276 | 219 | // Check if read block is a valid AVDP descriptor\r |
8aafec2c | 220 | //\r |
baaa3cee | 221 | if (DescriptorTag->TagIdentifier == UdfAnchorVolumeDescriptorPointer) {\r |
1fbe8276 PA |
222 | //\r |
223 | // Calculate last recorded block number\r | |
224 | //\r | |
225 | LastAvdpBlockNum = EndLBA - (MAX_CORRECTION_BLOCKS_NUM - Index);\r | |
226 | DEBUG ((DEBUG_WARN, "%a: found AVDP at block %Ld\n", __FUNCTION__,\r | |
227 | LastAvdpBlockNum));\r | |
228 | DEBUG ((DEBUG_WARN, "%a: correcting last block from %Ld to %Ld\n",\r | |
229 | __FUNCTION__, EndLBA, LastAvdpBlockNum));\r | |
230 | //\r | |
231 | // Save read AVDP from last block\r | |
232 | //\r | |
233 | CopyMem (AnchorPoint, AnchorPointPtr, sizeof (*AnchorPointPtr));\r | |
234 | //\r | |
235 | // Set last recorded block number\r | |
236 | //\r | |
237 | *LastRecordedBlock = LastAvdpBlockNum;\r | |
238 | Status = EFI_SUCCESS;\r | |
239 | break;\r | |
8aafec2c PA |
240 | }\r |
241 | }\r | |
1fbe8276 PA |
242 | \r |
243 | Out_Free:\r | |
244 | FreePool (AnchorPoints);\r | |
245 | return Status;\r | |
8aafec2c PA |
246 | }\r |
247 | \r | |
248 | /**\r | |
baaa3cee | 249 | Find UDF volume identifiers in a Volume Recognition Sequence.\r |
8aafec2c | 250 | \r |
baaa3cee PA |
251 | @param[in] BlockIo BlockIo interface.\r |
252 | @param[in] DiskIo DiskIo interface.\r | |
8aafec2c | 253 | \r |
baaa3cee PA |
254 | @retval EFI_SUCCESS UDF volume identifiers were found.\r |
255 | @retval EFI_NOT_FOUND UDF volume identifiers were not found.\r | |
256 | @retval other Failed to perform disk I/O.\r | |
8aafec2c PA |
257 | \r |
258 | **/\r | |
259 | EFI_STATUS\r | |
baaa3cee | 260 | FindUdfVolumeIdentifiers (\r |
8aafec2c PA |
261 | IN EFI_BLOCK_IO_PROTOCOL *BlockIo,\r |
262 | IN EFI_DISK_IO_PROTOCOL *DiskIo\r | |
263 | )\r | |
264 | {\r | |
265 | EFI_STATUS Status;\r | |
266 | UINT64 Offset;\r | |
267 | UINT64 EndDiskOffset;\r | |
268 | CDROM_VOLUME_DESCRIPTOR VolDescriptor;\r | |
269 | CDROM_VOLUME_DESCRIPTOR TerminatingVolDescriptor;\r | |
8aafec2c PA |
270 | \r |
271 | ZeroMem ((VOID *)&TerminatingVolDescriptor, sizeof (CDROM_VOLUME_DESCRIPTOR));\r | |
272 | \r | |
273 | //\r | |
274 | // Start Volume Recognition Sequence\r | |
275 | //\r | |
276 | EndDiskOffset = MultU64x32 (BlockIo->Media->LastBlock,\r | |
277 | BlockIo->Media->BlockSize);\r | |
278 | \r | |
279 | for (Offset = UDF_VRS_START_OFFSET; Offset < EndDiskOffset;\r | |
280 | Offset += UDF_LOGICAL_SECTOR_SIZE) {\r | |
281 | //\r | |
282 | // Check if block device has a Volume Structure Descriptor and an Extended\r | |
283 | // Area.\r | |
284 | //\r | |
285 | Status = DiskIo->ReadDisk (\r | |
286 | DiskIo,\r | |
287 | BlockIo->Media->MediaId,\r | |
288 | Offset,\r | |
289 | sizeof (CDROM_VOLUME_DESCRIPTOR),\r | |
290 | (VOID *)&VolDescriptor\r | |
291 | );\r | |
292 | if (EFI_ERROR (Status)) {\r | |
293 | return Status;\r | |
294 | }\r | |
295 | \r | |
296 | if (CompareMem ((VOID *)VolDescriptor.Unknown.Id,\r | |
297 | (VOID *)UDF_BEA_IDENTIFIER,\r | |
298 | sizeof (VolDescriptor.Unknown.Id)) == 0) {\r | |
299 | break;\r | |
300 | }\r | |
301 | \r | |
302 | if ((CompareMem ((VOID *)VolDescriptor.Unknown.Id,\r | |
303 | (VOID *)CDVOL_ID,\r | |
304 | sizeof (VolDescriptor.Unknown.Id)) != 0) ||\r | |
305 | (CompareMem ((VOID *)&VolDescriptor,\r | |
306 | (VOID *)&TerminatingVolDescriptor,\r | |
307 | sizeof (CDROM_VOLUME_DESCRIPTOR)) == 0)) {\r | |
baaa3cee | 308 | return EFI_NOT_FOUND;\r |
8aafec2c PA |
309 | }\r |
310 | }\r | |
311 | \r | |
312 | //\r | |
313 | // Look for "NSR0{2,3}" identifiers in the Extended Area.\r | |
314 | //\r | |
315 | Offset += UDF_LOGICAL_SECTOR_SIZE;\r | |
316 | if (Offset >= EndDiskOffset) {\r | |
baaa3cee | 317 | return EFI_NOT_FOUND;\r |
8aafec2c PA |
318 | }\r |
319 | \r | |
320 | Status = DiskIo->ReadDisk (\r | |
321 | DiskIo,\r | |
322 | BlockIo->Media->MediaId,\r | |
323 | Offset,\r | |
324 | sizeof (CDROM_VOLUME_DESCRIPTOR),\r | |
325 | (VOID *)&VolDescriptor\r | |
326 | );\r | |
327 | if (EFI_ERROR (Status)) {\r | |
328 | return Status;\r | |
329 | }\r | |
330 | \r | |
331 | if ((CompareMem ((VOID *)VolDescriptor.Unknown.Id,\r | |
332 | (VOID *)UDF_NSR2_IDENTIFIER,\r | |
333 | sizeof (VolDescriptor.Unknown.Id)) != 0) &&\r | |
334 | (CompareMem ((VOID *)VolDescriptor.Unknown.Id,\r | |
335 | (VOID *)UDF_NSR3_IDENTIFIER,\r | |
336 | sizeof (VolDescriptor.Unknown.Id)) != 0)) {\r | |
baaa3cee | 337 | return EFI_NOT_FOUND;\r |
8aafec2c PA |
338 | }\r |
339 | \r | |
340 | //\r | |
341 | // Look for "TEA01" identifier in the Extended Area\r | |
342 | //\r | |
343 | Offset += UDF_LOGICAL_SECTOR_SIZE;\r | |
344 | if (Offset >= EndDiskOffset) {\r | |
baaa3cee | 345 | return EFI_NOT_FOUND;\r |
8aafec2c PA |
346 | }\r |
347 | \r | |
348 | Status = DiskIo->ReadDisk (\r | |
349 | DiskIo,\r | |
350 | BlockIo->Media->MediaId,\r | |
351 | Offset,\r | |
352 | sizeof (CDROM_VOLUME_DESCRIPTOR),\r | |
353 | (VOID *)&VolDescriptor\r | |
354 | );\r | |
355 | if (EFI_ERROR (Status)) {\r | |
356 | return Status;\r | |
357 | }\r | |
358 | \r | |
359 | if (CompareMem ((VOID *)VolDescriptor.Unknown.Id,\r | |
360 | (VOID *)UDF_TEA_IDENTIFIER,\r | |
361 | sizeof (VolDescriptor.Unknown.Id)) != 0) {\r | |
baaa3cee PA |
362 | return EFI_NOT_FOUND;\r |
363 | }\r | |
364 | \r | |
365 | return EFI_SUCCESS;\r | |
366 | }\r | |
367 | \r | |
368 | /**\r | |
369 | Check if Logical Volume Descriptor is supported by current EDK2 UDF file\r | |
370 | system implementation.\r | |
371 | \r | |
372 | @param[in] LogicalVolDesc Logical Volume Descriptor pointer.\r | |
373 | \r | |
374 | @retval TRUE Logical Volume Descriptor is supported.\r | |
375 | @retval FALSE Logical Volume Descriptor is not supported.\r | |
376 | \r | |
377 | **/\r | |
378 | BOOLEAN\r | |
379 | IsLogicalVolumeDescriptorSupported (\r | |
380 | UDF_LOGICAL_VOLUME_DESCRIPTOR *LogicalVolDesc\r | |
381 | )\r | |
382 | {\r | |
383 | //\r | |
384 | // Check for a valid UDF revision range\r | |
385 | //\r | |
386 | switch (LogicalVolDesc->DomainIdentifier.Suffix.Domain.UdfRevision) {\r | |
387 | case 0x0102:\r | |
388 | case 0x0150:\r | |
389 | case 0x0200:\r | |
390 | case 0x0201:\r | |
391 | case 0x0250:\r | |
392 | case 0x0260:\r | |
393 | break;\r | |
394 | default:\r | |
395 | return FALSE;\r | |
396 | }\r | |
397 | \r | |
398 | //\r | |
399 | // Check for a single Partition Map\r | |
400 | //\r | |
401 | if (LogicalVolDesc->NumberOfPartitionMaps > 1) {\r | |
402 | return FALSE;\r | |
403 | }\r | |
404 | //\r | |
405 | // UDF 1.02 revision supports only Type 1 (Physical) partitions, but\r | |
406 | // let's check it any way.\r | |
407 | //\r | |
408 | // PartitionMap[0] -> type\r | |
409 | // PartitionMap[1] -> length (in bytes)\r | |
410 | //\r | |
411 | if (LogicalVolDesc->PartitionMaps[0] != 1 ||\r | |
412 | LogicalVolDesc->PartitionMaps[1] != 6) {\r | |
413 | return FALSE;\r | |
414 | }\r | |
415 | \r | |
416 | return TRUE;\r | |
417 | }\r | |
418 | \r | |
419 | /**\r | |
420 | Find UDF logical volume location and whether it is supported by current EDK2\r | |
421 | UDF file system implementation.\r | |
422 | \r | |
1fbe8276 PA |
423 | @param[in] BlockIo BlockIo interface.\r |
424 | @param[in] DiskIo DiskIo interface.\r | |
425 | @param[in] AnchorPoint Anchor volume descriptor pointer.\r | |
426 | @param[in] LastRecordedBlock Last recorded block in media.\r | |
427 | @param[out] MainVdsStartBlock Main VDS starting block number.\r | |
428 | @param[out] MainVdsEndBlock Main VDS ending block number.\r | |
baaa3cee | 429 | \r |
1fbe8276 PA |
430 | @retval EFI_SUCCESS UDF logical volume was found.\r |
431 | @retval EFI_VOLUME_CORRUPTED UDF file system structures are corrupted.\r | |
432 | @retval EFI_UNSUPPORTED UDF logical volume is not supported.\r | |
433 | @retval other Failed to perform disk I/O.\r | |
baaa3cee PA |
434 | \r |
435 | **/\r | |
436 | EFI_STATUS\r | |
437 | FindLogicalVolumeLocation (\r | |
438 | IN EFI_BLOCK_IO_PROTOCOL *BlockIo,\r | |
439 | IN EFI_DISK_IO_PROTOCOL *DiskIo,\r | |
440 | IN UDF_ANCHOR_VOLUME_DESCRIPTOR_POINTER *AnchorPoint,\r | |
1fbe8276 | 441 | IN EFI_LBA LastRecordedBlock,\r |
baaa3cee PA |
442 | OUT UINT64 *MainVdsStartBlock,\r |
443 | OUT UINT64 *MainVdsEndBlock\r | |
444 | )\r | |
445 | {\r | |
446 | EFI_STATUS Status;\r | |
447 | UINT32 BlockSize;\r | |
baaa3cee PA |
448 | UDF_EXTENT_AD *ExtentAd;\r |
449 | UINT64 SeqBlocksNum;\r | |
450 | UINT64 SeqStartBlock;\r | |
451 | UINT64 GuardMainVdsStartBlock;\r | |
452 | VOID *Buffer;\r | |
453 | UINT64 SeqEndBlock;\r | |
454 | BOOLEAN StopSequence;\r | |
455 | UINTN LvdsCount;\r | |
456 | UDF_LOGICAL_VOLUME_DESCRIPTOR *LogicalVolDesc;\r | |
457 | UDF_DESCRIPTOR_TAG *DescriptorTag;\r | |
458 | \r | |
459 | BlockSize = BlockIo->Media->BlockSize;\r | |
baaa3cee PA |
460 | ExtentAd = &AnchorPoint->MainVolumeDescriptorSequenceExtent;\r |
461 | \r | |
462 | //\r | |
463 | // UDF 2.60, 2.2.3.1 struct MainVolumeDescriptorSequenceExtent\r | |
464 | //\r | |
465 | // The Main Volume Descriptor Sequence Extent shall have a minimum length of\r | |
466 | // 16 logical sectors.\r | |
467 | //\r | |
468 | // Also make sure it does not exceed maximum number of blocks in the disk.\r | |
469 | //\r | |
470 | SeqBlocksNum = DivU64x32 ((UINT64)ExtentAd->ExtentLength, BlockSize);\r | |
1fbe8276 | 471 | if (SeqBlocksNum < 16 || (EFI_LBA)SeqBlocksNum > LastRecordedBlock + 1) {\r |
baaa3cee PA |
472 | return EFI_VOLUME_CORRUPTED;\r |
473 | }\r | |
474 | \r | |
475 | //\r | |
476 | // Check for valid Volume Descriptor Sequence starting block number\r | |
477 | //\r | |
478 | SeqStartBlock = (UINT64)ExtentAd->ExtentLocation;\r | |
1fbe8276 PA |
479 | if (SeqStartBlock > LastRecordedBlock ||\r |
480 | SeqStartBlock + SeqBlocksNum - 1 > LastRecordedBlock) {\r | |
baaa3cee PA |
481 | return EFI_VOLUME_CORRUPTED;\r |
482 | }\r | |
483 | \r | |
484 | GuardMainVdsStartBlock = SeqStartBlock;\r | |
485 | \r | |
486 | //\r | |
487 | // Allocate buffer for reading disk blocks\r | |
488 | //\r | |
489 | Buffer = AllocateZeroPool ((UINTN)BlockSize);\r | |
490 | if (Buffer == NULL) {\r | |
491 | return EFI_OUT_OF_RESOURCES;\r | |
492 | }\r | |
493 | \r | |
494 | SeqEndBlock = SeqStartBlock + SeqBlocksNum;\r | |
495 | StopSequence = FALSE;\r | |
496 | LvdsCount = 0;\r | |
497 | Status = EFI_VOLUME_CORRUPTED;\r | |
498 | //\r | |
499 | // Start Main Volume Descriptor Sequence\r | |
500 | //\r | |
501 | for (; SeqStartBlock < SeqEndBlock && !StopSequence; SeqStartBlock++) {\r | |
502 | //\r | |
503 | // Read disk block\r | |
504 | //\r | |
505 | Status = BlockIo->ReadBlocks (\r | |
506 | BlockIo,\r | |
507 | BlockIo->Media->MediaId,\r | |
508 | SeqStartBlock,\r | |
509 | BlockSize,\r | |
510 | Buffer\r | |
511 | );\r | |
512 | if (EFI_ERROR (Status)) {\r | |
513 | goto Out_Free;\r | |
514 | }\r | |
515 | \r | |
516 | DescriptorTag = Buffer;\r | |
517 | \r | |
518 | //\r | |
519 | // ECMA 167, 8.4.1 Contents of a Volume Descriptor Sequence\r | |
520 | //\r | |
521 | // - A Volume Descriptor Sequence shall contain one or more Primary Volume\r | |
522 | // Descriptors.\r | |
523 | // - A Volume Descriptor Sequence shall contain zero or more Implementation\r | |
524 | // Use Volume Descriptors.\r | |
525 | // - A Volume Descriptor Sequence shall contain zero or more Partition\r | |
526 | // Descriptors.\r | |
527 | // - A Volume Descriptor Sequence shall contain zero or more Logical Volume\r | |
528 | // Descriptors.\r | |
529 | // - A Volume Descriptor Sequence shall contain zero or more Unallocated\r | |
530 | // Space Descriptors.\r | |
531 | //\r | |
532 | switch (DescriptorTag->TagIdentifier) {\r | |
533 | case UdfPrimaryVolumeDescriptor:\r | |
534 | case UdfImplemenationUseVolumeDescriptor:\r | |
535 | case UdfPartitionDescriptor:\r | |
536 | case UdfUnallocatedSpaceDescriptor:\r | |
537 | break;\r | |
538 | \r | |
539 | case UdfLogicalVolumeDescriptor:\r | |
540 | LogicalVolDesc = Buffer;\r | |
541 | \r | |
542 | //\r | |
543 | // Check for existence of a single LVD and whether it is supported by\r | |
544 | // current EDK2 UDF file system implementation.\r | |
545 | //\r | |
546 | if (++LvdsCount > 1 ||\r | |
547 | !IsLogicalVolumeDescriptorSupported (LogicalVolDesc)) {\r | |
548 | Status = EFI_UNSUPPORTED;\r | |
549 | StopSequence = TRUE;\r | |
550 | }\r | |
551 | \r | |
552 | break;\r | |
553 | \r | |
554 | case UdfTerminatingDescriptor:\r | |
555 | //\r | |
556 | // Stop the sequence when we find a Terminating Descriptor\r | |
557 | // (aka Unallocated Sector), se we don't have to walk all the unallocated\r | |
558 | // area unnecessarily.\r | |
559 | //\r | |
560 | StopSequence = TRUE;\r | |
561 | break;\r | |
562 | \r | |
563 | default:\r | |
564 | //\r | |
565 | // An invalid Volume Descriptor has been found in the sequece. Volume is\r | |
566 | // corrupted.\r | |
567 | //\r | |
568 | Status = EFI_VOLUME_CORRUPTED;\r | |
569 | goto Out_Free;\r | |
570 | }\r | |
571 | }\r | |
572 | \r | |
573 | //\r | |
574 | // Check if LVD was found\r | |
575 | //\r | |
576 | if (!EFI_ERROR (Status) && LvdsCount == 1) {\r | |
577 | *MainVdsStartBlock = GuardMainVdsStartBlock;\r | |
578 | //\r | |
579 | // We do not need to read either LVD or PD descriptors to know the last\r | |
1fbe8276 PA |
580 | // valid block in the found UDF file system. It's already\r |
581 | // LastRecordedBlock.\r | |
baaa3cee | 582 | //\r |
1fbe8276 | 583 | *MainVdsEndBlock = LastRecordedBlock;\r |
baaa3cee PA |
584 | \r |
585 | Status = EFI_SUCCESS;\r | |
586 | }\r | |
587 | \r | |
588 | Out_Free:\r | |
589 | //\r | |
590 | // Free block read buffer\r | |
591 | //\r | |
592 | FreePool (Buffer);\r | |
593 | \r | |
594 | return Status;\r | |
595 | }\r | |
596 | \r | |
597 | /**\r | |
598 | Find a supported UDF file system in block device.\r | |
599 | \r | |
600 | @param[in] BlockIo BlockIo interface.\r | |
601 | @param[in] DiskIo DiskIo interface.\r | |
602 | @param[out] StartingLBA UDF file system starting LBA.\r | |
603 | @param[out] EndingLBA UDF file system starting LBA.\r | |
604 | \r | |
605 | @retval EFI_SUCCESS UDF file system was found.\r | |
606 | @retval other UDF file system was not found.\r | |
607 | \r | |
608 | **/\r | |
609 | EFI_STATUS\r | |
610 | FindUdfFileSystem (\r | |
611 | IN EFI_BLOCK_IO_PROTOCOL *BlockIo,\r | |
612 | IN EFI_DISK_IO_PROTOCOL *DiskIo,\r | |
613 | OUT EFI_LBA *StartingLBA,\r | |
614 | OUT EFI_LBA *EndingLBA\r | |
615 | )\r | |
616 | {\r | |
1fbe8276 | 617 | EFI_STATUS Status;\r |
baaa3cee | 618 | UDF_ANCHOR_VOLUME_DESCRIPTOR_POINTER AnchorPoint;\r |
1fbe8276 | 619 | EFI_LBA LastRecordedBlock;\r |
baaa3cee PA |
620 | \r |
621 | //\r | |
622 | // Find UDF volume identifiers\r | |
623 | //\r | |
624 | Status = FindUdfVolumeIdentifiers (BlockIo, DiskIo);\r | |
625 | if (EFI_ERROR (Status)) {\r | |
626 | return Status;\r | |
8aafec2c PA |
627 | }\r |
628 | \r | |
baaa3cee PA |
629 | //\r |
630 | // Find Anchor Volume Descriptor Pointer\r | |
631 | //\r | |
1fbe8276 PA |
632 | Status = FindAnchorVolumeDescriptorPointer (\r |
633 | BlockIo,\r | |
634 | DiskIo,\r | |
635 | &AnchorPoint,\r | |
636 | &LastRecordedBlock\r | |
637 | );\r | |
8aafec2c | 638 | if (EFI_ERROR (Status)) {\r |
baaa3cee | 639 | return Status;\r |
8aafec2c PA |
640 | }\r |
641 | \r | |
baaa3cee PA |
642 | //\r |
643 | // Find Logical Volume location\r | |
644 | //\r | |
645 | Status = FindLogicalVolumeLocation (\r | |
646 | BlockIo,\r | |
647 | DiskIo,\r | |
648 | &AnchorPoint,\r | |
1fbe8276 | 649 | LastRecordedBlock,\r |
baaa3cee PA |
650 | (UINT64 *)StartingLBA,\r |
651 | (UINT64 *)EndingLBA\r | |
652 | );\r | |
653 | \r | |
654 | return Status;\r | |
8aafec2c PA |
655 | }\r |
656 | \r | |
657 | /**\r | |
658 | Install child handles if the Handle supports UDF/ECMA-167 volume format.\r | |
659 | \r | |
660 | @param[in] This Calling context.\r | |
661 | @param[in] Handle Parent Handle.\r | |
662 | @param[in] DiskIo Parent DiskIo interface.\r | |
663 | @param[in] DiskIo2 Parent DiskIo2 interface.\r | |
664 | @param[in] BlockIo Parent BlockIo interface.\r | |
665 | @param[in] BlockIo2 Parent BlockIo2 interface.\r | |
666 | @param[in] DevicePath Parent Device Path\r | |
667 | \r | |
668 | \r | |
669 | @retval EFI_SUCCESS Child handle(s) was added.\r | |
670 | @retval EFI_MEDIA_CHANGED Media changed Detected.\r | |
671 | @retval other no child handle was added.\r | |
672 | \r | |
673 | **/\r | |
674 | EFI_STATUS\r | |
675 | PartitionInstallUdfChildHandles (\r | |
676 | IN EFI_DRIVER_BINDING_PROTOCOL *This,\r | |
677 | IN EFI_HANDLE Handle,\r | |
678 | IN EFI_DISK_IO_PROTOCOL *DiskIo,\r | |
679 | IN EFI_DISK_IO2_PROTOCOL *DiskIo2,\r | |
680 | IN EFI_BLOCK_IO_PROTOCOL *BlockIo,\r | |
681 | IN EFI_BLOCK_IO2_PROTOCOL *BlockIo2,\r | |
682 | IN EFI_DEVICE_PATH_PROTOCOL *DevicePath\r | |
683 | )\r | |
684 | {\r | |
b19aeeb9 | 685 | UINT32 RemainderByMediaBlockSize;\r |
8aafec2c PA |
686 | EFI_STATUS Status;\r |
687 | EFI_BLOCK_IO_MEDIA *Media;\r | |
8aafec2c | 688 | EFI_PARTITION_INFO_PROTOCOL PartitionInfo;\r |
baaa3cee PA |
689 | EFI_LBA StartingLBA;\r |
690 | EFI_LBA EndingLBA;\r | |
8aafec2c PA |
691 | \r |
692 | Media = BlockIo->Media;\r | |
693 | \r | |
694 | //\r | |
695 | // Check if UDF logical block size is multiple of underlying device block size\r | |
696 | //\r | |
b19aeeb9 LE |
697 | DivU64x32Remainder (\r |
698 | UDF_LOGICAL_SECTOR_SIZE, // Dividend\r | |
699 | Media->BlockSize, // Divisor\r | |
700 | &RemainderByMediaBlockSize // Remainder\r | |
701 | );\r | |
b4e5807d | 702 | if (RemainderByMediaBlockSize != 0) {\r |
8aafec2c PA |
703 | return EFI_NOT_FOUND;\r |
704 | }\r | |
705 | \r | |
8aafec2c | 706 | //\r |
baaa3cee | 707 | // Search for an UDF file system on block device\r |
8aafec2c | 708 | //\r |
baaa3cee | 709 | Status = FindUdfFileSystem (BlockIo, DiskIo, &StartingLBA, &EndingLBA);\r |
8aafec2c PA |
710 | if (EFI_ERROR (Status)) {\r |
711 | return EFI_NOT_FOUND;\r | |
712 | }\r | |
713 | \r | |
714 | //\r | |
715 | // Create Partition Info protocol for UDF file system\r | |
716 | //\r | |
717 | ZeroMem (&PartitionInfo, sizeof (EFI_PARTITION_INFO_PROTOCOL));\r | |
718 | PartitionInfo.Revision = EFI_PARTITION_INFO_PROTOCOL_REVISION;\r | |
719 | PartitionInfo.Type = PARTITION_TYPE_OTHER;\r | |
720 | \r | |
721 | //\r | |
722 | // Install partition child handle for UDF file system\r | |
723 | //\r | |
724 | Status = PartitionInstallChildHandle (\r | |
725 | This,\r | |
726 | Handle,\r | |
727 | DiskIo,\r | |
728 | DiskIo2,\r | |
729 | BlockIo,\r | |
730 | BlockIo2,\r | |
731 | DevicePath,\r | |
732 | (EFI_DEVICE_PATH_PROTOCOL *)&gUdfDevicePath,\r | |
733 | &PartitionInfo,\r | |
baaa3cee PA |
734 | StartingLBA,\r |
735 | EndingLBA,\r | |
8aafec2c PA |
736 | Media->BlockSize\r |
737 | );\r | |
8aafec2c PA |
738 | \r |
739 | return Status;\r | |
740 | }\r |