3 * Copyright (C) 2002 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.
19 /* $Id: fat.c,v 1.4 2002/08/20 20:37:06 hyperion Exp $
21 * COPYRIGHT: See COPYING in the top level directory
22 * PROJECT: ReactOS kernel
23 * FILE: services/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
))
79 if ((strncmp(&Buffer
[0x36], "FAT12", 5) == 0) ||
80 (strncmp(&Buffer
[0x36], "FAT16", 5) == 0) ||
81 (strncmp(&Buffer
[0x52], "FAT32", 5) == 0))
83 Status
= STATUS_SUCCESS
;
87 Status
= STATUS_UNRECOGNIZED_VOLUME
;
97 FsRecVfatFsControl(IN PDEVICE_OBJECT DeviceObject
,
100 PIO_STACK_LOCATION Stack
;
101 UNICODE_STRING RegistryPath
;
104 Stack
= IoGetCurrentIrpStackLocation(Irp
);
106 switch (Stack
->MinorFunction
)
108 case IRP_MN_MOUNT_VOLUME
:
109 DPRINT("FAT: IRP_MN_MOUNT_VOLUME\n");
110 Status
= FsRecIsFatVolume(Stack
->Parameters
.MountVolume
.DeviceObject
);
111 if (NT_SUCCESS(Status
))
113 DPRINT("Identified FAT volume\n");
114 Status
= STATUS_FS_DRIVER_REQUIRED
;
118 case IRP_MN_LOAD_FILE_SYSTEM
:
119 DPRINT("FAT: IRP_MN_LOAD_FILE_SYSTEM\n");
120 RtlInitUnicodeStringFromLiteral(&RegistryPath
,
121 L
"\\Registry\\Machine\\System\\CurrentControlSet\\Services\\Vfatfs");
122 Status
= ZwLoadDriver(&RegistryPath
);
123 if (!NT_SUCCESS(Status
))
125 DPRINT("ZwLoadDriver failed (Status %x)\n", Status
);
129 IoUnregisterFileSystem(DeviceObject
);
134 DPRINT("FAT: Unknown minor function %lx\n", Stack
->MinorFunction
);
135 Status
= STATUS_INVALID_DEVICE_REQUEST
;