3 * Copyright (C) 2002,2003 ReactOS Team
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.
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.
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.
21 * COPYRIGHT: See COPYING in the top level directory
22 * PROJECT: ReactOS kernel
23 * FILE: drivers/fs/fs_rec/vfat.c
24 * PURPOSE: Filesystem recognizer driver
25 * PROGRAMMER: Eric Kohl
28 /* INCLUDES *****************************************************************/
30 #include <ddk/ntddk.h>
38 /* FUNCTIONS ****************************************************************/
41 FsRecIsFatVolume(IN PDEVICE_OBJECT DeviceObject)
43 DISK_GEOMETRY DiskGeometry;
48 Size = sizeof(DISK_GEOMETRY);
49 Status = FsRecDeviceIoControl(DeviceObject,
50 IOCTL_DISK_GET_DRIVE_GEOMETRY,
55 DPRINT("FsRecDeviceIoControl() Status %lx\n", Status);
56 if (!NT_SUCCESS(Status))
61 DPRINT("BytesPerSector: %lu\n", DiskGeometry.BytesPerSector);
62 Buffer = ExAllocatePool(NonPagedPool,
63 DiskGeometry.BytesPerSector);
66 return(STATUS_INSUFFICIENT_RESOURCES);
69 Status = FsRecReadSectors(DeviceObject,
70 0, /* Partition boot sector */
72 DiskGeometry.BytesPerSector,
74 if (!NT_SUCCESS(Status))
80 if ((strncmp(&Buffer[0x36], "FAT12", 5) == 0) ||
81 (strncmp(&Buffer[0x36], "FAT16", 5) == 0) ||
82 (strncmp(&Buffer[0x52], "FAT32", 5) == 0))
84 Status = STATUS_SUCCESS;
88 Status = STATUS_UNRECOGNIZED_VOLUME;
98 FsRecVfatFsControl(IN PDEVICE_OBJECT DeviceObject,
101 PIO_STACK_LOCATION Stack;
102 UNICODE_STRING RegistryPath;
105 Stack = IoGetCurrentIrpStackLocation(Irp);
107 switch (Stack->MinorFunction)
109 case IRP_MN_MOUNT_VOLUME:
110 DPRINT("FAT: IRP_MN_MOUNT_VOLUME\n");
111 Status = FsRecIsFatVolume(Stack->Parameters.MountVolume.DeviceObject);
112 if (NT_SUCCESS(Status))
114 DPRINT("Identified FAT volume\n");
115 Status = STATUS_FS_DRIVER_REQUIRED;
119 case IRP_MN_LOAD_FILE_SYSTEM:
120 DPRINT("FAT: IRP_MN_LOAD_FILE_SYSTEM\n");
121 RtlInitUnicodeStringFromLiteral(&RegistryPath,
122 L"\\Registry\\Machine\\System\\CurrentControlSet\\Services\\Vfatfs");
123 Status = ZwLoadDriver(&RegistryPath);
124 if (!NT_SUCCESS(Status))
126 DPRINT("ZwLoadDriver failed (Status %x)\n", Status);
130 IoUnregisterFileSystem(DeviceObject);
135 DPRINT("FAT: Unknown minor function %lx\n", Stack->MinorFunction);
136 Status = STATUS_INVALID_DEVICE_REQUEST;