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![Amine Khaldi](/assets/img/avatar_default.png)
* Create a branch for some evul shell experiments. svn path=/branches/shell-experiments/; revision=61927
202 lines
5.3 KiB
C
202 lines
5.3 KiB
C
/*
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* ReactOS kernel
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* Copyright (C) 2002 ReactOS Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* FILE: drivers/filesystem/ntfs/rw.c
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* PURPOSE: NTFS filesystem driver
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* PROGRAMMER: Art Yerkes
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* UPDATE HISTORY:
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*/
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/* INCLUDES *****************************************************************/
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#include <ntddk.h>
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#include "ntfs.h"
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#define NDEBUG
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#include <debug.h>
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/* GLOBALS *******************************************************************/
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#define ROUND_UP(N, S) ((((N) + (S) - 1) / (S)) * (S))
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#define ROUND_DOWN(N, S) ((N) - ((N) % (S)))
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/* FUNCTIONS ****************************************************************/
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/*
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* FUNCTION: Reads data from a file
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*/
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static
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NTSTATUS
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NtfsReadFile(PDEVICE_EXTENSION DeviceExt,
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PFILE_OBJECT FileObject,
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PUCHAR Buffer,
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ULONG Length,
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ULONG ReadOffset,
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ULONG IrpFlags,
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PULONG LengthRead)
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{
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#if 0
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NTSTATUS Status = STATUS_SUCCESS;
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PUCHAR TempBuffer;
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ULONG TempLength;
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PCCB Ccb;
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PFCB Fcb;
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DPRINT("CdfsReadFile(ReadOffset %lu Length %lu)\n", ReadOffset, Length);
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*LengthRead = 0;
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if (Length == 0)
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return(STATUS_SUCCESS);
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Ccb = (PCCB)FileObject->FsContext2;
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Fcb = (PFCB)FileObject->FsContext;
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if (ReadOffset >= Fcb->Entry.DataLengthL)
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return(STATUS_END_OF_FILE);
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DPRINT("Reading %d bytes at %d\n", Length, ReadOffset);
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if (!(IrpFlags & (IRP_NOCACHE|IRP_PAGING_IO)))
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{
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LARGE_INTEGER FileOffset;
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IO_STATUS_BLOCK IoStatus;
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if (ReadOffset + Length > Fcb->Entry.DataLengthL)
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Length = Fcb->Entry.DataLengthL - ReadOffset;
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if (FileObject->PrivateCacheMap == NULL)
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{
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CcRosInitializeFileCache(FileObject, PAGE_SIZE);
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}
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FileOffset.QuadPart = (LONGLONG)ReadOffset;
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CcCopyRead(FileObject,
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&FileOffset,
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Length,
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TRUE,
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Buffer,
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&IoStatus);
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*LengthRead = IoStatus.Information;
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return(IoStatus.Status);
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}
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if ((ReadOffset % BLOCKSIZE) != 0 || (Length % BLOCKSIZE) != 0)
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{
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return STATUS_INVALID_PARAMETER;
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}
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if (ReadOffset + Length > ROUND_UP(Fcb->Entry.DataLengthL, BLOCKSIZE))
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Length = ROUND_UP(Fcb->Entry.DataLengthL, BLOCKSIZE) - ReadOffset;
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Status = CdfsReadSectors(DeviceExt->StorageDevice,
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Fcb->Entry.ExtentLocationL + (ReadOffset / BLOCKSIZE),
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Length / BLOCKSIZE,
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Buffer);
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if (NT_SUCCESS(Status))
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{
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*LengthRead = Length;
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if (Length + ReadOffset > Fcb->Entry.DataLengthL)
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{
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memset(Buffer + Fcb->Entry.DataLengthL - ReadOffset,
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0, Length + ReadOffset - Fcb->Entry.DataLengthL);
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}
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}
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return(Status);
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#else
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UNREFERENCED_PARAMETER(DeviceExt);
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UNREFERENCED_PARAMETER(FileObject);
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UNREFERENCED_PARAMETER(Buffer);
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UNREFERENCED_PARAMETER(Length);
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UNREFERENCED_PARAMETER(ReadOffset);
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UNREFERENCED_PARAMETER(IrpFlags);
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*LengthRead = 0;
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return STATUS_END_OF_FILE;
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#endif
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}
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NTSTATUS
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NTAPI
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NtfsFsdRead(PDEVICE_OBJECT DeviceObject,
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PIRP Irp)
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{
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PDEVICE_EXTENSION DeviceExt;
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PIO_STACK_LOCATION Stack;
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PFILE_OBJECT FileObject;
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PVOID Buffer;
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ULONG ReadLength;
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LARGE_INTEGER ReadOffset;
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ULONG ReturnedReadLength = 0;
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NTSTATUS Status = STATUS_SUCCESS;
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DPRINT("NtfsRead(DeviceObject %x, Irp %x)\n",DeviceObject,Irp);
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DeviceExt = DeviceObject->DeviceExtension;
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Stack = IoGetCurrentIrpStackLocation(Irp);
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FileObject = Stack->FileObject;
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ReadLength = Stack->Parameters.Read.Length;
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ReadOffset = Stack->Parameters.Read.ByteOffset;
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Buffer = MmGetSystemAddressForMdl(Irp->MdlAddress);
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Status = NtfsReadFile(DeviceExt,
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FileObject,
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Buffer,
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ReadLength,
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ReadOffset.u.LowPart,
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Irp->Flags,
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&ReturnedReadLength);
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if (NT_SUCCESS(Status))
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{
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if (FileObject->Flags & FO_SYNCHRONOUS_IO)
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{
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FileObject->CurrentByteOffset.QuadPart =
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ReadOffset.QuadPart + ReturnedReadLength;
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}
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Irp->IoStatus.Information = ReturnedReadLength;
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}
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else
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{
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Irp->IoStatus.Information = 0;
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}
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Irp->IoStatus.Status = Status;
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IoCompleteRequest(Irp,IO_NO_INCREMENT);
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return Status;
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}
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NTSTATUS
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NTAPI
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NtfsFsdWrite(PDEVICE_OBJECT DeviceObject,
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PIRP Irp)
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{
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DPRINT("NtfwWrite(DeviceObject %x Irp %x)\n",DeviceObject,Irp);
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Irp->IoStatus.Status = STATUS_NOT_SUPPORTED;
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Irp->IoStatus.Information = 0;
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return STATUS_NOT_SUPPORTED;
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}
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/* EOF */
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