537 lines
10 KiB
C
537 lines
10 KiB
C
/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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VolInfo.c
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Abstract:
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This module implements the volume information routines for NPFS called by
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the dispatch driver.
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Author:
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Gary Kimura [GaryKi] 12-Apr-1990
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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 local debug trace level
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//
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#define Dbg (DEBUG_TRACE_VOLINFO)
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//
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// Local procedure prototypes
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//
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NTSTATUS
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NpCommonQueryVolumeInformation (
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IN PIRP Irp
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);
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NTSTATUS
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NpQueryFsDeviceInfo (
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IN PFILE_FS_DEVICE_INFORMATION Buffer,
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IN OUT PULONG Length
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);
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NTSTATUS
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NpQueryFsAttributeInfo (
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IN PFILE_FS_ATTRIBUTE_INFORMATION Buffer,
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IN OUT PULONG Length
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);
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NTSTATUS
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NpQueryFsVolumeInfo (
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IN PFILE_FS_VOLUME_INFORMATION Buffer,
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IN OUT PULONG Length
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);
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NTSTATUS
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NpQueryFsSizeInfo (
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IN PFILE_FS_SIZE_INFORMATION Buffer,
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IN OUT PULONG Length
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);
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NTSTATUS
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NpQueryFsFullSizeInfo (
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IN PFILE_FS_FULL_SIZE_INFORMATION Buffer,
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IN OUT PULONG Length
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);
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, NpCommonQueryVolumeInformation)
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#pragma alloc_text(PAGE, NpFsdQueryVolumeInformation)
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#pragma alloc_text(PAGE, NpQueryFsAttributeInfo)
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#pragma alloc_text(PAGE, NpQueryFsDeviceInfo)
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#pragma alloc_text(PAGE, NpQueryFsVolumeInfo)
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#pragma alloc_text(PAGE, NpQueryFsSizeInfo)
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#pragma alloc_text(PAGE, NpQueryFsFullSizeInfo)
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#endif
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NTSTATUS
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NpFsdQueryVolumeInformation (
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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 implements the Fsd part of the NtQueryVolumeInformation API
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call.
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Arguments:
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VolumeDeviceObject - Supplies the volume device object where the file
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being queried exists.
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Irp - Supplies the Irp being processed.
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Return Value:
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NTSTATUS - The FSD status for the Irp.
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--*/
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{
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NTSTATUS Status;
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PAGED_CODE();
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DebugTrace(+1, Dbg, "NpFsdQueryVolumeInformation\n", 0);
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//
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// Call the common query routine, with blocking allowed if synchronous
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//
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FsRtlEnterFileSystem();
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Status = NpCommonQueryVolumeInformation( Irp );
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FsRtlExitFileSystem();
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if (Status != STATUS_PENDING) {
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NpCompleteRequest (Irp, Status);
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}
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//
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// And return to our caller
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//
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DebugTrace(-1, Dbg, "NpFsdQueryVolumeInformation -> %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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NpCommonQueryVolumeInformation (
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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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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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ULONG Length;
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FS_INFORMATION_CLASS FsInformationClass;
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PVOID Buffer;
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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, "NptCommonQueryVolumeInfo...\n", 0);
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DebugTrace( 0, Dbg, "Irp = %08lx\n", Irp );
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DebugTrace( 0, Dbg, "Length = %08lx\n", IrpSp->Parameters.QueryVolume.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", Irp->AssociatedIrp.SystemBuffer);
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//
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// Reference our input parameters to make things easier
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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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switch (FsInformationClass) {
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case FileFsDeviceInformation:
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Status = NpQueryFsDeviceInfo( Buffer, &Length );
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break;
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case FileFsAttributeInformation:
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Status = NpQueryFsAttributeInfo( Buffer, &Length );
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break;
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case FileFsVolumeInformation:
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Status = NpQueryFsVolumeInfo( Buffer, &Length );
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break;
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case FileFsSizeInformation:
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Status = NpQueryFsSizeInfo( Buffer, &Length );
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break;
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case FileFsFullSizeInformation:
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Status = NpQueryFsFullSizeInfo( Buffer, &Length );
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break;
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default:
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Status = STATUS_NOT_SUPPORTED;
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break;
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}
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//
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// Set the information field to the number of bytes actually filled in
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//
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Irp->IoStatus.Information = IrpSp->Parameters.QueryVolume.Length - Length;
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//
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// And return to our caller
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//
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DebugTrace(-1, Dbg, "NpCommonQueryVolumeInformation -> %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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NpQueryFsDeviceInfo (
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IN PFILE_FS_DEVICE_INFORMATION Buffer,
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IN OUT PULONG Length
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)
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/*++
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Routine Description:
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This routine implements the query volume device call
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Arguments:
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Buffer - Supplies a pointer to the output buffer where the information
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is to be returned
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Length - Supplies the length of the buffer in byte. This variable
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upon return recieves the remaining bytes free in the buffer
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Return Value:
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Status - Returns the status for the query
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--*/
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{
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PAGED_CODE();
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DebugTrace(0, Dbg, "NpQueryFsDeviceInfo...\n", 0);
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//
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// Make sure the buffer is large enough
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//
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if (*Length < sizeof(FILE_FS_DEVICE_INFORMATION)) {
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return STATUS_BUFFER_OVERFLOW;
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}
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RtlZeroMemory( Buffer, sizeof(FILE_FS_DEVICE_INFORMATION) );
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//
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// Set the output buffer
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//
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Buffer->DeviceType = FILE_DEVICE_NAMED_PIPE;
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//
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// Adjust the length variable
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//
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*Length -= sizeof(FILE_FS_DEVICE_INFORMATION);
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//
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// And return success to our caller
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//
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return STATUS_SUCCESS;
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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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NpQueryFsAttributeInfo (
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IN PFILE_FS_ATTRIBUTE_INFORMATION Buffer,
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IN OUT PULONG Length
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)
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/*++
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Routine Description:
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This routine implements the query volume attribute call
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Arguments:
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Buffer - Supplies a pointer to the output buffer where the information
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is to be returned
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Length - Supplies the length of the buffer in byte. This variable
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upon return recieves the remaining bytes free in the buffer
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Return Value:
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Status - Returns the status for the 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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PAGED_CODE();
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DebugTrace(0, Dbg, "NpQueryFsAttributeInfo...\n", 0);
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//
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// Determine how much of the file system name will fit.
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//
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if ( (*Length - FIELD_OFFSET( FILE_FS_ATTRIBUTE_INFORMATION,
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FileSystemName[0] )) >= 8 ) {
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BytesToCopy = 8;
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*Length -= FIELD_OFFSET( FILE_FS_ATTRIBUTE_INFORMATION,
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FileSystemName[0] ) + 8;
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Status = STATUS_SUCCESS;
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} else {
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BytesToCopy = *Length - FIELD_OFFSET( FILE_FS_ATTRIBUTE_INFORMATION,
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FileSystemName[0]);
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*Length = 0;
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Status = STATUS_BUFFER_OVERFLOW;
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}
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//
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// Set the output buffer
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//
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Buffer->FileSystemAttributes = FILE_CASE_PRESERVED_NAMES;
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Buffer->MaximumComponentNameLength = MAXULONG;
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Buffer->FileSystemNameLength = BytesToCopy;
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RtlCopyMemory( &Buffer->FileSystemName[0], L"NPFS", BytesToCopy );
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//
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// And return success to our caller
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//
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return Status;
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}
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NTSTATUS
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NpQueryFsVolumeInfo (
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IN PFILE_FS_VOLUME_INFORMATION Buffer,
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IN OUT PULONG Length
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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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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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Return Value:
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NTSTATUS - The result of this query.
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--*/
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{
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#define NPFS_VOLUME_LABEL L"NamedPipe"
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ULONG BytesToCopy;
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NTSTATUS Status;
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Status = STATUS_SUCCESS;
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Buffer->VolumeCreationTime.QuadPart = 0;
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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 (NPFS_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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NPFS_VOLUME_LABEL,
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BytesToCopy );
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}
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*Length -= BytesToCopy;
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//
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// Set our status and return to our caller
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//
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return Status;
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}
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NTSTATUS
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NpQueryFsSizeInfo (
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IN PFILE_FS_SIZE_INFORMATION Buffer,
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IN OUT PULONG Length
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)
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/*++
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Routine Description:
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This routine implements the query size info call
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Arguments:
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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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Return Value:
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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 = 1;
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Buffer->BytesPerSector = 1;
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*Length -= sizeof( FILE_FS_SIZE_INFORMATION );
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//
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// Set our status and return to our caller
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//
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return STATUS_SUCCESS;
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}
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NTSTATUS
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NpQueryFsFullSizeInfo (
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IN PFILE_FS_FULL_SIZE_INFORMATION Buffer,
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IN OUT PULONG Length
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)
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/*++
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Routine Description:
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This routine implements the query full size info call
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Arguments:
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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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Return Value:
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NTSTATUS - The result of this query.
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--*/
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{
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RtlZeroMemory( Buffer, sizeof(FILE_FS_FULL_SIZE_INFORMATION) );
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*Length -= sizeof(FILE_FS_FULL_SIZE_INFORMATION);
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//
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// Set our status and return to our caller
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//
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return STATUS_SUCCESS;
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}
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