Re: The magical shrinking image (was Re: [coLinux-devel] Failed startup on XP Home Edition SP1a)

[Dan A. <da...@gm...>]

On Sat, Jan 31, 2004 at 04:55:57PM -0500, Matt Behrens wrote:
> Okay, it seems there are worse problems than just misreporting the
> size in cobd.
> 
> It seems in e2fslibs that the size is actually determined by an
> algorithm I can't get my weekend brain around, but it does a lot
> of seeking and trying to read a byte to get the "real" size.
> 
> Armed with this idea I tried to dd if=/dev/cobd0 of=/dev/null bs=1k
> count=128k (using my 128M image).  I got a stream of I/O errors
> near the end and DebugView is filled with several messages starting
> with "block io failed: edbb6000 400 (reason: c0000011)".  Goes up
> to edea6c00.

c0000011 is STATUS_END_OF_FILE.

It is possible that reading cobd devices from userspace is broken. 
Prehaps in that scenario offsets are passed from Linux to Windows 
wrongly. 

> I can't find the above DebugView message anywhere in the 0.5.2
> colinux source I pulled today.

It's in colinux/os/winnt/kernel/block.c.

-- 
Dan Aloni
da...@gm...