reactos/drivers/fs/np/volume.c

   1 /* $Id$
   2  *
   3  * COPYRIGHT:        See COPYING in the top level directory
   4  * PROJECT:          ReactOS kernel
   5  * FILE:             drivers/fs/npfs/volume.c
   6  * PURPOSE:          Named pipe filesystem
   7  * PROGRAMMER:       Eric Kohl
   8  */
   9
  10 /* INCLUDES *****************************************************************/
  11
  12 #include <ddk/ntddk.h>
  13 #include <wchar.h>
  14
  15 #define NDEBUG
  16 #include <debug.h>
  17
  18 #include "npfs.h"
  19
  20 /* FUNCTIONS ****************************************************************/
  21
  22 static NTSTATUS
  23 NpfsQueryFsDeviceInformation(PFILE_FS_DEVICE_INFORMATION FsDeviceInfo,
  24                              PULONG BufferLength)
  25 {
  26   DPRINT("NpfsQueryFsDeviceInformation()\n");
  27   DPRINT("FsDeviceInfo = %p\n", FsDeviceInfo);
  28
  29   if (*BufferLength < sizeof(FILE_FS_DEVICE_INFORMATION))
  30     return STATUS_BUFFER_OVERFLOW;
  31
  32   FsDeviceInfo->DeviceType = FILE_DEVICE_NAMED_PIPE;
  33   FsDeviceInfo->Characteristics = 0;
  34
  35   *BufferLength -= sizeof(FILE_FS_DEVICE_INFORMATION);
  36
  37   DPRINT("NpfsQueryFsDeviceInformation() finished.\n");
  38
  39   return STATUS_SUCCESS;
  40 }
  41
  42
  43 static NTSTATUS
  44 NpfsQueryFsAttributeInformation(PFILE_FS_ATTRIBUTE_INFORMATION FsAttributeInfo,
  45                                 PULONG BufferLength)
  46 {
  47   DPRINT("NpfsQueryFsAttributeInformation() called.\n");
  48   DPRINT("FsAttributeInfo = %p\n", FsAttributeInfo);
  49
  50   if (*BufferLength < sizeof(FILE_FS_ATTRIBUTE_INFORMATION) + 8)
  51     return STATUS_BUFFER_OVERFLOW;
  52
  53   FsAttributeInfo->FileSystemAttributes = FILE_CASE_PRESERVED_NAMES;
  54   FsAttributeInfo->MaximumComponentNameLength = 255;
  55   FsAttributeInfo->FileSystemNameLength = 8;
  56   wcscpy(FsAttributeInfo->FileSystemName,
  57          L"NPFS");
  58
  59   DPRINT("NpfsQueryFsAttributeInformation() finished.\n");
  60   *BufferLength -= (sizeof(FILE_FS_ATTRIBUTE_INFORMATION) + 8);
  61
  62   return STATUS_SUCCESS;
  63 }
  64
  65
  66 NTSTATUS STDCALL
  67 NpfsQueryVolumeInformation(PDEVICE_OBJECT DeviceObject,
  68                            PIRP Irp)
  69 {
  70   PIO_STACK_LOCATION Stack;
  71   FS_INFORMATION_CLASS FsInformationClass;
  72   NTSTATUS Status = STATUS_SUCCESS;
  73   PVOID SystemBuffer;
  74   ULONG BufferLength;
  75
  76   /* PRECONDITION */
  77   ASSERT(DeviceObject != NULL);
  78   ASSERT(Irp != NULL);
  79
  80   DPRINT("NpfsQueryVolumeInformation(DeviceObject %x, Irp %x)\n",
  81          DeviceObject,
  82          Irp);
  83
  84   Stack = IoGetCurrentIrpStackLocation(Irp);
  85   FsInformationClass = Stack->Parameters.QueryVolume.FsInformationClass;
  86   BufferLength = Stack->Parameters.QueryVolume.Length;
  87   SystemBuffer = Irp->AssociatedIrp.SystemBuffer;
  88
  89   DPRINT("FsInformationClass %d\n", FsInformationClass);
  90   DPRINT("SystemBuffer %x\n", SystemBuffer);
  91
  92   switch (FsInformationClass)
  93     {
  94       case FileFsDeviceInformation:
  95         Status = NpfsQueryFsDeviceInformation(SystemBuffer,
  96                                               &BufferLength);
  97         break;
  98
  99       case FileFsAttributeInformation:
 100         Status = NpfsQueryFsAttributeInformation(SystemBuffer,
 101                                                  &BufferLength);
 102         break;
 103
 104       default:
 105         Status = STATUS_NOT_SUPPORTED;
 106     }
 107
 108   Irp->IoStatus.Status = Status;
 109   if (NT_SUCCESS(Status))
 110     Irp->IoStatus.Information = Stack->Parameters.QueryVolume.Length - BufferLength;
 111   else
 112     Irp->IoStatus.Information = 0;
 113   IoCompleteRequest(Irp,
 114                     IO_NO_INCREMENT);
 115
 116   return Status;
 117 }
 118
 119 /* EOF */