1 /* 2 * Copyright 2010, Jérôme Duval, korli@users.berlios.de. 3 * Copyright 2008, Axel Dörfler, axeld@pinc-software.de. 4 * This file may be used under the terms of the MIT License. 5 */ 6 7 8 #include <algorithm> 9 #include <dirent.h> 10 #include <sys/ioctl.h> 11 #include <util/kernel_cpp.h> 12 #include <string.h> 13 14 #include <AutoDeleter.h> 15 #include <fs_cache.h> 16 #include <fs_info.h> 17 #include <io_requests.h> 18 #include <NodeMonitor.h> 19 #include <util/AutoLock.h> 20 21 #include "Attribute.h" 22 #include "CachedBlock.h" 23 #include "DirectoryIterator.h" 24 #include "ext2.h" 25 #include "HTree.h" 26 #include "Inode.h" 27 #include "Journal.h" 28 #include "Utility.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 ERROR(x...) dprintf("\33[34mext2:\33[0m " x) 38 39 40 #define EXT2_IO_SIZE 65536 41 42 43 struct identify_cookie { 44 ext2_super_block super_block; 45 }; 46 47 48 // #pragma mark - Scanning 49 50 51 static float 52 ext2_identify_partition(int fd, partition_data *partition, void **_cookie) 53 { 54 STATIC_ASSERT(sizeof(struct ext2_super_block) == 1024); 55 STATIC_ASSERT(sizeof(struct ext2_block_group) == 64); 56 57 ext2_super_block superBlock; 58 status_t status = Volume::Identify(fd, &superBlock); 59 if (status != B_OK) 60 return -1; 61 62 identify_cookie *cookie = new identify_cookie; 63 memcpy(&cookie->super_block, &superBlock, sizeof(ext2_super_block)); 64 65 *_cookie = cookie; 66 return 0.8f; 67 } 68 69 70 static status_t 71 ext2_scan_partition(int fd, partition_data *partition, void *_cookie) 72 { 73 identify_cookie *cookie = (identify_cookie *)_cookie; 74 75 partition->status = B_PARTITION_VALID; 76 partition->flags |= B_PARTITION_FILE_SYSTEM; 77 partition->content_size = cookie->super_block.NumBlocks( 78 (cookie->super_block.CompatibleFeatures() 79 & EXT2_INCOMPATIBLE_FEATURE_64BIT) != 0) 80 << cookie->super_block.BlockShift(); 81 partition->block_size = 1UL << cookie->super_block.BlockShift(); 82 partition->content_name = strdup(cookie->super_block.name); 83 if (partition->content_name == NULL) 84 return B_NO_MEMORY; 85 86 return B_OK; 87 } 88 89 90 static void 91 ext2_free_identify_partition_cookie(partition_data* partition, void* _cookie) 92 { 93 delete (identify_cookie*)_cookie; 94 } 95 96 97 // #pragma mark - 98 99 100 static status_t 101 ext2_mount(fs_volume* _volume, const char* device, uint32 flags, 102 const char* args, ino_t* _rootID) 103 { 104 Volume* volume = new(std::nothrow) Volume(_volume); 105 if (volume == NULL) 106 return B_NO_MEMORY; 107 108 // TODO: this is a bit hacky: we can't use publish_vnode() to publish 109 // the root node, or else its file cache cannot be created (we could 110 // create it later, though). Therefore we're using get_vnode() in Mount(), 111 // but that requires us to export our volume data before calling it. 112 _volume->private_volume = volume; 113 _volume->ops = &gExt2VolumeOps; 114 115 status_t status = volume->Mount(device, flags); 116 if (status != B_OK) { 117 ERROR("Failed mounting the volume. Error: %s\n", strerror(status)); 118 delete volume; 119 return status; 120 } 121 122 *_rootID = volume->RootNode()->ID(); 123 return B_OK; 124 } 125 126 127 static status_t 128 ext2_unmount(fs_volume *_volume) 129 { 130 Volume* volume = (Volume *)_volume->private_volume; 131 132 status_t status = volume->Unmount(); 133 delete volume; 134 135 return status; 136 } 137 138 139 static status_t 140 ext2_read_fs_info(fs_volume* _volume, struct fs_info* info) 141 { 142 Volume* volume = (Volume*)_volume->private_volume; 143 144 // File system flags 145 info->flags = B_FS_IS_PERSISTENT | B_FS_HAS_ATTR 146 | (volume->IsReadOnly() ? B_FS_IS_READONLY : 0); 147 info->io_size = EXT2_IO_SIZE; 148 info->block_size = volume->BlockSize(); 149 info->total_blocks = volume->NumBlocks(); 150 info->free_blocks = volume->NumFreeBlocks(); 151 152 // Volume name 153 strlcpy(info->volume_name, volume->Name(), sizeof(info->volume_name)); 154 155 // File system name 156 if (volume->HasExtentsFeature()) 157 strlcpy(info->fsh_name, "ext4", sizeof(info->fsh_name)); 158 else if (volume->HasJournalFeature()) 159 strlcpy(info->fsh_name, "ext3", sizeof(info->fsh_name)); 160 else 161 strlcpy(info->fsh_name, "ext2", sizeof(info->fsh_name)); 162 163 return B_OK; 164 } 165 166 167 static status_t 168 ext2_write_fs_info(fs_volume* _volume, const struct fs_info* info, uint32 mask) 169 { 170 Volume* volume = (Volume*)_volume->private_volume; 171 172 if (volume->IsReadOnly()) 173 return B_READ_ONLY_DEVICE; 174 175 MutexLocker locker(volume->Lock()); 176 177 status_t status = B_BAD_VALUE; 178 179 if (mask & FS_WRITE_FSINFO_NAME) { 180 Transaction transaction(volume->GetJournal()); 181 volume->SetName(info->volume_name); 182 status = volume->WriteSuperBlock(transaction); 183 transaction.Done(); 184 } 185 return status; 186 } 187 188 189 static status_t 190 ext2_sync(fs_volume* _volume) 191 { 192 Volume* volume = (Volume*)_volume->private_volume; 193 return volume->Sync(); 194 } 195 196 197 // #pragma mark - 198 199 200 static status_t 201 ext2_get_vnode(fs_volume* _volume, ino_t id, fs_vnode* _node, int* _type, 202 uint32* _flags, bool reenter) 203 { 204 Volume* volume = (Volume*)_volume->private_volume; 205 206 if (id < 2 || id > volume->NumInodes()) { 207 ERROR("invalid inode id %" B_PRIdINO " requested!\n", id); 208 return B_BAD_VALUE; 209 } 210 211 Inode* inode = new(std::nothrow) Inode(volume, id); 212 if (inode == NULL) 213 return B_NO_MEMORY; 214 215 status_t status = inode->InitCheck(); 216 if (status != B_OK) 217 delete inode; 218 219 if (status == B_OK) { 220 _node->private_node = inode; 221 _node->ops = &gExt2VnodeOps; 222 *_type = inode->Mode(); 223 *_flags = 0; 224 } else 225 ERROR("get_vnode: InitCheck() failed. Error: %s\n", strerror(status)); 226 227 return status; 228 } 229 230 231 static status_t 232 ext2_put_vnode(fs_volume* _volume, fs_vnode* _node, bool reenter) 233 { 234 delete (Inode*)_node->private_node; 235 return B_OK; 236 } 237 238 239 static status_t 240 ext2_remove_vnode(fs_volume* _volume, fs_vnode* _node, bool reenter) 241 { 242 TRACE("ext2_remove_vnode()\n"); 243 Volume* volume = (Volume*)_volume->private_volume; 244 Inode* inode = (Inode*)_node->private_node; 245 ObjectDeleter<Inode> inodeDeleter(inode); 246 247 if (!inode->IsDeleted()) 248 return B_OK; 249 250 TRACE("ext2_remove_vnode(): Starting transaction\n"); 251 Transaction transaction(volume->GetJournal()); 252 253 if (!inode->IsSymLink() || inode->Size() >= EXT2_SHORT_SYMLINK_LENGTH) { 254 TRACE("ext2_remove_vnode(): Truncating\n"); 255 status_t status = inode->Resize(transaction, 0); 256 if (status != B_OK) 257 return status; 258 } 259 260 TRACE("ext2_remove_vnode(): Removing from orphan list\n"); 261 status_t status = volume->RemoveOrphan(transaction, inode->ID()); 262 if (status != B_OK) 263 return status; 264 265 TRACE("ext2_remove_vnode(): Setting deletion time\n"); 266 inode->Node().SetDeletionTime(real_time_clock()); 267 268 status = inode->WriteBack(transaction); 269 if (status != B_OK) 270 return status; 271 272 TRACE("ext2_remove_vnode(): Freeing inode\n"); 273 status = volume->FreeInode(transaction, inode->ID(), inode->IsDirectory()); 274 275 // TODO: When Transaction::Done() fails, do we have to re-add the vnode? 276 if (status == B_OK) 277 status = transaction.Done(); 278 279 return status; 280 } 281 282 283 static bool 284 ext2_can_page(fs_volume* _volume, fs_vnode* _node, void* _cookie) 285 { 286 return true; 287 } 288 289 290 static status_t 291 ext2_read_pages(fs_volume* _volume, fs_vnode* _node, void* _cookie, 292 off_t pos, const iovec* vecs, size_t count, size_t* _numBytes) 293 { 294 Volume* volume = (Volume*)_volume->private_volume; 295 Inode* inode = (Inode*)_node->private_node; 296 297 if (inode->FileCache() == NULL) 298 return B_BAD_VALUE; 299 300 rw_lock_read_lock(inode->Lock()); 301 302 uint32 vecIndex = 0; 303 size_t vecOffset = 0; 304 size_t bytesLeft = *_numBytes; 305 status_t status; 306 307 while (true) { 308 file_io_vec fileVecs[8]; 309 size_t fileVecCount = 8; 310 311 status = file_map_translate(inode->Map(), pos, bytesLeft, fileVecs, 312 &fileVecCount, 0); 313 if (status != B_OK && status != B_BUFFER_OVERFLOW) 314 break; 315 316 bool bufferOverflow = status == B_BUFFER_OVERFLOW; 317 318 size_t bytes = bytesLeft; 319 status = read_file_io_vec_pages(volume->Device(), fileVecs, 320 fileVecCount, vecs, count, &vecIndex, &vecOffset, &bytes); 321 if (status != B_OK || !bufferOverflow) 322 break; 323 324 pos += bytes; 325 bytesLeft -= bytes; 326 } 327 328 rw_lock_read_unlock(inode->Lock()); 329 330 return status; 331 } 332 333 334 static status_t 335 ext2_write_pages(fs_volume* _volume, fs_vnode* _node, void* _cookie, 336 off_t pos, const iovec* vecs, size_t count, size_t* _numBytes) 337 { 338 Volume* volume = (Volume*)_volume->private_volume; 339 Inode* inode = (Inode*)_node->private_node; 340 341 if (volume->IsReadOnly()) 342 return B_READ_ONLY_DEVICE; 343 344 if (inode->FileCache() == NULL) 345 return B_BAD_VALUE; 346 347 rw_lock_read_lock(inode->Lock()); 348 349 uint32 vecIndex = 0; 350 size_t vecOffset = 0; 351 size_t bytesLeft = *_numBytes; 352 status_t status; 353 354 while (true) { 355 file_io_vec fileVecs[8]; 356 size_t fileVecCount = 8; 357 358 status = file_map_translate(inode->Map(), pos, bytesLeft, fileVecs, 359 &fileVecCount, 0); 360 if (status != B_OK && status != B_BUFFER_OVERFLOW) 361 break; 362 363 bool bufferOverflow = status == B_BUFFER_OVERFLOW; 364 365 size_t bytes = bytesLeft; 366 status = write_file_io_vec_pages(volume->Device(), fileVecs, 367 fileVecCount, vecs, count, &vecIndex, &vecOffset, &bytes); 368 if (status != B_OK || !bufferOverflow) 369 break; 370 371 pos += bytes; 372 bytesLeft -= bytes; 373 } 374 375 rw_lock_read_unlock(inode->Lock()); 376 377 return status; 378 } 379 380 381 static status_t 382 ext2_get_file_map(fs_volume* _volume, fs_vnode* _node, off_t offset, 383 size_t size, struct file_io_vec* vecs, size_t* _count) 384 { 385 TRACE("ext2_get_file_map()\n"); 386 Volume* volume = (Volume*)_volume->private_volume; 387 Inode* inode = (Inode*)_node->private_node; 388 size_t index = 0, max = *_count; 389 390 while (true) { 391 fsblock_t block; 392 uint32 count = 1; 393 status_t status = inode->FindBlock(offset, block, &count); 394 if (status != B_OK) 395 return status; 396 397 if (block > volume->NumBlocks()) { 398 panic("ext2_get_file_map() found block %" B_PRIu64 " for offset %" 399 B_PRIdOFF "\n", block, offset); 400 } 401 402 off_t blockOffset = block << volume->BlockShift(); 403 uint32 blockLength = volume->BlockSize() * count; 404 405 if (index > 0 && (vecs[index - 1].offset 406 == blockOffset - vecs[index - 1].length 407 || (vecs[index - 1].offset == -1 && block == 0))) { 408 vecs[index - 1].length += blockLength; 409 } else { 410 if (index >= max) { 411 // we're out of file_io_vecs; let's bail out 412 *_count = index; 413 return B_BUFFER_OVERFLOW; 414 } 415 416 // 'block' is 0 for sparse blocks 417 if (block != 0) 418 vecs[index].offset = blockOffset; 419 else 420 vecs[index].offset = -1; 421 422 vecs[index].length = blockLength; 423 index++; 424 } 425 426 offset += blockLength; 427 428 if (offset >= inode->Size() || size <= blockLength) { 429 // We're done! 430 *_count = index; 431 TRACE("ext2_get_file_map for inode %" B_PRIdINO "\n", inode->ID()); 432 return B_OK; 433 } 434 435 size -= blockLength; 436 } 437 438 // can never get here 439 return B_ERROR; 440 } 441 442 443 // #pragma mark - 444 445 446 static status_t 447 ext2_lookup(fs_volume* _volume, fs_vnode* _directory, const char* name, 448 ino_t* _vnodeID) 449 { 450 TRACE("ext2_lookup: name address: %p\n", name); 451 TRACE("ext2_lookup: name: %s\n", name); 452 Volume* volume = (Volume*)_volume->private_volume; 453 Inode* directory = (Inode*)_directory->private_node; 454 455 // check access permissions 456 status_t status = directory->CheckPermissions(X_OK); 457 if (status < B_OK) 458 return status; 459 460 HTree htree(volume, directory); 461 DirectoryIterator* iterator; 462 463 status = htree.Lookup(name, &iterator); 464 if (status != B_OK) 465 return status; 466 467 ObjectDeleter<DirectoryIterator> iteratorDeleter(iterator); 468 469 status = iterator->FindEntry(name, _vnodeID); 470 if (status != B_OK) { 471 if (status == B_ENTRY_NOT_FOUND) 472 entry_cache_add_missing(volume->ID(), directory->ID(), name); 473 return status; 474 } 475 entry_cache_add(volume->ID(), directory->ID(), name, *_vnodeID); 476 477 return get_vnode(volume->FSVolume(), *_vnodeID, NULL); 478 } 479 480 481 static status_t 482 ext2_ioctl(fs_volume* _volume, fs_vnode* _node, void* _cookie, uint32 cmd, 483 void* buffer, size_t bufferLength) 484 { 485 TRACE("ioctl: %" B_PRIu32 "\n", cmd); 486 487 Volume* volume = (Volume*)_volume->private_volume; 488 switch (cmd) { 489 case 56742: 490 { 491 TRACE("ioctl: Test the block allocator\n"); 492 // Test the block allocator 493 TRACE("ioctl: Creating transaction\n"); 494 Transaction transaction(volume->GetJournal()); 495 TRACE("ioctl: Creating cached block\n"); 496 CachedBlock cached(volume); 497 uint32 blocksPerGroup = volume->BlocksPerGroup(); 498 uint32 blockSize = volume->BlockSize(); 499 uint32 firstBlock = volume->FirstDataBlock(); 500 fsblock_t start = 0; 501 uint32 group = 0; 502 uint32 length; 503 504 TRACE("ioctl: blocks per group: %" B_PRIu32 ", block size: %" 505 B_PRIu32 ", first block: %" B_PRIu32 ", start: %" B_PRIu64 506 ", group: %" B_PRIu32 "\n", blocksPerGroup, 507 blockSize, firstBlock, start, group); 508 509 while (volume->AllocateBlocks(transaction, 1, 2048, group, start, 510 length) == B_OK) { 511 TRACE("ioctl: Allocated blocks in group %" B_PRIu32 ": %" 512 B_PRIu64 "-%" B_PRIu64 "\n", group, start, start + length); 513 off_t blockNum = start + group * blocksPerGroup - firstBlock; 514 515 for (uint32 i = 0; i < length; ++i) { 516 uint8* block = cached.SetToWritable(transaction, blockNum); 517 memset(block, 0, blockSize); 518 blockNum++; 519 } 520 521 TRACE("ioctl: Blocks cleared\n"); 522 523 transaction.Done(); 524 transaction.Start(volume->GetJournal()); 525 } 526 527 TRACE("ioctl: Done\n"); 528 529 return B_OK; 530 } 531 532 case FIOSEEKDATA: 533 case FIOSEEKHOLE: 534 { 535 off_t* offset = (off_t*)buffer; 536 Inode* inode = (Inode*)_node->private_node; 537 538 if (*offset >= inode->Size()) 539 return ENXIO; 540 541 while (*offset < inode->Size()) { 542 fsblock_t block; 543 uint32 count = 1; 544 status_t status = inode->FindBlock(*offset, block, &count); 545 if (status != B_OK) 546 return status; 547 if ((block != 0 && cmd == FIOSEEKDATA) 548 || (block == 0 && cmd == FIOSEEKHOLE)) { 549 return B_OK; 550 } 551 *offset += count * volume->BlockSize(); 552 } 553 554 if (*offset > inode->Size()) 555 *offset = inode->Size(); 556 return cmd == FIOSEEKDATA ? ENXIO : B_OK; 557 } 558 } 559 560 return B_DEV_INVALID_IOCTL; 561 } 562 563 564 static status_t 565 ext2_fsync(fs_volume* _volume, fs_vnode* _node) 566 { 567 Inode* inode = (Inode*)_node->private_node; 568 return inode->Sync(); 569 } 570 571 572 static status_t 573 ext2_read_stat(fs_volume* _volume, fs_vnode* _node, struct stat* stat) 574 { 575 Inode* inode = (Inode*)_node->private_node; 576 const ext2_inode& node = inode->Node(); 577 578 stat->st_dev = inode->GetVolume()->ID(); 579 stat->st_ino = inode->ID(); 580 stat->st_nlink = node.NumLinks(); 581 stat->st_blksize = EXT2_IO_SIZE; 582 583 stat->st_uid = node.UserID(); 584 stat->st_gid = node.GroupID(); 585 stat->st_mode = node.Mode(); 586 stat->st_type = 0; 587 588 inode->GetAccessTime(&stat->st_atim); 589 inode->GetModificationTime(&stat->st_mtim); 590 inode->GetChangeTime(&stat->st_ctim); 591 inode->GetCreationTime(&stat->st_crtim); 592 593 stat->st_size = inode->Size(); 594 stat->st_blocks = inode->NumBlocks(); 595 596 return B_OK; 597 } 598 599 600 status_t 601 ext2_write_stat(fs_volume* _volume, fs_vnode* _node, const struct stat* stat, 602 uint32 mask) 603 { 604 TRACE("ext2_write_stat\n"); 605 Volume* volume = (Volume*)_volume->private_volume; 606 607 if (volume->IsReadOnly()) 608 return B_READ_ONLY_DEVICE; 609 610 Inode* inode = (Inode*)_node->private_node; 611 612 ext2_inode& node = inode->Node(); 613 bool updateTime = false; 614 uid_t uid = geteuid(); 615 616 bool isOwnerOrRoot = uid == 0 || uid == (uid_t)node.UserID(); 617 bool hasWriteAccess = inode->CheckPermissions(W_OK) == B_OK; 618 619 TRACE("ext2_write_stat: Starting transaction\n"); 620 Transaction transaction(volume->GetJournal()); 621 inode->WriteLockInTransaction(transaction); 622 623 if ((mask & B_STAT_SIZE) != 0 && inode->Size() != stat->st_size) { 624 if (inode->IsDirectory()) 625 return B_IS_A_DIRECTORY; 626 if (!inode->IsFile()) 627 return B_BAD_VALUE; 628 if (!hasWriteAccess) 629 return B_NOT_ALLOWED; 630 631 TRACE("ext2_write_stat: Old size: %ld, new size: %ld\n", 632 (long)inode->Size(), (long)stat->st_size); 633 634 off_t oldSize = inode->Size(); 635 636 status_t status = inode->Resize(transaction, stat->st_size); 637 if (status != B_OK) 638 return status; 639 640 if ((mask & B_STAT_SIZE_INSECURE) == 0) { 641 rw_lock_write_unlock(inode->Lock()); 642 inode->FillGapWithZeros(oldSize, inode->Size()); 643 rw_lock_write_lock(inode->Lock()); 644 } 645 646 updateTime = true; 647 } 648 649 if ((mask & B_STAT_MODE) != 0) { 650 // only the user or root can do that 651 if (!isOwnerOrRoot) 652 return B_NOT_ALLOWED; 653 node.UpdateMode(stat->st_mode, S_IUMSK); 654 updateTime = true; 655 } 656 657 if ((mask & B_STAT_UID) != 0) { 658 // only root should be allowed 659 if (uid != 0) 660 return B_NOT_ALLOWED; 661 node.SetUserID(stat->st_uid); 662 updateTime = true; 663 } 664 665 if ((mask & B_STAT_GID) != 0) { 666 // only the user or root can do that 667 if (!isOwnerOrRoot) 668 return B_NOT_ALLOWED; 669 node.SetGroupID(stat->st_gid); 670 updateTime = true; 671 } 672 673 if ((mask & B_STAT_MODIFICATION_TIME) != 0 || updateTime 674 || (mask & B_STAT_CHANGE_TIME) != 0) { 675 // the user or root can do that or any user with write access 676 if (!isOwnerOrRoot && !hasWriteAccess) 677 return B_NOT_ALLOWED; 678 struct timespec newTimespec = { 0, 0}; 679 680 if ((mask & B_STAT_MODIFICATION_TIME) != 0) 681 newTimespec = stat->st_mtim; 682 683 if ((mask & B_STAT_CHANGE_TIME) != 0 684 && stat->st_ctim.tv_sec > newTimespec.tv_sec) 685 newTimespec = stat->st_ctim; 686 687 if (newTimespec.tv_sec == 0) 688 Inode::_BigtimeToTimespec(real_time_clock_usecs(), &newTimespec); 689 690 inode->SetModificationTime(&newTimespec); 691 } 692 if ((mask & B_STAT_CREATION_TIME) != 0) { 693 // the user or root can do that or any user with write access 694 if (!isOwnerOrRoot && !hasWriteAccess) 695 return B_NOT_ALLOWED; 696 inode->SetCreationTime(&stat->st_crtim); 697 } 698 699 status_t status = inode->WriteBack(transaction); 700 if (status == B_OK) 701 status = transaction.Done(); 702 if (status == B_OK) 703 notify_stat_changed(volume->ID(), -1, inode->ID(), mask); 704 705 return status; 706 } 707 708 709 static status_t 710 ext2_create(fs_volume* _volume, fs_vnode* _directory, const char* name, 711 int openMode, int mode, void** _cookie, ino_t* _vnodeID) 712 { 713 Volume* volume = (Volume*)_volume->private_volume; 714 Inode* directory = (Inode*)_directory->private_node; 715 716 TRACE("ext2_create()\n"); 717 718 if (volume->IsReadOnly()) 719 return B_READ_ONLY_DEVICE; 720 721 if (!directory->IsDirectory()) 722 return B_BAD_TYPE; 723 724 TRACE("ext2_create(): Creating cookie\n"); 725 726 // Allocate cookie 727 file_cookie* cookie = new(std::nothrow) file_cookie; 728 if (cookie == NULL) 729 return B_NO_MEMORY; 730 ObjectDeleter<file_cookie> cookieDeleter(cookie); 731 732 cookie->open_mode = openMode; 733 cookie->last_size = 0; 734 cookie->last_notification = system_time(); 735 736 TRACE("ext2_create(): Starting transaction\n"); 737 738 Transaction transaction(volume->GetJournal()); 739 740 TRACE("ext2_create(): Creating inode\n"); 741 742 Inode* inode; 743 bool created; 744 status_t status = Inode::Create(transaction, directory, name, 745 S_FILE | (mode & S_IUMSK), openMode, EXT2_TYPE_FILE, &created, _vnodeID, 746 &inode, &gExt2VnodeOps); 747 if (status != B_OK) 748 return status; 749 750 TRACE("ext2_create(): Created inode\n"); 751 752 if ((openMode & O_NOCACHE) != 0) { 753 status = inode->DisableFileCache(); 754 if (status != B_OK) 755 return status; 756 } 757 758 entry_cache_add(volume->ID(), directory->ID(), name, *_vnodeID); 759 760 status = transaction.Done(); 761 if (status != B_OK) { 762 entry_cache_remove(volume->ID(), directory->ID(), name); 763 return status; 764 } 765 766 *_cookie = cookie; 767 cookieDeleter.Detach(); 768 769 if (created) 770 notify_entry_created(volume->ID(), directory->ID(), name, *_vnodeID); 771 772 return B_OK; 773 } 774 775 776 static status_t 777 ext2_create_symlink(fs_volume* _volume, fs_vnode* _directory, const char* name, 778 const char* path, int mode) 779 { 780 TRACE("ext2_create_symlink()\n"); 781 782 Volume* volume = (Volume*)_volume->private_volume; 783 Inode* directory = (Inode*)_directory->private_node; 784 785 if (volume->IsReadOnly()) 786 return B_READ_ONLY_DEVICE; 787 788 if (!directory->IsDirectory()) 789 return B_BAD_TYPE; 790 791 status_t status = directory->CheckPermissions(W_OK); 792 if (status != B_OK) 793 return status; 794 795 TRACE("ext2_create_symlink(): Starting transaction\n"); 796 Transaction transaction(volume->GetJournal()); 797 798 Inode* link; 799 ino_t id; 800 status = Inode::Create(transaction, directory, name, S_SYMLINK | 0777, 801 0, (uint8)EXT2_TYPE_SYMLINK, NULL, &id, &link); 802 if (status != B_OK) 803 return status; 804 805 // TODO: We have to prepare the link before publishing? 806 807 size_t length = strlen(path); 808 TRACE("ext2_create_symlink(): Path (%s) length: %d\n", path, (int)length); 809 if (length < EXT2_SHORT_SYMLINK_LENGTH) { 810 strcpy(link->Node().symlink, path); 811 link->Node().SetSize((uint32)length); 812 } else { 813 if (!link->HasFileCache()) { 814 status = link->CreateFileCache(); 815 if (status != B_OK) 816 return status; 817 } 818 819 size_t written = length; 820 status = link->WriteAt(transaction, 0, (const uint8*)path, &written); 821 if (status == B_OK && written != length) 822 status = B_IO_ERROR; 823 } 824 825 if (status == B_OK) 826 status = link->WriteBack(transaction); 827 828 TRACE("ext2_create_symlink(): Publishing vnode\n"); 829 publish_vnode(volume->FSVolume(), id, link, &gExt2VnodeOps, 830 link->Mode(), 0); 831 put_vnode(volume->FSVolume(), id); 832 833 if (status == B_OK) { 834 entry_cache_add(volume->ID(), directory->ID(), name, id); 835 836 status = transaction.Done(); 837 if (status == B_OK) 838 notify_entry_created(volume->ID(), directory->ID(), name, id); 839 else 840 entry_cache_remove(volume->ID(), directory->ID(), name); 841 } 842 TRACE("ext2_create_symlink(): Done\n"); 843 844 return status; 845 } 846 847 848 static status_t 849 ext2_link(fs_volume* volume, fs_vnode* dir, const char* name, fs_vnode* node) 850 { 851 // TODO 852 853 return B_UNSUPPORTED; 854 } 855 856 857 static status_t 858 ext2_unlink(fs_volume* _volume, fs_vnode* _directory, const char* name) 859 { 860 TRACE("ext2_unlink()\n"); 861 if (strcmp(name, ".") == 0 || strcmp(name, "..") == 0) 862 return B_NOT_ALLOWED; 863 864 Volume* volume = (Volume*)_volume->private_volume; 865 Inode* directory = (Inode*)_directory->private_node; 866 867 status_t status = directory->CheckPermissions(W_OK); 868 if (status != B_OK) 869 return status; 870 871 TRACE("ext2_unlink(): Starting transaction\n"); 872 Transaction transaction(volume->GetJournal()); 873 874 directory->WriteLockInTransaction(transaction); 875 876 TRACE("ext2_unlink(): Looking up for directory entry\n"); 877 HTree htree(volume, directory); 878 DirectoryIterator* directoryIterator; 879 880 status = htree.Lookup(name, &directoryIterator); 881 if (status != B_OK) 882 return status; 883 884 ino_t id; 885 status = directoryIterator->FindEntry(name, &id); 886 if (status != B_OK) 887 return status; 888 889 { 890 Vnode vnode(volume, id); 891 Inode* inode; 892 status = vnode.Get(&inode); 893 if (status != B_OK) 894 return status; 895 896 inode->WriteLockInTransaction(transaction); 897 898 status = inode->Unlink(transaction); 899 if (status != B_OK) 900 return status; 901 902 status = directoryIterator->RemoveEntry(transaction); 903 if (status != B_OK) 904 return status; 905 } 906 entry_cache_remove(volume->ID(), directory->ID(), name); 907 908 status = transaction.Done(); 909 if (status != B_OK) 910 entry_cache_add(volume->ID(), directory->ID(), name, id); 911 else 912 notify_entry_removed(volume->ID(), directory->ID(), name, id); 913 914 return status; 915 } 916 917 918 static status_t 919 ext2_rename(fs_volume* _volume, fs_vnode* _oldDir, const char* oldName, 920 fs_vnode* _newDir, const char* newName) 921 { 922 TRACE("ext2_rename()\n"); 923 924 Volume* volume = (Volume*)_volume->private_volume; 925 Inode* oldDirectory = (Inode*)_oldDir->private_node; 926 Inode* newDirectory = (Inode*)_newDir->private_node; 927 928 if (oldDirectory == newDirectory && strcmp(oldName, newName) == 0) 929 return B_OK; 930 931 Transaction transaction(volume->GetJournal()); 932 933 oldDirectory->WriteLockInTransaction(transaction); 934 if (oldDirectory != newDirectory) 935 newDirectory->WriteLockInTransaction(transaction); 936 937 status_t status = oldDirectory->CheckPermissions(W_OK); 938 if (status == B_OK) 939 status = newDirectory->CheckPermissions(W_OK); 940 if (status != B_OK) 941 return status; 942 943 HTree oldHTree(volume, oldDirectory); 944 DirectoryIterator* oldIterator; 945 946 status = oldHTree.Lookup(oldName, &oldIterator); 947 if (status != B_OK) 948 return status; 949 950 ObjectDeleter<DirectoryIterator> oldIteratorDeleter(oldIterator); 951 952 ino_t oldID; 953 status = oldIterator->FindEntry(oldName, &oldID); 954 if (status != B_OK) 955 return status; 956 957 TRACE("ext2_rename(): found entry to rename\n"); 958 959 if (oldDirectory != newDirectory) { 960 TRACE("ext2_rename(): Different parent directories\n"); 961 CachedBlock cached(volume); 962 963 ino_t parentID = newDirectory->ID(); 964 ino_t oldDirID = oldDirectory->ID(); 965 966 do { 967 Vnode vnode(volume, parentID); 968 Inode* parent; 969 970 status = vnode.Get(&parent); 971 if (status != B_OK) 972 return B_IO_ERROR; 973 974 fsblock_t blockNum; 975 status = parent->FindBlock(0, blockNum); 976 if (status != B_OK) 977 return status; 978 979 const HTreeRoot* data = (const HTreeRoot*)cached.SetTo(blockNum); 980 parentID = data->dotdot.InodeID(); 981 } while (parentID != oldID && parentID != oldDirID 982 && parentID != EXT2_ROOT_NODE); 983 984 if (parentID == oldID) 985 return B_BAD_VALUE; 986 } 987 988 HTree newHTree(volume, newDirectory); 989 DirectoryIterator* newIterator; 990 991 status = newHTree.Lookup(newName, &newIterator); 992 if (status != B_OK) 993 return status; 994 995 TRACE("ext2_rename(): found new directory\n"); 996 997 ObjectDeleter<DirectoryIterator> newIteratorDeleter(newIterator); 998 999 Vnode vnode(volume, oldID); 1000 Inode* inode; 1001 1002 status = vnode.Get(&inode); 1003 if (status != B_OK) 1004 return status; 1005 1006 uint8 fileType; 1007 1008 // TODO: Support all file types? 1009 if (inode->IsDirectory()) 1010 fileType = EXT2_TYPE_DIRECTORY; 1011 else if (inode->IsSymLink()) 1012 fileType = EXT2_TYPE_SYMLINK; 1013 else 1014 fileType = EXT2_TYPE_FILE; 1015 1016 // Add entry in destination directory 1017 ino_t existentID; 1018 status = newIterator->FindEntry(newName, &existentID); 1019 if (status == B_OK) { 1020 TRACE("ext2_rename(): found existing new entry\n"); 1021 if (existentID == oldID) { 1022 // Remove entry in oldID 1023 // return inode->Unlink(); 1024 return B_BAD_VALUE; 1025 } 1026 1027 Vnode vnodeExistent(volume, existentID); 1028 Inode* existent; 1029 1030 if (vnodeExistent.Get(&existent) != B_OK) 1031 return B_NAME_IN_USE; 1032 1033 if (existent->IsDirectory() != inode->IsDirectory()) { 1034 return existent->IsDirectory() ? B_IS_A_DIRECTORY 1035 : B_NOT_A_DIRECTORY; 1036 } 1037 1038 // TODO: Perhaps we have to revert this in case of error? 1039 status = newIterator->ChangeEntry(transaction, oldID, fileType); 1040 if (status != B_OK) 1041 return status; 1042 1043 notify_entry_removed(volume->ID(), newDirectory->ID(), newName, 1044 existentID); 1045 } else if (status == B_ENTRY_NOT_FOUND) { 1046 newIterator->Restart(); 1047 1048 status = newIterator->AddEntry(transaction, newName, strlen(newName), 1049 oldID, fileType); 1050 if (status != B_OK) 1051 return status; 1052 1053 } else 1054 return status; 1055 1056 if (oldDirectory == newDirectory) { 1057 status = oldHTree.Lookup(oldName, &oldIterator); 1058 if (status != B_OK) 1059 return status; 1060 1061 oldIteratorDeleter.SetTo(oldIterator); 1062 status = oldIterator->FindEntry(oldName, &oldID); 1063 if (status != B_OK) 1064 return status; 1065 } 1066 1067 // Remove entry from source folder 1068 status = oldIterator->RemoveEntry(transaction); 1069 if (status != B_OK) 1070 return status; 1071 1072 inode->WriteLockInTransaction(transaction); 1073 1074 if (oldDirectory != newDirectory && inode->IsDirectory()) { 1075 DirectoryIterator inodeIterator(inode); 1076 1077 status = inodeIterator.FindEntry(".."); 1078 if (status == B_ENTRY_NOT_FOUND) { 1079 ERROR("Corrupt file system. Missing \"..\" in directory %" 1080 B_PRIdINO "\n", inode->ID()); 1081 return B_BAD_DATA; 1082 } else if (status != B_OK) 1083 return status; 1084 1085 inodeIterator.ChangeEntry(transaction, newDirectory->ID(), 1086 (uint8)EXT2_TYPE_DIRECTORY); 1087 // Decrement hardlink count on the source folder 1088 status = oldDirectory->Unlink(transaction); 1089 if (status != B_OK) 1090 ERROR("Error while decrementing hardlink count on the source folder\n"); 1091 // Increment hardlink count on the destination folder 1092 newDirectory->IncrementNumLinks(transaction); 1093 status = newDirectory->WriteBack(transaction); 1094 if (status != B_OK) 1095 ERROR("Error while writing back the destination folder inode\n"); 1096 } 1097 1098 status = inode->WriteBack(transaction); 1099 if (status != B_OK) 1100 return status; 1101 1102 entry_cache_remove(volume->ID(), oldDirectory->ID(), oldName); 1103 entry_cache_add(volume->ID(), newDirectory->ID(), newName, oldID); 1104 1105 status = transaction.Done(); 1106 if (status != B_OK) { 1107 entry_cache_remove(volume->ID(), oldDirectory->ID(), newName); 1108 entry_cache_add(volume->ID(), newDirectory->ID(), oldName, oldID); 1109 1110 return status; 1111 } 1112 1113 notify_entry_moved(volume->ID(), oldDirectory->ID(), oldName, 1114 newDirectory->ID(), newName, oldID); 1115 1116 return B_OK; 1117 } 1118 1119 1120 static status_t 1121 ext2_open(fs_volume* _volume, fs_vnode* _node, int openMode, void** _cookie) 1122 { 1123 Volume* volume = (Volume*)_volume->private_volume; 1124 Inode* inode = (Inode*)_node->private_node; 1125 1126 // opening a directory read-only is allowed, although you can't read 1127 // any data from it. 1128 if (inode->IsDirectory() && (openMode & O_RWMASK) != 0) 1129 return B_IS_A_DIRECTORY; 1130 1131 status_t status = inode->CheckPermissions(open_mode_to_access(openMode) 1132 | (openMode & O_TRUNC ? W_OK : 0)); 1133 if (status != B_OK) 1134 return status; 1135 1136 // Prepare the cookie 1137 file_cookie* cookie = new(std::nothrow) file_cookie; 1138 if (cookie == NULL) 1139 return B_NO_MEMORY; 1140 ObjectDeleter<file_cookie> cookieDeleter(cookie); 1141 1142 cookie->open_mode = openMode & EXT2_OPEN_MODE_USER_MASK; 1143 cookie->last_size = inode->Size(); 1144 cookie->last_notification = system_time(); 1145 1146 MethodDeleter<Inode, status_t, &Inode::EnableFileCache> fileCacheEnabler; 1147 if ((openMode & O_NOCACHE) != 0) { 1148 status = inode->DisableFileCache(); 1149 if (status != B_OK) 1150 return status; 1151 fileCacheEnabler.SetTo(inode); 1152 } 1153 1154 // Should we truncate the file? 1155 if ((openMode & O_TRUNC) != 0) { 1156 if ((openMode & O_RWMASK) == O_RDONLY) 1157 return B_NOT_ALLOWED; 1158 1159 Transaction transaction(volume->GetJournal()); 1160 inode->WriteLockInTransaction(transaction); 1161 1162 status_t status = inode->Resize(transaction, 0); 1163 if (status == B_OK) 1164 status = inode->WriteBack(transaction); 1165 if (status == B_OK) 1166 status = transaction.Done(); 1167 if (status != B_OK) 1168 return status; 1169 1170 // TODO: No need to notify file size changed? 1171 } 1172 1173 fileCacheEnabler.Detach(); 1174 cookieDeleter.Detach(); 1175 *_cookie = cookie; 1176 1177 return B_OK; 1178 } 1179 1180 1181 static status_t 1182 ext2_read(fs_volume* _volume, fs_vnode* _node, void* _cookie, off_t pos, 1183 void* buffer, size_t* _length) 1184 { 1185 Inode* inode = (Inode*)_node->private_node; 1186 1187 if (!inode->IsFile()) { 1188 *_length = 0; 1189 return inode->IsDirectory() ? B_IS_A_DIRECTORY : B_BAD_VALUE; 1190 } 1191 1192 return inode->ReadAt(pos, (uint8*)buffer, _length); 1193 } 1194 1195 1196 static status_t 1197 ext2_write(fs_volume* _volume, fs_vnode* _node, void* _cookie, off_t pos, 1198 const void* buffer, size_t* _length) 1199 { 1200 TRACE("ext2_write()\n"); 1201 Volume* volume = (Volume*)_volume->private_volume; 1202 Inode* inode = (Inode*)_node->private_node; 1203 1204 if (volume->IsReadOnly()) 1205 return B_READ_ONLY_DEVICE; 1206 1207 if (inode->IsDirectory()) { 1208 *_length = 0; 1209 return B_IS_A_DIRECTORY; 1210 } 1211 1212 TRACE("ext2_write(): Preparing cookie\n"); 1213 1214 file_cookie* cookie = (file_cookie*)_cookie; 1215 1216 if ((cookie->open_mode & O_APPEND) != 0) 1217 pos = inode->Size(); 1218 1219 TRACE("ext2_write(): Creating transaction\n"); 1220 Transaction transaction; 1221 1222 status_t status = inode->WriteAt(transaction, pos, (const uint8*)buffer, 1223 _length); 1224 if (status == B_OK) 1225 status = transaction.Done(); 1226 if (status == B_OK) { 1227 TRACE("ext2_write(): Finalizing\n"); 1228 ReadLocker lock(*inode->Lock()); 1229 1230 if (cookie->last_size != inode->Size() 1231 && system_time() > cookie->last_notification 1232 + INODE_NOTIFICATION_INTERVAL) { 1233 notify_stat_changed(volume->ID(), -1, inode->ID(), 1234 B_STAT_MODIFICATION_TIME | B_STAT_SIZE | B_STAT_INTERIM_UPDATE); 1235 cookie->last_size = inode->Size(); 1236 cookie->last_notification = system_time(); 1237 } 1238 } 1239 1240 TRACE("ext2_write(): Done\n"); 1241 1242 return status; 1243 } 1244 1245 1246 static status_t 1247 ext2_close(fs_volume *_volume, fs_vnode *_node, void *_cookie) 1248 { 1249 return B_OK; 1250 } 1251 1252 1253 static status_t 1254 ext2_free_cookie(fs_volume* _volume, fs_vnode* _node, void* _cookie) 1255 { 1256 file_cookie* cookie = (file_cookie*)_cookie; 1257 Volume* volume = (Volume*)_volume->private_volume; 1258 Inode* inode = (Inode*)_node->private_node; 1259 1260 if (inode->Size() != cookie->last_size) 1261 notify_stat_changed(volume->ID(), -1, inode->ID(), B_STAT_SIZE); 1262 1263 if ((cookie->open_mode & O_NOCACHE) != 0) 1264 inode->EnableFileCache(); 1265 1266 delete cookie; 1267 return B_OK; 1268 } 1269 1270 1271 static status_t 1272 ext2_access(fs_volume* _volume, fs_vnode* _node, int accessMode) 1273 { 1274 Inode* inode = (Inode*)_node->private_node; 1275 return inode->CheckPermissions(accessMode); 1276 } 1277 1278 1279 static status_t 1280 ext2_read_link(fs_volume *_volume, fs_vnode *_node, char *buffer, 1281 size_t *_bufferSize) 1282 { 1283 Inode* inode = (Inode*)_node->private_node; 1284 1285 if (!inode->IsSymLink()) 1286 return B_BAD_VALUE; 1287 1288 if (inode->Size() > EXT2_SHORT_SYMLINK_LENGTH) { 1289 status_t result = inode->ReadAt(0, reinterpret_cast<uint8*>(buffer), 1290 _bufferSize); 1291 if (result != B_OK) 1292 return result; 1293 } else { 1294 size_t bytesToCopy = std::min(static_cast<size_t>(inode->Size()), 1295 *_bufferSize); 1296 1297 memcpy(buffer, inode->Node().symlink, bytesToCopy); 1298 } 1299 1300 *_bufferSize = inode->Size(); 1301 return B_OK; 1302 } 1303 1304 1305 // #pragma mark - Directory functions 1306 1307 1308 static status_t 1309 ext2_create_dir(fs_volume* _volume, fs_vnode* _directory, const char* name, 1310 int mode) 1311 { 1312 TRACE("ext2_create_dir()\n"); 1313 Volume* volume = (Volume*)_volume->private_volume; 1314 Inode* directory = (Inode*)_directory->private_node; 1315 1316 if (volume->IsReadOnly()) 1317 return B_READ_ONLY_DEVICE; 1318 1319 if (!directory->IsDirectory()) 1320 return B_BAD_TYPE; 1321 1322 status_t status = directory->CheckPermissions(W_OK); 1323 if (status != B_OK) 1324 return status; 1325 1326 TRACE("ext2_create_dir(): Starting transaction\n"); 1327 Transaction transaction(volume->GetJournal()); 1328 1329 ino_t id; 1330 status = Inode::Create(transaction, directory, name, 1331 S_DIRECTORY | (mode & S_IUMSK), 0, EXT2_TYPE_DIRECTORY, NULL, &id); 1332 if (status != B_OK) 1333 return status; 1334 1335 put_vnode(volume->FSVolume(), id); 1336 1337 entry_cache_add(volume->ID(), directory->ID(), name, id); 1338 1339 status = transaction.Done(); 1340 if (status != B_OK) { 1341 entry_cache_remove(volume->ID(), directory->ID(), name); 1342 return status; 1343 } 1344 1345 notify_entry_created(volume->ID(), directory->ID(), name, id); 1346 1347 TRACE("ext2_create_dir(): Done\n"); 1348 1349 return B_OK; 1350 } 1351 1352 1353 static status_t 1354 ext2_remove_dir(fs_volume* _volume, fs_vnode* _directory, const char* name) 1355 { 1356 TRACE("ext2_remove_dir()\n"); 1357 1358 Volume* volume = (Volume*)_volume->private_volume; 1359 Inode* directory = (Inode*)_directory->private_node; 1360 1361 status_t status = directory->CheckPermissions(W_OK); 1362 if (status != B_OK) 1363 return status; 1364 1365 TRACE("ext2_remove_dir(): Starting transaction\n"); 1366 Transaction transaction(volume->GetJournal()); 1367 1368 directory->WriteLockInTransaction(transaction); 1369 1370 TRACE("ext2_remove_dir(): Looking up for directory entry\n"); 1371 HTree htree(volume, directory); 1372 DirectoryIterator* directoryIterator; 1373 1374 status = htree.Lookup(name, &directoryIterator); 1375 if (status != B_OK) 1376 return status; 1377 1378 ino_t id; 1379 status = directoryIterator->FindEntry(name, &id); 1380 if (status != B_OK) 1381 return status; 1382 1383 Vnode vnode(volume, id); 1384 Inode* inode; 1385 status = vnode.Get(&inode); 1386 if (status != B_OK) 1387 return status; 1388 1389 inode->WriteLockInTransaction(transaction); 1390 1391 status = inode->Unlink(transaction); 1392 if (status != B_OK) 1393 return status; 1394 1395 status = directory->Unlink(transaction); 1396 if (status != B_OK) 1397 return status; 1398 1399 status = directoryIterator->RemoveEntry(transaction); 1400 if (status != B_OK) 1401 return status; 1402 1403 entry_cache_remove(volume->ID(), directory->ID(), name); 1404 entry_cache_remove(volume->ID(), id, ".."); 1405 1406 status = transaction.Done(); 1407 if (status != B_OK) { 1408 entry_cache_add(volume->ID(), directory->ID(), name, id); 1409 entry_cache_add(volume->ID(), id, "..", id); 1410 } else 1411 notify_entry_removed(volume->ID(), directory->ID(), name, id); 1412 1413 return status; 1414 } 1415 1416 1417 static status_t 1418 ext2_open_dir(fs_volume* _volume, fs_vnode* _node, void** _cookie) 1419 { 1420 Inode* inode = (Inode*)_node->private_node; 1421 status_t status = inode->CheckPermissions(R_OK); 1422 if (status < B_OK) 1423 return status; 1424 1425 if (!inode->IsDirectory()) 1426 return B_NOT_A_DIRECTORY; 1427 1428 DirectoryIterator* iterator = new(std::nothrow) DirectoryIterator(inode); 1429 if (iterator == NULL) 1430 return B_NO_MEMORY; 1431 1432 *_cookie = iterator; 1433 return B_OK; 1434 } 1435 1436 1437 static status_t 1438 ext2_read_dir(fs_volume *_volume, fs_vnode *_node, void *_cookie, 1439 struct dirent *dirent, size_t bufferSize, uint32 *_num) 1440 { 1441 DirectoryIterator *iterator = (DirectoryIterator *)_cookie; 1442 Volume* volume = (Volume*)_volume->private_volume; 1443 1444 uint32 maxCount = *_num; 1445 uint32 count = 0; 1446 1447 while (count < maxCount && bufferSize > sizeof(struct dirent)) { 1448 1449 size_t length = bufferSize - offsetof(struct dirent, d_name); 1450 ino_t id; 1451 1452 status_t status = iterator->GetNext(dirent->d_name, &length, &id); 1453 if (status == B_ENTRY_NOT_FOUND) 1454 break; 1455 1456 if (status == B_BUFFER_OVERFLOW) { 1457 // the remaining name buffer length was too small 1458 if (count == 0) 1459 return B_BUFFER_OVERFLOW; 1460 break; 1461 } 1462 1463 if (status != B_OK) 1464 return status; 1465 1466 status = iterator->Next(); 1467 if (status != B_OK && status != B_ENTRY_NOT_FOUND) 1468 return status; 1469 1470 dirent->d_dev = volume->ID(); 1471 dirent->d_ino = id; 1472 1473 dirent = next_dirent(dirent, length, bufferSize); 1474 count++; 1475 } 1476 1477 *_num = count; 1478 return B_OK; 1479 } 1480 1481 1482 static status_t 1483 ext2_rewind_dir(fs_volume * /*_volume*/, fs_vnode * /*node*/, void *_cookie) 1484 { 1485 DirectoryIterator *iterator = (DirectoryIterator *)_cookie; 1486 return iterator->Rewind(); 1487 } 1488 1489 1490 static status_t 1491 ext2_close_dir(fs_volume * /*_volume*/, fs_vnode * /*node*/, void * /*_cookie*/) 1492 { 1493 return B_OK; 1494 } 1495 1496 1497 static status_t 1498 ext2_free_dir_cookie(fs_volume *_volume, fs_vnode *_node, void *_cookie) 1499 { 1500 delete (DirectoryIterator*)_cookie; 1501 return B_OK; 1502 } 1503 1504 1505 static status_t 1506 ext2_open_attr_dir(fs_volume *_volume, fs_vnode *_node, void **_cookie) 1507 { 1508 Inode* inode = (Inode*)_node->private_node; 1509 Volume* volume = (Volume*)_volume->private_volume; 1510 TRACE("%s()\n", __FUNCTION__); 1511 1512 if (!(volume->SuperBlock().CompatibleFeatures() & EXT2_FEATURE_EXT_ATTR)) 1513 return ENOSYS; 1514 1515 // on directories too ? 1516 if (!inode->IsFile()) 1517 return EINVAL; 1518 1519 int32 *index = new(std::nothrow) int32; 1520 if (index == NULL) 1521 return B_NO_MEMORY; 1522 *index = 0; 1523 *(int32**)_cookie = index; 1524 return B_OK; 1525 } 1526 1527 static status_t 1528 ext2_close_attr_dir(fs_volume* _volume, fs_vnode* _node, void* cookie) 1529 { 1530 TRACE("%s()\n", __FUNCTION__); 1531 return B_OK; 1532 } 1533 1534 1535 static status_t 1536 ext2_free_attr_dir_cookie(fs_volume* _volume, fs_vnode* _node, void* _cookie) 1537 { 1538 TRACE("%s()\n", __FUNCTION__); 1539 delete (int32 *)_cookie; 1540 return B_OK; 1541 } 1542 1543 1544 static status_t 1545 ext2_read_attr_dir(fs_volume* _volume, fs_vnode* _node, 1546 void* _cookie, struct dirent* dirent, size_t bufferSize, 1547 uint32* _num) 1548 { 1549 Inode* inode = (Inode*)_node->private_node; 1550 int32 index = *(int32 *)_cookie; 1551 Attribute attribute(inode); 1552 TRACE("%s()\n", __FUNCTION__); 1553 1554 size_t length = bufferSize; 1555 status_t status = attribute.Find(index); 1556 if (status == B_ENTRY_NOT_FOUND) { 1557 *_num = 0; 1558 return B_OK; 1559 } else if (status != B_OK) 1560 return status; 1561 1562 status = attribute.GetName(dirent->d_name, &length); 1563 if (status != B_OK) 1564 return B_OK; 1565 1566 Volume* volume = (Volume*)_volume->private_volume; 1567 1568 dirent->d_dev = volume->ID(); 1569 dirent->d_ino = inode->ID(); 1570 dirent->d_reclen = offsetof(struct dirent, d_name) + length + 1; 1571 1572 *_num = 1; 1573 *(int32*)_cookie = index + 1; 1574 return B_OK; 1575 } 1576 1577 1578 static status_t 1579 ext2_rewind_attr_dir(fs_volume* _volume, fs_vnode* _node, void* _cookie) 1580 { 1581 *(int32*)_cookie = 0; 1582 TRACE("%s()\n", __FUNCTION__); 1583 return B_OK; 1584 } 1585 1586 1587 /* attribute operations */ 1588 static status_t 1589 ext2_open_attr(fs_volume* _volume, fs_vnode* _node, const char* name, 1590 int openMode, void** _cookie) 1591 { 1592 TRACE("%s()\n", __FUNCTION__); 1593 1594 Volume* volume = (Volume*)_volume->private_volume; 1595 Inode* inode = (Inode*)_node->private_node; 1596 Attribute attribute(inode); 1597 1598 if (!(volume->SuperBlock().CompatibleFeatures() & EXT2_FEATURE_EXT_ATTR)) 1599 return ENOSYS; 1600 1601 return attribute.Open(name, openMode, (attr_cookie**)_cookie); 1602 } 1603 1604 1605 static status_t 1606 ext2_close_attr(fs_volume* _volume, fs_vnode* _node, 1607 void* cookie) 1608 { 1609 return B_OK; 1610 } 1611 1612 1613 static status_t 1614 ext2_free_attr_cookie(fs_volume* _volume, fs_vnode* _node, 1615 void* cookie) 1616 { 1617 delete (attr_cookie*)cookie; 1618 return B_OK; 1619 } 1620 1621 1622 static status_t 1623 ext2_read_attr(fs_volume* _volume, fs_vnode* _node, void* _cookie, 1624 off_t pos, void* buffer, size_t* _length) 1625 { 1626 TRACE("%s()\n", __FUNCTION__); 1627 1628 attr_cookie* cookie = (attr_cookie*)_cookie; 1629 Inode* inode = (Inode*)_node->private_node; 1630 1631 Attribute attribute(inode, cookie); 1632 1633 return attribute.Read(cookie, pos, (uint8*)buffer, _length); 1634 } 1635 1636 1637 static status_t 1638 ext2_read_attr_stat(fs_volume* _volume, fs_vnode* _node, 1639 void* _cookie, struct stat* stat) 1640 { 1641 attr_cookie* cookie = (attr_cookie*)_cookie; 1642 Inode* inode = (Inode*)_node->private_node; 1643 1644 Attribute attribute(inode, cookie); 1645 1646 return attribute.Stat(*stat); 1647 } 1648 1649 1650 fs_volume_ops gExt2VolumeOps = { 1651 &ext2_unmount, 1652 &ext2_read_fs_info, 1653 &ext2_write_fs_info, 1654 &ext2_sync, 1655 &ext2_get_vnode, 1656 }; 1657 1658 1659 fs_vnode_ops gExt2VnodeOps = { 1660 /* vnode operations */ 1661 &ext2_lookup, 1662 NULL, 1663 &ext2_put_vnode, 1664 &ext2_remove_vnode, 1665 1666 /* VM file access */ 1667 &ext2_can_page, 1668 &ext2_read_pages, 1669 &ext2_write_pages, 1670 1671 NULL, // io() 1672 NULL, // cancel_io() 1673 1674 &ext2_get_file_map, 1675 1676 &ext2_ioctl, 1677 NULL, 1678 NULL, // fs_select 1679 NULL, // fs_deselect 1680 &ext2_fsync, 1681 1682 &ext2_read_link, 1683 &ext2_create_symlink, 1684 1685 &ext2_link, 1686 &ext2_unlink, 1687 &ext2_rename, 1688 1689 &ext2_access, 1690 &ext2_read_stat, 1691 &ext2_write_stat, 1692 NULL, // fs_preallocate 1693 1694 /* file operations */ 1695 &ext2_create, 1696 &ext2_open, 1697 &ext2_close, 1698 &ext2_free_cookie, 1699 &ext2_read, 1700 &ext2_write, 1701 1702 /* directory operations */ 1703 &ext2_create_dir, 1704 &ext2_remove_dir, 1705 &ext2_open_dir, 1706 &ext2_close_dir, 1707 &ext2_free_dir_cookie, 1708 &ext2_read_dir, 1709 &ext2_rewind_dir, 1710 1711 /* attribute directory operations */ 1712 &ext2_open_attr_dir, 1713 &ext2_close_attr_dir, 1714 &ext2_free_attr_dir_cookie, 1715 &ext2_read_attr_dir, 1716 &ext2_rewind_attr_dir, 1717 1718 /* attribute operations */ 1719 NULL, 1720 &ext2_open_attr, 1721 &ext2_close_attr, 1722 &ext2_free_attr_cookie, 1723 &ext2_read_attr, 1724 NULL, 1725 &ext2_read_attr_stat, 1726 NULL, 1727 NULL, 1728 NULL, 1729 }; 1730 1731 1732 static file_system_module_info sExt2FileSystem = { 1733 { 1734 "file_systems/ext2" B_CURRENT_FS_API_VERSION, 1735 0, 1736 NULL, 1737 }, 1738 1739 "ext2", // short_name 1740 "Ext2 File System", // pretty_name 1741 B_DISK_SYSTEM_SUPPORTS_WRITING 1742 | B_DISK_SYSTEM_SUPPORTS_CONTENT_NAME, // DDM flags 1743 1744 // scanning 1745 ext2_identify_partition, 1746 ext2_scan_partition, 1747 ext2_free_identify_partition_cookie, 1748 NULL, // free_partition_content_cookie() 1749 1750 &ext2_mount, 1751 1752 NULL, 1753 }; 1754 1755 1756 module_info *modules[] = { 1757 (module_info *)&sExt2FileSystem, 1758 NULL, 1759 }; 1760