VOID DokanCompleteCleanup(__in PIRP_ENTRY IrpEntry,
__in PEVENT_INFORMATION EventInfo) {
PIRP irp;
PIO_STACK_LOCATION irpSp;
NTSTATUS status = STATUS_SUCCESS;
PDokanCCB ccb;
PDokanFCB fcb;
PDokanVCB vcb;
PFILE_OBJECT fileObject;
DDbgPrint("==> DokanCompleteCleanup\n");
irp = IrpEntry->Irp;
irpSp = IrpEntry->IrpSp;
fileObject = IrpEntry->FileObject;
ASSERT(fileObject != NULL);
ccb = fileObject->FsContext2;
ASSERT(ccb != NULL);
ccb->UserContext = EventInfo->Context;
// DDbgPrint(" set Context %X\n", (ULONG)ccb->UserContext);
fcb = ccb->Fcb;
ASSERT(fcb != NULL);
vcb = fcb->Vcb;
status = EventInfo->Status;
DokanFCBLockRO(fcb);
if (DokanFCBFlagsIsSet(fcb, DOKAN_DELETE_ON_CLOSE)) {
if (DokanFCBFlagsIsSet(fcb, DOKAN_FILE_DIRECTORY)) {
DokanNotifyReportChange(fcb, FILE_NOTIFY_CHANGE_DIR_NAME,
FILE_ACTION_REMOVED);
} else {
DokanNotifyReportChange(fcb, FILE_NOTIFY_CHANGE_FILE_NAME,
FILE_ACTION_REMOVED);
}
}
DokanFCBUnlock(fcb);
//
// Unlock all outstanding file locks.
//
(VOID) FsRtlFastUnlockAll(&fcb->FileLock, fileObject,
IoGetRequestorProcess(irp), NULL);
if (DokanFCBFlagsIsSet(fcb, DOKAN_FILE_DIRECTORY)) {
FsRtlNotifyCleanup(vcb->NotifySync, &vcb->DirNotifyList, ccb);
}
IoRemoveShareAccess(irpSp->FileObject, &fcb->ShareAccess);
DokanCompleteIrpRequest(irp, status, 0);
DDbgPrint("<== DokanCompleteCleanup\n");
}
NTSTATUS
DokanNotifyChangeDirectory(__in PDEVICE_OBJECT DeviceObject, __in PIRP Irp) {
PDokanCCB ccb;
PDokanFCB fcb;
PFILE_OBJECT fileObject;
PIO_STACK_LOCATION irpSp;
PDokanVCB vcb;
DDbgPrint("\tNotifyChangeDirectory\n");
irpSp = IoGetCurrentIrpStackLocation(Irp);
fileObject = irpSp->FileObject;
vcb = DeviceObject->DeviceExtension;
if (GetIdentifierType(vcb) != VCB) {
return STATUS_INVALID_PARAMETER;
}
ccb = fileObject->FsContext2;
ASSERT(ccb != NULL);
fcb = ccb->Fcb;
ASSERT(fcb != NULL);
DokanFCBLockRO(fcb);
if (!(fcb->Flags & DOKAN_FILE_DIRECTORY)) {
DokanFCBUnlock(fcb);
return STATUS_INVALID_PARAMETER;
}
FsRtlNotifyFullChangeDirectory(
vcb->NotifySync, &vcb->DirNotifyList, ccb, (PSTRING)&fcb->FileName,
irpSp->Flags & SL_WATCH_TREE ? TRUE : FALSE, FALSE,
irpSp->Parameters.NotifyDirectory.CompletionFilter, Irp, NULL, NULL);
DokanFCBUnlock(fcb);
return STATUS_PENDING;
}
NTSTATUS
DokanDispatchWrite(__in PDEVICE_OBJECT DeviceObject, __in PIRP Irp) {
PIO_STACK_LOCATION irpSp;
PFILE_OBJECT fileObject;
NTSTATUS status = STATUS_INVALID_PARAMETER;
PEVENT_CONTEXT eventContext;
ULONG eventLength;
PDokanCCB ccb;
PDokanFCB fcb = NULL;
PDokanVCB vcb;
PVOID buffer;
BOOLEAN writeToEoF = FALSE;
BOOLEAN isPagingIo = FALSE;
BOOLEAN isNonCached = FALSE;
BOOLEAN isSynchronousIo = FALSE;
BOOLEAN fcbLocked = FALSE;
__try {
DDbgPrint("==> DokanWrite\n");
irpSp = IoGetCurrentIrpStackLocation(Irp);
fileObject = irpSp->FileObject;
//
// If this is a zero length write then return SUCCESS immediately.
//
if (irpSp->Parameters.Write.Length == 0) {
DDbgPrint(" Parameters.Write.Length == 0\n");
Irp->IoStatus.Information = 0;
status = STATUS_SUCCESS;
__leave;
}
if (fileObject == NULL) {
DDbgPrint(" fileObject == NULL\n");
status = STATUS_INVALID_DEVICE_REQUEST;
__leave;
}
vcb = DeviceObject->DeviceExtension;
if (GetIdentifierType(vcb) != VCB ||
!DokanCheckCCB(vcb->Dcb, fileObject->FsContext2)) {
status = STATUS_INVALID_PARAMETER;
__leave;
}
DDbgPrint(" ProcessId %lu\n", IoGetRequestorProcessId(Irp));
DokanPrintFileName(fileObject);
ccb = fileObject->FsContext2;
ASSERT(ccb != NULL);
fcb = ccb->Fcb;
ASSERT(fcb != NULL);
if (DokanFCBFlagsIsSet(fcb, DOKAN_FILE_DIRECTORY)) {
status = STATUS_INVALID_PARAMETER;
__leave;
}
if (Irp->MdlAddress) {
DDbgPrint(" use MdlAddress\n");
buffer = MmGetSystemAddressForMdlNormalSafe(Irp->MdlAddress);
} else {
DDbgPrint(" use UserBuffer\n");
buffer = Irp->UserBuffer;
}
if (buffer == NULL) {
DDbgPrint(" buffer == NULL\n");
status = STATUS_INVALID_PARAMETER;
__leave;
}
if (irpSp->Parameters.Write.ByteOffset.LowPart ==
FILE_WRITE_TO_END_OF_FILE &&
irpSp->Parameters.Write.ByteOffset.HighPart == -1) {
writeToEoF = TRUE;
}
if (Irp->Flags & IRP_PAGING_IO) {
isPagingIo = TRUE;
}
if (Irp->Flags & IRP_NOCACHE) {
isNonCached = TRUE;
}
if (fileObject->Flags & FO_SYNCHRONOUS_IO) {
isSynchronousIo = TRUE;
}
if (!isPagingIo && (fileObject->SectionObjectPointer != NULL) &&
(fileObject->SectionObjectPointer->DataSectionObject != NULL)) {
ExAcquireResourceExclusiveLite(&fcb->PagingIoResource, TRUE);
CcFlushCache(&fcb->SectionObjectPointers,
writeToEoF ? NULL : &irpSp->Parameters.Write.ByteOffset,
irpSp->Parameters.Write.Length, NULL);
CcPurgeCacheSection(&fcb->SectionObjectPointers,
writeToEoF ? NULL
: &irpSp->Parameters.Write.ByteOffset,
irpSp->Parameters.Write.Length, FALSE);
ExReleaseResourceLite(&fcb->PagingIoResource);
}
// Cannot write at end of the file when using paging IO
if (writeToEoF && isPagingIo) {
DDbgPrint(" writeToEoF & isPagingIo\n");
Irp->IoStatus.Information = 0;
status = STATUS_SUCCESS;
__leave;
}
// the length of EventContext is sum of length to write and length of file
// name
DokanFCBLockRO(fcb);
fcbLocked = TRUE;
eventLength = sizeof(EVENT_CONTEXT) + irpSp->Parameters.Write.Length +
fcb->FileName.Length;
eventContext = AllocateEventContext(vcb->Dcb, Irp, eventLength, ccb);
// no more memory!
if (eventContext == NULL) {
status = STATUS_INSUFFICIENT_RESOURCES;
__leave;
}
eventContext->Context = ccb->UserContext;
// DDbgPrint(" get Context %X\n", (ULONG)ccb->UserContext);
// When the length is bigger than usual event notitfication buffer,
// saves pointer in DiverContext to copy EventContext after allocating
// more bigger memory.
Irp->Tail.Overlay.DriverContext[DRIVER_CONTEXT_EVENT] = eventContext;
if (isPagingIo) {
DDbgPrint(" Paging IO\n");
eventContext->FileFlags |= DOKAN_PAGING_IO;
}
if (isSynchronousIo) {
DDbgPrint(" Synchronous IO\n");
eventContext->FileFlags |= DOKAN_SYNCHRONOUS_IO;
}
if (isNonCached) {
DDbgPrint(" Nocache\n");
eventContext->FileFlags |= DOKAN_NOCACHE;
}
// offset of file to write
eventContext->Operation.Write.ByteOffset =
irpSp->Parameters.Write.ByteOffset;
if (writeToEoF) {
eventContext->FileFlags |= DOKAN_WRITE_TO_END_OF_FILE;
DDbgPrint(" WriteOffset = end of file\n");
}
if (isSynchronousIo &&
((irpSp->Parameters.Write.ByteOffset.LowPart ==
FILE_USE_FILE_POINTER_POSITION) &&
(irpSp->Parameters.Write.ByteOffset.HighPart == -1))) {
// NOTE:
// http://msdn.microsoft.com/en-us/library/ms795960.aspx
// Do not check IrpSp->Parameters.Write.ByteOffset.QuadPart == 0
// Probably the document is wrong.
eventContext->Operation.Write.ByteOffset.QuadPart =
fileObject->CurrentByteOffset.QuadPart;
}
// the size of buffer to write
eventContext->Operation.Write.BufferLength = irpSp->Parameters.Write.Length;
// the offset from the begining of structure
// the contents to write will be copyed to this offset
eventContext->Operation.Write.BufferOffset =
FIELD_OFFSET(EVENT_CONTEXT, Operation.Write.FileName[0]) +
fcb->FileName.Length + sizeof(WCHAR); // adds last null char
// copies the content to write to EventContext
RtlCopyMemory((PCHAR)eventContext +
eventContext->Operation.Write.BufferOffset,
buffer, irpSp->Parameters.Write.Length);
// copies file name
eventContext->Operation.Write.FileNameLength = fcb->FileName.Length;
RtlCopyMemory(eventContext->Operation.Write.FileName, fcb->FileName.Buffer,
fcb->FileName.Length);
// When eventlength is less than event notification buffer,
// returns it to user-mode using pending event.
if (eventLength <= EVENT_CONTEXT_MAX_SIZE) {
DDbgPrint(" Offset %d:%d, Length %d\n",
irpSp->Parameters.Write.ByteOffset.HighPart,
irpSp->Parameters.Write.ByteOffset.LowPart,
irpSp->Parameters.Write.Length);
// EventContext is no longer needed, clear it
Irp->Tail.Overlay.DriverContext[DRIVER_CONTEXT_EVENT] = 0;
//
// We now check whether we can proceed based on the state of
// the file oplocks.
//
// FsRtlCheckOpLock is called with non-NULL completion routine - not blocking.
if (!FlagOn(Irp->Flags, IRP_PAGING_IO)) {
status = FsRtlCheckOplock(DokanGetFcbOplock(fcb), Irp, eventContext,
DokanOplockComplete, DokanPrePostIrp);
//
// if FsRtlCheckOplock returns STATUS_PENDING the IRP has been posted
// to service an oplock break and we need to leave now.
//
if (status != STATUS_SUCCESS) {
if (status == STATUS_PENDING) {
DDbgPrint(" FsRtlCheckOplock returned STATUS_PENDING\n");
} else {
DokanFreeEventContext(eventContext);
}
__leave;
}
}
// register this IRP to IRP waiting list and make it pending status
status = DokanRegisterPendingIrp(DeviceObject, Irp, eventContext, 0);
// Resuests bigger memory
// eventContext will be freed later using
// Irp->Tail.Overlay.DriverContext[DRIVER_CONTEXT_EVENT]
} else {
// the length at lest file name can be stored
ULONG requestContextLength = max(
sizeof(EVENT_CONTEXT), eventContext->Operation.Write.BufferOffset);
PEVENT_CONTEXT requestContext =
AllocateEventContext(vcb->Dcb, Irp, requestContextLength, ccb);
// no more memory!
if (requestContext == NULL) {
status = STATUS_INSUFFICIENT_RESOURCES;
Irp->Tail.Overlay.DriverContext[DRIVER_CONTEXT_EVENT] = 0;
DokanFreeEventContext(eventContext);
__leave;
}
DDbgPrint(" Offset %d:%d, Length %d (request)\n",
irpSp->Parameters.Write.ByteOffset.HighPart,
irpSp->Parameters.Write.ByteOffset.LowPart,
irpSp->Parameters.Write.Length);
// copies from begining of EventContext to the end of file name
RtlCopyMemory(requestContext, eventContext,
eventContext->Operation.Write.BufferOffset);
// puts actual size of RequestContext
requestContext->Length = requestContextLength;
// requsts enough size to copy EventContext
requestContext->Operation.Write.RequestLength = eventLength;
//
// We now check whether we can proceed based on the state of
// the file oplocks.
//
// FsRtlCheckOpLock is called with non-NULL completion routine - not blocking.
if (!FlagOn(Irp->Flags, IRP_PAGING_IO)) {
status = FsRtlCheckOplock(DokanGetFcbOplock(fcb), Irp, requestContext,
DokanOplockComplete, DokanPrePostIrp);
//
// if FsRtlCheckOplock returns STATUS_PENDING the IRP has been posted
// to service an oplock break and we need to leave now.
//
if (status != STATUS_SUCCESS) {
if (status == STATUS_PENDING) {
DDbgPrint(" FsRtlCheckOplock returned STATUS_PENDING\n");
} else {
DokanFreeEventContext(requestContext);
Irp->Tail.Overlay.DriverContext[DRIVER_CONTEXT_EVENT] = 0;
DokanFreeEventContext(eventContext);
}
__leave;
}
}
// regiters this IRP to IRP wainting list and make it pending status
status = DokanRegisterPendingIrp(DeviceObject, Irp, requestContext, 0);
}
} __finally {
if(fcbLocked)
DokanFCBUnlock(fcb);
DokanCompleteIrpRequest(Irp, status, 0);
DDbgPrint("<== DokanWrite\n");
}
return status;
}
VOID DokanCompleteSetInformation(__in PIRP_ENTRY IrpEntry,
__in PEVENT_INFORMATION EventInfo) {
PIRP irp;
PIO_STACK_LOCATION irpSp;
NTSTATUS status;
ULONG info = 0;
PDokanCCB ccb;
PDokanFCB fcb = NULL;
UNICODE_STRING oldFileName;
FILE_INFORMATION_CLASS infoClass;
irp = IrpEntry->Irp;
status = EventInfo->Status;
__try {
DDbgPrint("==> DokanCompleteSetInformation\n");
irpSp = IrpEntry->IrpSp;
ccb = IrpEntry->FileObject->FsContext2;
ASSERT(ccb != NULL);
KeEnterCriticalRegion();
ExAcquireResourceExclusiveLite(&ccb->Resource, TRUE);
fcb = ccb->Fcb;
ASSERT(fcb != NULL);
DokanFCBLockRW(fcb);
ccb->UserContext = EventInfo->Context;
info = EventInfo->BufferLength;
infoClass = irpSp->Parameters.SetFile.FileInformationClass;
RtlZeroMemory(&oldFileName, sizeof(UNICODE_STRING));
if (NT_SUCCESS(status)) {
if (infoClass == FileDispositionInformation) {
if (EventInfo->Operation.Delete.DeleteOnClose) {
if (!MmFlushImageSection(&fcb->SectionObjectPointers,
MmFlushForDelete)) {
DDbgPrint(" Cannot delete user mapped image\n");
status = STATUS_CANNOT_DELETE;
} else {
DokanCCBFlagsSetBit(ccb, DOKAN_DELETE_ON_CLOSE);
DokanFCBFlagsSetBit(fcb, DOKAN_DELETE_ON_CLOSE);
DDbgPrint(" FileObject->DeletePending = TRUE\n");
IrpEntry->FileObject->DeletePending = TRUE;
}
} else {
DokanCCBFlagsClearBit(ccb, DOKAN_DELETE_ON_CLOSE);
DokanFCBFlagsClearBit(fcb, DOKAN_DELETE_ON_CLOSE);
DDbgPrint(" FileObject->DeletePending = FALSE\n");
IrpEntry->FileObject->DeletePending = FALSE;
}
}
// if rename is executed, reassign the file name
if (infoClass == FileRenameInformation) {
PVOID buffer = NULL;
// this is used to inform rename in the bellow switch case
oldFileName.Buffer = fcb->FileName.Buffer;
oldFileName.Length = (USHORT)fcb->FileName.Length;
oldFileName.MaximumLength = (USHORT)fcb->FileName.Length;
// copy new file name
buffer = ExAllocatePool(EventInfo->BufferLength + sizeof(WCHAR));
if (buffer == NULL) {
status = STATUS_INSUFFICIENT_RESOURCES;
ExReleaseResourceLite(&ccb->Resource);
KeLeaveCriticalRegion();
__leave;
}
fcb->FileName.Buffer = buffer;
ASSERT(fcb->FileName.Buffer != NULL);
RtlZeroMemory(fcb->FileName.Buffer,
EventInfo->BufferLength + sizeof(WCHAR));
RtlCopyMemory(fcb->FileName.Buffer, EventInfo->Buffer,
EventInfo->BufferLength);
fcb->FileName.Length = (USHORT)EventInfo->BufferLength;
fcb->FileName.MaximumLength = (USHORT)EventInfo->BufferLength;
}
}
ExReleaseResourceLite(&ccb->Resource);
KeLeaveCriticalRegion();
if (NT_SUCCESS(status)) {
switch (irpSp->Parameters.SetFile.FileInformationClass) {
case FileAllocationInformation:
DokanNotifyReportChange(fcb, FILE_NOTIFY_CHANGE_SIZE,
FILE_ACTION_MODIFIED);
break;
case FileBasicInformation:
DokanNotifyReportChange(fcb, FILE_NOTIFY_CHANGE_ATTRIBUTES |
FILE_NOTIFY_CHANGE_LAST_WRITE |
FILE_NOTIFY_CHANGE_LAST_ACCESS |
FILE_NOTIFY_CHANGE_CREATION,
FILE_ACTION_MODIFIED);
break;
case FileDispositionInformation:
if (IrpEntry->FileObject->DeletePending) {
if (DokanFCBFlagsIsSet(fcb, DOKAN_FILE_DIRECTORY)) {
DokanNotifyReportChange(fcb, FILE_NOTIFY_CHANGE_DIR_NAME,
FILE_ACTION_REMOVED);
} else {
DokanNotifyReportChange(fcb, FILE_NOTIFY_CHANGE_FILE_NAME,
FILE_ACTION_REMOVED);
}
}
break;
case FileEndOfFileInformation:
DokanNotifyReportChange(fcb, FILE_NOTIFY_CHANGE_SIZE,
FILE_ACTION_MODIFIED);
break;
case FileLinkInformation:
// TODO: should check whether this is a directory
// TODO: should notify new link name
// DokanNotifyReportChange(vcb, ccb, FILE_NOTIFY_CHANGE_FILE_NAME,
// FILE_ACTION_ADDED);
break;
case FilePositionInformation:
// this is never used
break;
case FileRenameInformation: {
DokanNotifyReportChange0(fcb, &oldFileName,
FILE_NOTIFY_CHANGE_FILE_NAME,
FILE_ACTION_RENAMED_OLD_NAME);
// free old file name
ExFreePool(oldFileName.Buffer);
DokanNotifyReportChange(fcb, FILE_NOTIFY_CHANGE_FILE_NAME,
FILE_ACTION_RENAMED_NEW_NAME);
} break;
case FileValidDataLengthInformation:
DokanNotifyReportChange(fcb, FILE_NOTIFY_CHANGE_SIZE,
FILE_ACTION_MODIFIED);
break;
default:
DDbgPrint(" unknown type:%d\n",
irpSp->Parameters.SetFile.FileInformationClass);
break;
}
}
} __finally {
if(fcb)
DokanFCBUnlock(fcb);
DokanCompleteIrpRequest(irp, status, info);
DDbgPrint("<== DokanCompleteSetInformation\n");
}
}
NTSTATUS
DokanDispatchSetInformation(__in PDEVICE_OBJECT DeviceObject, __in PIRP Irp) {
NTSTATUS status = STATUS_NOT_IMPLEMENTED;
PIO_STACK_LOCATION irpSp;
PVOID buffer;
PFILE_OBJECT fileObject;
PDokanCCB ccb;
PDokanFCB fcb = NULL;
PDokanVCB vcb;
ULONG eventLength;
PFILE_OBJECT targetFileObject;
PEVENT_CONTEXT eventContext;
BOOLEAN isPagingIo = FALSE;
BOOLEAN fcbLocked = FALSE;
PFILE_END_OF_FILE_INFORMATION pInfoEoF = NULL;
vcb = DeviceObject->DeviceExtension;
__try {
DDbgPrint("==> DokanSetInformationn\n");
irpSp = IoGetCurrentIrpStackLocation(Irp);
fileObject = irpSp->FileObject;
if (fileObject == NULL) {
DDbgPrint(" fileObject == NULL\n");
status = STATUS_INVALID_PARAMETER;
__leave;
}
if (GetIdentifierType(vcb) != VCB ||
!DokanCheckCCB(vcb->Dcb, fileObject->FsContext2)) {
status = STATUS_INVALID_PARAMETER;
__leave;
}
ccb = (PDokanCCB)fileObject->FsContext2;
ASSERT(ccb != NULL);
DDbgPrint(" ProcessId %lu\n", IoGetRequestorProcessId(Irp));
DokanPrintFileName(fileObject);
buffer = Irp->AssociatedIrp.SystemBuffer;
if (Irp->Flags & IRP_PAGING_IO) {
isPagingIo = TRUE;
}
fcb = ccb->Fcb;
ASSERT(fcb != NULL);
switch (irpSp->Parameters.SetFile.FileInformationClass) {
case FileAllocationInformation:
DDbgPrint(
" FileAllocationInformation %lld\n",
((PFILE_ALLOCATION_INFORMATION)buffer)->AllocationSize.QuadPart);
break;
case FileBasicInformation:
DDbgPrint(" FileBasicInformation\n");
break;
case FileDispositionInformation:
DDbgPrint(" FileDispositionInformation\n");
break;
case FileEndOfFileInformation:
if ((fileObject->SectionObjectPointer != NULL) &&
(fileObject->SectionObjectPointer->DataSectionObject != NULL)) {
pInfoEoF = (PFILE_END_OF_FILE_INFORMATION)buffer;
if (!MmCanFileBeTruncated(fileObject->SectionObjectPointer,
&pInfoEoF->EndOfFile)) {
status = STATUS_USER_MAPPED_FILE;
__leave;
}
if (!isPagingIo) {
ExAcquireResourceExclusiveLite(&fcb->PagingIoResource, TRUE);
CcFlushCache(&fcb->SectionObjectPointers, NULL, 0, NULL);
CcPurgeCacheSection(&fcb->SectionObjectPointers, NULL, 0, FALSE);
ExReleaseResourceLite(&fcb->PagingIoResource);
}
}
DDbgPrint(" FileEndOfFileInformation %lld\n",
((PFILE_END_OF_FILE_INFORMATION)buffer)->EndOfFile.QuadPart);
break;
case FileLinkInformation:
DDbgPrint(" FileLinkInformation\n");
break;
case FilePositionInformation: {
PFILE_POSITION_INFORMATION posInfo;
posInfo = (PFILE_POSITION_INFORMATION)Irp->AssociatedIrp.SystemBuffer;
ASSERT(posInfo != NULL);
DDbgPrint(" FilePositionInformation %lld\n",
posInfo->CurrentByteOffset.QuadPart);
fileObject->CurrentByteOffset = posInfo->CurrentByteOffset;
status = STATUS_SUCCESS;
__leave;
} break;
case FileRenameInformation:
DDbgPrint(" FileRenameInformation\n");
break;
case FileValidDataLengthInformation:
DDbgPrint(" FileValidDataLengthInformation\n");
break;
default:
DDbgPrint(" unknown type:%d\n",
irpSp->Parameters.SetFile.FileInformationClass);
break;
}
//
// when this IRP is not handled in swich case
//
// calcurate the size of EVENT_CONTEXT
// it is sum of file name length and size of FileInformation
DokanFCBLockRW(fcb);
fcbLocked = TRUE;
eventLength = sizeof(EVENT_CONTEXT) + fcb->FileName.Length +
irpSp->Parameters.SetFile.Length;
targetFileObject = irpSp->Parameters.SetFile.FileObject;
if (targetFileObject) {
DDbgPrint(" FileObject Specified %wZ\n", &(targetFileObject->FileName));
eventLength += targetFileObject->FileName.Length;
}
eventContext = AllocateEventContext(vcb->Dcb, Irp, eventLength, ccb);
if (eventContext == NULL) {
status = STATUS_INSUFFICIENT_RESOURCES;
__leave;
}
eventContext->Context = ccb->UserContext;
eventContext->Operation.SetFile.FileInformationClass =
irpSp->Parameters.SetFile.FileInformationClass;
// the size of FileInformation
eventContext->Operation.SetFile.BufferLength =
irpSp->Parameters.SetFile.Length;
// the offset from begining of structure to fill FileInfo
eventContext->Operation.SetFile.BufferOffset =
FIELD_OFFSET(EVENT_CONTEXT, Operation.SetFile.FileName[0]) +
fcb->FileName.Length + sizeof(WCHAR); // the last null char
BOOLEAN isRenameOrLink = irpSp->Parameters.SetFile.FileInformationClass ==
FileRenameInformation ||
irpSp->Parameters.SetFile.FileInformationClass == FileLinkInformation;
if (!isRenameOrLink) {
// copy FileInformation
RtlCopyMemory(
(PCHAR)eventContext + eventContext->Operation.SetFile.BufferOffset,
Irp->AssociatedIrp.SystemBuffer, irpSp->Parameters.SetFile.Length);
}
if (isRenameOrLink) {
// We need to hanle FileRenameInformation separetly because the structure
// of FILE_RENAME_INFORMATION
// has HANDLE type field, which size is different in 32 bit and 64 bit
// environment.
// This cases problems when driver is 64 bit and user mode library is 32
// bit.
PFILE_RENAME_INFORMATION renameInfo =
(PFILE_RENAME_INFORMATION)Irp->AssociatedIrp.SystemBuffer;
PDOKAN_RENAME_INFORMATION renameContext = (PDOKAN_RENAME_INFORMATION)(
(PCHAR)eventContext + eventContext->Operation.SetFile.BufferOffset);
// This code assumes FILE_RENAME_INFORMATION and FILE_LINK_INFORMATION
// have
// the same typse and fields.
ASSERT(sizeof(FILE_RENAME_INFORMATION) == sizeof(FILE_LINK_INFORMATION));
renameContext->ReplaceIfExists = renameInfo->ReplaceIfExists;
renameContext->FileNameLength = renameInfo->FileNameLength;
RtlCopyMemory(renameContext->FileName, renameInfo->FileName,
renameInfo->FileNameLength);
if (targetFileObject != NULL) {
// if Parameters.SetFile.FileObject is specified, replase
// FILE_RENAME_INFO's file name by
// FileObject's file name. The buffer size is already adjusted.
DDbgPrint(" renameContext->FileNameLength %d\n",
renameContext->FileNameLength);
DDbgPrint(" renameContext->FileName %ws\n", renameContext->FileName);
RtlZeroMemory(renameContext->FileName, renameContext->FileNameLength);
PFILE_OBJECT parentFileObject = targetFileObject->RelatedFileObject;
if (parentFileObject != NULL) {
RtlCopyMemory(renameContext->FileName,
parentFileObject->FileName.Buffer,
parentFileObject->FileName.Length);
RtlStringCchCatW(renameContext->FileName, NTSTRSAFE_MAX_CCH, L"\\");
RtlStringCchCatW(renameContext->FileName, NTSTRSAFE_MAX_CCH, targetFileObject->FileName.Buffer);
renameContext->FileNameLength = targetFileObject->FileName.Length +
parentFileObject->FileName.Length + sizeof(WCHAR);
} else {
RtlCopyMemory(renameContext->FileName,
targetFileObject->FileName.Buffer,
targetFileObject->FileName.Length);
renameContext->FileNameLength = targetFileObject->FileName.Length;
}
}
if (irpSp->Parameters.SetFile.FileInformationClass ==
FileRenameInformation) {
DDbgPrint(" rename: %wZ => %ls, FileCount = %u\n", fcb->FileName,
renameContext->FileName, (ULONG)fcb->FileCount);
}
}
// copy the file name
eventContext->Operation.SetFile.FileNameLength = fcb->FileName.Length;
RtlCopyMemory(eventContext->Operation.SetFile.FileName,
fcb->FileName.Buffer, fcb->FileName.Length);
// FsRtlCheckOpLock is called with non-NULL completion routine - not blocking.
status = FsRtlCheckOplock(DokanGetFcbOplock(fcb), Irp, eventContext,
DokanOplockComplete, DokanPrePostIrp);
//
// if FsRtlCheckOplock returns STATUS_PENDING the IRP has been posted
// to service an oplock break and we need to leave now.
//
if (status != STATUS_SUCCESS) {
if (status == STATUS_PENDING) {
DDbgPrint(" FsRtlCheckOplock returned STATUS_PENDING\n");
} else {
DokanFreeEventContext(eventContext);
}
__leave;
}
// register this IRP to waiting IRP list and make it pending status
status = DokanRegisterPendingIrp(DeviceObject, Irp, eventContext, 0);
} __finally {
if(fcbLocked)
DokanFCBUnlock(fcb);
DokanCompleteIrpRequest(Irp, status, 0);
DDbgPrint("<== DokanSetInformation\n");
}
return status;
}
NTSTATUS
DokanDispatchQueryInformation(__in PDEVICE_OBJECT DeviceObject, __in PIRP Irp) {
NTSTATUS status = STATUS_NOT_IMPLEMENTED;
PIO_STACK_LOCATION irpSp;
PFILE_OBJECT fileObject;
PDokanCCB ccb;
PDokanFCB fcb = NULL;
PDokanVCB vcb;
ULONG info = 0;
ULONG eventLength;
PEVENT_CONTEXT eventContext;
BOOLEAN isNormalized = FALSE;
// PAGED_CODE();
__try {
DDbgPrint("==> DokanQueryInformation\n");
irpSp = IoGetCurrentIrpStackLocation(Irp);
fileObject = irpSp->FileObject;
DDbgPrint(" FileInfoClass %d\n",
irpSp->Parameters.QueryFile.FileInformationClass);
DDbgPrint(" ProcessId %lu\n", IoGetRequestorProcessId(Irp));
if (fileObject == NULL) {
DDbgPrint(" fileObject == NULL\n");
status = STATUS_INVALID_PARAMETER;
__leave;
}
DokanPrintFileName(fileObject);
/*
if (fileObject->FsContext2 == NULL &&
fileObject->FileName.Length == 0) {
// volume open?
status = STATUS_SUCCESS;
__leave;
}*/
vcb = DeviceObject->DeviceExtension;
if (GetIdentifierType(vcb) != VCB ||
!DokanCheckCCB(vcb->Dcb, fileObject->FsContext2)) {
status = STATUS_INVALID_PARAMETER;
__leave;
}
ccb = (PDokanCCB)fileObject->FsContext2;
ASSERT(ccb != NULL);
fcb = ccb->Fcb;
ASSERT(fcb != NULL);
DokanFCBLockRO(fcb);
switch (irpSp->Parameters.QueryFile.FileInformationClass) {
case FileBasicInformation:
DDbgPrint(" FileBasicInformation\n");
break;
case FileInternalInformation:
DDbgPrint(" FileInternalInformation\n");
break;
case FileEaInformation:
DDbgPrint(" FileEaInformation\n");
break;
case FileStandardInformation:
DDbgPrint(" FileStandardInformation\n");
break;
case FileAllInformation:
DDbgPrint(" FileAllInformation\n");
break;
case FileAlternateNameInformation:
DDbgPrint(" FileAlternateNameInformation\n");
break;
case FileAttributeTagInformation:
DDbgPrint(" FileAttributeTagInformation\n");
break;
case FileCompressionInformation:
DDbgPrint(" FileCompressionInformation\n");
break;
case FileNormalizedNameInformation:
DDbgPrint(" FileNormalizedNameInformation\n");
isNormalized = TRUE;
case FileNameInformation: {
PFILE_NAME_INFORMATION nameInfo;
DDbgPrint(" FileNameInformation\n");
nameInfo = (PFILE_NAME_INFORMATION)Irp->AssociatedIrp.SystemBuffer;
ASSERT(nameInfo != NULL);
BOOLEAN isNetworkFileSystem = (vcb->Dcb->VolumeDeviceType == FILE_DEVICE_NETWORK_FILE_SYSTEM);
PUNICODE_STRING fileName = &fcb->FileName;
USHORT length = fcb->FileName.Length;
BOOLEAN doConcat = FALSE;
if (isNetworkFileSystem) {
if (fcb->FileName.Length == 0 || fcb->FileName.Buffer[0] != L'\\') {
DDbgPrint(" NetworkFileSystem has no root folder. So return the full device name \n");
fileName = vcb->Dcb->DiskDeviceName;
length = fileName->Length;
}
else {
if (isNormalized) {
DDbgPrint(" FullFileName should be returned \n");
fileName = vcb->Dcb->DiskDeviceName;
length = fileName->Length + vcb->Dcb->DiskDeviceName->Length;
doConcat = TRUE;
}
}
}
if (irpSp->Parameters.QueryFile.Length <
sizeof(FILE_NAME_INFORMATION) + length) {
info = irpSp->Parameters.QueryFile.Length;
status = STATUS_BUFFER_OVERFLOW;
} else {
RtlZeroMemory(Irp->AssociatedIrp.SystemBuffer, irpSp->Parameters.QueryFile.Length);
nameInfo->FileNameLength = fileName->Length;
RtlCopyMemory(&nameInfo->FileName[0], fileName->Buffer,
fileName->Length);
if (doConcat) {
DDbgPrint(" Concat the devicename with the filename to get the fullname of the file \n");
RtlStringCchCatW(nameInfo->FileName, NTSTRSAFE_MAX_CCH, fcb->FileName.Buffer);
}
info = FIELD_OFFSET(FILE_NAME_INFORMATION, FileName[0]) +
length;
status = STATUS_SUCCESS;
}
__leave;
} break;
case FileNetworkOpenInformation:
DDbgPrint(" FileNetworkOpenInformation\n");
break;
case FilePositionInformation: {
PFILE_POSITION_INFORMATION posInfo;
DDbgPrint(" FilePositionInformation\n");
if (irpSp->Parameters.QueryFile.Length <
sizeof(FILE_POSITION_INFORMATION)) {
status = STATUS_INFO_LENGTH_MISMATCH;
} else {
posInfo = (PFILE_POSITION_INFORMATION)Irp->AssociatedIrp.SystemBuffer;
ASSERT(posInfo != NULL);
RtlZeroMemory(posInfo, sizeof(FILE_POSITION_INFORMATION));
if (fileObject->CurrentByteOffset.QuadPart < 0) {
status = STATUS_INVALID_PARAMETER;
} else {
// set the current file offset
posInfo->CurrentByteOffset = fileObject->CurrentByteOffset;
info = sizeof(FILE_POSITION_INFORMATION);
status = STATUS_SUCCESS;
}
}
__leave;
} break;
case FileStreamInformation:
DDbgPrint(" FileStreamInformation\n");
break;
case FileStandardLinkInformation:
DDbgPrint(" FileStandardLinkInformation\n");
break;
case FileNetworkPhysicalNameInformation:
DDbgPrint(" FileNetworkPhysicalNameInformation\n");
break;
case FileRemoteProtocolInformation:
DDbgPrint(" FileRemoteProtocolInformation\n");
break;
default:
DDbgPrint(" unknown type:%d\n",
irpSp->Parameters.QueryFile.FileInformationClass);
break;
}
// if it is not treadted in swich case
// calculate the length of EVENT_CONTEXT
// sum of it's size and file name length
eventLength = sizeof(EVENT_CONTEXT) + fcb->FileName.Length;
eventContext = AllocateEventContext(vcb->Dcb, Irp, eventLength, ccb);
if (eventContext == NULL) {
status = STATUS_INSUFFICIENT_RESOURCES;
__leave;
}
eventContext->Context = ccb->UserContext;
// DDbgPrint(" get Context %X\n", (ULONG)ccb->UserContext);
eventContext->Operation.File.FileInformationClass =
irpSp->Parameters.QueryFile.FileInformationClass;
// bytes length which is able to be returned
eventContext->Operation.File.BufferLength =
irpSp->Parameters.QueryFile.Length;
// copy file name to EventContext from FCB
eventContext->Operation.File.FileNameLength = fcb->FileName.Length;
RtlCopyMemory(eventContext->Operation.File.FileName, fcb->FileName.Buffer,
fcb->FileName.Length);
// register this IRP to pending IPR list
status = DokanRegisterPendingIrp(DeviceObject, Irp, eventContext, 0);
} __finally {
if(fcb)
DokanFCBUnlock(fcb);
DokanCompleteIrpRequest(Irp, status, info);
DDbgPrint("<== DokanQueryInformation\n");
}
return status;
}
NTSTATUS
DokanDispatchRead(__in PDEVICE_OBJECT DeviceObject, __in PIRP Irp)
/*++
Routine Description:
This device control dispatcher handles read IRPs.
Arguments:
DeviceObject - Context for the activity.
Irp - The device control argument block.
Return Value:
NTSTATUS
--*/
{
PIO_STACK_LOCATION irpSp;
PFILE_OBJECT fileObject;
ULONG bufferLength;
LARGE_INTEGER byteOffset;
NTSTATUS status = STATUS_INVALID_PARAMETER;
ULONG readLength = 0;
PDokanCCB ccb;
PDokanFCB fcb = NULL;
PDokanVCB vcb;
PVOID currentAddress = NULL;
PEVENT_CONTEXT eventContext;
ULONG eventLength;
BOOLEAN fcbLocked = FALSE;
BOOLEAN isPagingIo = FALSE;
BOOLEAN isSynchronousIo = FALSE;
BOOLEAN noCache = FALSE;
__try {
DDbgPrint("==> DokanRead\n");
irpSp = IoGetCurrentIrpStackLocation(Irp);
fileObject = irpSp->FileObject;
//
// If this is a zero length read then return SUCCESS immediately.
//
if (irpSp->Parameters.Read.Length == 0) {
DDbgPrint(" Parameters.Read.Length == 0 \n");
Irp->IoStatus.Information = 0;
status = STATUS_SUCCESS;
__leave;
}
if (irpSp->MinorFunction == IRP_MN_COMPLETE) {
Irp->MdlAddress = NULL;
status = STATUS_SUCCESS;
__leave;
}
if (fileObject == NULL && Irp->MdlAddress != NULL) {
DDbgPrint(" Reads by File System Recognizers\n");
currentAddress = MmGetSystemAddressForMdlNormalSafe(Irp->MdlAddress);
if (currentAddress == NULL) {
status = STATUS_INSUFFICIENT_RESOURCES;
__leave;
}
// here we could return the bootsector. If we don't have one
// the requested read lenght must be returned as requested
readLength = irpSp->Parameters.Read.Length;
status = STATUS_SUCCESS;
__leave;
}
if (fileObject == NULL) {
DDbgPrint(" fileObject == NULL\n");
status = STATUS_INVALID_DEVICE_REQUEST;
__leave;
}
vcb = DeviceObject->DeviceExtension;
if (GetIdentifierType(vcb) != VCB ||
!DokanCheckCCB(vcb->Dcb, fileObject->FsContext2)) {
status = STATUS_INVALID_DEVICE_REQUEST;
__leave;
}
bufferLength = irpSp->Parameters.Read.Length;
if (irpSp->Parameters.Read.ByteOffset.LowPart ==
FILE_USE_FILE_POINTER_POSITION &&
irpSp->Parameters.Read.ByteOffset.HighPart == -1) {
// irpSp->Parameters.Read.ByteOffset == NULL don't need check?
DDbgPrint("use FileObject ByteOffset\n");
byteOffset = fileObject->CurrentByteOffset;
} else {
byteOffset = irpSp->Parameters.Read.ByteOffset;
}
DDbgPrint(" ProcessId %lu\n", IoGetRequestorProcessId(Irp));
DokanPrintFileName(fileObject);
DDbgPrint(" ByteCount:%lu ByteOffset:%I64d\n", bufferLength,
byteOffset.QuadPart);
if (bufferLength == 0) {
status = STATUS_SUCCESS;
readLength = 0;
__leave;
}
// make a MDL for UserBuffer that can be used later on another thread
// context
if (Irp->MdlAddress == NULL) {
status = DokanAllocateMdl(Irp, irpSp->Parameters.Read.Length);
if (!NT_SUCCESS(status)) {
__leave;
}
}
ccb = fileObject->FsContext2;
ASSERT(ccb != NULL);
fcb = ccb->Fcb;
ASSERT(fcb != NULL);
if (DokanFCBFlagsIsSet(fcb, DOKAN_FILE_DIRECTORY)) {
DDbgPrint(" DOKAN_FILE_DIRECTORY %p\n", fcb);
status = STATUS_INVALID_PARAMETER;
__leave;
}
if (Irp->Flags & IRP_PAGING_IO) {
isPagingIo = TRUE;
}
if (fileObject->Flags & FO_SYNCHRONOUS_IO) {
isSynchronousIo = TRUE;
}
if (Irp->Flags & IRP_NOCACHE) {
noCache = TRUE;
}
if (!isPagingIo && (fileObject->SectionObjectPointer != NULL) &&
(fileObject->SectionObjectPointer->DataSectionObject != NULL)) {
ExAcquireResourceExclusiveLite(&fcb->PagingIoResource, TRUE);
CcFlushCache(&fcb->SectionObjectPointers,
&irpSp->Parameters.Read.ByteOffset,
irpSp->Parameters.Read.Length, NULL);
ExReleaseResourceLite(&fcb->PagingIoResource);
}
DokanFCBLockRO(fcb);
fcbLocked = TRUE;
// length of EventContext is sum of file name length and itself
eventLength = sizeof(EVENT_CONTEXT) + fcb->FileName.Length;
eventContext = AllocateEventContext(vcb->Dcb, Irp, eventLength, ccb);
if (eventContext == NULL) {
status = STATUS_INSUFFICIENT_RESOURCES;
__leave;
}
eventContext->Context = ccb->UserContext;
// DDbgPrint(" get Context %X\n", (ULONG)ccb->UserContext);
if (isPagingIo) {
DDbgPrint(" Paging IO\n");
eventContext->FileFlags |= DOKAN_PAGING_IO;
}
if (isSynchronousIo) {
DDbgPrint(" Synchronous IO\n");
eventContext->FileFlags |= DOKAN_SYNCHRONOUS_IO;
}
if (noCache) {
DDbgPrint(" Nocache\n");
eventContext->FileFlags |= DOKAN_NOCACHE;
}
// offset of file to read
eventContext->Operation.Read.ByteOffset = byteOffset;
// buffer size for read
// user-mode file system application can return this size
eventContext->Operation.Read.BufferLength = irpSp->Parameters.Read.Length;
// copy the accessed file name
eventContext->Operation.Read.FileNameLength = fcb->FileName.Length;
RtlCopyMemory(eventContext->Operation.Read.FileName, fcb->FileName.Buffer,
fcb->FileName.Length);
//
// We now check whether we can proceed based on the state of
// the file oplocks.
//
if (!FlagOn(Irp->Flags, IRP_PAGING_IO)) {
// FsRtlCheckOpLock is called with non-NULL completion routine - not blocking.
status = FsRtlCheckOplock(DokanGetFcbOplock(fcb), Irp, eventContext,
DokanOplockComplete, DokanPrePostIrp);
//
// if FsRtlCheckOplock returns STATUS_PENDING the IRP has been posted
// to service an oplock break and we need to leave now.
//
if (status != STATUS_SUCCESS) {
if (status == STATUS_PENDING) {
DDbgPrint(" FsRtlCheckOplock returned STATUS_PENDING\n");
} else {
DokanFreeEventContext(eventContext);
}
__leave;
}
//
// We have to check for read access according to the current
// state of the file locks, and set FileSize from the Fcb.
//
// FsRtlCheckLockForReadAccess does not block.
if (!FsRtlCheckLockForReadAccess(&fcb->FileLock, Irp)) {
status = STATUS_FILE_LOCK_CONFLICT;
__leave;
}
}
// register this IRP to pending IPR list and make it pending status
status = DokanRegisterPendingIrp(DeviceObject, Irp, eventContext, 0);
} __finally {
if(fcbLocked)
DokanFCBUnlock(fcb);
DokanCompleteIrpRequest(Irp, status, readLength);
DDbgPrint("<== DokanRead\n");
}
return status;
}
VOID DokanCompleteWrite(__in PIRP_ENTRY IrpEntry,
__in PEVENT_INFORMATION EventInfo) {
PIRP irp;
PIO_STACK_LOCATION irpSp;
NTSTATUS status = STATUS_SUCCESS;
PDokanCCB ccb;
PDokanFCB fcb;
PFILE_OBJECT fileObject;
fileObject = IrpEntry->FileObject;
ASSERT(fileObject != NULL);
DDbgPrint("==> DokanCompleteWrite %wZ\n", &fileObject->FileName);
irp = IrpEntry->Irp;
irpSp = IrpEntry->IrpSp;
ccb = fileObject->FsContext2;
ASSERT(ccb != NULL);
fcb = ccb->Fcb;
ASSERT(fcb != NULL);
ccb->UserContext = EventInfo->Context;
// DDbgPrint(" set Context %X\n", (ULONG)ccb->UserContext);
status = EventInfo->Status;
irp->IoStatus.Status = status;
irp->IoStatus.Information = EventInfo->BufferLength;
if (NT_SUCCESS(status)) {
//Check if file size changed
if (fcb->AdvancedFCBHeader.FileSize.QuadPart <
EventInfo->Operation.Write.CurrentByteOffset.QuadPart) {
if (!(irp->Flags & IRP_PAGING_IO)) {
DokanFCBLockRO(fcb);
}
DokanNotifyReportChange(fcb, FILE_NOTIFY_CHANGE_SIZE,
FILE_ACTION_MODIFIED);
if (!(irp->Flags & IRP_PAGING_IO)) {
DokanFCBUnlock(fcb);
}
//Update size with new offset
InterlockedExchange64(
&fcb->AdvancedFCBHeader.FileSize.QuadPart,
EventInfo->Operation.Write.CurrentByteOffset.QuadPart);
}
DokanFCBFlagsSetBit(fcb, DOKAN_FILE_CHANGE_LAST_WRITE);
if (EventInfo->BufferLength != 0 && fileObject->Flags & FO_SYNCHRONOUS_IO &&
!(irp->Flags & IRP_PAGING_IO)) {
// update current byte offset only when synchronous IO and not paging IO
fileObject->CurrentByteOffset.QuadPart =
EventInfo->Operation.Write.CurrentByteOffset.QuadPart;
DDbgPrint(" Updated CurrentByteOffset %I64d\n",
fileObject->CurrentByteOffset.QuadPart);
}
}
DokanCompleteIrpRequest(irp, irp->IoStatus.Status, irp->IoStatus.Information);
DDbgPrint("<== DokanCompleteWrite\n");
}
NTSTATUS
DokanQueryDirectory(__in PDEVICE_OBJECT DeviceObject, __in PIRP Irp) {
PFILE_OBJECT fileObject;
PIO_STACK_LOCATION irpSp;
PDokanVCB vcb;
PDokanCCB ccb;
PDokanFCB fcb;
NTSTATUS status;
ULONG eventLength;
PEVENT_CONTEXT eventContext;
ULONG index;
BOOLEAN initial;
ULONG flags = 0;
irpSp = IoGetCurrentIrpStackLocation(Irp);
fileObject = irpSp->FileObject;
vcb = DeviceObject->DeviceExtension;
if (GetIdentifierType(vcb) != VCB) {
return STATUS_INVALID_PARAMETER;
}
ccb = fileObject->FsContext2;
if (ccb == NULL) {
return STATUS_INVALID_PARAMETER;
}
ASSERT(ccb != NULL);
if (irpSp->Flags & SL_INDEX_SPECIFIED) {
DDbgPrint(" index specified %d\n",
irpSp->Parameters.QueryDirectory.FileIndex);
}
if (irpSp->Flags & SL_RETURN_SINGLE_ENTRY) {
DDbgPrint(" return single entry\n");
}
if (irpSp->Flags & SL_RESTART_SCAN) {
DDbgPrint(" restart scan\n");
}
if (irpSp->Parameters.QueryDirectory.FileName) {
DDbgPrint(" pattern:%wZ\n", irpSp->Parameters.QueryDirectory.FileName);
}
switch (irpSp->Parameters.QueryDirectory.FileInformationClass) {
case FileDirectoryInformation:
DDbgPrint(" FileDirectoryInformation\n");
break;
case FileFullDirectoryInformation:
DDbgPrint(" FileFullDirectoryInformation\n");
break;
case FileNamesInformation:
DDbgPrint(" FileNamesInformation\n");
break;
case FileBothDirectoryInformation:
DDbgPrint(" FileBothDirectoryInformation\n");
break;
case FileIdBothDirectoryInformation:
DDbgPrint(" FileIdBothDirectoryInformation\n");
break;
default:
DDbgPrint(" unknown FileInfoClass %d\n",
irpSp->Parameters.QueryDirectory.FileInformationClass);
break;
}
// make a MDL for UserBuffer that can be used later on another thread context
if (Irp->MdlAddress == NULL) {
status = DokanAllocateMdl(Irp, irpSp->Parameters.QueryDirectory.Length);
if (!NT_SUCCESS(status)) {
return status;
}
flags = DOKAN_MDL_ALLOCATED;
}
fcb = ccb->Fcb;
ASSERT(fcb != NULL);
DokanFCBLockRO(fcb);
// size of EVENT_CONTEXT is sum of its length and file name length
eventLength = sizeof(EVENT_CONTEXT) + fcb->FileName.Length;
initial = (BOOLEAN)(ccb->SearchPattern == NULL &&
!(ccb->Flags & DOKAN_DIR_MATCH_ALL));
// this is an initial query
if (initial) {
DDbgPrint(" initial query\n");
// and search pattern is provided
if (irpSp->Parameters.QueryDirectory.FileName) {
// free current search pattern stored in CCB
if (ccb->SearchPattern)
ExFreePool(ccb->SearchPattern);
// the size of search pattern
ccb->SearchPatternLength =
irpSp->Parameters.QueryDirectory.FileName->Length;
ccb->SearchPattern =
ExAllocatePool(ccb->SearchPatternLength + sizeof(WCHAR));
if (ccb->SearchPattern == NULL) {
DokanFCBUnlock(fcb);
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlZeroMemory(ccb->SearchPattern,
ccb->SearchPatternLength + sizeof(WCHAR));
// copy provided search pattern to CCB
RtlCopyMemory(ccb->SearchPattern,
irpSp->Parameters.QueryDirectory.FileName->Buffer,
ccb->SearchPatternLength);
} else {
ccb->Flags |= DOKAN_DIR_MATCH_ALL;
}
}
// if search pattern is provided, add the length of it to store pattern
if (ccb->SearchPattern) {
eventLength += ccb->SearchPatternLength;
}
eventContext = AllocateEventContext(vcb->Dcb, Irp, eventLength, ccb);
if (eventContext == NULL) {
DokanFCBUnlock(fcb);
return STATUS_INSUFFICIENT_RESOURCES;
}
eventContext->Context = ccb->UserContext;
// DDbgPrint(" get Context %X\n", (ULONG)ccb->UserContext);
// index which specified index-1 th directory entry has been returned
// this time, 'index'th entry should be returned
index = 0;
if (irpSp->Flags & SL_INDEX_SPECIFIED) {
index = irpSp->Parameters.QueryDirectory.FileIndex;
DDbgPrint(" using FileIndex %d\n", index);
} else if (FlagOn(irpSp->Flags, SL_RESTART_SCAN)) {
DDbgPrint(" SL_RESTART_SCAN\n");
index = 0;
} else {
index = (ULONG)ccb->Context;
DDbgPrint(" ccb->Context %d\n", index);
}
eventContext->Operation.Directory.FileInformationClass =
irpSp->Parameters.QueryDirectory.FileInformationClass;
eventContext->Operation.Directory.BufferLength =
irpSp->Parameters.QueryDirectory.Length; // length of buffer
eventContext->Operation.Directory.FileIndex =
index; // directory index which should be returned this time
// copying file name(directory name)
eventContext->Operation.Directory.DirectoryNameLength = fcb->FileName.Length;
RtlCopyMemory(eventContext->Operation.Directory.DirectoryName,
fcb->FileName.Buffer, fcb->FileName.Length);
DokanFCBUnlock(fcb);
// if search pattern is specified, copy it to EventContext
if (ccb->SearchPatternLength && ccb->SearchPattern) {
PVOID searchBuffer;
eventContext->Operation.Directory.SearchPatternLength =
ccb->SearchPatternLength;
eventContext->Operation.Directory.SearchPatternOffset =
eventContext->Operation.Directory.DirectoryNameLength;
searchBuffer = (PVOID)(
(SIZE_T)&eventContext->Operation.Directory.SearchPatternBase[0] +
(SIZE_T)eventContext->Operation.Directory.SearchPatternOffset);
RtlCopyMemory(searchBuffer, ccb->SearchPattern, ccb->SearchPatternLength);
DDbgPrint(" ccb->SearchPattern %ws\n", ccb->SearchPattern);
}
status = DokanRegisterPendingIrp(DeviceObject, Irp, eventContext, flags);
return status;
}
NTSTATUS
DokanDispatchCleanup(__in PDEVICE_OBJECT DeviceObject, __in PIRP Irp)
/*++
Routine Description:
This device control dispatcher handles Cleanup IRP.
Arguments:
DeviceObject - Context for the activity.
Irp - The device control argument block.
Return Value:
NTSTATUS
--*/
{
PDokanVCB vcb;
PIO_STACK_LOCATION irpSp;
NTSTATUS status = STATUS_INVALID_PARAMETER;
PFILE_OBJECT fileObject;
PDokanCCB ccb = NULL;
PDokanFCB fcb = NULL;
PEVENT_CONTEXT eventContext;
ULONG eventLength;
DOKAN_INIT_LOGGER(logger, DeviceObject->DriverObject, IRP_MJ_CLEANUP);
__try {
DDbgPrint("==> DokanCleanup\n");
irpSp = IoGetCurrentIrpStackLocation(Irp);
fileObject = irpSp->FileObject;
DDbgPrint(" ProcessId %lu\n", IoGetRequestorProcessId(Irp));
DokanPrintFileName(fileObject);
// Cleanup must be success in any case
if (fileObject == NULL) {
DDbgPrint(" fileObject == NULL\n");
status = STATUS_SUCCESS;
__leave;
}
vcb = DeviceObject->DeviceExtension;
if (vcb == NULL) {
DDbgPrint(" No device extension\n");
status = STATUS_SUCCESS;
__leave;
}
if (GetIdentifierType(vcb) != VCB ||
!DokanCheckCCB(vcb->Dcb, fileObject->FsContext2)) {
status = STATUS_SUCCESS;
__leave;
}
ccb = fileObject->FsContext2;
ASSERT(ccb != NULL);
fcb = ccb->Fcb;
ASSERT(fcb != NULL);
if (fcb->IsKeepalive) {
DokanFCBLockRW(fcb);
BOOLEAN shouldUnmount = ccb->IsKeepaliveActive;
if (shouldUnmount) {
// Here we intentionally let the VCB-level flag stay set, because
// there's no sense in having an opportunity for an "operation timeout
// unmount" in this case.
ccb->IsKeepaliveActive = FALSE;
}
DokanFCBUnlock(fcb);
if (shouldUnmount) {
if (IsUnmountPendingVcb(vcb)) {
DokanLogInfo(&logger,
L"Ignoring keepalive close because unmount is already in"
L" progress.");
} else {
DokanLogInfo(&logger, L"Unmounting due to keepalive close.");
DokanUnmount(vcb->Dcb);
}
}
}
if (fcb->BlockUserModeDispatch) {
status = STATUS_SUCCESS;
__leave;
}
FlushFcb(fcb, fileObject);
DokanFCBLockRW(fcb);
eventLength = sizeof(EVENT_CONTEXT) + fcb->FileName.Length;
eventContext = AllocateEventContext(vcb->Dcb, Irp, eventLength, ccb);
if (eventContext == NULL) {
status = STATUS_INSUFFICIENT_RESOURCES;
DokanFCBUnlock(fcb);
__leave;
}
fileObject->Flags |= FO_CLEANUP_COMPLETE;
eventContext->Context = ccb->UserContext;
eventContext->FileFlags |= DokanCCBFlagsGet(ccb);
// DDbgPrint(" get Context %X\n", (ULONG)ccb->UserContext);
// copy the filename to EventContext from ccb
eventContext->Operation.Cleanup.FileNameLength = fcb->FileName.Length;
RtlCopyMemory(eventContext->Operation.Cleanup.FileName,
fcb->FileName.Buffer, fcb->FileName.Length);
// FsRtlCheckOpLock is called with non-NULL completion routine - not blocking.
status = FsRtlCheckOplock(DokanGetFcbOplock(fcb), Irp, eventContext,
DokanOplockComplete, DokanPrePostIrp);
DokanFCBUnlock(fcb);
//
// if FsRtlCheckOplock returns STATUS_PENDING the IRP has been posted
// to service an oplock break and we need to leave now.
//
if (status != STATUS_SUCCESS) {
if (status == STATUS_PENDING) {
DDbgPrint(" FsRtlCheckOplock returned STATUS_PENDING\n");
} else {
DokanFreeEventContext(eventContext);
}
__leave;
}
// register this IRP to pending IRP list
status = DokanRegisterPendingIrp(DeviceObject, Irp, eventContext, 0);
} __finally {
DokanCompleteIrpRequest(Irp, status, 0);
DDbgPrint("<== DokanCleanup\n");
}
return status;
}
NTSTATUS
DokanDispatchCleanup(__in PDEVICE_OBJECT DeviceObject, __in PIRP Irp)
/*++
Routine Description:
This device control dispatcher handles Cleanup IRP.
Arguments:
DeviceObject - Context for the activity.
Irp - The device control argument block.
Return Value:
NTSTATUS
--*/
{
PDokanVCB vcb;
PIO_STACK_LOCATION irpSp;
NTSTATUS status = STATUS_INVALID_PARAMETER;
PFILE_OBJECT fileObject;
PDokanCCB ccb = NULL;
PDokanFCB fcb = NULL;
PEVENT_CONTEXT eventContext;
ULONG eventLength;
__try {
DDbgPrint("==> DokanCleanup\n");
irpSp = IoGetCurrentIrpStackLocation(Irp);
fileObject = irpSp->FileObject;
DDbgPrint(" ProcessId %lu\n", IoGetRequestorProcessId(Irp));
DokanPrintFileName(fileObject);
// Cleanup must be success in any case
if (fileObject == NULL) {
DDbgPrint(" fileObject == NULL\n");
status = STATUS_SUCCESS;
__leave;
}
vcb = DeviceObject->DeviceExtension;
if (vcb == NULL) {
DDbgPrint(" No device extension\n");
status = STATUS_SUCCESS;
__leave;
}
if (GetIdentifierType(vcb) != VCB ||
!DokanCheckCCB(vcb->Dcb, fileObject->FsContext2)) {
status = STATUS_SUCCESS;
__leave;
}
ccb = fileObject->FsContext2;
ASSERT(ccb != NULL);
fcb = ccb->Fcb;
ASSERT(fcb != NULL);
FlushFcb(fcb, fileObject);
DokanFCBLockRW(fcb);
eventLength = sizeof(EVENT_CONTEXT) + fcb->FileName.Length;
eventContext = AllocateEventContext(vcb->Dcb, Irp, eventLength, ccb);
if (eventContext == NULL) {
status = STATUS_INSUFFICIENT_RESOURCES;
DokanFCBUnlock(fcb);
__leave;
}
fileObject->Flags |= FO_CLEANUP_COMPLETE;
eventContext->Context = ccb->UserContext;
eventContext->FileFlags |= DokanCCBFlagsGet(ccb);
// DDbgPrint(" get Context %X\n", (ULONG)ccb->UserContext);
// copy the filename to EventContext from ccb
eventContext->Operation.Cleanup.FileNameLength = fcb->FileName.Length;
RtlCopyMemory(eventContext->Operation.Cleanup.FileName,
fcb->FileName.Buffer, fcb->FileName.Length);
// FsRtlCheckOpLock is called with non-NULL completion routine - not blocking.
status = FsRtlCheckOplock(DokanGetFcbOplock(fcb), Irp, eventContext,
DokanOplockComplete, DokanPrePostIrp);
DokanFCBUnlock(fcb);
//
// if FsRtlCheckOplock returns STATUS_PENDING the IRP has been posted
// to service an oplock break and we need to leave now.
//
if (status != STATUS_SUCCESS) {
if (status == STATUS_PENDING) {
DDbgPrint(" FsRtlCheckOplock returned STATUS_PENDING\n");
} else {
DokanFreeEventContext(eventContext);
}
__leave;
}
// register this IRP to pending IRP list
status = DokanRegisterPendingIrp(DeviceObject, Irp, eventContext, 0);
} __finally {
DokanCompleteIrpRequest(Irp, status, 0);
DDbgPrint("<== DokanCleanup\n");
}
return status;
}
NTSTATUS
DokanCommonLockControl(__in PIRP Irp) {
NTSTATUS Status = STATUS_SUCCESS;
PDokanFCB Fcb;
PDokanCCB Ccb;
PFILE_OBJECT fileObject;
PIO_STACK_LOCATION irpSp = IoGetCurrentIrpStackLocation(Irp);
DDbgPrint("==> DokanCommonLockControl\n");
PAGED_CODE();
fileObject = irpSp->FileObject;
DokanPrintFileName(fileObject);
Ccb = fileObject->FsContext2;
if (Ccb == NULL || Ccb->Identifier.Type != CCB) {
DDbgPrint(" DokanOplockRequest STATUS_INVALID_PARAMETER\n");
return STATUS_INVALID_PARAMETER;
}
Fcb = Ccb->Fcb;
if (Fcb == NULL || Fcb->Identifier.Type != FCB) {
DDbgPrint(" DokanOplockRequest STATUS_INVALID_PARAMETER\n");
return STATUS_INVALID_PARAMETER;
}
DokanFCBLockRW(Fcb);
//
// If the file is not a user file open then we reject the request
// as an invalid parameter
//
if (FlagOn(Fcb->Flags, DOKAN_FILE_DIRECTORY)) {
DDbgPrint(" DokanCommonLockControl -> STATUS_INVALID_PARAMETER\n", 0);
DokanFCBUnlock(Fcb);
return STATUS_INVALID_PARAMETER;
}
try {
//
// We check whether we can proceed
// based on the state of the file oplocks.
//
#if (NTDDI_VERSION >= NTDDI_WIN8)
if (((IRP_MN_LOCK == irpSp->MinorFunction) &&
((ULONGLONG)irpSp->Parameters.LockControl.ByteOffset.QuadPart <
(ULONGLONG)Fcb->AdvancedFCBHeader.AllocationSize.QuadPart)) ||
((IRP_MN_LOCK != irpSp->MinorFunction) &&
FsRtlAreThereWaitingFileLocks(&Fcb->FileLock))) {
//
// Check whether we can proceed based on the state of file oplocks if doing
// an operation that interferes with oplocks. Those operations are:
//
// 1. Lock a range within the file's AllocationSize.
// 2. Unlock a range when there are waiting locks on the file. This one
// is not guaranteed to interfere with oplocks, but it could, as
// unlocking this range might cause a waiting lock to be granted
// within AllocationSize!
//
#endif
// Dokan DokanOplockComplete sends the operation to user mode, which isn't
// what we want to do
// so now wait for the oplock to be broken (pass in NULL for the callback)
Status =
FsRtlCheckOplock(DokanGetFcbOplock(Fcb), Irp, NULL /* EventContext */,
NULL /*DokanOplockComplete*/, NULL);
#if (NTDDI_VERSION >= NTDDI_WIN8)
}
#endif
// If we were waiting for the callback, then STATUS_PENDING would be ok too
if (Status != STATUS_SUCCESS) {
__leave;
}
//
// Now call the FsRtl routine to do the actual processing of the
// Lock request
//
Status = FsRtlProcessFileLock(&Fcb->FileLock, Irp, NULL);
} finally {
DokanFCBUnlock(Fcb);
}
DDbgPrint("<== DokanCommonLockControl\n");
return Status;
}
NTSTATUS
DokanDispatchLock(__in PDEVICE_OBJECT DeviceObject, __in PIRP Irp) {
PIO_STACK_LOCATION irpSp;
NTSTATUS status = STATUS_INVALID_PARAMETER;
PFILE_OBJECT fileObject;
PDokanCCB ccb;
PDokanFCB fcb = NULL;
PDokanVCB vcb;
PDokanDCB dcb;
PEVENT_CONTEXT eventContext = NULL;
ULONG eventLength;
BOOLEAN completeIrp = TRUE;
__try {
DDbgPrint("==> DokanLock\n");
irpSp = IoGetCurrentIrpStackLocation(Irp);
fileObject = irpSp->FileObject;
if (fileObject == NULL) {
DDbgPrint(" fileObject == NULL\n");
status = STATUS_INVALID_PARAMETER;
__leave;
}
vcb = DeviceObject->DeviceExtension;
if (GetIdentifierType(vcb) != VCB ||
!DokanCheckCCB(vcb->Dcb, fileObject->FsContext2)) {
status = STATUS_INVALID_PARAMETER;
__leave;
}
dcb = vcb->Dcb;
DDbgPrint(" ProcessId %lu\n", IoGetRequestorProcessId(Irp));
DokanPrintFileName(fileObject);
switch (irpSp->MinorFunction) {
case IRP_MN_LOCK:
DDbgPrint(" IRP_MN_LOCK\n");
break;
case IRP_MN_UNLOCK_ALL:
DDbgPrint(" IRP_MN_UNLOCK_ALL\n");
break;
case IRP_MN_UNLOCK_ALL_BY_KEY:
DDbgPrint(" IRP_MN_UNLOCK_ALL_BY_KEY\n");
break;
case IRP_MN_UNLOCK_SINGLE:
DDbgPrint(" IRP_MN_UNLOCK_SINGLE\n");
break;
default:
DDbgPrint(" unknown function : %d\n", irpSp->MinorFunction);
break;
}
ccb = fileObject->FsContext2;
ASSERT(ccb != NULL);
fcb = ccb->Fcb;
ASSERT(fcb != NULL);
DokanFCBLockRW(fcb);
if (dcb->FileLockInUserMode) {
eventLength = sizeof(EVENT_CONTEXT) + fcb->FileName.Length;
eventContext = AllocateEventContext(vcb->Dcb, Irp, eventLength, ccb);
if (eventContext == NULL) {
status = STATUS_INSUFFICIENT_RESOURCES;
__leave;
}
eventContext->Context = ccb->UserContext;
DDbgPrint(" get Context %X\n", (ULONG)ccb->UserContext);
// copy file name to be locked
eventContext->Operation.Lock.FileNameLength = fcb->FileName.Length;
RtlCopyMemory(eventContext->Operation.Lock.FileName, fcb->FileName.Buffer,
fcb->FileName.Length);
// parameters of Lock
eventContext->Operation.Lock.ByteOffset =
irpSp->Parameters.LockControl.ByteOffset;
if (irpSp->Parameters.LockControl.Length != NULL) {
eventContext->Operation.Lock.Length.QuadPart =
irpSp->Parameters.LockControl.Length->QuadPart;
} else {
DDbgPrint(" LockControl.Length = NULL\n");
}
eventContext->Operation.Lock.Key = irpSp->Parameters.LockControl.Key;
// register this IRP to waiting IRP list and make it pending status
status = DokanRegisterPendingIrp(DeviceObject, Irp, eventContext, 0);
} else {
status = DokanCommonLockControl(Irp);
completeIrp = FALSE;
}
} __finally {
if(fcb)
DokanFCBUnlock(fcb);
if (completeIrp) {
DokanCompleteIrpRequest(Irp, status, 0);
}
DDbgPrint("<== DokanLock\n");
}
return status;
}
