+++ /dev/null
-/*
- * COPYRIGHT: See COPYING in the top level directory
- * PROJECT: ReactOS File System Recognizer
- * FILE: drivers/filesystems/fs_rec/ffs.c
- * PURPOSE: FFS Recognizer
- * PROGRAMMER: Peter Hater
- * Pierre Schweitzer (pierre@reactos.org)
- */
-
-/* INCLUDES *****************************************************************/
-
-#include "fs_rec.h"
-#include "ffs.h"
-
-#define NDEBUG
-#include <debug.h>
-
-/* FUNCTIONS ****************************************************************/
-
-BOOLEAN
-NTAPI
-FsRecIsFfsDiskLabel(IN PFFSD_DISKLABEL dl)
-{
- return (dl->d_magic == DISKMAGIC);
-}
-
-BOOLEAN
-NTAPI
-FsRecIsFfs1Volume(IN PFFSD_SUPER_BLOCK sb)
-{
- return (sb->fs_magic == FS_UFS1_MAGIC);
-}
-
-BOOLEAN
-NTAPI
-FsRecIsFfs2Volume(IN PFFSD_SUPER_BLOCK sb)
-{
- return (sb->fs_magic == FS_UFS2_MAGIC);
-}
-
-NTSTATUS
-NTAPI
-FsRecFfsFsControl(IN PDEVICE_OBJECT DeviceObject,
- IN PIRP Irp)
-{
- PIO_STACK_LOCATION Stack;
- NTSTATUS Status;
- PDEVICE_OBJECT MountDevice;
- PFFSD_SUPER_BLOCK Spb = NULL;
- PFFSD_DISKLABEL DiskLabel = NULL;
- ULONGLONG FSOffset = 0;
- int i;
- 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 disklabel */
- Offset.QuadPart = LABELSECTOR*SectorSize;
- if (FsRecReadBlock(MountDevice,
- &Offset,
- SectorSize,
- SectorSize,
- (PVOID)&DiskLabel,
- &DeviceError))
- {
- /* Check if it's an actual FFS disk label */
- if (FsRecIsFfsDiskLabel(DiskLabel))
- {
- /* It is! */
- for (i = 0; i < MAXPARTITIONS; i++)
- {
- if (DiskLabel->d_partitions[i].p_fstype == FS_BSDFFS)
- {
- /* Important */
- FSOffset = DiskLabel->d_partitions[i].p_offset;
- FSOffset = FSOffset * SectorSize;
- /* Try to read the superblock */
- Offset.QuadPart = FSOffset+SBLOCK_UFS1;
- if (FsRecReadBlock(MountDevice,
- &Offset,
- SBLOCKSIZE,
- SectorSize,
- (PVOID)&Spb,
- &DeviceError))
- {
- /* Check if it's an actual FFS volume */
- if (FsRecIsFfs1Volume(Spb))
- {
- /* It is! */
- Status = STATUS_FS_DRIVER_REQUIRED;
- }
- else
- {
- /* Free the boot sector if we have one */
- ExFreePool(Spb);
- Spb = NULL;
-
- Offset.QuadPart = FSOffset+SBLOCK_UFS2;
- if (FsRecReadBlock(MountDevice,
- &Offset,
- SBLOCKSIZE,
- SectorSize,
- (PVOID)&Spb,
- &DeviceError))
- {
- /* Check if it's an actual FFS volume */
- if (FsRecIsFfs2Volume(Spb))
- {
- /* It is! */
- Status = STATUS_FS_DRIVER_REQUIRED;
- }
- }
- }
- }
-
- /* Free the boot sector if we have one */
- ExFreePool(Spb);
- Spb = NULL;
- }
- }
- }
- else
- {
- /* Try to read the superblock */
- Offset.QuadPart = FSOffset+SBLOCK_UFS1;
- if (FsRecReadBlock(MountDevice,
- &Offset,
- SBLOCKSIZE,
- SectorSize,
- (PVOID)&Spb,
- &DeviceError))
- {
- /* Check if it's an actual FFS volume */
- if (FsRecIsFfs1Volume(Spb))
- {
- /* It is! */
- Status = STATUS_FS_DRIVER_REQUIRED;
- }
- else
- {
- /* Free the boot sector if we have one */
- ExFreePool(Spb);
- Spb = NULL;
-
- Offset.QuadPart = FSOffset+SBLOCK_UFS2;
- if (FsRecReadBlock(MountDevice,
- &Offset,
- SBLOCKSIZE,
- SectorSize,
- (PVOID)&Spb,
- &DeviceError))
- {
- /* Check if it's an actual FFS volume */
- if (FsRecIsFfs2Volume(Spb))
- {
- /* It is! */
- Status = STATUS_FS_DRIVER_REQUIRED;
- }
- }
- }
- }
-
- /* Free the boot sector if we have one */
- ExFreePool(Spb);
- Spb = NULL;
- }
- }
-
- /* Free the boot sector if we have one */
- ExFreePool(DiskLabel);
- }
- 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\\ffs");
- break;
-
- default:
-
- /* Invalid request */
- Status = STATUS_INVALID_DEVICE_REQUEST;
- }
-
- /* Return Status */
- return Status;
-}
projects / reactos.git / blobdiff