1 /* 2 * COPYRIGHT: See COPYRIGHT.TXT 3 * PROJECT: Ext2 File System Driver for WinNT/2K/XP 4 * FILE: memory.c 5 * PROGRAMMER: Matt Wu <mattwu@163.com> 6 * HOMEPAGE: http://www.ext2fsd.com 7 * UPDATE HISTORY: 8 */ 9 10 /* INCLUDES *****************************************************************/ 11 12 #include "ext2fs.h" 13 14 /* GLOBALS ***************************************************************/ 15 16 extern PEXT2_GLOBAL Ext2Global; 17 18 /* DEFINITIONS *************************************************************/ 19 20 #ifdef ALLOC_PRAGMA 21 #pragma alloc_text(PAGE, Ext2AllocateInode) 22 #pragma alloc_text(PAGE, Ext2DestroyInode) 23 #pragma alloc_text(PAGE, Ext2CheckBitmapConsistency) 24 #pragma alloc_text(PAGE, Ext2CheckSetBlock) 25 #pragma alloc_text(PAGE, Ext2InitializeVcb) 26 #pragma alloc_text(PAGE, Ext2TearDownStream) 27 #pragma alloc_text(PAGE, Ext2DestroyVcb) 28 #pragma alloc_text(PAGE, Ext2SyncUninitializeCacheMap) 29 #pragma alloc_text(PAGE, Ext2ReaperThread) 30 #pragma alloc_text(PAGE, Ext2StartReaper) 31 #pragma alloc_text(PAGE, Ext2StopReaper) 32 #endif 33 34 PEXT2_IRP_CONTEXT 35 Ext2AllocateIrpContext (IN PDEVICE_OBJECT DeviceObject, 36 IN PIRP Irp ) 37 { 38 PIO_STACK_LOCATION irpSp; 39 PEXT2_IRP_CONTEXT IrpContext; 40 41 ASSERT(DeviceObject != NULL); 42 ASSERT(Irp != NULL); 43 44 irpSp = IoGetCurrentIrpStackLocation(Irp); 45 46 IrpContext = (PEXT2_IRP_CONTEXT) ( 47 ExAllocateFromNPagedLookasideList( 48 &(Ext2Global->Ext2IrpContextLookasideList))); 49 50 if (IrpContext == NULL) { 51 return NULL; 52 } 53 54 RtlZeroMemory(IrpContext, sizeof(EXT2_IRP_CONTEXT) ); 55 56 IrpContext->Identifier.Type = EXT2ICX; 57 IrpContext->Identifier.Size = sizeof(EXT2_IRP_CONTEXT); 58 59 IrpContext->Irp = Irp; 60 IrpContext->MajorFunction = irpSp->MajorFunction; 61 IrpContext->MinorFunction = irpSp->MinorFunction; 62 IrpContext->DeviceObject = DeviceObject; 63 IrpContext->FileObject = irpSp->FileObject; 64 if (NULL != IrpContext->FileObject) { 65 IrpContext->Fcb = (PEXT2_FCB)IrpContext->FileObject->FsContext; 66 IrpContext->Ccb = (PEXT2_CCB)IrpContext->FileObject->FsContext2; 67 } 68 69 if (IrpContext->FileObject != NULL) { 70 IrpContext->RealDevice = IrpContext->FileObject->DeviceObject; 71 } else if (IrpContext->MajorFunction == IRP_MJ_FILE_SYSTEM_CONTROL) { 72 if (irpSp->Parameters.MountVolume.Vpb) { 73 IrpContext->RealDevice = irpSp->Parameters.MountVolume.Vpb->RealDevice; 74 } 75 } 76 77 if (IsFlagOn(irpSp->Flags, SL_WRITE_THROUGH)) { 78 SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_THROUGH); 79 } 80 81 if (IsFlagOn(irpSp->Flags, SL_OVERRIDE_VERIFY_VOLUME)) { 82 SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_VERIFY_READ); 83 } 84 85 if (IrpContext->MajorFunction == IRP_MJ_CLEANUP || 86 IrpContext->MajorFunction == IRP_MJ_CLOSE || 87 IrpContext->MajorFunction == IRP_MJ_SHUTDOWN || 88 IrpContext->MajorFunction == IRP_MJ_FILE_SYSTEM_CONTROL || 89 IrpContext->MajorFunction == IRP_MJ_PNP ) { 90 91 if (IrpContext->MajorFunction == IRP_MJ_FILE_SYSTEM_CONTROL || 92 IrpContext->MajorFunction == IRP_MJ_PNP) { 93 if (IoGetCurrentIrpStackLocation(Irp)->FileObject == NULL || 94 IoIsOperationSynchronous(Irp)) { 95 SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT); 96 } 97 } else { 98 SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT); 99 } 100 101 } else if (IoIsOperationSynchronous(Irp)) { 102 103 SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT); 104 } 105 106 IrpContext->IsTopLevel = (IoGetTopLevelIrp() == Irp); 107 IrpContext->ExceptionInProgress = FALSE; 108 INC_IRP_COUNT(IrpContext); 109 110 return IrpContext; 111 } 112 113 VOID 114 Ext2FreeIrpContext (IN PEXT2_IRP_CONTEXT IrpContext) 115 { 116 ASSERT(IrpContext != NULL); 117 118 ASSERT((IrpContext->Identifier.Type == EXT2ICX) && 119 (IrpContext->Identifier.Size == sizeof(EXT2_IRP_CONTEXT))); 120 121 /* free the IrpContext to NonPagedList */ 122 IrpContext->Identifier.Type = 0; 123 IrpContext->Identifier.Size = 0; 124 125 DEC_IRP_COUNT(IrpContext); 126 ExFreeToNPagedLookasideList(&(Ext2Global->Ext2IrpContextLookasideList), IrpContext); 127 } 128 129 130 PEXT2_FCB 131 Ext2AllocateFcb ( 132 IN PEXT2_VCB Vcb, 133 IN PEXT2_MCB Mcb 134 ) 135 { 136 PEXT2_FCB Fcb; 137 138 ASSERT(ExIsResourceAcquiredExclusiveLite(&Vcb->FcbLock)); 139 140 Fcb = (PEXT2_FCB) ExAllocateFromNPagedLookasideList( 141 &(Ext2Global->Ext2FcbLookasideList)); 142 143 if (!Fcb) { 144 return NULL; 145 } 146 147 RtlZeroMemory(Fcb, sizeof(EXT2_FCB)); 148 Fcb->Identifier.Type = EXT2FCB; 149 Fcb->Identifier.Size = sizeof(EXT2_FCB); 150 151 #ifndef _WIN2K_TARGET_ 152 ExInitializeFastMutex(&Fcb->Mutex); 153 FsRtlSetupAdvancedHeader(&Fcb->Header, &Fcb->Mutex); 154 #endif 155 156 FsRtlInitializeOplock(&Fcb->Oplock); 157 FsRtlInitializeFileLock ( 158 &Fcb->FileLockAnchor, 159 NULL, 160 NULL ); 161 162 Fcb->OpenHandleCount = 0; 163 Fcb->ReferenceCount = 0; 164 Fcb->Vcb = Vcb; 165 Fcb->Inode = &Mcb->Inode; 166 167 ASSERT(Mcb->Fcb == NULL); 168 Ext2ReferMcb(Mcb); 169 Fcb->Mcb = Mcb; 170 Mcb->Fcb = Fcb; 171 172 DEBUG(DL_RES, ("Ext2AllocateFcb: Fcb %p created: %wZ.\n", 173 Fcb, &Fcb->Mcb->FullName)); 174 175 RtlZeroMemory(&Fcb->Header, sizeof(FSRTL_COMMON_FCB_HEADER)); 176 Fcb->Header.NodeTypeCode = (USHORT) EXT2FCB; 177 Fcb->Header.NodeByteSize = sizeof(EXT2_FCB); 178 Fcb->Header.IsFastIoPossible = FastIoIsNotPossible; 179 Fcb->Header.Resource = &(Fcb->MainResource); 180 Fcb->Header.PagingIoResource = &(Fcb->PagingIoResource); 181 182 Fcb->Header.FileSize.QuadPart = Mcb->Inode.i_size; 183 Fcb->Header.ValidDataLength.QuadPart = Mcb->Inode.i_size; 184 Fcb->Header.AllocationSize.QuadPart = CEILING_ALIGNED(ULONGLONG, 185 Fcb->Header.FileSize.QuadPart, (ULONGLONG)Vcb->BlockSize); 186 187 Fcb->SectionObject.DataSectionObject = NULL; 188 Fcb->SectionObject.SharedCacheMap = NULL; 189 Fcb->SectionObject.ImageSectionObject = NULL; 190 191 ExInitializeResourceLite(&(Fcb->MainResource)); 192 ExInitializeResourceLite(&(Fcb->PagingIoResource)); 193 194 Ext2InsertFcb(Vcb, Fcb); 195 196 INC_MEM_COUNT(PS_FCB, Fcb, sizeof(EXT2_FCB)); 197 198 return Fcb; 199 } 200 201 VOID 202 Ext2UnlinkFcb(IN PEXT2_FCB Fcb) 203 { 204 PEXT2_VCB Vcb = Fcb->Vcb; 205 PEXT2_MCB Mcb; 206 207 ExAcquireResourceExclusiveLite(&Vcb->McbLock, TRUE); 208 Mcb = Fcb->Mcb; 209 210 DEBUG(DL_INF, ("Ext2FreeFcb: Fcb (%p) to be unlinked: %wZ.\n", 211 Fcb, Mcb ? &Mcb->FullName : NULL)); 212 213 if ((Mcb != NULL) && 214 (Mcb->Identifier.Type == EXT2MCB) && 215 (Mcb->Identifier.Size == sizeof(EXT2_MCB))) { 216 217 ASSERT (Mcb->Fcb == Fcb); 218 if (IsMcbSpecialFile(Mcb) || 219 IsFileDeleted(Mcb)) { 220 221 ASSERT(!IsRoot(Fcb)); 222 Ext2RemoveMcb(Vcb, Mcb); 223 Mcb->Fcb = NULL; 224 225 Ext2UnlinkMcb(Vcb, Mcb); 226 Ext2DerefMcb(Mcb); 227 Ext2LinkHeadMcb(Vcb, Mcb); 228 229 } else { 230 Mcb->Fcb = NULL; 231 Ext2DerefMcb(Mcb); 232 } 233 Fcb->Mcb = NULL; 234 } 235 236 ExReleaseResourceLite(&Vcb->McbLock); 237 } 238 239 VOID 240 Ext2FreeFcb (IN PEXT2_FCB Fcb) 241 { 242 PEXT2_VCB Vcb = Fcb->Vcb; 243 244 _SEH2_TRY { 245 246 ASSERT((Fcb != NULL) && (Fcb->Identifier.Type == EXT2FCB) && 247 (Fcb->Identifier.Size == sizeof(EXT2_FCB))); 248 ASSERT(0 == Fcb->ReferenceCount); 249 250 #ifndef _WIN2K_TARGET_ 251 FsRtlTeardownPerStreamContexts(&Fcb->Header); 252 #endif 253 254 FsRtlUninitializeFileLock(&Fcb->FileLockAnchor); 255 FsRtlUninitializeOplock(&Fcb->Oplock); 256 ExDeleteResourceLite(&Fcb->MainResource); 257 ExDeleteResourceLite(&Fcb->PagingIoResource); 258 259 Fcb->Identifier.Type = 0; 260 Fcb->Identifier.Size = 0; 261 262 ExFreeToNPagedLookasideList(&(Ext2Global->Ext2FcbLookasideList), Fcb); 263 DEC_MEM_COUNT(PS_FCB, Fcb, sizeof(EXT2_FCB)); 264 265 if (0 == Ext2DerefXcb(&Vcb->ReferenceCount)) { 266 if (!IsMounted(Vcb) || IsDispending(Vcb)) { 267 Ext2CheckDismount(NULL, Vcb, FALSE); 268 } 269 } 270 271 } _SEH2_FINALLY { 272 } _SEH2_END; 273 } 274 275 VOID 276 Ext2ReleaseFcb (IN PEXT2_FCB Fcb) 277 { 278 PEXT2_VCB Vcb = Fcb->Vcb; 279 PEXT2_MCB Mcb; 280 281 if (0 != Ext2DerefXcb(&Fcb->ReferenceCount)) 282 return; 283 284 ExAcquireResourceExclusiveLite(&Vcb->FcbLock, TRUE); 285 ExAcquireResourceExclusiveLite(&Fcb->MainResource, TRUE); 286 287 Mcb = Fcb->Mcb; 288 RemoveEntryList(&Fcb->Next); 289 290 if (IsFlagOn(Fcb->Flags, FCB_DELETE_PENDING) || 291 NULL == Mcb || IsFileDeleted(Mcb)) { 292 InsertHeadList(&Vcb->FcbList, &Fcb->Next); 293 Fcb->TsDrop.QuadPart = 0; 294 } else { 295 InsertTailList(&Vcb->FcbList, &Fcb->Next); 296 KeQuerySystemTime(&Fcb->TsDrop); 297 } 298 ExReleaseResourceLite(&Fcb->MainResource); 299 ExReleaseResourceLite(&Vcb->FcbLock); 300 301 if ((Vcb->FcbCount >> 6) > (ULONG)(Ext2Global->MaxDepth)) { 302 KeSetEvent(&Ext2Global->FcbReaper.Wait, 0, FALSE); 303 } 304 } 305 306 /* Insert Fcb to Vcb->FcbList queue, with Vcb->FcbLock Acquired. */ 307 308 VOID 309 Ext2InsertFcb(PEXT2_VCB Vcb, PEXT2_FCB Fcb) 310 { 311 ASSERT(ExIsResourceAcquiredExclusiveLite(&Vcb->FcbLock)); 312 313 KeQuerySystemTime(&Fcb->TsDrop); 314 Ext2ReferXcb(&Vcb->FcbCount); 315 Ext2ReferXcb(&Vcb->ReferenceCount); 316 InsertTailList(&Vcb->FcbList, &Fcb->Next); 317 } 318 319 PEXT2_CCB 320 Ext2AllocateCcb (ULONG Flags, PEXT2_MCB SymLink) 321 { 322 PEXT2_CCB Ccb; 323 324 Ccb = (PEXT2_CCB) (ExAllocateFromNPagedLookasideList( 325 &(Ext2Global->Ext2CcbLookasideList))); 326 if (!Ccb) { 327 return NULL; 328 } 329 330 DEBUG(DL_RES, ( "ExtAllocateCcb: Ccb created: %ph.\n", Ccb)); 331 332 RtlZeroMemory(Ccb, sizeof(EXT2_CCB)); 333 334 Ccb->Identifier.Type = EXT2CCB; 335 Ccb->Identifier.Size = sizeof(EXT2_CCB); 336 Ccb->Flags = Flags; 337 338 Ccb->SymLink = SymLink; 339 if (SymLink) { 340 ASSERT(SymLink->Refercount > 0); 341 Ext2ReferMcb(SymLink); 342 DEBUG(DL_INF, ( "ExtAllocateCcb: Ccb SymLink: %wZ.\n", 343 &Ccb->SymLink->FullName)); 344 } 345 346 Ccb->DirectorySearchPattern.Length = 0; 347 Ccb->DirectorySearchPattern.MaximumLength = 0; 348 Ccb->DirectorySearchPattern.Buffer = 0; 349 350 INC_MEM_COUNT(PS_CCB, Ccb, sizeof(EXT2_CCB)); 351 352 return Ccb; 353 } 354 355 VOID 356 Ext2FreeCcb (IN PEXT2_VCB Vcb, IN PEXT2_CCB Ccb) 357 { 358 ASSERT(Ccb != NULL); 359 ASSERT((Ccb->Identifier.Type == EXT2CCB) && 360 (Ccb->Identifier.Size == sizeof(EXT2_CCB))); 361 362 DEBUG(DL_RES, ( "Ext2FreeCcb: Ccb = %ph.\n", Ccb)); 363 364 if (Ccb->SymLink) { 365 DEBUG(DL_INF, ( "Ext2FreeCcb: Ccb SymLink: %wZ.\n", 366 &Ccb->SymLink->FullName)); 367 if (IsFileDeleted(Ccb->SymLink->Target)) { 368 Ext2UnlinkMcb(Vcb, Ccb->SymLink); 369 Ext2DerefMcb(Ccb->SymLink); 370 Ext2LinkHeadMcb(Vcb, Ccb->SymLink); 371 } else { 372 Ext2DerefMcb(Ccb->SymLink); 373 } 374 } 375 376 if (Ccb->DirectorySearchPattern.Buffer != NULL) { 377 DEC_MEM_COUNT(PS_DIR_PATTERN, Ccb->DirectorySearchPattern.Buffer, 378 Ccb->DirectorySearchPattern.MaximumLength ); 379 Ext2FreePool(Ccb->DirectorySearchPattern.Buffer, EXT2_DIRSP_MAGIC); 380 } 381 382 ExFreeToNPagedLookasideList(&(Ext2Global->Ext2CcbLookasideList), Ccb); 383 DEC_MEM_COUNT(PS_CCB, Ccb, sizeof(EXT2_CCB)); 384 } 385 386 PEXT2_INODE 387 Ext2AllocateInode (PEXT2_VCB Vcb) 388 { 389 PVOID inode = NULL; 390 391 inode = ExAllocateFromNPagedLookasideList( 392 &(Vcb->InodeLookasideList)); 393 if (!inode) { 394 return NULL; 395 } 396 397 RtlZeroMemory(inode, INODE_SIZE); 398 399 DEBUG(DL_INF, ("ExtAllocateInode: Inode created: %ph.\n", inode)); 400 INC_MEM_COUNT(PS_EXT2_INODE, inode, INODE_SIZE); 401 402 return inode; 403 } 404 405 VOID 406 Ext2DestroyInode (IN PEXT2_VCB Vcb, IN PEXT2_INODE inode) 407 { 408 ASSERT(inode != NULL); 409 410 DEBUG(DL_INF, ("Ext2FreeInode: Inode = %ph.\n", inode)); 411 412 ExFreeToNPagedLookasideList(&(Vcb->InodeLookasideList), inode); 413 DEC_MEM_COUNT(PS_EXT2_INODE, inode, INODE_SIZE); 414 } 415 416 struct dentry * Ext2AllocateEntry() 417 { 418 struct dentry *de; 419 420 de = (struct dentry *)ExAllocateFromNPagedLookasideList( 421 &(Ext2Global->Ext2DentryLookasideList)); 422 if (!de) { 423 return NULL; 424 } 425 426 RtlZeroMemory(de, sizeof(struct dentry)); 427 INC_MEM_COUNT(PS_DENTRY, de, sizeof(struct dentry)); 428 429 return de; 430 } 431 432 VOID Ext2FreeEntry (IN struct dentry *de) 433 { 434 ASSERT(de != NULL); 435 436 if (de->d_name.name) 437 ExFreePool(de->d_name.name); 438 439 ExFreeToNPagedLookasideList(&(Ext2Global->Ext2DentryLookasideList), de); 440 DEC_MEM_COUNT(PS_DENTRY, de, sizeof(struct dentry)); 441 } 442 443 444 struct dentry *Ext2BuildEntry(PEXT2_VCB Vcb, PEXT2_MCB Dcb, PUNICODE_STRING FileName) 445 { 446 OEM_STRING Oem = { 0 }; 447 struct dentry *de = NULL; 448 NTSTATUS Status = STATUS_INSUFFICIENT_RESOURCES; 449 450 _SEH2_TRY { 451 452 de = Ext2AllocateEntry(); 453 if (!de) { 454 DEBUG(DL_ERR, ("Ext2BuildEntry: failed to allocate dentry.\n")); 455 _SEH2_LEAVE; 456 } 457 de->d_sb = &Vcb->sb; 458 if (Dcb) 459 de->d_parent = Dcb->de; 460 461 Oem.MaximumLength = (USHORT)Ext2UnicodeToOEMSize(Vcb, FileName) + 1; 462 Oem.Buffer = ExAllocatePool(PagedPool, Oem.MaximumLength); 463 if (!Oem.Buffer) { 464 DEBUG(DL_ERR, ( "Ex2BuildEntry: failed to allocate OEM name.\n")); 465 _SEH2_LEAVE; 466 } 467 de->d_name.name = Oem.Buffer; 468 RtlZeroMemory(Oem.Buffer, Oem.MaximumLength); 469 Status = Ext2UnicodeToOEM(Vcb, &Oem, FileName); 470 if (!NT_SUCCESS(Status)) { 471 DEBUG(DL_CP, ("Ext2BuildEntry: failed to convert %S to OEM.\n", FileName->Buffer)); 472 _SEH2_LEAVE; 473 } 474 de->d_name.len = Oem.Length; 475 476 } _SEH2_FINALLY { 477 478 if (!NT_SUCCESS(Status)) { 479 if (de) 480 Ext2FreeEntry(de); 481 } 482 } _SEH2_END; 483 484 return de; 485 } 486 487 PEXT2_EXTENT 488 Ext2AllocateExtent () 489 { 490 PEXT2_EXTENT Extent; 491 492 Extent = (PEXT2_EXTENT)ExAllocateFromNPagedLookasideList( 493 &(Ext2Global->Ext2ExtLookasideList)); 494 if (!Extent) { 495 return NULL; 496 } 497 498 RtlZeroMemory(Extent, sizeof(EXT2_EXTENT)); 499 INC_MEM_COUNT(PS_EXTENT, Extent, sizeof(EXT2_EXTENT)); 500 501 return Extent; 502 } 503 504 VOID 505 Ext2FreeExtent (IN PEXT2_EXTENT Extent) 506 { 507 ASSERT(Extent != NULL); 508 ExFreeToNPagedLookasideList(&(Ext2Global->Ext2ExtLookasideList), Extent); 509 DEC_MEM_COUNT(PS_EXTENT, Extent, sizeof(EXT2_EXTENT)); 510 } 511 512 ULONG 513 Ext2CountExtents(IN PEXT2_EXTENT Chain) 514 { 515 ULONG count = 0; 516 PEXT2_EXTENT List = Chain; 517 518 while (List) { 519 count += 1; 520 List = List->Next; 521 } 522 523 return count; 524 } 525 526 VOID 527 Ext2JointExtents( 528 IN PEXT2_EXTENT Chain, 529 IN PEXT2_EXTENT Extent 530 ) 531 { 532 #ifndef __REACTOS__ 533 ULONG count = 0; 534 #endif 535 PEXT2_EXTENT List = Chain; 536 537 while (List->Next) { 538 List = List->Next; 539 } 540 541 List->Next = Extent; 542 } 543 544 545 VOID 546 Ext2DestroyExtentChain(IN PEXT2_EXTENT Chain) 547 { 548 PEXT2_EXTENT Extent = NULL, List = Chain; 549 550 while (List) { 551 Extent = List->Next; 552 Ext2FreeExtent(List); 553 List = Extent; 554 } 555 } 556 557 BOOLEAN 558 Ext2ListExtents(PLARGE_MCB Extents) 559 { 560 if (FsRtlNumberOfRunsInLargeMcb(Extents) != 0) { 561 562 LONGLONG DirtyVba; 563 LONGLONG DirtyLba; 564 LONGLONG DirtyLength; 565 int i, n = 0; 566 567 for (i = 0; FsRtlGetNextLargeMcbEntry( 568 Extents, i, &DirtyVba, 569 &DirtyLba, &DirtyLength); i++) { 570 if (DirtyVba > 0 && DirtyLba != -1) { 571 DEBUG(DL_EXT, ("Vba:%I64xh Lba:%I64xh Len:%I64xh.\n", DirtyVba, DirtyLba, DirtyLength)); 572 n++; 573 } 574 } 575 576 return n ? TRUE : FALSE; 577 } 578 579 return FALSE; 580 } 581 582 VOID 583 Ext2CheckExtent( 584 PLARGE_MCB Zone, 585 LONGLONG Vbn, 586 LONGLONG Lbn, 587 LONGLONG Length, 588 BOOLEAN bAdded 589 ) 590 { 591 #if EXT2_DEBUG 592 LONGLONG DirtyLbn; 593 LONGLONG DirtyLen; 594 LONGLONG RunStart; 595 LONGLONG RunLength; 596 ULONG Index; 597 BOOLEAN bFound = FALSE; 598 599 bFound = FsRtlLookupLargeMcbEntry( 600 Zone, 601 Vbn, 602 &DirtyLbn, 603 &DirtyLen, 604 &RunStart, 605 &RunLength, 606 &Index ); 607 608 if (!bAdded && (!bFound || DirtyLbn == -1)) { 609 return; 610 } 611 612 if ( !bFound || (DirtyLbn == -1) || 613 (DirtyLbn != Lbn) || 614 (DirtyLen < Length)) { 615 616 DbgBreak(); 617 618 for (Index = 0; TRUE; Index++) { 619 620 if (!FsRtlGetNextLargeMcbEntry( 621 Zone, 622 Index, 623 &Vbn, 624 &Lbn, 625 &Length)) { 626 break; 627 } 628 629 DEBUG(DL_EXT, ("Index = %xh Vbn = %I64xh Lbn = %I64xh Len = %I64xh\n", 630 Index, Vbn, Lbn, Length )); 631 } 632 } 633 #endif 634 } 635 636 VOID 637 Ext2ClearAllExtents(PLARGE_MCB Zone) 638 { 639 _SEH2_TRY { 640 FsRtlTruncateLargeMcb(Zone, (LONGLONG)0); 641 } _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) { 642 DbgBreak(); 643 } _SEH2_END; 644 } 645 646 647 BOOLEAN 648 Ext2AddVcbExtent ( 649 IN PEXT2_VCB Vcb, 650 IN LONGLONG Vbn, 651 IN LONGLONG Length 652 ) 653 { 654 ULONG TriedTimes = 0; 655 656 LONGLONG Offset = 0; 657 BOOLEAN rc = FALSE; 658 659 Offset = Vbn & (~(Vcb->IoUnitSize - 1)); 660 Length = (Vbn - Offset + Length + Vcb->IoUnitSize - 1) & 661 ~(Vcb->IoUnitSize - 1); 662 663 ASSERT ((Offset & (Vcb->IoUnitSize - 1)) == 0); 664 ASSERT ((Length & (Vcb->IoUnitSize - 1)) == 0); 665 666 Offset = (Offset >> Vcb->IoUnitBits) + 1; 667 Length = (Length >> Vcb->IoUnitBits); 668 669 Again: 670 671 _SEH2_TRY { 672 rc = FsRtlAddLargeMcbEntry( 673 &Vcb->Extents, 674 Offset, 675 Offset, 676 Length 677 ); 678 } _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) { 679 DbgBreak(); 680 rc = FALSE; 681 } _SEH2_END; 682 683 if (!rc && ++TriedTimes < 10) { 684 Ext2Sleep(TriedTimes * 100); 685 goto Again; 686 } 687 688 DEBUG(DL_EXT, ("Ext2AddVcbExtent: Vbn=%I64xh Length=%I64xh," 689 " rc=%d Runs=%u\n", Offset, Length, rc, 690 FsRtlNumberOfRunsInLargeMcb(&Vcb->Extents))); 691 692 if (rc) { 693 Ext2CheckExtent(&Vcb->Extents, Offset, Offset, Length, TRUE); 694 } 695 696 return rc; 697 } 698 699 BOOLEAN 700 Ext2RemoveVcbExtent ( 701 IN PEXT2_VCB Vcb, 702 IN LONGLONG Vbn, 703 IN LONGLONG Length 704 ) 705 { 706 ULONG TriedTimes = 0; 707 LONGLONG Offset = 0; 708 BOOLEAN rc = TRUE; 709 710 Offset = Vbn & (~(Vcb->IoUnitSize - 1)); 711 Length = (Length + Vbn - Offset + Vcb->IoUnitSize - 1) & (~(Vcb->IoUnitSize - 1)); 712 713 ASSERT ((Offset & (Vcb->IoUnitSize - 1)) == 0); 714 ASSERT ((Length & (Vcb->IoUnitSize - 1)) == 0); 715 716 Offset = (Offset >> Vcb->IoUnitBits) + 1; 717 Length = (Length >> Vcb->IoUnitBits); 718 719 Again: 720 721 _SEH2_TRY { 722 FsRtlRemoveLargeMcbEntry( 723 &Vcb->Extents, 724 Offset, 725 Length 726 ); 727 } _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) { 728 DbgBreak(); 729 rc = FALSE; 730 } _SEH2_END; 731 732 if (!rc && ++TriedTimes < 10) { 733 Ext2Sleep(TriedTimes * 100); 734 goto Again; 735 } 736 737 DEBUG(DL_EXT, ("Ext2RemoveVcbExtent: Vbn=%I64xh Length=%I64xh Runs=%u\n", 738 Offset, Length, FsRtlNumberOfRunsInLargeMcb(&Vcb->Extents))); 739 if (rc) { 740 Ext2CheckExtent(&Vcb->Extents, Offset, 0, Length, FALSE); 741 } 742 743 return rc; 744 } 745 746 BOOLEAN 747 Ext2LookupVcbExtent ( 748 IN PEXT2_VCB Vcb, 749 IN LONGLONG Vbn, 750 OUT PLONGLONG Lbn, 751 OUT PLONGLONG Length 752 ) 753 { 754 LONGLONG offset; 755 BOOLEAN rc; 756 757 offset = Vbn & (~(Vcb->IoUnitSize - 1)); 758 ASSERT ((offset & (Vcb->IoUnitSize - 1)) == 0); 759 offset = (offset >> Vcb->IoUnitBits) + 1; 760 761 rc = FsRtlLookupLargeMcbEntry( 762 &(Vcb->Extents), 763 offset, 764 Lbn, 765 Length, 766 NULL, 767 NULL, 768 NULL 769 ); 770 771 if (rc) { 772 773 if (Lbn && ((*Lbn) != -1)) { 774 ASSERT((*Lbn) > 0); 775 (*Lbn) = (((*Lbn) - 1) << Vcb->IoUnitBits); 776 (*Lbn) += ((Vbn) & (Vcb->IoUnitSize - 1)); 777 } 778 779 if (Length && *Length) { 780 (*Length) <<= Vcb->IoUnitBits; 781 (*Length) -= ((Vbn) & (Vcb->IoUnitSize - 1)); 782 } 783 } 784 785 return rc; 786 } 787 788 789 BOOLEAN 790 Ext2AddMcbExtent ( 791 IN PEXT2_VCB Vcb, 792 IN PEXT2_MCB Mcb, 793 IN LONGLONG Vbn, 794 IN LONGLONG Lbn, 795 IN LONGLONG Length 796 ) 797 { 798 ULONG TriedTimes = 0; 799 LONGLONG Base = 0; 800 UCHAR Bits = 0; 801 BOOLEAN rc = FALSE; 802 803 Base = (LONGLONG)BLOCK_SIZE; 804 Bits = (UCHAR)BLOCK_BITS; 805 806 ASSERT ((Vbn & (Base - 1)) == 0); 807 ASSERT ((Lbn & (Base - 1)) == 0); 808 ASSERT ((Length & (Base - 1)) == 0); 809 810 Vbn = (Vbn >> Bits) + 1; 811 Lbn = (Lbn >> Bits) + 1; 812 Length = (Length >> Bits); 813 814 Again: 815 816 _SEH2_TRY { 817 818 rc = FsRtlAddLargeMcbEntry( 819 &Mcb->Extents, 820 Vbn, 821 Lbn, 822 Length 823 ); 824 825 } _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) { 826 827 DbgBreak(); 828 rc = FALSE; 829 } _SEH2_END; 830 831 if (!rc && ++TriedTimes < 10) { 832 Ext2Sleep(TriedTimes * 100); 833 goto Again; 834 } 835 836 DEBUG(DL_EXT, ("Ext2AddMcbExtent: Vbn=%I64xh Lbn=%I64xh Length=%I64xh," 837 " rc=%d Runs=%u\n", Vbn, Lbn, Length, rc, 838 FsRtlNumberOfRunsInLargeMcb(&Mcb->Extents))); 839 840 if (rc) { 841 Ext2CheckExtent(&Mcb->Extents, Vbn, Lbn, Length, TRUE); 842 } 843 844 return rc; 845 } 846 847 BOOLEAN 848 Ext2RemoveMcbExtent ( 849 IN PEXT2_VCB Vcb, 850 IN PEXT2_MCB Mcb, 851 IN LONGLONG Vbn, 852 IN LONGLONG Length 853 ) 854 { 855 ULONG TriedTimes = 0; 856 LONGLONG Base = 0; 857 UCHAR Bits = 0; 858 BOOLEAN rc = TRUE; 859 860 Base = (LONGLONG)BLOCK_SIZE; 861 Bits = (UCHAR)BLOCK_BITS; 862 863 ASSERT ((Vbn & (Base - 1)) == 0); 864 ASSERT ((Length & (Base - 1)) == 0); 865 866 Vbn = (Vbn >> Bits) + 1; 867 Length = (Length >> Bits); 868 869 Again: 870 871 _SEH2_TRY { 872 FsRtlRemoveLargeMcbEntry( 873 &Mcb->Extents, 874 Vbn, 875 Length 876 ); 877 } _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) { 878 DbgBreak(); 879 rc = FALSE; 880 } _SEH2_END; 881 882 if (!rc && ++TriedTimes < 10) { 883 Ext2Sleep(TriedTimes * 100); 884 goto Again; 885 } 886 887 DEBUG(DL_EXT, ("Ext2RemoveMcbExtent: Vbn=%I64xh Length=%I64xh Runs=%u\n", 888 Vbn, Length, FsRtlNumberOfRunsInLargeMcb(&Mcb->Extents))); 889 if (rc) { 890 Ext2CheckExtent(&Mcb->Extents, Vbn, 0, Length, FALSE); 891 } 892 893 return rc; 894 } 895 896 BOOLEAN 897 Ext2LookupMcbExtent ( 898 IN PEXT2_VCB Vcb, 899 IN PEXT2_MCB Mcb, 900 IN LONGLONG Vbn, 901 OUT PLONGLONG Lbn, 902 OUT PLONGLONG Length 903 ) 904 { 905 LONGLONG offset; 906 BOOLEAN rc; 907 908 offset = Vbn & (~((LONGLONG)BLOCK_SIZE - 1)); 909 ASSERT ((offset & (BLOCK_SIZE - 1)) == 0); 910 offset = (offset >> BLOCK_BITS) + 1; 911 912 rc = FsRtlLookupLargeMcbEntry( 913 &(Mcb->Extents), 914 offset, 915 Lbn, 916 Length, 917 NULL, 918 NULL, 919 NULL 920 ); 921 922 if (rc) { 923 924 if (Lbn && ((*Lbn) != -1)) { 925 ASSERT((*Lbn) > 0); 926 (*Lbn) = (((*Lbn) - 1) << BLOCK_BITS); 927 (*Lbn) += ((Vbn) & ((LONGLONG)BLOCK_SIZE - 1)); 928 } 929 930 if (Length && *Length) { 931 (*Length) <<= BLOCK_BITS; 932 (*Length) -= ((Vbn) & ((LONGLONG)BLOCK_SIZE - 1)); 933 } 934 } 935 936 return rc; 937 } 938 939 940 BOOLEAN 941 Ext2AddMcbMetaExts ( 942 IN PEXT2_VCB Vcb, 943 IN PEXT2_MCB Mcb, 944 IN ULONG Block, 945 IN ULONG Length 946 ) 947 { 948 ULONG TriedTimes = 0; 949 LONGLONG Lbn = Block + 1; 950 BOOLEAN rc = TRUE; 951 952 Again: 953 954 _SEH2_TRY { 955 956 rc = FsRtlAddLargeMcbEntry( 957 &Mcb->MetaExts, 958 Lbn, 959 Lbn, 960 Length 961 ); 962 963 } _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) { 964 965 DbgBreak(); 966 rc = FALSE; 967 } _SEH2_END; 968 969 if (!rc && ++TriedTimes < 10) { 970 Ext2Sleep(TriedTimes * 100); 971 goto Again; 972 } 973 974 DEBUG(DL_EXT, ("Ext2AddMcbMetaExts: Block: %xh-%xh rc=%d Runs=%u\n", Block, 975 Length, rc, FsRtlNumberOfRunsInLargeMcb(&Mcb->MetaExts))); 976 977 if (rc) { 978 Ext2CheckExtent(&Mcb->MetaExts, Lbn, Lbn, Length, TRUE); 979 } 980 981 return rc; 982 } 983 984 BOOLEAN 985 Ext2RemoveMcbMetaExts ( 986 IN PEXT2_VCB Vcb, 987 IN PEXT2_MCB Mcb, 988 IN ULONG Block, 989 IN ULONG Length 990 ) 991 { 992 ULONG TriedTimes = 0; 993 LONGLONG Lbn = Block + 1; 994 BOOLEAN rc = TRUE; 995 996 Again: 997 998 _SEH2_TRY { 999 1000 FsRtlRemoveLargeMcbEntry( 1001 &Mcb->MetaExts, 1002 Lbn, 1003 Length 1004 ); 1005 1006 } _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) { 1007 DbgBreak(); 1008 rc = FALSE; 1009 } _SEH2_END; 1010 1011 if (!rc && ++TriedTimes < 10) { 1012 Ext2Sleep(TriedTimes * 100); 1013 goto Again; 1014 } 1015 1016 DEBUG(DL_EXT, ("Ext2RemoveMcbMetaExts: Block: %xh-%xhh Runs=%u\n", Block, 1017 Length, FsRtlNumberOfRunsInLargeMcb(&Mcb->MetaExts))); 1018 if (rc) { 1019 Ext2CheckExtent(&Mcb->MetaExts, Lbn, 0, Length, FALSE); 1020 } 1021 1022 return rc; 1023 } 1024 1025 1026 BOOLEAN 1027 Ext2AddBlockExtent( 1028 IN PEXT2_VCB Vcb, 1029 IN PEXT2_MCB Mcb, 1030 IN ULONG Start, 1031 IN ULONG Block, 1032 IN ULONG Number 1033 ) 1034 { 1035 LONGLONG Vbn = 0; 1036 LONGLONG Lbn = 0; 1037 LONGLONG Length = 0; 1038 1039 Vbn = ((LONGLONG) Start) << BLOCK_BITS; 1040 Lbn = ((LONGLONG) Block) << BLOCK_BITS; 1041 Length = ((LONGLONG)Number << BLOCK_BITS); 1042 1043 if (Mcb) { 1044 #if EXT2_DEBUG 1045 ULONG _block = 0, _mapped = 0; 1046 BOOLEAN _rc = Ext2LookupBlockExtent(Vcb, Mcb, Start, &_block, &_mapped); 1047 if (_rc && _block != 0 && (_block != Block)) { 1048 DbgBreak(); 1049 } 1050 #endif 1051 return Ext2AddMcbExtent(Vcb, Mcb, Vbn, Lbn, Length); 1052 1053 } 1054 1055 ASSERT(Start == Block); 1056 return Ext2AddVcbExtent(Vcb, Vbn, Length); 1057 } 1058 1059 1060 BOOLEAN 1061 Ext2LookupBlockExtent( 1062 IN PEXT2_VCB Vcb, 1063 IN PEXT2_MCB Mcb, 1064 IN ULONG Start, 1065 IN PULONG Block, 1066 IN PULONG Mapped 1067 ) 1068 { 1069 LONGLONG Vbn = 0; 1070 LONGLONG Lbn = 0; 1071 LONGLONG Length = 0; 1072 1073 BOOLEAN rc = FALSE; 1074 1075 Vbn = ((LONGLONG) Start) << BLOCK_BITS; 1076 1077 if (Mcb) { 1078 rc = Ext2LookupMcbExtent(Vcb, Mcb, Vbn, &Lbn, &Length); 1079 } else { 1080 rc = Ext2LookupVcbExtent(Vcb, Vbn, &Lbn, &Length); 1081 } 1082 1083 if (rc) { 1084 *Mapped = (ULONG)(Length >> BLOCK_BITS); 1085 if (Lbn != -1 && Length > 0) { 1086 *Block = (ULONG)(Lbn >> BLOCK_BITS); 1087 } else { 1088 *Block = 0; 1089 } 1090 } 1091 1092 return rc; 1093 } 1094 1095 1096 BOOLEAN 1097 Ext2RemoveBlockExtent( 1098 IN PEXT2_VCB Vcb, 1099 IN PEXT2_MCB Mcb, 1100 IN ULONG Start, 1101 IN ULONG Number 1102 ) 1103 { 1104 LONGLONG Vbn = 0; 1105 LONGLONG Length = 0; 1106 BOOLEAN rc; 1107 1108 Vbn = ((LONGLONG) Start) << BLOCK_BITS; 1109 Length = ((LONGLONG)Number << BLOCK_BITS); 1110 1111 if (Mcb) { 1112 rc = Ext2RemoveMcbExtent(Vcb, Mcb, Vbn, Length); 1113 } else { 1114 rc = Ext2RemoveVcbExtent(Vcb, Vbn, Length); 1115 } 1116 1117 return rc; 1118 } 1119 1120 NTSTATUS 1121 Ext2InitializeZone( 1122 IN PEXT2_IRP_CONTEXT IrpContext, 1123 IN PEXT2_VCB Vcb, 1124 IN PEXT2_MCB Mcb 1125 ) 1126 { 1127 NTSTATUS Status = STATUS_SUCCESS; 1128 1129 ULONG Start = 0; 1130 ULONG End; 1131 ULONG Block; 1132 ULONG Mapped; 1133 1134 Ext2ClearAllExtents(&Mcb->Extents); 1135 Ext2ClearAllExtents(&Mcb->MetaExts); 1136 1137 ASSERT(Mcb != NULL); 1138 End = (ULONG)((Mcb->Inode.i_size + BLOCK_SIZE - 1) >> BLOCK_BITS); 1139 1140 while (Start < End) { 1141 1142 Block = Mapped = 0; 1143 1144 /* mapping file offset to ext2 block */ 1145 if (INODE_HAS_EXTENT(&Mcb->Inode)) { 1146 Status = Ext2MapExtent( 1147 IrpContext, 1148 Vcb, 1149 Mcb, 1150 Start, 1151 FALSE, 1152 &Block, 1153 &Mapped 1154 ); 1155 } else { 1156 Status = Ext2MapIndirect( 1157 IrpContext, 1158 Vcb, 1159 Mcb, 1160 Start, 1161 FALSE, 1162 &Block, 1163 &Mapped 1164 ); 1165 } 1166 1167 if (!NT_SUCCESS(Status)) { 1168 goto errorout; 1169 } 1170 1171 /* skip wrong blocks, in case wrongly treating symlink 1172 target names as blocks, silly */ 1173 if (Block >= TOTAL_BLOCKS) { 1174 Block = 0; 1175 } 1176 1177 if (Block) { 1178 if (!Ext2AddBlockExtent(Vcb, Mcb, Start, Block, Mapped)) { 1179 DbgBreak(); 1180 ClearFlag(Mcb->Flags, MCB_ZONE_INITED); 1181 Ext2ClearAllExtents(&Mcb->Extents); 1182 Status = STATUS_INSUFFICIENT_RESOURCES; 1183 goto errorout; 1184 } 1185 DEBUG(DL_MAP, ("Ext2InitializeZone %wZ: Block = %xh Mapped = %xh\n", 1186 &Mcb->FullName, Block, Mapped)); 1187 } 1188 1189 /* Mapped is total number of continous blocks or NULL blocks */ 1190 Start += Mapped; 1191 } 1192 1193 /* set mcb zone as initialized */ 1194 SetLongFlag(Mcb->Flags, MCB_ZONE_INITED); 1195 1196 errorout: 1197 1198 if (!IsZoneInited(Mcb)) { 1199 Ext2ClearAllExtents(&Mcb->Extents); 1200 Ext2ClearAllExtents(&Mcb->MetaExts); 1201 } 1202 1203 return Status; 1204 } 1205 1206 NTSTATUS 1207 Ext2BuildExtents( 1208 IN PEXT2_IRP_CONTEXT IrpContext, 1209 IN PEXT2_VCB Vcb, 1210 IN PEXT2_MCB Mcb, 1211 IN ULONGLONG Offset, 1212 IN ULONG Size, 1213 IN BOOLEAN bAlloc, 1214 OUT PEXT2_EXTENT * Chain 1215 ) 1216 { 1217 ULONG Start, End; 1218 ULONG Total = 0; 1219 1220 LONGLONG Lba = 0; 1221 NTSTATUS Status = STATUS_SUCCESS; 1222 1223 PEXT2_EXTENT Extent = NULL; 1224 PEXT2_EXTENT List = *Chain = NULL; 1225 1226 if (!IsZoneInited(Mcb)) { 1227 Status = Ext2InitializeZone(IrpContext, Vcb, Mcb); 1228 if (!NT_SUCCESS(Status)) { 1229 DbgBreak(); 1230 } 1231 } 1232 1233 if ((IrpContext && IrpContext->Irp) && 1234 ((IrpContext->Irp->Flags & IRP_NOCACHE) || 1235 (IrpContext->Irp->Flags & IRP_PAGING_IO))) { 1236 Size = (Size + SECTOR_SIZE - 1) & (~(SECTOR_SIZE - 1)); 1237 } 1238 1239 Start = (ULONG)(Offset >> BLOCK_BITS); 1240 End = (ULONG)((Size + Offset + BLOCK_SIZE - 1) >> BLOCK_BITS); 1241 1242 if (End > (ULONG)((Mcb->Inode.i_size + BLOCK_SIZE - 1) >> BLOCK_BITS) ) { 1243 End = (ULONG)((Mcb->Inode.i_size + BLOCK_SIZE - 1) >> BLOCK_BITS); 1244 } 1245 1246 while (Size > 0 && Start < End) { 1247 1248 ULONG Mapped = 0; 1249 ULONG Length = 0; 1250 ULONG Block = 0; 1251 1252 BOOLEAN rc = FALSE; 1253 1254 /* try to map file offset to ext2 block upon Extents cache */ 1255 if (IsZoneInited(Mcb)) { 1256 rc = Ext2LookupBlockExtent( 1257 Vcb, 1258 Mcb, 1259 Start, 1260 &Block, 1261 &Mapped); 1262 1263 if (!rc) { 1264 /* we likely get a sparse file here */ 1265 Mapped = 1; 1266 Block = 0; 1267 } 1268 } 1269 1270 /* try to BlockMap in case failed to access Extents cache */ 1271 if (!IsZoneInited(Mcb) || (bAlloc && Block == 0)) { 1272 1273 Status = Ext2BlockMap( 1274 IrpContext, 1275 Vcb, 1276 Mcb, 1277 Start, 1278 bAlloc, 1279 &Block, 1280 &Mapped 1281 ); 1282 if (!NT_SUCCESS(Status)) { 1283 break; 1284 } 1285 1286 /* skip wrong blocks, in case wrongly treating symlink 1287 target names as blocks, silly */ 1288 if (Block >= TOTAL_BLOCKS) { 1289 Block = 0; 1290 } 1291 1292 /* add new allocated blocks to Mcb zone */ 1293 if (IsZoneInited(Mcb) && Block) { 1294 if (!Ext2AddBlockExtent(Vcb, Mcb, Start, Block, Mapped)) { 1295 DbgBreak(); 1296 ClearFlag(Mcb->Flags, MCB_ZONE_INITED); 1297 Ext2ClearAllExtents(&Mcb->Extents); 1298 } 1299 } 1300 } 1301 1302 /* calculate i/o extent */ 1303 Lba = ((LONGLONG)Block << BLOCK_BITS) + Offset - ((LONGLONG)Start << BLOCK_BITS); 1304 Length = (ULONG)(((LONGLONG)(Start + Mapped) << BLOCK_BITS) - Offset); 1305 if (Length > Size) { 1306 Length = Size; 1307 } 1308 1309 if (0 == Length) { 1310 DbgBreak(); 1311 break; 1312 } 1313 1314 Start += Mapped; 1315 Offset = (ULONGLONG)Start << BLOCK_BITS; 1316 1317 if (Block != 0) { 1318 1319 if (List && List->Lba + List->Length == Lba) { 1320 1321 /* it's continuous upon previous Extent */ 1322 List->Length += Length; 1323 1324 } else { 1325 1326 /* have to allocate a new Extent */ 1327 Extent = Ext2AllocateExtent(); 1328 if (!Extent) { 1329 Status = STATUS_INSUFFICIENT_RESOURCES; 1330 DbgBreak(); 1331 break; 1332 } 1333 1334 Extent->Lba = Lba; 1335 Extent->Length = Length; 1336 Extent->Offset = Total; 1337 1338 /* insert new Extent to chain */ 1339 if (List) { 1340 List->Next = Extent; 1341 List = Extent; 1342 } else { 1343 *Chain = List = Extent; 1344 } 1345 } 1346 } else { 1347 if (bAlloc) { 1348 DbgBreak(); 1349 } 1350 } 1351 1352 Total += Length; 1353 Size -= Length; 1354 } 1355 1356 return Status; 1357 } 1358 1359 1360 BOOLEAN 1361 Ext2BuildName( 1362 IN OUT PUNICODE_STRING Target, 1363 IN PUNICODE_STRING File, 1364 IN PUNICODE_STRING Parent 1365 ) 1366 { 1367 USHORT Length = 0; 1368 USHORT ParentLen = 0; 1369 BOOLEAN bBackslash = TRUE; 1370 1371 /* free the original buffer */ 1372 if (Target->Buffer) { 1373 DEC_MEM_COUNT(PS_MCB_NAME, Target->Buffer, Target->MaximumLength); 1374 Ext2FreePool(Target->Buffer, EXT2_FNAME_MAGIC); 1375 Target->Length = Target->MaximumLength = 0; 1376 } 1377 1378 /* check the parent directory's name and backslash */ 1379 if (Parent && Parent->Buffer && Parent->Length > 0) { 1380 ParentLen = Parent->Length / sizeof(WCHAR); 1381 if (Parent->Buffer[ParentLen - 1] == L'\\') { 1382 bBackslash = FALSE; 1383 } 1384 } 1385 1386 if (Parent == NULL || File->Buffer[0] == L'\\') { 1387 /* must be root inode */ 1388 ASSERT(ParentLen == 0); 1389 bBackslash = FALSE; 1390 } 1391 1392 /* allocate and initialize new name buffer */ 1393 Length = File->Length; 1394 Length += (ParentLen + (bBackslash ? 1 : 0)) * sizeof(WCHAR); 1395 1396 Target->Buffer = Ext2AllocatePool( 1397 PagedPool, 1398 Length + 2, 1399 EXT2_FNAME_MAGIC 1400 ); 1401 1402 if (!Target->Buffer) { 1403 DEBUG(DL_ERR, ( "Ex2BuildName: failed to allocate name bufer.\n")); 1404 return FALSE; 1405 } 1406 RtlZeroMemory(Target->Buffer, Length + 2); 1407 1408 if (ParentLen) { 1409 RtlCopyMemory(&Target->Buffer[0], 1410 Parent->Buffer, 1411 ParentLen * sizeof(WCHAR)); 1412 } 1413 1414 if (bBackslash) { 1415 Target->Buffer[ParentLen++] = L'\\'; 1416 } 1417 1418 RtlCopyMemory( &Target->Buffer[ParentLen], 1419 File->Buffer, 1420 File->Length); 1421 1422 INC_MEM_COUNT(PS_MCB_NAME, Target->Buffer, Length + 2); 1423 Target->Length = Length; 1424 Target->MaximumLength = Length + 2; 1425 1426 return TRUE; 1427 } 1428 1429 PEXT2_MCB 1430 Ext2AllocateMcb ( 1431 IN PEXT2_VCB Vcb, 1432 IN PUNICODE_STRING FileName, 1433 IN PUNICODE_STRING Parent, 1434 IN ULONG FileAttr 1435 ) 1436 { 1437 PEXT2_MCB Mcb = NULL; 1438 NTSTATUS Status = STATUS_SUCCESS; 1439 1440 /* need wake the reaper thread if there are many Mcb allocated */ 1441 if (Ext2Global->PerfStat.Current.Mcb > (((ULONG)Ext2Global->MaxDepth) * 4)) { 1442 KeSetEvent(&Ext2Global->McbReaper.Wait, 0, FALSE); 1443 } 1444 1445 /* allocate Mcb from LookasideList */ 1446 Mcb = (PEXT2_MCB) (ExAllocateFromNPagedLookasideList( 1447 &(Ext2Global->Ext2McbLookasideList))); 1448 1449 if (Mcb == NULL) { 1450 return NULL; 1451 } 1452 1453 /* initialize Mcb header */ 1454 RtlZeroMemory(Mcb, sizeof(EXT2_MCB)); 1455 Mcb->Identifier.Type = EXT2MCB; 1456 Mcb->Identifier.Size = sizeof(EXT2_MCB); 1457 Mcb->FileAttr = FileAttr; 1458 1459 Mcb->Inode.i_priv = (PVOID)Mcb; 1460 Mcb->Inode.i_sb = &Vcb->sb; 1461 1462 /* initialize Mcb names */ 1463 if (FileName) { 1464 1465 #if EXT2_DEBUG 1466 if ( FileName->Length == 2 && 1467 FileName->Buffer[0] == L'\\') { 1468 DEBUG(DL_RES, ( "Ext2AllocateMcb: Root Mcb is to be created !\n")); 1469 } 1470 1471 if ( FileName->Length == 2 && 1472 FileName->Buffer[0] == L'.') { 1473 DbgBreak(); 1474 } 1475 1476 if ( FileName->Length == 4 && 1477 FileName->Buffer[0] == L'.' && 1478 FileName->Buffer[1] == L'.' ) { 1479 DbgBreak(); 1480 } 1481 #endif 1482 1483 if (( FileName->Length >= 4 && FileName->Buffer[0] == L'.') && 1484 ((FileName->Length == 4 && FileName->Buffer[1] != L'.') || 1485 FileName->Length >= 6 )) { 1486 SetFlag(Mcb->FileAttr, FILE_ATTRIBUTE_HIDDEN); 1487 } 1488 1489 if (!Ext2BuildName(&Mcb->ShortName, FileName, NULL)) { 1490 goto errorout; 1491 } 1492 if (!Ext2BuildName(&Mcb->FullName, FileName, Parent)) { 1493 goto errorout; 1494 } 1495 } 1496 1497 /* initialize Mcb Extents, it will raise an expcetion if failed */ 1498 _SEH2_TRY { 1499 FsRtlInitializeLargeMcb(&(Mcb->Extents), NonPagedPool); 1500 FsRtlInitializeLargeMcb(&(Mcb->MetaExts), NonPagedPool); 1501 } _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) { 1502 Status = STATUS_INSUFFICIENT_RESOURCES; 1503 DbgBreak(); 1504 } _SEH2_END; 1505 1506 if (!NT_SUCCESS(Status)) { 1507 goto errorout; 1508 } 1509 1510 INC_MEM_COUNT(PS_MCB, Mcb, sizeof(EXT2_MCB)); 1511 DEBUG(DL_INF, ( "Ext2AllocateMcb: Mcb %wZ created.\n", &Mcb->FullName)); 1512 1513 return Mcb; 1514 1515 errorout: 1516 1517 if (Mcb) { 1518 1519 if (Mcb->ShortName.Buffer) { 1520 DEC_MEM_COUNT(PS_MCB_NAME, Mcb->ShortName.Buffer, 1521 Mcb->ShortName.MaximumLength); 1522 Ext2FreePool(Mcb->ShortName.Buffer, EXT2_FNAME_MAGIC); 1523 } 1524 1525 if (Mcb->FullName.Buffer) { 1526 DEC_MEM_COUNT(PS_MCB_NAME, Mcb->FullName.Buffer, 1527 Mcb->FullName.MaximumLength); 1528 Ext2FreePool(Mcb->FullName.Buffer, EXT2_FNAME_MAGIC); 1529 } 1530 1531 ExFreeToNPagedLookasideList(&(Ext2Global->Ext2McbLookasideList), Mcb); 1532 } 1533 1534 return NULL; 1535 } 1536 1537 VOID 1538 Ext2FreeMcb (IN PEXT2_VCB Vcb, IN PEXT2_MCB Mcb) 1539 { 1540 #ifndef __REACTOS__ 1541 PEXT2_MCB Parent = Mcb->Parent; 1542 #endif 1543 1544 ASSERT(Mcb != NULL); 1545 1546 ASSERT((Mcb->Identifier.Type == EXT2MCB) && 1547 (Mcb->Identifier.Size == sizeof(EXT2_MCB))); 1548 1549 if ((Mcb->Identifier.Type != EXT2MCB) || 1550 (Mcb->Identifier.Size != sizeof(EXT2_MCB))) { 1551 return; 1552 } 1553 1554 DEBUG(DL_INF, ( "Ext2FreeMcb: Mcb %wZ will be freed.\n", &Mcb->FullName)); 1555 1556 if (IsMcbSymLink(Mcb) && Mcb->Target) { 1557 Ext2DerefMcb(Mcb->Target); 1558 } 1559 1560 if (FsRtlNumberOfRunsInLargeMcb(&Mcb->Extents)) { 1561 DEBUG(DL_EXT, ("List data extents for: %wZ\n", &Mcb->FullName)); 1562 Ext2ListExtents(&Mcb->Extents); 1563 } 1564 FsRtlUninitializeLargeMcb(&(Mcb->Extents)); 1565 if (FsRtlNumberOfRunsInLargeMcb(&Mcb->MetaExts)) { 1566 DEBUG(DL_EXT, ("List meta extents for: %wZ\n", &Mcb->FullName)); 1567 Ext2ListExtents(&Mcb->MetaExts); 1568 } 1569 FsRtlUninitializeLargeMcb(&(Mcb->MetaExts)); 1570 ClearLongFlag(Mcb->Flags, MCB_ZONE_INITED); 1571 1572 if (Mcb->ShortName.Buffer) { 1573 DEC_MEM_COUNT(PS_MCB_NAME, Mcb->ShortName.Buffer, 1574 Mcb->ShortName.MaximumLength); 1575 Ext2FreePool(Mcb->ShortName.Buffer, EXT2_FNAME_MAGIC); 1576 } 1577 1578 if (Mcb->FullName.Buffer) { 1579 DEC_MEM_COUNT(PS_MCB_NAME, Mcb->FullName.Buffer, 1580 Mcb->FullName.MaximumLength); 1581 Ext2FreePool(Mcb->FullName.Buffer, EXT2_FNAME_MAGIC); 1582 } 1583 1584 /* free dentry */ 1585 if (Mcb->de) { 1586 Ext2FreeEntry(Mcb->de); 1587 } 1588 1589 Mcb->Identifier.Type = 0; 1590 Mcb->Identifier.Size = 0; 1591 1592 ExFreeToNPagedLookasideList(&(Ext2Global->Ext2McbLookasideList), Mcb); 1593 DEC_MEM_COUNT(PS_MCB, Mcb, sizeof(EXT2_MCB)); 1594 } 1595 1596 1597 PEXT2_MCB 1598 Ext2SearchMcb( 1599 PEXT2_VCB Vcb, 1600 PEXT2_MCB Parent, 1601 PUNICODE_STRING FileName 1602 ) 1603 { 1604 BOOLEAN LockAcquired = FALSE; 1605 PEXT2_MCB Mcb = NULL; 1606 1607 _SEH2_TRY { 1608 ExAcquireResourceSharedLite(&Vcb->McbLock, TRUE); 1609 LockAcquired = TRUE; 1610 Mcb = Ext2SearchMcbWithoutLock(Parent, FileName); 1611 } _SEH2_FINALLY { 1612 if (LockAcquired) { 1613 ExReleaseResourceLite(&Vcb->McbLock); 1614 } 1615 } _SEH2_END; 1616 1617 return Mcb; 1618 } 1619 1620 1621 PEXT2_MCB 1622 Ext2SearchMcbWithoutLock( 1623 PEXT2_MCB Parent, 1624 PUNICODE_STRING FileName 1625 ) 1626 { 1627 PEXT2_MCB TmpMcb = NULL; 1628 1629 DEBUG(DL_RES, ("Ext2SearchMcb: %wZ\n", FileName)); 1630 1631 _SEH2_TRY { 1632 1633 Ext2ReferMcb(Parent); 1634 1635 if (Ext2IsDot(FileName)) { 1636 TmpMcb = Parent; 1637 Ext2ReferMcb(Parent); 1638 _SEH2_LEAVE; 1639 } 1640 1641 if (Ext2IsDotDot(FileName)) { 1642 if (IsMcbRoot(Parent)) { 1643 TmpMcb = Parent; 1644 } else { 1645 TmpMcb = Parent->Parent; 1646 } 1647 if (TmpMcb) { 1648 Ext2ReferMcb(TmpMcb); 1649 } 1650 _SEH2_LEAVE; 1651 } 1652 1653 if (IsMcbSymLink(Parent)) { 1654 if (Parent->Target) { 1655 TmpMcb = Parent->Target->Child; 1656 ASSERT(!IsMcbSymLink(Parent->Target)); 1657 } else { 1658 TmpMcb = NULL; 1659 _SEH2_LEAVE; 1660 } 1661 } else { 1662 TmpMcb = Parent->Child; 1663 } 1664 1665 while (TmpMcb) { 1666 1667 if (!RtlCompareUnicodeString( 1668 &(TmpMcb->ShortName), 1669 FileName, TRUE )) { 1670 Ext2ReferMcb(TmpMcb); 1671 break; 1672 } 1673 1674 TmpMcb = TmpMcb->Next; 1675 } 1676 1677 } _SEH2_FINALLY { 1678 1679 Ext2DerefMcb(Parent); 1680 } _SEH2_END; 1681 1682 return TmpMcb; 1683 } 1684 1685 VOID 1686 Ext2InsertMcb ( 1687 PEXT2_VCB Vcb, 1688 PEXT2_MCB Parent, 1689 PEXT2_MCB Child 1690 ) 1691 { 1692 BOOLEAN LockAcquired = FALSE; 1693 PEXT2_MCB Mcb = NULL; 1694 1695 _SEH2_TRY { 1696 1697 ExAcquireResourceExclusiveLite( 1698 &Vcb->McbLock, 1699 TRUE ); 1700 LockAcquired = TRUE; 1701 1702 /* use it's target if it's a symlink */ 1703 if (IsMcbSymLink(Parent)) { 1704 Parent = Parent->Target; 1705 ASSERT(!IsMcbSymLink(Parent)); 1706 } 1707 1708 Mcb = Parent->Child; 1709 while (Mcb) { 1710 if (Mcb == Child) { 1711 break; 1712 } 1713 Mcb = Mcb->Next; 1714 } 1715 1716 if (Mcb) { 1717 /* already attached in the list */ 1718 DEBUG(DL_ERR, ( "Ext2InsertMcb: Child Mcb is alreay attached.\n")); 1719 if (!IsFlagOn(Mcb->Flags, MCB_ENTRY_TREE)) { 1720 SetLongFlag(Child->Flags, MCB_ENTRY_TREE); 1721 DEBUG(DL_ERR, ( "Ext2InsertMcb: Child Mcb's flag isn't set.\n")); 1722 } 1723 1724 DbgBreak(); 1725 1726 } else { 1727 1728 /* insert this Mcb into the head */ 1729 Child->Next = Parent->Child; 1730 Parent->Child = Child; 1731 Child->Parent = Parent; 1732 Child->de->d_parent = Parent->de; 1733 Ext2ReferMcb(Parent); 1734 SetLongFlag(Child->Flags, MCB_ENTRY_TREE); 1735 } 1736 1737 } _SEH2_FINALLY { 1738 1739 if (LockAcquired) { 1740 ExReleaseResourceLite(&Vcb->McbLock); 1741 } 1742 } _SEH2_END; 1743 } 1744 1745 BOOLEAN 1746 Ext2RemoveMcb ( 1747 PEXT2_VCB Vcb, 1748 PEXT2_MCB Mcb 1749 ) 1750 { 1751 PEXT2_MCB TmpMcb = NULL; 1752 BOOLEAN LockAcquired = FALSE; 1753 BOOLEAN bLinked = FALSE; 1754 1755 _SEH2_TRY { 1756 1757 ExAcquireResourceExclusiveLite(&Vcb->McbLock, TRUE); 1758 LockAcquired = TRUE; 1759 1760 if (Mcb->Parent) { 1761 1762 if (Mcb->Parent->Child == Mcb) { 1763 Mcb->Parent->Child = Mcb->Next; 1764 bLinked = TRUE; 1765 } else { 1766 TmpMcb = Mcb->Parent->Child; 1767 1768 while (TmpMcb && TmpMcb->Next != Mcb) { 1769 TmpMcb = TmpMcb->Next; 1770 } 1771 1772 if (TmpMcb) { 1773 TmpMcb->Next = Mcb->Next; 1774 bLinked = TRUE; 1775 } else { 1776 /* we got errors: link broken */ 1777 } 1778 } 1779 1780 if (bLinked) { 1781 if (IsFlagOn(Mcb->Flags, MCB_ENTRY_TREE)) { 1782 DEBUG(DL_RES, ("Mcb %p %wZ removed from Mcb %p %wZ\n", Mcb, 1783 &Mcb->FullName, Mcb->Parent, &Mcb->Parent->FullName)); 1784 Ext2DerefMcb(Mcb->Parent); 1785 ClearLongFlag(Mcb->Flags, MCB_ENTRY_TREE); 1786 } else { 1787 DbgBreak(); 1788 } 1789 } else { 1790 if (IsFlagOn(Mcb->Flags, MCB_ENTRY_TREE)) { 1791 ClearLongFlag(Mcb->Flags, MCB_ENTRY_TREE); 1792 } 1793 DbgBreak(); 1794 } 1795 Mcb->Parent = NULL; 1796 Mcb->de->d_parent = NULL; 1797 } 1798 1799 } _SEH2_FINALLY { 1800 1801 if (LockAcquired) { 1802 ExReleaseResourceLite(&Vcb->McbLock); 1803 } 1804 } _SEH2_END; 1805 1806 return TRUE; 1807 } 1808 1809 VOID 1810 Ext2CleanupAllMcbs(PEXT2_VCB Vcb) 1811 { 1812 BOOLEAN LockAcquired = FALSE; 1813 PEXT2_MCB Mcb = NULL; 1814 1815 _SEH2_TRY { 1816 1817 ExAcquireResourceExclusiveLite( 1818 &Vcb->McbLock, 1819 TRUE ); 1820 LockAcquired = TRUE; 1821 1822 while ((Mcb = Ext2FirstUnusedMcb(Vcb, TRUE, Vcb->NumOfMcb)) != 0) { 1823 while (Mcb) { 1824 PEXT2_MCB Next = Mcb->Next; 1825 if (IsMcbSymLink(Mcb)) { 1826 Mcb->Target = NULL; 1827 } 1828 Ext2FreeMcb(Vcb, Mcb); 1829 Mcb = Next; 1830 } 1831 } 1832 Ext2FreeMcb(Vcb, Vcb->McbTree); 1833 Vcb->McbTree = NULL; 1834 1835 } _SEH2_FINALLY { 1836 1837 if (LockAcquired) { 1838 ExReleaseResourceLite(&Vcb->McbLock); 1839 } 1840 } _SEH2_END; 1841 } 1842 1843 BOOLEAN 1844 Ext2CheckSetBlock(PEXT2_IRP_CONTEXT IrpContext, PEXT2_VCB Vcb, LONGLONG Block) 1845 { 1846 PEXT2_GROUP_DESC gd; 1847 struct buffer_head *gb = NULL; 1848 struct buffer_head *bh = NULL; 1849 ULONG group, dwBlk, Length; 1850 RTL_BITMAP bitmap; 1851 BOOLEAN bModified = FALSE; 1852 1853 group = (ULONG)(Block - EXT2_FIRST_DATA_BLOCK) / BLOCKS_PER_GROUP; 1854 dwBlk = (ULONG)(Block - EXT2_FIRST_DATA_BLOCK) % BLOCKS_PER_GROUP; 1855 1856 gd = ext4_get_group_desc(&Vcb->sb, group, &gb); 1857 if (!gd) { 1858 return FALSE; 1859 } 1860 bh = sb_getblk(&Vcb->sb, ext4_block_bitmap(&Vcb->sb, gd)); 1861 1862 if (group == Vcb->sbi.s_groups_count - 1) { 1863 Length = (ULONG)(TOTAL_BLOCKS % BLOCKS_PER_GROUP); 1864 1865 /* s_blocks_count is integer multiple of s_blocks_per_group */ 1866 if (Length == 0) 1867 Length = BLOCKS_PER_GROUP; 1868 } else { 1869 Length = BLOCKS_PER_GROUP; 1870 } 1871 1872 if (dwBlk >= Length) { 1873 fini_bh(&gb); 1874 fini_bh(&bh); 1875 return FALSE; 1876 } 1877 1878 1879 RtlInitializeBitMap(&bitmap, (PULONG)bh->b_data, Length); 1880 1881 if (RtlCheckBit(&bitmap, dwBlk) == 0) { 1882 DbgBreak(); 1883 RtlSetBits(&bitmap, dwBlk, 1); 1884 bModified = TRUE; 1885 mark_buffer_dirty(bh); 1886 } 1887 1888 fini_bh(&gb); 1889 fini_bh(&bh); 1890 1891 return (!bModified); 1892 } 1893 1894 BOOLEAN 1895 Ext2CheckBitmapConsistency(PEXT2_IRP_CONTEXT IrpContext, PEXT2_VCB Vcb) 1896 { 1897 ULONG i, j, InodeBlocks; 1898 1899 for (i = 0; i < Vcb->sbi.s_groups_count; i++) { 1900 1901 PEXT2_GROUP_DESC gd; 1902 struct buffer_head *bh = NULL; 1903 1904 gd = ext4_get_group_desc(&Vcb->sb, i, &bh); 1905 if (!gd) 1906 continue; 1907 Ext2CheckSetBlock(IrpContext, Vcb, ext4_block_bitmap(&Vcb->sb, gd)); 1908 Ext2CheckSetBlock(IrpContext, Vcb, ext4_inode_bitmap(&Vcb->sb, gd)); 1909 1910 1911 if (i == Vcb->sbi.s_groups_count - 1) { 1912 InodeBlocks = ((INODES_COUNT % INODES_PER_GROUP) * 1913 Vcb->InodeSize + Vcb->BlockSize - 1) / 1914 (Vcb->BlockSize); 1915 } else { 1916 InodeBlocks = (INODES_PER_GROUP * Vcb->InodeSize + 1917 Vcb->BlockSize - 1) / (Vcb->BlockSize); 1918 } 1919 1920 for (j = 0; j < InodeBlocks; j++ ) 1921 Ext2CheckSetBlock(IrpContext, Vcb, ext4_inode_table(&Vcb->sb, gd) + j); 1922 1923 fini_bh(&bh); 1924 } 1925 1926 return TRUE; 1927 } 1928 1929 /* Ext2Global->Resource should be already acquired */ 1930 VOID 1931 Ext2InsertVcb(PEXT2_VCB Vcb) 1932 { 1933 InsertTailList(&(Ext2Global->VcbList), &Vcb->Next); 1934 } 1935 1936 1937 /* Ext2Global->Resource should be already acquired */ 1938 VOID 1939 Ext2RemoveVcb(PEXT2_VCB Vcb) 1940 { 1941 RemoveEntryList(&Vcb->Next); 1942 InitializeListHead(&Vcb->Next); 1943 } 1944 1945 NTSTATUS 1946 Ext2QueryVolumeParams(IN PEXT2_VCB Vcb, IN PUNICODE_STRING Params) 1947 { 1948 NTSTATUS Status; 1949 RTL_QUERY_REGISTRY_TABLE QueryTable[2]; 1950 1951 UNICODE_STRING UniName; 1952 PUSHORT UniBuffer = NULL; 1953 1954 USHORT UUID[50]; 1955 1956 int i; 1957 int len = 0; 1958 1959 /* zero params */ 1960 RtlZeroMemory(Params, sizeof(UNICODE_STRING)); 1961 1962 /* constructing volume UUID name */ 1963 memset(UUID, 0, sizeof(USHORT) * 50); 1964 for (i=0; i < 16; i++) { 1965 if (i == 0) { 1966 swprintf((wchar_t *)&UUID[len], L"{%2.2X",Vcb->SuperBlock->s_uuid[i]); 1967 len += 3; 1968 } else if (i == 15) { 1969 swprintf((wchar_t *)&UUID[len], L"-%2.2X}", Vcb->SuperBlock->s_uuid[i]); 1970 len +=4; 1971 } else { 1972 swprintf((wchar_t *)&UUID[len], L"-%2.2X", Vcb->SuperBlock->s_uuid[i]); 1973 len += 3; 1974 } 1975 } 1976 1977 /* allocating memory for UniBuffer */ 1978 UniBuffer = Ext2AllocatePool(PagedPool, 1024, EXT2_PARAM_MAGIC); 1979 if (NULL == UniBuffer) { 1980 Status = STATUS_INSUFFICIENT_RESOURCES; 1981 goto errorout; 1982 } 1983 RtlZeroMemory(UniBuffer, 1024); 1984 1985 /* querying volume parameter string */ 1986 RtlZeroMemory(&QueryTable[0], sizeof(RTL_QUERY_REGISTRY_TABLE) * 2); 1987 QueryTable[0].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_QUERY_REGISTRY_REQUIRED; 1988 QueryTable[0].Name = UUID; 1989 QueryTable[0].EntryContext = &(UniName); 1990 UniName.MaximumLength = 1024; 1991 UniName.Length = 0; 1992 UniName.Buffer = UniBuffer; 1993 1994 Status = RtlQueryRegistryValues( 1995 RTL_REGISTRY_ABSOLUTE, 1996 Ext2Global->RegistryPath.Buffer, 1997 &QueryTable[0], 1998 NULL, 1999 NULL 2000 ); 2001 2002 if (!NT_SUCCESS(Status)) { 2003 goto errorout; 2004 } 2005 2006 errorout: 2007 2008 if (NT_SUCCESS(Status)) { 2009 *Params = UniName; 2010 } else { 2011 if (UniBuffer) { 2012 Ext2FreePool(UniBuffer, EXT2_PARAM_MAGIC); 2013 } 2014 } 2015 2016 return Status; 2017 } 2018 2019 VOID 2020 Ext2ParseRegistryVolumeParams( 2021 IN PUNICODE_STRING Params, 2022 OUT PEXT2_VOLUME_PROPERTY3 Property 2023 ) 2024 { 2025 WCHAR Codepage[CODEPAGE_MAXLEN]; 2026 WCHAR Prefix[HIDINGPAT_LEN]; 2027 WCHAR Suffix[HIDINGPAT_LEN]; 2028 USHORT MountPoint[4]; 2029 UCHAR DrvLetter[4]; 2030 WCHAR wUID[8], wGID[8], wEUID[8], wEGID[8]; 2031 CHAR sUID[8], sGID[8], sEUID[8], sEGID[8]; 2032 2033 BOOLEAN bWriteSupport = FALSE, 2034 bCheckBitmap = FALSE, 2035 bCodeName = FALSE, 2036 bMountPoint = FALSE; 2037 BOOLEAN bUID = 0, bGID = 0, bEUID = 0, bEGID = 0; 2038 2039 struct { 2040 PWCHAR Name; /* parameters name */ 2041 PBOOLEAN bExist; /* is it contained in params */ 2042 USHORT Length; /* parameter value length */ 2043 PWCHAR uValue; /* value buffer in unicode */ 2044 PCHAR aValue; /* value buffer in ansi */ 2045 } ParamPattern[] = { 2046 /* writing support */ 2047 {READING_ONLY, &Property->bReadonly, 0, NULL, NULL}, 2048 {WRITING_SUPPORT, &bWriteSupport, 0, NULL, NULL}, 2049 {EXT3_FORCEWRITING, &Property->bExt3Writable, 0, NULL, NULL}, 2050 2051 /* need check bitmap */ 2052 {CHECKING_BITMAP, &bCheckBitmap, 0, NULL, NULL}, 2053 /* codepage */ 2054 {CODEPAGE_NAME, &bCodeName, CODEPAGE_MAXLEN, 2055 &Codepage[0], Property->Codepage}, 2056 /* filter prefix and suffix */ 2057 {HIDING_PREFIX, &Property->bHidingPrefix, HIDINGPAT_LEN, 2058 &Prefix[0], Property->sHidingPrefix}, 2059 {HIDING_SUFFIX, &Property->bHidingSuffix, HIDINGPAT_LEN, 2060 &Suffix[0], Property->sHidingSuffix}, 2061 {MOUNT_POINT, &bMountPoint, 4, 2062 &MountPoint[0], &DrvLetter[0]}, 2063 2064 {UID, &bUID, 8, &wUID[0], &sUID[0],}, 2065 {GID, &bGID, 8, &wGID[0], &sGID[0]}, 2066 {EUID, &bEUID, 8, &wEUID[0], &sEUID[0]}, 2067 {EGID, &bEGID, 8, &wEGID[0], &sEGID[0]}, 2068 2069 /* end */ 2070 {NULL, NULL, 0, NULL} 2071 }; 2072 2073 USHORT i, j, k; 2074 2075 #ifdef __REACTOS__ 2076 RtlZeroMemory(Codepage, sizeof(WCHAR) * CODEPAGE_MAXLEN); 2077 RtlZeroMemory(Prefix, sizeof(WCHAR) * HIDINGPAT_LEN); 2078 RtlZeroMemory(Suffix, sizeof(WCHAR) * HIDINGPAT_LEN); 2079 #else 2080 RtlZeroMemory(Codepage, CODEPAGE_MAXLEN); 2081 RtlZeroMemory(Prefix, HIDINGPAT_LEN); 2082 RtlZeroMemory(Suffix, HIDINGPAT_LEN); 2083 #endif 2084 RtlZeroMemory(MountPoint, sizeof(USHORT) * 4); 2085 RtlZeroMemory(DrvLetter, sizeof(CHAR) * 4); 2086 2087 RtlZeroMemory(Property, sizeof(EXT2_VOLUME_PROPERTY3)); 2088 Property->Magic = EXT2_VOLUME_PROPERTY_MAGIC; 2089 Property->Command = APP_CMD_SET_PROPERTY3; 2090 2091 for (i=0; ParamPattern[i].Name != NULL; i++) { 2092 2093 UNICODE_STRING Name1=*Params, Name2; 2094 RtlInitUnicodeString(&Name2, ParamPattern[i].Name); 2095 *ParamPattern[i].bExist = FALSE; 2096 2097 for (j=0; j * sizeof(WCHAR) + Name2.Length <= Params->Length ; j++) { 2098 2099 Name1.MaximumLength = Params->Length - j * sizeof(WCHAR); 2100 Name1.Length = Name2.Length; 2101 Name1.Buffer = &Params->Buffer[j]; 2102 2103 if (!RtlCompareUnicodeString(&Name1, &Name2, TRUE)) { 2104 if (j * sizeof(WCHAR) + Name2.Length == Params->Length || 2105 Name1.Buffer[Name2.Length/sizeof(WCHAR)] == L';' || 2106 Name1.Buffer[Name2.Length/sizeof(WCHAR)] == L',' ) { 2107 *(ParamPattern[i].bExist) = TRUE; 2108 } else if ((j * 2 + Name2.Length < Params->Length + 2) || 2109 (Name1.Buffer[Name2.Length/sizeof(WCHAR)] == L'=' )) { 2110 j += Name2.Length/sizeof(WCHAR) + 1; 2111 k = 0; 2112 while ( j + k < Params->Length/2 && 2113 k < ParamPattern[i].Length && 2114 Params->Buffer[j+k] != L';' && 2115 Params->Buffer[j+k] != L',' ) { 2116 #ifdef __REACTOS__ 2117 ParamPattern[i].uValue[k] = Params->Buffer[j + k]; 2118 k++; 2119 #else 2120 ParamPattern[i].uValue[k] = Params->Buffer[j + k++]; 2121 #endif 2122 } 2123 if (k) { 2124 NTSTATUS status; 2125 ANSI_STRING AnsiName; 2126 AnsiName.Length = 0; 2127 AnsiName.MaximumLength =ParamPattern[i].Length; 2128 AnsiName.Buffer = ParamPattern[i].aValue; 2129 2130 Name2.Buffer = ParamPattern[i].uValue; 2131 Name2.MaximumLength = Name2.Length = k * sizeof(WCHAR); 2132 status = RtlUnicodeStringToAnsiString( 2133 &AnsiName, &Name2, FALSE); 2134 if (NT_SUCCESS(status)) { 2135 *(ParamPattern[i].bExist) = TRUE; 2136 } else { 2137 *ParamPattern[i].bExist = FALSE; 2138 } 2139 } 2140 } 2141 break; 2142 } 2143 } 2144 } 2145 2146 if (bMountPoint) { 2147 Property->DrvLetter = DrvLetter[0]; 2148 Property->DrvLetter |= 0x80; 2149 } 2150 2151 if (bUID && bGID) { 2152 SetFlag(Property->Flags2, EXT2_VPROP3_USERIDS); 2153 sUID[7] = sGID[7] = sEUID[7] = sEGID[7] = 0; 2154 Property->uid = (USHORT)atoi(sUID); 2155 Property->gid = (USHORT)atoi(sGID); 2156 if (bEUID) { 2157 Property->euid = (USHORT)atoi(sEUID); 2158 Property->egid = (USHORT)atoi(sEGID); 2159 Property->EIDS = TRUE; 2160 } else { 2161 Property->EIDS = FALSE; 2162 } 2163 } else { 2164 ClearFlag(Property->Flags2, EXT2_VPROP3_USERIDS); 2165 } 2166 } 2167 2168 NTSTATUS 2169 Ext2PerformRegistryVolumeParams(IN PEXT2_VCB Vcb) 2170 { 2171 NTSTATUS Status; 2172 UNICODE_STRING VolumeParams; 2173 2174 Status = Ext2QueryVolumeParams(Vcb, &VolumeParams); 2175 if (NT_SUCCESS(Status)) { 2176 2177 /* set Vcb settings from registery */ 2178 EXT2_VOLUME_PROPERTY3 Property; 2179 Ext2ParseRegistryVolumeParams(&VolumeParams, &Property); 2180 Ext2ProcessVolumeProperty(Vcb, &Property, sizeof(Property)); 2181 2182 } else { 2183 2184 /* don't support auto mount */ 2185 if (IsFlagOn(Ext2Global->Flags, EXT2_AUTO_MOUNT)) { 2186 Status = STATUS_SUCCESS; 2187 } else { 2188 Status = STATUS_UNSUCCESSFUL; 2189 goto errorout; 2190 } 2191 2192 /* set Vcb settings from Ext2Global */ 2193 if (IsFlagOn(Ext2Global->Flags, EXT2_SUPPORT_WRITING)) { 2194 if (Vcb->IsExt3fs) { 2195 if (IsFlagOn(Ext2Global->Flags, EXT3_FORCE_WRITING)) { 2196 ClearLongFlag(Vcb->Flags, VCB_READ_ONLY); 2197 } else { 2198 SetLongFlag(Vcb->Flags, VCB_READ_ONLY); 2199 } 2200 } else { 2201 ClearLongFlag(Vcb->Flags, VCB_READ_ONLY); 2202 } 2203 } else { 2204 SetLongFlag(Vcb->Flags, VCB_READ_ONLY); 2205 } 2206 2207 /* set the default codepage */ 2208 Vcb->Codepage.PageTable = Ext2Global->Codepage.PageTable; 2209 memcpy(Vcb->Codepage.AnsiName, Ext2Global->Codepage.AnsiName, CODEPAGE_MAXLEN); 2210 Vcb->Codepage.PageTable = Ext2Global->Codepage.PageTable; 2211 2212 if (Vcb->bHidingPrefix == Ext2Global->bHidingPrefix) { 2213 RtlCopyMemory( Vcb->sHidingPrefix, 2214 Ext2Global->sHidingPrefix, 2215 HIDINGPAT_LEN); 2216 } else { 2217 RtlZeroMemory( Vcb->sHidingPrefix, 2218 HIDINGPAT_LEN); 2219 } 2220 2221 if (Vcb->bHidingSuffix == Ext2Global->bHidingSuffix) { 2222 RtlCopyMemory( Vcb->sHidingSuffix, 2223 Ext2Global->sHidingSuffix, 2224 HIDINGPAT_LEN); 2225 } else { 2226 RtlZeroMemory( Vcb->sHidingSuffix, 2227 HIDINGPAT_LEN); 2228 } 2229 } 2230 2231 errorout: 2232 2233 if (VolumeParams.Buffer) { 2234 Ext2FreePool(VolumeParams.Buffer, EXT2_PARAM_MAGIC); 2235 } 2236 2237 return Status; 2238 } 2239 2240 NTSTATUS 2241 Ext2InitializeLabel( 2242 IN PEXT2_VCB Vcb, 2243 IN PEXT2_SUPER_BLOCK Sb 2244 ) 2245 { 2246 NTSTATUS status; 2247 2248 USHORT Length; 2249 UNICODE_STRING Label; 2250 OEM_STRING OemName; 2251 2252 Label.MaximumLength = 16 * sizeof(WCHAR); 2253 Label.Length = 0; 2254 Label.Buffer = Vcb->Vpb->VolumeLabel; 2255 Vcb->Vpb->VolumeLabelLength = 0; 2256 RtlZeroMemory(Label.Buffer, Label.MaximumLength); 2257 2258 Length = 16; 2259 while ( (Length > 0) && 2260 ((Sb->s_volume_name[Length -1] == 0x00) || 2261 (Sb->s_volume_name[Length - 1] == 0x20) ) 2262 ) { 2263 Length--; 2264 } 2265 2266 if (Length == 0) { 2267 return STATUS_SUCCESS; 2268 } 2269 2270 OemName.Buffer = Sb->s_volume_name; 2271 OemName.MaximumLength = 16; 2272 OemName.Length = Length; 2273 2274 status = Ext2OEMToUnicode(Vcb, &Label, &OemName); 2275 if (NT_SUCCESS(status)) { 2276 Vcb->Vpb->VolumeLabelLength = Label.Length; 2277 } 2278 2279 return status; 2280 } 2281 2282 static __inline BOOLEAN Ext2IsNullUuid (__u8 * uuid) 2283 { 2284 int i; 2285 for (i = 0; i < 16; i++) { 2286 if (uuid[i]) { 2287 break; 2288 } 2289 } 2290 2291 return (i >= 16); 2292 } 2293 2294 #define is_power_of_2(x) ((x) != 0 && (((x) & ((x) - 1)) == 0)) 2295 2296 NTSTATUS 2297 Ext2InitializeVcb( IN PEXT2_IRP_CONTEXT IrpContext, 2298 IN PEXT2_VCB Vcb, 2299 IN PEXT2_SUPER_BLOCK sb, 2300 IN PDEVICE_OBJECT TargetDevice, 2301 IN PDEVICE_OBJECT VolumeDevice, 2302 IN PVPB Vpb ) 2303 { 2304 NTSTATUS Status = STATUS_UNRECOGNIZED_VOLUME; 2305 ULONG IoctlSize; 2306 LONGLONG DiskSize; 2307 LONGLONG PartSize; 2308 UNICODE_STRING RootNode; 2309 USHORT Buffer[2]; 2310 ULONG ChangeCount = 0, features; 2311 CC_FILE_SIZES FileSizes; 2312 int i, has_huge_files; 2313 2314 BOOLEAN VcbResourceInitialized = FALSE; 2315 BOOLEAN NotifySyncInitialized = FALSE; 2316 BOOLEAN ExtentsInitialized = FALSE; 2317 BOOLEAN InodeLookasideInitialized = FALSE; 2318 BOOLEAN GroupLoaded = FALSE; 2319 2320 _SEH2_TRY { 2321 2322 if (Vpb == NULL) { 2323 Status = STATUS_DEVICE_NOT_READY; 2324 _SEH2_LEAVE; 2325 } 2326 2327 /* Reject mounting volume if we encounter unsupported incompat features */ 2328 if (FlagOn(sb->s_feature_incompat, ~EXT4_FEATURE_INCOMPAT_SUPP)) { 2329 Status = STATUS_UNRECOGNIZED_VOLUME; 2330 _SEH2_LEAVE; 2331 } 2332 2333 /* Mount the volume RO if we encounter unsupported ro_compat features */ 2334 if (FlagOn(sb->s_feature_ro_compat, ~EXT4_FEATURE_RO_COMPAT_SUPP)) { 2335 SetLongFlag(Vcb->Flags, VCB_RO_COMPAT_READ_ONLY); 2336 } 2337 2338 /* Recognize the filesystem as Ext3fs if it supports journalling */ 2339 if (IsFlagOn(sb->s_feature_compat, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 2340 Vcb->IsExt3fs = TRUE; 2341 } 2342 2343 /* check block size */ 2344 Vcb->BlockSize = (EXT2_MIN_BLOCK_SIZE << sb->s_log_block_size); 2345 /* we cannot handle volume with block size bigger than 64k */ 2346 if (Vcb->BlockSize > EXT2_MAX_USER_BLKSIZE) { 2347 Status = STATUS_UNRECOGNIZED_VOLUME; 2348 _SEH2_LEAVE; 2349 } 2350 2351 if (Vcb->BlockSize >= PAGE_SIZE) { 2352 Vcb->IoUnitBits = PAGE_SHIFT; 2353 Vcb->IoUnitSize = PAGE_SIZE; 2354 } else { 2355 Vcb->IoUnitSize = Vcb->BlockSize; 2356 Vcb->IoUnitBits = Ext2Log2(Vcb->BlockSize); 2357 } 2358 2359 /* initialize vcb header members ... */ 2360 Vcb->Header.IsFastIoPossible = FastIoIsNotPossible; 2361 Vcb->Header.Resource = &(Vcb->MainResource); 2362 Vcb->Header.PagingIoResource = &(Vcb->PagingIoResource); 2363 Vcb->OpenVolumeCount = 0; 2364 Vcb->OpenHandleCount = 0; 2365 Vcb->ReferenceCount = 0; 2366 2367 /* initialize eresources */ 2368 ExInitializeResourceLite(&Vcb->MainResource); 2369 ExInitializeResourceLite(&Vcb->PagingIoResource); 2370 ExInitializeResourceLite(&Vcb->MetaInode); 2371 ExInitializeResourceLite(&Vcb->MetaBlock); 2372 ExInitializeResourceLite(&Vcb->McbLock); 2373 ExInitializeResourceLite(&Vcb->FcbLock); 2374 ExInitializeResourceLite(&Vcb->sbi.s_gd_lock); 2375 #ifndef _WIN2K_TARGET_ 2376 ExInitializeFastMutex(&Vcb->Mutex); 2377 FsRtlSetupAdvancedHeader(&Vcb->Header, &Vcb->Mutex); 2378 #endif 2379 VcbResourceInitialized = TRUE; 2380 2381 /* initialize Fcb list head */ 2382 InitializeListHead(&Vcb->FcbList); 2383 2384 /* initialize Mcb list head */ 2385 InitializeListHead(&(Vcb->McbList)); 2386 2387 /* initialize directory notify list */ 2388 InitializeListHead(&Vcb->NotifyList); 2389 FsRtlNotifyInitializeSync(&Vcb->NotifySync); 2390 NotifySyncInitialized = TRUE; 2391 2392 /* superblock checking */ 2393 Vcb->SuperBlock = sb; 2394 2395 /* initialize Vpb and Label */ 2396 Vcb->DeviceObject = VolumeDevice; 2397 Vcb->TargetDeviceObject = TargetDevice; 2398 Vcb->Vpb = Vpb; 2399 Vcb->RealDevice = Vpb->RealDevice; 2400 Vpb->DeviceObject = VolumeDevice; 2401 2402 /* set inode size */ 2403 Vcb->InodeSize = (ULONG)sb->s_inode_size; 2404 if (Vcb->InodeSize == 0) { 2405 Vcb->InodeSize = EXT2_GOOD_OLD_INODE_SIZE; 2406 } 2407 2408 /* initialize inode lookaside list */ 2409 ExInitializeNPagedLookasideList(&(Vcb->InodeLookasideList), 2410 NULL, NULL, 0, Vcb->InodeSize, 2411 'SNIE', 0); 2412 2413 InodeLookasideInitialized = TRUE; 2414 2415 /* initialize label in Vpb */ 2416 Status = Ext2InitializeLabel(Vcb, sb); 2417 if (!NT_SUCCESS(Status)) { 2418 DbgBreak(); 2419 } 2420 2421 /* check device characteristics flags */ 2422 if (IsFlagOn(Vpb->RealDevice->Characteristics, FILE_REMOVABLE_MEDIA)) { 2423 SetLongFlag(Vcb->Flags, VCB_REMOVABLE_MEDIA); 2424 } 2425 2426 if (IsFlagOn(Vpb->RealDevice->Characteristics, FILE_FLOPPY_DISKETTE)) { 2427 SetLongFlag(Vcb->Flags, VCB_FLOPPY_DISK); 2428 } 2429 2430 if (IsFlagOn(Vpb->RealDevice->Characteristics, FILE_READ_ONLY_DEVICE)) { 2431 SetLongFlag(Vcb->Flags, VCB_WRITE_PROTECTED); 2432 } 2433 2434 if (IsFlagOn(TargetDevice->Characteristics, FILE_READ_ONLY_DEVICE)) { 2435 SetLongFlag(Vcb->Flags, VCB_WRITE_PROTECTED); 2436 } 2437 2438 /* verify device is writable ? */ 2439 if (Ext2IsMediaWriteProtected(IrpContext, TargetDevice)) { 2440 SetFlag(Vcb->Flags, VCB_WRITE_PROTECTED); 2441 } 2442 2443 /* initialize UUID and serial number */ 2444 if (Ext2IsNullUuid(sb->s_uuid)) { 2445 ExUuidCreate((UUID *)sb->s_uuid); 2446 } 2447 Vpb->SerialNumber = ((ULONG*)sb->s_uuid)[0] + 2448 ((ULONG*)sb->s_uuid)[1] + 2449 ((ULONG*)sb->s_uuid)[2] + 2450 ((ULONG*)sb->s_uuid)[3]; 2451 2452 /* query partition size and disk geometry parameters */ 2453 DiskSize = Vcb->DiskGeometry.Cylinders.QuadPart * 2454 Vcb->DiskGeometry.TracksPerCylinder * 2455 Vcb->DiskGeometry.SectorsPerTrack * 2456 Vcb->DiskGeometry.BytesPerSector; 2457 2458 IoctlSize = sizeof(PARTITION_INFORMATION); 2459 Status = Ext2DiskIoControl( 2460 TargetDevice, 2461 IOCTL_DISK_GET_PARTITION_INFO, 2462 NULL, 2463 0, 2464 &Vcb->PartitionInformation, 2465 &IoctlSize ); 2466 if (NT_SUCCESS(Status)) { 2467 PartSize = Vcb->PartitionInformation.PartitionLength.QuadPart; 2468 } else { 2469 Vcb->PartitionInformation.StartingOffset.QuadPart = 0; 2470 Vcb->PartitionInformation.PartitionLength.QuadPart = DiskSize; 2471 PartSize = DiskSize; 2472 Status = STATUS_SUCCESS; 2473 } 2474 Vcb->Header.AllocationSize.QuadPart = 2475 Vcb->Header.FileSize.QuadPart = PartSize; 2476 2477 Vcb->Header.ValidDataLength.QuadPart = 2478 Vcb->Header.FileSize.QuadPart; 2479 2480 /* verify count */ 2481 IoctlSize = sizeof(ULONG); 2482 Status = Ext2DiskIoControl( 2483 TargetDevice, 2484 IOCTL_DISK_CHECK_VERIFY, 2485 NULL, 2486 0, 2487 &ChangeCount, 2488 &IoctlSize ); 2489 2490 if (!NT_SUCCESS(Status)) { 2491 _SEH2_LEAVE; 2492 } 2493 Vcb->ChangeCount = ChangeCount; 2494 2495 /* create the stream object for ext2 volume */ 2496 Vcb->Volume = IoCreateStreamFileObject(NULL, Vcb->Vpb->RealDevice); 2497 if (!Vcb->Volume) { 2498 Status = STATUS_UNRECOGNIZED_VOLUME; 2499 _SEH2_LEAVE; 2500 } 2501 2502 /* initialize streaming object file */ 2503 Vcb->Volume->SectionObjectPointer = &(Vcb->SectionObject); 2504 Vcb->Volume->ReadAccess = TRUE; 2505 Vcb->Volume->WriteAccess = TRUE; 2506 Vcb->Volume->DeleteAccess = TRUE; 2507 Vcb->Volume->FsContext = (PVOID) Vcb; 2508 Vcb->Volume->FsContext2 = NULL; 2509 Vcb->Volume->Vpb = Vcb->Vpb; 2510 2511 FileSizes.AllocationSize.QuadPart = 2512 FileSizes.FileSize.QuadPart = 2513 FileSizes.ValidDataLength.QuadPart = 2514 Vcb->Header.AllocationSize.QuadPart; 2515 2516 CcInitializeCacheMap( Vcb->Volume, 2517 &FileSizes, 2518 TRUE, 2519 &(Ext2Global->CacheManagerNoOpCallbacks), 2520 Vcb ); 2521 2522 /* initialize disk block LargetMcb and entry Mcb, 2523 it will raise an expcetion if failed */ 2524 _SEH2_TRY { 2525 FsRtlInitializeLargeMcb(&(Vcb->Extents), PagedPool); 2526 } _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) { 2527 Status = STATUS_INSUFFICIENT_RESOURCES; 2528 DbgBreak(); 2529 } _SEH2_END; 2530 if (!NT_SUCCESS(Status)) { 2531 _SEH2_LEAVE; 2532 } 2533 ExtentsInitialized = TRUE; 2534 2535 /* set block device */ 2536 Vcb->bd.bd_dev = Vcb->RealDevice; 2537 Vcb->bd.bd_geo = Vcb->DiskGeometry; 2538 Vcb->bd.bd_part = Vcb->PartitionInformation; 2539 Vcb->bd.bd_volume = Vcb->Volume; 2540 Vcb->bd.bd_priv = (void *) Vcb; 2541 memset(&Vcb->bd.bd_bh_root, 0, sizeof(struct rb_root)); 2542 InitializeListHead(&Vcb->bd.bd_bh_free); 2543 ExInitializeResourceLite(&Vcb->bd.bd_bh_lock); 2544 KeInitializeEvent(&Vcb->bd.bd_bh_notify, 2545 NotificationEvent, TRUE); 2546 Vcb->bd.bd_bh_cache = kmem_cache_create("bd_bh_buffer", 2547 Vcb->BlockSize, 0, 0, NULL); 2548 if (!Vcb->bd.bd_bh_cache) { 2549 Status = STATUS_INSUFFICIENT_RESOURCES; 2550 _SEH2_LEAVE; 2551 } 2552 2553 Vcb->SectorBits = Ext2Log2(SECTOR_SIZE); 2554 Vcb->sb.s_magic = sb->s_magic; 2555 Vcb->sb.s_bdev = &Vcb->bd; 2556 Vcb->sb.s_blocksize = BLOCK_SIZE; 2557 Vcb->sb.s_blocksize_bits = BLOCK_BITS; 2558 Vcb->sb.s_priv = (void *) Vcb; 2559 Vcb->sb.s_fs_info = &Vcb->sbi; 2560 2561 Vcb->sbi.s_es = sb; 2562 Vcb->sbi.s_blocks_per_group = sb->s_blocks_per_group; 2563 Vcb->sbi.s_first_ino = sb->s_first_ino; 2564 Vcb->sbi.s_desc_size = sb->s_desc_size; 2565 2566 if (EXT3_HAS_INCOMPAT_FEATURE(&Vcb->sb, EXT4_FEATURE_INCOMPAT_64BIT)) { 2567 if (Vcb->sbi.s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 2568 Vcb->sbi.s_desc_size > EXT4_MAX_DESC_SIZE || 2569 !is_power_of_2(Vcb->sbi.s_desc_size)) { 2570 DEBUG(DL_ERR, ("EXT4-fs: unsupported descriptor size %lu\n", Vcb->sbi.s_desc_size)); 2571 Status = STATUS_DISK_CORRUPT_ERROR; 2572 _SEH2_LEAVE; 2573 } 2574 } else { 2575 Vcb->sbi.s_desc_size = EXT4_MIN_DESC_SIZE; 2576 } 2577 2578 Vcb->sbi.s_blocks_per_group = sb->s_blocks_per_group; 2579 Vcb->sbi.s_inodes_per_group = sb->s_inodes_per_group; 2580 if (EXT3_INODES_PER_GROUP(&Vcb->sb) == 0) { 2581 Status = STATUS_DISK_CORRUPT_ERROR; 2582 _SEH2_LEAVE; 2583 } 2584 Vcb->sbi.s_inodes_per_block = BLOCK_SIZE / Vcb->InodeSize; 2585 if (Vcb->sbi.s_inodes_per_block == 0) { 2586 Status = STATUS_DISK_CORRUPT_ERROR; 2587 _SEH2_LEAVE; 2588 } 2589 Vcb->sbi.s_itb_per_group = Vcb->sbi.s_inodes_per_group / 2590 Vcb->sbi.s_inodes_per_block; 2591 2592 2593 Vcb->sbi.s_desc_per_block = BLOCK_SIZE / GROUP_DESC_SIZE; 2594 Vcb->sbi.s_desc_per_block_bits = ilog2(Vcb->sbi.s_desc_per_block); 2595 2596 for (i=0; i < 4; i++) { 2597 Vcb->sbi.s_hash_seed[i] = sb->s_hash_seed[i]; 2598 } 2599 Vcb->sbi.s_def_hash_version = sb->s_def_hash_version; 2600 2601 if (le32_to_cpu(sb->s_rev_level) == EXT3_GOOD_OLD_REV && 2602 (EXT3_HAS_COMPAT_FEATURE(&Vcb->sb, ~0U) || 2603 EXT3_HAS_RO_COMPAT_FEATURE(&Vcb->sb, ~0U) || 2604 EXT3_HAS_INCOMPAT_FEATURE(&Vcb->sb, ~0U))) { 2605 printk(KERN_WARNING 2606 "EXT3-fs warning: feature flags set on rev 0 fs, " 2607 "running e2fsck is recommended\n"); 2608 } 2609 2610 /* 2611 * Check feature flags regardless of the revision level, since we 2612 * previously didn't change the revision level when setting the flags, 2613 * so there is a chance incompat flags are set on a rev 0 filesystem. 2614 */ 2615 features = EXT3_HAS_INCOMPAT_FEATURE(&Vcb->sb, ~EXT4_FEATURE_INCOMPAT_SUPP); 2616 if (features & EXT4_FEATURE_INCOMPAT_DIRDATA) { 2617 SetLongFlag(Vcb->Flags, VCB_READ_ONLY); 2618 ClearFlag(features, EXT4_FEATURE_INCOMPAT_DIRDATA); 2619 } 2620 if (features) { 2621 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of " 2622 "unsupported optional features (%x).\n", 2623 Vcb->sb.s_id, le32_to_cpu(features)); 2624 Status = STATUS_UNRECOGNIZED_VOLUME; 2625 _SEH2_LEAVE; 2626 } 2627 2628 features = EXT3_HAS_RO_COMPAT_FEATURE(&Vcb->sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); 2629 if (features) { 2630 printk(KERN_ERR "EXT3-fs: %s: unsupported optional features in this volume: (%x).\n", 2631 Vcb->sb.s_id, le32_to_cpu(features)); 2632 if (CanIWrite(Vcb)) { 2633 } else { 2634 SetLongFlag(Vcb->Flags, VCB_READ_ONLY); 2635 } 2636 } 2637 2638 has_huge_files = EXT3_HAS_RO_COMPAT_FEATURE(&Vcb->sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE); 2639 2640 Vcb->sb.s_maxbytes = ext3_max_size(BLOCK_BITS, has_huge_files); 2641 Vcb->max_bitmap_bytes = ext3_max_bitmap_size(BLOCK_BITS, 2642 has_huge_files); 2643 Vcb->max_bytes = ext3_max_size(BLOCK_BITS, has_huge_files); 2644 2645 /* calculate maximum file bocks ... */ 2646 { 2647 ULONG dwData[EXT2_BLOCK_TYPES] = {EXT2_NDIR_BLOCKS, 1, 1, 1}; 2648 ULONG i; 2649 2650 ASSERT(BLOCK_BITS == Ext2Log2(BLOCK_SIZE)); 2651 2652 Vcb->sbi.s_groups_count = (ULONG)(ext3_blocks_count(sb) - sb->s_first_data_block + 2653 sb->s_blocks_per_group - 1) / sb->s_blocks_per_group; 2654 2655 Vcb->max_data_blocks = 0; 2656 for (i = 0; i < EXT2_BLOCK_TYPES; i++) { 2657 if (BLOCK_BITS >= 12 && i == (EXT2_BLOCK_TYPES - 1)) { 2658 dwData[i] = 0x40000000; 2659 } else { 2660 dwData[i] = dwData[i] << ((BLOCK_BITS - 2) * i); 2661 } 2662 Vcb->max_blocks_per_layer[i] = dwData[i]; 2663 Vcb->max_data_blocks += Vcb->max_blocks_per_layer[i]; 2664 } 2665 } 2666 2667 Vcb->sbi.s_gdb_count = (Vcb->sbi.s_groups_count + Vcb->sbi.s_desc_per_block - 1) / 2668 Vcb->sbi.s_desc_per_block; 2669 /* load all gorup desc */ 2670 if (!Ext2LoadGroup(Vcb)) { 2671 Status = STATUS_UNSUCCESSFUL; 2672 _SEH2_LEAVE; 2673 } 2674 GroupLoaded = TRUE; 2675 2676 /* recovery journal since it's ext3 */ 2677 if (Vcb->IsExt3fs) { 2678 Ext2RecoverJournal(IrpContext, Vcb); 2679 if (IsFlagOn(Vcb->Flags, VCB_JOURNAL_RECOVER)) { 2680 SetLongFlag(Vcb->Flags, VCB_READ_ONLY); 2681 } 2682 } 2683 2684 /* Now allocating the mcb for root ... */ 2685 Buffer[0] = L'\\'; 2686 Buffer[1] = 0; 2687 RootNode.Buffer = Buffer; 2688 RootNode.MaximumLength = RootNode.Length = 2; 2689 Vcb->McbTree = Ext2AllocateMcb( 2690 Vcb, &RootNode, NULL, 2691 FILE_ATTRIBUTE_DIRECTORY 2692 ); 2693 if (!Vcb->McbTree) { 2694 DbgBreak(); 2695 Status = STATUS_UNSUCCESSFUL; 2696 _SEH2_LEAVE; 2697 } 2698 2699 Vcb->sb.s_root = Ext2BuildEntry(Vcb, NULL, &RootNode); 2700 if (!Vcb->sb.s_root) { 2701 DbgBreak(); 2702 Status = STATUS_UNSUCCESSFUL; 2703 _SEH2_LEAVE; 2704 } 2705 Vcb->sb.s_root->d_sb = &Vcb->sb; 2706 Vcb->sb.s_root->d_inode = &Vcb->McbTree->Inode; 2707 Vcb->McbTree->de = Vcb->sb.s_root; 2708 2709 /* load root inode */ 2710 Vcb->McbTree->Inode.i_ino = EXT2_ROOT_INO; 2711 Vcb->McbTree->Inode.i_sb = &Vcb->sb; 2712 if (!Ext2LoadInode(Vcb, &Vcb->McbTree->Inode)) { 2713 DbgBreak(); 2714 Status = STATUS_CANT_WAIT; 2715 _SEH2_LEAVE; 2716 } 2717 2718 /* initializeroot node */ 2719 Vcb->McbTree->CreationTime = Ext2NtTime(Vcb->McbTree->Inode.i_ctime); 2720 Vcb->McbTree->LastAccessTime = Ext2NtTime(Vcb->McbTree->Inode.i_atime); 2721 Vcb->McbTree->LastWriteTime = Ext2NtTime(Vcb->McbTree->Inode.i_mtime); 2722 Vcb->McbTree->ChangeTime = Ext2NtTime(Vcb->McbTree->Inode.i_mtime); 2723 2724 /* check bitmap if user specifies it */ 2725 if (IsFlagOn(Ext2Global->Flags, EXT2_CHECKING_BITMAP)) { 2726 Ext2CheckBitmapConsistency(IrpContext, Vcb); 2727 } 2728 2729 /* get anything doen, then refer target device */ 2730 ObReferenceObject(Vcb->TargetDeviceObject); 2731 2732 /* query parameters from registry */ 2733 Ext2PerformRegistryVolumeParams(Vcb); 2734 2735 SetLongFlag(Vcb->Flags, VCB_INITIALIZED); 2736 2737 } _SEH2_FINALLY { 2738 2739 if (!NT_SUCCESS(Status)) { 2740 2741 if (Vcb->McbTree) { 2742 Ext2FreeMcb(Vcb, Vcb->McbTree); 2743 } 2744 2745 if (InodeLookasideInitialized) { 2746 ExDeleteNPagedLookasideList(&(Vcb->InodeLookasideList)); 2747 } 2748 2749 if (ExtentsInitialized) { 2750 if (Vcb->bd.bd_bh_cache) { 2751 if (GroupLoaded) 2752 Ext2PutGroup(Vcb); 2753 kmem_cache_destroy(Vcb->bd.bd_bh_cache); 2754 } 2755 FsRtlUninitializeLargeMcb(&(Vcb->Extents)); 2756 } 2757 2758 if (Vcb->Volume) { 2759 if (Vcb->Volume->PrivateCacheMap) { 2760 Ext2SyncUninitializeCacheMap(Vcb->Volume); 2761 } 2762 ObDereferenceObject(Vcb->Volume); 2763 } 2764 2765 if (NotifySyncInitialized) { 2766 FsRtlNotifyUninitializeSync(&Vcb->NotifySync); 2767 } 2768 2769 if (VcbResourceInitialized) { 2770 ExDeleteResourceLite(&Vcb->FcbLock); 2771 ExDeleteResourceLite(&Vcb->McbLock); 2772 ExDeleteResourceLite(&Vcb->MetaInode); 2773 ExDeleteResourceLite(&Vcb->MetaBlock); 2774 ExDeleteResourceLite(&Vcb->sbi.s_gd_lock); 2775 ExDeleteResourceLite(&Vcb->MainResource); 2776 ExDeleteResourceLite(&Vcb->PagingIoResource); 2777 } 2778 } 2779 } _SEH2_END; 2780 2781 return Status; 2782 } 2783 2784 2785 VOID 2786 Ext2TearDownStream(IN PEXT2_VCB Vcb) 2787 { 2788 PFILE_OBJECT Stream = Vcb->Volume; 2789 IO_STATUS_BLOCK IoStatus; 2790 2791 ASSERT(Vcb != NULL); 2792 ASSERT((Vcb->Identifier.Type == EXT2VCB) && 2793 (Vcb->Identifier.Size == sizeof(EXT2_VCB))); 2794 2795 if (Stream) { 2796 2797 Vcb->Volume = NULL; 2798 2799 if (IsFlagOn(Stream->Flags, FO_FILE_MODIFIED)) { 2800 CcFlushCache(&(Vcb->SectionObject), NULL, 0, &IoStatus); 2801 ClearFlag(Stream->Flags, FO_FILE_MODIFIED); 2802 } 2803 2804 if (Stream->PrivateCacheMap) { 2805 Ext2SyncUninitializeCacheMap(Stream); 2806 } 2807 2808 ObDereferenceObject(Stream); 2809 } 2810 } 2811 2812 VOID 2813 Ext2DestroyVcb (IN PEXT2_VCB Vcb) 2814 { 2815 ASSERT(Vcb != NULL); 2816 ASSERT((Vcb->Identifier.Type == EXT2VCB) && 2817 (Vcb->Identifier.Size == sizeof(EXT2_VCB))); 2818 2819 DEBUG(DL_FUN, ("Ext2DestroyVcb ...\n")); 2820 2821 if (Vcb->Volume) { 2822 Ext2TearDownStream(Vcb); 2823 } 2824 ASSERT(NULL == Vcb->Volume); 2825 2826 FsRtlNotifyUninitializeSync(&Vcb->NotifySync); 2827 Ext2ListExtents(&Vcb->Extents); 2828 FsRtlUninitializeLargeMcb(&(Vcb->Extents)); 2829 2830 Ext2CleanupAllMcbs(Vcb); 2831 2832 Ext2DropBH(Vcb); 2833 2834 if (Vcb->bd.bd_bh_cache) 2835 kmem_cache_destroy(Vcb->bd.bd_bh_cache); 2836 ExDeleteResourceLite(&Vcb->bd.bd_bh_lock); 2837 2838 if (Vcb->SuperBlock) { 2839 Ext2FreePool(Vcb->SuperBlock, EXT2_SB_MAGIC); 2840 Vcb->SuperBlock = NULL; 2841 } 2842 2843 if (IsFlagOn(Vcb->Flags, VCB_NEW_VPB)) { 2844 ASSERT(Vcb->Vpb2 != NULL); 2845 DEBUG(DL_DBG, ("Ext2DestroyVcb: Vpb2 to be freed: %p\n", Vcb->Vpb2)); 2846 ExFreePoolWithTag(Vcb->Vpb2, TAG_VPB); 2847 DEC_MEM_COUNT(PS_VPB, Vcb->Vpb2, sizeof(VPB)); 2848 Vcb->Vpb2 = NULL; 2849 } 2850 2851 ObDereferenceObject(Vcb->TargetDeviceObject); 2852 2853 ExDeleteNPagedLookasideList(&(Vcb->InodeLookasideList)); 2854 ExDeleteResourceLite(&Vcb->FcbLock); 2855 ExDeleteResourceLite(&Vcb->McbLock); 2856 ExDeleteResourceLite(&Vcb->MetaInode); 2857 ExDeleteResourceLite(&Vcb->MetaBlock); 2858 ExDeleteResourceLite(&Vcb->sbi.s_gd_lock); 2859 ExDeleteResourceLite(&Vcb->PagingIoResource); 2860 ExDeleteResourceLite(&Vcb->MainResource); 2861 2862 DEBUG(DL_DBG, ("Ext2DestroyVcb: DevObject=%p Vcb=%p\n", Vcb->DeviceObject, Vcb)); 2863 IoDeleteDevice(Vcb->DeviceObject); 2864 DEC_MEM_COUNT(PS_VCB, Vcb->DeviceObject, sizeof(EXT2_VCB)); 2865 } 2866 2867 2868 /* uninitialize cache map */ 2869 2870 VOID 2871 Ext2SyncUninitializeCacheMap ( 2872 IN PFILE_OBJECT FileObject 2873 ) 2874 { 2875 CACHE_UNINITIALIZE_EVENT UninitializeCompleteEvent; 2876 NTSTATUS WaitStatus; 2877 LARGE_INTEGER Ext2LargeZero = {0,0}; 2878 2879 2880 KeInitializeEvent( &UninitializeCompleteEvent.Event, 2881 SynchronizationEvent, 2882 FALSE); 2883 2884 CcUninitializeCacheMap( FileObject, 2885 &Ext2LargeZero, 2886 &UninitializeCompleteEvent ); 2887 2888 WaitStatus = KeWaitForSingleObject( &UninitializeCompleteEvent.Event, 2889 Executive, 2890 KernelMode, 2891 FALSE, 2892 NULL); 2893 2894 ASSERT (NT_SUCCESS(WaitStatus)); 2895 } 2896 2897 /* Link Mcb to tail of Vcb->McbList queue */ 2898 2899 VOID 2900 Ext2LinkTailMcb(PEXT2_VCB Vcb, PEXT2_MCB Mcb) 2901 { 2902 if (Mcb->Inode.i_ino == EXT2_ROOT_INO) { 2903 return; 2904 } 2905 2906 ExAcquireResourceExclusiveLite(&Vcb->McbLock, TRUE); 2907 2908 if (IsFlagOn(Mcb->Flags, MCB_VCB_LINK)) { 2909 DEBUG(DL_RES, ( "Ext2LinkTailMcb: %wZ already linked.\n", 2910 &Mcb->FullName)); 2911 } else { 2912 InsertTailList(&Vcb->McbList, &Mcb->Link); 2913 SetLongFlag(Mcb->Flags, MCB_VCB_LINK); 2914 Ext2ReferXcb(&Vcb->NumOfMcb); 2915 } 2916 2917 ExReleaseResourceLite(&Vcb->McbLock); 2918 } 2919 2920 /* Link Mcb to head of Vcb->McbList queue */ 2921 2922 VOID 2923 Ext2LinkHeadMcb(PEXT2_VCB Vcb, PEXT2_MCB Mcb) 2924 { 2925 if (Mcb->Inode.i_ino == EXT2_ROOT_INO) { 2926 return; 2927 } 2928 2929 ExAcquireResourceExclusiveLite(&Vcb->McbLock, TRUE); 2930 2931 if (!IsFlagOn(Mcb->Flags, MCB_VCB_LINK)) { 2932 InsertHeadList(&Vcb->McbList, &Mcb->Link); 2933 SetLongFlag(Mcb->Flags, MCB_VCB_LINK); 2934 Ext2ReferXcb(&Vcb->NumOfMcb); 2935 } else { 2936 DEBUG(DL_RES, ( "Ext2LinkHeadMcb: %wZ already linked.\n", 2937 &Mcb->FullName)); 2938 } 2939 ExReleaseResourceLite(&Vcb->McbLock); 2940 } 2941 2942 /* Unlink Mcb from Vcb->McbList queue */ 2943 2944 VOID 2945 Ext2UnlinkMcb(PEXT2_VCB Vcb, PEXT2_MCB Mcb) 2946 { 2947 if (Mcb->Inode.i_ino == EXT2_ROOT_INO) { 2948 return; 2949 } 2950 2951 ExAcquireResourceExclusiveLite(&Vcb->McbLock, TRUE); 2952 2953 if (IsFlagOn(Mcb->Flags, MCB_VCB_LINK)) { 2954 RemoveEntryList(&(Mcb->Link)); 2955 ClearLongFlag(Mcb->Flags, MCB_VCB_LINK); 2956 Ext2DerefXcb(&Vcb->NumOfMcb); 2957 } else { 2958 DEBUG(DL_RES, ( "Ext2UnlinkMcb: %wZ already unlinked.\n", 2959 &Mcb->FullName)); 2960 } 2961 ExReleaseResourceLite(&Vcb->McbLock); 2962 } 2963 2964 /* get the first Mcb record in Vcb->McbList */ 2965 2966 PEXT2_MCB 2967 Ext2FirstUnusedMcb(PEXT2_VCB Vcb, BOOLEAN Wait, ULONG Number) 2968 { 2969 PEXT2_MCB Head = NULL; 2970 PEXT2_MCB Tail = NULL; 2971 PEXT2_MCB Mcb = NULL; 2972 PLIST_ENTRY List = NULL; 2973 ULONG i = 0; 2974 LARGE_INTEGER start, now; 2975 2976 if (!ExAcquireResourceExclusiveLite(&Vcb->McbLock, Wait)) { 2977 return NULL; 2978 } 2979 2980 KeQuerySystemTime(&start); 2981 2982 while (Number--) { 2983 2984 BOOLEAN Skip = TRUE; 2985 2986 if (IsListEmpty(&Vcb->McbList)) { 2987 break; 2988 } 2989 2990 while (i++ < Vcb->NumOfMcb) { 2991 2992 KeQuerySystemTime(&now); 2993 if (now.QuadPart > start.QuadPart + (LONGLONG)10*1000*1000) { 2994 break; 2995 } 2996 2997 List = RemoveHeadList(&Vcb->McbList); 2998 Mcb = CONTAINING_RECORD(List, EXT2_MCB, Link); 2999 ASSERT(IsFlagOn(Mcb->Flags, MCB_VCB_LINK)); 3000 3001 if (Mcb->Fcb == NULL && !IsMcbRoot(Mcb) && 3002 Mcb->Refercount == 0 && 3003 (Mcb->Child == NULL || IsMcbSymLink(Mcb))) { 3004 3005 Ext2RemoveMcb(Vcb, Mcb); 3006 ClearLongFlag(Mcb->Flags, MCB_VCB_LINK); 3007 Ext2DerefXcb(&Vcb->NumOfMcb); 3008 3009 /* attach all Mcb into a chain*/ 3010 if (Head) { 3011 ASSERT(Tail != NULL); 3012 Tail->Next = Mcb; 3013 Tail = Mcb; 3014 } else { 3015 Head = Tail = Mcb; 3016 } 3017 Tail->Next = NULL; 3018 Skip = FALSE; 3019 3020 } else { 3021 3022 InsertTailList(&Vcb->McbList, &Mcb->Link); 3023 Mcb = NULL; 3024 } 3025 } 3026 3027 if (Skip) 3028 break; 3029 } 3030 3031 ExReleaseResourceLite(&Vcb->McbLock); 3032 3033 return Head; 3034 } 3035 3036 3037 /* Reaper thread to release unused Mcb blocks */ 3038 VOID NTAPI 3039 Ext2McbReaperThread( 3040 PVOID Context 3041 ) 3042 { 3043 PEXT2_REAPER Reaper = Context; 3044 PLIST_ENTRY List = NULL; 3045 LARGE_INTEGER Timeout; 3046 3047 PEXT2_VCB Vcb = NULL; 3048 PEXT2_MCB Mcb = NULL; 3049 3050 ULONG i, NumOfMcbs; 3051 3052 BOOLEAN GlobalAcquired = FALSE; 3053 3054 BOOLEAN DidNothing = TRUE; 3055 BOOLEAN LastState = TRUE; 3056 BOOLEAN WaitLock; 3057 3058 _SEH2_TRY { 3059 3060 Reaper->Thread = PsGetCurrentThread(); 3061 3062 /* wake up DirverEntry */ 3063 KeSetEvent(&Reaper->Engine, 0, FALSE); 3064 3065 /* now process looping */ 3066 while (!IsFlagOn(Reaper->Flags, EXT2_REAPER_FLAG_STOP)) { 3067 3068 WaitLock = FALSE; 3069 3070 /* calculate how long we need wait */ 3071 if (Ext2Global->PerfStat.Current.Mcb > (((ULONG)Ext2Global->MaxDepth) * 128)) { 3072 Timeout.QuadPart = (LONGLONG)-1000*1000; /* 0.1 second */ 3073 NumOfMcbs = Ext2Global->MaxDepth * 4; 3074 WaitLock = TRUE; 3075 } else if (Ext2Global->PerfStat.Current.Mcb > (((ULONG)Ext2Global->MaxDepth) * 32)) { 3076 Timeout.QuadPart = (LONGLONG)-1000*1000*5; /* 0.5 second */ 3077 NumOfMcbs = Ext2Global->MaxDepth * 2; 3078 WaitLock = TRUE; 3079 } else if (Ext2Global->PerfStat.Current.Mcb > (((ULONG)Ext2Global->MaxDepth) * 8)) { 3080 Timeout.QuadPart = (LONGLONG)-1000*1000*10; /* 1 second */ 3081 NumOfMcbs = Ext2Global->MaxDepth; 3082 } else if (Ext2Global->PerfStat.Current.Mcb > (((ULONG)Ext2Global->MaxDepth) * 2)) { 3083 Timeout.QuadPart = (LONGLONG)-2*1000*1000*10; /* 2 second */ 3084 NumOfMcbs = Ext2Global->MaxDepth / 4; 3085 } else if (Ext2Global->PerfStat.Current.Mcb > (ULONG)Ext2Global->MaxDepth) { 3086 Timeout.QuadPart = (LONGLONG)-4*1000*1000*10; /* 4 seconds */ 3087 NumOfMcbs = Ext2Global->MaxDepth / 8; 3088 } else if (DidNothing) { 3089 Timeout.QuadPart = (LONGLONG)-8*1000*1000*10; /* 8 seconds */ 3090 if (LastState) { 3091 Timeout.QuadPart *= 2; 3092 } 3093 NumOfMcbs = Ext2Global->MaxDepth / 16; 3094 } else { 3095 Timeout.QuadPart = (LONGLONG)-5*1000*1000*10; /* 5 seconds */ 3096 if (LastState) { 3097 Timeout.QuadPart *= 2; 3098 } 3099 NumOfMcbs = Ext2Global->MaxDepth / 32; 3100 } 3101 3102 if (NumOfMcbs == 0) 3103 NumOfMcbs = 1; 3104 3105 LastState = DidNothing; 3106 3107 /* wait until it is waken or it times out */ 3108 KeWaitForSingleObject( 3109 &Reaper->Wait, 3110 Executive, 3111 KernelMode, 3112 FALSE, 3113 &Timeout 3114 ); 3115 3116 if (IsFlagOn(Reaper->Flags, EXT2_REAPER_FLAG_STOP)) 3117 break; 3118 3119 DidNothing = TRUE; 3120 3121 /* acquire global exclusive lock */ 3122 if (!ExAcquireResourceSharedLite(&Ext2Global->Resource, WaitLock)) { 3123 continue; 3124 } 3125 GlobalAcquired = TRUE; 3126 3127 /* search all Vcb to get unused resources freed to system */ 3128 for (List = Ext2Global->VcbList.Flink; 3129 List != &(Ext2Global->VcbList); 3130 List = List->Flink ) { 3131 3132 Vcb = CONTAINING_RECORD(List, EXT2_VCB, Next); 3133 3134 Mcb = Ext2FirstUnusedMcb(Vcb, WaitLock, NumOfMcbs); 3135 while (Mcb) { 3136 PEXT2_MCB Next = Mcb->Next; 3137 DEBUG(DL_RES, ( "Ext2ReaperThread: releasing Mcb (%p): %wZ" 3138 " Total: %xh\n", Mcb, &Mcb->FullName, 3139 Ext2Global->PerfStat.Current.Mcb)); 3140 Ext2FreeMcb(Vcb, Mcb); 3141 Mcb = Next; 3142 LastState = DidNothing = FALSE; 3143 } 3144 } 3145 if (DidNothing) { 3146 KeClearEvent(&Reaper->Wait); 3147 } 3148 if (GlobalAcquired) { 3149 ExReleaseResourceLite(&Ext2Global->Resource); 3150 GlobalAcquired = FALSE; 3151 } 3152 } 3153 3154 } _SEH2_FINALLY { 3155 3156 if (GlobalAcquired) { 3157 ExReleaseResourceLite(&Ext2Global->Resource); 3158 } 3159 3160 KeSetEvent(&Reaper->Engine, 0, FALSE); 3161 } _SEH2_END; 3162 3163 PsTerminateSystemThread(STATUS_SUCCESS); 3164 } 3165 3166 3167 /* get buffer heads from global Vcb BH list */ 3168 3169 BOOLEAN 3170 Ext2QueryUnusedBH(PEXT2_VCB Vcb, PLIST_ENTRY head) 3171 { 3172 struct buffer_head *bh = NULL; 3173 PLIST_ENTRY next = NULL; 3174 LARGE_INTEGER start, now; 3175 BOOLEAN wake = FALSE; 3176 3177 KeQuerySystemTime(&start); 3178 3179 ExAcquireResourceExclusiveLite(&Vcb->bd.bd_bh_lock, TRUE); 3180 3181 while (!IsListEmpty(&Vcb->bd.bd_bh_free)) { 3182 3183 KeQuerySystemTime(&now); 3184 if (now.QuadPart > start.QuadPart + (LONGLONG)10*1000*1000) { 3185 break; 3186 } 3187 3188 next = RemoveHeadList(&Vcb->bd.bd_bh_free); 3189 bh = CONTAINING_RECORD(next, struct buffer_head, b_link); 3190 if (atomic_read(&bh->b_count)) { 3191 InitializeListHead(&bh->b_link); 3192 /* to be inserted by brelse */ 3193 continue; 3194 } 3195 3196 if ( IsFlagOn(Vcb->Flags, VCB_BEING_DROPPED) || 3197 (bh->b_ts_drop.QuadPart + (LONGLONG)10*1000*1000*15) > now.QuadPart || 3198 (bh->b_ts_creat.QuadPart + (LONGLONG)10*1000*1000*180) > now.QuadPart) { 3199 InsertTailList(head, &bh->b_link); 3200 buffer_head_remove(&Vcb->bd, bh); 3201 } else { 3202 InsertHeadList(&Vcb->bd.bd_bh_free, &bh->b_link); 3203 break; 3204 } 3205 } 3206 3207 wake = IsListEmpty(&Vcb->bd.bd_bh_free); 3208 ExReleaseResourceLite(&Vcb->bd.bd_bh_lock); 3209 3210 if (wake) 3211 KeSetEvent(&Vcb->bd.bd_bh_notify, 0, FALSE); 3212 3213 return IsFlagOn(Vcb->Flags, VCB_BEING_DROPPED); 3214 } 3215 3216 3217 /* Reaper thread to release unused buffer heads */ 3218 VOID NTAPI 3219 Ext2bhReaperThread( 3220 PVOID Context 3221 ) 3222 { 3223 PEXT2_REAPER Reaper = Context; 3224 PEXT2_VCB Vcb = NULL; 3225 LIST_ENTRY List, *Link; 3226 LARGE_INTEGER Timeout; 3227 3228 BOOLEAN GlobalAcquired = FALSE; 3229 BOOLEAN DidNothing = FALSE; 3230 BOOLEAN NonWait = FALSE; 3231 3232 _SEH2_TRY { 3233 3234 Reaper->Thread = PsGetCurrentThread(); 3235 3236 /* wake up DirverEntry */ 3237 KeSetEvent(&Reaper->Engine, 0, FALSE); 3238 3239 /* now process looping */ 3240 while (!IsFlagOn(Reaper->Flags, EXT2_REAPER_FLAG_STOP)) { 3241 3242 /* wait until it is waken or it times out */ 3243 if (NonWait) { 3244 Timeout.QuadPart = (LONGLONG)-10*1000*10; 3245 NonWait = FALSE; 3246 } else if (DidNothing) { 3247 Timeout.QuadPart = Timeout.QuadPart * 2; 3248 } else { 3249 Timeout.QuadPart = (LONGLONG)-10*1000*1000*10; /* 10 seconds */ 3250 } 3251 KeWaitForSingleObject( 3252 &Reaper->Wait, 3253 Executive, 3254 KernelMode, 3255 FALSE, 3256 &Timeout 3257 ); 3258 3259 if (IsFlagOn(Reaper->Flags, EXT2_REAPER_FLAG_STOP)) 3260 break; 3261 3262 InitializeListHead(&List); 3263 3264 /* acquire global exclusive lock */ 3265 ExAcquireResourceSharedLite(&Ext2Global->Resource, TRUE); 3266 GlobalAcquired = TRUE; 3267 /* search all Vcb to get unused resources freed to system */ 3268 for (Link = Ext2Global->VcbList.Flink; 3269 Link != &(Ext2Global->VcbList); 3270 Link = Link->Flink ) { 3271 3272 Vcb = CONTAINING_RECORD(Link, EXT2_VCB, Next); 3273 NonWait = Ext2QueryUnusedBH(Vcb, &List); 3274 } 3275 DidNothing = IsListEmpty(&List); 3276 if (DidNothing) { 3277 KeClearEvent(&Reaper->Wait); 3278 } 3279 if (GlobalAcquired) { 3280 ExReleaseResourceLite(&Ext2Global->Resource); 3281 GlobalAcquired = FALSE; 3282 } 3283 3284 while (!IsListEmpty(&List)) { 3285 struct buffer_head *bh; 3286 Link = RemoveHeadList(&List); 3287 bh = CONTAINING_RECORD(Link, struct buffer_head, b_link); 3288 ASSERT(0 == atomic_read(&bh->b_count)); 3289 free_buffer_head(bh); 3290 } 3291 } 3292 3293 } _SEH2_FINALLY { 3294 3295 if (GlobalAcquired) { 3296 ExReleaseResourceLite(&Ext2Global->Resource); 3297 } 3298 3299 KeSetEvent(&Reaper->Engine, 0, FALSE); 3300 } _SEH2_END; 3301 3302 PsTerminateSystemThread(STATUS_SUCCESS); 3303 } 3304 3305 /* get unused Fcbs to free */ 3306 3307 BOOLEAN 3308 Ext2QueryUnusedFcb(PEXT2_VCB Vcb, PLIST_ENTRY list) 3309 { 3310 PEXT2_FCB Fcb; 3311 PLIST_ENTRY next = NULL; 3312 LARGE_INTEGER start, now; 3313 3314 ULONG count = 0; 3315 ULONG tries = 0; 3316 BOOLEAN wake = FALSE; 3317 BOOLEAN retry = TRUE; 3318 3319 KeQuerySystemTime(&start); 3320 3321 ExAcquireResourceExclusiveLite(&Vcb->FcbLock, TRUE); 3322 3323 again: 3324 3325 KeQuerySystemTime(&now); 3326 while (!IsListEmpty(&Vcb->FcbList)) { 3327 3328 next = RemoveHeadList(&Vcb->FcbList); 3329 Fcb = CONTAINING_RECORD(next, EXT2_FCB, Next); 3330 3331 if (Fcb->ReferenceCount > 0) { 3332 InsertTailList(&Vcb->FcbList, &Fcb->Next); 3333 break; 3334 } 3335 3336 retry = FALSE; 3337 3338 if (now.QuadPart < Fcb->TsDrop.QuadPart + 10*1000*1000*120) { 3339 InsertHeadList(&Vcb->FcbList, &Fcb->Next); 3340 break; 3341 } 3342 3343 Ext2UnlinkFcb(Fcb); 3344 Ext2DerefXcb(&Vcb->FcbCount); 3345 InsertTailList(list, &Fcb->Next); 3346 if (++count >= Ext2Global->MaxDepth) { 3347 break; 3348 } 3349 } 3350 3351 if (start.QuadPart + 10*1000*1000 > now.QuadPart) { 3352 retry = FALSE; 3353 } 3354 3355 if (retry) { 3356 if (++tries < (Vcb->FcbCount >> 4) ) 3357 goto again; 3358 } 3359 3360 ExReleaseResourceLite(&Vcb->FcbLock); 3361 3362 return 0; 3363 } 3364 3365 /* Reaper thread to release Fcb */ 3366 VOID NTAPI 3367 Ext2FcbReaperThread( 3368 PVOID Context 3369 ) 3370 { 3371 PEXT2_REAPER Reaper = Context; 3372 PEXT2_VCB Vcb = NULL; 3373 LIST_ENTRY List, *Link; 3374 LARGE_INTEGER Timeout; 3375 3376 BOOLEAN GlobalAcquired = FALSE; 3377 BOOLEAN DidNothing = FALSE; 3378 BOOLEAN NonWait = FALSE; 3379 3380 _SEH2_TRY { 3381 3382 Reaper->Thread = PsGetCurrentThread(); 3383 3384 /* wake up DirverEntry */ 3385 KeSetEvent(&Reaper->Engine, 0, FALSE); 3386 3387 /* now process looping */ 3388 while (!IsFlagOn(Reaper->Flags, EXT2_REAPER_FLAG_STOP)) { 3389 3390 /* wait until it is waken or it times out */ 3391 if (NonWait) { 3392 Timeout.QuadPart = (LONGLONG)-10*1000*100; 3393 NonWait = FALSE; 3394 } else if (DidNothing) { 3395 Timeout.QuadPart = Timeout.QuadPart * 2; 3396 } else { 3397 Timeout.QuadPart = (LONGLONG)-10*1000*1000*20; /* 20 seconds */ 3398 } 3399 KeWaitForSingleObject( 3400 &Reaper->Wait, 3401 Executive, 3402 KernelMode, 3403 FALSE, 3404 &Timeout 3405 ); 3406 3407 if (IsFlagOn(Reaper->Flags, EXT2_REAPER_FLAG_STOP)) 3408 break; 3409 3410 InitializeListHead(&List); 3411 3412 /* acquire global exclusive lock */ 3413 ExAcquireResourceSharedLite(&Ext2Global->Resource, TRUE); 3414 GlobalAcquired = TRUE; 3415 /* search all Vcb to get unused resources freed to system */ 3416 for (Link = Ext2Global->VcbList.Flink; 3417 Link != &(Ext2Global->VcbList); 3418 Link = Link->Flink ) { 3419 3420 Vcb = CONTAINING_RECORD(Link, EXT2_VCB, Next); 3421 NonWait = Ext2QueryUnusedFcb(Vcb, &List); 3422 } 3423 DidNothing = IsListEmpty(&List); 3424 if (DidNothing) { 3425 KeClearEvent(&Reaper->Wait); 3426 } 3427 if (GlobalAcquired) { 3428 ExReleaseResourceLite(&Ext2Global->Resource); 3429 GlobalAcquired = FALSE; 3430 } 3431 3432 while (!IsListEmpty(&List)) { 3433 PEXT2_FCB Fcb; 3434 Link = RemoveHeadList(&List); 3435 Fcb = CONTAINING_RECORD(Link, EXT2_FCB, Next); 3436 ASSERT(0 == Fcb->ReferenceCount); 3437 Ext2FreeFcb(Fcb); 3438 } 3439 } 3440 3441 } _SEH2_FINALLY { 3442 3443 if (GlobalAcquired) { 3444 ExReleaseResourceLite(&Ext2Global->Resource); 3445 } 3446 3447 KeSetEvent(&Reaper->Engine, 0, FALSE); 3448 } _SEH2_END; 3449 3450 PsTerminateSystemThread(STATUS_SUCCESS); 3451 } 3452 3453 NTSTATUS 3454 Ext2StartReaper(PEXT2_REAPER Reaper, EXT2_REAPER_RELEASE Free) 3455 { 3456 NTSTATUS status = STATUS_SUCCESS; 3457 OBJECT_ATTRIBUTES oa; 3458 HANDLE handle = 0; 3459 LARGE_INTEGER timeout; 3460 3461 Reaper->Free = Free; 3462 3463 /* initialize wait event */ 3464 KeInitializeEvent( 3465 &Reaper->Wait, 3466 SynchronizationEvent, FALSE 3467 ); 3468 3469 /* Reaper thread engine event */ 3470 KeInitializeEvent( 3471 &Reaper->Engine, 3472 SynchronizationEvent, FALSE 3473 ); 3474 3475 /* initialize oa */ 3476 InitializeObjectAttributes( 3477 &oa, 3478 NULL, 3479 OBJ_CASE_INSENSITIVE | 3480 OBJ_KERNEL_HANDLE, 3481 NULL, 3482 NULL 3483 ); 3484 3485 /* start a new system thread */ 3486 status = PsCreateSystemThread( 3487 &handle, 3488 0, 3489 &oa, 3490 NULL, 3491 NULL, 3492 Free, 3493 (PVOID)Reaper 3494 ); 3495 3496 if (NT_SUCCESS(status)) { 3497 ZwClose(handle); 3498 3499 /* make sure Reaperthread is started */ 3500 timeout.QuadPart = (LONGLONG)-10*1000*1000*2; /* 2 seconds */ 3501 status = KeWaitForSingleObject( 3502 &Reaper->Engine, 3503 Executive, 3504 KernelMode, 3505 FALSE, 3506 &timeout 3507 ); 3508 if (status != STATUS_SUCCESS) { 3509 status = STATUS_INSUFFICIENT_RESOURCES; 3510 } 3511 } 3512 3513 return status; 3514 } 3515 3516 3517 VOID NTAPI 3518 Ext2StopReaper(PEXT2_REAPER Reaper) 3519 { 3520 LARGE_INTEGER timeout; 3521 3522 Reaper->Flags |= EXT2_REAPER_FLAG_STOP; 3523 KeSetEvent(&Reaper->Wait, 0, FALSE); 3524 3525 /* make sure Reaperthread is started */ 3526 timeout.QuadPart = (LONGLONG)-10*1000*1000*2; /* 2 seconds */ 3527 KeWaitForSingleObject( 3528 &Reaper->Engine, 3529 Executive, 3530 KernelMode, 3531 FALSE, 3532 &timeout); 3533 } 3534