You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
470 lines
11 KiB
470 lines
11 KiB
/*++
|
|
|
|
Copyright (c) 1989-2000 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
FspDisp.c
|
|
|
|
Abstract:
|
|
|
|
This module implements the main dispatch procedure/thread for the Fat
|
|
Fsp
|
|
|
|
// @@BEGIN_DDKSPLIT
|
|
|
|
Author:
|
|
|
|
Gary Kimura [GaryKi] 28-Dec-1989
|
|
|
|
Revision History:
|
|
|
|
// @@END_DDKSPLIT
|
|
|
|
--*/
|
|
|
|
#include "FatProcs.h"
|
|
|
|
//
|
|
// Internal support routine, spinlock wrapper.
|
|
//
|
|
|
|
PVOID
|
|
FatRemoveOverflowEntry (
|
|
IN PVOLUME_DEVICE_OBJECT VolDo
|
|
);
|
|
|
|
//
|
|
// Define our local debug trace level
|
|
//
|
|
|
|
#define Dbg (DEBUG_TRACE_FSP_DISPATCHER)
|
|
|
|
#ifdef ALLOC_PRAGMA
|
|
#pragma alloc_text(PAGE, FatFspDispatch)
|
|
#endif
|
|
|
|
|
|
VOID
|
|
FatFspDispatch (
|
|
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
|
|
|
|
--*/
|
|
|
|
{
|
|
NTSTATUS Status;
|
|
|
|
PIRP Irp;
|
|
PIRP_CONTEXT IrpContext;
|
|
PIO_STACK_LOCATION IrpSp;
|
|
|
|
PVOLUME_DEVICE_OBJECT VolDo;
|
|
|
|
IrpContext = (PIRP_CONTEXT)Context;
|
|
|
|
Irp = IrpContext->OriginatingIrp;
|
|
|
|
IrpSp = IoGetCurrentIrpStackLocation( Irp );
|
|
|
|
//
|
|
// Now because we are the Fsp we will force the IrpContext to
|
|
// indicate true on Wait.
|
|
//
|
|
|
|
SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT | IRP_CONTEXT_FLAG_IN_FSP);
|
|
|
|
//
|
|
// If this request has an associated volume device object, remember it.
|
|
//
|
|
|
|
if ( 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 FatReadSectorsSync has trouble).
|
|
//
|
|
|
|
while ( TRUE ) {
|
|
|
|
DebugTrace(0, Dbg, "FatFspDispatch: Irp = 0x%08lx\n", Irp);
|
|
|
|
//
|
|
// If this Irp was top level, note it in our thread local storage.
|
|
//
|
|
|
|
FsRtlEnterFileSystem();
|
|
|
|
if ( FlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_RECURSIVE_CALL) ) {
|
|
|
|
IoSetTopLevelIrp( (PIRP)FSRTL_FSP_TOP_LEVEL_IRP );
|
|
|
|
} else {
|
|
|
|
IoSetTopLevelIrp( Irp );
|
|
}
|
|
|
|
try {
|
|
|
|
switch ( IrpContext->MajorFunction ) {
|
|
|
|
//
|
|
// For Create Operation,
|
|
//
|
|
|
|
case IRP_MJ_CREATE:
|
|
|
|
(VOID) FatCommonCreate( IrpContext, Irp );
|
|
break;
|
|
|
|
//
|
|
// For close operations. We do a little kludge here in case
|
|
// this close causes a volume to go away. It will NULL the
|
|
// VolDo local variable so that we will not try to look at
|
|
// the overflow queue.
|
|
//
|
|
|
|
case IRP_MJ_CLOSE:
|
|
|
|
{
|
|
PVCB Vcb;
|
|
PFCB Fcb;
|
|
PCCB Ccb;
|
|
TYPE_OF_OPEN TypeOfOpen;
|
|
BOOLEAN VolumeTornDown = FALSE;
|
|
|
|
//
|
|
// Extract and decode the file object
|
|
//
|
|
|
|
TypeOfOpen = FatDecodeFileObject( IrpSp->FileObject, &Vcb, &Fcb, &Ccb );
|
|
|
|
//
|
|
// Do the close. We have a slightly different format
|
|
// for this call because of the async closes.
|
|
//
|
|
|
|
Status = FatCommonClose( Vcb, Fcb, Ccb, TypeOfOpen, TRUE, &VolumeTornDown);
|
|
|
|
ASSERT(Status == STATUS_SUCCESS);
|
|
|
|
if (VolumeTornDown) {
|
|
|
|
VolDo = NULL;
|
|
}
|
|
|
|
FatCompleteRequest( IrpContext, Irp, Status );
|
|
|
|
break;
|
|
}
|
|
|
|
//
|
|
// For read operations
|
|
//
|
|
|
|
case IRP_MJ_READ:
|
|
|
|
(VOID) FatCommonRead( IrpContext, Irp );
|
|
break;
|
|
|
|
//
|
|
// For write operations,
|
|
//
|
|
|
|
case IRP_MJ_WRITE:
|
|
|
|
(VOID) FatCommonWrite( IrpContext, Irp );
|
|
break;
|
|
|
|
//
|
|
// For Query Information operations,
|
|
//
|
|
|
|
case IRP_MJ_QUERY_INFORMATION:
|
|
|
|
(VOID) FatCommonQueryInformation( IrpContext, Irp );
|
|
break;
|
|
|
|
//
|
|
// For Set Information operations,
|
|
//
|
|
|
|
case IRP_MJ_SET_INFORMATION:
|
|
|
|
(VOID) FatCommonSetInformation( IrpContext, Irp );
|
|
break;
|
|
|
|
//
|
|
// For Query EA operations,
|
|
//
|
|
|
|
case IRP_MJ_QUERY_EA:
|
|
|
|
(VOID) FatCommonQueryEa( IrpContext, Irp );
|
|
break;
|
|
|
|
//
|
|
// For Set EA operations,
|
|
//
|
|
|
|
case IRP_MJ_SET_EA:
|
|
|
|
(VOID) FatCommonSetEa( IrpContext, Irp );
|
|
break;
|
|
|
|
//
|
|
// For Flush buffers operations,
|
|
//
|
|
|
|
case IRP_MJ_FLUSH_BUFFERS:
|
|
|
|
(VOID) FatCommonFlushBuffers( IrpContext, Irp );
|
|
break;
|
|
|
|
//
|
|
// For Query Volume Information operations,
|
|
//
|
|
|
|
case IRP_MJ_QUERY_VOLUME_INFORMATION:
|
|
|
|
(VOID) FatCommonQueryVolumeInfo( IrpContext, Irp );
|
|
break;
|
|
|
|
//
|
|
// For Set Volume Information operations,
|
|
//
|
|
|
|
case IRP_MJ_SET_VOLUME_INFORMATION:
|
|
|
|
(VOID) FatCommonSetVolumeInfo( IrpContext, Irp );
|
|
break;
|
|
|
|
//
|
|
// For File Cleanup operations,
|
|
//
|
|
|
|
case IRP_MJ_CLEANUP:
|
|
|
|
(VOID) FatCommonCleanup( IrpContext, Irp );
|
|
break;
|
|
|
|
//
|
|
// For Directory Control operations,
|
|
//
|
|
|
|
case IRP_MJ_DIRECTORY_CONTROL:
|
|
|
|
(VOID) FatCommonDirectoryControl( IrpContext, Irp );
|
|
break;
|
|
|
|
//
|
|
// For File System Control operations,
|
|
//
|
|
|
|
case IRP_MJ_FILE_SYSTEM_CONTROL:
|
|
|
|
(VOID) FatCommonFileSystemControl( IrpContext, Irp );
|
|
break;
|
|
|
|
//
|
|
// For Lock Control operations,
|
|
//
|
|
|
|
case IRP_MJ_LOCK_CONTROL:
|
|
|
|
(VOID) FatCommonLockControl( IrpContext, Irp );
|
|
break;
|
|
|
|
//
|
|
// For Device Control operations,
|
|
//
|
|
|
|
case IRP_MJ_DEVICE_CONTROL:
|
|
|
|
(VOID) FatCommonDeviceControl( IrpContext, Irp );
|
|
break;
|
|
|
|
//
|
|
// For the Shutdown operation,
|
|
//
|
|
|
|
case IRP_MJ_SHUTDOWN:
|
|
|
|
(VOID) FatCommonShutdown( IrpContext, Irp );
|
|
break;
|
|
|
|
//
|
|
// For plug and play operations.
|
|
//
|
|
|
|
case IRP_MJ_PNP:
|
|
|
|
//
|
|
// I don't believe this should ever occur, but allow for the unexpected.
|
|
//
|
|
|
|
(VOID) FatCommonPnp( IrpContext, Irp );
|
|
break;
|
|
|
|
//
|
|
// For any other major operations, return an invalid
|
|
// request.
|
|
//
|
|
|
|
default:
|
|
|
|
FatCompleteRequest( IrpContext, Irp, STATUS_INVALID_DEVICE_REQUEST );
|
|
break;
|
|
|
|
}
|
|
|
|
} except(FatExceptionFilter( 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.
|
|
//
|
|
|
|
(VOID) FatProcessException( IrpContext, Irp, GetExceptionCode() );
|
|
}
|
|
|
|
IoSetTopLevelIrp( NULL );
|
|
|
|
FsRtlExitFileSystem();
|
|
|
|
//
|
|
// If there are any entries on this volume's overflow queue, service
|
|
// them.
|
|
//
|
|
|
|
if ( VolDo != NULL ) {
|
|
|
|
PVOID Entry;
|
|
|
|
//
|
|
// We have a volume device object so see if there is any work
|
|
// left to do in its overflow queue.
|
|
//
|
|
|
|
Entry = FatRemoveOverflowEntry( VolDo );
|
|
|
|
//
|
|
// There wasn't an entry, break out of the loop and return to
|
|
// the Ex Worker thread.
|
|
//
|
|
|
|
if ( Entry == NULL ) {
|
|
|
|
break;
|
|
}
|
|
|
|
//
|
|
// Extract the IrpContext, Irp, and IrpSp, and loop.
|
|
//
|
|
|
|
IrpContext = CONTAINING_RECORD( Entry,
|
|
IRP_CONTEXT,
|
|
WorkQueueItem.List );
|
|
|
|
SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT | IRP_CONTEXT_FLAG_IN_FSP);
|
|
|
|
Irp = IrpContext->OriginatingIrp;
|
|
|
|
IrpSp = IoGetCurrentIrpStackLocation( Irp );
|
|
|
|
continue;
|
|
|
|
} else {
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Decrement the PostedRequestCount.
|
|
//
|
|
|
|
if ( VolDo ) {
|
|
|
|
ExInterlockedAddUlong( &VolDo->PostedRequestCount,
|
|
0xffffffff,
|
|
&VolDo->OverflowQueueSpinLock );
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
//
|
|
// Internal support routine, spinlock wrapper.
|
|
//
|
|
|
|
PVOID
|
|
FatRemoveOverflowEntry (
|
|
IN PVOLUME_DEVICE_OBJECT VolDo
|
|
)
|
|
{
|
|
PVOID Entry;
|
|
KIRQL SavedIrql;
|
|
|
|
KeAcquireSpinLock( &VolDo->OverflowQueueSpinLock, &SavedIrql );
|
|
|
|
if (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
|
|
//
|
|
|
|
VolDo->OverflowQueueCount -= 1;
|
|
|
|
Entry = RemoveHeadList( &VolDo->OverflowQueue );
|
|
|
|
} else {
|
|
|
|
Entry = NULL;
|
|
}
|
|
|
|
KeReleaseSpinLock( &VolDo->OverflowQueueSpinLock, SavedIrql );
|
|
|
|
return Entry;
|
|
}
|
|
|