mirror of
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149 lines
4.7 KiB
C
149 lines
4.7 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/ntfs.c
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* PURPOSE: NTFS Recognizer
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* PROGRAMMER: Alex Ionescu (alex.ionescu@reactos.org)
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* Eric Kohl
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*/
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/* INCLUDES *****************************************************************/
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#include "fs_rec.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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FsRecIsNtfsVolume(IN PPACKED_BOOT_SECTOR BootSector,
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IN ULONG BytesPerSector,
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IN PLARGE_INTEGER NumberOfSectors)
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{
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/* Assume failure */
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BOOLEAN Result = FALSE;
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UNREFERENCED_PARAMETER(BytesPerSector);
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UNREFERENCED_PARAMETER(NumberOfSectors);
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PAGED_CODE();
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if ((BootSector->Oem[0] == 'N') &&
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(BootSector->Oem[1] == 'T') &&
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(BootSector->Oem[2] == 'F') &&
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(BootSector->Oem[3] == 'S') &&
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(BootSector->Oem[4] == ' ') &&
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(BootSector->Oem[5] == ' ') &&
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(BootSector->Oem[6] == ' ') &&
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(BootSector->Oem[7] == ' '))
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{
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/* Success */
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Result = TRUE;
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}
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/* Return the result */
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return Result;
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}
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NTSTATUS
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NTAPI
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FsRecNtfsFsControl(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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PPACKED_BOOT_SECTOR Bpb = NULL;
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ULONG SectorSize;
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LARGE_INTEGER Offset = {{0, 0}}, Offset2, Offset3, SectorCount;
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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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(FsRecGetDeviceSectors(MountDevice, SectorSize, &SectorCount)))
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{
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/* Setup other offsets to try */
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Offset2.QuadPart = SectorCount.QuadPart >> 1;
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Offset2.QuadPart *= SectorSize;
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Offset3.QuadPart = (SectorCount.QuadPart - 1) * SectorSize;
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/* Try to read the BPB */
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if (FsRecReadBlock(MountDevice,
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&Offset,
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512,
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SectorSize,
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(PVOID)&Bpb,
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NULL))
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{
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/* Check if it's an actual NTFS volume */
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if (FsRecIsNtfsVolume(Bpb, SectorSize, &SectorCount))
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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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else if (FsRecReadBlock(MountDevice,
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&Offset2,
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512,
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SectorSize,
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(PVOID)&Bpb,
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NULL))
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{
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/* Check if it's an actual NTFS volume */
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if (FsRecIsNtfsVolume(Bpb, SectorSize, &SectorCount))
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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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else if (FsRecReadBlock(MountDevice,
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&Offset3,
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512,
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SectorSize,
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(PVOID)&Bpb,
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NULL))
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{
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/* Check if it's an actual NTFS volume */
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if (FsRecIsNtfsVolume(Bpb, SectorSize, &SectorCount))
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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(Bpb);
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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\\Ntfs");
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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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/* EOF */
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