[Parted-maintainers] Bug#380226: libparted does not resize NTFS

[Frans Pop]

On Monday 22 January 2007 23:14, David Cantrell wrote:
> Apologies for it taking so long.  The GNU parted team has shifted
> around a bit in the past year or so.

That happens :-(

> When resizing a Vista NTFS partition, be sure to start at sector 2048.
> In the parted(8) interactive program, this can be done by specifying
> 1049kB as the starting location. 

Sure, but as I explained, we do not use parted, but our own program 
partman, which only makes use of _lib_parted.

What we actually do in parted_server is to call the libparted function 
ped_disk_set_partition_geom with:
- disk: correct PedDisk
- part: correct PedPartition
- constraint: ped_file_system_get_resize_constraint(fs)
- start: 2048
- end: 29298922 (for example)

> Now, I have made a patch for parted-1.8.2 that will preserve the
> starting sector of 2048 on Vista partitions when you are creating the
> DOS disklabel.  That should be added to the parted package in Debian
> for this to work.

Do you mean the patch "parted-print-name.dpatch" that Otavio already 
applied in Debian's parted last week? I tested with that patch, but that 
actually caused a serious regression.

It no longer changes the starting sector to 63, but also does not fix the 
problem (i.e. leaving the starting sector at 2048); instead the starting 
sector is now being changed to 16065, which I suspect is the end of the 
first cylinder or the start of the second! See [1].

This probably is worse than the old behavior and I've therefore suggested 
to Otavio to revert that patch.

From my reading of the relevant code (libparted/labels/dos.c) in libparted 
[2], I think that your change is in the right area, but that the current 
fix is doing something wrong.

Cheers,
FJP

[1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=380226;msg=210
[2] I'm not a C programmer, but I've seen enough languages to be able to
    make some sense of most.
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