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[NTOSKRNL]
- Implement FsRtlNotifyFilterReportChange - Implement FsRtlNotifyUpdateBuffer - Implement FsRtlCancelNotify - Implement FsRtlNotifyGetLastPartOffset - Fix implementation of FsRtlNotifyFilterChangeDirectory This finishes the implementation of file system notifications inside the kernel. Data are properly returned to the caller on changes. CORE-2582 svn path=/trunk/; revision=62442
This commit is contained in:
Pierre Schweitzer
parent
ce66ff5056
commit
623048035a
2 changed files with 730 additions and 51 deletions
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@ -12,6 +12,55 @@
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#define NDEBUG
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#include <debug.h>
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/* INLINED FUNCTIONS *********************************************************/
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/*
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* @implemented
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*/
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FORCEINLINE
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VOID
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FsRtlNotifyAcquireFastMutex(IN PREAL_NOTIFY_SYNC RealNotifySync)
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{
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ULONG_PTR CurrentThread = (ULONG_PTR)KeGetCurrentThread();
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/* Only acquire fast mutex if it's not already acquired by the current thread */
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if (RealNotifySync->OwningThread != CurrentThread)
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{
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ExAcquireFastMutexUnsafe(&(RealNotifySync->FastMutex));
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RealNotifySync->OwningThread = CurrentThread;
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}
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/* Whatever the case, keep trace of the attempt to acquire fast mutex */
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RealNotifySync->OwnerCount++;
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}
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/*
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* @implemented
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*/
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FORCEINLINE
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VOID
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FsRtlNotifyReleaseFastMutex(IN PREAL_NOTIFY_SYNC RealNotifySync)
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{
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RealNotifySync->OwnerCount--;
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/* Release the fast mutex only if no other instance needs it */
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if (!RealNotifySync->OwnerCount)
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{
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ExReleaseFastMutexUnsafe(&(RealNotifySync->FastMutex));
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RealNotifySync->OwningThread = (ULONG_PTR)0;
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}
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}
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#define FsRtlNotifyGetLastPartOffset(FullLen, TargLen, Type, Chr) \
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for (FullPosition = 0; FullPosition < FullLen; ++FullPosition) \
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if (((Type)NotifyChange->FullDirectoryName->Buffer)[FullPosition] == Chr) \
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++FullNumberOfParts; \
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for (LastPartOffset = 0; LastPartOffset < TargLen; ++LastPartOffset) { \
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if ( ((Type)TargetDirectory.Buffer)[LastPartOffset] == Chr) { \
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++TargetNumberOfParts; \
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if (TargetNumberOfParts == FullNumberOfParts) \
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break; \
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} \
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}
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/* PRIVATE FUNCTIONS *********************************************************/
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VOID
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@ -22,13 +71,161 @@ BOOLEAN
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FsRtlNotifySetCancelRoutine(IN PIRP Irp,
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IN PNOTIFY_CHANGE NotifyChange OPTIONAL);
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/*
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* @implemented
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*/
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VOID
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NTAPI
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FsRtlCancelNotify(IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp)
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{
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PVOID Buffer;
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PIRP NotifyIrp;
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ULONG BufferLength;
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PIO_STACK_LOCATION Stack;
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PNOTIFY_CHANGE NotifyChange;
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PREAL_NOTIFY_SYNC RealNotifySync;
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PSECURITY_SUBJECT_CONTEXT SubjectContext = NULL;
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/* Get the NOTIFY_CHANGE struct and reset it */
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NotifyChange = (PNOTIFY_CHANGE)Irp->IoStatus.Information;
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Irp->IoStatus.Information = 0;
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/* Reset the cancel routine */
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IoSetCancelRoutine(Irp, NULL);
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/* And release lock */
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IoReleaseCancelSpinLock(Irp->CancelIrql);
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UNIMPLEMENTED;
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/* Get REAL_NOTIFY_SYNC struct */
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RealNotifySync = NotifyChange->NotifySync;
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FsRtlNotifyAcquireFastMutex(RealNotifySync);
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_SEH2_TRY
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{
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/* Remove the IRP from the notifications list and mark it pending */
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RemoveEntryList(&(Irp->Tail.Overlay.ListEntry));
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IoMarkIrpPending(Irp);
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/* Now, the tricky part - let's find a buffer big enough to hold the return data */
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if (NotifyChange->Buffer && NotifyChange->AllocatedBuffer == NULL &&
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((Irp->MdlAddress && MmGetSystemAddressForMdl(Irp->MdlAddress) == NotifyChange->Buffer) ||
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NotifyChange->Buffer == Irp->AssociatedIrp.SystemBuffer))
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{
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/* Assume we didn't find any */
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Buffer = NULL;
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BufferLength = 0;
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/* If we don't have IRPs, check if current buffer is big enough */
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if (IsListEmpty(&NotifyChange->NotifyIrps))
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{
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if (NotifyChange->BufferLength >= NotifyChange->DataLength)
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{
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BufferLength = NotifyChange->BufferLength;
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}
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}
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else
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{
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/* Otherwise, try to look at next IRP available */
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NotifyIrp = CONTAINING_RECORD(NotifyChange->NotifyIrps.Flink, IRP, Tail.Overlay.ListEntry);
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Stack = IoGetCurrentIrpStackLocation(NotifyIrp);
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/* If its buffer is big enough, get it */
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if (Stack->Parameters.NotifyDirectory.Length >= NotifyChange->BufferLength)
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{
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/* Is it MDL? */
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if (NotifyIrp->AssociatedIrp.SystemBuffer == NULL)
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{
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if (NotifyIrp->MdlAddress != NULL)
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{
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Buffer = MmGetSystemAddressForMdl(NotifyIrp->MdlAddress);
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}
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}
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else
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{
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Buffer = NotifyIrp->AssociatedIrp.MasterIrp;
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}
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/* Backup our accepted buffer length */
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BufferLength = Stack->Parameters.NotifyDirectory.Length;
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if (BufferLength > NotifyChange->BufferLength)
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{
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BufferLength = NotifyChange->BufferLength;
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}
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}
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}
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/* At that point, we *may* have a buffer */
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/* If it has null length, then note that we won't use it */
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if (BufferLength == 0)
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{
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NotifyChange->Flags |= NOTIFY_IMMEDIATELY;
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}
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else
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{
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/* If we have a buffer length, but no buffer then allocate one */
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if (Buffer == NULL)
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{
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PsChargePoolQuota(NotifyChange->OwningProcess, PagedPool, BufferLength);
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Buffer = ExAllocatePoolWithTag(PagedPool | POOL_RAISE_IF_ALLOCATION_FAILURE, BufferLength, 'NrSF');
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NotifyChange->AllocatedBuffer = Buffer;
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}
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/* Copy data in that buffer */
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RtlCopyMemory(Buffer, NotifyChange->Buffer, NotifyChange->DataLength);
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NotifyChange->ThisBufferLength = BufferLength;
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NotifyChange->Buffer = Buffer;
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}
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/* If we don't have valide buffer, ensure everything is 0-ed out */
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if (NotifyChange->Flags & NOTIFY_IMMEDIATELY)
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{
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NotifyChange->Buffer = 0;
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NotifyChange->AllocatedBuffer = 0;
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NotifyChange->LastEntry = 0;
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NotifyChange->DataLength = 0;
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NotifyChange->ThisBufferLength = 0;
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}
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}
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/* It's now time to complete - data are ready */
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/* Set appropriate status and complete */
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Irp->IoStatus.Status = STATUS_CANCELLED;
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IofCompleteRequest(Irp, EVENT_INCREMENT);
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/* If that notification isn't referenced any longer, drop it */
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if (!InterlockedDecrement((PLONG)&(NotifyChange->ReferenceCount)))
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{
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/* If it had an allocated buffer, delete */
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if (NotifyChange->AllocatedBuffer)
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{
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PsReturnProcessPagedPoolQuota(NotifyChange->OwningProcess, NotifyChange->ThisBufferLength);
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ExFreePoolWithTag(NotifyChange->AllocatedBuffer, 'NrSF');
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}
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/* In case of full name, remember subject context for later deletion */
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if (NotifyChange->FullDirectoryName)
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{
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SubjectContext = NotifyChange->SubjectContext;
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}
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/* We mustn't have ANY change left anymore */
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ASSERT(NotifyChange->NotifyList.Flink == NULL);
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ExFreePoolWithTag(NotifyChange, 0);
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}
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}
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_SEH2_FINALLY
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{
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FsRtlNotifyReleaseFastMutex(RealNotifySync);
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/* If the subject security context was captured, release and free it */
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if (SubjectContext)
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{
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SeReleaseSubjectContext(SubjectContext);
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ExFreePool(SubjectContext);
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}
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}
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_SEH2_END;
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}
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/*
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@ -58,6 +255,9 @@ FsRtlCheckNotifyForDelete(IN PLIST_ENTRY NotifyList,
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}
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}
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/*
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*@implemented
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*/
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PNOTIFY_CHANGE
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FsRtlIsNotifyOnList(IN PLIST_ENTRY NotifyList,
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IN PVOID FsContext)
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@ -83,22 +283,6 @@ FsRtlIsNotifyOnList(IN PLIST_ENTRY NotifyList,
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return NULL;
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}
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FORCEINLINE
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VOID
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FsRtlNotifyAcquireFastMutex(IN PREAL_NOTIFY_SYNC RealNotifySync)
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{
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ULONG_PTR CurrentThread = (ULONG_PTR)KeGetCurrentThread();
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/* Only acquire fast mutex if it's not already acquired by the current thread */
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if (RealNotifySync->OwningThread != CurrentThread)
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{
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ExAcquireFastMutexUnsafe(&(RealNotifySync->FastMutex));
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RealNotifySync->OwningThread = CurrentThread;
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}
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/* Whatever the case, keep trace of the attempt to acquire fast mutex */
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RealNotifySync->OwnerCount++;
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}
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/*
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* @implemented
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*/
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@ -216,7 +400,7 @@ FsRtlNotifyCompleteIrpList(IN PNOTIFY_CHANGE NotifyChange,
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DataLength = NotifyChange->DataLength;
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NotifyChange->Flags &= (INVALIDATE_BUFFERS | WATCH_TREE);
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NotifyChange->Flags &= (NOTIFY_IMMEDIATELY | WATCH_TREE);
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NotifyChange->DataLength = 0;
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NotifyChange->LastEntry = 0;
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@ -233,19 +417,6 @@ FsRtlNotifyCompleteIrpList(IN PNOTIFY_CHANGE NotifyChange,
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}
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}
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FORCEINLINE
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VOID
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FsRtlNotifyReleaseFastMutex(IN PREAL_NOTIFY_SYNC RealNotifySync)
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{
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RealNotifySync->OwnerCount--;
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/* Release the fast mutex only if no other instance needs it */
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if (!RealNotifySync->OwnerCount)
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{
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ExReleaseFastMutexUnsafe(&(RealNotifySync->FastMutex));
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RealNotifySync->OwningThread = (ULONG_PTR)0;
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}
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}
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/*
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* @implemented
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*/
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@ -295,6 +466,91 @@ FsRtlNotifySetCancelRoutine(IN PIRP Irp,
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return FALSE;
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}
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/*
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* @implemented
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*/
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BOOLEAN
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FsRtlNotifyUpdateBuffer(OUT PFILE_NOTIFY_INFORMATION OutputBuffer,
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IN ULONG Action,
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IN PSTRING ParentName,
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IN PSTRING TargetName,
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IN PSTRING StreamName,
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IN BOOLEAN IsUnicode,
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IN ULONG DataLength)
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{
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/* Unless there's an issue with buffers, there's no reason to fail */
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BOOLEAN Succeed = TRUE;
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ULONG AlreadyWritten = 0, ResultSize;
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PAGED_CODE();
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/* Update user buffer with the change that occured
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* First copy parent name if any
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* Then copy target name, there's always one
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* And finally, copy stream name if any
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* If these names aren't unicode, then convert first
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*/
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_SEH2_TRY
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{
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OutputBuffer->NextEntryOffset = 0;
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OutputBuffer->Action = Action;
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OutputBuffer->FileNameLength = DataLength - sizeof(FILE_NOTIFY_INFORMATION);
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if (IsUnicode)
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{
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if (ParentName->Length)
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{
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RtlCopyMemory(OutputBuffer->FileName, ParentName->Buffer, ParentName->Length);
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OutputBuffer->FileName[ParentName->Length / sizeof(WCHAR)] = L'\\';
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AlreadyWritten = ParentName->Length + sizeof(WCHAR);
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}
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RtlCopyMemory(OutputBuffer->FileName + AlreadyWritten, TargetName->Buffer, TargetName->Length);
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if (StreamName)
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{
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AlreadyWritten += TargetName->Length;
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OutputBuffer->FileName[AlreadyWritten / sizeof(WCHAR)] = L':';
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RtlCopyMemory(OutputBuffer->FileName + AlreadyWritten + sizeof(WCHAR),
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StreamName->Buffer, StreamName->Length);
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}
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}
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else
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{
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if (!ParentName->Length)
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{
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ASSERT(StreamName);
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RtlCopyMemory(OutputBuffer->FileName, StreamName->Buffer, StreamName->Length);
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}
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else
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{
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RtlOemToUnicodeN(OutputBuffer->FileName, OutputBuffer->FileNameLength,
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&ResultSize, ParentName->Buffer,
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ParentName->Length);
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OutputBuffer->FileName[ResultSize / sizeof(WCHAR)] = L'\\';
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AlreadyWritten = ResultSize + sizeof(WCHAR);
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RtlOemToUnicodeN(OutputBuffer->FileName + AlreadyWritten,
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OutputBuffer->FileNameLength, &ResultSize,
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TargetName->Buffer, TargetName->Length);
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if (StreamName)
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{
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AlreadyWritten += ResultSize;
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OutputBuffer->FileName[AlreadyWritten / sizeof(WCHAR)] = L':';
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RtlOemToUnicodeN(OutputBuffer->FileName + AlreadyWritten + sizeof(WCHAR),
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OutputBuffer->FileNameLength, &ResultSize,
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StreamName->Buffer, StreamName->Length);
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}
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}
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}
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}
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_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
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{
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Succeed = FALSE;
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}
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_SEH2_END;
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return Succeed;
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}
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/* PUBLIC FUNCTIONS **********************************************************/
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/*++
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@ -445,7 +701,7 @@ FsRtlNotifyCleanup(IN PNOTIFY_SYNC NotifySync,
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/*++
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* @name FsRtlNotifyFilterChangeDirectory
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* @unimplemented
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* @implemented
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*
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* FILLME
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*
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@ -559,16 +815,16 @@ FsRtlNotifyFilterChangeDirectory(IN PNOTIFY_SYNC NotifySync,
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NotifyIrp->IoStatus.Status = STATUS_DELETE_PENDING;
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IoCompleteRequest(NotifyIrp, EVENT_INCREMENT);
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}
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/* Complete if there is directory enumeration and no buffer available any more */
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if ((NotifyChange->Flags & INVALIDATE_BUFFERS) && (NotifyChange->Flags & ENUMERATE_DIR))
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/* Complete now if asked to (and not asked to notify later on) */
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if ((NotifyChange->Flags & NOTIFY_IMMEDIATELY) && !(NotifyChange->Flags & NOTIFY_LATER))
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{
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NotifyChange->Flags &= ~INVALIDATE_BUFFERS;
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NotifyChange->Flags &= ~NOTIFY_IMMEDIATELY;
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IoMarkIrpPending(NotifyIrp);
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NotifyIrp->IoStatus.Status = STATUS_NOTIFY_ENUM_DIR;
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IoCompleteRequest(NotifyIrp, EVENT_INCREMENT);
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}
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/* If no data yet, or directory enumeration, handle */
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else if (NotifyChange->DataLength == 0 || (NotifyChange->Flags & ENUMERATE_DIR))
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/* If no data yet, or asked to notify later on, handle */
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else if (NotifyChange->DataLength == 0 || (NotifyChange->Flags & NOTIFY_LATER))
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{
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goto HandleIRP;
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}
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@ -612,20 +868,13 @@ FsRtlNotifyFilterChangeDirectory(IN PNOTIFY_SYNC NotifySync,
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else
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{
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/* If it can't contain WCHAR, it's ANSI */
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if (FullDirectoryName->Length < sizeof(WCHAR))
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if (FullDirectoryName->Length < sizeof(WCHAR) || ((CHAR*)FullDirectoryName->Buffer)[1] != 0)
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{
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NotifyChange->CharacterSize = sizeof(CHAR);
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}
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/* First char is \, so in unicode, right part is 0
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* whereas in ANSI it contains next char
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*/
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else if (((CHAR*)FullDirectoryName->Buffer)[1] == 0)
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{
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NotifyChange->CharacterSize = sizeof(WCHAR);
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}
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else
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{
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NotifyChange->CharacterSize = sizeof(CHAR);
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NotifyChange->CharacterSize = sizeof(WCHAR);
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}
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/* Now, check is user is willing to watch root */
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@ -668,7 +917,7 @@ HandleIRP:
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FsRtlNotifyReleaseFastMutex(RealNotifySync);
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/* If the subject security context was captured and there's no notify */
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if (SubjectContext && (!NotifyChange || FullDirectoryName))
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if (SubjectContext && (!NotifyChange || NotifyChange->FullDirectoryName))
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{
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SeReleaseSubjectContext(SubjectContext);
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ExFreePool(SubjectContext);
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@ -679,7 +928,7 @@ HandleIRP:
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/*++
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* @name FsRtlNotifyFilterReportChange
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* @unimplemented
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* @implemented
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*
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* FILLME
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*
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@ -731,7 +980,437 @@ FsRtlNotifyFilterReportChange(IN PNOTIFY_SYNC NotifySync,
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IN PVOID TargetContext,
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IN PVOID FilterContext)
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{
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KeBugCheck(FILE_SYSTEM);
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PIRP Irp;
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PVOID OutputBuffer;
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USHORT FullPosition;
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PLIST_ENTRY NextEntry;
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PIO_STACK_LOCATION Stack;
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PNOTIFY_CHANGE NotifyChange;
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PREAL_NOTIFY_SYNC RealNotifySync;
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PFILE_NOTIFY_INFORMATION FileNotifyInfo;
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BOOLEAN IsStream, IsParent, PoolQuotaCharged;
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STRING TargetDirectory, TargetName, ParentName, IntNormalizedParentName;
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ULONG NumberOfBytes, TargetNumberOfParts, FullNumberOfParts, LastPartOffset, ParentNameOffset, ParentNameLength;
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ULONG DataLength, TargetNameLength, AlignedDataLength;
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TargetDirectory.Length = 0;
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TargetDirectory.MaximumLength = 0;
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TargetDirectory.Buffer = NULL;
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TargetName.Length = 0;
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TargetName.MaximumLength = 0;
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TargetName.Buffer = NULL;
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ParentName.Length = 0;
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ParentName.MaximumLength = 0;
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ParentName.Buffer = NULL;
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IsStream = FALSE;
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PAGED_CODE();
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|
||||
DPRINT("FsRtlNotifyFilterReportChange(%p, %p, %p, %u, %p, %p, %p, %x, %x, %p, %p)\n",
|
||||
NotifySync, NotifyList, FullTargetName, TargetNameOffset, StreamName, NormalizedParentName,
|
||||
FilterMatch, Action, TargetContext, FilterContext);
|
||||
|
||||
/* We need offset in name */
|
||||
if (!TargetNameOffset && FullTargetName)
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
/* Get real structure hidden behind the opaque pointer */
|
||||
RealNotifySync = (PREAL_NOTIFY_SYNC)NotifySync;
|
||||
/* Acquire lock - will be released in finally block */
|
||||
FsRtlNotifyAcquireFastMutex(RealNotifySync);
|
||||
_SEH2_TRY
|
||||
{
|
||||
/* Browse all the registered notifications we have */
|
||||
for (NextEntry = NotifyList->Flink; NextEntry != NotifyList;
|
||||
NextEntry = NextEntry->Flink)
|
||||
{
|
||||
/* Try to find an entry matching our change */
|
||||
NotifyChange = CONTAINING_RECORD(NextEntry, NOTIFY_CHANGE, NotifyList);
|
||||
if (FullTargetName != NULL)
|
||||
{
|
||||
ASSERT(NotifyChange->FullDirectoryName != NULL);
|
||||
if (!NotifyChange->FullDirectoryName->Length)
|
||||
{
|
||||
continue;
|
||||
}
|
||||
|
||||
if (!(FilterMatch & NotifyChange->CompletionFilter))
|
||||
{
|
||||
continue;
|
||||
}
|
||||
|
||||
/* If no normalized name provided, construct it from full target name */
|
||||
if (NormalizedParentName == NULL)
|
||||
{
|
||||
IntNormalizedParentName.Buffer = FullTargetName->Buffer;
|
||||
if (TargetNameOffset != NotifyChange->CharacterSize)
|
||||
{
|
||||
IntNormalizedParentName.MaximumLength =
|
||||
IntNormalizedParentName.Length = TargetNameOffset - NotifyChange->CharacterSize;
|
||||
}
|
||||
else
|
||||
{
|
||||
IntNormalizedParentName.MaximumLength =
|
||||
IntNormalizedParentName.Length = TargetNameOffset;
|
||||
}
|
||||
NormalizedParentName = &IntNormalizedParentName;
|
||||
}
|
||||
|
||||
/* heh? Watched directory bigger than changed file? */
|
||||
if (NormalizedParentName->Length < NotifyChange->FullDirectoryName->Length)
|
||||
{
|
||||
continue;
|
||||
}
|
||||
|
||||
/* Same len => parent */
|
||||
if (NormalizedParentName->Length == NotifyChange->FullDirectoryName->Length)
|
||||
{
|
||||
IsParent = TRUE;
|
||||
}
|
||||
/* If not, then, we have to be watching the tree, otherwise we don't have to report such changes */
|
||||
else if (!(NotifyChange->Flags & WATCH_TREE))
|
||||
{
|
||||
continue;
|
||||
}
|
||||
/* And finally, we've to check we're properly \-terminated */
|
||||
else
|
||||
{
|
||||
if (!(NotifyChange->Flags & WATCH_ROOT))
|
||||
{
|
||||
if (NotifyChange->CharacterSize == sizeof(CHAR))
|
||||
{
|
||||
if (((PSTR)NormalizedParentName->Buffer)[NotifyChange->FullDirectoryName->Length] != '\\')
|
||||
{
|
||||
continue;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
if (((PWSTR)NormalizedParentName->Buffer)[NotifyChange->FullDirectoryName->Length / sizeof (WCHAR)] != L'\\')
|
||||
{
|
||||
continue;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
IsParent = FALSE;
|
||||
}
|
||||
|
||||
/* If len matches, then check that both name are equal */
|
||||
if (!RtlEqualMemory(NormalizedParentName->Buffer, NotifyChange->FullDirectoryName->Buffer,
|
||||
NotifyChange->FullDirectoryName->Length))
|
||||
{
|
||||
continue;
|
||||
}
|
||||
|
||||
/* Call traverse callback (only if we have to traverse ;-)) */
|
||||
if (!IsParent
|
||||
&& NotifyChange->TraverseCallback != NULL
|
||||
&& !NotifyChange->TraverseCallback(NotifyChange->FsContext,
|
||||
TargetContext,
|
||||
NotifyChange->SubjectContext))
|
||||
{
|
||||
continue;
|
||||
}
|
||||
|
||||
/* And then, filter callback if provided */
|
||||
if (NotifyChange->FilterCallback != NULL
|
||||
&& FilterContext != NULL
|
||||
&& !NotifyChange->FilterCallback(NotifyChange->FsContext, FilterContext))
|
||||
{
|
||||
continue;
|
||||
}
|
||||
}
|
||||
/* We have a stream! */
|
||||
else
|
||||
{
|
||||
ASSERT(NotifyChange->FullDirectoryName == NULL);
|
||||
if (TargetContext != NotifyChange->SubjectContext)
|
||||
{
|
||||
continue;
|
||||
}
|
||||
|
||||
ParentName.Buffer = NULL;
|
||||
ParentName.Length = 0;
|
||||
IsStream = TRUE;
|
||||
IsParent = FALSE;
|
||||
}
|
||||
|
||||
/* If we don't have to notify immediately, prepare for output */
|
||||
if (!(NotifyChange->Flags & NOTIFY_IMMEDIATELY))
|
||||
{
|
||||
/* If we have something to output... */
|
||||
if (NotifyChange->BufferLength)
|
||||
{
|
||||
/* Get size of the output */
|
||||
NumberOfBytes = 0;
|
||||
Irp = NULL;
|
||||
if (!NotifyChange->ThisBufferLength)
|
||||
{
|
||||
if (IsListEmpty(&NotifyChange->NotifyIrps))
|
||||
{
|
||||
NumberOfBytes = NotifyChange->BufferLength;
|
||||
}
|
||||
else
|
||||
{
|
||||
Irp = CONTAINING_RECORD(NotifyChange->NotifyIrps.Flink, IRP, Tail.Overlay.ListEntry);
|
||||
Stack = IoGetCurrentIrpStackLocation(Irp);
|
||||
NumberOfBytes = Stack->Parameters.NotifyDirectory.Length;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
NumberOfBytes = NotifyChange->ThisBufferLength;
|
||||
}
|
||||
|
||||
/* If we're matching parent, we don't care about parent (redundant) */
|
||||
if (IsParent)
|
||||
{
|
||||
ParentName.Length = 0;
|
||||
}
|
||||
else
|
||||
{
|
||||
/* If we don't deal with streams, some more work is required */
|
||||
if (!IsStream)
|
||||
{
|
||||
if (NotifyChange->Flags & WATCH_ROOT ||
|
||||
(NormalizedParentName->Buffer != FullTargetName->Buffer))
|
||||
{
|
||||
/* Construct TargetDirectory if we don't have it yet */
|
||||
if (TargetDirectory.Buffer == NULL)
|
||||
{
|
||||
TargetDirectory.Buffer = FullTargetName->Buffer;
|
||||
TargetDirectory.Length = TargetNameOffset;
|
||||
if (TargetNameOffset != NotifyChange->CharacterSize)
|
||||
{
|
||||
TargetDirectory.Length = TargetNameOffset - NotifyChange->CharacterSize;
|
||||
}
|
||||
TargetDirectory.MaximumLength = TargetDirectory.Length;
|
||||
}
|
||||
/* Now, we start looking for matching parts (unless we watch root) */
|
||||
TargetNumberOfParts = 0;
|
||||
if (!(NotifyChange->Flags & WATCH_ROOT))
|
||||
{
|
||||
FullNumberOfParts = 1;
|
||||
if (NotifyChange->CharacterSize == sizeof(CHAR))
|
||||
{
|
||||
FsRtlNotifyGetLastPartOffset(NotifyChange->FullDirectoryName->Length,
|
||||
TargetDirectory.Length, PSTR, '\\');
|
||||
}
|
||||
else
|
||||
{
|
||||
FsRtlNotifyGetLastPartOffset(NotifyChange->FullDirectoryName->Length / sizeof(WCHAR),
|
||||
TargetDirectory.Length / sizeof(WCHAR), PWSTR, L'\\');
|
||||
LastPartOffset *= NotifyChange->CharacterSize;
|
||||
}
|
||||
}
|
||||
|
||||
/* Then, we can construct proper parent name */
|
||||
ParentNameOffset = NotifyChange->CharacterSize + LastPartOffset;
|
||||
ParentName.Buffer = &TargetDirectory.Buffer[ParentNameOffset];
|
||||
ParentNameLength = TargetDirectory.Length;
|
||||
}
|
||||
else
|
||||
{
|
||||
/* Construct parent name even for streams */
|
||||
ParentName.Buffer = &NormalizedParentName->Buffer[NotifyChange->FullDirectoryName->Length] + NotifyChange->CharacterSize;
|
||||
ParentNameLength = NormalizedParentName->Length - NotifyChange->FullDirectoryName->Length;
|
||||
ParentNameOffset = NotifyChange->CharacterSize;
|
||||
}
|
||||
ParentNameLength -= ParentNameOffset;
|
||||
ParentName.Length = ParentNameLength;
|
||||
ParentName.MaximumLength = ParentNameLength;
|
||||
}
|
||||
}
|
||||
|
||||
/* Start to count amount of data to write, we've first the structure itself */
|
||||
DataLength = FIELD_OFFSET(FILE_NOTIFY_INFORMATION, FileName);
|
||||
|
||||
/* If stream, we'll just append stream name */
|
||||
if (IsStream)
|
||||
{
|
||||
ASSERT(StreamName != NULL);
|
||||
DataLength += StreamName->Length;
|
||||
}
|
||||
else
|
||||
{
|
||||
/* If not parent, we've to append parent name */
|
||||
if (!IsParent)
|
||||
{
|
||||
if (NotifyChange->CharacterSize == sizeof(CHAR))
|
||||
{
|
||||
DataLength += RtlOemStringToCountedUnicodeSize(&ParentName);
|
||||
}
|
||||
else
|
||||
{
|
||||
DataLength += ParentName.Length;
|
||||
}
|
||||
DataLength += sizeof(WCHAR);
|
||||
}
|
||||
|
||||
/* Look for target name & construct it, if required */
|
||||
if (TargetName.Buffer)
|
||||
{
|
||||
TargetNameLength = TargetName.Length;
|
||||
}
|
||||
else
|
||||
{
|
||||
TargetName.Buffer = &FullTargetName->Buffer[TargetNameOffset];
|
||||
TargetNameLength = FullTargetName->Length - TargetNameOffset;
|
||||
TargetName.Length = TargetNameLength;
|
||||
TargetName.MaximumLength = TargetNameLength;
|
||||
}
|
||||
|
||||
/* Then, we will append it as well */
|
||||
if (NotifyChange->CharacterSize == sizeof(CHAR))
|
||||
{
|
||||
DataLength += RtlOemStringToCountedUnicodeSize(&TargetName);
|
||||
}
|
||||
else
|
||||
{
|
||||
DataLength += TargetName.Length;
|
||||
}
|
||||
|
||||
/* If we also had a stream name, then we can append it as well */
|
||||
if (StreamName != NULL)
|
||||
{
|
||||
if (NotifyChange->CharacterSize == sizeof(WCHAR))
|
||||
{
|
||||
DataLength += StreamName->Length + sizeof(WCHAR);
|
||||
}
|
||||
else
|
||||
{
|
||||
DataLength = DataLength + RtlOemStringToCountedUnicodeSize(&TargetName) + sizeof(CHAR);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* Get the position where we can put our data (aligned!) */
|
||||
AlignedDataLength = ROUND_UP(NotifyChange->DataLength, sizeof(ULONG));
|
||||
/* If it's higher than buffer length, then, bail out without outputing */
|
||||
if (DataLength > NumberOfBytes || AlignedDataLength + DataLength > NumberOfBytes)
|
||||
{
|
||||
NotifyChange->Flags |= NOTIFY_IMMEDIATELY;
|
||||
}
|
||||
else
|
||||
{
|
||||
OutputBuffer = 0;
|
||||
FileNotifyInfo = 0;
|
||||
/* If we already had a buffer, update last entry position */
|
||||
if (NotifyChange->Buffer != NULL)
|
||||
{
|
||||
FileNotifyInfo = (PVOID)((ULONG_PTR)NotifyChange->Buffer + NotifyChange->LastEntry);
|
||||
FileNotifyInfo->NextEntryOffset = AlignedDataLength - NotifyChange->LastEntry;
|
||||
NotifyChange->LastEntry = AlignedDataLength;
|
||||
/* And get our output buffer */
|
||||
OutputBuffer = (PVOID)((ULONG_PTR)NotifyChange->Buffer + AlignedDataLength);
|
||||
}
|
||||
/* If we hadn't buffer, try to find one */
|
||||
else if (Irp != NULL)
|
||||
{
|
||||
if (Irp->AssociatedIrp.SystemBuffer != NULL)
|
||||
{
|
||||
OutputBuffer = Irp->AssociatedIrp.SystemBuffer;
|
||||
}
|
||||
else if (Irp->MdlAddress != NULL)
|
||||
{
|
||||
OutputBuffer = MmGetSystemAddressForMdl(Irp->MdlAddress);
|
||||
}
|
||||
|
||||
NotifyChange->Buffer = OutputBuffer;
|
||||
NotifyChange->ThisBufferLength = NumberOfBytes;
|
||||
}
|
||||
|
||||
/* If we couldn't find one, then allocate one */
|
||||
if (NotifyChange->Buffer == NULL)
|
||||
{
|
||||
PoolQuotaCharged = FALSE;
|
||||
_SEH2_TRY
|
||||
{
|
||||
PsChargePoolQuota(NotifyChange->OwningProcess, PagedPool, NumberOfBytes);
|
||||
PoolQuotaCharged = TRUE;
|
||||
OutputBuffer = ExAllocatePoolWithTag(PagedPool | POOL_RAISE_IF_ALLOCATION_FAILURE,
|
||||
NumberOfBytes, 'NrSF');
|
||||
NotifyChange->Buffer = OutputBuffer;
|
||||
NotifyChange->AllocatedBuffer = OutputBuffer;
|
||||
}
|
||||
/* If something went wrong during allocation, notify immediately instead of outputing */
|
||||
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
|
||||
{
|
||||
if (PoolQuotaCharged)
|
||||
{
|
||||
PsReturnProcessPagedPoolQuota(NotifyChange->OwningProcess, NumberOfBytes);
|
||||
}
|
||||
NotifyChange->Flags |= NOTIFY_IMMEDIATELY;
|
||||
}
|
||||
_SEH2_END;
|
||||
}
|
||||
|
||||
/* Finally, if we have a buffer, fill it in! */
|
||||
if (OutputBuffer != NULL)
|
||||
{
|
||||
if (FsRtlNotifyUpdateBuffer((FILE_NOTIFY_INFORMATION *)OutputBuffer,
|
||||
Action, &ParentName, &TargetName,
|
||||
StreamName, NotifyChange->CharacterSize == sizeof(WCHAR),
|
||||
DataLength))
|
||||
{
|
||||
NotifyChange->DataLength = DataLength + AlignedDataLength;
|
||||
}
|
||||
/* If it failed, notify immediately */
|
||||
else
|
||||
{
|
||||
NotifyChange->Flags |= NOTIFY_IMMEDIATELY;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* If we have to notify right now (something went wrong?) */
|
||||
if (NotifyChange->Flags & NOTIFY_IMMEDIATELY)
|
||||
{
|
||||
/* Ensure that all our buffers are NULL */
|
||||
if (NotifyChange->Buffer != NULL)
|
||||
{
|
||||
if (NotifyChange->AllocatedBuffer != NULL)
|
||||
{
|
||||
PsReturnProcessPagedPoolQuota(NotifyChange->OwningProcess, NotifyChange->ThisBufferLength);
|
||||
ExFreePoolWithTag(NotifyChange->AllocatedBuffer, 'NrSF');
|
||||
}
|
||||
|
||||
NotifyChange->Buffer = NULL;
|
||||
NotifyChange->AllocatedBuffer = NULL;
|
||||
NotifyChange->LastEntry = 0;
|
||||
NotifyChange->DataLength = 0;
|
||||
NotifyChange->ThisBufferLength = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* If asking for old name in case of a rename, notify later on,
|
||||
* so that we can wait for new name.
|
||||
* http://msdn.microsoft.com/en-us/library/dn392331.aspx
|
||||
*/
|
||||
if (Action == FILE_ACTION_RENAMED_OLD_NAME)
|
||||
{
|
||||
NotifyChange->Flags |= NOTIFY_LATER;
|
||||
}
|
||||
else
|
||||
{
|
||||
NotifyChange->Flags &= ~NOTIFY_LATER;
|
||||
if (!IsListEmpty(&NotifyChange->NotifyIrps))
|
||||
{
|
||||
FsRtlNotifyCompleteIrpList(NotifyChange, STATUS_SUCCESS);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
_SEH2_FINALLY
|
||||
{
|
||||
FsRtlNotifyReleaseFastMutex(RealNotifySync);
|
||||
}
|
||||
_SEH2_END;
|
||||
}
|
||||
|
||||
/*++
|
||||
|
|
|
|||
|
|
@ -53,9 +53,9 @@
|
|||
// Notifications flags
|
||||
//
|
||||
#define WATCH_TREE 0x01
|
||||
#define INVALIDATE_BUFFERS 0x02
|
||||
#define NOTIFY_IMMEDIATELY 0x02
|
||||
#define CLEANUP_IN_PROCESS 0x04
|
||||
#define ENUMERATE_DIR 0x08
|
||||
#define NOTIFY_LATER 0x08
|
||||
#define WATCH_ROOT 0x10
|
||||
#define DELETE_IN_PROCESS 0x20
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue