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[NTFS]

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Quickly implement NtfsReadFile().

By quickly, I mean that it works but is under optimal in many ways, and also doesn't support any caching. So, don't expect breaking performances.

BUUUUUUT... This implements reading a file on a NTFS volume on ReactOS! And it works!
Here is a picture of all the achievements of ReactOS with NTFS lately: http://www.heisspiter.net/~Pierre/rostests/NTFS_all.png
-> Volume information
-> Displaying files in explorer
-> Moving across directories
-> Reading a file (with more here)

That's all folks! (for now ;-))

svn path=/trunk/; revision=65192
This commit is contained in:
Pierre Schweitzer 2014-11-02 19:55:22 +00:00
parent 6ea5fe3e43
commit ffa40006ae
1 changed files with 107 additions and 75 deletions
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182
reactos/drivers/filesystems/ntfs/rw.c
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@ -52,84 +52,116 @@ NtfsReadFile(PDEVICE_EXTENSION DeviceExt,
ULONG IrpFlags,
PULONG LengthRead)
{
#if 0
NTSTATUS Status = STATUS_SUCCESS;
PUCHAR TempBuffer;
ULONG TempLength;
PCCB Ccb;
PFCB Fcb;
NTSTATUS Status = STATUS_SUCCESS;
PNTFS_FCB Fcb;
PFILE_RECORD_HEADER FileRecord;
PNTFS_ATTR_CONTEXT DataContext;
ULONG RealLength;
ULONG RealReadOffset;
ULONG RealLengthRead;
ULONG ToRead;
BOOLEAN AllocatedBuffer = FALSE;
PCHAR ReadBuffer = (PCHAR)Buffer;
DPRINT("CdfsReadFile(ReadOffset %lu Length %lu)\n", ReadOffset, Length);
DPRINT1("NtfsReadFile(%p, %p, %p, %u, %u, %x, %p)\n", DeviceExt, FileObject, Buffer, Length, ReadOffset, IrpFlags, LengthRead);
*LengthRead = 0;
if (Length == 0)
return(STATUS_SUCCESS);
Ccb = (PCCB)FileObject->FsContext2;
Fcb = (PFCB)FileObject->FsContext;
if (ReadOffset >= Fcb->Entry.DataLengthL)
return(STATUS_END_OF_FILE);
DPRINT("Reading %d bytes at %d\n", Length, ReadOffset);
if (!(IrpFlags & (IRP_NOCACHE|IRP_PAGING_IO)))
{
LARGE_INTEGER FileOffset;
IO_STATUS_BLOCK IoStatus;
if (ReadOffset + Length > Fcb->Entry.DataLengthL)
Length = Fcb->Entry.DataLengthL - ReadOffset;
if (FileObject->PrivateCacheMap == NULL)
{
CcRosInitializeFileCache(FileObject, PAGE_SIZE);
}
FileOffset.QuadPart = (LONGLONG)ReadOffset;
CcCopyRead(FileObject,
&FileOffset,
Length,
TRUE,
Buffer,
&IoStatus);
*LengthRead = IoStatus.Information;
return(IoStatus.Status);
}
if ((ReadOffset % BLOCKSIZE) != 0 || (Length % BLOCKSIZE) != 0)
{
return STATUS_INVALID_PARAMETER;
}
if (ReadOffset + Length > ROUND_UP(Fcb->Entry.DataLengthL, BLOCKSIZE))
Length = ROUND_UP(Fcb->Entry.DataLengthL, BLOCKSIZE) - ReadOffset;
Status = CdfsReadSectors(DeviceExt->StorageDevice,
Fcb->Entry.ExtentLocationL + (ReadOffset / BLOCKSIZE),
Length / BLOCKSIZE,
Buffer);
if (NT_SUCCESS(Status))
{
*LengthRead = Length;
if (Length + ReadOffset > Fcb->Entry.DataLengthL)
{
memset(Buffer + Fcb->Entry.DataLengthL - ReadOffset,
0, Length + ReadOffset - Fcb->Entry.DataLengthL);
}
}
return(Status);
#else
UNREFERENCED_PARAMETER(DeviceExt);
UNREFERENCED_PARAMETER(FileObject);
UNREFERENCED_PARAMETER(Buffer);
UNREFERENCED_PARAMETER(Length);
UNREFERENCED_PARAMETER(ReadOffset);
UNREFERENCED_PARAMETER(IrpFlags);
*LengthRead = 0;
return STATUS_END_OF_FILE;
#endif
if (Length == 0)
{
DPRINT1("Null read!\n");
return STATUS_SUCCESS;
}
Fcb = (PNTFS_FCB)FileObject->FsContext;
if (ReadOffset >= Fcb->Entry.AllocatedSize)
{
DPRINT1("Reading beyond file end!\n");
return STATUS_END_OF_FILE;
}
ToRead = Length;
if (ReadOffset + Length > Fcb->Entry.AllocatedSize)
ToRead = Fcb->Entry.AllocatedSize - ReadOffset;
RealReadOffset = ReadOffset;
RealLength = ToRead;
if ((ReadOffset % DeviceExt->NtfsInfo.BytesPerSector) != 0 || (ToRead % DeviceExt->NtfsInfo.BytesPerSector) != 0)
{
RealReadOffset = ROUND_DOWN(ReadOffset, DeviceExt->NtfsInfo.BytesPerSector);
RealLength = ROUND_UP(ToRead, DeviceExt->NtfsInfo.BytesPerSector);
ReadBuffer = ExAllocatePoolWithTag(NonPagedPool, RealLength + DeviceExt->NtfsInfo.BytesPerSector, TAG_NTFS);
if (ReadBuffer == NULL)
{
DPRINT1("Not enough memory!\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
AllocatedBuffer = TRUE;
}
FileRecord = ExAllocatePoolWithTag(NonPagedPool, DeviceExt->NtfsInfo.BytesPerFileRecord, TAG_NTFS);
if (FileRecord == NULL)
{
DPRINT1("Not enough memory!\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
Status = ReadFileRecord(DeviceExt, Fcb->MFTIndex, FileRecord);
if (!NT_SUCCESS(Status))
{
DPRINT1("Can't find record!\n");
ExFreePoolWithTag(FileRecord, TAG_NTFS);
return Status;
}
Status = FindAttribute(DeviceExt, FileRecord, AttributeData, L"", 0, &DataContext);
if (!NT_SUCCESS(Status))
{
DPRINT1("No data associated with file!\n");
ExFreePoolWithTag(FileRecord, TAG_NTFS);
return Status;
}
DPRINT1("Effective read: %lu at %lu\n", RealLength, RealReadOffset);
RealLengthRead = ReadAttribute(DeviceExt, DataContext, RealReadOffset, (PCHAR)ReadBuffer, RealLength);
if (RealLengthRead != RealLength)
{
DPRINT1("Read failure!\n");
ReleaseAttributeContext(DataContext);
ExFreePoolWithTag(FileRecord, TAG_NTFS);
if (AllocatedBuffer)
{
ExFreePoolWithTag(ReadBuffer, TAG_NTFS);
}
return Status;
}
ReleaseAttributeContext(DataContext);
ExFreePoolWithTag(FileRecord, TAG_NTFS);
*LengthRead = ToRead;
DPRINT1("%lu got read\n", *LengthRead);
if (AllocatedBuffer)
{
RtlCopyMemory(Buffer, ReadBuffer + (ReadOffset - RealReadOffset), ToRead);
}
if (ToRead != Length)
{
RtlZeroMemory(Buffer + ToRead, Length - ToRead);
}
if (AllocatedBuffer)
{
ExFreePoolWithTag(ReadBuffer, TAG_NTFS);
}
return STATUS_SUCCESS;
}