851 lines
24 KiB
C
851 lines
24 KiB
C
/*++
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Copyright (c) 1991 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 Ntfs
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Fsp
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Author:
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Gary Kimura [GaryKi] 21-May-1991
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Revision History:
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--*/
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#include "NtfsProc.h"
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#define BugCheckFileId (NTFS_BUG_CHECK_FSPDISP)
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#pragma alloc_text(PAGE, NtfsSpecialDispatch)
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#pragma alloc_text(PAGE, NtfsPostSpecial)
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//
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// Define our local debug trace level
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//
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#define Dbg (DEBUG_TRACE_FSP_DISPATCHER)
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extern PETHREAD NtfsDesignatedTimeoutThread;
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VOID
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NtfsFspDispatch (
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IN PVOID Context
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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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Context - Supplies the thread id.
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Return Value:
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None - This routine never exits
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--*/
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{
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TOP_LEVEL_CONTEXT TopLevelContext;
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PTOP_LEVEL_CONTEXT ThreadTopLevelContext;
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OPLOCK_CLEANUP OplockCleanup;
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PIRP Irp;
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PIRP_CONTEXT IrpContext;
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PIO_STACK_LOCATION IrpSp;
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ULONG LogFileFullCount = 0;
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PVOLUME_DEVICE_OBJECT VolDo;
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BOOLEAN Retry;
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NTSTATUS Status = STATUS_SUCCESS;
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IrpContext = (PIRP_CONTEXT)Context;
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Irp = IrpContext->OriginatingIrp;
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if (Irp != NULL) {
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IrpSp = IoGetCurrentIrpStackLocation( Irp );
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}
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//
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// Now because we are the Fsp we will force the IrpContext to
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// indicate true on Wait.
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//
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SetFlag( IrpContext->State, IRP_CONTEXT_STATE_WAIT );
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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 ((Irp != NULL) &&
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(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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} else {
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VolDo = NULL;
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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 FSP routine or case on the minor
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// function and then call the FSP routine. The FSP 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 (e.g., if NtfsReadSectorsSync has trouble).
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//
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while (TRUE) {
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FsRtlEnterFileSystem();
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ASSERT( IoGetTopLevelIrp() != (PIRP) &TopLevelContext );
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ThreadTopLevelContext = NtfsInitializeTopLevelIrp( &TopLevelContext, TRUE, TRUE );
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ASSERT( ThreadTopLevelContext == &TopLevelContext );
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NtfsPostRequests += 1;
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do {
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//
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// If this is the initial try with this Irp Context, update the
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// top level Irp fields.
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//
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NtfsUpdateIrpContextWithTopLevel( IrpContext, ThreadTopLevelContext );
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Retry = FALSE;
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try {
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//
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// Always clear the exception code in the IrpContext so we respond
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// correctly to errors encountered in the Fsp.
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//
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IrpContext->ExceptionStatus = 0;
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SetFlag( IrpContext->State, IRP_CONTEXT_STATE_IN_FSP );
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//
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// See if we were posted due to a log file full condition, and
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// if so, then do a clean volume checkpoint if we are the
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// first ones to get there. If we see a different Lsn and do
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// not do the checkpoint, the worst that can happen is that we
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// will get posted again if the log file is still full.
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//
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if (IrpContext->LastRestartArea.QuadPart != 0) {
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NtfsCheckpointForLogFileFull( IrpContext );
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if (++LogFileFullCount >= 2) {
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SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_EXCESS_LOG_FULL );
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}
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}
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//
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// If we have an Irp then proceed with our normal processing.
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//
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if (Irp != NULL) {
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switch ( IrpContext->MajorFunction ) {
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//
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// For Create Operation,
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//
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case IRP_MJ_CREATE:
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ClearFlag( IrpContext->State, IRP_CONTEXT_STATE_EFS_CREATE );
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if (FlagOn( IrpContext->State, IRP_CONTEXT_STATE_DASD_OPEN )) {
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Status = NtfsCommonVolumeOpen( IrpContext, Irp );
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} else {
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RtlZeroMemory( &OplockCleanup, sizeof( OplockCleanup ) );
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Status = NtfsCommonCreate( IrpContext, Irp, &OplockCleanup, NULL );
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}
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break;
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//
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// For close operations
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//
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case IRP_MJ_CLOSE:
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//
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// We should never post closes to this workqueue.
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//
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NtfsBugCheck( 0, 0, 0 );
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break;
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//
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// For read operations
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//
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case IRP_MJ_READ:
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(VOID) NtfsCommonRead( IrpContext, Irp, TRUE );
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break;
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//
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// For write operations,
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//
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case IRP_MJ_WRITE:
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(VOID) NtfsCommonWrite( IrpContext, Irp );
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break;
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//
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// For Query Information operations,
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//
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case IRP_MJ_QUERY_INFORMATION:
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(VOID) NtfsCommonQueryInformation( IrpContext, Irp );
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break;
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//
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// For Set Information operations,
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//
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case IRP_MJ_SET_INFORMATION:
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(VOID) NtfsCommonSetInformation( IrpContext, Irp );
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break;
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//
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// For Query EA operations,
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//
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case IRP_MJ_QUERY_EA:
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(VOID) NtfsCommonQueryEa( IrpContext, Irp );
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break;
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//
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// For Set EA operations,
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//
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case IRP_MJ_SET_EA:
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(VOID) NtfsCommonSetEa( IrpContext, Irp );
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break;
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//
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// For Flush buffers operations,
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//
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case IRP_MJ_FLUSH_BUFFERS:
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(VOID) NtfsCommonFlushBuffers( IrpContext, Irp );
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break;
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//
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// For Query Volume Information operations,
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//
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case IRP_MJ_QUERY_VOLUME_INFORMATION:
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(VOID) NtfsCommonQueryVolumeInfo( IrpContext, Irp );
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break;
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//
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// For Set Volume Information operations,
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//
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case IRP_MJ_SET_VOLUME_INFORMATION:
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(VOID) NtfsCommonSetVolumeInfo( IrpContext, Irp );
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break;
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//
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// For File Cleanup operations,
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//
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case IRP_MJ_CLEANUP:
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(VOID) NtfsCommonCleanup( IrpContext, Irp );
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break;
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//
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// For Directory Control operations,
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//
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case IRP_MJ_DIRECTORY_CONTROL:
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(VOID) NtfsCommonDirectoryControl( IrpContext, Irp );
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break;
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//
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// For File System Control operations,
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//
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case IRP_MJ_FILE_SYSTEM_CONTROL:
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(VOID) NtfsCommonFileSystemControl( IrpContext, Irp );
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break;
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//
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// For Lock Control operations,
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//
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case IRP_MJ_LOCK_CONTROL:
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(VOID) NtfsCommonLockControl( IrpContext, Irp );
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break;
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//
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// For Device Control operations,
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//
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case IRP_MJ_DEVICE_CONTROL:
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(VOID) NtfsCommonDeviceControl( IrpContext, Irp );
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break;
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//
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// For Query Security Information operations,
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//
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case IRP_MJ_QUERY_SECURITY:
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(VOID) NtfsCommonQuerySecurityInfo( IrpContext, Irp );
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break;
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//
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// For Set Security Information operations,
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//
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case IRP_MJ_SET_SECURITY:
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(VOID) NtfsCommonSetSecurityInfo( IrpContext, Irp );
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break;
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//
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// For Query Quota operations,
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//
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case IRP_MJ_QUERY_QUOTA:
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(VOID) NtfsCommonQueryQuota( IrpContext, Irp );
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break;
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//
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// For Set Quota operations,
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//
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case IRP_MJ_SET_QUOTA:
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(VOID) NtfsCommonSetQuota( IrpContext, Irp );
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break;
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//
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// For any other major operations, return an invalid
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// request.
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//
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default:
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NtfsCompleteRequest( IrpContext, Irp, STATUS_INVALID_DEVICE_REQUEST );
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break;
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}
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//
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// Otherwise complete the request to clean up this Irp Context.
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//
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} else {
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NtfsCompleteRequest( IrpContext, NULL, STATUS_SUCCESS );
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IrpContext = NULL;
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}
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ASSERT( IoGetTopLevelIrp() != (PIRP) &TopLevelContext );
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} except(NtfsExceptionFilter( IrpContext, GetExceptionInformation() )) {
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PIO_STACK_LOCATION IrpSp;
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//
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// We had some trouble trying to perform the requested
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// operation, so we'll abort the I/O request with
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// the error status that we get back from the
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// execption code
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//
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if (Irp != NULL) {
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IrpSp = IoGetCurrentIrpStackLocation( Irp );
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Status = GetExceptionCode();
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if ((Status == STATUS_FILE_DELETED) &&
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((IrpContext->MajorFunction == IRP_MJ_READ) ||
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(IrpContext->MajorFunction == IRP_MJ_WRITE) ||
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((IrpContext->MajorFunction == IRP_MJ_SET_INFORMATION) &&
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(IrpSp->Parameters.SetFile.FileInformationClass == FileEndOfFileInformation)))) {
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IrpContext->ExceptionStatus = Status = STATUS_SUCCESS;
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}
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}
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//
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// If we failed to upgrade the volume's version during mount, we may
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// not have put the right exception code into the irp context yet.
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//
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if ((IrpContext != NULL) &&
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(FlagOn( IrpContext->State, IRP_CONTEXT_STATE_VOL_UPGR_FAILED )) &&
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(IrpContext->MajorFunction == IRP_MJ_FILE_SYSTEM_CONTROL) &&
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(IrpContext->MinorFunction == IRP_MN_MOUNT_VOLUME)) {
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IrpContext->ExceptionStatus = Status;
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}
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//
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// This is the return status code that we want the Irp Completion routine to receive.
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//
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Status = NtfsProcessException( IrpContext, Irp, Status );
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if ((Status == STATUS_CANT_WAIT) || (Status == STATUS_LOG_FILE_FULL)) {
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Retry = TRUE;
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}
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}
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} while (Retry);
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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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PLIST_ENTRY 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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while (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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Entry = VolDo->OverflowQueue.Flink;
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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->OriginatingIrp;
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//
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// If the cancel routine thinks it owns the irp ignore it
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//
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if (NtfsSetCancelRoutine( Irp, NULL, 0, FALSE )) {
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VolDo->OverflowQueueCount -= 1;
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RemoveEntryList( (PLIST_ENTRY)Entry );
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break;
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} else {
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//
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// Release the spinlock to let the cancel routine gain it and finish
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// its action
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//
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KeReleaseSpinLock( &VolDo->OverflowQueueSpinLock, SavedIrql );
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KeAcquireSpinLock( &VolDo->OverflowQueueSpinLock, &SavedIrql );
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Entry = NULL;
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}
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} // endwhile
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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 ) {
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break;
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}
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if (VolDo->OverflowQueueCount < OVERFLOW_QUEUE_LIMIT) {
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KeSetEvent( &VolDo->OverflowQueueEvent, IO_NO_INCREMENT, FALSE );
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}
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//
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// set wait to TRUE, and loop.
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//
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LogFileFullCount = 0;
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SetFlag( IrpContext->State, IRP_CONTEXT_STATE_WAIT );
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continue;
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} else {
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break;
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}
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}
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//
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// Decrement the PostedRequestCount.
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//
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if (VolDo) {
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ExInterlockedAddUlong( &VolDo->PostedRequestCount,
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0xffffffff,
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&VolDo->OverflowQueueSpinLock );
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}
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return;
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}
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VOID
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NtfsPostSpecial (
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IN PIRP_CONTEXT IrpContext,
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IN PVCB Vcb,
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IN POST_SPECIAL_CALLOUT PostSpecialCallout,
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IN PVOID Context
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)
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/*++
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Routine Description:
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This routine posts a special request to a worker thread. The function
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to be called is passed in. The Vcb is referenced to ensure it is not
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deleted while the posted request is excuting.
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Arguments:
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Vcb - Volume control block for volume to post to.
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PostSpecialCallout - Function to be called from the worker thread.
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Context - Context point to pass to the function.
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Return Value:
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None
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--*/
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{
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PIRP_CONTEXT NewIrpContext = NULL;
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UNREFERENCED_PARAMETER( IrpContext );
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PAGED_CODE();
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//
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// Create an IrpContext for use to post the request.
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//
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NtfsInitializeIrpContext( NULL, TRUE, &NewIrpContext );
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NewIrpContext->Vcb = Vcb;
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NewIrpContext->Union.PostSpecialCallout = PostSpecialCallout;
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NewIrpContext->OriginatingIrp = Context;
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//
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// Updating the CloseCount and SystemFileCloseCount allows the volume
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// to be locked or dismounted, but the Vcb will not be deleted. This
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// routine will only be called with non-zero close counts so it is ok
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// to increment theses counts.
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//
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ASSERT( Vcb->CloseCount > 0 );
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InterlockedIncrement( &Vcb->CloseCount );
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InterlockedIncrement( &Vcb->SystemFileCloseCount );
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ExInitializeWorkItem( &NewIrpContext->WorkQueueItem,
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NtfsSpecialDispatch,
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NewIrpContext );
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//
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// Determine if the scavenger is already running.
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//
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ExAcquireFastMutexUnsafe( &NtfsScavengerLock );
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if (NtfsScavengerRunning) {
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//
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// Add this item to the scavanger work list.
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//
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NewIrpContext->WorkQueueItem.List.Flink = NULL;
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if (NtfsScavengerWorkList == NULL) {
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NtfsScavengerWorkList = NewIrpContext;
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} else {
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PIRP_CONTEXT WorkIrpContext;
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WorkIrpContext = NtfsScavengerWorkList;
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while (WorkIrpContext->WorkQueueItem.List.Flink != NULL) {
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WorkIrpContext = (PIRP_CONTEXT)
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WorkIrpContext->WorkQueueItem.List.Flink;
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}
|
||
|
||
WorkIrpContext->WorkQueueItem.List.Flink = (PLIST_ENTRY)
|
||
NewIrpContext;
|
||
}
|
||
|
||
} else {
|
||
|
||
//
|
||
// Start a worker thread to do scavenger work.
|
||
//
|
||
|
||
ExQueueWorkItem( &NewIrpContext->WorkQueueItem, DelayedWorkQueue );
|
||
NtfsScavengerRunning = TRUE;
|
||
}
|
||
|
||
ExReleaseFastMutexUnsafe( &NtfsScavengerLock);
|
||
}
|
||
|
||
|
||
VOID
|
||
NtfsSpecialDispatch (
|
||
PVOID Context
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine is called when a special operation needs to be posted.
|
||
It is called indirectly by NtfsPostSpecial. It is assumes that the
|
||
Vcb is protected from going away by incrementing the volemue close
|
||
counts for a file. If this routine fails nothing is done except
|
||
to clean up the Vcb. This routine also handles issues log file full
|
||
and can't wait.
|
||
|
||
The function to be called is stored in the PostSpecialCallout field
|
||
of the Irp Context, and the context is stored int he OriginatingIrp.
|
||
Both fields are zeroed before the the callout function is called.
|
||
|
||
Arguments:
|
||
|
||
Context - Supplies a pointer to an IrpContext.
|
||
|
||
Return Value:
|
||
|
||
--*/
|
||
|
||
{
|
||
PVCB Vcb;
|
||
PIRP_CONTEXT IrpContext = Context;
|
||
TOP_LEVEL_CONTEXT TopLevelContext;
|
||
PTOP_LEVEL_CONTEXT ThreadTopLevelContext;
|
||
POST_SPECIAL_CALLOUT PostSpecialCallout;
|
||
PVOID SpecialContext;
|
||
ULONG LogFileFullCount;
|
||
BOOLEAN Retry;
|
||
|
||
PAGED_CODE();
|
||
|
||
FsRtlEnterFileSystem();
|
||
|
||
do {
|
||
|
||
Vcb = IrpContext->Vcb;
|
||
LogFileFullCount = 0;
|
||
|
||
//
|
||
// Capture the funciton pointer and context before using the IrpContext.
|
||
//
|
||
|
||
PostSpecialCallout = IrpContext->Union.PostSpecialCallout;
|
||
SpecialContext = IrpContext->OriginatingIrp;
|
||
IrpContext->Union.PostSpecialCallout = NULL;
|
||
IrpContext->OriginatingIrp = NULL;
|
||
|
||
ThreadTopLevelContext = NtfsInitializeTopLevelIrp( &TopLevelContext, TRUE, TRUE );
|
||
ASSERT( ThreadTopLevelContext == &TopLevelContext );
|
||
ASSERT( !FlagOn( IrpContext->State, IRP_CONTEXT_STATE_OWNS_TOP_LEVEL ));
|
||
ASSERT( FlagOn( IrpContext->State, IRP_CONTEXT_STATE_ALLOC_FROM_POOL ));
|
||
|
||
//
|
||
// Initialize the thread top level structure, if needed.
|
||
//
|
||
|
||
ASSERT( IoGetTopLevelIrp() != (PIRP) &TopLevelContext );
|
||
NtfsUpdateIrpContextWithTopLevel( IrpContext, ThreadTopLevelContext );
|
||
|
||
//
|
||
// Don't let this IrpContext be deleted.
|
||
//
|
||
|
||
SetFlag( IrpContext->State, IRP_CONTEXT_STATE_PERSISTENT );
|
||
|
||
do {
|
||
|
||
Retry = FALSE;
|
||
|
||
try {
|
||
|
||
//
|
||
// See if we failed 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 fail 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 );
|
||
}
|
||
}
|
||
|
||
//
|
||
// Call the requested function.
|
||
//
|
||
|
||
ASSERT( FlagOn( IrpContext->TopLevelIrpContext->State, IRP_CONTEXT_STATE_OWNS_TOP_LEVEL ));
|
||
PostSpecialCallout( IrpContext, SpecialContext );
|
||
|
||
NtfsCompleteRequest( IrpContext, NULL, STATUS_SUCCESS );
|
||
|
||
} except(NtfsExceptionFilter( IrpContext, GetExceptionInformation() )) {
|
||
|
||
NTSTATUS ExceptionCode;
|
||
|
||
ExceptionCode = GetExceptionCode();
|
||
ExceptionCode = NtfsProcessException( IrpContext, NULL, ExceptionCode );
|
||
|
||
if ((ExceptionCode == STATUS_CANT_WAIT) ||
|
||
(ExceptionCode == STATUS_LOG_FILE_FULL)) {
|
||
|
||
Retry = TRUE;
|
||
}
|
||
}
|
||
|
||
} while (Retry);
|
||
|
||
//
|
||
// Ok to let this IrpContext be deleted.
|
||
//
|
||
|
||
ClearFlag( IrpContext->State, IRP_CONTEXT_STATE_PERSISTENT );
|
||
|
||
//
|
||
// At this point regardless of the status the volume needs to
|
||
// be cleaned up and the IrpContext freed.
|
||
// Dereference the Vcb and check to see if it needs to be deleted.
|
||
// since this call might raise wrap it with a try/execpt.
|
||
//
|
||
|
||
try {
|
||
|
||
//
|
||
// Acquire the volume exclusive so the counts can be
|
||
// updated.
|
||
//
|
||
|
||
ASSERT( FlagOn( IrpContext->State, IRP_CONTEXT_STATE_WAIT ));
|
||
NtfsAcquireExclusiveVcb( IrpContext, Vcb, TRUE );
|
||
|
||
InterlockedDecrement( &Vcb->SystemFileCloseCount );
|
||
InterlockedDecrement( &Vcb->CloseCount );
|
||
|
||
NtfsReleaseVcb( IrpContext, Vcb );
|
||
|
||
} except( EXCEPTION_EXECUTE_HANDLER ) {
|
||
|
||
ASSERT( FsRtlIsNtstatusExpected( GetExceptionCode() ) );
|
||
}
|
||
|
||
//
|
||
// Free the irp context.
|
||
//
|
||
|
||
NtfsCleanupIrpContext( IrpContext, TRUE );
|
||
|
||
//
|
||
// See if there is more work on the scavenger list.
|
||
//
|
||
|
||
ExAcquireFastMutexUnsafe( &NtfsScavengerLock );
|
||
|
||
ASSERT( NtfsScavengerRunning );
|
||
|
||
IrpContext = NtfsScavengerWorkList;
|
||
|
||
if (IrpContext != NULL) {
|
||
|
||
//
|
||
// Remove the entry from the list.
|
||
//
|
||
|
||
NtfsScavengerWorkList = (PIRP_CONTEXT) IrpContext->WorkQueueItem.List.Flink;
|
||
IrpContext->WorkQueueItem.List.Flink = NULL;
|
||
|
||
} else {
|
||
|
||
NtfsScavengerRunning = FALSE;
|
||
|
||
}
|
||
|
||
ExReleaseFastMutexUnsafe( &NtfsScavengerLock );
|
||
|
||
} while ( IrpContext != NULL );
|
||
|
||
FsRtlExitFileSystem();
|
||
}
|