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Check if a uncached read is sector aligned, fail if is not.

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svn path=/trunk/; revision=3915
This commit is contained in:
Hartmut Birr 2003-01-02 16:02:02 +00:00
parent 5d8ab9ff70
commit f9725d0888
1 changed files with 18 additions and 57 deletions
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75
reactos/drivers/fs/cdfs/rw.c
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@ -16,7 +16,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* $Id: rw.c,v 1.8 2002/11/20 21:55:25 ekohl Exp $
/* $Id: rw.c,v 1.9 2003/01/02 16:02:02 hbirr Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
@ -76,19 +76,15 @@ CdfsReadFile(PDEVICE_EXTENSION DeviceExt,
if (ReadOffset >= Fcb->Entry.DataLengthL)
return(STATUS_END_OF_FILE);
if (ReadOffset + Length > Fcb->Entry.DataLengthL)
Length = Fcb->Entry.DataLengthL - ReadOffset;
DPRINT("Reading %d bytes at %d\n", Length, ReadOffset);
if (Length == 0)
return(STATUS_UNSUCCESSFUL);
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, &Fcb->RFCB.Bcb, PAGE_SIZE);
@ -106,60 +102,25 @@ CdfsReadFile(PDEVICE_EXTENSION DeviceExt,
return(IoStatus.Status);
}
if ((ReadOffset % BLOCKSIZE) != 0)
if ((ReadOffset % BLOCKSIZE) != 0 || (Length % BLOCKSIZE) != 0)
{
TempLength = min(Length, BLOCKSIZE - (ReadOffset % BLOCKSIZE));
TempBuffer = ExAllocatePool(NonPagedPool, BLOCKSIZE);
Status = CdfsReadSectors(DeviceExt->StorageDevice,
Fcb->Entry.ExtentLocationL + (ReadOffset / BLOCKSIZE),
1,
TempBuffer);
if (NT_SUCCESS(Status))
{
memcpy(Buffer, TempBuffer + (ReadOffset % BLOCKSIZE), TempLength);
(*LengthRead) = (*LengthRead) + TempLength;
Length = Length - TempLength;
Buffer = Buffer + TempLength;
ReadOffset = ReadOffset + TempLength;
}
ExFreePool(TempBuffer);
return STATUS_INVALID_PARAMETER;
}
if (ReadOffset + Length > ROUND_UP(Fcb->Entry.DataLengthL, BLOCKSIZE))
Length = ROUND_UP(Fcb->Entry.DataLengthL, BLOCKSIZE) - ReadOffset;
DPRINT("Status %lx\n", Status);
if ((Length / BLOCKSIZE) != 0 && NT_SUCCESS(Status))
Status = CdfsReadSectors(DeviceExt->StorageDevice,
Fcb->Entry.ExtentLocationL + (ReadOffset / BLOCKSIZE),
Length / BLOCKSIZE,
Buffer);
if (NT_SUCCESS(Status))
{
TempLength = ROUND_DOWN(Length, BLOCKSIZE);
Status = CdfsReadSectors(DeviceExt->StorageDevice,
Fcb->Entry.ExtentLocationL + (ReadOffset / BLOCKSIZE),
TempLength / BLOCKSIZE,
Buffer);
if (NT_SUCCESS(Status))
{
(*LengthRead) = (*LengthRead) + TempLength;
Length = Length - TempLength;
Buffer = Buffer + TempLength;
ReadOffset = ReadOffset + TempLength;
}
}
DPRINT("Status %lx\n", Status);
if (Length > 0 && NT_SUCCESS(Status))
{
TempBuffer = ExAllocatePool(NonPagedPool, BLOCKSIZE);
Status = CdfsReadSectors(DeviceExt->StorageDevice,
Fcb->Entry.ExtentLocationL + (ReadOffset / BLOCKSIZE),
1,
TempBuffer);
if (NT_SUCCESS(Status))
{
memcpy(Buffer, TempBuffer, Length);
(*LengthRead) = (*LengthRead) + Length;
}
ExFreePool(TempBuffer);
*LengthRead = Length;
if (Length + ReadOffset > Fcb->Entry.DataLengthL)
{
memset(Buffer + Fcb->Entry.DataLengthL - ReadOffset,
0, Length + ReadOffset - Fcb->Entry.DataLengthL);
}
}
return(Status);