mirror of
https://github.com/reactos/reactos.git
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238 lines
6.2 KiB
C
238 lines
6.2 KiB
C
/*
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* PROJECT: ReactOS Named Pipe FileSystem
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* LICENSE: BSD - See COPYING.ARM in the top level directory
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* FILE: drivers/filesystems/npfs/read.c
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* PURPOSE: Pipes Reading
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* PROGRAMMERS: ReactOS Portable Systems Group
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*/
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/* INCLUDES *******************************************************************/
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#include "npfs.h"
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// File ID number for NPFS bugchecking support
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#define NPFS_BUGCHECK_FILE_ID (NPFS_BUGCHECK_READ)
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/* GLOBALS ********************************************************************/
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LONG NpSlowReadCalls;
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ULONG NpFastReadTrue;
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ULONG NpFastReadFalse;
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/* FUNCTIONS ******************************************************************/
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BOOLEAN
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NTAPI
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NpCommonRead(IN PFILE_OBJECT FileObject,
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IN PVOID Buffer,
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IN ULONG BufferSize,
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OUT PIO_STATUS_BLOCK IoStatus,
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IN PIRP Irp,
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IN PLIST_ENTRY List)
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{
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NODE_TYPE_CODE NodeType;
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PNP_DATA_QUEUE ReadQueue;
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PNP_EVENT_BUFFER EventBuffer;
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NTSTATUS Status;
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ULONG NamedPipeEnd;
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PNP_CCB Ccb;
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PNP_NONPAGED_CCB NonPagedCcb;
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BOOLEAN ReadOk;
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PAGED_CODE();
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IoStatus->Information = 0;
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NodeType = NpDecodeFileObject(FileObject, NULL, &Ccb, &NamedPipeEnd);
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if (!NodeType)
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{
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IoStatus->Status = STATUS_PIPE_DISCONNECTED;
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return TRUE;
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}
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if (NodeType != NPFS_NTC_CCB)
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{
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IoStatus->Status = STATUS_INVALID_PARAMETER;
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return TRUE;
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}
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NonPagedCcb = Ccb->NonPagedCcb;
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ExAcquireResourceExclusiveLite(&NonPagedCcb->Lock, TRUE);
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if (Ccb->NamedPipeState == FILE_PIPE_DISCONNECTED_STATE || Ccb->NamedPipeState == FILE_PIPE_LISTENING_STATE)
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{
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IoStatus->Status = Ccb->NamedPipeState != FILE_PIPE_DISCONNECTED_STATE ? STATUS_PIPE_LISTENING : STATUS_PIPE_DISCONNECTED;
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ReadOk = TRUE;
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goto Quickie;
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}
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ASSERT((Ccb->NamedPipeState == FILE_PIPE_CONNECTED_STATE) || (Ccb->NamedPipeState == FILE_PIPE_CLOSING_STATE));
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if ((NamedPipeEnd == FILE_PIPE_SERVER_END && Ccb->Fcb->NamedPipeConfiguration == FILE_PIPE_OUTBOUND) ||
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(NamedPipeEnd == FILE_PIPE_CLIENT_END && Ccb->Fcb->NamedPipeConfiguration == FILE_PIPE_INBOUND))
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{
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IoStatus->Status = STATUS_INVALID_PARAMETER;
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ReadOk = TRUE;
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goto Quickie;
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}
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if (NamedPipeEnd == FILE_PIPE_SERVER_END)
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{
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ReadQueue = &Ccb->DataQueue[FILE_PIPE_INBOUND];
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}
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else
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{
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ReadQueue = &Ccb->DataQueue[FILE_PIPE_OUTBOUND];
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}
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EventBuffer = NonPagedCcb->EventBuffer[NamedPipeEnd];
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if (ReadQueue->QueueState == WriteEntries)
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{
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*IoStatus = NpReadDataQueue(ReadQueue,
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FALSE,
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FALSE,
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Buffer,
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BufferSize,
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Ccb->ReadMode[NamedPipeEnd],
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Ccb,
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List);
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if (!NT_SUCCESS(IoStatus->Status))
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{
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ReadOk = TRUE;
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goto Quickie;
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}
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ReadOk = TRUE;
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if (EventBuffer) KeSetEvent(EventBuffer->Event, IO_NO_INCREMENT, FALSE);
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goto Quickie;
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}
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if (Ccb->NamedPipeState == FILE_PIPE_CLOSING_STATE)
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{
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IoStatus->Status = STATUS_PIPE_BROKEN;
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ReadOk = TRUE;
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if (EventBuffer) KeSetEvent(EventBuffer->Event, IO_NO_INCREMENT, FALSE);
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goto Quickie;
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}
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if (Ccb->CompletionMode[NamedPipeEnd] == FILE_PIPE_COMPLETE_OPERATION)
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{
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IoStatus->Status = STATUS_PIPE_EMPTY;
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ReadOk = TRUE;
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if (EventBuffer) KeSetEvent(EventBuffer->Event, IO_NO_INCREMENT, FALSE);
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goto Quickie;
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}
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if (!Irp)
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{
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ReadOk = FALSE;
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goto Quickie;
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}
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Status = NpAddDataQueueEntry(NamedPipeEnd,
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Ccb,
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ReadQueue,
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ReadEntries,
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Buffered,
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BufferSize,
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Irp,
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NULL,
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0);
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IoStatus->Status = Status;
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if (!NT_SUCCESS(Status))
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{
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ReadOk = FALSE;
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}
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else
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{
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ReadOk = TRUE;
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if (EventBuffer) KeSetEvent(EventBuffer->Event, IO_NO_INCREMENT, FALSE);
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}
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Quickie:
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ExReleaseResourceLite(&Ccb->NonPagedCcb->Lock);
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return ReadOk;
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}
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NTSTATUS
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NTAPI
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NpFsdRead(IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp)
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{
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PIO_STACK_LOCATION IoStack;
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IO_STATUS_BLOCK IoStatus;
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LIST_ENTRY DeferredList;
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PAGED_CODE();
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NpSlowReadCalls++;
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InitializeListHead(&DeferredList);
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IoStack = IoGetCurrentIrpStackLocation(Irp);
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FsRtlEnterFileSystem();
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NpAcquireSharedVcb();
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NpCommonRead(IoStack->FileObject,
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Irp->UserBuffer,
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IoStack->Parameters.Read.Length,
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&IoStatus,
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Irp,
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&DeferredList);
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NpReleaseVcb();
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NpCompleteDeferredIrps(&DeferredList);
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FsRtlExitFileSystem();
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if (IoStatus.Status != STATUS_PENDING)
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{
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Irp->IoStatus.Information = IoStatus.Information;
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Irp->IoStatus.Status = IoStatus.Status;
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IoCompleteRequest(Irp, IO_NAMED_PIPE_INCREMENT);
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}
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return IoStatus.Status;
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}
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_Function_class_(FAST_IO_READ)
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_IRQL_requires_same_
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BOOLEAN
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NTAPI
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NpFastRead(
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_In_ PFILE_OBJECT FileObject,
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_In_ PLARGE_INTEGER FileOffset,
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_In_ ULONG Length,
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_In_ BOOLEAN Wait,
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_In_ ULONG LockKey,
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_Out_ PVOID Buffer,
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_Out_ PIO_STATUS_BLOCK IoStatus,
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_In_ PDEVICE_OBJECT DeviceObject)
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{
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LIST_ENTRY DeferredList;
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BOOLEAN Result;
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PAGED_CODE();
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InitializeListHead(&DeferredList);
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FsRtlEnterFileSystem();
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NpAcquireSharedVcb();
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Result = NpCommonRead(FileObject,
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Buffer,
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Length,
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IoStatus,
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NULL,
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&DeferredList);
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if (Result)
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++NpFastReadTrue;
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else
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++NpFastReadFalse;
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NpReleaseVcb();
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NpCompleteDeferredIrps(&DeferredList);
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FsRtlExitFileSystem();
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return Result;
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}
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/* EOF */
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