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