1811 lines
56 KiB
C
1811 lines
56 KiB
C
/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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DirCtrl.c
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Abstract:
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This module implements the File Directory Control routine for Ntfs called
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by the dispatch driver.
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Author:
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Tom Miller [TomM] 1-Jan-1992
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(Based heavily on GaryKi's dirctrl.c for pinball.)
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Revision History:
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--*/
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#include "NtfsProc.h"
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//
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// The local debug trace level
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//
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#define Dbg (DEBUG_TRACE_DIRCTRL)
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//
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// Define a tag for general pool allocations from this module
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//
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#undef MODULE_POOL_TAG
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#define MODULE_POOL_TAG ('dFtN')
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NTSTATUS
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NtfsQueryDirectory (
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IN PIRP_CONTEXT IrpContext,
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IN PIRP Irp,
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IN PVCB Vcb,
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IN PSCB Scb,
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IN PCCB Ccb
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);
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NTSTATUS
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NtfsNotifyChangeDirectory (
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IN PIRP_CONTEXT IrpContext,
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IN PIRP Irp,
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IN PVCB Vcb,
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IN PSCB Scb,
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IN PCCB Ccb
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);
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, NtfsCommonDirectoryControl)
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#pragma alloc_text(PAGE, NtfsFsdDirectoryControl)
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#pragma alloc_text(PAGE, NtfsNotifyChangeDirectory)
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#pragma alloc_text(PAGE, NtfsReportViewIndexNotify)
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#pragma alloc_text(PAGE, NtfsQueryDirectory)
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#endif
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NTSTATUS
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NtfsFsdDirectoryControl (
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IN PVOLUME_DEVICE_OBJECT VolumeDeviceObject,
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IN PIRP Irp
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)
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/*++
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Routine Description:
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This routine implements the FSD part of Directory Control.
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Arguments:
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VolumeDeviceObject - Supplies the volume device object where the
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file exists
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Irp - Supplies the Irp being processed
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Return Value:
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NTSTATUS - The FSD status for the IRP
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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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NTSTATUS Status = STATUS_SUCCESS;
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PIRP_CONTEXT IrpContext = NULL;
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IRP_CONTEXT LocalIrpContext;
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BOOLEAN Wait;
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ASSERT_IRP( Irp );
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UNREFERENCED_PARAMETER( VolumeDeviceObject );
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PAGED_CODE();
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DebugTrace( +1, Dbg, ("NtfsFsdDirectoryControl\n") );
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//
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// Call the common Directory Control routine
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//
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FsRtlEnterFileSystem();
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//
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// Always make these requests look top level.
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//
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ThreadTopLevelContext = NtfsInitializeTopLevelIrp( &TopLevelContext, TRUE, TRUE );
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do {
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try {
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//
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// We are either initiating this request or retrying it.
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//
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if (IrpContext == NULL) {
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//
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// Allocate and initialize the IrpContext.
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//
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Wait = FALSE;
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if (CanFsdWait( Irp )) {
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Wait = TRUE;
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IrpContext = &LocalIrpContext;
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}
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NtfsInitializeIrpContext( Irp, Wait, &IrpContext );
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//
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// Initialize the thread top level structure, if needed.
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//
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NtfsUpdateIrpContextWithTopLevel( IrpContext, ThreadTopLevelContext );
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} else if (Status == STATUS_LOG_FILE_FULL) {
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NtfsCheckpointForLogFileFull( IrpContext );
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}
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Status = NtfsCommonDirectoryControl( IrpContext, Irp );
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break;
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} except(NtfsExceptionFilter( IrpContext, GetExceptionInformation() )) {
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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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Status = NtfsProcessException( IrpContext, Irp, GetExceptionCode() );
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}
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} while (Status == STATUS_CANT_WAIT ||
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Status == STATUS_LOG_FILE_FULL);
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ASSERT( IoGetTopLevelIrp() != (PIRP) &TopLevelContext );
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FsRtlExitFileSystem();
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//
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// And return to our caller
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//
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DebugTrace( -1, Dbg, ("NtfsFsdDirectoryControl -> %08lx\n", Status) );
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return Status;
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}
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NTSTATUS
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NtfsCommonDirectoryControl (
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IN PIRP_CONTEXT IrpContext,
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IN PIRP Irp
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)
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/*++
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Routine Description:
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This is the common routine for Directory Control called by both the fsd
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and fsp threads.
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Arguments:
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Irp - Supplies the Irp to process
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Return Value:
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NTSTATUS - The return status for the operation
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--*/
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{
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NTSTATUS Status;
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PIO_STACK_LOCATION IrpSp;
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PFILE_OBJECT FileObject;
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TYPE_OF_OPEN TypeOfOpen;
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PVCB Vcb;
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PSCB Scb;
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PCCB Ccb;
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PFCB Fcb;
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ASSERT_IRP_CONTEXT( IrpContext );
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ASSERT_IRP( Irp );
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ASSERT( FlagOn( IrpContext->TopLevelIrpContext->State, IRP_CONTEXT_STATE_OWNS_TOP_LEVEL ));
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PAGED_CODE();
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//
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// Get the current Irp stack location
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//
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IrpSp = IoGetCurrentIrpStackLocation( Irp );
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DebugTrace( +1, Dbg, ("NtfsCommonDirectoryControl\n") );
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DebugTrace( 0, Dbg, ("IrpContext = %08lx\n", IrpContext) );
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DebugTrace( 0, Dbg, ("Irp = %08lx\n", Irp) );
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//
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// Extract and decode the file object
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//
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FileObject = IrpSp->FileObject;
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TypeOfOpen = NtfsDecodeFileObject( IrpContext, FileObject, &Vcb, &Fcb, &Scb, &Ccb, TRUE );
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//
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// We know this is a directory control so we'll case on the
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// minor function, and call an internal worker routine to complete
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// the irp.
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//
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switch ( IrpSp->MinorFunction ) {
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case IRP_MN_QUERY_DIRECTORY:
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//
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// Decide if this is a view or filename index.
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//
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if ((UserViewIndexOpen == TypeOfOpen) &&
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FlagOn( Scb->ScbState, SCB_STATE_VIEW_INDEX )) {
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Status = NtfsQueryViewIndex( IrpContext, Irp, Vcb, Scb, Ccb );
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} else if ((UserDirectoryOpen == TypeOfOpen) &&
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!FlagOn( Scb->ScbState, SCB_STATE_VIEW_INDEX )) {
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Status = NtfsQueryDirectory( IrpContext, Irp, Vcb, Scb, Ccb );
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} else {
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NtfsCompleteRequest( IrpContext, Irp, STATUS_INVALID_PARAMETER );
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DebugTrace( -1, Dbg, ("NtfsCommonDirectoryControl -> STATUS_INVALID_PARAMETER\n") );
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return STATUS_INVALID_PARAMETER;
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}
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break;
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case IRP_MN_NOTIFY_CHANGE_DIRECTORY:
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//
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// We can't perform this operation on open by Id or if the caller has
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// closed his handle. Make sure the handle is for either a view index
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// or file name index.
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//
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if (((TypeOfOpen != UserDirectoryOpen) &&
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(TypeOfOpen != UserViewIndexOpen)) ||
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FlagOn( Ccb->Flags, CCB_FLAG_OPEN_BY_FILE_ID ) ||
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FlagOn( FileObject->Flags, FO_CLEANUP_COMPLETE )) {
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NtfsCompleteRequest( IrpContext, Irp, STATUS_INVALID_PARAMETER );
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DebugTrace( -1, Dbg, ("NtfsCommonDirectoryControl -> STATUS_INVALID_PARAMETER\n") );
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return STATUS_INVALID_PARAMETER;
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}
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Status = NtfsNotifyChangeDirectory( IrpContext, Irp, Vcb, Scb, Ccb );
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break;
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default:
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DebugTrace( 0, Dbg, ("Invalid Minor Function %08lx\n", IrpSp->MinorFunction) );
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NtfsCompleteRequest( IrpContext, Irp, STATUS_INVALID_DEVICE_REQUEST );
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Status = STATUS_INVALID_DEVICE_REQUEST;
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break;
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}
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//
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// And return to our caller
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//
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DebugTrace( -1, Dbg, ("NtfsCommonDirectoryControl -> %08lx\n", Status) );
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return Status;
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}
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VOID
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NtfsReportViewIndexNotify (
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IN PVCB Vcb,
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IN PFCB Fcb,
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IN ULONG FilterMatch,
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IN ULONG Action,
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IN PVOID ChangeInfoBuffer,
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IN USHORT ChangeInfoBufferLength
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)
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/*++
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Routine Description:
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This function notifies processes that there has been a change to a
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view index they are watching. It is analogous to the NtfsReportDirNotify
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macro, which is used only for directories, while this function is used
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only for view indices.
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||
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Arguments:
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||
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Vcb - The volume on which the change is taking place.
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||
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Fcb - The file on which the change is taking place.
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FilterMatch - This flag field is compared with the completion filter
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in the notify structure. If any of the corresponding bits in the
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completion filter are set, then a notify condition exists.
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Action - This is the action code to store in the user's buffer if
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present.
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ChangeInfoBuffer - Pointer to a buffer of information related to the
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change being reported. This information is returned to the
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process that owns the notify handle.
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ChangeInfoBufferLength - The length, in bytes, of the buffer passed
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in ChangeInfoBuffer.
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Return Value:
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None.
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--*/
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{
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STRING ChangeInfo;
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PAGED_CODE( );
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ChangeInfo.Length = ChangeInfo.MaximumLength = ChangeInfoBufferLength;
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ChangeInfo.Buffer = ChangeInfoBuffer;
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FsRtlNotifyFilterReportChange( Vcb->NotifySync,
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&Vcb->ViewIndexNotifyList,
|
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NULL,
|
||
0,
|
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&ChangeInfo,
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&ChangeInfo,
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FilterMatch,
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Action,
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Fcb,
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NULL );
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}
|
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|
||
|
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//
|
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// Local Support Routine
|
||
//
|
||
|
||
NTSTATUS
|
||
NtfsQueryDirectory (
|
||
IN PIRP_CONTEXT IrpContext,
|
||
IN PIRP Irp,
|
||
IN PVCB Vcb,
|
||
IN PSCB Scb,
|
||
IN PCCB Ccb
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine performs the query directory operation. It is responsible
|
||
for either completing or enqueuing the input Irp.
|
||
|
||
Arguments:
|
||
|
||
Irp - Supplies the Irp to process
|
||
|
||
Vcb - Supplies its Vcb
|
||
|
||
Scb - Supplies its Scb
|
||
|
||
Ccb - Supplies its Ccb
|
||
|
||
Return Value:
|
||
|
||
NTSTATUS - The return status for the operation
|
||
|
||
--*/
|
||
|
||
{
|
||
NTSTATUS Status = STATUS_SUCCESS;
|
||
PIO_STACK_LOCATION IrpSp;
|
||
|
||
PUCHAR Buffer;
|
||
CLONG UserBufferLength;
|
||
|
||
ULONG BaseLength;
|
||
|
||
PUNICODE_STRING UniFileName;
|
||
FILE_INFORMATION_CLASS FileInformationClass;
|
||
ULONG FileIndex;
|
||
BOOLEAN RestartScan;
|
||
BOOLEAN ReturnSingleEntry;
|
||
BOOLEAN IndexSpecified;
|
||
BOOLEAN AccessingUserBuffer = FALSE;
|
||
|
||
BOOLEAN IgnoreCase;
|
||
|
||
BOOLEAN NextFlag;
|
||
|
||
BOOLEAN GotEntry;
|
||
|
||
BOOLEAN CallRestart;
|
||
|
||
ULONG NextEntry;
|
||
ULONG LastEntry;
|
||
|
||
PFILE_DIRECTORY_INFORMATION DirInfo;
|
||
PFILE_FULL_DIR_INFORMATION FullDirInfo;
|
||
PFILE_BOTH_DIR_INFORMATION BothDirInfo;
|
||
PFILE_NAMES_INFORMATION NamesInfo;
|
||
|
||
PFILE_NAME FileNameBuffer;
|
||
PVOID UnwindFileNameBuffer = NULL;
|
||
ULONG FileNameLength;
|
||
|
||
ULONG SizeOfFileName = FIELD_OFFSET( FILE_NAME, FileName );
|
||
|
||
INDEX_CONTEXT OtherContext;
|
||
|
||
PFCB AcquiredFcb = NULL;
|
||
|
||
BOOLEAN VcbAcquired = FALSE;
|
||
BOOLEAN CcbAcquired = FALSE;
|
||
|
||
BOOLEAN ScbAcquired = FALSE;
|
||
BOOLEAN FirstQuery = FALSE;
|
||
|
||
ASSERT_IRP_CONTEXT( IrpContext );
|
||
ASSERT_IRP( Irp );
|
||
ASSERT_VCB( Vcb );
|
||
ASSERT_CCB( Ccb );
|
||
ASSERT_SCB( Scb );
|
||
|
||
PAGED_CODE();
|
||
|
||
//
|
||
// Get the current Stack location
|
||
//
|
||
|
||
IrpSp = IoGetCurrentIrpStackLocation( Irp );
|
||
|
||
DebugTrace( +1, Dbg, ("NtfsQueryDirectory...\n") );
|
||
DebugTrace( 0, Dbg, ("IrpContext = %08lx\n", IrpContext) );
|
||
DebugTrace( 0, Dbg, ("Irp = %08lx\n", Irp) );
|
||
DebugTrace( 0, Dbg, (" ->Length = %08lx\n", IrpSp->Parameters.QueryDirectory.Length) );
|
||
DebugTrace( 0, Dbg, (" ->FileName = %08lx\n", IrpSp->Parameters.QueryDirectory.FileName) );
|
||
DebugTrace( 0, Dbg, (" ->FileInformationClass = %08lx\n", IrpSp->Parameters.QueryDirectory.FileInformationClass) );
|
||
DebugTrace( 0, Dbg, (" ->FileIndex = %08lx\n", IrpSp->Parameters.QueryDirectory.FileIndex) );
|
||
DebugTrace( 0, Dbg, (" ->SystemBuffer = %08lx\n", Irp->AssociatedIrp.SystemBuffer) );
|
||
DebugTrace( 0, Dbg, (" ->RestartScan = %08lx\n", FlagOn(IrpSp->Flags, SL_RESTART_SCAN)) );
|
||
DebugTrace( 0, Dbg, (" ->ReturnSingleEntry = %08lx\n", FlagOn(IrpSp->Flags, SL_RETURN_SINGLE_ENTRY)) );
|
||
DebugTrace( 0, Dbg, (" ->IndexSpecified = %08lx\n", FlagOn(IrpSp->Flags, SL_INDEX_SPECIFIED)) );
|
||
DebugTrace( 0, Dbg, ("Vcb = %08lx\n", Vcb) );
|
||
DebugTrace( 0, Dbg, ("Scb = %08lx\n", Scb) );
|
||
DebugTrace( 0, Dbg, ("Ccb = %08lx\n", Ccb) );
|
||
|
||
#if DBG
|
||
//
|
||
// Enable debug port displays when certain enumeration strings are given
|
||
//
|
||
|
||
#if NTFSPOOLCHECK
|
||
if (IrpSp->Parameters.QueryDirectory.FileName != NULL) {
|
||
if (IrpSp->Parameters.QueryDirectory.FileName->Length >= 10 &&
|
||
RtlEqualMemory( IrpSp->Parameters.QueryDirectory.FileName->Buffer, L"$HEAP", 10 )) {
|
||
|
||
NtfsDebugHeapDump( (PUNICODE_STRING) IrpSp->Parameters.QueryDirectory.FileName );
|
||
|
||
}
|
||
}
|
||
#endif // NTFSPOOLCHECK
|
||
#endif // DBG
|
||
|
||
//
|
||
// Because we probably need to do the I/O anyway we'll reject any request
|
||
// right now that cannot wait for I/O. We do not want to abort after
|
||
// processing a few index entries.
|
||
//
|
||
|
||
if (!FlagOn(IrpContext->State, IRP_CONTEXT_STATE_WAIT)) {
|
||
|
||
DebugTrace( 0, Dbg, ("Automatically enqueue Irp to Fsp\n") );
|
||
|
||
Status = NtfsPostRequest( IrpContext, Irp );
|
||
|
||
DebugTrace( -1, Dbg, ("NtfsQueryDirectory -> %08lx\n", Status) );
|
||
return Status;
|
||
}
|
||
|
||
//
|
||
// Reference our input parameters to make things easier
|
||
//
|
||
|
||
UserBufferLength = IrpSp->Parameters.QueryDirectory.Length;
|
||
|
||
FileInformationClass = IrpSp->Parameters.QueryDirectory.FileInformationClass;
|
||
FileIndex = IrpSp->Parameters.QueryDirectory.FileIndex;
|
||
|
||
//
|
||
// Look in the Ccb to see the type of search.
|
||
//
|
||
|
||
IgnoreCase = BooleanFlagOn( Ccb->Flags, CCB_FLAG_IGNORE_CASE );
|
||
|
||
RestartScan = BooleanFlagOn(IrpSp->Flags, SL_RESTART_SCAN);
|
||
ReturnSingleEntry = BooleanFlagOn(IrpSp->Flags, SL_RETURN_SINGLE_ENTRY);
|
||
IndexSpecified = BooleanFlagOn(IrpSp->Flags, SL_INDEX_SPECIFIED);
|
||
|
||
//
|
||
// Determine the size of the constant part of the structure.
|
||
//
|
||
|
||
switch (FileInformationClass) {
|
||
|
||
case FileDirectoryInformation:
|
||
|
||
BaseLength = FIELD_OFFSET( FILE_DIRECTORY_INFORMATION,
|
||
FileName[0] );
|
||
break;
|
||
|
||
case FileFullDirectoryInformation:
|
||
|
||
BaseLength = FIELD_OFFSET( FILE_FULL_DIR_INFORMATION,
|
||
FileName[0] );
|
||
break;
|
||
|
||
case FileIdFullDirectoryInformation:
|
||
|
||
BaseLength = FIELD_OFFSET( FILE_ID_FULL_DIR_INFORMATION,
|
||
FileName[0] );
|
||
break;
|
||
|
||
case FileNamesInformation:
|
||
|
||
BaseLength = FIELD_OFFSET( FILE_NAMES_INFORMATION,
|
||
FileName[0] );
|
||
break;
|
||
|
||
case FileBothDirectoryInformation:
|
||
|
||
BaseLength = FIELD_OFFSET( FILE_BOTH_DIR_INFORMATION,
|
||
FileName[0] );
|
||
break;
|
||
|
||
case FileIdBothDirectoryInformation:
|
||
|
||
BaseLength = FIELD_OFFSET( FILE_ID_BOTH_DIR_INFORMATION,
|
||
FileName[0] );
|
||
break;
|
||
|
||
default:
|
||
|
||
Status = STATUS_INVALID_INFO_CLASS;
|
||
NtfsCompleteRequest( IrpContext, Irp, Status );
|
||
DebugTrace( -1, Dbg, ("NtfsQueryDirectory -> %08lx\n", Status) );
|
||
return Status;
|
||
}
|
||
|
||
NtfsInitializeIndexContext( &OtherContext );
|
||
|
||
//
|
||
// Use a try-finally to facilitate cleanup.
|
||
//
|
||
|
||
try {
|
||
|
||
//
|
||
// We only allow one active request in this handle at a time. If this is
|
||
// not a synchronous request then wait on the handle.
|
||
//
|
||
|
||
if (!FlagOn( IrpSp->FileObject->Flags, FO_SYNCHRONOUS_IO )) {
|
||
|
||
EOF_WAIT_BLOCK WaitBlock;
|
||
NtfsAcquireIndexCcb( Scb, Ccb, &WaitBlock );
|
||
CcbAcquired = TRUE;
|
||
}
|
||
|
||
//
|
||
// We have to create a File Name string for querying if there is either
|
||
// one specified in this request, or we do not already have a value
|
||
// in the Ccb. If we already have one then we will ignore the input
|
||
// name in this case unless the INDEX_SPECIFIED bit is set.
|
||
//
|
||
|
||
if ((Ccb->QueryBuffer == NULL) ||
|
||
((IrpSp->Parameters.QueryDirectory.FileName != NULL) && IndexSpecified)) {
|
||
|
||
//
|
||
// Now, if the input string is NULL, we have to create the default
|
||
// string "*".
|
||
//
|
||
|
||
if (IrpSp->Parameters.QueryDirectory.FileName == NULL) {
|
||
|
||
FileNameLength = SizeOfFileName + sizeof(WCHAR);
|
||
FileNameBuffer = NtfsAllocatePool(PagedPool, FileNameLength );
|
||
|
||
//
|
||
// Initialize it.
|
||
//
|
||
|
||
FileNameBuffer->ParentDirectory = Scb->Fcb->FileReference;
|
||
FileNameBuffer->FileNameLength = 1;
|
||
FileNameBuffer->Flags = 0;
|
||
FileNameBuffer->FileName[0] = '*';
|
||
|
||
//
|
||
// We know we have an input file name, and we may or may not already
|
||
// have one in the Ccb. Allocate space for it, initialize it, and
|
||
// set up to deallocate on the way out if we already have a pattern
|
||
// in the Ccb.
|
||
//
|
||
|
||
} else {
|
||
|
||
UniFileName = (PUNICODE_STRING) IrpSp->Parameters.QueryDirectory.FileName;
|
||
|
||
if (!NtfsIsFileNameValid(UniFileName, TRUE)) {
|
||
|
||
if (Ccb->QueryBuffer == NULL
|
||
|| UniFileName->Length > 4
|
||
|| UniFileName->Length == 0
|
||
|| UniFileName->Buffer[0] != L'.'
|
||
|| (UniFileName->Length == 4
|
||
&& UniFileName->Buffer[1] != L'.')) {
|
||
|
||
try_return( Status = STATUS_OBJECT_NAME_INVALID );
|
||
}
|
||
}
|
||
|
||
FileNameLength = (USHORT)IrpSp->Parameters.QueryDirectory.FileName->Length;
|
||
|
||
FileNameBuffer = NtfsAllocatePool(PagedPool, SizeOfFileName + FileNameLength );
|
||
|
||
RtlCopyMemory( FileNameBuffer->FileName,
|
||
UniFileName->Buffer,
|
||
FileNameLength );
|
||
|
||
FileNameLength += SizeOfFileName;
|
||
|
||
FileNameBuffer->ParentDirectory = Scb->Fcb->FileReference;
|
||
FileNameBuffer->FileNameLength = (UCHAR)((FileNameLength - SizeOfFileName) / sizeof( WCHAR ));
|
||
FileNameBuffer->Flags = 0;
|
||
}
|
||
|
||
//
|
||
// If we already have a query buffer, deallocate this on the way
|
||
// out.
|
||
//
|
||
|
||
if (Ccb->QueryBuffer != NULL) {
|
||
|
||
//
|
||
// If we have a name to resume from then override the restart
|
||
// scan boolean.
|
||
//
|
||
|
||
if ((UnwindFileNameBuffer = FileNameBuffer) != NULL) {
|
||
|
||
RestartScan = FALSE;
|
||
}
|
||
|
||
//
|
||
// Otherwise, store this one in the Ccb.
|
||
//
|
||
|
||
} else {
|
||
|
||
UNICODE_STRING Expression;
|
||
|
||
Ccb->QueryBuffer = (PVOID)FileNameBuffer;
|
||
Ccb->QueryLength = (USHORT)FileNameLength;
|
||
FirstQuery = TRUE;
|
||
|
||
//
|
||
// If the search expression contains a wild card then remember this in
|
||
// the Ccb.
|
||
//
|
||
|
||
Expression.MaximumLength =
|
||
Expression.Length = FileNameBuffer->FileNameLength * sizeof( WCHAR );
|
||
Expression.Buffer = FileNameBuffer->FileName;
|
||
|
||
//
|
||
// When we establish the search pattern, we must also establish
|
||
// whether the user wants to see "." and "..". This code does
|
||
// not necessarily have to be perfect (he said), but should be
|
||
// good enough to catch the common cases. Dos does not have
|
||
// perfect semantics for these cases, and the following determination
|
||
// will mimic what FastFat does exactly.
|
||
//
|
||
|
||
if (Scb != Vcb->RootIndexScb) {
|
||
static UNICODE_STRING DotString = CONSTANT_UNICODE_STRING( L"." );
|
||
|
||
if (FsRtlDoesNameContainWildCards(&Expression)) {
|
||
|
||
if (FsRtlIsNameInExpression( &Expression,
|
||
&DotString,
|
||
FALSE,
|
||
NULL )) {
|
||
|
||
|
||
SetFlag( Ccb->Flags, CCB_FLAG_RETURN_DOT | CCB_FLAG_RETURN_DOTDOT );
|
||
}
|
||
} else {
|
||
if (NtfsAreNamesEqual( Vcb->UpcaseTable, &Expression, &DotString, FALSE )) {
|
||
|
||
SetFlag( Ccb->Flags, CCB_FLAG_RETURN_DOT | CCB_FLAG_RETURN_DOTDOT );
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
//
|
||
// Otherwise we are just restarting the query from the Ccb.
|
||
//
|
||
|
||
} else {
|
||
|
||
FileNameBuffer = (PFILE_NAME)Ccb->QueryBuffer;
|
||
FileNameLength = Ccb->QueryLength;
|
||
}
|
||
|
||
Irp->IoStatus.Information = 0;
|
||
|
||
//
|
||
// Use a try-except to handle errors accessing the user buffer.
|
||
//
|
||
|
||
try {
|
||
|
||
ULONG BytesToCopy;
|
||
|
||
FCB_TABLE_ELEMENT Key;
|
||
PFCB_TABLE_ELEMENT Entry;
|
||
|
||
BOOLEAN MatchAll = FALSE;
|
||
|
||
//
|
||
// See if we are supposed to try to acquire an Fcb on this
|
||
// resume.
|
||
//
|
||
|
||
if (Ccb->FcbToAcquire.LongValue != 0) {
|
||
|
||
//
|
||
// First we need to acquire the Vcb shared, since we will
|
||
// acquire two Fcbs.
|
||
//
|
||
|
||
NtfsAcquireSharedVcb( IrpContext, Vcb, TRUE );
|
||
VcbAcquired = TRUE;
|
||
|
||
//
|
||
// Now look up the Fcb, and if it is there, reference it
|
||
// and remember it.
|
||
//
|
||
|
||
Key.FileReference = Ccb->FcbToAcquire.FileReference;
|
||
NtfsAcquireFcbTable( IrpContext, Vcb );
|
||
Entry = RtlLookupElementGenericTable( &Vcb->FcbTable, &Key );
|
||
if (Entry != NULL) {
|
||
AcquiredFcb = Entry->Fcb;
|
||
AcquiredFcb->ReferenceCount += 1;
|
||
}
|
||
NtfsReleaseFcbTable( IrpContext, Vcb );
|
||
|
||
//
|
||
// Now that it cannot go anywhere, acquire it.
|
||
//
|
||
|
||
if (AcquiredFcb != NULL) {
|
||
NtfsAcquireSharedFcb( IrpContext, AcquiredFcb, NULL, ACQUIRE_NO_DELETE_CHECK );
|
||
}
|
||
|
||
//
|
||
// Now that we actually acquired it, we may as well clear this
|
||
// field.
|
||
//
|
||
|
||
Ccb->FcbToAcquire.LongValue = 0;
|
||
}
|
||
|
||
//
|
||
// Acquire shared access to the Scb.
|
||
//
|
||
|
||
NtfsAcquireSharedScb( IrpContext, Scb );
|
||
ScbAcquired = TRUE;
|
||
|
||
//
|
||
// Now that we have both files acquired, we can free the Vcb.
|
||
//
|
||
|
||
if (VcbAcquired) {
|
||
NtfsReleaseVcb( IrpContext, Vcb );
|
||
VcbAcquired = FALSE;
|
||
}
|
||
|
||
//
|
||
// If the volume is no longer mounted, we should fail this
|
||
// request. Since we have the Scb shared now, we know that
|
||
// a dismount request can't sneak in.
|
||
//
|
||
|
||
if (FlagOn( Scb->ScbState, SCB_STATE_VOLUME_DISMOUNTED )) {
|
||
|
||
try_return( Status = STATUS_VOLUME_DISMOUNTED );
|
||
}
|
||
|
||
//
|
||
// If we are in the Fsp now because we had to wait earlier,
|
||
// we must map the user buffer, otherwise we can use the
|
||
// user's buffer directly.
|
||
//
|
||
|
||
Buffer = NtfsMapUserBuffer( Irp );
|
||
|
||
//
|
||
// Check if this is the first call to query directory for this file
|
||
// object. It is the first call if the enumeration context field of
|
||
// the ccb is null. Also check if we are to restart the scan.
|
||
//
|
||
|
||
if (FirstQuery || RestartScan) {
|
||
|
||
CallRestart = TRUE;
|
||
NextFlag = FALSE;
|
||
|
||
//
|
||
// On first/restarted scan, note that we have not returned either
|
||
// of these guys.
|
||
//
|
||
|
||
ClearFlag( Ccb->Flags, CCB_FLAG_DOT_RETURNED | CCB_FLAG_DOTDOT_RETURNED );
|
||
|
||
//
|
||
// Otherwise check to see if we were given a file name to restart from
|
||
//
|
||
|
||
} else if (UnwindFileNameBuffer != NULL) {
|
||
|
||
CallRestart = TRUE;
|
||
NextFlag = TRUE;
|
||
|
||
//
|
||
// The guy could actually be asking to return to one of the dot
|
||
// file positions, so we must handle that correctly.
|
||
//
|
||
|
||
if ((FileNameBuffer->FileNameLength <= 2) &&
|
||
(FileNameBuffer->FileName[0] == L'.')) {
|
||
|
||
if (FileNameBuffer->FileNameLength == 1) {
|
||
|
||
//
|
||
// He wants to resume after ".", so we set to return
|
||
// ".." again, and change the temporary pattern to
|
||
// rewind our context to the front.
|
||
//
|
||
|
||
ClearFlag( Ccb->Flags, CCB_FLAG_DOTDOT_RETURNED );
|
||
SetFlag( Ccb->Flags, CCB_FLAG_DOT_RETURNED );
|
||
|
||
FileNameBuffer->FileName[0] = L'*';
|
||
NextFlag = FALSE;
|
||
|
||
} else if (FileNameBuffer->FileName[1] == L'.') {
|
||
|
||
//
|
||
// He wants to resume after "..", so we the change
|
||
// the temporary pattern to rewind our context to the
|
||
// front.
|
||
//
|
||
|
||
SetFlag( Ccb->Flags, CCB_FLAG_DOT_RETURNED | CCB_FLAG_DOTDOT_RETURNED );
|
||
FileNameBuffer->FileName[0] =
|
||
FileNameBuffer->FileName[1] = L'*';
|
||
NextFlag = FALSE;
|
||
}
|
||
|
||
//
|
||
// Always return the entry after the user's file name.
|
||
//
|
||
|
||
} else {
|
||
|
||
SetFlag( Ccb->Flags, CCB_FLAG_DOT_RETURNED | CCB_FLAG_DOTDOT_RETURNED );
|
||
}
|
||
|
||
//
|
||
// Otherwise we're simply continuing a previous enumeration from
|
||
// where we last left off. And we always leave off one beyond the
|
||
// last entry we returned.
|
||
//
|
||
|
||
} else {
|
||
|
||
CallRestart = FALSE;
|
||
NextFlag = FALSE;
|
||
}
|
||
|
||
//
|
||
// At this point we are about to enter our query loop. We have
|
||
// already decided if we need to call restart or continue when we
|
||
// go after an index entry. The variables LastEntry and NextEntry are
|
||
// used to index into the user buffer. LastEntry is the last entry
|
||
// we added to the user buffer, and NextEntry is the current
|
||
// one we're working on.
|
||
//
|
||
|
||
LastEntry = 0;
|
||
NextEntry = 0;
|
||
|
||
//
|
||
// Remember if we are matching everything by checking these two common
|
||
// cases.
|
||
//
|
||
|
||
MatchAll = (FileNameBuffer->FileName[0] == L'*')
|
||
|
||
&&
|
||
|
||
((FileNameBuffer->FileNameLength == 1) ||
|
||
|
||
((FileNameBuffer->FileNameLength == 3) &&
|
||
(FileNameBuffer->FileName[1] == L'.') &&
|
||
(FileNameBuffer->FileName[2] == L'*')));
|
||
|
||
while (TRUE) {
|
||
|
||
PINDEX_ENTRY IndexEntry;
|
||
PFILE_NAME NtfsFileName;
|
||
PDUPLICATED_INFORMATION DupInfo;
|
||
PFILE_NAME DosFileName;
|
||
FILE_REFERENCE FileId;
|
||
|
||
ULONG BytesRemainingInBuffer;
|
||
ULONG FoundFileNameLength;
|
||
|
||
struct {
|
||
|
||
FILE_NAME FileName;
|
||
WCHAR LastChar;
|
||
} DotDotName;
|
||
|
||
BOOLEAN SynchronizationError;
|
||
|
||
DebugTrace( 0, Dbg, ("Top of Loop\n") );
|
||
DebugTrace( 0, Dbg, ("LastEntry = %08lx\n", LastEntry) );
|
||
DebugTrace( 0, Dbg, ("NextEntry = %08lx\n", NextEntry) );
|
||
|
||
//
|
||
// If a previous pass through the loop acquired the Fcb table then
|
||
// release it now. We don't want to be holding it if we take a fault
|
||
// on the directory stream. Otherwise we can get into a circular
|
||
// deadlock if we need to acquire the mutex for this file while
|
||
// holding the mutex for the Fcb Table.
|
||
//
|
||
|
||
if (FlagOn( OtherContext.Flags, INDX_CTX_FLAG_FCB_TABLE_ACQUIRED )) {
|
||
NtfsReleaseFcbTable( IrpContext, IrpContext->Vcb );
|
||
ClearFlag( OtherContext.Flags, INDX_CTX_FLAG_FCB_TABLE_ACQUIRED );
|
||
}
|
||
DosFileName = NULL;
|
||
|
||
//
|
||
// Lookup the next index entry. Check if we need to do the lookup
|
||
// by calling restart or continue. If we do need to call restart
|
||
// check to see if we have a real AnsiFileName. And set ourselves
|
||
// up for subsequent iternations through the loop
|
||
//
|
||
|
||
if (CallRestart) {
|
||
|
||
GotEntry = NtfsRestartIndexEnumeration( IrpContext,
|
||
Ccb,
|
||
Scb,
|
||
(PVOID)FileNameBuffer,
|
||
IgnoreCase,
|
||
NextFlag,
|
||
&IndexEntry,
|
||
AcquiredFcb );
|
||
CallRestart = FALSE;
|
||
|
||
} else {
|
||
|
||
GotEntry = NtfsContinueIndexEnumeration( IrpContext,
|
||
Ccb,
|
||
Scb,
|
||
NextFlag,
|
||
&IndexEntry );
|
||
}
|
||
|
||
//
|
||
// Check to see if we should quit the loop because we are only
|
||
// returning a single entry. We actually want to spin around
|
||
// the loop top twice so that our enumeration has has us left off
|
||
// at the last entry we didn't return. We know this is now our
|
||
// second time though the loop if NextEntry is not zero.
|
||
//
|
||
|
||
if ((ReturnSingleEntry) && (NextEntry != 0)) {
|
||
|
||
break;
|
||
}
|
||
|
||
//
|
||
// Assume we won't be returning the file id.
|
||
//
|
||
|
||
*((PLONGLONG) &FileId) = 0;
|
||
|
||
//
|
||
// Assume we are to return one of the names "." or "..".
|
||
// We should not search farther in the index so we set
|
||
// NextFlag to FALSE.
|
||
//
|
||
|
||
RtlZeroMemory( &DotDotName, sizeof(DotDotName) );
|
||
NtfsFileName = &DotDotName.FileName;
|
||
NtfsFileName->Flags = FILE_NAME_NTFS | FILE_NAME_DOS;
|
||
NtfsFileName->FileName[0] =
|
||
NtfsFileName->FileName[1] = L'.';
|
||
DupInfo = &Scb->Fcb->Info;
|
||
NextFlag = FALSE;
|
||
|
||
//
|
||
// Handle "." first.
|
||
//
|
||
|
||
if (!FlagOn(Ccb->Flags, CCB_FLAG_DOT_RETURNED) &&
|
||
FlagOn(Ccb->Flags, CCB_FLAG_RETURN_DOT)) {
|
||
|
||
FoundFileNameLength = 2;
|
||
GotEntry = TRUE;
|
||
SetFlag( Ccb->Flags, CCB_FLAG_DOT_RETURNED );
|
||
|
||
FileId = Scb->Fcb->FileReference;
|
||
|
||
//
|
||
// Handle ".." next.
|
||
//
|
||
|
||
} else if (!FlagOn(Ccb->Flags, CCB_FLAG_DOTDOT_RETURNED) &&
|
||
FlagOn(Ccb->Flags, CCB_FLAG_RETURN_DOTDOT)) {
|
||
|
||
FoundFileNameLength = 4;
|
||
GotEntry = TRUE;
|
||
SetFlag( Ccb->Flags, CCB_FLAG_DOTDOT_RETURNED );
|
||
|
||
} else {
|
||
|
||
//
|
||
// Compute the length of the name we found.
|
||
//
|
||
|
||
if (GotEntry) {
|
||
|
||
FileId = IndexEntry->FileReference;
|
||
|
||
NtfsFileName = (PFILE_NAME)(IndexEntry + 1);
|
||
|
||
FoundFileNameLength = NtfsFileName->FileNameLength * sizeof( WCHAR );
|
||
|
||
//
|
||
// Verify the index entry is valid.
|
||
//
|
||
|
||
if (FoundFileNameLength != IndexEntry->AttributeLength - SizeOfFileName) {
|
||
|
||
NtfsRaiseStatus( IrpContext, STATUS_FILE_CORRUPT_ERROR, NULL, Scb->Fcb );
|
||
}
|
||
|
||
DupInfo = &NtfsFileName->Info;
|
||
NextFlag = TRUE;
|
||
|
||
//
|
||
// Don't return any system files.
|
||
//
|
||
|
||
if (NtfsSegmentNumber( &IndexEntry->FileReference ) < FIRST_USER_FILE_NUMBER &&
|
||
NtfsProtectSystemFiles) {
|
||
|
||
continue;
|
||
}
|
||
|
||
}
|
||
}
|
||
|
||
//
|
||
// Now check to see if we actually got another index entry. If
|
||
// we didn't then we also need to check if we never got any
|
||
// or if we just ran out. If we just ran out then we break out
|
||
// of the main loop and finish the Irp after the loop
|
||
//
|
||
|
||
if (!GotEntry) {
|
||
|
||
DebugTrace( 0, Dbg, ("GotEntry is FALSE\n") );
|
||
|
||
if (NextEntry == 0) {
|
||
|
||
if (FirstQuery) {
|
||
|
||
try_return( Status = STATUS_NO_SUCH_FILE );
|
||
}
|
||
|
||
try_return( Status = STATUS_NO_MORE_FILES );
|
||
}
|
||
|
||
break;
|
||
}
|
||
|
||
//
|
||
// Cleanup and reinitialize context from previous loop.
|
||
//
|
||
|
||
NtfsReinitializeIndexContext( IrpContext, &OtherContext );
|
||
|
||
//
|
||
// We may have matched a Dos-Only name. If so we will save
|
||
// it and go get the Ntfs name.
|
||
//
|
||
|
||
if (!FlagOn(NtfsFileName->Flags, FILE_NAME_NTFS) &&
|
||
FlagOn(NtfsFileName->Flags, FILE_NAME_DOS)) {
|
||
|
||
//
|
||
// If we are returning everything, then we can skip
|
||
// the Dos-Only names and save some cycles.
|
||
//
|
||
|
||
if (MatchAll) {
|
||
continue;
|
||
}
|
||
|
||
DosFileName = NtfsFileName;
|
||
|
||
NtfsFileName = NtfsRetrieveOtherFileName( IrpContext,
|
||
Ccb,
|
||
Scb,
|
||
IndexEntry,
|
||
&OtherContext,
|
||
AcquiredFcb,
|
||
&SynchronizationError );
|
||
|
||
//
|
||
// If we got an Ntfs name, then we need to list this entry now
|
||
// iff the Ntfs name is not in the expression. If the Ntfs
|
||
// name is in the expression, we can just continue and print
|
||
// this name when we encounter it by the Ntfs name.
|
||
//
|
||
|
||
if (NtfsFileName != NULL) {
|
||
|
||
if (FlagOn(Ccb->Flags, CCB_FLAG_WILDCARD_IN_EXPRESSION)) {
|
||
|
||
if (NtfsFileNameIsInExpression( Vcb->UpcaseTable,
|
||
(PFILE_NAME)Ccb->QueryBuffer,
|
||
NtfsFileName,
|
||
IgnoreCase )) {
|
||
|
||
continue;
|
||
}
|
||
|
||
} else {
|
||
|
||
if (NtfsFileNameIsEqual( Vcb->UpcaseTable,
|
||
(PFILE_NAME)Ccb->QueryBuffer,
|
||
NtfsFileName,
|
||
IgnoreCase )) {
|
||
|
||
continue;
|
||
}
|
||
}
|
||
|
||
FoundFileNameLength = NtfsFileName->FileNameLength * sizeof( WCHAR );
|
||
|
||
} else if (SynchronizationError) {
|
||
|
||
if (Irp->IoStatus.Information != 0) {
|
||
try_return( Status = STATUS_SUCCESS );
|
||
} else {
|
||
NtfsRaiseStatus( IrpContext, STATUS_CANT_WAIT, NULL, NULL );
|
||
}
|
||
|
||
} else {
|
||
|
||
continue;
|
||
}
|
||
}
|
||
|
||
//
|
||
// Here are the rules concerning filling up the buffer:
|
||
//
|
||
// 1. The Io system garentees that there will always be
|
||
// enough room for at least one base record.
|
||
//
|
||
// 2. If the full first record (including file name) cannot
|
||
// fit, as much of the name as possible is copied and
|
||
// STATUS_BUFFER_OVERFLOW is returned.
|
||
//
|
||
// 3. If a subsequent record cannot completely fit into the
|
||
// buffer, none of it (as in 0 bytes) is copied, and
|
||
// STATUS_SUCCESS is returned. A subsequent query will
|
||
// pick up with this record.
|
||
//
|
||
|
||
BytesRemainingInBuffer = UserBufferLength - NextEntry;
|
||
|
||
if ( (NextEntry != 0) &&
|
||
( (BaseLength + FoundFileNameLength > BytesRemainingInBuffer) ||
|
||
(UserBufferLength < NextEntry) ) ) {
|
||
|
||
DebugTrace( 0, Dbg, ("Next entry won't fit\n") );
|
||
|
||
try_return( Status = STATUS_SUCCESS );
|
||
}
|
||
|
||
ASSERT( BytesRemainingInBuffer >= BaseLength );
|
||
|
||
//
|
||
// Zero the base part of the structure.
|
||
//
|
||
|
||
AccessingUserBuffer = TRUE;
|
||
RtlZeroMemory( &Buffer[NextEntry], BaseLength );
|
||
AccessingUserBuffer = FALSE;
|
||
|
||
//
|
||
// Now we have an entry to return to our caller. we'll
|
||
// case on the type of information requested and fill up the
|
||
// user buffer if everything fits
|
||
//
|
||
|
||
switch (FileInformationClass) {
|
||
|
||
case FileIdFullDirectoryInformation:
|
||
|
||
((PFILE_ID_FULL_DIR_INFORMATION)&Buffer[NextEntry])->FileId.QuadPart = *((PLONGLONG) &FileId);
|
||
goto FillFullDirectoryInformation;
|
||
|
||
case FileIdBothDirectoryInformation:
|
||
|
||
((PFILE_ID_BOTH_DIR_INFORMATION)&Buffer[NextEntry])->FileId.QuadPart = *((PLONGLONG) &FileId);
|
||
// Fall thru
|
||
|
||
case FileBothDirectoryInformation:
|
||
|
||
BothDirInfo = (PFILE_BOTH_DIR_INFORMATION)&Buffer[NextEntry];
|
||
|
||
//
|
||
// If this is not also a Dos name, and the Ntfs flag is set
|
||
// (meaning there is a separate Dos name), then call the
|
||
// routine to get the short name, if we do not already have
|
||
// it from above.
|
||
//
|
||
|
||
if (!FlagOn(NtfsFileName->Flags, FILE_NAME_DOS) &&
|
||
FlagOn(NtfsFileName->Flags, FILE_NAME_NTFS)) {
|
||
|
||
if (DosFileName == NULL) {
|
||
|
||
DosFileName = NtfsRetrieveOtherFileName( IrpContext,
|
||
Ccb,
|
||
Scb,
|
||
IndexEntry,
|
||
&OtherContext,
|
||
AcquiredFcb,
|
||
&SynchronizationError );
|
||
}
|
||
|
||
if (DosFileName != NULL) {
|
||
|
||
AccessingUserBuffer = TRUE;
|
||
BothDirInfo->ShortNameLength = DosFileName->FileNameLength * sizeof( WCHAR );
|
||
RtlCopyMemory( BothDirInfo->ShortName,
|
||
DosFileName->FileName,
|
||
BothDirInfo->ShortNameLength );
|
||
} else if (SynchronizationError) {
|
||
|
||
if (Irp->IoStatus.Information != 0) {
|
||
try_return( Status = STATUS_SUCCESS );
|
||
} else {
|
||
NtfsRaiseStatus( IrpContext, STATUS_CANT_WAIT, NULL, NULL );
|
||
}
|
||
}
|
||
}
|
||
|
||
// Fallthru
|
||
|
||
case FileFullDirectoryInformation:
|
||
|
||
FillFullDirectoryInformation:
|
||
|
||
DebugTrace( 0, Dbg, ("Getting file full Unicode directory information\n") );
|
||
|
||
FullDirInfo = (PFILE_FULL_DIR_INFORMATION)&Buffer[NextEntry];
|
||
|
||
//
|
||
// EAs and reparse points cannot both be in a file at the same
|
||
// time. We return different information for each case.
|
||
//
|
||
|
||
AccessingUserBuffer = TRUE;
|
||
if (FlagOn( DupInfo->FileAttributes, FILE_ATTRIBUTE_REPARSE_POINT)) {
|
||
|
||
FullDirInfo->EaSize = DupInfo->ReparsePointTag;
|
||
} else {
|
||
|
||
FullDirInfo->EaSize = DupInfo->PackedEaSize;
|
||
|
||
//
|
||
// Add 4 bytes for the CbListHeader.
|
||
//
|
||
|
||
if (DupInfo->PackedEaSize != 0) {
|
||
|
||
FullDirInfo->EaSize += 4;
|
||
}
|
||
}
|
||
|
||
// Fallthru
|
||
|
||
case FileDirectoryInformation:
|
||
|
||
DebugTrace( 0, Dbg, ("Getting file Unicode directory information\n") );
|
||
|
||
DirInfo = (PFILE_DIRECTORY_INFORMATION)&Buffer[NextEntry];
|
||
|
||
AccessingUserBuffer = TRUE;
|
||
DirInfo->CreationTime.QuadPart = DupInfo->CreationTime;
|
||
DirInfo->LastAccessTime.QuadPart = DupInfo->LastAccessTime;
|
||
DirInfo->LastWriteTime.QuadPart = DupInfo->LastModificationTime;
|
||
DirInfo->ChangeTime.QuadPart = DupInfo->LastChangeTime;
|
||
|
||
DirInfo->FileAttributes = DupInfo->FileAttributes & FILE_ATTRIBUTE_VALID_FLAGS;
|
||
|
||
if (IsDirectory( DupInfo ) || IsViewIndex( DupInfo )) {
|
||
DirInfo->FileAttributes |= FILE_ATTRIBUTE_DIRECTORY;
|
||
}
|
||
if (DirInfo->FileAttributes == 0) {
|
||
DirInfo->FileAttributes = FILE_ATTRIBUTE_NORMAL;
|
||
}
|
||
|
||
DirInfo->FileNameLength = FoundFileNameLength;
|
||
|
||
DirInfo->EndOfFile.QuadPart = DupInfo->FileSize;
|
||
DirInfo->AllocationSize.QuadPart = DupInfo->AllocatedLength;
|
||
|
||
break;
|
||
|
||
case FileNamesInformation:
|
||
|
||
DebugTrace( 0, Dbg, ("Getting file Unicode names information\n") );
|
||
|
||
AccessingUserBuffer = TRUE;
|
||
NamesInfo = (PFILE_NAMES_INFORMATION)&Buffer[NextEntry];
|
||
|
||
NamesInfo->FileNameLength = FoundFileNameLength;
|
||
|
||
break;
|
||
|
||
default:
|
||
|
||
try_return( Status = STATUS_INVALID_INFO_CLASS );
|
||
}
|
||
|
||
//
|
||
// Compute how many bytes we can copy. This should only be less
|
||
// than the file name length if we are only returning a single
|
||
// entry.
|
||
//
|
||
|
||
if (BytesRemainingInBuffer >= BaseLength + FoundFileNameLength) {
|
||
|
||
BytesToCopy = FoundFileNameLength;
|
||
|
||
} else {
|
||
|
||
BytesToCopy = BytesRemainingInBuffer - BaseLength;
|
||
|
||
Status = STATUS_BUFFER_OVERFLOW;
|
||
}
|
||
|
||
ASSERT( AccessingUserBuffer );
|
||
RtlCopyMemory( &Buffer[NextEntry + BaseLength],
|
||
NtfsFileName->FileName,
|
||
BytesToCopy );
|
||
|
||
//
|
||
// If/when we actually emit a record for the Fcb acquired,
|
||
// then we can release that file now. Note we do not just
|
||
// do it on the first time through the loop, because some of
|
||
// our callers back up a bit when they give us the resume point.
|
||
//
|
||
|
||
if ((AcquiredFcb != NULL) &&
|
||
(DupInfo != &Scb->Fcb->Info) &&
|
||
NtfsEqualMftRef(&IndexEntry->FileReference, &Ccb->FcbToAcquire.FileReference)) {
|
||
|
||
//
|
||
// Now look up the Fcb, and if it is there, reference it
|
||
// and remember it.
|
||
//
|
||
// It is pretty inconvenient here to see if the ReferenceCount
|
||
// goes to zero and try to do a TearDown, we do not have the
|
||
// right resources. Note that the window is small, and the Fcb
|
||
// will go away if either someone opens the file again, someone
|
||
// tries to delete the directory, or someone tries to lock the
|
||
// volume.
|
||
//
|
||
|
||
NtfsAcquireFcbTable( IrpContext, Vcb );
|
||
AcquiredFcb->ReferenceCount -= 1;
|
||
NtfsReleaseFcbTable( IrpContext, Vcb );
|
||
NtfsReleaseFcb( IrpContext, AcquiredFcb );
|
||
AcquiredFcb = NULL;
|
||
}
|
||
|
||
//
|
||
// Set up the previous next entry offset
|
||
//
|
||
|
||
*((PULONG)(&Buffer[LastEntry])) = NextEntry - LastEntry;
|
||
AccessingUserBuffer = FALSE;
|
||
|
||
//
|
||
// And indicate how much of the user buffer we have currently
|
||
// used up. We must compute this value before we long align
|
||
// ourselves for the next entry. This is the point where we
|
||
// quad-align the length of the previous entry.
|
||
//
|
||
|
||
Irp->IoStatus.Information = QuadAlign( Irp->IoStatus.Information) +
|
||
BaseLength + BytesToCopy;
|
||
|
||
//
|
||
// If we weren't able to copy the whole name, then we bail here.
|
||
//
|
||
|
||
if ( !NT_SUCCESS( Status ) ) {
|
||
|
||
try_return( Status );
|
||
}
|
||
|
||
//
|
||
// Set ourselves up for the next iteration
|
||
//
|
||
|
||
LastEntry = NextEntry;
|
||
NextEntry += (ULONG)QuadAlign( BaseLength + BytesToCopy );
|
||
}
|
||
|
||
//
|
||
// At this point we've successfully filled up some of the buffer so
|
||
// now is the time to set our status to success.
|
||
//
|
||
|
||
Status = STATUS_SUCCESS;
|
||
|
||
} except( (!FsRtlIsNtstatusExpected( GetExceptionCode() ) && AccessingUserBuffer) ? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH ) {
|
||
|
||
NtfsRaiseStatus( IrpContext, STATUS_INVALID_USER_BUFFER, NULL, NULL );
|
||
}
|
||
|
||
try_exit:
|
||
|
||
//
|
||
// Abort transaction on error by raising.
|
||
//
|
||
|
||
NtfsCleanupTransaction( IrpContext, Status, FALSE );
|
||
|
||
//
|
||
// Set the last access flag in the Fcb if the caller
|
||
// didn't set it explicitly.
|
||
//
|
||
|
||
if (!FlagOn( Ccb->Flags, CCB_FLAG_USER_SET_LAST_ACCESS_TIME ) &&
|
||
!FlagOn( NtfsData.Flags, NTFS_FLAGS_DISABLE_LAST_ACCESS )) {
|
||
|
||
NtfsGetCurrentTime( IrpContext, Scb->Fcb->CurrentLastAccess );
|
||
SetFlag( Scb->Fcb->InfoFlags, FCB_INFO_UPDATE_LAST_ACCESS );
|
||
}
|
||
|
||
} finally {
|
||
|
||
DebugUnwind( NtfsQueryDirectory );
|
||
|
||
if (VcbAcquired) {
|
||
NtfsReleaseVcb( IrpContext, Vcb );
|
||
}
|
||
|
||
NtfsCleanupIndexContext( IrpContext, &OtherContext );
|
||
|
||
if (AcquiredFcb != NULL) {
|
||
|
||
//
|
||
// Now look up the Fcb, and if it is there, reference it
|
||
// and remember it.
|
||
//
|
||
// It is pretty inconvenient here to see if the ReferenceCount
|
||
// goes to zero and try to do a TearDown, we do not have the
|
||
// right resources. Note that the window is small, and the Fcb
|
||
// will go away if either someone opens the file again, someone
|
||
// tries to delete the directory, or someone tries to lock the
|
||
// volume.
|
||
//
|
||
|
||
NtfsAcquireFcbTable( IrpContext, Vcb );
|
||
AcquiredFcb->ReferenceCount -= 1;
|
||
NtfsReleaseFcbTable( IrpContext, Vcb );
|
||
NtfsReleaseFcb( IrpContext, AcquiredFcb );
|
||
}
|
||
|
||
if (ScbAcquired) {
|
||
NtfsReleaseScb( IrpContext, Scb );
|
||
}
|
||
|
||
NtfsCleanupAfterEnumeration( IrpContext, Ccb );
|
||
|
||
if (CcbAcquired) {
|
||
|
||
NtfsReleaseIndexCcb( Scb, Ccb );
|
||
}
|
||
|
||
if (!AbnormalTermination()) {
|
||
|
||
NtfsCompleteRequest( IrpContext, Irp, Status );
|
||
}
|
||
|
||
if (UnwindFileNameBuffer != NULL) {
|
||
|
||
NtfsFreePool(UnwindFileNameBuffer);
|
||
}
|
||
}
|
||
|
||
//
|
||
// And return to our caller
|
||
//
|
||
|
||
DebugTrace( -1, Dbg, ("NtfsQueryDirectory -> %08lx\n", Status) );
|
||
|
||
return Status;
|
||
}
|
||
|
||
|
||
//
|
||
// Local Support Routine
|
||
//
|
||
|
||
NTSTATUS
|
||
NtfsNotifyChangeDirectory (
|
||
IN PIRP_CONTEXT IrpContext,
|
||
IN PIRP Irp,
|
||
IN PVCB Vcb,
|
||
IN PSCB Scb,
|
||
IN PCCB Ccb
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine performs the notify change directory operation. It is
|
||
responsible for either completing or enqueuing the input Irp.
|
||
|
||
Arguments:
|
||
|
||
Irp - Supplies the Irp to process
|
||
|
||
Vcb - Supplies its Vcb
|
||
|
||
Scb - Supplies its Scb
|
||
|
||
Ccb - Supplies its Ccb
|
||
|
||
Return Value:
|
||
|
||
NTSTATUS - The return status for the operation
|
||
|
||
--*/
|
||
|
||
{
|
||
NTSTATUS Status;
|
||
PIO_STACK_LOCATION IrpSp;
|
||
|
||
ULONG CompletionFilter;
|
||
BOOLEAN WatchTree;
|
||
BOOLEAN ViewIndex;
|
||
|
||
PSECURITY_SUBJECT_CONTEXT SubjectContext = NULL;
|
||
BOOLEAN FreeSubjectContext = FALSE;
|
||
|
||
PCHECK_FOR_TRAVERSE_ACCESS CallBack = NULL;
|
||
|
||
ASSERT_IRP_CONTEXT( IrpContext );
|
||
ASSERT_IRP( Irp );
|
||
ASSERT_VCB( Vcb );
|
||
ASSERT_CCB( Ccb );
|
||
ASSERT_SCB( Scb );
|
||
|
||
PAGED_CODE();
|
||
|
||
//
|
||
// Get the current Stack location
|
||
//
|
||
|
||
IrpSp = IoGetCurrentIrpStackLocation( Irp );
|
||
|
||
DebugTrace( +1, Dbg, ("NtfsNotifyChangeDirectory...\n") );
|
||
DebugTrace( 0, Dbg, ("IrpContext = %08lx\n", IrpContext) );
|
||
DebugTrace( 0, Dbg, ("Irp = %08lx\n", Irp) );
|
||
DebugTrace( 0, Dbg, (" ->CompletionFilter = %08lx\n", IrpSp->Parameters.NotifyDirectory.CompletionFilter) );
|
||
DebugTrace( 0, Dbg, (" ->WatchTree = %08lx\n", FlagOn( IrpSp->Flags, SL_WATCH_TREE )) );
|
||
DebugTrace( 0, Dbg, ("Vcb = %08lx\n", Vcb) );
|
||
DebugTrace( 0, Dbg, ("Ccb = %08lx\n", Ccb) );
|
||
DebugTrace( 0, Dbg, ("Scb = %08lx\n", Scb) );
|
||
|
||
//
|
||
// Reference our input parameter to make things easier
|
||
//
|
||
|
||
CompletionFilter = IrpSp->Parameters.NotifyDirectory.CompletionFilter;
|
||
WatchTree = BooleanFlagOn( IrpSp->Flags, SL_WATCH_TREE );
|
||
|
||
//
|
||
// Always set the wait bit in the IrpContext so the initial wait can't fail.
|
||
//
|
||
|
||
SetFlag( IrpContext->State, IRP_CONTEXT_STATE_WAIT );
|
||
|
||
//
|
||
// We will only acquire the Vcb to perform the dirnotify task. The dirnotify
|
||
// package will provide synchronization between this operation and cleanup.
|
||
// We need the Vcb to synchronize with any rename or link operations underway.
|
||
//
|
||
|
||
NtfsAcquireSharedVcb( IrpContext, Vcb, TRUE );
|
||
|
||
try {
|
||
|
||
//
|
||
// If the Link count is zero on this Fcb then complete this request
|
||
// with STATUS_DELETE_PENDING.
|
||
//
|
||
|
||
if (Scb->Fcb->LinkCount == 0) {
|
||
|
||
NtfsRaiseStatus( IrpContext, STATUS_DELETE_PENDING, NULL, NULL );
|
||
}
|
||
|
||
ViewIndex = BooleanFlagOn( Scb->ScbState, SCB_STATE_VIEW_INDEX );
|
||
|
||
//
|
||
// If we need to verify traverse access for this caller then allocate and
|
||
// capture the subject context to pass to the dir notify package. That
|
||
// package will be responsible for deallocating it.
|
||
//
|
||
|
||
if (FlagOn( Ccb->Flags, CCB_FLAG_TRAVERSE_CHECK )) {
|
||
|
||
//
|
||
// We only use the subject context for directories
|
||
//
|
||
|
||
if (!ViewIndex) {
|
||
SubjectContext = NtfsAllocatePool( PagedPool,
|
||
sizeof( SECURITY_SUBJECT_CONTEXT ));
|
||
|
||
FreeSubjectContext = TRUE;
|
||
SeCaptureSubjectContext( SubjectContext );
|
||
|
||
FreeSubjectContext = FALSE;
|
||
}
|
||
CallBack = NtfsNotifyTraverseCheck;
|
||
}
|
||
|
||
//
|
||
// 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.
|
||
//
|
||
|
||
if (ViewIndex) {
|
||
|
||
//
|
||
// View indices use different values for the overloaded inputs
|
||
// to FsRtlNotifyFilterChangeDirectory.
|
||
//
|
||
|
||
FsRtlNotifyFilterChangeDirectory( Vcb->NotifySync,
|
||
&Vcb->ViewIndexNotifyList,
|
||
Ccb,
|
||
NULL,
|
||
WatchTree,
|
||
FALSE,
|
||
CompletionFilter,
|
||
Irp,
|
||
CallBack,
|
||
(PSECURITY_SUBJECT_CONTEXT) Scb->Fcb,
|
||
NULL );
|
||
} else {
|
||
|
||
FsRtlNotifyFilterChangeDirectory( Vcb->NotifySync,
|
||
&Vcb->DirNotifyList,
|
||
Ccb,
|
||
(PSTRING) &Scb->ScbType.Index.NormalizedName,
|
||
WatchTree,
|
||
FALSE,
|
||
CompletionFilter,
|
||
Irp,
|
||
CallBack,
|
||
SubjectContext,
|
||
NULL );
|
||
}
|
||
|
||
Status = STATUS_PENDING;
|
||
|
||
if (!FlagOn( Ccb->Flags, CCB_FLAG_DIR_NOTIFY )) {
|
||
|
||
SetFlag( Ccb->Flags, CCB_FLAG_DIR_NOTIFY );
|
||
|
||
if (ViewIndex) {
|
||
|
||
InterlockedIncrement( &Vcb->ViewIndexNotifyCount );
|
||
|
||
} else {
|
||
|
||
InterlockedIncrement( &Vcb->NotifyCount );
|
||
}
|
||
}
|
||
|
||
} finally {
|
||
|
||
DebugUnwind( NtfsNotifyChangeDirectory );
|
||
|
||
NtfsReleaseVcb( IrpContext, Vcb );
|
||
|
||
//
|
||
// Since the dir notify package is holding the Irp, we discard the
|
||
// the IrpContext.
|
||
//
|
||
|
||
if (!AbnormalTermination()) {
|
||
|
||
NtfsCompleteRequest( IrpContext, NULL, 0 );
|
||
|
||
} else if (FreeSubjectContext) {
|
||
|
||
NtfsFreePool( SubjectContext );
|
||
}
|
||
}
|
||
|
||
//
|
||
// And return to our caller
|
||
//
|
||
|
||
DebugTrace( -1, Dbg, ("NtfsNotifyChangeDirectory -> %08lx\n", Status) );
|
||
|
||
return Status;
|
||
}
|
||
|