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286 lines
7.0 KiB
286 lines
7.0 KiB
/*++
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Copyright (c) 1989-2000 Microsoft Corporation
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Module Name:
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FspDisp.c
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Abstract:
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This module implements the main dispatch procedure/thread for the Cdfs
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Fsp
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// @@BEGIN_DDKSPLIT
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Author:
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Brian Andrew [BrianAn] 02-Jan-1991
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Revision History:
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// @@END_DDKSPLIT
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--*/
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#include "CdProcs.h"
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//
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// The Bug check file id for this module
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//
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#define BugCheckFileId (CDFS_BUG_CHECK_FSPDISP)
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VOID
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CdFspDispatch (
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IN PIRP_CONTEXT IrpContext
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)
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/*++
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Routine Description:
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This is the main FSP thread routine that is executed to receive
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and dispatch IRP requests. Each FSP thread begins its execution here.
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There is one thread created at system initialization time and subsequent
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threads created as needed.
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Arguments:
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IrpContext - IrpContext for a request to process.
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Return Value:
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None
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--*/
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{
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THREAD_CONTEXT ThreadContext;
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NTSTATUS Status;
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PIRP Irp = IrpContext->Irp;
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PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation( Irp );
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PVOLUME_DEVICE_OBJECT VolDo = NULL;
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//
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// If this request has an associated volume device object, remember it.
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//
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if (IrpSp->FileObject != NULL) {
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VolDo = CONTAINING_RECORD( IrpSp->DeviceObject,
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VOLUME_DEVICE_OBJECT,
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DeviceObject );
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}
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//
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// Now case on the function code. For each major function code,
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// either call the appropriate worker routine. This routine that
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// we call is responsible for completing the IRP, and not us.
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// That way the routine can complete the IRP and then continue
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// post processing as required. For example, a read can be
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// satisfied right away and then read can be done.
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//
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// We'll do all of the work within an exception handler that
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// will be invoked if ever some underlying operation gets into
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// trouble.
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//
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while ( TRUE ) {
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//
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// Set all the flags indicating we are in the Fsp.
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//
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SetFlag( IrpContext->Flags, IRP_CONTEXT_FSP_FLAGS );
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FsRtlEnterFileSystem();
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CdSetThreadContext( IrpContext, &ThreadContext );
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while (TRUE) {
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try {
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//
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// Reinitialize for the next try at completing this
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// request.
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//
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Status =
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IrpContext->ExceptionStatus = STATUS_SUCCESS;
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//
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// Initialize the Io status field in the Irp.
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//
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Irp->IoStatus.Status = STATUS_SUCCESS;
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Irp->IoStatus.Information = 0;
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//
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// Case on the major irp code.
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//
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switch (IrpContext->MajorFunction) {
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case IRP_MJ_CREATE :
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CdCommonCreate( IrpContext, Irp );
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break;
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case IRP_MJ_CLOSE :
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ASSERT( FALSE );
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break;
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case IRP_MJ_READ :
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CdCommonRead( IrpContext, Irp );
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break;
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case IRP_MJ_QUERY_INFORMATION :
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CdCommonQueryInfo( IrpContext, Irp );
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break;
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case IRP_MJ_SET_INFORMATION :
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CdCommonSetInfo( IrpContext, Irp );
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break;
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case IRP_MJ_QUERY_VOLUME_INFORMATION :
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CdCommonQueryVolInfo( IrpContext, Irp );
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break;
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case IRP_MJ_DIRECTORY_CONTROL :
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CdCommonDirControl( IrpContext, Irp );
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break;
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case IRP_MJ_FILE_SYSTEM_CONTROL :
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CdCommonFsControl( IrpContext, Irp );
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break;
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case IRP_MJ_DEVICE_CONTROL :
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CdCommonDevControl( IrpContext, Irp );
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break;
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case IRP_MJ_LOCK_CONTROL :
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CdCommonLockControl( IrpContext, Irp );
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break;
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case IRP_MJ_CLEANUP :
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CdCommonCleanup( IrpContext, Irp );
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break;
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case IRP_MJ_PNP :
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ASSERT( FALSE );
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CdCommonPnp( IrpContext, Irp );
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break;
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default :
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Status = STATUS_INVALID_DEVICE_REQUEST;
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CdCompleteRequest( IrpContext, Irp, Status );
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}
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} except( CdExceptionFilter( IrpContext, GetExceptionInformation() )) {
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Status = CdProcessException( IrpContext, Irp, GetExceptionCode() );
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}
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//
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// Break out of the loop if we didn't get CANT_WAIT.
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//
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if (Status != STATUS_CANT_WAIT) { break; }
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//
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// We are retrying this request. Cleanup the IrpContext for the retry.
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//
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SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_MORE_PROCESSING );
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CdCleanupIrpContext( IrpContext, FALSE );
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}
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FsRtlExitFileSystem();
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//
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// If there are any entries on this volume's overflow queue, service
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// them.
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//
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if (VolDo != NULL) {
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KIRQL SavedIrql;
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PVOID Entry = NULL;
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//
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// We have a volume device object so see if there is any work
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// left to do in its overflow queue.
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//
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KeAcquireSpinLock( &VolDo->OverflowQueueSpinLock, &SavedIrql );
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if (VolDo->OverflowQueueCount > 0) {
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//
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// There is overflow work to do in this volume so we'll
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// decrement the Overflow count, dequeue the IRP, and release
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// the Event
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//
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VolDo->OverflowQueueCount -= 1;
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Entry = RemoveHeadList( &VolDo->OverflowQueue );
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}
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KeReleaseSpinLock( &VolDo->OverflowQueueSpinLock, SavedIrql );
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//
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// There wasn't an entry, break out of the loop and return to
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// the Ex Worker thread.
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//
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if (Entry == NULL) { break; }
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//
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// Extract the IrpContext , Irp, set wait to TRUE, and loop.
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//
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IrpContext = CONTAINING_RECORD( Entry,
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IRP_CONTEXT,
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WorkQueueItem.List );
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Irp = IrpContext->Irp;
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IrpSp = IoGetCurrentIrpStackLocation( Irp );
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continue;
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}
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break;
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}
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//
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// Decrement the PostedRequestCount if there was a volume device object.
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//
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if (VolDo) {
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InterlockedDecrement( &VolDo->PostedRequestCount );
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}
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return;
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}
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