mirror of
https://github.com/reactos/reactos.git
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221 lines
8.2 KiB
C
221 lines
8.2 KiB
C
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/*
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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/ffs.c
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* PURPOSE: FFS 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 "ffs.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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FsRecIsFfsDiskLabel(IN PFFSD_DISKLABEL dl)
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{
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return (dl->d_magic == DISKMAGIC);
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}
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BOOLEAN
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NTAPI
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FsRecIsFfs1Volume(IN PFFSD_SUPER_BLOCK sb)
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{
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return (sb->fs_magic == FS_UFS1_MAGIC);
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}
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BOOLEAN
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NTAPI
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FsRecIsFfs2Volume(IN PFFSD_SUPER_BLOCK sb)
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{
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return (sb->fs_magic == FS_UFS2_MAGIC);
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}
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NTSTATUS
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NTAPI
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FsRecFfsFsControl(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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PFFSD_SUPER_BLOCK Spb = NULL;
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PFFSD_DISKLABEL DiskLabel = NULL;
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ULONGLONG FSOffset = 0;
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int i;
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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 disklabel */
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Offset.QuadPart = LABELSECTOR*SectorSize;
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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)&DiskLabel,
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&DeviceError))
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{
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/* Check if it's an actual FFS disk label */
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if (FsRecIsFfsDiskLabel(DiskLabel))
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{
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/* It is! */
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for (i = 0; i < MAXPARTITIONS; i++)
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{
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if (DiskLabel->d_partitions[i].p_fstype == FS_BSDFFS)
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{
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/* Important */
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FSOffset = DiskLabel->d_partitions[i].p_offset;
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FSOffset = FSOffset * SectorSize;
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/* Try to read the superblock */
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Offset.QuadPart = FSOffset+SBLOCK_UFS1;
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if (FsRecReadBlock(MountDevice,
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&Offset,
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SBLOCKSIZE,
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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 FFS volume */
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if (FsRecIsFfs1Volume(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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else
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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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Spb = NULL;
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Offset.QuadPart = FSOffset+SBLOCK_UFS2;
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if (FsRecReadBlock(MountDevice,
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&Offset,
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SBLOCKSIZE,
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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 FFS volume */
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if (FsRecIsFfs2Volume(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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}
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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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Spb = NULL;
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}
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}
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}
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else
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{
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/* Try to read the superblock */
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Offset.QuadPart = FSOffset+SBLOCK_UFS1;
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if (FsRecReadBlock(MountDevice,
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&Offset,
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SBLOCKSIZE,
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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 FFS volume */
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if (FsRecIsFfs1Volume(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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else
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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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Spb = NULL;
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Offset.QuadPart = FSOffset+SBLOCK_UFS2;
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if (FsRecReadBlock(MountDevice,
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&Offset,
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SBLOCKSIZE,
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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 FFS volume */
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if (FsRecIsFfs2Volume(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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}
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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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Spb = NULL;
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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(DiskLabel);
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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\\ffs");
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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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