verfysup.c File Reference

#include "fatprocs.h"

Include dependency graph for verfysup.c:

Go to the source code of this file.

Macros
#define	BugCheckFileId   (FAT_BUG_CHECK_VERFYSUP)
#define	Dbg   (DEBUG_TRACE_VERFYSUP)

Functions
VOID	FatResetFcb (IN PIRP_CONTEXT IrpContext, IN PFCB Fcb)
BOOLEAN	FatMatchFileSize (__in PIRP_CONTEXT IrpContext, __in PDIRENT Dirent, __in PFCB Fcb)
	_Requires_lock_held_ (_Global_critical_region_)
BOOLEAN	FatMarkDevForVerifyIfVcbMounted (IN PVCB Vcb)
VOID	FatVerifyVcb (IN PIRP_CONTEXT IrpContext, IN PVCB Vcb)
VOID NTAPI	FatDeferredCleanVolume (_In_ PVOID Parameter)
VOID NTAPI	FatCleanVolumeDpc (_In_ PKDPC Dpc, _In_opt_ PVOID DeferredContext, _In_opt_ PVOID SystemArgument1, _In_opt_ PVOID SystemArgument2)
VOID NTAPI	FatFspMarkVolumeDirtyWithRecover (PVOID Parameter)
VOID	FatCheckDirtyBit (IN PIRP_CONTEXT IrpContext, IN PVCB Vcb)
VOID	FatVerifyOperationIsLegal (IN PIRP_CONTEXT IrpContext)
VOID	FatQuickVerifyVcb (IN PIRP_CONTEXT IrpContext, IN PVCB Vcb)
NTSTATUS NTAPI	FatMarkVolumeCompletionRoutine (_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp, _In_reads_opt_(_Inexpressible_("varies")) PVOID Contxt)

Macro Definition Documentation

BugCheckFileId

#define BugCheckFileId   (FAT_BUG_CHECK_VERFYSUP)

Definition at line 23 of file verfysup.c.

Dbg

#define Dbg   (DEBUG_TRACE_VERFYSUP)

Definition at line 29 of file verfysup.c.

Function Documentation

_Requires_lock_held_()

_Requires_lock_held_

(

_Global_critical_region_

)

Definition at line 48 of file verfysup.c.

{
    PAGED_CODE();
 
    DebugTrace(+1, Dbg, "FatMarkFcbCondition, Fcb = %p\n", Fcb );
 
    //
    //  If we are marking this Fcb something other than Good, we will need
    //  to have the Vcb exclusive.
    //
 
    NT_ASSERT( FcbCondition != FcbNeedsToBeVerified ? TRUE :
            FatVcbAcquiredExclusive(IrpContext, Fcb->Vcb) );
 
    //
    //  If this is a PagingFile it has to be good unless media underneath is
    //  removable. The "removable" check was added specifically for ReadyBoost,
    //  which opens its cache file on a removable device as a paging file and
    //  relies on the file system to validate its mapping information after a
    //  power transition.
    //
 
    if (!FlagOn(Fcb->Vcb->VcbState, VCB_STATE_FLAG_REMOVABLE_MEDIA) &&
        FlagOn(Fcb->FcbState, FCB_STATE_PAGING_FILE)) {
 
        Fcb->FcbCondition = FcbGood;
        return;
    }
 
    //
    //  Update the condition of the Fcb.
    //
 
    Fcb->FcbCondition = FcbCondition;
 
    DebugTrace(0, Dbg, "MarkFcb: %wZ\n", &Fcb->FullFileName);
 
    //
    //  This FastIo flag is based on FcbCondition, so update it now.  This only
    //  applies to regular FCBs, of course.
    //
 
    if (Fcb->Header.NodeTypeCode == FAT_NTC_FCB) {
 
        Fcb->Header.IsFastIoPossible = FatIsFastIoPossible( Fcb );
    }
 
    if (FcbCondition == FcbNeedsToBeVerified) {
        FatResetFcb( IrpContext, Fcb );
    }
 
    //
    //  Now if we marked NeedsVerify or Bad a directory then we also need to
    //  go and mark all of our children with the same condition.
    //
 
    if ( ((FcbCondition == FcbNeedsToBeVerified) ||
          (FcbCondition == FcbBad)) &&
         Recursive &&
         ((Fcb->Header.NodeTypeCode == FAT_NTC_DCB) ||
          (Fcb->Header.NodeTypeCode == FAT_NTC_ROOT_DCB)) ) {
 
        PFCB OriginalFcb = Fcb;
 
        while ( (Fcb = FatGetNextFcbTopDown(IrpContext, Fcb, OriginalFcb)) != NULL ) {
 
            DebugTrace(0, Dbg, "MarkFcb: %wZ\n", &Fcb->FullFileName);
 
            Fcb->FcbCondition = FcbCondition;
 
            //
            //  We already know that FastIo is not possible since we are propagating
            //  a parent's bad/verify flag down the tree - IO to the children must
            //  take the long route for now.
            //
 
            Fcb->Header.IsFastIoPossible = FastIoIsNotPossible;
 
            //
            //  Leave all the Fcbs in a condition to be verified.
            //
 
            if (FcbCondition == FcbNeedsToBeVerified) {
                FatResetFcb( IrpContext, Fcb );
            }
 
        }
    }
 
    DebugTrace(-1, Dbg, "FatMarkFcbCondition -> VOID\n", 0);
 
    return;
}

FatCheckDirtyBit()

VOID FatCheckDirtyBit	(	IN PIRP_CONTEXT	IrpContext,
		IN PVCB	Vcb
	)

Definition at line 1185 of file verfysup.c.

{
    BOOLEAN Dirty;
 
    PPACKED_BOOT_SECTOR BootSector;
    PBCB BootSectorBcb;
 
    UNICODE_STRING VolumeLabel;
 
    PAGED_CODE();
 
    //
    //  Look in the boot sector
    //
 
    FatReadVolumeFile( IrpContext,
                       Vcb,
                       0,
                       sizeof(PACKED_BOOT_SECTOR),
                       &BootSectorBcb,
                       (PVOID *)&BootSector );
 
    _SEH2_TRY {
 
        //
        //  Check if the magic bit is set
        //
 
        if (IsBpbFat32(&BootSector->PackedBpb)) {
            Dirty = BooleanFlagOn( ((PPACKED_BOOT_SECTOR_EX)BootSector)->CurrentHead,
                                   FAT_BOOT_SECTOR_DIRTY );
        } else {
            Dirty = BooleanFlagOn( BootSector->CurrentHead, FAT_BOOT_SECTOR_DIRTY );
        }
 
        //
        //  Setup the VolumeLabel string
        //
 
        VolumeLabel.Length = Vcb->Vpb->VolumeLabelLength;
        VolumeLabel.MaximumLength = MAXIMUM_VOLUME_LABEL_LENGTH;
        VolumeLabel.Buffer = &Vcb->Vpb->VolumeLabel[0];
 
        if ( Dirty ) {
 
            //
            //  Do not trigger the mounted dirty bit if this is a verify
            //  and the volume is a boot or paging device.  We know that
            //  a boot or paging device cannot leave the system, and thus
            //  that on its mount we will have figured this out correctly.
            //
            //  This logic is a reasonable change.  Why?
            //  'cause setup cracked a non-exclusive DASD handle near the
            //  end of setup, wrote some data, closed the handle and we
            //  set the verify bit ... came back around and saw that other
            //  arbitrary activity had left the volume in a temporarily dirty
            //  state.
            //
            //  Of course, the real problem is that we don't have a journal.
            //
 
            if (!(IrpContext->MajorFunction == IRP_MJ_FILE_SYSTEM_CONTROL &&
                  IrpContext->MinorFunction == IRP_MN_VERIFY_VOLUME &&
                  FlagOn( Vcb->VcbState, VCB_STATE_FLAG_BOOT_OR_PAGING_FILE))) {
 
                KdPrintEx((DPFLTR_FASTFAT_ID,
                           DPFLTR_INFO_LEVEL,
                           "FASTFAT: WARNING! Mounting Dirty Volume %Z\n",
                           &VolumeLabel));
 
                SetFlag( Vcb->VcbState, VCB_STATE_FLAG_MOUNTED_DIRTY );
            }
 
        } else {
 
            if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_MOUNTED_DIRTY)) {
 
                KdPrintEx((DPFLTR_FASTFAT_ID,
                           DPFLTR_INFO_LEVEL,
                           "FASTFAT: Volume %Z has been cleaned.\n",
                           &VolumeLabel));
 
                ClearFlag( Vcb->VcbState, VCB_STATE_FLAG_MOUNTED_DIRTY );
 
            } else {
 
                (VOID)FsRtlBalanceReads( Vcb->TargetDeviceObject );
            }
        }
 
    } _SEH2_FINALLY {
 
        FatUnpinBcb( IrpContext, BootSectorBcb );
    } _SEH2_END;
}

FatCleanVolumeDpc()

VOID NTAPI FatCleanVolumeDpc	(	_In_ PKDPC	Dpc,
		_In_opt_ PVOID	DeferredContext,
		_In_opt_ PVOID	SystemArgument1,
		_In_opt_ PVOID	SystemArgument2
	)

Definition at line 654 of file verfysup.c.

{
    PVCB Vcb;
    PCLEAN_AND_DIRTY_VOLUME_PACKET Packet;
 
    UNREFERENCED_PARAMETER( SystemArgument1 );
    UNREFERENCED_PARAMETER( SystemArgument2 );
    UNREFERENCED_PARAMETER( Dpc );
 
    Vcb = (PVCB)DeferredContext;
 
 
    //
    //  If there is still dirty data (highly unlikely), set the timer for a
    //  second in the future.
    //
 
    if (CcIsThereDirtyData(Vcb->Vpb)) {
 
        LARGE_INTEGER TwoSecondsFromNow;
 
        TwoSecondsFromNow.QuadPart = (LONG)-2*1000*1000*10;
 
        KeSetTimer( &Vcb->CleanVolumeTimer,
                    TwoSecondsFromNow,
                    &Vcb->CleanVolumeDpc );
 
        return;
    }
 
    //
    //  If we couldn't get pool, oh well....
    //
 
    Packet = ExAllocatePoolWithTag(NonPagedPoolNx, sizeof(CLEAN_AND_DIRTY_VOLUME_PACKET), ' taF');
 
    if ( Packet ) {
 
        Packet->Vcb = Vcb;
        Packet->Irp = NULL;
 
        //
        //  Clear the dirty flag now since we cannot synchronize after this point.
        //
 
        ClearFlag( Packet->Vcb->VcbState, VCB_STATE_FLAG_VOLUME_DIRTY );
 
        ExInitializeWorkItem( &Packet->Item, &FatDeferredCleanVolume, Packet );
 
#ifdef _MSC_VER
#pragma prefast( suppress:28159, "prefast indicates this is an obsolete API, but it is ok for fastfat to keep using it" )
#endif
        ExQueueWorkItem( &Packet->Item, CriticalWorkQueue );
    }
 
    return;
}

FatDeferredCleanVolume()

VOID NTAPI FatDeferredCleanVolume

(

_In_ PVOID

Parameter

)

Definition at line 499 of file verfysup.c.

{
    PCLEAN_AND_DIRTY_VOLUME_PACKET Packet;
    PLIST_ENTRY Links;
    PVCB Vcb;
    IRP_CONTEXT IrpContext;
    BOOLEAN VcbExists = FALSE;
 
    PAGED_CODE();
 
    DebugTrace(+1, Dbg, "FatDeferredCleanVolume\n", 0);
 
    Packet = (PCLEAN_AND_DIRTY_VOLUME_PACKET)Parameter;
 
    Vcb = Packet->Vcb;
 
    //
    //  Make us appear as a top level FSP request so that we will
    //  receive any errors from the operation.
    //
 
    IoSetTopLevelIrp( (PIRP)FSRTL_FSP_TOP_LEVEL_IRP );
 
    //
    //  Dummy up and Irp Context so we can call our worker routines
    //
 
    RtlZeroMemory( &IrpContext, sizeof(IRP_CONTEXT));
 
    SetFlag(IrpContext.Flags, IRP_CONTEXT_FLAG_WAIT);
 
    //
    //  Acquire shared access to the global lock and make sure this volume
    //  still exists.
    //
 
#ifdef _MSC_VER
#pragma prefast( push )
#pragma prefast( disable: 28193, "this will always wait" )
#endif
    FatAcquireSharedGlobal( &IrpContext );
#ifdef _MSC_VER
#pragma prefast( pop )
#endif
 
    for (Links = FatData.VcbQueue.Flink;
         Links != &FatData.VcbQueue;
         Links = Links->Flink) {
 
        PVCB ExistingVcb;
 
        ExistingVcb = CONTAINING_RECORD(Links, VCB, VcbLinks);
 
        if ( Vcb == ExistingVcb ) {
 
            VcbExists = TRUE;
            break;
        }
    }
 
    //
    //  If the vcb is good then mark it clean.  Ignore any problems.
    //
 
    if ( VcbExists &&
         (Vcb->VcbCondition == VcbGood) &&
         !FlagOn(Vcb->VcbState, VCB_STATE_FLAG_SHUTDOWN) ) {
 
        _SEH2_TRY {
 
            if (!FlagOn(Vcb->VcbState, VCB_STATE_FLAG_MOUNTED_DIRTY)) {
 
                FatMarkVolume( &IrpContext, Vcb, VolumeClean );
            }
 
            //
            //  Check for a pathological race condition, and fix it.
            //
 
            if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_VOLUME_DIRTY)) {
 
                FatMarkVolume( &IrpContext, Vcb, VolumeDirty );
 
            } else {
 
                //
                //  Unlock the volume if it is removable.
                //
 
                if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_REMOVABLE_MEDIA) &&
                    !FlagOn(Vcb->VcbState, VCB_STATE_FLAG_BOOT_OR_PAGING_FILE)) {
 
                    FatToggleMediaEjectDisable( &IrpContext, Vcb, FALSE );
                }
            }
 
        } _SEH2_EXCEPT( FsRtlIsNtstatusExpected(_SEH2_GetExceptionCode()) ?
                  EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH ) {
 
              NOTHING;
        } _SEH2_END;
    }
 
    //
    //  Release the global resource, unpin and repinned Bcbs and return.
    //
 
    FatReleaseGlobal( &IrpContext );
 
    _SEH2_TRY {
 
        FatUnpinRepinnedBcbs( &IrpContext );
 
    } _SEH2_EXCEPT( FsRtlIsNtstatusExpected(_SEH2_GetExceptionCode()) ?
              EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH ) {
 
          NOTHING;
    } _SEH2_END;
 
    IoSetTopLevelIrp( NULL );
 
    //
    //  and finally free the packet.
    //
 
    ExFreePool( Packet );
 
    return;
}

Referenced by FatCleanVolumeDpc().

FatFspMarkVolumeDirtyWithRecover()

VOID NTAPI FatFspMarkVolumeDirtyWithRecover

(

PVOID

Parameter

)

Definition at line 1098 of file verfysup.c.

{
    PCLEAN_AND_DIRTY_VOLUME_PACKET Packet;
    PVCB Vcb;
    IRP_CONTEXT IrpContext;
    PIRP Irp;
 
    DebugTrace(+1, Dbg, "FatFspMarkVolumeDirtyWithRecover\n", 0);
 
    Packet = (PCLEAN_AND_DIRTY_VOLUME_PACKET)Parameter;
 
    Vcb = Packet->Vcb;
    Irp = Packet->Irp;
 
    //
    //  Dummy up the IrpContext so we can call our worker routines
    //
 
    RtlZeroMemory( &IrpContext, sizeof(IRP_CONTEXT));
 
    SetFlag(IrpContext.Flags, IRP_CONTEXT_FLAG_WAIT);
    IrpContext.OriginatingIrp = Irp;
 
    //
    //  Make us appear as a top level FSP request so that we will
    //  receive any errors from the operation.
    //
 
    IoSetTopLevelIrp( (PIRP)FSRTL_FSP_TOP_LEVEL_IRP );
 
    //
    //  Try to write out the dirty bit.  If something goes wrong, we
    //  tried.
    //
 
    _SEH2_TRY {
 
        SetFlag( Vcb->VcbState, VCB_STATE_FLAG_MOUNTED_DIRTY );
 
        FatMarkVolume( &IrpContext, Vcb, VolumeDirtyWithSurfaceTest );
 
    } _SEH2_EXCEPT(FatExceptionFilter( &IrpContext, _SEH2_GetExceptionInformation() )) {
 
        NOTHING;
    } _SEH2_END;
 
    IoSetTopLevelIrp( NULL );
 
    //
    //  Now complete the originating Irp or set the synchronous event.
    //
 
    if (Packet->Event) {
        KeSetEvent( Packet->Event, 0, FALSE );
    } else {
        IoCompleteRequest( Irp, IO_DISK_INCREMENT );
    }
 
    DebugTrace(-1, Dbg, "FatFspMarkVolumeDirtyWithRecover -> VOID\n", 0);
}

FatMarkDevForVerifyIfVcbMounted()

BOOLEAN FatMarkDevForVerifyIfVcbMounted

(

IN PVCB

Vcb

)

Definition at line 213 of file verfysup.c.

{
    BOOLEAN Marked = FALSE;
    KIRQL SavedIrql;
 
    IoAcquireVpbSpinLock( &SavedIrql );
 
#ifdef _MSC_VER
#pragma prefast( push )
#pragma prefast( disable: 28175, "touching Vpb is ok for a filesystem" )
#endif
 
    if (Vcb->Vpb->RealDevice->Vpb == Vcb->Vpb)  {
 
        SetFlag( Vcb->Vpb->RealDevice->Flags, DO_VERIFY_VOLUME);
        Marked = TRUE;
    }
    else {
 
        //
        //  Flag this to avoid the VPB spinlock in future passes.
        //
 
        SetFlag( Vcb->VcbState, VCB_STATE_VPB_NOT_ON_DEVICE);
    }
 
#ifdef _MSC_VER
#pragma prefast( pop )
#endif
 
    IoReleaseVpbSpinLock( SavedIrql );
 
    return Marked;
}

Referenced by FatQuickVerifyVcb().

FatMarkVolumeCompletionRoutine()

NTSTATUS NTAPI FatMarkVolumeCompletionRoutine	(	_In_ PDEVICE_OBJECT	DeviceObject,
		_In_ PIRP	Irp,
		_In_reads_opt_(_Inexpressible_("varies")) PVOID	Contxt
	)

Definition at line 2013 of file verfysup.c.

{
    //
    //  Set the event so that our call will wake up.
    //
 
    KeSetEvent( (PKEVENT)Contxt, 0, FALSE );
 
    UNREFERENCED_PARAMETER( DeviceObject );
    UNREFERENCED_PARAMETER( Irp );
 
    return STATUS_MORE_PROCESSING_REQUIRED;
}

FatMatchFileSize()

BOOLEAN FatMatchFileSize	(	__in PIRP_CONTEXT	IrpContext,
		__in PDIRENT	Dirent,
		__in PFCB	Fcb
	)

Definition at line 1495 of file verfysup.c.

{
 
    UNREFERENCED_PARAMETER(IrpContext);
 
    if (NodeType(Fcb) != FAT_NTC_FCB) {
        return TRUE;
    }
 
 
        if (Fcb->Header.FileSize.LowPart != Dirent->FileSize) {
            return FALSE;
        }
 
 
    return TRUE;
}

FatQuickVerifyVcb()

VOID FatQuickVerifyVcb	(	IN PIRP_CONTEXT	IrpContext,
		IN PVCB	Vcb
	)

Definition at line 1662 of file verfysup.c.

{
    PAGED_CODE();
 
    //
    //  If the real device needs to be verified we'll set the
    //  DeviceToVerify to be our real device and raise VerifyRequired.
    //
 
    if (FlagOn(Vcb->Vpb->RealDevice->Flags, DO_VERIFY_VOLUME)) {
 
        DebugTrace(0, Dbg, "The Vcb needs to be verified\n", 0);
 
        IoSetHardErrorOrVerifyDevice( IrpContext->OriginatingIrp,
                                      Vcb->Vpb->RealDevice );
 
        FatRaiseStatus( IrpContext, STATUS_VERIFY_REQUIRED );
    }
 
    //
    //  Based on the condition of the Vcb we'll either return to our
    //  caller or raise an error condition
    //
 
    switch (Vcb->VcbCondition) {
 
    case VcbGood:
 
        DebugTrace(0, Dbg, "The Vcb is good\n", 0);
 
        //
        //  Do a check here of an operation that would try to modify a
        //  write protected media.
        //
 
        if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_WRITE_PROTECTED) &&
            ((IrpContext->MajorFunction == IRP_MJ_WRITE) ||
             (IrpContext->MajorFunction == IRP_MJ_SET_INFORMATION) ||
             (IrpContext->MajorFunction == IRP_MJ_SET_EA) ||
             (IrpContext->MajorFunction == IRP_MJ_FLUSH_BUFFERS) ||
             (IrpContext->MajorFunction == IRP_MJ_SET_VOLUME_INFORMATION) ||
             (IrpContext->MajorFunction == IRP_MJ_FILE_SYSTEM_CONTROL &&
              IrpContext->MinorFunction == IRP_MN_USER_FS_REQUEST &&
              IoGetCurrentIrpStackLocation(IrpContext->OriginatingIrp)->Parameters.FileSystemControl.FsControlCode ==
                FSCTL_MARK_VOLUME_DIRTY))) {
 
            //
            //  Set the real device for the pop-up info, and set the verify
            //  bit in the device object, so that we will force a verify
            //  in case the user put the correct media back in.
            //
 
 
            IoSetHardErrorOrVerifyDevice( IrpContext->OriginatingIrp,
                                          Vcb->Vpb->RealDevice );
 
            FatMarkDevForVerifyIfVcbMounted(Vcb);
 
            FatRaiseStatus( IrpContext, STATUS_MEDIA_WRITE_PROTECTED );
        }
 
        break;
 
    case VcbNotMounted:
 
        DebugTrace(0, Dbg, "The Vcb is not mounted\n", 0);
 
        //
        //  Set the real device for the pop-up info, and set the verify
        //  bit in the device object, so that we will force a verify
        //  in case the user put the correct media back in.
        //
 
        IoSetHardErrorOrVerifyDevice( IrpContext->OriginatingIrp,
                                      Vcb->Vpb->RealDevice );
 
        FatRaiseStatus( IrpContext, STATUS_WRONG_VOLUME );
 
        break;
 
    case VcbBad:
 
        DebugTrace(0, Dbg, "The Vcb is bad\n", 0);
 
        if (FlagOn( Vcb->VcbState, VCB_STATE_FLAG_VOLUME_DISMOUNTED )) {
 
            FatRaiseStatus( IrpContext, STATUS_VOLUME_DISMOUNTED );
 
        } else {
 
            FatRaiseStatus( IrpContext, STATUS_FILE_INVALID );
        }
        break;
 
    default:
 
        DebugDump("Invalid VcbCondition\n", 0, Vcb);
#ifdef _MSC_VER
#pragma prefast( suppress:28159, "things are seriously wrong if we get here" )
#endif
        FatBugCheck( Vcb->VcbCondition, 0, 0 );
    }
}

Referenced by _Requires_lock_held_(), and FatVerifyVcb().

FatResetFcb()

VOID FatResetFcb	(	IN PIRP_CONTEXT	IrpContext,
		IN PFCB	Fcb
	)

Definition at line 1396 of file verfysup.c.

{
    LOGICAL IsRealPagingFile;
 
    PAGED_CODE();
    UNREFERENCED_PARAMETER( IrpContext );
 
    //
    //  Don't do the two following operations for the Root Dcb
    //  of a non FAT32 volume or paging files.  Paging files!?
    //  Yes, if someone diddles a volume we try to reverify all
    //  of the Fcbs just in case; however, there is no safe way
    //  to chuck and retrieve the mapping pair information for
    //  a real paging file. Lose it and die.
    //
    //  An exception is made for ReadyBoost cache files, which
    //  are created as paging files on removable devices and
    //  require validation after a power transition.
    //
 
    if (!FlagOn(Fcb->Vcb->VcbState, VCB_STATE_FLAG_REMOVABLE_MEDIA) &&
        FlagOn(Fcb->FcbState, FCB_STATE_PAGING_FILE)) {
 
        IsRealPagingFile = TRUE;
 
    } else {
 
        IsRealPagingFile = FALSE;
    }
 
    if ( (NodeType(Fcb) != FAT_NTC_ROOT_DCB ||
          FatIsFat32( Fcb->Vcb ))  &&
         !IsRealPagingFile ) {
 
        //
        //  Reset the mcb mapping.
        //
 
        FsRtlRemoveLargeMcbEntry( &Fcb->Mcb, 0, 0xFFFFFFFF );
 
        //
        //  Reset the allocation size to 0 or unknown
        //
 
        if ( Fcb->FirstClusterOfFile == 0 ) {
 
            Fcb->Header.AllocationSize.QuadPart = 0;
 
        } else {
 
            Fcb->Header.AllocationSize.QuadPart = FCB_LOOKUP_ALLOCATIONSIZE_HINT;
        }
    }
 
    //
    //  If this is a directory, reset the hints.
    //
 
    if ( (NodeType(Fcb) == FAT_NTC_DCB) ||
         (NodeType(Fcb) == FAT_NTC_ROOT_DCB) ) {
 
        //
        //  Force a rescan of the directory
        //
 
        Fcb->Specific.Dcb.UnusedDirentVbo = 0xffffffff;
        Fcb->Specific.Dcb.DeletedDirentHint = 0xffffffff;
    }
}

FatVerifyOperationIsLegal()

VOID FatVerifyOperationIsLegal

(

IN PIRP_CONTEXT

IrpContext

)

Definition at line 1304 of file verfysup.c.

{
    PIRP Irp;
    PFILE_OBJECT FileObject;
 
    PAGED_CODE();
 
    Irp = IrpContext->OriginatingIrp;
 
    //
    //  If the Irp is not present, then we got here via close.
    //
    //
 
    if ( Irp == NULL ) {
 
        return;
    }
 
    FileObject = IoGetCurrentIrpStackLocation(Irp)->FileObject;
 
    //
    //  If there is not a file object, we cannot continue.
    //
 
    if ( FileObject == NULL ) {
 
        return;
    }
 
    //
    //  If the file object has already been cleaned up, and
    //
    //  A) This request is a paging io read or write, or
    //  B) This request is a close operation, or
    //  C) This request is a set or query info call (for Lou)
    //  D) This is an MDL complete
    //
    //  let it pass, otherwise return STATUS_FILE_CLOSED.
    //
 
    if ( FlagOn(FileObject->Flags, FO_CLEANUP_COMPLETE) ) {
 
        PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation( Irp );
 
        if ( (FlagOn(Irp->Flags, IRP_PAGING_IO)) ||
             (IrpSp->MajorFunction == IRP_MJ_CLOSE ) ||
             (IrpSp->MajorFunction == IRP_MJ_SET_INFORMATION) ||
             (IrpSp->MajorFunction == IRP_MJ_QUERY_INFORMATION) ||
             ( ( (IrpSp->MajorFunction == IRP_MJ_READ) ||
                 (IrpSp->MajorFunction == IRP_MJ_WRITE) ) &&
               FlagOn(IrpSp->MinorFunction, IRP_MN_COMPLETE) ) ) {
 
            NOTHING;
 
        } else {
 
            FatRaiseStatus( IrpContext, STATUS_FILE_CLOSED );
        }
    }
 
    return;
}

Referenced by _Requires_lock_held_().

FatVerifyVcb()

VOID FatVerifyVcb	(	IN PIRP_CONTEXT	IrpContext,
		IN PVCB	Vcb
	)

Definition at line 270 of file verfysup.c.

{
    BOOLEAN DevMarkedForVerify;
 
    PAGED_CODE();
 
    DebugTrace(+1, Dbg, "FatVerifyVcb, Vcb = %p\n", Vcb );
 
    //
    //  If the verify volume flag in the device object is set
    //  this means the media has potentially changed.
    //
    //  Note that we only force this ping for create operations.
    //  For others we take a sporting chance.  If in the end we
    //  have to physically access the disk, the right thing will happen.
    //
 
    DevMarkedForVerify = BooleanFlagOn(Vcb->Vpb->RealDevice->Flags, DO_VERIFY_VOLUME);
 
    //
    //  We ALWAYS force CREATE requests on unmounted volumes through the
    //  verify path.  These requests could have been in limbo between
    //  IoCheckMountedVpb and us, when a verify/mount took place and caused
    //  a completely different fs/volume to be mounted.  In this case the
    //  checks above may not have caught the condition, since we may already
    //  have verified (wrong volume) and decided that we have nothing to do.
    //  We want the requests to be re routed to the currently mounted volume,
    //  since they were directed at the 'drive',  not our volume.  So we take
    //  the verify path for synchronisation,  and the request will eventually
    //  be bounced back to IO with STATUS_REPARSE by our verify handler.
    //
 
    if (!DevMarkedForVerify &&
        (IrpContext->MajorFunction == IRP_MJ_CREATE) &&
        (IrpContext->OriginatingIrp != NULL)) {
 
        PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation( IrpContext->OriginatingIrp);
 
        if ((IrpSp->FileObject->RelatedFileObject == NULL) &&
            (Vcb->VcbCondition == VcbNotMounted)) {
 
            DevMarkedForVerify = TRUE;
        }
    }
 
    //
    //  Raise any error condition otherwise.
    //
 
    if (DevMarkedForVerify) {
 
        DebugTrace(0, Dbg, "The Vcb needs to be verified\n", 0);
 
        IoSetHardErrorOrVerifyDevice( IrpContext->OriginatingIrp,
                                      Vcb->Vpb->RealDevice );
 
        FatNormalizeAndRaiseStatus( IrpContext, STATUS_VERIFY_REQUIRED );
    }
 
    //
    //  Check the operation is legal for current Vcb state.
    //
 
    FatQuickVerifyVcb( IrpContext, Vcb );
 
    DebugTrace(-1, Dbg, "FatVerifyVcb -> VOID\n", 0);
}

Referenced by FatFlushFat(), FatIsVolumeDirty(), and FatIsVolumeMounted().