reactos/drivers/fs/fs_rec/blockdev.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: blockdev.c,v 1.4 2003/11/13 15:25:28 ekohl Exp $
  20  *
  21  * COPYRIGHT:        See COPYING in the top level directory
  22  * PROJECT:          ReactOS kernel
  23  * FILE:             services/fs/fs_rec/blockdev.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 /* FUNCTIONS ****************************************************************/
  39
  40 NTSTATUS
  41 FsRecReadSectors(IN PDEVICE_OBJECT DeviceObject,
  42                  IN ULONG DiskSector,
  43                  IN ULONG SectorCount,
  44                  IN ULONG SectorSize,
  45                  IN OUT PUCHAR Buffer)
  46 {
  47   IO_STATUS_BLOCK IoStatus;
  48   LARGE_INTEGER Offset;
  49   ULONG BlockSize;
  50   PKEVENT Event;
  51   PIRP Irp;
  52   NTSTATUS Status;
  53
  54   Event = ExAllocatePool(NonPagedPool, sizeof(KEVENT));
  55   if (Event == NULL)
  56     {
  57       return(STATUS_INSUFFICIENT_RESOURCES);
  58     }
  59
  60   KeInitializeEvent(Event,
  61                     NotificationEvent,
  62                     FALSE);
  63
  64   Offset.QuadPart = (LONGLONG)DiskSector * (LONGLONG)SectorSize;
  65   BlockSize = SectorCount * SectorSize;
  66
  67   DPRINT("FsrecReadSectors(DeviceObject %x, DiskSector %d, Buffer %x)\n",
  68          DeviceObject, DiskSector, Buffer);
  69   DPRINT("Offset %I64x BlockSize %ld\n",
  70          Offset.QuadPart,
  71          BlockSize);
  72
  73   DPRINT("Building synchronous FSD Request...\n");
  74   Irp = IoBuildSynchronousFsdRequest(IRP_MJ_READ,
  75                                      DeviceObject,
  76                                      Buffer,
  77                                      BlockSize,
  78                                      &Offset,
  79                                      Event,
  80                                      &IoStatus);
  81   if (Irp == NULL)
  82     {
  83       DPRINT("IoBuildSynchronousFsdRequest failed\n");
  84       ExFreePool(Event);
  85       return(STATUS_INSUFFICIENT_RESOURCES);
  86     }
  87
  88   DPRINT("Calling IO Driver... with irp %x\n", Irp);
  89   Status = IoCallDriver(DeviceObject, Irp);
  90   if (Status == STATUS_PENDING)
  91     {
  92       DPRINT("Operation pending\n");
  93       KeWaitForSingleObject(Event, Suspended, KernelMode, FALSE, NULL);
  94       Status = IoStatus.Status;
  95     }
  96
  97   ExFreePool(Event);
  98
  99   return(STATUS_SUCCESS);
 100 }
 101
 102
 103 NTSTATUS
 104 FsRecDeviceIoControl(IN PDEVICE_OBJECT DeviceObject,
 105                      IN ULONG ControlCode,
 106                      IN PVOID InputBuffer,
 107                      IN ULONG InputBufferSize,
 108                      IN OUT PVOID OutputBuffer,
 109                      IN OUT PULONG OutputBufferSize)
 110 {
 111   ULONG BufferSize = 0;
 112   PKEVENT Event;
 113   PIRP Irp;
 114   IO_STATUS_BLOCK IoStatus;
 115   NTSTATUS Status;
 116
 117   if (OutputBufferSize != NULL)
 118     {
 119       BufferSize = *OutputBufferSize;
 120     }
 121
 122   Event = ExAllocatePool(NonPagedPool, sizeof(KEVENT));
 123   if (Event == NULL)
 124     {
 125       return(STATUS_INSUFFICIENT_RESOURCES);
 126     }
 127
 128   KeInitializeEvent(Event, NotificationEvent, FALSE);
 129
 130   DPRINT("Building device I/O control request ...\n");
 131   Irp = IoBuildDeviceIoControlRequest(ControlCode,
 132                                       DeviceObject,
 133                                       InputBuffer,
 134                                       InputBufferSize,
 135                                       OutputBuffer,
 136                                       BufferSize,
 137                                       FALSE,
 138                                       Event,
 139                                       &IoStatus);
 140   if (Irp == NULL)
 141     {
 142       DPRINT("IoBuildDeviceIoControlRequest() failed\n");
 143       ExFreePool(Event);
 144       return(STATUS_INSUFFICIENT_RESOURCES);
 145     }
 146
 147   DPRINT("Calling IO Driver... with irp %x\n", Irp);
 148   Status = IoCallDriver(DeviceObject, Irp);
 149   if (Status == STATUS_PENDING)
 150     {
 151       KeWaitForSingleObject(Event, Suspended, KernelMode, FALSE, NULL);
 152       Status = IoStatus.Status;
 153     }
 154
 155   if (OutputBufferSize != NULL)
 156     {
 157       *OutputBufferSize = IoStatus.Information;
 158     }
 159
 160   ExFreePool(Event);
 161
 162   return(Status);
 163 }
 164
 165 /* EOF */