On Tue, 2009-05-05 at 12:23 -0700, Christian Kujau wrote:
> Hi,
> 
> I could not find this anywhere else reported, so here we go:
> creating a new btrfs filesystem (btrfs-progs-unstable from git) and 
> mounting it succeeds, unmounting however fails with the kernel messages 
> attached to this mail. After that, I can still read and write to the 
> btrfs mount, but e.g. /bin/sync never finishes, sysrq-s never reports 
> "Sync complete".
> 
> I'm using a vanilla kernel, yesterday's git version 
> and I *think* I remember having creating btrfs filesystems before (2.6.29, 
> IIRC) and being able to umount them without problems. But I don't know for 
> sure...yet.

Somehow xen is turning a barrier request into an IO error.  That's
really quite strange, but you can mount -o nobarrier.

-chris



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