623 lines
13 KiB
C
623 lines
13 KiB
C
/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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fileinfo.c
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Abstract:
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This module implements the get / set volume information routines for
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MSFS called by the dispatch driver.
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Setting volume information is currently unimplemented in MSFS.
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Author:
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Manny Weiser (mannyw) 31-Jan-1991
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Revision History:
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--*/
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#include "mailslot.h"
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//
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// The debug trace level
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//
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#define Dbg (DEBUG_TRACE_FILEINFO)
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//
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// Local procedure prototypes.
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//
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NTSTATUS
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MsCommonQueryVolumeInformation (
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IN PMSFS_DEVICE_OBJECT MsfsDeviceObject,
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IN PIRP Irp
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);
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NTSTATUS
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MsQueryAttributeInfo (
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IN PVCB Vcb,
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IN PFILE_FS_ATTRIBUTE_INFORMATION Buffer,
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IN ULONG Length,
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OUT PULONG BytesWritten
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);
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NTSTATUS
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MsQueryFsVolumeInfo (
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IN PVCB Vcb,
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IN PFILE_FS_VOLUME_INFORMATION Buffer,
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IN ULONG Length,
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OUT PULONG BytesWritten
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);
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NTSTATUS
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MsQueryFsSizeInfo (
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IN PVCB Vcb,
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IN PFILE_FS_SIZE_INFORMATION Buffer,
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IN ULONG Length,
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OUT PULONG BytesWritten
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);
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NTSTATUS
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MsQueryFsFullSizeInfo (
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IN PVCB Vcb,
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IN PFILE_FS_FULL_SIZE_INFORMATION Buffer,
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IN ULONG Length,
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OUT PULONG BytesWritten
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);
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NTSTATUS
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MsQueryFsDeviceInfo (
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IN PVCB Vcb,
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IN PFILE_FS_DEVICE_INFORMATION Buffer,
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IN ULONG Length,
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OUT PULONG BytesWritten
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);
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text( PAGE, MsCommonQueryVolumeInformation )
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#pragma alloc_text( PAGE, MsFsdQueryVolumeInformation )
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#pragma alloc_text( PAGE, MsQueryAttributeInfo )
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#pragma alloc_text( PAGE, MsQueryFsVolumeInfo )
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#pragma alloc_text( PAGE, MsQueryFsSizeInfo )
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#pragma alloc_text( PAGE, MsQueryFsDeviceInfo )
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#pragma alloc_text( PAGE, MsQueryFsFullSizeInfo )
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#endif
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NTSTATUS
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MsFsdQueryVolumeInformation (
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IN PMSFS_DEVICE_OBJECT MsfsDeviceObject,
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IN PIRP Irp
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)
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/*++
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Routine Description:
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This routine implements the FSD part of the NtQueryVolumeInformationFile
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API calls.
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Arguments:
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MsfsDeviceObject - Supplies a pointer to the device object to use.
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Irp - Supplies a pointer to the Irp to process.
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Return Value:
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NTSTATUS - The Fsd status for the Irp
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--*/
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{
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NTSTATUS status;
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PAGED_CODE();
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DebugTrace(+1, Dbg, "MsFsdQueryVolumeInformation\n", 0);
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//
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// Call the common query volume information routine.
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//
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FsRtlEnterFileSystem();
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status = MsCommonQueryVolumeInformation( MsfsDeviceObject, Irp );
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FsRtlExitFileSystem();
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//
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// Return to the caller.
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//
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DebugTrace(-1, Dbg, "MsFsdQueryVolumeInformation -> %08lx\n", status );
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return status;
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}
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NTSTATUS
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MsCommonQueryVolumeInformation (
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IN PMSFS_DEVICE_OBJECT MsfsDeviceObject,
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IN PIRP Irp
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)
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/*++
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Routine Description:
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This is the common routine for querying volume information.
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Arguments:
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MsfsDeviceObject - The device object to use.
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Irp - Supplies the Irp to process
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Return Value:
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NTSTATUS - the return status for the operation.
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--*/
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{
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PIO_STACK_LOCATION irpSp;
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NTSTATUS status;
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ULONG length;
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ULONG bytesWritten = 0;
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FS_INFORMATION_CLASS fsInformationClass;
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PVOID buffer;
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NODE_TYPE_CODE nodeTypeCode;
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PVCB vcb;
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PVOID fsContext, fsContext2;
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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, "MsCommonQueryInformation...\n", 0);
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DebugTrace( 0, Dbg, " Irp = %08lx\n", (ULONG)Irp);
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DebugTrace( 0, Dbg, " ->Length = %08lx\n", irpSp->Parameters.QueryFile.Length);
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DebugTrace( 0, Dbg, " ->FsInformationClass = %08lx\n", irpSp->Parameters.QueryVolume.FsInformationClass);
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DebugTrace( 0, Dbg, " ->Buffer = %08lx\n", (ULONG)Irp->AssociatedIrp.SystemBuffer);
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//
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// Find out who are.
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//
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if ((nodeTypeCode = MsDecodeFileObject( irpSp->FileObject,
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&fsContext,
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&fsContext2 )) == NTC_UNDEFINED) {
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DebugTrace(0, Dbg, "Mailslot is disconnected from us\n", 0);
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MsCompleteRequest( Irp, STATUS_FILE_FORCED_CLOSED );
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status = STATUS_FILE_FORCED_CLOSED;
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DebugTrace(-1, Dbg, "MsCommonQueryInformation -> %08lx\n", status );
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return status;
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}
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//
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// Decide how to handle this request. A user can query information
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// on a VCB only.
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//
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switch (nodeTypeCode) {
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case MSFS_NTC_VCB:
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vcb = (PVCB)fsContext;
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break;
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case MSFS_NTC_ROOT_DCB :
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//
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// Explorer calls us like this. Ship from the root dir to the volume.
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//
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vcb = (PVCB) ((PROOT_DCB_CCB)fsContext2)->Vcb;
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MsReferenceVcb (vcb);
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MsDereferenceRootDcb ((PROOT_DCB) fsContext);
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break;
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default: // This is not a volume control block.
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DebugTrace(0, Dbg, "Node type code is not incorrect\n", 0);
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MsDereferenceNode( (PNODE_HEADER)fsContext );
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MsCompleteRequest( Irp, STATUS_INVALID_PARAMETER );
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DebugTrace(-1,
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Dbg,
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"MsCommonQueryVolumeInformation -> STATUS_INVALID_PARAMETER\n",
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0);
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return STATUS_INVALID_PARAMETER;
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}
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//
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// Make local copies of the input parameters.
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//
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length = irpSp->Parameters.QueryVolume.Length;
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fsInformationClass = irpSp->Parameters.QueryVolume.FsInformationClass;
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buffer = Irp->AssociatedIrp.SystemBuffer;
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//
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// Now acquire shared access to the VCB
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//
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MsAcquireSharedVcb( vcb );
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try {
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//
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// Decide how to handle the request.
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//
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switch (fsInformationClass) {
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case FileFsAttributeInformation:
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status = MsQueryAttributeInfo( vcb, buffer, length, &bytesWritten );
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break;
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case FileFsVolumeInformation:
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status = MsQueryFsVolumeInfo( vcb, buffer, length, &bytesWritten );
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break;
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case FileFsSizeInformation:
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status = MsQueryFsSizeInfo( vcb, buffer, length, &bytesWritten );
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break;
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case FileFsFullSizeInformation:
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status = MsQueryFsFullSizeInfo( vcb, buffer, length, &bytesWritten );
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break;
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case FileFsDeviceInformation:
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status = MsQueryFsDeviceInfo( vcb, buffer, length, &bytesWritten );
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break;
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default:
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status = STATUS_INVALID_PARAMETER;
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break;
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}
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} finally {
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MsReleaseVcb( vcb );
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MsDereferenceVcb( vcb );
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//
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// Set the information field to the number of bytes actually
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// filled in and then complete the request.
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//
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Irp->IoStatus.Information = bytesWritten;
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MsCompleteRequest( Irp, status );
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DebugTrace(-1, Dbg, "MsCommonQueryVolumeInformation -> %08lx\n", status );
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}
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return status;
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}
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NTSTATUS
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MsQueryAttributeInfo (
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IN PVCB Vcb,
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IN PFILE_FS_ATTRIBUTE_INFORMATION Buffer,
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IN ULONG Length,
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OUT PULONG BytesWritten
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)
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/*++
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Routine Description:
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This routine performs the query fs attribute information operation.
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Arguments:
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Vcb - Supplies the VCB to query.
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Buffer - Supplies a pointer to the buffer where the information is
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to be returned.
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Length - Supplies the length of the buffer in bytes.
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BytesWritten - Returns the number of bytes written to the buffer.
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Return Value:
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NTSTATUS - The result of this query.
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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(0, Dbg, "QueryFsAttributeInfo...\n", 0);
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//
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// See how many bytes of the file system name we can copy.
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//
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Length -= FIELD_OFFSET( FILE_FS_ATTRIBUTE_INFORMATION, FileSystemName[0] );
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if ( Length >= Vcb->FileSystemName.Length ) {
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status = STATUS_SUCCESS;
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*BytesWritten = Vcb->FileSystemName.Length;
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} else {
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status = STATUS_BUFFER_OVERFLOW;
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*BytesWritten = Length;
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}
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//
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// Fill in the attribute information.
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//
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Buffer->FileSystemAttributes = FILE_CASE_PRESERVED_NAMES;
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Buffer->MaximumComponentNameLength = MAXIMUM_FILENAME_LENGTH;
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//
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// And copy over the file name and its length.
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//
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RtlCopyMemory (&Buffer->FileSystemName[0],
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&Vcb->FileSystemName.Buffer[0],
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*BytesWritten);
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Buffer->FileSystemNameLength = *BytesWritten;
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//
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// Now account for the fixed part of the structure
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//
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*BytesWritten += FIELD_OFFSET( FILE_FS_ATTRIBUTE_INFORMATION, FileSystemName[0] );
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return status;
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}
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NTSTATUS
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MsQueryFsVolumeInfo (
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IN PVCB Vcb,
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IN PFILE_FS_VOLUME_INFORMATION Buffer,
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IN ULONG Length,
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OUT PULONG BytesWritten
|
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)
|
||
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/*++
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||
|
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Routine Description:
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||
|
||
This routine implements the query volume info call
|
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Arguments:
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|
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Vcb - Supplies the VCB to query.
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Buffer - Supplies a pointer to the buffer where the information is
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to be returned.
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Length - Supplies the length of the buffer in bytes.
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BytesWritten - Returns the number of bytes written to the buffer.
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Return Value:
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NTSTATUS - The result of this query.
|
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--*/
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{
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ULONG BytesToCopy;
|
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NTSTATUS Status;
|
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|
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Status = STATUS_SUCCESS;
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Buffer->VolumeCreationTime = Vcb->CreationTime;
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Buffer->VolumeSerialNumber = 0;
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Buffer->SupportsObjects = FALSE;
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Length -= FIELD_OFFSET( FILE_FS_VOLUME_INFORMATION, VolumeLabel[0] );
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//
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// Check if the buffer we're given is long enough
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//
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BytesToCopy = sizeof (MSFS_VOLUME_LABEL) - sizeof (WCHAR);
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if (Length < BytesToCopy) {
|
||
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BytesToCopy = Length;
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Status = STATUS_BUFFER_OVERFLOW;
|
||
}
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|
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//
|
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// Copy over what we can of the volume label, and adjust *Length
|
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//
|
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Buffer->VolumeLabelLength = BytesToCopy;
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if (BytesToCopy) {
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RtlCopyMemory( &Buffer->VolumeLabel[0],
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MSFS_VOLUME_LABEL,
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BytesToCopy );
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}
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*BytesWritten = FIELD_OFFSET( FILE_FS_VOLUME_INFORMATION, VolumeLabel[0] ) + BytesToCopy;
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//
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// Set our status and return to our caller
|
||
//
|
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return Status;
|
||
}
|
||
|
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NTSTATUS
|
||
MsQueryFsSizeInfo (
|
||
IN PVCB Vcb,
|
||
IN PFILE_FS_SIZE_INFORMATION Buffer,
|
||
IN ULONG Length,
|
||
OUT PULONG BytesWritten
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine implements the query size info call
|
||
|
||
Arguments:
|
||
|
||
Vcb - Supplies the VCB to query.
|
||
|
||
Buffer - Supplies a pointer to the buffer where the information is
|
||
to be returned.
|
||
|
||
Length - Supplies the length of the buffer in bytes.
|
||
|
||
BytesWritten - Returns the number of bytes written to the buffer.
|
||
|
||
Return Value:
|
||
|
||
NTSTATUS - The result of this query.
|
||
|
||
--*/
|
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|
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{
|
||
|
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Buffer->TotalAllocationUnits.QuadPart = 0;
|
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Buffer->AvailableAllocationUnits.QuadPart = 0;
|
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Buffer->SectorsPerAllocationUnit = 0;
|
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Buffer->BytesPerSector = 0;
|
||
|
||
*BytesWritten = sizeof( FILE_FS_SIZE_INFORMATION );
|
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|
||
//
|
||
// Set our status and return to our caller
|
||
//
|
||
|
||
return STATUS_SUCCESS;
|
||
}
|
||
|
||
NTSTATUS
|
||
MsQueryFsFullSizeInfo (
|
||
IN PVCB Vcb,
|
||
IN PFILE_FS_FULL_SIZE_INFORMATION Buffer,
|
||
IN ULONG Length,
|
||
OUT PULONG BytesWritten
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine implements the query full size info call
|
||
|
||
Arguments:
|
||
|
||
Vcb - Supplies the VCB to query.
|
||
|
||
Buffer - Supplies a pointer to the buffer where the information is
|
||
to be returned.
|
||
|
||
Length - Supplies the length of the buffer in bytes.
|
||
|
||
BytesWritten - Returns the number of bytes written to the buffer.
|
||
|
||
Return Value:
|
||
|
||
NTSTATUS - The result of this query.
|
||
|
||
--*/
|
||
|
||
{
|
||
|
||
RtlZeroMemory( Buffer, sizeof(FILE_FS_FULL_SIZE_INFORMATION) );
|
||
|
||
|
||
*BytesWritten = sizeof(FILE_FS_FULL_SIZE_INFORMATION);
|
||
|
||
//
|
||
// Set our status and return to our caller
|
||
//
|
||
|
||
return STATUS_SUCCESS;
|
||
}
|
||
|
||
NTSTATUS
|
||
MsQueryFsDeviceInfo (
|
||
IN PVCB Vcb,
|
||
IN PFILE_FS_DEVICE_INFORMATION Buffer,
|
||
IN ULONG Length,
|
||
OUT PULONG BytesWritten
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine implements the query size info call
|
||
|
||
Arguments:
|
||
|
||
Vcb - Supplies the VCB to query.
|
||
|
||
Buffer - Supplies a pointer to the buffer where the information is
|
||
to be returned.
|
||
|
||
Length - Supplies the length of the buffer in bytes.
|
||
|
||
BytesWritten - Returns the number of bytes written to the buffer.
|
||
|
||
Return Value:
|
||
|
||
NTSTATUS - The result of this query.
|
||
|
||
--*/
|
||
|
||
{
|
||
|
||
Buffer->Characteristics = 0;
|
||
Buffer->DeviceType = FILE_DEVICE_MAILSLOT;
|
||
|
||
//
|
||
// Adjust the length variable
|
||
//
|
||
|
||
*BytesWritten = sizeof( FILE_FS_DEVICE_INFORMATION );
|
||
|
||
//
|
||
// And return success to our caller
|
||
//
|
||
|
||
return STATUS_SUCCESS;
|
||
} |