/*
-* FILE: drivers/fs/vfat/fcb.c
+* 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 */
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)
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);
ExFreeToNPagedLookasideList(&VfatGlobalData->FcbLookasideList, pFCB);
+ ASSERT(IsListEmpty(&pFCB->ParentListHead));
}
BOOLEAN
vfatFCBIsDirectory(
PVFATFCB FCB)
{
- return *FCB->Attributes & FILE_ATTRIBUTE_DIRECTORY;
+ return ((*FCB->Attributes & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY);
}
BOOLEAN
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)
{
- HASHENTRY* entry;
- ULONG Index;
- ULONG ShortIndex;
PVFATFCB tmpFcb;
DPRINT("releasing FCB at %p: %wZ, refCount:%d\n",
pFCB, &pFCB->PathNameU, pFCB->RefCount);
+ ASSERT(ExIsResourceAcquiredExclusive(&pVCB->DirResource));
+
while (pFCB)
{
- Index = pFCB->Hash.Hash % pVCB->HashTableSize;
- ShortIndex = pFCB->ShortHash.Hash % pVCB->HashTableSize;
+ ASSERT(pFCB != pVCB->VolumeFcb);
+ ASSERT(pFCB->RefCount > 0);
pFCB->RefCount--;
if (pFCB->RefCount == 0)
{
+ ASSERT(pFCB->OpenHandleCount == 0);
tmpFcb = pFCB->parentFcb;
- RemoveEntryList (&pFCB->FcbListEntry);
- 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;
- }
+ vfatDelFCBFromTable(pVCB, pFCB);
vfatDestroyFCB(pFCB);
}
else
}
}
+static
VOID
vfatAddFCBToTable(
PDEVICE_EXTENSION pVCB,
}
if (pFCB->parentFcb)
{
- pFCB->parentFcb->RefCount++;
+ 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);
+ if (Vcb->Flags & VCB_IS_FATX)
+ {
+ 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 (Fcb->Flags & FCB_IS_FATX_ENTRY)
+ {
+ Size = Fcb->entry.FatX.FileSize;
}
+ else
+ {
+ Size = Fcb->entry.Fat.FileSize;
+ }
+ Fcb->dirIndex = DirContext->DirIndex;
+ Fcb->startIndex = DirContext->StartIndex;
+ if ((Fcb->Flags & FCB_IS_FATX_ENTRY) && !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
+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
DPRINT("'%wZ'\n", PathNameU);
+ ASSERT(PathNameU->Length >= sizeof(WCHAR) && PathNameU->Buffer[0] == L'\\');
Hash = vfatNameHash(0, PathNameU);
entry = pVCB->FcbHashTable[Hash % pVCB->HashTableSize];
DPRINT("'%wZ' '%wZ'\n", &FileNameU, FcbNameU);
if (RtlEqualUnicodeString(&FileNameU, FcbNameU, TRUE))
{
- rcFCB->RefCount++;
+ vfatGrabFCB(pVCB, rcFCB);
return rcFCB;
}
}
{
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->FsContext = fcb;
fileObject->FsContext2 = newCCB;
fcb->FileObject = fileObject;
- fcb->RefCount++;
- CcInitializeCacheMap(fileObject,
- (PCC_FILE_SIZES)(&fcb->RFCB.AllocationSize),
- TRUE,
- &VfatGlobalData->CacheMgrCallbacks,
- fcb);
+ _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 *fileFCB)
{
PVFATFCB rcFCB;
- PWCHAR PathNameBuffer;
- USHORT PathNameLength;
- ULONG Size;
- ULONG hash;
-
UNICODE_STRING NameU;
+ NTSTATUS Status;
- PathNameLength = directoryFCB->PathNameU.Length + max(DirContext->LongNameU.Length, DirContext->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)
+ Status = vfatMakeFullName(directoryFCB, &DirContext->LongNameU, &DirContext->ShortNameU, &NameU);
+ if (!NT_SUCCESS(Status))
{
- return STATUS_INSUFFICIENT_RESOURCES;
+ return Status;
}
- NameU.Buffer = PathNameBuffer;
- NameU.Length = 0;
- NameU.MaximumLength = PathNameLength;
-
- RtlCopyUnicodeString(&NameU, &directoryFCB->PathNameU);
- if (!vfatFCBIsRoot(directoryFCB))
- {
- RtlAppendUnicodeToString(&NameU, L"\\");
- }
- hash = vfatNameHash(0, &NameU);
- if (DirContext->LongNameU.Length > 0)
- {
- RtlAppendUnicodeStringToString(&NameU, &DirContext->LongNameU);
- }
- else
- {
- RtlAppendUnicodeStringToString(&NameU, &DirContext->ShortNameU);
- }
- NameU.Buffer[NameU.Length / sizeof(WCHAR)] = 0;
rcFCB = vfatNewFCB(vcb, &NameU);
- RtlCopyMemory(&rcFCB->entry, &DirContext->DirEntry, sizeof (DIR_ENTRY));
- RtlCopyUnicodeString(&rcFCB->ShortNameU, &DirContext->ShortNameU);
- if (vcb->Flags & VCB_IS_FATX)
- {
- rcFCB->ShortHash.Hash = rcFCB->Hash.Hash;
- }
- else
- {
- rcFCB->ShortHash.Hash = vfatNameHash(hash, &rcFCB->ShortNameU);
- }
+ vfatInitFCBFromDirEntry(vcb, rcFCB, DirContext);
- if (vfatFCBIsDirectory(rcFCB))
- {
- ULONG FirstCluster, CurrentCluster;
- NTSTATUS Status = STATUS_SUCCESS;
- Size = 0;
- FirstCluster = vfatDirEntryGetFirstCluster(vcb, &rcFCB->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 (rcFCB->Flags & FCB_IS_FATX_ENTRY)
- {
- Size = rcFCB->entry.FatX.FileSize;
- }
- else
- {
- Size = rcFCB->entry.Fat.FileSize;
- }
- rcFCB->dirIndex = DirContext->DirIndex;
- rcFCB->startIndex = DirContext->StartIndex;
- if ((rcFCB->Flags & FCB_IS_FATX_ENTRY) && !vfatFCBIsRoot(directoryFCB))
- {
- ASSERT(DirContext->DirIndex >= 2 && DirContext->StartIndex >= 2);
- rcFCB->dirIndex = DirContext->DirIndex-2;
- rcFCB->startIndex = DirContext->StartIndex-2;
- }
- rcFCB->RFCB.FileSize.QuadPart = Size;
- rcFCB->RFCB.ValidDataLength.QuadPart = Size;
- rcFCB->RFCB.AllocationSize.QuadPart = ROUND_UP(Size, vcb->FatInfo.BytesPerCluster);
- rcFCB->RefCount++;
+ rcFCB->RefCount = 1;
if (vfatFCBIsDirectory(rcFCB))
{
vfatFCBInitializeCacheFromVolume(vcb, rcFCB);
}
rcFCB->parentFcb = directoryFCB;
+ InsertTailList(&directoryFCB->ParentListHead, &rcFCB->ParentListEntry);
vfatAddFCBToTable(vcb, rcFCB);
*fileFCB = rcFCB;
- ExFreePool(PathNameBuffer);
+ ExFreePool(NameU.Buffer);
return STATUS_SUCCESS;
}
if (!ENTRY_VOLUME(pDeviceExt, &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)
{
DPRINT("vfatGetFCBForFile (%p,%p,%p,%wZ)\n",
pVCB, pParentFCB, pFCB, pFileNameU);
- FileNameU.Buffer = NameBuffer;
- FileNameU.MaximumLength = sizeof(NameBuffer);
- RtlCopyUnicodeString(&FileNameU, 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))
{
{
*pFCB = FCB;
*pParentFCB = FCB->parentFcb;
- (*pParentFCB)->RefCount++;
+ vfatGrabFCB(pVCB, *pParentFCB);
return STATUS_SUCCESS;
}
}
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 = FileNameU.Buffer - 1;
+ prev = curr;
last = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
}
if (parentFCB)
{
vfatReleaseFCB(pVCB, parentFCB);
- parentFCB = 0;
+ parentFCB = NULL;
}
// fail if element in FCB is not a directory
if (!vfatFCBIsDirectory(FCB))
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,
return STATUS_SUCCESS;
}
-
projects / reactos.git / blobdiff