filesystem.c

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/*
 *  ReactOS kernel
 *  Copyright (C) 2002 ReactOS Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
/*
 * COPYRIGHT:        See COPYING in the top level directory
 * PROJECT:          ReactOS kernel
 * PURPOSE:          Bare filesystem template
 * PROGRAMMER:       David Welch (welch@mcmail.com)
 * UPDATE HISTORY:
 */
 
/* INCLUDES *****************************************************************/
 
#include <ntddk.h>
 
#define NDEBUG
#include <debug.h>
 
typedef struct
{
   PDEVICE_OBJECT StorageDevice;
} DEVICE_EXTENSION, *PDEVICE_EXTENSION;
 
/* GLOBALS ******************************************************************/
 
static PDRIVER_OBJECT DriverObject;
 
/* FUNCTIONS ****************************************************************/
 
NTSTATUS NTAPI
FsdCloseFile(PDEVICE_EXTENSION DeviceExt,
         PFILE_OBJECT FileObject)
/*
 * FUNCTION: Closes a file
 */
{
  return(STATUS_SUCCESS);
}
 
 
NTSTATUS NTAPI
FsdOpenFile(PDEVICE_EXTENSION DeviceExt,
        PFILE_OBJECT FileObject,
        PWSTR FileName)
/*
 * FUNCTION: Opens a file
 */
{
  return(STATUS_SUCCESS);
}
 
 
BOOLEAN NTAPI
FsdHasFileSystem(PDEVICE_OBJECT DeviceToMount)
/*
 * FUNCTION: Tests if the device contains a filesystem that can be mounted
 * by this fsd
 */
{
  return(TRUE);
}
 
 
NTSTATUS NTAPI
FsdMountDevice(PDEVICE_EXTENSION DeviceExt,
           PDEVICE_OBJECT DeviceToMount)
/*
 * FUNCTION: Mounts the device
 */
{
  return(STATUS_SUCCESS);
}
 
 
NTSTATUS NTAPI
FsdReadFile(PDEVICE_EXTENSION DeviceExt,
        PFILE_OBJECT FileObject,
        PVOID Buffer,
        ULONG Length,
        ULONG Offset)
/*
 * FUNCTION: Reads data from a file
 */
{
  return(STATUS_SUCCESS);
}
 
 
NTSTATUS NTAPI
FsdClose(PDEVICE_OBJECT DeviceObject,
     PIRP Irp)
{
  PIO_STACK_LOCATION Stack = IoGetCurrentIrpStackLocation(Irp);
  PFILE_OBJECT FileObject = Stack->FileObject;
  PDEVICE_EXTENSION DeviceExtension = DeviceObject->DeviceExtension;
  NTSTATUS Status;
 
  Status = FsdCloseFile(DeviceExtension,FileObject);
 
  Irp->IoStatus.Status = Status;
  Irp->IoStatus.Information = 0;
 
  IoCompleteRequest(Irp, IO_NO_INCREMENT);
  return(Status);
}
 
 
NTSTATUS NTAPI
FsdCreate(PDEVICE_OBJECT DeviceObject,
      PIRP Irp)
{
  PIO_STACK_LOCATION Stack = IoGetCurrentIrpStackLocation(Irp);
  PFILE_OBJECT FileObject = Stack->FileObject;
  NTSTATUS Status;
  PDEVICE_EXTENSION DeviceExt;
 
  DeviceExt = DeviceObject->DeviceExtension;
  Status = FsdOpenFile(DeviceExt,FileObject,FileObject->FileName.Buffer);
 
  Irp->IoStatus.Status = Status;
  Irp->IoStatus.Information = 0;
 
  IoCompleteRequest(Irp, IO_NO_INCREMENT);
  return(Status);
}
 
 
NTSTATUS NTAPI
FsdWrite(PDEVICE_OBJECT DeviceObject,
     PIRP Irp)
{
  DPRINT("FsdWrite(DeviceObject %x Irp %x)\n",DeviceObject,Irp);
 
  Irp->IoStatus.Status = STATUS_UNSUCCESSFUL;
  Irp->IoStatus.Information = 0;
  return(STATUS_UNSUCCESSFUL);
}
 
NTSTATUS NTAPI
FsdRead(PDEVICE_OBJECT DeviceObject,
    PIRP Irp)
{
  ULONG Length;
  PVOID Buffer;
  ULONG Offset;
  PIO_STACK_LOCATION Stack = IoGetCurrentIrpStackLocation(Irp);
  PFILE_OBJECT FileObject = Stack->FileObject;
  PDEVICE_EXTENSION DeviceExt = DeviceObject->DeviceExtension;
  NTSTATUS Status;
 
  DPRINT("FsdRead(DeviceObject %x, Irp %x)\n",DeviceObject,Irp);
 
  Length = Stack->Parameters.Read.Length;
  Buffer = MmGetSystemAddressForMdl(Irp->MdlAddress);
  Offset = Stack->Parameters.Read.ByteOffset.LowPart;
 
  Status = FsdReadFile(DeviceExt,FileObject,Buffer,Length,Offset);
 
  Irp->IoStatus.Status = Status;
  Irp->IoStatus.Information = Length;
  IoCompleteRequest(Irp,IO_NO_INCREMENT);
  return(Status);
}
 
 
NTSTATUS
FsdMount(PDEVICE_OBJECT DeviceToMount)
{
  PDEVICE_OBJECT DeviceObject;
  PDEVICE_EXTENSION DeviceExt;
 
  IoCreateDevice(DriverObject,
         sizeof(DEVICE_EXTENSION),
         NULL,
         FILE_DEVICE_FILE_SYSTEM,
         0,
         FALSE,
         &DeviceObject);
  DeviceObject->Flags = DeviceObject->Flags | DO_DIRECT_IO;
  DeviceExt = (PVOID)DeviceObject->DeviceExtension;
 
  FsdMountDevice(DeviceExt,
         DeviceToMount);
 
  DeviceExt->StorageDevice = DeviceToMount;
  DeviceExt->StorageDevice->Vpb->DeviceObject = DeviceObject;
  DeviceExt->StorageDevice->Vpb->RealDevice = DeviceExt->StorageDevice;
  DeviceExt->StorageDevice->Vpb->Flags |= VPB_MOUNTED;
  DeviceObject->StackSize = DeviceExt->StorageDevice->StackSize + 1;
  DeviceObject->Flags &= ~DO_DEVICE_INITIALIZING;
 
  return(STATUS_SUCCESS);
}
 
 
NTSTATUS NTAPI
FsdFileSystemControl(PDEVICE_OBJECT DeviceObject,
             PIRP Irp)
{
  PIO_STACK_LOCATION Stack = IoGetCurrentIrpStackLocation(Irp);
  PVPB  vpb = Stack->Parameters.Mount.Vpb;
  PDEVICE_OBJECT DeviceToMount = Stack->Parameters.Mount.DeviceObject;
  NTSTATUS Status;
 
  if (FsdHasFileSystem(DeviceToMount))
    {
      Status = FsdMount(DeviceToMount);
    }
  else
    {
      Status = STATUS_UNRECOGNIZED_VOLUME;
    }
 
  Irp->IoStatus.Status = Status;
  Irp->IoStatus.Information = 0;
 
  IoCompleteRequest(Irp, IO_NO_INCREMENT);
  return(Status);
}
 
 
NTSTATUS NTAPI
DriverEntry(PDRIVER_OBJECT _DriverObject,
        PUNICODE_STRING RegistryPath)
/*
 * FUNCTION: Called by the system to initialize the driver
 * ARGUMENTS:
 *           DriverObject = object describing this driver
 *           RegistryPath = path to our configuration entries
 * RETURNS: Success or failure
 */
{
  PDEVICE_OBJECT DeviceObject;
  NTSTATUS Status;
  UNICODE_STRING DeviceName = RTL_CONSTANT_STRING(L"\\Device\\BareFsd");
 
  DbgPrint("Bare FSD Template 0.0.1\n");
 
  DriverObject = _DriverObject;
 
  Status = IoCreateDevice(DriverObject,
              0,
              &DeviceName,
              FILE_DEVICE_FILE_SYSTEM,
              0,
              FALSE,
              &DeviceObject);
  if (!NT_SUCCESS(Status))
    {
      return(Status);
    }
 
  DeviceObject->Flags=0;
  DriverObject->MajorFunction[IRP_MJ_CLOSE] = FsdClose;
  DriverObject->MajorFunction[IRP_MJ_CREATE] = FsdCreate;
  DriverObject->MajorFunction[IRP_MJ_READ] = FsdRead;
  DriverObject->MajorFunction[IRP_MJ_WRITE] = FsdWrite;
  DriverObject->MajorFunction[IRP_MJ_FILE_SYSTEM_CONTROL] =
                     FsdFileSystemControl;
  DriverObject->DriverUnload = NULL;
 
  IoRegisterFileSystem(DeviceObject);
 
  return(STATUS_SUCCESS);
}
 
/* EOF */