drivers/filesystems/ntfs/rw.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 2002 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
  18  *
  19  * COPYRIGHT:        See COPYING in the top level directory
  20  * PROJECT:          ReactOS kernel
  21  * FILE:             drivers/filesystem/ntfs/rw.c
  22  * PURPOSE:          CDROM (ISO 9660) filesystem driver
  23  * PROGRAMMER:       Art Yerkes
  24  * UPDATE HISTORY:
  25  */
  26
  27 /* INCLUDES *****************************************************************/
  28
  29 #include <ntddk.h>
  30
  31 #define NDEBUG
  32 #include <debug.h>
  33
  34 #include "ntfs.h"
  35
  36
  37 /* GLOBALS *******************************************************************/
  38
  39 #define ROUND_UP(N, S) ((((N) + (S) - 1) / (S)) * (S))
  40 #define ROUND_DOWN(N, S) ((N) - ((N) % (S)))
  41
  42
  43 /* FUNCTIONS ****************************************************************/
  44
  45 static NTSTATUS
  46 NtfsReadFile(PDEVICE_EXTENSION DeviceExt,
  47              PFILE_OBJECT FileObject,
  48              PUCHAR Buffer,
  49              ULONG Length,
  50              ULONG ReadOffset,
  51              ULONG IrpFlags,
  52              PULONG LengthRead)
  53 /*
  54  * FUNCTION: Reads data from a file
  55  */
  56 {
  57 #if 0
  58   NTSTATUS Status = STATUS_SUCCESS;
  59   PUCHAR TempBuffer;
  60   ULONG TempLength;
  61   PCCB Ccb;
  62   PFCB Fcb;
  63
  64   DPRINT("CdfsReadFile(ReadOffset %lu  Length %lu)\n", ReadOffset, Length);
  65
  66   *LengthRead = 0;
  67
  68   if (Length == 0)
  69     return(STATUS_SUCCESS);
  70
  71   Ccb = (PCCB)FileObject->FsContext2;
  72   Fcb = (PFCB)FileObject->FsContext;
  73
  74   if (ReadOffset >= Fcb->Entry.DataLengthL)
  75     return(STATUS_END_OF_FILE);
  76
  77   DPRINT("Reading %d bytes at %d\n", Length, ReadOffset);
  78
  79   if (!(IrpFlags & (IRP_NOCACHE|IRP_PAGING_IO)))
  80     {
  81       LARGE_INTEGER FileOffset;
  82       IO_STATUS_BLOCK IoStatus;
  83
  84       if (ReadOffset + Length > Fcb->Entry.DataLengthL)
  85          Length = Fcb->Entry.DataLengthL - ReadOffset;
  86       if (FileObject->PrivateCacheMap == NULL)
  87       {
  88           CcRosInitializeFileCache(FileObject, PAGE_SIZE);
  89       }
  90
  91       FileOffset.QuadPart = (LONGLONG)ReadOffset;
  92       CcCopyRead(FileObject,
  93                  &FileOffset,
  94                  Length,
  95                  TRUE,
  96                  Buffer,
  97                  &IoStatus);
  98       *LengthRead = IoStatus.Information;
  99
 100       return(IoStatus.Status);
 101     }
 102
 103   if ((ReadOffset % BLOCKSIZE) != 0 || (Length % BLOCKSIZE) != 0)
 104     {
 105       return STATUS_INVALID_PARAMETER;
 106     }
 107   if (ReadOffset + Length > ROUND_UP(Fcb->Entry.DataLengthL, BLOCKSIZE))
 108     Length = ROUND_UP(Fcb->Entry.DataLengthL, BLOCKSIZE) - ReadOffset;
 109
 110   Status = CdfsReadSectors(DeviceExt->StorageDevice,
 111                            Fcb->Entry.ExtentLocationL + (ReadOffset / BLOCKSIZE),
 112                            Length / BLOCKSIZE,
 113                            Buffer);
 114   if (NT_SUCCESS(Status))
 115     {
 116       *LengthRead = Length;
 117       if (Length + ReadOffset > Fcb->Entry.DataLengthL)
 118       {
 119         memset(Buffer + Fcb->Entry.DataLengthL - ReadOffset,
 120                0, Length + ReadOffset - Fcb->Entry.DataLengthL);
 121       }
 122     }
 123
 124   return(Status);
 125 #else
 126   *LengthRead = 0;
 127   return STATUS_END_OF_FILE;
 128 #endif
 129 }
 130
 131
 132 NTSTATUS NTAPI
 133 NtfsFsdRead(PDEVICE_OBJECT DeviceObject,
 134          PIRP Irp)
 135 {
 136   PDEVICE_EXTENSION DeviceExt;
 137   PIO_STACK_LOCATION Stack;
 138   PFILE_OBJECT FileObject;
 139   PVOID Buffer;
 140   ULONG ReadLength;
 141   LARGE_INTEGER ReadOffset;
 142   ULONG ReturnedReadLength = 0;
 143   NTSTATUS Status = STATUS_SUCCESS;
 144
 145   DPRINT("NtfsRead(DeviceObject %x, Irp %x)\n",DeviceObject,Irp);
 146
 147   DeviceExt = DeviceObject->DeviceExtension;
 148   Stack = IoGetCurrentIrpStackLocation(Irp);
 149   FileObject = Stack->FileObject;
 150
 151   ReadLength = Stack->Parameters.Read.Length;
 152   ReadOffset = Stack->Parameters.Read.ByteOffset;
 153   Buffer = MmGetSystemAddressForMdl(Irp->MdlAddress);
 154
 155   Status = NtfsReadFile(DeviceExt,
 156                         FileObject,
 157                         Buffer,
 158                         ReadLength,
 159                         ReadOffset.u.LowPart,
 160                         Irp->Flags,
 161                         &ReturnedReadLength);
 162
 163   if (NT_SUCCESS(Status))
 164     {
 165       if (FileObject->Flags & FO_SYNCHRONOUS_IO)
 166         {
 167           FileObject->CurrentByteOffset.QuadPart =
 168             ReadOffset.QuadPart + ReturnedReadLength;
 169         }
 170       Irp->IoStatus.Information = ReturnedReadLength;
 171     }
 172   else
 173     {
 174       Irp->IoStatus.Information = 0;
 175     }
 176
 177   Irp->IoStatus.Status = Status;
 178   IoCompleteRequest(Irp,IO_NO_INCREMENT);
 179
 180   return(Status);
 181 }
 182
 183
 184 NTSTATUS NTAPI
 185 NtfsFsdWrite(PDEVICE_OBJECT DeviceObject,
 186           PIRP Irp)
 187 {
 188   DPRINT("NtfwWrite(DeviceObject %x Irp %x)\n",DeviceObject,Irp);
 189
 190   Irp->IoStatus.Status = STATUS_NOT_SUPPORTED;
 191   Irp->IoStatus.Information = 0;
 192   return(STATUS_NOT_SUPPORTED);
 193 }
 194
 195 /* EOF */