mirror of
https://github.com/reactos/reactos.git
synced 2024-12-19 00:53:33 +08:00
123 lines
3.5 KiB
C
123 lines
3.5 KiB
C
/*
|
|
* COPYRIGHT: See COPYING in the top level directory
|
|
* PROJECT: ReactOS File System Recognizer
|
|
* FILE: drivers/filesystems/fs_rec/btrfs.c
|
|
* PURPOSE: Btrfs Recognizer
|
|
* PROGRAMMER: Peter Hater
|
|
* Pierre Schweitzer (pierre@reactos.org)
|
|
*/
|
|
|
|
/* INCLUDES *****************************************************************/
|
|
|
|
#include "fs_rec.h"
|
|
#include "reiserfs.h"
|
|
|
|
#define NDEBUG
|
|
#include <debug.h>
|
|
|
|
/* FUNCTIONS ****************************************************************/
|
|
|
|
BOOLEAN
|
|
NTAPI
|
|
FsRecIsReiserfsVolume(IN PRFSD_SUPER_BLOCK sb)
|
|
{
|
|
UCHAR sz_MagicKey[] = REISER2FS_SUPER_MAGIC_STRING;
|
|
UCHAR currentChar;
|
|
int i;
|
|
|
|
// If any characters read from disk don't match the expected magic key, we don't have a ReiserFS volume.
|
|
for (i = 0; i < MAGIC_KEY_LENGTH; i++)
|
|
{
|
|
currentChar = sb->s_magic[i];
|
|
if (currentChar != sz_MagicKey[i])
|
|
{
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
NTSTATUS
|
|
NTAPI
|
|
FsRecReiserfsFsControl(IN PDEVICE_OBJECT DeviceObject,
|
|
IN PIRP Irp)
|
|
{
|
|
PIO_STACK_LOCATION Stack;
|
|
NTSTATUS Status;
|
|
PDEVICE_OBJECT MountDevice;
|
|
PRFSD_SUPER_BLOCK Spb = NULL;
|
|
ULONG SectorSize;
|
|
LARGE_INTEGER Offset;
|
|
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 superblock */
|
|
Offset.QuadPart = REISERFS_DISK_OFFSET_IN_BYTES;
|
|
if (FsRecReadBlock(MountDevice,
|
|
&Offset,
|
|
SectorSize,
|
|
SectorSize,
|
|
(PVOID)&Spb,
|
|
&DeviceError))
|
|
{
|
|
/* Check if it's an actual BTRFS volume */
|
|
if (FsRecIsReiserfsVolume(Spb))
|
|
{
|
|
/* It is! */
|
|
Status = STATUS_FS_DRIVER_REQUIRED;
|
|
}
|
|
}
|
|
|
|
/* Free the boot sector if we have one */
|
|
ExFreePool(Spb);
|
|
}
|
|
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\\reiserfs");
|
|
break;
|
|
|
|
default:
|
|
|
|
/* Invalid request */
|
|
Status = STATUS_INVALID_DEVICE_REQUEST;
|
|
}
|
|
|
|
/* Return Status */
|
|
return Status;
|
|
}
|