/*************************************************************************
*
* Function: Ext2MountVolume()
*
* Description:
* This routine is used for querying the partition information.
*
* Expected Interrupt Level (for execution) :
* IRQL_PASSIVE_LEVEL
*
* Arguments:
*
* TargetDeviceObject - The target of the query
* PartitionInformation - Receives the result of the query
*
* Return Value:
*
* NTSTATUS - The return status for the operation
*
*************************************************************************/
NTSTATUS
Ext2GetPartitionInfo (
IN PDEVICE_OBJECT TargetDeviceObject,
IN PPARTITION_INFORMATION PartitionInformation
)
{
PIRP Irp;
KEVENT *PtrEvent = NULL;
NTSTATUS Status;
IO_STATUS_BLOCK Iosb;
//
// Query the partition table
//
PtrEvent = ( KEVENT * )Ext2AllocatePool( NonPagedPool, Ext2QuadAlign( sizeof( KEVENT ) ) );
KeInitializeEvent( PtrEvent, NotificationEvent, FALSE );
Irp = IoBuildDeviceIoControlRequest( IOCTL_DISK_GET_PARTITION_INFO,
TargetDeviceObject,
NULL,
0,
PartitionInformation,
sizeof(PARTITION_INFORMATION),
FALSE,
PtrEvent,
&Iosb );
if ( Irp == NULL )
{
DebugTrace( DEBUG_TRACE_FREE, "Freeing = %lX [FS Ctrl]", PtrEvent);
ExFreePool( PtrEvent );
return 0;
}
Status = IoCallDriver( TargetDeviceObject, Irp );
if ( Status == STATUS_PENDING ) {
(VOID) KeWaitForSingleObject( PtrEvent,
Executive,
KernelMode,
FALSE,
(PLARGE_INTEGER)NULL );
Status = Iosb.Status;
}
DebugTrace( DEBUG_TRACE_FREE, "Freeing = %lX [FS Ctrl]", PtrEvent);
ExFreePool( PtrEvent );
return Status;
}
NTSTATUS
Ext2ReadDisk(
IN PEXT2_VCB Vcb,
IN ULONGLONG Offset,
IN ULONG Size,
IN PVOID Buffer,
IN BOOLEAN bVerify )
{
NTSTATUS Status;
PUCHAR Buf;
ULONG Length;
ULONGLONG Lba;
Lba = Offset & (~((ULONGLONG)SECTOR_SIZE - 1));
Length = (ULONG)(Size + Offset + SECTOR_SIZE - 1 - Lba) &
(~((ULONG)SECTOR_SIZE - 1));
Buf = Ext2AllocatePool(PagedPool, Length, EXT2_DATA_MAGIC);
if (!Buf) {
DEBUG(DL_ERR, ( "Ext2ReadDisk: failed to allocate Buffer.\n"));
Status = STATUS_INSUFFICIENT_RESOURCES;
goto errorout;
}
INC_MEM_COUNT(PS_DISK_BUFFER, Buf, Length);
Status = Ext2ReadSync( Vcb,
Lba,
Length,
Buf,
FALSE );
if (!NT_SUCCESS(Status)) {
DEBUG(DL_ERR, ( "Ext2ReadDisk: disk device error.\n"));
goto errorout;
}
RtlCopyMemory(Buffer, &Buf[Offset - Lba], Size);
errorout:
if (Buf) {
Ext2FreePool(Buf, EXT2_DATA_MAGIC);
DEC_MEM_COUNT(PS_DISK_BUFFER, Buf, Length);
}
return Status;
}
VOID
Ext2StartFloppyFlushDpc (
PEXT2_VCB Vcb,
PEXT2_FCB Fcb,
PFILE_OBJECT FileObject )
{
LARGE_INTEGER OneSecond;
PEXT2_FLPFLUSH_CONTEXT Context;
ASSERT(IsFlagOn(Vcb->Flags, VCB_FLOPPY_DISK));
Context = Ext2AllocatePool(
NonPagedPool,
sizeof(EXT2_FLPFLUSH_CONTEXT),
EXT2_FLPFLUSH_MAGIC
);
if (!Context) {
DEBUG(DL_ERR, ( "Ex2StartFloppy...: failed to allocate Context\n"));
DbgBreak();
return;
}
KeInitializeTimer(&Context->Timer);
KeInitializeDpc( &Context->Dpc,
Ext2FloppyFlushDpc,
Context );
ExInitializeWorkItem( &Context->Item,
Ext2FloppyFlush,
Context );
Context->Vcb = Vcb;
Context->Fcb = Fcb;
Context->FileObject = FileObject;
if (FileObject) {
ObReferenceObject(FileObject);
}
OneSecond.QuadPart = (LONGLONG)-1*1000*1000*10;
KeSetTimer( &Context->Timer,
OneSecond,
&Context->Dpc );
}
/*************************************************************************
*
* Function: Ext2MountVolume()
*
* Description:
* This routine verifies and mounts the volume;
* Called by FSCTRL IRP handler to attempt a
* volume mount.
*
* Expected Interrupt Level (for execution) :
*
* IRQL_PASSIVE_LEVEL
*
*
* Arguments:
*
* Irp - Supplies the Irp being processed
* IrpSp - Irp Stack Location pointer
*
* Return Value:
*
* NTSTATUS - The Mount status
*
*************************************************************************/
NTSTATUS
Ext2MountVolume (
IN PIRP Irp,
IN PIO_STACK_LOCATION IrpSp )
{
// Volume Parameter Block
PVPB PtrVPB;
// The target device object
PDEVICE_OBJECT TargetDeviceObject = NULL;
// The new volume device object (to be created if partition is Ext2)
PDEVICE_OBJECT PtrVolumeDeviceObject = NULL;
// Return Status
NTSTATUS Status = STATUS_UNRECOGNIZED_VOLUME;
// Number of bytes to read for Volume verification...
unsigned long NumberOfBytesToRead = 0;
// Starting Offset for 'read'
LONGLONG StartingOffset = 0;
// Boot Sector information...
PPACKED_BOOT_SECTOR BootSector = NULL;
// Ext2 Super Block information...
PEXT2_SUPER_BLOCK SuperBlock = NULL;
// Volume Control Block
PtrExt2VCB PtrVCB = NULL;
// The File Object for the root directory
PFILE_OBJECT PtrRootFileObject = NULL;
// Flag
int WeClearedVerifyRequiredBit;
// Used by a for loop...
unsigned int i;
//
LARGE_INTEGER VolumeByteOffset;
unsigned long LogicalBlockSize = 0;
// Buffer Control Block
PBCB PtrBCB = NULL;
// Cache Buffer - used for pinned access of volume...
PVOID PtrCacheBuffer = NULL;
PEXT2_GROUP_DESCRIPTOR PtrGroupDescriptor = NULL;
// Inititalising variables
PtrVPB = IrpSp->Parameters.MountVolume.Vpb;
TargetDeviceObject = IrpSp->Parameters.MountVolume.DeviceObject;
try
{
//
// 1. Reading in Volume meta data
//
// Temporarily clear the DO_VERIFY_VOLUME Flag
WeClearedVerifyRequiredBit = 0;
if ( Ext2IsFlagOn( PtrVPB->RealDevice->Flags, DO_VERIFY_VOLUME ) )
{
Ext2ClearFlag( PtrVPB->RealDevice->Flags, DO_VERIFY_VOLUME );
WeClearedVerifyRequiredBit = 1;
}
// Allocating memory for reading in Boot Sector...
NumberOfBytesToRead = Ext2Align( sizeof( EXT2_SUPER_BLOCK ), TargetDeviceObject->SectorSize );
BootSector = Ext2AllocatePool( PagedPool, NumberOfBytesToRead );
RtlZeroMemory( BootSector, NumberOfBytesToRead );
// Reading in Boot Sector
StartingOffset = 0L;
Ext2PerformVerifyDiskRead ( TargetDeviceObject,
BootSector, StartingOffset, NumberOfBytesToRead );
// Reject a volume that contains fat artifacts
DebugTrace(DEBUG_TRACE_MOUNT, "OEM[%s]", BootSector->Oem);
if (BootSector->Oem[0])
{
try_return();
}
// Allocating memory for reading in Super Block...
SuperBlock = Ext2AllocatePool( PagedPool, NumberOfBytesToRead );
RtlZeroMemory( SuperBlock, NumberOfBytesToRead );
StartingOffset = 1024;
// Reading in the Super Block...
Ext2PerformVerifyDiskRead ( TargetDeviceObject,
SuperBlock, StartingOffset, NumberOfBytesToRead );
// Resetting the DO_VERIFY_VOLUME Flag
if( WeClearedVerifyRequiredBit )
{
PtrVPB->RealDevice->Flags |= DO_VERIFY_VOLUME;
}
// Verifying the Super Block..
if( SuperBlock->s_magic == EXT2_SUPER_MAGIC )
{
//
// Found a valid super block.
// No more tests for now.
// Assuming that this is an ext2 partition...
// Going ahead with mount.
//
DebugTrace(DEBUG_TRACE_MOUNT, "Valid Ext2 partition detected\nMounting %s...", SuperBlock->s_volume_name);
//
// 2. Creating a volume device object
//
if (!NT_SUCCESS( IoCreateDevice(
Ext2GlobalData.Ext2DriverObject, // (This) Driver object
Ext2QuadAlign( sizeof(Ext2VCB) ), // Device Extension
NULL, // Device Name - no name ;)
FILE_DEVICE_DISK_FILE_SYSTEM, // Disk File System
0, // DeviceCharacteristics
FALSE, // Not an exclusive device
(PDEVICE_OBJECT *)&PtrVolumeDeviceObject)) // The Volume Device Object
)
{
try_return();
}
//
// Our alignment requirement is the larger of the processor alignment requirement
// already in the volume device object and that in the TargetDeviceObject
//
if (TargetDeviceObject->AlignmentRequirement > PtrVolumeDeviceObject->AlignmentRequirement)
{
PtrVolumeDeviceObject->AlignmentRequirement = TargetDeviceObject->AlignmentRequirement;
}
//
// Clearing the Device Initialising Flag
//
Ext2ClearFlag( PtrVolumeDeviceObject->Flags, DO_DEVICE_INITIALIZING);
//
// Setting the Stack Size for the newly created Volume Device Object
//
PtrVolumeDeviceObject->StackSize = (CCHAR)(TargetDeviceObject->StackSize + 1);
//
// 3. Creating the link between Target Device Object
// and the Volume Device Object via the Volume Parameter Block
//
PtrVPB->DeviceObject = PtrVolumeDeviceObject;
// Remembring the Volume parameters in the VPB bock
for( i = 0; i < 16 ; i++ )
{
PtrVPB->VolumeLabel[i] = SuperBlock->s_volume_name[i];
if( SuperBlock->s_volume_name[i] == 0 )
break;
}
PtrVPB->VolumeLabelLength = i * 2;
PtrVPB->SerialNumber = ((ULONG*)SuperBlock->s_uuid)[0];
//
// 4. Initialise the Volume Comtrol Block
//
{
LARGE_INTEGER AllocationSize;
AllocationSize .QuadPart =
( EXT2_MIN_BLOCK_SIZE << SuperBlock->s_log_block_size ) *
SuperBlock->s_blocks_count;
Ext2InitializeVCB(
PtrVolumeDeviceObject,
TargetDeviceObject,
PtrVPB,
&AllocationSize);
PtrVCB = (PtrExt2VCB)(PtrVolumeDeviceObject->DeviceExtension);
ASSERT( PtrVCB );
}
PtrVCB->InodesCount = SuperBlock->s_inodes_count;
PtrVCB->BlocksCount = SuperBlock->s_blocks_count;
PtrVCB->ReservedBlocksCount = SuperBlock->s_r_blocks_count;
PtrVCB->FreeBlocksCount = SuperBlock->s_free_blocks_count;
PtrVCB->FreeInodesCount = SuperBlock->s_free_inodes_count;
PtrVCB->LogBlockSize = SuperBlock->s_log_block_size;
PtrVCB->InodesPerGroup = SuperBlock->s_inodes_per_group;
PtrVCB->BlocksPerGroup = SuperBlock->s_blocks_per_group;
PtrVCB->NoOfGroups = ( SuperBlock->s_blocks_count - SuperBlock->s_first_data_block
+ SuperBlock->s_blocks_per_group - 1 )
/ SuperBlock->s_blocks_per_group;
if( SuperBlock->s_rev_level )
{
PtrVCB->InodeSize = SuperBlock->s_inode_size;
}
else
{
PtrVCB->InodeSize = sizeof( EXT2_INODE );
}
PtrVCB->PtrGroupDescriptors = Ext2AllocatePool( NonPagedPool, sizeof( Ext2GroupDescriptors ) * PtrVCB->NoOfGroups );
RtlZeroMemory( PtrVCB->PtrGroupDescriptors , sizeof( Ext2GroupDescriptors ) * PtrVCB->NoOfGroups );
//
// Attempting to Read in some matadata from the Cache...
// using pin access...
//
LogicalBlockSize = EXT2_MIN_BLOCK_SIZE << PtrVCB->LogBlockSize;
//
// Reading Group Descriptors...
//
if( PtrVCB->LogBlockSize )
{
// First block contains the descriptors...
VolumeByteOffset.QuadPart = LogicalBlockSize;
}
else
{
// Second block contains the descriptors...
VolumeByteOffset.QuadPart = LogicalBlockSize * 2;
}
NumberOfBytesToRead = PtrVCB->NoOfGroups * sizeof( struct ext2_group_desc );
NumberOfBytesToRead = Ext2Align( NumberOfBytesToRead, LogicalBlockSize );
if (!CcMapData( PtrVCB->PtrStreamFileObject,
&VolumeByteOffset,
NumberOfBytesToRead,
TRUE,
&PtrBCB,
&PtrCacheBuffer ))
{
DebugTrace(DEBUG_TRACE_ERROR, "Cache read failiure while reading in volume meta data", 0);
try_return( Status = STATUS_INSUFFICIENT_RESOURCES );
}
else
{
//
// Saving up Often Used Group Descriptor Information in the VCB...
//
unsigned int DescIndex ;
DebugTrace(DEBUG_TRACE_MISC, "Cache hit while reading in volume meta data", 0);
PtrGroupDescriptor = (PEXT2_GROUP_DESCRIPTOR )PtrCacheBuffer;
for( DescIndex = 0; DescIndex < PtrVCB->NoOfGroups; DescIndex++ )
{
PtrVCB->PtrGroupDescriptors[ DescIndex ].InodeTablesBlock
= PtrGroupDescriptor[ DescIndex ].bg_inode_table;
PtrVCB->PtrGroupDescriptors[ DescIndex ].InodeBitmapBlock
= PtrGroupDescriptor[ DescIndex ].bg_inode_bitmap
;
PtrVCB->PtrGroupDescriptors[ DescIndex ].BlockBitmapBlock
= PtrGroupDescriptor[ DescIndex ].bg_block_bitmap
;
PtrVCB->PtrGroupDescriptors[ DescIndex ].FreeBlocksCount
= PtrGroupDescriptor[ DescIndex ].bg_free_blocks_count;
PtrVCB->PtrGroupDescriptors[ DescIndex ].FreeInodesCount
= PtrGroupDescriptor[ DescIndex ].bg_free_inodes_count;
}
CcUnpinData( PtrBCB );
PtrBCB = NULL;
}
//
// 5. Creating a Root Directory FCB
//
PtrRootFileObject = IoCreateStreamFileObject(NULL, TargetDeviceObject );
if( !PtrRootFileObject )
{
try_return();
}
//
// Associate the file stream with the Volume parameter block...
// I do it now
//
PtrRootFileObject->Vpb = PtrVCB->PtrVPB;
PtrRootFileObject->ReadAccess = TRUE;
PtrRootFileObject->WriteAccess = TRUE;
{
PtrExt2ObjectName PtrObjectName;
LARGE_INTEGER ZeroSize;
PtrObjectName = Ext2AllocateObjectName();
RtlInitUnicodeString( &PtrObjectName->ObjectName, L"\\" );
Ext2CopyWideCharToUnicodeString( &PtrObjectName->ObjectName, L"\\" );
ZeroSize.QuadPart = 0;
if ( !NT_SUCCESS( Ext2CreateNewFCB(
&PtrVCB->PtrRootDirectoryFCB, // Root FCB
ZeroSize, // AllocationSize,
ZeroSize, // EndOfFile,
PtrRootFileObject, // The Root Dircetory File Object
PtrVCB,
PtrObjectName ) ) )
{
try_return();
}
PtrVCB->PtrRootDirectoryFCB->FCBFlags |= EXT2_FCB_DIRECTORY | EXT2_FCB_ROOT_DIRECTORY;
}
PtrVCB->PtrRootDirectoryFCB->DcbFcb.Dcb.PtrDirFileObject = PtrRootFileObject;
PtrVCB->PtrRootDirectoryFCB->INodeNo = EXT2_ROOT_INO;
PtrRootFileObject->SectionObjectPointer = &(PtrVCB->PtrRootDirectoryFCB->NTRequiredFCB.SectionObject);
RtlInitUnicodeString( &PtrRootFileObject->FileName, L"\\" );
Ext2InitializeFCBInodeInfo( PtrVCB->PtrRootDirectoryFCB );
//
// Initiating caching for root directory...
//
CcInitializeCacheMap(PtrRootFileObject,
(PCC_FILE_SIZES)(&(PtrVCB->PtrRootDirectoryFCB->NTRequiredFCB.CommonFCBHeader.AllocationSize)),
TRUE, // We will utilize pin access for directories
&(Ext2GlobalData.CacheMgrCallBacks), // callbacks
PtrVCB->PtrRootDirectoryFCB ); // The context used in callbacks
//
// 6. Update the VCB Flags
//
PtrVCB->VCBFlags |= EXT2_VCB_FLAGS_VOLUME_MOUNTED ; // | EXT2_VCB_FLAGS_VOLUME_READ_ONLY;
//
// 7. Mount Success
//
Status = STATUS_SUCCESS;
{
//
// This block is for testing....
// To be removed...
/*
EXT2_INODE Inode ;
Ext2ReadInode( PtrVCB, 100, &Inode );
DebugTrace( DEBUG_TRACE_MISC, "Inode size= %lX [FS Ctrl]", Inode.i_size );
Ext2DeallocInode( NULL, PtrVCB, 0xfb6 );
*/
}
// ObDereferenceObject( TargetDeviceObject );
}
else
{
DebugTrace(DEBUG_TRACE_MOUNT, "Failing mount. Partition not Ext2...", 0);
}
try_exit: NOTHING;
}
finally
{
// Freeing Allocated Memory...
if( SuperBlock != NULL )
{
DebugTrace( DEBUG_TRACE_FREE, "Freeing = %lX [FS Ctrl]", SuperBlock );
ExFreePool( SuperBlock );
}
if( BootSector != NULL )
{
DebugTrace( DEBUG_TRACE_FREE, "Freeing = %lX [FS Ctrl]", BootSector);
ExFreePool( BootSector );
}
// start unwinding if we were unsuccessful
if (!NT_SUCCESS( Status ))
{
}
}
return Status;
}
/*
* NAME: DriverEntry
* FUNCTION: Called by the system to initalize the driver
*
* ARGUMENTS:
* DriverObject = object describing this driver
* RegistryPath = path to our configuration entries
* RETURNS: Success or failure
*/
NTSTATUS
DriverEntry (
IN PDRIVER_OBJECT DriverObject,
IN PUNICODE_STRING RegistryPath
)
{
PDEVICE_OBJECT DiskdevObject = NULL;
PDEVICE_OBJECT CdromdevObject = NULL;
UNICODE_STRING DeviceName;
UNICODE_STRING DosDeviceName;
PFAST_IO_DISPATCH FastIoDispatch;
PCACHE_MANAGER_CALLBACKS CacheManagerCallbacks;
NTSTATUS Status;
int rc = 0;
BOOLEAN linux_lib_inited = FALSE;
BOOLEAN journal_module_inited = FALSE;
/* Verity super block ... */
ASSERT(sizeof(EXT2_SUPER_BLOCK) == 1024);
ASSERT(FIELD_OFFSET(EXT2_SUPER_BLOCK, s_magic) == 56);
DbgPrint(
"Ext2Fsd --"
#ifdef _WIN2K_TARGET_
" Win2k --"
#endif
" Version "
EXT2FSD_VERSION
#if EXT2_DEBUG
" Checked"
#else
" Free"
#endif
" -- "
__DATE__ " "
__TIME__ ".\n");
DEBUG(DL_FUN, ( "Ext2 DriverEntry ...\n"));
/* initialize winlib structures */
if (ext2_init_linux()) {
Status = STATUS_INSUFFICIENT_RESOURCES;
goto errorout;
}
linux_lib_inited = TRUE;
/* initialize journal module structures */
LOAD_MODULE(journal_init);
if (rc != 0) {
Status = STATUS_INSUFFICIENT_RESOURCES;
goto errorout;
}
journal_module_inited = TRUE;
/* allocate memory for Ext2Global */
Ext2Global = Ext2AllocatePool(NonPagedPool, sizeof(EXT2_GLOBAL), 'LG2E');
if (!Ext2Global) {
Status = STATUS_INSUFFICIENT_RESOURCES;
goto errorout;
}
/* initialize Ext2Global */
RtlZeroMemory(Ext2Global, sizeof(EXT2_GLOBAL));
Ext2Global->Identifier.Type = EXT2FGD;
Ext2Global->Identifier.Size = sizeof(EXT2_GLOBAL);
InitializeListHead(&(Ext2Global->VcbList));
ExInitializeResourceLite(&(Ext2Global->Resource));
/* query registry settings */
Ext2QueryRegistrySettings(RegistryPath);
/* create Ext2Fsd cdrom fs deivce */
RtlInitUnicodeString(&DeviceName, CDROM_NAME);
Status = IoCreateDevice(
DriverObject,
0,
&DeviceName,
FILE_DEVICE_CD_ROM_FILE_SYSTEM,
0,
FALSE,
&CdromdevObject );
if (!NT_SUCCESS(Status)) {
DEBUG(DL_ERR, ( "IoCreateDevice cdrom device object error.\n"));
goto errorout;
}
/* create Ext2Fsd disk fs deivce */
RtlInitUnicodeString(&DeviceName, DEVICE_NAME);
Status = IoCreateDevice(
DriverObject,
0,
&DeviceName,
FILE_DEVICE_DISK_FILE_SYSTEM,
0,
FALSE,
&DiskdevObject );
if (!NT_SUCCESS(Status)) {
DEBUG(DL_ERR, ( "IoCreateDevice disk device object error.\n"));
goto errorout;
}
Status= Ext2StartReaper(
&Ext2Global->FcbReaper,
Ext2FcbReaperThread);
if (!NT_SUCCESS(Status)) {
goto errorout;
}
/* start resource reaper thread */
Status= Ext2StartReaper(
&Ext2Global->McbReaper,
Ext2McbReaperThread);
if (!NT_SUCCESS(Status)) {
Ext2StopReaper(&Ext2Global->FcbReaper);
goto errorout;
}
Status= Ext2StartReaper(
&Ext2Global->bhReaper,
Ext2bhReaperThread);
if (!NT_SUCCESS(Status)) {
Ext2StopReaper(&Ext2Global->FcbReaper);
Ext2StopReaper(&Ext2Global->McbReaper);
goto errorout;
}
/* initializing */
Ext2Global->DiskdevObject = DiskdevObject;
Ext2Global->CdromdevObject = CdromdevObject;
DriverObject->MajorFunction[IRP_MJ_CREATE] = Ext2BuildRequest;
DriverObject->MajorFunction[IRP_MJ_CLOSE] = Ext2BuildRequest;
DriverObject->MajorFunction[IRP_MJ_READ] = Ext2BuildRequest;
DriverObject->MajorFunction[IRP_MJ_WRITE] = Ext2BuildRequest;
DriverObject->MajorFunction[IRP_MJ_FLUSH_BUFFERS] = Ext2BuildRequest;
DriverObject->MajorFunction[IRP_MJ_SHUTDOWN] = Ext2BuildRequest;
DriverObject->MajorFunction[IRP_MJ_QUERY_INFORMATION] = Ext2BuildRequest;
DriverObject->MajorFunction[IRP_MJ_SET_INFORMATION] = Ext2BuildRequest;
DriverObject->MajorFunction[IRP_MJ_QUERY_VOLUME_INFORMATION] = Ext2BuildRequest;
DriverObject->MajorFunction[IRP_MJ_SET_VOLUME_INFORMATION] = Ext2BuildRequest;
DriverObject->MajorFunction[IRP_MJ_DIRECTORY_CONTROL] = Ext2BuildRequest;
DriverObject->MajorFunction[IRP_MJ_FILE_SYSTEM_CONTROL] = Ext2BuildRequest;
DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] = Ext2BuildRequest;
DriverObject->MajorFunction[IRP_MJ_LOCK_CONTROL] = Ext2BuildRequest;
DriverObject->MajorFunction[IRP_MJ_CLEANUP] = Ext2BuildRequest;
#if (_WIN32_WINNT >= 0x0500)
DriverObject->MajorFunction[IRP_MJ_PNP] = Ext2BuildRequest;
#endif //(_WIN32_WINNT >= 0x0500)
#if EXT2_UNLOAD
DriverObject->DriverUnload = DriverUnload;
#else
DriverObject->DriverUnload = NULL;
#endif
//
// Initialize the fast I/O entry points
//
FastIoDispatch = &(Ext2Global->FastIoDispatch);
FastIoDispatch->SizeOfFastIoDispatch = sizeof(FAST_IO_DISPATCH);
FastIoDispatch->FastIoCheckIfPossible = Ext2FastIoCheckIfPossible;
FastIoDispatch->FastIoRead = Ext2FastIoRead;
FastIoDispatch->FastIoWrite = Ext2FastIoWrite;
FastIoDispatch->FastIoQueryBasicInfo = Ext2FastIoQueryBasicInfo;
FastIoDispatch->FastIoQueryStandardInfo = Ext2FastIoQueryStandardInfo;
FastIoDispatch->FastIoLock = Ext2FastIoLock;
FastIoDispatch->FastIoUnlockSingle = Ext2FastIoUnlockSingle;
FastIoDispatch->FastIoUnlockAll = Ext2FastIoUnlockAll;
FastIoDispatch->FastIoUnlockAllByKey = Ext2FastIoUnlockAllByKey;
FastIoDispatch->FastIoQueryNetworkOpenInfo = Ext2FastIoQueryNetworkOpenInfo;
FastIoDispatch->AcquireForModWrite = Ext2AcquireFileForModWrite;
FastIoDispatch->ReleaseForModWrite = Ext2ReleaseFileForModWrite;
FastIoDispatch->AcquireForModWrite = Ext2AcquireFileForModWrite;
FastIoDispatch->ReleaseForModWrite = Ext2ReleaseFileForModWrite;
FastIoDispatch->AcquireForCcFlush = Ext2AcquireFileForCcFlush;
FastIoDispatch->ReleaseForCcFlush = Ext2ReleaseFileForCcFlush;
FastIoDispatch->AcquireFileForNtCreateSection = Ext2AcquireForCreateSection;
FastIoDispatch->ReleaseFileForNtCreateSection = Ext2ReleaseForCreateSection;
DriverObject->FastIoDispatch = FastIoDispatch;
//
// initializing structure sizes for statistics
// 1 means flexible/not fixed for all allocations (for different volumes).
//
Ext2Global->PerfStat.Magic = EXT2_PERF_STAT_MAGIC;
Ext2Global->PerfStat.Version = EXT2_PERF_STAT_VER2;
Ext2Global->PerfStat.Length = sizeof(EXT2_PERF_STATISTICS_V2);
Ext2Global->PerfStat.Unit.Slot[PS_IRP_CONTEXT] = sizeof(EXT2_IRP_CONTEXT); /* 0 */
Ext2Global->PerfStat.Unit.Slot[PS_VCB] = sizeof(EXT2_VCB); /* 1 */
Ext2Global->PerfStat.Unit.Slot[PS_FCB] = sizeof(EXT2_FCB); /* 2 */
Ext2Global->PerfStat.Unit.Slot[PS_CCB] = sizeof(EXT2_CCB); /* 3 */
Ext2Global->PerfStat.Unit.Slot[PS_MCB] = sizeof(EXT2_MCB); /* 4 */
Ext2Global->PerfStat.Unit.Slot[PS_EXTENT] = sizeof(EXT2_EXTENT); /* 5 */
Ext2Global->PerfStat.Unit.Slot[PS_RW_CONTEXT] = sizeof(EXT2_RW_CONTEXT); /* 6 */
Ext2Global->PerfStat.Unit.Slot[PS_VPB] = sizeof(VPB); /* 7 */
Ext2Global->PerfStat.Unit.Slot[PS_FILE_NAME] = 1; /* 8 */
Ext2Global->PerfStat.Unit.Slot[PS_MCB_NAME] = 1; /* 9 */
Ext2Global->PerfStat.Unit.Slot[PS_INODE_NAME] = 1; /* a */
Ext2Global->PerfStat.Unit.Slot[PS_DIR_ENTRY] = sizeof(EXT2_DIR_ENTRY2); /* b */
Ext2Global->PerfStat.Unit.Slot[PS_DIR_PATTERN] = 1; /* c */
Ext2Global->PerfStat.Unit.Slot[PS_DISK_EVENT] = sizeof(KEVENT); /* d */
Ext2Global->PerfStat.Unit.Slot[PS_DISK_BUFFER] = 1; /* e */
Ext2Global->PerfStat.Unit.Slot[PS_BLOCK_DATA] = 1; /* f */
Ext2Global->PerfStat.Unit.Slot[PS_EXT2_INODE] = 1; /* 10 */
Ext2Global->PerfStat.Unit.Slot[PS_DENTRY] = sizeof(struct dentry); /* 11 */
Ext2Global->PerfStat.Unit.Slot[PS_BUFF_HEAD] = sizeof(struct buffer_head); /* 12 */
switch ( MmQuerySystemSize() ) {
case MmSmallSystem:
Ext2Global->MaxDepth = 64;
break;
case MmMediumSystem:
Ext2Global->MaxDepth = 128;
break;
case MmLargeSystem:
Ext2Global->MaxDepth = 256;
break;
}
//
// Initialize the Cache Manager callbacks
//
CacheManagerCallbacks = &(Ext2Global->CacheManagerCallbacks);
CacheManagerCallbacks->AcquireForLazyWrite = Ext2AcquireForLazyWrite;
CacheManagerCallbacks->ReleaseFromLazyWrite = Ext2ReleaseFromLazyWrite;
CacheManagerCallbacks->AcquireForReadAhead = Ext2AcquireForReadAhead;
CacheManagerCallbacks->ReleaseFromReadAhead = Ext2ReleaseFromReadAhead;
Ext2Global->CacheManagerNoOpCallbacks.AcquireForLazyWrite = Ext2NoOpAcquire;
Ext2Global->CacheManagerNoOpCallbacks.ReleaseFromLazyWrite = Ext2NoOpRelease;
Ext2Global->CacheManagerNoOpCallbacks.AcquireForReadAhead = Ext2NoOpAcquire;
Ext2Global->CacheManagerNoOpCallbacks.ReleaseFromReadAhead = Ext2NoOpRelease;
#ifndef _WIN2K_TARGET_
//
// Initialize FS Filter callbacks
//
RtlZeroMemory(&Ext2Global->FilterCallbacks, sizeof(FS_FILTER_CALLBACKS));
Ext2Global->FilterCallbacks.SizeOfFsFilterCallbacks = sizeof(FS_FILTER_CALLBACKS);
Ext2Global->FilterCallbacks.PreAcquireForSectionSynchronization = Ext2PreAcquireForCreateSection;
FsRtlRegisterFileSystemFilterCallbacks(DriverObject, &Ext2Global->FilterCallbacks );
#endif
//
// Initialize the global data
//
ExInitializeNPagedLookasideList( &(Ext2Global->Ext2IrpContextLookasideList),
NULL,
NULL,
0,
sizeof(EXT2_IRP_CONTEXT),
'PRIE',
0 );
ExInitializeNPagedLookasideList( &(Ext2Global->Ext2FcbLookasideList),
NULL,
NULL,
0,
sizeof(EXT2_FCB),
'BCFE',
0 );
ExInitializeNPagedLookasideList( &(Ext2Global->Ext2CcbLookasideList),
NULL,
NULL,
0,
sizeof(EXT2_CCB),
'BCCE',
0 );
ExInitializeNPagedLookasideList( &(Ext2Global->Ext2McbLookasideList),
NULL,
NULL,
0,
sizeof(EXT2_MCB),
'BCME',
0 );
ExInitializeNPagedLookasideList( &(Ext2Global->Ext2ExtLookasideList),
NULL,
NULL,
0,
sizeof(EXT2_EXTENT),
'STXE',
0 );
ExInitializeNPagedLookasideList( &(Ext2Global->Ext2DentryLookasideList),
NULL,
NULL,
0,
sizeof(struct dentry),
'TNED',
0 );
RtlInitUnicodeString(&DosDeviceName, DOS_DEVICE_NAME);
IoCreateSymbolicLink(&DosDeviceName, &DeviceName);
#if EXT2_DEBUG
ProcessNameOffset = Ext2GetProcessNameOffset();
#endif
Ext2LoadAllNls();
Ext2Global->Codepage.PageTable =
load_nls(Ext2Global->Codepage.AnsiName);
/* register file system devices for disk and cdrom */
IoRegisterFileSystem(DiskdevObject);
ObReferenceObject(DiskdevObject);
IoRegisterFileSystem(CdromdevObject);
ObReferenceObject(CdromdevObject);
errorout:
if (!NT_SUCCESS(Status)) {
/*
* stop reaper thread ...
*/
/*
* cleanup resources ...
*/
if (Ext2Global) {
ExDeleteResourceLite(&Ext2Global->Resource);
Ext2FreePool(Ext2Global, 'LG2E');
}
if (CdromdevObject) {
IoDeleteDevice(CdromdevObject);
}
if (DiskdevObject) {
IoDeleteDevice(DiskdevObject);
}
if (journal_module_inited) {
/* cleanup journal related caches */
UNLOAD_MODULE(journal_exit);
}
if (linux_lib_inited) {
/* cleanup linux lib */
ext2_destroy_linux();
}
}
return Status;
}
BOOLEAN
Ext2QueryRegistrySettings(IN PUNICODE_STRING RegistryPath)
{
UNICODE_STRING ParameterPath;
UNICODE_STRING UniName;
ANSI_STRING AnsiName;
ULONG WritingSupport = 0;
ULONG CheckingBitmap = 0;
ULONG Ext3ForceWriting = 0;
ULONG AutoMount = 0;
WCHAR UniBuffer[CODEPAGE_MAXLEN];
USHORT Buffer[HIDINGPAT_LEN];
NTSTATUS Status;
ParameterPath.Length = 0;
ParameterPath.MaximumLength =
RegistryPath->Length + sizeof(PARAMETERS_KEY) + sizeof(WCHAR);
ParameterPath.Buffer =
(PWSTR) Ext2AllocatePool(
PagedPool,
ParameterPath.MaximumLength,
'LG2E'
);
if (!ParameterPath.Buffer) {
DbgBreak();
DEBUG(DL_ERR, ( "Ex2QueryParameters: failed to allocate Parameters...\n"));
return FALSE;
}
RtlCopyUnicodeString(&ParameterPath, RegistryPath);
RtlAppendUnicodeToString(&ParameterPath, PARAMETERS_KEY);
/* enable automount of ext2/3/4 volumes */
SetLongFlag(Ext2Global->Flags, EXT2_AUTO_MOUNT);
/* query parameter settings from registry */
Ext2QueryGlobalParameters(&ParameterPath);
/* set global codepage settings */
if (wcslen(&Ext2Global->Codepage.PageName[0])) {
UniName.Length = sizeof(WCHAR) * wcslen(&Ext2Global->Codepage.PageName[0]);
UniName.MaximumLength = CODEPAGE_MAXLEN * sizeof(WCHAR);
UniName.Buffer = &Ext2Global->Codepage.PageName[0];
AnsiName.MaximumLength = CODEPAGE_MAXLEN;
AnsiName.Length = 0;
AnsiName.Buffer = &Ext2Global->Codepage.AnsiName[0];
Status = RtlUnicodeStringToAnsiString(
&AnsiName,
&UniName,
FALSE);
if (!NT_SUCCESS(Status)) {
DEBUG(DL_ERR, ( "Ext2QueryParameters: Wrong CodePage %wZ ...\n", &UniName));
RtlCopyMemory(&(Ext2Global->Codepage.AnsiName[0]),"default\0", 8);
}
} else {
DEBUG(DL_ERR, ( "Ext2QueryParameters: CodePage not specified.\n"));
RtlCopyMemory(&(Ext2Global->Codepage.AnsiName[0]),"default\0", 8);
}
Ext2Global->Codepage.AnsiName[CODEPAGE_MAXLEN - 1] = 0;
/* set global hidden prefix pattern */
if (wcslen(&Ext2Global->wHidingPrefix[0])) {
UniName.Length = sizeof(WCHAR) * wcslen(&Ext2Global->wHidingPrefix[0]);
UniName.MaximumLength = HIDINGPAT_LEN * sizeof(WCHAR);
UniName.Buffer = &Ext2Global->wHidingPrefix[0];
AnsiName.MaximumLength = HIDINGPAT_LEN;
AnsiName.Length = 0;
AnsiName.Buffer = &(Ext2Global->sHidingPrefix[0]);
Status = RtlUnicodeStringToAnsiString(
&AnsiName,
&UniName,
FALSE);
if (NT_SUCCESS(Status)) {
Ext2Global->bHidingPrefix = TRUE;
} else {
DEBUG(DL_ERR, ( "Ext2QueryParameters: Wrong HidingPrefix ...\n"));
}
} else {
DEBUG(DL_ERR, ( "Ext2QueryParameters: HidingPrefix not specified.\n"));
}
Ext2Global->sHidingPrefix[HIDINGPAT_LEN - 1] = 0;
/* set global hidden suffix pattern */
if (wcslen(&Ext2Global->wHidingSuffix[0])) {
UniName.Length = sizeof(WCHAR) * wcslen(&Ext2Global->wHidingSuffix[0]);
UniName.MaximumLength = HIDINGPAT_LEN * sizeof(WCHAR);
UniName.Buffer = &Ext2Global->wHidingSuffix[0];
AnsiName.MaximumLength = HIDINGPAT_LEN;
AnsiName.Length = 0;
AnsiName.Buffer = &(Ext2Global->sHidingSuffix[0]);
Status = RtlUnicodeStringToAnsiString(
&AnsiName,
&UniName,
FALSE);
if (NT_SUCCESS(Status)) {
Ext2Global->bHidingSuffix = TRUE;
} else {
DEBUG(DL_ERR, ( "Ext2QueryParameters: Wrong HidingSuffix ...\n"));
}
} else {
DEBUG(DL_ERR, ( "Ext2QueryParameters: HidingSuffix not specified.\n"));
}
Ext2Global->sHidingPrefix[HIDINGPAT_LEN - 1] = 0;
Ext2Global->RegistryPath.Buffer = ParameterPath.Buffer;
Ext2Global->RegistryPath.Length = 0;
Ext2Global->RegistryPath.MaximumLength = ParameterPath.MaximumLength;
RtlCopyUnicodeString(&Ext2Global->RegistryPath, RegistryPath);
RtlAppendUnicodeToString(&Ext2Global->RegistryPath, VOLUMES_KEY);
return TRUE;
}
/*************************************************************************
*
* Function: Ext2PassDownMultiReadWriteIRP()
*
* Description:
* pass down multiple read IRPs as Associated IRPs
*
* Expected Interrupt Level (for execution) :
*
* ?
*
* Return Value: STATUS_SUCCESS / STATUS_PENDING / Error
*
*************************************************************************/
NTSTATUS NTAPI Ext2PassDownMultiReadWriteIRP(
PEXT2_IO_RUN PtrIoRuns,
UINT Count,
ULONG TotalReadWriteLength,
PtrExt2IrpContext PtrIrpContext,
PtrExt2FCB PtrFCB,
BOOLEAN SynchronousIo)
{
PIRP PtrMasterIrp;
PIRP PtrAssociatedIrp;
PIO_STACK_LOCATION PtrIrpSp;
PMDL PtrMdl;
PtrExt2VCB PtrVCB;
UINT i;
ULONG BufferOffset;
PEXT2_IO_CONTEXT PtrIoContext = NULL;
PKEVENT PtrSyncEvent = NULL;
ULONG LogicalBlockSize;
ULONG ReadWriteLength;
NTSTATUS RC = STATUS_SUCCESS;
PtrVCB = PtrFCB->PtrVCB;
PtrMasterIrp = PtrIrpContext->Irp;
LogicalBlockSize = EXT2_MIN_BLOCK_SIZE << PtrVCB->LogBlockSize;
try
{
if( !SynchronousIo )
{
IoMarkIrpPending( PtrIrpContext->Irp );
// We will be returning STATUS_PENDING...
}
if( !PtrMasterIrp->MdlAddress )
{
Ext2LockCallersBuffer( PtrMasterIrp, TRUE, TotalReadWriteLength );
}
if( SynchronousIo )
{
PtrSyncEvent = Ext2AllocatePool(NonPagedPool, Ext2QuadAlign( sizeof(KEVENT) ) );
if ( !PtrSyncEvent )
{
RC = STATUS_INSUFFICIENT_RESOURCES;
try_return();
}
KeInitializeEvent( PtrSyncEvent, SynchronizationEvent, FALSE );
}
//
// Allocate and initialize a completion context
//
PtrIoContext = Ext2AllocatePool(NonPagedPool, Ext2QuadAlign( sizeof(EXT2_IO_CONTEXT) ) );
if ( !PtrIoContext )
{
RC = STATUS_INSUFFICIENT_RESOURCES;
try_return();
}
RtlZeroMemory( PtrIoContext, sizeof(EXT2_IO_CONTEXT) );
PtrIoContext->Count = Count;
PtrIoContext->NodeIdentifier.NodeType = EXT2_NODE_TYPE_IO_CONTEXT;
PtrIoContext->NodeIdentifier.NodeSize = sizeof( EXT2_IO_CONTEXT );
PtrIoContext->PtrMasterIrp = PtrMasterIrp;
PtrIoContext->PtrSyncEvent = PtrSyncEvent;
PtrIoContext->ReadWriteLength = TotalReadWriteLength;
for( ReadWriteLength = 0, BufferOffset = 0, i = 0; i < Count; i++, BufferOffset += ReadWriteLength )
{
ReadWriteLength = PtrIoRuns[ i].EndOffset - PtrIoRuns[ i].StartOffset;
//
// Allocating an Associated IRP...
//
PtrAssociatedIrp = IoMakeAssociatedIrp( PtrMasterIrp,
(CCHAR) (PtrVCB->TargetDeviceObject->StackSize + 1 ) );
PtrIoRuns[ i].PtrAssociatedIrp = PtrAssociatedIrp;
ASSERT ( PtrAssociatedIrp );
PtrMasterIrp->AssociatedIrp.IrpCount ++;
//
// Allocating a Memory Descriptor List...
//
PtrMdl = IoAllocateMdl( (PCHAR) PtrMasterIrp->UserBuffer + BufferOffset, // Virtual Address
ReadWriteLength, FALSE, FALSE, PtrAssociatedIrp );
//
// and building a partial MDL...
//
IoBuildPartialMdl( PtrMasterIrp->MdlAddress,
PtrMdl, (PCHAR)PtrMasterIrp->UserBuffer + BufferOffset, ReadWriteLength );
//
// Create an Irp stack location for ourselves...
//
IoSetNextIrpStackLocation( PtrAssociatedIrp );
PtrIrpSp = IoGetCurrentIrpStackLocation( PtrAssociatedIrp );
//
// Setup the Stack location to describe our read.
//
PtrIrpSp->MajorFunction = PtrIrpContext->MajorFunction;
if( PtrIrpContext->MajorFunction == IRP_MJ_READ )
{
PtrIrpSp->Parameters.Read.Length = ReadWriteLength;
PtrIrpSp->Parameters.Read.ByteOffset.QuadPart =
PtrIoRuns[i].LogicalBlock * ( LogicalBlockSize );
}
else if( PtrIrpContext->MajorFunction == IRP_MJ_WRITE )
{
PtrIrpSp->Parameters.Write.Length = ReadWriteLength;
PtrIrpSp->Parameters.Write.ByteOffset.QuadPart =
PtrIoRuns[i].LogicalBlock * ( LogicalBlockSize );
}
// PtrIrpSp->Parameters.Read.Length = ReadWriteLength;
// PtrIrpSp->Parameters.Read.ByteOffset.QuadPart = PtrIoRuns[i].LogicalBlock;
//
// Setup a completion routine...
//
IoSetCompletionRoutine( PtrAssociatedIrp,
SynchronousIo ?
Ext2MultiSyncCompletionRoutine :
Ext2MultiAsyncCompletionRoutine,
PtrIoContext, TRUE, TRUE, TRUE );
//
// Initialise the next stack location for the driver below us to use...
//
PtrIrpSp = IoGetNextIrpStackLocation( PtrAssociatedIrp );
PtrIrpSp->MajorFunction = PtrIrpContext->MajorFunction;
if( PtrIrpContext->MajorFunction == IRP_MJ_READ )
{
PtrIrpSp->Parameters.Read.Length = ReadWriteLength;
PtrIrpSp->Parameters.Read.ByteOffset.QuadPart = PtrIoRuns[i].LogicalBlock * ( LogicalBlockSize );
}
else if( PtrIrpContext->MajorFunction == IRP_MJ_WRITE )
{
PtrIrpSp->Parameters.Write.Length = ReadWriteLength;
PtrIrpSp->Parameters.Write.ByteOffset.QuadPart = PtrIoRuns[i].LogicalBlock * ( LogicalBlockSize );
}
// PtrIrpSp->Parameters.Read.Length = ReadWriteLength;
// PtrIrpSp->Parameters.Read.ByteOffset.QuadPart =
// PtrIoRuns[i].LogicalBlock * ( LogicalBlockSize );
}
for( i = 0; i < Count; i++ ) {
// DbgPrint("PASSING DOWN IRP %d TO TARGET DEVICE\n", i);
IoCallDriver( PtrVCB->TargetDeviceObject, PtrIoRuns[ i].PtrAssociatedIrp );
}
if( SynchronousIo )
{
//
// Synchronous IO
// Wait for the IO to complete...
//
DbgPrint("DEADLY WAIT (%d)\n", KeGetCurrentIrql());
KeWaitForSingleObject( PtrSyncEvent,
Executive, KernelMode, FALSE, (PLARGE_INTEGER)NULL );
DbgPrint("DEADLY WAIT DONE\n");
try_return();
}
else
{
// Asynchronous IO...
RC = STATUS_PENDING;
try_return();
}
try_exit: NOTHING;
}
finally
{
if( PtrSyncEvent )
{
DebugTrace( DEBUG_TRACE_FREE, "Freeing = %lX [io]", PtrSyncEvent );
ExFreePool( PtrSyncEvent );
}
if( PtrIoContext && ! ( RC == STATUS_PENDING || RC == STATUS_SUCCESS ) )
{
//
// This means we are getting out of
// this function without doing a read
// due to an error, maybe...
//
DebugTrace( DEBUG_TRACE_FREE, "Freeing = %lX [io]", PtrIoContext);
ExFreePool( PtrIoContext );
}
}
return(RC);
}
NTSTATUS NTAPI Ext2PassDownSingleReadWriteIRP(
PtrExt2IrpContext PtrIrpContext,
PIRP PtrIrp,
PtrExt2VCB PtrVCB,
LARGE_INTEGER ByteOffset,
uint32 ReadWriteLength,
BOOLEAN SynchronousIo)
{
NTSTATUS RC = STATUS_SUCCESS;
PEXT2_IO_CONTEXT PtrIoContext = NULL;
PKEVENT PtrSyncEvent = NULL;
PIO_STACK_LOCATION PtrIrpNextSp = NULL;
try
{
if( !PtrIrp->MdlAddress )
{
Ext2LockCallersBuffer( PtrIrp, TRUE, ReadWriteLength );
}
if( SynchronousIo )
{
PtrSyncEvent = Ext2AllocatePool( NonPagedPool, Ext2QuadAlign( sizeof(KEVENT) ) );
if ( !PtrSyncEvent )
{
RC = STATUS_INSUFFICIENT_RESOURCES;
try_return();
}
KeInitializeEvent( PtrSyncEvent, SynchronizationEvent, FALSE );
}
//
// Allocate and initialize a completion context
//
PtrIoContext = Ext2AllocatePool(NonPagedPool, Ext2QuadAlign( sizeof(EXT2_IO_CONTEXT) ) );
if ( !PtrIoContext )
{
RC = STATUS_INSUFFICIENT_RESOURCES;
try_return();
}
RtlZeroMemory( PtrIoContext, sizeof(EXT2_IO_CONTEXT) );
PtrIoContext->Count = 1;
PtrIoContext->NodeIdentifier.NodeType = EXT2_NODE_TYPE_IO_CONTEXT;
PtrIoContext->NodeIdentifier.NodeSize = sizeof( EXT2_IO_CONTEXT );
PtrIoContext->PtrMasterIrp = NULL;
PtrIoContext->PtrSyncEvent = PtrSyncEvent;
PtrIoContext->ReadWriteLength = ReadWriteLength;
IoSetCompletionRoutine( PtrIrp,
SynchronousIo ?
Ext2SingleSyncCompletionRoutine:
Ext2SingleAsyncCompletionRoutine,
PtrIoContext, TRUE, TRUE, TRUE );
//
// Setup the next IRP stack location in the associated Irp for the disk
// driver beneath us.
//
PtrIrpNextSp = IoGetNextIrpStackLocation( PtrIrp );
//
// Setup the Stack location to do a read from the disk driver.
//
PtrIrpNextSp->MajorFunction = PtrIrpContext->MajorFunction;
if( PtrIrpContext->MajorFunction == IRP_MJ_READ )
{
PtrIrpNextSp->Parameters.Read.Length = ReadWriteLength;
PtrIrpNextSp->Parameters.Read.ByteOffset = ByteOffset;
}
else if( PtrIrpContext->MajorFunction == IRP_MJ_WRITE )
{
PtrIrpNextSp->Parameters.Write.Length = ReadWriteLength;
PtrIrpNextSp->Parameters.Write.ByteOffset = ByteOffset;
}
//
// Issue the read / write request
//
RC = IoCallDriver(PtrVCB->TargetDeviceObject, PtrIrp);
if( SynchronousIo )
{
//
// Wait for completion...
//
RC = KeWaitForSingleObject( &PtrIoContext->PtrSyncEvent,
Executive, KernelMode, FALSE, (PLARGE_INTEGER)NULL );
RC = STATUS_SUCCESS;
}
else
{
RC = STATUS_PENDING;
}
try_exit: NOTHING;
}
finally
{
if( PtrSyncEvent )
{
DebugTrace( DEBUG_TRACE_FREE, "Freeing = %lX [io]", PtrSyncEvent );
ExFreePool( PtrSyncEvent );
}
if( PtrIoContext && !( RC == STATUS_PENDING || RC == STATUS_SUCCESS ) )
{
//
// This means we are getting out of
// this function without doing a read / write
// due to an error, maybe...
//
DebugTrace( DEBUG_TRACE_FREE, "Freeing = %lX [io]", PtrIoContext );
ExFreePool( PtrIoContext );
}
}
return RC;
}
BOOLEAN
Ext2QueryGlobalParameters( IN PUNICODE_STRING RegistryPath)
{
NTSTATUS Status;
UNICODE_STRING ParameterPath;
RTL_QUERY_REGISTRY_TABLE QueryTable[2];
ULONG WritingSupport = 0;
ULONG CheckingBitmap = 0;
ULONG Ext3ForceWriting = 0;
ULONG AutoMount = 0;
UNICODE_STRING UniName;
ANSI_STRING AnsiName;
WCHAR UniBuffer[CODEPAGE_MAXLEN];
USHORT Buffer[HIDINGPAT_LEN];
ParameterPath.Length = 0;
ParameterPath.MaximumLength =
RegistryPath->Length + sizeof(PARAMETERS_KEY) + sizeof(WCHAR);
ParameterPath.Buffer =
(PWSTR) Ext2AllocatePool(
PagedPool,
ParameterPath.MaximumLength,
'LG2E'
);
if (!ParameterPath.Buffer) {
DbgBreak();
DEBUG(DL_ERR, ( "Ex2QueryParameters: failed to allocate Parameters...\n"));
return FALSE;
}
RtlCopyUnicodeString(&ParameterPath, RegistryPath);
RtlAppendUnicodeToString(&ParameterPath, PARAMETERS_KEY);
/* querying value of WritingSupport */
RtlZeroMemory(&QueryTable[0], sizeof(RTL_QUERY_REGISTRY_TABLE) * 2);
QueryTable[0].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_QUERY_REGISTRY_REQUIRED;
QueryTable[0].Name = WRITING_SUPPORT;
QueryTable[0].EntryContext = &WritingSupport;
Status = RtlQueryRegistryValues(
RTL_REGISTRY_ABSOLUTE,
ParameterPath.Buffer,
&QueryTable[0],
NULL,
NULL );
DEBUG(DL_ERR, ( "Ext2QueryParameters: WritingSupport=%xh\n", WritingSupport));
/* querying value of CheckingBitmap */
RtlZeroMemory(&QueryTable[0], sizeof(RTL_QUERY_REGISTRY_TABLE) * 2);
QueryTable[0].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_QUERY_REGISTRY_REQUIRED;
QueryTable[0].Name = CHECKING_BITMAP;
QueryTable[0].EntryContext = &CheckingBitmap;
Status = RtlQueryRegistryValues(
RTL_REGISTRY_ABSOLUTE,
ParameterPath.Buffer,
&QueryTable[0],
NULL,
NULL );
DEBUG(DL_ERR, ( "Ext2QueryParameters: CheckingBitmap=%xh\n", CheckingBitmap));
/* querying value of Ext3ForceWriting */
RtlZeroMemory(&QueryTable[0], sizeof(RTL_QUERY_REGISTRY_TABLE) * 2);
QueryTable[0].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_QUERY_REGISTRY_REQUIRED;
QueryTable[0].Name = EXT3_FORCEWRITING;
QueryTable[0].EntryContext = &Ext3ForceWriting;
Status = RtlQueryRegistryValues(
RTL_REGISTRY_ABSOLUTE,
ParameterPath.Buffer,
&QueryTable[0],
NULL,
NULL );
DEBUG(DL_ERR, ( "Ext2QueryParameters: Ext3ForceWriting=%xh\n", Ext3ForceWriting));
/* querying value of AutoMount */
RtlZeroMemory(&QueryTable[0], sizeof(RTL_QUERY_REGISTRY_TABLE) * 2);
QueryTable[0].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_QUERY_REGISTRY_REQUIRED;
QueryTable[0].Name = AUTO_MOUNT;
QueryTable[0].EntryContext = &AutoMount;
Status = RtlQueryRegistryValues(
RTL_REGISTRY_ABSOLUTE,
ParameterPath.Buffer,
&QueryTable[0],
NULL,
NULL );
SetLongFlag(Ext2Global->Flags, EXT2_AUTO_MOUNT);
if (NT_SUCCESS(Status) && AutoMount == 0) {
ClearLongFlag(Ext2Global->Flags, EXT2_AUTO_MOUNT);
}
DEBUG(DL_ERR, ( "Ext2QueryParameters: AutoMount=%xh\n", AutoMount));
/* querying codepage */
RtlZeroMemory(&QueryTable[0], sizeof(RTL_QUERY_REGISTRY_TABLE) * 2);
QueryTable[0].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_QUERY_REGISTRY_REQUIRED;
QueryTable[0].Name = CODEPAGE_NAME;
QueryTable[0].EntryContext = &(UniName);
UniName.MaximumLength = CODEPAGE_MAXLEN * sizeof(WCHAR);
UniName.Length = 0;
UniName.Buffer = (PWSTR)UniBuffer;
Status = RtlQueryRegistryValues(
RTL_REGISTRY_ABSOLUTE,
ParameterPath.Buffer,
&QueryTable[0],
NULL,
NULL );
if (NT_SUCCESS(Status)) {
DEBUG(DL_ERR, ( "Ext2QueryParameters: Ext2CodePage=%wZ\n", &UniName));
AnsiName.MaximumLength = CODEPAGE_MAXLEN;
AnsiName.Length = 0;
AnsiName.Buffer = &(Ext2Global->Codepage.AnsiName[0]);
Status = RtlUnicodeStringToAnsiString(
&AnsiName,
&UniName,
FALSE);
if (!NT_SUCCESS(Status)) {
DEBUG(DL_ERR, ( "Ext2QueryParameters: Wrong CodePage %wZ ...\n", &UniName));
RtlCopyMemory(&(Ext2Global->Codepage.AnsiName[0]),"default\0", 8);
}
} else {
DEBUG(DL_ERR, ( "Ext2QueryParameters: CodePage not specified.\n"));
RtlCopyMemory(&(Ext2Global->Codepage.AnsiName[0]),"default\0", 8);
}
Ext2Global->Codepage.AnsiName[CODEPAGE_MAXLEN - 1] = 0;
/* querying name hiding patterns: prefix*/
RtlZeroMemory(&QueryTable[0], sizeof(RTL_QUERY_REGISTRY_TABLE) * 2);
QueryTable[0].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_QUERY_REGISTRY_REQUIRED;
QueryTable[0].Name = HIDING_PREFIX;
QueryTable[0].EntryContext = &(UniName);
UniName.MaximumLength = HIDINGPAT_LEN * sizeof(WCHAR);
UniName.Length = 0;
UniName.Buffer = Buffer;
Status = RtlQueryRegistryValues(
RTL_REGISTRY_ABSOLUTE,
ParameterPath.Buffer,
&QueryTable[0],
NULL,
NULL );
if (NT_SUCCESS(Status)) {
DEBUG(DL_ERR, ( "Ext2QueryParameters: HidingPrefix=%wZ\n", &UniName));
AnsiName.MaximumLength =HIDINGPAT_LEN;
AnsiName.Length = 0;
AnsiName.Buffer = &(Ext2Global->sHidingPrefix[0]);
Status = RtlUnicodeStringToAnsiString(
&AnsiName,
&UniName,
FALSE);
if (NT_SUCCESS(Status)) {
Ext2Global->bHidingPrefix = TRUE;
} else {
DEBUG(DL_ERR, ( "Ext2QueryParameters: Wrong HidingPrefix ...\n"));
}
} else {
DEBUG(DL_ERR, ( "Ext2QueryParameters: HidingPrefix not specified.\n"));
}
Ext2Global->sHidingPrefix[HIDINGPAT_LEN - 1] = 0;
/* querying name hiding patterns: suffix */
RtlZeroMemory(&QueryTable[0], sizeof(RTL_QUERY_REGISTRY_TABLE) * 2);
QueryTable[0].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_QUERY_REGISTRY_REQUIRED;
QueryTable[0].Name = HIDING_SUFFIX;
QueryTable[0].EntryContext = &(UniName);
UniName.MaximumLength = HIDINGPAT_LEN * sizeof(WCHAR);
UniName.Length = 0;
UniName.Buffer = Buffer;
Status = RtlQueryRegistryValues(
RTL_REGISTRY_ABSOLUTE,
ParameterPath.Buffer,
&QueryTable[0],
NULL,
NULL
);
if (NT_SUCCESS(Status)) {
DEBUG(DL_ERR, ( "Ext2QueryParameters: HidingSuffix=%wZ\n", &UniName));
AnsiName.MaximumLength = HIDINGPAT_LEN;
AnsiName.Length = 0;
AnsiName.Buffer = &(Ext2Global->sHidingSuffix[0]);
Status = RtlUnicodeStringToAnsiString(
&AnsiName,
&UniName,
FALSE);
if (NT_SUCCESS(Status)) {
Ext2Global->bHidingSuffix = TRUE;
} else {
DEBUG(DL_ERR, ( "Ext2QueryParameters: Wrong HidingSuffix ...\n"));
}
} else {
DEBUG(DL_ERR, ( "Ext2QueryParameters: HidingSuffix not specified.\n"));
}
Ext2Global->sHidingPrefix[HIDINGPAT_LEN - 1] = 0;
{
if (WritingSupport) {
SetLongFlag(Ext2Global->Flags, EXT2_SUPPORT_WRITING);
} else {
ClearLongFlag(Ext2Global->Flags, EXT2_SUPPORT_WRITING);
}
if (CheckingBitmap) {
SetLongFlag(Ext2Global->Flags, EXT2_CHECKING_BITMAP);
} else {
ClearLongFlag(Ext2Global->Flags, EXT2_CHECKING_BITMAP);
}
if (Ext3ForceWriting) {
DbgPrint("Ext2Fsd -- Warning: Ext3ForceWriting enabled !!!\n");
SetLongFlag(Ext2Global->Flags, EXT3_FORCE_WRITING);
SetLongFlag(Ext2Global->Flags, EXT2_SUPPORT_WRITING);
} else {
ClearLongFlag(Ext2Global->Flags, EXT3_FORCE_WRITING);
}
}
Ext2Global->RegistryPath.Buffer = ParameterPath.Buffer;
Ext2Global->RegistryPath.Length = 0;
Ext2Global->RegistryPath.MaximumLength = ParameterPath.MaximumLength;
RtlCopyUnicodeString(&Ext2Global->RegistryPath, RegistryPath);
RtlAppendUnicodeToString(&Ext2Global->RegistryPath, VOLUMES_KEY);
return TRUE;
}
NTSTATUS
Ext2ReadSync(
IN PEXT2_VCB Vcb,
IN ULONGLONG Offset,
IN ULONG Length,
OUT PVOID Buffer,
BOOLEAN bVerify
)
{
PKEVENT Event = NULL;
PIRP Irp;
IO_STATUS_BLOCK IoStatus;
NTSTATUS Status = STATUS_INSUFFICIENT_RESOURCES;
ASSERT(Vcb != NULL);
ASSERT(Vcb->TargetDeviceObject != NULL);
ASSERT(Buffer != NULL);
__try {
Event = Ext2AllocatePool(NonPagedPool, sizeof(KEVENT), 'EK2E');
if (NULL == Event) {
DEBUG(DL_ERR, ( "Ex2ReadSync: failed to allocate Event.\n"));
__leave;
}
INC_MEM_COUNT(PS_DISK_EVENT, Event, sizeof(KEVENT));
KeInitializeEvent(Event, NotificationEvent, FALSE);
Irp = IoBuildSynchronousFsdRequest(
IRP_MJ_READ,
Vcb->TargetDeviceObject,
Buffer,
Length,
(PLARGE_INTEGER)(&Offset),
Event,
&IoStatus
);
if (!Irp) {
Status = STATUS_INSUFFICIENT_RESOURCES;
__leave;
}
if (bVerify) {
SetFlag( IoGetNextIrpStackLocation(Irp)->Flags,
SL_OVERRIDE_VERIFY_VOLUME );
}
Status = IoCallDriver(Vcb->TargetDeviceObject, Irp);
if (Status == STATUS_PENDING) {
KeWaitForSingleObject(
Event,
Suspended,
KernelMode,
FALSE,
NULL
);
Status = IoStatus.Status;
}
} __finally {
if (Event) {
Ext2FreePool(Event, 'EK2E');
DEC_MEM_COUNT(PS_DISK_EVENT, Event, sizeof(KEVENT));
}
}
return Status;
}
NTSTATUS
Ext2ReadWriteBlocks(
IN PEXT2_IRP_CONTEXT IrpContext,
IN PEXT2_VCB Vcb,
IN PEXT2_EXTENT Chain,
IN ULONG Length
)
{
PIRP Irp;
PIRP MasterIrp = IrpContext->Irp;
PIO_STACK_LOCATION IrpSp;
PMDL Mdl;
PEXT2_RW_CONTEXT pContext = NULL;
PEXT2_EXTENT Extent;
KEVENT Wait;
NTSTATUS Status = STATUS_SUCCESS;
BOOLEAN bMasterCompleted = FALSE;
BOOLEAN bBugCheck = FALSE;
ASSERT(MasterIrp);
__try {
pContext = Ext2AllocatePool(NonPagedPool, sizeof(EXT2_RW_CONTEXT), EXT2_RWC_MAGIC);
if (!pContext) {
DEBUG(DL_ERR, ( "Ex2ReadWriteBlocks: failed to allocate pContext.\n"));
Status = STATUS_INSUFFICIENT_RESOURCES;
__leave;
}
INC_MEM_COUNT(PS_RW_CONTEXT, pContext, sizeof(EXT2_RW_CONTEXT));
RtlZeroMemory(pContext, sizeof(EXT2_RW_CONTEXT));
pContext->Wait = Ext2CanIWait();
pContext->MasterIrp = MasterIrp;
pContext->Length = Length;
if (IrpContext->MajorFunction == IRP_MJ_WRITE) {
SetFlag(pContext->Flags, EXT2_RW_CONTEXT_WRITE);
}
if (pContext->Wait) {
KeInitializeEvent(&(pContext->Event), NotificationEvent, FALSE);
} else if (IrpContext->Fcb->Identifier.Type == EXT2FCB) {
if (IsFlagOn(MasterIrp->Flags, IRP_PAGING_IO)) {
pContext->Resource = &IrpContext->Fcb->PagingIoResource;
} else {
pContext->Resource = &IrpContext->Fcb->MainResource;
}
pContext->FileObject = IrpContext->FileObject;
pContext->ThreadId = ExGetCurrentResourceThread();
}
if (NULL == Chain->Next && 0 == Chain->Offset) {
/* we get only 1 extent to dispatch, then don't bother allocating new irps */
/* setup the Stack location to do a read from the disk driver. */
IrpSp = IoGetNextIrpStackLocation(MasterIrp);
IrpSp->MajorFunction = IrpContext->MajorFunction;
IrpSp->Parameters.Read.Length = Chain->Length;
IrpSp->Parameters.Read.ByteOffset.QuadPart = Chain->Lba;
if (IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_THROUGH)) {
SetFlag(IrpSp->Flags, SL_WRITE_THROUGH);
}
if (IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_VERIFY_READ)) {
SetFlag(IrpSp->Flags, SL_OVERRIDE_VERIFY_VOLUME);
}
IoSetCompletionRoutine(
MasterIrp,
Ext2CanIWait() ?
Ext2ReadWriteBlockSyncCompletionRoutine :
Ext2ReadWriteBlockAsyncCompletionRoutine,
(PVOID) pContext,
TRUE,
TRUE,
TRUE );
/* intialize context block */
Chain->Irp = MasterIrp;
pContext->Blocks = 1;
} else {
for (Extent = Chain; Extent != NULL; Extent = Extent->Next) {
Irp = IoMakeAssociatedIrp(
MasterIrp,
(CCHAR)(Vcb->TargetDeviceObject->StackSize + 1) );
if (!Irp) {
Status = STATUS_INSUFFICIENT_RESOURCES;
__leave;
}
Mdl = IoAllocateMdl( (PCHAR)MasterIrp->UserBuffer +
Extent->Offset,
Extent->Length,
FALSE,
FALSE,
Irp );
if (!Mdl) {
Status = STATUS_INSUFFICIENT_RESOURCES;
__leave;
}
IoBuildPartialMdl( MasterIrp->MdlAddress,
Mdl,
(PCHAR)MasterIrp->UserBuffer +Extent->Offset,
Extent->Length );
IoSetNextIrpStackLocation(Irp);
IrpSp = IoGetCurrentIrpStackLocation(Irp);
IrpSp->MajorFunction = IrpContext->MajorFunction;
IrpSp->Parameters.Read.Length = Extent->Length;
IrpSp->Parameters.Read.ByteOffset.QuadPart = Extent->Lba;
IoSetCompletionRoutine(
Irp,
Ext2CanIWait() ?
Ext2ReadWriteBlockSyncCompletionRoutine :
Ext2ReadWriteBlockAsyncCompletionRoutine,
(PVOID) pContext,
TRUE,
TRUE,
TRUE );
IrpSp = IoGetNextIrpStackLocation(Irp);
IrpSp->MajorFunction = IrpContext->MajorFunction;
IrpSp->Parameters.Read.Length =Extent->Length;
IrpSp->Parameters.Read.ByteOffset.QuadPart = Extent->Lba;
/* set write through flag */
if (IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_THROUGH)) {
SetFlag( IrpSp->Flags, SL_WRITE_THROUGH );
}
/* set verify flag */
if (IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_VERIFY_READ)) {
SetFlag(IrpSp->Flags, SL_OVERRIDE_VERIFY_VOLUME);
}
Extent->Irp = Irp;
pContext->Blocks += 1;
}
MasterIrp->AssociatedIrp.IrpCount = pContext->Blocks;
if (Ext2CanIWait()) {
MasterIrp->AssociatedIrp.IrpCount += 1;
}
}
if (!Ext2CanIWait()) {
/* mark MasterIrp pending */
IoMarkIrpPending(pContext->MasterIrp);
}
bBugCheck = TRUE;
for (Extent = Chain; Extent != NULL; Extent = Extent->Next) {
Status = IoCallDriver ( Vcb->TargetDeviceObject,
Extent->Irp);
Extent->Irp = NULL;
}
if (Ext2CanIWait()) {
KeWaitForSingleObject( &(pContext->Event),
Executive, KernelMode, FALSE, NULL );
KeClearEvent( &(pContext->Event) );
} else {
bMasterCompleted = TRUE;
}
} __finally {
for (Extent = Chain; Extent != NULL; Extent = Extent->Next) {
if (Extent->Irp != NULL ) {
if (Extent->Irp->MdlAddress != NULL) {
IoFreeMdl(Extent->Irp->MdlAddress );
}
IoFreeIrp(Extent->Irp);
}
}
if (IrpContext->ExceptionInProgress) {
if (bBugCheck) {
Ext2BugCheck(EXT2_BUGCHK_BLOCK, 0, 0, 0);
}
} else {
if (Ext2CanIWait()) {
if (MasterIrp) {
Status = MasterIrp->IoStatus.Status;
}
if (pContext) {
Ext2FreePool(pContext, EXT2_RWC_MAGIC);
DEC_MEM_COUNT(PS_RW_CONTEXT, pContext, sizeof(EXT2_RW_CONTEXT));
}
} else {
if (bMasterCompleted) {
IrpContext->Irp = NULL;
Status = STATUS_PENDING;
}
}
}
}
return Status;
}
NTSTATUS
Ext2ExpandLast(
IN PEXT2_IRP_CONTEXT IrpContext,
IN PEXT2_VCB Vcb,
IN PEXT2_MCB Mcb,
IN ULONG Base,
IN ULONG Layer,
IN PULONG * Data,
IN PULONG Hint,
IN PULONG Block,
IN OUT PULONG Number
)
{
PULONG pData = NULL;
ULONG i;
NTSTATUS Status = STATUS_SUCCESS;
if (Layer > 0 || IsMcbDirectory(Mcb)) {
/* allocate buffer for new block */
pData = (ULONG *) Ext2AllocatePool(
PagedPool,
BLOCK_SIZE,
EXT2_DATA_MAGIC
);
if (!pData) {
DEBUG(DL_ERR, ( "Ex2ExpandBlock: failed to allocate memory for Data.\n"));
Status = STATUS_INSUFFICIENT_RESOURCES;
goto errorout;
}
RtlZeroMemory(pData, BLOCK_SIZE);
INC_MEM_COUNT(PS_BLOCK_DATA, pData, BLOCK_SIZE);
}
/* allocate block from disk */
Status = Ext2NewBlock(
IrpContext,
Vcb,
(Mcb->Inode.i_ino - 1) / BLOCKS_PER_GROUP,
*Hint,
Block,
Number
);
if (!NT_SUCCESS(Status)) {
goto errorout;
}
/* increase inode i_blocks */
Mcb->Inode.i_blocks += (*Number << (BLOCK_BITS - 9));
if (Layer == 0) {
if (IsMcbDirectory(Mcb)) {
/* for directory we need initialize it's entry structure */
PEXT2_DIR_ENTRY2 pEntry;
pEntry = (PEXT2_DIR_ENTRY2) pData;
pEntry->rec_len = (USHORT)(BLOCK_SIZE);
ASSERT(*Number == 1);
Ext2SaveBlock(IrpContext, Vcb, *Block, (PVOID)pData);
}
/* add new Extent into Mcb */
if (!Ext2AddBlockExtent(Vcb, Mcb, Base, (*Block), *Number)) {
DbgBreak();
ClearFlag(Mcb->Flags, MCB_ZONE_INITED);
Ext2ClearAllExtents(&Mcb->Extents);
}
} else {
/* zero the content of all meta blocks */
for (i = 0; i < *Number; i++) {
Ext2SaveBlock(IrpContext, Vcb, *Block + i, (PVOID)pData);
/* add block to meta extents */
if (!Ext2AddMcbMetaExts(Vcb, Mcb, *Block + i, 1)) {
DbgBreak();
Ext2Sleep(500);
Ext2AddMcbMetaExts(Vcb, Mcb, *Block + i, 1);
}
}
}
errorout:
if (NT_SUCCESS(Status)) {
*Hint = *Block + *Number;
if (Data) {
*Data = pData;
ASSERT(*Number == 1);
} else {
if (pData) {
Ext2FreePool(pData, EXT2_DATA_MAGIC);
DEC_MEM_COUNT(PS_BLOCK_DATA, pData, BLOCK_SIZE);
}
}
} else {
if (pData) {
Ext2FreePool(pData, EXT2_DATA_MAGIC);
DEC_MEM_COUNT(PS_BLOCK_DATA, pData, BLOCK_SIZE);
}
if (*Block) {
Ext2FreeBlock(IrpContext, Vcb, *Block, *Number);
Mcb->Inode.i_blocks -= (*Number << (BLOCK_BITS - 9));
*Block = 0;
}
}
return Status;
}
/*************************************************************************
*
* Function: Ext2QueryDirectory()
*
* Description:
* Query directory request.
*
* Expected Interrupt Level (for execution) :
*
* IRQL_PASSIVE_LEVEL
*
* Return Value: STATUS_SUCCESS/Error
*
*************************************************************************/
NTSTATUS NTAPI Ext2QueryDirectory(
PtrExt2IrpContext PtrIrpContext,
PIRP PtrIrp,
#ifdef _GNU_NTIFS_
PEXTENDED_IO_STACK_LOCATION PtrIoStackLocation,
#else
PIO_STACK_LOCATION PtrIoStackLocation,
#endif
PFILE_OBJECT PtrFileObject,
PtrExt2FCB PtrFCB,
PtrExt2CCB PtrCCB)
{
NTSTATUS RC = STATUS_SUCCESS;
BOOLEAN PostRequest = FALSE;
PtrExt2NTRequiredFCB PtrReqdFCB = NULL;
BOOLEAN CanWait = FALSE;
PtrExt2VCB PtrVCB = NULL;
BOOLEAN AcquiredFCB = FALSE;
unsigned long BufferLength = 0;
unsigned long BufferIndex = 0;
unsigned long FileIndex = 0;
PUNICODE_STRING PtrSearchPattern = NULL;
FILE_INFORMATION_CLASS FileInformationClass;
BOOLEAN RestartScan = FALSE;
BOOLEAN ReturnSingleEntry = FALSE;
BOOLEAN IndexSpecified = FALSE;
unsigned char *Buffer = NULL;
BOOLEAN FirstTimeQuery = FALSE;
unsigned long StartingIndexForSearch = 0;
unsigned long BytesReturned = 0;
BOOLEAN BufferUsedup = FALSE;
BOOLEAN SearchWithWildCards = FALSE;
PFILE_BOTH_DIR_INFORMATION BothDirInformation = NULL;
PFILE_DIRECTORY_INFORMATION DirectoryInformation = NULL;
PEXT2_DIR_ENTRY PtrDirEntry = NULL;
PEXT2_INODE PtrInode = NULL;
unsigned long LogicalBlockSize;
unsigned long ThisBlock;
// The starting Physical Block No...
//LARGE_INTEGER StartPhysicalBlock;
LARGE_INTEGER StartBufferOffset ;
ULONG PinBufferLength;
// Buffer Control Block
PBCB PtrBCB = NULL;
BYTE * PtrPinnedBlockBuffer = NULL;
unsigned int j;
DebugTrace(DEBUG_TRACE_MISC, " === Querying Directory %S", PtrFCB->FCBName->ObjectName.Buffer );
try
{
// Validate the sent-in FCB
if ((PtrFCB->NodeIdentifier.NodeType == EXT2_NODE_TYPE_VCB) || !(PtrFCB->FCBFlags & EXT2_FCB_DIRECTORY))
{
// We will only allow notify requests on directories.
RC = STATUS_INVALID_PARAMETER;
}
PtrReqdFCB = &(PtrFCB->NTRequiredFCB);
CanWait = ((PtrIrpContext->IrpContextFlags & EXT2_IRP_CONTEXT_CAN_BLOCK) ? TRUE : FALSE);
PtrVCB = PtrFCB->PtrVCB;
//
// Asynchronous IO requested
// Posting request...
//
/*
* This is incorrect because posted IRP_MJ_DIRECTORY_CONTROL
* requests aren't handled in the worker thread yet. I tried
* adding handling of them to the worked routine, but there
* were problems with accessing the PtrIoStackLocation->
* Parameters.QueryDirectory.FileName variable.
* -- Filip Navara, 18/08/2004
*/
#if 0
if (!CanWait)
{
PostRequest = TRUE;
try_return(RC = STATUS_PENDING);
}
#endif
// Obtain the callers parameters
BufferLength = PtrIoStackLocation->Parameters.QueryDirectory.Length;
PtrSearchPattern = ( PUNICODE_STRING ) PtrIoStackLocation->Parameters.QueryDirectory.FileName;
FileInformationClass = PtrIoStackLocation->Parameters.QueryDirectory.FileInformationClass;
FileIndex = PtrIoStackLocation->Parameters.QueryDirectory.FileIndex;
// Some additional arguments that affect the FSD behavior
RestartScan = (PtrIoStackLocation->Flags & SL_RESTART_SCAN);
ReturnSingleEntry = (PtrIoStackLocation->Flags & SL_RETURN_SINGLE_ENTRY);
IndexSpecified = (PtrIoStackLocation->Flags & SL_INDEX_SPECIFIED);
//
// Acquiring exclusive access to the FCB.
// This is not mandatory
//
DebugTrace(DEBUG_TRACE_MISC, "*** Going into a block to acquire FCB Exclusively[DirCtrl]", 0);
DebugTraceState( "FCBMain AC:0x%LX SW:0x%LX EX:0x%LX [DirCtrl]", PtrReqdFCB->MainResource.ActiveCount, PtrReqdFCB->MainResource.NumberOfExclusiveWaiters, PtrReqdFCB->MainResource.NumberOfSharedWaiters );
ExAcquireResourceExclusiveLite(&(PtrReqdFCB->MainResource), TRUE);
DebugTrace(DEBUG_TRACE_MISC, "*** FCB acquired [DirCtrl]", 0);
AcquiredFCB = TRUE;
// We must determine the buffer pointer to be used. Since this
// routine could either be invoked directly in the context of the
// calling thread, or in the context of a worker thread, here is
// a general way of determining what we should use.
Buffer = Ext2GetCallersBuffer ( PtrIrp );
// The method of determining where to look from and what to look for is
// unfortunately extremely confusing. However, here is a methodology you
// you can broadly adopt:
// (a) You have to maintain a search buffer per CCB structure.
// (b) This search buffer is initialized the very first time
// a query directory operation is performed using the file object.
// (For the sample FSD, the search buffer is stored in the
// DirectorySearchPattern field)
// However, the caller still has the option of "overriding" this stored
// search pattern by supplying a new one in a query directory operation.
//
if( PtrCCB->DirectorySearchPattern.Length )
{
if( PtrCCB->DirectorySearchPattern.Buffer[PtrCCB->DirectorySearchPattern.Length/2] != 0 )
{
DebugTrace(DEBUG_TRACE_MISC, "&&&&&&&&& PtrCCB->DirectorySearchPattern not NULL terminated!", 0);
}
DebugTrace(DEBUG_TRACE_MISC, " === Old Search pattern %S", PtrCCB->DirectorySearchPattern.Buffer );
}
if (PtrSearchPattern != NULL)
{
// User has supplied a search pattern
// Now validate that the search pattern is legitimate
if ( PtrCCB->DirectorySearchPattern.Length == 0 )
{
// This must be the very first query request.
FirstTimeQuery = TRUE;
}
else
{
// We should ignore the search pattern in the CCB and instead,
// use the user-supplied pattern for this particular query
// directory request.
Ext2DeallocateUnicodeString( &PtrCCB->DirectorySearchPattern );
}
// Now, allocate enough memory to contain the caller
// supplied search pattern and fill in the DirectorySearchPattern
// field in the CCB
Ext2CopyUnicodeString( &PtrCCB->DirectorySearchPattern, PtrSearchPattern );
/*
PtrCCB->DirectorySearchPattern = Ext2AllocatePool(PagedPool, sizeof( PtrSearchPattern ) );
ASSERT(PtrCCB->DirectorySearchPattern);
RtlCopyMemory( PtrCCB->DirectorySearchPattern, PtrSearchPattern, sizeof( PtrSearchPattern ) );
*/
}
else if ( PtrCCB->DirectorySearchPattern.Length == 0 )
{
// This MUST be the first directory query operation (else the
// DirectorySearchPattern field would never be empty. Also, the caller
// has neglected to provide a pattern so we MUST invent one.
// Use "*" (following NT conventions) as your search pattern
// and store it in the PtrCCB->DirectorySearchPattern field.
/*
PtrCCB->DirectorySearchPattern = Ext2AllocatePool(PagedPool, sizeof(L"*") );
ASSERT(PtrCCB->DirectorySearchPattern);
RtlCopyMemory( PtrCCB->DirectorySearchPattern, L"*", 4 );*/
Ext2CopyWideCharToUnicodeString( &PtrCCB->DirectorySearchPattern, L"*" );
FirstTimeQuery = TRUE;
}
else
{
// The caller has not supplied any search pattern...
// Using previously supplied pattern
PtrSearchPattern = &PtrCCB->DirectorySearchPattern;
}
if( PtrCCB->DirectorySearchPattern.Buffer[PtrCCB->DirectorySearchPattern.Length/2] != 0 )
{
DebugTrace(DEBUG_TRACE_MISC, "&&&&&&&&& PtrCCB->DirectorySearchPattern not NULL terminated!", 0 );
}
DebugTrace(DEBUG_TRACE_MISC, " === Search pattern %S", PtrCCB->DirectorySearchPattern.Buffer );
SearchWithWildCards = FsRtlDoesNameContainWildCards( PtrSearchPattern );
// There is one other piece of information that your FSD must store
// in the CCB structure for query directory support. This is the index
// value (i.e. the offset in your on-disk directory structure) from
// which you should start searching.
// However, the flags supplied with the IRP can make us override this
// as well.
if (FileIndex)
{
// Caller has told us wherefrom to begin.
// You may need to round this to an appropriate directory entry
// entry alignment value.
StartingIndexForSearch = FileIndex;
}
else if (RestartScan)
{
StartingIndexForSearch = 0;
}
else
{
// Get the starting offset from the CCB.
StartingIndexForSearch = PtrCCB->CurrentByteOffset.LowPart;
}
// Read in the file inode if it hasn't already been read...
Ext2InitializeFCBInodeInfo( PtrFCB );
if (PtrFileObject->PrivateCacheMap == NULL)
{
CcInitializeCacheMap(PtrFileObject, (PCC_FILE_SIZES)(&(PtrReqdFCB->CommonFCBHeader.AllocationSize)),
TRUE, // We will utilize pin access for directories
&(Ext2GlobalData.CacheMgrCallBacks), // callbacks
PtrCCB); // The context used in callbacks
}
//
// Read in the next Data Block of this directory
//
LogicalBlockSize = EXT2_MIN_BLOCK_SIZE << PtrVCB->LogBlockSize;
StartBufferOffset.QuadPart = ( StartingIndexForSearch / LogicalBlockSize );
StartBufferOffset.QuadPart *= LogicalBlockSize; // This should be the StartBufferOffset alaigned to LBlock boundary...
PinBufferLength = PtrReqdFCB->CommonFCBHeader.FileSize.LowPart - StartBufferOffset.LowPart;
if ( !CcMapData( PtrFileObject,
&StartBufferOffset,
PinBufferLength,
TRUE,
&PtrBCB,
(PVOID*)&PtrPinnedBlockBuffer ) )
{
// Read Failure
DebugTrace(DEBUG_TRACE_MISC, "Cache read failiure while reading in volume meta data", 0);
try_return();
}
else
{
DebugTrace(DEBUG_TRACE_MISC, "Cache hit while reading in volume meta data", 0);
}
PtrInode = Ext2AllocatePool( PagedPool, sizeof( EXT2_INODE ) );
//
// Walking through the directory entries...
for( BufferUsedup = FALSE, BufferIndex = 0; !BufferUsedup && StartingIndexForSearch < ( PtrFCB->NTRequiredFCB.CommonFCBHeader.FileSize.QuadPart - 1) ; )
{
PtrDirEntry = (PEXT2_DIR_ENTRY) &PtrPinnedBlockBuffer[ StartingIndexForSearch - StartBufferOffset.LowPart ];
StartingIndexForSearch += PtrDirEntry->rec_len;
PtrCCB->CurrentByteOffset.LowPart = StartingIndexForSearch;
if( PtrDirEntry->inode == 0 )
{
continue;
}
if( PtrDirEntry->name_len == 0 || PtrDirEntry->rec_len == 0 )
{
//
// This should not happen
// Hqw can this be so!!!
//
Ext2BreakPoint();
if( BothDirInformation )
{
BothDirInformation->NextEntryOffset = 0;
}
if( !BytesReturned )
{
if( FirstTimeQuery )
RC = STATUS_NO_SUCH_FILE;
else
RC = STATUS_NO_MORE_FILES;
}
break;
}
// Does this entry match the search criterian?
// Checking
//
{
UNICODE_STRING FileName;
LONG Matched = 0;
// Constructing a counted Unicode string out of PtrDirEntry
Ext2CopyCharToUnicodeString( &FileName, PtrDirEntry->name, PtrDirEntry->name_len );
if ( SearchWithWildCards )
{
Matched = FsRtlIsNameInExpression ( PtrSearchPattern, &FileName, FALSE, NULL );
}
else
{
Matched = ! RtlCompareUnicodeString( PtrSearchPattern, &FileName, FALSE );
}
Ext2DeallocateUnicodeString( &FileName );
if( !Matched )
{
continue;
}
}
switch( FileInformationClass )
{
case FileBothDirectoryInformation:
DebugTrace(DEBUG_TRACE_DIRINFO, " === FileBothDirectoryInformation", 0 );
ThisBlock = sizeof( FILE_BOTH_DIR_INFORMATION );
ThisBlock += PtrDirEntry->name_len*2;
ThisBlock = Ext2QuadAlign( ThisBlock );
if( ( BufferIndex + ThisBlock ) > BufferLength )
{
//
// Next entry won't fit into the buffer...
// will have to return...
// :(
//
if( BothDirInformation )
BothDirInformation->NextEntryOffset = 0;
if( !BytesReturned )
RC = STATUS_NO_MORE_FILES;
BufferUsedup = TRUE;
break;
}
Ext2ReadInode( PtrVCB, PtrDirEntry->inode, PtrInode );
if( !PtrInode )
{
try_return( RC = STATUS_UNSUCCESSFUL );
}
BothDirInformation = ( PFILE_BOTH_DIR_INFORMATION ) ( Buffer + ( BufferIndex ) );
BothDirInformation->EaSize = 0;
BothDirInformation->AllocationSize.QuadPart = PtrInode->i_blocks * 512;
BothDirInformation->EndOfFile.QuadPart = PtrInode->i_size;
BothDirInformation->ChangeTime.QuadPart = 0;
BothDirInformation->CreationTime.QuadPart = ( __int64 ) PtrInode->i_ctime * 10000000;
BothDirInformation->CreationTime.QuadPart += Ext2GlobalData.TimeDiff.QuadPart;
BothDirInformation->LastAccessTime.QuadPart = Ext2GlobalData.TimeDiff.QuadPart + ( ( __int64 ) PtrInode->i_atime * 10000000 );
BothDirInformation->LastWriteTime.QuadPart = Ext2GlobalData.TimeDiff.QuadPart + ( ( __int64 )PtrInode->i_mtime * 10000000 );
// Getting the file type...
BothDirInformation->FileAttributes = FILE_ATTRIBUTE_NORMAL;
if( ! Ext2IsModeRegularFile( PtrInode->i_mode ) )
{
// Not a reqular file...
if( Ext2IsModeDirectory( PtrInode->i_mode) )
{
// Directory...
BothDirInformation->FileAttributes |= FILE_ATTRIBUTE_DIRECTORY;
}
else
{
// Special File...
// Treated with respect... ;)
//
BothDirInformation->FileAttributes |= ( FILE_ATTRIBUTE_SYSTEM | FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_READONLY);
// FILE_ATTRIBUTE_DEVICE
}
if ( Ext2IsModeHidden( PtrInode->i_mode ) )
{
BothDirInformation->FileAttributes |= FILE_ATTRIBUTE_HIDDEN;
}
if ( Ext2IsModeReadOnly( PtrInode->i_mode ) )
{
BothDirInformation->FileAttributes |= FILE_ATTRIBUTE_READONLY;
}
}
BothDirInformation->FileIndex = StartingIndexForSearch;
BothDirInformation->FileNameLength = PtrDirEntry->name_len*2 + 2;
BothDirInformation->ShortNameLength = 0;
BothDirInformation->ShortName[0] = 0;
// Copying out the name as WCHAR null terminated strings
for( j = 0; j< PtrDirEntry->name_len ; j ++ )
{
// BothDirInformation->ShortName[ j ] = PtrDirEntry->name[j];
BothDirInformation->FileName[ j ] = PtrDirEntry->name[j];
// if( j < 11 )
// BothDirInformation->ShortName[j] = PtrDirEntry->name[j];
}
/*
if( j < 11 )
{
BothDirInformation->ShortNameLength = j * 2 + 2;
BothDirInformation->ShortName[ j ] = 0;
}
else
{
BothDirInformation->ShortNameLength = 24;
BothDirInformation->ShortName[ 11 ] = 0;
}*/
BothDirInformation->FileName[ j ] = 0;
BytesReturned += ThisBlock;
BufferIndex += ThisBlock;
if( !ReturnSingleEntry && ( StartingIndexForSearch < ( PtrFCB->NTRequiredFCB.CommonFCBHeader.FileSize.QuadPart - 1) ))
BothDirInformation->NextEntryOffset = ThisBlock;
else
BothDirInformation->NextEntryOffset = 0;
break;
case FileDirectoryInformation:
// DirectoryInformation
DebugTrace(DEBUG_TRACE_DIRINFO, " === FileDirectoryInformation", 0 );
ThisBlock = sizeof( FILE_DIRECTORY_INFORMATION );
ThisBlock += PtrDirEntry->name_len*2;
ThisBlock = Ext2QuadAlign( ThisBlock );
if( ( BufferIndex + ThisBlock ) > BufferLength )
{
//
// Next entry won't fit into the buffer...
// will have to return...
// :(
//
if( DirectoryInformation )
DirectoryInformation->NextEntryOffset = 0;
if( !BytesReturned )
RC = STATUS_NO_MORE_FILES;
BufferUsedup = TRUE;
break;
}
Ext2ReadInode( PtrVCB, PtrDirEntry->inode, PtrInode );
if( !PtrInode )
{
try_return( RC = STATUS_UNSUCCESSFUL );
}
DirectoryInformation = ( PFILE_DIRECTORY_INFORMATION ) ( Buffer + ( BufferIndex ) );
DirectoryInformation->AllocationSize.QuadPart = PtrInode->i_blocks * 512;
DirectoryInformation->EndOfFile.QuadPart = PtrInode->i_size;
DirectoryInformation->ChangeTime.QuadPart = 0;
DirectoryInformation->CreationTime.QuadPart = ( __int64 ) PtrInode->i_ctime * 10000000;
DirectoryInformation->CreationTime.QuadPart += Ext2GlobalData.TimeDiff.QuadPart;
DirectoryInformation->LastAccessTime.QuadPart = Ext2GlobalData.TimeDiff.QuadPart + ( ( __int64 ) PtrInode->i_atime * 10000000 );
DirectoryInformation->LastWriteTime.QuadPart = Ext2GlobalData.TimeDiff.QuadPart + ( ( __int64 )PtrInode->i_mtime * 10000000 );
// Getting the file type...
DirectoryInformation->FileAttributes = FILE_ATTRIBUTE_NORMAL;
if( ! Ext2IsModeRegularFile( PtrInode->i_mode ) )
{
// Not a reqular file...
if( Ext2IsModeDirectory( PtrInode->i_mode) )
{
// Directory...
DirectoryInformation->FileAttributes |= FILE_ATTRIBUTE_DIRECTORY;
}
else
{
// Special File...
// Treated with respect... ;)
//
DirectoryInformation->FileAttributes |= ( FILE_ATTRIBUTE_SYSTEM | FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_READONLY);
// FILE_ATTRIBUTE_DEVICE
}
if ( Ext2IsModeHidden( PtrInode->i_mode ) )
{
DirectoryInformation->FileAttributes |= FILE_ATTRIBUTE_HIDDEN;
}
if ( Ext2IsModeReadOnly( PtrInode->i_mode ) )
{
DirectoryInformation->FileAttributes |= FILE_ATTRIBUTE_READONLY;
}
}
DirectoryInformation->FileIndex = StartingIndexForSearch;
DirectoryInformation->FileNameLength = PtrDirEntry->name_len*2 + 2;
// Copying out the name as WCHAR null terminated strings
for( j = 0; j< PtrDirEntry->name_len ; j ++ )
{
DirectoryInformation->FileName[ j ] = PtrDirEntry->name[j];
}
DirectoryInformation->FileName[ j ] = 0;
BytesReturned += ThisBlock;
BufferIndex += ThisBlock;
if( !ReturnSingleEntry && ( StartingIndexForSearch < ( PtrFCB->NTRequiredFCB.CommonFCBHeader.FileSize.QuadPart - 1) ))
DirectoryInformation->NextEntryOffset = ThisBlock;
else
DirectoryInformation->NextEntryOffset = 0;
break;
case FileFullDirectoryInformation:
// FullDirInformation->
DebugTrace(DEBUG_TRACE_DIRINFO, " === FileFullDirectoryInformation - Not handled", 0 );
try_return();
case FileNamesInformation:
// NamesInformation->
DebugTrace(DEBUG_TRACE_DIRINFO, " === FileNamesInformation - Not handled", 0 );
try_return();
default:
DebugTrace(DEBUG_TRACE_DIRINFO, " === Invalid Dir Info class - Not handled", 0 );
try_return( RC = STATUS_INVALID_INFO_CLASS );
}
if( ReturnSingleEntry )
{
break;
}
}// end of for...
if( !BytesReturned && StartingIndexForSearch >= ( PtrFCB->NTRequiredFCB.CommonFCBHeader.FileSize.QuadPart) )
{
Ext2DeallocateUnicodeString( &PtrCCB->DirectorySearchPattern );
PtrCCB->CurrentByteOffset.QuadPart = 0;
if( FirstTimeQuery )
RC = STATUS_NO_SUCH_FILE;
else
RC = STATUS_NO_MORE_FILES;
try_return();
}
else if( BytesReturned )
{
BothDirInformation->NextEntryOffset = 0;
}
try_exit: NOTHING;
}
finally
{
if( PtrInode )
{
DebugTrace( DEBUG_TRACE_FREE, "Freeing = %lX [DirCtrl]", PtrInode );
ExFreePool( PtrInode );
}
if( PtrBCB )
{
CcUnpinData( PtrBCB );
PtrBCB = NULL;
}
if (PostRequest)
{
if (AcquiredFCB)
{
Ext2ReleaseResource(&(PtrReqdFCB->MainResource));
DebugTrace(DEBUG_TRACE_MISC, "*** FCB Released in [DirCtrl]", 0);
DebugTraceState( "FCBMain AC:0x%LX SW:0x%LX EX:0x%LX [DirCtrl]",
PtrReqdFCB->MainResource.ActiveCount,
PtrReqdFCB->MainResource.NumberOfExclusiveWaiters,
PtrReqdFCB->MainResource.NumberOfSharedWaiters );
}
// Map the users buffer and then post the request.
RC = Ext2LockCallersBuffer(PtrIrp, TRUE, BufferLength);
ASSERT(NT_SUCCESS(RC));
RC = Ext2PostRequest(PtrIrpContext, PtrIrp);
}
else if (!(PtrIrpContext->IrpContextFlags &
EXT2_IRP_CONTEXT_EXCEPTION))
{
if (AcquiredFCB)
{
Ext2ReleaseResource(&(PtrReqdFCB->MainResource));
DebugTrace(DEBUG_TRACE_MISC, "*** FCB Released [DirCtrl]", 0);
DebugTraceState( "FCBMain AC:0x%LX SW:0x%LX EX:0x%LX [DirCtrl]",
PtrReqdFCB->MainResource.ActiveCount,
PtrReqdFCB->MainResource.NumberOfExclusiveWaiters,
PtrReqdFCB->MainResource.NumberOfSharedWaiters );
}
// Complete the request.
PtrIrp->IoStatus.Status = RC;
PtrIrp->IoStatus.Information = BytesReturned;
// Free up the Irp Context
Ext2ReleaseIrpContext(PtrIrpContext);
// complete the IRP
IoCompleteRequest(PtrIrp, IO_DISK_INCREMENT);
}
// Flush the saved BCBs...
// Ext2FlushSavedBCBs ( PtrIrpContext );
}
return(RC);
}