883 lines
23 KiB
C
883 lines
23 KiB
C
/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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Dir.c
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Abstract:
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This module implements the File Directory routines for the Named Pipe
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file system by the dispatch driver.
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Author:
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Gary Kimura [GaryKi] 28-Dec-1989
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Revision History:
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--*/
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#include "NpProcs.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 (NPFS_BUG_CHECK_DIR)
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//
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// Local debug trace level
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//
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#define Dbg (DEBUG_TRACE_DIR)
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NTSTATUS
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NpCommonDirectoryControl (
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IN PNPFS_DEVICE_OBJECT NpfsDeviceObject,
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IN PIRP Irp
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);
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NTSTATUS
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NpQueryDirectory (
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IN PROOT_DCB RootDcb,
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IN PROOT_DCB_CCB Ccb,
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IN PIRP Irp
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);
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NTSTATUS
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NpNotifyChangeDirectory (
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IN PROOT_DCB RootDcb,
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IN PROOT_DCB_CCB Ccb,
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IN PIRP Irp
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);
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, NpCheckForNotify)
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#pragma alloc_text(PAGE, NpCommonDirectoryControl)
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#pragma alloc_text(PAGE, NpFsdDirectoryControl)
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#pragma alloc_text(PAGE, NpNotifyChangeDirectory)
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#pragma alloc_text(PAGE, NpQueryDirectory)
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#endif
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NTSTATUS
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NpFsdDirectoryControl (
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IN PNPFS_DEVICE_OBJECT NpfsDeviceObject,
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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 FSD routine that handles directory control
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functions (i.e., query and notify).
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Arguments:
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NpfsDeviceObject - Supplies the device object for the directory function.
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Irp - Supplies the IRP to process
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Return Value:
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NTSTATUS - The appropriate result status
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--*/
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{
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NTSTATUS Status;
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PAGED_CODE();
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DebugTrace(+1, Dbg, "NpFsdDirectoryControl\n", 0);
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//
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// Call the common Direcotry Control routine.
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//
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FsRtlEnterFileSystem();
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NpAcquireExclusiveVcb( );
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try {
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Status = NpCommonDirectoryControl( NpfsDeviceObject, Irp );
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} except(NpExceptionFilter( GetExceptionCode() )) {
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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 = NpProcessException( NpfsDeviceObject, Irp, GetExceptionCode() );
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}
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NpReleaseVcb();
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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, "NpFsdDirectoryControl -> %08lx\n", Status );
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return Status;
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}
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VOID
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NpCheckForNotify (
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IN PDCB Dcb,
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IN BOOLEAN CheckAllOutstandingIrps
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)
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/*++
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Routine Description:
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This routine checks the notify queues of a dcb and completes any
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outstanding IRPS.
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Note that the caller of this procedure must guarantee that the DCB
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is acquired for exclusive access.
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Arguments:
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Dcb - Supplies the Dcb to check if is has any notify Irps outstanding
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CheckAllOutstandingIrps - Indicates if only the NotifyFullQueue should be
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checked. If TRUE then all notify queues are checked, and if FALSE
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then only the NotifyFullQueue is checked.
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Return Value:
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None.
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--*/
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{
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PLIST_ENTRY Links;
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PIRP Irp;
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PAGED_CODE();
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//
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// We'll always signal the notify full queue entries. They want
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// to be notified if every any change is made to a directory
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//
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while (!IsListEmpty( &Dcb->Specific.Dcb.NotifyFullQueue )) {
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//
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// Remove the Irp from the head of the queue, and complete it
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// with success.
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//
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Links = RemoveHeadList( &Dcb->Specific.Dcb.NotifyFullQueue );
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Irp = CONTAINING_RECORD( Links, IRP, Tail.Overlay.ListEntry );
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NpCompleteRequest( Irp, STATUS_SUCCESS );
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}
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//
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// Now check if we should also do the partial notify queue.
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//
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if (CheckAllOutstandingIrps) {
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while (!IsListEmpty( &Dcb->Specific.Dcb.NotifyPartialQueue )) {
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//
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// Remove the Irp from the head of the queue, and complete it
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// with success.
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//
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Links = RemoveHeadList( &Dcb->Specific.Dcb.NotifyPartialQueue );
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Irp = CONTAINING_RECORD( Links, IRP, Tail.Overlay.ListEntry );
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NpCompleteRequest( Irp, STATUS_SUCCESS );
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}
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}
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return;
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}
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//
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// Local Support Routine
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//
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NTSTATUS
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NpCommonDirectoryControl (
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IN PNPFS_DEVICE_OBJECT NpfsDeviceObject,
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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 does the common code for directory control functions.
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Arguments:
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NpfsDeviceObject - Supplies the named pipe device object
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Irp - Supplies the Irp being processed
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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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PFCB Fcb;
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PROOT_DCB_CCB Ccb;
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PAGED_CODE();
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//
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// Get the current stack location
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//
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IrpSp = IoGetCurrentIrpStackLocation( Irp );
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DebugTrace(+1, Dbg, "NpCommonDirectoryControl...\n", 0);
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DebugTrace( 0, Dbg, "Irp = %08lx\n", Irp);
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//
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// Decode the file object to figure out who we are. If the result
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// is not the root dcb then its an illegal parameter.
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//
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if (NpDecodeFileObject( IrpSp->FileObject,
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&Fcb,
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(PCCB *)&Ccb,
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NULL ) != NPFS_NTC_ROOT_DCB) {
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DebugTrace(0, Dbg, "Not a directory\n", 0);
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NpCompleteRequest( Irp, STATUS_INVALID_PARAMETER );
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Status = STATUS_INVALID_PARAMETER;
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DebugTrace(-1, Dbg, "NpCommonDirectoryControl -> %08lx\n", Status );
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return Status;
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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 the appropriate work routines.
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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 = NpQueryDirectory( Fcb, Ccb, Irp );
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break;
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case IRP_MN_NOTIFY_CHANGE_DIRECTORY:
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Status = NpNotifyChangeDirectory( Fcb, Ccb, Irp );
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break;
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default:
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//
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// For all other minor function codes we say they're invalid
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// and complete the request.
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//
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DebugTrace(0, DEBUG_TRACE_ERROR, "Invalid FS Control Minor Function Code %08lx\n", IrpSp->MinorFunction);
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NpCompleteRequest( 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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DebugTrace(-1, Dbg, "NpCommonDirectoryControl -> %08lx\n", Status);
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return Status;
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}
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//
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// Internal support routine
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//
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NTSTATUS
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NpQueryDirectory (
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IN PROOT_DCB RootDcb,
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IN PROOT_DCB_CCB Ccb,
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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 work routine for querying a directory.
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Arugments:
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RootDcb - Supplies the dcb being queried
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Ccb - Supplies the context of the caller
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Irp - Supplies the Irp being processed
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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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PUCHAR Buffer;
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CLONG SystemBufferLength;
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UNICODE_STRING FileName;
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ULONG FileIndex;
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FILE_INFORMATION_CLASS FileInformationClass;
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BOOLEAN RestartScan;
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BOOLEAN ReturnSingleEntry;
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BOOLEAN IndexSpecified;
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static WCHAR Star = L'*';
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BOOLEAN CaseInsensitive = TRUE; //*** Make searches case insensitive
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ULONG CurrentIndex;
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ULONG LastEntry;
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ULONG NextEntry;
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PLIST_ENTRY Links;
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PFCB Fcb;
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PFILE_DIRECTORY_INFORMATION DirInfo;
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PFILE_NAMES_INFORMATION NamesInfo;
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PAGED_CODE();
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//
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// Get the current stack location
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//
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IrpSp = IoGetCurrentIrpStackLocation( Irp );
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DebugTrace(+1, Dbg, "NpQueryDirectory\n", 0 );
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DebugTrace( 0, Dbg, "RootDcb = %08lx\n", RootDcb);
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DebugTrace( 0, Dbg, "Ccb = %08lx\n", Ccb);
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DebugTrace( 0, Dbg, "SystemBuffer = %08lx\n", Irp->AssociatedIrp.SystemBuffer);
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DebugTrace( 0, Dbg, "Length = %08lx\n", IrpSp->Parameters.QueryDirectory.Length);
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DebugTrace( 0, Dbg, "FileName = %Z\n", IrpSp->Parameters.QueryDirectory.FileName);
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DebugTrace( 0, Dbg, "FileIndex = %08lx\n", IrpSp->Parameters.QueryDirectory.FileIndex);
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DebugTrace( 0, Dbg, "FileInformationClass = %08lx\n", IrpSp->Parameters.QueryDirectory.FileInformationClass);
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DebugTrace( 0, Dbg, "RestartScan = %08lx\n", FlagOn(IrpSp->Flags, SL_RESTART_SCAN));
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DebugTrace( 0, Dbg, "ReturnSingleEntry = %08lx\n", FlagOn(IrpSp->Flags, SL_RETURN_SINGLE_ENTRY));
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DebugTrace( 0, Dbg, "IndexSpecified = %08lx\n", FlagOn(IrpSp->Flags, SL_INDEX_SPECIFIED));
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//
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// Save references to the input parameters within the Irp
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//
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SystemBufferLength = IrpSp->Parameters.QueryDirectory.Length;
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FileIndex = IrpSp->Parameters.QueryDirectory.FileIndex;
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FileInformationClass = IrpSp->Parameters.QueryDirectory.FileInformationClass;
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RestartScan = BooleanFlagOn(IrpSp->Flags, SL_RESTART_SCAN);
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ReturnSingleEntry = BooleanFlagOn(IrpSp->Flags, SL_RETURN_SINGLE_ENTRY);
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IndexSpecified = BooleanFlagOn(IrpSp->Flags, SL_INDEX_SPECIFIED);
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if (IrpSp->Parameters.QueryDirectory.FileName != NULL) {
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FileName = *(PUNICODE_STRING)IrpSp->Parameters.QueryDirectory.FileName;
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} else {
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FileName.Length = 0;
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FileName.Buffer = NULL;
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}
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//
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// Check if the ccb already has a query template attached. If it
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// does not already have one then we either use the string we are
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// given or we attach our own containing "*"
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//
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if (Ccb->QueryTemplate == NULL) {
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//
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// This is our first time calling query directory so we need
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// to either set the query template to the user specified string
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// or to "*"
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//
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if (FileName.Buffer == NULL) {
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DebugTrace(0, Dbg, "Set template to *\n", 0);
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FileName.Length = 2;
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FileName.Buffer = ⋆
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}
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DebugTrace(0, Dbg, "Set query template -> %Z\n", &FileName);
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//
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// Allocate space for the query template
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//
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Ccb->QueryTemplate = FsRtlAllocatePool( PagedPool,
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sizeof(UNICODE_STRING) + FileName.Length );
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//
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// Initialize the query template and copy over the string
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//
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Ccb->QueryTemplate->Length = FileName.Length;
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Ccb->QueryTemplate->Buffer = (PWCH)Ccb->QueryTemplate +
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sizeof(UNICODE_STRING) / sizeof(WCHAR);
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RtlCopyMemory( Ccb->QueryTemplate->Buffer,
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FileName.Buffer,
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FileName.Length );
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//
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// Now zero out the FileName so we won't think we're to use it
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// as a subsearch string.
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//
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FileName.Length = 0;
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FileName.Buffer = NULL;
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}
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//
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// Check if we were given an index to start with or if we need to
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// restart the scan or if we should use the index that was saved in
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// the ccb
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//
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if (RestartScan) {
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FileIndex = 0;
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} else if (!IndexSpecified) {
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FileIndex = Ccb->IndexOfLastCcbReturned + 1;
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}
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//
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// Now we are committed to completing the Irp, we do that in
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// the finally clause of the following try.
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//
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try {
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ULONG BaseLength;
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ULONG LengthAdded;
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//
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// Map the user buffer.
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//
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Buffer = NpMapUserBuffer( Irp );
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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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// already decided which Fcb index we need to return. The variables
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// LastEntry and NextEntry are used to index into the user buffer.
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// LastEntry is the last entry we added to the user buffer, and
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// NextEntry is the current one we're working on. CurrentIndex
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// is the Fcb index that we are looking at next. Logically the
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// way the loop works is as follows.
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//
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// Scan all of the Fcb in the directory
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//
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// if the Fcb matches the query template then
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//
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// if the CurrentIndex is >= the FileIndex then
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//
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// process this fcb, and decide if we should
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// continue the main loop
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//
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// end if
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//
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// Increment the current index
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//
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// end if
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//
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// end scan
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//
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CurrentIndex = 0;
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LastEntry = 0;
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NextEntry =0;
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switch (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 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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default:
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try_return( Status = STATUS_INVALID_INFO_CLASS );
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}
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for (Links = RootDcb->Specific.Dcb.ParentDcbQueue.Flink;
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Links != &RootDcb->Specific.Dcb.ParentDcbQueue;
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Links = Links->Flink) {
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Fcb = CONTAINING_RECORD(Links, FCB, ParentDcbLinks);
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ASSERT(Fcb->NodeTypeCode == NPFS_NTC_FCB);
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DebugTrace(0, Dbg, "Top of Loop\n", 0);
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DebugTrace(0, Dbg, "Fcb = %08lx\n", Fcb);
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DebugTrace(0, Dbg, "CurrentIndex = %08lx\n", CurrentIndex);
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DebugTrace(0, Dbg, "FileIndex = %08lx\n", FileIndex);
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DebugTrace(0, Dbg, "LastEntry = %08lx\n", LastEntry);
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DebugTrace(0, Dbg, "NextEntry = %08lx\n", NextEntry);
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//
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// Check if the Fcb represents a named pipe that is part of
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// our query template
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//
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if (FsRtlIsNameInExpression( Ccb->QueryTemplate,
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&Fcb->LastFileName,
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CaseInsensitive,
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NULL )) {
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//
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// The fcb is in the query template so now check if
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// this is the index we should start returning
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//
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if (CurrentIndex >= FileIndex) {
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ULONG BytesToCopy;
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ULONG BytesRemainingInBuffer;
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//
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// Here are the rules concerning filling up the buffer:
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//
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// 1. The Io system garentees that there will always be
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// enough room for at least one base record.
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//
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// 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
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// STATUS_BUFFER_OVERFLOW is returned.
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//
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// 3. If a subsequent record cannot completely fit into the
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// buffer, none of it (as in 0 bytes) is copied, and
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// STATUS_SUCCESS is returned. A subsequent query will
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// pick up with this record.
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//
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BytesRemainingInBuffer = SystemBufferLength - NextEntry;
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if ( (NextEntry != 0) &&
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( (BaseLength + Fcb->LastFileName.Length > BytesRemainingInBuffer) ||
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(SystemBufferLength < NextEntry) ) ) {
|
||
|
||
DebugTrace(0, Dbg, "Next entry won't fit\n", 0);
|
||
|
||
try_return( Status = STATUS_SUCCESS );
|
||
}
|
||
|
||
ASSERT( BytesRemainingInBuffer >= BaseLength );
|
||
|
||
//
|
||
// See how much of the name we will be able to copy into
|
||
// the system buffer. This also dictates out return
|
||
// value.
|
||
//
|
||
|
||
if ( BaseLength + Fcb->LastFileName.Length <=
|
||
BytesRemainingInBuffer ) {
|
||
|
||
BytesToCopy = Fcb->LastFileName.Length;
|
||
Status = STATUS_SUCCESS;
|
||
|
||
} else {
|
||
|
||
BytesToCopy = BytesRemainingInBuffer - BaseLength;
|
||
Status = STATUS_BUFFER_OVERFLOW;
|
||
}
|
||
|
||
//
|
||
// Note how much of buffer we are consuming and zero
|
||
// the base part of the structure.
|
||
//
|
||
|
||
LengthAdded = BaseLength + BytesToCopy;
|
||
|
||
RtlZeroMemory( &Buffer[NextEntry], BaseLength );
|
||
|
||
//
|
||
// Now fill the base parts of the strucure that are
|
||
// applicable.
|
||
//
|
||
|
||
switch (FileInformationClass) {
|
||
|
||
case FileBothDirectoryInformation:
|
||
|
||
//
|
||
// We don't need short name
|
||
//
|
||
|
||
DebugTrace(0, Dbg, "Getting directory full information\n", 0);
|
||
|
||
case FileFullDirectoryInformation:
|
||
|
||
//
|
||
// We don't use EaLength, so fill in nothing here.
|
||
//
|
||
|
||
DebugTrace(0, Dbg, "Getting directory full information\n", 0);
|
||
|
||
case FileDirectoryInformation:
|
||
|
||
DebugTrace(0, Dbg, "Getting directory information\n", 0);
|
||
|
||
//
|
||
// The eof indicates the number of instances and
|
||
// allocation size is the maximum allowed
|
||
//
|
||
|
||
DirInfo = (PFILE_DIRECTORY_INFORMATION)&Buffer[NextEntry];
|
||
|
||
DirInfo->EndOfFile.QuadPart = Fcb->OpenCount;
|
||
DirInfo->AllocationSize.QuadPart = Fcb->Specific.Fcb.MaximumInstances;
|
||
|
||
DirInfo->FileAttributes = FILE_ATTRIBUTE_NORMAL;
|
||
|
||
DirInfo->FileNameLength = Fcb->LastFileName.Length;
|
||
|
||
break;
|
||
|
||
case FileNamesInformation:
|
||
|
||
DebugTrace(0, Dbg, "Getting names information\n", 0);
|
||
|
||
|
||
NamesInfo = (PFILE_NAMES_INFORMATION)&Buffer[NextEntry];
|
||
|
||
NamesInfo->FileNameLength = Fcb->LastFileName.Length;
|
||
|
||
break;
|
||
|
||
default:
|
||
|
||
NpBugCheck( FileInformationClass, 0, 0 );
|
||
}
|
||
|
||
RtlCopyMemory( &Buffer[NextEntry + BaseLength],
|
||
Fcb->LastFileName.Buffer,
|
||
BytesToCopy );
|
||
|
||
//
|
||
// Update the ccb to the index we've just used
|
||
//
|
||
|
||
Ccb->IndexOfLastCcbReturned = CurrentIndex;
|
||
|
||
//
|
||
// And indicate how much of the system buffer we have
|
||
// currently used up. We must compute this value before
|
||
// we long align outselves for the next entry
|
||
//
|
||
|
||
Irp->IoStatus.Information = NextEntry + LengthAdded;
|
||
|
||
//
|
||
// Setup the previous next entry offset
|
||
//
|
||
|
||
*((PULONG)(&Buffer[LastEntry])) = NextEntry - LastEntry;
|
||
|
||
//
|
||
// Check if the last entry didn't completely fit
|
||
//
|
||
|
||
if ( Status == STATUS_BUFFER_OVERFLOW ) {
|
||
|
||
try_return( NOTHING );
|
||
}
|
||
|
||
//
|
||
// Check if we are only to return a single entry
|
||
//
|
||
|
||
if (ReturnSingleEntry) {
|
||
|
||
try_return( Status = STATUS_SUCCESS );
|
||
}
|
||
|
||
//
|
||
// Set ourselves up for the next iteration
|
||
//
|
||
|
||
LastEntry = NextEntry;
|
||
NextEntry += (ULONG)QuadAlign( LengthAdded );
|
||
}
|
||
|
||
//
|
||
// Increment the current index by one
|
||
//
|
||
|
||
CurrentIndex += 1;
|
||
}
|
||
}
|
||
|
||
//
|
||
// At this point we've scanned the entire list of Fcb so if
|
||
// the NextEntry is zero then we haven't found anything so we
|
||
// will return no more files, otherwise we return success.
|
||
//
|
||
|
||
if (NextEntry == 0) {
|
||
|
||
Status = STATUS_NO_MORE_FILES;
|
||
|
||
} else {
|
||
|
||
Status = STATUS_SUCCESS;
|
||
}
|
||
|
||
try_exit: NOTHING;
|
||
} finally {
|
||
|
||
if (!AbnormalTermination()) {
|
||
|
||
NpCompleteRequest( Irp, Status );
|
||
}
|
||
|
||
DebugTrace(-1, Dbg, "NpQueryDirectory -> %08lx\n", Status);
|
||
}
|
||
|
||
return Status;
|
||
}
|
||
|
||
|
||
//
|
||
// Internal support routine
|
||
//
|
||
|
||
NTSTATUS
|
||
NpNotifyChangeDirectory (
|
||
IN PROOT_DCB RootDcb,
|
||
IN PROOT_DCB_CCB Ccb,
|
||
IN PIRP Irp
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This is the common routine for doing the notify change directory.
|
||
|
||
Arugments:
|
||
|
||
RootDcb - Supplies the dcb being queried
|
||
|
||
Ccb - Supplies the context of the caller
|
||
|
||
Irp - Supplies the Irp being processed
|
||
|
||
Return Value:
|
||
|
||
NTSTATUS - STATUS_PENDING
|
||
|
||
--*/
|
||
|
||
{
|
||
PIO_STACK_LOCATION IrpSp;
|
||
|
||
UNREFERENCED_PARAMETER( Ccb );
|
||
|
||
PAGED_CODE();
|
||
|
||
//
|
||
// Get the current stack location
|
||
//
|
||
|
||
IrpSp = IoGetCurrentIrpStackLocation( Irp );
|
||
|
||
DebugTrace(+1, Dbg, "NpNotifyChangeDirectory\n", 0 );
|
||
DebugTrace( 0, Dbg, "RootDcb = %08lx", RootDcb);
|
||
DebugTrace( 0, Dbg, "Ccb = %08lx", Ccb);
|
||
|
||
//
|
||
// Mark the Irp pending.
|
||
//
|
||
|
||
IoMarkIrpPending( Irp );
|
||
|
||
//
|
||
// BUGBUG - For now, simply place the packet on one of the old queues,
|
||
// full or partial, based on whether or not changes to anything
|
||
// other than names were requested. In the future, the filter
|
||
// must actually be implemented.
|
||
//
|
||
|
||
if (IrpSp->Parameters.NotifyDirectory.CompletionFilter &
|
||
~FILE_NOTIFY_CHANGE_NAME) {
|
||
|
||
InsertTailList( &RootDcb->Specific.Dcb.NotifyFullQueue,
|
||
&Irp->Tail.Overlay.ListEntry );
|
||
|
||
} else {
|
||
|
||
InsertTailList( &RootDcb->Specific.Dcb.NotifyPartialQueue,
|
||
&Irp->Tail.Overlay.ListEntry );
|
||
}
|
||
|
||
//
|
||
// return to our caller a value of status pending
|
||
//
|
||
|
||
DebugTrace(-1, Dbg, "NpNotifyChangeDirectory -> STATUS_PENDING\n", 0);
|
||
|
||
return STATUS_PENDING;
|
||
}
|