* BBufferIO did not implement Seek() and Position() correctly; it just passed

it to the stream. This caused Read()/Write() to need two syscalls for nothing
  (this only caused the actual stream to share the same position with the
  BBufferIO, something you just cannot rely on when using buffered I/O).
* Anyway, this reduces the time VirtualBox needs to open some RAW test images
  from over 4 minutes to less than 15 seconds...


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28662 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/support/BufferIO.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2007, Haiku, Inc. All Rights Reserved.
+ * Copyright 2007-2008, Haiku, Inc. All Rights Reserved.
  * Distributed under the terms of the MIT License.
  */
 #ifndef _BUFFER_IO_H
@@ -40,7 +40,8 @@ class BBufferIO : public BPositionIO {
 		char* fBuffer;
 		size_t fBufferSize;
 		size_t fBufferUsed;
-		uint32 _reserved_ints[6];
+		off_t fPosition;
+		uint32 _reserved_ints[4];
 		bool fBufferIsDirty;
 		bool fOwnsStream;
 		bool _reserved_bools[6];