VOID
NtfsFspDispatch (
IN PVOID Context
)
/*++
Routine Description:
This is the main FSP thread routine that is executed to receive
and dispatch IRP requests. Each FSP thread begins its execution here.
There is one thread created at system initialization time and subsequent
threads created as needed.
Arguments:
Context - Supplies the thread id.
Return Value:
None - This routine never exits
--*/
{
TOP_LEVEL_CONTEXT TopLevelContext;
PTOP_LEVEL_CONTEXT ThreadTopLevelContext;
OPLOCK_CLEANUP OplockCleanup;
PIRP Irp;
PIRP_CONTEXT IrpContext;
PIO_STACK_LOCATION IrpSp;
ULONG LogFileFullCount = 0;
PVOLUME_DEVICE_OBJECT VolDo;
BOOLEAN Retry;
NTSTATUS Status = STATUS_SUCCESS;
IrpContext = (PIRP_CONTEXT)Context;
Irp = IrpContext->OriginatingIrp;
if (Irp != NULL) {
IrpSp = IoGetCurrentIrpStackLocation( Irp );
}
//
// Now because we are the Fsp we will force the IrpContext to
// indicate true on Wait.
//
SetFlag( IrpContext->State, IRP_CONTEXT_STATE_WAIT );
//
// If this request has an associated volume device object, remember it.
//
if ((Irp != NULL) &&
(IrpSp->FileObject != NULL)) {
VolDo = CONTAINING_RECORD( IrpSp->DeviceObject,
VOLUME_DEVICE_OBJECT,
DeviceObject );
} else {
VolDo = NULL;
}
//
// Now case on the function code. For each major function code,
// either call the appropriate FSP routine or case on the minor
// function and then call the FSP routine. The FSP routine that
// we call is responsible for completing the IRP, and not us.
// That way the routine can complete the IRP and then continue
// post processing as required. For example, a read can be
// satisfied right away and then read can be done.
//
// We'll do all of the work within an exception handler that
// will be invoked if ever some underlying operation gets into
// trouble (e.g., if NtfsReadSectorsSync has trouble).
//
while (TRUE) {
FsRtlEnterFileSystem();
ASSERT( IoGetTopLevelIrp() != (PIRP) &TopLevelContext );
ThreadTopLevelContext = NtfsInitializeTopLevelIrp( &TopLevelContext, TRUE, TRUE );
ASSERT( ThreadTopLevelContext == &TopLevelContext );
NtfsPostRequests += 1;
do {
//
// If this is the initial try with this Irp Context, update the
// top level Irp fields.
//
NtfsUpdateIrpContextWithTopLevel( IrpContext, ThreadTopLevelContext );
Retry = FALSE;
try {
//
// Always clear the exception code in the IrpContext so we respond
// correctly to errors encountered in the Fsp.
//
IrpContext->ExceptionStatus = 0;
SetFlag( IrpContext->State, IRP_CONTEXT_STATE_IN_FSP );
//
// See if we were posted due to a log file full condition, and
// if so, then do a clean volume checkpoint if we are the
// first ones to get there. If we see a different Lsn and do
// not do the checkpoint, the worst that can happen is that we
// will get posted again if the log file is still full.
//
if (IrpContext->LastRestartArea.QuadPart != 0) {
NtfsCheckpointForLogFileFull( IrpContext );
if (++LogFileFullCount >= 2) {
SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_EXCESS_LOG_FULL );
}
}
//
// If we have an Irp then proceed with our normal processing.
//
if (Irp != NULL) {
switch ( IrpContext->MajorFunction ) {
//
// For Create Operation,
//
case IRP_MJ_CREATE:
ClearFlag( IrpContext->State, IRP_CONTEXT_STATE_EFS_CREATE );
if (FlagOn( IrpContext->State, IRP_CONTEXT_STATE_DASD_OPEN )) {
Status = NtfsCommonVolumeOpen( IrpContext, Irp );
} else {
RtlZeroMemory( &OplockCleanup, sizeof( OplockCleanup ) );
Status = NtfsCommonCreate( IrpContext, Irp, &OplockCleanup, NULL );
}
break;
//
// For close operations
//
case IRP_MJ_CLOSE:
//
// We should never post closes to this workqueue.
//
NtfsBugCheck( 0, 0, 0 );
break;
//
// For read operations
//
case IRP_MJ_READ:
(VOID) NtfsCommonRead( IrpContext, Irp, TRUE );
break;
//
// For write operations,
//
case IRP_MJ_WRITE:
(VOID) NtfsCommonWrite( IrpContext, Irp );
break;
//
// For Query Information operations,
//
case IRP_MJ_QUERY_INFORMATION:
(VOID) NtfsCommonQueryInformation( IrpContext, Irp );
break;
//
// For Set Information operations,
//
case IRP_MJ_SET_INFORMATION:
(VOID) NtfsCommonSetInformation( IrpContext, Irp );
break;
//
// For Query EA operations,
//
case IRP_MJ_QUERY_EA:
(VOID) NtfsCommonQueryEa( IrpContext, Irp );
break;
//
// For Set EA operations,
//
case IRP_MJ_SET_EA:
(VOID) NtfsCommonSetEa( IrpContext, Irp );
break;
//
// For Flush buffers operations,
//
case IRP_MJ_FLUSH_BUFFERS:
(VOID) NtfsCommonFlushBuffers( IrpContext, Irp );
break;
//
// For Query Volume Information operations,
//
case IRP_MJ_QUERY_VOLUME_INFORMATION:
(VOID) NtfsCommonQueryVolumeInfo( IrpContext, Irp );
break;
//
// For Set Volume Information operations,
//
case IRP_MJ_SET_VOLUME_INFORMATION:
(VOID) NtfsCommonSetVolumeInfo( IrpContext, Irp );
break;
//
// For File Cleanup operations,
//
case IRP_MJ_CLEANUP:
(VOID) NtfsCommonCleanup( IrpContext, Irp );
break;
//
// For Directory Control operations,
//
case IRP_MJ_DIRECTORY_CONTROL:
(VOID) NtfsCommonDirectoryControl( IrpContext, Irp );
break;
//
// For File System Control operations,
//
case IRP_MJ_FILE_SYSTEM_CONTROL:
(VOID) NtfsCommonFileSystemControl( IrpContext, Irp );
break;
//
// For Lock Control operations,
//
case IRP_MJ_LOCK_CONTROL:
(VOID) NtfsCommonLockControl( IrpContext, Irp );
break;
//
// For Device Control operations,
//
case IRP_MJ_DEVICE_CONTROL:
(VOID) NtfsCommonDeviceControl( IrpContext, Irp );
break;
//
// For Query Security Information operations,
//
case IRP_MJ_QUERY_SECURITY:
(VOID) NtfsCommonQuerySecurityInfo( IrpContext, Irp );
break;
//
// For Set Security Information operations,
//
case IRP_MJ_SET_SECURITY:
(VOID) NtfsCommonSetSecurityInfo( IrpContext, Irp );
break;
//
// For Query Quota operations,
//
case IRP_MJ_QUERY_QUOTA:
(VOID) NtfsCommonQueryQuota( IrpContext, Irp );
break;
//
// For Set Quota operations,
//
case IRP_MJ_SET_QUOTA:
(VOID) NtfsCommonSetQuota( IrpContext, Irp );
break;
//
// For any other major operations, return an invalid
// request.
//
default:
NtfsCompleteRequest( IrpContext, Irp, STATUS_INVALID_DEVICE_REQUEST );
break;
}
//
// Otherwise complete the request to clean up this Irp Context.
//
} else {
NtfsCompleteRequest( IrpContext, NULL, STATUS_SUCCESS );
IrpContext = NULL;
}
ASSERT( IoGetTopLevelIrp() != (PIRP) &TopLevelContext );
} except(NtfsExceptionFilter( IrpContext, GetExceptionInformation() )) {
PIO_STACK_LOCATION IrpSp;
//
// We had some trouble trying to perform the requested
// operation, so we'll abort the I/O request with
// the error status that we get back from the
// execption code
//
if (Irp != NULL) {
IrpSp = IoGetCurrentIrpStackLocation( Irp );
Status = GetExceptionCode();
if ((Status == STATUS_FILE_DELETED) &&
((IrpContext->MajorFunction == IRP_MJ_READ) ||
(IrpContext->MajorFunction == IRP_MJ_WRITE) ||
((IrpContext->MajorFunction == IRP_MJ_SET_INFORMATION) &&
(IrpSp->Parameters.SetFile.FileInformationClass == FileEndOfFileInformation)))) {
IrpContext->ExceptionStatus = Status = STATUS_SUCCESS;
}
}
//
// If we failed to upgrade the volume's version during mount, we may
// not have put the right exception code into the irp context yet.
//
if ((IrpContext != NULL) &&
(FlagOn( IrpContext->State, IRP_CONTEXT_STATE_VOL_UPGR_FAILED )) &&
(IrpContext->MajorFunction == IRP_MJ_FILE_SYSTEM_CONTROL) &&
(IrpContext->MinorFunction == IRP_MN_MOUNT_VOLUME)) {
IrpContext->ExceptionStatus = Status;
}
//
// This is the return status code that we want the Irp Completion routine to receive.
//
Status = NtfsProcessException( IrpContext, Irp, Status );
if ((Status == STATUS_CANT_WAIT) || (Status == STATUS_LOG_FILE_FULL)) {
Retry = TRUE;
}
}
} while (Retry);
FsRtlExitFileSystem();
//
// If there are any entries on this volume's overflow queue, service
// them.
//
if (VolDo != NULL) {
KIRQL SavedIrql;
PLIST_ENTRY Entry = NULL;
//
// We have a volume device object so see if there is any work
// left to do in its overflow queue.
//
KeAcquireSpinLock( &VolDo->OverflowQueueSpinLock, &SavedIrql );
while (VolDo->OverflowQueueCount > 0) {
//
// There is overflow work to do in this volume so we'll
// decrement the Overflow count, dequeue the IRP, and release
// the Event
//
Entry = VolDo->OverflowQueue.Flink;
IrpContext = CONTAINING_RECORD( Entry,
IRP_CONTEXT,
WorkQueueItem.List );
Irp = IrpContext->OriginatingIrp;
//
// If the cancel routine thinks it owns the irp ignore it
//
if (NtfsSetCancelRoutine( Irp, NULL, 0, FALSE )) {
VolDo->OverflowQueueCount -= 1;
RemoveEntryList( (PLIST_ENTRY)Entry );
break;
} else {
//
// Release the spinlock to let the cancel routine gain it and finish
// its action
//
KeReleaseSpinLock( &VolDo->OverflowQueueSpinLock, SavedIrql );
KeAcquireSpinLock( &VolDo->OverflowQueueSpinLock, &SavedIrql );
Entry = NULL;
}
} // endwhile
KeReleaseSpinLock( &VolDo->OverflowQueueSpinLock, SavedIrql );
//
// There wasn't an entry, break out of the loop and return to
// the Ex Worker thread.
//
if ( Entry == NULL ) {
break;
}
if (VolDo->OverflowQueueCount < OVERFLOW_QUEUE_LIMIT) {
KeSetEvent( &VolDo->OverflowQueueEvent, IO_NO_INCREMENT, FALSE );
}
//
// set wait to TRUE, and loop.
//
LogFileFullCount = 0;
SetFlag( IrpContext->State, IRP_CONTEXT_STATE_WAIT );
continue;
} else {
break;
}
}
//
// Decrement the PostedRequestCount.
//
if (VolDo) {
ExInterlockedAddUlong( &VolDo->PostedRequestCount,
0xffffffff,
&VolDo->OverflowQueueSpinLock );
}
return;
}
NTSTATUS
NtfsFsdQuerySecurityInfo (
IN PVOLUME_DEVICE_OBJECT VolumeDeviceObject,
IN PIRP Irp
)
/*++
Routine Description:
This routine implements the FSD part of the Query Security Information API
calls.
Arguments:
VolumeDeviceObject - Supplies the device object to use.
Irp - Supplies the Irp being processed
Return Value:
NTSTATUS - The Fsd status for the Irp
--*/
{
TOP_LEVEL_CONTEXT TopLevelContext;
PTOP_LEVEL_CONTEXT ThreadTopLevelContext;
NTSTATUS Status = STATUS_SUCCESS;
PIRP_CONTEXT IrpContext = NULL;
ASSERT_IRP( Irp );
UNREFERENCED_PARAMETER( VolumeDeviceObject );
PAGED_CODE();
DebugTrace( +1, Dbg, ("NtfsFsdQuerySecurityInfo\n") );
//
// Call the common query Information routine
//
FsRtlEnterFileSystem();
ThreadTopLevelContext = NtfsSetTopLevelIrp( &TopLevelContext, FALSE, FALSE );
do {
try {
//
// We are either initiating this request or retrying it.
//
if (IrpContext == NULL) {
IrpContext = NtfsCreateIrpContext( Irp, CanFsdWait( Irp ) );
NtfsUpdateIrpContextWithTopLevel( IrpContext, ThreadTopLevelContext );
} else if (Status == STATUS_LOG_FILE_FULL) {
NtfsCheckpointForLogFileFull( IrpContext );
}
Status = NtfsCommonQuerySecurityInfo( IrpContext, Irp );
break;
} except(NtfsExceptionFilter( IrpContext, GetExceptionInformation() )) {
//
// We had some trouble trying to perform the requested
// operation, so we'll abort the I/O request with
// the error status that we get back from the
// execption code
//
Status = NtfsProcessException( IrpContext, Irp, GetExceptionCode() );
}
} while (Status == STATUS_CANT_WAIT ||
Status == STATUS_LOG_FILE_FULL);
if (ThreadTopLevelContext == &TopLevelContext) {
NtfsRestoreTopLevelIrp( ThreadTopLevelContext );
}
FsRtlExitFileSystem();
//
// And return to our caller
//
DebugTrace( -1, Dbg, ("NtfsFsdQuerySecurityInfo -> %08lx\n", Status) );
return Status;
}