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NT4/private/ntos/fastfat/verfysup.c
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2020-09-30 17:12:29 +02:00

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/*++
Copyright (c) 1989 Microsoft Corporation
Module Name:
VerfySup.c
Abstract:
This module implements the Fat Verify volume and fcb/dcb support
routines
Author:
Gary Kimura [GaryKi] 01-Jun-1990
Revision History:
--*/
#include "FatProcs.h"
//
// The Bug check file id for this module
//
#define BugCheckFileId (FAT_BUG_CHECK_VERFYSUP)
//
// The Debug trace level for this module
//
#define Dbg (DEBUG_TRACE_VERFYSUP)
//
// Local procedure prototypes
//
VOID
FatResetFcb (
IN PIRP_CONTEXT IrpContext,
IN PFCB Fcb
);
VOID
FatDetermineAndMarkFcbCondition (
IN PIRP_CONTEXT IrpContext,
IN PFCB Fcb
);
VOID
FatDeferredCleanVolume (
PVOID Parameter
);
NTSTATUS
FatMarkVolumeCompletionRoutine(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp,
IN PVOID Contxt
);
#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, FatCheckDirtyBit)
#pragma alloc_text(PAGE, FatVerifyOperationIsLegal)
#pragma alloc_text(PAGE, FatDeferredCleanVolume)
#pragma alloc_text(PAGE, FatDetermineAndMarkFcbCondition)
#pragma alloc_text(PAGE, FatQuickVerifyVcb)
#pragma alloc_text(PAGE, FatPerformVerify)
#pragma alloc_text(PAGE, FatMarkFcbCondition)
#pragma alloc_text(PAGE, FatMarkVolumeClean)
#pragma alloc_text(PAGE, FatResetFcb)
#pragma alloc_text(PAGE, FatVerifyVcb)
#pragma alloc_text(PAGE, FatVerifyFcb)
#endif
VOID
FatMarkFcbCondition (
IN PIRP_CONTEXT IrpContext,
IN PFCB Fcb,
IN FCB_CONDITION FcbCondition
)
/*++
Routine Description:
This routines marks the entire Fcb/Dcb structure from Fcb down with
FcbCondition.
Arguments:
Fcb - Supplies the Fcb/Dcb being marked
FcbCondition - Supplies the setting to use for the Fcb Condition
Return Value:
None.
--*/
{
DebugTrace(+1, Dbg, "FatMarkFcbCondition, Fcb = %08lx\n", Fcb );
//
// If we are marking this Fcb something other than Good, we will need
// to have the Vcb exclusive.
ASSERT( FcbCondition != FcbNeedsToBeVerified ? TRUE :
FatVcbAcquiredExclusive(IrpContext, Fcb->Vcb) );
//
// If this is a PagingFile it has to be good.
//
if (FlagOn(Fcb->FcbState, FCB_STATE_PAGING_FILE)) {
Fcb->FcbCondition = FcbGood;
return;
}
//
// Update the condition of the Fcb.
//
Fcb->FcbCondition = FcbCondition;
DebugTrace(0, Dbg, "MarkFcb: %Z\n", &Fcb->FullFileName);
//
// This FastIo flag is based on FcbCondition, so update it now.
//
Fcb->Header.IsFastIoPossible = FatIsFastIoPossible( 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)) &&
((Fcb->Header.NodeTypeCode == FAT_NTC_DCB) ||
(Fcb->Header.NodeTypeCode == FAT_NTC_ROOT_DCB)) ) {
PFCB OriginalFcb = Fcb;
while ( (Fcb = FatGetNextFcb(IrpContext, Fcb, OriginalFcb)) != NULL ) {
DebugTrace(0, Dbg, "MarkFcb: %Z\n", &Fcb->FullFileName);
Fcb->FcbCondition = FcbCondition;
Fcb->Header.IsFastIoPossible = FatIsFastIoPossible( Fcb );
}
}
DebugTrace(-1, Dbg, "FatMarkFcbCondition -> VOID\n", 0);
return;
}
VOID
FatVerifyVcb (
IN PIRP_CONTEXT IrpContext,
IN PVCB Vcb
)
/*++
Routine Description:
This routines verifies that the Vcb still denotes a valid Volume
If the Vcb is bad it raises an error condition.
Arguments:
Vcb - Supplies the Vcb being verified
Return Value:
None.
--*/
{
ULONG ChangeCount = 0;
DebugTrace(+1, Dbg, "FatVerifyVcb, Vcb = %08lx\n", Vcb );
//
// If the media is removable and the verify volume flag in the
// device object is not set then we want to ping the device
// to see if it needs to be verified.
//
// 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.
//
if ( FlagOn(Vcb->VcbState, VCB_STATE_FLAG_REMOVABLE_MEDIA) &&
!FlagOn(Vcb->Vpb->RealDevice->Flags, DO_VERIFY_VOLUME) ) {
PIRP Irp;
KEVENT Event;
IO_STATUS_BLOCK Iosb;
NTSTATUS Status;
KeInitializeEvent( &Event, NotificationEvent, FALSE );
Irp = IoBuildDeviceIoControlRequest( IOCTL_DISK_CHECK_VERIFY,
Vcb->TargetDeviceObject,
NULL,
0,
(PVOID)&ChangeCount,
sizeof(ChangeCount),
FALSE,
&Event,
&Iosb );
if ( Irp == NULL ) {
FatRaiseStatus( IrpContext, STATUS_INSUFFICIENT_RESOURCES );
}
Status = IoCallDriver( Vcb->TargetDeviceObject, Irp );
if (Status == STATUS_PENDING) {
Status = KeWaitForSingleObject( &Event,
Executive,
KernelMode,
FALSE,
NULL );
ASSERT( Status == STATUS_SUCCESS );
//
// This may raise an error.
//
if ( !NT_SUCCESS(Iosb.Status) ) {
FatNormalizeAndRaiseStatus( IrpContext, Iosb.Status );
}
} else {
//
// This may raise an error.
//
if ( !NT_SUCCESS(Status) ) {
FatNormalizeAndRaiseStatus( IrpContext, Status );
}
}
if (ChangeCount != Vcb->ChangeCount) {
//
// The disk driver lost a media change event, possibly
// because it was eaten by a user request before the
// volume was mounted. We set things up as they would
// be if the driver had returned VERIFY_REQUIRED.
//
Vcb->ChangeCount = ChangeCount;
IoSetDeviceToVerify( PsGetCurrentThread(), Vcb->TargetDeviceObject );
SetFlag( Vcb->TargetDeviceObject->Flags, DO_VERIFY_VOLUME );
FatNormalizeAndRaiseStatus( IrpContext, STATUS_VERIFY_REQUIRED );
}
}
//
// Now that the verify bit has been appropriately set, check the Vcb.
//
FatQuickVerifyVcb( IrpContext, Vcb );
DebugTrace(-1, Dbg, "FatVerifyVcb -> VOID\n", 0);
return;
}
VOID
FatVerifyFcb (
IN PIRP_CONTEXT IrpContext,
IN PFCB Fcb
)
/*++
Routine Description:
This routines verifies that the Fcb still denotes the same file.
If the Fcb is bad it raises a error condition.
Arguments:
Fcb - Supplies the Fcb being verified
Return Value:
None.
--*/
{
PFCB CurrentFcb;
DebugTrace(+1, Dbg, "FatVerifyFcb, Vcb = %08lx\n", Fcb );
//
// If this is the Fcb of a deleted dirent or our parent is deleted,
// no-op this call with the hope that the caller will do the right thing.
//
if (IsFileDeleted( IrpContext, Fcb ) ||
((NodeType(Fcb) != FAT_NTC_ROOT_DCB) &&
IsFileDeleted( IrpContext, Fcb->ParentDcb ))) {
return;
}
//
// If we are not in the process of doing a verify,
// first do a quick spot check on the Vcb.
//
if ( Fcb->Vcb->VerifyThread != KeGetCurrentThread() ) {
FatQuickVerifyVcb( IrpContext, Fcb->Vcb );
}
//
// Now based on the condition of the Fcb we'll either return
// immediately to the caller, raise a condition, or do some work
// to verify the Fcb.
//
switch (Fcb->FcbCondition) {
case FcbGood:
DebugTrace(0, Dbg, "The Fcb is good\n", 0);
break;
case FcbBad:
FatRaiseStatus( IrpContext, STATUS_FILE_INVALID );
break;
case FcbNeedsToBeVerified:
//
// We loop here checking our ancestors until we hit an Fcb which
// is either good or bad.
//
CurrentFcb = Fcb;
while (CurrentFcb->FcbCondition == FcbNeedsToBeVerified) {
FatDetermineAndMarkFcbCondition(IrpContext, CurrentFcb);
//
// If this Fcb didn't make it, or it was the Root Dcb, exit
// the loop now, else continue with out parent.
//
if ( (CurrentFcb->FcbCondition != FcbGood) ||
(NodeType(CurrentFcb) == FAT_NTC_ROOT_DCB) ) {
break;
}
CurrentFcb = CurrentFcb->ParentDcb;
}
//
// Now we can just look at ourselves to see how we did.
//
if (Fcb->FcbCondition != FcbGood) {
FatRaiseStatus( IrpContext, STATUS_FILE_INVALID );
}
break;
default:
DebugDump("Invalid FcbCondition\n", 0, Fcb);
FatBugCheck( Fcb->FcbCondition, 0, 0 );
}
DebugTrace(-1, Dbg, "FatVerifyFcb -> VOID\n", 0);
return;
}
VOID
FatDeferredCleanVolume (
PVOID Parameter
)
/*++
Routine Description:
This is the routine that performs the actual FatMarkVolumeClean call.
It assures that the target volume still exists as there ia a race
condition between queueing the ExWorker item and volumes going away.
Arguments:
Parameter - Points to a clean volume packet that was allocated from pool
Return Value:
None.
--*/
{
PCLEAN_AND_DIRTY_VOLUME_PACKET Packet;
PLIST_ENTRY Links;
PVCB Vcb;
IRP_CONTEXT IrpContext;
BOOLEAN VcbExists = FALSE;
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.
//
FatAcquireSharedGlobal( &IrpContext );
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) ) {
try {
if (!FlagOn(Vcb->VcbState, VCB_STATE_FLAG_MOUNTED_DIRTY)) {
FatMarkVolumeClean( &IrpContext, Vcb );
}
//
// Check for a pathelogical race condition, and fix it.
//
if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_VOLUME_DIRTY)) {
FatMarkVolumeDirty( &IrpContext, Vcb, FALSE );
} 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 );
}
}
} except( FsRtlIsNtstatusExpected(GetExceptionCode()) ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH ) {
NOTHING;
}
}
//
// Release the global resource, unpin and repinned Bcbs and return.
//
FatReleaseGlobal( &IrpContext );
try {
FatUnpinRepinnedBcbs( &IrpContext );
} except( FsRtlIsNtstatusExpected(GetExceptionCode()) ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH ) {
NOTHING;
}
IoSetTopLevelIrp( NULL );
//
// and finally free the packet.
//
ExFreePool( Packet );
return;
}
VOID
FatCleanVolumeDpc (
IN PKDPC Dpc,
IN PVOID DeferredContext,
IN PVOID SystemArgument1,
IN PVOID SystemArgument2
)
/*++
Routine Description:
This routine is dispatched 5 seconds after the last disk structure was
modified in a specific volume, and exqueues an execuative worker thread
to perform the actual task of marking the volume dirty.
Arguments:
DefferedContext - Contains the Vcb to process.
Return Value:
None.
--*/
{
PVCB Vcb;
PCLEAN_AND_DIRTY_VOLUME_PACKET Packet;
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 = ExAllocatePool(NonPagedPool, sizeof(CLEAN_AND_DIRTY_VOLUME_PACKET));
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 );
ExQueueWorkItem( &Packet->Item, CriticalWorkQueue );
}
return;
}
VOID
FatMarkVolumeClean (
IN PIRP_CONTEXT IrpContext,
IN PVCB Vcb
)
/*++
Routine Description:
This routine marks the indicated fat volume as clean, but only if it is
a non-removable media. The volume is marked dirty by setting the first
reserved byte of the first dirent in the root directory to 0.
Arguments:
Vcb - Supplies the Vcb being modified
Return Value:
None.
--*/
{
PPACKED_BOOT_SECTOR BootSector;
PBCB BootSectorBcb;
KEVENT Event;
PIRP Irp;
NTSTATUS Status;
DebugTrace(+1, Dbg, "FatMarkVolumeClean, Vcb = %08lx\n", Vcb);
Irp = NULL;
BootSectorBcb = NULL;
//
// If we were called for a floppy, return immediately
//
if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_FLOPPY)) {
return;
}
//
// Bail if we get an IO error.
//
try {
ULONG PinLength;
//
// If the FAT table is 12-bit then our strategy is to pin the entire
// thing when any of it is modified. Here we're going to pin the
// first page, so in the 12-bit case we also want to pin the rest
// of the FAT table.
//
if (Vcb->AllocationSupport.FatIndexBitSize == 12) {
PinLength = FatReservedBytes(&Vcb->Bpb) + FatBytesPerFat(&Vcb->Bpb);
} else {
PinLength = sizeof(PACKED_BOOT_SECTOR);
}
//
// Call Cc directly here so that FatReadDirectoryFile doesn't
// have to be resident.
//
CcPinRead( Vcb->VirtualVolumeFile,
&FatLargeZero,
PinLength,
TRUE,
&BootSectorBcb,
(PVOID *)&BootSector );
DbgDoit( IrpContext->PinCount += 1 )
//
// Set the volume Clean.
//
ClearFlag( BootSector->CurrentHead, FAT_BOOT_SECTOR_DIRTY );
//
// Initialize the event we're going to use
//
KeInitializeEvent( &Event, NotificationEvent, FALSE );
//
// Build the irp for the operation and also set the overrride flag.
// Note that we may be at APC level, so do this asyncrhonously and
// use an event for synchronization as normal request completion
// cannot occur at APC level.
//
Irp = IoBuildAsynchronousFsdRequest( IRP_MJ_WRITE,
Vcb->TargetDeviceObject,
(PVOID)BootSector,
1 << Vcb->AllocationSupport.LogOfBytesPerSector,
&FatLargeZero,
NULL );
if ( Irp == NULL ) {
try_return(NOTHING);
}
//
// Set up the completion routine
//
IoSetCompletionRoutine( Irp,
FatMarkVolumeCompletionRoutine,
&Event,
TRUE,
TRUE,
TRUE );
//
// Call the device to do the write and wait for it to finish.
// Igmore any return status.
//
#ifdef WE_WON_ON_APPEAL
Status = (Vcb->Dscb != NULL) ?
FatLowLevelDblsReadWrite( IrpContext, Irp, Vcb ) :
IoCallDriver( Vcb->TargetDeviceObject, Irp );
#else
Status = IoCallDriver( Vcb->TargetDeviceObject, Irp );
#endif // WE_WON_ON_APPEAL
if (Status == STATUS_PENDING) {
(VOID)KeWaitForSingleObject( &Event, Executive, KernelMode, FALSE, (PLARGE_INTEGER)NULL );
}
try_exit: NOTHING;
} finally {
//
// Clean up the Irp and Mdl
//
if (Irp) {
//
// If there is an MDL (or MDLs) associated with this I/O
// request, Free it (them) here. This is accomplished by
// walking the MDL list hanging off of the IRP and deallocating
// each MDL encountered.
//
while (Irp->MdlAddress != NULL) {
PMDL NextMdl;
NextMdl = Irp->MdlAddress->Next;
MmUnlockPages( Irp->MdlAddress );
IoFreeMdl( Irp->MdlAddress );
Irp->MdlAddress = NextMdl;
}
IoFreeIrp( Irp );
}
if (BootSectorBcb != NULL) {
FatUnpinBcb( IrpContext, BootSectorBcb );
}
}
DebugTrace(-1, Dbg, "FatMarkVolumeClean -> VOID\n", 0);
return;
}
VOID
FatFspMarkVolumeDirtyWithRecover(
PVOID Parameter
)
/*++
Routine Description:
This is the routine that performs the actual FatMarkVolumeDirty call
on of paging file Io that encounters a media error. It is responsible
for completing the PagingIo Irp as soon as this is done.
Note: this routine (and thus FatMarkVolumeDirty() must be resident as
the paging file might be damaged at this point.
Arguments:
Parameter - Points to a dirty volume packet that was allocated from pool
Return Value:
None.
--*/
{
PCLEAN_AND_DIRTY_VOLUME_PACKET Packet;
PVCB Vcb;
IRP_CONTEXT IrpContext;
PIRP Irp;
BOOLEAN VcbExists = FALSE;
DebugTrace(+1, Dbg, "FatDeferredCleanVolume\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.
//
try {
SetFlag( Vcb->VcbState, VCB_STATE_FLAG_MOUNTED_DIRTY );
FatMarkVolumeDirty( &IrpContext, Vcb, TRUE );
} except(FatExceptionFilter( &IrpContext, GetExceptionInformation() )) {
NOTHING;
}
IoSetTopLevelIrp( NULL );
//
// Now complete the originating Irp
//
IoCompleteRequest( Irp, IO_DISK_INCREMENT );
}
VOID
FatMarkVolumeDirty (
IN PIRP_CONTEXT IrpContext,
IN PVCB Vcb,
IN BOOLEAN PerformSurfaceTest
)
/*++
Routine Description:
This routine marks the indicated fat volume as dirty, but only if it is
a non-removable media. The volume is marked dirty by setting the first
reserved byte of the first dirent in the root directory to 1.
Arguments:
Vcb - Supplies the Vcb being modified
PerformSurfaceTest - Indicates to autochk that we think the media may be
defective and that a surface test should be performed.
Return Value:
None.
--*/
{
PPACKED_BOOT_SECTOR BootSector;
PBCB BootSectorBcb;
KEVENT Event;
PIRP Irp;
NTSTATUS Status;
DebugTrace(+1, Dbg, "FatMarkVolumeDirty, Vcb = %08lx\n", Vcb);
Irp = NULL;
BootSectorBcb = NULL;
//
// If we were called for a floppy, return immediately
//
if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_FLOPPY)) {
return;
}
//
// Bail if we get an IO error.
//
try {
ULONG PinLength;
//
// If the FAT table is 12-bit then our strategy is to pin the entire
// thing when any of it is modified. Here we're going to pin the
// first page, so in the 12-bit case we also want to pin the rest
// of the FAT table.
//
if (Vcb->AllocationSupport.FatIndexBitSize == 12) {
PinLength = FatReservedBytes(&Vcb->Bpb) + FatBytesPerFat(&Vcb->Bpb);
} else {
PinLength = sizeof(PACKED_BOOT_SECTOR);
}
//
// Call Cc directly here so that FatReadDirectoryFile doesn't
// have to be resident.
//
CcPinRead( Vcb->VirtualVolumeFile,
&FatLargeZero,
PinLength,
TRUE,
&BootSectorBcb,
(PVOID *)&BootSector );
DbgDoit( IrpContext->PinCount += 1 )
//
// Set the volume dirty.
//
SetFlag( BootSector->CurrentHead, FAT_BOOT_SECTOR_DIRTY );
//
// In addition, if this request received an error that may indicate
// media corruption, have autochk perform a surface test.
//
if ( PerformSurfaceTest ) {
SetFlag( BootSector->CurrentHead, FAT_BOOT_SECTOR_TEST_SURFACE );
}
//
// Initialize the event we're going to use
//
KeInitializeEvent( &Event, NotificationEvent, FALSE );
//
// Build the irp for the operation and also set the overrride flag.
// Note that we may be at APC level, so do this asyncrhonously and
// use an event for synchronization as normal request completion
// cannot occur at APC level.
//
Irp = IoBuildAsynchronousFsdRequest( IRP_MJ_WRITE,
Vcb->TargetDeviceObject,
(PVOID)BootSector,
1 << Vcb->AllocationSupport.LogOfBytesPerSector,
&FatLargeZero,
NULL );
if ( Irp == NULL ) {
FatRaiseStatus( IrpContext, STATUS_INSUFFICIENT_RESOURCES );
}
//
// Set up the completion routine
//
IoSetCompletionRoutine( Irp,
FatMarkVolumeCompletionRoutine,
&Event,
TRUE,
TRUE,
TRUE );
//
// Call the device to do the write and wait for it to finish.
//
#ifdef WE_WON_ON_APPEAL
Status = (Vcb->Dscb != NULL) ?
FatLowLevelDblsReadWrite( IrpContext, Irp, Vcb ) :
IoCallDriver( Vcb->TargetDeviceObject, Irp );
#else
Status = IoCallDriver( Vcb->TargetDeviceObject, Irp );
#endif // WE_WON_ON_APPEAL
if (Status == STATUS_PENDING) {
(VOID)KeWaitForSingleObject( &Event, Executive, KernelMode, FALSE, (PLARGE_INTEGER)NULL );
}
//
// Grab the Status.
//
Status = Irp->IoStatus.Status;
//
// Raise any error status
//
if (!NT_SUCCESS(Status)) {
FatNormalizeAndRaiseStatus( IrpContext, Status );
}
} finally {
//
// Clean up the Irp and Mdl
//
if (Irp) {
//
// If there is an MDL (or MDLs) associated with this I/O
// request, Free it (them) here. This is accomplished by
// walking the MDL list hanging off of the IRP and deallocating
// each MDL encountered.
//
while (Irp->MdlAddress != NULL) {
PMDL NextMdl;
NextMdl = Irp->MdlAddress->Next;
MmUnlockPages( Irp->MdlAddress );
IoFreeMdl( Irp->MdlAddress );
Irp->MdlAddress = NextMdl;
}
IoFreeIrp( Irp );
}
if (BootSectorBcb != NULL) {
FatUnpinBcb( IrpContext, BootSectorBcb );
}
}
DebugTrace(-1, Dbg, "FatMarkVolumeDirty -> VOID\n", 0);
return;
}
VOID
FatCheckDirtyBit (
IN PIRP_CONTEXT IrpContext,
IN PVCB Vcb
)
/*++
Routine Description:
This routine looks at the volume dirty bit, and depending on the state of
VCB_STATE_FLAG_MOUNTED_DIRTY, the appropriate action is taken.
Arguments:
Vcb - Supplies the Vcb being queried.
Return Value:
None.
--*/
{
BOOLEAN Dirty;
PPACKED_BOOT_SECTOR BootSector;
PBCB BootSectorBcb;
UNICODE_STRING VolumeLabel;
//
// Look in the boot sector
//
FatReadVolumeFile( IrpContext,
Vcb,
0,
sizeof(PACKED_BOOT_SECTOR),
&BootSectorBcb,
(PVOID *)&BootSector );
try {
//
// Check if the magic bit is set
//
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 ) {
KdPrint(("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)) {
KdPrint(("FASTFAT: Volume %Z has been cleaned.\n", &VolumeLabel));
ClearFlag( Vcb->VcbState, VCB_STATE_FLAG_MOUNTED_DIRTY );
} else {
(VOID)FsRtlBalanceReads( Vcb->TargetDeviceObject );
}
}
} finally {
FatUnpinBcb( IrpContext, BootSectorBcb );
}
}
VOID
FatVerifyOperationIsLegal (
IN PIRP_CONTEXT IrpContext
)
/*++
Routine Description:
This routine determines is the requested operation should be allowed to
continue. It either returns to the user if the request is Okay, or
raises an appropriate status.
Arguments:
Irp - Supplies the Irp to check
Return Value:
None.
--*/
{
PIRP Irp;
PFILE_OBJECT FileObject;
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;
}
//
// Internal support routine
//
VOID
FatResetFcb (
IN PIRP_CONTEXT IrpContext,
IN PFCB Fcb
)
/*++
Routine Description:
This routine is called when an Fcb has been marked as needs to be verified.
It does the following tasks:
- Reset Mcb mapping information
- For directories, reset dirent hints
- Set allocation size to unknown
Arguments:
Fcb - Supplies the Fcb to reset
Return Value:
None.
--*/
{
//
// Don't do the two following operations for the Root Dcb.
//
if ( NodeType(Fcb) != FAT_NTC_ROOT_DCB ) {
POOL_TYPE PoolType;
//
// If this happens to be a paging file, use non-paged pool for the FCB
//
if ( FlagOn( Fcb->FcbState, FCB_STATE_PAGING_FILE ) ) {
PoolType = NonPagedPool;
} else {
PoolType = PagedPool;
}
//
// Reset the mcb mapping.
//
FsRtlRemoveMcbEntry( &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 = (LONG)-1;
}
}
//
// 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;
}
}
//
// Internal support routine
//
VOID
FatDetermineAndMarkFcbCondition (
IN PIRP_CONTEXT IrpContext,
IN PFCB Fcb
)
/*++
Routine Description:
This routine checks a specific Fcb to see if it is different from what's
on the disk. The following things are checked:
- File Name
- File Size (if not directory)
- First Cluster Of File
- Dirent Attributes
Arguments:
Fcb - Supplies the Fcb to examine
Return Value:
None.
--*/
{
PDIRENT Dirent;
PBCB DirentBcb;
OEM_STRING Name;
CHAR Buffer[16];
//
// If this is the Root Dcb, special case it. That is, we know
// by definition that it is good since it is fixed in the volume
// structure.
//
if ( NodeType(Fcb) == FAT_NTC_ROOT_DCB ) {
FatResetFcb( IrpContext, Fcb );
FatMarkFcbCondition( IrpContext, Fcb, FcbGood );
return;
}
// The first thing we need to do to verify ourselves is
// locate the dirent on the disk.
//
FatGetDirentFromFcbOrDcb( IrpContext,
Fcb,
&Dirent,
&DirentBcb );
//
// We located the dirent for ourselves now make sure it
// is really ours by comparing the Name and FatFlags.
// Then for a file we also check the file size.
//
// Note that we have to unpin the Bcb before calling FatResetFcb
// in order to avoid a deadlock in CcUninitializeCacheMap.
//
try {
Name.MaximumLength = 16;
Name.Buffer = &Buffer[0];
Fat8dot3ToString( IrpContext, Dirent, FALSE, &Name );
if (!RtlEqualString( &Name, &Fcb->ShortName.Name.Oem, TRUE )
||
( (NodeType(Fcb) == FAT_NTC_FCB) &&
(Fcb->Header.FileSize.LowPart != Dirent->FileSize) )
||
((ULONG)Dirent->FirstClusterOfFile != Fcb->FirstClusterOfFile)
||
(Dirent->Attributes != Fcb->DirentFatFlags) ) {
FatMarkFcbCondition( IrpContext, Fcb, FcbBad );
} else {
//
// We passed. Get the Fcb ready to use again.
//
FatResetFcb( IrpContext, Fcb );
FatMarkFcbCondition( IrpContext, Fcb, FcbGood );
}
} finally {
FatUnpinBcb( IrpContext, DirentBcb );
}
return;
}
//
// Internal support routine
//
VOID
FatQuickVerifyVcb (
IN PIRP_CONTEXT IrpContext,
IN PVCB Vcb
)
/*++
Routine Description:
This routines just checks the verify bit in the real device and the
Vcb condition and raises an appropriate exception if so warented.
It is called when verifying both Fcbs and Vcbs.
Arguments:
Vcb - Supplies the Vcb to check the condition of.
Return Value:
None.
--*/
{
//
// 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))) {
//
// 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 );
SetFlag(Vcb->Vpb->RealDevice->Flags, DO_VERIFY_VOLUME);
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 );
SetFlag(Vcb->Vpb->RealDevice->Flags, DO_VERIFY_VOLUME);
FatRaiseStatus( IrpContext, STATUS_WRONG_VOLUME );
break;
case VcbBad:
DebugTrace(0, Dbg, "The Vcb is bad\n", 0);
FatRaiseStatus( IrpContext, STATUS_FILE_INVALID );
break;
default:
DebugDump("Invalid VcbCondition\n", 0, Vcb);
FatBugCheck( Vcb->VcbCondition, 0, 0 );
}
}
NTSTATUS
FatPerformVerify (
IN PIRP_CONTEXT IrpContext,
IN PIRP Irp,
IN PDEVICE_OBJECT Device
)
/*++
Routine Description:
This routines performs an IoVerifyVolume operation and takes the
appropriate action. After the Verify is complete the originating
Irp is sent off to an Ex Worker Thread. This routine is called
from the exception handler.
Arguments:
Irp - The irp to send off after all is well and done.
Device - The real device needing verification.
Return Value:
None.
--*/
{
PVCB Vcb;
NTSTATUS Status = STATUS_SUCCESS;
PIO_STACK_LOCATION IrpSp;
//
// Check if this Irp has a status of Verify required and if it does
// then call the I/O system to do a verify.
//
// Skip the IoVerifyVolume if this is a mount or verify request
// itself. Trying a recursive mount will cause a deadlock with
// the DeviceObject->DeviceLock.
//
if ( (IrpContext->MajorFunction == IRP_MJ_FILE_SYSTEM_CONTROL)
&&
((IrpContext->MinorFunction == IRP_MN_MOUNT_VOLUME) ||
(IrpContext->MinorFunction == IRP_MN_VERIFY_VOLUME)) ) {
return FatFsdPostRequest( IrpContext, Irp );
}
DebugTrace(0, Dbg, "Verify Required, DeviceObject = %08lx\n", Device);
//
// Extract a pointer to the Vcb from the VolumeDeviceObject.
// Note that since we have specifically excluded mount,
// requests, we know that IrpSp->DeviceObject is indeed a
// volume device object.
//
IrpSp = IoGetCurrentIrpStackLocation(Irp);
Vcb = &CONTAINING_RECORD( IrpSp->DeviceObject,
VOLUME_DEVICE_OBJECT,
DeviceObject )->Vcb;
//
// Check if the volume still thinks it needs to be verified,
// if it doesn't then we can skip doing a verify because someone
// else beat us to it.
//
try {
if (FlagOn(Device->Flags, DO_VERIFY_VOLUME)) {
PFILE_OBJECT FileObject = IoGetCurrentIrpStackLocation(Irp)->FileObject;
BOOLEAN AllowRawMount;
#ifdef WE_WON_ON_APPEAL
PLIST_ENTRY Links;
#endif // WE_WON_ON_APPEAL
//
// We will allow Raw to mount this volume if we were doing a
// a DASD open.
//
if ( (IrpContext->MajorFunction == IRP_MJ_CREATE) &&
(IrpSp->FileObject->FileName.Length == 0) &&
(IrpSp->FileObject->RelatedFileObject == NULL) ) {
AllowRawMount = TRUE;
} else {
AllowRawMount = FALSE;
}
//
// If the IopMount in IoVerifyVolume did something, and
// this is an absolute open, force a reparse.
//
Status = IoVerifyVolume( Device, AllowRawMount );
//
// If the verify operation completed it will return
// either STATUS_SUCCESS or STATUS_WRONG_VOLUME, exactly.
//
// If FatVerifyVolume encountered an error during
// processing, it will return that error. If we got
// STATUS_WRONG_VOLUME from the verfy, and our volume
// is now mounted, commute the status to STATUS_SUCCESS.
//
if ( (Status == STATUS_WRONG_VOLUME) &&
(Vcb->VcbCondition == VcbGood) ) {
Status = STATUS_SUCCESS;
}
//
// Do a quick unprotected check here. The routine will do
// a safe check. After here we can release the resource.
// Note that if the volume really went away, we will be taking
// the Reparse path.
//
(VOID)FatAcquireExclusiveGlobal( IrpContext );
#ifdef WE_WON_ON_APPEAL
//
// It is possible we were called with a double space Vcb.
// We need to start with the Parent Vcb at this point.
//
if (Vcb->Dscb) {
Vcb = Vcb->Dscb->ParentVcb;
}
//
// First run through any mounted DBLS volumes. Note that we
// have to get the next Flink before calling FatCheckForDismount
// incase the Vcb goes away.
//
(VOID)FatAcquireExclusiveVcb( IrpContext, Vcb );
for (Links = Vcb->ParentDscbLinks.Flink;
Links != &Vcb->ParentDscbLinks; ) {
PVCB ChildVcb;
ChildVcb = CONTAINING_RECORD( Links, DSCB, ChildDscbLinks )->Vcb;
Links = Links->Flink;
ASSERT( ChildVcb->Vpb->RealDevice == Vcb->Vpb->RealDevice );
if ( ((ChildVcb->VcbCondition == VcbNotMounted) ||
(ChildVcb->VcbCondition == VcbBad)) &&
(ChildVcb->OpenFileCount == 0) ) {
(VOID)FatCheckForDismount( IrpContext, ChildVcb );
}
}
FatReleaseVcb( IrpContext, Vcb );
#endif // WE_WON_ON_APPEAL
if ( ((Vcb->VcbCondition == VcbNotMounted) ||
(Vcb->VcbCondition == VcbBad)) &&
(Vcb->OpenFileCount == 0) ) {
(VOID)FatCheckForDismount( IrpContext, Vcb );
}
FatReleaseGlobal( IrpContext );
if ((IrpContext->MajorFunction == IRP_MJ_CREATE) &&
(FileObject->RelatedFileObject == NULL) &&
((Status == STATUS_SUCCESS) || (Status == STATUS_WRONG_VOLUME))) {
Irp->IoStatus.Information = IO_REMOUNT;
FatCompleteRequest( IrpContext, Irp, STATUS_REPARSE );
Status = STATUS_REPARSE;
Irp = NULL;
}
if ( (Irp != NULL) && !NT_SUCCESS(Status) ) {
//
// Fill in the device object if required.
//
if ( IoIsErrorUserInduced( Status ) ) {
IoSetHardErrorOrVerifyDevice( Irp, Device );
}
FatNormalizeAndRaiseStatus( IrpContext, Status );
}
} else {
DebugTrace(0, Dbg, "Volume no longer needs verification\n", 0);
}
//
// If there is still an Irp, send it off to an Ex Worker thread.
//
if ( Irp != NULL ) {
Status = FatFsdPostRequest( IrpContext, Irp );
}
} except(FatExceptionFilter( IrpContext, GetExceptionInformation() )) {
//
// We had some trouble trying to perform the verify or raised
// an error ourselves. So we'll abort the I/O request with
// the error status that we get back from the execption code.
//
Status = FatProcessException( IrpContext, Irp, GetExceptionCode() );
}
return Status;
}
//
// Local support routine
//
NTSTATUS
FatMarkVolumeCompletionRoutine(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp,
IN PVOID Contxt
)
{
//
// 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;
}
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