interesting MD-xfs bug

[Dave Chinner]

On Thu, Apr 09, 2015 at 06:20:26PM -0400, Joe Landman wrote:
> 
> 
> On 04/09/2015 06:18 PM, Dave Chinner wrote:
> >On Thu, Apr 09, 2015 at 05:02:33PM -0400, Joe Landman wrote:
> >>If I build an MD raid0 with a non power of 2 chunk size, it appears
> >>that I can mkfs.xfs a file system, but it doesn't show up in blkid
> >>and is not mountable.  Yet, using a power of 2 chunk size, this does
> >>work correctly.   This is kernel 3.18.9.
> >>
> 
> [...]
> 
> >That looks more like a blkid or udev problem. try using blkid -p so
> >that it doesn't look up the cache but directly probes devices for
> >the signatures. strace might tell you a bit more, too. And if the
> >filesystem mounts, then it definitely isn't an XFS problem ;)
> 
> Thats the thing, it didn't mount, even when I used the device name
> directly.

Ok, that's interesting. Let me see if I can reproduce it locally. If
you don't hear otherwise, tracing would still be useful. Thanks for
the bug report, Joe.

Cheers,

Dave.
-- 
Dave Chinner
david at fromorbit.com