NTSTATUS
CdPerformVerify (
IN PIRP_CONTEXT IrpContext,
IN PIRP Irp,
IN PDEVICE_OBJECT DeviceToVerify
)
/*++
Routine Description:
This routines performs an IoVerifyVolume operation and takes the
appropriate action. If the verify is successful then we send the originating
Irp off to an Ex Worker Thread. This routine is called from the exception handler.
No file system resources are held when this routine is called.
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;
ASSERT_IRP_CONTEXT( IrpContext );
ASSERT_IRP( Irp );
//
// 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 CdFsdPostRequest( IrpContext, Irp );
}
//
// 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;
try {
//
// Send down the verify FSCTL. Note that this is sent to the
// currently mounted volume, which may not be this one.
//
// We will allow Raw to mount this volume if we were doing a
// an absolute DASD open.
//
Status = IoVerifyVolume( DeviceToVerify, CdOperationIsDasdOpen( IrpContext));
//
// Acquire the Vcb so we're working with a stable VcbCondition.
//
CdAcquireVcbShared( IrpContext, Vcb, FALSE);
//
// If the verify operation completed it will return
// either STATUS_SUCCESS or STATUS_WRONG_VOLUME, exactly.
//
// If CdVerifyVolume encountered an error during
// processing, it will return that error. If we got
// STATUS_WRONG_VOLUME from the verify, and our volume
// is now mounted, commute the status to STATUS_SUCCESS.
//
if ((Status == STATUS_WRONG_VOLUME) &&
(Vcb->VcbCondition == VcbMounted)) {
Status = STATUS_SUCCESS;
}
else if ((STATUS_SUCCESS == Status) && (Vcb->VcbCondition != VcbMounted)) {
//
// If the verify succeeded, but our volume is not mounted,
// then some other volume is on the device.
//
Status = STATUS_WRONG_VOLUME;
}
//
// 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.
//
//
// If the device might need to go away then call our dismount routine.
//
if (((Vcb->VcbCondition == VcbNotMounted) ||
(Vcb->VcbCondition == VcbInvalid) ||
(Vcb->VcbCondition == VcbDismountInProgress)) &&
(Vcb->VcbReference <= CDFS_RESIDUAL_REFERENCE)) {
CdReleaseVcb( IrpContext, Vcb);
CdAcquireCdData( IrpContext );
CdCheckForDismount( IrpContext, Vcb, FALSE );
CdReleaseCdData( IrpContext );
}
else {
CdReleaseVcb( IrpContext, Vcb);
}
//
// If this is a create and the verify succeeded then complete the
// request with a REPARSE status.
//
if ((IrpContext->MajorFunction == IRP_MJ_CREATE) &&
(IrpSp->FileObject->RelatedFileObject == NULL) &&
((Status == STATUS_SUCCESS) || (Status == STATUS_WRONG_VOLUME))) {
Irp->IoStatus.Information = IO_REMOUNT;
CdCompleteRequest( IrpContext, Irp, STATUS_REPARSE );
Status = STATUS_REPARSE;
Irp = NULL;
IrpContext = NULL;
//
// If there is still an error to process then call the Io system
// for a popup.
//
} else if ((Irp != NULL) && !NT_SUCCESS( Status )) {
//
// Fill in the device object if required.
//
if (IoIsErrorUserInduced( Status ) ) {
IoSetHardErrorOrVerifyDevice( Irp, DeviceToVerify );
}
CdNormalizeAndRaiseStatus( IrpContext, Status );
}
//
// If there is still an Irp, send it off to an Ex Worker thread.
//
if (IrpContext != NULL) {
Status = CdFsdPostRequest( IrpContext, Irp );
}
}
except(CdExceptionFilter( 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 = CdProcessException( IrpContext, Irp, GetExceptionCode() );
}
return Status;
}
__drv_mustHoldCriticalRegion
NTSTATUS
CdNotifyChangeDirectory (
__inout PIRP_CONTEXT IrpContext,
__inout PIRP Irp,
__in PIO_STACK_LOCATION IrpSp,
__in PCCB Ccb
)
/*++
Routine Description:
This routine performs the notify change directory operation. It is
responsible for either completing of enqueuing the input Irp. Although there
will never be a notify signalled on a CDROM disk we still support this call.
We have already checked that this is not an OpenById handle.
Arguments:
Irp - Supplies the Irp to process
IrpSp - Io stack location for this request.
Ccb - Handle to the directory being watched.
Return Value:
NTSTATUS - STATUS_PENDING, any other error will raise.
--*/
{
PAGED_CODE();
//
// Always set the wait bit in the IrpContext so the initial wait can't fail.
//
SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT );
//
// Acquire the Vcb shared.
//
CdAcquireVcbShared( IrpContext, IrpContext->Vcb, FALSE );
//
// Use a try-finally to facilitate cleanup.
//
try {
//
// Verify the Vcb.
//
CdVerifyVcb( IrpContext, IrpContext->Vcb );
//
// Call the Fsrtl package to process the request. We cast the
// unicode strings to ansi strings as the dir notify package
// only deals with memory matching.
//
FsRtlNotifyFullChangeDirectory( IrpContext->Vcb->NotifySync,
&IrpContext->Vcb->DirNotifyList,
Ccb,
(PSTRING) &IrpSp->FileObject->FileName,
BooleanFlagOn( IrpSp->Flags, SL_WATCH_TREE ),
FALSE,
IrpSp->Parameters.NotifyDirectory.CompletionFilter,
Irp,
NULL,
NULL );
} finally {
//
// Release the Vcb.
//
CdReleaseVcb( IrpContext, IrpContext->Vcb );
}
//
// Cleanup the IrpContext.
//
CdCompleteRequest( IrpContext, NULL, STATUS_SUCCESS );
return STATUS_PENDING;
}
BOOLEAN
CdCommonClosePrivate (
IN PIRP_CONTEXT IrpContext,
IN PVCB Vcb,
IN PFCB Fcb,
IN ULONG UserReference,
IN BOOLEAN FromFsd
)
/*++
Routine Description:
This is the worker routine for the close operation. We can be called in
an Fsd thread or from a worker Fsp thread. If called from the Fsd thread
then we acquire the resources without waiting. Otherwise we know it is
safe to wait.
We check to see whether we should post this request to the delayed close
queue. If we are to process the close here then we acquire the Vcb and
Fcb. We will adjust the counts and call our teardown routine to see
if any of the structures should go away.
Arguments:
Vcb - Vcb for this volume.
Fcb - Fcb for this request.
UserReference - Number of user references for this file object. This is
zero for an internal stream.
FromFsd - This request was called from an Fsd thread. Indicates whether
we should wait to acquire resources.
DelayedClose - Address to store whether we should try to put this on
the delayed close queue. Ignored if this routine can process this
close.
Return Value:
BOOLEAN - TRUE if this thread processed the close, FALSE otherwise.
--*/
{
BOOLEAN RemovedFcb;
PAGED_CODE();
ASSERT_IRP_CONTEXT( IrpContext );
ASSERT_FCB( Fcb );
//
// Try to acquire the Vcb and Fcb. If we can't acquire them then return
// and let our caller know he should post the request to the async
// queue.
//
if (CdAcquireVcbShared( IrpContext, Vcb, FromFsd )) {
if (!CdAcquireFcbExclusive( IrpContext, Fcb, FromFsd )) {
//
// We couldn't get the Fcb. Release the Vcb and let our caller
// know to post this request.
//
CdReleaseVcb( IrpContext, Vcb );
return FALSE;
}
//
// We didn't get the Vcb. Let our caller know to post this request.
//
} else {
return FALSE;
}
//
// Lock the Vcb and decrement the reference counts.
//
CdLockVcb( IrpContext, Vcb );
CdDecrementReferenceCounts( IrpContext, Fcb, 1, UserReference );
CdUnlockVcb( IrpContext, Vcb );
//
// Call our teardown routine to see if this object can go away.
// If we don't remove the Fcb then release it.
//
CdTeardownStructures( IrpContext, Fcb, &RemovedFcb );
if (!RemovedFcb) {
CdReleaseFcb( IrpContext, Fcb );
}
//
// Release the Vcb and return to our caller. Let him know we completed
// this request.
//
CdReleaseVcb( IrpContext, Vcb );
return TRUE;
}
VOID
CdFspClose (
IN PVCB Vcb OPTIONAL
)
/*++
Routine Description:
This routine is called to process the close queues in the CdData. If the
Vcb is passed then we want to remove all of the closes for this Vcb.
Otherwise we will do as many of the delayed closes as we need to do.
Arguments:
Vcb - If specified then we are looking for all of the closes for the
given Vcb.
Return Value:
None
--*/
{
PIRP_CONTEXT IrpContext;
IRP_CONTEXT StackIrpContext;
THREAD_CONTEXT ThreadContext;
PFCB Fcb;
ULONG UserReference;
ULONG VcbHoldCount = 0;
PVCB CurrentVcb = NULL;
BOOLEAN PotentialVcbTeardown = FALSE;
PAGED_CODE();
FsRtlEnterFileSystem();
//
// Continue processing until there are no more closes to process.
//
while (IrpContext = CdRemoveClose( Vcb )) {
//
// If we don't have an IrpContext then use the one on the stack.
// Initialize it for this request.
//
if (SafeNodeType( IrpContext ) != CDFS_NTC_IRP_CONTEXT ) {
//
// Update the local values from the IrpContextLite.
//
Fcb = ((PIRP_CONTEXT_LITE) IrpContext)->Fcb;
UserReference = ((PIRP_CONTEXT_LITE) IrpContext)->UserReference;
//
// Update the stack irp context with the values from the
// IrpContextLite.
//
CdInitializeStackIrpContext( &StackIrpContext,
(PIRP_CONTEXT_LITE) IrpContext );
//
// Free the IrpContextLite.
//
CdFreeIrpContextLite( (PIRP_CONTEXT_LITE) IrpContext );
//
// Remember we have the IrpContext from the stack.
//
IrpContext = &StackIrpContext;
//
// Otherwise cleanup the existing IrpContext.
//
} else {
//
// Remember the Fcb and user reference count.
//
Fcb = (PFCB) IrpContext->Irp;
IrpContext->Irp = NULL;
UserReference = (ULONG) IrpContext->ExceptionStatus;
IrpContext->ExceptionStatus = STATUS_SUCCESS;
}
//
// We have an IrpContext. Now we need to set the top level thread
// context.
//
SetFlag( IrpContext->Flags, IRP_CONTEXT_FSP_FLAGS );
//
// If we were given a Vcb then there is a request on top of this.
//
if (ARGUMENT_PRESENT( Vcb )) {
ClearFlag( IrpContext->Flags,
IRP_CONTEXT_FLAG_TOP_LEVEL | IRP_CONTEXT_FLAG_TOP_LEVEL_CDFS );
}
CdSetThreadContext( IrpContext, &ThreadContext );
//
// If we have hit the maximum number of requests to process without
// releasing the Vcb then release the Vcb now. If we are holding
// a different Vcb to this one then release the previous Vcb.
//
// In either case acquire the current Vcb.
//
// We use the MinDelayedCloseCount from the CdData since it is
// a convenient value based on the system size. Only thing we are trying
// to do here is prevent this routine starving other threads which
// may need this Vcb exclusively.
//
// Note that the check for potential teardown below is unsafe. We'll
// repeat later within the cddata lock.
//
PotentialVcbTeardown = !ARGUMENT_PRESENT( Vcb ) &&
(Fcb->Vcb->VcbCondition != VcbMounted) &&
(Fcb->Vcb->VcbCondition != VcbMountInProgress) &&
(Fcb->Vcb->VcbCleanup == 0);
if (PotentialVcbTeardown ||
(VcbHoldCount > CdData.MinDelayedCloseCount) ||
(Fcb->Vcb != CurrentVcb)) {
if (CurrentVcb != NULL) {
CdReleaseVcb( IrpContext, CurrentVcb );
}
if (PotentialVcbTeardown) {
CdAcquireCdData( IrpContext );
//
// Repeat the checks with global lock held. The volume could have
// been remounted while we didn't hold the lock.
//
PotentialVcbTeardown = !ARGUMENT_PRESENT( Vcb ) &&
(Fcb->Vcb->VcbCondition != VcbMounted) &&
(Fcb->Vcb->VcbCondition != VcbMountInProgress) &&
(Fcb->Vcb->VcbCleanup == 0);
if (!PotentialVcbTeardown) {
CdReleaseCdData( IrpContext);
}
}
CurrentVcb = Fcb->Vcb;
CdAcquireVcbShared( IrpContext, CurrentVcb, FALSE );
VcbHoldCount = 0;
} else {
VcbHoldCount += 1;
}
//
// Call our worker routine to perform the close operation.
//
CdCommonClosePrivate( IrpContext, CurrentVcb, Fcb, UserReference, FALSE );
//
// If the reference count on this Vcb is below our residual reference
// then check if we should dismount the volume.
//
if (PotentialVcbTeardown) {
CdReleaseVcb( IrpContext, CurrentVcb );
CdCheckForDismount( IrpContext, CurrentVcb, FALSE );
CurrentVcb = NULL;
CdReleaseCdData( IrpContext );
PotentialVcbTeardown = FALSE;
}
//
// Complete the current request to cleanup the IrpContext.
//
CdCompleteRequest( IrpContext, NULL, STATUS_SUCCESS );
}
//
// Release any Vcb we may still hold.
//
if (CurrentVcb != NULL) {
CdReleaseVcb( IrpContext, CurrentVcb );
}
FsRtlExitFileSystem();
}
NTSTATUS
CdCommonQueryVolInfo (
IN PIRP_CONTEXT IrpContext,
IN PIRP Irp
)
/*++
Routine Description:
This is the common routine for querying volume information called by both
the fsd and fsp threads.
Arguments:
Irp - Supplies the Irp being processed
Return Value:
NTSTATUS - The return status for the operation
--*/
{
NTSTATUS Status = STATUS_INVALID_PARAMETER;
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation( Irp );
ULONG Length;
TYPE_OF_OPEN TypeOfOpen;
PFCB Fcb;
PCCB Ccb;
PAGED_CODE();
//
// Reference our input parameters to make things easier
//
Length = IrpSp->Parameters.QueryVolume.Length;
//
// Decode the file object and fail if this an unopened file object.
//
TypeOfOpen = CdDecodeFileObject( IrpContext, IrpSp->FileObject, &Fcb, &Ccb );
if (TypeOfOpen == UnopenedFileObject) {
CdCompleteRequest( IrpContext, Irp, STATUS_INVALID_PARAMETER );
return STATUS_INVALID_PARAMETER;
}
//
// Acquire the Vcb for this volume.
//
CdAcquireVcbShared( IrpContext, Fcb->Vcb, FALSE );
//
// Use a try-finally to facilitate cleanup.
//
try {
//
// Verify the Vcb.
//
CdVerifyVcb( IrpContext, Fcb->Vcb );
//
// Based on the information class we'll do different actions. Each
// of the procedures that we're calling fills up the output buffer
// if possible and returns true if it successfully filled the buffer
// and false if it couldn't wait for any I/O to complete.
//
switch (IrpSp->Parameters.QueryVolume.FsInformationClass) {
case FileFsSizeInformation:
Status = CdQueryFsSizeInfo( IrpContext, Fcb->Vcb, Irp->AssociatedIrp.SystemBuffer, &Length );
break;
case FileFsVolumeInformation:
Status = CdQueryFsVolumeInfo( IrpContext, Fcb->Vcb, Irp->AssociatedIrp.SystemBuffer, &Length );
break;
case FileFsDeviceInformation:
Status = CdQueryFsDeviceInfo( IrpContext, Fcb->Vcb, Irp->AssociatedIrp.SystemBuffer, &Length );
break;
case FileFsAttributeInformation:
Status = CdQueryFsAttributeInfo( IrpContext, Fcb->Vcb, Irp->AssociatedIrp.SystemBuffer, &Length );
break;
}
//
// Set the information field to the number of bytes actually filled in
//
Irp->IoStatus.Information = IrpSp->Parameters.QueryVolume.Length - Length;
} finally {
//
// Release the Vcb.
//
CdReleaseVcb( IrpContext, Fcb->Vcb );
}
//
// Complete the request if we didn't raise.
//
CdCompleteRequest( IrpContext, Irp, Status );
return Status;
}
