194 lines
5.2 KiB
C
194 lines
5.2 KiB
C
//+----------------------------------------------------------------------------
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//
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// Copyright (C) 1992, Microsoft Corporation.
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//
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// File: ATTACH.C
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//
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// Contents: This module contains routines for managing attached file
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// systems.
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//
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// Functions:
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//
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// History: 15 May 1992 PeterCo Created.
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//
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//-----------------------------------------------------------------------------
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#include "dfsprocs.h"
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#define Dbg (DEBUG_TRACE_ATTACH)
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#ifdef ALLOC_PRAGMA
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//
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// The following are not pageable since they can be called at DPC level
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//
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// DfsVolumePassThrough
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// DfsFilePassThrough
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//
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#endif // ALLOC_PRAGMA
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//+-------------------------------------------------------------------
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//
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// Function: DfsVolumePassThrough, public
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//
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// Synopsis: This is the main FSD routine that passes a request
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// on to an attached-to device, or to a redirected
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// file.
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//
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// Arguments: [DeviceObject] -- Supplies a pointer to the Dfs device
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// object this request was aimed at.
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// [Irp] -- Supplies a pointer to the I/O request packet.
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//
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// Returns: [STATUS_INVALID_DEVICE_REQUEST] -- If the DeviceObject
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// argument is of unknown type, or the type of file
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// is invalid for the request being performed.
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//
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// NT Status from calling the underlying file system that
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// opened the file.
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//
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//--------------------------------------------------------------------
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NTSTATUS
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DfsVolumePassThrough(
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp
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)
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{
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NTSTATUS Status = STATUS_SUCCESS;
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PIO_STACK_LOCATION IrpSp;
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PIO_STACK_LOCATION NextIrpSp;
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DfsDbgTrace(+1, Dbg, "DfsVolumePassThrough: Entered\n", 0);
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IrpSp = IoGetCurrentIrpStackLocation(Irp);
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DfsDbgTrace(0, Dbg, "DeviceObject = %x\n", DeviceObject);
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DfsDbgTrace(0, Dbg, "Irp = %x\n", Irp );
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DfsDbgTrace(0, Dbg, " MajorFunction = %x\n", IrpSp->MajorFunction );
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DfsDbgTrace(0, Dbg, " MinorFunction = %x\n", IrpSp->MinorFunction );
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if (DeviceObject->DeviceType == FILE_DEVICE_DFS) {
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TYPE_OF_OPEN TypeOfOpen;
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PDFS_VCB Vcb;
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PDFS_FCB Fcb;
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TypeOfOpen = DfsDecodeFileObject( IrpSp->FileObject, &Vcb, &Fcb);
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DfsDbgTrace(0, Dbg, "Fcb = %08lx\n", Fcb);
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if (TypeOfOpen == RedirectedFileOpen) {
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//
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// Copy the stack from one to the next...
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//
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NextIrpSp = IoGetNextIrpStackLocation(Irp);
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(*NextIrpSp) = (*IrpSp);
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IoSetCompletionRoutine(Irp, NULL, NULL, FALSE, FALSE, FALSE);
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//
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// ...and call the next device
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//
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Status = IoCallDriver( Fcb->TargetDevice, Irp );
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} else {
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DfsDbgTrace(0, 0, "DfsVolumePassThrough: TypeOfOpen = %s\n",
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(TypeOfOpen == UnopenedFileObject) ? "UnopenedFileObject":
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(TypeOfOpen == LogicalRootDeviceOpen) ?
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"LogicalRootDeviceOpen" : "???");
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DfsDbgTrace(0, Dbg, "Irp = %x\n", Irp);
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DfsDbgTrace(0, Dbg, " MajorFunction = %x\n", IrpSp->MajorFunction);
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DfsDbgTrace(0, Dbg, " MinorFunction = %x\n", IrpSp->MinorFunction);
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Status = STATUS_INVALID_DEVICE_REQUEST;
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Irp->IoStatus.Status = Status;
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IoCompleteRequest(Irp, IO_NO_INCREMENT);
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}
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} else {
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DfsDbgTrace(0, 0, "DfsVolumePassThrough: Unexpected Dev = %x\n",
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DeviceObject);
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Status = STATUS_INVALID_DEVICE_REQUEST;
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Irp->IoStatus.Status = Status;
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IoCompleteRequest(Irp, IO_NO_INCREMENT);
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}
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DfsDbgTrace(-1, Dbg, "DfsVolumePassThrough: Exit -> %08lx\n", Status);
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return Status;
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}
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//+-------------------------------------------------------------------
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//
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// Function: DfsFilePassThrough, public
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//
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// Synopsis: Like DfsVolumePassThrough, but used when the file object
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// has already been looked up, and the FCB for the file is
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// already known. This is needed especially in close processing
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// to avoid a race between DfsLookupFcb (for a reused file object)
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// and DfsDetachFcb.
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//
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// Arguments: [pFcb] -- A pointer to an FCB for the file.
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// [Irp] -- A pointer to the I/O request packet.
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//
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// Returns: NTSTATUS - the return value from IoCallDriver.
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//
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//--------------------------------------------------------------------
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NTSTATUS
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DfsFilePassThrough(
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IN PDFS_FCB pFcb,
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IN PIRP Irp
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)
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{
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NTSTATUS Status = STATUS_SUCCESS;
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PIO_STACK_LOCATION IrpSp;
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PIO_STACK_LOCATION NextIrpSp;
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DfsDbgTrace(+1, Dbg, "DfsFilePassThrough: Entered\n", 0);
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IrpSp = IoGetCurrentIrpStackLocation(Irp);
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//
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// Copy the stack from one to the next...
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//
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NextIrpSp = IoGetNextIrpStackLocation(Irp);
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(*NextIrpSp) = (*IrpSp);
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IoSetCompletionRoutine(Irp, NULL, NULL, FALSE, FALSE, FALSE);
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//
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// ...and call the next device
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//
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Status = IoCallDriver( pFcb->TargetDevice, Irp );
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DfsDbgTrace(-1, Dbg, "DfsFilePassThrough: Exit -> %08lx\n", Status);
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return Status;
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}
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