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122 lines
3.5 KiB
C
122 lines
3.5 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS File System Recognizer
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* FILE: drivers/filesystems/fs_rec/btrfs.c
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* PURPOSE: Btrfs Recognizer
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* PROGRAMMER: Peter Hater
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* Pierre Schweitzer (pierre@reactos.org)
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*/
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/* INCLUDES *****************************************************************/
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#include "fs_rec.h"
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#include "reiserfs.h"
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#define NDEBUG
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#include <debug.h>
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/* FUNCTIONS ****************************************************************/
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BOOLEAN
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NTAPI
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FsRecIsReiserfsVolume(IN PRFSD_SUPER_BLOCK sb)
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{
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UCHAR sz_MagicKey[] = REISER2FS_SUPER_MAGIC_STRING;
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UCHAR currentChar;
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int i;
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// If any characters read from disk don't match the expected magic key, we don't have a ReiserFS volume.
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for (i = 0; i < MAGIC_KEY_LENGTH; i++)
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{
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currentChar = sb->s_magic[i];
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if (currentChar != sz_MagicKey[i])
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{
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return FALSE;
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}
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}
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return TRUE;
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}
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NTSTATUS
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NTAPI
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FsRecReiserfsFsControl(IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp)
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{
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PIO_STACK_LOCATION Stack;
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NTSTATUS Status;
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PDEVICE_OBJECT MountDevice;
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PRFSD_SUPER_BLOCK Spb = NULL;
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ULONG SectorSize;
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LARGE_INTEGER Offset;
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BOOLEAN DeviceError = FALSE;
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PAGED_CODE();
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/* Get the I/O Stack and check the function type */
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Stack = IoGetCurrentIrpStackLocation(Irp);
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switch (Stack->MinorFunction)
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{
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case IRP_MN_MOUNT_VOLUME:
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/* Assume failure */
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Status = STATUS_UNRECOGNIZED_VOLUME;
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/* Get the device object and request the sector size */
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MountDevice = Stack->Parameters.MountVolume.DeviceObject;
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if (FsRecGetDeviceSectorSize(MountDevice, &SectorSize))
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{
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/* Try to read the superblock */
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Offset.QuadPart = REISERFS_DISK_OFFSET_IN_BYTES;
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if (FsRecReadBlock(MountDevice,
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&Offset,
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SectorSize,
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SectorSize,
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(PVOID)&Spb,
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&DeviceError))
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{
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/* Check if it's an actual BTRFS volume */
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if (FsRecIsReiserfsVolume(Spb))
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{
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/* It is! */
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Status = STATUS_FS_DRIVER_REQUIRED;
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}
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}
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/* Free the boot sector if we have one */
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ExFreePool(Spb);
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}
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else
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{
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/* We have some sort of failure in the storage stack */
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DeviceError = TRUE;
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}
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/* Check if we have an error on the stack */
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if (DeviceError)
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{
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/* Was this because of a floppy? */
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if (MountDevice->Characteristics & FILE_FLOPPY_DISKETTE)
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{
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/* Let the FS try anyway */
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Status = STATUS_FS_DRIVER_REQUIRED;
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}
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}
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break;
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case IRP_MN_LOAD_FILE_SYSTEM:
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/* Load the file system */
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Status = FsRecLoadFileSystem(DeviceObject,
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L"\\Registry\\Machine\\System\\CurrentControlSet\\Services\\reiserfs");
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break;
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default:
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/* Invalid request */
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Status = STATUS_INVALID_DEVICE_REQUEST;
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}
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/* Return Status */
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return Status;
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}
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