mirror of
https://github.com/reactos/reactos.git
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269 lines
7.8 KiB
C
269 lines
7.8 KiB
C
/*
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* ReactOS kernel
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* Copyright (C) 2002, 2014 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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* PROGRAMMERS: Art Yerkes
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* Pierre Schweitzer (pierre@reactos.org)
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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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/* 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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NTSTATUS Status = STATUS_SUCCESS;
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PNTFS_FCB Fcb;
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PFILE_RECORD_HEADER FileRecord;
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PNTFS_ATTR_CONTEXT DataContext;
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ULONG RealLength;
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ULONG RealReadOffset;
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ULONG RealLengthRead;
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ULONG ToRead;
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BOOLEAN AllocatedBuffer = FALSE;
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PCHAR ReadBuffer = (PCHAR)Buffer;
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ULONGLONG StreamSize;
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DPRINT1("NtfsReadFile(%p, %p, %p, %u, %u, %x, %p)\n", DeviceExt, FileObject, Buffer, Length, ReadOffset, IrpFlags, LengthRead);
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*LengthRead = 0;
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if (Length == 0)
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{
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DPRINT1("Null read!\n");
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return STATUS_SUCCESS;
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}
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Fcb = (PNTFS_FCB)FileObject->FsContext;
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if (NtfsFCBIsCompressed(Fcb))
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{
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DPRINT1("Compressed file!\n");
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UNIMPLEMENTED;
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return STATUS_NOT_IMPLEMENTED;
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}
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FileRecord = ExAllocatePoolWithTag(NonPagedPool, DeviceExt->NtfsInfo.BytesPerFileRecord, TAG_NTFS);
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if (FileRecord == NULL)
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{
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DPRINT1("Not enough memory!\n");
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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Status = ReadFileRecord(DeviceExt, Fcb->MFTIndex, FileRecord);
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if (!NT_SUCCESS(Status))
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{
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DPRINT1("Can't find record!\n");
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ExFreePoolWithTag(FileRecord, TAG_NTFS);
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return Status;
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}
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Status = FindAttribute(DeviceExt, FileRecord, AttributeData, Fcb->Stream, wcslen(Fcb->Stream), &DataContext);
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if (!NT_SUCCESS(Status))
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{
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NTSTATUS BrowseStatus;
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FIND_ATTR_CONTXT Context;
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PNTFS_ATTR_RECORD Attribute;
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DPRINT1("No '%S' data stream associated with file!\n", Fcb->Stream);
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BrowseStatus = FindFirstAttribute(&Context, DeviceExt, FileRecord, FALSE, &Attribute);
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while (NT_SUCCESS(BrowseStatus))
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{
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if (Attribute->Type == AttributeData)
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{
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UNICODE_STRING Name;
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Name.Length = Attribute->NameLength * sizeof(WCHAR);
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Name.MaximumLength = Name.Length;
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Name.Buffer = (PWCHAR)((ULONG_PTR)Attribute + Attribute->NameOffset);
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DPRINT1("Data stream: '%wZ' available\n", &Name);
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}
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BrowseStatus = FindNextAttribute(&Context, &Attribute);
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}
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FindCloseAttribute(&Context);
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ReleaseAttributeContext(DataContext);
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ExFreePoolWithTag(FileRecord, TAG_NTFS);
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return Status;
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}
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StreamSize = AttributeDataLength(&DataContext->Record);
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if (ReadOffset >= StreamSize)
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{
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DPRINT1("Reading beyond stream end!\n");
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ReleaseAttributeContext(DataContext);
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ExFreePoolWithTag(FileRecord, TAG_NTFS);
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return STATUS_END_OF_FILE;
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}
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ToRead = Length;
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if (ReadOffset + Length > StreamSize)
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ToRead = StreamSize - ReadOffset;
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RealReadOffset = ReadOffset;
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RealLength = ToRead;
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if ((ReadOffset % DeviceExt->NtfsInfo.BytesPerSector) != 0 || (ToRead % DeviceExt->NtfsInfo.BytesPerSector) != 0)
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{
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RealReadOffset = ROUND_DOWN(ReadOffset, DeviceExt->NtfsInfo.BytesPerSector);
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RealLength = ROUND_UP(ToRead, DeviceExt->NtfsInfo.BytesPerSector);
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/* do we need to extend RealLength by one sector? */
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if (RealLength + RealReadOffset < ReadOffset + Length)
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{
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if (RealReadOffset + RealLength + DeviceExt->NtfsInfo.BytesPerSector <= AttributeAllocatedLength(&DataContext->Record))
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RealLength += DeviceExt->NtfsInfo.BytesPerSector;
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}
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ReadBuffer = ExAllocatePoolWithTag(NonPagedPool, RealLength, TAG_NTFS);
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if (ReadBuffer == NULL)
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{
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DPRINT1("Not enough memory!\n");
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ReleaseAttributeContext(DataContext);
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ExFreePoolWithTag(FileRecord, TAG_NTFS);
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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AllocatedBuffer = TRUE;
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}
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DPRINT1("Effective read: %lu at %lu for stream '%S'\n", RealLength, RealReadOffset, Fcb->Stream);
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RealLengthRead = ReadAttribute(DeviceExt, DataContext, RealReadOffset, (PCHAR)ReadBuffer, RealLength);
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if (RealLengthRead == 0)
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{
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DPRINT1("Read failure!\n");
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ReleaseAttributeContext(DataContext);
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ExFreePoolWithTag(FileRecord, TAG_NTFS);
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if (AllocatedBuffer)
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{
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ExFreePoolWithTag(ReadBuffer, TAG_NTFS);
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}
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return Status;
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}
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ReleaseAttributeContext(DataContext);
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ExFreePoolWithTag(FileRecord, TAG_NTFS);
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*LengthRead = ToRead;
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DPRINT1("%lu got read\n", *LengthRead);
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if (AllocatedBuffer)
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{
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RtlCopyMemory(Buffer, ReadBuffer + (ReadOffset - RealReadOffset), ToRead);
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}
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if (ToRead != Length)
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{
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RtlZeroMemory(Buffer + ToRead, Length - ToRead);
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}
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if (AllocatedBuffer)
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{
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ExFreePoolWithTag(ReadBuffer, TAG_NTFS);
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}
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return STATUS_SUCCESS;
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}
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NTSTATUS
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NtfsRead(PNTFS_IRP_CONTEXT IrpContext)
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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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PIRP Irp;
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PDEVICE_OBJECT DeviceObject;
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DPRINT("NtfsRead(IrpContext %p)\n", IrpContext);
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DeviceObject = IrpContext->DeviceObject;
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Irp = IrpContext->Irp;
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Stack = IrpContext->Stack;
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FileObject = IrpContext->FileObject;
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DeviceExt = DeviceObject->DeviceExtension;
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ReadLength = Stack->Parameters.Read.Length;
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ReadOffset = Stack->Parameters.Read.ByteOffset;
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Buffer = NtfsGetUserBuffer(Irp, BooleanFlagOn(Irp->Flags, IRP_PAGING_IO));
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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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return Status;
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}
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NTSTATUS
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NtfsWrite(PNTFS_IRP_CONTEXT IrpContext)
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{
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DPRINT("NtfsWrite(IrpContext %p)\n",IrpContext);
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IrpContext->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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