Bug#402710: Loop mount of XFS on DVD-RW fails on Debian, works on SUSE

[Moritz Muehlenhoff <jmm@inutil.org>]

On Sun, Mar 18, 2007 at 12:03:45PM +0100, Max Vozeler wrote:
> reassign 402710 linux-2.6
> retitle 402710 Loop mount of XFS on DVD-RW fails on Debian, works on SUSE
> thanks
> 
> Hi kernel team, hi Kosza,
> 
> This bug is about a problem Kosza experienced when trying to loop
> mount an XFS filesystem stored on DVD-RW. This works correctly on
> SUSE 10.0 but fails on Debian 2.6.17-2. Summarizing what I think
> we have found out so far:
> 
>  - DVD has a fixed block size of 2048 bytes
>  - mkfs.xfs created a filesystem with block size of 4096 bytes
>  - Debian kernel (2.6.17) is unable to loop mount it from the DVD
>  - SUSE 10.0 kernel (2.6.13 ?) is able to loop mount it
>  - Encryption makes no difference
> 
> This suggests that an unknown difference exists between the SUSE
> and Debian kernels. I'm not sure where to start looking for this;
> perhaps someone on the kernel team can suggest how to continue.
> 
> If my understanding of the problem is correct, you should be able
> to work around this problem by telling mkfs.xfs to create the
> filesystem with a block size that matches the block size of the
> DVD (something like mkfs.xfs -b 2048 /dev/loop0).

Kosza, does this error still occur with more recent kernel versions?

Cheers,
        Moritz