drivers/fs/fs_rec/cdfs.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 2002 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /* $Id$
  20  *
  21  * COPYRIGHT:        See COPYING in the top level directory
  22  * PROJECT:          ReactOS kernel
  23  * FILE:             services/fs/fs_rec/cdfs.c
  24  * PURPOSE:          Filesystem recognizer driver
  25  * PROGRAMMER:       Eric Kohl
  26  */
  27
  28 /* INCLUDES *****************************************************************/
  29
  30 #include <ddk/ntddk.h>
  31
  32 #define NDEBUG
  33 #include <debug.h>
  34
  35 #include "fs_rec.h"
  36
  37
  38 #define CDFS_PVD_SECTOR   16
  39
  40 /* FUNCTIONS ****************************************************************/
  41
  42 static NTSTATUS
  43 FsRecIsCdfsVolume(IN PDEVICE_OBJECT DeviceObject)
  44 {
  45   DISK_GEOMETRY DiskGeometry;
  46   PUCHAR Buffer;
  47   NTSTATUS Status;
  48   ULONG Size;
  49
  50   Size = sizeof(DISK_GEOMETRY);
  51   Status = FsRecDeviceIoControl(DeviceObject,
  52                                 IOCTL_CDROM_GET_DRIVE_GEOMETRY,
  53                                 NULL,
  54                                 0,
  55                                 &DiskGeometry,
  56                                 &Size);
  57   if (!NT_SUCCESS(Status))
  58     {
  59       DPRINT("FsRecDeviceIoControl() failed (Status %lx)\n", Status);
  60       return(Status);
  61     }
  62
  63   DPRINT("BytesPerSector: %lu\n", DiskGeometry.BytesPerSector);
  64   Buffer = ExAllocatePool(NonPagedPool,
  65                           DiskGeometry.BytesPerSector);
  66   if (Buffer == NULL)
  67     {
  68       return(STATUS_INSUFFICIENT_RESOURCES);
  69     }
  70
  71   Status = FsRecReadSectors(DeviceObject,
  72                             CDFS_PVD_SECTOR,
  73                             1,
  74                             DiskGeometry.BytesPerSector,
  75                             Buffer);
  76   if (!NT_SUCCESS(Status))
  77     {
  78       DPRINT("FsRecReadSectors() failed (Status %lx)\n", Status);
  79       return(Status);
  80     }
  81
  82   Buffer[6] = 0;
  83   DPRINT("CD-identifier: [%.5s]\n", Buffer + 1);
  84
  85   Status = (Buffer[0] == 1 &&
  86             Buffer[1] == 'C' &&
  87             Buffer[2] == 'D' &&
  88             Buffer[3] == '0' &&
  89             Buffer[4] == '0' &&
  90             Buffer[5] == '1') ? STATUS_SUCCESS : STATUS_UNRECOGNIZED_VOLUME;
  91
  92   ExFreePool(Buffer);
  93
  94   return(Status);
  95 }
  96
  97
  98 NTSTATUS
  99 FsRecCdfsFsControl(IN PDEVICE_OBJECT DeviceObject,
 100                    IN PIRP Irp)
 101 {
 102   PIO_STACK_LOCATION Stack;
 103   UNICODE_STRING RegistryPath;
 104   NTSTATUS Status;
 105
 106   Stack = IoGetCurrentIrpStackLocation(Irp);
 107
 108   switch (Stack->MinorFunction)
 109     {
 110       case IRP_MN_MOUNT_VOLUME:
 111         DPRINT("Cdfs: IRP_MN_MOUNT_VOLUME\n");
 112         Status = FsRecIsCdfsVolume(Stack->Parameters.MountVolume.DeviceObject);
 113         if (NT_SUCCESS(Status))
 114           {
 115             DPRINT("Identified CDFS volume\n");
 116             Status = STATUS_FS_DRIVER_REQUIRED;
 117           }
 118         break;
 119
 120       case IRP_MN_LOAD_FILE_SYSTEM:
 121         DPRINT("Cdfs: IRP_MN_LOAD_FILE_SYSTEM\n");
 122         RtlInitUnicodeStringFromLiteral(&RegistryPath,
 123                              L"\\Registry\\Machine\\System\\CurrentControlSet\\Services\\Cdfs");
 124         Status = ZwLoadDriver(&RegistryPath);
 125         if (!NT_SUCCESS(Status))
 126           {
 127             DPRINT("ZwLoadDriver failed (Status %x)\n", Status);
 128           }
 129         else
 130           {
 131             IoUnregisterFileSystem(DeviceObject);
 132           }
 133         break;
 134
 135       default:
 136         DPRINT("Cdfs: Unknown minor function %lx\n", Stack->MinorFunction);
 137         Status = STATUS_INVALID_DEVICE_REQUEST;
 138         break;
 139     }
 140   return(Status);
 141 }
 142
 143 /* EOF */