+++ /dev/null
-/*
-* FILE: drivers/filesystems/fastfat/fcb.c
-* PURPOSE: Routines to manipulate FCBs.
-* COPYRIGHT: See COPYING in the top level directory
-* PROJECT: ReactOS kernel
-* PROGRAMMER: Jason Filby (jasonfilby@yahoo.com)
-* Rex Jolliff (rex@lvcablemodem.com)
-* Herve Poussineau (reactos@poussine.freesurf.fr)
-* Pierre Schweitzer (pierre@reactos.org)
-*/
-
-/* ------------------------------------------------------- INCLUDES */
-
-#include "vfat.h"
-
-#define NDEBUG
-#include <debug.h>
-
-#ifdef __GNUC__
-#include <wctype.h> /* towlower prototype */
-#endif
-
-/* -------------------------------------------------------- DEFINES */
-
-#define TAG_FCB 'BCFV'
-
-/* -------------------------------------------------------- PUBLICS */
-
-static
-ULONG
-vfatNameHash(
- ULONG hash,
- PUNICODE_STRING NameU)
-{
- PWCHAR last;
- PWCHAR curr;
- register WCHAR c;
-
- // LFN could start from "."
- //ASSERT(NameU->Buffer[0] != L'.');
- curr = NameU->Buffer;
- last = NameU->Buffer + NameU->Length / sizeof(WCHAR);
-
- while(curr < last)
- {
- c = towlower(*curr++);
- hash = (hash + (c << 4) + (c >> 4)) * 11;
- }
- return hash;
-}
-
-VOID
-vfatSplitPathName(
- PUNICODE_STRING PathNameU,
- PUNICODE_STRING DirNameU,
- PUNICODE_STRING FileNameU)
-{
- PWCHAR pName;
- USHORT Length = 0;
- pName = PathNameU->Buffer + PathNameU->Length / sizeof(WCHAR) - 1;
- while (*pName != L'\\' && pName >= PathNameU->Buffer)
- {
- pName--;
- Length++;
- }
- ASSERT(*pName == L'\\' || pName < PathNameU->Buffer);
- if (FileNameU)
- {
- FileNameU->Buffer = pName + 1;
- FileNameU->Length = FileNameU->MaximumLength = Length * sizeof(WCHAR);
- }
- if (DirNameU)
- {
- DirNameU->Buffer = PathNameU->Buffer;
- DirNameU->Length = (pName + 1 - PathNameU->Buffer) * sizeof(WCHAR);
- DirNameU->MaximumLength = DirNameU->Length;
- }
-}
-
-static
-VOID
-vfatInitFcb(
- PVFATFCB Fcb,
- PUNICODE_STRING NameU)
-{
- USHORT PathNameBufferLength;
-
- if (NameU)
- PathNameBufferLength = NameU->Length + sizeof(WCHAR);
- else
- PathNameBufferLength = 0;
-
- Fcb->PathNameBuffer = ExAllocatePoolWithTag(NonPagedPool, PathNameBufferLength, TAG_FCB);
- if (!Fcb->PathNameBuffer)
- {
- /* FIXME: what to do if no more memory? */
- DPRINT1("Unable to initialize FCB for filename '%wZ'\n", NameU);
- KeBugCheckEx(FAT_FILE_SYSTEM, (ULONG_PTR)Fcb, (ULONG_PTR)NameU, 0, 0);
- }
-
- Fcb->PathNameU.Length = 0;
- Fcb->PathNameU.Buffer = Fcb->PathNameBuffer;
- Fcb->PathNameU.MaximumLength = PathNameBufferLength;
- Fcb->ShortNameU.Length = 0;
- Fcb->ShortNameU.Buffer = Fcb->ShortNameBuffer;
- Fcb->ShortNameU.MaximumLength = sizeof(Fcb->ShortNameBuffer);
- Fcb->DirNameU.Buffer = Fcb->PathNameU.Buffer;
- if (NameU && NameU->Length)
- {
- RtlCopyUnicodeString(&Fcb->PathNameU, NameU);
- vfatSplitPathName(&Fcb->PathNameU, &Fcb->DirNameU, &Fcb->LongNameU);
- }
- else
- {
- Fcb->DirNameU.Buffer = Fcb->LongNameU.Buffer = NULL;
- Fcb->DirNameU.MaximumLength = Fcb->DirNameU.Length = 0;
- Fcb->LongNameU.MaximumLength = Fcb->LongNameU.Length = 0;
- }
- RtlZeroMemory(&Fcb->FCBShareAccess, sizeof(SHARE_ACCESS));
- Fcb->OpenHandleCount = 0;
-}
-
-PVFATFCB
-vfatNewFCB(
- PDEVICE_EXTENSION pVCB,
- PUNICODE_STRING pFileNameU)
-{
- PVFATFCB rcFCB;
-
- DPRINT("'%wZ'\n", pFileNameU);
-
- rcFCB = ExAllocateFromNPagedLookasideList(&VfatGlobalData->FcbLookasideList);
- if (rcFCB == NULL)
- {
- return NULL;
- }
- RtlZeroMemory(rcFCB, sizeof(VFATFCB));
- vfatInitFcb(rcFCB, pFileNameU);
- if (vfatVolumeIsFatX(pVCB))
- rcFCB->Attributes = &rcFCB->entry.FatX.Attrib;
- else
- rcFCB->Attributes = &rcFCB->entry.Fat.Attrib;
- rcFCB->Hash.Hash = vfatNameHash(0, &rcFCB->PathNameU);
- rcFCB->Hash.self = rcFCB;
- rcFCB->ShortHash.self = rcFCB;
- ExInitializeResourceLite(&rcFCB->PagingIoResource);
- ExInitializeResourceLite(&rcFCB->MainResource);
- FsRtlInitializeFileLock(&rcFCB->FileLock, NULL, NULL);
- ExInitializeFastMutex(&rcFCB->LastMutex);
- rcFCB->RFCB.PagingIoResource = &rcFCB->PagingIoResource;
- rcFCB->RFCB.Resource = &rcFCB->MainResource;
- rcFCB->RFCB.IsFastIoPossible = FastIoIsNotPossible;
- InitializeListHead(&rcFCB->ParentListHead);
-
- return rcFCB;
-}
-
-static
-VOID
-vfatDelFCBFromTable(
- PDEVICE_EXTENSION pVCB,
- PVFATFCB pFCB)
-{
- ULONG Index;
- ULONG ShortIndex;
- HASHENTRY* entry;
-
- Index = pFCB->Hash.Hash % pVCB->HashTableSize;
- ShortIndex = pFCB->ShortHash.Hash % pVCB->HashTableSize;
-
- if (pFCB->Hash.Hash != pFCB->ShortHash.Hash)
- {
- entry = pVCB->FcbHashTable[ShortIndex];
- if (entry->self == pFCB)
- {
- pVCB->FcbHashTable[ShortIndex] = entry->next;
- }
- else
- {
- while (entry->next->self != pFCB)
- {
- entry = entry->next;
- }
- entry->next = pFCB->ShortHash.next;
- }
- }
- entry = pVCB->FcbHashTable[Index];
- if (entry->self == pFCB)
- {
- pVCB->FcbHashTable[Index] = entry->next;
- }
- else
- {
- while (entry->next->self != pFCB)
- {
- entry = entry->next;
- }
- entry->next = pFCB->Hash.next;
- }
-
- RemoveEntryList(&pFCB->FcbListEntry);
-}
-
-static
-NTSTATUS
-vfatMakeFullName(
- PVFATFCB directoryFCB,
- PUNICODE_STRING LongNameU,
- PUNICODE_STRING ShortNameU,
- PUNICODE_STRING NameU)
-{
- PWCHAR PathNameBuffer;
- USHORT PathNameLength;
-
- PathNameLength = directoryFCB->PathNameU.Length + max(LongNameU->Length, ShortNameU->Length);
- if (!vfatFCBIsRoot(directoryFCB))
- {
- PathNameLength += sizeof(WCHAR);
- }
-
- if (PathNameLength > LONGNAME_MAX_LENGTH * sizeof(WCHAR))
- {
- return STATUS_OBJECT_NAME_INVALID;
- }
- PathNameBuffer = ExAllocatePoolWithTag(NonPagedPool, PathNameLength + sizeof(WCHAR), TAG_FCB);
- if (!PathNameBuffer)
- {
- return STATUS_INSUFFICIENT_RESOURCES;
- }
- NameU->Buffer = PathNameBuffer;
- NameU->Length = 0;
- NameU->MaximumLength = PathNameLength;
-
- RtlCopyUnicodeString(NameU, &directoryFCB->PathNameU);
- if (!vfatFCBIsRoot(directoryFCB))
- {
- RtlAppendUnicodeToString(NameU, L"\\");
- }
- if (LongNameU->Length > 0)
- {
- RtlAppendUnicodeStringToString(NameU, LongNameU);
- }
- else
- {
- RtlAppendUnicodeStringToString(NameU, ShortNameU);
- }
- NameU->Buffer[NameU->Length / sizeof(WCHAR)] = 0;
-
- return STATUS_SUCCESS;
-}
-
-VOID
-vfatDestroyCCB(
- PVFATCCB pCcb)
-{
- if (pCcb->SearchPattern.Buffer)
- {
- ExFreePoolWithTag(pCcb->SearchPattern.Buffer, TAG_VFAT);
- }
- ExFreeToNPagedLookasideList(&VfatGlobalData->CcbLookasideList, pCcb);
-}
-
-VOID
-vfatDestroyFCB(
- PVFATFCB pFCB)
-{
- FsRtlUninitializeFileLock(&pFCB->FileLock);
- if (!vfatFCBIsRoot(pFCB) &&
- !BooleanFlagOn(pFCB->Flags, FCB_IS_FAT) && !BooleanFlagOn(pFCB->Flags, FCB_IS_VOLUME))
- {
- RemoveEntryList(&pFCB->ParentListEntry);
- }
- ExFreePool(pFCB->PathNameBuffer);
- ExDeleteResourceLite(&pFCB->PagingIoResource);
- ExDeleteResourceLite(&pFCB->MainResource);
- ASSERT(IsListEmpty(&pFCB->ParentListHead));
- ExFreeToNPagedLookasideList(&VfatGlobalData->FcbLookasideList, pFCB);
-}
-
-BOOLEAN
-vfatFCBIsRoot(
- PVFATFCB FCB)
-{
- return FCB->PathNameU.Length == sizeof(WCHAR) && FCB->PathNameU.Buffer[0] == L'\\' ? TRUE : FALSE;
-}
-
-VOID
-vfatGrabFCB(
- PDEVICE_EXTENSION pVCB,
- PVFATFCB pFCB)
-{
- ASSERT(ExIsResourceAcquiredExclusive(&pVCB->DirResource));
-
- ASSERT(pFCB != pVCB->VolumeFcb);
- ASSERT(pFCB->RefCount > 0);
- ++pFCB->RefCount;
-}
-
-VOID
-vfatReleaseFCB(
- PDEVICE_EXTENSION pVCB,
- PVFATFCB pFCB)
-{
- PVFATFCB tmpFcb;
-
- DPRINT("releasing FCB at %p: %wZ, refCount:%d\n",
- pFCB, &pFCB->PathNameU, pFCB->RefCount);
-
- ASSERT(ExIsResourceAcquiredExclusive(&pVCB->DirResource));
-
- while (pFCB)
- {
- ASSERT(pFCB != pVCB->VolumeFcb);
- ASSERT(pFCB->RefCount > 0);
- pFCB->RefCount--;
- if (pFCB->RefCount == 0)
- {
- ASSERT(pFCB->OpenHandleCount == 0);
- tmpFcb = pFCB->parentFcb;
- vfatDelFCBFromTable(pVCB, pFCB);
- vfatDestroyFCB(pFCB);
- }
- else
- {
- tmpFcb = NULL;
- }
- pFCB = tmpFcb;
- }
-}
-
-static
-VOID
-vfatAddFCBToTable(
- PDEVICE_EXTENSION pVCB,
- PVFATFCB pFCB)
-{
- ULONG Index;
- ULONG ShortIndex;
-
- ASSERT(pFCB->Hash.Hash == vfatNameHash(0, &pFCB->PathNameU));
- Index = pFCB->Hash.Hash % pVCB->HashTableSize;
- ShortIndex = pFCB->ShortHash.Hash % pVCB->HashTableSize;
-
- InsertTailList(&pVCB->FcbListHead, &pFCB->FcbListEntry);
-
- pFCB->Hash.next = pVCB->FcbHashTable[Index];
- pVCB->FcbHashTable[Index] = &pFCB->Hash;
- if (pFCB->Hash.Hash != pFCB->ShortHash.Hash)
- {
- pFCB->ShortHash.next = pVCB->FcbHashTable[ShortIndex];
- pVCB->FcbHashTable[ShortIndex] = &pFCB->ShortHash;
- }
- if (pFCB->parentFcb)
- {
- vfatGrabFCB(pVCB, pFCB->parentFcb);
- }
-}
-
-static
-VOID
-vfatInitFCBFromDirEntry(
- PDEVICE_EXTENSION Vcb,
- PVFATFCB Fcb,
- PVFAT_DIRENTRY_CONTEXT DirContext)
-{
- ULONG Size;
-
- RtlCopyMemory(&Fcb->entry, &DirContext->DirEntry, sizeof (DIR_ENTRY));
- RtlCopyUnicodeString(&Fcb->ShortNameU, &DirContext->ShortNameU);
- Fcb->Hash.Hash = vfatNameHash(0, &Fcb->PathNameU);
- if (vfatVolumeIsFatX(Vcb))
- {
- Fcb->ShortHash.Hash = Fcb->Hash.Hash;
- }
- else
- {
- Fcb->ShortHash.Hash = vfatNameHash(0, &Fcb->DirNameU);
- Fcb->ShortHash.Hash = vfatNameHash(Fcb->ShortHash.Hash, &Fcb->ShortNameU);
- }
-
- if (vfatFCBIsDirectory(Fcb))
- {
- ULONG FirstCluster, CurrentCluster;
- NTSTATUS Status = STATUS_SUCCESS;
- Size = 0;
- FirstCluster = vfatDirEntryGetFirstCluster(Vcb, &Fcb->entry);
- if (FirstCluster == 1)
- {
- Size = Vcb->FatInfo.rootDirectorySectors * Vcb->FatInfo.BytesPerSector;
- }
- else if (FirstCluster != 0)
- {
- CurrentCluster = FirstCluster;
- while (CurrentCluster != 0xffffffff && NT_SUCCESS(Status))
- {
- Size += Vcb->FatInfo.BytesPerCluster;
- Status = NextCluster(Vcb, FirstCluster, &CurrentCluster, FALSE);
- }
- }
- }
- else if (vfatVolumeIsFatX(Vcb))
- {
- Size = Fcb->entry.FatX.FileSize;
- }
- else
- {
- Size = Fcb->entry.Fat.FileSize;
- }
- Fcb->dirIndex = DirContext->DirIndex;
- Fcb->startIndex = DirContext->StartIndex;
- if (vfatVolumeIsFatX(Vcb) && !vfatFCBIsRoot(Fcb))
- {
- ASSERT(DirContext->DirIndex >= 2 && DirContext->StartIndex >= 2);
- Fcb->dirIndex = DirContext->DirIndex-2;
- Fcb->startIndex = DirContext->StartIndex-2;
- }
- Fcb->RFCB.FileSize.QuadPart = Size;
- Fcb->RFCB.ValidDataLength.QuadPart = Size;
- Fcb->RFCB.AllocationSize.QuadPart = ROUND_UP_64(Size, Vcb->FatInfo.BytesPerCluster);
-}
-
-NTSTATUS
-vfatSetFCBNewDirName(
- PDEVICE_EXTENSION pVCB,
- PVFATFCB Fcb,
- PVFATFCB ParentFcb)
-{
- NTSTATUS Status;
- UNICODE_STRING NewNameU;
-
- /* Get full path name */
- Status = vfatMakeFullName(ParentFcb, &Fcb->LongNameU, &Fcb->ShortNameU, &NewNameU);
- if (!NT_SUCCESS(Status))
- {
- return Status;
- }
-
- /* Delete old name */
- if (Fcb->PathNameBuffer)
- {
- ExFreePoolWithTag(Fcb->PathNameBuffer, TAG_FCB);
- }
- Fcb->PathNameU = NewNameU;
-
- /* Delete from table */
- vfatDelFCBFromTable(pVCB, Fcb);
-
- /* Split it properly */
- Fcb->PathNameBuffer = Fcb->PathNameU.Buffer;
- Fcb->DirNameU.Buffer = Fcb->PathNameU.Buffer;
- vfatSplitPathName(&Fcb->PathNameU, &Fcb->DirNameU, &Fcb->LongNameU);
- Fcb->Hash.Hash = vfatNameHash(0, &Fcb->PathNameU);
- if (vfatVolumeIsFatX(pVCB))
- {
- Fcb->ShortHash.Hash = Fcb->Hash.Hash;
- }
- else
- {
- Fcb->ShortHash.Hash = vfatNameHash(0, &Fcb->DirNameU);
- Fcb->ShortHash.Hash = vfatNameHash(Fcb->ShortHash.Hash, &Fcb->ShortNameU);
- }
-
- vfatAddFCBToTable(pVCB, Fcb);
- vfatReleaseFCB(pVCB, ParentFcb);
-
- return STATUS_SUCCESS;
-}
-
-NTSTATUS
-vfatUpdateFCB(
- PDEVICE_EXTENSION pVCB,
- PVFATFCB Fcb,
- PVFAT_DIRENTRY_CONTEXT DirContext,
- PVFATFCB ParentFcb)
-{
- NTSTATUS Status;
- PVFATFCB OldParent;
-
- DPRINT("vfatUpdateFCB(%p, %p, %p, %p)\n", pVCB, Fcb, DirContext, ParentFcb);
-
- /* Get full path name */
- Status = vfatMakeFullName(ParentFcb, &DirContext->LongNameU, &DirContext->ShortNameU, &Fcb->PathNameU);
- if (!NT_SUCCESS(Status))
- {
- return Status;
- }
-
- /* Delete old name */
- if (Fcb->PathNameBuffer)
- {
- ExFreePoolWithTag(Fcb->PathNameBuffer, TAG_FCB);
- }
-
- /* Delete from table */
- vfatDelFCBFromTable(pVCB, Fcb);
-
- /* Split it properly */
- Fcb->PathNameBuffer = Fcb->PathNameU.Buffer;
- Fcb->DirNameU.Buffer = Fcb->PathNameU.Buffer;
- vfatSplitPathName(&Fcb->PathNameU, &Fcb->DirNameU, &Fcb->LongNameU);
-
- /* Save old parent */
- OldParent = Fcb->parentFcb;
- RemoveEntryList(&Fcb->ParentListEntry);
-
- /* Reinit FCB */
- vfatInitFCBFromDirEntry(pVCB, Fcb, DirContext);
-
- if (vfatFCBIsDirectory(Fcb))
- {
- CcFlushCache(&Fcb->SectionObjectPointers, NULL, 0, NULL);
- }
- Fcb->parentFcb = ParentFcb;
- InsertTailList(&ParentFcb->ParentListHead, &Fcb->ParentListEntry);
- vfatAddFCBToTable(pVCB, Fcb);
-
- /* If we moved across directories, dereference our old parent
- * We also dereference in case we're just renaming since AddFCBToTable references it
- */
- vfatReleaseFCB(pVCB, OldParent);
-
- return STATUS_SUCCESS;
-}
-
-PVFATFCB
-vfatGrabFCBFromTable(
- PDEVICE_EXTENSION pVCB,
- PUNICODE_STRING PathNameU)
-{
- PVFATFCB rcFCB;
- ULONG Hash;
- UNICODE_STRING DirNameU;
- UNICODE_STRING FileNameU;
- PUNICODE_STRING FcbNameU;
-
- HASHENTRY* entry;
-
- DPRINT("'%wZ'\n", PathNameU);
-
- ASSERT(PathNameU->Length >= sizeof(WCHAR) && PathNameU->Buffer[0] == L'\\');
- Hash = vfatNameHash(0, PathNameU);
-
- entry = pVCB->FcbHashTable[Hash % pVCB->HashTableSize];
- if (entry)
- {
- vfatSplitPathName(PathNameU, &DirNameU, &FileNameU);
- }
-
- while (entry)
- {
- if (entry->Hash == Hash)
- {
- rcFCB = entry->self;
- DPRINT("'%wZ' '%wZ'\n", &DirNameU, &rcFCB->DirNameU);
- if (RtlEqualUnicodeString(&DirNameU, &rcFCB->DirNameU, TRUE))
- {
- if (rcFCB->Hash.Hash == Hash)
- {
- FcbNameU = &rcFCB->LongNameU;
- }
- else
- {
- FcbNameU = &rcFCB->ShortNameU;
- }
- /* compare the file name */
- DPRINT("'%wZ' '%wZ'\n", &FileNameU, FcbNameU);
- if (RtlEqualUnicodeString(&FileNameU, FcbNameU, TRUE))
- {
- vfatGrabFCB(pVCB, rcFCB);
- return rcFCB;
- }
- }
- }
- entry = entry->next;
- }
- return NULL;
-}
-
-static
-NTSTATUS
-vfatFCBInitializeCacheFromVolume(
- PVCB vcb,
- PVFATFCB fcb)
-{
- PFILE_OBJECT fileObject;
- PVFATCCB newCCB;
- NTSTATUS status;
-
- fileObject = IoCreateStreamFileObject (NULL, vcb->StorageDevice);
-
- newCCB = ExAllocateFromNPagedLookasideList(&VfatGlobalData->CcbLookasideList);
- if (newCCB == NULL)
- {
- ObDereferenceObject(fileObject);
- return STATUS_INSUFFICIENT_RESOURCES;
- }
- RtlZeroMemory(newCCB, sizeof (VFATCCB));
-
- fileObject->SectionObjectPointer = &fcb->SectionObjectPointers;
- fileObject->FsContext = fcb;
- fileObject->FsContext2 = newCCB;
- fcb->FileObject = fileObject;
-
- _SEH2_TRY
- {
- CcInitializeCacheMap(fileObject,
- (PCC_FILE_SIZES)(&fcb->RFCB.AllocationSize),
- TRUE,
- &VfatGlobalData->CacheMgrCallbacks,
- fcb);
- }
- _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
- {
- status = _SEH2_GetExceptionCode();
- fcb->FileObject = NULL;
- ExFreeToNPagedLookasideList(&VfatGlobalData->CcbLookasideList, newCCB);
- ObDereferenceObject(fileObject);
- return status;
- }
- _SEH2_END;
-
- vfatGrabFCB(vcb, fcb);
- fcb->Flags |= FCB_CACHE_INITIALIZED;
- return STATUS_SUCCESS;
-}
-
-PVFATFCB
-vfatMakeRootFCB(
- PDEVICE_EXTENSION pVCB)
-{
- PVFATFCB FCB;
- ULONG FirstCluster, CurrentCluster, Size = 0;
- NTSTATUS Status = STATUS_SUCCESS;
- UNICODE_STRING NameU = RTL_CONSTANT_STRING(L"\\");
-
- FCB = vfatNewFCB(pVCB, &NameU);
- if (vfatVolumeIsFatX(pVCB))
- {
- memset(FCB->entry.FatX.Filename, ' ', 42);
- FCB->entry.FatX.FileSize = pVCB->FatInfo.rootDirectorySectors * pVCB->FatInfo.BytesPerSector;
- FCB->entry.FatX.Attrib = FILE_ATTRIBUTE_DIRECTORY;
- FCB->entry.FatX.FirstCluster = 1;
- Size = pVCB->FatInfo.rootDirectorySectors * pVCB->FatInfo.BytesPerSector;
- }
- else
- {
- memset(FCB->entry.Fat.ShortName, ' ', 11);
- FCB->entry.Fat.FileSize = pVCB->FatInfo.rootDirectorySectors * pVCB->FatInfo.BytesPerSector;
- FCB->entry.Fat.Attrib = FILE_ATTRIBUTE_DIRECTORY;
- if (pVCB->FatInfo.FatType == FAT32)
- {
- CurrentCluster = FirstCluster = pVCB->FatInfo.RootCluster;
- FCB->entry.Fat.FirstCluster = (unsigned short)(FirstCluster & 0xffff);
- FCB->entry.Fat.FirstClusterHigh = (unsigned short)(FirstCluster >> 16);
-
- while (CurrentCluster != 0xffffffff && NT_SUCCESS(Status))
- {
- Size += pVCB->FatInfo.BytesPerCluster;
- Status = NextCluster (pVCB, FirstCluster, &CurrentCluster, FALSE);
- }
- }
- else
- {
- FCB->entry.Fat.FirstCluster = 1;
- Size = pVCB->FatInfo.rootDirectorySectors * pVCB->FatInfo.BytesPerSector;
- }
- }
- FCB->ShortHash.Hash = FCB->Hash.Hash;
- FCB->RefCount = 2;
- FCB->dirIndex = 0;
- FCB->RFCB.FileSize.QuadPart = Size;
- FCB->RFCB.ValidDataLength.QuadPart = Size;
- FCB->RFCB.AllocationSize.QuadPart = Size;
- FCB->RFCB.IsFastIoPossible = FastIoIsNotPossible;
-
- vfatFCBInitializeCacheFromVolume(pVCB, FCB);
- vfatAddFCBToTable(pVCB, FCB);
-
- return FCB;
-}
-
-PVFATFCB
-vfatOpenRootFCB(
- PDEVICE_EXTENSION pVCB)
-{
- PVFATFCB FCB;
- UNICODE_STRING NameU = RTL_CONSTANT_STRING(L"\\");
-
- FCB = vfatGrabFCBFromTable(pVCB, &NameU);
- if (FCB == NULL)
- {
- FCB = vfatMakeRootFCB(pVCB);
- }
-
- return FCB;
-}
-
-NTSTATUS
-vfatMakeFCBFromDirEntry(
- PVCB vcb,
- PVFATFCB directoryFCB,
- PVFAT_DIRENTRY_CONTEXT DirContext,
- PVFATFCB *fileFCB)
-{
- PVFATFCB rcFCB;
- UNICODE_STRING NameU;
- NTSTATUS Status;
-
- Status = vfatMakeFullName(directoryFCB, &DirContext->LongNameU, &DirContext->ShortNameU, &NameU);
- if (!NT_SUCCESS(Status))
- {
- return Status;
- }
-
- rcFCB = vfatNewFCB(vcb, &NameU);
- vfatInitFCBFromDirEntry(vcb, rcFCB, DirContext);
-
- rcFCB->RefCount = 1;
- if (vfatFCBIsDirectory(rcFCB))
- {
- Status = vfatFCBInitializeCacheFromVolume(vcb, rcFCB);
- if (!NT_SUCCESS(Status))
- {
- vfatReleaseFCB(vcb, rcFCB);
- ExFreePoolWithTag(NameU.Buffer, TAG_FCB);
- return Status;
- }
- }
- rcFCB->parentFcb = directoryFCB;
- InsertTailList(&directoryFCB->ParentListHead, &rcFCB->ParentListEntry);
- vfatAddFCBToTable(vcb, rcFCB);
- *fileFCB = rcFCB;
-
- ExFreePoolWithTag(NameU.Buffer, TAG_FCB);
- return STATUS_SUCCESS;
-}
-
-NTSTATUS
-vfatAttachFCBToFileObject(
- PDEVICE_EXTENSION vcb,
- PVFATFCB fcb,
- PFILE_OBJECT fileObject)
-{
- PVFATCCB newCCB;
-
- UNREFERENCED_PARAMETER(vcb);
-
- newCCB = ExAllocateFromNPagedLookasideList(&VfatGlobalData->CcbLookasideList);
- if (newCCB == NULL)
- {
- return STATUS_INSUFFICIENT_RESOURCES;
- }
- RtlZeroMemory(newCCB, sizeof (VFATCCB));
-
- fileObject->SectionObjectPointer = &fcb->SectionObjectPointers;
- fileObject->FsContext = fcb;
- fileObject->FsContext2 = newCCB;
- DPRINT("file open: fcb:%p PathName:%wZ\n", fcb, &fcb->PathNameU);
-
- return STATUS_SUCCESS;
-}
-
-NTSTATUS
-vfatDirFindFile(
- PDEVICE_EXTENSION pDeviceExt,
- PVFATFCB pDirectoryFCB,
- PUNICODE_STRING FileToFindU,
- PVFATFCB *pFoundFCB)
-{
- NTSTATUS status;
- PVOID Context = NULL;
- PVOID Page = NULL;
- BOOLEAN First = TRUE;
- VFAT_DIRENTRY_CONTEXT DirContext;
- /* This buffer must have a size of 260 characters, because
- vfatMakeFCBFromDirEntry can copy 20 name entries with 13 characters. */
- WCHAR LongNameBuffer[260];
- WCHAR ShortNameBuffer[13];
- BOOLEAN FoundLong = FALSE;
- BOOLEAN FoundShort = FALSE;
- BOOLEAN IsFatX = vfatVolumeIsFatX(pDeviceExt);
-
- ASSERT(pDeviceExt);
- ASSERT(pDirectoryFCB);
- ASSERT(FileToFindU);
-
- DPRINT("vfatDirFindFile(VCB:%p, dirFCB:%p, File:%wZ)\n",
- pDeviceExt, pDirectoryFCB, FileToFindU);
- DPRINT("Dir Path:%wZ\n", &pDirectoryFCB->PathNameU);
-
- DirContext.DirIndex = 0;
- DirContext.LongNameU.Buffer = LongNameBuffer;
- DirContext.LongNameU.Length = 0;
- DirContext.LongNameU.MaximumLength = sizeof(LongNameBuffer);
- DirContext.ShortNameU.Buffer = ShortNameBuffer;
- DirContext.ShortNameU.Length = 0;
- DirContext.ShortNameU.MaximumLength = sizeof(ShortNameBuffer);
-
- while (TRUE)
- {
- status = VfatGetNextDirEntry(pDeviceExt,
- &Context,
- &Page,
- pDirectoryFCB,
- &DirContext,
- First);
- First = FALSE;
- if (status == STATUS_NO_MORE_ENTRIES)
- {
- return STATUS_OBJECT_NAME_NOT_FOUND;
- }
- if (!NT_SUCCESS(status))
- {
- return status;
- }
-
- DPRINT(" Index:%u longName:%wZ\n",
- DirContext.DirIndex, &DirContext.LongNameU);
-
- if (!ENTRY_VOLUME(IsFatX, &DirContext.DirEntry))
- {
- if (DirContext.LongNameU.Length == 0 ||
- DirContext.ShortNameU.Length == 0)
- {
- DPRINT1("WARNING: File system corruption detected. You may need to run a disk repair utility.\n");
- if (VfatGlobalData->Flags & VFAT_BREAK_ON_CORRUPTION)
- {
- ASSERT(DirContext.LongNameU.Length != 0 &&
- DirContext.ShortNameU.Length != 0);
- }
- DirContext.DirIndex++;
- continue;
- }
- FoundLong = RtlEqualUnicodeString(FileToFindU, &DirContext.LongNameU, TRUE);
- if (FoundLong == FALSE)
- {
- FoundShort = RtlEqualUnicodeString(FileToFindU, &DirContext.ShortNameU, TRUE);
- }
- if (FoundLong || FoundShort)
- {
- status = vfatMakeFCBFromDirEntry(pDeviceExt,
- pDirectoryFCB,
- &DirContext,
- pFoundFCB);
- CcUnpinData(Context);
- return status;
- }
- }
- DirContext.DirIndex++;
- }
-
- return STATUS_OBJECT_NAME_NOT_FOUND;
-}
-
-NTSTATUS
-vfatGetFCBForFile(
- PDEVICE_EXTENSION pVCB,
- PVFATFCB *pParentFCB,
- PVFATFCB *pFCB,
- PUNICODE_STRING pFileNameU)
-{
- NTSTATUS status;
- PVFATFCB FCB = NULL;
- PVFATFCB parentFCB;
- UNICODE_STRING NameU;
- UNICODE_STRING RootNameU = RTL_CONSTANT_STRING(L"\\");
- UNICODE_STRING FileNameU;
- WCHAR NameBuffer[260];
- PWCHAR curr, prev, last;
- ULONG Length;
-
- DPRINT("vfatGetFCBForFile (%p,%p,%p,%wZ)\n",
- pVCB, pParentFCB, pFCB, pFileNameU);
-
- RtlInitEmptyUnicodeString(&FileNameU, NameBuffer, sizeof(NameBuffer));
-
- parentFCB = *pParentFCB;
-
- if (parentFCB == NULL)
- {
- /* Passed-in name is the full name */
- RtlCopyUnicodeString(&FileNameU, pFileNameU);
-
- // Trivial case, open of the root directory on volume
- if (RtlEqualUnicodeString(&FileNameU, &RootNameU, FALSE))
- {
- DPRINT("returning root FCB\n");
-
- FCB = vfatOpenRootFCB(pVCB);
- *pFCB = FCB;
- *pParentFCB = NULL;
-
- return (FCB != NULL) ? STATUS_SUCCESS : STATUS_OBJECT_PATH_NOT_FOUND;
- }
-
- /* Check for an existing FCB */
- FCB = vfatGrabFCBFromTable(pVCB, &FileNameU);
- if (FCB)
- {
- *pFCB = FCB;
- *pParentFCB = FCB->parentFcb;
- vfatGrabFCB(pVCB, *pParentFCB);
- return STATUS_SUCCESS;
- }
-
- last = curr = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
- while (*curr != L'\\' && curr > FileNameU.Buffer)
- {
- curr--;
- }
-
- if (curr > FileNameU.Buffer)
- {
- NameU.Buffer = FileNameU.Buffer;
- NameU.MaximumLength = NameU.Length = (curr - FileNameU.Buffer) * sizeof(WCHAR);
- FCB = vfatGrabFCBFromTable(pVCB, &NameU);
- if (FCB)
- {
- Length = (curr - FileNameU.Buffer) * sizeof(WCHAR);
- if (Length != FCB->PathNameU.Length)
- {
- if (FileNameU.Length + FCB->PathNameU.Length - Length > FileNameU.MaximumLength)
- {
- vfatReleaseFCB(pVCB, FCB);
- return STATUS_OBJECT_NAME_INVALID;
- }
- RtlMoveMemory(FileNameU.Buffer + FCB->PathNameU.Length / sizeof(WCHAR),
- curr, FileNameU.Length - Length);
- FileNameU.Length += (USHORT)(FCB->PathNameU.Length - Length);
- curr = FileNameU.Buffer + FCB->PathNameU.Length / sizeof(WCHAR);
- last = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
- }
- RtlCopyMemory(FileNameU.Buffer, FCB->PathNameU.Buffer, FCB->PathNameU.Length);
- }
- }
- else
- {
- FCB = NULL;
- }
-
- if (FCB == NULL)
- {
- FCB = vfatOpenRootFCB(pVCB);
- curr = FileNameU.Buffer;
- }
-
- parentFCB = NULL;
- prev = curr;
- }
- else
- {
- /* Make absolute path */
- RtlCopyUnicodeString(&FileNameU, &parentFCB->PathNameU);
- curr = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
- if (*curr != L'\\')
- {
- RtlAppendUnicodeToString(&FileNameU, L"\\");
- curr++;
- }
- ASSERT(*curr == L'\\');
- RtlAppendUnicodeStringToString(&FileNameU, pFileNameU);
-
- FCB = parentFCB;
- parentFCB = NULL;
- prev = curr;
- last = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
- }
-
- while (curr <= last)
- {
- if (parentFCB)
- {
- vfatReleaseFCB(pVCB, parentFCB);
- parentFCB = NULL;
- }
- // fail if element in FCB is not a directory
- if (!vfatFCBIsDirectory(FCB))
- {
- DPRINT ("Element in requested path is not a directory\n");
-
- vfatReleaseFCB(pVCB, FCB);
- FCB = NULL;
- *pParentFCB = NULL;
- *pFCB = NULL;
-
- return STATUS_OBJECT_PATH_NOT_FOUND;
- }
- parentFCB = FCB;
- if (prev < curr)
- {
- Length = (curr - prev) * sizeof(WCHAR);
- if (Length != parentFCB->LongNameU.Length)
- {
- if (FileNameU.Length + parentFCB->LongNameU.Length - Length > FileNameU.MaximumLength)
- {
- vfatReleaseFCB(pVCB, parentFCB);
- *pParentFCB = NULL;
- *pFCB = NULL;
- return STATUS_OBJECT_NAME_INVALID;
- }
- RtlMoveMemory(prev + parentFCB->LongNameU.Length / sizeof(WCHAR), curr,
- FileNameU.Length - (curr - FileNameU.Buffer) * sizeof(WCHAR));
- FileNameU.Length += (USHORT)(parentFCB->LongNameU.Length - Length);
- curr = prev + parentFCB->LongNameU.Length / sizeof(WCHAR);
- last = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
- }
- RtlCopyMemory(prev, parentFCB->LongNameU.Buffer, parentFCB->LongNameU.Length);
- }
- curr++;
- prev = curr;
- while (*curr != L'\\' && curr <= last)
- {
- curr++;
- }
- NameU.Buffer = FileNameU.Buffer;
- NameU.Length = (curr - NameU.Buffer) * sizeof(WCHAR);
- NameU.MaximumLength = FileNameU.MaximumLength;
- DPRINT("%wZ\n", &NameU);
- FCB = vfatGrabFCBFromTable(pVCB, &NameU);
- if (FCB == NULL)
- {
- NameU.Buffer = prev;
- NameU.MaximumLength = NameU.Length = (curr - prev) * sizeof(WCHAR);
- status = vfatDirFindFile(pVCB, parentFCB, &NameU, &FCB);
- if (status == STATUS_OBJECT_NAME_NOT_FOUND)
- {
- *pFCB = NULL;
- if (curr > last)
- {
- *pParentFCB = parentFCB;
- return STATUS_OBJECT_NAME_NOT_FOUND;
- }
- else
- {
- vfatReleaseFCB(pVCB, parentFCB);
- *pParentFCB = NULL;
- return STATUS_OBJECT_PATH_NOT_FOUND;
- }
- }
- else if (!NT_SUCCESS(status))
- {
- vfatReleaseFCB(pVCB, parentFCB);
- *pParentFCB = NULL;
- *pFCB = NULL;
-
- return status;
- }
- }
- }
-
- *pParentFCB = parentFCB;
- *pFCB = FCB;
-
- return STATUS_SUCCESS;
-}
projects / reactos.git / blobdiff