[ion] 22791: - NtQueryDirectoryFile: - Setup a buffer/MDL and the correct IRP flags so that that I/O manager can handle allocation, copy, free for us. - Setup the search pattern as an auxiliary buffer so that the I/O Mgr can track that one for us as well. - Update to use the correct sync semantics/routines. - Use deferred I/O completion. - Outline TODOs and workplan for iofunc.c
3 Jul
2006
3 Jul
'06
2:50 a.m.
Author: ion
Date: Mon Jul 3 06:50:16 2006
New Revision: 22791
URL: http://svn.reactos.org/svn/reactos?rev=22791&view=rev
Log:
- NtQueryDirectoryFile:
- Setup a buffer/MDL and the correct IRP flags so that that I/O manager can handle
allocation, copy, free for us.
- Setup the search pattern as an auxiliary buffer so that the I/O Mgr can track that one
for us as well.
- Update to use the correct sync semantics/routines.
- Use deferred I/O completion.
- Outline TODOs and workplan for iofunc.c
Modified:
trunk/reactos/ntoskrnl/io/iomgr/iofunc.c
Modified: trunk/reactos/ntoskrnl/io/iomgr/iofunc.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/io/iomgr/iofunc.c…
==============================================================================
--- trunk/reactos/ntoskrnl/io/iomgr/iofunc.c (original)
+++ trunk/reactos/ntoskrnl/io/iomgr/iofunc.c Mon Jul 3 06:50:16 2006
@@ -24,11 +24,17 @@
///
//
// TODO:
+// - Update to new semantics:
// - Lock/Unlock <= DONE
// - Query/Set Volume Info <= DONE
// - Read/Write file <= DONE
+// - QueryDirectoryFile <= DONE
// - Query/Set File Info
-// - QueryDirectoryFile
+// - Add SEH to some places where it's missing (MDLs, etc)
+// - Add a generic Cleanup/Exception Routine
+// - Add another parameter to IopCleanupFailedIrp
+// - Add support for Fast Dispatch I/O
+// - Add support for some fast-paths when querying/setting data
//
///
@@ -533,16 +539,6 @@
/* Return the Length and Status. ReturnedLength is NOT optional */
*ReturnedLength = IoStatusBlock.Information;
return Status;
-}
-
-NTSTATUS
-NTAPI
-IopQueryDirectoryFileCompletion(IN PDEVICE_OBJECT DeviceObject,
- IN PIRP Irp,
- IN PVOID Context)
-{
- ExFreePool(Context);
- return STATUS_SUCCESS;
}
/* PUBLIC FUNCTIONS **********************************************************/
@@ -1273,7 +1269,7 @@
NTSTATUS
NTAPI
NtQueryDirectoryFile(IN HANDLE FileHandle,
- IN HANDLE PEvent OPTIONAL,
+ IN HANDLE EventHandle OPTIONAL,
IN PIO_APC_ROUTINE ApcRoutine OPTIONAL,
IN PVOID ApcContext OPTIONAL,
OUT PIO_STATUS_BLOCK IoStatusBlock,
@@ -1286,55 +1282,73 @@
{
PIRP Irp;
PDEVICE_OBJECT DeviceObject;
- PFILE_OBJECT FileObject = NULL;
+ PFILE_OBJECT FileObject;
PIO_STACK_LOCATION StackPtr;
KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
NTSTATUS Status = STATUS_SUCCESS;
- BOOLEAN LocalEvent = FALSE;
+ BOOLEAN LockedForSynch = FALSE;
PKEVENT Event = NULL;
- PUNICODE_STRING SearchPattern = NULL;
+ PVOID AuxBuffer = NULL;
+ PMDL Mdl;
+ UNICODE_STRING CapturedFileName;
+ PUNICODE_STRING SearchPattern;
PAGED_CODE();
- /* Validate User-Mode Buffers */
+ /* Check if we came from user mode */
if(PreviousMode != KernelMode)
{
+ /* Enter SEH for probing */
_SEH_TRY
{
+ /* Probe the I/O Status Block */
ProbeForWrite(IoStatusBlock,
sizeof(IO_STATUS_BLOCK),
sizeof(ULONG));
- ProbeForWrite(FileInformation,
- Length,
- sizeof(ULONG));
+
+ /* Probe the file information */
+ ProbeForWrite(FileInformation, Length, sizeof(ULONG));
+
+ /* Check if we have a file name */
if (FileName)
{
- UNICODE_STRING CapturedFileName;
-
+ /* Capture it */
CapturedFileName = ProbeForReadUnicodeString(FileName);
- ProbeForRead(CapturedFileName.Buffer,
- CapturedFileName.MaximumLength,
- 1);
- SearchPattern = ExAllocatePool(NonPagedPool, CapturedFileName.Length +
sizeof(WCHAR) + sizeof(UNICODE_STRING));
- if (SearchPattern == NULL)
+ if (CapturedFileName.Length)
{
- Status = STATUS_INSUFFICIENT_RESOURCES;
- _SEH_LEAVE;
+ /* Probe its buffer */
+ ProbeForRead(CapturedFileName.Buffer,
+ CapturedFileName.Length,
+ 1);
}
- SearchPattern->Buffer = (PWCHAR)((ULONG_PTR)SearchPattern +
sizeof(UNICODE_STRING));
- SearchPattern->MaximumLength = CapturedFileName.Length +
sizeof(WCHAR);
- RtlCopyUnicodeString(SearchPattern, &CapturedFileName);
+
+ /* Allocate the auxiliary buffer */
+ AuxBuffer = ExAllocatePoolWithTag(NonPagedPool,
+ CapturedFileName.Length +
+ sizeof(UNICODE_STRING),
+ TAG_SYSB);
+ RtlCopyMemory((PVOID)((ULONG_PTR)AuxBuffer +
+ sizeof(UNICODE_STRING)),
+ CapturedFileName.Buffer,
+ CapturedFileName.Length);
+
+ /* Setup the search pattern */
+ SearchPattern = (PUNICODE_STRING)AuxBuffer;
+ SearchPattern->Buffer = (PWCHAR)((ULONG_PTR)AuxBuffer +
+ sizeof(UNICODE_STRING));
+ SearchPattern->Length = CapturedFileName.Length;
+ SearchPattern->MaximumLength = CapturedFileName.Length;
}
}
_SEH_HANDLE
{
+ /* Get exception code and free the buffer */
+ if (AuxBuffer) ExFreePool(AuxBuffer);
Status = _SEH_GetExceptionCode();
}
_SEH_END;
- if(!NT_SUCCESS(Status))
- {
- goto Cleanup;
- }
+ /* Return status on failure */
+ if (!NT_SUCCESS(Status)) return Status;
}
/* Get File Object */
@@ -1344,53 +1358,53 @@
PreviousMode,
(PVOID *)&FileObject,
NULL);
- if (!NT_SUCCESS(Status)) goto Cleanup;
-
- /* Get Event Object */
- if (PEvent)
- {
- Status = ObReferenceObjectByHandle(PEvent,
+ if (!NT_SUCCESS(Status))
+ {
+ /* Fail */
+ if (AuxBuffer) ExFreePool(AuxBuffer);
+ return Status;
+ }
+
+ /* Check if we have an even handle */
+ if (EventHandle)
+ {
+ /* Get its pointer */
+ Status = ObReferenceObjectByHandle(EventHandle,
EVENT_MODIFY_STATE,
ExEventObjectType,
PreviousMode,
(PVOID *)&Event,
NULL);
- if (!NT_SUCCESS(Status))
- {
- goto Cleanup;
- }
-
+ if (!NT_SUCCESS(Status))
+ {
+ /* Fail */
+ ObDereferenceObject(FileObject);
+ return Status;
+ }
+
+ /* Clear it */
KeClearEvent(Event);
}
- /* Check if this is a direct open or not */
- if (FileObject->Flags & FO_DIRECT_DEVICE_OPEN)
- {
- DeviceObject = IoGetAttachedDevice(FileObject->DeviceObject);
- }
- else
- {
- DeviceObject = IoGetRelatedDeviceObject(FileObject);
- }
-
- /* Check if we should use Sync IO or not */
+ /* Check if this is a file that was opened for Synch I/O */
if (FileObject->Flags & FO_SYNCHRONOUS_IO)
{
- /* Use File Object event */
- KeClearEvent(&FileObject->Event);
- }
- else
- {
- LocalEvent = TRUE;
- }
+ /* Lock it */
+ IopLockFileObject(FileObject);
+
+ /* Remember to unlock later */
+ LockedForSynch = TRUE;
+ }
+
+ /* Get the device object */
+ DeviceObject = IoGetRelatedDeviceObject(FileObject);
+
+ /* Clear the File Object's event */
+ KeClearEvent(&FileObject->Event);
/* Allocate the IRP */
- Irp = IoAllocateIrp(DeviceObject->StackSize, FALSE);
- if (!Irp)
- {
- Status = STATUS_INSUFFICIENT_RESOURCES;
- goto Cleanup;
- }
+ Irp = IoAllocateIrp(DeviceObject->StackSize, TRUE);
+ if (!Irp) return IopCleanupFailedIrp(FileObject, EventHandle);
/* Set up the IRP */
Irp->RequestorMode = PreviousMode;
@@ -1398,9 +1412,38 @@
Irp->UserEvent = Event;
Irp->Tail.Overlay.Thread = PsGetCurrentThread();
Irp->Tail.Overlay.OriginalFileObject = FileObject;
- Irp->UserBuffer = FileInformation;
Irp->Overlay.AsynchronousParameters.UserApcRoutine = ApcRoutine;
Irp->Overlay.AsynchronousParameters.UserApcContext = ApcContext;
+ Irp->MdlAddress = NULL;
+ Irp->Tail.Overlay.AuxiliaryBuffer = AuxBuffer;
+ Irp->AssociatedIrp.SystemBuffer = NULL;
+
+ /* Check if this is buffered I/O */
+ if (DeviceObject->Flags & DO_BUFFERED_IO)
+ {
+ /* Allocate a buffer */
+ Irp->AssociatedIrp.SystemBuffer =
+ ExAllocatePoolWithTag(NonPagedPool,
+ Length,
+ TAG_SYSB);
+
+ /* Set the buffer and flags */
+ Irp->UserBuffer = FileInformation;
+ Irp->Flags = (IRP_BUFFERED_IO |
+ IRP_DEALLOCATE_BUFFER |
+ IRP_INPUT_OPERATION);
+ }
+ else if (DeviceObject->Flags & DO_DIRECT_IO)
+ {
+ /* Allocate an MDL */
+ Mdl = IoAllocateMdl(FileInformation, Length, FALSE, TRUE, Irp);
+ MmProbeAndLockPages(Mdl, PreviousMode, IoWriteAccess);
+ }
+ else
+ {
+ /* No allocation flags, and use the buffer directly */
+ Irp->UserBuffer = FileInformation;
+ }
/* Set up Stack Data */
StackPtr = IoGetNextIrpStackLocation(Irp);
@@ -1409,48 +1452,26 @@
StackPtr->MinorFunction = IRP_MN_QUERY_DIRECTORY;
/* Set Parameters */
- StackPtr->Parameters.QueryDirectory.FileInformationClass = FileInformationClass;
- StackPtr->Parameters.QueryDirectory.FileName = SearchPattern ? SearchPattern :
FileName;
+ StackPtr->Parameters.QueryDirectory.FileInformationClass =
+ FileInformationClass;
+ StackPtr->Parameters.QueryDirectory.FileName = AuxBuffer;
StackPtr->Parameters.QueryDirectory.FileIndex = 0;
StackPtr->Parameters.QueryDirectory.Length = Length;
StackPtr->Flags = 0;
if (RestartScan) StackPtr->Flags = SL_RESTART_SCAN;
if (ReturnSingleEntry) StackPtr->Flags |= SL_RETURN_SINGLE_ENTRY;
- if (SearchPattern)
- {
- IoSetCompletionRoutine(Irp,
- IopQueryDirectoryFileCompletion,
- SearchPattern,
- TRUE,
- TRUE,
- TRUE);
- }
-
- /* Call the Driver */
- Status = IoCallDriver(DeviceObject, Irp);
- if (Status == STATUS_PENDING)
- {
- if (!LocalEvent)
- {
- KeWaitForSingleObject(&FileObject->Event,
- Executive,
- PreviousMode,
- FileObject->Flags & FO_ALERTABLE_IO,
- NULL);
- Status = FileObject->FinalStatus;
- }
- }
-
- return Status;
-
-Cleanup:
- if (FileObject) ObDereferenceObject(FileObject);
- if (Event) ObDereferenceObject(Event);
- if (SearchPattern) ExFreePool(SearchPattern);
-
- /* Return the Status */
- return Status;
+ /* Set deferred I/O */
+ Irp->Flags |= IRP_DEFER_IO_COMPLETION;
+
+ /* Perform the call */
+ return IopPerformSynchronousRequest(DeviceObject,
+ Irp,
+ FileObject,
+ TRUE,
+ PreviousMode,
+ LockedForSynch,
+ IopOtherTransfer);
}
/*
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