volume.c

来自「winNT技术操作系统,国外开放的原代码和LIUX一样」· C语言 代码 · 共 116 行

/*
 * COPYRIGHT:        See COPYING in the top level directory
 * PROJECT:          ReactOS kernel
 * FILE:             drivers/fs/npfs/volume.c
 * PURPOSE:          Named pipe filesystem
 * PROGRAMMER:       Eric Kohl
 */

/* INCLUDES *****************************************************************/

#define NDEBUG
#include <debug.h>

#include "npfs.h"

/* FUNCTIONS ****************************************************************/

static NTSTATUS
NpfsQueryFsDeviceInformation(PFILE_FS_DEVICE_INFORMATION FsDeviceInfo,
			     PULONG BufferLength)
{
  DPRINT("NpfsQueryFsDeviceInformation()\n");
  DPRINT("FsDeviceInfo = %p\n", FsDeviceInfo);

  if (*BufferLength < sizeof(FILE_FS_DEVICE_INFORMATION))
    return STATUS_BUFFER_OVERFLOW;

  FsDeviceInfo->DeviceType = FILE_DEVICE_NAMED_PIPE;
  FsDeviceInfo->Characteristics = 0;

  *BufferLength -= sizeof(FILE_FS_DEVICE_INFORMATION);

  DPRINT("NpfsQueryFsDeviceInformation() finished.\n");

  return STATUS_SUCCESS;
}


static NTSTATUS
NpfsQueryFsAttributeInformation(PFILE_FS_ATTRIBUTE_INFORMATION FsAttributeInfo,
				PULONG BufferLength)
{
  DPRINT("NpfsQueryFsAttributeInformation() called.\n");
  DPRINT("FsAttributeInfo = %p\n", FsAttributeInfo);

  if (*BufferLength < sizeof(FILE_FS_ATTRIBUTE_INFORMATION) + 8)
    return STATUS_BUFFER_OVERFLOW;

  FsAttributeInfo->FileSystemAttributes = FILE_CASE_PRESERVED_NAMES;
  FsAttributeInfo->MaximumComponentNameLength = 255;
  FsAttributeInfo->FileSystemNameLength = 8;
  wcscpy(FsAttributeInfo->FileSystemName,
	 L"NPFS");

  DPRINT("NpfsQueryFsAttributeInformation() finished.\n");
  *BufferLength -= (sizeof(FILE_FS_ATTRIBUTE_INFORMATION) + 8);

  return STATUS_SUCCESS;
}


NTSTATUS STDCALL
NpfsQueryVolumeInformation(PDEVICE_OBJECT DeviceObject,
			   PIRP Irp)
{
  PIO_STACK_LOCATION Stack;
  FS_INFORMATION_CLASS FsInformationClass;
  NTSTATUS Status = STATUS_SUCCESS;
  PVOID SystemBuffer;
  ULONG BufferLength;

  /* PRECONDITION */
  ASSERT(DeviceObject != NULL);
  ASSERT(Irp != NULL);

  DPRINT("NpfsQueryVolumeInformation(DeviceObject %x, Irp %x)\n",
	 DeviceObject,
	 Irp);

  Stack = IoGetCurrentIrpStackLocation(Irp);
  FsInformationClass = Stack->Parameters.QueryVolume.FsInformationClass;
  BufferLength = Stack->Parameters.QueryVolume.Length;
  SystemBuffer = Irp->AssociatedIrp.SystemBuffer;

  DPRINT("FsInformationClass %d\n", FsInformationClass);
  DPRINT("SystemBuffer %x\n", SystemBuffer);

  switch (FsInformationClass)
    {
      case FileFsDeviceInformation:
	Status = NpfsQueryFsDeviceInformation(SystemBuffer,
					      &BufferLength);
	break;

      case FileFsAttributeInformation:
	Status = NpfsQueryFsAttributeInformation(SystemBuffer,
						 &BufferLength);
	break;

      default:
	Status = STATUS_NOT_SUPPORTED;
    }

  Irp->IoStatus.Status = Status;
  if (NT_SUCCESS(Status))
    Irp->IoStatus.Information = Stack->Parameters.QueryVolume.Length - BufferLength;
  else
    Irp->IoStatus.Information = 0;
  IoCompleteRequest(Irp,
		    IO_NO_INCREMENT);

  return Status;
}

/* EOF */