reactos/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 /*
  20  * COPYRIGHT:        See COPYING in the top level directory
  21  * PROJECT:          ReactOS kernel
  22  * FILE:             services/fs/fs_rec/cdfs.c
  23  * PURPOSE:          Filesystem recognizer driver
  24  * PROGRAMMER:       Eric Kohl
  25  */
  26
  27 /* INCLUDES *****************************************************************/
  28
  29 #define NDEBUG
  30 #include <debug.h>
  31
  32 #include "fs_rec.h"
  33
  34
  35 #define CDFS_PVD_SECTOR   16
  36
  37 /* FUNCTIONS ****************************************************************/
  38
  39 static NTSTATUS
  40 FsRecIsCdfsVolume(IN PDEVICE_OBJECT DeviceObject)
  41 {
  42   DISK_GEOMETRY DiskGeometry;
  43   PUCHAR Buffer;
  44   NTSTATUS Status;
  45   ULONG Size;
  46
  47   Size = sizeof(DISK_GEOMETRY);
  48   Status = FsRecDeviceIoControl(DeviceObject,
  49                                 IOCTL_CDROM_GET_DRIVE_GEOMETRY,
  50                                 NULL,
  51                                 0,
  52                                 &DiskGeometry,
  53                                 &Size);
  54   if (!NT_SUCCESS(Status))
  55     {
  56       DPRINT("FsRecDeviceIoControl() failed (Status %lx)\n", Status);
  57       return(Status);
  58     }
  59
  60   DPRINT("BytesPerSector: %lu\n", DiskGeometry.BytesPerSector);
  61   Buffer = ExAllocatePool(NonPagedPool,
  62                           DiskGeometry.BytesPerSector);
  63   if (Buffer == NULL)
  64     {
  65       return(STATUS_INSUFFICIENT_RESOURCES);
  66     }
  67
  68   Status = FsRecReadSectors(DeviceObject,
  69                             CDFS_PVD_SECTOR,
  70                             1,
  71                             DiskGeometry.BytesPerSector,
  72                             Buffer);
  73   if (!NT_SUCCESS(Status))
  74     {
  75       DPRINT("FsRecReadSectors() failed (Status %lx)\n", Status);
  76       ExFreePool(Buffer);
  77       return(Status);
  78     }
  79
  80   Buffer[6] = 0;
  81   DPRINT("CD-identifier: [%.5s]\n", Buffer + 1);
  82
  83   Status = (Buffer[0] == 1 &&
  84             Buffer[1] == 'C' &&
  85             Buffer[2] == 'D' &&
  86             Buffer[3] == '0' &&
  87             Buffer[4] == '0' &&
  88             Buffer[5] == '1') ? STATUS_SUCCESS : STATUS_UNRECOGNIZED_VOLUME;
  89
  90   ExFreePool(Buffer);
  91
  92   return(Status);
  93 }
  94
  95
  96 NTSTATUS
  97 FsRecCdfsFsControl(IN PDEVICE_OBJECT DeviceObject,
  98                    IN PIRP Irp)
  99 {
 100   PIO_STACK_LOCATION Stack;
 101   static UNICODE_STRING RegistryPath =
 102     RTL_CONSTANT_STRING(L"\\Registry\\Machine\\System\\CurrentControlSet\\Services\\Cdfs");
 103   NTSTATUS Status;
 104
 105   Stack = IoGetCurrentIrpStackLocation(Irp);
 106
 107   switch (Stack->MinorFunction)
 108     {
 109       case IRP_MN_MOUNT_VOLUME:
 110         DPRINT("Cdfs: IRP_MN_MOUNT_VOLUME\n");
 111         Status = FsRecIsCdfsVolume(Stack->Parameters.MountVolume.DeviceObject);
 112         if (NT_SUCCESS(Status))
 113           {
 114             DPRINT("Identified CDFS volume\n");
 115             Status = STATUS_FS_DRIVER_REQUIRED;
 116           }
 117         break;
 118
 119       case IRP_MN_LOAD_FILE_SYSTEM:
 120         DPRINT("Cdfs: IRP_MN_LOAD_FILE_SYSTEM\n");
 121         Status = ZwLoadDriver(&RegistryPath);
 122         if (!NT_SUCCESS(Status))
 123           {
 124             DPRINT("ZwLoadDriver failed (Status %x)\n", Status);
 125           }
 126         else
 127           {
 128             IoUnregisterFileSystem(DeviceObject);
 129           }
 130         break;
 131
 132       default:
 133         DPRINT("Cdfs: Unknown minor function %lx\n", Stack->MinorFunction);
 134         Status = STATUS_INVALID_DEVICE_REQUEST;
 135         break;
 136     }
 137   return(Status);
 138 }
 139
 140 /* EOF */