reactos/drivers/filesystems/npfs/volume.c

   1 /*
   2 * COPYRIGHT:        See COPYING in the top level directory
   3 * PROJECT:          ReactOS kernel
   4 * FILE:             drivers/fs/npfs/volume.c
   5 * PURPOSE:          Named pipe filesystem
   6 * PROGRAMMER:       Eric Kohl
   7 */
   8
   9 /* INCLUDES *****************************************************************/
  10
  11 #include "npfs.h"
  12
  13 #define NDEBUG
  14 #include <debug.h>
  15
  16 /* FUNCTIONS ****************************************************************/
  17
  18 static NTSTATUS
  19 NpfsQueryFsDeviceInformation(PFILE_FS_DEVICE_INFORMATION FsDeviceInfo,
  20                              PULONG BufferLength)
  21 {
  22     DPRINT("NpfsQueryFsDeviceInformation()\n");
  23     DPRINT("FsDeviceInfo = %p\n", FsDeviceInfo);
  24
  25     if (*BufferLength < sizeof(FILE_FS_DEVICE_INFORMATION))
  26         return STATUS_BUFFER_OVERFLOW;
  27
  28     FsDeviceInfo->DeviceType = FILE_DEVICE_NAMED_PIPE;
  29     FsDeviceInfo->Characteristics = 0;
  30
  31     *BufferLength -= sizeof(FILE_FS_DEVICE_INFORMATION);
  32
  33     DPRINT("NpfsQueryFsDeviceInformation() finished.\n");
  34
  35     return STATUS_SUCCESS;
  36 }
  37
  38
  39 static NTSTATUS
  40 NpfsQueryFsAttributeInformation(PFILE_FS_ATTRIBUTE_INFORMATION FsAttributeInfo,
  41                                 PULONG BufferLength)
  42 {
  43     DPRINT("NpfsQueryFsAttributeInformation() called.\n");
  44     DPRINT("FsAttributeInfo = %p\n", FsAttributeInfo);
  45
  46     if (*BufferLength < sizeof(FILE_FS_ATTRIBUTE_INFORMATION) + 8)
  47         return STATUS_BUFFER_OVERFLOW;
  48
  49     FsAttributeInfo->FileSystemAttributes = FILE_CASE_PRESERVED_NAMES;
  50     FsAttributeInfo->MaximumComponentNameLength = 255;
  51     FsAttributeInfo->FileSystemNameLength = 8;
  52     wcscpy(FsAttributeInfo->FileSystemName,
  53         L"NPFS");
  54
  55     DPRINT("NpfsQueryFsAttributeInformation() finished.\n");
  56     *BufferLength -= (sizeof(FILE_FS_ATTRIBUTE_INFORMATION) + 8);
  57
  58     return STATUS_SUCCESS;
  59 }
  60
  61
  62 NTSTATUS NTAPI
  63 NpfsQueryVolumeInformation(PDEVICE_OBJECT DeviceObject,
  64                            PIRP Irp)
  65 {
  66     PIO_STACK_LOCATION Stack;
  67     FS_INFORMATION_CLASS FsInformationClass;
  68     NTSTATUS Status = STATUS_SUCCESS;
  69     PVOID SystemBuffer;
  70     ULONG BufferLength;
  71
  72     /* PRECONDITION */
  73     ASSERT(DeviceObject != NULL);
  74     ASSERT(Irp != NULL);
  75
  76     DPRINT("NpfsQueryVolumeInformation(DeviceObject %p, Irp %p)\n",
  77         DeviceObject,
  78         Irp);
  79
  80     Stack = IoGetCurrentIrpStackLocation(Irp);
  81     FsInformationClass = Stack->Parameters.QueryVolume.FsInformationClass;
  82     BufferLength = Stack->Parameters.QueryVolume.Length;
  83     SystemBuffer = Irp->AssociatedIrp.SystemBuffer;
  84
  85     DPRINT("FsInformationClass %d\n", FsInformationClass);
  86     DPRINT("SystemBuffer %p\n", SystemBuffer);
  87
  88     switch (FsInformationClass)
  89     {
  90     case FileFsDeviceInformation:
  91         Status = NpfsQueryFsDeviceInformation(SystemBuffer,
  92             &BufferLength);
  93         break;
  94
  95     case FileFsAttributeInformation:
  96         Status = NpfsQueryFsAttributeInformation(SystemBuffer,
  97             &BufferLength);
  98         break;
  99
 100     default:
 101         Status = STATUS_NOT_SUPPORTED;
 102     }
 103
 104     Irp->IoStatus.Status = Status;
 105     if (NT_SUCCESS(Status))
 106         Irp->IoStatus.Information = Stack->Parameters.QueryVolume.Length - BufferLength;
 107     else
 108         Irp->IoStatus.Information = 0;
 109     IoCompleteRequest(Irp,
 110         IO_NO_INCREMENT);
 111
 112     return Status;
 113 }
 114
 115 /* EOF */