1 /* 2 * Copyright 2011, Jérôme Duval, korli@users.berlios.de. 3 * Copyright 2008-2010, Axel Dörfler, axeld@pinc-software.de. 4 * This file may be used under the terms of the MIT License. 5 */ 6 7 8 //! Super block, mounting, etc. 9 10 11 #include "Volume.h" 12 13 #include <errno.h> 14 #include <new> 15 #include <stdio.h> 16 #include <stdlib.h> 17 #include <string.h> 18 19 #include <fs_cache.h> 20 #include <fs_volume.h> 21 22 #include <util/AutoLock.h> 23 24 #include "CachedBlock.h" 25 #include "CRCTable.h" 26 #include "Inode.h" 27 #include "InodeJournal.h" 28 #include "NoJournal.h" 29 30 31 //#define TRACE_EXT2 32 #ifdef TRACE_EXT2 33 # define TRACE(x...) dprintf("\33[34mext2:\33[0m " x) 34 #else 35 # define TRACE(x...) ; 36 #endif 37 # define FATAL(x...) dprintf("\33[34mext2:\33[0m " x) 38 39 40 class DeviceOpener { 41 public: 42 DeviceOpener(int fd, int mode); 43 DeviceOpener(const char* device, int mode); 44 ~DeviceOpener(); 45 46 int Open(const char* device, int mode); 47 int Open(int fd, int mode); 48 void* InitCache(off_t numBlocks, uint32 blockSize); 49 void RemoveCache(bool allowWrites); 50 51 void Keep(); 52 53 int Device() const { return fDevice; } 54 int Mode() const { return fMode; } 55 bool IsReadOnly() const { return _IsReadOnly(fMode); } 56 57 status_t GetSize(off_t* _size, uint32* _blockSize = NULL); 58 59 private: 60 static bool _IsReadOnly(int mode) 61 { return (mode & O_RWMASK) == O_RDONLY;} 62 static bool _IsReadWrite(int mode) 63 { return (mode & O_RWMASK) == O_RDWR;} 64 65 int fDevice; 66 int fMode; 67 void* fBlockCache; 68 }; 69 70 71 DeviceOpener::DeviceOpener(const char* device, int mode) 72 : 73 fBlockCache(NULL) 74 { 75 Open(device, mode); 76 } 77 78 79 DeviceOpener::DeviceOpener(int fd, int mode) 80 : 81 fBlockCache(NULL) 82 { 83 Open(fd, mode); 84 } 85 86 87 DeviceOpener::~DeviceOpener() 88 { 89 if (fDevice >= 0) { 90 RemoveCache(false); 91 close(fDevice); 92 } 93 } 94 95 96 int 97 DeviceOpener::Open(const char* device, int mode) 98 { 99 fDevice = open(device, mode | O_NOCACHE); 100 if (fDevice < 0) 101 fDevice = errno; 102 103 if (fDevice < 0 && _IsReadWrite(mode)) { 104 // try again to open read-only (don't rely on a specific error code) 105 return Open(device, O_RDONLY | O_NOCACHE); 106 } 107 108 if (fDevice >= 0) { 109 // opening succeeded 110 fMode = mode; 111 if (_IsReadWrite(mode)) { 112 // check out if the device really allows for read/write access 113 device_geometry geometry; 114 if (!ioctl(fDevice, B_GET_GEOMETRY, &geometry)) { 115 if (geometry.read_only) { 116 // reopen device read-only 117 close(fDevice); 118 return Open(device, O_RDONLY | O_NOCACHE); 119 } 120 } 121 } 122 } 123 124 return fDevice; 125 } 126 127 128 int 129 DeviceOpener::Open(int fd, int mode) 130 { 131 fDevice = dup(fd); 132 if (fDevice < 0) 133 return errno; 134 135 fMode = mode; 136 137 return fDevice; 138 } 139 140 141 void* 142 DeviceOpener::InitCache(off_t numBlocks, uint32 blockSize) 143 { 144 return fBlockCache = block_cache_create(fDevice, numBlocks, blockSize, 145 IsReadOnly()); 146 } 147 148 149 void 150 DeviceOpener::RemoveCache(bool allowWrites) 151 { 152 if (fBlockCache == NULL) 153 return; 154 155 block_cache_delete(fBlockCache, allowWrites); 156 fBlockCache = NULL; 157 } 158 159 160 void 161 DeviceOpener::Keep() 162 { 163 fDevice = -1; 164 } 165 166 167 /*! Returns the size of the device in bytes. It uses B_GET_GEOMETRY 168 to compute the size, or fstat() if that failed. 169 */ 170 status_t 171 DeviceOpener::GetSize(off_t* _size, uint32* _blockSize) 172 { 173 device_geometry geometry; 174 if (ioctl(fDevice, B_GET_GEOMETRY, &geometry) < 0) { 175 // maybe it's just a file 176 struct stat stat; 177 if (fstat(fDevice, &stat) < 0) 178 return B_ERROR; 179 180 if (_size) 181 *_size = stat.st_size; 182 if (_blockSize) // that shouldn't cause us any problems 183 *_blockSize = 512; 184 185 return B_OK; 186 } 187 188 if (_size) { 189 *_size = 1ULL * geometry.head_count * geometry.cylinder_count 190 * geometry.sectors_per_track * geometry.bytes_per_sector; 191 } 192 if (_blockSize) 193 *_blockSize = geometry.bytes_per_sector; 194 195 return B_OK; 196 } 197 198 199 // #pragma mark - 200 201 202 bool 203 ext2_super_block::IsValid() 204 { 205 // TODO: check some more values! 206 if (Magic() != (uint32)EXT2_SUPER_BLOCK_MAGIC) 207 return false; 208 209 return true; 210 } 211 212 213 // #pragma mark - 214 215 216 Volume::Volume(fs_volume* volume) 217 : 218 fFSVolume(volume), 219 fBlockAllocator(NULL), 220 fInodeAllocator(this), 221 fJournalInode(NULL), 222 fFlags(0), 223 fGroupBlocks(NULL), 224 fRootNode(NULL) 225 { 226 mutex_init(&fLock, "ext2 volume"); 227 } 228 229 230 Volume::~Volume() 231 { 232 TRACE("Volume destructor.\n"); 233 delete fBlockAllocator; 234 if (fGroupBlocks != NULL) { 235 uint32 blockCount = (fNumGroups + fGroupsPerBlock - 1) 236 / fGroupsPerBlock; 237 for (uint32 i = 0; i < blockCount; i++) 238 free(fGroupBlocks[i]); 239 240 free(fGroupBlocks); 241 } 242 } 243 244 245 bool 246 Volume::IsValidSuperBlock() 247 { 248 return fSuperBlock.IsValid(); 249 } 250 251 252 bool 253 Volume::HasExtendedAttributes() const 254 { 255 return (fSuperBlock.CompatibleFeatures() & EXT2_FEATURE_EXT_ATTR) != 0; 256 } 257 258 259 const char* 260 Volume::Name() const 261 { 262 if (fSuperBlock.name[0]) 263 return fSuperBlock.name; 264 265 return fName; 266 } 267 268 269 void 270 Volume::SetName(const char* name) 271 { 272 strlcpy(fSuperBlock.name, name, sizeof(fSuperBlock.name)); 273 } 274 275 276 status_t 277 Volume::Mount(const char* deviceName, uint32 flags) 278 { 279 // flags |= B_MOUNT_READ_ONLY; 280 // we only support read-only for now 281 282 if ((flags & B_MOUNT_READ_ONLY) != 0) { 283 TRACE("Volume::Mount(): Read only\n"); 284 } else { 285 TRACE("Volume::Mount(): Read write\n"); 286 } 287 288 DeviceOpener opener(deviceName, (flags & B_MOUNT_READ_ONLY) != 0 289 ? O_RDONLY : O_RDWR); 290 fDevice = opener.Device(); 291 if (fDevice < B_OK) { 292 FATAL("Volume::Mount(): couldn't open device\n"); 293 return fDevice; 294 } 295 296 if (opener.IsReadOnly()) 297 fFlags |= VOLUME_READ_ONLY; 298 299 TRACE("features %lx, incompatible features %lx, read-only features %lx\n", 300 fSuperBlock.CompatibleFeatures(), fSuperBlock.IncompatibleFeatures(), 301 fSuperBlock.ReadOnlyFeatures()); 302 303 // read the super block 304 status_t status = Identify(fDevice, &fSuperBlock); 305 if (status != B_OK) { 306 FATAL("Volume::Mount(): Identify() failed\n"); 307 return status; 308 } 309 310 // check read-only features if mounting read-write 311 if (!IsReadOnly() && _UnsupportedReadOnlyFeatures(fSuperBlock) != 0) 312 return B_NOT_SUPPORTED; 313 314 // initialize short hands to the super block (to save byte swapping) 315 fBlockShift = fSuperBlock.BlockShift(); 316 if (fBlockShift < 10 || fBlockShift > 16) 317 return B_ERROR; 318 fBlockSize = 1UL << fBlockShift; 319 fFirstDataBlock = fSuperBlock.FirstDataBlock(); 320 321 fFreeBlocks = fSuperBlock.FreeBlocks(Has64bitFeature()); 322 fFreeInodes = fSuperBlock.FreeInodes(); 323 324 off_t numBlocks = fSuperBlock.NumBlocks(Has64bitFeature()) - fFirstDataBlock; 325 uint32 blocksPerGroup = fSuperBlock.BlocksPerGroup(); 326 fNumGroups = numBlocks / blocksPerGroup; 327 if (numBlocks % blocksPerGroup != 0) 328 fNumGroups++; 329 330 if (Has64bitFeature()) { 331 fGroupDescriptorSize = fSuperBlock.GroupDescriptorSize(); 332 if (fGroupDescriptorSize < sizeof(ext2_block_group)) 333 return B_ERROR; 334 } else 335 fGroupDescriptorSize = EXT2_BLOCK_GROUP_NORMAL_SIZE; 336 fGroupsPerBlock = fBlockSize / fGroupDescriptorSize; 337 fNumInodes = fSuperBlock.NumInodes(); 338 339 TRACE("block size %ld, num groups %ld, groups per block %ld, first %lu\n", 340 fBlockSize, fNumGroups, fGroupsPerBlock, fFirstDataBlock); 341 342 uint32 blockCount = (fNumGroups + fGroupsPerBlock - 1) / fGroupsPerBlock; 343 344 fGroupBlocks = (uint8**)malloc(blockCount * sizeof(uint8*)); 345 if (fGroupBlocks == NULL) 346 return B_NO_MEMORY; 347 348 memset(fGroupBlocks, 0, blockCount * sizeof(uint8*)); 349 fInodesPerBlock = fBlockSize / InodeSize(); 350 351 // check if the device size is large enough to hold the file system 352 off_t diskSize; 353 status = opener.GetSize(&diskSize); 354 if (status != B_OK) 355 return status; 356 if (diskSize < ((off_t)NumBlocks() << BlockShift())) 357 return B_BAD_VALUE; 358 359 fBlockCache = opener.InitCache(NumBlocks(), fBlockSize); 360 if (fBlockCache == NULL) 361 return B_ERROR; 362 363 TRACE("Volume::Mount(): Initialized block cache: %p\n", fBlockCache); 364 365 // initialize journal if mounted read-write 366 if (!IsReadOnly() && 367 (fSuperBlock.CompatibleFeatures() & EXT2_FEATURE_HAS_JOURNAL) != 0) { 368 // TODO: There should be a mount option to ignore the existent journal 369 if (fSuperBlock.JournalInode() != 0) { 370 fJournalInode = new(std::nothrow) Inode(this, 371 fSuperBlock.JournalInode()); 372 373 if (fJournalInode == NULL) 374 return B_NO_MEMORY; 375 376 TRACE("Opening an on disk, inode mapped journal.\n"); 377 fJournal = new(std::nothrow) InodeJournal(fJournalInode); 378 } else { 379 // TODO: external journal 380 TRACE("Can not open an external journal.\n"); 381 return B_NOT_SUPPORTED; 382 } 383 } else { 384 TRACE("Opening a fake journal (NoJournal).\n"); 385 fJournal = new(std::nothrow) NoJournal(this); 386 } 387 388 if (fJournal == NULL) { 389 TRACE("No memory to create the journal\n"); 390 return B_NO_MEMORY; 391 } 392 393 TRACE("Volume::Mount(): Checking if journal was initialized\n"); 394 status = fJournal->InitCheck(); 395 if (status != B_OK) { 396 FATAL("could not initialize journal!\n"); 397 return status; 398 } 399 400 // TODO: Only recover if asked to 401 TRACE("Volume::Mount(): Asking journal to recover\n"); 402 status = fJournal->Recover(); 403 if (status != B_OK) { 404 FATAL("could not recover journal!\n"); 405 return status; 406 } 407 408 TRACE("Volume::Mount(): Restart journal log\n"); 409 status = fJournal->StartLog(); 410 if (status != B_OK) { 411 FATAL("could not initialize start journal!\n"); 412 return status; 413 } 414 415 if (!IsReadOnly()) { 416 // Initialize allocators 417 fBlockAllocator = new(std::nothrow) BlockAllocator(this); 418 if (fBlockAllocator != NULL) { 419 TRACE("Volume::Mount(): Initialize block allocator\n"); 420 status = fBlockAllocator->Initialize(); 421 } 422 if (fBlockAllocator == NULL || status != B_OK) { 423 delete fBlockAllocator; 424 fBlockAllocator = NULL; 425 FATAL("could not initialize block allocator, going read-only!\n"); 426 fFlags |= VOLUME_READ_ONLY; 427 fJournal->Uninit(); 428 delete fJournal; 429 delete fJournalInode; 430 fJournalInode = NULL; 431 fJournal = new(std::nothrow) NoJournal(this); 432 } 433 } 434 435 // ready 436 status = get_vnode(fFSVolume, EXT2_ROOT_NODE, (void**)&fRootNode); 437 if (status != B_OK) { 438 FATAL("could not create root node: get_vnode() failed!\n"); 439 return status; 440 } 441 442 // all went fine 443 opener.Keep(); 444 445 if (!fSuperBlock.name[0]) { 446 // generate a more or less descriptive volume name 447 off_t divisor = 1ULL << 40; 448 char unit = 'T'; 449 if (diskSize < divisor) { 450 divisor = 1UL << 30; 451 unit = 'G'; 452 if (diskSize < divisor) { 453 divisor = 1UL << 20; 454 unit = 'M'; 455 } 456 } 457 458 double size = double((10 * diskSize + divisor - 1) / divisor); 459 // %g in the kernel does not support precision... 460 461 snprintf(fName, sizeof(fName), "%g %cB Ext2 Volume", 462 size / 10, unit); 463 } 464 465 return B_OK; 466 } 467 468 469 status_t 470 Volume::Unmount() 471 { 472 TRACE("Volume::Unmount()\n"); 473 474 status_t status = fJournal->Uninit(); 475 476 delete fJournal; 477 delete fJournalInode; 478 479 TRACE("Volume::Unmount(): Putting root node\n"); 480 put_vnode(fFSVolume, RootNode()->ID()); 481 TRACE("Volume::Unmount(): Deleting the block cache\n"); 482 block_cache_delete(fBlockCache, !IsReadOnly()); 483 TRACE("Volume::Unmount(): Closing device\n"); 484 close(fDevice); 485 486 TRACE("Volume::Unmount(): Done\n"); 487 return status; 488 } 489 490 491 status_t 492 Volume::GetInodeBlock(ino_t id, off_t& block) 493 { 494 ext2_block_group* group; 495 status_t status = GetBlockGroup((id - 1) / fSuperBlock.InodesPerGroup(), 496 &group); 497 if (status != B_OK) 498 return status; 499 500 block = group->InodeTable(Has64bitFeature()) 501 + ((id - 1) % fSuperBlock.InodesPerGroup()) / fInodesPerBlock; 502 return B_OK; 503 } 504 505 506 uint32 507 Volume::InodeBlockIndex(ino_t id) const 508 { 509 return ((id - 1) % fSuperBlock.InodesPerGroup()) % fInodesPerBlock; 510 } 511 512 513 /*static*/ uint32 514 Volume::_UnsupportedIncompatibleFeatures(ext2_super_block& superBlock) 515 { 516 uint32 supportedIncompatible = EXT2_INCOMPATIBLE_FEATURE_FILE_TYPE 517 | EXT2_INCOMPATIBLE_FEATURE_RECOVER 518 | EXT2_INCOMPATIBLE_FEATURE_JOURNAL 519 | EXT2_INCOMPATIBLE_FEATURE_EXTENTS 520 | EXT2_INCOMPATIBLE_FEATURE_FLEX_GROUP; 521 /*| EXT2_INCOMPATIBLE_FEATURE_META_GROUP*/; 522 uint32 unsupported = superBlock.IncompatibleFeatures() 523 & ~supportedIncompatible; 524 525 if (unsupported != 0) { 526 FATAL("ext2: incompatible features not supported: %lx (extents %x)\n", 527 unsupported, EXT2_INCOMPATIBLE_FEATURE_EXTENTS); 528 } 529 530 return unsupported; 531 } 532 533 534 /*static*/ uint32 535 Volume::_UnsupportedReadOnlyFeatures(ext2_super_block& superBlock) 536 { 537 uint32 supportedReadOnly = EXT2_READ_ONLY_FEATURE_SPARSE_SUPER 538 | EXT2_READ_ONLY_FEATURE_LARGE_FILE 539 | EXT2_READ_ONLY_FEATURE_HUGE_FILE 540 | EXT2_READ_ONLY_FEATURE_EXTRA_ISIZE 541 | EXT2_READ_ONLY_FEATURE_DIR_NLINK 542 | EXT2_READ_ONLY_FEATURE_GDT_CSUM; 543 // TODO actually implement EXT2_READ_ONLY_FEATURE_SPARSE_SUPER when 544 // implementing superblock backup copies 545 546 uint32 unsupported = superBlock.ReadOnlyFeatures() & ~supportedReadOnly; 547 548 if (unsupported != 0) 549 FATAL("ext2: readonly features not supported: %lx\n", unsupported); 550 551 return unsupported; 552 } 553 554 555 uint32 556 Volume::_GroupDescriptorBlock(uint32 blockIndex) 557 { 558 if ((fSuperBlock.IncompatibleFeatures() 559 & EXT2_INCOMPATIBLE_FEATURE_META_GROUP) == 0 560 || blockIndex < fSuperBlock.FirstMetaBlockGroup()) 561 return fFirstDataBlock + blockIndex + 1; 562 563 panic("meta block"); 564 return 0; 565 } 566 567 568 uint16 569 Volume::_GroupCheckSum(ext2_block_group *group, int32 index) 570 { 571 uint16 checksum = 0; 572 if (HasChecksumFeature()) { 573 int32 number = B_HOST_TO_LENDIAN_INT32(index); 574 checksum = calculate_crc(0xffff, fSuperBlock.uuid, 575 sizeof(fSuperBlock.uuid)); 576 checksum = calculate_crc(checksum, (uint8*)&number, sizeof(number)); 577 checksum = calculate_crc(checksum, (uint8*)group, 30); 578 if (Has64bitFeature()) { 579 checksum = calculate_crc(checksum, (uint8*)group + 34, 580 fGroupDescriptorSize - 34); 581 } 582 } 583 return checksum; 584 } 585 586 587 /*! Makes the requested block group available. 588 The block groups are loaded on demand, but are kept in memory until the 589 volume is unmounted; therefore we don't use the block cache. 590 */ 591 status_t 592 Volume::GetBlockGroup(int32 index, ext2_block_group** _group) 593 { 594 if (index < 0 || (uint32)index > fNumGroups) 595 return B_BAD_VALUE; 596 597 int32 blockIndex = index / fGroupsPerBlock; 598 int32 blockOffset = index % fGroupsPerBlock; 599 600 MutexLocker _(fLock); 601 602 if (fGroupBlocks[blockIndex] == NULL) { 603 CachedBlock cached(this); 604 const uint8* block = cached.SetTo(_GroupDescriptorBlock(blockIndex)); 605 if (block == NULL) 606 return B_IO_ERROR; 607 608 fGroupBlocks[blockIndex] = (uint8*)malloc(fBlockSize); 609 if (fGroupBlocks[blockIndex] == NULL) 610 return B_NO_MEMORY; 611 612 memcpy(fGroupBlocks[blockIndex], block, fBlockSize); 613 614 TRACE("group [%ld]: inode table %lld\n", index, ((ext2_block_group*) 615 (fGroupBlocks[blockIndex] + blockOffset 616 * fGroupDescriptorSize))->InodeTable(Has64bitFeature())); 617 } 618 619 *_group = (ext2_block_group*)(fGroupBlocks[blockIndex] 620 + blockOffset * fGroupDescriptorSize); 621 if (HasChecksumFeature() 622 && (*_group)->checksum != _GroupCheckSum(*_group, index)) { 623 return B_BAD_DATA; 624 } 625 return B_OK; 626 } 627 628 629 status_t 630 Volume::WriteBlockGroup(Transaction& transaction, int32 index) 631 { 632 if (index < 0 || (uint32)index > fNumGroups) 633 return B_BAD_VALUE; 634 635 TRACE("Volume::WriteBlockGroup()\n"); 636 637 int32 blockIndex = index / fGroupsPerBlock; 638 int32 blockOffset = index % fGroupsPerBlock; 639 640 MutexLocker _(fLock); 641 642 if (fGroupBlocks[blockIndex] == NULL) 643 return B_BAD_VALUE; 644 645 ext2_block_group *group = (ext2_block_group*)(fGroupBlocks[blockIndex] 646 + blockOffset * fGroupDescriptorSize); 647 648 group->checksum = _GroupCheckSum(group, index); 649 TRACE("Volume::WriteBlockGroup() checksum 0x%x for group %ld " 650 "(free inodes %ld, unused %ld)\n", group->checksum, index, 651 group->FreeInodes(Has64bitFeature()), 652 group->UnusedInodes(Has64bitFeature())); 653 654 CachedBlock cached(this); 655 uint8* block = cached.SetToWritable(transaction, 656 _GroupDescriptorBlock(blockIndex)); 657 if (block == NULL) 658 return B_IO_ERROR; 659 660 memcpy(block, (const uint8*)fGroupBlocks[blockIndex], fBlockSize); 661 662 // TODO: Write copies 663 664 return B_OK; 665 } 666 667 668 status_t 669 Volume::ActivateLargeFiles(Transaction& transaction) 670 { 671 if ((fSuperBlock.ReadOnlyFeatures() 672 & EXT2_READ_ONLY_FEATURE_LARGE_FILE) != 0) 673 return B_OK; 674 675 fSuperBlock.SetReadOnlyFeatures(fSuperBlock.ReadOnlyFeatures() 676 | EXT2_READ_ONLY_FEATURE_LARGE_FILE); 677 678 return WriteSuperBlock(transaction); 679 } 680 681 682 status_t 683 Volume::ActivateDirNLink(Transaction& transaction) 684 { 685 if ((fSuperBlock.ReadOnlyFeatures() 686 & EXT2_READ_ONLY_FEATURE_DIR_NLINK) != 0) 687 return B_OK; 688 689 fSuperBlock.SetReadOnlyFeatures(fSuperBlock.ReadOnlyFeatures() 690 | EXT2_READ_ONLY_FEATURE_DIR_NLINK); 691 692 return WriteSuperBlock(transaction); 693 } 694 695 696 status_t 697 Volume::SaveOrphan(Transaction& transaction, ino_t newID, ino_t& oldID) 698 { 699 oldID = fSuperBlock.LastOrphan(); 700 TRACE("Volume::SaveOrphan(): Old: %d, New: %d\n", (int)oldID, (int)newID); 701 fSuperBlock.SetLastOrphan(newID); 702 703 return WriteSuperBlock(transaction); 704 } 705 706 707 status_t 708 Volume::RemoveOrphan(Transaction& transaction, ino_t id) 709 { 710 ino_t currentID = fSuperBlock.LastOrphan(); 711 TRACE("Volume::RemoveOrphan(): ID: %d\n", (int)id); 712 if (currentID == 0) 713 return B_OK; 714 715 CachedBlock cached(this); 716 717 off_t blockNum; 718 status_t status = GetInodeBlock(currentID, blockNum); 719 if (status != B_OK) 720 return status; 721 722 uint8* block = cached.SetToWritable(transaction, blockNum); 723 if (block == NULL) 724 return B_IO_ERROR; 725 726 ext2_inode* inode = (ext2_inode*)(block 727 + InodeBlockIndex(currentID) * InodeSize()); 728 729 if (currentID == id) { 730 TRACE("Volume::RemoveOrphan(): First entry. Updating head to: %d\n", 731 (int)inode->NextOrphan()); 732 fSuperBlock.SetLastOrphan(inode->NextOrphan()); 733 734 return WriteSuperBlock(transaction); 735 } 736 737 currentID = inode->NextOrphan(); 738 if (currentID == 0) 739 return B_OK; 740 741 do { 742 off_t lastBlockNum = blockNum; 743 status = GetInodeBlock(currentID, blockNum); 744 if (status != B_OK) 745 return status; 746 747 if (blockNum != lastBlockNum) { 748 block = cached.SetToWritable(transaction, blockNum); 749 if (block == NULL) 750 return B_IO_ERROR; 751 } 752 753 ext2_inode* inode = (ext2_inode*)(block 754 + InodeBlockIndex(currentID) * InodeSize()); 755 756 currentID = inode->NextOrphan(); 757 if (currentID == 0) 758 return B_OK; 759 } while(currentID != id); 760 761 CachedBlock cachedRemoved(this); 762 763 status = GetInodeBlock(id, blockNum); 764 if (status != B_OK) 765 return status; 766 767 uint8* removedBlock = cachedRemoved.SetToWritable(transaction, blockNum); 768 if (removedBlock == NULL) 769 return B_IO_ERROR; 770 771 ext2_inode* removedInode = (ext2_inode*)(removedBlock 772 + InodeBlockIndex(id) * InodeSize()); 773 774 // Next orphan is stored inside deletion time 775 inode->deletion_time = removedInode->deletion_time; 776 TRACE("Volume::RemoveOrphan(): Updated pointer to %d\n", 777 (int)inode->NextOrphan()); 778 779 return status; 780 } 781 782 783 status_t 784 Volume::AllocateInode(Transaction& transaction, Inode* parent, int32 mode, 785 ino_t& id) 786 { 787 status_t status = fInodeAllocator.New(transaction, parent, mode, id); 788 if (status != B_OK) 789 return status; 790 791 --fFreeInodes; 792 793 return WriteSuperBlock(transaction); 794 } 795 796 797 status_t 798 Volume::FreeInode(Transaction& transaction, ino_t id, bool isDirectory) 799 { 800 status_t status = fInodeAllocator.Free(transaction, id, isDirectory); 801 if (status != B_OK) 802 return status; 803 804 ++fFreeInodes; 805 806 return WriteSuperBlock(transaction); 807 } 808 809 810 status_t 811 Volume::AllocateBlocks(Transaction& transaction, uint32 minimum, uint32 maximum, 812 uint32& blockGroup, fsblock_t& start, uint32& length) 813 { 814 TRACE("Volume::AllocateBlocks()\n"); 815 if (IsReadOnly()) 816 return B_READ_ONLY_DEVICE; 817 818 TRACE("Volume::AllocateBlocks(): Calling the block allocator\n"); 819 820 status_t status = fBlockAllocator->AllocateBlocks(transaction, minimum, 821 maximum, blockGroup, start, length); 822 if (status != B_OK) 823 return status; 824 825 TRACE("Volume::AllocateBlocks(): Allocated %lu blocks\n", length); 826 827 fFreeBlocks -= length; 828 829 return WriteSuperBlock(transaction); 830 } 831 832 833 status_t 834 Volume::FreeBlocks(Transaction& transaction, fsblock_t start, uint32 length) 835 { 836 TRACE("Volume::FreeBlocks(%llu, %lu)\n", start, length); 837 if (IsReadOnly()) 838 return B_READ_ONLY_DEVICE; 839 840 status_t status = fBlockAllocator->Free(transaction, start, length); 841 if (status != B_OK) 842 return status; 843 844 TRACE("Volume::FreeBlocks(): number of free blocks (before): %llu\n", 845 fFreeBlocks); 846 fFreeBlocks += length; 847 TRACE("Volume::FreeBlocks(): number of free blocks (after): %llu\n", 848 fFreeBlocks); 849 850 return WriteSuperBlock(transaction); 851 } 852 853 854 status_t 855 Volume::LoadSuperBlock() 856 { 857 CachedBlock cached(this); 858 const uint8* block = cached.SetTo(fFirstDataBlock); 859 860 if (block == NULL) 861 return B_IO_ERROR; 862 863 if (fFirstDataBlock == 0) 864 memcpy(&fSuperBlock, block + 1024, sizeof(fSuperBlock)); 865 else 866 memcpy(&fSuperBlock, block, sizeof(fSuperBlock)); 867 868 fFreeBlocks = fSuperBlock.FreeBlocks(Has64bitFeature()); 869 fFreeInodes = fSuperBlock.FreeInodes(); 870 871 return B_OK; 872 } 873 874 875 status_t 876 Volume::WriteSuperBlock(Transaction& transaction) 877 { 878 TRACE("Volume::WriteSuperBlock()\n"); 879 fSuperBlock.SetFreeBlocks(fFreeBlocks, Has64bitFeature()); 880 fSuperBlock.SetFreeInodes(fFreeInodes); 881 // TODO: Rest of fields that can be modified 882 883 TRACE("Volume::WriteSuperBlock(): free blocks: %llu, free inodes: %lu\n", 884 fSuperBlock.FreeBlocks(Has64bitFeature()), fSuperBlock.FreeInodes()); 885 886 CachedBlock cached(this); 887 uint8* block = cached.SetToWritable(transaction, fFirstDataBlock); 888 889 if (block == NULL) 890 return B_IO_ERROR; 891 892 TRACE("Volume::WriteSuperBlock(): first data block: %lu, block: %p, " 893 "superblock: %p\n", fFirstDataBlock, block, &fSuperBlock); 894 895 if (fFirstDataBlock == 0) 896 memcpy(block + 1024, &fSuperBlock, sizeof(fSuperBlock)); 897 else 898 memcpy(block, &fSuperBlock, sizeof(fSuperBlock)); 899 900 TRACE("Volume::WriteSuperBlock(): Done\n"); 901 902 return B_OK; 903 } 904 905 906 status_t 907 Volume::FlushDevice() 908 { 909 TRACE("Volume::FlushDevice(): %p, %p\n", this, fBlockCache); 910 return block_cache_sync(fBlockCache); 911 } 912 913 914 status_t 915 Volume::Sync() 916 { 917 TRACE("Volume::Sync()\n"); 918 return fJournal->Uninit(); 919 } 920 921 922 // #pragma mark - Disk scanning and initialization 923 924 925 /*static*/ status_t 926 Volume::Identify(int fd, ext2_super_block* superBlock) 927 { 928 if (read_pos(fd, EXT2_SUPER_BLOCK_OFFSET, superBlock, 929 sizeof(ext2_super_block)) != sizeof(ext2_super_block)) 930 return B_IO_ERROR; 931 932 if (!superBlock->IsValid()) { 933 FATAL("invalid super block!\n"); 934 return B_BAD_VALUE; 935 } 936 937 return _UnsupportedIncompatibleFeatures(*superBlock) == 0 938 ? B_OK : B_NOT_SUPPORTED; 939 } 940 941 942 void 943 Volume::TransactionDone(bool success) 944 { 945 if (!success) { 946 status_t status = LoadSuperBlock(); 947 if (status != B_OK) 948 panic("Failed to reload ext2 superblock.\n"); 949 } 950 } 951 952 953 void 954 Volume::RemovedFromTransaction() 955 { 956 // TODO: Does it make a difference? 957 } 958