1529 lines
44 KiB
C
1529 lines
44 KiB
C
/*++
|
||
|
||
Copyright (c) 1989-2000 Microsoft Corporation
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|
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Module Name:
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||
|
||
DirCtrl.c
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||
|
||
Abstract:
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|
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This module implements the File Directory Control routines for Cdfs called
|
||
by the Fsd/Fsp dispatch drivers.
|
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|
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// @@BEGIN_DDKSPLIT
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|
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Author:
|
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|
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Brian Andrew [BrianAn] 01-July-1995
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|
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Revision History:
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|
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// @@END_DDKSPLIT
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|
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--*/
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|
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#include "CdProcs.h"
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//
|
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// The Bug check file id for this module
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//
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#define BugCheckFileId (CDFS_BUG_CHECK_DIRCTRL)
|
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|
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//
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// Local support routines
|
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//
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|
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NTSTATUS
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CdQueryDirectory (
|
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IN PIRP_CONTEXT IrpContext,
|
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IN PIRP Irp,
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IN PIO_STACK_LOCATION IrpSp,
|
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IN PFCB Fcb,
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IN PCCB Ccb
|
||
);
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NTSTATUS
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CdNotifyChangeDirectory (
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IN PIRP_CONTEXT IrpContext,
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IN PIRP Irp,
|
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IN PIO_STACK_LOCATION IrpSp,
|
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IN PCCB Ccb
|
||
);
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|
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VOID
|
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CdInitializeEnumeration (
|
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IN PIRP_CONTEXT IrpContext,
|
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IN PIO_STACK_LOCATION IrpSp,
|
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IN PFCB Fcb,
|
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IN OUT PCCB Ccb,
|
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IN OUT PFILE_ENUM_CONTEXT FileContext,
|
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OUT PBOOLEAN ReturnNextEntry,
|
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OUT PBOOLEAN ReturnSingleEntry,
|
||
OUT PBOOLEAN InitialQuery
|
||
);
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BOOLEAN
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CdEnumerateIndex (
|
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IN PIRP_CONTEXT IrpContext,
|
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IN PCCB Ccb,
|
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IN OUT PFILE_ENUM_CONTEXT FileContext,
|
||
IN BOOLEAN ReturnNextEntry
|
||
);
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||
|
||
#ifdef ALLOC_PRAGMA
|
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#pragma alloc_text(PAGE, CdCommonDirControl)
|
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#pragma alloc_text(PAGE, CdEnumerateIndex)
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#pragma alloc_text(PAGE, CdInitializeEnumeration)
|
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#pragma alloc_text(PAGE, CdNotifyChangeDirectory)
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#pragma alloc_text(PAGE, CdQueryDirectory)
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#endif
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NTSTATUS
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CdCommonDirControl (
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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 routine is the entry point for the directory control operations. These
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are directory enumerations and directory notify calls. We verify the
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user's handle is for a directory and then call the appropriate routine.
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Arguments:
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Irp - Irp for this request.
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Return Value:
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NTSTATUS - Status returned from the lower level routines.
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--*/
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{
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NTSTATUS Status;
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PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation( Irp );
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PFCB Fcb;
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PCCB Ccb;
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PAGED_CODE();
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//
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// Decode the user file object and fail this request if it is not
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// a user directory.
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//
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if (CdDecodeFileObject( IrpContext,
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IrpSp->FileObject,
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&Fcb,
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&Ccb ) != UserDirectoryOpen) {
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CdCompleteRequest( IrpContext, Irp, STATUS_INVALID_PARAMETER );
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return STATUS_INVALID_PARAMETER;
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}
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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 a 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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Status = CdQueryDirectory( IrpContext, Irp, IrpSp, Fcb, Ccb );
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break;
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case IRP_MN_NOTIFY_CHANGE_DIRECTORY:
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Status = CdNotifyChangeDirectory( IrpContext, Irp, IrpSp, Ccb );
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break;
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default:
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CdCompleteRequest( 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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return Status;
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}
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//
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// Local support routines
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//
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NTSTATUS
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CdQueryDirectory (
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IN PIRP_CONTEXT IrpContext,
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IN PIRP Irp,
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IN PIO_STACK_LOCATION IrpSp,
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IN PFCB Fcb,
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IN PCCB Ccb
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)
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/*++
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Routine Description:
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This routine performs the query directory operation. It is responsible
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for either completing of enqueuing the input Irp. We store the state of the
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search in the Ccb.
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Arguments:
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Irp - Supplies the Irp to process
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IrpSp - Stack location for this Irp.
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Fcb - Fcb for this directory.
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Ccb - Ccb for this directory open.
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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 = STATUS_SUCCESS;
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ULONG Information = 0;
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ULONG LastEntry = 0;
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ULONG NextEntry = 0;
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ULONG FileNameBytes;
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ULONG SeparatorBytes;
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ULONG VersionStringBytes;
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FILE_ENUM_CONTEXT FileContext;
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PDIRENT ThisDirent;
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BOOLEAN InitialQuery;
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BOOLEAN ReturnNextEntry;
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BOOLEAN ReturnSingleEntry;
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BOOLEAN Found;
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BOOLEAN DoCcbUpdate = FALSE;
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PCHAR UserBuffer;
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ULONG BytesRemainingInBuffer;
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ULONG BaseLength;
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PFILE_BOTH_DIR_INFORMATION DirInfo;
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PFILE_NAMES_INFORMATION NamesInfo;
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PFILE_ID_FULL_DIR_INFORMATION IdFullDirInfo;
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PFILE_ID_BOTH_DIR_INFORMATION IdBothDirInfo;
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PAGED_CODE();
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//
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// Check if we support this search mode. Also remember the size of the base part of
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// each of these structures.
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//
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switch (IrpSp->Parameters.QueryDirectory.FileInformationClass) {
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case FileDirectoryInformation:
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BaseLength = FIELD_OFFSET( FILE_DIRECTORY_INFORMATION,
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FileName[0] );
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break;
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case FileFullDirectoryInformation:
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BaseLength = FIELD_OFFSET( FILE_FULL_DIR_INFORMATION,
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FileName[0] );
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break;
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case FileIdFullDirectoryInformation:
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BaseLength = FIELD_OFFSET( FILE_ID_FULL_DIR_INFORMATION,
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FileName[0] );
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break;
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case FileNamesInformation:
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BaseLength = FIELD_OFFSET( FILE_NAMES_INFORMATION,
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FileName[0] );
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break;
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case FileBothDirectoryInformation:
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BaseLength = FIELD_OFFSET( FILE_BOTH_DIR_INFORMATION,
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FileName[0] );
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break;
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case FileIdBothDirectoryInformation:
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BaseLength = FIELD_OFFSET( FILE_ID_BOTH_DIR_INFORMATION,
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FileName[0] );
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break;
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default:
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CdCompleteRequest( IrpContext, Irp, STATUS_INVALID_INFO_CLASS );
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return STATUS_INVALID_INFO_CLASS;
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}
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//
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// Get the user buffer.
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//
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CdMapUserBuffer( IrpContext, &UserBuffer);
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//
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// Initialize our search context.
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//
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CdInitializeFileContext( IrpContext, &FileContext );
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//
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// Acquire the directory.
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//
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CdAcquireFileShared( IrpContext, Fcb );
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//
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// Use a try-finally to facilitate cleanup.
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//
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try {
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//
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// Verify the Fcb is still good.
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//
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CdVerifyFcbOperation( IrpContext, Fcb );
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//
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// Start by getting the initial state for the enumeration. This will set up the Ccb with
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// the initial search parameters and let us know the starting offset in the directory
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// to search.
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//
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CdInitializeEnumeration( IrpContext,
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IrpSp,
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Fcb,
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Ccb,
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&FileContext,
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&ReturnNextEntry,
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&ReturnSingleEntry,
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&InitialQuery );
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//
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// The current dirent is stored in the InitialDirent field. We capture
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// this here so that we have a valid restart point even if we don't
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// find a single entry.
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//
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ThisDirent = &FileContext.InitialDirent->Dirent;
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||
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//
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// At this point we are about to enter our query loop. We have
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// determined the index into the directory file to begin the
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// search. LastEntry and NextEntry are used to index into the user
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// buffer. LastEntry is the last entry we've added, NextEntry is
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// current one we're working on. If NextEntry is non-zero, then
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// at least one entry was added.
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//
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while (TRUE) {
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||
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//
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// If the user had requested only a single match and we have
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// returned that, then we stop at this point. We update the Ccb with
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// the status based on the last entry returned.
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||
//
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||
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||
if ((NextEntry != 0) && ReturnSingleEntry) {
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||
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DoCcbUpdate = TRUE;
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||
try_leave( Status );
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}
|
||
|
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//
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// We try to locate the next matching dirent. Our search if based on a starting
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// dirent offset, whether we should return the current or next entry, whether
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// we should be doing a short name search and finally whether we should be
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// checking for a version match.
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//
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Found = CdEnumerateIndex( IrpContext, Ccb, &FileContext, ReturnNextEntry );
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//
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// Initialize the value for the next search.
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//
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ReturnNextEntry = TRUE;
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//
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// If we didn't receive a dirent, then we are at the end of the
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// directory. If we have returned any files, we exit with
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// success, otherwise we return STATUS_NO_MORE_FILES.
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//
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if (!Found) {
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||
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if (NextEntry == 0) {
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Status = STATUS_NO_MORE_FILES;
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if (InitialQuery) {
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Status = STATUS_NO_SUCH_FILE;
|
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}
|
||
}
|
||
|
||
DoCcbUpdate = TRUE;
|
||
try_leave( Status );
|
||
}
|
||
|
||
//
|
||
// Remember the dirent for the file we just found.
|
||
//
|
||
|
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ThisDirent = &FileContext.InitialDirent->Dirent;
|
||
|
||
//
|
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// 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
|
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// 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.
|
||
//
|
||
|
||
//
|
||
// Let's compute the number of bytes we need to transfer the current entry.
|
||
//
|
||
|
||
SeparatorBytes =
|
||
VersionStringBytes = 0;
|
||
|
||
//
|
||
// We can look directly at the dirent that we found.
|
||
//
|
||
|
||
FileNameBytes = ThisDirent->CdFileName.FileName.Length;
|
||
|
||
//
|
||
// Compute the number of bytes for the version string if
|
||
// we will return this. Allow directories with illegal ";".
|
||
//
|
||
|
||
if (((Ccb->SearchExpression.VersionString.Length != 0) ||
|
||
(FlagOn(ThisDirent->DirentFlags, CD_ATTRIBUTE_DIRECTORY))) &&
|
||
(ThisDirent->CdFileName.VersionString.Length != 0)) {
|
||
|
||
SeparatorBytes = 2;
|
||
|
||
VersionStringBytes = ThisDirent->CdFileName.VersionString.Length;
|
||
}
|
||
|
||
//
|
||
// If the slot for the next entry would be beyond the length of the
|
||
// user's buffer just exit (we know we've returned at least one entry
|
||
// already). This will happen when we align the pointer past the end.
|
||
//
|
||
|
||
if (NextEntry > IrpSp->Parameters.QueryDirectory.Length) {
|
||
|
||
ReturnNextEntry = FALSE;
|
||
DoCcbUpdate = TRUE;
|
||
try_leave( Status = STATUS_SUCCESS );
|
||
}
|
||
|
||
//
|
||
// Compute the number of bytes remaining in the buffer. Round this
|
||
// down to a WCHAR boundary so we can copy full characters.
|
||
//
|
||
|
||
BytesRemainingInBuffer = IrpSp->Parameters.QueryDirectory.Length - NextEntry;
|
||
ClearFlag( BytesRemainingInBuffer, 1 );
|
||
|
||
//
|
||
// If this won't fit and we have returned a previous entry then just
|
||
// return STATUS_SUCCESS.
|
||
//
|
||
|
||
if ((BaseLength + FileNameBytes + SeparatorBytes + VersionStringBytes) > BytesRemainingInBuffer) {
|
||
|
||
//
|
||
// If we already found an entry then just exit.
|
||
//
|
||
|
||
if (NextEntry != 0) {
|
||
|
||
ReturnNextEntry = FALSE;
|
||
DoCcbUpdate = TRUE;
|
||
try_leave( Status = STATUS_SUCCESS );
|
||
}
|
||
|
||
//
|
||
// Don't even try to return the version string if it doesn't all fit.
|
||
// Reduce the FileNameBytes to just fit in the buffer.
|
||
//
|
||
|
||
if ((BaseLength + FileNameBytes) > BytesRemainingInBuffer) {
|
||
|
||
FileNameBytes = BytesRemainingInBuffer - BaseLength;
|
||
}
|
||
|
||
//
|
||
// Don't return any version string bytes.
|
||
//
|
||
|
||
VersionStringBytes =
|
||
SeparatorBytes = 0;
|
||
|
||
//
|
||
// Use a status code of STATUS_BUFFER_OVERFLOW. Also set
|
||
// ReturnSingleEntry so that we will exit the loop at the top.
|
||
//
|
||
|
||
Status = STATUS_BUFFER_OVERFLOW;
|
||
ReturnSingleEntry = TRUE;
|
||
}
|
||
|
||
//
|
||
// Protect access to the user buffer with an exception handler.
|
||
// Since (at our request) IO doesn't buffer these requests, we have
|
||
// to guard against a user messing with the page protection and other
|
||
// such trickery.
|
||
//
|
||
|
||
try {
|
||
|
||
//
|
||
// Zero and initialize the base part of the current entry.
|
||
//
|
||
|
||
RtlZeroMemory( Add2Ptr( UserBuffer, NextEntry, PVOID ),
|
||
BaseLength );
|
||
|
||
//
|
||
// 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 (IrpSp->Parameters.QueryDirectory.FileInformationClass) {
|
||
|
||
case FileBothDirectoryInformation:
|
||
case FileFullDirectoryInformation:
|
||
case FileIdBothDirectoryInformation:
|
||
case FileIdFullDirectoryInformation:
|
||
case FileDirectoryInformation:
|
||
|
||
DirInfo = Add2Ptr( UserBuffer, NextEntry, PFILE_BOTH_DIR_INFORMATION );
|
||
|
||
//
|
||
// Use the create time for all the time stamps.
|
||
//
|
||
|
||
CdConvertCdTimeToNtTime( IrpContext,
|
||
FileContext.InitialDirent->Dirent.CdTime,
|
||
&DirInfo->CreationTime );
|
||
|
||
DirInfo->LastWriteTime = DirInfo->ChangeTime = DirInfo->CreationTime;
|
||
|
||
//
|
||
// Set the attributes and sizes separately for directories and
|
||
// files.
|
||
//
|
||
|
||
if (FlagOn( ThisDirent->DirentFlags, CD_ATTRIBUTE_DIRECTORY )) {
|
||
|
||
DirInfo->EndOfFile.QuadPart = DirInfo->AllocationSize.QuadPart = 0;
|
||
|
||
SetFlag( DirInfo->FileAttributes, FILE_ATTRIBUTE_DIRECTORY );
|
||
|
||
} else {
|
||
|
||
DirInfo->EndOfFile.QuadPart = FileContext.FileSize;
|
||
DirInfo->AllocationSize.QuadPart = LlSectorAlign( FileContext.FileSize );
|
||
}
|
||
|
||
//
|
||
// All Cdrom files are readonly. We also copy the existence
|
||
// bit to the hidden attribute.
|
||
//
|
||
|
||
SetFlag( DirInfo->FileAttributes, FILE_ATTRIBUTE_READONLY );
|
||
|
||
if (FlagOn( ThisDirent->DirentFlags,
|
||
CD_ATTRIBUTE_HIDDEN )) {
|
||
|
||
SetFlag( DirInfo->FileAttributes, FILE_ATTRIBUTE_HIDDEN );
|
||
}
|
||
|
||
DirInfo->FileIndex = ThisDirent->DirentOffset;
|
||
|
||
DirInfo->FileNameLength = FileNameBytes + SeparatorBytes + VersionStringBytes;
|
||
|
||
break;
|
||
|
||
case FileNamesInformation:
|
||
|
||
NamesInfo = Add2Ptr( UserBuffer, NextEntry, PFILE_NAMES_INFORMATION );
|
||
|
||
NamesInfo->FileIndex = ThisDirent->DirentOffset;
|
||
|
||
NamesInfo->FileNameLength = FileNameBytes + SeparatorBytes + VersionStringBytes;
|
||
|
||
break;
|
||
}
|
||
|
||
//
|
||
// Fill in the FileId
|
||
//
|
||
|
||
switch (IrpSp->Parameters.QueryDirectory.FileInformationClass) {
|
||
|
||
case FileIdBothDirectoryInformation:
|
||
|
||
IdBothDirInfo = Add2Ptr( UserBuffer, NextEntry, PFILE_ID_BOTH_DIR_INFORMATION );
|
||
CdSetFidFromParentAndDirent( IdBothDirInfo->FileId, Fcb, ThisDirent );
|
||
break;
|
||
|
||
case FileIdFullDirectoryInformation:
|
||
|
||
IdFullDirInfo = Add2Ptr( UserBuffer, NextEntry, PFILE_ID_FULL_DIR_INFORMATION );
|
||
CdSetFidFromParentAndDirent( IdFullDirInfo->FileId, Fcb, ThisDirent );
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
//
|
||
// Now copy as much of the name as possible. We also may have a version
|
||
// string to copy.
|
||
//
|
||
|
||
if (FileNameBytes != 0) {
|
||
|
||
//
|
||
// This is a Unicode name, we can copy the bytes directly.
|
||
//
|
||
|
||
RtlCopyMemory( Add2Ptr( UserBuffer, NextEntry + BaseLength, PVOID ),
|
||
ThisDirent->CdFileName.FileName.Buffer,
|
||
FileNameBytes );
|
||
|
||
if (SeparatorBytes != 0) {
|
||
|
||
*(Add2Ptr( UserBuffer,
|
||
NextEntry + BaseLength + FileNameBytes,
|
||
PWCHAR )) = L';';
|
||
|
||
if (VersionStringBytes != 0) {
|
||
|
||
RtlCopyMemory( Add2Ptr( UserBuffer,
|
||
NextEntry + BaseLength + FileNameBytes + sizeof( WCHAR ),
|
||
PVOID ),
|
||
ThisDirent->CdFileName.VersionString.Buffer,
|
||
VersionStringBytes );
|
||
}
|
||
}
|
||
}
|
||
|
||
//
|
||
// Fill in the short name if we got STATUS_SUCCESS. The short name
|
||
// may already be in the file context. Otherwise we will check
|
||
// whether the long name is 8.3. Special case the self and parent
|
||
// directory names.
|
||
//
|
||
|
||
if ((Status == STATUS_SUCCESS) &&
|
||
(IrpSp->Parameters.QueryDirectory.FileInformationClass == FileBothDirectoryInformation ||
|
||
IrpSp->Parameters.QueryDirectory.FileInformationClass == FileIdBothDirectoryInformation) &&
|
||
(Ccb->SearchExpression.VersionString.Length == 0) &&
|
||
!FlagOn( ThisDirent->Flags, DIRENT_FLAG_CONSTANT_ENTRY )) {
|
||
|
||
//
|
||
// If we already have the short name then copy into the user's buffer.
|
||
//
|
||
|
||
if (FileContext.ShortName.FileName.Length != 0) {
|
||
|
||
RtlCopyMemory( DirInfo->ShortName,
|
||
FileContext.ShortName.FileName.Buffer,
|
||
FileContext.ShortName.FileName.Length );
|
||
|
||
DirInfo->ShortNameLength = (CCHAR) FileContext.ShortName.FileName.Length;
|
||
|
||
//
|
||
// If the short name length is currently zero then check if
|
||
// the long name is not 8.3. We can copy the short name in
|
||
// unicode form directly into the caller's buffer.
|
||
//
|
||
|
||
} else {
|
||
|
||
if (!CdIs8dot3Name( IrpContext,
|
||
ThisDirent->CdFileName.FileName )) {
|
||
|
||
CdGenerate8dot3Name( IrpContext,
|
||
&ThisDirent->CdCaseFileName.FileName,
|
||
ThisDirent->DirentOffset,
|
||
DirInfo->ShortName,
|
||
&FileContext.ShortName.FileName.Length );
|
||
|
||
DirInfo->ShortNameLength = (CCHAR) FileContext.ShortName.FileName.Length;
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
//
|
||
// Sum the total number of bytes for the information field.
|
||
//
|
||
|
||
FileNameBytes += SeparatorBytes + VersionStringBytes;
|
||
|
||
//
|
||
// Update the information with the number of bytes stored in the
|
||
// buffer. We quad-align the existing buffer to add any necessary
|
||
// pad bytes.
|
||
//
|
||
|
||
Information = NextEntry + BaseLength + FileNameBytes;
|
||
|
||
//
|
||
// Go back to the previous entry and fill in the update to this entry.
|
||
//
|
||
|
||
*(Add2Ptr( UserBuffer, LastEntry, PULONG )) = NextEntry - LastEntry;
|
||
|
||
//
|
||
// Set up our variables for the next dirent.
|
||
//
|
||
|
||
InitialQuery = FALSE;
|
||
|
||
LastEntry = NextEntry;
|
||
NextEntry = QuadAlign( Information );
|
||
|
||
} except (EXCEPTION_EXECUTE_HANDLER) {
|
||
|
||
//
|
||
// We had a problem filling in the user's buffer, so stop and
|
||
// fail this request. This is the only reason any exception
|
||
// would have occured at this level.
|
||
//
|
||
|
||
Information = 0;
|
||
try_leave( Status = GetExceptionCode());
|
||
}
|
||
}
|
||
|
||
DoCcbUpdate = TRUE;
|
||
|
||
} finally {
|
||
|
||
//
|
||
// Cleanup our search context - *before* aquiring the FCB mutex exclusive,
|
||
// else can block on threads in cdcreateinternalstream/purge which
|
||
// hold the FCB but are waiting for all maps in this stream to be released.
|
||
//
|
||
|
||
CdCleanupFileContext( IrpContext, &FileContext );
|
||
|
||
//
|
||
// Now we can safely aqure the FCB mutex if we need to.
|
||
//
|
||
|
||
if (DoCcbUpdate && !NT_ERROR( Status )) {
|
||
|
||
//
|
||
// Update the Ccb to show the current state of the enumeration.
|
||
//
|
||
|
||
CdLockFcb( IrpContext, Fcb );
|
||
|
||
Ccb->CurrentDirentOffset = ThisDirent->DirentOffset;
|
||
|
||
ClearFlag( Ccb->Flags, CCB_FLAG_ENUM_RETURN_NEXT );
|
||
|
||
if (ReturnNextEntry) {
|
||
|
||
SetFlag( Ccb->Flags, CCB_FLAG_ENUM_RETURN_NEXT );
|
||
}
|
||
|
||
CdUnlockFcb( IrpContext, Fcb );
|
||
}
|
||
|
||
//
|
||
// Release the Fcb.
|
||
//
|
||
|
||
CdReleaseFile( IrpContext, Fcb );
|
||
}
|
||
|
||
//
|
||
// Complete the request here.
|
||
//
|
||
|
||
Irp->IoStatus.Information = Information;
|
||
|
||
CdCompleteRequest( IrpContext, Irp, Status );
|
||
return Status;
|
||
}
|
||
|
||
|
||
//
|
||
// Local support routines
|
||
//
|
||
|
||
NTSTATUS
|
||
CdNotifyChangeDirectory (
|
||
IN PIRP_CONTEXT IrpContext,
|
||
IN PIRP Irp,
|
||
IN PIO_STACK_LOCATION IrpSp,
|
||
IN PCCB Ccb
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine performs the notify change directory operation. It is
|
||
responsible for either completing of enqueuing the input Irp. Although there
|
||
will never be a notify signalled on a CDROM disk we still support this call.
|
||
|
||
We have already checked that this is not an OpenById handle.
|
||
|
||
Arguments:
|
||
|
||
Irp - Supplies the Irp to process
|
||
|
||
IrpSp - Io stack location for this request.
|
||
|
||
Ccb - Handle to the directory being watched.
|
||
|
||
Return Value:
|
||
|
||
NTSTATUS - STATUS_PENDING, any other error will raise.
|
||
|
||
--*/
|
||
|
||
{
|
||
PAGED_CODE();
|
||
|
||
//
|
||
// Always set the wait bit in the IrpContext so the initial wait can't fail.
|
||
//
|
||
|
||
SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT );
|
||
|
||
//
|
||
// Acquire the Vcb shared.
|
||
//
|
||
|
||
CdAcquireVcbShared( IrpContext, IrpContext->Vcb, FALSE );
|
||
|
||
//
|
||
// Use a try-finally to facilitate cleanup.
|
||
//
|
||
|
||
try {
|
||
|
||
//
|
||
// Verify the Vcb.
|
||
//
|
||
|
||
CdVerifyVcb( IrpContext, IrpContext->Vcb );
|
||
|
||
//
|
||
// 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.
|
||
//
|
||
|
||
FsRtlNotifyFullChangeDirectory( IrpContext->Vcb->NotifySync,
|
||
&IrpContext->Vcb->DirNotifyList,
|
||
Ccb,
|
||
(PSTRING) &IrpSp->FileObject->FileName,
|
||
BooleanFlagOn( IrpSp->Flags, SL_WATCH_TREE ),
|
||
FALSE,
|
||
IrpSp->Parameters.NotifyDirectory.CompletionFilter,
|
||
Irp,
|
||
NULL,
|
||
NULL );
|
||
|
||
} finally {
|
||
|
||
//
|
||
// Release the Vcb.
|
||
//
|
||
|
||
CdReleaseVcb( IrpContext, IrpContext->Vcb );
|
||
}
|
||
|
||
//
|
||
// Cleanup the IrpContext.
|
||
//
|
||
|
||
CdCompleteRequest( IrpContext, NULL, STATUS_SUCCESS );
|
||
|
||
return STATUS_PENDING;
|
||
}
|
||
|
||
|
||
//
|
||
// Local support routine
|
||
//
|
||
|
||
VOID
|
||
CdInitializeEnumeration (
|
||
IN PIRP_CONTEXT IrpContext,
|
||
IN PIO_STACK_LOCATION IrpSp,
|
||
IN PFCB Fcb,
|
||
IN OUT PCCB Ccb,
|
||
IN OUT PFILE_ENUM_CONTEXT FileContext,
|
||
OUT PBOOLEAN ReturnNextEntry,
|
||
OUT PBOOLEAN ReturnSingleEntry,
|
||
OUT PBOOLEAN InitialQuery
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine is called to initialize the enumeration variables and structures.
|
||
We look at the state of a previous enumeration from the Ccb as well as any
|
||
input values from the user. On exit we will position the FileContext at
|
||
a file in the directory and let the caller know whether this entry or the
|
||
next entry should be returned.
|
||
|
||
Arguments:
|
||
|
||
IrpSp - Irp stack location for this request.
|
||
|
||
Fcb - Fcb for this directory.
|
||
|
||
Ccb - Ccb for the directory handle.
|
||
|
||
FileContext - FileContext to use for this enumeration.
|
||
|
||
ReturnNextEntry - Address to store whether we should return the entry at
|
||
the FileContext position or the next entry.
|
||
|
||
ReturnSingleEntry - Address to store whether we should only return
|
||
a single entry.
|
||
|
||
InitialQuery - Address to store whether this is the first enumeration
|
||
query on this handle.
|
||
|
||
Return Value:
|
||
|
||
None.
|
||
|
||
--*/
|
||
|
||
{
|
||
NTSTATUS Status;
|
||
|
||
PUNICODE_STRING FileName;
|
||
CD_NAME WildCardName;
|
||
CD_NAME SearchExpression;
|
||
|
||
ULONG CcbFlags;
|
||
|
||
ULONG DirentOffset;
|
||
ULONG LastDirentOffset;
|
||
BOOLEAN KnownOffset;
|
||
|
||
BOOLEAN Found;
|
||
|
||
PAGED_CODE();
|
||
|
||
//
|
||
// If this is the initial query then build a search expression from the input
|
||
// file name.
|
||
//
|
||
|
||
if (!FlagOn( Ccb->Flags, CCB_FLAG_ENUM_INITIALIZED )) {
|
||
|
||
FileName = (PUNICODE_STRING) IrpSp->Parameters.QueryDirectory.FileName;
|
||
|
||
CcbFlags = 0;
|
||
|
||
//
|
||
// If the filename is not specified or is a single '*' then we will
|
||
// match all names.
|
||
//
|
||
|
||
if ((FileName == NULL) ||
|
||
(FileName->Buffer == NULL) ||
|
||
(FileName->Length == 0) ||
|
||
((FileName->Length == sizeof( WCHAR )) &&
|
||
(FileName->Buffer[0] == L'*'))) {
|
||
|
||
SetFlag( CcbFlags, CCB_FLAG_ENUM_MATCH_ALL );
|
||
RtlZeroMemory( &SearchExpression, sizeof( SearchExpression ));
|
||
|
||
//
|
||
// Otherwise build the CdName from the name in the stack location.
|
||
// This involves building both the name and version portions and
|
||
// checking for wild card characters. We also upcase the string if
|
||
// this is a case-insensitive search.
|
||
//
|
||
|
||
} else {
|
||
|
||
//
|
||
// Create a CdName to check for wild cards.
|
||
//
|
||
|
||
WildCardName.FileName = *FileName;
|
||
|
||
CdConvertNameToCdName( IrpContext, &WildCardName );
|
||
|
||
//
|
||
// The name better have at least one character.
|
||
//
|
||
|
||
if (WildCardName.FileName.Length == 0) {
|
||
|
||
CdRaiseStatus( IrpContext, STATUS_INVALID_PARAMETER );
|
||
}
|
||
|
||
//
|
||
// Check for wildcards in the separate components.
|
||
//
|
||
|
||
if (FsRtlDoesNameContainWildCards( &WildCardName.FileName)) {
|
||
|
||
SetFlag( CcbFlags, CCB_FLAG_ENUM_NAME_EXP_HAS_WILD );
|
||
}
|
||
|
||
if ((WildCardName.VersionString.Length != 0) &&
|
||
(FsRtlDoesNameContainWildCards( &WildCardName.VersionString ))) {
|
||
|
||
SetFlag( CcbFlags, CCB_FLAG_ENUM_VERSION_EXP_HAS_WILD );
|
||
|
||
//
|
||
// Check if this is a wild card only and match all version
|
||
// strings.
|
||
//
|
||
|
||
if ((WildCardName.VersionString.Length == sizeof( WCHAR )) &&
|
||
(WildCardName.VersionString.Buffer[0] == L'*')) {
|
||
|
||
SetFlag( CcbFlags, CCB_FLAG_ENUM_VERSION_MATCH_ALL );
|
||
}
|
||
}
|
||
|
||
//
|
||
// Now create the search expression to store in the Ccb.
|
||
//
|
||
|
||
SearchExpression.FileName.Buffer = FsRtlAllocatePoolWithTag( CdPagedPool,
|
||
FileName->Length,
|
||
TAG_ENUM_EXPRESSION );
|
||
|
||
SearchExpression.FileName.MaximumLength = FileName->Length;
|
||
|
||
//
|
||
// Either copy the name directly or perform the upcase.
|
||
//
|
||
|
||
if (FlagOn( Ccb->Flags, CCB_FLAG_IGNORE_CASE )) {
|
||
|
||
Status = RtlUpcaseUnicodeString( (PUNICODE_STRING) &SearchExpression.FileName,
|
||
FileName,
|
||
FALSE );
|
||
|
||
//
|
||
// This should never fail.
|
||
//
|
||
|
||
ASSERT( Status == STATUS_SUCCESS );
|
||
|
||
} else {
|
||
|
||
RtlCopyMemory( SearchExpression.FileName.Buffer,
|
||
FileName->Buffer,
|
||
FileName->Length );
|
||
}
|
||
|
||
//
|
||
// Now split into the separate name and version components.
|
||
//
|
||
|
||
SearchExpression.FileName.Length = WildCardName.FileName.Length;
|
||
SearchExpression.VersionString.Length = WildCardName.VersionString.Length;
|
||
SearchExpression.VersionString.MaximumLength = WildCardName.VersionString.MaximumLength;
|
||
|
||
SearchExpression.VersionString.Buffer = Add2Ptr( SearchExpression.FileName.Buffer,
|
||
SearchExpression.FileName.Length + sizeof( WCHAR ),
|
||
PWCHAR );
|
||
}
|
||
|
||
//
|
||
// But we do not want to return the constant "." and ".." entries for
|
||
// the root directory, for consistency with the rest of Microsoft's
|
||
// filesystems.
|
||
//
|
||
|
||
if (Fcb == Fcb->Vcb->RootIndexFcb) {
|
||
|
||
SetFlag( CcbFlags, CCB_FLAG_ENUM_NOMATCH_CONSTANT_ENTRY );
|
||
}
|
||
|
||
//
|
||
// Now lock the Fcb in order to update the Ccb with the inital
|
||
// enumeration values.
|
||
//
|
||
|
||
CdLockFcb( IrpContext, Fcb );
|
||
|
||
//
|
||
// Check again that this is the initial search.
|
||
//
|
||
|
||
if (!FlagOn( Ccb->Flags, CCB_FLAG_ENUM_INITIALIZED )) {
|
||
|
||
//
|
||
// Update the values in the Ccb.
|
||
//
|
||
|
||
Ccb->CurrentDirentOffset = Fcb->StreamOffset;
|
||
Ccb->SearchExpression = SearchExpression;
|
||
|
||
//
|
||
// Set the appropriate flags in the Ccb.
|
||
//
|
||
|
||
SetFlag( Ccb->Flags, CcbFlags | CCB_FLAG_ENUM_INITIALIZED );
|
||
|
||
//
|
||
// Otherwise cleanup any buffer allocated here.
|
||
//
|
||
|
||
} else {
|
||
|
||
if (!FlagOn( CcbFlags, CCB_FLAG_ENUM_MATCH_ALL )) {
|
||
|
||
ExFreePool( SearchExpression.FileName.Buffer );
|
||
}
|
||
}
|
||
|
||
//
|
||
// Otherwise lock the Fcb so we can read the current enumeration values.
|
||
//
|
||
|
||
} else {
|
||
|
||
CdLockFcb( IrpContext, Fcb );
|
||
}
|
||
|
||
//
|
||
// Capture the current state of the enumeration.
|
||
//
|
||
// If the user specified an index then use his offset. We always
|
||
// return the next entry in this case.
|
||
//
|
||
|
||
if (FlagOn( IrpSp->Flags, SL_INDEX_SPECIFIED )) {
|
||
|
||
KnownOffset = FALSE;
|
||
DirentOffset = IrpSp->Parameters.QueryDirectory.FileIndex;
|
||
*ReturnNextEntry = TRUE;
|
||
|
||
//
|
||
// If we are restarting the scan then go from the self entry.
|
||
//
|
||
|
||
} else if (FlagOn( IrpSp->Flags, SL_RESTART_SCAN )) {
|
||
|
||
KnownOffset = TRUE;
|
||
DirentOffset = Fcb->StreamOffset;
|
||
*ReturnNextEntry = FALSE;
|
||
|
||
//
|
||
// Otherwise use the values from the Ccb.
|
||
//
|
||
|
||
} else {
|
||
|
||
KnownOffset = TRUE;
|
||
DirentOffset = Ccb->CurrentDirentOffset;
|
||
*ReturnNextEntry = BooleanFlagOn( Ccb->Flags, CCB_FLAG_ENUM_RETURN_NEXT );
|
||
}
|
||
|
||
//
|
||
// Unlock the Fcb.
|
||
//
|
||
|
||
CdUnlockFcb( IrpContext, Fcb );
|
||
|
||
//
|
||
// We have the starting offset in the directory and whether to return
|
||
// that entry or the next. If we are at the beginning of the directory
|
||
// and are returning that entry, then tell our caller this is the
|
||
// initial query.
|
||
//
|
||
|
||
*InitialQuery = FALSE;
|
||
|
||
if ((DirentOffset == Fcb->StreamOffset) &&
|
||
!(*ReturnNextEntry)) {
|
||
|
||
*InitialQuery = TRUE;
|
||
}
|
||
|
||
//
|
||
// If there is no file object then create it now.
|
||
//
|
||
|
||
if (Fcb->FileObject == NULL) {
|
||
|
||
CdCreateInternalStream( IrpContext, Fcb->Vcb, Fcb );
|
||
}
|
||
|
||
//
|
||
// Determine the offset in the stream to position the FileContext and
|
||
// whether this offset is known to be a file offset.
|
||
//
|
||
// If this offset is known to be safe then go ahead and position the
|
||
// file context. This handles the cases where the offset is the beginning
|
||
// of the stream, the offset is from a previous search or this is the
|
||
// initial query.
|
||
//
|
||
|
||
if (KnownOffset) {
|
||
|
||
CdLookupInitialFileDirent( IrpContext, Fcb, FileContext, DirentOffset );
|
||
|
||
//
|
||
// Otherwise we walk through the directory from the beginning until
|
||
// we reach the entry which contains this offset.
|
||
//
|
||
|
||
} else {
|
||
|
||
LastDirentOffset = Fcb->StreamOffset;
|
||
Found = TRUE;
|
||
|
||
CdLookupInitialFileDirent( IrpContext, Fcb, FileContext, LastDirentOffset );
|
||
|
||
//
|
||
// If the requested offset is prior to the beginning offset in the stream
|
||
// then don't return the next entry.
|
||
//
|
||
|
||
if (DirentOffset < LastDirentOffset) {
|
||
|
||
*ReturnNextEntry = FALSE;
|
||
|
||
//
|
||
// Else look for the last entry which ends past the desired index.
|
||
//
|
||
|
||
} else {
|
||
|
||
//
|
||
// Keep walking through the directory until we run out of
|
||
// entries or we find an entry which ends beyond the input
|
||
// index value.
|
||
//
|
||
|
||
do {
|
||
|
||
//
|
||
// If we have passed the index value then exit.
|
||
//
|
||
|
||
if (FileContext->InitialDirent->Dirent.DirentOffset > DirentOffset) {
|
||
|
||
Found = FALSE;
|
||
break;
|
||
}
|
||
|
||
//
|
||
// Remember the current position in case we need to go back.
|
||
//
|
||
|
||
LastDirentOffset = FileContext->InitialDirent->Dirent.DirentOffset;
|
||
|
||
//
|
||
// Exit if the next entry is beyond the desired index value.
|
||
//
|
||
|
||
if (LastDirentOffset + FileContext->InitialDirent->Dirent.DirentLength > DirentOffset) {
|
||
|
||
break;
|
||
}
|
||
|
||
Found = CdLookupNextInitialFileDirent( IrpContext, Fcb, FileContext );
|
||
|
||
} while (Found);
|
||
|
||
//
|
||
// If we didn't find the entry then go back to the last known entry.
|
||
// This can happen if the index lies in the unused range at the
|
||
// end of a sector.
|
||
//
|
||
|
||
if (!Found) {
|
||
|
||
CdCleanupFileContext( IrpContext, FileContext );
|
||
CdInitializeFileContext( IrpContext, FileContext );
|
||
|
||
CdLookupInitialFileDirent( IrpContext, Fcb, FileContext, LastDirentOffset );
|
||
}
|
||
}
|
||
}
|
||
|
||
//
|
||
// Only update the dirent name if we will need it for some reason.
|
||
// Don't update this name if we are returning the next entry and
|
||
// the search string has a version component.
|
||
//
|
||
|
||
FileContext->ShortName.FileName.Length = 0;
|
||
|
||
if (!(*ReturnNextEntry) ||
|
||
(Ccb->SearchExpression.VersionString.Length == 0)) {
|
||
|
||
//
|
||
// Update the name in the dirent into filename and version components.
|
||
//
|
||
|
||
CdUpdateDirentName( IrpContext,
|
||
&FileContext->InitialDirent->Dirent,
|
||
FlagOn( Ccb->Flags, CCB_FLAG_IGNORE_CASE ));
|
||
}
|
||
|
||
//
|
||
// Look at the flag in the IrpSp indicating whether to return just
|
||
// one entry.
|
||
//
|
||
|
||
*ReturnSingleEntry = FALSE;
|
||
|
||
if (FlagOn( IrpSp->Flags, SL_RETURN_SINGLE_ENTRY )) {
|
||
|
||
*ReturnSingleEntry = TRUE;
|
||
}
|
||
|
||
return;
|
||
}
|
||
|
||
|
||
//
|
||
// Local support routine
|
||
//
|
||
|
||
BOOLEAN
|
||
CdEnumerateIndex (
|
||
IN PIRP_CONTEXT IrpContext,
|
||
IN PCCB Ccb,
|
||
IN OUT PFILE_ENUM_CONTEXT FileContext,
|
||
IN BOOLEAN ReturnNextEntry
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine is the worker routine for index enumeration. We are positioned
|
||
at some dirent in the directory and will either return the first match
|
||
at that point or look to the next entry. The Ccb contains details about
|
||
the type of matching to do. If the user didn't specify a version in
|
||
his search string then we only return the first version of a sequence
|
||
of files with versions. We also don't return any associated files.
|
||
|
||
Arguments:
|
||
|
||
Ccb - Ccb for this directory handle.
|
||
|
||
FileContext - File context already positioned at some entry in the directory.
|
||
|
||
ReturnNextEntry - Indicates if we are returning this entry or should start
|
||
with the next entry.
|
||
|
||
Return Value:
|
||
|
||
BOOLEAN - TRUE if next entry is found, FALSE otherwise.
|
||
|
||
--*/
|
||
|
||
{
|
||
PDIRENT PreviousDirent = NULL;
|
||
PDIRENT ThisDirent = &FileContext->InitialDirent->Dirent;
|
||
|
||
BOOLEAN Found = FALSE;
|
||
|
||
PAGED_CODE();
|
||
|
||
//
|
||
// Loop until we find a match or exaust the directory.
|
||
//
|
||
|
||
while (TRUE) {
|
||
|
||
//
|
||
// Move to the next entry unless we want to consider the current
|
||
// entry.
|
||
//
|
||
|
||
if (ReturnNextEntry) {
|
||
|
||
if (!CdLookupNextInitialFileDirent( IrpContext, Ccb->Fcb, FileContext )) {
|
||
|
||
break;
|
||
}
|
||
|
||
PreviousDirent = ThisDirent;
|
||
ThisDirent = &FileContext->InitialDirent->Dirent;
|
||
|
||
CdUpdateDirentName( IrpContext, ThisDirent, FlagOn( Ccb->Flags, CCB_FLAG_IGNORE_CASE ));
|
||
|
||
} else {
|
||
|
||
ReturnNextEntry = TRUE;
|
||
}
|
||
|
||
//
|
||
// Don't bother if we have a constant entry and are ignoring them.
|
||
//
|
||
|
||
if (FlagOn( ThisDirent->Flags, DIRENT_FLAG_CONSTANT_ENTRY ) &&
|
||
FlagOn( Ccb->Flags, CCB_FLAG_ENUM_NOMATCH_CONSTANT_ENTRY )) {
|
||
|
||
continue;
|
||
}
|
||
|
||
//
|
||
// Look at the current entry if it is not an associated file
|
||
// and the name doesn't match the previous file if the version
|
||
// name is not part of the search.
|
||
//
|
||
|
||
if (!FlagOn( ThisDirent->DirentFlags, CD_ATTRIBUTE_ASSOC )) {
|
||
|
||
//
|
||
// Check if this entry matches the previous entry except
|
||
// for version number and whether we should return the
|
||
// entry in that case. Go directly to the name comparison
|
||
// if:
|
||
//
|
||
// There is no previous entry.
|
||
// The search expression has a version component.
|
||
// The name length doesn't match the length of the previous entry.
|
||
// The base name strings don't match.
|
||
//
|
||
|
||
if ((PreviousDirent == NULL) ||
|
||
(Ccb->SearchExpression.VersionString.Length != 0) ||
|
||
(PreviousDirent->CdCaseFileName.FileName.Length != ThisDirent->CdCaseFileName.FileName.Length) ||
|
||
FlagOn( PreviousDirent->DirentFlags, CD_ATTRIBUTE_ASSOC ) ||
|
||
!RtlEqualMemory( PreviousDirent->CdCaseFileName.FileName.Buffer,
|
||
ThisDirent->CdCaseFileName.FileName.Buffer,
|
||
ThisDirent->CdCaseFileName.FileName.Length )) {
|
||
|
||
//
|
||
// If we match all names then return to our caller.
|
||
//
|
||
|
||
if (FlagOn( Ccb->Flags, CCB_FLAG_ENUM_MATCH_ALL )) {
|
||
|
||
FileContext->ShortName.FileName.Length = 0;
|
||
Found = TRUE;
|
||
break;
|
||
}
|
||
|
||
//
|
||
// Check if the long name matches the search expression.
|
||
//
|
||
|
||
if (CdIsNameInExpression( IrpContext,
|
||
&ThisDirent->CdCaseFileName,
|
||
&Ccb->SearchExpression,
|
||
Ccb->Flags,
|
||
TRUE )) {
|
||
|
||
//
|
||
// Let our caller know we found an entry.
|
||
//
|
||
|
||
Found = TRUE;
|
||
FileContext->ShortName.FileName.Length = 0;
|
||
break;
|
||
}
|
||
|
||
//
|
||
// The long name didn't match so we need to check for a
|
||
// possible short name match. There is no match if the
|
||
// long name is 8dot3 or the search expression has a
|
||
// version component. Special case the self and parent
|
||
// entries.
|
||
//
|
||
|
||
if ((Ccb->SearchExpression.VersionString.Length == 0) &&
|
||
!FlagOn( ThisDirent->Flags, DIRENT_FLAG_CONSTANT_ENTRY ) &&
|
||
!CdIs8dot3Name( IrpContext,
|
||
ThisDirent->CdFileName.FileName )) {
|
||
|
||
CdGenerate8dot3Name( IrpContext,
|
||
&ThisDirent->CdCaseFileName.FileName,
|
||
ThisDirent->DirentOffset,
|
||
FileContext->ShortName.FileName.Buffer,
|
||
&FileContext->ShortName.FileName.Length );
|
||
|
||
//
|
||
// Check if this name matches.
|
||
//
|
||
|
||
if (CdIsNameInExpression( IrpContext,
|
||
&FileContext->ShortName,
|
||
&Ccb->SearchExpression,
|
||
Ccb->Flags,
|
||
FALSE )) {
|
||
|
||
//
|
||
// Let our caller know we found an entry.
|
||
//
|
||
|
||
Found = TRUE;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
//
|
||
// If we found the entry then make sure we walk through all of the
|
||
// file dirents.
|
||
//
|
||
|
||
if (Found) {
|
||
|
||
CdLookupLastFileDirent( IrpContext, Ccb->Fcb, FileContext );
|
||
}
|
||
|
||
return Found;
|
||
}
|
||
|