reactos/drivers/filesystems/fs_rec/ext2.c

108 lines
3 KiB
C
Raw Normal View History

/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS File System Recognizer
* FILE: drivers/filesystems/fs_rec/ext2.c
* PURPOSE: EXT2 Recognizer
* PROGRAMMER: Eric Kohl
*/
/* INCLUDES *****************************************************************/
#include "fs_rec.h"
#define NDEBUG
#include <debug.h>
/* FUNCTIONS ****************************************************************/
BOOLEAN
NTAPI
FsRecIsExt2Volume(IN PVOID PackedBootSector)
{
/* For now, always return failure... */
return FALSE;
}
NTSTATUS
NTAPI
FsRecExt2FsControl(IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp)
{
PIO_STACK_LOCATION Stack;
NTSTATUS Status;
PDEVICE_OBJECT MountDevice;
PVOID Bpb = NULL;
ULONG SectorSize;
LARGE_INTEGER Offset = {{0, 0}};
BOOLEAN DeviceError = FALSE;
PAGED_CODE();
/* Get the I/O Stack and check the function type */
Stack = IoGetCurrentIrpStackLocation(Irp);
switch (Stack->MinorFunction)
{
case IRP_MN_MOUNT_VOLUME:
/* Assume failure */
Status = STATUS_UNRECOGNIZED_VOLUME;
/* Get the device object and request the sector size */
MountDevice = Stack->Parameters.MountVolume.DeviceObject;
if (FsRecGetDeviceSectorSize(MountDevice, &SectorSize))
{
/* Try to read the BPB */
if (FsRecReadBlock(MountDevice,
&Offset,
512,
SectorSize,
(PVOID)&Bpb,
&DeviceError))
{
/* Check if it's an actual EXT2 volume */
if (FsRecIsExt2Volume(Bpb))
{
/* It is! */
Status = STATUS_FS_DRIVER_REQUIRED;
}
}
/* Free the boot sector if we have one */
ExFreePool(Bpb);
}
else
{
/* We have some sort of failure in the storage stack */
DeviceError = TRUE;
}
/* Check if we have an error on the stack */
if (DeviceError)
{
/* Was this because of a floppy? */
if (MountDevice->Characteristics & FILE_FLOPPY_DISKETTE)
{
/* Let the FS try anyway */
Status = STATUS_FS_DRIVER_REQUIRED;
}
}
break;
case IRP_MN_LOAD_FILE_SYSTEM:
/* Load the file system */
Status = FsRecLoadFileSystem(DeviceObject,
L"\\Registry\\Machine\\System\\CurrentControlSet\\Services\\Ext2");
break;
default:
/* Invalid request */
Status = STATUS_INVALID_DEVICE_REQUEST;
}
/* Return Status */
return Status;
}
/* EOF */